lib/CodeGen/Passes.cpp

   1 //===-- Passes.cpp - Target independent code generation passes ------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // 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 static cl::opt<RegisterRegAlloc::FunctionPassCtor, false,
  34                RegisterPassParser<RegisterRegAlloc> >
  35 RegAlloc("regalloc",
  36          cl::init(&createLinearScanRegisterAllocator),
  37          cl::desc("Register allocator to use: (default = linearscan)"));
  38
  39
  40 //===---------------------------------------------------------------------===//
  41 ///
  42 /// createRegisterAllocator - choose the appropriate register allocator.
  43 ///
  44 //===---------------------------------------------------------------------===//
  45 FunctionPass *llvm::createRegisterAllocator() {
  46   RegisterRegAlloc::FunctionPassCtor Ctor = RegisterRegAlloc::getDefault();
  47
  48   if (!Ctor) {
  49     Ctor = RegAlloc;
  50     RegisterRegAlloc::setDefault(RegAlloc);
  51   }
  52
  53   return Ctor();
  54 }