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//=== ValueProfilePlugins.inc - set of plugins used by ValueProfileCollector =//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file contains a set of plugin classes used in ValueProfileCollectorImpl.
// Each plugin is responsible for collecting Value Profiling candidates for a
// particular optimization.
// Each plugin must satisfy the interface described in ValueProfileCollector.cpp
//
//===----------------------------------------------------------------------===//
#include "ValueProfileCollector.h"
#include "llvm/Analysis/IndirectCallVisitor.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/IR/InstVisitor.h"
using namespace llvm;
using CandidateInfo = ValueProfileCollector::CandidateInfo;
extern cl::opt<bool> MemOPOptMemcmpBcmp;
///--------------------------- MemIntrinsicPlugin ------------------------------
class MemIntrinsicPlugin : public InstVisitor<MemIntrinsicPlugin> {
Function &F;
TargetLibraryInfo &TLI;
std::vector<CandidateInfo> *Candidates;
public:
static constexpr InstrProfValueKind Kind = IPVK_MemOPSize;
MemIntrinsicPlugin(Function &Fn, TargetLibraryInfo &TLI)
: F(Fn), TLI(TLI), Candidates(nullptr) {}
void run(std::vector<CandidateInfo> &Cs) {
Candidates = &Cs;
visit(F);
Candidates = nullptr;
}
void visitMemIntrinsic(MemIntrinsic &MI) {
Value *Length = MI.getLength();
// Not instrument constant length calls.
if (isa<ConstantInt>(Length))
return;
Instruction *InsertPt = &MI;
Instruction *AnnotatedInst = &MI;
Candidates->emplace_back(CandidateInfo{Length, InsertPt, AnnotatedInst});
}
void visitCallInst(CallInst &CI) {
if (!MemOPOptMemcmpBcmp)
return;
auto *F = CI.getCalledFunction();
if (!F)
return;
LibFunc Func;
if (TLI.getLibFunc(CI, Func) &&
(Func == LibFunc_memcmp || Func == LibFunc_bcmp)) {
Value *Length = CI.getArgOperand(2);
// Not instrument constant length calls.
if (isa<ConstantInt>(Length))
return;
Instruction *InsertPt = &CI;
Instruction *AnnotatedInst = &CI;
Candidates->emplace_back(CandidateInfo{Length, InsertPt, AnnotatedInst});
}
}
};
///------------------------ IndirectCallPromotionPlugin ------------------------
class IndirectCallPromotionPlugin {
Function &F;
public:
static constexpr InstrProfValueKind Kind = IPVK_IndirectCallTarget;
IndirectCallPromotionPlugin(Function &Fn, TargetLibraryInfo &TLI) : F(Fn) {}
void run(std::vector<CandidateInfo> &Candidates) {
std::vector<CallBase *> Result = findIndirectCalls(F);
for (Instruction *I : Result) {
Value *Callee = cast<CallBase>(I)->getCalledOperand();
Instruction *InsertPt = I;
Instruction *AnnotatedInst = I;
Candidates.emplace_back(CandidateInfo{Callee, InsertPt, AnnotatedInst});
}
}
};
///----------------------- Registration of the plugins -------------------------
/// For now, registering a plugin with the ValueProfileCollector is done by
/// adding the plugin type to the VP_PLUGIN_LIST macro.
#define VP_PLUGIN_LIST \
MemIntrinsicPlugin, \
IndirectCallPromotionPlugin
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