Revert r97064. Duncan pointed out that bitcasts are defined in
[oota-llvm.git] / lib / CodeGen / MachineFunctionPass.cpp
1 //===-- MachineFunctionPass.cpp -------------------------------------------===//
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 contains the definitions of the MachineFunctionPass members.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "llvm/Function.h"
15 #include "llvm/Analysis/AliasAnalysis.h"
16 #include "llvm/CodeGen/MachineFunctionAnalysis.h"
17 #include "llvm/CodeGen/MachineFunctionPass.h"
18 using namespace llvm;
19
20 bool MachineFunctionPass::runOnFunction(Function &F) {
21   // Do not codegen any 'available_externally' functions at all, they have
22   // definitions outside the translation unit.
23   if (F.hasAvailableExternallyLinkage())
24     return false;
25
26   MachineFunction &MF = getAnalysis<MachineFunctionAnalysis>().getMF();
27   return runOnMachineFunction(MF);
28 }
29
30 void MachineFunctionPass::getAnalysisUsage(AnalysisUsage &AU) const {
31   AU.addRequired<MachineFunctionAnalysis>();
32   AU.addPreserved<MachineFunctionAnalysis>();
33
34   // MachineFunctionPass preserves all LLVM IR passes, but there's no
35   // high-level way to express this. Instead, just list a bunch of
36   // passes explicitly. This does not include setPreservesCFG,
37   // because CodeGen overloads that to mean preserving the MachineBasicBlock
38   // CFG in addition to the LLVM IR CFG.
39   AU.addPreserved<AliasAnalysis>();
40   AU.addPreserved("scalar-evolution");
41   AU.addPreserved("iv-users");
42   AU.addPreserved("memdep");
43   AU.addPreserved("live-values");
44   AU.addPreserved("domtree");
45   AU.addPreserved("domfrontier");
46   AU.addPreserved("loops");
47   AU.addPreserved("lda");
48
49   FunctionPass::getAnalysisUsage(AU);
50 }