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/IR/Function.h"
15#include "llvm/Analysis/AliasAnalysis.h"
16#include "llvm/CodeGen/MachineFunctionAnalysis.h"
17#include "llvm/CodeGen/MachineFunctionPass.h"
18#include "llvm/CodeGen/Passes.h"
19using namespace llvm;
20
21Pass *MachineFunctionPass::createPrinterPass(raw_ostream &O,
22                                             const std::string &Banner) const {
23  return createMachineFunctionPrinterPass(O, Banner);
24}
25
26bool MachineFunctionPass::runOnFunction(Function &F) {
27  // Do not codegen any 'available_externally' functions at all, they have
28  // definitions outside the translation unit.
29  if (F.hasAvailableExternallyLinkage())
30    return false;
31
32  MachineFunction &MF = getAnalysis<MachineFunctionAnalysis>().getMF();
33  return runOnMachineFunction(MF);
34}
35
36void MachineFunctionPass::getAnalysisUsage(AnalysisUsage &AU) const {
37  AU.addRequired<MachineFunctionAnalysis>();
38  AU.addPreserved<MachineFunctionAnalysis>();
39
40  // MachineFunctionPass preserves all LLVM IR passes, but there's no
41  // high-level way to express this. Instead, just list a bunch of
42  // passes explicitly. This does not include setPreservesCFG,
43  // because CodeGen overloads that to mean preserving the MachineBasicBlock
44  // CFG in addition to the LLVM IR CFG.
45  AU.addPreserved<AliasAnalysis>();
46  AU.addPreserved("scalar-evolution");
47  AU.addPreserved("iv-users");
48  AU.addPreserved("memdep");
49  AU.addPreserved("live-values");
50  AU.addPreserved("domtree");
51  AU.addPreserved("domfrontier");
52  AU.addPreserved("loops");
53  AU.addPreserved("lda");
54  AU.addPreserved("stack-protector");
55
56  FunctionPass::getAnalysisUsage(AU);
57}
58