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cgosymbolizer_darwin.c
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cgosymbolizer_darwin.c
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#include <dlfcn.h>
#include <libunwind.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "cgosymbolizer_darwin.h"
struct cgo_context {
bool used;
unw_context_t unw_ctx;
unw_cursor_t unw_cursor;
};
__thread struct cgo_context thread_ctx;
void cgo_traceback(void* p) {
struct {
uintptr_t ctx;
uintptr_t sig_ctx;
uintptr_t* buf;
uintptr_t max;
}* arg = p;
struct cgo_context ctx;
if (arg->ctx)
ctx = *(struct cgo_context*) arg->ctx;
else {
if (unw_getcontext(&ctx.unw_ctx) != 0)
return;
if (unw_init_local(&ctx.unw_cursor, &ctx.unw_ctx) != 0)
return;
// Skip the cgo_traceback, x_cgo_callers, and _sigtramp frames.
for (int i = 0; i < 3; i++)
if (unw_step(&ctx.unw_cursor) == 0)
return;
}
int i = 0;
while (i < arg->max) {
unw_word_t pc;
unw_get_reg(&ctx.unw_cursor, UNW_REG_IP, &pc);
if (pc == 0)
break;
arg->buf[i++] = pc;
if (unw_step(&ctx.unw_cursor) == 0)
break;
}
if (i < arg->max)
arg->buf[i] = 0;
}
void cgo_context(void* p) {
struct {
uintptr_t ctx;
}* arg = p;
if (arg->ctx != 0) {
struct cgo_context* ctx = (struct cgo_context*) arg->ctx;
ctx->used = 0;
return;
}
if (thread_ctx.used)
return;
if (unw_getcontext(&thread_ctx.unw_ctx) != 0)
return;
if (unw_init_local(&thread_ctx.unw_cursor, &thread_ctx.unw_ctx) != 0)
return;
// Step the saved state past this frame. It will cease to exist momentarily.
if (unw_step(&thread_ctx.unw_cursor) <= 0)
return;
arg->ctx = (uintptr_t) &thread_ctx;
}
void cgo_symbolizer(void* p) {
struct {
uintptr_t pc;
const char* file;
uintptr_t lineno;
const char* func;
uintptr_t entry;
uintptr_t more;
uintptr_t data;
}* arg = p;
Dl_info dlinfo;
if (dladdr((void *) arg->pc, &dlinfo) == 0) {
arg->file = "?";
arg->func = "?";
arg->entry = 0;
return;
}
arg->file = dlinfo.dli_fname;
arg->func = dlinfo.dli_sname;
arg->entry = (uintptr_t) dlinfo.dli_saddr;
}