Viewing file:  tracebackctxt_c.c (2.37 KB) -rw-r--r--
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// Copyright 2016 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.
// The C definitions for tracebackctxt.go. That file uses //export so
// it can't put function definitions in the "C" import comment.
//go:build !gccgo
// +build !gccgo
#include <stdlib.h>
#include <stdint.h>
// Functions exported from Go.
extern void G1(void);
extern void G2(void);
extern void TracebackContextPreemptionGoFunction(int);
void C1() {
G1();
}
void C2() {
G2();
}
struct cgoContextArg {
uintptr_t context;
};
struct cgoTracebackArg {
uintptr_t context;
uintptr_t sigContext;
uintptr_t* buf;
uintptr_t max;
};
struct cgoSymbolizerArg {
uintptr_t pc;
const char* file;
uintptr_t lineno;
const char* func;
uintptr_t entry;
uintptr_t more;
uintptr_t data;
};
// Uses atomic adds and subtracts to catch the possibility of
// erroneous calls from multiple threads; that should be impossible in
// this test case, but we check just in case.
static int contextCount;
int getContextCount() {
return __sync_add_and_fetch(&contextCount, 0);
}
void tcContext(void* parg) {
struct cgoContextArg* arg = (struct cgoContextArg*)(parg);
if (arg->context == 0) {
arg->context = __sync_add_and_fetch(&contextCount, 1);
} else {
if (arg->context != __sync_add_and_fetch(&contextCount, 0)) {
abort();
}
__sync_sub_and_fetch(&contextCount, 1);
}
}
void tcContextSimple(void* parg) {
struct cgoContextArg* arg = (struct cgoContextArg*)(parg);
if (arg->context == 0) {
arg->context = 1;
}
}
void tcTraceback(void* parg) {
int base, i;
struct cgoTracebackArg* arg = (struct cgoTracebackArg*)(parg);
if (arg->context == 0 && arg->sigContext == 0) {
// This shouldn't happen in this program.
abort();
}
// Return a variable number of PC values.
base = arg->context << 8;
for (i = 0; i < arg->context; i++) {
if (i < arg->max) {
arg->buf[i] = base + i;
}
}
}
void tcSymbolizer(void *parg) {
struct cgoSymbolizerArg* arg = (struct cgoSymbolizerArg*)(parg);
if (arg->pc == 0) {
return;
}
// Report two lines per PC returned by traceback, to test more handling.
arg->more = arg->file == NULL;
arg->file = "tracebackctxt.go";
arg->func = "cFunction";
arg->lineno = arg->pc + (arg->more << 16);
}
void TracebackContextPreemptionCallGo(int i) {
TracebackContextPreemptionGoFunction(i);
}
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