mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236023 91177308-0d34-0410-b5e6-96231b3b80d8
584 lines
20 KiB
C++
584 lines
20 KiB
C++
//===- AliasAnalysis.cpp - Generic Alias Analysis Interface Implementation -==//
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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 implements the generic AliasAnalysis interface which is used as the
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// common interface used by all clients and implementations of alias analysis.
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//
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// This file also implements the default version of the AliasAnalysis interface
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// that is to be used when no other implementation is specified. This does some
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// simple tests that detect obvious cases: two different global pointers cannot
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// alias, a global cannot alias a malloc, two different mallocs cannot alias,
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// etc.
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//
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// This alias analysis implementation really isn't very good for anything, but
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// it is very fast, and makes a nice clean default implementation. Because it
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// handles lots of little corner cases, other, more complex, alias analysis
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// implementations may choose to rely on this pass to resolve these simple and
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// easy cases.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/AliasAnalysis.h"
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#include "llvm/Analysis/CFG.h"
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#include "llvm/Analysis/CaptureTracking.h"
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#include "llvm/Analysis/TargetLibraryInfo.h"
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#include "llvm/Analysis/ValueTracking.h"
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#include "llvm/IR/BasicBlock.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/Dominators.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/IntrinsicInst.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Type.h"
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#include "llvm/Pass.h"
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using namespace llvm;
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// Register the AliasAnalysis interface, providing a nice name to refer to.
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INITIALIZE_ANALYSIS_GROUP(AliasAnalysis, "Alias Analysis", NoAA)
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char AliasAnalysis::ID = 0;
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//===----------------------------------------------------------------------===//
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// Default chaining methods
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//===----------------------------------------------------------------------===//
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AliasAnalysis::AliasResult
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AliasAnalysis::alias(const Location &LocA, const Location &LocB) {
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assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
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return AA->alias(LocA, LocB);
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}
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bool AliasAnalysis::pointsToConstantMemory(const Location &Loc,
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bool OrLocal) {
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assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
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return AA->pointsToConstantMemory(Loc, OrLocal);
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}
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AliasAnalysis::Location
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AliasAnalysis::getArgLocation(ImmutableCallSite CS, unsigned ArgIdx,
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AliasAnalysis::ModRefResult &Mask) {
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assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
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return AA->getArgLocation(CS, ArgIdx, Mask);
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}
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void AliasAnalysis::deleteValue(Value *V) {
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assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
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AA->deleteValue(V);
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}
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void AliasAnalysis::copyValue(Value *From, Value *To) {
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assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
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AA->copyValue(From, To);
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}
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void AliasAnalysis::addEscapingUse(Use &U) {
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assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
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AA->addEscapingUse(U);
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}
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AliasAnalysis::ModRefResult
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AliasAnalysis::getModRefInfo(Instruction *I, ImmutableCallSite Call) {
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// We may have two calls
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if (auto CS = ImmutableCallSite(I)) {
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// Check if the two calls modify the same memory
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return getModRefInfo(Call, CS);
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} else {
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// Otherwise, check if the call modifies or references the
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// location this memory access defines. The best we can say
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// is that if the call references what this instruction
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// defines, it must be clobbered by this location.
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const AliasAnalysis::Location DefLoc = AA->getLocation(I);
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if (getModRefInfo(Call, DefLoc) != AliasAnalysis::NoModRef)
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return AliasAnalysis::ModRef;
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}
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return AliasAnalysis::NoModRef;
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}
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AliasAnalysis::ModRefResult
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AliasAnalysis::getModRefInfo(ImmutableCallSite CS,
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const Location &Loc) {
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assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
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ModRefBehavior MRB = getModRefBehavior(CS);
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if (MRB == DoesNotAccessMemory)
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return NoModRef;
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ModRefResult Mask = ModRef;
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if (onlyReadsMemory(MRB))
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Mask = Ref;
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if (onlyAccessesArgPointees(MRB)) {
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bool doesAlias = false;
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ModRefResult AllArgsMask = NoModRef;
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if (doesAccessArgPointees(MRB)) {
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for (ImmutableCallSite::arg_iterator AI = CS.arg_begin(), AE = CS.arg_end();
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AI != AE; ++AI) {
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const Value *Arg = *AI;
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if (!Arg->getType()->isPointerTy())
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continue;
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ModRefResult ArgMask;
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Location CSLoc =
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getArgLocation(CS, (unsigned) std::distance(CS.arg_begin(), AI),
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ArgMask);
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if (!isNoAlias(CSLoc, Loc)) {
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doesAlias = true;
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AllArgsMask = ModRefResult(AllArgsMask | ArgMask);
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}
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}
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}
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if (!doesAlias)
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return NoModRef;
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Mask = ModRefResult(Mask & AllArgsMask);
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}
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// If Loc is a constant memory location, the call definitely could not
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// modify the memory location.
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if ((Mask & Mod) && pointsToConstantMemory(Loc))
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Mask = ModRefResult(Mask & ~Mod);
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// If this is the end of the chain, don't forward.
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if (!AA) return Mask;
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// Otherwise, fall back to the next AA in the chain. But we can merge
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// in any mask we've managed to compute.
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return ModRefResult(AA->getModRefInfo(CS, Loc) & Mask);
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}
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AliasAnalysis::ModRefResult
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AliasAnalysis::getModRefInfo(ImmutableCallSite CS1, ImmutableCallSite CS2) {
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assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
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// If CS1 or CS2 are readnone, they don't interact.
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ModRefBehavior CS1B = getModRefBehavior(CS1);
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if (CS1B == DoesNotAccessMemory) return NoModRef;
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ModRefBehavior CS2B = getModRefBehavior(CS2);
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if (CS2B == DoesNotAccessMemory) return NoModRef;
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// If they both only read from memory, there is no dependence.
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if (onlyReadsMemory(CS1B) && onlyReadsMemory(CS2B))
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return NoModRef;
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AliasAnalysis::ModRefResult Mask = ModRef;
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// If CS1 only reads memory, the only dependence on CS2 can be
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// from CS1 reading memory written by CS2.
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if (onlyReadsMemory(CS1B))
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Mask = ModRefResult(Mask & Ref);
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// If CS2 only access memory through arguments, accumulate the mod/ref
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// information from CS1's references to the memory referenced by
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// CS2's arguments.
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if (onlyAccessesArgPointees(CS2B)) {
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AliasAnalysis::ModRefResult R = NoModRef;
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if (doesAccessArgPointees(CS2B)) {
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for (ImmutableCallSite::arg_iterator
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I = CS2.arg_begin(), E = CS2.arg_end(); I != E; ++I) {
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const Value *Arg = *I;
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if (!Arg->getType()->isPointerTy())
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continue;
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ModRefResult ArgMask;
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Location CS2Loc =
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getArgLocation(CS2, (unsigned) std::distance(CS2.arg_begin(), I),
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ArgMask);
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// ArgMask indicates what CS2 might do to CS2Loc, and the dependence of
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// CS1 on that location is the inverse.
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if (ArgMask == Mod)
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ArgMask = ModRef;
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else if (ArgMask == Ref)
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ArgMask = Mod;
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R = ModRefResult((R | (getModRefInfo(CS1, CS2Loc) & ArgMask)) & Mask);
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if (R == Mask)
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break;
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}
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}
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return R;
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}
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// If CS1 only accesses memory through arguments, check if CS2 references
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// any of the memory referenced by CS1's arguments. If not, return NoModRef.
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if (onlyAccessesArgPointees(CS1B)) {
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AliasAnalysis::ModRefResult R = NoModRef;
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if (doesAccessArgPointees(CS1B)) {
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for (ImmutableCallSite::arg_iterator
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I = CS1.arg_begin(), E = CS1.arg_end(); I != E; ++I) {
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const Value *Arg = *I;
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if (!Arg->getType()->isPointerTy())
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continue;
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ModRefResult ArgMask;
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Location CS1Loc = getArgLocation(
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CS1, (unsigned)std::distance(CS1.arg_begin(), I), ArgMask);
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// ArgMask indicates what CS1 might do to CS1Loc; if CS1 might Mod
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// CS1Loc, then we care about either a Mod or a Ref by CS2. If CS1
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// might Ref, then we care only about a Mod by CS2.
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ModRefResult ArgR = getModRefInfo(CS2, CS1Loc);
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if (((ArgMask & Mod) != NoModRef && (ArgR & ModRef) != NoModRef) ||
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((ArgMask & Ref) != NoModRef && (ArgR & Mod) != NoModRef))
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R = ModRefResult((R | ArgMask) & Mask);
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if (R == Mask)
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break;
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}
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}
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return R;
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}
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// If this is the end of the chain, don't forward.
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if (!AA) return Mask;
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// Otherwise, fall back to the next AA in the chain. But we can merge
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// in any mask we've managed to compute.
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return ModRefResult(AA->getModRefInfo(CS1, CS2) & Mask);
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}
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AliasAnalysis::ModRefBehavior
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AliasAnalysis::getModRefBehavior(ImmutableCallSite CS) {
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assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
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ModRefBehavior Min = UnknownModRefBehavior;
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// Call back into the alias analysis with the other form of getModRefBehavior
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// to see if it can give a better response.
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if (const Function *F = CS.getCalledFunction())
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Min = getModRefBehavior(F);
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// If this is the end of the chain, don't forward.
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if (!AA) return Min;
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// Otherwise, fall back to the next AA in the chain. But we can merge
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// in any result we've managed to compute.
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return ModRefBehavior(AA->getModRefBehavior(CS) & Min);
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}
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AliasAnalysis::ModRefBehavior
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AliasAnalysis::getModRefBehavior(const Function *F) {
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assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
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return AA->getModRefBehavior(F);
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}
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//===----------------------------------------------------------------------===//
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// AliasAnalysis non-virtual helper method implementation
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//===----------------------------------------------------------------------===//
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AliasAnalysis::Location AliasAnalysis::getLocation(const LoadInst *LI) {
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AAMDNodes AATags;
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LI->getAAMetadata(AATags);
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return Location(LI->getPointerOperand(),
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getTypeStoreSize(LI->getType()), AATags);
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}
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AliasAnalysis::Location AliasAnalysis::getLocation(const StoreInst *SI) {
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AAMDNodes AATags;
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SI->getAAMetadata(AATags);
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return Location(SI->getPointerOperand(),
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getTypeStoreSize(SI->getValueOperand()->getType()), AATags);
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}
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AliasAnalysis::Location AliasAnalysis::getLocation(const VAArgInst *VI) {
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AAMDNodes AATags;
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VI->getAAMetadata(AATags);
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return Location(VI->getPointerOperand(), UnknownSize, AATags);
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}
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AliasAnalysis::Location
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AliasAnalysis::getLocation(const AtomicCmpXchgInst *CXI) {
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AAMDNodes AATags;
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CXI->getAAMetadata(AATags);
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return Location(CXI->getPointerOperand(),
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getTypeStoreSize(CXI->getCompareOperand()->getType()),
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AATags);
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}
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AliasAnalysis::Location
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AliasAnalysis::getLocation(const AtomicRMWInst *RMWI) {
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AAMDNodes AATags;
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RMWI->getAAMetadata(AATags);
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return Location(RMWI->getPointerOperand(),
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getTypeStoreSize(RMWI->getValOperand()->getType()), AATags);
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}
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AliasAnalysis::Location
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AliasAnalysis::getLocationForSource(const MemTransferInst *MTI) {
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uint64_t Size = UnknownSize;
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if (ConstantInt *C = dyn_cast<ConstantInt>(MTI->getLength()))
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Size = C->getValue().getZExtValue();
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// memcpy/memmove can have AA tags. For memcpy, they apply
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// to both the source and the destination.
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AAMDNodes AATags;
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MTI->getAAMetadata(AATags);
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return Location(MTI->getRawSource(), Size, AATags);
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}
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AliasAnalysis::Location
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AliasAnalysis::getLocationForDest(const MemIntrinsic *MTI) {
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uint64_t Size = UnknownSize;
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if (ConstantInt *C = dyn_cast<ConstantInt>(MTI->getLength()))
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Size = C->getValue().getZExtValue();
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// memcpy/memmove can have AA tags. For memcpy, they apply
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// to both the source and the destination.
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AAMDNodes AATags;
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MTI->getAAMetadata(AATags);
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return Location(MTI->getRawDest(), Size, AATags);
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}
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AliasAnalysis::ModRefResult
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AliasAnalysis::getModRefInfo(const LoadInst *L, const Location &Loc) {
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// Be conservative in the face of volatile/atomic.
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if (!L->isUnordered())
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return ModRef;
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// If the load address doesn't alias the given address, it doesn't read
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// or write the specified memory.
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if (Loc.Ptr && !alias(getLocation(L), Loc))
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return NoModRef;
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// Otherwise, a load just reads.
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return Ref;
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}
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AliasAnalysis::ModRefResult
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AliasAnalysis::getModRefInfo(const StoreInst *S, const Location &Loc) {
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// Be conservative in the face of volatile/atomic.
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if (!S->isUnordered())
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return ModRef;
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if (Loc.Ptr) {
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// If the store address cannot alias the pointer in question, then the
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// specified memory cannot be modified by the store.
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if (!alias(getLocation(S), Loc))
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return NoModRef;
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// If the pointer is a pointer to constant memory, then it could not have
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// been modified by this store.
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if (pointsToConstantMemory(Loc))
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return NoModRef;
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}
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// Otherwise, a store just writes.
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return Mod;
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}
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AliasAnalysis::ModRefResult
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AliasAnalysis::getModRefInfo(const VAArgInst *V, const Location &Loc) {
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if (Loc.Ptr) {
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// If the va_arg address cannot alias the pointer in question, then the
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// specified memory cannot be accessed by the va_arg.
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if (!alias(getLocation(V), Loc))
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return NoModRef;
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// If the pointer is a pointer to constant memory, then it could not have
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// been modified by this va_arg.
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if (pointsToConstantMemory(Loc))
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return NoModRef;
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}
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// Otherwise, a va_arg reads and writes.
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return ModRef;
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}
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AliasAnalysis::ModRefResult
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AliasAnalysis::getModRefInfo(const AtomicCmpXchgInst *CX, const Location &Loc) {
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// Acquire/Release cmpxchg has properties that matter for arbitrary addresses.
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if (CX->getSuccessOrdering() > Monotonic)
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return ModRef;
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// If the cmpxchg address does not alias the location, it does not access it.
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if (Loc.Ptr && !alias(getLocation(CX), Loc))
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return NoModRef;
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return ModRef;
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}
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AliasAnalysis::ModRefResult
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AliasAnalysis::getModRefInfo(const AtomicRMWInst *RMW, const Location &Loc) {
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// Acquire/Release atomicrmw has properties that matter for arbitrary addresses.
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if (RMW->getOrdering() > Monotonic)
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return ModRef;
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// If the atomicrmw address does not alias the location, it does not access it.
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if (Loc.Ptr && !alias(getLocation(RMW), Loc))
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return NoModRef;
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return ModRef;
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}
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// FIXME: this is really just shoring-up a deficiency in alias analysis.
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// BasicAA isn't willing to spend linear time determining whether an alloca
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// was captured before or after this particular call, while we are. However,
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// with a smarter AA in place, this test is just wasting compile time.
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AliasAnalysis::ModRefResult
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AliasAnalysis::callCapturesBefore(const Instruction *I,
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const AliasAnalysis::Location &MemLoc,
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DominatorTree *DT) {
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if (!DT)
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return AliasAnalysis::ModRef;
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const Value *Object = GetUnderlyingObject(MemLoc.Ptr, *DL);
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if (!isIdentifiedObject(Object) || isa<GlobalValue>(Object) ||
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isa<Constant>(Object))
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return AliasAnalysis::ModRef;
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ImmutableCallSite CS(I);
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if (!CS.getInstruction() || CS.getInstruction() == Object)
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return AliasAnalysis::ModRef;
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if (llvm::PointerMayBeCapturedBefore(Object, /* ReturnCaptures */ true,
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/* StoreCaptures */ true, I, DT,
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/* include Object */ true))
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return AliasAnalysis::ModRef;
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unsigned ArgNo = 0;
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AliasAnalysis::ModRefResult R = AliasAnalysis::NoModRef;
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for (ImmutableCallSite::arg_iterator CI = CS.arg_begin(), CE = CS.arg_end();
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CI != CE; ++CI, ++ArgNo) {
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// Only look at the no-capture or byval pointer arguments. If this
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// pointer were passed to arguments that were neither of these, then it
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// couldn't be no-capture.
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if (!(*CI)->getType()->isPointerTy() ||
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(!CS.doesNotCapture(ArgNo) && !CS.isByValArgument(ArgNo)))
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continue;
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// If this is a no-capture pointer argument, see if we can tell that it
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// is impossible to alias the pointer we're checking. If not, we have to
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// assume that the call could touch the pointer, even though it doesn't
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// escape.
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if (isNoAlias(AliasAnalysis::Location(*CI),
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AliasAnalysis::Location(Object)))
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continue;
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if (CS.doesNotAccessMemory(ArgNo))
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continue;
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if (CS.onlyReadsMemory(ArgNo)) {
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R = AliasAnalysis::Ref;
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continue;
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}
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return AliasAnalysis::ModRef;
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}
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return R;
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}
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// AliasAnalysis destructor: DO NOT move this to the header file for
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// AliasAnalysis or else clients of the AliasAnalysis class may not depend on
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// the AliasAnalysis.o file in the current .a file, causing alias analysis
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// support to not be included in the tool correctly!
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//
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AliasAnalysis::~AliasAnalysis() {}
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/// InitializeAliasAnalysis - Subclasses must call this method to initialize the
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/// AliasAnalysis interface before any other methods are called.
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///
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void AliasAnalysis::InitializeAliasAnalysis(Pass *P, const DataLayout *NewDL) {
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DL = NewDL;
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auto *TLIP = P->getAnalysisIfAvailable<TargetLibraryInfoWrapperPass>();
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TLI = TLIP ? &TLIP->getTLI() : nullptr;
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AA = &P->getAnalysis<AliasAnalysis>();
|
|
}
|
|
|
|
// getAnalysisUsage - All alias analysis implementations should invoke this
|
|
// directly (using AliasAnalysis::getAnalysisUsage(AU)).
|
|
void AliasAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
|
|
AU.addRequired<AliasAnalysis>(); // All AA's chain
|
|
}
|
|
|
|
/// getTypeStoreSize - Return the DataLayout store size for the given type,
|
|
/// if known, or a conservative value otherwise.
|
|
///
|
|
uint64_t AliasAnalysis::getTypeStoreSize(Type *Ty) {
|
|
return DL ? DL->getTypeStoreSize(Ty) : UnknownSize;
|
|
}
|
|
|
|
/// canBasicBlockModify - Return true if it is possible for execution of the
|
|
/// specified basic block to modify the location Loc.
|
|
///
|
|
bool AliasAnalysis::canBasicBlockModify(const BasicBlock &BB,
|
|
const Location &Loc) {
|
|
return canInstructionRangeModRef(BB.front(), BB.back(), Loc, Mod);
|
|
}
|
|
|
|
/// canInstructionRangeModRef - Return true if it is possible for the
|
|
/// execution of the specified instructions to mod\ref (according to the
|
|
/// mode) the location Loc. The instructions to consider are all
|
|
/// of the instructions in the range of [I1,I2] INCLUSIVE.
|
|
/// I1 and I2 must be in the same basic block.
|
|
bool AliasAnalysis::canInstructionRangeModRef(const Instruction &I1,
|
|
const Instruction &I2,
|
|
const Location &Loc,
|
|
const ModRefResult Mode) {
|
|
assert(I1.getParent() == I2.getParent() &&
|
|
"Instructions not in same basic block!");
|
|
BasicBlock::const_iterator I = &I1;
|
|
BasicBlock::const_iterator E = &I2;
|
|
++E; // Convert from inclusive to exclusive range.
|
|
|
|
for (; I != E; ++I) // Check every instruction in range
|
|
if (getModRefInfo(I, Loc) & Mode)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
/// isNoAliasCall - Return true if this pointer is returned by a noalias
|
|
/// function.
|
|
bool llvm::isNoAliasCall(const Value *V) {
|
|
if (isa<CallInst>(V) || isa<InvokeInst>(V))
|
|
return ImmutableCallSite(cast<Instruction>(V))
|
|
.paramHasAttr(0, Attribute::NoAlias);
|
|
return false;
|
|
}
|
|
|
|
/// isNoAliasArgument - Return true if this is an argument with the noalias
|
|
/// attribute.
|
|
bool llvm::isNoAliasArgument(const Value *V)
|
|
{
|
|
if (const Argument *A = dyn_cast<Argument>(V))
|
|
return A->hasNoAliasAttr();
|
|
return false;
|
|
}
|
|
|
|
/// isIdentifiedObject - Return true if this pointer refers to a distinct and
|
|
/// identifiable object. This returns true for:
|
|
/// Global Variables and Functions (but not Global Aliases)
|
|
/// Allocas and Mallocs
|
|
/// ByVal and NoAlias Arguments
|
|
/// NoAlias returns
|
|
///
|
|
bool llvm::isIdentifiedObject(const Value *V) {
|
|
if (isa<AllocaInst>(V))
|
|
return true;
|
|
if (isa<GlobalValue>(V) && !isa<GlobalAlias>(V))
|
|
return true;
|
|
if (isNoAliasCall(V))
|
|
return true;
|
|
if (const Argument *A = dyn_cast<Argument>(V))
|
|
return A->hasNoAliasAttr() || A->hasByValAttr();
|
|
return false;
|
|
}
|
|
|
|
/// isIdentifiedFunctionLocal - Return true if V is umabigously identified
|
|
/// at the function-level. Different IdentifiedFunctionLocals can't alias.
|
|
/// Further, an IdentifiedFunctionLocal can not alias with any function
|
|
/// arguments other than itself, which is not necessarily true for
|
|
/// IdentifiedObjects.
|
|
bool llvm::isIdentifiedFunctionLocal(const Value *V)
|
|
{
|
|
return isa<AllocaInst>(V) || isNoAliasCall(V) || isNoAliasArgument(V);
|
|
}
|