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cmd/compile: make sure instrumented call has type width

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The width of the type of an external variable defined with a type
literal may not be set when the instrumentation pass is run.  There are
two cases in the standard library that fail without the call to dowidth:

../../../src/encoding/base32/base32.go:322: constant -1000000000 overflows uintptr
../../../src/encoding/base32/base32.go:329: constant -1000000000 overflows uintptr
../../../src/encoding/json/encode.go:385: constant -1000000000 overflows uintptr
../../../src/encoding/json/encode.go:387: constant -1000000000 overflows uintptr

Change-Id: I7c3334f7decdb7488595ffe4090cd262d7334283
Reviewed-on: https://go-review.googlesource.com/16331
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Ian Lance Taylor 2015-10-26 13:58:23 -07:00
parent 6326786ce7
commit 9179c9cb5c
2 changed files with 19 additions and 2 deletions
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5
misc/cgo/testsanitizers/test.bash
View File

@ -37,6 +37,11 @@ fi
status=0 status=0
if ! go build -msan std; then
echo "FAIL: build -msan std"
status=1
fi
if ! go run -msan msan.go; then if ! go run -msan msan.go; then
echo "FAIL: msan" echo "FAIL: msan"
status=1 status=1

16
src/cmd/compile/internal/gc/racewalk.go
View File

@ -502,13 +502,25 @@ func callinstr(np **Node, init **NodeList, wr int, skip int) bool {
if wr != 0 { if wr != 0 {
name = "msanwrite" name = "msanwrite"
} }
f = mkcall(name, nil, init, uintptraddr(n), Nodintconst(t.Width)) // dowidth may not have been called for PEXTERN.
dowidth(t)
w := t.Width
if w == BADWIDTH {
Fatalf("instrument: %v badwidth", t)
}
f = mkcall(name, nil, init, uintptraddr(n), Nodintconst(w))
} else if flag_race != 0 && (t.Etype == TSTRUCT || Isfixedarray(t)) { } else if flag_race != 0 && (t.Etype == TSTRUCT || Isfixedarray(t)) {
name := "racereadrange" name := "racereadrange"
if wr != 0 { if wr != 0 {
name = "racewriterange" name = "racewriterange"
} }
f = mkcall(name, nil, init, uintptraddr(n), Nodintconst(t.Width)) // dowidth may not have been called for PEXTERN.
dowidth(t)
w := t.Width
if w == BADWIDTH {
Fatalf("instrument: %v badwidth", t)
}
f = mkcall(name, nil, init, uintptraddr(n), Nodintconst(w))
} else if flag_race != 0 { } else if flag_race != 0 {
name := "raceread" name := "raceread"
if wr != 0 { if wr != 0 {