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/**
* WinPR: Windows Portable Runtime
* WinPR Debugging helpers
*
* Copyright 2022 Armin Novak <armin.novak@thincast.com>
* Copyright 2022 Thincast Technologies GmbH
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <assert.h>
#include <stdlib.h>
#include <unwind.h>
#include <winpr/string.h>
#include "debug.h"
#include <dlfcn.h>
typedef struct
{
uintptr_t pc;
void* langSpecificData;
} unwind_info_t;
typedef struct
{
size_t pos;
size_t size;
unwind_info_t* info;
} unwind_context_t;
static _Unwind_Reason_Code unwind_backtrace_callback(struct _Unwind_Context* context, void* arg)
{
unwind_context_t* ctx = arg;
assert(ctx);
if (ctx->pos < ctx->size)
{
unwind_info_t* info = &ctx->info[ctx->pos++];
info->pc = _Unwind_GetIP(context);
info->langSpecificData = (void*)_Unwind_GetLanguageSpecificData(context);
}
return _URC_NO_REASON;
}
void* winpr_unwind_backtrace(DWORD size)
{
_Unwind_Reason_Code rc = _URC_FOREIGN_EXCEPTION_CAUGHT;
unwind_context_t* ctx = calloc(1, sizeof(unwind_context_t));
if (!ctx)
goto fail;
ctx->size = size;
ctx->info = calloc(size, sizeof(unwind_info_t));
if (!ctx->info)
goto fail;
rc = _Unwind_Backtrace(unwind_backtrace_callback, ctx);
if (rc != _URC_END_OF_STACK)
goto fail;
return ctx;
fail:
winpr_unwind_backtrace_free(ctx);
return NULL;
}
void winpr_unwind_backtrace_free(void* buffer)
{
unwind_context_t* ctx = buffer;
if (!ctx)
return;
free(ctx->info);
free(ctx);
}
#define UNWIND_MAX_LINE_SIZE 1024
char** winpr_unwind_backtrace_symbols(void* buffer, size_t* used)
{
union
{
char* cp;
char** cpp;
} cnv;
unwind_context_t* ctx = buffer;
cnv.cpp = NULL;
if (!ctx)
return NULL;
cnv.cpp = calloc(ctx->pos * (sizeof(char*) + UNWIND_MAX_LINE_SIZE), sizeof(char*));
if (!cnv.cpp)
return NULL;
if (used)
*used = ctx->pos;
for (size_t x = 0; x < ctx->pos; x++)
{
char* msg = cnv.cp + ctx->pos * sizeof(char*) + x * UNWIND_MAX_LINE_SIZE;
const unwind_info_t* info = &ctx->info[x];
Dl_info dlinfo = { 0 };
int rc = dladdr((void*)info->pc, &dlinfo);
cnv.cpp[x] = msg;
if (rc == 0)
_snprintf(msg, UNWIND_MAX_LINE_SIZE, "unresolvable, address=%p", (void*)info->pc);
else
_snprintf(msg, UNWIND_MAX_LINE_SIZE, "dli_fname=%s [%p], dli_sname=%s [%p]",
dlinfo.dli_fname, dlinfo.dli_fbase, dlinfo.dli_sname, dlinfo.dli_saddr);
}
return cnv.cpp;
}
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