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https://github.com/c64scene-ar/llvm-6502.git
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e02fce0ac9
Summary: This change is part of a series of commits dedicated to have a single DataLayout during compilation by using always the one owned by the module. The ExecutionEngine will act as an exception and will be unsafe to be reused across context. We don't enforce this rule but undefined behavior can occurs if the user tries to do it. Reviewers: lhames Subscribers: echristo, llvm-commits, rafael, yaron.keren Differential Revision: http://reviews.llvm.org/D11110 From: Mehdi Amini <mehdi.amini@apple.com> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242414 91177308-0d34-0410-b5e6-96231b3b80d8
100 lines
2.9 KiB
C++
100 lines
2.9 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/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 (std::error_code EC = M->materializeAllPermanently()) {
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if (ErrStr)
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*ErrStr = EC.message();
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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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