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After LoadFull, we'll be using sym.Symbols mostly. We still need
the loader information for symbol index mappings and name
lookups, but not much else. Free some memory.
Linking cmd/compile,
name old time/op new time/op delta
Loadlibfull_GC 44.5M ± 0% 35.8M ± 0% -19.66% (p=0.008 n=5+5)
Archive_GC 46.4M ± 0% 37.6M ± 0% -18.89% (p=0.008 n=5+5)
Linking cmd/compile with external linking,
name old time/op new time/op delta
Loadlibfull_GC 82.5M ± 0% 57.4M ± 0% -30.41% (p=0.008 n=5+5)
Archive_GC 86.8M ± 0% 61.7M ± 0% -28.90% (p=0.008 n=5+5)
Change-Id: I6859d488172ef8968918b86de527fbfed6832ebf
Reviewed-on: https://go-review.googlesource.com/c/go/+/230300
Run-TryBot: Cherry Zhang <cherryyz@google.com>
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Reviewed-by: Jeremy Faller <jeremy@golang.org>
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Support external linking for the new reloc pass as well, and
enable it on AMD64 and 386.
Change-Id: Ia71aec3d7c14e9d661e0748d2e988f29f220d1e1
Reviewed-on: https://go-review.googlesource.com/c/go/+/230308
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Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
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Remove 'Sub' field from sym.Symbol, replacing uses (those downstream of
loadlibfull) with loader method calls.
NB: removing the Outer field will have to wait for now; it is accessed
in archreloc methods that don't have access to link ctxt or loader
currently.
Change-Id: I2abe5906fc169c64b2ab7d5ad213619bea5a17c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/230617
Run-TryBot: Than McIntosh <thanm@google.com>
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Reviewed-by: Jeremy Faller <jeremy@golang.org>
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linking
Only enabled for AMD64 when internal linking for now.
Change-Id: I2aa9ee47c0f7413ea7bbcdd31b8317c14220bba3
Reviewed-on: https://go-review.googlesource.com/c/go/+/230302
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Change-Id: I8675f56a7f7f18653754eb87b95f5a7aec31ad74
Reviewed-on: https://go-review.googlesource.com/c/go/+/229860
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Reviewed-by: Jeremy Faller <jeremy@golang.org>
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Remove sym.Symbol 'Unit' field, replacing accesses to the field with
calls into the loader instead.
Change-Id: Ia1abd4c3d93036705dd624a49cb3d9cbe6a5188b
Reviewed-on: https://go-review.googlesource.com/c/go/+/230307
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
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Add new get/set methods to the loader for recording the ELF symbol
index for a given loader symbol. These are map-based, since it is
expected that many/most symbols will not need an ELF symbol table
entry.
Change-Id: I1102c3637775515ccc6650118e8b059468a2c3ea
Reviewed-on: https://go-review.googlesource.com/c/go/+/230461
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Remove the 'Gotype' field from sym.Symbol, as it is now no longer
used. Store the loader.Sym for a symbol as a field in sym.Symbol
("SymIdx"). Then remove sym.Symbol 'File' field, and replace the field
accesses in question with calls into the loader instead.
Change-Id: I01c5504425006b8d3fe77fac2b69a86e198c7a5a
Reviewed-on: https://go-review.googlesource.com/c/go/+/230304
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This change is just the mechanical work of moving the wavefront past
address.
Change-Id: I519ec49fa8ba50760c7d23fc084fcd3bb0544546
Reviewed-on: https://go-review.googlesource.com/c/go/+/229700
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Replace remaining uses with loader.Syms. Reduces some memory
usage.
Change-Id: I6f295b42b8cd734c6c18f08c61a5473506675075
Reviewed-on: https://go-review.googlesource.com/c/go/+/229992
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
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Sort DynidSyms to ensure a deterministic build.
Fix Solaris build.
Change-Id: I6c01cb3dec5e46b3d881e720e3c2079643b5c7c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/230277
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Correctly propagate ... arguments. (Maybe vet should warn on it?)
Reviewed-on: https://go-review.googlesource.com/c/go/+/230017
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Change-Id: Ife56dc2321847cdaf0caea3142c2c7dad8b5924d
Reviewed-on: https://go-review.googlesource.com/c/go/+/230027
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Previous CL introduced index fingerprint in the object files.
This CL implements the second part: checking fingerprint
consistency in the linker when packages are loaded.
Change-Id: I05dd4c4045a65adfd95e77b625d6c75a7a70e4f1
Reviewed-on: https://go-review.googlesource.com/c/go/+/229618
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The new object files use indices for symbol references, instead
of names. Fundamental to the design, it requires that the
importing and imported packages have consistent view of symbol
indices. The Go command should already ensure this, when using
"go build". But in case it goes wrong, it could lead to obscure
errors like run-time crashes. It would be better to check the
index consistency at build time.
To do that, we add a fingerprint to each object file, which is
a hash of symbol indices. In the object file it records the
fingerprints of all imported packages, as well as its own
fingerprint. At link time, the linker checks that a package's
fingerprint matches the fingerprint recorded in the importing
packages, and issue an error if they don't match.
This CL does the first part: introducing the fingerprint in the
object file, and propagating fingerprints through
importing/exporting by the compiler. It is not yet used by the
linker. Next CL will do.
Change-Id: I0aa372da652e4afb11f2867cb71689a3e3f9966e
Reviewed-on: https://go-review.googlesource.com/c/go/+/229617
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
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This patch begins the work of converting the linker's dodata phase to
work with loader APIs. Passes all.bash on linux/amd64, but hasn't been
tested on anything else (more arch-specific code needs to be written).
Use of the new dodata() phase is currently gated by a temporary
command line flag ("-newdodata"), and there is code in the linker's
main routine to insure that we only use the new version for the right
GOOS/GOARCH (currently restricted to ELF + AMD64).
Change-Id: Ied3966677d2a450bc3e0990e0f519b3fceaab806
Reviewed-on: https://go-review.googlesource.com/c/go/+/229706
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Move the guts of ctxt.Errorf into loader.Loader, so that we can make
calls to it from functions that have a "*loader.Loader" available but
not a "ctxt *Link". This is needed to start converting hooks like
"adddynrel" in the arch-specific portions of the linker to use loader
APIs.
Change-Id: Ieedd4583b66504be0e77d7f3fbadafe0d2307a69
Reviewed-on: https://go-review.googlesource.com/c/go/+/229497
Run-TryBot: Than McIntosh <thanm@google.com>
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Clients may need to invoke the loader.Reloc2.SetType method to reset
the type of a relocation from external flavor to internal flavor,
meaning that the external type add-in needs to be zeroed (this is
needed when adding dynsym entries).
Add a new SymbolBuider method to support mutating the type of a reloc
for an external symbol, so that the external type can be changed as
well (Reloc2 doesn't have access to that). Also add similar methods
for updating target symbol and addend, so as to have a consistent
interface for ext reloc mutation.
Change-Id: I8e26cdae0a0f353019acba5f9c8a0506e3970266
Reviewed-on: https://go-review.googlesource.com/c/go/+/229604
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
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Allow for the possibility that a client could call newExtSym(), then
ask for the section of the new sym before SetSectSym is called on it
(check in SymSect for this case).
Change-Id: I7bd78e7b3b7618943705b616f62ea78c4a1b68d0
Reviewed-on: https://go-review.googlesource.com/c/go/+/229603
Reviewed-by: Jeremy Faller <jeremy@golang.org>
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The code that runs as a part of loadlibfull converts the linker's
outer/sub state and sets the sym.Symbol AttrSubSymbol if a symbol has
both A) an outer sym, and B) is listed as a sub-symbol by some other
symbol.
Make sure that we have the same logic in the original loader method,
since we need to use it as part of dodata() prior to loadlibfull.
Change-Id: I200adab741d778a6ba821419e8ea131ad19375bc
Reviewed-on: https://go-review.googlesource.com/c/go/+/229440
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Change the timing for preprocessing of integer/floating point constant
symbols so that we populate them with content at an earlier stage.
This is needed to allow them can be picked up by the loader-API
version of dodata().
Change-Id: Icf09f4f4b318b4f77e11d4a0f0a9cbecd76a1d6b
Reviewed-on: https://go-review.googlesource.com/c/go/+/229438
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It is no longer needed as we have converted the fieldtrack pass
to using the loader.
Also free loader.Reachparent after we are done with it.
Change-Id: Ibc4b29f282e1e4aea363a1b549755e31f84b0295
Reviewed-on: https://go-review.googlesource.com/c/go/+/229322
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Currently, we use a dense array to store symbol's sections. The
array element is a *sym.Section, which takes 8 bytes per symbol
on a 64-bit machine. And the array is created upfront.
To reduce memory usage, use a 16-bit index for sections, so we
store 2 bytes per symbol. The array is pointerless, reducing GC
work. Also create the array lazily.
This reduces some memory usage: linking cmd/compile,
name old alloc/op new alloc/op delta
Loadlib_GC 42.1MB ± 0% 36.2MB ± 0% -14.01% (p=0.008 n=5+5)
name old live-B new live-B delta
Loadlib_GC 16.8M ± 0% 15.4M ± 0% -8.36% (p=0.008 n=5+5)
Archive_GC 98.2M ± 0% 97.2M ± 0% -1.02% (p=0.008 n=5+5) # at the end
Change-Id: If8c41eded8859660bca648c5e6fdf5830810fbf6
Reviewed-on: https://go-review.googlesource.com/c/go/+/229306
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
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This is more or less a direct translation, to get things going.
There are more things we can do to make it better, especially on
the handling of container symbols.
Change-Id: I11a0087e402be8d42b9d06869385ead531755272
Reviewed-on: https://go-review.googlesource.com/c/go/+/229125
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deadcode's been completely replaced. Make its death official.
Change-Id: I85f1e3968463f216b8bce2fb7217c3b51641939f
Reviewed-on: https://go-review.googlesource.com/c/go/+/229002
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lib.Textp2 is used to assemble the global Textp2. It is not used
after that point. Free some memory.
Slightly reduces allocation: for linking cmd/compile,
Linksetup_GC 1.10MB ± 0% 0.84MB ± 0% -23.43% (p=0.008 n=5+5)
Change-Id: Iec4572e282655306d5ff3e490f8855d479e45acf
Reviewed-on: https://go-review.googlesource.com/c/go/+/228481
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The types funcAllocInfo and funcInfoSym are no longer referenced.
Fixes #38456.
Change-Id: Icd32445f6027429f4a2781554d2086790ebe5daf
Reviewed-on: https://go-review.googlesource.com/c/go/+/228318
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Hoist dwarfGenerateDebugSyms call up out of dodata to before
loadlibfull. This required a couple of small tweaks to the
loader and to loadlibfull.
Change-Id: I48ffb450d2e48b9e55775b73a6debcd27dbb7b9c
Reviewed-on: https://go-review.googlesource.com/c/go/+/228221
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lib.Textp was used for text address assignment and trampoline
insertion. Now that it has been converted to using the loader,
no need to populate lib.Textp.
Port the logic of canonicalizing dupok symbol's package to the
loader.
unit.Textp was used for DWARF generation, which has also been
converted to using the loader.
Change-Id: I22d4dd30a52a29dd5b1b7b795d43a19f6215e4ac
Reviewed-on: https://go-review.googlesource.com/c/go/+/228140
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As we have converted the pclntab generation, FuncInfo is not
needed after. No need to load it.
Change-Id: Idcfe4da44dfc94d8d44509d12179b354a2e295e9
Reviewed-on: https://go-review.googlesource.com/c/go/+/228139
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Remove the loader's AttrContainer method, since it is no longer
needed. All of the code in the linker that used s.Attr.Container() is
now upstream of loadlibfull(), and the code in question now uses local
bitmaps to keep track of container text symbols as opposed to loader
methods.
Change-Id: Iae956d24bef2776e181c3b8208476dcb0b9a2916
Reviewed-on: https://go-review.googlesource.com/c/go/+/227959
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If a Go symbol is cloned to external, we should preserve its Aux
symbols for FuncInfo, etc.. We already do this in
loader.FuncInfo, but not in FuncInfo.Funcdata. Do it in the
latter as well. In fact, since FuncInfo and Funcdata should use
the same set of auxs, just record the auxs and reuse.
Should fix PPC64 build.
Change-Id: Iab9020eaca15d98fe3bb41f50f0d5bdb4999e8c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/227848
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
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Rename
Sym2 -> Sym
Reloc2 -> Reloc
Aux2 -> Aux
Also the Reader methods.
Change-Id: I49f29e2d1cb480f5309e01d7a74b5e0897d826fb
Reviewed-on: https://go-review.googlesource.com/c/go/+/227900
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Rework the linker's pcln phase to work with the new loader. As part of
this set of changes the handling of "go.file..." symbols has been
revised somewhat -- previously they were treated as always live in the
loader, and now we no longer do this.
The original plan had been to have the new implementation generate
nameless "inltree" symbols, however the plan now is to keep them
named for now and convert them to nameless in a subsequent patch.
Change-Id: If71c93ff1f146dbb63b6ee2546308acdc94b643c
Reviewed-on: https://go-review.googlesource.com/c/go/+/227759
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Expand the methods for the FuncInfo helper, to support reading the
contents of an object file FuncInfo aux symbol using the new style
(that is to say, incrementally and without allocating slices to hold
the various bits).
Change-Id: I953d72c4a53f98c840e6b25b08fd33dc4a833dd5
Reviewed-on: https://go-review.googlesource.com/c/go/+/227585
Reviewed-by: Cherry Zhang <cherryyz@google.com>
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Change-Id: If861409a5cc4e398496199a89498a141f106f44f
Reviewed-on: https://go-review.googlesource.com/c/go/+/227762
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Implement text address assignment and trampoline generation using
the loader.
Note: the trampoline insertion part doesn't actually work. It
also needs to propagate Aux symbols for external symbols in
LoadFull. But it won't be needed after converting pclntab
generation, so I'll leave it out for now. This could break
linking large binaries on PPC64 and ARM.
Change-Id: Ie46a35b25d7c027983dd877207cfa8f67c32530b
Reviewed-on: https://go-review.googlesource.com/c/go/+/227482
Reviewed-by: Than McIntosh <thanm@google.com>
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SymFile, derived from sym.Symbol.File, is supposed to return the
package path, instead of the file name (arguably the name is
confusing). Make it so, and rename it to SymPkg.
Change-Id: I67bcd12f67cea271f2a2ce3c5724e5d228f5b2f0
Reviewed-on: https://go-review.googlesource.com/c/go/+/227481
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Reviewed-by: Than McIntosh <thanm@google.com>
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Remove some extra sanity-checking code from the loader's RelocVariant
method, since it was yielding a slowdown of 1-2% linking kubernetes
hyperkube (once again a reminder that relocation processing is a very
performance-sensitive part of the linker).
Change-Id: Ifbc0662f3f96c5f54131103ce6f7439ecfb9b9dc
Reviewed-on: https://go-review.googlesource.com/c/go/+/227477
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Add support to the loader for getting/setting the 'variant' property
of a symbol relocation. The variant property handles unusual or
infrequently used relocations that have both a type and a variant of
that type (this is needed for S390).
In the sym.Symbol world, a relocation variant is a field on the
'relocExt' extension that is part of sym.Reloc. In this new
implementation for the loader, reloc variants are stored in a side
table (a map) in the loader, and accessed via loader methods.
Change-Id: I62bf54ae7ff6d500c0ea8d2dbe759b2431087378
Reviewed-on: https://go-review.googlesource.com/c/go/+/227018
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
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This ports CL 226997 to the dev.link branch.
- The assembler part and old object file writing are unchanged.
- Changes to cmd/link are applied to cmd/oldlink.
- Add alignment field to new object files for the new linker.
Change-Id: Id00f323ae5bdd86b2709a702ee28bcaa9ba962f8
Reviewed-on: https://go-review.googlesource.com/c/go/+/227025
Reviewed-by: Than McIntosh <thanm@google.com>
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Along the line with Reloc and Aux, use new-style accessors for
the Sym type. They avoid reading unnecessary fields, and also
look nicer (to me).
Change-Id: Ie37c5149a6edb2184724b3dfa26952015e74c085
Reviewed-on: https://go-review.googlesource.com/c/go/+/226798
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
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The Count field in Relocs type is always equal to len(rs). Unify
them.
Change-Id: Ic77288ea58b61a98482b218e051d81047d0ddd88
Reviewed-on: https://go-review.googlesource.com/c/go/+/226717
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Store external relocations in (almost) the same format as the Go
objects, so we can handle them more uniformly.
There is a small speedup:
(linking cmd/compile)
Deadcode 67.8ms ± 3% 61.1ms ± 3% -9.94% (p=0.008 n=5+5)
Dostkcheck 41.2ms ± 2% 38.8ms ± 3% -5.99% (p=0.008 n=5+5)
Change-Id: I8616e10b26235904201d6c9465f5ae32a49c9949
Reviewed-on: https://go-review.googlesource.com/c/go/+/226365
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Add support for migrating over the symbol Dynid property
when converting loader.Sym symbols to sym.Symbol.
Change-Id: Icc3b91b4adcae6f2ede7d915bb674cc206025217
Reviewed-on: https://go-review.googlesource.com/c/go/+/226360
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
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And remove the old-style one.
Change-Id: Ia6c84448108dd1da68451df2221c7c1005c45a0d
Reviewed-on: https://go-review.googlesource.com/c/go/+/226364
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
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This gives some small speedup:
(linking cmd/compile)
Loadlibfull 77.8ms ± 6% 68.6ms ± 5% -11.88% (p=0.008 n=5+5)
Also convert some Relocs.At to At2, which should have been done
earlier.
Change-Id: I2a66aeb5857234c6e645e1b23380149cffc8221f
Reviewed-on: https://go-review.googlesource.com/c/go/+/226363
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
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When using the new(old) linker but an old(new) object file is
found, give a better error message.
Change-Id: I94786f1a4b527c15c4f5b00457eab60d215a72a0
Reviewed-on: https://go-review.googlesource.com/c/go/+/225457
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
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Add accessor methods to get at the symbol {plt,got} value for
PE symbols. Fix a bug in the loaders SetPlt/SetGot methods.
Change-Id: I975bd6b86122622b206487c8798f8290ecd25a57
Reviewed-on: https://go-review.googlesource.com/c/go/+/225199
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
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sym.Symbols
Currently, in LoadFull we migrate a symbol's Value to sym.Symbol
only for external symbols. And symbol's Align is not migrated at
all. As we move LoadFull forward, there are already places where
we set symbol's Value and Align (e.g. in doelf). Migrate them
correctly.
Currently I think we only set them on external symbols, but as
we move forward I think we'll need to set them on Go symbols as
well.
Change-Id: I63e97e38fc08b653ba9faefe15697944faf21bed
Reviewed-on: https://go-review.googlesource.com/c/go/+/225658
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
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Change-Id: Ic1e4ed6c14e049b1ba2f7c00f986433ab7ebe932
Reviewed-on: https://go-review.googlesource.com/c/go/+/225202
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
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