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/* $Id$
*
* Helper to obtain the current stack trace. Should not be used in the actual
* compiler (only there for debugging).
*
* Copyright (C) 2008-2009 FAUmachine Team <info@faumachine.org>.
* This program is free software. You can redistribute it and/or modify it
* under the terms of the GNU General Public License, either version 2 of
* the License, or (at your option) any later version. See COPYING.
*/
#include "frontend/misc/StackTrace.hpp"
#include <iostream>
#include <cassert>
extern "C" {
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <dlfcn.h>
#include <stdio.h>
static void *
__attribute__((always_inline))
getStackElement(
void *frame_pointer,
const char **entry
)
{
void **fp = reinterpret_cast<void **>(frame_pointer);
void *return_address;
void *old_fp;
int ret;
Dl_info info;
old_fp = *fp;
fp++;
return_address = *fp;
ret = dladdr(return_address, &info);
if (ret == 0) {
return NULL;
}
*entry = info.dli_sname;
return old_fp;
}
#if defined(__i386__)
static void *
__attribute__((always_inline))
getFramePointer(void)
{
void *fp;
asm (
"mov %%ebp, %0;"
: "=r"(fp) /* output */
: /* no input */
: /* nothing clobbered */
);
return fp;
}
/* __i386__ */
#elif defined(__x86_64__)
static void *
__attribute__((always_inline))
getFramePointer(void)
{
void *fp;
asm (
"mov %%rbp, %0;"
: "=r"(fp) /* output */
: /* no input */
: /* nothing clobbered */
);
return fp;
}
#else /* ! __x86_64__ */
#error Not ported yet.
#endif
const char *
demangle(const char *sym)
{
static char cmd[4096];
unsigned int ret;
FILE *fp;
char *s;
ret = snprintf(cmd, sizeof(cmd), "/usr/bin/c++filt \"%s\"", sym);
assert(ret < sizeof(cmd));
fp = popen(cmd, "r");
if (fp == NULL) {
return sym;
}
s = fgets(cmd, sizeof(cmd), fp);
if (s == NULL) {
pclose(fp);
return sym;
}
pclose(fp);
return cmd;
}
}; /* extern "C" */
namespace ast {
std::map<std::string, std::string> StackTrace::mangleMap =
std::map<std::string, std::string>();
StackTrace *
StackTrace::getStackTrace(void)
{
void *fp;
const char *symbol;
StackTrace *strace;
std::string demangled_sym;
strace = new StackTrace();
fp = getFramePointer();
while (fp != NULL) {
fp = getStackElement(fp, &symbol);
if (fp != NULL) {
demangled_sym = resolveSym(std::string(symbol));
strace->stackTrace.push_back(demangled_sym);
}
}
return strace;
}
void
StackTrace::put(std::ostream &stream) const
{
stream << "Stack trace:" << std::endl;
for (std::list<std::string>::const_iterator i =
this->stackTrace.begin(); i != this->stackTrace.end(); i++) {
stream << "\t" << *i;
}
}
std::string
StackTrace::resolveSym(std::string sym)
{
std::map<std::string, std::string>::const_iterator i =
StackTrace::mangleMap.find(sym);
if (i != StackTrace::mangleMap.end()) {
return i->second;
}
// resolve + insert into mangle map.
const char *res;
res = demangle(sym.c_str());
if (res != NULL) {
mangleMap[sym] = std::string(res);
return std::string(res);
}
// resolution not possible
mangleMap[sym] = sym;
return sym;
}
std::ostream&
operator <<(std::ostream &stream, const StackTrace &st)
{
st.put(stream);
return stream;
}
}; /* namespace ast */
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