forked from OSchip/llvm-project
39 lines
1.5 KiB
C
39 lines
1.5 KiB
C
|
//===-- stack_trace_compressor.h --------------------------------*- C++ -*-===//
|
||
|
|
//
|
||
|
|
// 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
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
#ifndef GWP_ASAN_STACK_TRACE_COMPRESSOR_
|
||
|
|
#define GWP_ASAN_STACK_TRACE_COMPRESSOR_
|
||
|
|
|
||
|
|
#include <stddef.h>
|
||
|
|
#include <stdint.h>
|
||
|
|
|
||
|
|
// These functions implement stack frame compression and decompression. We store
|
||
|
|
// the zig-zag encoded pointer difference between frame[i] and frame[i - 1] as
|
||
|
|
// a variable-length integer. This can reduce the memory overhead of stack
|
||
|
|
// traces by 50%.
|
||
|
|
|
||
|
|
namespace gwp_asan {
|
||
|
|
namespace compression {
|
||
|
|
|
||
|
|
// For the stack trace in `Unpacked` with length `UnpackedSize`, pack it into
|
||
|
|
// the buffer `Packed` maximum length `PackedMaxSize`. The return value is the
|
||
|
|
// number of bytes that were written to the output buffer.
|
||
|
|
size_t pack(const uintptr_t *Unpacked, size_t UnpackedSize, uint8_t *Packed,
|
||
|
|
size_t PackedMaxSize);
|
||
|
|
|
||
|
|
// From the packed stack trace in `Packed` of length `PackedSize`, write the
|
||
|
|
// unpacked stack trace of maximum length `UnpackedMaxSize` into `Unpacked`.
|
||
|
|
// Returns the number of full entries unpacked, or zero on error.
|
||
|
|
size_t unpack(const uint8_t *Packed, size_t PackedSize, uintptr_t *Unpacked,
|
||
|
|
size_t UnpackedMaxSize);
|
||
|
|
|
||
|
|
} // namespace compression
|
||
|
|
} // namespace gwp_asan
|
||
|
|
|
||
|
|
#endif // GWP_ASAN_STACK_TRACE_COMPRESSOR_
|