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Reimplement isPotentiallyReachable to make nocapture deduction much stronger.

Browse Source 
Adds unit tests for it too.

Split BasicBlockUtils into an analysis-half and a transforms-half, and put the
analysis bits into a new Analysis/CFG.{h,cpp}. Promote isPotentiallyReachable
into llvm::isPotentiallyReachable and move it into Analysis/CFG.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187283 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2013-07-27 01:24:00 +00:00
parent 332af10901
commit 81e480463d
13 changed files with 666 additions and 142 deletions
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69
include/llvm/Analysis/CFG.h Normal file
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@ -0,0 +1,69 @@
//===-- Analysis/CFG.h - BasicBlock Analyses --------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This family of functions performs analyses on basic blocks, and instructions
// contained within basic blocks.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_CFG_H
#define LLVM_ANALYSIS_CFG_H
#include "llvm/IR/BasicBlock.h"
#include "llvm/Support/CFG.h"
namespace llvm {
class BasicBlock;
class DominatorTree;
class Function;
class Instruction;
class LoopInfo;
class TerminatorInst;
/// Analyze the specified function to find all of the loop backedges in the
/// function and return them. This is a relatively cheap (compared to
/// computing dominators and loop info) analysis.
///
/// The output is added to Result, as pairs of <from,to> edge info.
void FindFunctionBackedges(
const Function &F,
SmallVectorImpl<std::pair<const BasicBlock *, const BasicBlock *> > &
Result);
/// Search for the specified successor of basic block BB and return its position
/// in the terminator instruction's list of successors. It is an error to call
/// this with a block that is not a successor.
unsigned GetSuccessorNumber(BasicBlock *BB, BasicBlock *Succ);
/// Return true if the specified edge is a critical edge. Critical edges are
/// edges from a block with multiple successors to a block with multiple
/// predecessors.
///
bool isCriticalEdge(const TerminatorInst *TI, unsigned SuccNum,
bool AllowIdenticalEdges = false);
/// Determine whether there is a path from From to To within a single function.
/// Returns false only if we can prove that once 'From' has been executed then
/// 'To' can not be executed. Conservatively returns true.
///
/// This function is linear with respect to the number of blocks in the CFG,
/// walking down successors from From to reach To, with a fixed threshold.
/// Using DT or LI allows us to answer more quickly. LI reduces the cost of
/// an entire loop of any number of blocsk to be the same as the cost of a
/// single block. DT reduces the cost by allowing the search to terminate when
/// we find a block that dominates the block containing 'To'. DT is most useful
/// on branchy code but not loops, and LI is most useful on code with loops but
/// does not help on branchy code outside loops.
bool isPotentiallyReachable(const Instruction *From, const Instruction *To,
DominatorTree *DT = 0, LoopInfo *LI = 0);
} // End llvm namespace
#endif

22
include/llvm/Transforms/Utils/BasicBlockUtils.h
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@ -70,28 +70,6 @@ void ReplaceInstWithInst(BasicBlock::InstListType &BIL,
//
void ReplaceInstWithInst(Instruction *From, Instruction *To);
/// FindFunctionBackedges - Analyze the specified function to find all of the
/// loop backedges in the function and return them. This is a relatively cheap
/// (compared to computing dominators and loop info) analysis.
///
/// The output is added to Result, as pairs of <from,to> edge info.
void FindFunctionBackedges(const Function &F,
SmallVectorImpl<std::pair<const BasicBlock*,const BasicBlock*> > &Result);
/// GetSuccessorNumber - Search for the specified successor of basic block BB
/// and return its position in the terminator instruction's list of
/// successors. It is an error to call this with a block that is not a
/// successor.
unsigned GetSuccessorNumber(BasicBlock *BB, BasicBlock *Succ);
/// isCriticalEdge - Return true if the specified edge is a critical edge.
/// Critical edges are edges from a block with multiple successors to a block
/// with multiple predecessors.
///
bool isCriticalEdge(const TerminatorInst *TI, unsigned SuccNum,
bool AllowIdenticalEdges = false);
/// SplitCriticalEdge - If this edge is a critical edge, insert a new node to
/// split the critical edge. This will update DominatorTree and
/// DominatorFrontier information if it is available, thus calling this pass

25
lib/Analysis/AliasAnalysis.cpp
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@ -26,6 +26,7 @@
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/CaptureTracking.h"
#include "llvm/Analysis/CFG.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/BasicBlock.h"
@ -361,26 +362,6 @@ AliasAnalysis::getModRefInfo(const AtomicRMWInst *RMW, const Location &Loc) {
}
namespace {
/// Determine whether there is a path from From to To within a single
/// function. Returns false only if we can prove that once 'From' has been
/// executed then 'To' can not be executed. Conservatively returns true.
static bool isPotentiallyReachable(const BasicBlock *From,
const BasicBlock *To) {
const unsigned MaxCheck = 5;
const BasicBlock *Current = From;
for (unsigned I = 0; I < MaxCheck; I++) {
unsigned NumSuccs = Current->getTerminator()->getNumSuccessors();
if (NumSuccs > 1)
return true;
if (NumSuccs == 0)
return false;
Current = Current->getTerminator()->getSuccessor(0);
if (Current == To)
return true;
}
return true;
}
/// Only find pointer captures which happen before the given instruction. Uses
/// the dominator tree to determine whether one instruction is before another.
/// Only support the case where the Value is defined in the same basic block
@ -402,7 +383,7 @@ namespace {
// there is no need to explore the use if BeforeHere dominates use.
// Check whether there is a path from I to BeforeHere.
if (BeforeHere != I && DT->dominates(BeforeHere, I) &&
!isPotentiallyReachable(BB, BeforeHere->getParent()))
!isPotentiallyReachable(I, BeforeHere, DT))
return false;
return true;
}
@ -414,7 +395,7 @@ namespace {
if (BeforeHere != I && !DT->isReachableFromEntry(BB))
return false;
if (BeforeHere != I && DT->dominates(BeforeHere, I) &&
!isPotentiallyReachable(BB, BeforeHere->getParent()))
!isPotentiallyReachable(I, BeforeHere, DT))
return false;
Captured = true;
return true;

227
lib/Analysis/CFG.cpp Normal file
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@ -0,0 +1,227 @@
//===-- CFG.cpp - BasicBlock analysis --------------------------------------==//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This family of functions performs analyses on basic blocks, and instructions
// contained within basic blocks.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/CFG.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/LoopInfo.h"
using namespace llvm;
/// FindFunctionBackedges - Analyze the specified function to find all of the
/// loop backedges in the function and return them. This is a relatively cheap
/// (compared to computing dominators and loop info) analysis.
///
/// The output is added to Result, as pairs of <from,to> edge info.
void llvm::FindFunctionBackedges(const Function &F,
SmallVectorImpl<std::pair<const BasicBlock*,const BasicBlock*> > &Result) {
const BasicBlock *BB = &F.getEntryBlock();
if (succ_begin(BB) == succ_end(BB))
return;
SmallPtrSet<const BasicBlock*, 8> Visited;
SmallVector<std::pair<const BasicBlock*, succ_const_iterator>, 8> VisitStack;
SmallPtrSet<const BasicBlock*, 8> InStack;
Visited.insert(BB);
VisitStack.push_back(std::make_pair(BB, succ_begin(BB)));
InStack.insert(BB);
do {
std::pair<const BasicBlock*, succ_const_iterator> &Top = VisitStack.back();
const BasicBlock *ParentBB = Top.first;
succ_const_iterator &I = Top.second;
bool FoundNew = false;
while (I != succ_end(ParentBB)) {
BB = *I++;
if (Visited.insert(BB)) {
FoundNew = true;
break;
}
// Successor is in VisitStack, it's a back edge.
if (InStack.count(BB))
Result.push_back(std::make_pair(ParentBB, BB));
}
if (FoundNew) {
// Go down one level if there is a unvisited successor.
InStack.insert(BB);
VisitStack.push_back(std::make_pair(BB, succ_begin(BB)));
} else {
// Go up one level.
InStack.erase(VisitStack.pop_back_val().first);
}
} while (!VisitStack.empty());
}
/// GetSuccessorNumber - Search for the specified successor of basic block BB
/// and return its position in the terminator instruction's list of
/// successors. It is an error to call this with a block that is not a
/// successor.
unsigned llvm::GetSuccessorNumber(BasicBlock *BB, BasicBlock *Succ) {
TerminatorInst *Term = BB->getTerminator();
#ifndef NDEBUG
unsigned e = Term->getNumSuccessors();
#endif
for (unsigned i = 0; ; ++i) {
assert(i != e && "Didn't find edge?");
if (Term->getSuccessor(i) == Succ)
return i;
}
}
/// isCriticalEdge - Return true if the specified edge is a critical edge.
/// Critical edges are edges from a block with multiple successors to a block
/// with multiple predecessors.
bool llvm::isCriticalEdge(const TerminatorInst *TI, unsigned SuccNum,
bool AllowIdenticalEdges) {
assert(SuccNum < TI->getNumSuccessors() && "Illegal edge specification!");
if (TI->getNumSuccessors() == 1) return false;
const BasicBlock *Dest = TI->getSuccessor(SuccNum);
const_pred_iterator I = pred_begin(Dest), E = pred_end(Dest);
// If there is more than one predecessor, this is a critical edge...
assert(I != E && "No preds, but we have an edge to the block?");
const BasicBlock *FirstPred = *I;
++I; // Skip one edge due to the incoming arc from TI.
if (!AllowIdenticalEdges)
return I != E;
// If AllowIdenticalEdges is true, then we allow this edge to be considered
// non-critical iff all preds come from TI's block.
while (I != E) {
const BasicBlock *P = *I;
if (P != FirstPred)
return true;
// Note: leave this as is until no one ever compiles with either gcc 4.0.1
// or Xcode 2. This seems to work around the pred_iterator assert in PR 2207
E = pred_end(P);
++I;
}
return false;
}
// LoopInfo contains a mapping from basic block to the innermost loop. Find
// the outermost loop in the loop nest that contains BB.
static const Loop *getOutermostLoop(LoopInfo *LI, const BasicBlock *BB) {
const Loop *L = LI->getLoopFor(BB);
if (L) {
while (const Loop *Parent = L->getParentLoop())
L = Parent;
}
return L;
}
// True if there is a loop which contains both BB1 and BB2.
static bool loopContainsBoth(LoopInfo *LI,
const BasicBlock *BB1, const BasicBlock *BB2) {
const Loop *L1 = getOutermostLoop(LI, BB1);
const Loop *L2 = getOutermostLoop(LI, BB2);
return L1 != NULL && L1 == L2;
}
static bool isPotentiallyReachableSameBlock(const Instruction *A,
const Instruction *B,
LoopInfo *LI) {
// The same block case is special because it's the only time we're looking
// within a single block to see which comes first. Once we start looking at
// multiple blocks, the first instruction of the block is reachable, so we
// only need to determine reachability between whole blocks.
const BasicBlock *BB = A->getParent();
// If the block is in a loop then we can reach any instruction in the block
// from any other instruction in the block by going around the backedge.
// Check whether we're in a loop (or aren't sure).
// Can't be in a loop if it's the entry block -- the entry block may not
// have predecessors.
bool HasLoop = BB != &BB->getParent()->getEntryBlock();
// Can't be in a loop if LoopInfo doesn't know about it.
if (LI && HasLoop) {
HasLoop = LI->getLoopFor(BB) != 0;
}
if (HasLoop)
return true;
// Linear scan, start at 'A', see whether we hit 'B' or the end first.
for (BasicBlock::const_iterator I = A, E = BB->end(); I != E; ++I) {
if (&*I == B)
return true;
}
return false;
}
bool llvm::isPotentiallyReachable(const Instruction *A, const Instruction *B,
DominatorTree *DT, LoopInfo *LI) {
assert(A->getParent()->getParent() == B->getParent()->getParent() &&
"This analysis is function-local!");
const BasicBlock *StopBB = B->getParent();
if (A->getParent() == B->getParent())
return isPotentiallyReachableSameBlock(A, B, LI);
if (A->getParent() == &A->getParent()->getParent()->getEntryBlock())
return true;
if (B->getParent() == &A->getParent()->getParent()->getEntryBlock())
return false;
// When the stop block is unreachable, it's dominated from everywhere,
// regardless of whether there's a path between the two blocks.
if (DT && !DT->isReachableFromEntry(StopBB))
DT = 0;
// Limit the number of blocks we visit. The goal is to avoid run-away compile
// times on large CFGs without hampering sensible code. Arbitrarily chosen.
unsigned Limit = 32;
SmallSet<const BasicBlock*, 64> Visited;
SmallVector<BasicBlock*, 32> Worklist;
Worklist.push_back(const_cast<BasicBlock*>(A->getParent()));
do {
BasicBlock *BB = Worklist.pop_back_val();
if (!Visited.insert(BB))
continue;
if (BB == StopBB)
return true;
if (DT && DT->dominates(BB, StopBB))
return true;
if (LI && loopContainsBoth(LI, BB, StopBB))
return true;
if (!--Limit) {
// We haven't been able to prove it one way or the other. Conservatively
// answer true -- that there is potentially a path.
return true;
}
if (const Loop *Outer = LI ? getOutermostLoop(LI, BB) : 0) {
// All blocks in a single loop are reachable from all other blocks. From
// any of these blocks, we can skip directly to the exits of the loop,
// ignoring any other blocks inside the loop body.
Outer->getExitBlocks(Worklist);
} else {
for (succ_iterator I = succ_begin(BB), E = succ_end(BB); I != E; ++I)
Worklist.push_back(*I);
}
} while (!Worklist.empty());
// We have exhaustived all possible paths and are certain that 'To' can not
// be reached from 'From'.
return false;
}

1
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -19,6 +19,7 @@
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/BranchProbabilityInfo.h"
#include "llvm/Analysis/CFG.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/CodeGen/FastISel.h"
#include "llvm/CodeGen/FunctionLoweringInfo.h"

1
lib/Transforms/Scalar/GVN.cpp
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@ -23,6 +23,7 @@
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/CFG.h"
#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/InstructionSimplify.h"

3
lib/Transforms/Scalar/JumpThreading.cpp
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@ -19,6 +19,7 @@
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/CFG.h"
#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/Analysis/LazyValueInfo.h"
@ -1614,5 +1615,3 @@ bool JumpThreading::DuplicateCondBranchOnPHIIntoPred(BasicBlock *BB,
++NumDupes;
return true;
}

63
lib/Transforms/Utils/BasicBlockUtils.cpp
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@ -14,6 +14,7 @@
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/CFG.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/MemoryDependenceAnalysis.h"
@ -235,22 +236,6 @@ void llvm::ReplaceInstWithInst(Instruction *From, Instruction *To) {
ReplaceInstWithInst(From->getParent()->getInstList(), BI, To);
}
/// GetSuccessorNumber - Search for the specified successor of basic block BB
/// and return its position in the terminator instruction's list of
/// successors. It is an error to call this with a block that is not a
/// successor.
unsigned llvm::GetSuccessorNumber(BasicBlock *BB, BasicBlock *Succ) {
TerminatorInst *Term = BB->getTerminator();
#ifndef NDEBUG
unsigned e = Term->getNumSuccessors();
#endif
for (unsigned i = 0; ; ++i) {
assert(i != e && "Didn't find edge?");
if (Term->getSuccessor(i) == Succ)
return i;
}
}
/// SplitEdge - Split the edge connecting specified block. Pass P must
/// not be NULL.
BasicBlock *llvm::SplitEdge(BasicBlock *BB, BasicBlock *Succ, Pass *P) {
@ -598,52 +583,6 @@ void llvm::SplitLandingPadPredecessors(BasicBlock *OrigBB,
}
}
/// FindFunctionBackedges - Analyze the specified function to find all of the
/// loop backedges in the function and return them. This is a relatively cheap
/// (compared to computing dominators and loop info) analysis.
///
/// The output is added to Result, as pairs of <from,to> edge info.
void llvm::FindFunctionBackedges(const Function &F,
SmallVectorImpl<std::pair<const BasicBlock*,const BasicBlock*> > &Result) {
const BasicBlock *BB = &F.getEntryBlock();
if (succ_begin(BB) == succ_end(BB))
return;
SmallPtrSet<const BasicBlock*, 8> Visited;
SmallVector<std::pair<const BasicBlock*, succ_const_iterator>, 8> VisitStack;
SmallPtrSet<const BasicBlock*, 8> InStack;
Visited.insert(BB);
VisitStack.push_back(std::make_pair(BB, succ_begin(BB)));
InStack.insert(BB);
do {
std::pair<const BasicBlock*, succ_const_iterator> &Top = VisitStack.back();
const BasicBlock *ParentBB = Top.first;
succ_const_iterator &I = Top.second;
bool FoundNew = false;
while (I != succ_end(ParentBB)) {
BB = *I++;
if (Visited.insert(BB)) {
FoundNew = true;
break;
}
// Successor is in VisitStack, it's a back edge.
if (InStack.count(BB))
Result.push_back(std::make_pair(ParentBB, BB));
}
if (FoundNew) {
// Go down one level if there is a unvisited successor.
InStack.insert(BB);
VisitStack.push_back(std::make_pair(BB, succ_begin(BB)));
} else {
// Go up one level.
InStack.erase(VisitStack.pop_back_val().first);
}
} while (!VisitStack.empty());
}
/// FoldReturnIntoUncondBranch - This method duplicates the specified return
/// instruction into a predecessor which ends in an unconditional branch. If
/// the return instruction returns a value defined by a PHI, propagate the

34
lib/Transforms/Utils/BreakCriticalEdges.cpp
View File

@ -19,6 +19,7 @@
#include "llvm/Transforms/Scalar.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/CFG.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/ProfileInfo.h"
@ -84,39 +85,6 @@ bool BreakCriticalEdges::runOnFunction(Function &F) {
// Implementation of the external critical edge manipulation functions
//===----------------------------------------------------------------------===//
// isCriticalEdge - Return true if the specified edge is a critical edge.
// Critical edges are edges from a block with multiple successors to a block
// with multiple predecessors.
//
bool llvm::isCriticalEdge(const TerminatorInst *TI, unsigned SuccNum,
bool AllowIdenticalEdges) {
assert(SuccNum < TI->getNumSuccessors() && "Illegal edge specification!");
if (TI->getNumSuccessors() == 1) return false;
const BasicBlock *Dest = TI->getSuccessor(SuccNum);
const_pred_iterator I = pred_begin(Dest), E = pred_end(Dest);
// If there is more than one predecessor, this is a critical edge...
assert(I != E && "No preds, but we have an edge to the block?");
const BasicBlock *FirstPred = *I;
++I; // Skip one edge due to the incoming arc from TI.
if (!AllowIdenticalEdges)
return I != E;
// If AllowIdenticalEdges is true, then we allow this edge to be considered
// non-critical iff all preds come from TI's block.
while (I != E) {
const BasicBlock *P = *I;
if (P != FirstPred)
return true;
// Note: leave this as is until no one ever compiles with either gcc 4.0.1
// or Xcode 2. This seems to work around the pred_iterator assert in PR 2207
E = pred_end(P);
++I;
}
return false;
}
/// createPHIsForSplitLoopExit - When a loop exit edge is split, LCSSA form
/// may require new PHIs in the new exit block. This function inserts the
/// new PHIs, as needed. Preds is a list of preds inside the loop, SplitBB

1
lib/Transforms/Utils/DemoteRegToStack.cpp
View File

@ -10,6 +10,7 @@
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/Analysis/CFG.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Type.h"

359
unittests/Analysis/CFGTest.cpp Normal file
View File

@ -0,0 +1,359 @@
//===- CFGTest.cpp - CFG tests --------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/CFG.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Assembly/Parser.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/InstIterator.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Pass.h"
#include "llvm/PassManager.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
// This fixture assists in running the isPotentiallyReachable utility four ways
// and ensuring it produces the correct answer each time.
class IsPotentiallyReachableTest : public testing::Test {
protected:
void ParseAssembly(const char *Assembly) {
M.reset(new Module("Module", getGlobalContext()));
SMDiagnostic Error;
bool Parsed = ParseAssemblyString(Assembly, M.get(),
Error, M->getContext()) == M.get();
std::string errMsg;
raw_string_ostream os(errMsg);
Error.print("", os);
if (!Parsed) {
// A failure here means that the test itself is buggy.
report_fatal_error(os.str().c_str());
}
Function *F = M->getFunction("test");
if (F == NULL)
report_fatal_error("Test must have a function named @test");
A = B = NULL;
for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I) {
if (I->hasName()) {
if (I->getName() == "A")
A = &*I;
else if (I->getName() == "B")
B = &*I;
}
}
if (A == NULL)
report_fatal_error("@test must have an instruction %A");
if (B == NULL)
report_fatal_error("@test must have an instruction %B");
}
void ExpectPath(bool ExpectedResult) {
static char ID;
class IsPotentiallyReachableTestPass : public FunctionPass {
public:
IsPotentiallyReachableTestPass(bool ExpectedResult,
Instruction *A, Instruction *B)
: FunctionPass(ID), ExpectedResult(ExpectedResult), A(A), B(B) {}
static int initialize() {
PassInfo *PI = new PassInfo("isPotentiallyReachable testing pass",
"", &ID, 0, true, true);
PassRegistry::getPassRegistry()->registerPass(*PI, false);
initializeLoopInfoPass(*PassRegistry::getPassRegistry());
initializeDominatorTreePass(*PassRegistry::getPassRegistry());
return 0;
}
void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequired<LoopInfo>();
AU.addRequired<DominatorTree>();
}
bool runOnFunction(Function &F) {
if (!F.hasName() || F.getName() != "test")
return false;
LoopInfo *LI = &getAnalysis<LoopInfo>();
DominatorTree *DT = &getAnalysis<DominatorTree>();
EXPECT_EQ(isPotentiallyReachable(A, B, 0, 0), ExpectedResult);
EXPECT_EQ(isPotentiallyReachable(A, B, DT, 0), ExpectedResult);
EXPECT_EQ(isPotentiallyReachable(A, B, 0, LI), ExpectedResult);
EXPECT_EQ(isPotentiallyReachable(A, B, DT, LI), ExpectedResult);
return false;
}
bool ExpectedResult;
Instruction *A, *B;
};
static int initialize = IsPotentiallyReachableTestPass::initialize();
(void)initialize;
IsPotentiallyReachableTestPass *P =
new IsPotentiallyReachableTestPass(ExpectedResult, A, B);
PassManager PM;
PM.add(P);
PM.run(*M);
}
private:
OwningPtr<Module> M;
Instruction *A, *B;
};
}
TEST_F(IsPotentiallyReachableTest, SameBlockNoPath) {
ParseAssembly(
"define void @test() {\n"
"entry:\n"
" bitcast i8 undef to i8\n"
" %B = bitcast i8 undef to i8\n"
" bitcast i8 undef to i8\n"
" bitcast i8 undef to i8\n"
" %A = bitcast i8 undef to i8\n"
" ret void\n"
"}\n");
ExpectPath(false);
}
TEST_F(IsPotentiallyReachableTest, SameBlockPath) {
ParseAssembly(
"define void @test() {\n"
"entry:\n"
" %A = bitcast i8 undef to i8\n"
" bitcast i8 undef to i8\n"
" bitcast i8 undef to i8\n"
" %B = bitcast i8 undef to i8\n"
" ret void\n"
"}\n");
ExpectPath(true);
}
TEST_F(IsPotentiallyReachableTest, StraightNoPath) {
ParseAssembly(
"define void @test() {\n"
"entry:\n"
" %B = bitcast i8 undef to i8\n"
" br label %exit\n"
"exit:\n"
" %A = bitcast i8 undef to i8\n"
" ret void\n"
"}");
ExpectPath(false);
}
TEST_F(IsPotentiallyReachableTest, StraightPath) {
ParseAssembly(
"define void @test() {\n"
"entry:\n"
" %A = bitcast i8 undef to i8\n"
" br label %exit\n"
"exit:\n"
" %B = bitcast i8 undef to i8\n"
" ret void\n"
"}");
ExpectPath(true);
}
TEST_F(IsPotentiallyReachableTest, DestUnreachable) {
ParseAssembly(
"define void @test() {\n"
"entry:\n"
" br label %midblock\n"
"midblock:\n"
" %A = bitcast i8 undef to i8\n"
" ret void\n"
"unreachable:\n"
" %B = bitcast i8 undef to i8\n"
" br label %midblock\n"
"}");
ExpectPath(false);
}
TEST_F(IsPotentiallyReachableTest, BranchToReturn) {
ParseAssembly(
"define void @test(i1 %x) {\n"
"entry:\n"
" %A = bitcast i8 undef to i8\n"
" br i1 %x, label %block1, label %block2\n"
"block1:\n"
" ret void\n"
"block2:\n"
" %B = bitcast i8 undef to i8\n"
" ret void\n"
"}");
ExpectPath(true);
}
TEST_F(IsPotentiallyReachableTest, SimpleLoop1) {
ParseAssembly(
"declare i1 @switch()\n"
"\n"
"define void @test() {\n"
"entry:\n"
" br label %loop\n"
"loop:\n"
" %B = bitcast i8 undef to i8\n"
" %A = bitcast i8 undef to i8\n"
" %x = call i1 @switch()\n"
" br i1 %x, label %loop, label %exit\n"
"exit:\n"
" ret void\n"
"}");
ExpectPath(true);
}
TEST_F(IsPotentiallyReachableTest, SimpleLoop2) {
ParseAssembly(
"declare i1 @switch()\n"
"\n"
"define void @test() {\n"
"entry:\n"
" %B = bitcast i8 undef to i8\n"
" br label %loop\n"
"loop:\n"
" %A = bitcast i8 undef to i8\n"
" %x = call i1 @switch()\n"
" br i1 %x, label %loop, label %exit\n"
"exit:\n"
" ret void\n"
"}");
ExpectPath(false);
}
TEST_F(IsPotentiallyReachableTest, SimpleLoop3) {
ParseAssembly(
"declare i1 @switch()\n"
"\n"
"define void @test() {\n"
"entry:\n"
" br label %loop\n"
"loop:\n"
" %B = bitcast i8 undef to i8\n"
" %x = call i1 @switch()\n"
" br i1 %x, label %loop, label %exit\n"
"exit:\n"
" %A = bitcast i8 undef to i8\n"
" ret void\n"
"}");
ExpectPath(false);
}
TEST_F(IsPotentiallyReachableTest, OneLoopAfterTheOther1) {
ParseAssembly(
"declare i1 @switch()\n"
"\n"
"define void @test() {\n"
"entry:\n"
" br label %loop1\n"
"loop1:\n"
" %A = bitcast i8 undef to i8\n"
" %x = call i1 @switch()\n"
" br i1 %x, label %loop1, label %loop1exit\n"
"loop1exit:\n"
" br label %loop2\n"
"loop2:\n"
" %B = bitcast i8 undef to i8\n"
" %y = call i1 @switch()\n"
" br i1 %x, label %loop2, label %loop2exit\n"
"loop2exit:"
" ret void\n"
"}");
ExpectPath(true);
}
TEST_F(IsPotentiallyReachableTest, OneLoopAfterTheOther2) {
ParseAssembly(
"declare i1 @switch()\n"
"\n"
"define void @test() {\n"
"entry:\n"
" br label %loop1\n"
"loop1:\n"
" %B = bitcast i8 undef to i8\n"
" %x = call i1 @switch()\n"
" br i1 %x, label %loop1, label %loop1exit\n"
"loop1exit:\n"
" br label %loop2\n"
"loop2:\n"
" %A = bitcast i8 undef to i8\n"
" %y = call i1 @switch()\n"
" br i1 %x, label %loop2, label %loop2exit\n"
"loop2exit:"
" ret void\n"
"}");
ExpectPath(false);
}
TEST_F(IsPotentiallyReachableTest, OneLoopAfterTheOtherInsideAThirdLoop) {
ParseAssembly(
"declare i1 @switch()\n"
"\n"
"define void @test() {\n"
"entry:\n"
" br label %outerloop3\n"
"outerloop3:\n"
" br label %innerloop1\n"
"innerloop1:\n"
" %B = bitcast i8 undef to i8\n"
" %x = call i1 @switch()\n"
" br i1 %x, label %innerloop1, label %innerloop1exit\n"
"innerloop1exit:\n"
" br label %innerloop2\n"
"innerloop2:\n"
" %A = bitcast i8 undef to i8\n"
" %y = call i1 @switch()\n"
" br i1 %x, label %innerloop2, label %innerloop2exit\n"
"innerloop2exit:"
" ;; In outer loop3 now.\n"
" %z = call i1 @switch()\n"
" br i1 %z, label %outerloop3, label %exit\n"
"exit:\n"
" ret void\n"
"}");
ExpectPath(true);
}
TEST_F(IsPotentiallyReachableTest, BranchInsideLoop) {
ParseAssembly(
"declare i1 @switch()\n"
"\n"
"define void @test() {\n"
"entry:\n"
" br label %loop\n"
"loop:\n"
" %x = call i1 @switch()\n"
" br i1 %x, label %nextloopblock, label %exit\n"
"nextloopblock:\n"
" %y = call i1 @switch()\n"
" br i1 %y, label %left, label %right\n"
"left:\n"
" %A = bitcast i8 undef to i8\n"
" br label %loop\n"
"right:\n"
" %B = bitcast i8 undef to i8\n"
" br label %loop\n"
"exit:\n"
" ret void\n"
"}");
ExpectPath(true);
}

1
unittests/Analysis/CMakeLists.txt
View File

@ -1,5 +1,6 @@
set(LLVM_LINK_COMPONENTS
Analysis
AsmParser
)
add_llvm_unittest(AnalysisTests

2
unittests/Analysis/Makefile
View File

@ -9,7 +9,7 @@
LEVEL = ../..
TESTNAME = Analysis
LINK_COMPONENTS := analysis
LINK_COMPONENTS := analysis asmparser
include $(LEVEL)/Makefile.config
include $(LLVM_SRC_ROOT)/unittests/Makefile.unittest