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