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cmd/cgo: gccgo support for cgoCheckPointer

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This uses weak declarations so that it will work with current versions
of gccgo that do not support pointer checking.

Change-Id: Ia34507e3231ac60517cb6834f0b673764715a256
Reviewed-on: https://go-review.googlesource.com/17429
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 2015-12-04 12:56:04 -08:00
parent 2ae895c0ce
commit fcbf04f9b9
1 changed files with 42 additions and 1 deletions
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43
src/cmd/cgo/out.go
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@ -103,6 +103,7 @@ func (p *Package) writeDefs() {
}
if *gccgo {
fmt.Fprint(fgo2, gccgoGoProlog)
fmt.Fprint(fc, p.cPrologGccgo())
} else {
fmt.Fprint(fgo2, goProlog)
@ -1288,6 +1289,12 @@ func _cgoCheckPointer(interface{}, ...interface{}) interface{}
func _cgoCheckResult(interface{})
`
const gccgoGoProlog = `
func _cgoCheckPointer(interface{}, ...interface{}) interface{}
func _cgoCheckResult(interface{})
`
const goStringDef = `
//go:linkname _cgo_runtime_gostring runtime.gostring
func _cgo_runtime_gostring(*_Ctype_char) string
@ -1340,7 +1347,8 @@ var builtinDefs = map[string]string{
}
func (p *Package) cPrologGccgo() string {
return strings.Replace(cPrologGccgo, "PREFIX", cPrefix, -1)
return strings.Replace(strings.Replace(cPrologGccgo, "PREFIX", cPrefix, -1),
"GCCGOSYMBOLPREF", p.gccgoSymbolPrefix(), -1)
}
const cPrologGccgo = `
@ -1395,6 +1403,39 @@ void *_cgoPREFIX_Cfunc__CMalloc(size_t n) {
runtime_throw("runtime: C malloc failed");
return p;
}
struct __go_type_descriptor;
typedef struct __go_empty_interface {
const struct __go_type_descriptor *__type_descriptor;
void *__object;
} Eface;
extern Eface runtimeCgoCheckPointer(Eface, Slice)
__asm__("runtime.cgoCheckPointer")
__attribute__((weak));
extern Eface localCgoCheckPointer(Eface, Slice)
__asm__("GCCGOSYMBOLPREF._cgoCheckPointer");
Eface localCgoCheckPointer(Eface ptr, Slice args) {
if(runtimeCgoCheckPointer) {
return runtimeCgoCheckPointer(ptr, args);
}
return ptr;
}
extern void runtimeCgoCheckResult(Eface)
__asm__("runtime.cgoCheckResult")
__attribute__((weak));
extern void localCgoCheckResult(Eface)
__asm__("GCCGOSYMBOLPREF._cgoCheckResult");
void localCgoCheckResult(Eface val) {
if(runtimeCgoCheckResult) {
runtimeCgoCheckResult(val);
}
}
`
func (p *Package) gccExportHeaderProlog() string {