[dev.boringcrypto] all: merge master (2f0da6d) into dev.boringcrypto

Manual edits in src/cmd/compile/internal/reflectdata/reflect.go
to keep build working.

Merge List:

+ 2021-02-17 2f0da6d9e2 go/types: revert "no 'declared but not used' errors for invalid var decls"
+ 2021-02-17 70c37ee7d0 cmd/compile/internal/test: gofmt abiutils_test.go
+ 2021-02-16 84825599dc all: merge branch dev.regabi (d3cd4830ad) into master
+ 2021-02-16 d3cd4830ad [dev.regabi] test: run abi/regabipragma test with -c=1
+ 2021-02-16 03cea563d1 [dev.regabi] all: merge master (5faf941) into dev.regabi
+ 2021-02-16 b8fb049c7a [dev.regabi] cmd/go: copy internal/abi in TestNewReleaseRebuildsStalePackagesInGOPATH
+ 2021-02-16 5faf941df0 internal/goversion: update Version to 1.17
+ 2021-02-16 ed55da46ab [dev.regabi] go/types: overlapping embedded interfaces requires go1.14
+ 2021-02-16 7696c94334 [dev.regabi] go/types: type alias decl requires go1.9
+ 2021-02-16 c2358a1ae7 [dev.regabi] runtime: stub out spillArgs and unspillArgs
+ 2021-02-16 8cfbf34dd9 internal/abi: set register count constants to zero for regabi experiment
+ 2021-02-16 6f3da9d2f6 README: pull gopher image from website
+ 2021-02-16 d28aae26b0 [dev.regabi] cmd/link: recognize internal/abi as runtime package
+ 2021-02-16 098504c73f cmd/link: generate trampoline for inter-dependent packages
+ 2021-02-16 1004a7cb31 runtime/metrics: update documentation to current interface
+ 2021-02-16 6530f2617f doc/go1.16: remove draft notice
+ 2021-02-16 353e111455 doc/go1.16: fix mismatched id attribute
+ 2021-02-16 e0215315f5 [dev.regabi] reflect: support for register ABI on amd64 for reflect.(Value).Call
+ 2021-02-16 f0d23c9dbb internal/poll: netpollcheckerr before sendfile
+ 2021-02-16 0cb3415154 doc: remove all docs not tied to distribution
+ 2021-02-16 626ef08127 doc: remove install.html and install-source.html
+ 2021-02-16 30641e36aa internal/poll: if copy_file_range returns 0, assume it failed
+ 2021-02-15 33d72fd412 doc/faq: update generics entry to reflect accepted proposal
+ 2021-02-15 852ce7c212 cmd/go: provide a more helpful suggestion for "go vet -?"
+ 2021-02-13 66c27093d0 cmd/link: fix typo in link_test.go
+ 2021-02-13 b81efb7ec4 [dev.regabi] go/types: add support for language version checking
+ 2021-02-13 a7e9b4b948 [dev.regabi] go/types: untyped shift counts must fit into uint
+ 2021-02-13 060fa49bd2 [dev.regabi] go/types: refuse excessively long constants
+ 2021-02-12 baa6c75dce [dev.regabi] internal/abi: add new internal/abi package for ABI constants
+ 2021-02-12 d1fd9a8863 [dev.regabi] all: merge master (ff0e93e) into dev.regabi
+ 2021-02-12 ff0e93ea31 doc/go1.16: note that package path elements beginning with '.' are disallowed
+ 2021-02-11 249da7ec02 CONTRIBUTORS: update for the Go 1.16 release
+ 2021-02-11 864d4f1c6b cmd/go: multiple small 'go help' fixes
+ 2021-02-11 26ceae85a8 spec: More precise wording in section on function calls.
+ 2021-02-11 930c2c9a68 cmd/go: reject embedded files that can't be packed into modules
+ 2021-02-11 e5b08e6d5c io/fs: allow backslash in ValidPath, reject in os.DirFS.Open
+ 2021-02-10 ed8079096f cmd/compile: mark concrete call of reflect.(*rtype).Method as REFLECTMETHOD
+ 2021-02-10 59703d53e2 [dev.regabi] cmd/link: stop using ABI aliases if wrapper is enabled
+ 2021-02-09 e9c9683597 cmd/go: suppress errors from 'go get -d' for packages that only conditionally exist
+ 2021-02-09 168d6a49a5 [dev.regabi] go/types: use 512 bits as max. integer precision
+ 2021-02-09 0a62067708 [dev.regabi] go/types: adjust importer to match compiler importer
+ 2021-02-09 1c58fcf7ed [dev.regabi] go/types: handle untyped constant arithmetic overflow
+ 2021-02-09 493363ccff [dev.regabi] go/types: must not import a package called "init"
+ 2021-02-09 e0ac989cf3 archive/tar: detect out of bounds accesses in PAX records resulting from padded lengths
+ 2021-02-09 c48d1503ba [dev.regabi] go/types: report unused packages in source order
+ 2021-02-09 813958f13c [dev.regabi] go/types: factor out sorting of methods
+ 2021-02-09 11d15c171b [dev.regabi] go/types: convert untyped arguments to delete
+ 2021-02-09 c9d6f45fec runtime/metrics: fix a couple of documentation typpos
+ 2021-02-09 cea4e21b52 io/fs: backslash is always a glob meta character
+ 2021-02-08 dc725bfb3c doc/go1.16: mention new vet check for asn1.Unmarshal
+ 2021-02-08 618e3c15bd [dev.regabi] go/types: consistently report nil type as "untyped nil"
+ 2021-02-08 50449de66a [dev.regabi] all: merge master (1901853) into dev.regabi
+ 2021-02-08 7b0dfb177f [dev.regabi] runtime: use g register in some assembly functions on AMD64
+ 2021-02-08 2e60c00f56 [dev.regabi] cmd/internal/obj/x86: use g register in stack bounds check
+ 2021-02-08 22f9e1ccbc [dev.regabi] runtime: initialize special registers before sigpanic
+ 2021-02-08 5d7dc53888 [dev.regabi] cmd/compile, runtime: reserve R14 as g registers on AMD64
+ 2021-02-08 1901853098 runtime/metrics: fix panic in readingAllMetric example
+ 2021-02-08 ed3e4afa12 syscall/plan9: remove spooky fd action at a distance
+ 2021-02-08 a21de9ec73 [dev.regabi] cmd/link: resolve symbol ABI in shared linkage
+ 2021-02-05 724d0720b3 doc/go1.16: add missed heading tag in vet section
+ 2021-02-05 b54cd94d47 embed, io/fs: clarify that leading and trailing slashes are disallowed
+ 2021-02-05 4516afebed testing/fstest: avoid symlink-induced failures in tester
+ 2021-02-05 8fa84772ba [dev.regabi] runtime: delete gosave function
+ 2021-02-05 946351d5a2 [dev.regabi] runtime: zero X15 in racecall
+ 2021-02-05 397a46a10a [dev.regabi] cmd/asm: define g register on AMD64
+ 2021-02-05 e79c2fd428 [dev.regabi] runtime: mark racecallbackthunk as ABIInternal
+ 2021-02-05 7cc6de59f2 [dev.regabi] runtime: don't mark rt0_go ABIInternal
+ 2021-02-05 63de211014 [dev.regabi] runtime/cgo: call setg_gcc in crosscall_amd64
+ 2021-02-04 120b819f45 [dev.regabi] go/types: report error for invalid main function signature
+ 2021-02-04 52d5cb2822 [dev.regabi] cmd/internal/obj: access Attribute atomically
+ 2021-02-04 bc451b5770 [dev.regabi] go/types: port check_test.go ergonomics from dev.typeparams
+ 2021-02-04 afd67f3334 [dev.regabi] go/types: no "declared but not used" errors for invalid var decls
+ 2021-02-04 8869086d8f runtime: fix typo in histogram.go
+ 2021-02-03 401d7e5a24 [dev.regabi] cmd/compile: reserve X15 as zero register on AMD64
+ 2021-02-03 bfc7418e6d [dev.regabi] runtime, syscall, etc.: mark Darwin syscall wrappers as ABIInternal
+ 2021-02-03 e491c6eea9 math/big: fix comment in divRecursiveStep
+ 2021-02-02 23b0c1f76e [dev.regabi] all: merge master (fca94ab) into dev.regabi
+ 2021-02-02 fca94ab3ab spec: improve the example in Type assertions section
+ 2021-02-02 98f8454a73 cmd/link: don't decode type symbol in shared library in deadcode
+ 2021-02-02 1426a571b7 cmd/link: fix off-by-1 error in findShlibSection
+ 2021-02-01 32e789f4fb test: fix incorrectly laid out instructions in issue11656.go
+ 2021-02-01 ca6999e27c [dev.regabi] test: add a test for inlining closures
+ 2021-02-01 0b6cfea634 doc/go1.16: document that on OpenBSD syscalls are now made through libc
+ 2021-02-01 26e29aa15a cmd/link: disable TestPIESize if CGO isn't enabled
+ 2021-02-01 6ac91e460c doc/go1.16: minor markup fixes
+ 2021-01-29 44361140c0 embed: update docs for proposal tweaks
+ 2021-01-29 68058edc39 runtime: document pointer write atomicity for memclrNoHeapPointers
+ 2021-01-28 c8bd8010ff syscall: generate readlen/writelen for openbsd libc
+ 2021-01-28 41bb49b878 cmd/go: revert TestScript/build_trimpath to use ioutil.ReadFile
+ 2021-01-28 725a642c2d runtime: correct syscall10/syscall10X on openbsd/amd64
+ 2021-01-28 4b068cafb5 doc/go1.16: document go/build/constraint package
+ 2021-01-28 376518d77f runtime,syscall: convert syscall on openbsd/arm64 to libc
+ 2021-01-27 aca22bddf2 [dev.regabi] cmd/compile: remove nested functions from expands_calls.go
+ 2021-01-27 667e08ba8c [dev.regabi] cmd/go: Use GOMAXPROCS to limit default build, compile parallelism
+ 2021-01-27 00f2ff5c94 api/go1.16: add go/build/constraint APIs
+ 2021-01-27 35334caf18 crypto/x509: remove leftover CertificateRequest field
+ 2021-01-27 a5a5e2c968 runtime: make sure to remove open-coded defer entries in all cases after a recover
+ 2021-01-27 8cfa01943a runtime: block console ctrlhandler when the signal is handled
+ 2021-01-27 ff9e8364c6 cmd/go: skip issue33139 when the 'cc' script command is unavailable
+ 2021-01-27 cd176b3615 runtime: switch runtime to libc for openbsd/arm64
+ 2021-01-27 6c8fbfbdcf runtime: convert openbsd/arm64 locking to libc
+ 2021-01-27 5cdf0da1bf syscall: clean up mkasm related changes
+ 2021-01-27 210f70e298 doc/go1.16: fix closing brace in .Export format
+ 2021-01-27 0f797f168d math: fix typo in sqrt.go code comment
+ 2021-01-26 9b636feafe [dev.regabi] cmd/compile: missing last patch set for cl286013
+ 2021-01-26 f7dad5eae4 [dev.regabi] cmd/compile: remove leftover code form late call lowering work
+ 2021-01-26 8634a234df runtime,syscall: convert syscall on openbsd/amd64 to libc
+ 2021-01-26 1d5e14632e os: further document limitations around naked file descriptors
+ 2021-01-25 5e4a0cdde3 [dev.regabi] all: merge master (bf0f7c9) into dev.regabi
+ 2021-01-26 cf263e9f77 os: correct names in CreateTemp and MkdirTemp doc comments
+ 2021-01-26 ce8b318624 net/http/fcgi: remove locking added to prevent a test-only race
+ 2021-01-25 bf0f7c9d78 doc/go1.16: mention os.DirFS in os section
+ 2021-01-25 deaf29a8a8 cmd/compile: fix order-of-assignment issue w/ defers
+ 2021-01-25 ad2ca26a52 doc/go1.16: mention os.DirEntry and types moved from os to io/fs
+ 2021-01-25 a51921fa5b doc/go1.16: mention new testing/iotest functions
+ 2021-01-25 e6b6d107f7 doc/go1.16: mention deprecation of io/ioutil
+ 2021-01-25 7eaaf28cae [dev.regabi] cmd/compile: disallow taking address of SSA'd values
+ 2021-01-25 96a276363b doc/go1.16: mention go/build changes
+ 2021-01-25 3d85c69a0b html/template: revert "avoid race when escaping updates template"
+ 2021-01-25 54514c6b28 cmd/go: fix TestScript/cgo_path, cgo_path_space when CC set
+ 2021-01-25 6f5e79f470 [dev.regabi] cmd/compile/internal: specify memory layout
+ 2021-01-25 cabffc199d [dev.regabi] cmd/compile/internal: add internal ABI specification
+ 2021-01-25 6de8443f3b doc/asm: add a section on go_asm.h, clean up go_tls.h section
+ 2021-01-25 6a4739ccc5 [dev.regabi] cmd/compile: enable rational constant arithmetic
+ 2021-01-25 be9612a832 [dev.regabi] os: disable TestDirFS until #42637 is fixed
+ 2021-01-25 8ee3d39838 [dev.regabi] cmd/go: workaround -race issue on ppc64le
+ 2021-01-25 54b251f542 lib/time, time/tzdata: update tzdata to 2021a
+ 2021-01-25 5a76c3d548 [dev.regabi] cmd/compile: modify abiutils for recently updated ABI
+ 2021-01-25 ff82cc971a os: force consistent mtime before running fstest on directory on Windows
+ 2021-01-25 044f937a73 doc/go1.16: fix WalkDir and Walk links
+ 2021-01-25 063c72f06d [dev.regabi] cmd/compile: backport changes from dev.typeparams (9456804)
+ 2021-01-23 b634f5d97a doc/go1.16: add crypto/x509 memory optimization
+ 2021-01-23 9897655c61 doc/go1.16: reword ambiguously parsable sentence
+ 2021-01-23 cd99385ff4 cmd/internal/obj/arm64: fix VMOVQ instruction encoding error
+ 2021-01-23 d05d6fab32 [dev.regabi] cmd/compile: replace ir.Name map with ir.NameSet for SSA 2
+ 2021-01-23 66ee8b158f runtime: restore cgo_import_dynamic for libc.so on openbsd
+ 2021-01-23 48badc5fa8 [dev.regabi] cmd/compile: fix escape analysis problem with closures
+ 2021-01-23 51e1819a8d [dev.regabi] cmd/compile: scan body of closure in tooHairy to check for disallowed nodes
+ 2021-01-22 25c39e4fb5 io/ioutil: fix example test for WriteFile to allow it to run in the playground
+ 2021-01-22 eb21b31e48 runtime: define dummy msanmove
+ 2021-01-22 3a778ff50f runtime: check for g0 stack last in signal handler
+ 2021-01-22 a2cef9b544 cmd/go: don't lookup the path for CC when invoking cgo
+ 2021-01-22 7e0a81d280 [dev.regabi] all: merge master (dab3e5a) into dev.regabi
+ 2021-01-22 dab3e5affe runtime: switch runtime to libc for openbsd/amd64
+ 2021-01-22 a1b53d85da cmd/go: add documentation for test and xtest fields output by go list
+ 2021-01-22 b268b60774 runtime: remove pthread_kill/pthread_self for openbsd
+ 2021-01-22 ec4051763d runtime: fix typo in mgcscavenge.go
+ 2021-01-22 7ece3a7b17 net/http: fix flaky TestDisableKeepAliveUpgrade
+ 2021-01-22 50cba0506f time: clarify Timer.Reset behavior on AfterFunc Timers
+ 2021-01-22 cf10e69f17 doc/go1.16: mention net/http.Transport.GetProxyConnectHeader
+ 2021-01-22 ec1b945265 doc/go1.16: mention path/filepath.WalkDir
+ 2021-01-22 11def3d40b doc/go1.16: mention syscall.AllThreadsSyscall
+ 2021-01-21 07b0235609 doc/go1.16: add notes about package-specific fs.FS changes
+ 2021-01-21 e2b4f1fea5 doc/go1.16: minor formatting fix
+ 2021-01-21 9f43a9e07b doc/go1.16: mention new debug/elf constants
+ 2021-01-21 3c2f11ba5b cmd/go: overwrite program name with full path
+ 2021-01-21 953d1feca9 all: introduce and use internal/execabs
+ 2021-01-21 b186e4d70d cmd/go: add test case for cgo CC setting
+ 2021-01-21 5a8a2265fb cmd/cgo: report exec errors a bit more clearly
+ 2021-01-21 46e2e2e9d9 cmd/go: pass resolved CC, GCCGO to cgo
+ 2021-01-21 3d40895e36 runtime: switch openbsd/arm64 to pthreads
+ 2021-01-21 d95ca91380 crypto/elliptic: fix P-224 field reduction
+ 2021-01-21 d7e71c01ad [dev.regabi] cmd/compile: replace ir.Name map with ir.NameSet for dwarf
+ 2021-01-21 5248f59a22 [dev.regabi] cmd/compile: replace ir.Name map with ir.NameSet for SSA
+ 2021-01-21 970d8b6cb2 [dev.regabi] cmd/compile: replace ir.Name map with ir.NameSet in inlining
+ 2021-01-21 68a4664475 [dev.regabi] cmd/compile: remove tempAssigns in walkCall1
+ 2021-01-21 fd9a391cdd [dev.regabi] cmd/compile: remove CallExpr.Rargs
+ 2021-01-21 19a6db6b63 [dev.regabi] cmd/compile: make sure mkcall* passed non-nil init
+ 2021-01-21 9f036844db [dev.regabi] cmd/compile: use ir.DoChildren directly in inlining
+ 2021-01-21 213c3905e9 [dev.regabi] cmd/compile: use node walked flag to prevent double walk for walkSelect
+ 2021-01-20 1760d736f6 [dev.regabi] cmd/compile: exporting, importing, and inlining functions with OCLOSURE
+ 2021-01-20 ecf4ebf100 cmd/internal/moddeps: check content of all modules in GOROOT
+ 2021-01-20 92cb157cf3 [dev.regabi] cmd/compile: late expansion of return values
+ 2021-01-20 d2d155d1ae runtime: don't adjust timer pp field in timerWaiting status
+ 2021-01-20 803d18fc6c cmd/go: set Incomplete field on go list output if no files match embed
+ 2021-01-20 6e243ce71d cmd/go: have go mod vendor copy embedded files in subdirs
+ 2021-01-20 be28e5abc5 cmd/go: fix mod_get_fallback test
+ 2021-01-20 928bda4f4a runtime: convert openbsd/amd64 locking to libc
+ 2021-01-19 824f2d635c cmd/go: allow go fmt to complete when embedded file is missing
+ 2021-01-19 0575e35e50 cmd/compile: require 'go 1.16' go.mod line for //go:embed
+ 2021-01-19 9423d50d53 [dev.regabi] cmd/compile: use '%q' for printing rune values less than 128
+ 2021-01-19 ccb2e90688 cmd/link: exit before Asmb2 if error
+ 2021-01-19 ca5774a5a5 embed: treat uninitialized FS as empty
+ 2021-01-19 d047c91a6c cmd/link,runtime: switch openbsd/amd64 to pthreads
+ 2021-01-19 61debffd97 runtime: factor out usesLibcall
+ 2021-01-19 9fed39d281 runtime: factor out mStackIsSystemAllocated
+ 2021-01-19 a2f825c542 [dev.regabi] cmd/compile: directly create go.map and go.track symbols
+ 2021-01-19 4a4212c0e5 [dev.regabi] cmd/compile: refactor Linksym creation
+ 2021-01-19 4f5c603c0f [dev.regabi] cmd/compile: cleanup callTargetLSym
+ 2021-01-18 dbab079835 runtime: free Windows event handles after last lock is dropped
+ 2021-01-18 5a8fbb0d2d os: do not close syscall.Stdin in TestReadStdin
+ 2021-01-18 422f38fb6c [dev.regabi] cmd/compile: move stack objects to liveness
+ 2021-01-18 6113db0bb4 [dev.regabi] cmd/compile: convert OPANIC argument to interface{} during typecheck
+ 2021-01-18 4c835f9169 [dev.regabi] cmd/compile: use LinksymOffsetExpr in TypePtr/ItabAddr
+ 2021-01-18 0ffa1ead6e [dev.regabi] cmd/compile: use *obj.LSym instead of *ir.Name for staticdata functions
+ 2021-01-17 7e0fa38aad [dev.regabi] cmd/compile: remove unneeded packages from ir.Pkgs
+ 2021-01-17 99a5db11ac [dev.regabi] cmd/compile: use LinksymOffsetExpr in walkConvInterface
+ 2021-01-17 87845d14f9 [dev.regabi] cmd/compile: add ir.TailCallStmt
+ 2021-01-17 e3027c6828 [dev.regabi] cmd/compile: fix linux-amd64-noopt builder
+ 2021-01-17 59ff93fe64 [dev.regabi] cmd/compile: rename NameOffsetExpr to LinksymOffsetExpr
+ 2021-01-17 82b9cae700 [dev.regabi] cmd/compile: change ir.NameOffsetExpr to use *obj.LSym instead of *Name
+ 2021-01-17 88956fc4b1 [dev.regabi] cmd/compile: stop analyze NameOffsetExpr.Name_ in escape analysis
+ 2021-01-17 7ce2a8383d [dev.regabi] cmd/compile: simplify stack temp initialization
+ 2021-01-17 ba0e8a92fa [dev.regabi] cmd/compile: refactor temp construction in walk
+ 2021-01-17 78e5aabcdb [dev.regabi] cmd/compile: replace Node.HasCall with walk.mayCall
+ 2021-01-16 6de9423445 [dev.regabi] cmd/compile: cleanup OAS2FUNC ordering
+ 2021-01-16 a956a0e909 [dev.regabi] cmd/compile, runtime: fix up comments/error messages from recent renames
+ 2021-01-16 ab3b67abfd [dev.regabi] cmd/compile: remove ONEWOBJ
+ 2021-01-16 c9b1445ac8 [dev.regabi] cmd/compile: remove TypeAssertExpr {Src,Dst}Type fields
+ 2021-01-15 682a1d2176 runtime: detect errors in DuplicateHandle
+ 2021-01-15 9f83418b83 cmd/link: remove GOROOT write in TestBuildForTvOS
+ 2021-01-15 ec9470162f cmd/compile: allow embed into any string or byte slice type
+ 2021-01-15 54198b04db cmd/compile: disallow embed of var inside func
+ 2021-01-15 b386c735e7 cmd/go: fix go generate docs
+ 2021-01-15 bb5075a525 syscall: remove RtlGenRandom and move it into internal/syscall
+ 2021-01-15 1deae0b597 os: invoke processKiller synchronously in testKillProcess
+ 2021-01-15 03a875137f [dev.regabi] cmd/compile: unexport reflectdata.WriteType
+ 2021-01-15 14537e6e54 [dev.regabi] cmd/compile: move stkobj symbol generation to SSA
+ 2021-01-15 ab523fc510 [dev.regabi] cmd/compile: don't promote Byval CaptureVars if Addrtaken
+ 2021-01-15 ff196c3e84 crypto/x509: update iOS bundled roots to version 55188.40.9
+ 2021-01-15 b7a698c73f [dev.regabi] test: disable test on windows because expected contains path separators.
+ 2021-01-15 4be7af23f9 [dev.regabi] cmd/compile: fix ICE during ir.Dump
+ 2021-01-14 e125ccd10e cmd/go: in 'go mod edit', validate versions given to -retract and -exclude
+ 2021-01-14 eb330020dc cmd/dist, cmd/go: pass -arch for C compilation on Darwin
+ 2021-01-14 84e8a06f62 cmd/cgo: remove unnecessary space in cgo export header
+ 2021-01-14 0c86b999c3 cmd/test2json: document passing -test.paniconexit0
+ 2021-01-14 9135795891 cmd/go/internal/load: report positions for embed errors
+ 2021-01-14 35b9c66601 [dev.regabi] cmd/compile,cmd/link: additional code review suggestions for CL 270863
+ 2021-01-14 d9b79e53bb cmd/compile: fix wrong complement for arm64 floating-point comparisons
+ 2021-01-14 c73232d08f cmd/go/internal/load: refactor setErrorPos to PackageError.setPos
+ 2021-01-14 6aa28d3e06 go/build: report positions for go:embed directives
+ 2021-01-14 9734fd482d [dev.regabi] cmd/compile: use node walked flag to prevent double walk for walkSwitch
+ 2021-01-14 f97983249a [dev.regabi] cmd/compile: move more PAUTOHEAP to SSA construction
+ 2021-01-14 4476300425 [dev.regabi] cmd/compile: use byte for CallExpr.Use
+ 2021-01-14 5a5ab24689 [dev.regabi] cmd/compile: do not rely on CallExpr.Rargs for detect already walked calls
+ 2021-01-14 983ac4b086 [dev.regabi] cmd/compile: fix ICE when initializing blank vars
+ 2021-01-13 7eb31d999c cmd/go: add hints to more missing sum error messages
+ 2021-01-13 d6d4673728 [dev.regabi] cmd/compile: fix GOEXPERIMENT=regabi builder
+ 2021-01-13 c41b999ad4 [dev.regabi] cmd/compile: refactor abiutils from "gc" into new "abi"
+ 2021-01-13 861707a8c8 [dev.regabi] cmd/compile: added limited //go:registerparams pragma for new ABI dev
+ 2021-01-13 c1370e918f [dev.regabi] cmd/compile: add code to support register ABI spills around morestack calls
+ 2021-01-13 2abd24f3b7 [dev.regabi] test: make run.go error messages slightly more informative
+ 2021-01-13 9a19481acb [dev.regabi] cmd/compile: make ordering for InvertFlags more stable
+ 2021-01-12 d9acf6f3a3 [dev.regabi] cmd/compile: remove Func.ClosureType
+ 2021-01-12 41352fd401 [dev.regabi] cmd/compile: transform closures during walk
+ 2021-01-12 d6ad88b4db [dev.regabi] cmd/compile: compile functions before closures
+ 2021-01-12 432f9ffb11 [dev.regabi] cmd/compile: unindent compileFunctions
+ 2021-01-12 cc90e7a51e [dev.regabi] cmd/compile: always use the compile queue
+ 2021-01-12 cd5b74d2df [dev.regabi] cmd/compile: call NeedFuncSym in InitLSym
+ 2021-01-12 ba76567bc2 cmd/go/internal/modload: delete unused *mvsReqs.next method
+ 2021-01-12 665def2c11 encoding/asn1: document unmarshaling behavior for IMPLICIT string fields
+ 2021-01-12 95acd8121b [dev.regabi] cmd/compile: remove Name.Typegen
+ 2021-01-12 12ee55ba7b [dev.regabi] cmd/compile: stop using Vargen for import/export
+ 2021-01-12 b4d2a0445b [dev.regabi] cmd/compile: refactor closure var setup/teardown
+ 2021-01-12 f57f484053 [dev.regabi] cmd/compile: decouple escape analysis from Name.Vargen
+ 2021-01-11 81ea89adf3 cmd/go: fix non-script staleness checks interacting badly with GOFLAGS
+ 2021-01-11 759309029f doc: update editors.html for Go 1.16
+ 2021-01-11 c3b4c7093a cmd/internal/objfile: don't require runtime.symtab symbol for XCOFF
+ 2021-01-10 7fd84c6e46 [dev.regabi] cmd/compile: remove OCLOSUREREAD
+ 2021-01-10 c9c26d7ffb [dev.regabi] cmd/compile: use ClosureVars for method value wrappers
+ 2021-01-10 950cf4d46c [dev.regabi] cmd/compile: bind closure vars during SSA constructions
+ 2021-01-10 8b2efa990b [dev.regabi] cmd/compile: deref PAUTOHEAPs during SSA construction
+ 2021-01-08 59bfc18e34 cmd/go: add hint to read 'go help vcs' to GOVCS errors
+ 2021-01-08 6ee9b118a2 [dev.regabi] cmd/compile: remove fmt_test code; it has outlived its usefulness
+ 2021-01-08 cd6f3a54e4 cmd/go: revise 'go help' documentation for modules
+ 2021-01-08 6192b98751 cmd/go: make hints in error messages more consistent
+ 2021-01-08 25886cf4bd cmd/go: preserve sums for indirect deps fetched by 'go mod download'
+ 2021-01-08 6250833911 runtime/metrics: mark histogram metrics as cumulative
+ 2021-01-08 8f6a9acbb3 runtime/metrics: remove unused StopTheWorld Description field
+ 2021-01-08 6598c65646 cmd/compile: fix exponential-time init-cycle reporting
+ 2021-01-08 fefad1dc85 test: fix timeout code for invoking compiler
+ 2021-01-08 6728118e0a cmd/go: pass signals forward during "go tool"
+ 2021-01-08 e65c543f3c go/build/constraint: add parser for build tag constraint expressions
+ 2021-01-08 0c5afc4fb7 testing/fstest,os: clarify racy behavior of TestFS
+ 2021-01-08 32afcc9436 runtime/metrics: change unit on *-by-size metrics to match bucket unit
+ 2021-01-08 c6513bca5a io/fs: minor corrections to Glob doc
+ 2021-01-08 b241938e04 [dev.regabi] cmd/compile: fix some methods error text
+ 2021-01-08 304f769ffc cmd/compile: don't short-circuit copies whose source is volatile
+ 2021-01-08 ae97717133 runtime,runtime/metrics: use explicit histogram boundaries
+ 2021-01-08 a9ccd2d795 go/build: skip string literal while findEmbed
+ 2021-01-08 d92f8add32 archive/tar: fix typo in comment
+ 2021-01-08 cab1202183 cmd/link: accept extra blocks in TestFallocate
+ 2021-01-08 ee4d32249b io/fs: minor corrections to Glob release date
+ 2021-01-08 54bd1ccce2 cmd: update to latest golang.org/x/tools
+ 2021-01-07 9ec21a8f34 Revert "reflect: support multiple keys in struct tags"
+ 2021-01-07 091414b5b7 io/fs: correct WalkDirFunc documentation
+ 2021-01-07 9b55088d6b doc/go1.16: add release note for disallowing non-ASCII import paths
+ 2021-01-07 fa90aaca7d cmd/compile: fix late expand_calls leaf type for OpStructSelect/OpArraySelect
+ 2021-01-07 7cee66d4cb cmd/go: add documentation for Embed fields in go list output
+ 2021-01-07 e60cffa4ca html/template: attach functions to namespace
+ 2021-01-07 6da2d3b7d7 cmd/link: fix typo in asm.go
+ 2021-01-07 df81a15819 runtime: check mips64 VDSO clock_gettime return code
+ 2021-01-06 4787e906cf crypto/x509: rollback new CertificateRequest fields
+ 2021-01-06 c9658bee93 cmd/go: make module suggestion more friendly
+ 2021-01-06 4c668b25c6 runtime/metrics: fix panic message for Float64Histogram
+ 2021-01-06 d2131704a6 net/http/httputil: fix deadlock in DumpRequestOut
+ 2021-01-05 3e1e13ce6d cmd/go: set cfg.BuildMod to "readonly" by default with no module root
+ 2021-01-05 0b0d004983 cmd/go: pass embedcfg to gccgo if supported
+ 2021-01-05 cb05a0aa6a [dev.regabi] cmd/compile: remove toolstash scaffolding
+ 2021-01-05 9821838832 [dev.regabi] cmd/compile: remove CaptureVars
+ 2021-01-05 fd43831f44 [dev.regabi] cmd/compile: reimplement capture analysis
+ 2021-01-05 fb69c67cad [dev.regabi] test: enable finalizer tests on !amd64
+ 2021-01-05 1b85e7c057 cmd/go: don't scan gccgo standard library packages for imports
+ 2021-01-05 81f4f0e912 [dev.regabi] cmd/compile: remove race-y check in Name.Canonical
+ 2021-01-05 6b37b15d95 runtime: don't take allglock in tracebackothers
+ 2021-01-05 4a9d9adea4 [dev.regabi] cmd/compile: remove initname function
+ 2021-01-05 77365c5ed7 [dev.regabi] cmd/compile: add Name.Canonical and move Byval
+ 2021-01-05 e09783cbc0 [dev.regabi] cmd/compile: make ir.StaticValue safer
+ 2021-01-05 9aa950c407 [dev.regabi] cmd/compile: make ir.OuterValue safer
+ 2021-01-05 eb626409d1 [dev.regabi] cmd/compile: simplify CaptureVars
+ 2021-01-05 c28ca67a96 [dev.regabi] cmd/compile: fix ir.Dump for []*CaseClause, etc
+ 2021-01-04 9eef49cfa6 math/rand: fix typo in comment
+ 2021-01-04 b01fb2af9e testing/fstest: fix typo in error message
+ 2021-01-04 f24e40c14a [dev.regabi] cmd/compile: remove Name.Class_ accessors
+ 2021-01-04 d89705e087 [dev.regabi] cmd/compile: fix re-export of parameters
+ 2021-01-04 290b4154b7 [dev.regabi] cmd/compile: fix ICE due to large uint64 constants
+ 2021-01-04 a30fd52884 [dev.regabi] cmd/compile: use ir.NewNameAt in SubstArgTypes
+ 2021-01-03 8fc44cf0fa [dev.regabi] cmd/compile: remove a couple CloneName calls
+ 2021-01-03 907a4bfdc7 [dev.regabi] cmd/compile: fix map assignment order
+ 2021-01-03 f2e6dab048 [dev.regabi] cmd/compile: remove walkReturn "common case" path
+ 2021-01-03 d36a6bf44d [dev.regabi] cmd/compile: improve walkReturn common case
+ 2021-01-03 a317067d65 [dev.regabi] cmd/compile: improve ascompatee
+ 2021-01-03 5d80a590a2 [dev.regabi] cmd/compile: simplify walkReturn
+ 2021-01-03 bb1b6c95c2 [dev.regabi] cmd/compile: remove Node.{,Set}Walkdef
+ 2021-01-03 57c426c9a5 [dev.regabi] cmd/compile: tighten typecheckdef to *ir.Name
+ 2021-01-03 b1747756e3 [dev.regabi] cmd/compile: reorganize escape analysis somewhat
+ 2021-01-02 f2538033c0 [dev.regabi] cmd/compile: remove Nodes.Set [generated]
+ 2021-01-02 2f2d4b4e68 [dev.regabi] cmd/compile: remove {Ptr,Set}Init from Node interface
+ 2021-01-01 3dd5867605 doc: 2021 is the Year of the Gopher
+ 2021-01-01 1544a03198 [dev.regabi] cmd/compile: refactor redundant type conversion [generated]
+ 2021-01-01 7958a23ea3 [dev.regabi] cmd/compile: use *ir.Name where possible in inl.go
+ 2021-01-01 bfa97ba48f [dev.regabi] test: add another closure test case
+ 2021-01-01 67ad695416 [dev.regabi] cmd/compile: split escape analysis state
+ 2021-01-01 fad9a8b528 [dev.regabi] cmd/compile: simplify inlining of closures
+ 2021-01-01 7d55669847 [dev.regabi] cmd/compile: simplify dwarfgen.declPos
+ 2021-01-01 9ed1577779 [dev.regabi] cmd/compile: remove Func.ClosureEnter
+ 2021-01-01 ece345aa69 [dev.regabi] cmd/compile: expand documentation for Func.Closure{Vars,Enter}
+ 2021-01-01 6ddbc75efd [dev.regabi] cmd/compile: earlier deadcode removal
+ 2021-01-01 68e6fa4f68 [dev.regabi] cmd/compile: fix package-initialization order
+ 2021-01-01 3a4474cdfd [dev.regabi] cmd/compile: some more manual shuffling
+ 2021-01-01 0f1d2129c4 [dev.regabi] cmd/compile: reshuffle type-checking code [generated]
+ 2021-01-01 b8fd3440cd [dev.regabi] cmd/compile: report unused variables during typecheck
+ 2021-01-01 fd22df9905 [dev.regabi] cmd/compile: remove idempotent Name() calls [generated]
+ 2020-12-31 dfbcff80c6 [dev.regabi] cmd/compile: make copyExpr return *ir.Name directly
+ 2020-12-31 77fd81a3e6 [dev.regabi] cmd/compile: use names for keep alive variables in function call
+ 2020-12-31 8fe1197654 [dev.regabi] cmd/compile: remove Name.orig
+ 2020-12-31 477b049060 [dev.regabi] cmd/compile: fix printing of method expressions
+ 2020-12-31 95ce805d14 io/fs: remove darwin/arm64 special condition
+ 2020-12-30 20d0991b86 lib/time, time/tzdata: update tzdata to 2020f
+ 2020-12-30 ed301733bb misc/cgo/testcarchive: remove special flags for Darwin/ARM
+ 2020-12-30 0ae2e032f2 misc/cgo/test: enable TestCrossPackageTests on darwin/arm64
+ 2020-12-30 178c667db2 [dev.regabi] cmd/compile: fix OSLICEARR comments
+ 2020-12-30 f0d99def5b [dev.regabi] cmd/compile: add newline to ir.Dump
+ 2020-12-30 451693af71 [dev.regabi] cmd/compile: simplify typecheckdef
+ 2020-12-30 0c1a899a6c [dev.regabi] cmd/compile: fix defined-pointer method call check
+ 2020-12-30 f9b67f76a5 [dev.regabi] cmd/compile: change ir.DoChildren to use bool result type
+ 2020-12-30 499851bac8 [dev.regabi] cmd/compile: generalize ir/mknode.go
+ 2020-12-30 82ab3d1448 [dev.regabi] cmd/compile: use *ir.Name for Decl.X
+ 2020-12-30 9958b7ed3e [dev.regabi] cmd/compile: unexport ir.FmtNode
+ 2020-12-29 780b4de16b misc/ios: fix wording for command line instructions
+ 2020-12-29 b4a71c95d2 doc/go1.16: reference misc/ios/README for how to build iOS programs
+ 2020-12-29 f83e0f6616 misc/ios: add to README how to build ios executables
+ 2020-12-29 f5816624cd [dev.regabi] cmd/compile: change AddrExpr.Alloc to AddrExpr.Prealloc
+ 2020-12-29 850aa7c60c [dev.regabi] cmd/compile: use *ir.Name instead of ir.Node for CaseClause.Var
+ 2020-12-29 37babc97bb [dev.regabi] cmd/compile: allow visitor visits *ir.Name
+ 2020-12-29 5cf3c87fa6 [dev.regabi] cmd/compile: generate case/comm clause functions in mknode.go
+ 2020-12-29 b3e1ec97fd [dev.regabi] cmd/compile: move new addrtaken bit back to the old name
+ 2020-12-29 0620c674dd [dev.regabi] cmd/compile: remove original addrtaken bit
+ 2020-12-29 0523d525ae [dev.regabi] cmd/compile: separate out address taken computation from typechecker
+ 2020-12-29 9ea272e5ec [dev.regabi] cmd/compile: simplify ir.Func somewhat
+ 2020-12-29 e40cb4d4ae [dev.regabi] cmd/compile: remove more unused code
+ 2020-12-29 6f30c95048 [dev.regabi] cmd/compile: remove unneeded indirection
+ 2020-12-29 171fc6f223 [dev.regabi] cmd/compile: remove workarounds for go/constant issues
+ 2020-12-29 33801cdc62 [dev.regabi] cmd/compile: use Ntype where possible
+ 2020-12-29 82ad3083f8 [dev.regabi] cmd/compile: remove typ from AssignOpStmt
+ 2020-12-29 e34c44a7c4 [dev.regabi] cmd/compile: refactoring typecheck arith
+ 2020-12-29 a5ec920160 [dev.regabi] cmd/compile: more Linksym cleanup
+ 2020-12-29 ec59b197d5 [dev.regabi] cmd/compile: rewrite to use linksym helpers [generated]
+ 2020-12-29 25c613c02d [dev.regabi] cmd/compile: add Linksym helpers
+ 2020-12-29 289da2b33e [dev.regabi] cmd/compile: move Node.Opt to Name
+ 2020-12-29 6acbae4fcc [dev.regabi] cmd/compile: address some ir TODOs
+ 2020-12-29 4629f6a51d [dev.regabi] cmd/compile: merge {Selector,CallPart,Method}Expr
+ 2020-12-29 e563715b30 [dev.regabi] cmd/compile: remove Sym.Importdef
+ 2020-12-29 3f370b75fb [dev.regabi] cmd/compile: cleanup //go:generate directives
+ 2020-12-28 4fd9455882 io/fs: fix typo in comment
+ 2020-12-28 07569dac4e [dev.regabi] all: merge master (1d78139) into dev.regabi
+ 2020-12-28 76136be027 [dev.regabi] cmd/compile: check for recursive import in ImportBody
+ 2020-12-28 fda7ec3a3f [dev.regabi] cmd/compile: remove Name.IsDDD, etc
+ 2020-12-28 098a6490b9 [dev.regabi] cmd/compile: remove Declare in makepartialcall
+ 2020-12-28 137f0d2e06 [dev.regabi] cmd/compile: remove unnecessary Name.Sym call
+ 2020-12-28 3383b5c74a [dev.regabi] cmd/compile: flatten dependency graph [generated]
+ 2020-12-28 f8afb8216a [dev.regabi] cmd/compile: rename CommStmt and CaseStmt [generated]
+ 2020-12-28 5f3bd59a0d [dev.regabi] cmd/compile: remove some unneeded code in package ir
+ 2020-12-28 3bdafb0d82 [dev.regabi] cmd/compile: remove CommStmt.List
+ 2020-12-28 2ecf52b841 [dev.regabi] cmd/compile: separate CommStmt from CaseStmt
+ 2020-12-28 ed9772e130 [dev.regabi] cmd/compile: add explicit file name in types generation
+ 2020-12-28 a59d26603f [dev.regabi] cmd/compile: use []*CaseStmt in {Select,Switch}Stmt
+ 2020-12-28 fbc4458c06 [dev.regabi] cmd/compile: simplify some tree traversal code
+ 2020-12-28 6c67677541 [dev.regabi] cmd/compile: simplify FuncName and PkgFuncName
+ 2020-12-28 676d794b81 [dev.regabi] cmd/compile: remove refersToCommonName
+ 2020-12-28 c98548e110 [dev.regabi] cmd/compile: merge ascompatee, ascompatee1, and reorder3
+ 2020-12-28 4c215c4fa9 [dev.regabi] cmd/compile: simplify and optimize reorder3
+ 2020-12-28 e6c973198d [dev.regabi] cmd/compile: stop mangling SelectorExpr.Sel for ODOTMETH
+ 2020-12-28 135ce1c485 [dev.regabi] cmd/compile: desugar OMETHEXPR into ONAME during walk
+ 2020-12-28 0f732f8c91 [dev.regabi] cmd/compile: minor walkExpr cleanups
+ 2020-12-28 0de8eafd98 [dev.regabi] cmd/compile: remove SelectorExpr.Offset field
+ 2020-12-28 a4f335f420 [dev.regabi] cmd/compile: always use a Field for ODOTPTR expressions
+ 2020-12-26 1d78139128 runtime/cgo: fix Android build with NDK 22
+ 2020-12-25 2018b68a65 net/mail: don't use MDT in test
+ 2020-12-25 e4f293d853 [dev.regabi] cmd/compile: fix OCALLMETH desugaring
+ 2020-12-25 1d9a1f67d5 [dev.regabi] cmd/compile: don't emit reflect data for method types
+ 2020-12-25 396b6c2e7c [dev.regabi] cmd/compile: cleanup assignment typechecking
+ 2020-12-25 e24d2f3d05 [dev.regabi] cmd/compile: remove typ from RangeStmt
+ 2020-12-25 2785c691c2 [dev.regabi] cmd/compile: cleanup devirtualization docs
+ 2020-12-25 4b1d0fe66f [dev.regabi] cmd/compile: new devirtualization pkg [generated]
+ 2020-12-24 082cc8b7d9 [dev.regabi] cmd/compile: change ir.IsAssignable -> ir.IsAddressable
+ 2020-12-24 27b248b307 [dev.regabi] cmd/compile: separate range stmt Vars to Key, Value nodes
+ 2020-12-23 40818038bf [dev.regabi] cmd/compile: change CaseStmt.Vars to Var
+ 2020-12-23 b116404444 runtime: shift timeHistogram buckets and allow negative durations
+ 2020-12-23 8db7e2fecd runtime: fix allocs-by-size and frees-by-size buckets
+ 2020-12-23 fb96f07e1a runtime: fix nStackRoots comment about stack roots
+ 2020-12-23 d1502b3c72 lib/time, time/tzdata: update tzdata to 2020e
+ 2020-12-23 30c99cbb7a cmd/go: add the Retract field to 'go help mod edit' definition of the GoMod struct
+ 2020-12-23 49d0b239cb doc: fix a typo in contribute.html
+ 2020-12-23 9eeed291bc [dev.regabi] cmd/compile: eliminate usage of ir.Node in liveness
+ 2020-12-23 d1d64e4cea [dev.regabi] cmd/compile: split SliceExpr.List into separate fields
+ 2020-12-23 98a73030b0 cmd/go: in 'go get', promote named implicit dependencies to explicit
+ 2020-12-23 d19018e8f1 [dev.regabi] cmd/compile: split SliceHeaderExpr.LenCap into separate fields
+ 2020-12-23 53f082b0ee [dev.regabi] cmd/compile: cleanup export code further
+ 2020-12-23 31267f82e1 [dev.regabi] cmd/compile: simplify function/interface/struct typechecking
+ 2020-12-23 addade2cce [dev.regabi] cmd/compile: prefer types constructors over typecheck
+ 2020-12-23 18ebfb49e9 [dev.regabi] cmd/compile: cleanup noder
+ 2020-12-23 87a592b356 [dev.regabi] cmd/compile: cleanup import/export code
+ 2020-12-23 5898025026 [dev.regabi] cmd/compile: update mkbuiltin.go to use new type constructors
+ 2020-12-23 63c96c2ee7 [dev.regabi] cmd/compile: update mkbuiltin.go and re-enable TestBuiltin
+ 2020-12-23 37f138df6b [dev.regabi] cmd/compile: split out package test [generated]
+ 2020-12-23 3d8a3cb06b [dev.regabi] cmd/compile: split out package pkginit [generated]
+ 2020-12-23 3f04d964ab [dev.regabi] cmd/compile: split up walkexpr1, walkstmt [generated]
+ 2020-12-23 e4895ab4c0 [dev.regabi] cmd/compile: split out package walk [generated]
+ 2020-12-23 01fd2d05c8 [dev.regabi] cmd/compile: split out package dwarfgen [generated]
+ 2020-12-23 6c34d2f420 [dev.regabi] cmd/compile: split out package ssagen [generated]
+ 2020-12-23 de65151e50 [dev.regabi] cmd/compile: split out package reflectdata [generated]
+ 2020-12-23 4dfb5d91a8 [dev.regabi] cmd/compile: split out package staticdata [generated]
+ 2020-12-23 fbc82f03b1 [dev.regabi] cmd/compile: split out package noder [generated]
+ 2020-12-23 de454eef5f [dev.regabi] cmd/compile: split out package escape [generated]
+ 2020-12-23 071ab0a14c [dev.regabi] cmd/compile: split out package liveness [generated]
+ 2020-12-23 0ced54062e [dev.regabi] cmd/compile: split out package objw [generated]
+ 2020-12-23 575fd6ff0a [dev.regabi] cmd/compile: split out package inline [generated]
+ 2020-12-23 0256ba99a8 [dev.regabi] cmd/compile: split up typecheck1 [generated]
+ 2020-12-23 b9693d7627 [dev.regabi] cmd/compile: split out package typecheck [generated]
+ 2020-12-23 dac0de3748 [dev.regabi] cmd/compile: move type size calculations into package types [generated]
+ 2020-12-23 527a1895d6 [dev.regabi] cmd/compile: move helpers into package ir [generated]
+ 2020-12-23 65c4c6dfb2 [dev.regabi] cmd/compile: group known symbols, packages, names [generated]
+ 2020-12-23 9ee309255a [dev.regabi] cmd/compile: move helpers into package types [generated]
+ 2020-12-23 ead4957892 [dev.regabi] cmd/compile: move helpers into package base [generated]
+ 2020-12-23 440308ffd7 [dev.regabi] cmd/compile: simplify Nodes usage [generated]
+ 2020-12-23 f9d373720e [dev.regabi] cmd/compile: remove Left, Right etc methods [generated]
+ 2020-12-23 14d667341f [dev.regabi] cmd/compile: remove Node.Left etc [generated]
+ 2020-12-23 6f27d29be0 [dev.regabi] cmd/compile: remove ir.Nod [generated]
+ 2020-12-23 fd6ba1c8a2 os/signal: fix a deadlock with syscall.AllThreadsSyscall() use
+ 2020-12-23 69cf39089f [dev.regabi] cmd/compile: do not die in early base.FlushErrors
+ 2020-12-23 6d03cde88a [dev.regabi] cmd/dist: automatically bootstrap cmd subdirs
+ 2020-12-23 b0b0d98283 runtime: linux iscgo support for not blocking nptl signals
+ 2020-12-23 d1d1099c91 [dev.regabi] cmd/compile: fixes for big rewrite
+ 2020-12-22 223331fc0c cmd/go/internal/modload: add hint for missing implicit dependency
+ 2020-12-22 ec741b0447 [dev.regabi] all: merge master (c9fb4eb) into dev.regabi
+ 2020-12-22 acc32ea124 [dev.regabi] codereview.cfg: add config for dev.regabi
+ 2020-12-22 c9fb4eb0a2 cmd/link: handle grouped resource sections
+ 2020-12-22 c40934b33d [dev.regabi] cmd/compile: adjust one case in walkexpr
+ 2020-12-22 280e7fd1ee [dev.regabi] cmd/compile: only access Func method on concrete types
+ 2020-12-22 51ba53f5c2 [dev.regabi] cmd/compile: separate misc for gc split
+ 2020-12-22 572f168ed2 [dev.regabi] cmd/compile: separate various from Main
+ 2020-12-22 3b12c6dc08 [dev.regabi] cmd/compile: separate typecheck more cleanly
+ 2020-12-22 7c8f5356ab [dev.regabi] cmd/compile: separate dowidth better
+ 2020-12-22 c06a354bcc test: trigger SIGSEGV instead of SIGTRAP in issue11656.go
+ 2020-12-22 0aa9b4709a cmd/pack: r command create output file if not exist
+ 2020-12-22 cb28c96be8 [dev.regabi] cmd/compile,cmd/link: initial support for ABI wrappers
+ 2020-12-22 c8610e4700 [dev.regabi] cmd/compile: add ir.BasicLit to represent literals
+ 2020-12-22 3512cde10a [dev.regabi] cmd/compile: stop reusing Ntype for OSLICELIT length
+ 2020-12-22 2755361e6a [dev.regabi] cmd/compile: change noder.declNames to returns ir.Names
+ 2020-12-22 301af2cb71 [dev.regabi] runtime/race: adjust test pattern match for ABI wrapper
+ 2020-12-22 4d27c4c223 runtime: correct error handling in several FreeBSD syscall wrappers
+ 2020-12-22 9b6147120a cmd/pack: treat compiler's -linkobj output as "compiler object"
+ 2020-12-22 306b2451c8 [dev.regabi] runtime: fix ABI targets in runtime.panic{Index,Slice} shims
+ 2020-12-21 bc7e4d9257 syscall: don't generate ptrace on iOS
+ 2020-12-21 94cfeca0a5 [dev.regabi] cmd/compile: stop using ONONAME with Name
+ 2020-12-21 cb4898a77d [dev.regabi] cmd/compile: simplify declaration importing
+ 2020-12-21 06915ac14d [dev.regabi] cmd/compile: move itabname call out of implements
+ 2020-12-21 6cff874c47 runtime/metrics: add Read examples
+ 2020-12-21 4e8f681eff Merge "[dev.regabi] all: merge master into dev.regabi" into dev.regabi
+ 2020-12-21 1a523c8ab0 [dev.regabi] cmd/compile: separate nowritebarrierrec from main
+ 2020-12-21 e999c17022 [dev.regabi] cmd/compile: separate ssa from other phases
+ 2020-12-21 4836e28ac0 [dev.regabi] cmd/compile: separate noder more cleanly
+ 2020-12-21 85ce6ecfe3 [dev.regabi] cmd/compile: separate exportsym more cleanly
+ 2020-12-21 1a3b036b83 [dev.regabi] cmd/compile: collect global compilation state
+ 2020-12-21 2153a99914 [dev.regabi] cmd/compile: setup to move Addrconst, Patch into cmd/internal/obj
+ 2020-12-21 0bb0baf683 [dev.regabi] cmd/compile: cleanup for concrete types - more
+ 2020-12-21 ca8e17164e [dev.regabi] all: merge master into dev.regabi
+ 2020-12-21 8438a5779b runtime: use _exit on darwin
+ 2020-12-21 cb95819cf6 runtime: detect netbsd netpoll overrun in sysmon
+ 2020-12-21 53c984d976 runtime: skip wakep call in wakeNetPoller on Plan 9
+ 2020-12-21 9abbe27710 test: skip issue11656.go on mips/mips64/ppc64
+ 2020-12-20 89b44b4e2b cmd/compile: recognize reassignments involving receives
+ 2020-12-19 55b58018f4 test: for issue11656 try to execute trap, not call it
+ 2020-12-18 626cc7c02d test: permit "exponent too large" error
+ 2020-12-18 139cd0e12f go/build: make TestDependencies work again
+ 2020-12-18 2de7866470 os: remove dependency on strings package
+ 2020-12-18 c45313bf45 [dev.regabi] cmd/compile: remove prealloc map
+ 2020-12-18 ffb0cb7044 [dev.regabi] cmd/compile: remove uses of Name.Offset, Name.copy
+ 2020-12-18 c76be2a24e [dev.regabi] cmd/compile: add ONAMEOFFSET, delete to-be-deleted fields
+ 2020-12-18 4e8f1e139f [dev.regabi] cmd/compile: cleanup for concrete types - sinit
+ 2020-12-18 27aba22651 [dev.regabi] cmd/compile: cleanup for concrete types - walk
+ 2020-12-18 0b9cb63b8d [dev.regabi] cmd/compile: rename ir.Find to ir.Any and update uses
+ 2020-12-18 ae652a4ac9 os/signal: fix flaky tests for NotifyContext.
+ 2020-12-18 740851baca cmd/link: avoid use of -T when linking with lld
+ 2020-12-18 f1778c28a9 test: recognize and use gc build tag
+ 2020-12-17 8fcf318123 api/go1.16: remove crypto/tls APIs that are moved to Go 1.17
+ 2020-12-17 520f3b72db crypto/tls: revert "add HandshakeContext method to Conn"
+ 2020-12-17 2ff33f5e44 api: promote next to go1.16
+ 2020-12-17 aeedc9f804 [dev.regabi] cmd/compile: remove OSELRECV
+ 2020-12-17 0328c3b660 [dev.regabi] cmd/compile: use OSELRECV2 for all <-c variants
+ 2020-12-17 88e1415d08 [dev.regabi] cmd/compile: add type assertion in regabi test
+ 2020-12-17 9c384e881e [dev.regabi] cmd/compile: cleanup for concrete types - mop-up
+ 2020-12-17 be64c8bece [dev.regabi] cmd/compile: cleanup for concrete types - noder
+ 2020-12-17 5024396563 [dev.regabi] cmd/compile: cleanup for concrete types - subr
+ 2020-12-17 dd67b13d07 [dev.regabi] cmd/compile: cleanup for concrete types - range, select, swt
+ 2020-12-17 42fec2ded4 [dev.regabi] cmd/compile: cleanup for concrete types - const
+ 2020-12-17 389ae3d5ba [dev.regabi] cmd/compile: cleanup for concrete types - inl
+ 2020-12-17 5fe64298a4 [dev.regabi] cmd/compile: cleanup for concrete types - import/export
+ 2020-12-17 aa55d4e54b [dev.regabi] cmd/compile: cleanup for concrete types - escape
+ 2020-12-17 846740c17f [dev.regabi] cmd/compile: cleanup for concrete types - ssa
+ 2020-12-17 bf9bbbd6ed [dev.regabi] cmd/compile: cleanup for concrete types - order
+ 2020-12-17 4ac6a6317b [dev.regabi] cmd/compile: cleanup for concrete types - typecheck
+ 2020-12-17 f6efa3d4a4 [dev.regabi] cmd/compile: simplify ir.Find, replace ir.Inspect with ir.Visit
+ 2020-12-17 f6d2834f8f [dev.regabi] cmd/compile: limit Implicit method to nodes where it is defined
+ 2020-12-17 7fde0d2b50 [dev.regabi] cmd/compile: remove use of Initorder, Offset Node fields for initorder
+ 2020-12-17 114af2a044 [dev.regabi] cmd/compile: change Nodes to be a slice
+ 2020-12-17 4dfc7333f4 [dev.regabi] cmd/compile: update ir/fmt for concrete types
+ 2020-12-17 a997543292 [dev.regabi] cmd/compile: fix potential closure waste in Order
+ 2020-12-17 578fbbe3aa [dev.regabi] cmd/compile: rewrite some generic ir.Nod calls
+ 2020-12-17 5ae70b85c6 [dev.regabi] cmd/compile: cleanup preparing for concrete types, 2
+ 2020-12-17 fa06894b36 [dev.regabi] cmd/compile: cleanup preparing for concrete types
+ 2020-12-17 5a4db102b2 html/template: avoid race when escaping updates template
+ 2020-12-16 b0f01e17f8 go/types: report error for invalid (but empty) expr switch
+ 2020-12-16 5abda2618b cmd/link: handle large relocation addend on darwin/arm64
+ 2020-12-16 a318d56c1e cmd/link: pass arch-specific flags to external linker when testing supported flag
+ 2020-12-16 f4e7a6b905 cmd/internal/goobj: fix buglet in object file reader
+ 2020-12-16 75e16f5127 doc/go1.16: add link to reflect.StructTag
+ 2020-12-16 08b5091d03 net: close connection in localServer teardown
+ 2020-12-16 8981092d71 cmd/link: ignore SEH marking on PE objects
+ 2020-12-15 731bb54038 test: update for gofrontend error message changes
+ 2020-12-15 129bb1917b doc/go1.15: mention 1.15.3 cgo restriction on empty structs
+ 2020-12-15 685a322fe4 test: match gofrontend error messages
+ 2020-12-15 3d6467824c test: only require issue11674 errors with gc compiler
+ 2020-12-15 7cdc84a15b test: remove bug429 (duplicates runtime.TestSimpleDeadlock)
+ 2020-12-15 412dc2f4d3 test: adjust issue11371 to fit in required precision
+ 2020-12-15 8e2d74b705 test: only check for issue11362 error with gc
+ 2020-12-15 f8ac237032 test: import file name for issue19028
+ 2020-12-15 a508840c67 doc/go1.16: fix path, path/filepath release notes
+ 2020-12-15 5046cb8a6e doc/go1.16: fix formatting in net, net/http and net/http/httputil sections
+ 2020-12-15 3298300ddf text/template: error on range over send channel
+ 2020-12-15 4c2d66f642 [dev.regabi] cmd/compile: use ir.Ident for imported identifiers
+ 2020-12-15 305d93ef84 [dev.regabi] cmd/compile: type check externdcl earlier
+ 2020-12-15 9f16620f46 [dev.regabi] cmd/compile: fix latent Sym.SetPkgDef issue
+ 2020-12-15 5a25a3fd1d test: recognize gofrontend error messages
+ 2020-12-14 fea898a4b0 [dev.regabi] cmd/compile: intercept the making of OADDR nodes
+ 2020-12-14 663cd862ed cmd/link: do not mark resource section as writable
+ 2020-12-14 48dfa2b2dc cmd/link: deal with ADDR32NB relocations the same way as ADDR32 on arm
+ 2020-12-14 033390d9ad cmd/link: recognize arm header of PE objects
+ 2020-12-14 48906a6d57 net/http/pprof: don't treat os.Args as format string in Cmdline handler
+ 2020-12-14 6e3cc5c56f go/types: report invalid ... in conversions
+ 2020-12-14 278b9a8a4a io/fs: fix package reference in FS godoc
+ 2020-12-14 617383377f [dev.regabi] cmd/compile: reorg generated array hash loop
+ 2020-12-14 d06794da4a doc/go1.16: add missing <code> tag
+ 2020-12-14 dea6d94a44 math/big: add test for recursive division panic
+ 2020-12-14 2f5b1a3974 test: make a race detector test robust to timing variations
+ 2020-12-14 c81343ce3a net/http: attempt deadlock fix in TestDisableKeepAliveUpgrade
+ 2020-12-14 828746ec57 debug/dwarf: don't try to parse addr/rnglists header
+ 2020-12-14 be10af7c4e test: match gofrontend error messages
+ 2020-12-14 89f38323fa [dev.regabi] cmd/compile: add register ABI analysis utilities
+ 2020-12-14 ce61ccca8f test: match gofrontend error messages
+ 2020-12-14 a58be734ea cmd/compile: fix incorrect shift count type with s390x rules
+ 2020-12-14 8ce37e4110 [dev.regabi] cmd/compile: fix noopt builder
+ 2020-12-14 7e17b46c58 [dev.regabi] cmd/compile/internal/types: add IsScalar query method
+ 2020-12-14 2b76429eb0 [dev.regabi] cmd/compile: refactor type initialization code into helper
+ 2020-12-14 9c5241e520 [dev.regabi] cmd/compile: remove unnecessary String methods
+ 2020-12-14 267975dc47 Merge branch 'master' into dev.regabi
+ 2020-12-14 64d8846aae cmd/go: print hint when 'go install' run without version outside module
+ 2020-12-14 451b6b38fd cmd/go: refactor error reporting in internal/load
+ 2020-12-14 0a02371b05 cmd/compile: set correct type for OpIData
+ 2020-12-11 41d8e61a6b doc: make clear that Go 1.4 is not required for bootstrap
+ 2020-12-11 14305527f6 cmd/compile: fix select statement evaluation order corner case
+ 2020-12-11 1341a3decd cmd/go: add documentation for the -overlay flag
+ 2020-12-11 e508c1c67b cmd/link/internal/loadelf: support additional ELF relocations on mips64
+ 2020-12-11 58e381b0b2 cmd/vet: vendor in x/tools, update structtag vet check
+ 2020-12-10 e012d0dc34 syscall: drop references to Unix epoch in Timeval/Timespec docs
+ 2020-12-10 1fe891a937 doc/go1.16: add vet release note for CL 235677
+ 2020-12-10 6d3d3fb37f doc/go1.16: address some remaining high-level TODOs
+ 2020-12-10 6a64f6dc31 cmd/go: encode backslash and newline in response files
+ 2020-12-10 985d91666c runtime/metrics: add a note about floating-point values to package docs
+ 2020-12-10 e0d20e52ee runtime/metrics: expand Read documention with caveats
+ 2020-12-10 d0f40d2922 runtime/metrics: add ordering line to supported metrics docs
+ 2020-12-10 6d2b3351f6 test: match gofrontend error messages
+ 2020-12-10 e5522c882d std: update golang.org/x/net to 20201209123823-ac852fbbde11
+ 2020-12-10 422dc83baa database/sql: fix typo in comment
+ 2020-12-10 56b783ad94 cmd/go, cmd/asm: pass -linkshared to assembler for shared linkage builds
+ 2020-12-10 b110733327 cmd/link: reject too-large relocation addend on darwin/arm64
+ 2020-12-10 0aba8f24cb cmd/link: truncate file after code signature
+ 2020-12-10 6c64b6db68 cmd/compile: don't constant fold divide by zero
+ 2020-12-09 89f465c2b5 go/types: avoid endless recursion in the Comparable predicate
+ 2020-12-09 f1980efb92 all: update to use os.ReadDir where appropriate
+ 2020-12-09 4f1b0a44cb all: update to use os.ReadFile, os.WriteFile, os.CreateTemp, os.MkdirTemp
+ 2020-12-09 63bc23b545 [dev.regabi] cmd/compile: first start towards using Ident
+ 2020-12-09 eae8fd519b [dev.regabi] cmd/compile: iexport debug crumbs for toolstash
+ 2020-12-09 837b35cc55 [dev.regabi] cmd/compile: adjust IR representations
+ 2020-12-09 0c49440664 [dev.regabi] cmd/compile: arrange for walkstmt, walkexpr, to return from switch cases
+ 2020-12-09 4090af83c5 [dev.regabi] cmd/compile: use reflection in ir.Dump
+ 2020-12-09 e2d278bfeb [dev.regabi] cmd/compile: two small fixes
+ 2020-12-09 5627a4dc30 runtime/metrics: simplify test to support more environments
+ 2020-12-09 db6032dd0c cmd/compile: fix message typo
+ 2020-12-09 854a2f8e01 net/http: add connections back that haven't been canceled
+ 2020-12-09 6fa06d960b runtime: prevent stack growth after fork in runtime.sigfillset
+ 2020-12-09 ae9b442df2 doc: add description of new framepointer vet check
+ 2020-12-08 31496cfde5 cmd/vet: vendor in x/tools, enable framepointer vet check
+ 2020-12-08 01b76d5fbc go/types: correct error position for inherited const init expressions
+ 2020-12-08 48d6275952 doc/go1.16: improve channel race detector changes description
+ 2020-12-08 dbf2fc8cff [dev.regabi] cmd/compile: replace many uses of ir.Node with *ir.Name
+ 2020-12-08 bb31c75343 [dev.regabi] cmd/compile: ir.Node is no longer an ssa.Aux
+ 2020-12-08 6db970e20a [dev.regabi] cmd/compile: rewrite Aux uses of ir.Node to *ir.Name [generated]
+ 2020-12-08 1c8943a6ad [dev.regabi] cmd/compile: introduce FwdRefAux for wrapping ir.Node as ssa.Aux
+ 2020-12-08 9c91cab0da runtime: correct sigfwd on openbsd/mips64
+ 2020-12-08 dcec658f6c [dev.regabi] cmd/compile: change LocalSlot.N to *ir.Name
+ 2020-12-08 1a98ab0e2d [dev.regabi] cmd/compile: add ssa.Aux tag interface for Value.Aux
+ 2020-12-07 6362d01c15 doc/go1.16: update linker stats
+ 2020-12-07 9b8c272558 reflect: document multiple keys in struct tags
+ 2020-12-07 63722da46b [dev.regabi] cmd/compile: fix comment
+ 2020-12-07 7ad6596c47 io/fs: fix Sub method error text
+ 2020-12-07 6d783e7440 [dev.regabi] cmd/compile: export all Node fields [generated]
+ 2020-12-07 2de0af3b1b [dev.regabi] cmd/compile: prepare mknode for rename of Func.body
+ 2020-12-07 724374f859 [dev.regabi] cmd/compile: rewrite stale format strings
+ 2020-12-07 61889ba680 [dev.regabi] cmd/compile: simplify fmtmap
+ 2020-12-07 6ea2b8c54c [dev.regabi] cmd/compile: clean up and document formatting
+ 2020-12-07 bb4a37bd93 [dev.regabi] cmd/compile: move Type, Sym printing to package types [generated]
+ 2020-12-07 70155cca81 [dev.regabi] cmd/compile: untangle FmtFlag, FmtMode
+ 2020-12-07 3904a62829 [dev.regabi] cmd/compile: remove mode.Sprintf etc in printer
+ 2020-12-07 fb17dfa43d [dev.regabi] cmd/compile: narrow interface between ir and types
+ 2020-12-07 3b25f3c150 [dev.regabi] cmd/compile: simplify Op, Node, Nodes printing
+ 2020-12-07 8ce2605c5b [dev.regabi] cmd/compile: untangle ir.Dump printing
+ 2020-12-07 158c9dd131 [dev.regabi] cmd/compile: reorganize ir/fmt.go
+ 2020-12-07 a79742f39a [dev.regabi] cmd/compile: remove "short" node header mode
+ 2020-12-07 ef5964dd6b [dev.regabi] cmd/compile: arrange for typecheck1 to end in switch
+ 2020-12-07 dcc640e839 [dev.regabi] test: add exhaustive test of evaluated but not used
+ 2020-12-07 2cec6c4a8c [dev.regabi] cmd/compile: generate Node methods using program
+ 2020-12-07 50cdb2d8e9 runtime/cgo: fix building on musl
+ 2020-12-07 8d34585171 doc/go1.16: announce openbsd/mips64 port
+ 2020-12-07 9c0e2db051 test: add new test that gofrontend failed to handle
+ 2020-12-07 7f9a2bc2bc doc/go1.16: fix typo
+ 2020-12-07 ac0ba6707c doc/go1.16: add missing </a> tag
+ 2020-12-07 c155931974 internal/cpu: add darwin/arm64 CPU feature detection support
+ 2020-12-07 d90b199e9c [dev.regabi] cmd/compile: silence errors about missing blank methods
+ 2020-12-07 e10c94af26 doc/go1.16: document riscv64 port changes
+ 2020-12-06 e885df2731 [dev.regabi] cmd/compile: change iexport to avoid map[ir.Node]
+ 2020-12-06 2d4c95565a [dev.regabi] cmd/compile: change nowritebarrierrec to use map[*ir.Func]
+ 2020-12-06 1b5eed8982 [dev.regabi] cmd/compile: replace NodeQueue with NameQueue
+ 2020-12-06 6c5967e528 [dev.regabi] cmd/compile: change NodeSet to NameSet
+ 2020-12-05 3b2a578166 internal/cpu: fix typo in cpu_arm64.go
+ 2020-12-05 be9379f8a8 syscall: correct CertOpenStore to expect a 0 return value on failure
+ 2020-12-04 4de4480dc3 doc/go1.16: cleanup crypto release notes
+ 2020-12-04 0b99ea3b16 cmd/vendor: sync pprof@v0.0.0-20201203190320-1bf35d6f28c2
+ 2020-12-04 46b6e70e3b [dev.regabi] cmd/compile: replace ir.Node with *ir.Name in Order
+ 2020-12-04 b75f51c645 [dev.regabi] cmd/compile: replace ir.Node with *ir.Name in Liveness
+ 2020-12-04 133b03e1c3 [dev.regabi] cmd/compile: rewrite code to use DeclaredBy
+ 2020-12-04 d9cb84c84b [dev.regabi] cmd/compile: add SameSource, Uses, and DeclaredBy helpers
+ 2020-12-04 edf60be151 doc/go1.16: document no language changes
+ 2020-12-04 5dbd2e8e44 [dev.regabi] cmd/compile: remove DeepCopyNode interface
+ 2020-12-04 9ab3d854ad [dev.regabi] cmd/compile: avoid general traversal in deadcode
+ 2020-12-04 bb5aa2b664 [dev.regabi] cmd/compile: implement editChildren for nodes
+ 2020-12-04 4725c3ffd1 [dev.regabi] cmd/compile: implement doChildren for nodes
+ 2020-12-04 18f2df7e81 [dev.regabi] cmd/compile: implement copy for nodes
+ 2020-12-04 d855b30fe4 [dev.regabi] cmd/compile: use ir.EditChildren for inline rewriting
+ 2020-12-04 b9df26d7a8 [dev.regabi] cmd/compile: use ir.Find for "search" traversals
+ 2020-12-04 0d1b44c645 [dev.regabi] cmd/compile: introduce IR visitors
+ 2020-12-04 7fcf5b994c [dev.regabi] cmd/compile: replace inlcopy with ir.DeepCopy
+ 2020-12-04 989a3f5041 [dev.regabi] cmd/compile: adjustments to Copy and DeepCopy
+ 2020-12-04 99ecfcae31 [dev.regabi] cmd/compile: swap inlining order of if then vs else blocks
+ 2020-12-04 478bde3a43 io/fs: add Sub
+ 2020-12-04 5d4569197e cmd/go/internal/modload: fix minor errors in comments
+ 2020-12-04 21cfadf0dc runtime: avoid receiving preemotion signal while exec'ing
+ 2020-12-04 7358064508 doc/go1.16: preannounce dropping macOS 10.12 support
+ 2020-12-04 37588ffcb2 cmd/go, embed: exclude .* and _* from embedded directory trees
+ 2020-12-04 b67b7ddabc doc/go1.16: add reflect changes to release notes
+ 2020-12-04 cc386bd05a doc/go1.16: fix broken <code> tag
+ 2020-12-04 84cb51d7d7 [dev.regabi] cmd/compile: eliminate more SetOrig
+ 2020-12-04 2c2980aa0c doc/go1.16: pre-announce GODEBUG=x509ignoreCN=0 removal in Go 1.17
+ 2020-12-03 37a32a1833 cmd/compile: make sure address of offset(SP) is rematerializeable
+ 2020-12-03 b78b427be5 runtime, time: strictly enforce when, period constraints
+ 2020-12-03 b635e4b808 time, runtime: don't set timer when = 0
+ 2020-12-03 4eb7ceba06 doc/go1.16: update runtime and compiler sections
+ 2020-12-03 bacb307b80 test: match gofrontend error messages
+ 2020-12-03 7f5a3196c9 cmd/go/internal/modload: rename constants to reflect that lazy loading is not yet implemented
+ 2020-12-03 351bc2f38c [dev.regabi] cmd/compile: store types.Field on {Selector,CallPart}Expr
+ 2020-12-03 bdc9a837e9 doc/go1.16: add path, path/filepath changes to release notes
+ 2020-12-03 9b0e8a2c95 doc/go1.16: tidy darwin/arm64 port section
+ 2020-12-03 b1369d5862 math/big: remove the s390x assembly for shlVU and shrVU
+ 2020-12-03 a2058bac21 [dev.regabi] cmd/compile: add ConstExpr
+ 2020-12-03 beb5e05404 [dev.regabi] cmd/compile: refactoring prep for ConstExpr
+ 2020-12-03 7e81135be7 [dev.regabi] cmd/compile: rename addinit(n, init) to initExpr(init, n)
+ 2020-12-03 6e30fc10fc [dev.regabi] all: merge master (d0c0dc682c1f) into dev.regabi
+ 2020-12-03 dda2991c2e internal/cpu: disable FMA when OSXSAVE is not enabled on x86
+ 2020-12-03 58768ae15b test: match gccgo error messages
+ 2020-12-03 59b8916d48 [dev.regabi] cmd/compile: handle OCONVNOP better in ssa
+ 2020-12-03 932733d421 doc/go1.16: document embed, io/fs, runtime/metrics
+ 2020-12-03 c519b156fc doc/go1.16: more release notes
+ 2020-12-03 5246fa5e75 mime/multipart: handle ReadForm(math.MaxInt64) better
+ 2020-12-03 07cba70d57 cmd/compile, runtime: use __msan_memmove for moving data, split msanread to fields
+ 2020-12-03 d0c0dc682c doc/go1.16: document os package changes
+ 2020-12-03 00e5727790 [dev.regabi] cmd/compile: remove okAs
+ 2020-12-03 5a3b6796cd [dev.regabi] cmd/compile: remove extra typ field in Name struct
+ 2020-12-03 da54dfb6a1 doc/go1.16: document new behavior of asn1.Unmarshal on invalid argument
+ 2020-12-03 78e442ea79 doc/go1.16: add encoding/json note for tag change
+ 2020-12-02 f26f227f66 doc/go1.16: add crypto/tls Config.Clone note
+ 2020-12-02 64bc656aed [dev.regabi] cmd/compile: use explicit block statements for init
+ 2020-12-02 48838c35dc go/parser: ignore subdirectories in ParseDir
+ 2020-12-02 2d0258d495 crypto/ed25519/internal/edwards25519: fix typo in comments
+ 2020-12-02 ecc8d15bc5 [dev.regabi] cmd/compile: delete OEMPTY
+ 2020-12-02 ec5f349b22 [dev.regabi] cmd/compile: merge OBLOCK and OEMPTY
+ 2020-12-02 05ddb879c7 cmd/go: fix TestNewReleaseRebuildsStalePackagesInGOPATH
+ 2020-12-02 ac38af2f3d cmd/go: stop tests from using network during -short
+ 2020-12-02 3d913a9266 os: add ReadFile, WriteFile, CreateTemp (was TempFile), MkdirTemp (was TempDir) from io/ioutil
+ 2020-12-02 5984ea7197 doc: update signal.Notify example to use buffered channel
+ 2020-12-02 10240b9d6b cmd/go: fix unbuffered channel passed to signal.Notify
+ 2020-12-02 c32140fa94 all: update to use filepath.WalkDir instead of filepath.Walk
+ 2020-12-02 0433845ad1 cmd/asm, cmd/internal/obj/riscv: fix branch pseudo-instructions
+ 2020-12-02 c769d393de [dev.regabi] cmd/compile: add ir.NewDeclNameAt
+ 2020-12-02 c10b0ad628 [dev.regabi] cmd/compile: add Pkg parameter to type constructors
+ 2020-12-02 42e46f4ae0 [dev.regabi] cmd/compile: comment out //go:linkname warning
+ 2020-12-02 77a71e0057 [dev.regabi] cmd/compile: add Interface, Signature, and Struct constructors
+ 2020-12-02 15085f8974 [dev.regabi] cmd/compile: tweak hash bucket type descriptor
+ 2020-12-02 73e796cb00 test: match gofrontend error messages
+ 2020-12-01 cf7aa585ac cmd/link: invalidate kernel cache on darwin
+ 2020-12-01 8cd35e00bd cmd/internal/buildid: update Mach-O code signature when rewriting buildid
+ 2020-12-01 6f84993e90 cmd/link: code-sign on darwin/arm64
+ 2020-12-01 4826abb6c2 cmd/compile: do not assume TST and TEQ set V on arm
+ 2020-12-01 283d65413d encoding/json: revert "add "json: " prefix to SyntaxError messages"
+ 2020-12-01 1408d26ccc [dev.regabi] cmd/compile: cleanup some leftover cruft
+ 2020-12-01 7fca39aa05 cmd/internal/buildid: exclude Mach-O code signature in hash calculation
+ 2020-12-01 7430266af4 cmd/internal/codesign: new package
+ 2020-12-01 20e251864b cmd: update golang.org/x/mod to v0.4.0
+ 2020-12-01 933ce97bba cmd/go: don't print deprecation notice for 'go get exe'
+ 2020-12-01 50b16f9de5 net/http: allow upgrading non keepalive connections
+ 2020-12-01 212d385a2f net/http: ignore connection closes once done with the connection
+ 2020-12-01 4ef78b09c9 doc/go1.16: add runtime/debug changes to release notes
+ 2020-12-01 ae3bfba626 doc/go1.16: add text/template changes to release notes
+ 2020-12-01 5ffa275f3c [dev.regabi] cmd/compile: first pass at abstracting Type
+ 2020-12-01 dd4a52c2a5 doc/go1.16: add multiple release notes for the go command
+ 2020-12-01 6ca23a45fe [dev.regabi] cmd/compile: only save ONAMEs on Curfn.Dcl
+ 2020-12-01 a17c5e2fce [dev.regabi] cmd/compile: add NewBasic and cleanup universe
+ 2020-12-01 f37aa5e4e2 [dev.regabi] cmd/compile: add NewNamed
+ 2020-12-01 63a6f08b39 [dev.regabi] cmd/compile: move setUnderlying to package types
+ 2020-12-01 f2311462ab [dev.regabi] cmd/compile: cleanup type-checking of defined types
+ 2020-12-01 2d6ff998ed [dev.regabi] cmd/compile: process //go:linknames after declarations
+ 2020-12-01 ecff7628ea [dev.regabi] cmd/compile: unexport Node.RawCopy
+ 2020-12-01 4da41fb3f8 [dev.regabi] cmd/compile: use ir.Copy instead of direct use of RawCopy
+ 2020-12-01 dadfc80bc1 [dev.regabi] cmd/compile: improve findTypeLoop
+ 2020-12-01 f5978a0958 cmd/internal/obj/riscv: add tests for BGE/BGEU/BLT/BLTU
+ 2020-12-01 a36ba090fd cmd/link/internal/amd64: always generate R_X86_64_PLT32 for SDYNIMPORT calls
+ 2020-12-01 f3741bdf7c doc/go1.16: add crypto/x509 note about Verify on Windows
+ 2020-12-01 45f3b646d4 [dev.regabi] cmd/compile: add OSTMTEXPR Op
+ 2020-12-01 9a5a11adfa [dev.regabi] cmd/compile: add custom expression Node implementations
+ 2020-12-01 0ecf769633 cmd/compile: do not mark OpSP, OpSB pos for debugging
+ 2020-12-01 0f9f27287b [dev.regabi] cmd/compile: remove types.InitSyms
+ 2020-11-30 41ad4dec99 [dev.regabi] cmd/compile: fix -h
+ 2020-11-30 ffa68716a0 [dev.regabi] cmd/compile: add custom statement Node implementations
+ 2020-11-30 2bc814cd18 [dev.regabi] cmd/compile: clean up ONEW node
+ 2020-11-30 b7f67b75d2 [dev.regabi] cmd/compile: clean up in preparation for expression Nodes
+ 2020-11-30 5fc192af56 [dev.regabi] cmd/compile: clean up Order.copyExpr TODO
+ 2020-11-30 7c9b6b1ca2 [dev.regabi] cmd/compile: clean up in preparation for statement Nodes
+ 2020-11-30 7f688d18c0 runtime: mlock signal stack on macOS/ARM64
+ 2020-11-30 c6de5d8d1f [dev.regabi] cmd/compile: simplify export data representation of nil
+ 2020-11-30 d2b436d95d cmd/go: fix infinite loop in modload.keepSums
+ 2020-11-30 4f42a9b76b net: add note about disabling loopback in ListenMulticastUDP()
+ 2020-11-30 7b192f33cf cmd/go: remove trailing whitespace from test script
+ 2020-11-30 848dff6dda test: update gofrontend expected errors
+ 2020-11-30 a45e12fd4b test: recognize gofrontend error messages
+ 2020-11-30 d6abf298cf test: recognize new gofrontend error message
+ 2020-11-30 ae1a337809 [dev.regabi] cmd/compile: remove ODCLFIELD and ODDD ops
+ 2020-11-30 4e7685ef1a [dev.regabi] cmd/compile: add custom type syntax Node implementations
+ 2020-11-30 d40869fced [dev.regabi] cmd/compile: move gc.treecopy to ir.DeepCopy
+ 2020-11-30 f0001e8867 [dev.regabi] cmd/compile: add OTSLICE Op
+ 2020-11-30 1b84aabb01 [dev.regabi] cmd/compile: move typenod, typenodl to ir.TypeNode, ir.TypeNodeAt [generated]
+ 2020-11-30 e5c6463e20 [dev.regabi] cmd/compile: add ir.CallPartExpr
+ 2020-11-30 4eaef981b5 [dev.regabi] cmd/compile: add ir.Closure, ir.ClosureRead
+ 2020-11-30 e84b27bec5 [dev.regabi] cmd/compile: clean up Name and Func uses
+ 2020-11-30 c4bd0b7474 [dev.regabi] cmd/compile: make ir.Func the ODCLFUNC Node implementation
+ 2020-11-30 65ae15ac5d [dev.regabi] cmd/compile: move func code from node.go to func.go
+ 2020-11-30 862f638a89 [dev.regabi] cmd/compile: make ir.Name the ONAME Node implementation
+ 2020-11-30 f6106d195d [dev.regabi] cmd/compile: add ir.PkgName
+ 2020-11-30 420809ab08 [dev.regabi] cmd/compile: move name code from node.go to name.go
+ 2020-11-30 be3d8b40b5 [dev.regabi] cmd/compile: ir.BranchStmt, add ir.EmptyStmt, ir.LabelStmt
+ 2020-11-30 b09dbc6913 [dev.regabi] cmd/compile: remove SetOp(OEMPTY) calls
+ 2020-11-30 171787efcd [dev.regabi] cmd/compile: remove Orig, SetOrig from Node interface
+ 2020-11-30 79a3d5ce15 [dev.regabi] cmd/compile: setup for new Node implementations
+ 2020-11-30 0c65a2f317 [dev.regabi] cmd/compile: drop Node.HasOpt method
+ 2020-11-30 65f4ec2fae [dev.regabi] cmd/compile: cleanup label handling
+ 2020-11-30 c193279e2c os: return proper user directories on iOS
+ 2020-11-30 294c214cca runtime: gofmt
+ 2020-11-30 e5da18df52 os/exec: constrain thread usage in leaked descriptor test on illumos
+ 2020-11-28 4ce0a7cea6 runtime/pprof: ignore test failures on windows/arm
+ 2020-11-28 358d35455d bufio: make string(int) conversion safer
+ 2020-11-28 b94346e69b test: match gofrontend error messages
+ 2020-11-27 cb84d831c9 cmd/link: mark windows/arm as all PIE
+ 2020-11-27 0252cfd84d runtime: adjust address calculation in identifying abort on windows/arm
+ 2020-11-27 91f77ca2f8 runtime: return 0 from C function in test
+ 2020-11-26 926994fd7c log: make Default doc comment consistent with package doc
+ 2020-11-26 f0ff6d4a67 reflect: fix Value.Convert for int-to-string conversions (regression)
+ 2020-11-25 88e33f6ecb [dev.regabi] cmd/compile: fix latent import/export issue with break/continue
+ 2020-11-25 40f5bc4d55 [dev.regabi] merge master 4481ad6eb6 into dev.regabi
+ 2020-11-25 4481ad6eb6 doc/go1.16: consolidate stdlib changes in "Minor changes" section
+ 2020-11-25 ef603bead5 cmd/dist: restore GOARM=7 default for android/arm
+ 2020-11-25 41f3af9d04 [dev.regabi] cmd/compile: replace *Node type with an interface Node [generated]
+ 2020-11-25 4d0d9c2c5c [dev.regabi] cmd/compile: introduce ir.INode interface for *ir.Node
+ 2020-11-25 c26aead50c [dev.regabi] cmd/compile: convert types.Node (a pointer) to types.IRNode (an interface)
+ 2020-11-25 acb4d1cef1 [dev.regabi] cmd/compile: use Node getters and setters [generated]
+ 2020-11-25 41ab6689ed [dev.regabi] cmd/compile: rewrite a few ++/--/+=/-= to prep for getters/setters [generated]
+ 2020-11-25 048debb224 [dev.regabi] cmd/compile: remove gc ↔ ssa cycle hacks
+ 2020-11-25 84e2bd611f [dev.regabi] cmd/compile: introduce cmd/compile/internal/ir [generated]
+ 2020-11-25 331b8b4797 [dev.regabi] cmd/compile: move okforconst into its own declaration
+ 2020-11-25 26b66fd60b [dev.regabi] cmd/compile: introduce cmd/compile/internal/base [generated]
+ 2020-11-25 eb3086e5a8 [dev.regabi] cmd/compile: finish cleanup of Debug parsing
+ 2020-11-25 3c240f5d17 [dev.regabi] cmd/compile: clean up debug flag (-d) handling [generated]
+ 2020-11-25 9dc2350d8c doc/go1.16: add time/tzdata release note for CL 261877
+ 2020-11-25 756661c82a [dev.regabi] cmd/compile: finish cleanup of Flag initialization
+ 2020-11-25 b9365488f0 cmd/internal/objabi: assume GOARM=7 on Android
+ 2020-11-25 df68e01b68 runtime: check channel's elemsize before calling race detector
+ 2020-11-25 259fd8adbb [dev.regabi] cmd/compile: fix reporting of overflow
+ 2020-11-25 1d3baf20dc regexp/syntax: add note about Unicode character classes
+ 2020-11-25 18573aea3c [dev.regabi] cmd/compile: clean up flag handling [generated]
+ 2020-11-25 6e583d65ab [dev.regabi] cmd/compile: simplify fmt handling of Nodes
+ 2020-11-25 d166ef6876 [dev.regabi] cmd/compile: add Node field getters and setters
+ 2020-11-25 750b3729dc go/constant: MakeFloat64(0) must return a value of Float kind
+ 2020-11-25 9262909764 [dev.regabi] cmd/compile: rewrite problematic use of Node fields
+ 2020-11-25 9e0e43d84d [dev.regabi] cmd/compile: remove uses of dummy
+ 2020-11-25 4a6b4fd139 [dev.regabi] add FatalfAt and fix Fatalf docs
+ 2020-11-25 484449c641 [dev.regabi] cmd/compile: remove file mistakenly added by CL 272248
+ 2020-11-25 1308f11897 cmd/link: add relocation type R_AARCH64_LDST16_ABS_LO12_NC for arm64
+ 2020-11-25 f6dcc975f7 go/constant: make constant.Make produce "smallest" const representation
+ 2020-11-25 7d72951229 [dev.regabi] cmd/compile: replace Val with go/constant.Value
+ 2020-11-24 e8de596f04 runtime: use inlined function name for traceback elision
+ 2020-11-24 ba2adc21e8 runtime/testdata/testprogcgo: refactor CrashTraceback
+ 2020-11-24 6826287c6b [dev.regabi] cmd/compile: replace evconst with non-mutating version
+ 2020-11-24 c22bc745c3 [dev.regabi] cmd/compile: delete n.List after collapsing OADDSTR to OLITERAL
+ 2020-11-24 ee6132a698 [dev.regabi] cmd/compile: introduce OMETHEXPR instead of overloading ONAME
+ 2020-11-24 4f9d54e41d [dev.regabi] cmd/compile: add OMETHEXPR
+ 2020-11-24 fd11a32c92 [dev.regabi] cmd/compile: clean up Node.Func
+ 2020-11-24 8e2106327c [dev.regabi] cmd/compile: clean up tests to know less about Node
+ 2020-11-24 65dcd15c72 doc/go1.16: fill in Go 1.16 release note TODOs using relnote
+ 2020-11-24 742c05e3bc [dev.regabi] cmd/compile: prep refactoring for switching to go/constant
+ 2020-11-24 015423a15b [dev.regabi] strconv: add to bootstrap packages
+ 2020-11-24 c767d73227 [dev.regabi] cmd/compile: remove CTRUNE
+ 2020-11-24 6dae48fb0b [dev.regabi] cmd/compile: refactor type/value assertions
+ 2020-11-24 88a9e2f9ad [dev.regabi] cmd/compile: replace CTNIL with ONIL
+ 2020-11-24 4af2decf30 [dev.regabi] cmd/compile: add (unused) ONIL constant
+ 2020-11-24 668e3a598f [dev.regabi] cmd/compile: cleanup type switch typechecking
+ 2020-11-24 96f3fb7244 [dev.regabi] go/constant: avoid heap allocations in match
+ 2020-11-24 1abb12fc97 [dev.regabi] go/constant: optimize BitLen
+ 2020-11-24 228b732ad9 [dev.regabi] cmd/compile: prepare for package ir
+ 2020-11-24 e37597f7f0 [dev.regabi] cmd/compile: rename a few 'base' identifiers
+ 2020-11-24 357c576878 [dev.regabi] cmd/compile: clean up error API
+ 2020-11-24 5fd949e4bd [dev.regabi] cmd/compile: initialize importMap lazily
+ 2020-11-24 7b144ed4f7 [dev.regabi] cmd/compile: rewrite concurrentFlagOk to be clearer
+ 2020-11-24 6965b01ea2 runtime: allow for usleep2HighRes to run without TLS setup
+ 2020-11-24 7dc5d909fb cmd/compile: set OpLoad argument type interface{} correctly
+ 2020-11-24 c754f25241 [dev.regabi] cmd/compile/internal/types: remove Func.Nname
+ 2020-11-24 c50c7a8c06 [dev.regabi] cmd/compile/internal/gc: refactor to use stop using Func.Nname
+ 2020-11-24 d5928847de [dev.regabi] cmd/compile/internal/gc: prep for Func.Nname removal refactoring
+ 2020-11-24 b30c7a8044 [dev.regabi] cmd/compile/internal/gc: add MethodName for getting referenced method
+ 2020-11-24 e1047302bd [dev.regabi] cmd/compile/internal/types: add pos/sym/typ params to NewField
+ 2020-11-24 762eda346a go/types: fix incorrect string(int) conversion (regression)
+ 2020-11-23 48a1a51898 runtime/metrics: tweak wording of stack and unused memory metrics
+ 2020-11-23 d902791b50 sync: use 386 instead of x86-32 to refer to the 32 bit x86 architecture
+ 2020-11-21 9ea6364a5e cmd/compile: add test for 42753
+ 2020-11-21 f7342596da syscall: add DLLError.Unwrap function
+ 2020-11-21 f93ef07b11 cmd/go/internal/modload: remove the Reqs function
+ 2020-11-21 3f5a97514b cmd/go/internal/modload: remove a stale comment for EditBuildList
+ 2020-11-20 78e59bb1f7 cmd/go: support the -overlay flag for go mod commands
+ 2020-11-20 c47eac7db0 cmd/cgo, cmd/internal/pkgpath: support gofrontend mangler v3
+ 2020-11-20 3fd4917472 doc: fix misspelling of “initialization” in diagnostics.html
+ 2020-11-20 676f0a45ed cmd/go: support overlaying go.mod files
+ 2020-11-20 a19c925eda cmd/go: recommend 'go get' command to switch from retracted versions
+ 2020-11-20 c306fd6d0b cmd/compile: allow loading single field of typed-interface{} OpIData
+ 2020-11-20 5e58ae43be cmd/go: report changes and resolved versions in 'go get'
+ 2020-11-20 012efc67f2 cmd/go/internal/modload: ignore selected version in checkRetractions
+ 2020-11-20 9264067a41 cmd/go: remove ListModules call in runGet
+ 2020-11-20 cb3f84ad25 cmd/go/internal/modload: eliminate LoadedModules
+ 2020-11-20 8bbd8294d0 cmd/go/internal/work: remove a redundant call to modload.LoadedModules
+ 2020-11-20 66c0264506 net, internal/poll: reset value before adding in minor kernel version
+ 2020-11-20 0dcc7d6ea8 go/types: use correct error position
+ 2020-11-20 c72a448881 go/types: fix error message for consistency
+ 2020-11-20 7eed73f36f go/types, go/constant: handle infinities as unknown values
+ 2020-11-19 f3ce010b33 io/fs: make WalkDirFunc parameter name consistent with doc comment
+ 2020-11-19 59f5fdac5d runtime/metrics: clarify Read's documentation
+ 2020-11-19 add45938b5 runtime/metrics: clarify memory and GC metrics documentation
+ 2020-11-19 498d8d5371 cmd/go/internal/work: avoid modload.Selected in 'go install pkg@version'
+ 2020-11-19 e73697b710 cmd/go: fix failing gccgo cases in TestScript/build_overlay
+ 2020-11-19 cb674b5c13 cmd/compile,cmd/asm: fix function pointer call perf regression on ppc64
+ 2020-11-19 c31540364c cmd/compile:  flag "-d=dumpptrs" to print Node ptrs in Dump output
+ 2020-11-19 4d048194cd runtime: support new callbackasm1 calling convention on windows/arm
+ 2020-11-19 5ba1c3f290 cmd/go/internal/modload: remove SetBuildList
+ 2020-11-19 ff2824d4b3 cmd/go/internal/modcmd: eliminate a call to modload.LoadedModules
+ 2020-11-19 0bb6115dd6 internal/fmtsort: sort the unsafe pointers in map
+ 2020-11-19 96b943a483 go/types: report an error for invalid constant values
+ 2020-11-18 35693d037f cmd/compile: fix miscompilation during inlining
+ 2020-11-18 5b0ec1a6ac cmd/compile: fix panic in field tracking logic
+ 2020-11-18 b4f3d52f6a sync: document RWMutex race semantics
+ 2020-11-18 b63db7f724 runtime: give test child time to block
+ 2020-11-18 ae76f6e962 runtime: use clock_gettime instead of gettimeofday on darwin
+ 2020-11-18 ee1b51294a runtime: use pipe2 syscall for Pipe in tests
+ 2020-11-18 d3072b8383 cmd/go: in 'go get', only load retractions for resolved versions
+ 2020-11-18 b194b5151f cmd/link: recompute heapPos after copyHeap
+ 2020-11-18 64ef84881f cmd/go: fix retract interval syntax in 'go help mod edit'
+ 2020-11-18 399b5d14d4 cmd/compile: stop MOVW-ing -1 as SRA shift amount in mips
+ 2020-11-18 a14e7bf6d4 go/ast: document invalid comment end positions with CRLF line endings
+ 2020-11-18 bcfaeca58c time: in NewTicker, document that the 1st tick comes after d
+ 2020-11-17 041a4e4c34 go/types: add test case for incorrect map index expression
+ 2020-11-17 05082c90d5 cmd/compile: clean up buggy DWARF inlined info PC ranges
+ 2020-11-17 01df2febf5 cmd/go: allow querying other versions of the main module
+ 2020-11-17 0968d2d599 cmd/go/internal/modget: clarify error for 'go get' without arguments
+ 2020-11-17 3e56bad13b cmd/go: revert "in 'go get', only load retractions for resolved versions"
+ 2020-11-17 0ae3b7cb74 cmd/compile: fix rules regression with shifts on PPC64
+ 2020-11-16 869e2957b9 cmd/go: update 'go help mod init'
+ 2020-11-16 97700baf8b cmd/go: in 'go get', only load retractions for resolved versions
+ 2020-11-16 38367d098e cmd/link/internal/ld: dedup shared libraries on openbsd
+ 2020-11-16 d834ecec86 runtime/race: reject runtime fatal error in tests
+ 2020-11-16 0932dc2118 runtime: declare arg size/map for race version of sync/atomic functions
+ 2020-11-16 d70a33a40b cmd/go/internal/work: add missing newline to go version note
+ 2020-11-16 c7233dd063 cmd/go: permit wrongly rejected -Wl,-O... linker flags
+ 2020-11-16 f2eea4c1dc cmd/compile: mask SLL,SRL,SRAconst shift amount
+ 2020-11-14 92c732e901 cmd/compile: fix load of interface{}-typed OpIData in expand_calls
+ 2020-11-14 782cf560db cmd/go: permit CGO_LDFLAGS to appear in //go:ldflag
+ 2020-11-13 4f63e0a1f8 cmd/compile:  update comments only for Node types and some functions
+ 2020-11-13 86954d5246 cmd/compile: mark plugin-exported types as used in interface
+ 2020-11-13 f423d616b1 cmd/cgo: fix initialization of empty argument types
+ 2020-11-13 35455fff0e runtime: swap the order of raceacquire() and racerelease()
+ 2020-11-13 31f71506d7 syscall: use correct type for TIOCSPGRP/TIOCGPGRP
+ 2020-11-12 30ba798093 cmd/go: use overlaid path contents in build cache
+ 2020-11-12 f016172dbe cmd/go: pass in overlaid paths for .s files
+ 2020-11-12 60b1253293 cmd/go: pass in overlaid file paths to C compiler
+ 2020-11-12 062e0e5ce6 cmd/go, cmd/cgo: don't let bogus symbol set cgo_ldflag
+ 2020-11-12 1e1fa5903b math/big: fix shift for recursive division
+ 2020-11-12 b34b0aaf69 cmd/go: skip TestScript/build_plugin_non_main on platforms that do not support -buildmode=plugin
+ 2020-11-12 c167635a6e cmd/compile: gofmt
+ 2020-11-12 e75aef80ca cmd/go: migrate away from semver.Max
+ 2020-11-12 9ef65ff137 cmd/compile: do not emit an extra debug_line entry for the end of seq addr
+ 2020-11-12 4bc5f6f45f cmd/link: put DYLD_INFO at beginning of LINKEDIT segment on darwin
+ 2020-11-12 d7974c31d0 os: gofmt
+ 2020-11-11 141fa337ad bytes: add example for (*Buffer).Bytes
+ 2020-11-11 f2e58c6d42 syscall: improve TestSetuidEtc() /proc/ parsing against races
+ 2020-11-11 4c174a7ba6 testing: reduce memory allocation in Helper
+ 2020-11-11 b641f0dcf4 os: clarify that IsExist and friends do not use errors.Is
+ 2020-11-11 26a860706a doc/go1.16: add crypto/x509 CSR release note
+ 2020-11-11 28437546f4 cmd/go: don't copy cgo files to objdir when overlay is present
+ 2020-11-11 c906608406 io/fs: fix reference to WalkFunc
+ 2020-11-11 f2e186b877 all: update vendored dependencies for Go 1.16 release
+ 2020-11-10 8f2db14cd3 cmd/go: release note for -mod=readonly by default
+ 2020-11-10 b2ef159db2 cmd/go: introduce the GOVERSION env variable
+ 2020-11-10 1948c00b6e doc/go1.16: add release notes for darwin ports
+ 2020-11-10 da3957ad0d Revert "cmd/go: don't copy cgo files to objdir when overlay is present"
+ 2020-11-10 0e0a872a76 runtime: add lock rank partial order edge pollDesc -> spanSetSpine
+ 2020-11-10 c68745b130 runtime: add lock rank partial order edge sweep -> mspanSpecial
+ 2020-11-10 e3de852f3e cmd/go: don't copy cgo files to objdir when overlay is present
+ 2020-11-10 189931296f cmd/internal/obj/s390x: fix SYNC instruction encoding
+ 2020-11-10 81322b9191 runtime/race: remove race from TestNoRaceAfterFunc2
+ 2020-11-10 1c7650aa93 internal/poll: use copy_file_range only on Linux kernel >= 5.3
+ 2020-11-10 1642cd78b5 cmd/go: update test_race_install expected output for CL 266368

Change-Id: I7ce5350ac9d0647236f1061a540c6751fb9faae9

36 files changed, 1260 insertions, 223 deletions

diff --git a/src/cmd/internal/archive/archive.go b/src/cmd/internal/archive/archive.go
index c1661d7711..e9b25fe240 100644
--- a/src/cmd/internal/archive/archive.go
+++ b/src/cmd/internal/archive/archive.go
@@ -118,9 +118,9 @@ type objReader struct {
 
 func (r *objReader) init(f *os.File) {
 	r.a = &Archive{f, nil}
-	r.offset, _ = f.Seek(0, io.SeekCurrent)
-	r.limit, _ = f.Seek(0, io.SeekEnd)
-	f.Seek(r.offset, io.SeekStart)
+	r.offset, _ = f.Seek(0, os.SEEK_CUR)
+	r.limit, _ = f.Seek(0, os.SEEK_END)
+	f.Seek(r.offset, os.SEEK_SET)
 	r.b = bio.NewReader(f)
 }
 
@@ -221,7 +221,7 @@ func (r *objReader) skip(n int64) {
 		r.readFull(r.tmp[:n])
 	} else {
 		// Seek, giving up buffered data.
-		r.b.MustSeek(r.offset+n, io.SeekStart)
+		r.b.MustSeek(r.offset+n, os.SEEK_SET)
 		r.offset += n
 	}
 }
@@ -426,7 +426,7 @@ func (r *objReader) parseObject(o *GoObj, size int64) error {
 
 // AddEntry adds an entry to the end of a, with the content from r.
 func (a *Archive) AddEntry(typ EntryType, name string, mtime int64, uid, gid int, mode os.FileMode, size int64, r io.Reader) {
-	off, err := a.f.Seek(0, io.SeekEnd)
+	off, err := a.f.Seek(0, os.SEEK_END)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -464,3 +464,24 @@ func exactly16Bytes(s string) string {
 	s += sixteenSpaces[:16-len(s)]
 	return s
 }
+
+// architecture-independent object file output
+const HeaderSize = 60
+
+func ReadHeader(b *bufio.Reader, name string) int {
+	var buf [HeaderSize]byte
+	if _, err := io.ReadFull(b, buf[:]); err != nil {
+		return -1
+	}
+	aname := strings.Trim(string(buf[0:16]), " ")
+	if !strings.HasPrefix(aname, name) {
+		return -1
+	}
+	asize := strings.Trim(string(buf[48:58]), " ")
+	i, _ := strconv.Atoi(asize)
+	return i
+}
+
+func FormatHeader(arhdr []byte, name string, size int64) {
+	copy(arhdr[:], fmt.Sprintf("%-16s%-12d%-6d%-6d%-8o%-10d`\n", name, 0, 0, 0, 0644, size))
+}
diff --git a/src/cmd/internal/browser/browser.go b/src/cmd/internal/browser/browser.go
index 6867c85d23..577d31789f 100644
--- a/src/cmd/internal/browser/browser.go
+++ b/src/cmd/internal/browser/browser.go
@@ -6,8 +6,8 @@
 package browser
 
 import (
+	exec "internal/execabs"
 	"os"
-	"os/exec"
 	"runtime"
 	"time"
 )
diff --git a/src/cmd/internal/buildid/buildid_test.go b/src/cmd/internal/buildid/buildid_test.go
index 904c2c6f37..e832f9987e 100644
--- a/src/cmd/internal/buildid/buildid_test.go
+++ b/src/cmd/internal/buildid/buildid_test.go
@@ -11,6 +11,7 @@ import (
 	"io/ioutil"
 	"os"
 	"reflect"
+	"strings"
 	"testing"
 )
 
@@ -146,3 +147,33 @@ func TestFindAndHash(t *testing.T) {
 		}
 	}
 }
+
+func TestExcludedReader(t *testing.T) {
+	const s = "0123456789abcdefghijklmn"
+	tests := []struct {
+		start, end int64    // excluded range
+		results    []string // expected results of reads
+	}{
+		{12, 15, []string{"0123456789", "ab\x00\x00\x00fghij", "klmn"}},                              // within one read
+		{8, 21, []string{"01234567\x00\x00", "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", "\x00lmn"}}, // across multiple reads
+		{10, 20, []string{"0123456789", "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", "klmn"}},         // a whole read
+		{0, 5, []string{"\x00\x00\x00\x00\x0056789", "abcdefghij", "klmn"}},                          // start
+		{12, 24, []string{"0123456789", "ab\x00\x00\x00\x00\x00\x00\x00\x00", "\x00\x00\x00\x00"}},   // end
+	}
+	p := make([]byte, 10)
+	for _, test := range tests {
+		r := &excludedReader{strings.NewReader(s), 0, test.start, test.end}
+		for _, res := range test.results {
+			n, err := r.Read(p)
+			if err != nil {
+				t.Errorf("read failed: %v", err)
+			}
+			if n != len(res) {
+				t.Errorf("unexpected number of bytes read: want %d, got %d", len(res), n)
+			}
+			if string(p[:n]) != res {
+				t.Errorf("unexpected bytes: want %q, got %q", res, p[:n])
+			}
+		}
+	}
+}
diff --git a/src/cmd/internal/buildid/rewrite.go b/src/cmd/internal/buildid/rewrite.go
index 5be54552a6..a7928959c4 100644
--- a/src/cmd/internal/buildid/rewrite.go
+++ b/src/cmd/internal/buildid/rewrite.go
@@ -6,7 +6,9 @@ package buildid
 
 import (
 	"bytes"
+	"cmd/internal/codesign"
 	"crypto/sha256"
+	"debug/macho"
 	"fmt"
 	"io"
 )
@@ -26,6 +28,11 @@ func FindAndHash(r io.Reader, id string, bufSize int) (matches []int64, hash [32
 	zeros := make([]byte, len(id))
 	idBytes := []byte(id)
 
+	// For Mach-O files, we want to exclude the code signature.
+	// The code signature contains hashes of the whole file (except the signature
+	// itself), including the buildid. So the buildid cannot contain the signature.
+	r = excludeMachoCodeSignature(r)
+
 	// The strategy is to read the file through buf, looking for id,
 	// but we need to worry about what happens if id is broken up
 	// and returned in parts by two different reads.
@@ -87,5 +94,69 @@ func Rewrite(w io.WriterAt, pos []int64, id string) error {
 			return err
 		}
 	}
+
+	// Update Mach-O code signature, if any.
+	if f, cmd, ok := findMachoCodeSignature(w); ok {
+		if codesign.Size(int64(cmd.Dataoff), "a.out") == int64(cmd.Datasize) {
+			// Update the signature if the size matches, so we don't need to
+			// fix up headers. Binaries generated by the Go linker should have
+			// the expected size. Otherwise skip.
+			text := f.Segment("__TEXT")
+			cs := make([]byte, cmd.Datasize)
+			codesign.Sign(cs, w.(io.Reader), "a.out", int64(cmd.Dataoff), int64(text.Offset), int64(text.Filesz), f.Type == macho.TypeExec)
+			if _, err := w.WriteAt(cs, int64(cmd.Dataoff)); err != nil {
+				return err
+			}
+		}
+	}
+
 	return nil
 }
+
+func excludeMachoCodeSignature(r io.Reader) io.Reader {
+	_, cmd, ok := findMachoCodeSignature(r)
+	if !ok {
+		return r
+	}
+	return &excludedReader{r, 0, int64(cmd.Dataoff), int64(cmd.Dataoff + cmd.Datasize)}
+}
+
+// excludedReader wraps an io.Reader. Reading from it returns the bytes from
+// the underlying reader, except that when the byte offset is within the
+// range between start and end, it returns zero bytes.
+type excludedReader struct {
+	r          io.Reader
+	off        int64 // current offset
+	start, end int64 // the range to be excluded (read as zero)
+}
+
+func (r *excludedReader) Read(p []byte) (int, error) {
+	n, err := r.r.Read(p)
+	if n > 0 && r.off+int64(n) > r.start && r.off < r.end {
+		cstart := r.start - r.off
+		if cstart < 0 {
+			cstart = 0
+		}
+		cend := r.end - r.off
+		if cend > int64(n) {
+			cend = int64(n)
+		}
+		zeros := make([]byte, cend-cstart)
+		copy(p[cstart:cend], zeros)
+	}
+	r.off += int64(n)
+	return n, err
+}
+
+func findMachoCodeSignature(r interface{}) (*macho.File, codesign.CodeSigCmd, bool) {
+	ra, ok := r.(io.ReaderAt)
+	if !ok {
+		return nil, codesign.CodeSigCmd{}, false
+	}
+	f, err := macho.NewFile(ra)
+	if err != nil {
+		return nil, codesign.CodeSigCmd{}, false
+	}
+	cmd, ok := codesign.FindCodeSigCmd(f)
+	return f, cmd, ok
+}
diff --git a/src/cmd/internal/codesign/codesign.go b/src/cmd/internal/codesign/codesign.go
new file mode 100644
index 0000000000..0517a10640
--- /dev/null
+++ b/src/cmd/internal/codesign/codesign.go
@@ -0,0 +1,268 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package codesign provides basic functionalities for
+// ad-hoc code signing of Mach-O files.
+//
+// This is not a general tool for code-signing. It is made
+// specifically for the Go toolchain. It uses the same
+// ad-hoc signing algorithm as the Darwin linker.
+package codesign
+
+import (
+	"crypto/sha256"
+	"debug/macho"
+	"encoding/binary"
+	"io"
+)
+
+// Code signature layout.
+//
+// The code signature is a block of bytes that contains
+// a SuperBlob, which contains one or more Blobs. For ad-hoc
+// signing, a single CodeDirectory Blob suffices.
+//
+// A SuperBlob starts with its header (the binary representation
+// of the SuperBlob struct), followed by a list of (in our case,
+// one) Blobs (offset and size). A CodeDirectory Blob starts
+// with its head (the binary representation of CodeDirectory struct),
+// followed by the identifier (as a C string) and the hashes, at
+// the corresponding offsets.
+//
+// The signature data must be included in the __LINKEDIT segment.
+// In the Mach-O file header, an LC_CODE_SIGNATURE load command
+// points to the data.
+
+const (
+	pageSizeBits = 12
+	pageSize     = 1 << pageSizeBits
+)
+
+const LC_CODE_SIGNATURE = 0x1d
+
+// Constants and struct layouts are from
+// https://opensource.apple.com/source/xnu/xnu-4903.270.47/osfmk/kern/cs_blobs.h
+
+const (
+	CSMAGIC_REQUIREMENT        = 0xfade0c00 // single Requirement blob
+	CSMAGIC_REQUIREMENTS       = 0xfade0c01 // Requirements vector (internal requirements)
+	CSMAGIC_CODEDIRECTORY      = 0xfade0c02 // CodeDirectory blob
+	CSMAGIC_EMBEDDED_SIGNATURE = 0xfade0cc0 // embedded form of signature data
+	CSMAGIC_DETACHED_SIGNATURE = 0xfade0cc1 // multi-arch collection of embedded signatures
+
+	CSSLOT_CODEDIRECTORY = 0 // slot index for CodeDirectory
+)
+
+const (
+	CS_HASHTYPE_SHA1             = 1
+	CS_HASHTYPE_SHA256           = 2
+	CS_HASHTYPE_SHA256_TRUNCATED = 3
+	CS_HASHTYPE_SHA384           = 4
+)
+
+const (
+	CS_EXECSEG_MAIN_BINARY     = 0x1   // executable segment denotes main binary
+	CS_EXECSEG_ALLOW_UNSIGNED  = 0x10  // allow unsigned pages (for debugging)
+	CS_EXECSEG_DEBUGGER        = 0x20  // main binary is debugger
+	CS_EXECSEG_JIT             = 0x40  // JIT enabled
+	CS_EXECSEG_SKIP_LV         = 0x80  // skip library validation
+	CS_EXECSEG_CAN_LOAD_CDHASH = 0x100 // can bless cdhash for execution
+	CS_EXECSEG_CAN_EXEC_CDHASH = 0x200 // can execute blessed cdhash
+)
+
+type Blob struct {
+	typ    uint32 // type of entry
+	offset uint32 // offset of entry
+	// data follows
+}
+
+func (b *Blob) put(out []byte) []byte {
+	out = put32be(out, b.typ)
+	out = put32be(out, b.offset)
+	return out
+}
+
+const blobSize = 2 * 4
+
+type SuperBlob struct {
+	magic  uint32 // magic number
+	length uint32 // total length of SuperBlob
+	count  uint32 // number of index entries following
+	// blobs []Blob
+}
+
+func (s *SuperBlob) put(out []byte) []byte {
+	out = put32be(out, s.magic)
+	out = put32be(out, s.length)
+	out = put32be(out, s.count)
+	return out
+}
+
+const superBlobSize = 3 * 4
+
+type CodeDirectory struct {
+	magic         uint32 // magic number (CSMAGIC_CODEDIRECTORY)
+	length        uint32 // total length of CodeDirectory blob
+	version       uint32 // compatibility version
+	flags         uint32 // setup and mode flags
+	hashOffset    uint32 // offset of hash slot element at index zero
+	identOffset   uint32 // offset of identifier string
+	nSpecialSlots uint32 // number of special hash slots
+	nCodeSlots    uint32 // number of ordinary (code) hash slots
+	codeLimit     uint32 // limit to main image signature range
+	hashSize      uint8  // size of each hash in bytes
+	hashType      uint8  // type of hash (cdHashType* constants)
+	_pad1         uint8  // unused (must be zero)
+	pageSize      uint8  // log2(page size in bytes); 0 => infinite
+	_pad2         uint32 // unused (must be zero)
+	scatterOffset uint32
+	teamOffset    uint32
+	_pad3         uint32
+	codeLimit64   uint64
+	execSegBase   uint64
+	execSegLimit  uint64
+	execSegFlags  uint64
+	// data follows
+}
+
+func (c *CodeDirectory) put(out []byte) []byte {
+	out = put32be(out, c.magic)
+	out = put32be(out, c.length)
+	out = put32be(out, c.version)
+	out = put32be(out, c.flags)
+	out = put32be(out, c.hashOffset)
+	out = put32be(out, c.identOffset)
+	out = put32be(out, c.nSpecialSlots)
+	out = put32be(out, c.nCodeSlots)
+	out = put32be(out, c.codeLimit)
+	out = put8(out, c.hashSize)
+	out = put8(out, c.hashType)
+	out = put8(out, c._pad1)
+	out = put8(out, c.pageSize)
+	out = put32be(out, c._pad2)
+	out = put32be(out, c.scatterOffset)
+	out = put32be(out, c.teamOffset)
+	out = put32be(out, c._pad3)
+	out = put64be(out, c.codeLimit64)
+	out = put64be(out, c.execSegBase)
+	out = put64be(out, c.execSegLimit)
+	out = put64be(out, c.execSegFlags)
+	return out
+}
+
+const codeDirectorySize = 13*4 + 4 + 4*8
+
+// CodeSigCmd is Mach-O LC_CODE_SIGNATURE load command.
+type CodeSigCmd struct {
+	Cmd      uint32 // LC_CODE_SIGNATURE
+	Cmdsize  uint32 // sizeof this command (16)
+	Dataoff  uint32 // file offset of data in __LINKEDIT segment
+	Datasize uint32 // file size of data in __LINKEDIT segment
+}
+
+func FindCodeSigCmd(f *macho.File) (CodeSigCmd, bool) {
+	get32 := f.ByteOrder.Uint32
+	for _, l := range f.Loads {
+		data := l.Raw()
+		cmd := get32(data)
+		if cmd == LC_CODE_SIGNATURE {
+			return CodeSigCmd{
+				cmd,
+				get32(data[4:]),
+				get32(data[8:]),
+				get32(data[12:]),
+			}, true
+		}
+	}
+	return CodeSigCmd{}, false
+}
+
+func put32be(b []byte, x uint32) []byte { binary.BigEndian.PutUint32(b, x); return b[4:] }
+func put64be(b []byte, x uint64) []byte { binary.BigEndian.PutUint64(b, x); return b[8:] }
+func put8(b []byte, x uint8) []byte     { b[0] = x; return b[1:] }
+func puts(b, s []byte) []byte           { n := copy(b, s); return b[n:] }
+
+// Size computes the size of the code signature.
+// id is the identifier used for signing (a field in CodeDirectory blob, which
+// has no significance in ad-hoc signing).
+func Size(codeSize int64, id string) int64 {
+	nhashes := (codeSize + pageSize - 1) / pageSize
+	idOff := int64(codeDirectorySize)
+	hashOff := idOff + int64(len(id)+1)
+	cdirSz := hashOff + nhashes*sha256.Size
+	return int64(superBlobSize+blobSize) + cdirSz
+}
+
+// Sign generates an ad-hoc code signature and writes it to out.
+// out must have length at least Size(codeSize, id).
+// data is the file content without the signature, of size codeSize.
+// textOff and textSize is the file offset and size of the text segment.
+// isMain is true if this is a main executable.
+// id is the identifier used for signing (a field in CodeDirectory blob, which
+// has no significance in ad-hoc signing).
+func Sign(out []byte, data io.Reader, id string, codeSize, textOff, textSize int64, isMain bool) {
+	nhashes := (codeSize + pageSize - 1) / pageSize
+	idOff := int64(codeDirectorySize)
+	hashOff := idOff + int64(len(id)+1)
+	sz := Size(codeSize, id)
+
+	// emit blob headers
+	sb := SuperBlob{
+		magic:  CSMAGIC_EMBEDDED_SIGNATURE,
+		length: uint32(sz),
+		count:  1,
+	}
+	blob := Blob{
+		typ:    CSSLOT_CODEDIRECTORY,
+		offset: superBlobSize + blobSize,
+	}
+	cdir := CodeDirectory{
+		magic:        CSMAGIC_CODEDIRECTORY,
+		length:       uint32(sz) - (superBlobSize + blobSize),
+		version:      0x20400,
+		flags:        0x20002, // adhoc | linkerSigned
+		hashOffset:   uint32(hashOff),
+		identOffset:  uint32(idOff),
+		nCodeSlots:   uint32(nhashes),
+		codeLimit:    uint32(codeSize),
+		hashSize:     sha256.Size,
+		hashType:     CS_HASHTYPE_SHA256,
+		pageSize:     uint8(pageSizeBits),
+		execSegBase:  uint64(textOff),
+		execSegLimit: uint64(textSize),
+	}
+	if isMain {
+		cdir.execSegFlags = CS_EXECSEG_MAIN_BINARY
+	}
+
+	outp := out
+	outp = sb.put(outp)
+	outp = blob.put(outp)
+	outp = cdir.put(outp)
+
+	// emit the identifier
+	outp = puts(outp, []byte(id+"\000"))
+
+	// emit hashes
+	var buf [pageSize]byte
+	h := sha256.New()
+	p := 0
+	for p < int(codeSize) {
+		n, err := io.ReadFull(data, buf[:])
+		if err == io.EOF {
+			break
+		}
+		if err != nil && err != io.ErrUnexpectedEOF {
+			panic(err)
+		}
+		if p+n > int(codeSize) {
+			n = int(codeSize) - p
+		}
+		p += n
+		h.Reset()
+		h.Write(buf[:n])
+		b := h.Sum(nil)
+		outp = puts(outp, b[:])
+	}
+}
diff --git a/src/cmd/internal/diff/diff.go b/src/cmd/internal/diff/diff.go
index e9d2c23780..c0ca2f3106 100644
--- a/src/cmd/internal/diff/diff.go
+++ b/src/cmd/internal/diff/diff.go
@@ -7,9 +7,9 @@
 package diff
 
 import (
+	exec "internal/execabs"
 	"io/ioutil"
 	"os"
-	"os/exec"
 	"runtime"
 )
 
diff --git a/src/cmd/internal/dwarf/dwarf.go b/src/cmd/internal/dwarf/dwarf.go
index b2fd5262bb..8de4096f06 100644
--- a/src/cmd/internal/dwarf/dwarf.go
+++ b/src/cmd/internal/dwarf/dwarf.go
@@ -12,7 +12,7 @@ import (
 	"cmd/internal/objabi"
 	"errors"
 	"fmt"
-	"os/exec"
+	exec "internal/execabs"
 	"sort"
 	"strconv"
 	"strings"
@@ -101,26 +101,26 @@ func EnableLogging(doit bool) {
 	logDwarf = doit
 }
 
-// UnifyRanges merges the list of ranges of c into the list of ranges of s
-func (s *Scope) UnifyRanges(c *Scope) {
-	out := make([]Range, 0, len(s.Ranges)+len(c.Ranges))
-
+// MergeRanges creates a new range list by merging the ranges from
+// its two arguments, then returns the new list.
+func MergeRanges(in1, in2 []Range) []Range {
+	out := make([]Range, 0, len(in1)+len(in2))
 	i, j := 0, 0
 	for {
 		var cur Range
-		if i < len(s.Ranges) && j < len(c.Ranges) {
-			if s.Ranges[i].Start < c.Ranges[j].Start {
-				cur = s.Ranges[i]
+		if i < len(in2) && j < len(in1) {
+			if in2[i].Start < in1[j].Start {
+				cur = in2[i]
 				i++
 			} else {
-				cur = c.Ranges[j]
+				cur = in1[j]
 				j++
 			}
-		} else if i < len(s.Ranges) {
-			cur = s.Ranges[i]
+		} else if i < len(in2) {
+			cur = in2[i]
 			i++
-		} else if j < len(c.Ranges) {
-			cur = c.Ranges[j]
+		} else if j < len(in1) {
+			cur = in1[j]
 			j++
 		} else {
 			break
@@ -133,7 +133,12 @@ func (s *Scope) UnifyRanges(c *Scope) {
 		}
 	}
 
-	s.Ranges = out
+	return out
+}
+
+// UnifyRanges merges the ranges from 'c' into the list of ranges for 's'.
+func (s *Scope) UnifyRanges(c *Scope) {
+	s.Ranges = MergeRanges(s.Ranges, c.Ranges)
 }
 
 // AppendRange adds r to s, if r is non-empty.
diff --git a/src/cmd/internal/goobj/mkbuiltin.go b/src/cmd/internal/goobj/mkbuiltin.go
index 07c3406681..22608e7e69 100644
--- a/src/cmd/internal/goobj/mkbuiltin.go
+++ b/src/cmd/internal/goobj/mkbuiltin.go
@@ -118,8 +118,8 @@ func mkbuiltin(w io.Writer) {
 
 // addBasicTypes returns the symbol names for basic types that are
 // defined in the runtime and referenced in other packages.
-// Needs to be kept in sync with reflect.go:dumpbasictypes() and
-// reflect.go:dtypesym() in the compiler.
+// Needs to be kept in sync with reflect.go:WriteBasicTypes() and
+// reflect.go:writeType() in the compiler.
 func enumerateBasicTypes() []extra {
 	names := [...]string{
 		"int8", "uint8", "int16", "uint16",
diff --git a/src/cmd/internal/goobj/objfile.go b/src/cmd/internal/goobj/objfile.go
index 6e76bea111..e6447e455d 100644
--- a/src/cmd/internal/goobj/objfile.go
+++ b/src/cmd/internal/goobj/objfile.go
@@ -483,6 +483,11 @@ func (r *RefFlags) SetFlag2(x uint8) { r[9] = x }
 
 func (r *RefFlags) Write(w *Writer) { w.Bytes(r[:]) }
 
+// Used to construct an artifically large array type when reading an
+// item from the object file relocs section or aux sym section (needs
+// to work on 32-bit as well as 64-bit). See issue 41621.
+const huge = (1<<31 - 1) / RelocSize
+
 // Referenced symbol name.
 //
 // Serialized format:
@@ -792,7 +797,7 @@ func (r *Reader) Reloc(i uint32, j int) *Reloc {
 func (r *Reader) Relocs(i uint32) []Reloc {
 	off := r.RelocOff(i, 0)
 	n := r.NReloc(i)
-	return (*[1 << 20]Reloc)(unsafe.Pointer(&r.b[off]))[:n:n]
+	return (*[huge]Reloc)(unsafe.Pointer(&r.b[off]))[:n:n]
 }
 
 // NAux returns the number of aux symbols of the i-th symbol.
@@ -818,7 +823,7 @@ func (r *Reader) Aux(i uint32, j int) *Aux {
 func (r *Reader) Auxs(i uint32) []Aux {
 	off := r.AuxOff(i, 0)
 	n := r.NAux(i)
-	return (*[1 << 20]Aux)(unsafe.Pointer(&r.b[off]))[:n:n]
+	return (*[huge]Aux)(unsafe.Pointer(&r.b[off]))[:n:n]
 }
 
 // DataOff returns the offset of the i-th symbol's data.
diff --git a/src/cmd/internal/moddeps/moddeps_test.go b/src/cmd/internal/moddeps/moddeps_test.go
index 7362e7868b..cba401c896 100644
--- a/src/cmd/internal/moddeps/moddeps_test.go
+++ b/src/cmd/internal/moddeps/moddeps_test.go
@@ -8,6 +8,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"internal/testenv"
+	"io"
 	"io/fs"
 	"io/ioutil"
 	"os"
@@ -21,93 +22,34 @@ import (
 	"golang.org/x/mod/module"
 )
 
-type gorootModule struct {
-	Path      string
-	Dir       string
-	hasVendor bool
-}
-
-// findGorootModules returns the list of modules found in the GOROOT source tree.
-func findGorootModules(t *testing.T) []gorootModule {
-	t.Helper()
-	goBin := testenv.GoToolPath(t)
-
-	goroot.once.Do(func() {
-		goroot.err = filepath.Walk(runtime.GOROOT(), func(path string, info fs.FileInfo, err error) error {
-			if err != nil {
-				return err
-			}
-			if info.IsDir() && (info.Name() == "vendor" || info.Name() == "testdata") {
-				return filepath.SkipDir
-			}
-			if path == filepath.Join(runtime.GOROOT(), "pkg") {
-				// GOROOT/pkg contains generated artifacts, not source code.
-				//
-				// In https://golang.org/issue/37929 it was observed to somehow contain
-				// a module cache, so it is important to skip. (That helps with the
-				// running time of this test anyway.)
-				return filepath.SkipDir
-			}
-			if info.IsDir() || info.Name() != "go.mod" {
-				return nil
-			}
-			dir := filepath.Dir(path)
-
-			// Use 'go list' to describe the module contained in this directory (but
-			// not its dependencies).
-			cmd := exec.Command(goBin, "list", "-json", "-m")
-			cmd.Env = append(os.Environ(), "GO111MODULE=on")
-			cmd.Dir = dir
-			cmd.Stderr = new(strings.Builder)
-			out, err := cmd.Output()
-			if err != nil {
-				return fmt.Errorf("'go list -json -m' in %s: %w\n%s", dir, err, cmd.Stderr)
-			}
-
-			var m gorootModule
-			if err := json.Unmarshal(out, &m); err != nil {
-				return fmt.Errorf("decoding 'go list -json -m' in %s: %w", dir, err)
-			}
-			if m.Path == "" || m.Dir == "" {
-				return fmt.Errorf("'go list -json -m' in %s failed to populate Path and/or Dir", dir)
-			}
-			if _, err := os.Stat(filepath.Join(dir, "vendor")); err == nil {
-				m.hasVendor = true
-			}
-			goroot.modules = append(goroot.modules, m)
-			return nil
-		})
-	})
-
-	if goroot.err != nil {
-		t.Fatal(goroot.err)
-	}
-	return goroot.modules
-}
-
-// goroot caches the list of modules found in the GOROOT source tree.
-var goroot struct {
-	once    sync.Once
-	modules []gorootModule
-	err     error
-}
-
-// TestAllDependenciesVendored ensures that all packages imported within GOROOT
-// are vendored in the corresponding GOROOT module.
+// TestAllDependencies ensures dependencies of all
+// modules in GOROOT are in a consistent state.
 //
-// This property allows offline development within the Go project, and ensures
-// that all dependency changes are presented in the usual code review process.
+// In short mode, it does a limited quick check and stops there.
+// In long mode, it also makes a copy of the entire GOROOT tree
+// and requires network access to perform more thorough checks.
+// Keep this distinction in mind when adding new checks.
 //
-// This test does NOT ensure that the vendored contents match the unmodified
-// contents of the corresponding dependency versions. Such as test would require
-// network access, and would currently either need to copy the entire GOROOT module
-// or explicitly invoke version control to check for changes.
-// (See golang.org/issue/36852 and golang.org/issue/27348.)
-func TestAllDependenciesVendored(t *testing.T) {
+// See issues 36852, 41409, and 43687.
+// (Also see golang.org/issue/27348.)
+func TestAllDependencies(t *testing.T) {
 	goBin := testenv.GoToolPath(t)
 
+	// Ensure that all packages imported within GOROOT
+	// are vendored in the corresponding GOROOT module.
+	//
+	// This property allows offline development within the Go project, and ensures
+	// that all dependency changes are presented in the usual code review process.
+	//
+	// As a quick first-order check, avoid network access and the need to copy the
+	// entire GOROOT tree or explicitly invoke version control to check for changes.
+	// Just check that packages are vendored. (In non-short mode, we go on to also
+	// copy the GOROOT tree and perform more rigorous consistency checks. Jump below
+	// for more details.)
 	for _, m := range findGorootModules(t) {
-		t.Run(m.Path, func(t *testing.T) {
+		// This short test does NOT ensure that the vendored contents match
+		// the unmodified contents of the corresponding dependency versions.
+		t.Run(m.Path+"(quick)", func(t *testing.T) {
 			if m.hasVendor {
 				// Load all of the packages in the module to ensure that their
 				// dependencies are vendored. If any imported package is missing,
@@ -140,6 +82,226 @@ func TestAllDependenciesVendored(t *testing.T) {
 			}
 		})
 	}
+
+	// We now get to the slow, but more thorough part of the test.
+	// Only run it in long test mode.
+	if testing.Short() {
+		return
+	}
+
+	// Ensure that all modules within GOROOT are tidy, vendored, and bundled.
+	// Ensure that the vendored contents match the unmodified contents of the
+	// corresponding dependency versions.
+	//
+	// The non-short section of this test requires network access and the diff
+	// command.
+	//
+	// It makes a temporary copy of the entire GOROOT tree (where it can safely
+	// perform operations that may mutate the tree), executes the same module
+	// maintenance commands that we expect Go developers to run, and then
+	// diffs the potentially modified module copy with the real one in GOROOT.
+	// (We could try to rely on Git to do things differently, but that's not the
+	// path we've chosen at this time. This allows the test to run when the tree
+	// is not checked into Git.)
+
+	testenv.MustHaveExternalNetwork(t)
+	if haveDiff := func() bool {
+		diff, err := exec.Command("diff", "--recursive", "--unified", ".", ".").CombinedOutput()
+		if err != nil || len(diff) != 0 {
+			return false
+		}
+		diff, err = exec.Command("diff", "--recursive", "--unified", ".", "..").CombinedOutput()
+		if err == nil || len(diff) == 0 {
+			return false
+		}
+		return true
+	}(); !haveDiff {
+		// For now, the diff command is a mandatory dependency of this test.
+		// This test will primarily run on longtest builders, since few people
+		// would test the cmd/internal/moddeps package directly, and all.bash
+		// runs tests in short mode. It's fine to skip if diff is unavailable.
+		t.Skip("skipping because a diff command with support for --recursive and --unified flags is unavailable")
+	}
+
+	// Build the bundle binary at the golang.org/x/tools
+	// module version specified in GOROOT/src/cmd/go.mod.
+	bundleDir := t.TempDir()
+	r := runner{Dir: filepath.Join(runtime.GOROOT(), "src/cmd")}
+	r.run(t, goBin, "build", "-mod=readonly", "-o", bundleDir, "golang.org/x/tools/cmd/bundle")
+
+	var gorootCopyDir string
+	for _, m := range findGorootModules(t) {
+		// Create a test-wide GOROOT copy. It can be created once
+		// and reused between subtests whenever they don't fail.
+		//
+		// This is a relatively expensive operation, but it's a pre-requisite to
+		// be able to safely run commands like "go mod tidy", "go mod vendor", and
+		// "go generate" on the GOROOT tree content. Those commands may modify the
+		// tree, and we don't want to happen to the real tree as part of executing
+		// a test.
+		if gorootCopyDir == "" {
+			gorootCopyDir = makeGOROOTCopy(t)
+		}
+
+		t.Run(m.Path+"(thorough)", func(t *testing.T) {
+			defer func() {
+				if t.Failed() {
+					// The test failed, which means it's possible the GOROOT copy
+					// may have been modified. No choice but to reset it for next
+					// module test case. (This is slow, but it happens only during
+					// test failures.)
+					gorootCopyDir = ""
+				}
+			}()
+
+			rel, err := filepath.Rel(runtime.GOROOT(), m.Dir)
+			if err != nil {
+				t.Fatalf("filepath.Rel(%q, %q): %v", runtime.GOROOT(), m.Dir, err)
+			}
+			r := runner{
+				Dir: filepath.Join(gorootCopyDir, rel),
+				Env: append(os.Environ(),
+					// Set GOROOT.
+					"GOROOT="+gorootCopyDir,
+					// Explicitly clear PWD and GOROOT_FINAL so that GOROOT=gorootCopyDir is definitely used.
+					"PWD=",
+					"GOROOT_FINAL=",
+					// Add GOROOTcopy/bin and bundleDir to front of PATH.
+					"PATH="+filepath.Join(gorootCopyDir, "bin")+string(filepath.ListSeparator)+
+						bundleDir+string(filepath.ListSeparator)+os.Getenv("PATH"),
+				),
+			}
+			goBinCopy := filepath.Join(gorootCopyDir, "bin", "go")
+			r.run(t, goBinCopy, "mod", "tidy")   // See issue 43687.
+			r.run(t, goBinCopy, "mod", "verify") // Verify should be a no-op, but test it just in case.
+			r.run(t, goBinCopy, "mod", "vendor") // See issue 36852.
+			pkgs := packagePattern(m.Path)
+			r.run(t, goBinCopy, "generate", `-run=^//go:generate bundle `, pkgs) // See issue 41409.
+			advice := "$ cd " + m.Dir + "\n" +
+				"$ go mod tidy                               # to remove extraneous dependencies\n" +
+				"$ go mod vendor                             # to vendor dependecies\n" +
+				"$ go generate -run=bundle " + pkgs + "               # to regenerate bundled packages\n"
+			if m.Path == "std" {
+				r.run(t, goBinCopy, "generate", "syscall", "internal/syscall/...") // See issue 43440.
+				advice += "$ go generate syscall internal/syscall/...  # to regenerate syscall packages\n"
+			}
+			// TODO(golang.org/issue/43440): Check anything else influenced by dependency versions.
+
+			diff, err := exec.Command("diff", "--recursive", "--unified", r.Dir, m.Dir).CombinedOutput()
+			if err != nil || len(diff) != 0 {
+				t.Errorf(`Module %s in %s is not tidy (-want +got):
+
+%s
+To fix it, run:
+
+%s
+(If module %[1]s is definitely tidy, this could mean
+there's a problem in the go or bundle command.)`, m.Path, m.Dir, diff, advice)
+			}
+		})
+	}
+}
+
+// packagePattern returns a package pattern that matches all packages
+// in the module modulePath, and ideally as few others as possible.
+func packagePattern(modulePath string) string {
+	if modulePath == "std" {
+		return "std"
+	}
+	return modulePath + "/..."
+}
+
+// makeGOROOTCopy makes a temporary copy of the current GOROOT tree.
+// The goal is to allow the calling test t to safely mutate a GOROOT
+// copy without also modifying the original GOROOT.
+//
+// It copies the entire tree as is, with the exception of the GOROOT/.git
+// directory, which is skipped, and the GOROOT/{bin,pkg} directories,
+// which are symlinked. This is done for speed, since a GOROOT tree is
+// functional without being in a Git repository, and bin and pkg are
+// deemed safe to share for the purpose of the TestAllDependencies test.
+func makeGOROOTCopy(t *testing.T) string {
+	t.Helper()
+	gorootCopyDir := t.TempDir()
+	err := filepath.Walk(runtime.GOROOT(), func(src string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if src == filepath.Join(runtime.GOROOT(), ".git") {
+			return filepath.SkipDir
+		}
+
+		rel, err := filepath.Rel(runtime.GOROOT(), src)
+		if err != nil {
+			return fmt.Errorf("filepath.Rel(%q, %q): %v", runtime.GOROOT(), src, err)
+		}
+		dst := filepath.Join(gorootCopyDir, rel)
+
+		switch src {
+		case filepath.Join(runtime.GOROOT(), "bin"),
+			filepath.Join(runtime.GOROOT(), "pkg"):
+			// If the OS supports symlinks, use them instead
+			// of copying the bin and pkg directories.
+			if err := os.Symlink(src, dst); err == nil {
+				return filepath.SkipDir
+			}
+		}
+
+		perm := info.Mode() & os.ModePerm
+		if info.Mode()&os.ModeSymlink != 0 {
+			info, err = os.Stat(src)
+			if err != nil {
+				return err
+			}
+			perm = info.Mode() & os.ModePerm
+		}
+
+		// If it's a directory, make a corresponding directory.
+		if info.IsDir() {
+			return os.MkdirAll(dst, perm|0200)
+		}
+
+		// Copy the file bytes.
+		// We can't create a symlink because the file may get modified;
+		// we need to ensure that only the temporary copy is affected.
+		s, err := os.Open(src)
+		if err != nil {
+			return err
+		}
+		defer s.Close()
+		d, err := os.OpenFile(dst, os.O_WRONLY|os.O_CREATE|os.O_EXCL, perm)
+		if err != nil {
+			return err
+		}
+		_, err = io.Copy(d, s)
+		if err != nil {
+			d.Close()
+			return err
+		}
+		return d.Close()
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	return gorootCopyDir
+}
+
+type runner struct {
+	Dir string
+	Env []string
+}
+
+// run runs the command and requires that it succeeds.
+func (r runner) run(t *testing.T, args ...string) {
+	t.Helper()
+	cmd := exec.Command(args[0], args[1:]...)
+	cmd.Dir = r.Dir
+	cmd.Env = r.Env
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Logf("> %s\n", strings.Join(args, " "))
+		t.Fatalf("command failed: %s\n%s", err, out)
+	}
 }
 
 // TestDependencyVersionsConsistent verifies that each module in GOROOT that
@@ -159,8 +321,7 @@ func TestDependencyVersionsConsistent(t *testing.T) {
 	seen := map[string]map[requirement][]gorootModule{} // module path → requirement → set of modules with that requirement
 	for _, m := range findGorootModules(t) {
 		if !m.hasVendor {
-			// TestAllDependenciesVendored will ensure that the module has no
-			// dependencies.
+			// TestAllDependencies will ensure that the module has no dependencies.
 			continue
 		}
 
@@ -233,3 +394,74 @@ func TestDependencyVersionsConsistent(t *testing.T) {
 		}
 	}
 }
+
+type gorootModule struct {
+	Path      string
+	Dir       string
+	hasVendor bool
+}
+
+// findGorootModules returns the list of modules found in the GOROOT source tree.
+func findGorootModules(t *testing.T) []gorootModule {
+	t.Helper()
+	goBin := testenv.GoToolPath(t)
+
+	goroot.once.Do(func() {
+		goroot.err = filepath.WalkDir(runtime.GOROOT(), func(path string, info fs.DirEntry, err error) error {
+			if err != nil {
+				return err
+			}
+			if info.IsDir() && (info.Name() == "vendor" || info.Name() == "testdata") {
+				return filepath.SkipDir
+			}
+			if path == filepath.Join(runtime.GOROOT(), "pkg") {
+				// GOROOT/pkg contains generated artifacts, not source code.
+				//
+				// In https://golang.org/issue/37929 it was observed to somehow contain
+				// a module cache, so it is important to skip. (That helps with the
+				// running time of this test anyway.)
+				return filepath.SkipDir
+			}
+			if info.IsDir() || info.Name() != "go.mod" {
+				return nil
+			}
+			dir := filepath.Dir(path)
+
+			// Use 'go list' to describe the module contained in this directory (but
+			// not its dependencies).
+			cmd := exec.Command(goBin, "list", "-json", "-m")
+			cmd.Env = append(os.Environ(), "GO111MODULE=on")
+			cmd.Dir = dir
+			cmd.Stderr = new(strings.Builder)
+			out, err := cmd.Output()
+			if err != nil {
+				return fmt.Errorf("'go list -json -m' in %s: %w\n%s", dir, err, cmd.Stderr)
+			}
+
+			var m gorootModule
+			if err := json.Unmarshal(out, &m); err != nil {
+				return fmt.Errorf("decoding 'go list -json -m' in %s: %w", dir, err)
+			}
+			if m.Path == "" || m.Dir == "" {
+				return fmt.Errorf("'go list -json -m' in %s failed to populate Path and/or Dir", dir)
+			}
+			if _, err := os.Stat(filepath.Join(dir, "vendor")); err == nil {
+				m.hasVendor = true
+			}
+			goroot.modules = append(goroot.modules, m)
+			return nil
+		})
+	})
+
+	if goroot.err != nil {
+		t.Fatal(goroot.err)
+	}
+	return goroot.modules
+}
+
+// goroot caches the list of modules found in the GOROOT source tree.
+var goroot struct {
+	once    sync.Once
+	modules []gorootModule
+	err     error
+}
diff --git a/src/cmd/internal/obj/arm64/asm7.go b/src/cmd/internal/obj/arm64/asm7.go
index 1a359f1921..70072cfba4 100644
--- a/src/cmd/internal/obj/arm64/asm7.go
+++ b/src/cmd/internal/obj/arm64/asm7.go
@@ -280,7 +280,7 @@ func MOVCONST(d int64, s int, rt int) uint32 {
 const (
 	// Optab.flag
 	LFROM     = 1 << 0 // p.From uses constant pool
-	LFROM3    = 1 << 1 // p.From3 uses constant pool
+	LFROM128  = 1 << 1 // p.From3<<64+p.From forms a 128-bit constant in literal pool
 	LTO       = 1 << 2 // p.To uses constant pool
 	NOTUSETMP = 1 << 3 // p expands to multiple instructions, but does NOT use REGTMP
 )
@@ -419,7 +419,7 @@ var optab = []Optab{
 	{AMOVD, C_LACON, C_NONE, C_NONE, C_RSP, 34, 8, REGSP, LFROM, 0},
 
 	// Move a large constant to a vector register.
-	{AVMOVQ, C_VCON, C_NONE, C_VCON, C_VREG, 101, 4, 0, LFROM | LFROM3, 0},
+	{AVMOVQ, C_VCON, C_NONE, C_VCON, C_VREG, 101, 4, 0, LFROM128, 0},
 	{AVMOVD, C_VCON, C_NONE, C_NONE, C_VREG, 101, 4, 0, LFROM, 0},
 	{AVMOVS, C_LCON, C_NONE, C_NONE, C_VREG, 101, 4, 0, LFROM, 0},
 
@@ -995,8 +995,8 @@ func span7(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 		if o.flag&LFROM != 0 {
 			c.addpool(p, &p.From)
 		}
-		if o.flag&LFROM3 != 0 {
-			c.addpool(p, p.GetFrom3())
+		if o.flag&LFROM128 != 0 {
+			c.addpool128(p, &p.From, p.GetFrom3())
 		}
 		if o.flag&LTO != 0 {
 			c.addpool(p, &p.To)
@@ -1201,6 +1201,36 @@ func (c *ctxt7) flushpool(p *obj.Prog, skip int) {
 	}
 }
 
+// addpool128 adds a 128-bit constant to literal pool by two consecutive DWORD
+// instructions, the 128-bit constant is formed by ah.Offset<<64+al.Offset.
+func (c *ctxt7) addpool128(p *obj.Prog, al, ah *obj.Addr) {
+	lit := al.Offset
+	q := c.newprog()
+	q.As = ADWORD
+	q.To.Type = obj.TYPE_CONST
+	q.To.Offset = lit
+	q.Pc = int64(c.pool.size)
+
+	lit = ah.Offset
+	t := c.newprog()
+	t.As = ADWORD
+	t.To.Type = obj.TYPE_CONST
+	t.To.Offset = lit
+	t.Pc = int64(c.pool.size + 8)
+	q.Link = t
+
+	if c.blitrl == nil {
+		c.blitrl = q
+		c.pool.start = uint32(p.Pc)
+	} else {
+		c.elitrl.Link = q
+	}
+
+	c.elitrl = t
+	c.pool.size += 16
+	p.Pool = q
+}
+
 /*
  * MOVD foo(SB), R is actually
  *   MOVD addr, REGTMP
diff --git a/src/cmd/internal/obj/arm64/asm_test.go b/src/cmd/internal/obj/arm64/asm_arm64_test.go
index 9efdb0217f..c6a00f5b94 100644
--- a/src/cmd/internal/obj/arm64/asm_test.go
+++ b/src/cmd/internal/obj/arm64/asm_arm64_test.go
@@ -47,7 +47,7 @@ func TestLarge(t *testing.T) {
 
 	// assemble generated file
 	cmd := exec.Command(testenv.GoToolPath(t), "tool", "asm", "-S", "-o", filepath.Join(dir, "test.o"), tmpfile)
-	cmd.Env = append(os.Environ(), "GOARCH=arm64", "GOOS=linux")
+	cmd.Env = append(os.Environ(), "GOOS=linux")
 	out, err := cmd.CombinedOutput()
 	if err != nil {
 		t.Errorf("Assemble failed: %v, output: %s", err, out)
@@ -62,7 +62,7 @@ func TestLarge(t *testing.T) {
 
 	// build generated file
 	cmd = exec.Command(testenv.GoToolPath(t), "tool", "asm", "-o", filepath.Join(dir, "x.o"), tmpfile)
-	cmd.Env = append(os.Environ(), "GOARCH=arm64", "GOOS=linux")
+	cmd.Env = append(os.Environ(), "GOOS=linux")
 	out, err = cmd.CombinedOutput()
 	if err != nil {
 		t.Errorf("Build failed: %v, output: %s", err, out)
@@ -96,7 +96,7 @@ func TestNoRet(t *testing.T) {
 		t.Fatal(err)
 	}
 	cmd := exec.Command(testenv.GoToolPath(t), "tool", "asm", "-o", filepath.Join(dir, "x.o"), tmpfile)
-	cmd.Env = append(os.Environ(), "GOARCH=arm64", "GOOS=linux")
+	cmd.Env = append(os.Environ(), "GOOS=linux")
 	if out, err := cmd.CombinedOutput(); err != nil {
 		t.Errorf("%v\n%s", err, out)
 	}
@@ -134,7 +134,7 @@ func TestPCALIGN(t *testing.T) {
 			t.Fatal(err)
 		}
 		cmd := exec.Command(testenv.GoToolPath(t), "tool", "asm", "-S", "-o", tmpout, tmpfile)
-		cmd.Env = append(os.Environ(), "GOARCH=arm64", "GOOS=linux")
+		cmd.Env = append(os.Environ(), "GOOS=linux")
 		out, err := cmd.CombinedOutput()
 		if err != nil {
 			t.Errorf("The %s build failed: %v, output: %s", test.name, err, out)
@@ -150,3 +150,13 @@ func TestPCALIGN(t *testing.T) {
 		}
 	}
 }
+
+func testvmovq() (r1, r2 uint64)
+
+// TestVMOVQ checks if the arm64 VMOVQ instruction is working properly.
+func TestVMOVQ(t *testing.T) {
+	a, b := testvmovq()
+	if a != 0x7040201008040201 || b != 0x3040201008040201 {
+		t.Errorf("TestVMOVQ got: a=0x%x, b=0x%x, want: a=0x7040201008040201, b=0x3040201008040201", a, b)
+	}
+}
diff --git a/src/cmd/internal/obj/arm64/asm_arm64_test.s b/src/cmd/internal/obj/arm64/asm_arm64_test.s
new file mode 100644
index 0000000000..9d337a4fd1
--- /dev/null
+++ b/src/cmd/internal/obj/arm64/asm_arm64_test.s
@@ -0,0 +1,14 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+
+// testvmovq() (r1, r2 uint64)
+TEXT ·testvmovq(SB), NOSPLIT, $0-16
+	VMOVQ   $0x7040201008040201, $0x3040201008040201, V1
+	VMOV    V1.D[0], R0
+	VMOV    V1.D[1], R1
+	MOVD    R0, r1+0(FP)
+	MOVD    R1, r2+8(FP)
+	RET
diff --git a/src/cmd/internal/obj/dwarf.go b/src/cmd/internal/obj/dwarf.go
index 328fb03b24..87c62e2981 100644
--- a/src/cmd/internal/obj/dwarf.go
+++ b/src/cmd/internal/obj/dwarf.go
@@ -104,7 +104,8 @@ func (ctxt *Link) generateDebugLinesSymbol(s, lines *LSym) {
 	// GDB will assign a line number of zero the last row in the line
 	// table, which we don't want.
 	lastlen := uint64(s.Size - (lastpc - s.Func().Text.Pc))
-	putpclcdelta(ctxt, dctxt, lines, lastlen, 0)
+	dctxt.AddUint8(lines, dwarf.DW_LNS_advance_pc)
+	dwarf.Uleb128put(dctxt, lines, int64(lastlen))
 	dctxt.AddUint8(lines, 0) // start extended opcode
 	dwarf.Uleb128put(dctxt, lines, 1)
 	dctxt.AddUint8(lines, dwarf.DW_LNE_end_sequence)
diff --git a/src/cmd/internal/obj/link.go b/src/cmd/internal/obj/link.go
index 8c8ff587ff..8206902328 100644
--- a/src/cmd/internal/obj/link.go
+++ b/src/cmd/internal/obj/link.go
@@ -39,6 +39,7 @@ import (
 	"cmd/internal/sys"
 	"fmt"
 	"sync"
+	"sync/atomic"
 )
 
 // An Addr is an argument to an instruction.
@@ -250,6 +251,12 @@ func (a *Addr) SetTarget(t *Prog) {
 	a.Val = t
 }
 
+func (a *Addr) SetConst(v int64) {
+	a.Sym = nil
+	a.Type = TYPE_CONST
+	a.Offset = v
+}
+
 // Prog describes a single machine instruction.
 //
 // The general instruction form is:
@@ -629,6 +636,10 @@ const (
 	// ContentAddressable indicates this is a content-addressable symbol.
 	AttrContentAddressable
 
+	// ABI wrapper is set for compiler-generated text symbols that
+	// convert between ABI0 and ABIInternal calling conventions.
+	AttrABIWrapper
+
 	// attrABIBase is the value at which the ABI is encoded in
 	// Attribute. This must be last; all bits after this are
 	// assumed to be an ABI value.
@@ -637,36 +648,52 @@ const (
 	attrABIBase
 )
 
-func (a Attribute) DuplicateOK() bool        { return a&AttrDuplicateOK != 0 }
-func (a Attribute) MakeTypelink() bool       { return a&AttrMakeTypelink != 0 }
-func (a Attribute) CFunc() bool              { return a&AttrCFunc != 0 }
-func (a Attribute) NoSplit() bool            { return a&AttrNoSplit != 0 }
-func (a Attribute) Leaf() bool               { return a&AttrLeaf != 0 }
-func (a Attribute) OnList() bool             { return a&AttrOnList != 0 }
-func (a Attribute) ReflectMethod() bool      { return a&AttrReflectMethod != 0 }
-func (a Attribute) Local() bool              { return a&AttrLocal != 0 }
-func (a Attribute) Wrapper() bool            { return a&AttrWrapper != 0 }
-func (a Attribute) NeedCtxt() bool           { return a&AttrNeedCtxt != 0 }
-func (a Attribute) NoFrame() bool            { return a&AttrNoFrame != 0 }
-func (a Attribute) Static() bool             { return a&AttrStatic != 0 }
-func (a Attribute) WasInlined() bool         { return a&AttrWasInlined != 0 }
-func (a Attribute) TopFrame() bool           { return a&AttrTopFrame != 0 }
-func (a Attribute) Indexed() bool            { return a&AttrIndexed != 0 }
-func (a Attribute) UsedInIface() bool        { return a&AttrUsedInIface != 0 }
-func (a Attribute) ContentAddressable() bool { return a&AttrContentAddressable != 0 }
+func (a *Attribute) load() Attribute { return Attribute(atomic.LoadUint32((*uint32)(a))) }
+
+func (a *Attribute) DuplicateOK() bool        { return a.load()&AttrDuplicateOK != 0 }
+func (a *Attribute) MakeTypelink() bool       { return a.load()&AttrMakeTypelink != 0 }
+func (a *Attribute) CFunc() bool              { return a.load()&AttrCFunc != 0 }
+func (a *Attribute) NoSplit() bool            { return a.load()&AttrNoSplit != 0 }
+func (a *Attribute) Leaf() bool               { return a.load()&AttrLeaf != 0 }
+func (a *Attribute) OnList() bool             { return a.load()&AttrOnList != 0 }
+func (a *Attribute) ReflectMethod() bool      { return a.load()&AttrReflectMethod != 0 }
+func (a *Attribute) Local() bool              { return a.load()&AttrLocal != 0 }
+func (a *Attribute) Wrapper() bool            { return a.load()&AttrWrapper != 0 }
+func (a *Attribute) NeedCtxt() bool           { return a.load()&AttrNeedCtxt != 0 }
+func (a *Attribute) NoFrame() bool            { return a.load()&AttrNoFrame != 0 }
+func (a *Attribute) Static() bool             { return a.load()&AttrStatic != 0 }
+func (a *Attribute) WasInlined() bool         { return a.load()&AttrWasInlined != 0 }
+func (a *Attribute) TopFrame() bool           { return a.load()&AttrTopFrame != 0 }
+func (a *Attribute) Indexed() bool            { return a.load()&AttrIndexed != 0 }
+func (a *Attribute) UsedInIface() bool        { return a.load()&AttrUsedInIface != 0 }
+func (a *Attribute) ContentAddressable() bool { return a.load()&AttrContentAddressable != 0 }
+func (a *Attribute) ABIWrapper() bool         { return a.load()&AttrABIWrapper != 0 }
 
 func (a *Attribute) Set(flag Attribute, value bool) {
-	if value {
-		*a |= flag
-	} else {
-		*a &^= flag
+	for {
+		v0 := a.load()
+		v := v0
+		if value {
+			v |= flag
+		} else {
+			v &^= flag
+		}
+		if atomic.CompareAndSwapUint32((*uint32)(a), uint32(v0), uint32(v)) {
+			break
+		}
 	}
 }
 
-func (a Attribute) ABI() ABI { return ABI(a / attrABIBase) }
+func (a *Attribute) ABI() ABI { return ABI(a.load() / attrABIBase) }
 func (a *Attribute) SetABI(abi ABI) {
 	const mask = 1 // Only one ABI bit for now.
-	*a = (*a &^ (mask * attrABIBase)) | Attribute(abi)*attrABIBase
+	for {
+		v0 := a.load()
+		v := (v0 &^ (mask * attrABIBase)) | Attribute(abi)*attrABIBase
+		if atomic.CompareAndSwapUint32((*uint32)(a), uint32(v0), uint32(v)) {
+			break
+		}
+	}
 }
 
 var textAttrStrings = [...]struct {
@@ -689,6 +716,7 @@ var textAttrStrings = [...]struct {
 	{bit: AttrTopFrame, s: "TOPFRAME"},
 	{bit: AttrIndexed, s: ""},
 	{bit: AttrContentAddressable, s: ""},
+	{bit: AttrABIWrapper, s: "ABIWRAPPER"},
 }
 
 // TextAttrString formats a for printing in as part of a TEXT prog.
@@ -723,8 +751,8 @@ func (s *LSym) String() string {
 }
 
 // The compiler needs *LSym to be assignable to cmd/compile/internal/ssa.Sym.
-func (s *LSym) CanBeAnSSASym() {
-}
+func (*LSym) CanBeAnSSASym() {}
+func (*LSym) CanBeAnSSAAux() {}
 
 type Pcln struct {
 	// Aux symbols for pcln
@@ -754,6 +782,17 @@ type Auto struct {
 	Gotype  *LSym
 }
 
+// RegArg provides spill/fill information for a register-resident argument
+// to a function.  These need spilling/filling in the safepoint/stackgrowth case.
+// At the time of fill/spill, the offset must be adjusted by the architecture-dependent
+// adjustment to hardware SP that occurs in a call instruction.  E.g., for AMD64,
+// at Offset+8 because the return address was pushed.
+type RegArg struct {
+	Addr           Addr
+	Reg            int16
+	Spill, Unspill As
+}
+
 // Link holds the context for writing object code from a compiler
 // to be linker input or for reading that input into the linker.
 type Link struct {
@@ -784,6 +823,7 @@ type Link struct {
 	DebugInfo          func(fn *LSym, info *LSym, curfn interface{}) ([]dwarf.Scope, dwarf.InlCalls) // if non-nil, curfn is a *gc.Node
 	GenAbstractFunc    func(fn *LSym)
 	Errors             int
+	RegArgs            []RegArg
 
 	InParallel    bool // parallel backend phase in effect
 	UseBASEntries bool // use Base Address Selection Entries in location lists and PC ranges
@@ -832,6 +872,32 @@ func (ctxt *Link) Logf(format string, args ...interface{}) {
 	ctxt.Bso.Flush()
 }
 
+func (ctxt *Link) SpillRegisterArgs(last *Prog, pa ProgAlloc) *Prog {
+	// Spill register args.
+	for _, ra := range ctxt.RegArgs {
+		spill := Appendp(last, pa)
+		spill.As = ra.Spill
+		spill.From.Type = TYPE_REG
+		spill.From.Reg = ra.Reg
+		spill.To = ra.Addr
+		last = spill
+	}
+	return last
+}
+
+func (ctxt *Link) UnspillRegisterArgs(last *Prog, pa ProgAlloc) *Prog {
+	// Unspill any spilled register args
+	for _, ra := range ctxt.RegArgs {
+		unspill := Appendp(last, pa)
+		unspill.As = ra.Unspill
+		unspill.From = ra.Addr
+		unspill.To.Type = TYPE_REG
+		unspill.To.Reg = ra.Reg
+		last = unspill
+	}
+	return last
+}
+
 // The smallest possible offset from the hardware stack pointer to a local
 // variable on the stack. Architectures that use a link register save its value
 // on the stack in the function prologue and so always have a pointer between
diff --git a/src/cmd/internal/obj/plist.go b/src/cmd/internal/obj/plist.go
index 2b096996f7..679ce7eb8f 100644
--- a/src/cmd/internal/obj/plist.go
+++ b/src/cmd/internal/obj/plist.go
@@ -80,6 +80,11 @@ func Flushplist(ctxt *Link, plist *Plist, newprog ProgAlloc, myimportpath string
 		if !strings.HasPrefix(s.Name, "\"\".") {
 			continue
 		}
+		if s.ABIWrapper() {
+			// Don't create an args_stackmap symbol reference for an ABI
+			// wrapper function
+			continue
+		}
 		found := false
 		for p := s.Func().Text; p != nil; p = p.Link {
 			if p.As == AFUNCDATA && p.From.Type == TYPE_CONST && p.From.Offset == objabi.FUNCDATA_ArgsPointerMaps {
@@ -134,6 +139,7 @@ func (ctxt *Link) InitTextSym(s *LSym, flag int) {
 	s.Set(AttrNoSplit, flag&NOSPLIT != 0)
 	s.Set(AttrReflectMethod, flag&REFLECTMETHOD != 0)
 	s.Set(AttrWrapper, flag&WRAPPER != 0)
+	s.Set(AttrABIWrapper, flag&ABIWRAPPER != 0)
 	s.Set(AttrNeedCtxt, flag&NEEDCTXT != 0)
 	s.Set(AttrNoFrame, flag&NOFRAME != 0)
 	s.Set(AttrTopFrame, flag&TOPFRAME != 0)
diff --git a/src/cmd/internal/obj/ppc64/asm9.go b/src/cmd/internal/obj/ppc64/asm9.go
index 775d27d8e8..41e263b2c0 100644
--- a/src/cmd/internal/obj/ppc64/asm9.go
+++ b/src/cmd/internal/obj/ppc64/asm9.go
@@ -334,6 +334,7 @@ var optab = []Optab{
 	{ABC, C_SCON, C_REG, C_NONE, C_SBRA, 16, 4, 0},
 	{ABC, C_SCON, C_REG, C_NONE, C_LBRA, 17, 4, 0},
 	{ABR, C_NONE, C_NONE, C_NONE, C_LR, 18, 4, 0},
+	{ABR, C_NONE, C_NONE, C_SCON, C_LR, 18, 4, 0},
 	{ABR, C_NONE, C_NONE, C_NONE, C_CTR, 18, 4, 0},
 	{ABR, C_REG, C_NONE, C_NONE, C_CTR, 18, 4, 0},
 	{ABR, C_NONE, C_NONE, C_NONE, C_ZOREG, 15, 8, 0},
@@ -2844,6 +2845,7 @@ func (c *ctxt9) asmout(p *obj.Prog, o *Optab, out []uint32) {
 
 	case 18: /* br/bl (lr/ctr); bc/bcl bo,bi,(lr/ctr) */
 		var v int32
+		var bh uint32 = 0
 		if p.As == ABC || p.As == ABCL {
 			v = c.regoff(&p.From) & 31
 		} else {
@@ -2865,6 +2867,15 @@ func (c *ctxt9) asmout(p *obj.Prog, o *Optab, out []uint32) {
 			v = 0
 		}
 
+		// Insert optional branch hint for bclr[l]/bcctr[l]
+		if p.From3Type() != obj.TYPE_NONE {
+			bh = uint32(p.GetFrom3().Offset)
+			if bh == 2 || bh > 3 {
+				log.Fatalf("BH must be 0,1,3 for %v", p)
+			}
+			o1 |= bh << 11
+		}
+
 		if p.As == ABL || p.As == ABCL {
 			o1 |= 1
 		}
diff --git a/src/cmd/internal/obj/riscv/obj.go b/src/cmd/internal/obj/riscv/obj.go
index 0cffa54fa6..9257a6453a 100644
--- a/src/cmd/internal/obj/riscv/obj.go
+++ b/src/cmd/internal/obj/riscv/obj.go
@@ -1777,15 +1777,15 @@ func instructionsForProg(p *obj.Prog) []*instruction {
 		case ABGEZ:
 			ins.as, ins.rs1, ins.rs2 = ABGE, REG_ZERO, uint32(p.From.Reg)
 		case ABGT:
-			ins.as, ins.rs1, ins.rs2 = ABLT, uint32(p.Reg), uint32(p.From.Reg)
+			ins.as, ins.rs1, ins.rs2 = ABLT, uint32(p.From.Reg), uint32(p.Reg)
 		case ABGTU:
-			ins.as, ins.rs1, ins.rs2 = ABLTU, uint32(p.Reg), uint32(p.From.Reg)
+			ins.as, ins.rs1, ins.rs2 = ABLTU, uint32(p.From.Reg), uint32(p.Reg)
 		case ABGTZ:
 			ins.as, ins.rs1, ins.rs2 = ABLT, uint32(p.From.Reg), REG_ZERO
 		case ABLE:
-			ins.as, ins.rs1, ins.rs2 = ABGE, uint32(p.Reg), uint32(p.From.Reg)
+			ins.as, ins.rs1, ins.rs2 = ABGE, uint32(p.From.Reg), uint32(p.Reg)
 		case ABLEU:
-			ins.as, ins.rs1, ins.rs2 = ABGEU, uint32(p.Reg), uint32(p.From.Reg)
+			ins.as, ins.rs1, ins.rs2 = ABGEU, uint32(p.From.Reg), uint32(p.Reg)
 		case ABLEZ:
 			ins.as, ins.rs1, ins.rs2 = ABGE, uint32(p.From.Reg), REG_ZERO
 		case ABLTZ:
diff --git a/src/cmd/internal/obj/riscv/testdata/testbranch/branch_test.go b/src/cmd/internal/obj/riscv/testdata/testbranch/branch_test.go
index 803ba8c77c..279aeb2c32 100644
--- a/src/cmd/internal/obj/riscv/testdata/testbranch/branch_test.go
+++ b/src/cmd/internal/obj/riscv/testdata/testbranch/branch_test.go
@@ -11,6 +11,8 @@ import (
 )
 
 func testBEQZ(a int64) (r bool)
+func testBGE(a, b int64) (r bool)
+func testBGEU(a, b int64) (r bool)
 func testBGEZ(a int64) (r bool)
 func testBGT(a, b int64) (r bool)
 func testBGTU(a, b int64) (r bool)
@@ -18,6 +20,8 @@ func testBGTZ(a int64) (r bool)
 func testBLE(a, b int64) (r bool)
 func testBLEU(a, b int64) (r bool)
 func testBLEZ(a int64) (r bool)
+func testBLT(a, b int64) (r bool)
+func testBLTU(a, b int64) (r bool)
 func testBLTZ(a int64) (r bool)
 func testBNEZ(a int64) (r bool)
 
@@ -29,30 +33,75 @@ func TestBranchCondition(t *testing.T) {
 		fn   func(a, b int64) bool
 		want bool
 	}{
-		{"BGT", 0, 1, testBGT, true},
+		{"BGE", 0, 1, testBGE, false},
+		{"BGE", 0, 0, testBGE, true},
+		{"BGE", 0, -1, testBGE, true},
+		{"BGE", -1, 0, testBGE, false},
+		{"BGE", 1, 0, testBGE, true},
+		{"BGEU", 0, 1, testBGEU, false},
+		{"BGEU", 0, 0, testBGEU, true},
+		{"BGEU", 0, -1, testBGEU, false},
+		{"BGEU", -1, 0, testBGEU, true},
+		{"BGEU", 1, 0, testBGEU, true},
+		{"BGT", 0, 1, testBGT, false},
 		{"BGT", 0, 0, testBGT, false},
-		{"BGT", 0, -1, testBGT, false},
-		{"BGT", -1, 0, testBGT, true},
-		{"BGT", 1, 0, testBGT, false},
-		{"BGTU", 0, 1, testBGTU, true},
-		{"BGTU", 0, -1, testBGTU, true},
-		{"BGTU", -1, 0, testBGTU, false},
-		{"BGTU", 1, 0, testBGTU, false},
-		{"BLE", 0, 1, testBLE, false},
-		{"BLE", 0, -1, testBLE, true},
+		{"BGT", 0, -1, testBGT, true},
+		{"BGT", -1, 0, testBGT, false},
+		{"BGT", 1, 0, testBGT, true},
+		{"BGTU", 0, 1, testBGTU, false},
+		{"BGTU", 0, 0, testBGTU, false},
+		{"BGTU", 0, -1, testBGTU, false},
+		{"BGTU", -1, 0, testBGTU, true},
+		{"BGTU", 1, 0, testBGTU, true},
+		{"BLE", 0, 1, testBLE, true},
 		{"BLE", 0, 0, testBLE, true},
-		{"BLE", -1, 0, testBLE, false},
-		{"BLE", 1, 0, testBLE, true},
-		{"BLEU", 0, 1, testBLEU, false},
-		{"BLEU", 0, -1, testBLEU, false},
+		{"BLE", 0, -1, testBLE, false},
+		{"BLE", -1, 0, testBLE, true},
+		{"BLE", 1, 0, testBLE, false},
+		{"BLEU", 0, 1, testBLEU, true},
 		{"BLEU", 0, 0, testBLEU, true},
-		{"BLEU", -1, 0, testBLEU, true},
-		{"BLEU", 1, 0, testBLEU, true},
+		{"BLEU", 0, -1, testBLEU, true},
+		{"BLEU", -1, 0, testBLEU, false},
+		{"BLEU", 1, 0, testBLEU, false},
+		{"BLT", 0, 1, testBLT, true},
+		{"BLT", 0, 0, testBLT, false},
+		{"BLT", 0, -1, testBLT, false},
+		{"BLT", -1, 0, testBLT, true},
+		{"BLT", 1, 0, testBLT, false},
+		{"BLTU", 0, 1, testBLTU, true},
+		{"BLTU", 0, 0, testBLTU, false},
+		{"BLTU", 0, -1, testBLTU, true},
+		{"BLTU", -1, 0, testBLTU, false},
+		{"BLTU", 1, 0, testBLTU, false},
 	}
 	for _, test := range tests {
 		t.Run(test.ins, func(t *testing.T) {
+			var fn func(a, b int64) bool
+			switch test.ins {
+			case "BGE":
+				fn = func(a, b int64) bool { return a >= b }
+			case "BGEU":
+				fn = func(a, b int64) bool { return uint64(a) >= uint64(b) }
+			case "BGT":
+				fn = func(a, b int64) bool { return a > b }
+			case "BGTU":
+				fn = func(a, b int64) bool { return uint64(a) > uint64(b) }
+			case "BLE":
+				fn = func(a, b int64) bool { return a <= b }
+			case "BLEU":
+				fn = func(a, b int64) bool { return uint64(a) <= uint64(b) }
+			case "BLT":
+				fn = func(a, b int64) bool { return a < b }
+			case "BLTU":
+				fn = func(a, b int64) bool { return uint64(a) < uint64(b) }
+			default:
+				t.Fatalf("Unknown instruction %q", test.ins)
+			}
+			if got := fn(test.a, test.b); got != test.want {
+				t.Errorf("Go %v %v, %v = %v, want %v", test.ins, test.a, test.b, got, test.want)
+			}
 			if got := test.fn(test.a, test.b); got != test.want {
-				t.Errorf("%v %v, %v = %v, want %v", test.ins, test.a, test.b, got, test.want)
+				t.Errorf("Assembly %v %v, %v = %v, want %v", test.ins, test.a, test.b, got, test.want)
 			}
 		})
 	}
diff --git a/src/cmd/internal/obj/riscv/testdata/testbranch/branch_test.s b/src/cmd/internal/obj/riscv/testdata/testbranch/branch_test.s
index 6cff235848..8dd6f563af 100644
--- a/src/cmd/internal/obj/riscv/testdata/testbranch/branch_test.s
+++ b/src/cmd/internal/obj/riscv/testdata/testbranch/branch_test.s
@@ -16,6 +16,28 @@ b:
 	MOV	X6, r+8(FP)
 	RET
 
+// func testBGE(a, b int64) (r bool)
+TEXT ·testBGE(SB),NOSPLIT,$0-0
+	MOV	a+0(FP), X5
+	MOV	b+8(FP), X6
+	MOV	$1, X7
+	BGE	X5, X6, b
+	MOV	$0, X7
+b:
+	MOV	X7, r+16(FP)
+	RET
+
+// func testBGEU(a, b int64) (r bool)
+TEXT ·testBGEU(SB),NOSPLIT,$0-0
+	MOV	a+0(FP), X5
+	MOV	b+8(FP), X6
+	MOV	$1, X7
+	BGEU	X5, X6, b
+	MOV	$0, X7
+b:
+	MOV	X7, r+16(FP)
+	RET
+
 // func testBGEZ(a int64) (r bool)
 TEXT ·testBGEZ(SB),NOSPLIT,$0-0
 	MOV	a+0(FP), X5
@@ -90,6 +112,28 @@ b:
 	MOV	X6, r+8(FP)
 	RET
 
+// func testBLT(a, b int64) (r bool)
+TEXT ·testBLT(SB),NOSPLIT,$0-0
+	MOV	a+0(FP), X5
+	MOV	b+8(FP), X6
+	MOV	$1, X7
+	BLT	X5, X6, b
+	MOV	$0, X7
+b:
+	MOV	X7, r+16(FP)
+	RET
+
+// func testBLTU(a, b int64) (r bool)
+TEXT ·testBLTU(SB),NOSPLIT,$0-0
+	MOV	a+0(FP), X5
+	MOV	b+8(FP), X6
+	MOV	$1, X7
+	BLTU	X5, X6, b
+	MOV	$0, X7
+b:
+	MOV	X7, r+16(FP)
+	RET
+
 // func testBLTZ(a int64) (r bool)
 TEXT ·testBLTZ(SB),NOSPLIT,$0-0
 	MOV	a+0(FP), X5
diff --git a/src/cmd/internal/obj/s390x/asmz.go b/src/cmd/internal/obj/s390x/asmz.go
index f0f9d5cefc..06921085c9 100644
--- a/src/cmd/internal/obj/s390x/asmz.go
+++ b/src/cmd/internal/obj/s390x/asmz.go
@@ -3700,7 +3700,7 @@ func (c *ctxtz) asmout(p *obj.Prog, asm *[]byte) {
 		}
 
 	case 80: // sync
-		zRR(op_BCR, uint32(NotEqual), 0, asm)
+		zRR(op_BCR, 14, 0, asm) // fast-BCR-serialization
 
 	case 81: // float to fixed and fixed to float moves (no conversion)
 		switch p.As {
diff --git a/src/cmd/internal/obj/s390x/condition_code.go b/src/cmd/internal/obj/s390x/condition_code.go
index 764fc5bc6a..f498fd6f77 100644
--- a/src/cmd/internal/obj/s390x/condition_code.go
+++ b/src/cmd/internal/obj/s390x/condition_code.go
@@ -124,3 +124,5 @@ func (c CCMask) String() string {
 	// invalid
 	return fmt.Sprintf("Invalid (%#x)", c)
 }
+
+func (CCMask) CanBeAnSSAAux() {}
diff --git a/src/cmd/internal/obj/s390x/rotate.go b/src/cmd/internal/obj/s390x/rotate.go
index 7dbc45e648..5407c8df11 100644
--- a/src/cmd/internal/obj/s390x/rotate.go
+++ b/src/cmd/internal/obj/s390x/rotate.go
@@ -28,9 +28,9 @@ import (
 // input left by. Note that this rotation is performed
 // before the masked region is used.
 type RotateParams struct {
-	Start  int8 // big-endian start bit index [0..63]
-	End    int8 // big-endian end bit index [0..63]
-	Amount int8 // amount to rotate left
+	Start  uint8 // big-endian start bit index [0..63]
+	End    uint8 // big-endian end bit index [0..63]
+	Amount uint8 // amount to rotate left
 }
 
 // NewRotateParams creates a set of parameters representing a
@@ -39,7 +39,7 @@ type RotateParams struct {
 //
 // The start and end indexes and the rotation amount must all
 // be in the range 0-63 inclusive or this function will panic.
-func NewRotateParams(start, end, amount int8) RotateParams {
+func NewRotateParams(start, end, amount uint8) RotateParams {
 	if start&^63 != 0 {
 		panic("start out of bounds")
 	}
@@ -58,7 +58,7 @@ func NewRotateParams(start, end, amount int8) RotateParams {
 
 // RotateLeft generates a new set of parameters with the rotation amount
 // increased by the given value. The selected bits are left unchanged.
-func (r RotateParams) RotateLeft(amount int8) RotateParams {
+func (r RotateParams) RotateLeft(amount uint8) RotateParams {
 	r.Amount += amount
 	r.Amount &= 63
 	return r
@@ -100,8 +100,8 @@ func (r RotateParams) OutMerge(mask uint64) *RotateParams {
 	}
 
 	// update start and end positions (rotation amount remains the same)
-	r.Start = int8(o+z) & 63
-	r.End = (r.Start + int8(l) - 1) & 63
+	r.Start = uint8(o+z) & 63
+	r.End = (r.Start + uint8(l) - 1) & 63
 	return &r
 }
 
@@ -113,3 +113,5 @@ func (r RotateParams) OutMerge(mask uint64) *RotateParams {
 func (r RotateParams) InMerge(mask uint64) *RotateParams {
 	return r.OutMerge(bits.RotateLeft64(mask, int(r.Amount)))
 }
+
+func (RotateParams) CanBeAnSSAAux() {}
diff --git a/src/cmd/internal/obj/s390x/rotate_test.go b/src/cmd/internal/obj/s390x/rotate_test.go
index fa5b5bdecd..88421b1b83 100644
--- a/src/cmd/internal/obj/s390x/rotate_test.go
+++ b/src/cmd/internal/obj/s390x/rotate_test.go
@@ -10,7 +10,7 @@ import (
 
 func TestRotateParamsMask(t *testing.T) {
 	tests := []struct {
-		start, end, amount int8
+		start, end, amount uint8
 		inMask, outMask    uint64
 	}{
 		// start before end, no rotation
diff --git a/src/cmd/internal/obj/textflag.go b/src/cmd/internal/obj/textflag.go
index d2cec734b1..2f55793285 100644
--- a/src/cmd/internal/obj/textflag.go
+++ b/src/cmd/internal/obj/textflag.go
@@ -33,7 +33,7 @@ const (
 	// This function uses its incoming context register.
 	NEEDCTXT = 64
 
-	// When passed to ggloblsym, causes Local to be set to true on the LSym it creates.
+	// When passed to objw.Global, causes Local to be set to true on the LSym it creates.
 	LOCAL = 128
 
 	// Allocate a word of thread local storage and store the offset from the
@@ -51,4 +51,7 @@ const (
 	// Function is the top of the call stack. Call stack unwinders should stop
 	// at this function.
 	TOPFRAME = 2048
+
+	// Function is an ABI wrapper.
+	ABIWRAPPER = 4096
 )
diff --git a/src/cmd/internal/obj/x86/a.out.go b/src/cmd/internal/obj/x86/a.out.go
index 30c1a6a445..3be4b59da4 100644
--- a/src/cmd/internal/obj/x86/a.out.go
+++ b/src/cmd/internal/obj/x86/a.out.go
@@ -263,6 +263,7 @@ const (
 	FREGRET  = REG_X0
 	REGSP    = REG_SP
 	REGCTXT  = REG_DX
+	REGG     = REG_R14     // g register in ABIInternal
 	REGEXT   = REG_R15     // compiler allocates external registers R15 down
 	FREGMIN  = REG_X0 + 5  // first register variable
 	FREGEXT  = REG_X0 + 15 // first external register
diff --git a/src/cmd/internal/obj/x86/obj6.go b/src/cmd/internal/obj/x86/obj6.go
index 184fb4308b..84de58a4c4 100644
--- a/src/cmd/internal/obj/x86/obj6.go
+++ b/src/cmd/internal/obj/x86/obj6.go
@@ -637,13 +637,19 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 		}
 	}
 
-	if !p.From.Sym.NoSplit() || p.From.Sym.Wrapper() {
-		p = obj.Appendp(p, newprog)
-		p = load_g_cx(ctxt, p, newprog) // load g into CX
+	var regg int16
+	if !p.From.Sym.NoSplit() || (p.From.Sym.Wrapper() && !p.From.Sym.ABIWrapper()) {
+		if ctxt.Arch.Family == sys.AMD64 && objabi.Regabi_enabled != 0 && cursym.ABI() == obj.ABIInternal {
+			regg = REGG // use the g register directly in ABIInternal
+		} else {
+			p = obj.Appendp(p, newprog)
+			p = load_g_cx(ctxt, p, newprog) // load g into CX
+			regg = REG_CX
+		}
 	}
 
 	if !cursym.Func().Text.From.Sym.NoSplit() {
-		p = stacksplit(ctxt, cursym, p, newprog, autoffset, int32(textarg)) // emit split check
+		p = stacksplit(ctxt, cursym, p, newprog, autoffset, int32(textarg), regg) // emit split check
 	}
 
 	// Delve debugger would like the next instruction to be noted as the end of the function prologue.
@@ -690,12 +696,12 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 		p.To.Reg = REG_BP
 	}
 
-	if cursym.Func().Text.From.Sym.Wrapper() {
+	if cursym.Func().Text.From.Sym.Wrapper() && !cursym.Func().Text.From.Sym.ABIWrapper() {
 		// if g._panic != nil && g._panic.argp == FP {
 		//   g._panic.argp = bottom-of-frame
 		// }
 		//
-		//	MOVQ g_panic(CX), BX
+		//	MOVQ g_panic(g), BX
 		//	TESTQ BX, BX
 		//	JNE checkargp
 		// end:
@@ -718,7 +724,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 		p = obj.Appendp(p, newprog)
 		p.As = AMOVQ
 		p.From.Type = obj.TYPE_MEM
-		p.From.Reg = REG_CX
+		p.From.Reg = regg
 		p.From.Offset = 4 * int64(ctxt.Arch.PtrSize) // g_panic
 		p.To.Type = obj.TYPE_REG
 		p.To.Reg = REG_BX
@@ -969,9 +975,9 @@ func load_g_cx(ctxt *obj.Link, p *obj.Prog, newprog obj.ProgAlloc) *obj.Prog {
 
 // Append code to p to check for stack split.
 // Appends to (does not overwrite) p.
-// Assumes g is in CX.
+// Assumes g is in rg.
 // Returns last new instruction.
-func stacksplit(ctxt *obj.Link, cursym *obj.LSym, p *obj.Prog, newprog obj.ProgAlloc, framesize int32, textarg int32) *obj.Prog {
+func stacksplit(ctxt *obj.Link, cursym *obj.LSym, p *obj.Prog, newprog obj.ProgAlloc, framesize int32, textarg int32, rg int16) *obj.Prog {
 	cmp := ACMPQ
 	lea := ALEAQ
 	mov := AMOVQ
@@ -993,7 +999,8 @@ func stacksplit(ctxt *obj.Link, cursym *obj.LSym, p *obj.Prog, newprog obj.ProgA
 		p.As = cmp
 		p.From.Type = obj.TYPE_REG
 		p.From.Reg = REG_SP
-		indir_cx(ctxt, &p.To)
+		p.To.Type = obj.TYPE_MEM
+		p.To.Reg = rg
 		p.To.Offset = 2 * int64(ctxt.Arch.PtrSize) // G.stackguard0
 		if cursym.CFunc() {
 			p.To.Offset = 3 * int64(ctxt.Arch.PtrSize) // G.stackguard1
@@ -1021,7 +1028,8 @@ func stacksplit(ctxt *obj.Link, cursym *obj.LSym, p *obj.Prog, newprog obj.ProgA
 		p.As = cmp
 		p.From.Type = obj.TYPE_REG
 		p.From.Reg = REG_AX
-		indir_cx(ctxt, &p.To)
+		p.To.Type = obj.TYPE_MEM
+		p.To.Reg = rg
 		p.To.Offset = 2 * int64(ctxt.Arch.PtrSize) // G.stackguard0
 		if cursym.CFunc() {
 			p.To.Offset = 3 * int64(ctxt.Arch.PtrSize) // G.stackguard1
@@ -1047,7 +1055,8 @@ func stacksplit(ctxt *obj.Link, cursym *obj.LSym, p *obj.Prog, newprog obj.ProgA
 		p = obj.Appendp(p, newprog)
 
 		p.As = mov
-		indir_cx(ctxt, &p.From)
+		p.From.Type = obj.TYPE_MEM
+		p.From.Reg = rg
 		p.From.Offset = 2 * int64(ctxt.Arch.PtrSize) // G.stackguard0
 		if cursym.CFunc() {
 			p.From.Offset = 3 * int64(ctxt.Arch.PtrSize) // G.stackguard1
@@ -1114,7 +1123,8 @@ func stacksplit(ctxt *obj.Link, cursym *obj.LSym, p *obj.Prog, newprog obj.ProgA
 	spfix.Spadj = -framesize
 
 	pcdata := ctxt.EmitEntryStackMap(cursym, spfix, newprog)
-	pcdata = ctxt.StartUnsafePoint(pcdata, newprog)
+	spill := ctxt.StartUnsafePoint(pcdata, newprog)
+	pcdata = ctxt.SpillRegisterArgs(spill, newprog)
 
 	call := obj.Appendp(pcdata, newprog)
 	call.Pos = cursym.Func().Text.Pos
@@ -1139,7 +1149,8 @@ func stacksplit(ctxt *obj.Link, cursym *obj.LSym, p *obj.Prog, newprog obj.ProgA
 		progedit(ctxt, callend.Link, newprog)
 	}
 
-	pcdata = ctxt.EndUnsafePoint(callend, newprog, -1)
+	pcdata = ctxt.UnspillRegisterArgs(callend, newprog)
+	pcdata = ctxt.EndUnsafePoint(pcdata, newprog, -1)
 
 	jmp := obj.Appendp(pcdata, newprog)
 	jmp.As = obj.AJMP
@@ -1147,9 +1158,9 @@ func stacksplit(ctxt *obj.Link, cursym *obj.LSym, p *obj.Prog, newprog obj.ProgA
 	jmp.To.SetTarget(cursym.Func().Text.Link)
 	jmp.Spadj = +framesize
 
-	jls.To.SetTarget(call)
+	jls.To.SetTarget(spill)
 	if q1 != nil {
-		q1.To.SetTarget(call)
+		q1.To.SetTarget(spill)
 	}
 
 	return end
diff --git a/src/cmd/internal/objabi/flag.go b/src/cmd/internal/objabi/flag.go
index 79ad2ccf74..3fd73f3c57 100644
--- a/src/cmd/internal/objabi/flag.go
+++ b/src/cmd/internal/objabi/flag.go
@@ -5,6 +5,7 @@
 package objabi
 
 import (
+	"bytes"
 	"flag"
 	"fmt"
 	"io"
@@ -59,6 +60,9 @@ func expandArgs(in []string) (out []string) {
 				log.Fatal(err)
 			}
 			args := strings.Split(strings.TrimSpace(strings.Replace(string(slurp), "\r", "", -1)), "\n")
+			for i, arg := range args {
+				args[i] = DecodeArg(arg)
+			}
 			out = append(out, expandArgs(args)...)
 		} else if out != nil {
 			out = append(out, s)
@@ -160,3 +164,38 @@ func (f fn1) Set(s string) error {
 }
 
 func (f fn1) String() string { return "" }
+
+// DecodeArg decodes an argument.
+//
+// This function is public for testing with the parallel encoder.
+func DecodeArg(arg string) string {
+	// If no encoding, fastpath out.
+	if !strings.ContainsAny(arg, "\\\n") {
+		return arg
+	}
+
+	// We can't use strings.Builder as this must work at bootstrap.
+	var b bytes.Buffer
+	var wasBS bool
+	for _, r := range arg {
+		if wasBS {
+			switch r {
+			case '\\':
+				b.WriteByte('\\')
+			case 'n':
+				b.WriteByte('\n')
+			default:
+				// This shouldn't happen. The only backslashes that reach here
+				// should encode '\n' and '\\' exclusively.
+				panic("badly formatted input")
+			}
+		} else if r == '\\' {
+			wasBS = true
+			continue
+		} else {
+			b.WriteRune(r)
+		}
+		wasBS = false
+	}
+	return b.String()
+}
diff --git a/src/cmd/internal/objabi/flag_test.go b/src/cmd/internal/objabi/flag_test.go
new file mode 100644
index 0000000000..935b9c2193
--- /dev/null
+++ b/src/cmd/internal/objabi/flag_test.go
@@ -0,0 +1,26 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package objabi
+
+import "testing"
+
+func TestDecodeArg(t *testing.T) {
+	t.Parallel()
+	tests := []struct {
+		arg, want string
+	}{
+		{"", ""},
+		{"hello", "hello"},
+		{"hello\\n", "hello\n"},
+		{"hello\\nthere", "hello\nthere"},
+		{"hello\\\\there", "hello\\there"},
+		{"\\\\\\n", "\\\n"},
+	}
+	for _, test := range tests {
+		if got := DecodeArg(test.arg); got != test.want {
+			t.Errorf("decodoeArg(%q) = %q, want %q", test.arg, got, test.want)
+		}
+	}
+}
diff --git a/src/cmd/internal/objabi/path.go b/src/cmd/internal/objabi/path.go
index fd1c9981c6..1a0784cf7f 100644
--- a/src/cmd/internal/objabi/path.go
+++ b/src/cmd/internal/objabi/path.go
@@ -56,6 +56,8 @@ func IsRuntimePackagePath(pkgpath string) bool {
 		rval = true
 	case "syscall":
 		rval = true
+	case "crypto/x509/internal/macos": // libc function wrappers need to be ABIInternal
+		rval = true
 	default:
 		rval = strings.HasPrefix(pkgpath, "runtime/internal")
 	}
diff --git a/src/cmd/internal/objabi/reloctype.go b/src/cmd/internal/objabi/reloctype.go
index 938954e07a..649f690194 100644
--- a/src/cmd/internal/objabi/reloctype.go
+++ b/src/cmd/internal/objabi/reloctype.go
@@ -156,6 +156,9 @@ const (
 	// R_ARM64_LDST8 sets a LD/ST immediate value to bits [11:0] of a local address.
 	R_ARM64_LDST8
 
+	// R_ARM64_LDST16 sets a LD/ST immediate value to bits [11:1] of a local address.
+	R_ARM64_LDST16
+
 	// R_ARM64_LDST32 sets a LD/ST immediate value to bits [11:2] of a local address.
 	R_ARM64_LDST32
 
diff --git a/src/cmd/internal/objabi/reloctype_string.go b/src/cmd/internal/objabi/reloctype_string.go
index 693d9631f5..658a44f8b8 100644
--- a/src/cmd/internal/objabi/reloctype_string.go
+++ b/src/cmd/internal/objabi/reloctype_string.go
@@ -46,32 +46,33 @@ func _() {
 	_ = x[R_ARM64_GOT-36]
 	_ = x[R_ARM64_PCREL-37]
 	_ = x[R_ARM64_LDST8-38]
-	_ = x[R_ARM64_LDST32-39]
-	_ = x[R_ARM64_LDST64-40]
-	_ = x[R_ARM64_LDST128-41]
-	_ = x[R_POWER_TLS_LE-42]
-	_ = x[R_POWER_TLS_IE-43]
-	_ = x[R_POWER_TLS-44]
-	_ = x[R_ADDRPOWER_DS-45]
-	_ = x[R_ADDRPOWER_GOT-46]
-	_ = x[R_ADDRPOWER_PCREL-47]
-	_ = x[R_ADDRPOWER_TOCREL-48]
-	_ = x[R_ADDRPOWER_TOCREL_DS-49]
-	_ = x[R_RISCV_PCREL_ITYPE-50]
-	_ = x[R_RISCV_PCREL_STYPE-51]
-	_ = x[R_RISCV_TLS_IE_ITYPE-52]
-	_ = x[R_RISCV_TLS_IE_STYPE-53]
-	_ = x[R_PCRELDBL-54]
-	_ = x[R_ADDRMIPSU-55]
-	_ = x[R_ADDRMIPSTLS-56]
-	_ = x[R_ADDRCUOFF-57]
-	_ = x[R_WASMIMPORT-58]
-	_ = x[R_XCOFFREF-59]
+	_ = x[R_ARM64_LDST16-39]
+	_ = x[R_ARM64_LDST32-40]
+	_ = x[R_ARM64_LDST64-41]
+	_ = x[R_ARM64_LDST128-42]
+	_ = x[R_POWER_TLS_LE-43]
+	_ = x[R_POWER_TLS_IE-44]
+	_ = x[R_POWER_TLS-45]
+	_ = x[R_ADDRPOWER_DS-46]
+	_ = x[R_ADDRPOWER_GOT-47]
+	_ = x[R_ADDRPOWER_PCREL-48]
+	_ = x[R_ADDRPOWER_TOCREL-49]
+	_ = x[R_ADDRPOWER_TOCREL_DS-50]
+	_ = x[R_RISCV_PCREL_ITYPE-51]
+	_ = x[R_RISCV_PCREL_STYPE-52]
+	_ = x[R_RISCV_TLS_IE_ITYPE-53]
+	_ = x[R_RISCV_TLS_IE_STYPE-54]
+	_ = x[R_PCRELDBL-55]
+	_ = x[R_ADDRMIPSU-56]
+	_ = x[R_ADDRMIPSTLS-57]
+	_ = x[R_ADDRCUOFF-58]
+	_ = x[R_WASMIMPORT-59]
+	_ = x[R_XCOFFREF-60]
 }
 
-const _RelocType_name = "R_ADDRR_ADDRPOWERR_ADDRARM64R_ADDRMIPSR_ADDROFFR_WEAKADDROFFR_SIZER_CALLR_CALLARMR_CALLARM64R_CALLINDR_CALLPOWERR_CALLMIPSR_CALLRISCVR_CONSTR_PCRELR_TLS_LER_TLS_IER_GOTOFFR_PLT0R_PLT1R_PLT2R_USEFIELDR_USETYPER_USEIFACER_USEIFACEMETHODR_METHODOFFR_POWER_TOCR_GOTPCRELR_JMPMIPSR_DWARFSECREFR_DWARFFILEREFR_ARM64_TLS_LER_ARM64_TLS_IER_ARM64_GOTPCRELR_ARM64_GOTR_ARM64_PCRELR_ARM64_LDST8R_ARM64_LDST32R_ARM64_LDST64R_ARM64_LDST128R_POWER_TLS_LER_POWER_TLS_IER_POWER_TLSR_ADDRPOWER_DSR_ADDRPOWER_GOTR_ADDRPOWER_PCRELR_ADDRPOWER_TOCRELR_ADDRPOWER_TOCREL_DSR_RISCV_PCREL_ITYPER_RISCV_PCREL_STYPER_RISCV_TLS_IE_ITYPER_RISCV_TLS_IE_STYPER_PCRELDBLR_ADDRMIPSUR_ADDRMIPSTLSR_ADDRCUOFFR_WASMIMPORTR_XCOFFREF"
+const _RelocType_name = "R_ADDRR_ADDRPOWERR_ADDRARM64R_ADDRMIPSR_ADDROFFR_WEAKADDROFFR_SIZER_CALLR_CALLARMR_CALLARM64R_CALLINDR_CALLPOWERR_CALLMIPSR_CALLRISCVR_CONSTR_PCRELR_TLS_LER_TLS_IER_GOTOFFR_PLT0R_PLT1R_PLT2R_USEFIELDR_USETYPER_USEIFACER_USEIFACEMETHODR_METHODOFFR_POWER_TOCR_GOTPCRELR_JMPMIPSR_DWARFSECREFR_DWARFFILEREFR_ARM64_TLS_LER_ARM64_TLS_IER_ARM64_GOTPCRELR_ARM64_GOTR_ARM64_PCRELR_ARM64_LDST8R_ARM64_LDST16R_ARM64_LDST32R_ARM64_LDST64R_ARM64_LDST128R_POWER_TLS_LER_POWER_TLS_IER_POWER_TLSR_ADDRPOWER_DSR_ADDRPOWER_GOTR_ADDRPOWER_PCRELR_ADDRPOWER_TOCRELR_ADDRPOWER_TOCREL_DSR_RISCV_PCREL_ITYPER_RISCV_PCREL_STYPER_RISCV_TLS_IE_ITYPER_RISCV_TLS_IE_STYPER_PCRELDBLR_ADDRMIPSUR_ADDRMIPSTLSR_ADDRCUOFFR_WASMIMPORTR_XCOFFREF"
 
-var _RelocType_index = [...]uint16{0, 6, 17, 28, 38, 47, 60, 66, 72, 81, 92, 101, 112, 122, 133, 140, 147, 155, 163, 171, 177, 183, 189, 199, 208, 218, 234, 245, 256, 266, 275, 288, 302, 316, 330, 346, 357, 370, 383, 397, 411, 426, 440, 454, 465, 479, 494, 511, 529, 550, 569, 588, 608, 628, 638, 649, 662, 673, 685, 695}
+var _RelocType_index = [...]uint16{0, 6, 17, 28, 38, 47, 60, 66, 72, 81, 92, 101, 112, 122, 133, 140, 147, 155, 163, 171, 177, 183, 189, 199, 208, 218, 234, 245, 256, 266, 275, 288, 302, 316, 330, 346, 357, 370, 383, 397, 411, 425, 440, 454, 468, 479, 493, 508, 525, 543, 564, 583, 602, 622, 642, 652, 663, 676, 687, 699, 709}
 
 func (i RelocType) String() string {
 	i -= 1
diff --git a/src/cmd/internal/objabi/util.go b/src/cmd/internal/objabi/util.go
index 9479ab2cd9..a73ab479a1 100644
--- a/src/cmd/internal/objabi/util.go
+++ b/src/cmd/internal/objabi/util.go
@@ -40,7 +40,12 @@ const (
 )
 
 func goarm() int {
-	switch v := envOr("GOARM", defaultGOARM); v {
+	def := defaultGOARM
+	if GOOS == "android" && GOARCH == "arm" {
+		// Android arm devices always support GOARM=7.
+		def = "7"
+	}
+	switch v := envOr("GOARM", def); v {
 	case "5":
 		return 5
 	case "6":
diff --git a/src/cmd/internal/objfile/xcoff.go b/src/cmd/internal/objfile/xcoff.go
index d438c80226..d6df4db8f0 100644
--- a/src/cmd/internal/objfile/xcoff.go
+++ b/src/cmd/internal/objfile/xcoff.go
@@ -94,9 +94,7 @@ func (f *xcoffFile) pcln() (textStart uint64, symtab, pclntab []byte, err error)
 	if pclntab, err = loadXCOFFTable(f.xcoff, "runtime.pclntab", "runtime.epclntab"); err != nil {
 		return 0, nil, nil, err
 	}
-	if symtab, err = loadXCOFFTable(f.xcoff, "runtime.symtab", "runtime.esymtab"); err != nil {
-		return 0, nil, nil, err
-	}
+	symtab, _ = loadXCOFFTable(f.xcoff, "runtime.symtab", "runtime.esymtab") // ignore error, this symbol is not useful anyway
 	return textStart, symtab, pclntab, nil
 }
 
diff --git a/src/cmd/internal/pkgpath/pkgpath.go b/src/cmd/internal/pkgpath/pkgpath.go
index 0b24468be6..72e3bdb631 100644
--- a/src/cmd/internal/pkgpath/pkgpath.go
+++ b/src/cmd/internal/pkgpath/pkgpath.go
@@ -10,9 +10,9 @@ import (
 	"bytes"
 	"errors"
 	"fmt"
+	exec "internal/execabs"
 	"io/ioutil"
 	"os"
-	"os/exec"
 	"strings"
 )
 
@@ -50,9 +50,12 @@ func ToSymbolFunc(cmd, tmpdir string) (func(string) string, error) {
 		return nil, err
 	}
 
-	// New mangling: expect go.l..u00e4ufer.Run
-	// Old mangling: expect go.l__ufer.Run
-	if bytes.Contains(buf, []byte("go.l..u00e4ufer.Run")) {
+	// Original mangling: go.l__ufer.Run
+	// Mangling v2: go.l..u00e4ufer.Run
+	// Mangling v3: go_0l_u00e4ufer.Run
+	if bytes.Contains(buf, []byte("go_0l_u00e4ufer.Run")) {
+		return toSymbolV3, nil
+	} else if bytes.Contains(buf, []byte("go.l..u00e4ufer.Run")) {
 		return toSymbolV2, nil
 	} else if bytes.Contains(buf, []byte("go.l__ufer.Run")) {
 		return toSymbolV1, nil
@@ -82,7 +85,7 @@ func toSymbolV1(ppath string) string {
 	return strings.Map(clean, ppath)
 }
 
-// toSymbolV2 converts a package path using the newer mangling scheme.
+// toSymbolV2 converts a package path using the second mangling scheme.
 func toSymbolV2(ppath string) string {
 	// This has to build at boostrap time, so it has to build
 	// with Go 1.4, so we don't use strings.Builder.
@@ -112,3 +115,60 @@ func toSymbolV2(ppath string) string {
 	}
 	return string(bsl)
 }
+
+// v3UnderscoreCodes maps from a character that supports an underscore
+// encoding to the underscore encoding character.
+var v3UnderscoreCodes = map[byte]byte{
+	'_': '_',
+	'.': '0',
+	'/': '1',
+	'*': '2',
+	',': '3',
+	'{': '4',
+	'}': '5',
+	'[': '6',
+	']': '7',
+	'(': '8',
+	')': '9',
+	'"': 'a',
+	' ': 'b',
+	';': 'c',
+}
+
+// toSymbolV3 converts a package path using the third mangling scheme.
+func toSymbolV3(ppath string) string {
+	// This has to build at boostrap time, so it has to build
+	// with Go 1.4, so we don't use strings.Builder.
+	bsl := make([]byte, 0, len(ppath))
+	changed := false
+	for _, c := range ppath {
+		if ('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z') || ('0' <= c && c <= '9') {
+			bsl = append(bsl, byte(c))
+			continue
+		}
+
+		if c < 0x80 {
+			if u, ok := v3UnderscoreCodes[byte(c)]; ok {
+				bsl = append(bsl, '_', u)
+				changed = true
+				continue
+			}
+		}
+
+		var enc string
+		switch {
+		case c < 0x80:
+			enc = fmt.Sprintf("_x%02x", c)
+		case c < 0x10000:
+			enc = fmt.Sprintf("_u%04x", c)
+		default:
+			enc = fmt.Sprintf("_U%08x", c)
+		}
+		bsl = append(bsl, enc...)
+		changed = true
+	}
+	if !changed {
+		return ppath
+	}
+	return string(bsl)
+}
diff --git a/src/cmd/internal/pkgpath/pkgpath_test.go b/src/cmd/internal/pkgpath/pkgpath_test.go
index 7355f81bae..232e803a60 100644
--- a/src/cmd/internal/pkgpath/pkgpath_test.go
+++ b/src/cmd/internal/pkgpath/pkgpath_test.go
@@ -24,6 +24,9 @@ func init() {
 	case "v2":
 		os.Stdout.WriteString(`.string	"go.l..u00e4ufer.Run"`)
 		os.Exit(0)
+	case "v3":
+		os.Stdout.WriteString(`.string	"go_0l_u00e4ufer.Run"`)
+		os.Exit(0)
 	case "error":
 		os.Stdout.WriteString(`unknown string`)
 		os.Exit(0)
@@ -46,6 +49,10 @@ func TestToSymbolFunc(t *testing.T) {
 			mangled: "p..u00e4..u4e16..U0001f703",
 		},
 		{
+			env:     "v3",
+			mangled: "p_u00e4_u4e16_U0001f703",
+		},
+		{
 			env:  "error",
 			fail: true,
 		},
@@ -75,32 +82,37 @@ func TestToSymbolFunc(t *testing.T) {
 }
 
 var symbolTests = []struct {
-	input, v1, v2 string
+	input, v1, v2, v3 string
 }{
 	{
 		"",
 		"",
 		"",
+		"",
 	},
 	{
 		"bytes",
 		"bytes",
 		"bytes",
+		"bytes",
 	},
 	{
 		"net/http",
 		"net_http",
 		"net..z2fhttp",
+		"net_1http",
 	},
 	{
 		"golang.org/x/net/http",
 		"golang_org_x_net_http",
 		"golang.x2eorg..z2fx..z2fnet..z2fhttp",
+		"golang_0org_1x_1net_1http",
 	},
 	{
 		"pä世.🜃",
 		"p____",
 		"p..u00e4..u4e16.x2e..U0001f703",
+		"p_u00e4_u4e16_0_U0001f703",
 	},
 }
 
@@ -119,3 +131,11 @@ func TestV2(t *testing.T) {
 		}
 	}
 }
+
+func TestV3(t *testing.T) {
+	for _, test := range symbolTests {
+		if got, want := toSymbolV3(test.input), test.v3; got != want {
+			t.Errorf("toSymbolV3(%q) = %q, want %q", test.input, got, want)
+		}
+	}
+}