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author | Gerrit Code Review <noreply-gerritcodereview@google.com> | 2021-08-12 20:22:27 +0000 |
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committer | Gerrit Code Review <noreply-gerritcodereview@google.com> | 2021-08-12 20:22:27 +0000 |
commit | 4d3cc84774549d26e52cbba3a0ffc50d3ede80d5 (patch) | |
tree | de3466e3b835e2c18fa03548ddf0619f5555575b /src/runtime/testdata/testprog/checkptr.go | |
parent | 7e9f911ec4fd08ce9b4296f0aea4864b53064573 (diff) | |
parent | a64ab8d3ecb38e10007e136edc9dc3abde873e1e (diff) | |
download | go-dev.typeparams.tar.gz go-dev.typeparams.zip |
Merge "[dev.typeparams] all: merge master (46fd547) into dev.typeparams" into dev.typeparamsdev.typeparams
Diffstat (limited to 'src/runtime/testdata/testprog/checkptr.go')
-rw-r--r-- | src/runtime/testdata/testprog/checkptr.go | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/src/runtime/testdata/testprog/checkptr.go b/src/runtime/testdata/testprog/checkptr.go index f76b64ad96..9c5561396e 100644 --- a/src/runtime/testdata/testprog/checkptr.go +++ b/src/runtime/testdata/testprog/checkptr.go @@ -4,11 +4,16 @@ package main -import "unsafe" +import ( + "runtime" + "time" + "unsafe" +) func init() { register("CheckPtrAlignmentNoPtr", CheckPtrAlignmentNoPtr) register("CheckPtrAlignmentPtr", CheckPtrAlignmentPtr) + register("CheckPtrAlignmentNilPtr", CheckPtrAlignmentNilPtr) register("CheckPtrArithmetic", CheckPtrArithmetic) register("CheckPtrArithmetic2", CheckPtrArithmetic2) register("CheckPtrSize", CheckPtrSize) @@ -29,6 +34,35 @@ func CheckPtrAlignmentPtr() { sink2 = (**int64)(unsafe.Pointer(uintptr(p) + 1)) } +// CheckPtrAlignmentNilPtr tests that checkptrAlignment doesn't crash +// on nil pointers (#47430). +func CheckPtrAlignmentNilPtr() { + var do func(int) + do = func(n int) { + // Inflate the stack so runtime.shrinkstack gets called during GC + if n > 0 { + do(n - 1) + } + + var p unsafe.Pointer + _ = (*int)(p) + } + + go func() { + for { + runtime.GC() + } + }() + + go func() { + for i := 0; ; i++ { + do(i % 1024) + } + }() + + time.Sleep(time.Second) +} + func CheckPtrArithmetic() { var x int i := uintptr(unsafe.Pointer(&x)) |