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https://github.com/c64scene-ar/llvm-6502.git
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fe11a97fcd
the traditional LLI interpreter git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5125 91177308-0d34-0410-b5e6-96231b3b80d8
102 lines
3.3 KiB
C++
102 lines
3.3 KiB
C++
//===- lli.cpp - LLVM Interpreter / Dynamic compiler ----------------------===//
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//
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// This utility provides a way to execute LLVM bytecode without static
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// compilation. This consists of a very simple and slow (but portable)
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// interpreter, along with capability for system specific dynamic compilers. At
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// runtime, the fastest (stable) execution engine is selected to run the
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// program. This means the JIT compiler for the current platform if it's
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// available.
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//
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//===----------------------------------------------------------------------===//
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#include "ExecutionEngine.h"
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#include "Support/CommandLine.h"
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/Module.h"
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#include "llvm/Target/TargetMachineImpls.h"
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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<std::string>
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MainFunction ("f", cl::desc("Function to execute"), cl::init("main"),
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cl::value_desc("function name"));
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cl::opt<bool> DebugMode("d", cl::desc("Start program in debugger"));
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cl::opt<bool> TraceMode("trace", cl::desc("Enable Tracing"));
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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(true));
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}
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//===----------------------------------------------------------------------===//
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// ExecutionEngine Class Implementation
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//
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ExecutionEngine::~ExecutionEngine() {
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delete &CurMod;
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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) {
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cl::ParseCommandLineOptions(argc, argv,
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" llvm interpreter & dynamic compiler\n");
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// Load the bytecode...
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string ErrorMsg;
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Module *M = ParseBytecodeFile(InputFile, &ErrorMsg);
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if (M == 0) {
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cout << "Error parsing '" << InputFile << "': "
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<< ErrorMsg << "\n";
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exit(1);
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}
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#if 0
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// Link in the runtime library for LLI...
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string RuntimeLib = getCurrentExecutablePath();
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if (!RuntimeLib.empty()) RuntimeLib += "/";
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RuntimeLib += "RuntimeLib.bc";
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if (Module *SupportLib = ParseBytecodeFile(RuntimeLib, &ErrorMsg)) {
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if (LinkModules(M, SupportLib, &ErrorMsg))
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std::cerr << "Error Linking runtime library into current module: "
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<< ErrorMsg << "\n";
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} else {
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std::cerr << "Error loading runtime library '"+RuntimeLib+"': "
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<< ErrorMsg << "\n";
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}
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#endif
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// FIXME: This should look at the PointerSize and endianness of the bytecode
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// file to determine the endianness and pointer size of target machine to use.
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unsigned Config = TM::PtrSize64 | TM::BigEndian;
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ExecutionEngine *EE = 0;
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// If there is nothing that is forcing us to use the interpreter, make a JIT.
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if (!ForceInterpreter && !DebugMode && !TraceMode)
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EE = ExecutionEngine::createJIT(M, Config);
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// If we can't make a JIT, make an interpreter instead.
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if (EE == 0)
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EE = ExecutionEngine::createInterpreter(M, Config, DebugMode, TraceMode);
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// Add the module name to the start of the argv vector...
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InputArgv.insert(InputArgv.begin(), InputFile);
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// Run the main function!
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int ExitCode = EE->run(MainFunction, InputArgv);
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// Now that we are done executing the program, shut down the execution engine
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delete EE;
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return ExitCode;
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}
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