MachineFunctionPass.cpp revision 8a261e44f71a433b7d9af373c3e3dfa6fea67146 
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"
18using namespace llvm;
19
20bool 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
30void 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}
51