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108 lines
4.1 KiB
C++
108 lines
4.1 KiB
C++
//===- SanitizerStats.cpp - Sanitizer statistics gathering ----------------===//
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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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// Implements code generation for sanitizer statistics gathering.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Utils/SanitizerStats.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Transforms/Utils/ModuleUtils.h"
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using namespace llvm;
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SanitizerStatReport::SanitizerStatReport(Module *M) : M(M) {
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StatTy = ArrayType::get(Type::getInt8PtrTy(M->getContext()), 2);
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EmptyModuleStatsTy = makeModuleStatsTy();
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ModuleStatsGV = new GlobalVariable(*M, EmptyModuleStatsTy, false,
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GlobalValue::InternalLinkage, nullptr);
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}
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ArrayType *SanitizerStatReport::makeModuleStatsArrayTy() {
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return ArrayType::get(StatTy, Inits.size());
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}
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StructType *SanitizerStatReport::makeModuleStatsTy() {
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return StructType::get(M->getContext(), {Type::getInt8PtrTy(M->getContext()),
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Type::getInt32Ty(M->getContext()),
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makeModuleStatsArrayTy()});
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}
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void SanitizerStatReport::create(IRBuilder<> &B, SanitizerStatKind SK) {
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Function *F = B.GetInsertBlock()->getParent();
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Module *M = F->getParent();
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PointerType *Int8PtrTy = B.getInt8PtrTy();
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IntegerType *IntPtrTy = B.getIntPtrTy(M->getDataLayout());
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ArrayType *StatTy = ArrayType::get(Int8PtrTy, 2);
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Inits.push_back(ConstantArray::get(
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StatTy,
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{Constant::getNullValue(Int8PtrTy),
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ConstantExpr::getIntToPtr(
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ConstantInt::get(IntPtrTy, uint64_t(SK) << (IntPtrTy->getBitWidth() -
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kSanitizerStatKindBits)),
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Int8PtrTy)}));
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FunctionType *StatReportTy =
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FunctionType::get(B.getVoidTy(), Int8PtrTy, false);
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Constant *StatReport = M->getOrInsertFunction(
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"__sanitizer_stat_report", StatReportTy);
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auto InitAddr = ConstantExpr::getGetElementPtr(
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EmptyModuleStatsTy, ModuleStatsGV,
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ArrayRef<Constant *>{
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ConstantInt::get(IntPtrTy, 0), ConstantInt::get(B.getInt32Ty(), 2),
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ConstantInt::get(IntPtrTy, Inits.size() - 1),
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});
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B.CreateCall(StatReport, ConstantExpr::getBitCast(InitAddr, Int8PtrTy));
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}
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void SanitizerStatReport::finish() {
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if (Inits.empty()) {
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ModuleStatsGV->eraseFromParent();
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return;
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}
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PointerType *Int8PtrTy = Type::getInt8PtrTy(M->getContext());
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IntegerType *Int32Ty = Type::getInt32Ty(M->getContext());
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Type *VoidTy = Type::getVoidTy(M->getContext());
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// Create a new ModuleStatsGV to replace the old one. We can't just set the
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// old one's initializer because its type is different.
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auto NewModuleStatsGV = new GlobalVariable(
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*M, makeModuleStatsTy(), false, GlobalValue::InternalLinkage,
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ConstantStruct::getAnon(
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{Constant::getNullValue(Int8PtrTy),
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ConstantInt::get(Int32Ty, Inits.size()),
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ConstantArray::get(makeModuleStatsArrayTy(), Inits)}));
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ModuleStatsGV->replaceAllUsesWith(
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ConstantExpr::getBitCast(NewModuleStatsGV, ModuleStatsGV->getType()));
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ModuleStatsGV->eraseFromParent();
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// Create a global constructor to register NewModuleStatsGV.
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auto F = Function::Create(FunctionType::get(VoidTy, false),
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GlobalValue::InternalLinkage, "", M);
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auto BB = BasicBlock::Create(M->getContext(), "", F);
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IRBuilder<> B(BB);
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FunctionType *StatInitTy = FunctionType::get(VoidTy, Int8PtrTy, false);
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Constant *StatInit = M->getOrInsertFunction(
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"__sanitizer_stat_init", StatInitTy);
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B.CreateCall(StatInit, ConstantExpr::getBitCast(NewModuleStatsGV, Int8PtrTy));
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B.CreateRetVoid();
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appendToGlobalCtors(*M, F, 0);
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}
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