-//===-- 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.
//
//===----------------------------------------------------------------------===//
#include "llvm/Bytecode/Reader.h"
-#include "llvm/Optimizations/Normalize.h"
-#include "llvm/Target/Sparc.h"
+#include "llvm/Target/TargetMachineImpls.h"
#include "llvm/Target/TargetMachine.h"
-#include "llvm/Transforms/Instrumentation/TraceValues.h"
-#include "llvm/Support/CommandLine.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 "Support/Signals.h"
#include <memory>
-#include <string>
#include <fstream>
-cl::String InputFilename ("", "Input filename", cl::NoFlags, "-");
-cl::String OutputFilename("o", "Output filename", cl::NoFlags, "");
-cl::Flag Force ("f", "Overwrite output files", cl::NoFlags, false);
-cl::Flag DumpAsm ("d", "Print bytecode before native code generation", cl::Hidden,false);
-cl::Flag DoNotEmitAssembly("noasm", "Do not emit assembly code", cl::Hidden, false);
-cl::Flag TraceBBValues ("trace",
- "Trace values at basic block and method exits",
- cl::NoFlags, false);
-cl::Flag TraceMethodValues("tracem", "Trace values only at method exits",
- cl::NoFlags, false);
-
-#include "llvm/Assembly/Writer.h" // For DumpAsm
-
-//-------------------------- Internal Functions ------------------------------//
-
-
-/////
-// TODO: Remove to external file.... When Chris gets back he'll do it
-/////
-#include "llvm/DerivedTypes.h"
-#include "llvm/iMemory.h"
-#include "llvm/iOther.h"
-#include "llvm/SymbolTable.h"
-
-
-Method *MallocMeth = 0, *FreeMeth = 0;
-
-// InsertMallocFreeDecls - Insert an external declaration for malloc and an
-// external declaration for free for use by the ReplaceMallocFree function.
-//
-static void InsertMallocFreeDecls(Module *M) {
- const MethodType *MallocType =
- MethodType::get(PointerType::get(Type::UByteTy),
- vector<const Type*>(1, Type::UIntTy), false);
-
- SymbolTable *SymTab = M->getSymbolTableSure();
-
- // Check for a definition of malloc
- if (Value *V = SymTab->lookup(PointerType::get(MallocType), "malloc")) {
- MallocMeth = cast<Method>(V); // Yup, got it
- } else { // Nope, add one
- M->getMethodList().push_back(MallocMeth = new Method(MallocType, "malloc"));
- }
-
- const MethodType *FreeType =
- MethodType::get(Type::VoidTy,
- vector<const Type*>(1, PointerType::get(Type::UByteTy)),
- false);
-
- // Check for a definition of free
- if (Value *V = SymTab->lookup(PointerType::get(FreeType), "free")) {
- FreeMeth = cast<Method>(V); // Yup, got it
- } else { // Nope, add one
- M->getMethodList().push_back(FreeMeth = new Method(FreeType, "free"));
- }
-}
-
-
-static void ReplaceMallocFree(Method *M, const TargetData &DataLayout) {
- assert(MallocMeth && FreeMeth && M && "Must call InsertMallocFreeDecls!");
-
- // Loop over all of the instructions, looking for malloc or free instructions
- for (Method::iterator BBI = M->begin(), BBE = M->end(); BBI != BBE; ++BBI) {
- BasicBlock *BB = *BBI;
- for (unsigned i = 0; i < BB->size(); ++i) {
- BasicBlock::InstListType &BBIL = BB->getInstList();
- if (MallocInst *MI = dyn_cast<MallocInst>(*(BBIL.begin()+i))) {
- BBIL.remove(BBIL.begin()+i); // remove the malloc instr...
-
- const Type *AllocTy = cast<PointerType>(MI->getType())->getValueType();
-
- // If the user is allocating an unsized array with a dynamic size arg,
- // start by getting the size of one element.
- //
- if (const ArrayType *ATy = dyn_cast<ArrayType>(AllocTy))
- if (ATy->isUnsized()) AllocTy = ATy->getElementType();
-
- // Get the number of bytes to be allocated for one element of the
- // requested type...
- unsigned Size = DataLayout.getTypeSize(AllocTy);
-
- // malloc(type) becomes sbyte *malloc(constint)
- Value *MallocArg = ConstPoolUInt::get(Type::UIntTy, Size);
- if (MI->getNumOperands() && Size == 1) {
- MallocArg = MI->getOperand(0); // Operand * 1 = Operand
- } else if (MI->getNumOperands()) {
- // Multiply it by the array size if neccesary...
- MallocArg = BinaryOperator::create(Instruction::Mul,MI->getOperand(0),
- MallocArg);
- BBIL.insert(BBIL.begin()+i++, cast<Instruction>(MallocArg));
- }
-
- // Create the call to Malloc...
- CallInst *MCall = new CallInst(MallocMeth,
- vector<Value*>(1, MallocArg));
- BBIL.insert(BBIL.begin()+i, MCall);
-
- // Create a cast instruction to convert to the right type...
- CastInst *MCast = new CastInst(MCall, MI->getType());
- BBIL.insert(BBIL.begin()+i+1, MCast);
-
- // Replace all uses of the old malloc inst with the cast inst
- MI->replaceAllUsesWith(MCast);
- delete MI; // Delete the malloc inst
- } else if (FreeInst *FI = dyn_cast<FreeInst>(*(BBIL.begin()+i))) {
- BBIL.remove(BB->getInstList().begin()+i);
+using namespace llvm;
- // Cast the argument to free into a ubyte*...
- CastInst *MCast = new CastInst(FI->getOperand(0),
- PointerType::get(Type::UByteTy));
- BBIL.insert(BBIL.begin()+i, MCast);
+// 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("-"));
- // Insert a call to the free function...
- CallInst *FCall = new CallInst(FreeMeth,
- vector<Value*>(1, MCast));
- BBIL.insert(BBIL.begin()+i+1, FCall);
-
- // Delete the old free instruction
- delete FI;
- }
- }
- }
-}
+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"));
-// END TODO: Remove to external file....
+enum ArchName { noarch, X86, Sparc, PowerPC, CBackend };
-static void NormalizeMethod(Method *M) {
- NormalizePhiConstantArgs(M);
-}
+static cl::opt<ArchName>
+Arch("march", cl::desc("Architecture to generate assembly for:"), cl::Prefix,
+ cl::values(clEnumValN(X86, "x86", " IA-32 (Pentium and above)"),
+ clEnumValN(Sparc, "sparc", " SPARC V9"),
+ clEnumValN(PowerPC, "powerpc", " PowerPC"),
+ clEnumValN(CBackend, "c", " C backend"),
+ 0),
+ cl::init(noarch));
-inline string
-GetFileNameRoot(const string& InputFilename)
+// GetFileNameRoot - Helper function to get the basename of a filename...
+static inline std::string
+GetFileNameRoot(const std::string &InputFilename)
{
- string IFN = InputFilename;
- string outputFilename;
+ 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; // Append a .s to it
+ outputFilename = IFN;
}
return outputFilename;
}
-inline string
-GetTraceAssemblyFileName(const string& inFilename)
-{
- assert(inFilename != "-" && "files on stdin not supported with tracing");
- string traceFileName = GetFileNameRoot(inFilename);
- traceFileName += ".trace.ll";
- return traceFileName;
-}
-
-//===---------------------------------------------------------------------===//
-// Function PreprocessModule()
-//
-// Normalization to simplify later passes.
-//===---------------------------------------------------------------------===//
-int
-PreprocessModule(Module* module)
-{
- InsertMallocFreeDecls(module);
-
- for (Module::const_iterator MI=module->begin(); MI != module->end(); ++MI)
- if (! (*MI)->isExternal())
- NormalizeMethod(*MI);
+// main - Entry point for the llc compiler.
+//
+int main(int argc, char **argv) {
+ cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
- return 0;
-}
-
-
-//===---------------------------------------------------------------------===//
-// Function OptimizeModule()
-//
-// Module optimization.
-//===---------------------------------------------------------------------===//
-
-int
-OptimizeModule(Module* module)
-{
- return 0;
-}
+ // Load the module to be compiled...
+ std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
+ if (M.get() == 0) {
+ 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;
+ switch (Arch) {
+ case CBackend:
+ TargetMachineAllocator = allocateCTargetMachine;
+ break;
+ case X86:
+ TargetMachineAllocator = allocateX86TargetMachine;
+ break;
+ case Sparc:
+ TargetMachineAllocator = allocateSparcTargetMachine;
+ break;
+ case PowerPC:
+ TargetMachineAllocator = allocatePowerPCTargetMachine;
+ break;
+ default:
+ // Decide what the default target machine should be, by looking at
+ // the module. This heuristic (ILP32, LE -> IA32; LP64, BE ->
+ // SPARCV9) is kind of gross, but it will work until we have more
+ // sophisticated target information to work from.
+ if (mod.getEndianness() == Module::LittleEndian &&
+ mod.getPointerSize() == Module::Pointer32) {
+ TargetMachineAllocator = allocateX86TargetMachine;
+ } else if (mod.getEndianness() == Module::BigEndian &&
+ mod.getPointerSize() == Module::Pointer32) {
+ TargetMachineAllocator = allocatePowerPCTargetMachine;
+ } else if (mod.getEndianness() == Module::BigEndian &&
+ mod.getPointerSize() == Module::Pointer64) {
+ TargetMachineAllocator = allocateSparcTargetMachine;
+ } else {
+ // If the module is target independent, favor a target which matches the
+ // current build system.
+#if defined(i386) || defined(__i386__) || defined(__x86__)
+ TargetMachineAllocator = allocateX86TargetMachine;
+#elif defined(sparc) || defined(__sparc__) || defined(__sparcv9)
+ TargetMachineAllocator = allocateSparcTargetMachine;
+#elif defined(__POWERPC__) || defined(__ppc__) || defined(__APPLE__)
+ TargetMachineAllocator = allocatePowerPCTargetMachine;
+#else
+ std::cerr << argv[0] << ": module does not specify a target to use. "
+ << "You must use the -march option. If no native target is "
+ << "available, use -march=c to emit C code.\n";
+ return 1;
+#endif
+ }
+ break;
+ }
+ std::auto_ptr<TargetMachine> target(TargetMachineAllocator(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;
-//===---------------------------------------------------------------------===//
-// Function GenerateCodeForModule()
-//
-// Native code generation for a specified target.
-//===---------------------------------------------------------------------===//
+ Passes.add(new TargetData("llc", TD.isLittleEndian(), TD.getPointerSize(),
+ TD.getPointerAlignment(), TD.getDoubleAlignment()));
-int
-GenerateCodeForModule(Module* module, TargetMachine* target)
-{
- // Since any transformation pass may introduce external function decls
- // into the method list, find current methods first and then walk only those.
- //
- vector<Method*> initialMethods(module->begin(), module->end());
-
-
- // Replace malloc and free instructions with library calls
- //
- for (unsigned i=0, N = initialMethods.size(); i < N; i++)
- if (! initialMethods[i]->isExternal())
- ReplaceMallocFree(initialMethods[i], target->DataLayout);
-
-
- // Insert trace code to assist debugging
- //
- if (TraceBBValues || TraceMethodValues)
- {
- // Insert trace code in all methods in the module
- for (unsigned i=0, N = initialMethods.size(); i < N; i++)
- if (! initialMethods[i]->isExternal())
- InsertCodeToTraceValues(initialMethods[i], TraceBBValues,
- TraceBBValues || TraceMethodValues);
-
- // Then write the module with tracing code out in assembly form
- string traceFileName = GetTraceAssemblyFileName(InputFilename);
- ofstream* ofs = new ofstream(traceFileName.c_str(),
- (Force ? 0 : ios::noreplace)|ios::out);
- if (!ofs->good()) {
- cerr << "Error opening " << traceFileName << "!\n";
- delete ofs;
- return 1;
- }
- WriteToAssembly(module, *ofs);
- delete ofs;
- }
-
-
- // Generate native target code for all methods
- //
- for (unsigned i=0, N = initialMethods.size(); i < N; i++)
- if (! initialMethods[i]->isExternal())
- {
- if (DumpAsm)
- cerr << "Method after xformations: \n" << initialMethods[i];
-
- if (target->compileMethod(initialMethods[i])) {
- cerr << "Error compiling " << InputFilename << "!\n";
- return 1;
- }
+ // 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;
}
-
- return 0;
-}
-
+ Out = new std::ofstream(OutputFilename.c_str());
-//===---------------------------------------------------------------------===//
-// Function EmitAssemblyForModule()
-//
-// Write assembly code to specified output file; <ModuleName>.s by default.
-//===---------------------------------------------------------------------===//
-
-int
-EmitAssemblyForModule(Module* module, TargetMachine* target)
-{
- // Figure out where we are going to send the output...
- ostream *Out = 0;
- if (OutputFilename != "") { // Specified an output filename?
- Out = new ofstream(OutputFilename.c_str(),
- (Force ? 0 : ios::noreplace)|ios::out);
+ // Make sure that the Out file gets unlinked from the disk if we get a
+ // SIGINT
+ RemoveFileOnSignal(OutputFilename);
+ } else {
+ Out = &std::cout;
+ }
} else {
if (InputFilename == "-") {
OutputFilename = "-";
- Out = &cout;
+ Out = &std::cout;
} else {
- string OutputFilename = GetFileNameRoot(InputFilename);
- OutputFilename += ".s";
- Out = new ofstream(OutputFilename.c_str(),
- (Force ? 0 : ios::noreplace)|ios::out);
+ OutputFilename = GetFileNameRoot(InputFilename);
+
+ if (Arch != CBackend)
+ 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!
+ 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());
if (!Out->good()) {
- cerr << "Error opening " << OutputFilename << "!\n";
+ 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
+ RemoveFileOnSignal(OutputFilename);
}
}
- // Emit the output...
- target->emitAssembly(module, *Out);
+ // 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());
+ }
- if (Out != &cout) delete Out;
+ // Delete the ostream if it's not a stdout stream
+ if (Out != &std::cout) delete Out;
return 0;
}
-
-
-//===---------------------------------------------------------------------===//
-// Function main()
-//
-// Entry point for the llc compiler.
-//===---------------------------------------------------------------------===//
-
-int
-main(int argc, char **argv)
-{
- // Parse command line options...
- cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
-
- // Allocate a target... in the future this will be controllable on the
- // command line.
- auto_ptr<TargetMachine> target(allocateSparcTargetMachine());
-
- // Load the module to be compiled...
- auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
- if (M.get() == 0) {
- cerr << "bytecode didn't read correctly.\n";
- return 1;
- }
-
- int failed = PreprocessModule(M.get());
-
- if (!failed)
- failed = OptimizeModule(M.get());
-
- if (!failed)
- failed = GenerateCodeForModule(M.get(), target.get());
-
- if (!failed && ! DoNotEmitAssembly)
- failed = EmitAssemblyForModule(M.get(), target.get());
-
- return failed;
-}
-
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