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Make functions that preserve the CFG not invalidate analyses that only depend
on the CFG of a function git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2506 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -18,14 +18,37 @@
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#include <sys/time.h>
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#include <stdio.h>
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//===----------------------------------------------------------------------===//
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// AnalysisID Class Implementation
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//
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static std::vector<AnalysisID> CFGOnlyAnalyses;
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// Source of unique analysis ID #'s.
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unsigned AnalysisID::NextID = 0;
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AnalysisID::AnalysisID(const AnalysisID &AID, bool DependsOnlyOnCFG) {
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ID = AID.ID; // Implement the copy ctor part...
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Constructor = AID.Constructor;
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// If this analysis only depends on the CFG of the function, add it to the CFG
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// only list...
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if (DependsOnlyOnCFG)
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CFGOnlyAnalyses.push_back(AID);
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}
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//===----------------------------------------------------------------------===//
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// AnalysisResolver Class Implementation
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//
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void AnalysisResolver::setAnalysisResolver(Pass *P, AnalysisResolver *AR) {
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assert(P->Resolver == 0 && "Pass already in a PassManager!");
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P->Resolver = AR;
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}
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//===----------------------------------------------------------------------===//
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// AnalysisUsage Class Implementation
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//
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// preservesCFG - This function should be called to by the pass, iff they do
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// not:
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@ -37,7 +60,11 @@ void AnalysisResolver::setAnalysisResolver(Pass *P, AnalysisResolver *AR) {
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// that only depend on the CFG are preserved by this pass.
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//
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void AnalysisUsage::preservesCFG() {
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// FIXME: implement preservesCFG
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// Since this transformation doesn't modify the CFG, it preserves all analyses
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// that only depend on the CFG (like dominators, loop info, etc...)
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//
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Preserved.insert(Preserved.end(),
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CFGOnlyAnalyses.begin(), CFGOnlyAnalyses.end());
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}
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