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