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108 lines
4.2 KiB
C++
108 lines
4.2 KiB
C++
//===- DWARFDebugArangeSet.cpp --------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/DebugInfo/DWARF/DWARFDebugArangeSet.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cassert>
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#include <cinttypes>
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#include <cstdint>
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#include <cstring>
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using namespace llvm;
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void DWARFDebugArangeSet::clear() {
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Offset = -1U;
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std::memset(&HeaderData, 0, sizeof(Header));
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ArangeDescriptors.clear();
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}
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bool
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DWARFDebugArangeSet::extract(DataExtractor data, uint32_t *offset_ptr) {
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if (data.isValidOffset(*offset_ptr)) {
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ArangeDescriptors.clear();
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Offset = *offset_ptr;
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// 7.20 Address Range Table
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//
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// Each set of entries in the table of address ranges contained in
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// the .debug_aranges section begins with a header consisting of: a
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// 4-byte length containing the length of the set of entries for this
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// compilation unit, not including the length field itself; a 2-byte
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// version identifier containing the value 2 for DWARF Version 2; a
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// 4-byte offset into the.debug_infosection; a 1-byte unsigned integer
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// containing the size in bytes of an address (or the offset portion of
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// an address for segmented addressing) on the target system; and a
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// 1-byte unsigned integer containing the size in bytes of a segment
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// descriptor on the target system. This header is followed by a series
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// of tuples. Each tuple consists of an address and a length, each in
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// the size appropriate for an address on the target architecture.
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HeaderData.Length = data.getU32(offset_ptr);
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HeaderData.Version = data.getU16(offset_ptr);
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HeaderData.CuOffset = data.getU32(offset_ptr);
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HeaderData.AddrSize = data.getU8(offset_ptr);
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HeaderData.SegSize = data.getU8(offset_ptr);
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// Perform basic validation of the header fields.
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if (!data.isValidOffsetForDataOfSize(Offset, HeaderData.Length) ||
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(HeaderData.AddrSize != 4 && HeaderData.AddrSize != 8)) {
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clear();
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return false;
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}
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// The first tuple following the header in each set begins at an offset
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// that is a multiple of the size of a single tuple (that is, twice the
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// size of an address). The header is padded, if necessary, to the
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// appropriate boundary.
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const uint32_t header_size = *offset_ptr - Offset;
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const uint32_t tuple_size = HeaderData.AddrSize * 2;
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uint32_t first_tuple_offset = 0;
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while (first_tuple_offset < header_size)
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first_tuple_offset += tuple_size;
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*offset_ptr = Offset + first_tuple_offset;
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Descriptor arangeDescriptor;
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static_assert(sizeof(arangeDescriptor.Address) ==
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sizeof(arangeDescriptor.Length),
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"Different datatypes for addresses and sizes!");
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assert(sizeof(arangeDescriptor.Address) >= HeaderData.AddrSize);
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while (data.isValidOffset(*offset_ptr)) {
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arangeDescriptor.Address = data.getUnsigned(offset_ptr, HeaderData.AddrSize);
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arangeDescriptor.Length = data.getUnsigned(offset_ptr, HeaderData.AddrSize);
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// Each set of tuples is terminated by a 0 for the address and 0
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// for the length.
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if (arangeDescriptor.Address || arangeDescriptor.Length)
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ArangeDescriptors.push_back(arangeDescriptor);
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else
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break; // We are done if we get a zero address and length
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}
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return !ArangeDescriptors.empty();
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}
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return false;
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}
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void DWARFDebugArangeSet::dump(raw_ostream &OS) const {
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OS << format("Address Range Header: length = 0x%8.8x, version = 0x%4.4x, ",
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HeaderData.Length, HeaderData.Version)
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<< format("cu_offset = 0x%8.8x, addr_size = 0x%2.2x, seg_size = 0x%2.2x\n",
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HeaderData.CuOffset, HeaderData.AddrSize, HeaderData.SegSize);
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const uint32_t hex_width = HeaderData.AddrSize * 2;
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for (const auto &Desc : ArangeDescriptors) {
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OS << format("[0x%*.*" PRIx64 " -", hex_width, hex_width, Desc.Address)
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<< format(" 0x%*.*" PRIx64 ")\n",
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hex_width, hex_width, Desc.getEndAddress());
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}
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}
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