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c5eb20d0cc
We can now iterate the tree structure of the DIEs, access attribute values and parse some very basic DWARF expressions.
65 lines
2.4 KiB
C++
65 lines
2.4 KiB
C++
/*
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* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "Expression.h"
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#include <AK/BufferStream.h>
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#include <sys/arch/i386/regs.h>
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namespace Dwarf {
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namespace Expression {
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Value evaluate(const ByteBuffer& bytes, const PtraceRegisters& regs)
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{
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// TODO: we need a BufferStream variant that takes a const ByteBuffer
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BufferStream stream(const_cast<ByteBuffer&>(bytes));
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while (!stream.at_end()) {
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u8 opcode = 0;
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stream >> opcode;
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switch (static_cast<Operations>(opcode)) {
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case Operations::RegEbp: {
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int offset = 0;
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stream.read_LEB128_signed(offset);
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return Value { Type::UnsignedIntetger, regs.ebp + offset };
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}
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case Operations::FbReg: {
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int offset = 0;
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stream.read_LEB128_signed(offset);
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return Value { Type::UnsignedIntetger, regs.ebp + 2 * sizeof(size_t) + offset };
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}
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default:
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dbg() << "DWARF expr addr: " << (const void*)bytes.data();
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dbg() << "unsupported opcode: " << (u8)opcode;
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ASSERT_NOT_REACHED();
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}
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}
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ASSERT_NOT_REACHED();
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}
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};
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};
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