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81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
//===- LibCallAliasAnalysis.h - Implement AliasAnalysis for libcalls ------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the LibCallAliasAnalysis class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_LIBCALLALIASANALYSIS_H
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#define LLVM_ANALYSIS_LIBCALLALIASANALYSIS_H
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#include "llvm/Analysis/AliasAnalysis.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Pass.h"
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namespace llvm {
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class LibCallInfo;
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struct LibCallFunctionInfo;
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/// Alias analysis driven from LibCallInfo.
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struct LibCallAliasAnalysis : public FunctionPass, public AliasAnalysis {
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static char ID; // Class identification
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LibCallInfo *LCI;
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explicit LibCallAliasAnalysis(LibCallInfo *LC = nullptr)
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: FunctionPass(ID), LCI(LC) {
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initializeLibCallAliasAnalysisPass(*PassRegistry::getPassRegistry());
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}
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explicit LibCallAliasAnalysis(char &ID, LibCallInfo *LC)
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: FunctionPass(ID), LCI(LC) {
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initializeLibCallAliasAnalysisPass(*PassRegistry::getPassRegistry());
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}
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~LibCallAliasAnalysis() override;
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ModRefInfo getModRefInfo(ImmutableCallSite CS,
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const MemoryLocation &Loc) override;
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ModRefInfo getModRefInfo(ImmutableCallSite CS1,
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ImmutableCallSite CS2) override {
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// TODO: Could compare two direct calls against each other if we cared to.
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return AliasAnalysis::getModRefInfo(CS1, CS2);
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}
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void getAnalysisUsage(AnalysisUsage &AU) const override;
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bool runOnFunction(Function &F) override;
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/// This method is used when a pass implements an analysis interface through
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/// multiple inheritance.
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///
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/// If needed, it should override this to adjust the this pointer as needed
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/// for the specified pass info.
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void *getAdjustedAnalysisPointer(const void *PI) override {
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if (PI == &AliasAnalysis::ID)
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return (AliasAnalysis *)this;
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return this;
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}
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private:
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ModRefInfo AnalyzeLibCallDetails(const LibCallFunctionInfo *FI,
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ImmutableCallSite CS,
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const MemoryLocation &Loc);
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};
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/// Create an alias analysis pass that knows about the semantics of a set of
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/// libcalls specified by LCI.
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///
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/// The newly constructed pass takes ownership of the pointer that is provided.
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FunctionPass *createLibCallAliasAnalysisPass(LibCallInfo *LCI);
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} // End of llvm namespace
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#endif
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