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Make functions that preserve the CFG not invalidate analyses that only depend

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on the CFG of a function


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2506 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-05-06 19:31:52 +00:00
parent 4445519fab
commit 27ad137d5e
1 changed files with 28 additions and 1 deletions
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29
lib/VMCore/Pass.cpp
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@ -18,14 +18,37 @@
#include <sys/time.h>
#include <stdio.h>
//===----------------------------------------------------------------------===//
// AnalysisID Class Implementation
//
static std::vector<AnalysisID> CFGOnlyAnalyses;
// Source of unique analysis ID #'s.
unsigned AnalysisID::NextID = 0;
AnalysisID::AnalysisID(const AnalysisID &AID, bool DependsOnlyOnCFG) {
ID = AID.ID; // Implement the copy ctor part...
Constructor = AID.Constructor;
// If this analysis only depends on the CFG of the function, add it to the CFG
// only list...
if (DependsOnlyOnCFG)
CFGOnlyAnalyses.push_back(AID);
}
//===----------------------------------------------------------------------===//
// AnalysisResolver Class Implementation
//
void AnalysisResolver::setAnalysisResolver(Pass *P, AnalysisResolver *AR) {
assert(P->Resolver == 0 && "Pass already in a PassManager!");
P->Resolver = AR;
}
//===----------------------------------------------------------------------===//
// AnalysisUsage Class Implementation
//
// preservesCFG - This function should be called to by the pass, iff they do
// not:
@ -37,7 +60,11 @@ void AnalysisResolver::setAnalysisResolver(Pass *P, AnalysisResolver *AR) {
// that only depend on the CFG are preserved by this pass.
//
void AnalysisUsage::preservesCFG() {
// FIXME: implement preservesCFG
// Since this transformation doesn't modify the CFG, it preserves all analyses
// that only depend on the CFG (like dominators, loop info, etc...)
//
Preserved.insert(Preserved.end(),
CFGOnlyAnalyses.begin(), CFGOnlyAnalyses.end());
}