Interpreter.cpp revision 203954
172132Ssemenu//===- Interpreter.cpp - Top-Level LLVM Interpreter Implementation --------===// 272132Ssemenu// 372132Ssemenu// The LLVM Compiler Infrastructure 472132Ssemenu// 572132Ssemenu// This file is distributed under the University of Illinois Open Source 672132Ssemenu// License. See LICENSE.TXT for details. 772132Ssemenu// 872132Ssemenu//===----------------------------------------------------------------------===// 972132Ssemenu// 1072132Ssemenu// This file implements the top-level functionality for the LLVM interpreter. 1172132Ssemenu// This interpreter is designed to be a very simple, portable, inefficient 1272132Ssemenu// interpreter. 1372132Ssemenu// 1472132Ssemenu//===----------------------------------------------------------------------===// 1572132Ssemenu 1672132Ssemenu#include "Interpreter.h" 1772132Ssemenu#include "llvm/CodeGen/IntrinsicLowering.h" 1872132Ssemenu#include "llvm/DerivedTypes.h" 1972132Ssemenu#include "llvm/Module.h" 2072132Ssemenu#include <cstring> 2172132Ssemenuusing namespace llvm; 2272132Ssemenu 2372132Ssemenunamespace { 2472132Ssemenu 2572132Ssemenustatic struct RegisterInterp { 2672132Ssemenu RegisterInterp() { Interpreter::Register(); } 2772132Ssemenu} InterpRegistrator; 2872132Ssemenu 2972132Ssemenu} 3072132Ssemenu 3172132Ssemenuextern "C" void LLVMLinkInInterpreter() { } 3272132Ssemenu 3372132Ssemenu/// create - Create a new interpreter object. This can never fail. 3472132Ssemenu/// 3572132SsemenuExecutionEngine *Interpreter::create(Module *M, std::string* ErrStr) { 3672132Ssemenu // Tell this Module to materialize everything and release the GVMaterializer. 3772132Ssemenu if (M->MaterializeAllPermanently(ErrStr)) 3872132Ssemenu // We got an error, just return 0 3972132Ssemenu return 0; 4072132Ssemenu 4172132Ssemenu return new Interpreter(M); 4272132Ssemenu} 4372132Ssemenu 4472132Ssemenu//===----------------------------------------------------------------------===// 4572132Ssemenu// Interpreter ctor - Initialize stuff 4672132Ssemenu// 4772132SsemenuInterpreter::Interpreter(Module *M) 4872132Ssemenu : ExecutionEngine(M), TD(M) { 4972132Ssemenu 5072132Ssemenu memset(&ExitValue.Untyped, 0, sizeof(ExitValue.Untyped)); 5172132Ssemenu setTargetData(&TD); 5272132Ssemenu // Initialize the "backend" 5372132Ssemenu initializeExecutionEngine(); 5472132Ssemenu initializeExternalFunctions(); 5572132Ssemenu emitGlobals(); 5672132Ssemenu 5772132Ssemenu IL = new IntrinsicLowering(TD); 5872132Ssemenu} 5972132Ssemenu 6072132SsemenuInterpreter::~Interpreter() { 6172132Ssemenu delete IL; 6272132Ssemenu} 6372132Ssemenu 6472132Ssemenuvoid Interpreter::runAtExitHandlers () { 6572132Ssemenu while (!AtExitHandlers.empty()) { 6672132Ssemenu callFunction(AtExitHandlers.back(), std::vector<GenericValue>()); 6772132Ssemenu AtExitHandlers.pop_back(); 6872132Ssemenu run(); 6972132Ssemenu } 7072132Ssemenu} 7172132Ssemenu 7272132Ssemenu/// run - Start execution with the specified function and arguments. 7372132Ssemenu/// 7472132SsemenuGenericValue 7572132SsemenuInterpreter::runFunction(Function *F, 7672132Ssemenu const std::vector<GenericValue> &ArgValues) { 7772132Ssemenu assert (F && "Function *F was null at entry to run()"); 7872132Ssemenu 7972132Ssemenu // Try extra hard not to pass extra args to a function that isn't 8072132Ssemenu // expecting them. C programmers frequently bend the rules and 8172132Ssemenu // declare main() with fewer parameters than it actually gets 8272132Ssemenu // passed, and the interpreter barfs if you pass a function more 8372132Ssemenu // parameters than it is declared to take. This does not attempt to 8472132Ssemenu // take into account gratuitous differences in declared types, 8572132Ssemenu // though. 8672132Ssemenu std::vector<GenericValue> ActualArgs; 8772132Ssemenu const unsigned ArgCount = F->getFunctionType()->getNumParams(); 8872132Ssemenu for (unsigned i = 0; i < ArgCount; ++i) 8972132Ssemenu ActualArgs.push_back(ArgValues[i]); 9072132Ssemenu 9172132Ssemenu // Set up the function call. 9272132Ssemenu callFunction(F, ActualArgs); 9372132Ssemenu 9472132Ssemenu // Start executing the function. 9592739Salfred run(); 9692739Salfred 9772132Ssemenu return ExitValue; 9872132Ssemenu} 9972132Ssemenu