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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "w32_stack.h"
#if defined(GIT_MSVC_CRTDBG)
#include "Windows.h"
#include "Dbghelp.h"
#include "win32/posix.h"
#include "hash.h"
/**
* This is supposedly defined in WinBase.h (from Windows.h) but there were linker issues.
*/
USHORT WINAPI RtlCaptureStackBackTrace(ULONG, ULONG, PVOID*, PULONG);
static bool g_win32_stack_initialized = false;
static HANDLE g_win32_stack_process = INVALID_HANDLE_VALUE;
static git_win32__stack__aux_cb_alloc g_aux_cb_alloc = NULL;
static git_win32__stack__aux_cb_lookup g_aux_cb_lookup = NULL;
int git_win32__stack__set_aux_cb(
git_win32__stack__aux_cb_alloc cb_alloc,
git_win32__stack__aux_cb_lookup cb_lookup)
{
g_aux_cb_alloc = cb_alloc;
g_aux_cb_lookup = cb_lookup;
return 0;
}
void git_win32__stack_init(void)
{
if (!g_win32_stack_initialized) {
g_win32_stack_process = GetCurrentProcess();
SymSetOptions(SYMOPT_LOAD_LINES);
SymInitialize(g_win32_stack_process, NULL, TRUE);
g_win32_stack_initialized = true;
}
}
void git_win32__stack_cleanup(void)
{
if (g_win32_stack_initialized) {
SymCleanup(g_win32_stack_process);
g_win32_stack_process = INVALID_HANDLE_VALUE;
g_win32_stack_initialized = false;
}
}
int git_win32__stack_capture(git_win32__stack__raw_data *pdata, int skip)
{
if (!g_win32_stack_initialized) {
giterr_set(GITERR_INVALID, "git_win32_stack not initialized.");
return GIT_ERROR;
}
memset(pdata, 0, sizeof(*pdata));
pdata->nr_frames = RtlCaptureStackBackTrace(
skip+1, GIT_WIN32__STACK__MAX_FRAMES, pdata->frames, NULL);
/* If an "aux" data provider was registered, ask it to capture
* whatever data it needs and give us an "aux_id" to it so that
* we can refer to it later when reporting.
*/
if (g_aux_cb_alloc)
(g_aux_cb_alloc)(&pdata->aux_id);
return 0;
}
int git_win32__stack_compare(
git_win32__stack__raw_data *d1,
git_win32__stack__raw_data *d2)
{
return memcmp(d1, d2, sizeof(*d1));
}
int git_win32__stack_format(
char *pbuf, int buf_len,
const git_win32__stack__raw_data *pdata,
const char *prefix, const char *suffix)
{
#define MY_MAX_FILENAME 255
/* SYMBOL_INFO has char FileName[1] at the end. The docs say to
* to malloc it with extra space for your desired max filename.
*/
struct {
SYMBOL_INFO symbol;
char extra[MY_MAX_FILENAME + 1];
} s;
IMAGEHLP_LINE64 line;
int buf_used = 0;
unsigned int k;
char detail[MY_MAX_FILENAME * 2]; /* filename plus space for function name and formatting */
int detail_len;
if (!g_win32_stack_initialized) {
giterr_set(GITERR_INVALID, "git_win32_stack not initialized.");
return GIT_ERROR;
}
if (!prefix)
prefix = "\t";
if (!suffix)
suffix = "\n";
memset(pbuf, 0, buf_len);
memset(&s, 0, sizeof(s));
s.symbol.MaxNameLen = MY_MAX_FILENAME;
s.symbol.SizeOfStruct = sizeof(SYMBOL_INFO);
memset(&line, 0, sizeof(line));
line.SizeOfStruct = sizeof(IMAGEHLP_LINE64);
for (k=0; k < pdata->nr_frames; k++) {
DWORD64 frame_k = (DWORD64)pdata->frames[k];
DWORD dwUnused;
if (SymFromAddr(g_win32_stack_process, frame_k, 0, &s.symbol) &&
SymGetLineFromAddr64(g_win32_stack_process, frame_k, &dwUnused, &line)) {
const char *pslash;
const char *pfile;
pslash = strrchr(line.FileName, '\\');
pfile = ((pslash) ? (pslash+1) : line.FileName);
p_snprintf(detail, sizeof(detail), "%s%s:%d> %s%s",
prefix, pfile, line.LineNumber, s.symbol.Name, suffix);
} else {
/* This happens when we cross into another module.
* For example, in CLAR tests, this is typically
* the CRT startup code. Just print an unknown
* frame and continue.
*/
p_snprintf(detail, sizeof(detail), "%s??%s", prefix, suffix);
}
detail_len = strlen(detail);
if (buf_len < (buf_used + detail_len + 1)) {
/* we don't have room for this frame in the buffer, so just stop. */
break;
}
memcpy(&pbuf[buf_used], detail, detail_len);
buf_used += detail_len;
}
/* "aux_id" 0 is reserved to mean no aux data. This is needed to handle
* allocs that occur before the aux callbacks were registered.
*/
if (pdata->aux_id > 0) {
p_snprintf(detail, sizeof(detail), "%saux_id: %d%s",
prefix, pdata->aux_id, suffix);
detail_len = strlen(detail);
if ((buf_used + detail_len + 1) < buf_len) {
memcpy(&pbuf[buf_used], detail, detail_len);
buf_used += detail_len;
}
/* If an "aux" data provider is still registered, ask it to append its detailed
* data to the end of ours using the "aux_id" it gave us when this de-duped
* item was created.
*/
if (g_aux_cb_lookup)
(g_aux_cb_lookup)(pdata->aux_id, &pbuf[buf_used], (buf_len - buf_used - 1));
}
return GIT_OK;
}
int git_win32__stack(
char * pbuf, int buf_len,
int skip,
const char *prefix, const char *suffix)
{
git_win32__stack__raw_data data;
int error;
if ((error = git_win32__stack_capture(&data, skip)) < 0)
return error;
if ((error = git_win32__stack_format(pbuf, buf_len, &data, prefix, suffix)) < 0)
return error;
return 0;
}
#endif
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