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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
134 lines
4.2 KiB
C++
134 lines
4.2 KiB
C++
//===- DWARFDebugAranges.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/DWARFDebugAranges.h"
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#include "llvm/DebugInfo/DWARF/DWARFCompileUnit.h"
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#include "llvm/DebugInfo/DWARF/DWARFContext.h"
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#include "llvm/DebugInfo/DWARF/DWARFDebugArangeSet.h"
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#include "llvm/Support/DataExtractor.h"
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#include "llvm/Support/WithColor.h"
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#include <algorithm>
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#include <cassert>
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#include <cstdint>
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#include <set>
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#include <vector>
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using namespace llvm;
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void DWARFDebugAranges::extract(DataExtractor DebugArangesData) {
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if (!DebugArangesData.isValidOffset(0))
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return;
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uint32_t Offset = 0;
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DWARFDebugArangeSet Set;
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while (Set.extract(DebugArangesData, &Offset)) {
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uint32_t CUOffset = Set.getCompileUnitDIEOffset();
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for (const auto &Desc : Set.descriptors()) {
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uint64_t LowPC = Desc.Address;
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uint64_t HighPC = Desc.getEndAddress();
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appendRange(CUOffset, LowPC, HighPC);
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}
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ParsedCUOffsets.insert(CUOffset);
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}
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}
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void DWARFDebugAranges::generate(DWARFContext *CTX) {
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clear();
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if (!CTX)
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return;
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// Extract aranges from .debug_aranges section.
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DataExtractor ArangesData(CTX->getDWARFObj().getARangeSection(),
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CTX->isLittleEndian(), 0);
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extract(ArangesData);
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// Generate aranges from DIEs: even if .debug_aranges section is present,
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// it may describe only a small subset of compilation units, so we need to
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// manually build aranges for the rest of them.
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for (const auto &CU : CTX->compile_units()) {
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uint32_t CUOffset = CU->getOffset();
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if (ParsedCUOffsets.insert(CUOffset).second) {
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Expected<DWARFAddressRangesVector> CURanges = CU->collectAddressRanges();
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if (!CURanges)
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WithColor::error() << toString(CURanges.takeError()) << '\n';
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else
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for (const auto &R : *CURanges)
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appendRange(CUOffset, R.LowPC, R.HighPC);
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}
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}
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construct();
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}
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void DWARFDebugAranges::clear() {
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Endpoints.clear();
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Aranges.clear();
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ParsedCUOffsets.clear();
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}
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void DWARFDebugAranges::appendRange(uint32_t CUOffset, uint64_t LowPC,
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uint64_t HighPC) {
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if (LowPC >= HighPC)
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return;
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Endpoints.emplace_back(LowPC, CUOffset, true);
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Endpoints.emplace_back(HighPC, CUOffset, false);
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}
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void DWARFDebugAranges::construct() {
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std::multiset<uint32_t> ValidCUs; // Maintain the set of CUs describing
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// a current address range.
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llvm::sort(Endpoints);
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uint64_t PrevAddress = -1ULL;
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for (const auto &E : Endpoints) {
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if (PrevAddress < E.Address && !ValidCUs.empty()) {
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// If the address range between two endpoints is described by some
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// CU, first try to extend the last range in Aranges. If we can't
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// do it, start a new range.
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if (!Aranges.empty() && Aranges.back().HighPC() == PrevAddress &&
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ValidCUs.find(Aranges.back().CUOffset) != ValidCUs.end()) {
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Aranges.back().setHighPC(E.Address);
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} else {
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Aranges.emplace_back(PrevAddress, E.Address, *ValidCUs.begin());
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}
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}
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// Update the set of valid CUs.
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if (E.IsRangeStart) {
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ValidCUs.insert(E.CUOffset);
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} else {
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auto CUPos = ValidCUs.find(E.CUOffset);
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assert(CUPos != ValidCUs.end());
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ValidCUs.erase(CUPos);
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}
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PrevAddress = E.Address;
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}
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assert(ValidCUs.empty());
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// Endpoints are not needed now.
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Endpoints.clear();
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Endpoints.shrink_to_fit();
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}
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uint32_t DWARFDebugAranges::findAddress(uint64_t Address) const {
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if (!Aranges.empty()) {
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Range range(Address);
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RangeCollIterator begin = Aranges.begin();
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RangeCollIterator end = Aranges.end();
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RangeCollIterator pos =
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std::lower_bound(begin, end, range);
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if (pos != end && pos->containsAddress(Address)) {
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return pos->CUOffset;
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} else if (pos != begin) {
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--pos;
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if (pos->containsAddress(Address))
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return pos->CUOffset;
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}
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}
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return -1U;
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}
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