mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-09 10:29:21 +00:00
f58815e161
Get rid of support for DebugMode (make it always off). Mung some comments. Get rid of interpreter's PROFILE_STRUCTURE_FIELDS and PerformExitStuff which have been disabled forever. Get rid of -abort-on-exception (make it always on). Get rid of user interaction stuff (debug mode innards). Simplify Interpreter's callMainFunction(). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8344 91177308-0d34-0410-b5e6-96231b3b80d8
79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
//===- Interpreter.cpp - Top-Level LLVM Interpreter Implementation --------===//
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//
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// This file implements the top-level functionality for the LLVM interpreter.
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// This interpreter is designed to be a very simple, portable, inefficient
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// interpreter.
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//
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//===----------------------------------------------------------------------===//
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#include "Interpreter.h"
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#include "llvm/Module.h"
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/// create - Create a new interpreter object. This can never fail.
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///
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ExecutionEngine *Interpreter::create(Module *M, bool TraceMode){
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bool isLittleEndian;
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switch (M->getEndianness()) {
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case Module::LittleEndian: isLittleEndian = true; break;
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case Module::BigEndian: isLittleEndian = false; break;
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case Module::AnyPointerSize:
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int Test = 0;
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*(char*)&Test = 1; // Return true if the host is little endian
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isLittleEndian = (Test == 1);
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break;
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}
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bool isLongPointer;
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switch (M->getPointerSize()) {
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case Module::Pointer32: isLongPointer = false; break;
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case Module::Pointer64: isLongPointer = true; break;
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case Module::AnyPointerSize:
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isLongPointer = (sizeof(void*) == 8); // Follow host
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break;
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}
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return new Interpreter(M, isLittleEndian, isLongPointer, TraceMode);
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}
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//===----------------------------------------------------------------------===//
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// Interpreter ctor - Initialize stuff
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//
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Interpreter::Interpreter(Module *M, bool isLittleEndian, bool isLongPointer,
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bool TraceMode)
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: ExecutionEngine(M), ExitCode(0), Trace(TraceMode),
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CurFrame(-1), TD("lli", isLittleEndian, isLongPointer ? 8 : 4,
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isLongPointer ? 8 : 4, isLongPointer ? 8 : 4) {
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setTargetData(TD);
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// Initialize the "backend"
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initializeExecutionEngine();
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initializeExternalFunctions();
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CW.setModule(M); // Update Writer
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emitGlobals();
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}
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/// run - Start execution with the specified function and arguments.
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///
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int Interpreter::run(const std::string &MainFunction,
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const std::vector<std::string> &Args,
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const char ** envp) {
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// Start interpreter into the main function...
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//
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if (!callMainFunction(MainFunction, Args)) {
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// If the call succeeded, run the code now...
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run();
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}
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do {
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// If the program has exited, run atexit handlers...
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if (ECStack.empty() && !AtExitHandlers.empty()) {
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callFunction(AtExitHandlers.back(), std::vector<GenericValue>());
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AtExitHandlers.pop_back();
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run();
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}
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} while (!ECStack.empty());
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return ExitCode;
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}
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