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846be29e5e
Recommit r352791 after tweaking DerivedTypes.h slightly, so that gcc
doesn't choke on it, hopefully.
Original Message:
The FunctionCallee type is effectively a {FunctionType*,Value*} pair,
and is a useful convenience to enable code to continue passing the
result of getOrInsertFunction() through to EmitCall, even once pointer
types lose their pointee-type.
Then:
- update the CallInst/InvokeInst instruction creation functions to
take a Callee,
- modify getOrInsertFunction to return FunctionCallee, and
- update all callers appropriately.
One area of particular note is the change to the sanitizer
code. Previously, they had been casting the result of
`getOrInsertFunction` to a `Function*` via
`checkSanitizerInterfaceFunction`, and storing that. That would report
an error if someone had already inserted a function declaraction with
a mismatching signature.
However, in general, LLVM allows for such mismatches, as
`getOrInsertFunction` will automatically insert a bitcast if
needed. As part of this cleanup, cause the sanitizer code to do the
same. (It will call its functions using the expected signature,
however they may have been declared.)
Finally, in a small number of locations, callers of
`getOrInsertFunction` actually were expecting/requiring that a brand
new function was being created. In such cases, I've switched them to
Function::Create instead.
Differential Revision: https://reviews.llvm.org/D57315
llvm-svn: 352827
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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FunctionCallee StatReport =
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M->getOrInsertFunction("__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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FunctionCallee StatInit =
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M->getOrInsertFunction("__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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