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/**************************************************************************
*
* Copyright 2009 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/**
* @file
* Stack backtracing.
*
* @author Jose Fonseca <jfonseca@vmware.com>
*/
#include "u_debug.h"
#include "u_debug_symbol.h"
#include "u_debug_stack.h"
#if defined(PIPE_OS_WINDOWS)
#include <windows.h>
#endif
/**
* Capture stack backtrace.
*
* NOTE: The implementation of this function is quite big, but it is important
* not to break it down in smaller functions to avoid adding new frames to the
* calling stack.
*/
void
debug_backtrace_capture(struct debug_stack_frame *backtrace,
unsigned start_frame,
unsigned nr_frames)
{
const void **frame_pointer = NULL;
unsigned i = 0;
if (!nr_frames) {
return;
}
/*
* On Windows try obtaining the stack backtrace via CaptureStackBackTrace.
*
* It works reliably both for x86 for x86_64.
*/
#if defined(PIPE_OS_WINDOWS)
{
typedef USHORT (WINAPI *PFNCAPTURESTACKBACKTRACE)(ULONG, ULONG,
PVOID *, PULONG);
static PFNCAPTURESTACKBACKTRACE pfnCaptureStackBackTrace = NULL;
if (!pfnCaptureStackBackTrace) {
static HMODULE hModule = NULL;
if (!hModule) {
hModule = LoadLibraryA("kernel32");
assert(hModule);
}
if (hModule) {
pfnCaptureStackBackTrace =
(PFNCAPTURESTACKBACKTRACE)GetProcAddress(hModule,
"RtlCaptureStackBackTrace");
}
}
if (pfnCaptureStackBackTrace) {
/*
* Skip this (debug_backtrace_capture) function's frame.
*/
start_frame += 1;
assert(start_frame + nr_frames < 63);
i = pfnCaptureStackBackTrace(start_frame, nr_frames,
(PVOID *) &backtrace->function, NULL);
/* Pad remaing requested frames with NULL */
while (i < nr_frames) {
backtrace[i++].function = NULL;
}
return;
}
}
#endif
#if defined(PIPE_CC_GCC)
frame_pointer = ((const void **)__builtin_frame_address(1));
#elif defined(PIPE_CC_MSVC) && defined(PIPE_ARCH_X86)
__asm {
mov frame_pointer, ebp
}
frame_pointer = (const void **)frame_pointer[0];
#else
frame_pointer = NULL;
#endif
#ifdef PIPE_ARCH_X86
while (nr_frames) {
const void **next_frame_pointer;
if (!frame_pointer)
break;
if (start_frame)
--start_frame;
else {
backtrace[i++].function = frame_pointer[1];
--nr_frames;
}
next_frame_pointer = (const void **)frame_pointer[0];
/* Limit the stack walk to avoid referencing undefined memory */
if ((uintptr_t)next_frame_pointer <= (uintptr_t)frame_pointer ||
(uintptr_t)next_frame_pointer > (uintptr_t)frame_pointer + 64*1024)
break;
frame_pointer = next_frame_pointer;
}
#else
(void) frame_pointer;
#endif
while (nr_frames) {
backtrace[i++].function = NULL;
--nr_frames;
}
}
void
debug_backtrace_dump(const struct debug_stack_frame *backtrace,
unsigned nr_frames)
{
unsigned i;
for (i = 0; i < nr_frames; ++i) {
if (!backtrace[i].function)
break;
debug_symbol_print(backtrace[i].function);
}
}
void
debug_backtrace_print(FILE *f,
const struct debug_stack_frame *backtrace,
unsigned nr_frames)
{
unsigned i;
for (i = 0; i < nr_frames; ++i) {
const char *symbol;
if (!backtrace[i].function)
break;
symbol = debug_symbol_name_cached(backtrace[i].function);
if (symbol)
fprintf(f, "%s\n", symbol);
}
}
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