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LibDebug: Parse DWARF information entries

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We can now iterate the tree structure of the DIEs, access attribute
values and parse some very basic DWARF expressions.
This commit is contained in:
Itamar 2020-05-04 12:14:39 +03:00 • committed by Andreas Kling
parent 2cafc36d9c
commit c5eb20d0cc
14 changed files with 1067 additions and 3 deletions
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65
Libraries/LibDebug/Dwarf/Expression.cpp Normal file
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/*
* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "Expression.h"
#include <AK/BufferStream.h>
#include <sys/arch/i386/regs.h>
namespace Dwarf {
namespace Expression {
Value evaluate(const ByteBuffer& bytes, const PtraceRegisters& regs)
{
// TODO: we need a BufferStream variant that takes a const ByteBuffer
BufferStream stream(const_cast<ByteBuffer&>(bytes));
while (!stream.at_end()) {
u8 opcode = 0;
stream >> opcode;
switch (static_cast<Operations>(opcode)) {
case Operations::RegEbp: {
int offset = 0;
stream.read_LEB128_signed(offset);
return Value { Type::UnsignedIntetger, regs.ebp + offset };
}
case Operations::FbReg: {
int offset = 0;
stream.read_LEB128_signed(offset);
return Value { Type::UnsignedIntetger, regs.ebp + 2 * sizeof(size_t) + offset };
}
default:
dbg() << "DWARF expr addr: " << (const void*)bytes.data();
dbg() << "unsupported opcode: " << (u8)opcode;
ASSERT_NOT_REACHED();
}
}
ASSERT_NOT_REACHED();
}
};
};