-// $Id$
-//***************************************************************************
-// File:
-// llc.cpp
-//
-// Purpose:
-// Driver for llc compiler.
-//
-// History:
-// 7/15/01 - Vikram Adve - Created
-//
-//**************************************************************************/
+//===-- llc.cpp - Implement the LLVM Compiler -----------------------------===//
+//
+// This is the llc compiler driver.
+//
+//===----------------------------------------------------------------------===//
-#include "llvm/Module.h"
-#include "llvm/Method.h"
#include "llvm/Bytecode/Reader.h"
-#include "llvm/Bytecode/Writer.h"
-#include "llvm/CodeGen/InstrSelection.h"
-#include "llvm/LLC/CompileContext.h"
-#include "llvm/CodeGen/Sparc.h"
-#include "LLCOptions.h"
+#include "llvm/Target/Sparc.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Transforms/Instrumentation/TraceValues.h"
+#include "llvm/Transforms/ChangeAllocations.h"
+#include "llvm/Transforms/HoistPHIConstants.h"
+#include "llvm/Transforms/Scalar/DecomposeMultiDimRefs.h"
+#include "llvm/Assembly/PrintModulePass.h"
+#include "llvm/Bytecode/WriteBytecodePass.h"
+#include "llvm/Transforms/ConstantMerge.h"
+#include "llvm/Module.h"
+#include "llvm/Function.h"
+#include "llvm/PassManager.h"
+#include "Support/CommandLine.h"
+#include "Support/Signals.h"
+#include <memory>
+#include <fstream>
+using std::string;
-CompileContext::~CompileContext() { delete targetMachine; }
+static cl::String InputFilename ("", "Input filename", cl::NoFlags, "-");
+static cl::String OutputFilename("o", "Output filename", cl::NoFlags, "");
+static cl::Flag Force ("f", "Overwrite output files");
+static cl::Flag DumpAsm ("d", "Print bytecode before native code generation", cl::Hidden);
-static bool CompileModule(Module *module, CompileContext& ccontext,
- LLCOptions &Options) {
- bool failed = false;
-
- for (Module::MethodListType::const_iterator
- methodIter = module->getMethodList().begin();
- methodIter != module->getMethodList().end();
- ++methodIter)
- {
- Method* method = *methodIter;
-
- if (SelectInstructionsForMethod(method, ccontext,
- Options.IntOptionValue(DEBUG_INSTR_SELECT_OPT)))
- {
- failed = true;
- cerr << "Instruction selection failed for method "
- << method->getName() << "\n\n";
- }
- }
-
- return failed;
+enum TraceLevel {
+ TraceOff, TraceFunctions, TraceBasicBlocks
+};
+
+static cl::Enum<enum TraceLevel> TraceValues("trace", cl::NoFlags,
+ "Trace values through functions or basic blocks",
+ clEnumValN(TraceOff , "off", "Disable trace code"),
+ clEnumValN(TraceFunctions , "function", "Trace each function"),
+ clEnumValN(TraceBasicBlocks, "basicblock", "Trace each basic block"), 0);
+
+
+// GetFileNameRoot - Helper function to get the basename of a filename...
+static inline string GetFileNameRoot(const string &InputFilename) {
+ string IFN = InputFilename;
+ string outputFilename;
+ int Len = IFN.length();
+ if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
+ outputFilename = string(IFN.begin(), IFN.end()-3); // s/.bc/.s/
+ } else {
+ outputFilename = IFN;
+ }
+ return outputFilename;
}
-//---------------------------------------------------------------------------
+//===---------------------------------------------------------------------===//
// Function main()
//
-// Entry point for the driver.
-//---------------------------------------------------------------------------
+// Entry point for the llc compiler.
+//===---------------------------------------------------------------------===//
+
+int main(int argc, char **argv) {
+ cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
+
+ // Allocate a target... in the future this will be controllable on the
+ // command line.
+ std::auto_ptr<TargetMachine> target(allocateSparcTargetMachine());
+ assert(target.get() && "Could not allocate target machine!");
-int main(int argc, const char** argv, const char** envp) {
- LLCOptions Options(argc, argv, envp);
- CompileContext compileContext(new UltraSparc());
+ TargetMachine &Target = *target.get();
- Module *module = ParseBytecodeFile(Options.getInputFileName());
- if (module == 0) {
+ // Load the module to be compiled...
+ std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
+ if (M.get() == 0) {
cerr << "bytecode didn't read correctly.\n";
return 1;
}
+
+ // Build up all of the passes that we want to do to the module...
+ PassManager Passes;
+
+ // Hoist constants out of PHI nodes into predecessor BB's
+ Passes.add(createHoistPHIConstantsPass());
+
+ if (TraceValues != TraceOff) { // If tracing enabled...
+ // Insert trace code in all functions in the module
+ if (TraceValues == TraceBasicBlocks)
+ Passes.add(createTraceValuesPassForBasicBlocks());
+ else if (TraceValues == TraceFunctions)
+ Passes.add(createTraceValuesPassForFunction());
+ else
+ assert(0 && "Bad value for TraceValues!");
+
+ // Eliminate duplication in constant pool
+ Passes.add(createDynamicConstantMergePass());
+ }
- bool failure = CompileModule(module, compileContext, Options);
+ // Decompose multi-dimensional refs into a sequence of 1D refs
+ Passes.add(createDecomposeMultiDimRefsPass());
- if (failure) {
- cerr << "Error compiling "
- << Options.getInputFileName() << "!\n";
- delete module;
+ // Write out the module with tracing code just before code generation
+ if (TraceValues != TraceOff) { // If tracing enabled...
+ assert(InputFilename != "-" &&
+ "files on stdin not supported with tracing");
+ string traceFileName = GetFileNameRoot(InputFilename) + ".trace.bc";
+
+ if (!Force && std::ifstream(OutputFilename.c_str())) {
+ // If force is not specified, make sure not to overwrite a file!
+ cerr << "Error opening '" << OutputFilename << "': File exists!\n"
+ << "Use -f command line argument to force output\n";
return 1;
}
+
+ std::ostream *os = new std::ofstream(traceFileName.c_str());
+ if (!os->good()) {
+ cerr << "Error opening " << traceFileName
+ << "! SKIPPING OUTPUT OF TRACE CODE\n";
+ delete os;
+ return 1;
+ }
+
+ Passes.add(new WriteBytecodePass(os, true));
+ }
- // Okay, we're done now... write out result...
- // WriteBytecodeToFile(module,
- // compileContext.getOptions().getOutputFileName);
+ // Replace malloc and free instructions with library calls.
+ // Do this after tracing until lli implements these lib calls.
+ // For now, it will emulate malloc and free internally.
+ Passes.add(createLowerAllocationsPass(Target.DataLayout));
- // Clean up and exit
- delete module;
+ // If LLVM dumping after transformations is requested, add it to the pipeline
+ if (DumpAsm)
+ Passes.add(new PrintFunctionPass("Code after xformations: \n", &cerr));
+
+ // Figure out where we are going to send the output...
+ std::ostream *Out = 0;
+ if (OutputFilename != "") { // Specified an output filename?
+ if (!Force && std::ifstream(OutputFilename.c_str())) {
+ // If force is not specified, make sure not to overwrite a file!
+ cerr << "Error opening '" << OutputFilename << "': File exists!\n"
+ << "Use -f command line argument to force output\n";
+ return 1;
+ }
+ Out = new std::ofstream(OutputFilename.c_str());
+
+ // Make sure that the Out file gets unlink'd from the disk if we get a
+ // SIGINT
+ RemoveFileOnSignal(OutputFilename);
+ } else {
+ if (InputFilename == "-") {
+ OutputFilename = "-";
+ Out = &std::cout;
+ } else {
+ string OutputFilename = GetFileNameRoot(InputFilename);
+ OutputFilename += ".s";
+
+ if (!Force && std::ifstream(OutputFilename.c_str())) {
+ // If force is not specified, make sure not to overwrite a file!
+ cerr << "Error opening '" << OutputFilename << "': File exists!\n"
+ << "Use -f command line argument to force output\n";
+ return 1;
+ }
+
+ Out = new std::ofstream(OutputFilename.c_str());
+ if (!Out->good()) {
+ cerr << "Error opening " << OutputFilename << "!\n";
+ delete Out;
+ return 1;
+ }
+ // Make sure that the Out file gets unlink'd from the disk if we get a
+ // SIGINT
+ RemoveFileOnSignal(OutputFilename);
+ }
+ }
+
+ Target.addPassesToEmitAssembly(Passes, *Out);
+
+ // Run our queue of passes all at once now, efficiently.
+ Passes.run(M.get());
+
+ if (Out != &std::cout) delete Out;
+
return 0;
}
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