-//===-- llc.cpp - Implement the LLVM Compiler -----------------------------===//
+//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
-// This is the llc compiler driver.
+// This is the llc code generator driver. It provides a convenient
+// command-line interface for generating native assembly-language code
+// or C code, given LLVM bytecode.
//
//===----------------------------------------------------------------------===//
#include "llvm/Bytecode/Reader.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/Assembly/PrintModulePass.h"
-#include "llvm/Bytecode/WriteBytecodePass.h"
-#include "llvm/Transforms/ConstantMerge.h"
+#include "llvm/Target/TargetMachineRegistry.h"
+#include "llvm/Transforms/Scalar.h"
#include "llvm/Module.h"
-#include "llvm/Method.h"
#include "llvm/PassManager.h"
+#include "llvm/Pass.h"
#include "Support/CommandLine.h"
-#include <memory>
-#include <string>
+#include "Support/PluginLoader.h"
+#include "llvm/System/Signals.h"
#include <fstream>
-using std::string;
+#include <iostream>
+#include <memory>
+
+using namespace llvm;
+
+// General options for llc. Other pass-specific options are specified
+// within the corresponding llc passes, and target-specific options
+// and back-end code generation options are specified with the target machine.
+//
+static cl::opt<std::string>
+InputFilename(cl::Positional, cl::desc("<input bytecode>"), cl::init("-"));
-cl::String InputFilename ("", "Input filename", cl::NoFlags, "-");
-cl::String OutputFilename("o", "Output filename", cl::NoFlags, "");
-cl::Flag Force ("f", "Overwrite output files");
-cl::Flag DumpAsm ("d", "Print bytecode before native code generation",
- cl::Hidden);
-cl::Flag DoNotEmitAssembly("noasm", "Do not emit assembly code", cl::Hidden);
-cl::Flag TraceBBValues ("trace",
- "Trace values at basic block and method exits");
-cl::Flag TraceMethodValues("tracem", "Trace values only at method exits");
+static cl::opt<std::string>
+OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"));
+static cl::opt<bool> Force("f", cl::desc("Overwrite output files"));
+static cl::opt<const TargetMachineRegistry::Entry*, false, TargetNameParser>
+MArch("march", cl::desc("Architecture to generate assembly for:"));
+
// GetFileNameRoot - Helper function to get the basename of a filename...
-static inline string GetFileNameRoot(const string &InputFilename) {
- string IFN = InputFilename;
- string outputFilename;
+static inline std::string
+GetFileNameRoot(const std::string &InputFilename) {
+ std::string IFN = InputFilename;
+ std::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/
+ if ((Len > 2) &&
+ IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
+ outputFilename = std::string(IFN.begin(), IFN.end()-3); // s/.bc/.s/
} else {
outputFilename = IFN;
}
}
-//===---------------------------------------------------------------------===//
-// GenerateCodeForTarget Pass
-//
-// Native code generation for a specified target.
-//===---------------------------------------------------------------------===//
-
-class GenerateCodeForTarget : public MethodPass {
- TargetMachine &Target;
-public:
- inline GenerateCodeForTarget(TargetMachine &T) : Target(T) {}
-
- // runOnMethod - This method does the actual work of generating code for
- // the specified method.
- //
- bool runOnMethod(Method *M) {
- if (Target.compileMethod(M))
- cerr << "Error compiling " << InputFilename << "!\n";
-
- return true;
- }
-};
-
-
-//===---------------------------------------------------------------------===//
-// EmitMethodAssembly Pass
-//
-// Write assembly code for each method to specified output stream
-//===---------------------------------------------------------------------===//
-
-class EmitMethodAssembly : public MethodPass {
- TargetMachine &Target; // Target to compile for
- std::ostream *Out; // Stream to print on
-public:
- inline EmitMethodAssembly(TargetMachine &T, std::ostream *O)
- : Target(T), Out(O) {}
-
- virtual bool runOnMethod(Method *M) {
- Target.emitAssembly(M, *Out);
- Target.freeCompiledMethod(M); // Release memory for the method
- return false;
- }
-};
-
-
-//===---------------------------------------------------------------------===//
-// EmitGlobalsAssembly Pass
-//
-// Write assembly code for global values to specified output stream
-//===---------------------------------------------------------------------===//
-
-class EmitGlobalsAssembly : public Pass {
- const TargetMachine &Target; // Target to compile for
- std::ostream *Out; // Stream to print on
- bool DeleteStream; // Delete stream in dtor?
-public:
- inline EmitGlobalsAssembly(const TargetMachine &T, std::ostream *O, bool D)
- : Target(T), Out(O), DeleteStream(D) {}
-
- virtual bool run(Module *M) {
- Target.emitAssembly(M, *Out);
- if (DeleteStream) delete Out;
- return false;
- }
-};
-
-
-
-//===---------------------------------------------------------------------===//
-// Function main()
-//
-// Entry point for the llc compiler.
-//===---------------------------------------------------------------------===//
-
+// main - 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!");
+ sys::PrintStackTraceOnErrorSignal();
- TargetMachine &Target = *target.get();
-
// Load the module to be compiled...
std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
if (M.get() == 0) {
- cerr << "bytecode didn't read correctly.\n";
+ std::cerr << argv[0] << ": bytecode didn't read correctly.\n";
return 1;
}
+ Module &mod = *M.get();
+
+ // Allocate target machine. First, check whether the user has
+ // explicitly specified an architecture to compile for.
+ TargetMachine* (*TargetMachineAllocator)(const Module&,
+ IntrinsicLowering *) = 0;
+ if (MArch == 0) {
+ std::string Err;
+ MArch = TargetMachineRegistry::getClosestStaticTargetForModule(mod, Err);
+ if (MArch == 0) {
+ std::cerr << argv[0] << ": error auto-selecting target for module '"
+ << Err << "'. Please use the -march option to explicitly "
+ << "pick a target.\n";
+ return 1;
+ }
+ }
+
+ std::auto_ptr<TargetMachine> target(MArch->CtorFn(mod, 0));
+ assert(target.get() && "Could not allocate target machine!");
+ TargetMachine &Target = *target.get();
+ const TargetData &TD = Target.getTargetData();
// Build up all of the passes that we want to do to the module...
PassManager Passes;
+ Passes.add(new TargetData("llc", TD.isLittleEndian(), TD.getPointerSize(),
+ TD.getPointerAlignment(), TD.getDoubleAlignment()));
+
+ // Figure out where we are going to send the output...
+ std::ostream *Out = 0;
+ if (OutputFilename != "") {
+ 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!
+ std::cerr << argv[0] << ": error opening '" << OutputFilename
+ << "': file exists!\n"
+ << "Use -f command line argument to force output\n";
+ return 1;
+ }
+ Out = new std::ofstream(OutputFilename.c_str());
- // Hoist constants out of PHI nodes into predecessor BB's
- Passes.add(new HoistPHIConstants());
-
- if (TraceBBValues || TraceMethodValues) { // If tracing enabled...
- // Insert trace code in all methods in the module
- Passes.add(new InsertTraceCode(TraceBBValues,
- TraceBBValues ||TraceMethodValues));
-
- // Eliminate duplication in constant pool
- Passes.add(new DynamicConstantMerge());
-
- // Then write out the module with tracing code before code generation
- 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;
+ // Make sure that the Out file gets unlinked from the disk if we get a
+ // SIGINT
+ sys::RemoveFileOnSignal(OutputFilename);
+ } else {
+ Out = &std::cout;
}
+ } else {
+ if (InputFilename == "-") {
+ OutputFilename = "-";
+ Out = &std::cout;
+ } else {
+ OutputFilename = GetFileNameRoot(InputFilename);
- 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));
- }
-
- // 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(new LowerAllocations(Target.DataLayout));
-
- // If LLVM dumping after transformations is requested, add it to the pipeline
- if (DumpAsm)
- Passes.add(new PrintMethodPass("Code after xformations: \n",&cerr));
-
- // Generate Target code...
- Passes.add(new GenerateCodeForTarget(Target));
-
- if (!DoNotEmitAssembly) { // If asm output is enabled...
- // Figure out where we are going to send the output...
- std::ostream *Out = 0;
- if (OutputFilename != "") { // Specified an output filename?
+ if (MArch->Name[0] != 'c' || MArch->Name[1] != 0) // not CBE
+ OutputFilename += ".s";
+ else
+ OutputFilename += ".cbe.c";
+
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";
+ std::cerr << argv[0] << ": error opening '" << OutputFilename
+ << "': file exists!\n"
+ << "Use -f command line argument to force output\n";
return 1;
}
+
Out = new std::ofstream(OutputFilename.c_str());
- } 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;
- }
+ if (!Out->good()) {
+ std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
+ delete Out;
+ return 1;
}
+
+ // Make sure that the Out file gets unlinked from the disk if we get a
+ // SIGINT
+ sys::RemoveFileOnSignal(OutputFilename);
}
-
- // Output assembly language to the .s file. Assembly emission is split into
- // two parts: Method output and Global value output. This is because method
- // output is pipelined with all of the rest of code generation stuff,
- // allowing machine code representations for methods to be free'd after the
- // method has been emitted.
- //
- Passes.add(new EmitMethodAssembly(Target, Out)); // for methods
-
- // For global values...
- Passes.add(new EmitGlobalsAssembly(Target, Out, Out != &std::cout));
}
-
- // Run our queue of passes all at once now, efficiently.
- Passes.run(M.get());
- return 0;
-}
+ // Ask the target to add backend passes as necessary
+ if (Target.addPassesToEmitAssembly(Passes, *Out)) {
+ std::cerr << argv[0] << ": target '" << Target.getName()
+ << "' does not support static compilation!\n";
+ if (Out != &std::cout) delete Out;
+ // And the Out file is empty and useless, so remove it now.
+ std::remove(OutputFilename.c_str());
+ return 1;
+ } else {
+ // Run our queue of passes all at once now, efficiently.
+ Passes.run(*M.get());
+ }
+ // Delete the ostream if it's not a stdout stream
+ if (Out != &std::cout) delete Out;
+ return 0;
+}
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