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
  18 using namespace llvm;
  19
  20 //===---------------------------------------------------------------------===//
  21 ///
  22 /// RegisterRegAlloc class - Track the registration of register allocators.
  23 ///
  24 //===---------------------------------------------------------------------===//
  25 MachinePassRegistry RegisterRegAlloc::Registry;
  26
  27
  28 //===---------------------------------------------------------------------===//
  29 ///
  30 /// RegAlloc command line options.
  31 ///
  32 //===---------------------------------------------------------------------===//
  33 namespace {
  34   cl::opt<RegisterRegAlloc::FunctionPassCtor, false,
  35           RegisterPassParser<RegisterRegAlloc> >
  36   RegAlloc("regalloc",
  37            cl::init(&createLinearScanRegisterAllocator),
  38            cl::desc("Register allocator to use: (default = linearscan)"));
  39 }
  40
  41
  42 //===---------------------------------------------------------------------===//
  43 ///
  44 /// createRegisterAllocator - choose the appropriate register allocator.
  45 ///
  46 //===---------------------------------------------------------------------===//
  47 FunctionPass *llvm::createRegisterAllocator() {
  48   RegisterRegAlloc::FunctionPassCtor Ctor = RegisterRegAlloc::getDefault();
  49
  50   if (!Ctor) {
  51     Ctor = RegAlloc;
  52     RegisterRegAlloc::setDefault(RegAlloc);
  53   }
  54
  55   return Ctor();
  56 }