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 bool GVsWithCode /* unused */) {
39 // Tell this ModuleProvide to materialize and release the module
40 if (!MP->materializeModule(ErrStr))
41 // We got an error, just return 0
44 return new Interpreter(MP);
47 //===----------------------------------------------------------------------===//
48 // Interpreter ctor - Initialize stuff
50 Interpreter::Interpreter(ModuleProvider *M)
51 : ExecutionEngine(M), TD(M->getModule()) {
53 memset(&ExitValue.Untyped, 0, sizeof(ExitValue.Untyped));
55 // Initialize the "backend"
56 initializeExecutionEngine();
57 initializeExternalFunctions();
60 IL = new IntrinsicLowering(TD);
63 Interpreter::~Interpreter() {
67 void Interpreter::runAtExitHandlers () {
68 while (!AtExitHandlers.empty()) {
69 callFunction(AtExitHandlers.back(), std::vector<GenericValue>());
70 AtExitHandlers.pop_back();
75 /// run - Start execution with the specified function and arguments.
78 Interpreter::runFunction(Function *F,
79 const std::vector<GenericValue> &ArgValues) {
80 assert (F && "Function *F was null at entry to run()");
82 // Try extra hard not to pass extra args to a function that isn't
83 // expecting them. C programmers frequently bend the rules and
84 // declare main() with fewer parameters than it actually gets
85 // passed, and the interpreter barfs if you pass a function more
86 // parameters than it is declared to take. This does not attempt to
87 // take into account gratuitous differences in declared types,
89 std::vector<GenericValue> ActualArgs;
90 const unsigned ArgCount = F->getFunctionType()->getNumParams();
91 for (unsigned i = 0; i < ArgCount; ++i)
92 ActualArgs.push_back(ArgValues[i]);
94 // Set up the function call.
95 callFunction(F, ActualArgs);
97 // Start executing the function.