forked from OSchip/llvm-project
233 lines
8.2 KiB
C++
233 lines
8.2 KiB
C++
//==-- handle_llvm.cpp - Helper function for Clang fuzzers -----------------==//
|
|
//
|
|
// 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Implements HandleLLVM for use by the Clang fuzzers. First runs a loop
|
|
// vectorizer optimization pass over the given IR code. Then mimics lli on both
|
|
// versions to JIT the generated code and execute it. Currently, functions are
|
|
// executed on dummy inputs.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "handle_llvm.h"
|
|
#include "input_arrays.h"
|
|
|
|
#include "llvm/ADT/Triple.h"
|
|
#include "llvm/Analysis/TargetLibraryInfo.h"
|
|
#include "llvm/Analysis/TargetTransformInfo.h"
|
|
#include "llvm/CodeGen/CommandFlags.h"
|
|
#include "llvm/CodeGen/MachineModuleInfo.h"
|
|
#include "llvm/CodeGen/TargetPassConfig.h"
|
|
#include "llvm/ExecutionEngine/JITEventListener.h"
|
|
#include "llvm/ExecutionEngine/JITSymbol.h"
|
|
#include "llvm/ExecutionEngine/MCJIT.h"
|
|
#include "llvm/ExecutionEngine/ObjectCache.h"
|
|
#include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
|
|
#include "llvm/ExecutionEngine/SectionMemoryManager.h"
|
|
#include "llvm/IR/IRPrintingPasses.h"
|
|
#include "llvm/IR/LLVMContext.h"
|
|
#include "llvm/IR/LegacyPassManager.h"
|
|
#include "llvm/IR/LegacyPassNameParser.h"
|
|
#include "llvm/IR/Module.h"
|
|
#include "llvm/IR/Verifier.h"
|
|
#include "llvm/IRReader/IRReader.h"
|
|
#include "llvm/MC/TargetRegistry.h"
|
|
#include "llvm/Pass.h"
|
|
#include "llvm/PassRegistry.h"
|
|
#include "llvm/Support/MemoryBuffer.h"
|
|
#include "llvm/Support/SourceMgr.h"
|
|
#include "llvm/Support/TargetSelect.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
#include "llvm/Transforms/IPO.h"
|
|
#include "llvm/Transforms/IPO/PassManagerBuilder.h"
|
|
#include "llvm/Transforms/Vectorize.h"
|
|
|
|
using namespace llvm;
|
|
|
|
static codegen::RegisterCodeGenFlags CGF;
|
|
|
|
// Define a type for the functions that are compiled and executed
|
|
typedef void (*LLVMFunc)(int*, int*, int*, int);
|
|
|
|
// Helper function to parse command line args and find the optimization level
|
|
static void getOptLevel(const std::vector<const char *> &ExtraArgs,
|
|
CodeGenOpt::Level &OLvl) {
|
|
// Find the optimization level from the command line args
|
|
OLvl = CodeGenOpt::Default;
|
|
for (auto &A : ExtraArgs) {
|
|
if (A[0] == '-' && A[1] == 'O') {
|
|
switch(A[2]) {
|
|
case '0': OLvl = CodeGenOpt::None; break;
|
|
case '1': OLvl = CodeGenOpt::Less; break;
|
|
case '2': OLvl = CodeGenOpt::Default; break;
|
|
case '3': OLvl = CodeGenOpt::Aggressive; break;
|
|
default:
|
|
errs() << "error: opt level must be between 0 and 3.\n";
|
|
std::exit(1);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void ErrorAndExit(std::string message) {
|
|
errs()<< "ERROR: " << message << "\n";
|
|
std::exit(1);
|
|
}
|
|
|
|
// Helper function to add optimization passes to the TargetMachine at the
|
|
// specified optimization level, OptLevel
|
|
static void AddOptimizationPasses(legacy::PassManagerBase &MPM,
|
|
CodeGenOpt::Level OptLevel,
|
|
unsigned SizeLevel) {
|
|
// Create and initialize a PassManagerBuilder
|
|
PassManagerBuilder Builder;
|
|
Builder.OptLevel = OptLevel;
|
|
Builder.SizeLevel = SizeLevel;
|
|
Builder.Inliner = createFunctionInliningPass(OptLevel, SizeLevel, false);
|
|
Builder.LoopVectorize = true;
|
|
Builder.populateModulePassManager(MPM);
|
|
}
|
|
|
|
// Mimics the opt tool to run an optimization pass over the provided IR
|
|
static std::string OptLLVM(const std::string &IR, CodeGenOpt::Level OLvl) {
|
|
// Create a module that will run the optimization passes
|
|
SMDiagnostic Err;
|
|
LLVMContext Context;
|
|
std::unique_ptr<Module> M = parseIR(MemoryBufferRef(IR, "IR"), Err, Context);
|
|
if (!M || verifyModule(*M, &errs()))
|
|
ErrorAndExit("Could not parse IR");
|
|
|
|
Triple ModuleTriple(M->getTargetTriple());
|
|
const TargetOptions Options =
|
|
codegen::InitTargetOptionsFromCodeGenFlags(ModuleTriple);
|
|
std::string E;
|
|
const Target *TheTarget =
|
|
TargetRegistry::lookupTarget(codegen::getMArch(), ModuleTriple, E);
|
|
if (!TheTarget)
|
|
ErrorAndExit(E);
|
|
|
|
std::unique_ptr<TargetMachine> TM(TheTarget->createTargetMachine(
|
|
M->getTargetTriple(), codegen::getCPUStr(), codegen::getFeaturesStr(),
|
|
Options, codegen::getExplicitRelocModel(),
|
|
codegen::getExplicitCodeModel(), OLvl));
|
|
if (!TM)
|
|
ErrorAndExit("Could not create target machine");
|
|
|
|
codegen::setFunctionAttributes(codegen::getCPUStr(),
|
|
codegen::getFeaturesStr(), *M);
|
|
|
|
legacy::PassManager Passes;
|
|
|
|
Passes.add(new TargetLibraryInfoWrapperPass(ModuleTriple));
|
|
Passes.add(createTargetTransformInfoWrapperPass(TM->getTargetIRAnalysis()));
|
|
|
|
LLVMTargetMachine <M = static_cast<LLVMTargetMachine &>(*TM);
|
|
Passes.add(LTM.createPassConfig(Passes));
|
|
|
|
Passes.add(createVerifierPass());
|
|
|
|
AddOptimizationPasses(Passes, OLvl, 0);
|
|
|
|
// Add a pass that writes the optimized IR to an output stream
|
|
std::string outString;
|
|
raw_string_ostream OS(outString);
|
|
Passes.add(createPrintModulePass(OS, "", false));
|
|
|
|
Passes.run(*M);
|
|
|
|
return OS.str();
|
|
}
|
|
|
|
// Takes a function and runs it on a set of inputs
|
|
// First determines whether f is the optimized or unoptimized function
|
|
static void RunFuncOnInputs(LLVMFunc f, int Arr[kNumArrays][kArraySize]) {
|
|
for (int i = 0; i < kNumArrays / 3; i++)
|
|
f(Arr[i], Arr[i + (kNumArrays / 3)], Arr[i + (2 * kNumArrays / 3)],
|
|
kArraySize);
|
|
}
|
|
|
|
// Takes a string of IR and compiles it using LLVM's JIT Engine
|
|
static void CreateAndRunJITFunc(const std::string &IR, CodeGenOpt::Level OLvl) {
|
|
SMDiagnostic Err;
|
|
LLVMContext Context;
|
|
std::unique_ptr<Module> M = parseIR(MemoryBufferRef(IR, "IR"), Err, Context);
|
|
if (!M)
|
|
ErrorAndExit("Could not parse IR");
|
|
|
|
Function *EntryFunc = M->getFunction("foo");
|
|
if (!EntryFunc)
|
|
ErrorAndExit("Function not found in module");
|
|
|
|
std::string ErrorMsg;
|
|
Triple ModuleTriple(M->getTargetTriple());
|
|
|
|
EngineBuilder builder(std::move(M));
|
|
builder.setMArch(codegen::getMArch());
|
|
builder.setMCPU(codegen::getCPUStr());
|
|
builder.setMAttrs(codegen::getFeatureList());
|
|
builder.setErrorStr(&ErrorMsg);
|
|
builder.setEngineKind(EngineKind::JIT);
|
|
builder.setMCJITMemoryManager(std::make_unique<SectionMemoryManager>());
|
|
builder.setOptLevel(OLvl);
|
|
builder.setTargetOptions(
|
|
codegen::InitTargetOptionsFromCodeGenFlags(ModuleTriple));
|
|
|
|
std::unique_ptr<ExecutionEngine> EE(builder.create());
|
|
if (!EE)
|
|
ErrorAndExit("Could not create execution engine");
|
|
|
|
EE->finalizeObject();
|
|
EE->runStaticConstructorsDestructors(false);
|
|
|
|
#if defined(__GNUC__) && !defined(__clang) && \
|
|
((__GNUC__ == 4) && (__GNUC_MINOR__ < 9))
|
|
// Silence
|
|
//
|
|
// warning: ISO C++ forbids casting between pointer-to-function and
|
|
// pointer-to-object [-Wpedantic]
|
|
//
|
|
// Since C++11 this casting is conditionally supported and GCC versions
|
|
// starting from 4.9.0 don't warn about the cast.
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wpedantic"
|
|
#endif
|
|
LLVMFunc f = reinterpret_cast<LLVMFunc>(EE->getPointerToFunction(EntryFunc));
|
|
#if defined(__GNUC__) && !defined(__clang) && \
|
|
((__GNUC__ == 4) && (__GNUC_MINOR__ < 9))
|
|
#pragma GCC diagnostic pop
|
|
#endif
|
|
|
|
// Figure out if we are running the optimized func or the unoptimized func
|
|
RunFuncOnInputs(f, (OLvl == CodeGenOpt::None) ? UnoptArrays : OptArrays);
|
|
|
|
EE->runStaticConstructorsDestructors(true);
|
|
}
|
|
|
|
// Main fuzz target called by ExampleClangLLVMProtoFuzzer.cpp
|
|
// Mimics the lli tool to JIT the LLVM IR code and execute it
|
|
void clang_fuzzer::HandleLLVM(const std::string &IR,
|
|
const std::vector<const char *> &ExtraArgs) {
|
|
// Populate OptArrays and UnoptArrays with the arrays from InputArrays
|
|
memcpy(OptArrays, InputArrays, kTotalSize);
|
|
memcpy(UnoptArrays, InputArrays, kTotalSize);
|
|
|
|
// Parse ExtraArgs to set the optimization level
|
|
CodeGenOpt::Level OLvl;
|
|
getOptLevel(ExtraArgs, OLvl);
|
|
|
|
// First we optimize the IR by running a loop vectorizer pass
|
|
std::string OptIR = OptLLVM(IR, OLvl);
|
|
|
|
CreateAndRunJITFunc(OptIR, OLvl);
|
|
CreateAndRunJITFunc(IR, CodeGenOpt::None);
|
|
|
|
if (memcmp(OptArrays, UnoptArrays, kTotalSize))
|
|
ErrorAndExit("!!!BUG!!!");
|
|
|
|
return;
|
|
}
|