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| //===- DWARFDebugAddr.cpp -------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/DWARF/DWARFDebugAddr.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/DebugInfo/DWARF/DWARFUnit.h"
using namespace llvm;
void DWARFDebugAddrTable::clear() {
HeaderData = {};
Addrs.clear();
invalidateLength();
}
Error DWARFDebugAddrTable::extract(DWARFDataExtractor Data,
uint64_t *OffsetPtr,
uint16_t Version,
uint8_t AddrSize,
std::function<void(Error)> WarnCallback) {
clear();
HeaderOffset = *OffsetPtr;
// Read and verify the length field.
if (!Data.isValidOffsetForDataOfSize(*OffsetPtr, sizeof(uint32_t)))
return createStringError(errc::invalid_argument,
"section is not large enough to contain a "
".debug_addr table length at offset 0x%"
PRIx64, *OffsetPtr);
uint16_t UnitVersion;
if (Version == 0) {
WarnCallback(createStringError(errc::invalid_argument,
"DWARF version is not defined in CU,"
" assuming version 5"));
UnitVersion = 5;
} else {
UnitVersion = Version;
}
// TODO: Add support for DWARF64.
Format = dwarf::DwarfFormat::DWARF32;
if (UnitVersion >= 5) {
HeaderData.Length = Data.getU32(OffsetPtr);
if (HeaderData.Length == dwarf::DW_LENGTH_DWARF64) {
invalidateLength();
return createStringError(errc::not_supported,
"DWARF64 is not supported in .debug_addr at offset 0x%" PRIx64,
HeaderOffset);
}
if (HeaderData.Length + sizeof(uint32_t) < sizeof(Header)) {
uint32_t TmpLength = getLength();
invalidateLength();
return createStringError(errc::invalid_argument,
".debug_addr table at offset 0x%" PRIx64
" has too small length (0x%" PRIx32
") to contain a complete header",
HeaderOffset, TmpLength);
}
uint64_t End = HeaderOffset + getLength();
if (!Data.isValidOffsetForDataOfSize(HeaderOffset, End - HeaderOffset)) {
uint32_t TmpLength = getLength();
invalidateLength();
return createStringError(errc::invalid_argument,
"section is not large enough to contain a .debug_addr table "
"of length 0x%" PRIx32 " at offset 0x%" PRIx64,
TmpLength, HeaderOffset);
}
HeaderData.Version = Data.getU16(OffsetPtr);
HeaderData.AddrSize = Data.getU8(OffsetPtr);
HeaderData.SegSize = Data.getU8(OffsetPtr);
DataSize = getDataSize();
} else {
HeaderData.Version = UnitVersion;
HeaderData.AddrSize = AddrSize;
// TODO: Support for non-zero SegSize.
HeaderData.SegSize = 0;
DataSize = Data.size();
}
// Perform basic validation of the remaining header fields.
// We support DWARF version 5 for now as well as pre-DWARF5
// implementations of .debug_addr table, which doesn't contain a header
// and consists only of a series of addresses.
if (HeaderData.Version > 5) {
return createStringError(errc::not_supported, "version %" PRIu16
" of .debug_addr section at offset 0x%" PRIx64 " is not supported",
HeaderData.Version, HeaderOffset);
}
// FIXME: For now we just treat version mismatch as an error,
// however the correct way to associate a .debug_addr table
// with a .debug_info table is to look at the DW_AT_addr_base
// attribute in the info table.
if (HeaderData.Version != UnitVersion)
return createStringError(errc::invalid_argument,
".debug_addr table at offset 0x%" PRIx64
" has version %" PRIu16
" which is different from the version suggested"
" by the DWARF unit header: %" PRIu16,
HeaderOffset, HeaderData.Version, UnitVersion);
if (HeaderData.AddrSize != 4 && HeaderData.AddrSize != 8)
return createStringError(errc::not_supported,
".debug_addr table at offset 0x%" PRIx64
" has unsupported address size %" PRIu8,
HeaderOffset, HeaderData.AddrSize);
if (HeaderData.AddrSize != AddrSize && AddrSize != 0)
return createStringError(errc::invalid_argument,
".debug_addr table at offset 0x%" PRIx64
" has address size %" PRIu8
" which is different from CU address size %" PRIu8,
HeaderOffset, HeaderData.AddrSize, AddrSize);
// TODO: add support for non-zero segment selector size.
if (HeaderData.SegSize != 0)
return createStringError(errc::not_supported,
".debug_addr table at offset 0x%" PRIx64
" has unsupported segment selector size %" PRIu8,
HeaderOffset, HeaderData.SegSize);
if (DataSize % HeaderData.AddrSize != 0) {
invalidateLength();
return createStringError(errc::invalid_argument,
".debug_addr table at offset 0x%" PRIx64
" contains data of size %" PRIu32
" which is not a multiple of addr size %" PRIu8,
HeaderOffset, DataSize, HeaderData.AddrSize);
}
Data.setAddressSize(HeaderData.AddrSize);
uint32_t AddrCount = DataSize / HeaderData.AddrSize;
for (uint32_t I = 0; I < AddrCount; ++I)
if (HeaderData.AddrSize == 4)
Addrs.push_back(Data.getU32(OffsetPtr));
else
Addrs.push_back(Data.getU64(OffsetPtr));
return Error::success();
}
void DWARFDebugAddrTable::dump(raw_ostream &OS, DIDumpOptions DumpOpts) const {
if (DumpOpts.Verbose)
OS << format("0x%8.8" PRIx32 ": ", HeaderOffset);
OS << format("Addr Section: length = 0x%8.8" PRIx32
", version = 0x%4.4" PRIx16 ", "
"addr_size = 0x%2.2" PRIx8 ", seg_size = 0x%2.2" PRIx8 "\n",
HeaderData.Length, HeaderData.Version, HeaderData.AddrSize,
HeaderData.SegSize);
if (Addrs.size() > 0) {
const char *AddrFmt = (HeaderData.AddrSize == 4) ? "0x%8.8" PRIx64 "\n"
: "0x%16.16" PRIx64 "\n";
OS << "Addrs: [\n";
for (uint64_t Addr : Addrs)
OS << format(AddrFmt, Addr);
OS << "]\n";
}
}
Expected<uint64_t> DWARFDebugAddrTable::getAddrEntry(uint32_t Index) const {
if (Index < Addrs.size())
return Addrs[Index];
return createStringError(errc::invalid_argument,
"Index %" PRIu32 " is out of range of the "
".debug_addr table at offset 0x%" PRIx64,
Index, HeaderOffset);
}
uint32_t DWARFDebugAddrTable::getLength() const {
if (HeaderData.Length == 0)
return 0;
// TODO: DWARF64 support.
return HeaderData.Length + sizeof(uint32_t);
}
uint32_t DWARFDebugAddrTable::getDataSize() const {
if (DataSize != 0)
return DataSize;
if (getLength() == 0)
return 0;
return getLength() - getHeaderSize();
}
|