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https://github.com/c64scene-ar/llvm-6502.git
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529919ff31
Summary: Now that the DataLayout is a mandatory part of the module, let's start cleaning the codebase. This patch is a first attempt at doing that. This patch is not exactly NFC as for instance some places were passing a nullptr instead of the DataLayout, possibly just because there was a default value on the DataLayout argument to many functions in the API. Even though it is not purely NFC, there is no change in the validation. I turned as many pointer to DataLayout to references, this helped figuring out all the places where a nullptr could come up. I had initially a local version of this patch broken into over 30 independant, commits but some later commit were cleaning the API and touching part of the code modified in the previous commits, so it seemed cleaner without the intermediate state. Test Plan: Reviewers: echristo Subscribers: llvm-commits From: Mehdi Amini <mehdi.amini@apple.com> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231740 91177308-0d34-0410-b5e6-96231b3b80d8
92 lines
3.1 KiB
C++
92 lines
3.1 KiB
C++
//===- LazyValueInfo.h - Value constraint analysis --------------*- C++ -*-===//
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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 interface for lazy computation of value constraint
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// information.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_LAZYVALUEINFO_H
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#define LLVM_ANALYSIS_LAZYVALUEINFO_H
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#include "llvm/Pass.h"
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namespace llvm {
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class AssumptionCache;
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class Constant;
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class DataLayout;
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class DominatorTree;
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class Instruction;
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class TargetLibraryInfo;
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class Value;
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/// This pass computes, caches, and vends lazy value constraint information.
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class LazyValueInfo : public FunctionPass {
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AssumptionCache *AC;
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class TargetLibraryInfo *TLI;
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DominatorTree *DT;
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void *PImpl;
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LazyValueInfo(const LazyValueInfo&) = delete;
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void operator=(const LazyValueInfo&) = delete;
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public:
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static char ID;
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LazyValueInfo() : FunctionPass(ID), PImpl(nullptr) {
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initializeLazyValueInfoPass(*PassRegistry::getPassRegistry());
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}
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~LazyValueInfo() { assert(!PImpl && "releaseMemory not called"); }
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/// This is used to return true/false/dunno results.
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enum Tristate {
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Unknown = -1, False = 0, True = 1
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};
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// Public query interface.
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/// Determine whether the specified value comparison with a constant is known
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/// to be true or false on the specified CFG edge.
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/// Pred is a CmpInst predicate.
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Tristate getPredicateOnEdge(unsigned Pred, Value *V, Constant *C,
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BasicBlock *FromBB, BasicBlock *ToBB,
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Instruction *CxtI = nullptr);
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/// Determine whether the specified value comparison with a constant is known
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/// to be true or false at the specified instruction
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/// (from an assume intrinsic). Pred is a CmpInst predicate.
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Tristate getPredicateAt(unsigned Pred, Value *V, Constant *C,
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Instruction *CxtI);
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/// Determine whether the specified value is known to be a
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/// constant at the end of the specified block. Return null if not.
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Constant *getConstant(Value *V, BasicBlock *BB, Instruction *CxtI = nullptr);
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/// Determine whether the specified value is known to be a
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/// constant on the specified edge. Return null if not.
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Constant *getConstantOnEdge(Value *V, BasicBlock *FromBB, BasicBlock *ToBB,
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Instruction *CxtI = nullptr);
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/// Inform the analysis cache that we have threaded an edge from
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/// PredBB to OldSucc to be from PredBB to NewSucc instead.
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void threadEdge(BasicBlock *PredBB, BasicBlock *OldSucc, BasicBlock *NewSucc);
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/// Inform the analysis cache that we have erased a block.
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void eraseBlock(BasicBlock *BB);
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// Implementation boilerplate.
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void getAnalysisUsage(AnalysisUsage &AU) const override;
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void releaseMemory() override;
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bool runOnFunction(Function &F) override;
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};
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} // end namespace llvm
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#endif
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