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107 lines
3.4 KiB
C++
107 lines
3.4 KiB
C++
//===- Interpreter.cpp - Top-Level LLVM Interpreter Implementation --------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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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/IntrinsicLowering.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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using namespace llvm;
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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, IntrinsicLowering *IL) {
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bool isLittleEndian = false;
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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 = false;
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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, IL);
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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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IntrinsicLowering *il)
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: ExecutionEngine(M), ExitCode(0),
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TD("lli", isLittleEndian, isLongPointer ? 8 : 4, isLongPointer ? 8 : 4,
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isLongPointer ? 8 : 4), IL(il) {
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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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emitGlobals();
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if (IL == 0) IL = new DefaultIntrinsicLowering();
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}
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Interpreter::~Interpreter() {
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delete IL;
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}
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void Interpreter::runAtExitHandlers () {
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while (!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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}
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/// run - Start execution with the specified function and arguments.
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///
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GenericValue Interpreter::runFunction(Function *F,
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const std::vector<GenericValue> &ArgValues) {
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assert (F && "Function *F was null at entry to run()");
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// Try extra hard not to pass extra args to a function that isn't
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// expecting them. C programmers frequently bend the rules and
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// declare main() with fewer parameters than it actually gets
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// passed, and the interpreter barfs if you pass a function more
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// parameters than it is declared to take. This does not attempt to
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// take into account gratuitous differences in declared types,
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// though.
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std::vector<GenericValue> ActualArgs;
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const unsigned ArgCount = F->getFunctionType()->getParamTypes().size();
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for (unsigned i = 0; i < ArgCount; ++i)
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ActualArgs.push_back (ArgValues[i]);
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// Set up the function call.
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callFunction(F, ActualArgs);
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// Start executing the function.
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run();
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GenericValue rv;
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rv.IntVal = ExitCode;
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return rv;
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}
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