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//===-- sanitizer_stacktrace_libcdep.cpp ----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is shared between AddressSanitizer and ThreadSanitizer
// run-time libraries.
//===----------------------------------------------------------------------===//
#include "sanitizer_common.h"
#include "sanitizer_placement_new.h"
#include "sanitizer_stacktrace.h"
#include "sanitizer_stacktrace_printer.h"
#include "sanitizer_symbolizer.h"
namespace __sanitizer {
void StackTrace::Print() const {
if (trace == nullptr || size == 0) {
Printf(" <empty stack>\n\n");
return;
}
InternalScopedString frame_desc(GetPageSizeCached() * 2);
InternalScopedString dedup_token(GetPageSizeCached());
int dedup_frames = common_flags()->dedup_token_length;
uptr frame_num = 0;
for (uptr i = 0; i < size && trace[i]; i++) {
// PCs in stack traces are actually the return addresses, that is,
// addresses of the next instructions after the call.
uptr pc = GetPreviousInstructionPc(trace[i]);
SymbolizedStack *frames = Symbolizer::GetOrInit()->SymbolizePC(pc);
CHECK(frames);
for (SymbolizedStack *cur = frames; cur; cur = cur->next) {
frame_desc.clear();
RenderFrame(&frame_desc, common_flags()->stack_trace_format, frame_num++,
cur->info, common_flags()->symbolize_vs_style,
common_flags()->strip_path_prefix);
Printf("%s\n", frame_desc.data());
if (dedup_frames-- > 0) {
if (dedup_token.length())
dedup_token.append("--");
if (cur->info.function != nullptr)
dedup_token.append(cur->info.function);
}
}
frames->ClearAll();
}
// Always print a trailing empty line after stack trace.
Printf("\n");
if (dedup_token.length())
Printf("DEDUP_TOKEN: %s\n", dedup_token.data());
}
void BufferedStackTrace::Unwind(u32 max_depth, uptr pc, uptr bp, void *context,
uptr stack_top, uptr stack_bottom,
bool request_fast_unwind) {
// Ensures all call sites get what they requested.
CHECK_EQ(request_fast_unwind, WillUseFastUnwind(request_fast_unwind));
top_frame_bp = (max_depth > 0) ? bp : 0;
// Avoid doing any work for small max_depth.
if (max_depth == 0) {
size = 0;
return;
}
if (max_depth == 1) {
size = 1;
trace_buffer[0] = pc;
return;
}
if (!WillUseFastUnwind(request_fast_unwind)) {
#if SANITIZER_CAN_SLOW_UNWIND
if (context)
UnwindSlow(pc, context, max_depth);
else
UnwindSlow(pc, max_depth);
#else
UNREACHABLE("slow unwind requested but not available");
#endif
} else {
UnwindFast(pc, bp, stack_top, stack_bottom, max_depth);
}
}
static int GetModuleAndOffsetForPc(uptr pc, char *module_name,
uptr module_name_len, uptr *pc_offset) {
const char *found_module_name = nullptr;
bool ok = Symbolizer::GetOrInit()->GetModuleNameAndOffsetForPC(
pc, &found_module_name, pc_offset);
if (!ok) return false;
if (module_name && module_name_len) {
internal_strncpy(module_name, found_module_name, module_name_len);
module_name[module_name_len - 1] = '\x00';
}
return true;
}
} // namespace __sanitizer
using namespace __sanitizer;
extern "C" {
SANITIZER_INTERFACE_ATTRIBUTE
void __sanitizer_symbolize_pc(uptr pc, const char *fmt, char *out_buf,
uptr out_buf_size) {
if (!out_buf_size) return;
pc = StackTrace::GetPreviousInstructionPc(pc);
SymbolizedStack *frame = Symbolizer::GetOrInit()->SymbolizePC(pc);
if (!frame) {
internal_strncpy(out_buf, "<can't symbolize>", out_buf_size);
out_buf[out_buf_size - 1] = 0;
return;
}
InternalScopedString frame_desc(GetPageSizeCached());
uptr frame_num = 0;
// Reserve one byte for the final 0.
char *out_end = out_buf + out_buf_size - 1;
for (SymbolizedStack *cur = frame; cur && out_buf < out_end;
cur = cur->next) {
frame_desc.clear();
RenderFrame(&frame_desc, fmt, frame_num++, cur->info,
common_flags()->symbolize_vs_style,
common_flags()->strip_path_prefix);
if (!frame_desc.length())
continue;
// Reserve one byte for the terminating 0.
uptr n = out_end - out_buf - 1;
internal_strncpy(out_buf, frame_desc.data(), n);
out_buf += __sanitizer::Min<uptr>(n, frame_desc.length());
*out_buf++ = 0;
}
CHECK(out_buf <= out_end);
*out_buf = 0;
}
SANITIZER_INTERFACE_ATTRIBUTE
void __sanitizer_symbolize_global(uptr data_addr, const char *fmt,
char *out_buf, uptr out_buf_size) {
if (!out_buf_size) return;
out_buf[0] = 0;
DataInfo DI;
if (!Symbolizer::GetOrInit()->SymbolizeData(data_addr, &DI)) return;
InternalScopedString data_desc(GetPageSizeCached());
RenderData(&data_desc, fmt, &DI, common_flags()->strip_path_prefix);
internal_strncpy(out_buf, data_desc.data(), out_buf_size);
out_buf[out_buf_size - 1] = 0;
}
SANITIZER_INTERFACE_ATTRIBUTE
int __sanitizer_get_module_and_offset_for_pc(uptr pc, char *module_name,
uptr module_name_len,
uptr *pc_offset) {
return __sanitizer::GetModuleAndOffsetForPc(pc, module_name, module_name_len,
pc_offset);
}
} // extern "C"
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