1 //===- Interpreter.cpp - Top-Level LLVM Interpreter Implementation --------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the top-level functionality for the LLVM interpreter.
11 // This interpreter is designed to be a very simple, portable, inefficient
14 //===----------------------------------------------------------------------===//
16 #include "Interpreter.h"
17 #include "llvm/CodeGen/IntrinsicLowering.h"
18 #include "llvm/DerivedTypes.h"
19 #include "llvm/Module.h"
20 #include "llvm/ModuleProvider.h"
24 static struct RegisterInterp {
25 RegisterInterp() { Interpreter::Register(); }
29 void LinkInInterpreter() {
33 /// create - Create a new interpreter object. This can never fail.
35 ExecutionEngine *Interpreter::create(ModuleProvider *MP, std::string* ErrStr) {
36 // Tell this ModuleProvide to materialize and release the module
37 if (!MP->materializeModule(ErrStr))
38 // We got an error, just return 0
41 return new Interpreter(MP);
44 //===----------------------------------------------------------------------===//
45 // Interpreter ctor - Initialize stuff
47 Interpreter::Interpreter(ModuleProvider *M)
48 : ExecutionEngine(M), TD(M->getModule()) {
50 memset(&ExitValue.Untyped, 0, sizeof(ExitValue.Untyped));
52 // Initialize the "backend"
53 initializeExecutionEngine();
54 initializeExternalFunctions();
57 IL = new IntrinsicLowering(TD);
60 Interpreter::~Interpreter() {
64 void Interpreter::runAtExitHandlers () {
65 while (!AtExitHandlers.empty()) {
66 callFunction(AtExitHandlers.back(), std::vector<GenericValue>());
67 AtExitHandlers.pop_back();
72 /// run - Start execution with the specified function and arguments.
75 Interpreter::runFunction(Function *F,
76 const std::vector<GenericValue> &ArgValues) {
77 assert (F && "Function *F was null at entry to run()");
79 // Try extra hard not to pass extra args to a function that isn't
80 // expecting them. C programmers frequently bend the rules and
81 // declare main() with fewer parameters than it actually gets
82 // passed, and the interpreter barfs if you pass a function more
83 // parameters than it is declared to take. This does not attempt to
84 // take into account gratuitous differences in declared types,
86 std::vector<GenericValue> ActualArgs;
87 const unsigned ArgCount = F->getFunctionType()->getNumParams();
88 for (unsigned i = 0; i < ArgCount; ++i)
89 ActualArgs.push_back(ArgValues[i]);
91 // Set up the function call.
92 callFunction(F, ActualArgs);
94 // Start executing the function.