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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
//===- Interpreter.cpp - Top-Level LLVM Interpreter Implementation --------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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/IR/DerivedTypes.h"
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#include "llvm/IR/Module.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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extern "C" void LLVMLinkInInterpreter() { }
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/// Create a new interpreter object.
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///
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ExecutionEngine *Interpreter::create(std::unique_ptr<Module> M,
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std::string *ErrStr) {
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// Tell this Module to materialize everything and release the GVMaterializer.
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if (Error Err = M->materializeAll()) {
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std::string Msg;
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handleAllErrors(std::move(Err), [&](ErrorInfoBase &EIB) {
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Msg = EIB.message();
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});
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if (ErrStr)
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*ErrStr = Msg;
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// We got an error, just return 0
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return nullptr;
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}
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return new Interpreter(std::move(M));
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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(std::unique_ptr<Module> M)
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: ExecutionEngine(std::move(M)) {
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memset(&ExitValue.Untyped, 0, sizeof(ExitValue.Untyped));
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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(getDataLayout());
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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(), None);
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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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ArrayRef<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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const size_t ArgCount = F->getFunctionType()->getNumParams();
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ArrayRef<GenericValue> ActualArgs =
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ArgValues.slice(0, std::min(ArgValues.size(), ArgCount));
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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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