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See also https://golang.org/cl/7520044
R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7533044
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They are moving to code.google.com/p/go.exp.
See also https://golang.org/cl/7463043
R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7456047
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R=gri, rsc
CC=golang-dev
https://golang.org/cl/7422051
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Also: add support for pointer conversions, covered by one new test.
R=gri, bradfitz, dave
CC=golang-dev
https://golang.org/cl/7435047
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Bridge methods for embedded interfaces were
passing the interface twice: once as receiver,
once as first param.
Covered by $GOROOT/test/ddd.go.
Also:
- invent names ("arg%d") for parameters if missing.
- refactoring: move common code for bridge methods into
createParams and emitTailCall.
R=gri
CC=golang-dev
https://golang.org/cl/7437047
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net/http/cookiejar.
This is a straight rename. There are no code changes.
Fixes #1960.
R=rsc, adg
CC=dr.volker.dobler, golang-dev
https://golang.org/cl/7436043
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Completely rethought shift expression type checking.
Instead of attempting to type-check them eagerly, now
delay the checking of untyped constant lhs in non-
constant shifts until the final expression type
becomes clear. Once it is clear, update the respective
expression tree with the final (not untyped) type and
check respective shift lhs' where necessary.
This also cleans up another conundrum: How to report
the type of untyped constants as it changes from
untyped to typed. Now, Context.Expr is only called
for an expresion x once x has received its final
(not untyped) type (for constant initializers, the
final type may still be untyped).
With this CL all remaining std lib packages that
did not typecheck due to shift errors pass now.
TODO: There's a lot of residual stuff that needs
to be cleaned up but with this CL all tests pass
now.
R=adonovan, axwalk
CC=golang-dev
https://golang.org/cl/7381052
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It's not a big deal, but it's easy to fix.
R=dsymonds
CC=dr.volker.dobler, golang-dev
https://golang.org/cl/7425043
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New tests added for port handling and IDNA domains.
A new test case contains several redundant
tests but provides a nice documentation of the
implemented rules for domain handling.
R=nigeltao
CC=golang-dev
https://golang.org/cl/7393070
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Use portable ReadDirent, not linux Getdents.
R=gri
TBR=gri
CC=golang-dev
https://golang.org/cl/7405051
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ssadump:
- permit naming a package (not just *.go files) on command line.
- set BuildSerially flag when setting Log* flags
(Q. should instead the logging functions take a lock?)
Builder:
- fixed bug when calling variadic function with zero '...'-params.
Added regression test.
interp:
- more external functions:
the 'error' interface
bytes.{Equal,IndexByte}
reflect.(Value).{Bool,NumOut,Out}
syscall.{Close,Fstat,Read,Open,Stat,Lstat,Fstat,
Getdents,ParseDirents,Getwd}
- permit comparisons between *Function and *closure.
With this CL, ssadump can now interpret ssadump itself (!),
loading, parsing, typing, SSA-building, and running
println("Hello, World!"). While a fmt-based equivalent still
lacks some external routines, e.g. math/big, I think there are
diminishing returns in expanding the interpreter (and
debugging it is starting to feel like "Inception").
I'm pretty confident this package is now good enough for wider use.
R=gri
CC=golang-dev
https://golang.org/cl/7392053
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While submitting CL 7371051 I accidentally reverted much of CL
7395052. This change restores it.
R=gri
TBR=gri
CC=golang-dev
https://golang.org/cl/7364051
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The correct semantics of named result parameters and deferred
procedures cannot be implemented with the existing Ret
instruction alone, since the required sequence is:
(1) evaluate return operands and parallel-assign them to
named result parameters
(2) invoke deferred procedures
(3) load named result parameters to form result tuple.
We introduce a new 'rundefers' instruction that explicitly
invokes the deferred procedure calls, and we generate code
that follows the sequence above.
Most functions do not use deferred procedures but this cannot
be known in a single pass. So, we add an optimisation to
eliminate redundant 'rundefers'; it is piggybacked on the
existing pass done for "lifting".
Added tests.
R=gri
CC=golang-dev
https://golang.org/cl/7411043
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Details:
- move Builder.nTo1Vars into package => thread-safe.
- add BuildSerially builder mode flag to disable concurrency.
- add Builder.BuildAllPackages method.
Benchmark: BuildAllPackages for $GOROOT/test/append.go drops
to 83ms from 190ms (GOMAXPROCS=8).
R=gri
CC=golang-dev
https://golang.org/cl/7371051
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R=r, dave
CC=golang-dev
https://golang.org/cl/7403055
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which was submitted earlier.
R=r
CC=golang-dev
https://golang.org/cl/7402048
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R=dr.volker.dobler
CC=golang-dev
https://golang.org/cl/7389048
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- better documentation of Check
- better handling of (explicit) internal panics
- gotype: don't stop after 1st error
R=adonovan, r
CC=golang-dev
https://golang.org/cl/7406052
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Actually it already worked since the spec only requires that
the one immediately preceding a for/switch/... be usable as
the target of a break or continue statement.
Added a test.
Also: allocate Function.lblocks on first use.
R=gri
CC=golang-dev
https://golang.org/cl/7365058
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The previous approach desugared the ast.SelectorExpr
to make implicit field selections explicit. But:
1) it was clunky since it required allocating temporary
syntax trees.
2) it was not thread-safe since it required poking
types into the shared type map for the new ASTs.
3) the desugared syntax had no place to represent the
package lexically enclosing each implicit field
selection, so it was as if they all occurred in the
same package as the explicit field selection.
This meant unexported field names changed meaning.
This CL does what I should have done all along: just
generate the SSA instructions directly from the original
AST and the promoted field information.
Also:
- add logStack util for paired start/end log messages.
Useful for debugging crashes.
R=gri
CC=golang-dev
https://golang.org/cl/7395052
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Context.Alignof/Offsetsof/Sizeof now provide means
to customize the type checker for a given platform.
- provide Context.Offsetsof to specify the
offsets of struct fields
- use the correct sizes for ints, uint, uintptrs
in constant computations
- moved all size computations into separate file
(sizes.go)
- fixed a bug with string constant slicing
R=adonovan, axwalk
CC=golang-dev
https://golang.org/cl/7363054
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R=dr.volker.dobler
CC=golang-dev
https://golang.org/cl/7398049
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R=adonovan
CC=golang-dev
https://golang.org/cl/7386052
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We wrap the final '...' argument's type in types.Slice.
Added tests.
Also:
- Function.writeSignature: suppress slice '[]' when printing
variadic arg '...'.
- Eliminate Package.ImportPath field; redundant
w.r.t. Package.Types.Path.
- Use "TODO: (opt|fix)" notation more widely.
- Eliminate many redundant/stale TODOs.
R=gri
CC=golang-dev
https://golang.org/cl/7378057
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By appending to the wrong (always empty) list, only the last
anonymous field was being considered for promotion.
Also:
- eliminated "function-local NamedTypes" TODO; nothing to do.
- fixed Function.DumpTo: printing of anon receivers was "( T)",
now "(T)"; extracted writeSignature into own function.
- eliminated blockNames function;
thanks to BasicBlock.String, "%s" of []*BasicBlock is fine.
- extracted buildReferrers into own function.
exp/ssa can now build its own transitive closure.
R=gri
CC=golang-dev
https://golang.org/cl/7384054
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- append: nothing to do (nonsemantic change).
- delete: now performs correct conversion (+ test).
- emitCompare: nothing to do.
- emitArith (shifts): nothing to do (+ test).
- "banish untyped types": give up on that.
- real, imag: now do correct conversions.
- added comment to interp.go re zero-size values.
R=gri
CC=golang-dev
https://golang.org/cl/7391046
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R=adonovan, minux.ma, alex.brainman, akumar, rminnich
CC=golang-dev, lucio.dere
https://golang.org/cl/7300078
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Update norm and local/collate as well.
R=mpvl
CC=golang-dev
https://golang.org/cl/7395045
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The interpreter's os.Exit now triggers a special panic rather
than kill the test process. (It's semantically dubious, since
it will run deferred routines.) Interpret now returns its
exit code rather than calling os.Exit.
Also:
- disabled parts of a few $GOROOT/tests via os.Getenv("GOSSAINTERP").
- remove unnecessary 'slots' param to external functions; they
are never closures.
Most of the tests are disabled until go/types supports shifts.
They can be reenabled if you patch this workaround:
https://golang.org/cl/7312068
R=iant, bradfitz
CC=golang-dev, gri
https://golang.org/cl/7313062
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By avoiding the need for self-loops following calls to panic,
we reduce the number of basic blocks considerably.
R=gri
CC=golang-dev, iant
https://golang.org/cl/7403043
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Overview: Function.finish() now invokes the "lifting" pass which replaces local allocs and loads and stores to such cells by SSA registers. We use very standard machinery:
(1) we build the dominator tree for the function's control flow graph (CFG) using the "Simple" Lengauer-Tarjan algorithm. (Very "simple" in fact: even simple path compression is not yet implemented.)
In sanity-checking mode, we cross check the dominator tree against an alternative implementation using a simple iterative dataflow algorithm.
This all lives in dom.go, along with some diagnostic printing routines.
(2) we build the dominance frontier for the entire CFG using the Cytron et al algorithm. The DF is represented as a slice of slices, keyed by block index. See buildDomFrontier() in lift.go.
(3) we determine for each Alloc whether it can be lifted: is it only subject to loads and stores? If so, we traverse the iterated dominance frontier (IDF) creating φ-nodes; they are not prepended to the blocks yet.
See liftAlloc() in lift.go.
(4) we perform the SSA renaming algorithm from Cytron et al, replacing all loads to lifted Alloc cells by the value stored by the dominating store operation, and deleting the stores and allocs. See rename() in lift.go.
(5) we eliminate unneeded φ-nodes, then concatenate the remaining ones with the non-deleted instructions of the block into a new slice. We eliminate any lifted allocs from Function.Locals.
To ease reviewing, I have avoided almost all optimisations at this point, though there are many opportunities to explore. These will be easier to understand as follow-up changes.
All the existing tests (pending CL 7313062) pass. (Faster!)
Details:
"NaiveForm" BuilderMode flag suppresses all the new logic.
Exposed as 'ssadump -build=N'.
BasicBlock:
- add .Index field (b.Func[b.Index]==b), simplifying
algorithms such as Kildall-style dataflow with bitvectors.
- rename the Name field to Comment to better reflect its
reduced purpose. It now has a String() method.
- 'dom' field holds dominator tree node; private for now.
- new predIndex method.
- hasPhi is now a method
dom.go:
- domTree: a new struct for a node in a dominator tree.
- buildDomTree builds the dominator tree using the simple
variant Lengauer/Tarjan algorithm with Georgiadis'
bucket optimizations.
- sanityCheckDomTree builds dominance relation using
Kildall-style dataflow and ensures the same result is
obtained.
- printDomTreeDot prints the CFG/DomTree in GraphViz format.
blockopt.go:
- perform a mark/sweep pass to eliminate unreachable
cycles; the previous prune() opt would only eliminate
trivially dead blocks. (Needed for LT algo.)
- using .Index, fuseblocks can now delete fused blocks directly.
- delete prune().
sanity.go: more consistency checks:
- Phi with missing edge value
- local Alloc instructions must appear in Function.Locals.
- BasicBlock.Index, Func consistency
- CFG edges are all intraprocedural.
- detect nils in BasicBlock.Instrs.
- detect Function.Locals with Heap flag set.
- check fn.Blocks is nil if empty.
Also:
- Phi now has Comment field for debugging.
- Fixed bug in Select.Operands()
(took address of temporary copy of field)
- new Literal constructor zeroLiteral().
- algorithms steal private fields Alloc.index,
BasicBlock.gaps to avoid allocating maps.
- We print Function.Locals in DumpTo.
- added profiling support to ssadump.
R=iant, gri
CC=golang-dev
https://golang.org/cl/7229074
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(Offsetof is a function of Alignof and Sizeof.)
- removed IntSize, PtrSize from Context (set Sizeof instead)
- GcImporter needs a Context now (it needs to have
access to Sizeof/Alignof)
- removed exported Size field from Basic (use Sizeof)
- added Offset to Field
- added Alignment, Size to Struct
R=adonovan
CC=golang-dev
https://golang.org/cl/7357046
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This avoids ambiguity and makes the diagnostics closer to
those issued by gc, but it is more verbose since it qualifies
intra-package references.
Without extra context---e.g. a 'from *Package' parameter to
Type.String()---we are forced to err on one side or the other.
Also, cosmetic changes to exp/ssa:
- Remove package-qualification workaround in Function.FullName.
- Always set go/types.Package.Path field to the import path,
since we know the correct path at this point.
- In Function.DumpTo, show variadic '...' and result type info,
and delete now-redundant "# Type: " line.
R=gri
CC=golang-dev
https://golang.org/cl/7325051
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R=golang-dev, dsymonds, bradfitz
CC=golang-dev
https://golang.org/cl/7323073
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Also:
- faster code for example extraction
- simplify handling of command documentation:
all "main" packages are treated as commands
- various minor cleanups along the way
For commands written in Go, any doc.go file containing
documentation must now be part of package main (rather
then package documentation), otherwise the documentation
won't show up in godoc (it will still build, though).
For commands written in C, documentation may still be
in doc.go files defining package documentation, but the
recommended way is to explicitly ignore those files with
a +build ignore constraint to define package main.
Fixes #4806.
R=adg, rsc, dave, bradfitz
CC=golang-dev
https://golang.org/cl/7333046
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side expression evaluation in assignment operations.
R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/7349046
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The current implementation would store all cookies received from
any .com domain under "com" in the entries map if a nil public
suffix list is used in constructing the Jar. This is inefficient.
This CL uses the TLD+1 of the domain if the public suffix list
is nil which has two advantages:
- It uses the entries map efficiently.
- It prevents a host foo.com to set cookies for bar.com.
(It may set the cookie, but it won't be returned to bar.com.)
A domain like www.british-library.uk may still set a domain
cookie for .british-library.uk in this case.
The behavior for a non-nil public suffix list is unchanged, cookies
are stored under eTLD+1 in this case.
R=nigeltao
CC=golang-dev
https://golang.org/cl/7312105
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Re-enable TestUpdateAndDelete, TestExpiration, TestChromiumDomain and
TestChromiumDeletion on Windows.
Sorting of cookies with same path length and same creation
time is done by an additional seqNum field.
This makes the order in which cookies are returned in Cookies
deterministic, even if the system clock is manipulated or on
systems with a low-resolution clock.
The tests now use a synthetic time: This makes cookie testing
reliable in case of bogus system clocks and speeds up the
expiration tests.
R=nigeltao, alex.brainman, dave
CC=golang-dev
https://golang.org/cl/7323063
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More mysteriously broken tests.
TBR=nigeltao
CC=golang-dev
https://golang.org/cl/7342048
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TBR=nigeltao
CC=golang-dev
https://golang.org/cl/7322084
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- use the new AllErrors flag where appropriate
- unless AllErrors is set, eliminate spurious
errors before they are added to the errors list
(it turns out that reporting spurious errors always
leads to too many uninformative errors after all)
R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7323065
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This CL provides the implementation of Cookies and
the complete test suite. Several tests have been ported
from the Chromium project as a cross check.
R=nigeltao, rsc, bradfitz
CC=golang-dev
https://golang.org/cl/7311073
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Unexported field and method names that appear in the
export data (as part of some exported type) are fully
qualified with a package id (path). In some cases, a
package with that id was never exported for any other
use (i.e. only the path is of interest).
We must not create a "real" package in those cases
because we don't have a package name. Entering an
unnamed package into the map of imported packages
makes that package accessible for other imports.
Such a subsequent import may find the unnamed
package in the map, and reuse it. That reused and
imported package is then entered into the importing
file scope, still w/o a name. References to that
package cannot resolved after that. Was bug.
R=adonovan
CC=golang-dev
https://golang.org/cl/7307112
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Operands returns the SSA values used by an instruction.
Referrers returns the SSA instructions that use a value, for
some values. These will be used for SSA renaming, to follow.
R=iant, gri
CC=golang-dev
https://golang.org/cl/7312090
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R=iant
CC=golang-dev
https://golang.org/cl/7307105
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into separate package. This allows this code to be shared
with the search package without the need for these two to use
the same tables.
Adjusted various files accordingly.
R=rsc
CC=golang-dev
https://golang.org/cl/7213044
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Fixes #4744.
R=adonovan
CC=golang-dev
https://golang.org/cl/7305080
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The lowering of ast.RangeStmt now has three distinct cases:
1) rangeIter for maps and strings; approximately:
it = range x
for {
k, v, ok = next it
if !ok { break }
...
}
The Range instruction and the interpreter's "iter"
datatype are now restricted to these types.
2) rangeChan for channels; approximately:
for {
k, ok = <-x
if !ok { break }
...
}
3) rangeIndexed for slices, arrays, and *array; approximately:
for k, l = 0, len(x); k < l; k++ {
v = x[k]
...
}
In all cases we now evaluate the side effects of the range expression
exactly once, per comments on http://code.google.com/p/go/issues/detail?id=4644.
However the exact spec wording is still being discussed in
https://golang.org/cl/7307083/. Further (small)
changes may be required once the dust settles.
R=iant
CC=golang-dev
https://golang.org/cl/7303074
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sub-repo.
The matching change is at https://golang.org/cl/7310063
The rationale was discussed at
https://groups.google.com/d/topic/golang-nuts/Qq5hTQyPuLg/discussion
R=adg, dave
CC=golang-dev
https://golang.org/cl/7317043
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This CL provides the rest of the SetCookies code as well as
some test infrastructure which will be used to test also
the Cookies method. This test infrastructure is optimized
for readability and tries to make it easy to review table
driven test cases.
Tests for all the different corner cases of SetCookies
will be provided in a separate CL.
R=nigeltao, rsc, bradfitz
CC=golang-dev
https://golang.org/cl/7306054
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