//
//===----------------------------------------------------------------------===//
//
-// Implements HandleLLVM for use by the Clang fuzzers. Mimics the llc tool to
-// compile an LLVM IR file to X86_64 assembly.
+// 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 "llvm/ADT/Triple.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
+#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/CodeGen/CommandFlags.inc"
#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/LegacyPassManager.h"
+#include "llvm/IR/LegacyPassNameParser.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Verifier.h"
#include "llvm/IRReader/IRReader.h"
+#include "llvm/Pass.h"
#include "llvm/PassRegistry.h"
-#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/TargetSelect.h"
#include "llvm/Target/TargetMachine.h"
-
-#include <cstdlib>
+#include "llvm/Transforms/IPO/PassManagerBuilder.h"
+#include "llvm/Transforms/IPO.h"
+#include "llvm/Transforms/Vectorize.h"
using namespace llvm;
+// 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
}
}
-void clang_fuzzer::HandleLLVM(const std::string &S,
- const std::vector<const char *> &ExtraArgs) {
- // Parse ExtraArgs to set the optimization level
- CodeGenOpt::Level OLvl;
- getOptLevel(ExtraArgs, OLvl);
+void ErrorAndExit(std::string message) {
+ errs()<< "ERROR: " << message << "\n";
+ std::exit(1);
+}
- // Set the Module to include the the IR code to be compiled
- SMDiagnostic Err;
+// 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
+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(S, "IR"), Err, Context);
- if (!M) {
- errs() << "error: could not parse IR!\n";
- std::exit(1);
- }
+ std::unique_ptr<Module> M = parseIR(MemoryBufferRef(IR, "IR"), Err, Context);
+ if (!M || verifyModule(*M, &errs()))
+ ErrorAndExit("Could not parse IR");
- // Create a new Target
- std::string Error;
- const Target *TheTarget = TargetRegistry::lookupTarget(
- sys::getDefaultTargetTriple(), Error);
- if (!TheTarget) {
- errs() << Error;
- std::exit(1);
- }
+ setFunctionAttributes(getCPUStr(), getFeaturesStr(), *M);
+
+ legacy::PassManager Passes;
+ Triple ModuleTriple(M->getTargetTriple());
+
+ Passes.add(new TargetLibraryInfoWrapperPass(ModuleTriple));
+ Passes.add(createTargetTransformInfoWrapperPass(TargetIRAnalysis()));
+ Passes.add(createVerifierPass());
- TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
-
- // Create a new Machine
- std::string CPUStr = getCPUStr();
- std::string FeaturesStr = getFeaturesStr();
- std::unique_ptr<TargetMachine> Target(TheTarget->createTargetMachine(
- sys::getDefaultTargetTriple(), CPUStr, FeaturesStr, Options,
- getRelocModel(), getCodeModel(), OLvl));
-
- // Create a new PassManager
- legacy::PassManager PM;
- TargetLibraryInfoImpl TLII(Triple(M->getTargetTriple()));
- PM.add(new TargetLibraryInfoWrapperPass(TLII));
- M->setDataLayout(Target->createDataLayout());
-
- // Make sure the Module has no errors
- if (verifyModule(*M, &errs())) {
- errs() << "error: input module is broken!\n";
- std::exit(1);
- }
-
- setFunctionAttributes(CPUStr, FeaturesStr, *M);
+ AddOptimizationPasses(Passes, OLvl, 0);
- raw_null_ostream OS;
- Target->addPassesToEmitFile(PM, OS, nullptr, TargetMachine::CGFT_ObjectFile,
- false);
- PM.run(*M);
+ // 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));
- return;
+ Passes.run(*M);
+
+ return OS.str();
}
+void CreateAndRunJITFun(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;
+ EngineBuilder builder(std::move(M));
+ builder.setMArch(MArch);
+ builder.setMCPU(getCPUStr());
+ builder.setMAttrs(getFeatureList());
+ builder.setErrorStr(&ErrorMsg);
+ builder.setEngineKind(EngineKind::JIT);
+ builder.setUseOrcMCJITReplacement(false);
+ builder.setMCJITMemoryManager(make_unique<SectionMemoryManager>());
+ builder.setOptLevel(OLvl);
+ builder.setTargetOptions(InitTargetOptionsFromCodeGenFlags());
+
+ std::unique_ptr<ExecutionEngine> EE(builder.create());
+ if (!EE)
+ ErrorAndExit("Could not create execution engine");
+
+ EE->finalizeObject();
+ EE->runStaticConstructorsDestructors(false);
+
+ typedef void (*func)(int*, int*, int*, int);
+ func f = reinterpret_cast<func>(EE->getPointerToFunction(EntryFunc));
+
+ // Define some dummy arrays to use an input for now
+ int a[] = {1};
+ int b[] = {1};
+ int c[] = {1};
+ f(a, b, c, 1);
+
+ 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) {
+ // 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);
+
+ CreateAndRunJITFun(OptIR, OLvl);
+ CreateAndRunJITFun(IR, CodeGenOpt::None);
+
+ return;
+}
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