Passes.cpp revision 4a3f6c88820a204f80ca0fa3f1f2fe09ca10b02f 
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
18using namespace llvm;
19
20//===---------------------------------------------------------------------===//
21///
22/// RegisterRegAlloc class - Track the registration of register allocators.
23///
24//===---------------------------------------------------------------------===//
25MachinePassRegistry RegisterRegAlloc::Registry;
26
27
28//===---------------------------------------------------------------------===//
29///
30/// RegAlloc command line options.
31///
32//===---------------------------------------------------------------------===//
33namespace {
34  static
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//===---------------------------------------------------------------------===//
48FunctionPass *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}
58