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//===- ThreadSafetyCommon.cpp ----------------------------------*- C++ --*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Implementation of the interfaces declared in ThreadSafetyCommon.h
//
//===----------------------------------------------------------------------===//
#include "clang/Analysis/Analyses/ThreadSafetyCommon.h"
#include "clang/AST/Attr.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/StmtCXX.h"
#include "clang/Analysis/Analyses/PostOrderCFGView.h"
#include "clang/Analysis/Analyses/ThreadSafetyTIL.h"
#include "clang/Analysis/Analyses/ThreadSafetyTraverse.h"
#include "clang/Analysis/AnalysisContext.h"
#include "clang/Analysis/CFG.h"
#include "clang/Basic/OperatorKinds.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Basic/SourceManager.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include <algorithm>
#include <climits>
#include <vector>
namespace clang {
namespace threadSafety {
namespace til {
// If E is a variable, then trace back through any aliases or redundant
// Phi nodes to find the canonical definition.
SExpr *getCanonicalVal(SExpr *E) {
while (auto *V = dyn_cast<Variable>(E)) {
SExpr *D;
do {
if (V->kind() != Variable::VK_Let)
return V;
D = V->definition();
auto *V2 = dyn_cast<Variable>(D);
if (V2)
V = V2;
else
break;
} while (true);
if (ThreadSafetyTIL::isTrivial(D))
return D;
if (Phi *Ph = dyn_cast<Phi>(D)) {
if (Ph->status() == Phi::PH_Incomplete)
simplifyIncompleteArg(V, Ph);
if (Ph->status() == Phi::PH_SingleVal) {
E = Ph->values()[0];
continue;
}
}
return V;
}
return E;
}
// Trace the arguments of an incomplete Phi node to see if they have the same
// canonical definition. If so, mark the Phi node as redundant.
// getCanonicalVal() will recursively call simplifyIncompletePhi().
void simplifyIncompleteArg(Variable *V, til::Phi *Ph) {
assert(Ph && Ph->status() == Phi::PH_Incomplete);
// eliminate infinite recursion -- assume that this node is not redundant.
Ph->setStatus(Phi::PH_MultiVal);
SExpr *E0 = getCanonicalVal(Ph->values()[0]);
for (unsigned i=1, n=Ph->values().size(); i<n; ++i) {
SExpr *Ei = getCanonicalVal(Ph->values()[i]);
if (Ei == V)
continue; // Recursive reference to itself. Don't count.
if (Ei != E0) {
return; // Status is already set to MultiVal.
}
}
Ph->setStatus(Phi::PH_SingleVal);
// Eliminate Redundant Phi node.
V->setDefinition(Ph->values()[0]);
}
// Return true if E is a variable that points to an incomplete Phi node.
static bool isIncompleteVar(const SExpr *E) {
if (const auto *V = dyn_cast<Variable>(E)) {
if (const auto *Ph = dyn_cast<Phi>(V->definition()))
return Ph->status() == Phi::PH_Incomplete;
}
return false;
}
} // end namespace til
typedef SExprBuilder::CallingContext CallingContext;
til::SExpr *SExprBuilder::lookupStmt(const Stmt *S) {
auto It = SMap.find(S);
if (It != SMap.end())
return It->second;
return nullptr;
}
til::SCFG *SExprBuilder::buildCFG(CFGWalker &Walker) {
Walker.walk(*this);
return Scfg;
}
// Translate a clang statement or expression to a TIL expression.
// Also performs substitution of variables; Ctx provides the context.
// Dispatches on the type of S.
til::SExpr *SExprBuilder::translate(const Stmt *S, CallingContext *Ctx) {
if (!S)
return nullptr;
// Check if S has already been translated and cached.
// This handles the lookup of SSA names for DeclRefExprs here.
if (til::SExpr *E = lookupStmt(S))
return E;
switch (S->getStmtClass()) {
case Stmt::DeclRefExprClass:
return translateDeclRefExpr(cast<DeclRefExpr>(S), Ctx);
case Stmt::CXXThisExprClass:
return translateCXXThisExpr(cast<CXXThisExpr>(S), Ctx);
case Stmt::MemberExprClass:
return translateMemberExpr(cast<MemberExpr>(S), Ctx);
case Stmt::CallExprClass:
return translateCallExpr(cast<CallExpr>(S), Ctx);
case Stmt::CXXMemberCallExprClass:
return translateCXXMemberCallExpr(cast<CXXMemberCallExpr>(S), Ctx);
case Stmt::CXXOperatorCallExprClass:
return translateCXXOperatorCallExpr(cast<CXXOperatorCallExpr>(S), Ctx);
case Stmt::UnaryOperatorClass:
return translateUnaryOperator(cast<UnaryOperator>(S), Ctx);
case Stmt::BinaryOperatorClass:
case Stmt::CompoundAssignOperatorClass:
return translateBinaryOperator(cast<BinaryOperator>(S), Ctx);
case Stmt::ArraySubscriptExprClass:
return translateArraySubscriptExpr(cast<ArraySubscriptExpr>(S), Ctx);
case Stmt::ConditionalOperatorClass:
return translateConditionalOperator(cast<ConditionalOperator>(S), Ctx);
case Stmt::BinaryConditionalOperatorClass:
return translateBinaryConditionalOperator(
cast<BinaryConditionalOperator>(S), Ctx);
// We treat these as no-ops
case Stmt::ParenExprClass:
return translate(cast<ParenExpr>(S)->getSubExpr(), Ctx);
case Stmt::ExprWithCleanupsClass:
return translate(cast<ExprWithCleanups>(S)->getSubExpr(), Ctx);
case Stmt::CXXBindTemporaryExprClass:
return translate(cast<CXXBindTemporaryExpr>(S)->getSubExpr(), Ctx);
// Collect all literals
case Stmt::CharacterLiteralClass:
case Stmt::CXXNullPtrLiteralExprClass:
case Stmt::GNUNullExprClass:
case Stmt::CXXBoolLiteralExprClass:
case Stmt::FloatingLiteralClass:
case Stmt::ImaginaryLiteralClass:
case Stmt::IntegerLiteralClass:
case Stmt::StringLiteralClass:
case Stmt::ObjCStringLiteralClass:
return new (Arena) til::Literal(cast<Expr>(S));
case Stmt::DeclStmtClass:
return translateDeclStmt(cast<DeclStmt>(S), Ctx);
default:
break;
}
if (const CastExpr *CE = dyn_cast<CastExpr>(S))
return translateCastExpr(CE, Ctx);
return new (Arena) til::Undefined(S);
}
til::SExpr *SExprBuilder::translateDeclRefExpr(const DeclRefExpr *DRE,
CallingContext *Ctx) {
const ValueDecl *VD = cast<ValueDecl>(DRE->getDecl()->getCanonicalDecl());
// Function parameters require substitution and/or renaming.
if (const ParmVarDecl *PV = dyn_cast_or_null<ParmVarDecl>(VD)) {
const FunctionDecl *FD =
cast<FunctionDecl>(PV->getDeclContext())->getCanonicalDecl();
unsigned I = PV->getFunctionScopeIndex();
if (Ctx && Ctx->FunArgs && FD == Ctx->AttrDecl->getCanonicalDecl()) {
// Substitute call arguments for references to function parameters
assert(I < Ctx->NumArgs);
return translate(Ctx->FunArgs[I], Ctx->Prev);
}
// Map the param back to the param of the original function declaration
// for consistent comparisons.
VD = FD->getParamDecl(I);
}
// For non-local variables, treat it as a referenced to a named object.
return new (Arena) til::LiteralPtr(VD);
}
til::SExpr *SExprBuilder::translateCXXThisExpr(const CXXThisExpr *TE,
CallingContext *Ctx) {
// Substitute for 'this'
if (Ctx && Ctx->SelfArg)
return translate(Ctx->SelfArg, Ctx->Prev);
assert(SelfVar && "We have no variable for 'this'!");
return SelfVar;
}
til::SExpr *SExprBuilder::translateMemberExpr(const MemberExpr *ME,
CallingContext *Ctx) {
til::SExpr *E = translate(ME->getBase(), Ctx);
E = new (Arena) til::SApply(E);
return new (Arena) til::Project(E, ME->getMemberDecl());
}
til::SExpr *SExprBuilder::translateCallExpr(const CallExpr *CE,
CallingContext *Ctx) {
// TODO -- Lock returned
til::SExpr *E = translate(CE->getCallee(), Ctx);
for (const auto *Arg : CE->arguments()) {
til::SExpr *A = translate(Arg, Ctx);
E = new (Arena) til::Apply(E, A);
}
return new (Arena) til::Call(E, CE);
}
til::SExpr *SExprBuilder::translateCXXMemberCallExpr(
const CXXMemberCallExpr *ME, CallingContext *Ctx) {
return translateCallExpr(cast<CallExpr>(ME), Ctx);
}
til::SExpr *SExprBuilder::translateCXXOperatorCallExpr(
const CXXOperatorCallExpr *OCE, CallingContext *Ctx) {
return translateCallExpr(cast<CallExpr>(OCE), Ctx);
}
til::SExpr *SExprBuilder::translateUnaryOperator(const UnaryOperator *UO,
CallingContext *Ctx) {
switch (UO->getOpcode()) {
case UO_PostInc:
case UO_PostDec:
case UO_PreInc:
case UO_PreDec:
return new (Arena) til::Undefined(UO);
// We treat these as no-ops
case UO_AddrOf:
case UO_Deref:
case UO_Plus:
return translate(UO->getSubExpr(), Ctx);
case UO_Minus:
case UO_Not:
case UO_LNot:
case UO_Real:
case UO_Imag:
case UO_Extension:
return new (Arena)
til::UnaryOp(UO->getOpcode(), translate(UO->getSubExpr(), Ctx));
}
return new (Arena) til::Undefined(UO);
}
til::SExpr *SExprBuilder::translateBinAssign(til::TIL_BinaryOpcode Op,
const BinaryOperator *BO,
CallingContext *Ctx) {
const Expr *LHS = BO->getLHS();
const Expr *RHS = BO->getRHS();
til::SExpr *E0 = translate(LHS, Ctx);
til::SExpr *E1 = translate(RHS, Ctx);
const ValueDecl *VD = nullptr;
til::SExpr *CV = nullptr;
if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(LHS)) {
VD = DRE->getDecl();
CV = lookupVarDecl(VD);
}
if (Op != BO_Assign) {
til::SExpr *Arg = CV ? CV : new (Arena) til::Load(E0);
E1 = new (Arena) til::BinaryOp(Op, Arg, E1);
E1 = addStatement(E1, nullptr, VD);
}
if (VD && CV)
return updateVarDecl(VD, E1);
return new (Arena) til::Store(E0, E1);
}
til::SExpr *SExprBuilder::translateBinaryOperator(const BinaryOperator *BO,
CallingContext *Ctx) {
switch (BO->getOpcode()) {
case BO_PtrMemD:
case BO_PtrMemI:
return new (Arena) til::Undefined(BO);
case BO_Mul:
case BO_Div:
case BO_Rem:
case BO_Add:
case BO_Sub:
case BO_Shl:
case BO_Shr:
case BO_LT:
case BO_GT:
case BO_LE:
case BO_GE:
case BO_EQ:
case BO_NE:
case BO_And:
case BO_Xor:
case BO_Or:
case BO_LAnd:
case BO_LOr:
return new (Arena)
til::BinaryOp(BO->getOpcode(), translate(BO->getLHS(), Ctx),
translate(BO->getRHS(), Ctx));
case BO_Assign: return translateBinAssign(BO_Assign, BO, Ctx);
case BO_MulAssign: return translateBinAssign(BO_Mul, BO, Ctx);
case BO_DivAssign: return translateBinAssign(BO_Div, BO, Ctx);
case BO_RemAssign: return translateBinAssign(BO_Rem, BO, Ctx);
case BO_AddAssign: return translateBinAssign(BO_Add, BO, Ctx);
case BO_SubAssign: return translateBinAssign(BO_Sub, BO, Ctx);
case BO_ShlAssign: return translateBinAssign(BO_Shl, BO, Ctx);
case BO_ShrAssign: return translateBinAssign(BO_Shr, BO, Ctx);
case BO_AndAssign: return translateBinAssign(BO_And, BO, Ctx);
case BO_XorAssign: return translateBinAssign(BO_Xor, BO, Ctx);
case BO_OrAssign: return translateBinAssign(BO_Or, BO, Ctx);
case BO_Comma:
// The clang CFG should have already processed both sides.
return translate(BO->getRHS(), Ctx);
}
return new (Arena) til::Undefined(BO);
}
til::SExpr *SExprBuilder::translateCastExpr(const CastExpr *CE,
CallingContext *Ctx) {
clang::CastKind K = CE->getCastKind();
switch (K) {
case CK_LValueToRValue: {
if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CE->getSubExpr())) {
til::SExpr *E0 = lookupVarDecl(DRE->getDecl());
if (E0)
return E0;
}
til::SExpr *E0 = translate(CE->getSubExpr(), Ctx);
return new (Arena) til::Load(E0);
}
case CK_NoOp:
case CK_DerivedToBase:
case CK_UncheckedDerivedToBase:
case CK_ArrayToPointerDecay:
case CK_FunctionToPointerDecay: {
til::SExpr *E0 = translate(CE->getSubExpr(), Ctx);
return E0;
}
default: {
til::SExpr *E0 = translate(CE->getSubExpr(), Ctx);
return new (Arena) til::Cast(K, E0);
}
}
}
til::SExpr *
SExprBuilder::translateArraySubscriptExpr(const ArraySubscriptExpr *E,
CallingContext *Ctx) {
til::SExpr *E0 = translate(E->getBase(), Ctx);
til::SExpr *E1 = translate(E->getIdx(), Ctx);
auto *AA = new (Arena) til::ArrayAdd(E0, E1);
return new (Arena) til::ArrayFirst(AA);
}
til::SExpr *
SExprBuilder::translateConditionalOperator(const ConditionalOperator *C,
CallingContext *Ctx) {
return new (Arena) til::Undefined(C);
}
til::SExpr *SExprBuilder::translateBinaryConditionalOperator(
const BinaryConditionalOperator *C, CallingContext *Ctx) {
return new (Arena) til::Undefined(C);
}
til::SExpr *
SExprBuilder::translateDeclStmt(const DeclStmt *S, CallingContext *Ctx) {
DeclGroupRef DGrp = S->getDeclGroup();
for (DeclGroupRef::iterator I = DGrp.begin(), E = DGrp.end(); I != E; ++I) {
if (VarDecl *VD = dyn_cast_or_null<VarDecl>(*I)) {
Expr *E = VD->getInit();
til::SExpr* SE = translate(E, Ctx);
// Add local variables with trivial type to the variable map
QualType T = VD->getType();
if (T.isTrivialType(VD->getASTContext())) {
return addVarDecl(VD, SE);
}
else {
// TODO: add alloca
}
}
}
return nullptr;
}
// If (E) is non-trivial, then add it to the current basic block, and
// update the statement map so that S refers to E. Returns a new variable
// that refers to E.
// If E is trivial returns E.
til::SExpr *SExprBuilder::addStatement(til::SExpr* E, const Stmt *S,
const ValueDecl *VD) {
if (!E)
return nullptr;
if (til::ThreadSafetyTIL::isTrivial(E))
return E;
til::Variable *V = new (Arena) til::Variable(E, VD);
CurrentInstructions.push_back(V);
if (S)
insertStmt(S, V);
return V;
}
// Returns the current value of VD, if known, and nullptr otherwise.
til::SExpr *SExprBuilder::lookupVarDecl(const ValueDecl *VD) {
auto It = LVarIdxMap.find(VD);
if (It != LVarIdxMap.end()) {
assert(CurrentLVarMap[It->second].first == VD);
return CurrentLVarMap[It->second].second;
}
return nullptr;
}
// if E is a til::Variable, update its clangDecl.
inline void maybeUpdateVD(til::SExpr *E, const ValueDecl *VD) {
if (!E)
return;
if (til::Variable *V = dyn_cast<til::Variable>(E)) {
if (!V->clangDecl())
V->setClangDecl(VD);
}
}
// Adds a new variable declaration.
til::SExpr *SExprBuilder::addVarDecl(const ValueDecl *VD, til::SExpr *E) {
maybeUpdateVD(E, VD);
LVarIdxMap.insert(std::make_pair(VD, CurrentLVarMap.size()));
CurrentLVarMap.makeWritable();
CurrentLVarMap.push_back(std::make_pair(VD, E));
return E;
}
// Updates a current variable declaration. (E.g. by assignment)
til::SExpr *SExprBuilder::updateVarDecl(const ValueDecl *VD, til::SExpr *E) {
maybeUpdateVD(E, VD);
auto It = LVarIdxMap.find(VD);
if (It == LVarIdxMap.end()) {
til::SExpr *Ptr = new (Arena) til::LiteralPtr(VD);
til::SExpr *St = new (Arena) til::Store(Ptr, E);
return St;
}
CurrentLVarMap.makeWritable();
CurrentLVarMap.elem(It->second).second = E;
return E;
}
// Make a Phi node in the current block for the i^th variable in CurrentVarMap.
// If E != null, sets Phi[CurrentBlockInfo->ArgIndex] = E.
// If E == null, this is a backedge and will be set later.
void SExprBuilder::makePhiNodeVar(unsigned i, unsigned NPreds, til::SExpr *E) {
unsigned ArgIndex = CurrentBlockInfo->ProcessedPredecessors;
assert(ArgIndex > 0 && ArgIndex < NPreds);
til::Variable *V = dyn_cast<til::Variable>(CurrentLVarMap[i].second);
if (V && V->getBlockID() == CurrentBB->blockID()) {
// We already have a Phi node in the current block,
// so just add the new variable to the Phi node.
til::Phi *Ph = dyn_cast<til::Phi>(V->definition());
assert(Ph && "Expecting Phi node.");
if (E)
Ph->values()[ArgIndex] = E;
return;
}
// Make a new phi node: phi(..., E)
// All phi args up to the current index are set to the current value.
til::SExpr *CurrE = CurrentLVarMap[i].second;
til::Phi *Ph = new (Arena) til::Phi(Arena, NPreds);
Ph->values().setValues(NPreds, nullptr);
for (unsigned PIdx = 0; PIdx < ArgIndex; ++PIdx)
Ph->values()[PIdx] = CurrE;
if (E)
Ph->values()[ArgIndex] = E;
// If E is from a back-edge, or either E or CurrE are incomplete, then
// mark this node as incomplete; we may need to remove it later.
if (!E || isIncompleteVar(E) || isIncompleteVar(CurrE)) {
Ph->setStatus(til::Phi::PH_Incomplete);
}
// Add Phi node to current block, and update CurrentLVarMap[i]
auto *Var = new (Arena) til::Variable(Ph, CurrentLVarMap[i].first);
CurrentArguments.push_back(Var);
if (Ph->status() == til::Phi::PH_Incomplete)
IncompleteArgs.push_back(Var);
CurrentLVarMap.makeWritable();
CurrentLVarMap.elem(i).second = Var;
}
// Merge values from Map into the current variable map.
// This will construct Phi nodes in the current basic block as necessary.
void SExprBuilder::mergeEntryMap(LVarDefinitionMap Map) {
assert(CurrentBlockInfo && "Not processing a block!");
if (!CurrentLVarMap.valid()) {
// Steal Map, using copy-on-write.
CurrentLVarMap = std::move(Map);
return;
}
if (CurrentLVarMap.sameAs(Map))
return; // Easy merge: maps from different predecessors are unchanged.
unsigned NPreds = CurrentBB->numPredecessors();
unsigned ESz = CurrentLVarMap.size();
unsigned MSz = Map.size();
unsigned Sz = std::min(ESz, MSz);
for (unsigned i=0; i<Sz; ++i) {
if (CurrentLVarMap[i].first != Map[i].first) {
// We've reached the end of variables in common.
CurrentLVarMap.makeWritable();
CurrentLVarMap.downsize(i);
break;
}
if (CurrentLVarMap[i].second != Map[i].second)
makePhiNodeVar(i, NPreds, Map[i].second);
}
if (ESz > MSz) {
CurrentLVarMap.makeWritable();
CurrentLVarMap.downsize(Map.size());
}
}
// Merge a back edge into the current variable map.
// This will create phi nodes for all variables in the variable map.
void SExprBuilder::mergeEntryMapBackEdge() {
// We don't have definitions for variables on the backedge, because we
// haven't gotten that far in the CFG. Thus, when encountering a back edge,
// we conservatively create Phi nodes for all variables. Unnecessary Phi
// nodes will be marked as incomplete, and stripped out at the end.
//
// An Phi node is unnecessary if it only refers to itself and one other
// variable, e.g. x = Phi(y, y, x) can be reduced to x = y.
assert(CurrentBlockInfo && "Not processing a block!");
if (CurrentBlockInfo->HasBackEdges)
return;
CurrentBlockInfo->HasBackEdges = true;
CurrentLVarMap.makeWritable();
unsigned Sz = CurrentLVarMap.size();
unsigned NPreds = CurrentBB->numPredecessors();
for (unsigned i=0; i < Sz; ++i) {
makePhiNodeVar(i, NPreds, nullptr);
}
}
// Update the phi nodes that were initially created for a back edge
// once the variable definitions have been computed.
// I.e., merge the current variable map into the phi nodes for Blk.
void SExprBuilder::mergePhiNodesBackEdge(const CFGBlock *Blk) {
til::BasicBlock *BB = lookupBlock(Blk);
unsigned ArgIndex = BBInfo[Blk->getBlockID()].ProcessedPredecessors;
assert(ArgIndex > 0 && ArgIndex < BB->numPredecessors());
for (til::Variable *V : BB->arguments()) {
til::Phi *Ph = dyn_cast_or_null<til::Phi>(V->definition());
assert(Ph && "Expecting Phi Node.");
assert(Ph->values()[ArgIndex] == nullptr && "Wrong index for back edge.");
assert(V->clangDecl() && "No local variable for Phi node.");
til::SExpr *E = lookupVarDecl(V->clangDecl());
assert(E && "Couldn't find local variable for Phi node.");
Ph->values()[ArgIndex] = E;
}
}
void SExprBuilder::enterCFG(CFG *Cfg, const FunctionDecl *FD,
const CFGBlock *First) {
// Perform initial setup operations.
unsigned NBlocks = Cfg->getNumBlockIDs();
Scfg = new (Arena) til::SCFG(Arena, NBlocks);
// allocate all basic blocks immediately, to handle forward references.
BBInfo.resize(NBlocks);
BlockMap.resize(NBlocks, nullptr);
// create map from clang blockID to til::BasicBlocks
for (auto *B : *Cfg) {
auto *BB = new (Arena) til::BasicBlock(Arena, 0, B->size());
BlockMap[B->getBlockID()] = BB;
}
CallCtx.reset(new SExprBuilder::CallingContext(FD));
CurrentBB = lookupBlock(&Cfg->getEntry());
for (auto *Pm : FD->parameters()) {
QualType T = Pm->getType();
if (!T.isTrivialType(Pm->getASTContext()))
continue;
// Add parameters to local variable map.
// FIXME: right now we emulate params with loads; that should be fixed.
til::SExpr *Lp = new (Arena) til::LiteralPtr(Pm);
til::SExpr *Ld = new (Arena) til::Load(Lp);
til::SExpr *V = addStatement(Ld, nullptr, Pm);
addVarDecl(Pm, V);
}
}
void SExprBuilder::enterCFGBlock(const CFGBlock *B) {
// Intialize TIL basic block and add it to the CFG.
CurrentBB = lookupBlock(B);
CurrentBB->setNumPredecessors(B->pred_size());
Scfg->add(CurrentBB);
CurrentBlockInfo = &BBInfo[B->getBlockID()];
// CurrentLVarMap is moved to ExitMap on block exit.
// FIXME: the entry block will hold function parameters.
// assert(!CurrentLVarMap.valid() && "CurrentLVarMap already initialized.");
}
void SExprBuilder::handlePredecessor(const CFGBlock *Pred) {
// Compute CurrentLVarMap on entry from ExitMaps of predecessors
BlockInfo *PredInfo = &BBInfo[Pred->getBlockID()];
assert(PredInfo->UnprocessedSuccessors > 0);
if (--PredInfo->UnprocessedSuccessors == 0)
mergeEntryMap(std::move(PredInfo->ExitMap));
else
mergeEntryMap(PredInfo->ExitMap.clone());
++CurrentBlockInfo->ProcessedPredecessors;
}
void SExprBuilder::handlePredecessorBackEdge(const CFGBlock *Pred) {
mergeEntryMapBackEdge();
}
void SExprBuilder::enterCFGBlockBody(const CFGBlock *B) {
// The merge*() methods have created arguments.
// Push those arguments onto the basic block.
CurrentBB->arguments().reserve(
static_cast<unsigned>(CurrentArguments.size()), Arena);
for (auto *V : CurrentArguments)
CurrentBB->addArgument(V);
}
void SExprBuilder::handleStatement(const Stmt *S) {
til::SExpr *E = translate(S, CallCtx.get());
addStatement(E, S);
}
void SExprBuilder::handleDestructorCall(const VarDecl *VD,
const CXXDestructorDecl *DD) {
til::SExpr *Sf = new (Arena) til::LiteralPtr(VD);
til::SExpr *Dr = new (Arena) til::LiteralPtr(DD);
til::SExpr *Ap = new (Arena) til::Apply(Dr, Sf);
til::SExpr *E = new (Arena) til::Call(Ap);
addStatement(E, nullptr);
}
void SExprBuilder::exitCFGBlockBody(const CFGBlock *B) {
CurrentBB->instructions().reserve(
static_cast<unsigned>(CurrentInstructions.size()), Arena);
for (auto *V : CurrentInstructions)
CurrentBB->addInstruction(V);
// Create an appropriate terminator
unsigned N = B->succ_size();
auto It = B->succ_begin();
if (N == 1) {
til::BasicBlock *BB = *It ? lookupBlock(*It) : nullptr;
// TODO: set index
til::SExpr *Tm = new (Arena) til::Goto(BB, 0);
CurrentBB->setTerminator(Tm);
}
else if (N == 2) {
til::SExpr *C = translate(B->getTerminatorCondition(true), CallCtx.get());
til::BasicBlock *BB1 = *It ? lookupBlock(*It) : nullptr;
++It;
til::BasicBlock *BB2 = *It ? lookupBlock(*It) : nullptr;
// TODO: set conditional, set index
til::SExpr *Tm = new (Arena) til::Branch(C, BB1, BB2);
CurrentBB->setTerminator(Tm);
}
}
void SExprBuilder::handleSuccessor(const CFGBlock *Succ) {
++CurrentBlockInfo->UnprocessedSuccessors;
}
void SExprBuilder::handleSuccessorBackEdge(const CFGBlock *Succ) {
mergePhiNodesBackEdge(Succ);
++BBInfo[Succ->getBlockID()].ProcessedPredecessors;
}
void SExprBuilder::exitCFGBlock(const CFGBlock *B) {
CurrentArguments.clear();
CurrentInstructions.clear();
CurrentBlockInfo->ExitMap = std::move(CurrentLVarMap);
CurrentBB = nullptr;
CurrentBlockInfo = nullptr;
}
void SExprBuilder::exitCFG(const CFGBlock *Last) {
for (auto *V : IncompleteArgs) {
til::Phi *Ph = dyn_cast<til::Phi>(V->definition());
if (Ph && Ph->status() == til::Phi::PH_Incomplete)
simplifyIncompleteArg(V, Ph);
}
CurrentArguments.clear();
CurrentInstructions.clear();
IncompleteArgs.clear();
}
class LLVMPrinter : public til::PrettyPrinter<LLVMPrinter, llvm::raw_ostream> {
};
void printSCFG(CFGWalker &Walker) {
llvm::BumpPtrAllocator Bpa;
til::MemRegionRef Arena(&Bpa);
SExprBuilder builder(Arena);
til::SCFG *Cfg = builder.buildCFG(Walker);
LLVMPrinter::print(Cfg, llvm::errs());
}
} // end namespace threadSafety
} // end namespace clang