return ParsePrototype();
}
+//===----------------------------------------------------------------------===//
+// Quick and dirty hack
+//===----------------------------------------------------------------------===//
+
+// FIXME: Obviously we can do better than this
+std::string GenerateUniqueName(const char *root)
+{
+ static int i = 0;
+ char s[16];
+ sprintf(s, "%s%d", root, i++);
+ std::string S = s;
+ return S;
+}
+
+std::string MakeLegalFunctionName(std::string Name)
+{
+ std::string NewName;
+ if (!Name.length())
+ return GenerateUniqueName("anon_func_");
+
+ // Start with what we have
+ NewName = Name;
+
+ // Look for a numberic first character
+ if (NewName.find_first_of("0123456789") == 0) {
+ NewName.insert(0, 1, 'n');
+ }
+
+ // Replace illegal characters with their ASCII equivalent
+ std::string legal_elements = "_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+ size_t pos;
+ while ((pos = NewName.find_first_not_of(legal_elements)) != std::string::npos) {
+ char old_c = NewName.at(pos);
+ char new_str[16];
+ sprintf(new_str, "%d", (int)old_c);
+ NewName = NewName.replace(pos, 1, new_str);
+ }
+
+ return NewName;
+}
+
+//===----------------------------------------------------------------------===//
+// MCJIT helper class
+//===----------------------------------------------------------------------===//
+
+class MCJITHelper
+{
+public:
+ MCJITHelper(LLVMContext& C) : Context(C), OpenModule(NULL) {}
+ ~MCJITHelper();
+
+ Function *getFunction(const std::string FnName);
+ Module *getModuleForNewFunction();
+ void *getPointerToFunction(Function* F);
+ void *getSymbolAddress(const std::string &Name);
+ void dump();
+
+private:
+ typedef std::vector<Module*> ModuleVector;
+ typedef std::vector<ExecutionEngine*> EngineVector;
+
+ LLVMContext &Context;
+ Module *OpenModule;
+ ModuleVector Modules;
+ EngineVector Engines;
+};
+
+class HelpingMemoryManager : public SectionMemoryManager
+{
+ HelpingMemoryManager(const HelpingMemoryManager&) LLVM_DELETED_FUNCTION;
+ void operator=(const HelpingMemoryManager&) LLVM_DELETED_FUNCTION;
+
+public:
+ HelpingMemoryManager(MCJITHelper *Helper) : MasterHelper(Helper) {}
+ virtual ~HelpingMemoryManager() {}
+
+ /// This method returns the address of the specified symbol.
+ /// Our implementation will attempt to find symbols in other
+ /// modules associated with the MCJITHelper to cross link symbols
+ /// from one generated module to another.
+ virtual uint64_t getSymbolAddress(const std::string &Name) override;
+private:
+ MCJITHelper *MasterHelper;
+};
+
+uint64_t HelpingMemoryManager::getSymbolAddress(const std::string &Name)
+{
+ uint64_t FnAddr = SectionMemoryManager::getSymbolAddress(Name);
+ if (FnAddr)
+ return FnAddr;
+
+ uint64_t HelperFun = (uint64_t) MasterHelper->getSymbolAddress(Name);
+ if (!HelperFun)
+ report_fatal_error("Program used extern function '" + Name +
+ "' which could not be resolved!");
+
+ return HelperFun;
+}
+
+MCJITHelper::~MCJITHelper()
+{
+ if (OpenModule)
+ delete OpenModule;
+ EngineVector::iterator begin = Engines.begin();
+ EngineVector::iterator end = Engines.end();
+ EngineVector::iterator it;
+ for (it = begin; it != end; ++it)
+ delete *it;
+}
+
+Function *MCJITHelper::getFunction(const std::string FnName) {
+ ModuleVector::iterator begin = Modules.begin();
+ ModuleVector::iterator end = Modules.end();
+ ModuleVector::iterator it;
+ for (it = begin; it != end; ++it) {
+ Function *F = (*it)->getFunction(FnName);
+ if (F) {
+ if (*it == OpenModule)
+ return F;
+
+ assert(OpenModule != NULL);
+
+ // This function is in a module that has already been JITed.
+ // We need to generate a new prototype for external linkage.
+ Function *PF = OpenModule->getFunction(FnName);
+ if (PF && !PF->empty()) {
+ ErrorF("redefinition of function across modules");
+ return 0;
+ }
+
+ // If we don't have a prototype yet, create one.
+ if (!PF)
+ PF = Function::Create(F->getFunctionType(),
+ Function::ExternalLinkage,
+ FnName,
+ OpenModule);
+ return PF;
+ }
+ }
+ return NULL;
+}
+
+Module *MCJITHelper::getModuleForNewFunction() {
+ // If we have a Module that hasn't been JITed, use that.
+ if (OpenModule)
+ return OpenModule;
+
+ // Otherwise create a new Module.
+ std::string ModName = GenerateUniqueName("mcjit_module_");
+ Module *M = new Module(ModName, Context);
+ Modules.push_back(M);
+ OpenModule = M;
+ return M;
+}
+
+void *MCJITHelper::getPointerToFunction(Function* F) {
+ // See if an existing instance of MCJIT has this function.
+ EngineVector::iterator begin = Engines.begin();
+ EngineVector::iterator end = Engines.end();
+ EngineVector::iterator it;
+ for (it = begin; it != end; ++it) {
+ void *P = (*it)->getPointerToFunction(F);
+ if (P)
+ return P;
+ }
+
+ // If we didn't find the function, see if we can generate it.
+ if (OpenModule) {
+ std::string ErrStr;
+ ExecutionEngine *NewEngine = EngineBuilder(std::unique_ptr<Module>(OpenModule))
+ .setErrorStr(&ErrStr)
+ .setMCJITMemoryManager(std::unique_ptr<HelpingMemoryManager>(new HelpingMemoryManager(this)))
+ .create();
+ if (!NewEngine) {
+ fprintf(stderr, "Could not create ExecutionEngine: %s\n", ErrStr.c_str());
+ exit(1);
+ }
+
+ // Create a function pass manager for this engine
+ FunctionPassManager *FPM = new FunctionPassManager(OpenModule);
+
+ // Set up the optimizer pipeline. Start with registering info about how the
+ // target lays out data structures.
+ OpenModule->setDataLayout(NewEngine->getDataLayout());
+ FPM->add(new DataLayoutPass());
+ // Provide basic AliasAnalysis support for GVN.
+ FPM->add(createBasicAliasAnalysisPass());
+ // Promote allocas to registers.
+ FPM->add(createPromoteMemoryToRegisterPass());
+ // Do simple "peephole" optimizations and bit-twiddling optzns.
+ FPM->add(createInstructionCombiningPass());
+ // Reassociate expressions.
+ FPM->add(createReassociatePass());
+ // Eliminate Common SubExpressions.
+ FPM->add(createGVNPass());
+ // Simplify the control flow graph (deleting unreachable blocks, etc).
+ FPM->add(createCFGSimplificationPass());
+ FPM->doInitialization();
+
+ // For each function in the module
+ Module::iterator it;
+ Module::iterator end = OpenModule->end();
+ for (it = OpenModule->begin(); it != end; ++it) {
+ // Run the FPM on this function
+ FPM->run(*it);
+ }
+
+ // We don't need this anymore
+ delete FPM;
+
+ OpenModule = NULL;
+ Engines.push_back(NewEngine);
+ NewEngine->finalizeObject();
+ return NewEngine->getPointerToFunction(F);
+ }
+ return NULL;
+}
+
+void *MCJITHelper::getSymbolAddress(const std::string &Name)
+{
+ // Look for the symbol in each of our execution engines.
+ EngineVector::iterator begin = Engines.begin();
+ EngineVector::iterator end = Engines.end();
+ EngineVector::iterator it;
+ for (it = begin; it != end; ++it) {
+ uint64_t FAddr = (*it)->getFunctionAddress(Name);
+ if (FAddr) {
+ return (void *)FAddr;
+ }
+ }
+ return NULL;
+}
+
+void MCJITHelper::dump()
+{
+ ModuleVector::iterator begin = Modules.begin();
+ ModuleVector::iterator end = Modules.end();
+ ModuleVector::iterator it;
+ for (it = begin; it != end; ++it)
+ (*it)->dump();
+}
//===----------------------------------------------------------------------===//
// Code Generation
//===----------------------------------------------------------------------===//
-static Module *TheModule;
+static MCJITHelper *JITHelper;
static IRBuilder<> Builder(getGlobalContext());
static std::map<std::string, Value *> NamedValues;
-static FunctionPassManager *TheFPM;
Value *ErrorV(const char *Str) {
Error(Str);
Value *CallExprAST::Codegen() {
// Look up the name in the global module table.
- Function *CalleeF = TheModule->getFunction(Callee);
+ Function *CalleeF = JITHelper->getFunction(Callee);
if (CalleeF == 0)
return ErrorV("Unknown function referenced");
FunctionType *FT =
FunctionType::get(Type::getDoubleTy(getGlobalContext()), Doubles, false);
+ std::string FnName = MakeLegalFunctionName(Name);
+
+ Module *M = JITHelper->getModuleForNewFunction();
+
Function *F =
- Function::Create(FT, Function::ExternalLinkage, Name, TheModule);
+ Function::Create(FT, Function::ExternalLinkage, FnName, M);
// If F conflicted, there was already something named 'Name'. If it has a
// body, don't allow redefinition or reextern.
- if (F->getName() != Name) {
+ if (F->getName() != FnName) {
// Delete the one we just made and get the existing one.
F->eraseFromParent();
- F = TheModule->getFunction(Name);
-
+ F = JITHelper->getFunction(Name);
// If F already has a body, reject this.
if (!F->empty()) {
ErrorF("redefinition of function");
// Validate the generated code, checking for consistency.
verifyFunction(*TheFunction);
- // Optimize the function.
- TheFPM->run(*TheFunction);
-
return TheFunction;
}
// Top-Level parsing and JIT Driver
//===----------------------------------------------------------------------===//
-static ExecutionEngine *TheExecutionEngine;
-
static void HandleDefinition() {
if (FunctionAST *F = ParseDefinition()) {
if (Function *LF = F->Codegen()) {
// Evaluate a top-level expression into an anonymous function.
if (FunctionAST *F = ParseTopLevelExpr()) {
if (Function *LF = F->Codegen()) {
- TheExecutionEngine->finalizeObject();
// JIT the function, returning a function pointer.
- void *FPtr = TheExecutionEngine->getPointerToFunction(LF);
+ void *FPtr = JITHelper->getPointerToFunction(LF);
// Cast it to the right type (takes no arguments, returns a double) so we
// can call it as a native function.
InitializeNativeTargetAsmPrinter();
InitializeNativeTargetAsmParser();
LLVMContext &Context = getGlobalContext();
+ JITHelper = new MCJITHelper(Context);
// Install standard binary operators.
// 1 is lowest precedence.
fprintf(stderr, "ready> ");
getNextToken();
- // Make the module, which holds all the code.
- std::unique_ptr<Module> Owner = make_unique<Module>("my cool jit", Context);
- TheModule = Owner.get();
-
- // Create the JIT. This takes ownership of the module.
- std::string ErrStr;
- TheExecutionEngine =
- EngineBuilder(std::move(Owner))
- .setErrorStr(&ErrStr)
- .setMCJITMemoryManager(llvm::make_unique<SectionMemoryManager>())
- .create();
- if (!TheExecutionEngine) {
- fprintf(stderr, "Could not create ExecutionEngine: %s\n", ErrStr.c_str());
- exit(1);
- }
-
- FunctionPassManager OurFPM(TheModule);
-
- // Set up the optimizer pipeline. Start with registering info about how the
- // target lays out data structures.
- TheModule->setDataLayout(TheExecutionEngine->getDataLayout());
- OurFPM.add(new DataLayoutPass());
- // Provide basic AliasAnalysis support for GVN.
- OurFPM.add(createBasicAliasAnalysisPass());
- // Do simple "peephole" optimizations and bit-twiddling optzns.
- OurFPM.add(createInstructionCombiningPass());
- // Reassociate expressions.
- OurFPM.add(createReassociatePass());
- // Eliminate Common SubExpressions.
- OurFPM.add(createGVNPass());
- // Simplify the control flow graph (deleting unreachable blocks, etc).
- OurFPM.add(createCFGSimplificationPass());
-
- OurFPM.doInitialization();
-
- // Set the global so the code gen can use this.
- TheFPM = &OurFPM;
-
// Run the main "interpreter loop" now.
MainLoop();
- TheFPM = 0;
-
// Print out all of the generated code.
- TheModule->dump();
+ JITHelper->dump();
return 0;
}
projects / llvm / commitdiff