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https://github.com/c64scene-ar/llvm-6502.git
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api's look like this: ModuleProvider *getBytecodeModuleProvider( const std::string &Filename, ///< Name of file to be read BCDecompressor_t *BCDC = Compressor::decompressToNewBuffer, std::string* ErrMsg = 0, ///< Optional error message holder BytecodeHandler* H = 0 ///< Optional handler for reader events ); This is ugly, but allows a client to say: getBytecodeModuleProvider("foo", 0); If they do this, there is no dependency on the compression libraries, saving codesize. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34012 91177308-0d34-0410-b5e6-96231b3b80d8
147 lines
5.3 KiB
C++
147 lines
5.3 KiB
C++
//===- lli.cpp - LLVM Interpreter / Dynamic compiler ----------------------===//
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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 utility provides a simple wrapper around the LLVM Execution Engines,
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// which allow the direct execution of LLVM programs through a Just-In-Time
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// compiler, or through an intepreter if no JIT is available for this platform.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Module.h"
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#include "llvm/ModuleProvider.h"
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#include "llvm/Type.h"
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/CodeGen/LinkAllCodegenComponents.h"
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#include "llvm/ExecutionEngine/JIT.h"
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#include "llvm/ExecutionEngine/Interpreter.h"
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#include "llvm/ExecutionEngine/GenericValue.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Compressor.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/PluginLoader.h"
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#include "llvm/System/Process.h"
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#include "llvm/System/Signals.h"
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#include <iostream>
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using namespace llvm;
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namespace {
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cl::opt<std::string>
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InputFile(cl::desc("<input bytecode>"), cl::Positional, cl::init("-"));
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cl::list<std::string>
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InputArgv(cl::ConsumeAfter, cl::desc("<program arguments>..."));
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cl::opt<bool> ForceInterpreter("force-interpreter",
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cl::desc("Force interpretation: disable JIT"),
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cl::init(false));
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cl::opt<std::string>
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TargetTriple("mtriple", cl::desc("Override target triple for module"));
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cl::opt<std::string>
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FakeArgv0("fake-argv0",
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cl::desc("Override the 'argv[0]' value passed into the executing"
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" program"), cl::value_desc("executable"));
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cl::opt<bool>
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DisableCoreFiles("disable-core-files", cl::Hidden,
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cl::desc("Disable emission of core files if possible"));
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}
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//===----------------------------------------------------------------------===//
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// main Driver function
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//
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int main(int argc, char **argv, char * const *envp) {
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atexit(llvm_shutdown); // Call llvm_shutdown() on exit.
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try {
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cl::ParseCommandLineOptions(argc, argv,
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" llvm interpreter & dynamic compiler\n");
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sys::PrintStackTraceOnErrorSignal();
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// If the user doesn't want core files, disable them.
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if (DisableCoreFiles)
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sys::Process::PreventCoreFiles();
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// Load the bytecode...
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std::string ErrorMsg;
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ModuleProvider *MP = 0;
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MP = getBytecodeModuleProvider(InputFile,
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Compressor::decompressToNewBuffer,
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&ErrorMsg);
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if (!MP) {
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std::cerr << "Error loading program '" << InputFile << "': "
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<< ErrorMsg << "\n";
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exit(1);
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}
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// If we are supposed to override the target triple, do so now.
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if (!TargetTriple.empty())
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MP->getModule()->setTargetTriple(TargetTriple);
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ExecutionEngine *EE = ExecutionEngine::create(MP, ForceInterpreter);
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assert(EE &&"Couldn't create an ExecutionEngine, not even an interpreter?");
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// If the user specifically requested an argv[0] to pass into the program,
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// do it now.
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if (!FakeArgv0.empty()) {
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InputFile = FakeArgv0;
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} else {
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// Otherwise, if there is a .bc suffix on the executable strip it off, it
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// might confuse the program.
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if (InputFile.rfind(".bc") == InputFile.length() - 3)
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InputFile.erase(InputFile.length() - 3);
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}
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// Add the module's name to the start of the vector of arguments to main().
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InputArgv.insert(InputArgv.begin(), InputFile);
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// Call the main function from M as if its signature were:
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// int main (int argc, char **argv, const char **envp)
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// using the contents of Args to determine argc & argv, and the contents of
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// EnvVars to determine envp.
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//
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Function *Fn = MP->getModule()->getFunction("main");
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if (!Fn) {
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std::cerr << "'main' function not found in module.\n";
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return -1;
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}
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// Run static constructors.
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EE->runStaticConstructorsDestructors(false);
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// Run main.
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int Result = EE->runFunctionAsMain(Fn, InputArgv, envp);
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// Run static destructors.
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EE->runStaticConstructorsDestructors(true);
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// If the program didn't explicitly call exit, call exit now, for the
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// program. This ensures that any atexit handlers get called correctly.
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Constant *Exit = MP->getModule()->getOrInsertFunction("exit", Type::VoidTy,
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Type::Int32Ty, NULL);
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if (Function *ExitF = dyn_cast<Function>(Exit)) {
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std::vector<GenericValue> Args;
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GenericValue ResultGV;
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ResultGV.Int32Val = Result;
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Args.push_back(ResultGV);
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EE->runFunction(ExitF, Args);
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std::cerr << "ERROR: exit(" << Result << ") returned!\n";
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abort();
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} else {
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std::cerr << "ERROR: exit defined with wrong prototype!\n";
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abort();
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}
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} catch (const std::string& msg) {
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std::cerr << argv[0] << ": " << msg << "\n";
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} catch (...) {
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std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
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}
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abort();
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}
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