5f2a7fa67e
This patch is extracted from D96035, it adds support for the existing DWARFLinker functionality. What is not supported yet: 1. Types deduplication(--odr mode). 2. Modules deduplication. 3. Generation of index tables. Reland2: temporarily disabled call to "--linker llvm" for tls-variable.test and location-expression.test as it does not work properly on bigendian architecture. Differential Revision: https://reviews.llvm.org/D153268
103 lines
3.7 KiB
C++
103 lines
3.7 KiB
C++
//===- "DependencyTracker.h" ------------------------------------*- C++ -*-===//
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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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#ifndef LLVM_LIB_DWARFLINKERPARALLEL_DEPENDENCYTRACKER_H
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#define LLVM_LIB_DWARFLINKERPARALLEL_DEPENDENCYTRACKER_H
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#include "DWARFLinkerCompileUnit.h"
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#include "DWARFLinkerImpl.h"
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#include "llvm/ADT/SmallVector.h"
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namespace llvm {
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class DWARFDebugInfoEntry;
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class DWARFDie;
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namespace dwarflinker_parallel {
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/// This class discovers DIEs dependencies and marks "live" DIEs.
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class DependencyTracker {
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public:
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DependencyTracker(DWARFLinkerImpl::LinkContext &Context) : Context(Context) {}
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/// Recursively walk the \p DIE tree and look for DIEs to keep. Store that
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/// information in \p CU's DIEInfo.
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///
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/// This function is the entry point of the DIE selection algorithm. It is
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/// expected to walk the DIE tree and(through the mediation of
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/// Context.File.Addresses) ask for relocation adjustment value on each
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/// DIE that might be a 'root DIE'.
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///
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/// Returns true if all dependencies are correctly discovered. Inter-CU
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/// dependencies cannot be discovered if referenced CU is not analyzed yet.
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/// If that is the case this method returns false.
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bool resolveDependenciesAndMarkLiveness(CompileUnit &CU);
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/// Recursively walk the \p DIE tree and check "keepness" information.
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/// It is an error if parent node does not have "keep" flag, while
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/// child have one. This function dump error at stderr in that case.
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#ifndef NDEBUG
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static void verifyKeepChain(CompileUnit &CU);
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#endif
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protected:
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struct RootEntryTy {
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RootEntryTy(CompileUnit &CU, const DWARFDebugInfoEntry *RootEntry)
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: CU(CU), RootEntry(RootEntry) {}
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// Compile unit keeping root entry.
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CompileUnit &CU;
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// Root entry.
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const DWARFDebugInfoEntry *RootEntry;
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};
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using RootEntriesListTy = SmallVector<RootEntryTy>;
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/// This function navigates DIEs tree starting from specified \p Entry.
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/// It puts 'root DIE' into the worklist.
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void collectRootsToKeep(CompileUnit &CU, const DWARFDebugInfoEntry *Entry);
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/// Returns true if specified variable references live code section.
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bool isLiveVariableEntry(CompileUnit &CU, const DWARFDebugInfoEntry *Entry);
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/// Returns true if specified subprogram references live code section.
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bool isLiveSubprogramEntry(CompileUnit &CU, const DWARFDebugInfoEntry *Entry);
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/// Examine worklist and mark all 'root DIE's as kept.
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bool markLiveRootsAsKept();
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/// Mark whole DIE tree as kept recursively.
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bool markDIEEntryAsKeptRec(const RootEntryTy &RootItem, CompileUnit &CU,
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const DWARFDebugInfoEntry *Entry);
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/// Check referenced DIEs and add them into the worklist if neccessary.
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bool maybeAddReferencedRoots(const RootEntryTy &RootItem, CompileUnit &CU,
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const DWARFDebugInfoEntry *Entry);
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/// Add 'root DIE' into the worklist.
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void addItemToWorklist(CompileUnit &CU, const DWARFDebugInfoEntry *Entry);
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/// Set kind of placement(whether it goes into type table, plain dwarf or
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/// both) for the specified die \p DieIdx.
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void setDIEPlacementAndTypename(CompileUnit::DIEInfo &Info);
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/// Flag indicating whether liveness information should be examined.
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bool TrackLiveness = false;
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/// List of CU, Entry pairs which are 'root DIE's.
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RootEntriesListTy RootEntriesWorkList;
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/// Link context for the analyzed CU.
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DWARFLinkerImpl::LinkContext &Context;
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};
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} // end namespace dwarflinker_parallel
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} // end namespace llvm
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#endif // LLVM_LIB_DWARFLINKERPARALLEL_DEPENDENCYTRACKER_H
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