| Age | Commit message (Collapse) | Author |
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If we want to break up package gc at all, we will need to move
the compiler IR it defines into a separate package that can be
imported by packages that gc itself imports. This CL does that.
It also removes the TINT8 etc aliases so that all code is clear
about which package things are coming from.
This CL is automatically generated by the script below.
See the comments in the script for details about the changes.
[git-generate]
cd src/cmd/compile/internal/gc
rf '
# These names were never fully qualified
# when the types package was added.
# Do it now, to avoid confusion about where they live.
inline -rm \
Txxx \
TINT8 \
TUINT8 \
TINT16 \
TUINT16 \
TINT32 \
TUINT32 \
TINT64 \
TUINT64 \
TINT \
TUINT \
TUINTPTR \
TCOMPLEX64 \
TCOMPLEX128 \
TFLOAT32 \
TFLOAT64 \
TBOOL \
TPTR \
TFUNC \
TSLICE \
TARRAY \
TSTRUCT \
TCHAN \
TMAP \
TINTER \
TFORW \
TANY \
TSTRING \
TUNSAFEPTR \
TIDEAL \
TNIL \
TBLANK \
TFUNCARGS \
TCHANARGS \
NTYPE \
BADWIDTH
# esc.go and escape.go do not need to be split.
# Append esc.go onto the end of escape.go.
mv esc.go escape.go
# Pull out the type format installation from func Main,
# so it can be carried into package ir.
mv Main:/Sconv.=/-0,/TypeLinkSym/-1 InstallTypeFormats
# Names that need to be exported for use by code left in gc.
mv Isconst IsConst
mv asNode AsNode
mv asNodes AsNodes
mv asTypesNode AsTypesNode
mv basicnames BasicTypeNames
mv builtinpkg BuiltinPkg
mv consttype ConstType
mv dumplist DumpList
mv fdumplist FDumpList
mv fmtMode FmtMode
mv goopnames OpNames
mv inspect Inspect
mv inspectList InspectList
mv localpkg LocalPkg
mv nblank BlankNode
mv numImport NumImport
mv opprec OpPrec
mv origSym OrigSym
mv stmtwithinit StmtWithInit
mv dump DumpAny
mv fdump FDumpAny
mv nod Nod
mv nodl NodAt
mv newname NewName
mv newnamel NewNameAt
mv assertRepresents AssertValidTypeForConst
mv represents ValidTypeForConst
mv nodlit NewLiteral
# Types and fields that need to be exported for use by gc.
mv nowritebarrierrecCallSym SymAndPos
mv SymAndPos.lineno SymAndPos.Pos
mv SymAndPos.target SymAndPos.Sym
mv Func.lsym Func.LSym
mv Func.setWBPos Func.SetWBPos
mv Func.numReturns Func.NumReturns
mv Func.numDefers Func.NumDefers
mv Func.nwbrCalls Func.NWBRCalls
# initLSym is an algorithm left behind in gc,
# not an operation on Func itself.
mv Func.initLSym initLSym
mv nodeQueue NodeQueue
mv NodeQueue.empty NodeQueue.Empty
mv NodeQueue.popLeft NodeQueue.PopLeft
mv NodeQueue.pushRight NodeQueue.PushRight
# Many methods on Node are actually algorithms that
# would apply to any node implementation.
# Those become plain functions.
mv Node.funcname FuncName
mv Node.isBlank IsBlank
mv Node.isGoConst isGoConst
mv Node.isNil IsNil
mv Node.isParamHeapCopy isParamHeapCopy
mv Node.isParamStackCopy isParamStackCopy
mv Node.isSimpleName isSimpleName
mv Node.mayBeShared MayBeShared
mv Node.pkgFuncName PkgFuncName
mv Node.backingArrayPtrLen backingArrayPtrLen
mv Node.isterminating isTermNode
mv Node.labeledControl labeledControl
mv Nodes.isterminating isTermNodes
mv Nodes.sigerr fmtSignature
mv Node.MethodName methodExprName
mv Node.MethodFunc methodExprFunc
mv Node.IsMethod IsMethod
# Every node will need to implement RawCopy;
# Copy and SepCopy algorithms will use it.
mv Node.rawcopy Node.RawCopy
mv Node.copy Copy
mv Node.sepcopy SepCopy
# Extract Node.Format method body into func FmtNode,
# but leave method wrapper behind.
mv Node.Format:0,$ FmtNode
# Formatting helpers that will apply to all node implementations.
mv Node.Line Line
mv Node.exprfmt exprFmt
mv Node.jconv jconvFmt
mv Node.modeString modeString
mv Node.nconv nconvFmt
mv Node.nodedump nodeDumpFmt
mv Node.nodefmt nodeFmt
mv Node.stmtfmt stmtFmt
# Constant support needed for code moving to ir.
mv okforconst OKForConst
mv vconv FmtConst
mv int64Val Int64Val
mv float64Val Float64Val
mv Node.ValueInterface ConstValue
# Organize code into files.
mv LocalPkg BuiltinPkg ir.go
mv NumImport InstallTypeFormats Line fmt.go
mv syntax.go Nod NodAt NewNameAt Class Pxxx PragmaFlag Nointerface SymAndPos \
AsNode AsTypesNode BlankNode OrigSym \
Node.SliceBounds Node.SetSliceBounds Op.IsSlice3 \
IsConst Node.Int64Val Node.CanInt64 Node.Uint64Val Node.BoolVal Node.StringVal \
Node.RawCopy SepCopy Copy \
IsNil IsBlank IsMethod \
Node.Typ Node.StorageClass node.go
mv ConstType ConstValue Int64Val Float64Val AssertValidTypeForConst ValidTypeForConst NewLiteral idealType OKForConst val.go
# Move files to new ir package.
mv bitset.go class_string.go dump.go fmt.go \
ir.go node.go op_string.go val.go \
sizeof_test.go cmd/compile/internal/ir
'
: # fix mkbuiltin.go to generate the changes made to builtin.go during rf
sed -i '' '
s/\[T/[types.T/g
s/\*Node/*ir.Node/g
/internal\/types/c \
fmt.Fprintln(&b, `import (`) \
fmt.Fprintln(&b, ` "cmd/compile/internal/ir"`) \
fmt.Fprintln(&b, ` "cmd/compile/internal/types"`) \
fmt.Fprintln(&b, `)`)
' mkbuiltin.go
gofmt -w mkbuiltin.go
: # update cmd/dist to add internal/ir
cd ../../../dist
sed -i '' '/compile.internal.gc/a\
"cmd/compile/internal/ir",
' buildtool.go
gofmt -w buildtool.go
: # update cmd/compile TestFormats
cd ../..
go install std cmd
cd cmd/compile
go test -u || go test # first one updates but fails; second passes
Change-Id: I5f7caf6b20629b51970279e81231a3574d5b51db
Reviewed-on: https://go-review.googlesource.com/c/go/+/273008
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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Move Flag, Debug, Ctxt, Exit, and error messages to
new package cmd/compile/internal/base.
These are the core functionality that everything in gc uses
and which otherwise prevent splitting any other code
out of gc into different packages.
A minor milestone: the compiler source code
no longer contains the string "yy".
[git-generate]
cd src/cmd/compile/internal/gc
rf '
mv atExit AtExit
mv Ctxt atExitFuncs AtExit Exit base.go
mv lineno Pos
mv linestr FmtPos
mv flusherrors FlushErrors
mv yyerror Errorf
mv yyerrorl ErrorfAt
mv yyerrorv ErrorfVers
mv noder.yyerrorpos noder.errorAt
mv Warnl WarnfAt
mv errorexit ErrorExit
mv base.go debug.go flag.go print.go cmd/compile/internal/base
'
: # update comments
sed -i '' 's/yyerrorl/ErrorfAt/g; s/yyerror/Errorf/g' *.go
: # bootstrap.go is not built by default so invisible to rf
sed -i '' 's/Fatalf/base.Fatalf/' bootstrap.go
goimports -w bootstrap.go
: # update cmd/dist to add internal/base
cd ../../../dist
sed -i '' '/internal.amd64/a\
"cmd/compile/internal/base",
' buildtool.go
gofmt -w buildtool.go
Change-Id: I59903c7084222d6eaee38823fd222159ba24a31a
Reviewed-on: https://go-review.googlesource.com/c/go/+/272250
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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The flag values have grown fairly haphazard, with no organization
or even common naming convention. This CL moves all flag values
into the Flag struct (formerly misnamed Debug), except for a few
that live in Ctxt fields instead.
This CL is entirely automated changes.
A followup CL will make a few manual cleanups, leaving this CL
completely automated and easier to regenerate during merge
conflicts.
Cleaning up flags is necessary because the printing routines
look at some of them, and the printing routines need to move
out of package gc to a new package shared by gc and any
other packages that split out of gc.
[git-generate]
cd src/cmd/compile/internal/gc
rf '
mv Debug Flag
mv DebugFlags Flags
mv Flags.e Flags.LowerE
mv Flags.h Flags.LowerH
mv Flags.j Flags.LowerJ
mv Flags.l Flags.LowerL
mv Flags.m Flags.LowerM
mv Flags.r Flags.LowerR
mv Flags.w Flags.LowerW
mv Flags.P Flags.Percent
mv compiling_runtime Flag.CompilingRuntime
mv compiling_std Flag.Std
mv localimport Flag.D
mv asmhdr Flag.AsmHdr
mv buildid Flag.BuildID
mv nBackendWorkers Flag.LowerC
mv pure_go Flag.Complete
mv debugstr Flag.LowerD
mv flagDWARF Flag.Dwarf
mv genDwarfInline Flag.GenDwarfInl
mv flag_installsuffix Flag.InstallSuffix
mv flag_lang Flag.Lang
mv linkobj Flag.LinkObj
mv debuglive Flag.Live
mv flag_msan Flag.MSan
mv nolocalimports Flag.NoLocalImports
mv outfile Flag.LowerO
mv myimportpath Ctxt.Pkgpath
mv writearchive Flag.Pack
mv flag_race Flag.Race
mv spectre Flag.Spectre
mv trace Flag.LowerT
mv pathPrefix Flag.TrimPath
mv Debug_vlog Ctxt.Debugvlog
mv use_writebarrier Flag.WB
mv Main.flag_shared Flag.Shared
mv Main.flag_dynlink Flag.Dynlink
mv Main.goversion Flag.GoVersion
mv Main.symabisPath Flag.SymABIs
mv cpuprofile Flag.CPUProfile
mv memprofile Flag.MemProfile
mv traceprofile Flag.TraceProfile
mv blockprofile Flag.BlockProfile
mv mutexprofile Flag.MutexProfile
mv benchfile Flag.Bench
mv Main.smallFrames Flag.SmallFrames
mv Main.jsonLogOpt Flag.JSON
add Flag:$ \
Cfg struct{}
mv embedCfg Flag.Cfg.Embed
mv idirs Flag.Cfg.ImportDirs
mv importMap Flag.Cfg.ImportMap
mv packageFile Flag.Cfg.PackageFile
mv spectreIndex Flag.Cfg.SpectreIndex
mv addidir addImportDir
mv main.go:/Wasm/-0,/ssaDump/-3 ParseFlags
mv usage Flag Flags ParseFlags \
concurrentFlagOk concurrentBackendAllowed \
addImportDir addImportMap \
readImportCfg readEmbedCfg \
flag.go
# Remove //go:generate line copied from main.go
# along with two self-assignments from the merge.
rm flag.go:/go:generate/-+ \
flag.go:/Ctxt.Pkgpath = Ctxt.Pkgpath/-+ \
flag.go:/Ctxt.Debugvlog = Ctxt.Debugvlog/-+
'
Change-Id: I10431c15fe7d9f48024d53141d4224d957dbf334
Reviewed-on: https://go-review.googlesource.com/c/go/+/271667
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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Updates #15756
Updates #19822
Change-Id: I98b17dcbbfd80e7e164b0523185382175fe2d89b
Reviewed-on: https://go-review.googlesource.com/39554
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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Updates #15756
Change-Id: Ic635812b324af926333122c02908cebfb24d7bce
Reviewed-on: https://go-review.googlesource.com/39208
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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In order to generate accurate tracebacks, the runtime needs to know the
inlined call stack for a given PC. This creates two tables per function
for this purpose. The first table is the inlining tree (stored in the
function's funcdata), which has a node containing the file, line, and
function name for every inlined call. The second table is a PC-value
table that maps each PC to a node in the inlining tree (or -1 if the PC
is not the result of inlining).
To give the appearance that inlining hasn't happened, the runtime also
needs the original source position information of inlined AST nodes.
Previously the compiler plastered over the line numbers of inlined AST
nodes with the line number of the call. This meant that the PC-line
table mapped each PC to line number of the outermost call in its inlined
call stack, with no way to access the innermost line number.
Now the compiler retains line numbers of inlined AST nodes and writes
the innermost source position information to the PC-line and PC-file
tables. Some tools and tests expect to see outermost line numbers, so we
provide the OutermostLine function for displaying line info.
To keep track of the inlined call stack for an AST node, we extend the
src.PosBase type with an index into a global inlining tree. Every time
the compiler inlines a call, it creates a node in the global inlining
tree for the call, and writes its index to the PosBase of every inlined
AST node. The parent of this node is the inlining tree index of the
call. -1 signifies no parent.
For each function, the compiler creates a local inlining tree and a
PC-value table mapping each PC to an index in the local tree. These are
written to an object file, which is read by the linker. The linker
re-encodes these tables compactly by deduplicating function names and
file names.
This change increases the size of binaries by 4-5%. For example, this is
how the go1 benchmark binary is impacted by this change:
section old bytes new bytes delta
.text 3.49M ± 0% 3.49M ± 0% +0.06%
.rodata 1.12M ± 0% 1.21M ± 0% +8.21%
.gopclntab 1.50M ± 0% 1.68M ± 0% +11.89%
.debug_line 338k ± 0% 435k ± 0% +28.78%
Total 9.21M ± 0% 9.58M ± 0% +4.01%
Updates #19348.
Change-Id: Ic4f180c3b516018138236b0c35e0218270d957d3
Reviewed-on: https://go-review.googlesource.com/37231
Run-TryBot: David Lazar <lazard@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
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The default value of runtime.MemProfileRate
is non-zero, which means that a small portion
of allocations go through the (slow) profiled
allocation path.
This is never useful in the compiler
unless the -memprofile flag has been passed.
I noticed this when samples from mprof.go
showed up in a compiler cpu pprof listing.
name old time/op new time/op delta
Template 207ms ± 4% 205ms ± 4% -0.86% (p=0.001 n=97+90)
Unicode 91.8ms ± 4% 91.4ms ± 4% -0.44% (p=0.030 n=93+93)
GoTypes 628ms ± 4% 624ms ± 3% -0.73% (p=0.001 n=95+92)
Compiler 2.70s ± 3% 2.69s ± 3% -0.39% (p=0.000 n=97+95)
Flate 131ms ± 5% 130ms ± 4% -0.82% (p=0.000 n=93+90)
GoParser 154ms ± 5% 153ms ± 4% -0.57% (p=0.019 n=98+96)
Reflect 394ms ± 5% 392ms ± 5% -0.62% (p=0.026 n=94+97)
Tar 112ms ± 6% 112ms ± 5% ~ (p=0.455 n=97+98)
XML 214ms ± 3% 213ms ± 4% -0.68% (p=0.000 n=91+93)
name old user-ns/op new user-ns/op delta
Template 246user-ms ± 3% 244user-ms ± 4% -0.48% (p=0.016 n=92+91)
Unicode 114user-ms ± 5% 113user-ms ± 4% -0.78% (p=0.002 n=98+94)
GoTypes 817user-ms ± 3% 813user-ms ± 2% -0.50% (p=0.006 n=96+94)
Compiler 3.58user-s ± 2% 3.57user-s ± 2% -0.38% (p=0.003 n=97+95)
Flate 158user-ms ± 5% 157user-ms ± 4% -0.80% (p=0.000 n=94+90)
GoParser 191user-ms ± 4% 191user-ms ± 4% ~ (p=0.122 n=98+98)
Reflect 500user-ms ± 4% 498user-ms ± 4% ~ (p=0.057 n=95+99)
Tar 134user-ms ± 3% 134user-ms ± 4% ~ (p=0.529 n=98+98)
XML 265user-ms ± 3% 265user-ms ± 3% -0.30% (p=0.033 n=92+96)
Change-Id: Ied5384e337800d567895ff8d47f15d631edf4f0b
Reviewed-on: https://go-review.googlesource.com/35916
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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Change-Id: I7715581a04e513dcda9918e853fa6b1ddc703770
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pprof.WriteHeapProfile is shorthand for
pprof.Lookup("heap").WriteTo(f, 0).
The second parameter is debug.
If it is non-zero, pprof writes legacy-format
pprof output, which compilebench can parse.
Fixes #18641
Change-Id: Ica69adeb9809e9b5933aed943dcf4a07910e43fc
Reviewed-on: https://go-review.googlesource.com/35484
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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This replaces the src.Pos LineHist-based position tracking with
the syntax.Pos implementation and updates all uses.
The LineHist table is not used anymore - the respective code is still
there but should be removed eventually. CL forthcoming.
Passes toolstash -cmp when comparing to the master repo (with the
exception of a couple of swapped assembly instructions, likely due
to different instruction scheduling because the line-based sorting
has changed; though this is won't affect correctness).
The sizes of various important compiler data structures have increased
significantly (see the various sizes_test.go files); this is probably
the reason for an increase of compilation times (to be addressed). Here
are the results of compilebench -count 5, run on a "quiet" machine (no
apps running besides a terminal):
name old time/op new time/op delta
Template 256ms ± 1% 280ms ±15% +9.54% (p=0.008 n=5+5)
Unicode 132ms ± 1% 132ms ± 1% ~ (p=0.690 n=5+5)
GoTypes 891ms ± 1% 917ms ± 2% +2.88% (p=0.008 n=5+5)
Compiler 3.84s ± 2% 3.99s ± 2% +3.95% (p=0.016 n=5+5)
MakeBash 47.1s ± 1% 47.2s ± 2% ~ (p=0.841 n=5+5)
name old user-ns/op new user-ns/op delta
Template 309M ± 1% 326M ± 2% +5.18% (p=0.008 n=5+5)
Unicode 165M ± 1% 168M ± 4% ~ (p=0.421 n=5+5)
GoTypes 1.14G ± 2% 1.18G ± 1% +3.47% (p=0.008 n=5+5)
Compiler 5.00G ± 1% 5.16G ± 1% +3.12% (p=0.008 n=5+5)
Change-Id: I241c4246cdff627d7ecb95cac23060b38f9775ec
Reviewed-on: https://go-review.googlesource.com/34273
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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Various minor adjustments.
Change-Id: Iedfb97989f7bedaa3e9e8993b167e05f162434a7
Reviewed-on: https://go-review.googlesource.com/34136
Reviewed-by: David Lazar <lazard@golang.org>
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Adjust cmd/compile accordingly.
This will make it easier to replace the underlying implementation.
Change-Id: I33645850bb18c839b24785b6222a9e028617addb
Reviewed-on: https://go-review.googlesource.com/34133
Reviewed-by: David Lazar <lazard@golang.org>
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This change adds runtime/trace support to go tool compile.
Change-Id: I6c496b9b063796123f75eba6af511c53a57c0196
Reviewed-on: https://go-review.googlesource.com/25354
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
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After the removal of the old backend many types are no longer referenced
outside internal/gc. Make these functions private so that tools like
honnef.co/go/unused can spot when they become dead code. In doing so
this CL identified several previously public helpers which are no longer
used, so removes them.
This should be the last of the public functions.
Change-Id: I7e9c4e72f86f391b428b9dddb6f0d516529706c3
Reviewed-on: https://go-review.googlesource.com/29134
Run-TryBot: Dave Cheney <dave@cheney.net>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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util.go was originally added in golang.org/cl/4851, and later moved to
its current location in golang.org/cl/10287.
Change-Id: I10b4941d42ae1ff2e78990c497c1347bbbae4e3d
Reviewed-on: https://go-review.googlesource.com/19851
Reviewed-by: David Crawshaw <crawshaw@golang.org>
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Change-Id: I0ad7836c0e8d70ffdc458e125d97b01e85d8a608
Reviewed-on: https://go-review.googlesource.com/16130
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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Inlined the last occurrence of stringsCompare into exprcmp.
Passes go build -a -toolexec 'toolstash -cmp' std cmd.
Change-Id: I8fd99e3fbffc84283cc269368595cba950533066
Reviewed-on: https://go-review.googlesource.com/14872
Reviewed-by: Dave Cheney <dave@cheney.net>
Run-TryBot: Dave Cheney <dave@cheney.net>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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Moves the functions:
isSpace(int) bool
isAlpha(int) bool
isDigit(int) bool
isAlnum(int) bool
plan9quote(string) string
Passes go build -toolexec 'toolstash -cmp' -a std.
Change-Id: I6f946981abb6f29b047ad90d5c117847e826789f
Reviewed-on: https://go-review.googlesource.com/14952
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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Made use of range statement in for loops.
Cleaning along the way:
-remove unnecessary variable declarations
-rename variables
-remove dead code
This change passes go build -toolexec 'toolstash -cmp' -a std.
Change-Id: Ife8c2a98482a81ba91f5bbb65142d9f3dc46d6ee
Reviewed-on: https://go-review.googlesource.com/14379
Run-TryBot: Dave Cheney <dave@cheney.net>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dave Cheney <dave@cheney.net>
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Cleaning along the way:
-convert variable types from int to bool
-remove unnecessary functions
-remove unnecessary type conversion
-remove unnecessary variable declarations
-transform struct{string,string} with lookup to map[string]string
This change passes go build -toolexec 'toolstash -cmp' -a std.
Change-Id: I259728fe4afd7f23b67f08fab856ce0abee57b21
Reviewed-on: https://go-review.googlesource.com/14435
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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This helps vet see a real issue:
cmd/internal/gc$ go vet
gen.go:1223: unreachable code
Fixes #12106.
Change-Id: I720868b07ae6b6d5a4dc6b238baa8c9c889da6d8
Reviewed-on: https://go-review.googlesource.com/14083
Reviewed-by: Minux Ma <minux@golang.org>
Run-TryBot: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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Trivial merging of 5g, 6g, ... into go tool compile,
and similarlly 5l, 6l, ... into go tool link.
The files compile/main.go and link/main.go are new.
Everything else in those directories is a move followed by
change of imports and package name.
This CL breaks the build. Manual fixups are in the next CL.
See golang-dev thread titled "go tool compile, etc" for background.
Change-Id: Id35ff5a5859ad9037c61275d637b1bd51df6828b
Reviewed-on: https://go-review.googlesource.com/10287
Reviewed-by: Dave Cheney <dave@cheney.net>
Reviewed-by: Rob Pike <r@golang.org>
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