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