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cmd/cgo: fix unaligned arguments typedmemmove crash on iOS

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Irregularly typedmemmove and bulkBarrierPreWrite crashes on
unaligned arguments. By aligning the arguments on 8 bytes this
is fixed.

Fixes #46893
This commit is contained in:
Tim Cooijmans 2022-05-25 09:22:12 +02:00
parent 7791e934c8
commit f0cb9ff35c
1 changed files with 1 additions and 1 deletions
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2
src/cmd/cgo/out.go
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@ -1003,7 +1003,7 @@ func (p *Package) writeExports(fgo2, fm, fgcc, fgcch io.Writer) {
// string.h for memset, and is also robust to C++
// types with constructors. Both GCC and LLVM optimize
// this into just zeroing _cgo_a.
fmt.Fprintf(fgcc, "\ttypedef %s %v _cgo_argtype;\n", ctype, p.packedAttribute())
fmt.Fprintf(fgcc, "\ttypedef %s %v __attribute__((aligned(8))) _cgo_argtype;\n", ctype, p.packedAttribute())
fmt.Fprintf(fgcc, "\tstatic _cgo_argtype _cgo_zero;\n")
fmt.Fprintf(fgcc, "\t_cgo_argtype _cgo_a = _cgo_zero;\n")
if gccResult != "void" && (len(fntype.Results.List) > 1 || len(fntype.Results.List[0].Names) > 1) {