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+//===- Interpreter.cpp - Top-Level LLVM Interpreter Implementation --------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the top-level functionality for the LLVM interpreter.
+// This interpreter is designed to be a very simple, portable, inefficient
+// interpreter.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Interpreter.h"
+#include "llvm/CodeGen/IntrinsicLowering.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/Module.h"
+#include <cstring>
+using namespace llvm;
+
+namespace {
+
+static struct RegisterInterp {
+ RegisterInterp() { Interpreter::Register(); }
+} InterpRegistrator;
+
+}
+
+extern "C" void LLVMLinkInInterpreter() { }
+
+/// Create a new interpreter object.
+///
+ExecutionEngine *Interpreter::create(std::unique_ptr<Module> M,
+ std::string *ErrStr) {
+ // Tell this Module to materialize everything and release the GVMaterializer.
+ if (Error Err = M->materializeAll()) {
+ std::string Msg;
+ handleAllErrors(std::move(Err), [&](ErrorInfoBase &EIB) {
+ Msg = EIB.message();
+ });
+ if (ErrStr)
+ *ErrStr = Msg;
+ // We got an error, just return 0
+ return nullptr;
+ }
+
+ return new Interpreter(std::move(M));
+}
+
+//===----------------------------------------------------------------------===//
+// Interpreter ctor - Initialize stuff
+//
+Interpreter::Interpreter(std::unique_ptr<Module> M)
+ : ExecutionEngine(std::move(M)) {
+
+ memset(&ExitValue.Untyped, 0, sizeof(ExitValue.Untyped));
+ // Initialize the "backend"
+ initializeExecutionEngine();
+ initializeExternalFunctions();
+ emitGlobals();
+
+ IL = new IntrinsicLowering(getDataLayout());
+}
+
+Interpreter::~Interpreter() {
+ delete IL;
+}
+
+void Interpreter::runAtExitHandlers () {
+ while (!AtExitHandlers.empty()) {
+ callFunction(AtExitHandlers.back(), std::nullopt);
+ AtExitHandlers.pop_back();
+ run();
+ }
+}
+
+/// run - Start execution with the specified function and arguments.
+///
+GenericValue Interpreter::runFunction(Function *F,
+ ArrayRef<GenericValue> ArgValues) {
+ assert (F && "Function *F was null at entry to run()");
+
+ // Try extra hard not to pass extra args to a function that isn't
+ // expecting them. C programmers frequently bend the rules and
+ // declare main() with fewer parameters than it actually gets
+ // passed, and the interpreter barfs if you pass a function more
+ // parameters than it is declared to take. This does not attempt to
+ // take into account gratuitous differences in declared types,
+ // though.
+ const size_t ArgCount = F->getFunctionType()->getNumParams();
+ ArrayRef<GenericValue> ActualArgs =
+ ArgValues.slice(0, std::min(ArgValues.size(), ArgCount));
+
+ // Set up the function call.
+ callFunction(F, ActualArgs);
+
+ // Start executing the function.
+ run();
+
+ return ExitValue;
+}