Interpreter.cpp revision 56adf152f6354a9b5609e059050fd2315ad5960c 
1//===- Interpreter.cpp - Top-Level LLVM Interpreter Implementation --------===//
2//
3// This file implements the top-level functionality for the LLVM interpreter.
4// This interpreter is designed to be a very simple, portable, inefficient
5// interpreter.
6//
7//===----------------------------------------------------------------------===//
8
9#include "Interpreter.h"
10#include "llvm/Target/TargetMachineImpls.h"
11
12/// createInterpreter - Create a new interpreter object.  This can never fail.
13///
14ExecutionEngine *ExecutionEngine::createInterpreter(Module *M,
15						    unsigned Config,
16						    bool DebugMode,
17						    bool TraceMode) {
18  return new Interpreter(M, Config, DebugMode, TraceMode);
19}
20
21//===----------------------------------------------------------------------===//
22// Interpreter ctor - Initialize stuff
23//
24Interpreter::Interpreter(Module *M, unsigned Config,
25			 bool DebugMode, bool TraceMode)
26  : ExecutionEngine(M), ExitCode(0), Debug(DebugMode), Trace(TraceMode),
27    CurFrame(-1), TD("lli", (Config & TM::EndianMask) == TM::LittleEndian,
28		     (Config & TM::PtrSizeMask) == TM::PtrSize64 ? 8 : 4,
29		     (Config & TM::PtrSizeMask) == TM::PtrSize64 ? 8 : 4,
30		     (Config & TM::PtrSizeMask) == TM::PtrSize64 ? 8 : 4) {
31
32  setTargetData(TD);
33  // Initialize the "backend"
34  initializeExecutionEngine();
35  initializeExternalFunctions();
36  CW.setModule(M);  // Update Writer
37  emitGlobals();
38}
39
40/// run - Start execution with the specified function and arguments.
41///
42int Interpreter::run(const std::string &MainFunction,
43		     const std::vector<std::string> &Args) {
44  // Start interpreter into the main function...
45  //
46  if (!callMainFunction(MainFunction, Args) && !Debug) {
47    // If not in debug mode and if the call succeeded, run the code now...
48    run();
49  }
50
51  // If debug mode, allow the user to interact... also, if the user pressed
52  // ctrl-c or execution hit an error, enter the event loop...
53  if (Debug || isStopped())
54    handleUserInput();
55  return ExitCode;
56}
57
58