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Diffstat (limited to 'lib/Transforms/Utils/SanitizerStats.cpp')
-rw-r--r-- | lib/Transforms/Utils/SanitizerStats.cpp | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/lib/Transforms/Utils/SanitizerStats.cpp b/lib/Transforms/Utils/SanitizerStats.cpp new file mode 100644 index 000000000000..9afd175c10ed --- /dev/null +++ b/lib/Transforms/Utils/SanitizerStats.cpp @@ -0,0 +1,108 @@ +//===- 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); +} |