2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
248 lines
8.6 KiB
C++
248 lines
8.6 KiB
C++
//===- DWARFDebugRnglists.cpp ---------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/DebugInfo/DWARF/DWARFDebugRnglists.h"
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#include "llvm/BinaryFormat/Dwarf.h"
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#include "llvm/DebugInfo/DWARF/DWARFUnit.h"
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#include "llvm/Support/Errc.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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Error RangeListEntry::extract(DWARFDataExtractor Data, uint32_t End,
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uint32_t *OffsetPtr) {
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Offset = *OffsetPtr;
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SectionIndex = -1ULL;
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// The caller should guarantee that we have at least 1 byte available, so
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// we just assert instead of revalidate.
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assert(*OffsetPtr < End &&
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"not enough space to extract a rangelist encoding");
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uint8_t Encoding = Data.getU8(OffsetPtr);
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switch (Encoding) {
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case dwarf::DW_RLE_end_of_list:
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Value0 = Value1 = 0;
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break;
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// TODO: Support other encodings.
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case dwarf::DW_RLE_base_addressx: {
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uint32_t PreviousOffset = *OffsetPtr - 1;
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Value0 = Data.getULEB128(OffsetPtr);
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if (End < *OffsetPtr)
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return createStringError(
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errc::invalid_argument,
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"read past end of table when reading "
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"DW_RLE_base_addressx encoding at offset 0x%" PRIx32,
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PreviousOffset);
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break;
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}
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case dwarf::DW_RLE_startx_endx:
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return createStringError(errc::not_supported,
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"unsupported rnglists encoding DW_RLE_startx_endx at "
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"offset 0x%" PRIx32,
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*OffsetPtr - 1);
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case dwarf::DW_RLE_startx_length: {
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uint32_t PreviousOffset = *OffsetPtr - 1;
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Value0 = Data.getULEB128(OffsetPtr);
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Value1 = Data.getULEB128(OffsetPtr);
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if (End < *OffsetPtr)
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return createStringError(
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errc::invalid_argument,
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"read past end of table when reading "
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"DW_RLE_startx_length encoding at offset 0x%" PRIx32,
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PreviousOffset);
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break;
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}
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case dwarf::DW_RLE_offset_pair: {
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uint32_t PreviousOffset = *OffsetPtr - 1;
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Value0 = Data.getULEB128(OffsetPtr);
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Value1 = Data.getULEB128(OffsetPtr);
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if (End < *OffsetPtr)
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return createStringError(errc::invalid_argument,
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"read past end of table when reading "
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"DW_RLE_offset_pair encoding at offset 0x%" PRIx32,
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PreviousOffset);
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break;
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}
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case dwarf::DW_RLE_base_address: {
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if ((End - *OffsetPtr) < Data.getAddressSize())
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return createStringError(errc::invalid_argument,
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"insufficient space remaining in table for "
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"DW_RLE_base_address encoding at offset 0x%" PRIx32,
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*OffsetPtr - 1);
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Value0 = Data.getRelocatedAddress(OffsetPtr, &SectionIndex);
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break;
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}
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case dwarf::DW_RLE_start_end: {
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if ((End - *OffsetPtr) < unsigned(Data.getAddressSize() * 2))
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return createStringError(errc::invalid_argument,
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"insufficient space remaining in table for "
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"DW_RLE_start_end encoding "
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"at offset 0x%" PRIx32,
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*OffsetPtr - 1);
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Value0 = Data.getRelocatedAddress(OffsetPtr, &SectionIndex);
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Value1 = Data.getRelocatedAddress(OffsetPtr);
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break;
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}
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case dwarf::DW_RLE_start_length: {
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uint32_t PreviousOffset = *OffsetPtr - 1;
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Value0 = Data.getRelocatedAddress(OffsetPtr, &SectionIndex);
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Value1 = Data.getULEB128(OffsetPtr);
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if (End < *OffsetPtr)
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return createStringError(errc::invalid_argument,
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"read past end of table when reading "
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"DW_RLE_start_length encoding at offset 0x%" PRIx32,
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PreviousOffset);
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break;
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}
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default:
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return createStringError(errc::not_supported,
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"unknown rnglists encoding 0x%" PRIx32
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" at offset 0x%" PRIx32,
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uint32_t(Encoding), *OffsetPtr - 1);
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}
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EntryKind = Encoding;
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return Error::success();
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}
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DWARFAddressRangesVector
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DWARFDebugRnglist::getAbsoluteRanges(llvm::Optional<SectionedAddress> BaseAddr,
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DWARFUnit &U) const {
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DWARFAddressRangesVector Res;
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for (const RangeListEntry &RLE : Entries) {
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if (RLE.EntryKind == dwarf::DW_RLE_end_of_list)
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break;
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if (RLE.EntryKind == dwarf::DW_RLE_base_addressx) {
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BaseAddr = U.getAddrOffsetSectionItem(RLE.Value0);
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if (!BaseAddr)
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BaseAddr = {RLE.Value0, -1ULL};
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continue;
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}
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if (RLE.EntryKind == dwarf::DW_RLE_base_address) {
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BaseAddr = {RLE.Value0, RLE.SectionIndex};
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continue;
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}
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DWARFAddressRange E;
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E.SectionIndex = RLE.SectionIndex;
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if (BaseAddr && E.SectionIndex == -1ULL)
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E.SectionIndex = BaseAddr->SectionIndex;
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switch (RLE.EntryKind) {
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case dwarf::DW_RLE_offset_pair:
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E.LowPC = RLE.Value0;
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E.HighPC = RLE.Value1;
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if (BaseAddr) {
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E.LowPC += BaseAddr->Address;
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E.HighPC += BaseAddr->Address;
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}
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break;
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case dwarf::DW_RLE_start_end:
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E.LowPC = RLE.Value0;
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E.HighPC = RLE.Value1;
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break;
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case dwarf::DW_RLE_start_length:
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E.LowPC = RLE.Value0;
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E.HighPC = E.LowPC + RLE.Value1;
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break;
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case dwarf::DW_RLE_startx_length: {
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auto Start = U.getAddrOffsetSectionItem(RLE.Value0);
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if (!Start)
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Start = {0, -1ULL};
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E.SectionIndex = Start->SectionIndex;
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E.LowPC = Start->Address;
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E.HighPC = E.LowPC + RLE.Value1;
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break;
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}
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default:
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// Unsupported encodings should have been reported during extraction,
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// so we should not run into any here.
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llvm_unreachable("Unsupported range list encoding");
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}
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Res.push_back(E);
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}
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return Res;
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}
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void RangeListEntry::dump(
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raw_ostream &OS, uint8_t AddrSize, uint8_t MaxEncodingStringLength,
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uint64_t &CurrentBase, DIDumpOptions DumpOpts,
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llvm::function_ref<Optional<SectionedAddress>(uint32_t)>
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LookupPooledAddress) const {
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auto PrintRawEntry = [](raw_ostream &OS, const RangeListEntry &Entry,
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uint8_t AddrSize, DIDumpOptions DumpOpts) {
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if (DumpOpts.Verbose) {
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DumpOpts.DisplayRawContents = true;
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DWARFAddressRange(Entry.Value0, Entry.Value1)
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.dump(OS, AddrSize, DumpOpts);
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OS << " => ";
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}
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};
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if (DumpOpts.Verbose) {
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// Print the section offset in verbose mode.
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OS << format("0x%8.8" PRIx32 ":", Offset);
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auto EncodingString = dwarf::RangeListEncodingString(EntryKind);
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// Unsupported encodings should have been reported during parsing.
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assert(!EncodingString.empty() && "Unknown range entry encoding");
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OS << format(" [%s%*c", EncodingString.data(),
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MaxEncodingStringLength - EncodingString.size() + 1, ']');
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if (EntryKind != dwarf::DW_RLE_end_of_list)
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OS << ": ";
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}
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switch (EntryKind) {
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case dwarf::DW_RLE_end_of_list:
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OS << (DumpOpts.Verbose ? "" : "<End of list>");
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break;
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// case dwarf::DW_RLE_base_addressx:
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case dwarf::DW_RLE_base_addressx: {
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if (auto SA = LookupPooledAddress(Value0))
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CurrentBase = SA->Address;
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else
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CurrentBase = Value0;
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if (!DumpOpts.Verbose)
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return;
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OS << format(" 0x%*.*" PRIx64, AddrSize * 2, AddrSize * 2, Value0);
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break;
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}
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case dwarf::DW_RLE_base_address:
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// In non-verbose mode we do not print anything for this entry.
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CurrentBase = Value0;
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if (!DumpOpts.Verbose)
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return;
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OS << format(" 0x%*.*" PRIx64, AddrSize * 2, AddrSize * 2, Value0);
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break;
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case dwarf::DW_RLE_start_length:
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PrintRawEntry(OS, *this, AddrSize, DumpOpts);
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DWARFAddressRange(Value0, Value0 + Value1).dump(OS, AddrSize, DumpOpts);
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break;
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case dwarf::DW_RLE_offset_pair:
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PrintRawEntry(OS, *this, AddrSize, DumpOpts);
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DWARFAddressRange(Value0 + CurrentBase, Value1 + CurrentBase)
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.dump(OS, AddrSize, DumpOpts);
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break;
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case dwarf::DW_RLE_start_end:
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DWARFAddressRange(Value0, Value1).dump(OS, AddrSize, DumpOpts);
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break;
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case dwarf::DW_RLE_startx_length: {
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PrintRawEntry(OS, *this, AddrSize, DumpOpts);
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uint64_t Start = 0;
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if (auto SA = LookupPooledAddress(Value0))
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Start = SA->Address;
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DWARFAddressRange(Start, Start + Value1).dump(OS, AddrSize, DumpOpts);
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break;
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} break;
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default:
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llvm_unreachable("Unsupported range list encoding");
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}
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OS << "\n";
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}
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