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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
120 lines
4.3 KiB
C++
120 lines
4.3 KiB
C++
//===--- CodeGenPGO.h - PGO Instrumentation for LLVM CodeGen ----*- 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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//
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// Instrumentation-based profile-guided optimization
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_LIB_CODEGEN_CODEGENPGO_H
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#define LLVM_CLANG_LIB_CODEGEN_CODEGENPGO_H
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#include "CGBuilder.h"
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#include "CodeGenModule.h"
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#include "CodeGenTypes.h"
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#include "llvm/ProfileData/InstrProfReader.h"
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#include <array>
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#include <memory>
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namespace clang {
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namespace CodeGen {
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/// Per-function PGO state.
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class CodeGenPGO {
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private:
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CodeGenModule &CGM;
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std::string FuncName;
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llvm::GlobalVariable *FuncNameVar;
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std::array <unsigned, llvm::IPVK_Last + 1> NumValueSites;
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unsigned NumRegionCounters;
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uint64_t FunctionHash;
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std::unique_ptr<llvm::DenseMap<const Stmt *, unsigned>> RegionCounterMap;
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std::unique_ptr<llvm::DenseMap<const Stmt *, uint64_t>> StmtCountMap;
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std::unique_ptr<llvm::InstrProfRecord> ProfRecord;
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std::vector<uint64_t> RegionCounts;
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uint64_t CurrentRegionCount;
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public:
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CodeGenPGO(CodeGenModule &CGM)
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: CGM(CGM), NumValueSites({{0}}), NumRegionCounters(0), FunctionHash(0),
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CurrentRegionCount(0) {}
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/// Whether or not we have PGO region data for the current function. This is
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/// false both when we have no data at all and when our data has been
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/// discarded.
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bool haveRegionCounts() const { return !RegionCounts.empty(); }
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/// Return the counter value of the current region.
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uint64_t getCurrentRegionCount() const { return CurrentRegionCount; }
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/// Set the counter value for the current region. This is used to keep track
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/// of changes to the most recent counter from control flow and non-local
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/// exits.
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void setCurrentRegionCount(uint64_t Count) { CurrentRegionCount = Count; }
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/// Check if an execution count is known for a given statement. If so, return
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/// true and put the value in Count; else return false.
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Optional<uint64_t> getStmtCount(const Stmt *S) {
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if (!StmtCountMap)
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return None;
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auto I = StmtCountMap->find(S);
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if (I == StmtCountMap->end())
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return None;
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return I->second;
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}
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/// If the execution count for the current statement is known, record that
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/// as the current count.
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void setCurrentStmt(const Stmt *S) {
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if (auto Count = getStmtCount(S))
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setCurrentRegionCount(*Count);
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}
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/// Assign counters to regions and configure them for PGO of a given
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/// function. Does nothing if instrumentation is not enabled and either
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/// generates global variables or associates PGO data with each of the
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/// counters depending on whether we are generating or using instrumentation.
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void assignRegionCounters(GlobalDecl GD, llvm::Function *Fn);
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/// Emit a coverage mapping range with a counter zero
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/// for an unused declaration.
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void emitEmptyCounterMapping(const Decl *D, StringRef FuncName,
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llvm::GlobalValue::LinkageTypes Linkage);
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// Insert instrumentation or attach profile metadata at value sites
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void valueProfile(CGBuilderTy &Builder, uint32_t ValueKind,
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llvm::Instruction *ValueSite, llvm::Value *ValuePtr);
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private:
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void setFuncName(llvm::Function *Fn);
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void setFuncName(StringRef Name, llvm::GlobalValue::LinkageTypes Linkage);
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void mapRegionCounters(const Decl *D);
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void computeRegionCounts(const Decl *D);
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void applyFunctionAttributes(llvm::IndexedInstrProfReader *PGOReader,
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llvm::Function *Fn);
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void loadRegionCounts(llvm::IndexedInstrProfReader *PGOReader,
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bool IsInMainFile);
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bool skipRegionMappingForDecl(const Decl *D);
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void emitCounterRegionMapping(const Decl *D);
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public:
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void emitCounterIncrement(CGBuilderTy &Builder, const Stmt *S,
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llvm::Value *StepV);
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/// Return the region count for the counter at the given index.
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uint64_t getRegionCount(const Stmt *S) {
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if (!RegionCounterMap)
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return 0;
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if (!haveRegionCounts())
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return 0;
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return RegionCounts[(*RegionCounterMap)[S]];
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}
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};
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} // end namespace CodeGen
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} // end namespace clang
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#endif
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