lib/CodeGen/Passes.cpp

   1 //===-- Passes.cpp - Target independent code generation passes ------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file was developed by the LLVM research group and is distributed under
   6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file defines interfaces to access the target independent code
  11 // generation passes provided by the LLVM backend.
  12 //
  13 //===---------------------------------------------------------------------===//
  14
  15 #include "llvm/CodeGen/RegAllocRegistry.h"
  16 #include "llvm/CodeGen/Passes.h"
  17 #include <iostream>
  18
  19 using namespace llvm;
  20
  21 //===---------------------------------------------------------------------===//
  22 ///
  23 /// RegisterRegAlloc class - Track the registration of register allocators.
  24 ///
  25 //===---------------------------------------------------------------------===//
  26 MachinePassRegistry RegisterRegAlloc::Registry;
  27
  28
  29 //===---------------------------------------------------------------------===//
  30 ///
  31 /// RegAlloc command line options.
  32 ///
  33 //===---------------------------------------------------------------------===//
  34 namespace {
  35   cl::opt<RegisterRegAlloc::FunctionPassCtor, false,
  36           RegisterPassParser<RegisterRegAlloc> >
  37   RegAlloc("regalloc",
  38            cl::init(&createLinearScanRegisterAllocator),
  39            cl::desc("Register allocator to use: (default = linearscan)"));
  40 }
  41
  42
  43 //===---------------------------------------------------------------------===//
  44 ///
  45 /// createRegisterAllocator - choose the appropriate register allocator.
  46 ///
  47 //===---------------------------------------------------------------------===//
  48 FunctionPass *llvm::createRegisterAllocator() {
  49   RegisterRegAlloc::FunctionPassCtor Ctor = RegisterRegAlloc::getDefault();
  50
  51   if (!Ctor) {
  52     Ctor = RegAlloc;
  53     RegisterRegAlloc::setDefault(RegAlloc);
  54   }
  55
  56   return Ctor();
  57 }