1 //===- llvm/PassAnalysisSupport.h - Analysis Pass Support code ---*- C++ -*-==//
3 // This file defines stuff that is used to define and "use" Analysis Passes.
4 // This file is automatically #included by Pass.h, so:
6 // NO .CPP FILES SHOULD INCLUDE THIS FILE DIRECTLY
8 // Instead, #include Pass.h
10 //===----------------------------------------------------------------------===//
12 #ifndef LLVM_PASS_ANALYSIS_SUPPORT_H
13 #define LLVM_PASS_ANALYSIS_SUPPORT_H
15 // No need to include Pass.h, we are being included by it!
19 //===----------------------------------------------------------------------===//
20 // AnalysisUsage - Represent the analysis usage information of a pass. This
21 // tracks analyses that the pass REQUIRES (must available when the pass runs),
22 // and analyses that the pass PRESERVES (the pass does not invalidate the
23 // results of these analyses). This information is provided by a pass to the
24 // Pass infrastructure through the getAnalysisUsage virtual function.
27 // Sets of analyses required and preserved by a pass
28 std::vector<AnalysisID> Required, Preserved;
31 AnalysisUsage() : PreservesAll(false) {}
33 // addRequired - Add the specified ID to the required set of the usage info
36 AnalysisUsage &addRequiredID(AnalysisID ID) {
37 Required.push_back(ID);
40 template<class PassClass>
41 AnalysisUsage &addRequired() {
42 Required.push_back(PassClass::ID);
46 // addPreserved - Add the specified ID to the set of analyses preserved by
49 AnalysisUsage &addPreservedID(AnalysisID ID) {
50 Preserved.push_back(ID);
54 template<class PassClass>
55 AnalysisUsage &addPreserved() {
56 Preserved.push_back(PassClass::ID);
60 // setPreservesAll - Set by analyses that do not transform their input at all
61 void setPreservesAll() { PreservesAll = true; }
62 bool preservesAll() const { return PreservesAll; }
64 // preservesCFG - This function should be called by the pass, iff they do not:
66 // 1. Add or remove basic blocks from the function
67 // 2. Modify terminator instructions in any way.
69 // This function annotates the AnalysisUsage info object to say that analyses
70 // that only depend on the CFG are preserved by this pass.
74 const std::vector<AnalysisID> &getRequiredSet() const { return Required; }
75 const std::vector<AnalysisID> &getPreservedSet() const { return Preserved; }
80 //===----------------------------------------------------------------------===//
81 // AnalysisResolver - Simple interface implemented by PassManager objects that
82 // is used to pull analysis information out of them.
84 struct AnalysisResolver {
85 virtual Pass *getAnalysisOrNullUp(AnalysisID ID) const = 0;
86 virtual Pass *getAnalysisOrNullDown(AnalysisID ID) const = 0;
87 Pass *getAnalysis(AnalysisID ID) {
88 Pass *Result = getAnalysisOrNullUp(ID);
89 assert(Result && "Pass has an incorrect analysis uses set!");
93 // getAnalysisToUpdate - Return an analysis result or null if it doesn't exist
94 Pass *getAnalysisToUpdate(AnalysisID ID) {
95 return getAnalysisOrNullUp(ID);
98 // Methods for introspecting into pass manager objects...
99 virtual unsigned getDepth() const = 0;
100 virtual unsigned getNumContainedPasses() const = 0;
101 virtual const Pass *getContainedPass(unsigned N) const = 0;
103 virtual void markPassUsed(AnalysisID P, Pass *User) = 0;
105 void startPass(Pass *P) {}
106 void endPass(Pass *P) {}
108 void setAnalysisResolver(Pass *P, AnalysisResolver *AR);