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"
26 static struct RegisterInterp {
27 RegisterInterp() { Interpreter::Register(); }
32 extern "C" void LLVMLinkInInterpreter() { }
34 /// create - Create a new interpreter object. This can never fail.
36 ExecutionEngine *Interpreter::create(ModuleProvider *MP, std::string* ErrStr,
37 CodeGenOpt::Level OptLevel /*unused*/) {
38 // Tell this ModuleProvide to materialize and release the module
39 if (!MP->materializeModule(ErrStr))
40 // We got an error, just return 0
43 return new Interpreter(MP);
46 //===----------------------------------------------------------------------===//
47 // Interpreter ctor - Initialize stuff
49 Interpreter::Interpreter(ModuleProvider *M)
50 : ExecutionEngine(M), TD(M->getModule()) {
52 memset(&ExitValue.Untyped, 0, sizeof(ExitValue.Untyped));
54 // Initialize the "backend"
55 initializeExecutionEngine();
56 initializeExternalFunctions();
59 IL = new IntrinsicLowering(TD);
62 Interpreter::~Interpreter() {
66 void Interpreter::runAtExitHandlers () {
67 while (!AtExitHandlers.empty()) {
68 callFunction(AtExitHandlers.back(), std::vector<GenericValue>());
69 AtExitHandlers.pop_back();
74 /// run - Start execution with the specified function and arguments.
77 Interpreter::runFunction(Function *F,
78 const std::vector<GenericValue> &ArgValues) {
79 assert (F && "Function *F was null at entry to run()");
81 // Try extra hard not to pass extra args to a function that isn't
82 // expecting them. C programmers frequently bend the rules and
83 // declare main() with fewer parameters than it actually gets
84 // passed, and the interpreter barfs if you pass a function more
85 // parameters than it is declared to take. This does not attempt to
86 // take into account gratuitous differences in declared types,
88 std::vector<GenericValue> ActualArgs;
89 const unsigned ArgCount = F->getFunctionType()->getNumParams();
90 for (unsigned i = 0; i < ArgCount; ++i)
91 ActualArgs.push_back(ArgValues[i]);
93 // Set up the function call.
94 callFunction(F, ActualArgs);
96 // Start executing the function.