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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cgotest
/*
#include <windows.h>
USHORT backtrace(ULONG FramesToCapture, PVOID *BackTrace) {
#ifdef _AMD64_
CONTEXT context;
RtlCaptureContext(&context);
ULONG64 ControlPc;
ControlPc = context.Rip;
int i;
for (i = 0; i < FramesToCapture; i++) {
PRUNTIME_FUNCTION FunctionEntry;
ULONG64 ImageBase;
VOID *HandlerData;
ULONG64 EstablisherFrame;
FunctionEntry = RtlLookupFunctionEntry(ControlPc, &ImageBase, NULL);
if (!FunctionEntry) {
// For simplicity, don't unwind leaf entries, which are not used in this test.
break;
} else {
RtlVirtualUnwind(0, ImageBase, ControlPc, FunctionEntry, &context, &HandlerData, &EstablisherFrame, NULL);
}
ControlPc = context.Rip;
// Check if we left the user range.
if (ControlPc < 0x10000) {
break;
}
BackTrace[i] = (PVOID)(ControlPc);
}
return i;
#else
return 0;
#endif
}
*/
import "C"
import (
"internal/testenv"
"reflect"
"runtime"
"strings"
"testing"
"unsafe"
)
// Test that the stack can be unwound through a call out and call back
// into Go.
func testCallbackCallersSEH(t *testing.T) {
testenv.SkipIfOptimizationOff(t) // This test requires inlining.
if runtime.Compiler != "gc" {
// The exact function names are not going to be the same.
t.Skip("skipping for non-gc toolchain")
}
if runtime.GOARCH != "amd64" {
// TODO: support SEH on other architectures.
t.Skip("skipping on non-amd64")
}
// Only frames in the test package are checked.
want := []string{
"test._Cfunc_backtrace",
"test.testCallbackCallersSEH.func1.1",
"test.testCallbackCallersSEH.func1",
"test.goCallback",
"test._Cfunc_callback",
"test.nestedCall.func1",
"test.nestedCall",
"test.testCallbackCallersSEH",
"test.TestCallbackCallersSEH",
}
pc := make([]uintptr, 100)
n := 0
nestedCall(func() {
n = int(C.backtrace(C.DWORD(len(pc)), (*C.PVOID)(unsafe.Pointer(&pc[0]))))
})
got := make([]string, 0, n)
for i := 0; i < n; i++ {
f := runtime.FuncForPC(pc[i] - 1)
if f == nil {
continue
}
fname := f.Name()
switch fname {
case "goCallback":
// TODO(qmuntal): investigate why this function doesn't appear
// when using the external linker.
continue
}
// In module mode, this package has a fully-qualified import path.
// Remove it if present.
fname = strings.TrimPrefix(fname, "cmd/cgo/internal/")
if !strings.HasPrefix(fname, "test.") {
continue
}
got = append(got, fname)
}
if !reflect.DeepEqual(want, got) {
t.Errorf("incorrect backtrace:\nwant:\t%v\ngot:\t%v", want, got)
}
}