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cmd/compile: use getcallerpc for racefuncentry

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Currently, when instrumenting for the race detector, the compiler
inserts racefuncentry/racefuncentryfp at the entry of instrumented
functions. racefuncentry takes the caller's PC. On AMD64, we synthesize
a node which points to -8(FP) which is where the return address is
stored. Later this node turns to a special Arg in SSA that is not
really an argument. This causes problems in the new ABI work so that
special node has to be special-cased.

This CL changes the special node to a call to getcallerpc, which lowers
to an intrinsic in SSA. This also unifies AMD64 code path and LR machine
code path, as getcallerpc works on all platforms.

Change-Id: I1377e140b91e0473cfcadfda221f26870c1b124d
Reviewed-on: https://go-review.googlesource.com/c/go/+/297929
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Cherry Zhang 2021-03-01 19:23:42 -05:00
parent a829114b21
commit a22bd3dc73
6 changed files with 44 additions and 55 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/cmd/compile/internal/base/base.go
View File

@ -70,6 +70,6 @@ var NoInstrumentPkgs = []string{
"internal/cpu",
}
// Don't insert racefuncenterfp/racefuncexit into the following packages.
// Don't insert racefuncenter/racefuncexit into the following packages.
// Memory accesses in the packages are either uninteresting or will cause false positives.
var NoRacePkgs = []string{"sync", "sync/atomic"}

6
src/cmd/compile/internal/ssa/rewrite.go
View File

@ -1612,18 +1612,18 @@ func needRaceCleanup(sym *AuxCall, v *Value) bool {
if !f.Config.Race {
return false
}
if !isSameCall(sym, "runtime.racefuncenter") && !isSameCall(sym, "runtime.racefuncenterfp") && !isSameCall(sym, "runtime.racefuncexit") {
if !isSameCall(sym, "runtime.racefuncenter") && !isSameCall(sym, "runtime.racefuncexit") {
return false
}
for _, b := range f.Blocks {
for _, v := range b.Values {
switch v.Op {
case OpStaticCall, OpStaticLECall:
// Check for racefuncenter/racefuncenterfp will encounter racefuncexit and vice versa.
// Check for racefuncenter will encounter racefuncexit and vice versa.
// Allow calls to panic*
s := v.Aux.(*AuxCall).Fn.String()
switch s {
case "runtime.racefuncenter", "runtime.racefuncenterfp", "runtime.racefuncexit",
case "runtime.racefuncenter", "runtime.racefuncexit",
"runtime.panicdivide", "runtime.panicwrap",
"runtime.panicshift":
continue

3
src/cmd/compile/internal/ssagen/ssa.go
View File

@ -4564,6 +4564,9 @@ func findIntrinsic(sym *types.Sym) intrinsicBuilder {
if sym.Pkg == types.LocalPkg {
pkg = base.Ctxt.Pkgpath
}
if sym.Pkg == ir.Pkgs.Runtime {
pkg = "runtime"
}
if base.Flag.Race && pkg == "sync/atomic" {
// The race detector needs to be able to intercept these calls.
// We can't intrinsify them.

57
src/cmd/compile/internal/typecheck/builtin.go
View File

@ -177,26 +177,26 @@ var runtimeDecls = [...]struct {
{"uint64tofloat64", funcTag, 116},
{"uint32tofloat64", funcTag, 117},
{"complex128div", funcTag, 118},
{"getcallerpc", funcTag, 119},
{"racefuncenter", funcTag, 31},
{"racefuncenterfp", funcTag, 9},
{"racefuncexit", funcTag, 9},
{"raceread", funcTag, 31},
{"racewrite", funcTag, 31},
{"racereadrange", funcTag, 119},
{"racewriterange", funcTag, 119},
{"msanread", funcTag, 119},
{"msanwrite", funcTag, 119},
{"msanmove", funcTag, 120},
{"checkptrAlignment", funcTag, 121},
{"checkptrArithmetic", funcTag, 123},
{"libfuzzerTraceCmp1", funcTag, 125},
{"libfuzzerTraceCmp2", funcTag, 127},
{"libfuzzerTraceCmp4", funcTag, 128},
{"libfuzzerTraceCmp8", funcTag, 129},
{"libfuzzerTraceConstCmp1", funcTag, 125},
{"libfuzzerTraceConstCmp2", funcTag, 127},
{"libfuzzerTraceConstCmp4", funcTag, 128},
{"libfuzzerTraceConstCmp8", funcTag, 129},
{"racereadrange", funcTag, 120},
{"racewriterange", funcTag, 120},
{"msanread", funcTag, 120},
{"msanwrite", funcTag, 120},
{"msanmove", funcTag, 121},
{"checkptrAlignment", funcTag, 122},
{"checkptrArithmetic", funcTag, 124},
{"libfuzzerTraceCmp1", funcTag, 126},
{"libfuzzerTraceCmp2", funcTag, 128},
{"libfuzzerTraceCmp4", funcTag, 129},
{"libfuzzerTraceCmp8", funcTag, 130},
{"libfuzzerTraceConstCmp1", funcTag, 126},
{"libfuzzerTraceConstCmp2", funcTag, 128},
{"libfuzzerTraceConstCmp4", funcTag, 129},
{"libfuzzerTraceConstCmp8", funcTag, 130},
{"x86HasPOPCNT", varTag, 6},
{"x86HasSSE41", varTag, 6},
{"x86HasFMA", varTag, 6},
@ -219,7 +219,7 @@ func params(tlist ...*types.Type) []*types.Field {
}
func runtimeTypes() []*types.Type {
var typs [130]*types.Type
var typs [131]*types.Type
typs[0] = types.ByteType
typs[1] = types.NewPtr(typs[0])
typs[2] = types.Types[types.TANY]
@ -339,16 +339,17 @@ func runtimeTypes() []*types.Type {
typs[116] = newSig(params(typs[24]), params(typs[20]))
typs[117] = newSig(params(typs[65]), params(typs[20]))
typs[118] = newSig(params(typs[26], typs[26]), params(typs[26]))
typs[119] = newSig(params(typs[5], typs[5]), nil)
typs[120] = newSig(params(typs[5], typs[5], typs[5]), nil)
typs[121] = newSig(params(typs[7], typs[1], typs[5]), nil)
typs[122] = types.NewSlice(typs[7])
typs[123] = newSig(params(typs[7], typs[122]), nil)
typs[124] = types.Types[types.TUINT8]
typs[125] = newSig(params(typs[124], typs[124]), nil)
typs[126] = types.Types[types.TUINT16]
typs[127] = newSig(params(typs[126], typs[126]), nil)
typs[128] = newSig(params(typs[65], typs[65]), nil)
typs[129] = newSig(params(typs[24], typs[24]), nil)
typs[119] = newSig(nil, params(typs[5]))
typs[120] = newSig(params(typs[5], typs[5]), nil)
typs[121] = newSig(params(typs[5], typs[5], typs[5]), nil)
typs[122] = newSig(params(typs[7], typs[1], typs[5]), nil)
typs[123] = types.NewSlice(typs[7])
typs[124] = newSig(params(typs[7], typs[123]), nil)
typs[125] = types.Types[types.TUINT8]
typs[126] = newSig(params(typs[125], typs[125]), nil)
typs[127] = types.Types[types.TUINT16]
typs[128] = newSig(params(typs[127], typs[127]), nil)
typs[129] = newSig(params(typs[65], typs[65]), nil)
typs[130] = newSig(params(typs[24], typs[24]), nil)
return typs[:]
}

4
src/cmd/compile/internal/typecheck/builtin/runtime.go
View File

@ -6,6 +6,7 @@
// to update builtin.go. This is not done automatically
// to avoid depending on having a working compiler binary.
//go:build ignore
// +build ignore
package runtime
@ -224,9 +225,10 @@ func uint32tofloat64(uint32) float64
func complex128div(num complex128, den complex128) (quo complex128)
func getcallerpc() uintptr
// race detection
func racefuncenter(uintptr)
func racefuncenterfp()
func racefuncexit()
func raceread(uintptr)
func racewrite(uintptr)

27
src/cmd/compile/internal/walk/race.go
View File

@ -7,11 +7,8 @@ package walk
import (
"cmd/compile/internal/base"
"cmd/compile/internal/ir"
"cmd/compile/internal/ssagen"
"cmd/compile/internal/typecheck"
"cmd/compile/internal/types"
"cmd/internal/src"
"cmd/internal/sys"
)
func instrument(fn *ir.Func) {
@ -26,26 +23,12 @@ func instrument(fn *ir.Func) {
if base.Flag.Race {
lno := base.Pos
base.Pos = src.NoXPos
if ssagen.Arch.LinkArch.Arch.Family != sys.AMD64 {
fn.Enter.Prepend(mkcallstmt("racefuncenterfp"))
fn.Exit.Append(mkcallstmt("racefuncexit"))
} else {
// nodpc is the PC of the caller as extracted by
// getcallerpc. We use -widthptr(FP) for x86.
// This only works for amd64. This will not
// work on arm or others that might support
// race in the future.
nodpc := ir.NewNameAt(src.NoXPos, typecheck.Lookup(".fp"))
nodpc.Class = ir.PPARAM
nodpc.SetUsed(true)
nodpc.SetType(types.Types[types.TUINTPTR])
nodpc.SetFrameOffset(int64(-types.PtrSize))
fn.Dcl = append(fn.Dcl, nodpc)
fn.Enter.Prepend(mkcallstmt("racefuncenter", nodpc))
fn.Exit.Append(mkcallstmt("racefuncexit"))
var init ir.Nodes
fn.Enter.Prepend(mkcallstmt("racefuncenter", mkcall("getcallerpc", types.Types[types.TUINTPTR], &init)))
if len(init) != 0 {
base.Fatalf("race walk: unexpected init for getcallerpc")
}
fn.Exit.Append(mkcallstmt("racefuncexit"))
base.Pos = lno
}
}