LLVM  8.0.0svn
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1 //===- DominanceFrontier.cpp - Dominance Frontier Calculation -------------===//
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 //===----------------------------------------------------------------------===//
12 #include "llvm/Config/llvm-config.h"
13 #include "llvm/IR/Dominators.h"
14 #include "llvm/IR/Function.h"
15 #include "llvm/IR/PassManager.h"
16 #include "llvm/Pass.h"
17 #include "llvm/Support/Compiler.h"
18 #include "llvm/Support/Debug.h"
21 using namespace llvm;
23 namespace llvm {
29 } // end namespace llvm
34  "Dominance Frontier Construction", true, true)
37  "Dominance Frontier Construction", true, true)
39 DominanceFrontierWrapperPass::DominanceFrontierWrapperPass()
40  : FunctionPass(ID), DF() {
42 }
45  DF.releaseMemory();
46 }
49  releaseMemory();
50  DF.analyze(getAnalysis<DominatorTreeWrapperPass>().getDomTree());
51  return false;
52 }
55  AU.setPreservesAll();
57 }
60  DF.print(OS);
61 }
63 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
65  print(dbgs());
66 }
67 #endif
69 /// Handle invalidation explicitly.
72  // Check whether the analysis, all analyses on functions, or the function's
73  // CFG have been preserved.
74  auto PAC = PA.getChecker<DominanceFrontierAnalysis>();
75  return !(PAC.preserved() || PAC.preservedSet<AllAnalysesOn<Function>>() ||
76  PAC.preservedSet<CFGAnalyses>());
77 }
79 AnalysisKey DominanceFrontierAnalysis::Key;
85  return DF;
86 }
89  : OS(OS) {}
93  OS << "DominanceFrontier for function: " << F.getName() << "\n";
96  return PreservedAnalyses::all();
97 }
static PassRegistry * getPassRegistry()
getPassRegistry - Access the global registry object, which is automatically initialized at applicatio...
PassT::Result & getResult(IRUnitT &IR, ExtraArgTs... ExtraArgs)
Get the result of an analysis pass for a given IR unit.
Definition: PassManager.h:770
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
INITIALIZE_PASS_BEGIN(DominanceFrontierWrapperPass, "domfrontier", "Dominance Frontier Construction", true, true) INITIALIZE_PASS_END(DominanceFrontierWrapperPass
A Module instance is used to store all the information related to an LLVM module. ...
Definition: Module.h:64
Analysis pass which computes a DominatorTree.
Definition: Dominators.h:231
PreservedAnalysisChecker getChecker() const
Build a checker for this PreservedAnalyses and the specified analysis type.
Definition: PassManager.h:305
AnalysisUsage & addRequired()
Definition: PassSupport.h:51
void print(raw_ostream &OS) const
print - Convert to human readable form
PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM)
Analysis pass which computes a DominanceFrontier.
Definition: Compiler.h:74
Dominance Frontier Construction
void getAnalysisUsage(AnalysisUsage &AU) const override
getAnalysisUsage - This function should be overriden by passes that need analysis information to do t...
A set of analyses that are preserved following a run of a transformation pass.
Definition: PassManager.h:154
Represent the analysis usage information of a pass.
FunctionPass class - This class is used to implement most global optimizations.
Definition: Pass.h:285
static void print(raw_ostream &Out, object::Archive::Kind Kind, T Val)
static PreservedAnalyses all()
Construct a special preserved set that preserves all passes.
Definition: PassManager.h:160
INITIALIZE_PASS_END(RegBankSelect, DEBUG_TYPE, "Assign register bank of generic virtual registers", false, false) RegBankSelect
void initializeDominanceFrontierWrapperPassPass(PassRegistry &)
DominanceFrontier run(Function &F, FunctionAnalysisManager &AM)
Run the analysis pass over a function and produce a dominator tree.
raw_ostream & dbgs()
dbgs() - This returns a reference to a raw_ostream for debugging messages.
Definition: Debug.cpp:133
void print(raw_ostream &OS, const Module *=nullptr) const override
print - Print out the internal state of the pass.
bool runOnFunction(Function &) override
runOnFunction - Virtual method overriden by subclasses to do the per-function processing of the pass...
bool invalidate(Function &F, const PreservedAnalyses &PA, FunctionAnalysisManager::Invalidator &)
Handle invalidation explicitly.
void setPreservesAll()
Set by analyses that do not transform their input at all.
Represents analyses that only rely on functions&#39; control flow.
Definition: PassManager.h:115
void releaseMemory() override
releaseMemory() - This member can be implemented by a pass if it wants to be able to release its memo...
StringRef getName() const
Return a constant reference to the value&#39;s name.
Definition: Value.cpp:224
API to communicate dependencies between analyses during invalidation.
Definition: PassManager.h:642
This templated class represents "all analyses that operate over <a particular IR unit>" (e...
Definition: PassManager.h:92
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:46
Dominance Frontier true
A container for analyses that lazily runs them and caches their results.
Legacy analysis pass which computes a DominatorTree.
Definition: Dominators.h:260
This header defines various interfaces for pass management in LLVM.
A special type used by analysis passes to provide an address that identifies that particular analysis...
Definition: PassManager.h:71