LLVM API Documentation

SparcTargetMachine.cpp

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00001 //===-- SparcTargetMachine.cpp - Define TargetMachine for Sparc -----------===//
00002 //
00003 //                     The LLVM Compiler Infrastructure
00004 //
00005 // This file was developed by the LLVM research group and is distributed under
00006 // the University of Illinois Open Source License. See LICENSE.TXT for details.
00007 //
00008 //===----------------------------------------------------------------------===//
00009 //
00010 //
00011 //===----------------------------------------------------------------------===//
00012 
00013 #include "SparcTargetMachine.h"
00014 #include "Sparc.h"
00015 #include "llvm/Assembly/PrintModulePass.h"
00016 #include "llvm/Module.h"
00017 #include "llvm/PassManager.h"
00018 #include "llvm/CodeGen/MachineFunction.h"
00019 #include "llvm/CodeGen/Passes.h"
00020 #include "llvm/Target/TargetOptions.h"
00021 #include "llvm/Target/TargetMachineRegistry.h"
00022 #include "llvm/Transforms/Scalar.h"
00023 #include <iostream>
00024 using namespace llvm;
00025 
00026 namespace {
00027   // Register the target.
00028   RegisterTarget<SparcTargetMachine> X("sparc", "  SPARC");
00029 }
00030 
00031 /// SparcTargetMachine ctor - Create an ILP32 architecture model
00032 ///
00033 SparcTargetMachine::SparcTargetMachine(const Module &M, const std::string &FS)
00034   : TargetMachine("Sparc"), DataLayout("E-p:32:32"),
00035     Subtarget(M, FS), InstrInfo(Subtarget),
00036     FrameInfo(TargetFrameInfo::StackGrowsDown, 8, 0) {
00037 }
00038 
00039 unsigned SparcTargetMachine::getModuleMatchQuality(const Module &M) {
00040   std::string TT = M.getTargetTriple();
00041   if (TT.size() >= 6 && std::string(TT.begin(), TT.begin()+6) == "sparc-")
00042     return 20;
00043 
00044   if (M.getEndianness()  == Module::BigEndian &&
00045       M.getPointerSize() == Module::Pointer32)
00046 #ifdef __sparc__
00047     return 20;   // BE/32 ==> Prefer sparc on sparc
00048 #else
00049     return 5;    // BE/32 ==> Prefer ppc elsewhere
00050 #endif
00051   else if (M.getEndianness() != Module::AnyEndianness ||
00052            M.getPointerSize() != Module::AnyPointerSize)
00053     return 0;                                    // Match for some other target
00054 
00055   return 0;
00056 }
00057 
00058 /// addPassesToEmitFile - Add passes to the specified pass manager
00059 /// to implement a static compiler for this target.
00060 ///
00061 bool SparcTargetMachine::addPassesToEmitFile(PassManager &PM, std::ostream &Out,
00062                                              CodeGenFileType FileType,
00063                                              bool Fast) {
00064   if (FileType != TargetMachine::AssemblyFile) return true;
00065 
00066   // Run loop strength reduction before anything else.
00067   if (!Fast) PM.add(createLoopStrengthReducePass());
00068 
00069   // FIXME: Implement efficient support for garbage collection intrinsics.
00070   PM.add(createLowerGCPass());
00071 
00072   // FIXME: implement the invoke/unwind instructions!
00073   PM.add(createLowerInvokePass());
00074 
00075   // Print LLVM code input to instruction selector:
00076   if (PrintMachineCode)
00077     PM.add(new PrintFunctionPass());
00078 
00079   // Make sure that no unreachable blocks are instruction selected.
00080   PM.add(createUnreachableBlockEliminationPass());
00081   
00082   PM.add(createSparcISelDag(*this));
00083 
00084   // Print machine instructions as they were initially generated.
00085   if (PrintMachineCode)
00086     PM.add(createMachineFunctionPrinterPass(&std::cerr));
00087 
00088   PM.add(createRegisterAllocator());
00089   PM.add(createPrologEpilogCodeInserter());
00090 
00091   // Print machine instructions after register allocation and prolog/epilog
00092   // insertion.
00093   if (PrintMachineCode)
00094     PM.add(createMachineFunctionPrinterPass(&std::cerr));
00095 
00096   PM.add(createSparcFPMoverPass(*this));
00097 
00098   PM.add(createSparcDelaySlotFillerPass(*this));
00099 
00100   // Print machine instructions after filling delay slots.
00101   if (PrintMachineCode)
00102     PM.add(createMachineFunctionPrinterPass(&std::cerr));
00103 
00104   // Output assembly language.
00105   PM.add(createSparcCodePrinterPass(Out, *this));
00106 
00107   // Delete the MachineInstrs we generated, since they're no longer needed.
00108   PM.add(createMachineCodeDeleter());
00109   return false;
00110 }
00111