Merge branch 'master' into msp430
[llvm/msp430.git] / lib / ExecutionEngine / Interpreter / Interpreter.cpp
blobded65d5467017eeb39f09f8987627d7992048151
1 //===- Interpreter.cpp - Top-Level LLVM Interpreter Implementation --------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the top-level functionality for the LLVM interpreter.
11 // This interpreter is designed to be a very simple, portable, inefficient
12 // interpreter.
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"
21 #include <cstring>
22 using namespace llvm;
24 namespace {
26 static struct RegisterInterp {
27 RegisterInterp() { Interpreter::Register(); }
28 } InterpRegistrator;
32 namespace llvm {
33 void LinkInInterpreter() {
37 /// create - Create a new interpreter object. This can never fail.
38 ///
39 ExecutionEngine *Interpreter::create(ModuleProvider *MP, std::string* ErrStr,
40 CodeGenOpt::Level OptLevel /*unused*/) {
41 // Tell this ModuleProvide to materialize and release the module
42 if (!MP->materializeModule(ErrStr))
43 // We got an error, just return 0
44 return 0;
46 return new Interpreter(MP);
49 //===----------------------------------------------------------------------===//
50 // Interpreter ctor - Initialize stuff
52 Interpreter::Interpreter(ModuleProvider *M)
53 : ExecutionEngine(M), TD(M->getModule()) {
55 memset(&ExitValue.Untyped, 0, sizeof(ExitValue.Untyped));
56 setTargetData(&TD);
57 // Initialize the "backend"
58 initializeExecutionEngine();
59 initializeExternalFunctions();
60 emitGlobals();
62 IL = new IntrinsicLowering(TD);
65 Interpreter::~Interpreter() {
66 delete IL;
69 void Interpreter::runAtExitHandlers () {
70 while (!AtExitHandlers.empty()) {
71 callFunction(AtExitHandlers.back(), std::vector<GenericValue>());
72 AtExitHandlers.pop_back();
73 run();
77 /// run - Start execution with the specified function and arguments.
78 ///
79 GenericValue
80 Interpreter::runFunction(Function *F,
81 const std::vector<GenericValue> &ArgValues) {
82 assert (F && "Function *F was null at entry to run()");
84 // Try extra hard not to pass extra args to a function that isn't
85 // expecting them. C programmers frequently bend the rules and
86 // declare main() with fewer parameters than it actually gets
87 // passed, and the interpreter barfs if you pass a function more
88 // parameters than it is declared to take. This does not attempt to
89 // take into account gratuitous differences in declared types,
90 // though.
91 std::vector<GenericValue> ActualArgs;
92 const unsigned ArgCount = F->getFunctionType()->getNumParams();
93 for (unsigned i = 0; i < ArgCount; ++i)
94 ActualArgs.push_back(ArgValues[i]);
96 // Set up the function call.
97 callFunction(F, ActualArgs);
99 // Start executing the function.
100 run();
102 return ExitValue;