a09c4a6ff2
The linker was modified so that a shared library has a read-only map, then a read-execute map to represent the whole shared library. When backtraces are created, then the offsets are set incorrectly for backtraces. For example, all backtraces wind up with an offset now, and a shared library loaded out of an apk shows the wrong offset. Changes: - Fix the FormatFrame function which was putting the offset before the map name. - Refactor the Maps and MapInfo classes to keep track of the previous map instead of all maps. This was the only map that was ever needed. - Modify the unwind_for_offline tool to capture both the read-only and read-execute map when using the read-only segment option. Bug: 120981155 Test: Updated unit tests pass. Test: Unwinds on device don't show the offsets everywhere any more. Change-Id: I75b3727221be9c20316dfdcd7a1c6d242d7ce948
115 lines
3.3 KiB
C++
115 lines
3.3 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _LIBUNWINDSTACK_UNWINDER_H
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#define _LIBUNWINDSTACK_UNWINDER_H
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#include <stdint.h>
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#include <sys/types.h>
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#include <memory>
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#include <string>
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#include <vector>
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#include <unwindstack/Error.h>
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#include <unwindstack/Maps.h>
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#include <unwindstack/Memory.h>
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#include <unwindstack/Regs.h>
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namespace unwindstack {
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// Forward declarations.
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class DexFiles;
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class Elf;
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class JitDebug;
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enum ArchEnum : uint8_t;
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struct FrameData {
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size_t num;
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uint64_t rel_pc;
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uint64_t pc;
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uint64_t sp;
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std::string function_name;
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uint64_t function_offset = 0;
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std::string map_name;
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// The offset from the first map representing the frame. When there are
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// two maps (read-only and read-execute) this will be the offset from
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// the read-only map. When there is only one map, this will be the
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// same as the actual offset of the map and match map_exact_offset.
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uint64_t map_elf_start_offset = 0;
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// The actual offset from the map where the pc lies.
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uint64_t map_exact_offset = 0;
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uint64_t map_start = 0;
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uint64_t map_end = 0;
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uint64_t map_load_bias = 0;
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int map_flags = 0;
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};
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class Unwinder {
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public:
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Unwinder(size_t max_frames, Maps* maps, Regs* regs, std::shared_ptr<Memory> process_memory)
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: max_frames_(max_frames), maps_(maps), regs_(regs), process_memory_(process_memory) {
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frames_.reserve(max_frames);
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}
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~Unwinder() = default;
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void Unwind(const std::vector<std::string>* initial_map_names_to_skip = nullptr,
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const std::vector<std::string>* map_suffixes_to_ignore = nullptr);
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size_t NumFrames() { return frames_.size(); }
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const std::vector<FrameData>& frames() { return frames_; }
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std::string FormatFrame(size_t frame_num);
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static std::string FormatFrame(const FrameData& frame, bool is32bit);
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void SetJitDebug(JitDebug* jit_debug, ArchEnum arch);
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// Disabling the resolving of names results in the function name being
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// set to an empty string and the function offset being set to zero.
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void SetResolveNames(bool resolve) { resolve_names_ = resolve; }
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#if !defined(NO_LIBDEXFILE_SUPPORT)
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void SetDexFiles(DexFiles* dex_files, ArchEnum arch);
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#endif
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ErrorCode LastErrorCode() { return last_error_.code; }
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uint64_t LastErrorAddress() { return last_error_.address; }
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private:
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void FillInDexFrame();
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void FillInFrame(MapInfo* map_info, Elf* elf, uint64_t rel_pc, uint64_t func_pc,
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uint64_t pc_adjustment);
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size_t max_frames_;
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Maps* maps_;
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Regs* regs_;
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std::vector<FrameData> frames_;
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std::shared_ptr<Memory> process_memory_;
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JitDebug* jit_debug_ = nullptr;
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#if !defined(NO_LIBDEXFILE_SUPPORT)
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DexFiles* dex_files_ = nullptr;
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#endif
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bool resolve_names_ = true;
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ErrorData last_error_;
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};
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} // namespace unwindstack
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#endif // _LIBUNWINDSTACK_UNWINDER_H
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