lib/Target/Mips/MipsModuleISelDAGToDAG.cpp

   1 //===----------------------------------------------------------------------===//
   2 // Instruction Selector Subtarget Control
   3 //===----------------------------------------------------------------------===//
   4
   5 //===----------------------------------------------------------------------===//
   6 // This file defines a pass used to change the subtarget for the
   7 // Mips Instruction selector.
   8 //
   9 //===----------------------------------------------------------------------===//
  10
  11 #include "Mips.h"
  12 #include "MipsTargetMachine.h"
  13 #include "llvm/CodeGen/TargetPassConfig.h"
  14 #include "llvm/CodeGen/StackProtector.h"
  15 #include "llvm/Support/Debug.h"
  16 #include "llvm/Support/raw_ostream.h"
  17
  18 using namespace llvm;
  19
  20 #define DEBUG_TYPE "mips-isel"
  21
  22 namespace {
  23   class MipsModuleDAGToDAGISel : public MachineFunctionPass {
  24   public:
  25     static char ID;
  26
  27     MipsModuleDAGToDAGISel() : MachineFunctionPass(ID) {}
  28
  29     // Pass Name
  30     StringRef getPassName() const override {
  31       return "MIPS DAG->DAG Pattern Instruction Selection";
  32     }
  33
  34     void getAnalysisUsage(AnalysisUsage &AU) const override {
  35       AU.addRequired<TargetPassConfig>();
  36       AU.addPreserved<StackProtector>();
  37       MachineFunctionPass::getAnalysisUsage(AU);
  38     }
  39
  40     bool runOnMachineFunction(MachineFunction &MF) override;
  41   };
  42
  43   char MipsModuleDAGToDAGISel::ID = 0;
  44 }
  45
  46 bool MipsModuleDAGToDAGISel::runOnMachineFunction(MachineFunction &MF) {
  47   LLVM_DEBUG(errs() << "In MipsModuleDAGToDAGISel::runMachineFunction\n");
  48   auto &TPC = getAnalysis<TargetPassConfig>();
  49   auto &TM = TPC.getTM<MipsTargetMachine>();
  50   TM.resetSubtarget(&MF);
  51   return false;
  52 }
  53
  54 llvm::FunctionPass *llvm::createMipsModuleISelDagPass() {
  55   return new MipsModuleDAGToDAGISel();
  56 }