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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* 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.
*/
/**
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <LongBow/longBow_Backtrace.h>
#include <LongBow/private/longBow_Memory.h>
#if defined(_WIN64)
# define backtrace(...) (0)
# define backtrace_symbols(...) 0
# define backtrace_symbols_fd(...) ((void) 0)
#elif defined(_WIN32)
# define backtrace(...) (0)
# define backtrace_symbols(...) 0
# define backtrace_symbols_fd(...) ((void) 0)
#elif defined(__ANDROID__)
# define backtrace(...) (0)
# define backtrace_symbols(...) 0
# define backtrace_symbols_fd(...) ((void) 0)
#elif defined(__APPLE__)
# include <execinfo.h>
#elif defined(__linux)
# include <execinfo.h>
#elif defined(__unix) // all unices not caught above
# define backtrace(...) (0)
# define backtrace_symbols(...) 0
# define backtrace_symbols_fd(...) ((void) 0)
#elif defined(__posix)
# include <execinfo.h>
#endif
struct longbow_backtrace {
void *callstack;
unsigned int frames;
unsigned int offset;
};
LongBowBacktrace *
longBowBacktrace_Create(uint32_t maximumFrames, uint32_t offset)
{
LongBowBacktrace *result = longBowMemory_Allocate(sizeof(LongBowBacktrace));
if (maximumFrames > 0) {
void **stackTrace = longBowMemory_Allocate(sizeof(stackTrace[0]) * ((size_t) maximumFrames + offset));
unsigned int frames = (unsigned int) backtrace(stackTrace, (int) (maximumFrames + offset));
if (frames > offset) {
unsigned int actualFrames = frames - offset;
if (actualFrames > maximumFrames) {
actualFrames = maximumFrames;
}
// Shift out the first 'offset' number of frames in the stack trace.
memmove(&stackTrace[0], &stackTrace[offset], actualFrames * sizeof(stackTrace[0]));
result->callstack = stackTrace;
result->frames = actualFrames;
result->offset = 0;
}
}
return result;
}
unsigned int
longBowBacktrace_GetFrameCount(const LongBowBacktrace *backtrace)
{
return backtrace->frames;
}
void
longBowBacktrace_Destroy(LongBowBacktrace **backtracePtr)
{
LongBowBacktrace *backtrace = *backtracePtr;
longBowMemory_Deallocate(&backtrace->callstack);
longBowMemory_Deallocate((void **) backtracePtr);
}
char **
longBowBacktrace_Symbols(const LongBowBacktrace *backtrace)
{
char **result = NULL;
if (backtrace != NULL) {
result = backtrace_symbols(backtrace->callstack, (int) backtrace->frames);
}
return result;
}
char *
longBowBacktrace_ToString(const LongBowBacktrace *backtrace)
{
char *result = NULL;
char **lines = longBowBacktrace_Symbols(backtrace);
if (lines == NULL) {
result = longBowMemory_StringCopy("(backtrace symbols not supported)");
} else {
size_t sum = 0;
for (int i = 0; i < backtrace->frames; i++) {
sum += strlen(lines[i]) + 1;
}
result = longBowMemory_Allocate(sum + 1 * sizeof(char));
char *offset = result;
for (int i = 0; i < backtrace->frames; i++) {
strcpy(offset, lines[i]);
offset += strlen(lines[i]);
*offset++ = '\n';
}
*offset = 0;
}
return result;
}
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