forked from OSchip/llvm-project
105 lines
3.0 KiB
C++
105 lines
3.0 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 is distributed under the University of Illinois Open Source
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// 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/CodeGen/IntrinsicLowering.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/ModuleProvider.h"
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#include <cstring>
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using namespace llvm;
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namespace {
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static struct RegisterInterp {
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RegisterInterp() { Interpreter::Register(); }
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} InterpRegistrator;
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}
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namespace llvm {
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void LinkInInterpreter() {
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}
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}
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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(ModuleProvider *MP, std::string* ErrStr,
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bool Fast /*unused*/) {
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// Tell this ModuleProvide to materialize and release the module
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if (!MP->materializeModule(ErrStr))
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// We got an error, just return 0
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return 0;
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return new Interpreter(MP);
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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(ModuleProvider *M)
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: ExecutionEngine(M), TD(M->getModule()) {
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memset(&ExitValue.Untyped, 0, sizeof(ExitValue.Untyped));
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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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IL = new IntrinsicLowering(TD);
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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
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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()->getNumParams();
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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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return ExitValue;
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}
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