/*
* Copyright 2010, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "slang_rs_object_ref_count.h"
#include <list>
#include "clang/AST/DeclGroup.h"
#include "clang/AST/Expr.h"
#include "clang/AST/NestedNameSpecifier.h"
#include "clang/AST/OperationKinds.h"
#include "clang/AST/Stmt.h"
#include "clang/AST/StmtVisitor.h"
#include "slang_assert.h"
#include "slang_rs.h"
#include "slang_rs_ast_replace.h"
#include "slang_rs_export_type.h"
namespace slang {
/* Even though those two arrays are of size DataTypeMax, only entries that
* correspond to object types will be set.
*/
clang::FunctionDecl *
RSObjectRefCount::RSSetObjectFD[DataTypeMax];
clang::FunctionDecl *
RSObjectRefCount::RSClearObjectFD[DataTypeMax];
void RSObjectRefCount::GetRSRefCountingFunctions(clang::ASTContext &C) {
for (unsigned i = 0; i < DataTypeMax; i++) {
RSSetObjectFD[i] = NULL;
RSClearObjectFD[i] = NULL;
}
clang::TranslationUnitDecl *TUDecl = C.getTranslationUnitDecl();
for (clang::DeclContext::decl_iterator I = TUDecl->decls_begin(),
E = TUDecl->decls_end(); I != E; I++) {
if ((I->getKind() >= clang::Decl::firstFunction) &&
(I->getKind() <= clang::Decl::lastFunction)) {
clang::FunctionDecl *FD = static_cast<clang::FunctionDecl*>(*I);
// points to RSSetObjectFD or RSClearObjectFD
clang::FunctionDecl **RSObjectFD;
if (FD->getName() == "rsSetObject") {
slangAssert((FD->getNumParams() == 2) &&
"Invalid rsSetObject function prototype (# params)");
RSObjectFD = RSSetObjectFD;
} else if (FD->getName() == "rsClearObject") {
slangAssert((FD->getNumParams() == 1) &&
"Invalid rsClearObject function prototype (# params)");
RSObjectFD = RSClearObjectFD;
} else {
continue;
}
const clang::ParmVarDecl *PVD = FD->getParamDecl(0);
clang::QualType PVT = PVD->getOriginalType();
// The first parameter must be a pointer like rs_allocation*
slangAssert(PVT->isPointerType() &&
"Invalid rs{Set,Clear}Object function prototype (pointer param)");
// The rs object type passed to the FD
clang::QualType RST = PVT->getPointeeType();
DataType DT = RSExportPrimitiveType::GetRSSpecificType(RST.getTypePtr());
slangAssert(RSExportPrimitiveType::IsRSObjectType(DT)
&& "must be RS object type");
if (DT >= 0 && DT < DataTypeMax) {
RSObjectFD[DT] = FD;
} else {
slangAssert(false && "incorrect type");
}
}
}
}
namespace {
// This function constructs a new CompoundStmt from the input StmtList.
static clang::CompoundStmt* BuildCompoundStmt(clang::ASTContext &C,
std::list<clang::Stmt*> &StmtList, clang::SourceLocation Loc) {
unsigned NewStmtCount = StmtList.size();
unsigned CompoundStmtCount = 0;
clang::Stmt **CompoundStmtList;
CompoundStmtList = new clang::Stmt*[NewStmtCount];
std::list<clang::Stmt*>::const_iterator I = StmtList.begin();
std::list<clang::Stmt*>::const_iterator E = StmtList.end();
for ( ; I != E; I++) {
CompoundStmtList[CompoundStmtCount++] = *I;
}
slangAssert(CompoundStmtCount == NewStmtCount);
clang::CompoundStmt *CS = new(C) clang::CompoundStmt(
C, llvm::makeArrayRef(CompoundStmtList, CompoundStmtCount), Loc, Loc);
delete [] CompoundStmtList;
return CS;
}
static void AppendAfterStmt(clang::ASTContext &C,
clang::CompoundStmt *CS,
clang::Stmt *S,
std::list<clang::Stmt*> &StmtList) {
slangAssert(CS);
clang::CompoundStmt::body_iterator bI = CS->body_begin();
clang::CompoundStmt::body_iterator bE = CS->body_end();
clang::Stmt **UpdatedStmtList =
new clang::Stmt*[CS->size() + StmtList.size()];
unsigned UpdatedStmtCount = 0;
unsigned Once = 0;
for ( ; bI != bE; bI++) {
if (!S && ((*bI)->getStmtClass() == clang::Stmt::ReturnStmtClass)) {
// If we come across a return here, we don't have anything we can
// reasonably replace. We should have already inserted our destructor
// code in the proper spot, so we just clean up and return.
delete [] UpdatedStmtList;
return;
}
UpdatedStmtList[UpdatedStmtCount++] = *bI;
if ((*bI == S) && !Once) {
Once++;
std::list<clang::Stmt*>::const_iterator I = StmtList.begin();
std::list<clang::Stmt*>::const_iterator E = StmtList.end();
for ( ; I != E; I++) {
UpdatedStmtList[UpdatedStmtCount++] = *I;
}
}
}
slangAssert(Once <= 1);
// When S is NULL, we are appending to the end of the CompoundStmt.
if (!S) {
slangAssert(Once == 0);
std::list<clang::Stmt*>::const_iterator I = StmtList.begin();
std::list<clang::Stmt*>::const_iterator E = StmtList.end();
for ( ; I != E; I++) {
UpdatedStmtList[UpdatedStmtCount++] = *I;
}
}
CS->setStmts(C, UpdatedStmtList, UpdatedStmtCount);
delete [] UpdatedStmtList;
}
// This class visits a compound statement and inserts DtorStmt
// in proper locations. This includes inserting it before any
// return statement in any sub-block, at the end of the logical enclosing
// scope (compound statement), and/or before any break/continue statement that
// would resume outside the declared scope. We will not handle the case for
// goto statements that leave a local scope.
//
// To accomplish these goals, it collects a list of sub-Stmt's that
// correspond to scope exit points. It then uses an RSASTReplace visitor to
// transform the AST, inserting appropriate destructors before each of those
// sub-Stmt's (and also before the exit of the outermost containing Stmt for
// the scope).
class DestructorVisitor : public clang::StmtVisitor<DestructorVisitor> {
private:
clang::ASTContext &mCtx;
// The loop depth of the currently visited node.
int mLoopDepth;
// The switch statement depth of the currently visited node.
// Note that this is tracked separately from the loop depth because
// SwitchStmt-contained ContinueStmt's should have destructors for the
// corresponding loop scope.
int mSwitchDepth;
// The outermost statement block that we are currently visiting.
// This should always be a CompoundStmt.
clang::Stmt *mOuterStmt;
// The destructor to execute for this scope/variable.
clang::Stmt* mDtorStmt;
// The stack of statements which should be replaced by a compound statement
// containing the new destructor call followed by the original Stmt.
std::stack<clang::Stmt*> mReplaceStmtStack;
// The source location for the variable declaration that we are trying to
// insert destructors for. Note that InsertDestructors() will not generate
// destructor calls for source locations that occur lexically before this
// location.
clang::SourceLocation mVarLoc;
public:
DestructorVisitor(clang::ASTContext &C,
clang::Stmt* OuterStmt,
clang::Stmt* DtorStmt,
clang::SourceLocation VarLoc);
// This code walks the collected list of Stmts to replace and actually does
// the replacement. It also finishes up by appending the destructor to the
// current outermost CompoundStmt.
void InsertDestructors() {
clang::Stmt *S = NULL;
clang::SourceManager &SM = mCtx.getSourceManager();
std::list<clang::Stmt *> StmtList;
StmtList.push_back(mDtorStmt);
while (!mReplaceStmtStack.empty()) {
S = mReplaceStmtStack.top();
mReplaceStmtStack.pop();
// Skip all source locations that occur before the variable's
// declaration, since it won't have been initialized yet.
if (SM.isBeforeInTranslationUnit(S->getLocStart(), mVarLoc)) {
continue;
}
StmtList.push_back(S);
clang::CompoundStmt *CS =
BuildCompoundStmt(mCtx, StmtList, S->getLocEnd());
StmtList.pop_back();
RSASTReplace R(mCtx);
R.ReplaceStmt(mOuterStmt, S, CS);
}
clang::CompoundStmt *CS =
llvm::dyn_cast<clang::CompoundStmt>(mOuterStmt);
slangAssert(CS);
AppendAfterStmt(mCtx, CS, NULL, StmtList);
}
void VisitStmt(clang::Stmt *S);
void VisitCompoundStmt(clang::CompoundStmt *CS);
void VisitBreakStmt(clang::BreakStmt *BS);
void VisitCaseStmt(clang::CaseStmt *CS);
void VisitContinueStmt(clang::ContinueStmt *CS);
void VisitDefaultStmt(clang::DefaultStmt *DS);
void VisitDoStmt(clang::DoStmt *DS);
void VisitForStmt(clang::ForStmt *FS);
void VisitIfStmt(clang::IfStmt *IS);
void VisitReturnStmt(clang::ReturnStmt *RS);
void VisitSwitchCase(clang::SwitchCase *SC);
void VisitSwitchStmt(clang::SwitchStmt *SS);
void VisitWhileStmt(clang::WhileStmt *WS);
};
DestructorVisitor::DestructorVisitor(clang::ASTContext &C,
clang::Stmt *OuterStmt,
clang::Stmt *DtorStmt,
clang::SourceLocation VarLoc)
: mCtx(C),
mLoopDepth(0),
mSwitchDepth(0),
mOuterStmt(OuterStmt),
mDtorStmt(DtorStmt),
mVarLoc(VarLoc) {
}
void DestructorVisitor::VisitStmt(clang::Stmt *S) {
for (clang::Stmt::child_iterator I = S->child_begin(), E = S->child_end();
I != E;
I++) {
if (clang::Stmt *Child = *I) {
Visit(Child);
}
}
}
void DestructorVisitor::VisitCompoundStmt(clang::CompoundStmt *CS) {
VisitStmt(CS);
}
void DestructorVisitor::VisitBreakStmt(clang::BreakStmt *BS) {
VisitStmt(BS);
if ((mLoopDepth == 0) && (mSwitchDepth == 0)) {
mReplaceStmtStack.push(BS);
}
}
void DestructorVisitor::VisitCaseStmt(clang::CaseStmt *CS) {
VisitStmt(CS);
}
void DestructorVisitor::VisitContinueStmt(clang::ContinueStmt *CS) {
VisitStmt(CS);
if (mLoopDepth == 0) {
// Switch statements can have nested continues.
mReplaceStmtStack.push(CS);
}
}
void DestructorVisitor::VisitDefaultStmt(clang::DefaultStmt *DS) {
VisitStmt(DS);
}
void DestructorVisitor::VisitDoStmt(clang::DoStmt *DS) {
mLoopDepth++;
VisitStmt(DS);
mLoopDepth--;
}
void DestructorVisitor::VisitForStmt(clang::ForStmt *FS) {
mLoopDepth++;
VisitStmt(FS);
mLoopDepth--;
}
void DestructorVisitor::VisitIfStmt(clang::IfStmt *IS) {
VisitStmt(IS);
}
void DestructorVisitor::VisitReturnStmt(clang::ReturnStmt *RS) {
mReplaceStmtStack.push(RS);
}
void DestructorVisitor::VisitSwitchCase(clang::SwitchCase *SC) {
slangAssert(false && "Both case and default have specialized handlers");
VisitStmt(SC);
}
void DestructorVisitor::VisitSwitchStmt(clang::SwitchStmt *SS) {
mSwitchDepth++;
VisitStmt(SS);
mSwitchDepth--;
}
void DestructorVisitor::VisitWhileStmt(clang::WhileStmt *WS) {
mLoopDepth++;
VisitStmt(WS);
mLoopDepth--;
}
clang::Expr *ClearSingleRSObject(clang::ASTContext &C,
clang::Expr *RefRSVar,
clang::SourceLocation Loc) {
slangAssert(RefRSVar);
const clang::Type *T = RefRSVar->getType().getTypePtr();
slangAssert(!T->isArrayType() &&
"Should not be destroying arrays with this function");
clang::FunctionDecl *ClearObjectFD = RSObjectRefCount::GetRSClearObjectFD(T);
slangAssert((ClearObjectFD != NULL) &&
"rsClearObject doesn't cover all RS object types");
clang::QualType ClearObjectFDType = ClearObjectFD->getType();
clang::QualType ClearObjectFDArgType =
ClearObjectFD->getParamDecl(0)->getOriginalType();
// Example destructor for "rs_font localFont;"
//
// (CallExpr 'void'
// (ImplicitCastExpr 'void (*)(rs_font *)' <FunctionToPointerDecay>
// (DeclRefExpr 'void (rs_font *)' FunctionDecl='rsClearObject'))
// (UnaryOperator 'rs_font *' prefix '&'
// (DeclRefExpr 'rs_font':'rs_font' Var='localFont')))
// Get address of targeted RS object
clang::Expr *AddrRefRSVar =
new(C) clang::UnaryOperator(RefRSVar,
clang::UO_AddrOf,
ClearObjectFDArgType,
clang::VK_RValue,
clang::OK_Ordinary,
Loc);
clang::Expr *RefRSClearObjectFD =
clang::DeclRefExpr::Create(C,
clang::NestedNameSpecifierLoc(),
clang::SourceLocation(),
ClearObjectFD,
false,
ClearObjectFD->getLocation(),
ClearObjectFDType,
clang::VK_RValue,
NULL);
clang::Expr *RSClearObjectFP =
clang::ImplicitCastExpr::Create(C,
C.getPointerType(ClearObjectFDType),
clang::CK_FunctionToPointerDecay,
RefRSClearObjectFD,
NULL,
clang::VK_RValue);
llvm::SmallVector<clang::Expr*, 1> ArgList;
ArgList.push_back(AddrRefRSVar);
clang::CallExpr *RSClearObjectCall =
new(C) clang::CallExpr(C,
RSClearObjectFP,
ArgList,
ClearObjectFD->getCallResultType(),
clang::VK_RValue,
Loc);
return RSClearObjectCall;
}
static int ArrayDim(const clang::Type *T) {
if (!T || !T->isArrayType()) {
return 0;
}
const clang::ConstantArrayType *CAT =
static_cast<const clang::ConstantArrayType *>(T);
return static_cast<int>(CAT->getSize().getSExtValue());
}
static clang::Stmt *ClearStructRSObject(
clang::ASTContext &C,
clang::DeclContext *DC,
clang::Expr *RefRSStruct,
clang::SourceLocation StartLoc,
clang::SourceLocation Loc);
static clang::Stmt *ClearArrayRSObject(
clang::ASTContext &C,
clang::DeclContext *DC,
clang::Expr *RefRSArr,
clang::SourceLocation StartLoc,
clang::SourceLocation Loc) {
const clang::Type *BaseType = RefRSArr->getType().getTypePtr();
slangAssert(BaseType->isArrayType());
int NumArrayElements = ArrayDim(BaseType);
// Actually extract out the base RS object type for use later
BaseType = BaseType->getArrayElementTypeNoTypeQual();
clang::Stmt *StmtArray[2] = {NULL};
int StmtCtr = 0;
if (NumArrayElements <= 0) {
return NULL;
}
// Example destructor loop for "rs_font fontArr[10];"
//
// (CompoundStmt
// (DeclStmt "int rsIntIter")
// (ForStmt
// (BinaryOperator 'int' '='
// (DeclRefExpr 'int' Var='rsIntIter')
// (IntegerLiteral 'int' 0))
// (BinaryOperator 'int' '<'
// (DeclRefExpr 'int' Var='rsIntIter')
// (IntegerLiteral 'int' 10)
// NULL << CondVar >>
// (UnaryOperator 'int' postfix '++'
// (DeclRefExpr 'int' Var='rsIntIter'))
// (CallExpr 'void'
// (ImplicitCastExpr 'void (*)(rs_font *)' <FunctionToPointerDecay>
// (DeclRefExpr 'void (rs_font *)' FunctionDecl='rsClearObject'))
// (UnaryOperator 'rs_font *' prefix '&'
// (ArraySubscriptExpr 'rs_font':'rs_font'
// (ImplicitCastExpr 'rs_font *' <ArrayToPointerDecay>
// (DeclRefExpr 'rs_font [10]' Var='fontArr'))
// (DeclRefExpr 'int' Var='rsIntIter')))))))
// Create helper variable for iterating through elements
clang::IdentifierInfo& II = C.Idents.get("rsIntIter");
clang::VarDecl *IIVD =
clang::VarDecl::Create(C,
DC,
StartLoc,
Loc,
&II,
C.IntTy,
C.getTrivialTypeSourceInfo(C.IntTy),
clang::SC_None);
clang::Decl *IID = (clang::Decl *)IIVD;
clang::DeclGroupRef DGR = clang::DeclGroupRef::Create(C, &IID, 1);
StmtArray[StmtCtr++] = new(C) clang::DeclStmt(DGR, Loc, Loc);
// Form the actual destructor loop
// for (Init; Cond; Inc)
// RSClearObjectCall;
// Init -> "rsIntIter = 0"
clang::DeclRefExpr *RefrsIntIter =
clang::DeclRefExpr::Create(C,
clang::NestedNameSpecifierLoc(),
clang::SourceLocation(),
IIVD,
false,
Loc,
C.IntTy,
clang::VK_RValue,
NULL);
clang::Expr *Int0 = clang::IntegerLiteral::Create(C,
llvm::APInt(C.getTypeSize(C.IntTy), 0), C.IntTy, Loc);
clang::BinaryOperator *Init =
new(C) clang::BinaryOperator(RefrsIntIter,
Int0,
clang::BO_Assign,
C.IntTy,
clang::VK_RValue,
clang::OK_Ordinary,
Loc,
false);
// Cond -> "rsIntIter < NumArrayElements"
clang::Expr *NumArrayElementsExpr = clang::IntegerLiteral::Create(C,
llvm::APInt(C.getTypeSize(C.IntTy), NumArrayElements), C.IntTy, Loc);
clang::BinaryOperator *Cond =
new(C) clang::BinaryOperator(RefrsIntIter,
NumArrayElementsExpr,
clang::BO_LT,
C.IntTy,
clang::VK_RValue,
clang::OK_Ordinary,
Loc,
false);
// Inc -> "rsIntIter++"
clang::UnaryOperator *Inc =
new(C) clang::UnaryOperator(RefrsIntIter,
clang::UO_PostInc,
C.IntTy,
clang::VK_RValue,
clang::OK_Ordinary,
Loc);
// Body -> "rsClearObject(&VD[rsIntIter]);"
// Destructor loop operates on individual array elements
clang::Expr *RefRSArrPtr =
clang::ImplicitCastExpr::Create(C,
C.getPointerType(BaseType->getCanonicalTypeInternal()),
clang::CK_ArrayToPointerDecay,
RefRSArr,
NULL,
clang::VK_RValue);
clang::Expr *RefRSArrPtrSubscript =
new(C) clang::ArraySubscriptExpr(RefRSArrPtr,
RefrsIntIter,
BaseType->getCanonicalTypeInternal(),
clang::VK_RValue,
clang::OK_Ordinary,
Loc);
DataType DT = RSExportPrimitiveType::GetRSSpecificType(BaseType);
clang::Stmt *RSClearObjectCall = NULL;
if (BaseType->isArrayType()) {
RSClearObjectCall =
ClearArrayRSObject(C, DC, RefRSArrPtrSubscript, StartLoc, Loc);
} else if (DT == DataTypeUnknown) {
RSClearObjectCall =
ClearStructRSObject(C, DC, RefRSArrPtrSubscript, StartLoc, Loc);
} else {
RSClearObjectCall = ClearSingleRSObject(C, RefRSArrPtrSubscript, Loc);
}
clang::ForStmt *DestructorLoop =
new(C) clang::ForStmt(C,
Init,
Cond,
NULL, // no condVar
Inc,
RSClearObjectCall,
Loc,
Loc,
Loc);
StmtArray[StmtCtr++] = DestructorLoop;
slangAssert(StmtCtr == 2);
clang::CompoundStmt *CS = new(C) clang::CompoundStmt(
C, llvm::makeArrayRef(StmtArray, StmtCtr), Loc, Loc);
return CS;
}
static unsigned CountRSObjectTypes(clang::ASTContext &C,
const clang::Type *T,
clang::SourceLocation Loc) {
slangAssert(T);
unsigned RSObjectCount = 0;
if (T->isArrayType()) {
return CountRSObjectTypes(C, T->getArrayElementTypeNoTypeQual(), Loc);
}
DataType DT = RSExportPrimitiveType::GetRSSpecificType(T);
if (DT != DataTypeUnknown) {
return (RSExportPrimitiveType::IsRSObjectType(DT) ? 1 : 0);
}
if (T->isUnionType()) {
clang::RecordDecl *RD = T->getAsUnionType()->getDecl();
RD = RD->getDefinition();
for (clang::RecordDecl::field_iterator FI = RD->field_begin(),
FE = RD->field_end();
FI != FE;
FI++) {
const clang::FieldDecl *FD = *FI;
const clang::Type *FT = RSExportType::GetTypeOfDecl(FD);
if (CountRSObjectTypes(C, FT, Loc)) {
slangAssert(false && "can't have unions with RS object types!");
return 0;
}
}
}
if (!T->isStructureType()) {
return 0;
}
clang::RecordDecl *RD = T->getAsStructureType()->getDecl();
RD = RD->getDefinition();
for (clang::RecordDecl::field_iterator FI = RD->field_begin(),
FE = RD->field_end();
FI != FE;
FI++) {
const clang::FieldDecl *FD = *FI;
const clang::Type *FT = RSExportType::GetTypeOfDecl(FD);
if (CountRSObjectTypes(C, FT, Loc)) {
// Sub-structs should only count once (as should arrays, etc.)
RSObjectCount++;
}
}
return RSObjectCount;
}
static clang::Stmt *ClearStructRSObject(
clang::ASTContext &C,
clang::DeclContext *DC,
clang::Expr *RefRSStruct,
clang::SourceLocation StartLoc,
clang::SourceLocation Loc) {
const clang::Type *BaseType = RefRSStruct->getType().getTypePtr();
slangAssert(!BaseType->isArrayType());
// Structs should show up as unknown primitive types
slangAssert(RSExportPrimitiveType::GetRSSpecificType(BaseType) ==
DataTypeUnknown);
unsigned FieldsToDestroy = CountRSObjectTypes(C, BaseType, Loc);
slangAssert(FieldsToDestroy != 0);
unsigned StmtCount = 0;
clang::Stmt **StmtArray = new clang::Stmt*[FieldsToDestroy];
for (unsigned i = 0; i < FieldsToDestroy; i++) {
StmtArray[i] = NULL;
}
// Populate StmtArray by creating a destructor for each RS object field
clang::RecordDecl *RD = BaseType->getAsStructureType()->getDecl();
RD = RD->getDefinition();
for (clang::RecordDecl::field_iterator FI = RD->field_begin(),
FE = RD->field_end();
FI != FE;
FI++) {
// We just look through all field declarations to see if we find a
// declaration for an RS object type (or an array of one).
bool IsArrayType = false;
clang::FieldDecl *FD = *FI;
const clang::Type *FT = RSExportType::GetTypeOfDecl(FD);
const clang::Type *OrigType = FT;
while (FT && FT->isArrayType()) {
FT = FT->getArrayElementTypeNoTypeQual();
IsArrayType = true;
}
if (RSExportPrimitiveType::IsRSObjectType(FT)) {
clang::DeclAccessPair FoundDecl =
clang::DeclAccessPair::make(FD, clang::AS_none);
clang::MemberExpr *RSObjectMember =
clang::MemberExpr::Create(C,
RefRSStruct,
false,
clang::NestedNameSpecifierLoc(),
clang::SourceLocation(),
FD,
FoundDecl,
clang::DeclarationNameInfo(),
NULL,
OrigType->getCanonicalTypeInternal(),
clang::VK_RValue,
clang::OK_Ordinary);
slangAssert(StmtCount < FieldsToDestroy);
if (IsArrayType) {
StmtArray[StmtCount++] = ClearArrayRSObject(C,
DC,
RSObjectMember,
StartLoc,
Loc);
} else {
StmtArray[StmtCount++] = ClearSingleRSObject(C,
RSObjectMember,
Loc);
}
} else if (FT->isStructureType() && CountRSObjectTypes(C, FT, Loc)) {
// In this case, we have a nested struct. We may not end up filling all
// of the spaces in StmtArray (sub-structs should handle themselves
// with separate compound statements).
clang::DeclAccessPair FoundDecl =
clang::DeclAccessPair::make(FD, clang::AS_none);
clang::MemberExpr *RSObjectMember =
clang::MemberExpr::Create(C,
RefRSStruct,
false,
clang::NestedNameSpecifierLoc(),
clang::SourceLocation(),
FD,
FoundDecl,
clang::DeclarationNameInfo(),
NULL,
OrigType->getCanonicalTypeInternal(),
clang::VK_RValue,
clang::OK_Ordinary);
if (IsArrayType) {
StmtArray[StmtCount++] = ClearArrayRSObject(C,
DC,
RSObjectMember,
StartLoc,
Loc);
} else {
StmtArray[StmtCount++] = ClearStructRSObject(C,
DC,
RSObjectMember,
StartLoc,
Loc);
}
}
}
slangAssert(StmtCount > 0);
clang::CompoundStmt *CS = new(C) clang::CompoundStmt(
C, llvm::makeArrayRef(StmtArray, StmtCount), Loc, Loc);
delete [] StmtArray;
return CS;
}
static clang::Stmt *CreateSingleRSSetObject(clang::ASTContext &C,
clang::Expr *DstExpr,
clang::Expr *SrcExpr,
clang::SourceLocation StartLoc,
clang::SourceLocation Loc) {
const clang::Type *T = DstExpr->getType().getTypePtr();
clang::FunctionDecl *SetObjectFD = RSObjectRefCount::GetRSSetObjectFD(T);
slangAssert((SetObjectFD != NULL) &&
"rsSetObject doesn't cover all RS object types");
clang::QualType SetObjectFDType = SetObjectFD->getType();
clang::QualType SetObjectFDArgType[2];
SetObjectFDArgType[0] = SetObjectFD->getParamDecl(0)->getOriginalType();
SetObjectFDArgType[1] = SetObjectFD->getParamDecl(1)->getOriginalType();
clang::Expr *RefRSSetObjectFD =
clang::DeclRefExpr::Create(C,
clang::NestedNameSpecifierLoc(),
clang::SourceLocation(),
SetObjectFD,
false,
Loc,
SetObjectFDType,
clang::VK_RValue,
NULL);
clang::Expr *RSSetObjectFP =
clang::ImplicitCastExpr::Create(C,
C.getPointerType(SetObjectFDType),
clang::CK_FunctionToPointerDecay,
RefRSSetObjectFD,
NULL,
clang::VK_RValue);
llvm::SmallVector<clang::Expr*, 2> ArgList;
ArgList.push_back(new(C) clang::UnaryOperator(DstExpr,
clang::UO_AddrOf,
SetObjectFDArgType[0],
clang::VK_RValue,
clang::OK_Ordinary,
Loc));
ArgList.push_back(SrcExpr);
clang::CallExpr *RSSetObjectCall =
new(C) clang::CallExpr(C,
RSSetObjectFP,
ArgList,
SetObjectFD->getCallResultType(),
clang::VK_RValue,
Loc);
return RSSetObjectCall;
}
static clang::Stmt *CreateStructRSSetObject(clang::ASTContext &C,
clang::Expr *LHS,
clang::Expr *RHS,
clang::SourceLocation StartLoc,
clang::SourceLocation Loc);
/*static clang::Stmt *CreateArrayRSSetObject(clang::ASTContext &C,
clang::Expr *DstArr,
clang::Expr *SrcArr,
clang::SourceLocation StartLoc,
clang::SourceLocation Loc) {
clang::DeclContext *DC = NULL;
const clang::Type *BaseType = DstArr->getType().getTypePtr();
slangAssert(BaseType->isArrayType());
int NumArrayElements = ArrayDim(BaseType);
// Actually extract out the base RS object type for use later
BaseType = BaseType->getArrayElementTypeNoTypeQual();
clang::Stmt *StmtArray[2] = {NULL};
int StmtCtr = 0;
if (NumArrayElements <= 0) {
return NULL;
}
// Create helper variable for iterating through elements
clang::IdentifierInfo& II = C.Idents.get("rsIntIter");
clang::VarDecl *IIVD =
clang::VarDecl::Create(C,
DC,
StartLoc,
Loc,
&II,
C.IntTy,
C.getTrivialTypeSourceInfo(C.IntTy),
clang::SC_None,
clang::SC_None);
clang::Decl *IID = (clang::Decl *)IIVD;
clang::DeclGroupRef DGR = clang::DeclGroupRef::Create(C, &IID, 1);
StmtArray[StmtCtr++] = new(C) clang::DeclStmt(DGR, Loc, Loc);
// Form the actual loop
// for (Init; Cond; Inc)
// RSSetObjectCall;
// Init -> "rsIntIter = 0"
clang::DeclRefExpr *RefrsIntIter =
clang::DeclRefExpr::Create(C,
clang::NestedNameSpecifierLoc(),
IIVD,
Loc,
C.IntTy,
clang::VK_RValue,
NULL);
clang::Expr *Int0 = clang::IntegerLiteral::Create(C,
llvm::APInt(C.getTypeSize(C.IntTy), 0), C.IntTy, Loc);
clang::BinaryOperator *Init =
new(C) clang::BinaryOperator(RefrsIntIter,
Int0,
clang::BO_Assign,
C.IntTy,
clang::VK_RValue,
clang::OK_Ordinary,
Loc);
// Cond -> "rsIntIter < NumArrayElements"
clang::Expr *NumArrayElementsExpr = clang::IntegerLiteral::Create(C,
llvm::APInt(C.getTypeSize(C.IntTy), NumArrayElements), C.IntTy, Loc);
clang::BinaryOperator *Cond =
new(C) clang::BinaryOperator(RefrsIntIter,
NumArrayElementsExpr,
clang::BO_LT,
C.IntTy,
clang::VK_RValue,
clang::OK_Ordinary,
Loc);
// Inc -> "rsIntIter++"
clang::UnaryOperator *Inc =
new(C) clang::UnaryOperator(RefrsIntIter,
clang::UO_PostInc,
C.IntTy,
clang::VK_RValue,
clang::OK_Ordinary,
Loc);
// Body -> "rsSetObject(&Dst[rsIntIter], Src[rsIntIter]);"
// Loop operates on individual array elements
clang::Expr *DstArrPtr =
clang::ImplicitCastExpr::Create(C,
C.getPointerType(BaseType->getCanonicalTypeInternal()),
clang::CK_ArrayToPointerDecay,
DstArr,
NULL,
clang::VK_RValue);
clang::Expr *DstArrPtrSubscript =
new(C) clang::ArraySubscriptExpr(DstArrPtr,
RefrsIntIter,
BaseType->getCanonicalTypeInternal(),
clang::VK_RValue,
clang::OK_Ordinary,
Loc);
clang::Expr *SrcArrPtr =
clang::ImplicitCastExpr::Create(C,
C.getPointerType(BaseType->getCanonicalTypeInternal()),
clang::CK_ArrayToPointerDecay,
SrcArr,
NULL,
clang::VK_RValue);
clang::Expr *SrcArrPtrSubscript =
new(C) clang::ArraySubscriptExpr(SrcArrPtr,
RefrsIntIter,
BaseType->getCanonicalTypeInternal(),
clang::VK_RValue,
clang::OK_Ordinary,
Loc);
DataType DT = RSExportPrimitiveType::GetRSSpecificType(BaseType);
clang::Stmt *RSSetObjectCall = NULL;
if (BaseType->isArrayType()) {
RSSetObjectCall = CreateArrayRSSetObject(C, DstArrPtrSubscript,
SrcArrPtrSubscript,
StartLoc, Loc);
} else if (DT == DataTypeUnknown) {
RSSetObjectCall = CreateStructRSSetObject(C, DstArrPtrSubscript,
SrcArrPtrSubscript,
StartLoc, Loc);
} else {
RSSetObjectCall = CreateSingleRSSetObject(C, DstArrPtrSubscript,
SrcArrPtrSubscript,
StartLoc, Loc);
}
clang::ForStmt *DestructorLoop =
new(C) clang::ForStmt(C,
Init,
Cond,
NULL, // no condVar
Inc,
RSSetObjectCall,
Loc,
Loc,
Loc);
StmtArray[StmtCtr++] = DestructorLoop;
slangAssert(StmtCtr == 2);
clang::CompoundStmt *CS =
new(C) clang::CompoundStmt(C, StmtArray, StmtCtr, Loc, Loc);
return CS;
} */
static clang::Stmt *CreateStructRSSetObject(clang::ASTContext &C,
clang::Expr *LHS,
clang::Expr *RHS,
clang::SourceLocation StartLoc,
clang::SourceLocation Loc) {
clang::QualType QT = LHS->getType();
const clang::Type *T = QT.getTypePtr();
slangAssert(T->isStructureType());
slangAssert(!RSExportPrimitiveType::IsRSObjectType(T));
// Keep an extra slot for the original copy (memcpy)
unsigned FieldsToSet = CountRSObjectTypes(C, T, Loc) + 1;
unsigned StmtCount = 0;
clang::Stmt **StmtArray = new clang::Stmt*[FieldsToSet];
for (unsigned i = 0; i < FieldsToSet; i++) {
StmtArray[i] = NULL;
}
clang::RecordDecl *RD = T->getAsStructureType()->getDecl();
RD = RD->getDefinition();
for (clang::RecordDecl::field_iterator FI = RD->field_begin(),
FE = RD->field_end();
FI != FE;
FI++) {
bool IsArrayType = false;
clang::FieldDecl *FD = *FI;
const clang::Type *FT = RSExportType::GetTypeOfDecl(FD);
const clang::Type *OrigType = FT;
if (!CountRSObjectTypes(C, FT, Loc)) {
// Skip to next if we don't have any viable RS object types
continue;
}
clang::DeclAccessPair FoundDecl =
clang::DeclAccessPair::make(FD, clang::AS_none);
clang::MemberExpr *DstMember =
clang::MemberExpr::Create(C,
LHS,
false,
clang::NestedNameSpecifierLoc(),
clang::SourceLocation(),
FD,
FoundDecl,
clang::DeclarationNameInfo(),
NULL,
OrigType->getCanonicalTypeInternal(),
clang::VK_RValue,
clang::OK_Ordinary);
clang::MemberExpr *SrcMember =
clang::MemberExpr::Create(C,
RHS,
false,
clang::NestedNameSpecifierLoc(),
clang::SourceLocation(),
FD,
FoundDecl,
clang::DeclarationNameInfo(),
NULL,
OrigType->getCanonicalTypeInternal(),
clang::VK_RValue,
clang::OK_Ordinary);
if (FT->isArrayType()) {
FT = FT->getArrayElementTypeNoTypeQual();
IsArrayType = true;
}
DataType DT = RSExportPrimitiveType::GetRSSpecificType(FT);
if (IsArrayType) {
clang::DiagnosticsEngine &DiagEngine = C.getDiagnostics();
DiagEngine.Report(
clang::FullSourceLoc(Loc, C.getSourceManager()),
DiagEngine.getCustomDiagID(
clang::DiagnosticsEngine::Error,
"Arrays of RS object types within structures cannot be copied"));
// TODO(srhines): Support setting arrays of RS objects
// StmtArray[StmtCount++] =
// CreateArrayRSSetObject(C, DstMember, SrcMember, StartLoc, Loc);
} else if (DT == DataTypeUnknown) {
StmtArray[StmtCount++] =
CreateStructRSSetObject(C, DstMember, SrcMember, StartLoc, Loc);
} else if (RSExportPrimitiveType::IsRSObjectType(DT)) {
StmtArray[StmtCount++] =
CreateSingleRSSetObject(C, DstMember, SrcMember, StartLoc, Loc);
} else {
slangAssert(false);
}
}
slangAssert(StmtCount < FieldsToSet);
// We still need to actually do the overall struct copy. For simplicity,
// we just do a straight-up assignment (which will still preserve all
// the proper RS object reference counts).
clang::BinaryOperator *CopyStruct =
new(C) clang::BinaryOperator(LHS, RHS, clang::BO_Assign, QT,
clang::VK_RValue, clang::OK_Ordinary, Loc,
false);
StmtArray[StmtCount++] = CopyStruct;
clang::CompoundStmt *CS = new(C) clang::CompoundStmt(
C, llvm::makeArrayRef(StmtArray, StmtCount), Loc, Loc);
delete [] StmtArray;
return CS;
}
} // namespace
void RSObjectRefCount::Scope::ReplaceRSObjectAssignment(
clang::BinaryOperator *AS) {
clang::QualType QT = AS->getType();
clang::ASTContext &C = RSObjectRefCount::GetRSSetObjectFD(
DataTypeRSAllocation)->getASTContext();
clang::SourceLocation Loc = AS->getExprLoc();
clang::SourceLocation StartLoc = AS->getLHS()->getExprLoc();
clang::Stmt *UpdatedStmt = NULL;
if (!RSExportPrimitiveType::IsRSObjectType(QT.getTypePtr())) {
// By definition, this is a struct assignment if we get here
UpdatedStmt =
CreateStructRSSetObject(C, AS->getLHS(), AS->getRHS(), StartLoc, Loc);
} else {
UpdatedStmt =
CreateSingleRSSetObject(C, AS->getLHS(), AS->getRHS(), StartLoc, Loc);
}
RSASTReplace R(C);
R.ReplaceStmt(mCS, AS, UpdatedStmt);
}
void RSObjectRefCount::Scope::AppendRSObjectInit(
clang::VarDecl *VD,
clang::DeclStmt *DS,
DataType DT,
clang::Expr *InitExpr) {
slangAssert(VD);
if (!InitExpr) {
return;
}
clang::ASTContext &C = RSObjectRefCount::GetRSSetObjectFD(
DataTypeRSAllocation)->getASTContext();
clang::SourceLocation Loc = RSObjectRefCount::GetRSSetObjectFD(
DataTypeRSAllocation)->getLocation();
clang::SourceLocation StartLoc = RSObjectRefCount::GetRSSetObjectFD(
DataTypeRSAllocation)->getInnerLocStart();
if (DT == DataTypeIsStruct) {
const clang::Type *T = RSExportType::GetTypeOfDecl(VD);
clang::DeclRefExpr *RefRSVar =
clang::DeclRefExpr::Create(C,
clang::NestedNameSpecifierLoc(),
clang::SourceLocation(),
VD,
false,
Loc,
T->getCanonicalTypeInternal(),
clang::VK_RValue,
NULL);
clang::Stmt *RSSetObjectOps =
CreateStructRSSetObject(C, RefRSVar, InitExpr, StartLoc, Loc);
std::list<clang::Stmt*> StmtList;
StmtList.push_back(RSSetObjectOps);
AppendAfterStmt(C, mCS, DS, StmtList);
return;
}
clang::FunctionDecl *SetObjectFD = RSObjectRefCount::GetRSSetObjectFD(DT);
slangAssert((SetObjectFD != NULL) &&
"rsSetObject doesn't cover all RS object types");
clang::QualType SetObjectFDType = SetObjectFD->getType();
clang::QualType SetObjectFDArgType[2];
SetObjectFDArgType[0] = SetObjectFD->getParamDecl(0)->getOriginalType();
SetObjectFDArgType[1] = SetObjectFD->getParamDecl(1)->getOriginalType();
clang::Expr *RefRSSetObjectFD =
clang::DeclRefExpr::Create(C,
clang::NestedNameSpecifierLoc(),
clang::SourceLocation(),
SetObjectFD,
false,
Loc,
SetObjectFDType,
clang::VK_RValue,
NULL);
clang::Expr *RSSetObjectFP =
clang::ImplicitCastExpr::Create(C,
C.getPointerType(SetObjectFDType),
clang::CK_FunctionToPointerDecay,
RefRSSetObjectFD,
NULL,
clang::VK_RValue);
const clang::Type *T = RSExportType::GetTypeOfDecl(VD);
clang::DeclRefExpr *RefRSVar =
clang::DeclRefExpr::Create(C,
clang::NestedNameSpecifierLoc(),
clang::SourceLocation(),
VD,
false,
Loc,
T->getCanonicalTypeInternal(),
clang::VK_RValue,
NULL);
llvm::SmallVector<clang::Expr*, 2> ArgList;
ArgList.push_back(new(C) clang::UnaryOperator(RefRSVar,
clang::UO_AddrOf,
SetObjectFDArgType[0],
clang::VK_RValue,
clang::OK_Ordinary,
Loc));
ArgList.push_back(InitExpr);
clang::CallExpr *RSSetObjectCall =
new(C) clang::CallExpr(C,
RSSetObjectFP,
ArgList,
SetObjectFD->getCallResultType(),
clang::VK_RValue,
Loc);
std::list<clang::Stmt*> StmtList;
StmtList.push_back(RSSetObjectCall);
AppendAfterStmt(C, mCS, DS, StmtList);
}
void RSObjectRefCount::Scope::InsertLocalVarDestructors() {
for (std::list<clang::VarDecl*>::const_iterator I = mRSO.begin(),
E = mRSO.end();
I != E;
I++) {
clang::VarDecl *VD = *I;
clang::Stmt *RSClearObjectCall = ClearRSObject(VD, VD->getDeclContext());
if (RSClearObjectCall) {
DestructorVisitor DV((*mRSO.begin())->getASTContext(),
mCS,
RSClearObjectCall,
VD->getSourceRange().getBegin());
DV.Visit(mCS);
DV.InsertDestructors();
}
}
}
clang::Stmt *RSObjectRefCount::Scope::ClearRSObject(
clang::VarDecl *VD,
clang::DeclContext *DC) {
slangAssert(VD);
clang::ASTContext &C = VD->getASTContext();
clang::SourceLocation Loc = VD->getLocation();
clang::SourceLocation StartLoc = VD->getInnerLocStart();
const clang::Type *T = RSExportType::GetTypeOfDecl(VD);
// Reference expr to target RS object variable
clang::DeclRefExpr *RefRSVar =
clang::DeclRefExpr::Create(C,
clang::NestedNameSpecifierLoc(),
clang::SourceLocation(),
VD,
false,
Loc,
T->getCanonicalTypeInternal(),
clang::VK_RValue,
NULL);
if (T->isArrayType()) {
return ClearArrayRSObject(C, DC, RefRSVar, StartLoc, Loc);
}
DataType DT = RSExportPrimitiveType::GetRSSpecificType(T);
if (DT == DataTypeUnknown ||
DT == DataTypeIsStruct) {
return ClearStructRSObject(C, DC, RefRSVar, StartLoc, Loc);
}
slangAssert((RSExportPrimitiveType::IsRSObjectType(DT)) &&
"Should be RS object");
return ClearSingleRSObject(C, RefRSVar, Loc);
}
bool RSObjectRefCount::InitializeRSObject(clang::VarDecl *VD,
DataType *DT,
clang::Expr **InitExpr) {
slangAssert(VD && DT && InitExpr);
const clang::Type *T = RSExportType::GetTypeOfDecl(VD);
// Loop through array types to get to base type
while (T && T->isArrayType()) {
T = T->getArrayElementTypeNoTypeQual();
}
bool DataTypeIsStructWithRSObject = false;
*DT = RSExportPrimitiveType::GetRSSpecificType(T);
if (*DT == DataTypeUnknown) {
if (RSExportPrimitiveType::IsStructureTypeWithRSObject(T)) {
*DT = DataTypeIsStruct;
DataTypeIsStructWithRSObject = true;
} else {
return false;
}
}
bool DataTypeIsRSObject = false;
if (DataTypeIsStructWithRSObject) {
DataTypeIsRSObject = true;
} else {
DataTypeIsRSObject = RSExportPrimitiveType::IsRSObjectType(*DT);
}
*InitExpr = VD->getInit();
if (!DataTypeIsRSObject && *InitExpr) {
// If we already have an initializer for a matrix type, we are done.
return DataTypeIsRSObject;
}
clang::Expr *ZeroInitializer =
CreateZeroInitializerForRSSpecificType(*DT,
VD->getASTContext(),
VD->getLocation());
if (ZeroInitializer) {
ZeroInitializer->setType(T->getCanonicalTypeInternal());
VD->setInit(ZeroInitializer);
}
return DataTypeIsRSObject;
}
clang::Expr *RSObjectRefCount::CreateZeroInitializerForRSSpecificType(
DataType DT,
clang::ASTContext &C,
const clang::SourceLocation &Loc) {
clang::Expr *Res = NULL;
switch (DT) {
case DataTypeIsStruct:
case DataTypeRSElement:
case DataTypeRSType:
case DataTypeRSAllocation:
case DataTypeRSSampler:
case DataTypeRSScript:
case DataTypeRSMesh:
case DataTypeRSPath:
case DataTypeRSProgramFragment:
case DataTypeRSProgramVertex:
case DataTypeRSProgramRaster:
case DataTypeRSProgramStore:
case DataTypeRSFont: {
// (ImplicitCastExpr 'nullptr_t'
// (IntegerLiteral 0)))
llvm::APInt Zero(C.getTypeSize(C.IntTy), 0);
clang::Expr *Int0 = clang::IntegerLiteral::Create(C, Zero, C.IntTy, Loc);
clang::Expr *CastToNull =
clang::ImplicitCastExpr::Create(C,
C.NullPtrTy,
clang::CK_IntegralToPointer,
Int0,
NULL,
clang::VK_RValue);
llvm::SmallVector<clang::Expr*, 1>InitList;
InitList.push_back(CastToNull);
Res = new(C) clang::InitListExpr(C, Loc, InitList, Loc);
break;
}
case DataTypeRSMatrix2x2:
case DataTypeRSMatrix3x3:
case DataTypeRSMatrix4x4: {
// RS matrix is not completely an RS object. They hold data by themselves.
// (InitListExpr rs_matrix2x2
// (InitListExpr float[4]
// (FloatingLiteral 0)
// (FloatingLiteral 0)
// (FloatingLiteral 0)
// (FloatingLiteral 0)))
clang::QualType FloatTy = C.FloatTy;
// Constructor sets value to 0.0f by default
llvm::APFloat Val(C.getFloatTypeSemantics(FloatTy));
clang::FloatingLiteral *Float0Val =
clang::FloatingLiteral::Create(C,
Val,
/* isExact = */true,
FloatTy,
Loc);
unsigned N = 0;
if (DT == DataTypeRSMatrix2x2)
N = 2;
else if (DT == DataTypeRSMatrix3x3)
N = 3;
else if (DT == DataTypeRSMatrix4x4)
N = 4;
unsigned N_2 = N * N;
// Assume we are going to be allocating 16 elements, since 4x4 is max.
llvm::SmallVector<clang::Expr*, 16> InitVals;
for (unsigned i = 0; i < N_2; i++)
InitVals.push_back(Float0Val);
clang::Expr *InitExpr =
new(C) clang::InitListExpr(C, Loc, InitVals, Loc);
InitExpr->setType(C.getConstantArrayType(FloatTy,
llvm::APInt(32, N_2),
clang::ArrayType::Normal,
/* EltTypeQuals = */0));
llvm::SmallVector<clang::Expr*, 1> InitExprVec;
InitExprVec.push_back(InitExpr);
Res = new(C) clang::InitListExpr(C, Loc, InitExprVec, Loc);
break;
}
case DataTypeUnknown:
case DataTypeFloat16:
case DataTypeFloat32:
case DataTypeFloat64:
case DataTypeSigned8:
case DataTypeSigned16:
case DataTypeSigned32:
case DataTypeSigned64:
case DataTypeUnsigned8:
case DataTypeUnsigned16:
case DataTypeUnsigned32:
case DataTypeUnsigned64:
case DataTypeBoolean:
case DataTypeUnsigned565:
case DataTypeUnsigned5551:
case DataTypeUnsigned4444:
case DataTypeMax: {
slangAssert(false && "Not RS object type!");
}
// No default case will enable compiler detecting the missing cases
}
return Res;
}
void RSObjectRefCount::VisitDeclStmt(clang::DeclStmt *DS) {
for (clang::DeclStmt::decl_iterator I = DS->decl_begin(), E = DS->decl_end();
I != E;
I++) {
clang::Decl *D = *I;
if (D->getKind() == clang::Decl::Var) {
clang::VarDecl *VD = static_cast<clang::VarDecl*>(D);
DataType DT = DataTypeUnknown;
clang::Expr *InitExpr = NULL;
if (InitializeRSObject(VD, &DT, &InitExpr)) {
// We need to zero-init all RS object types (including matrices), ...
getCurrentScope()->AppendRSObjectInit(VD, DS, DT, InitExpr);
// ... but, only add to the list of RS objects if we have some
// non-matrix RS object fields.
if (CountRSObjectTypes(mCtx, VD->getType().getTypePtr(),
VD->getLocation())) {
getCurrentScope()->addRSObject(VD);
}
}
}
}
}
void RSObjectRefCount::VisitCompoundStmt(clang::CompoundStmt *CS) {
if (!CS->body_empty()) {
// Push a new scope
Scope *S = new Scope(CS);
mScopeStack.push(S);
VisitStmt(CS);
// Destroy the scope
slangAssert((getCurrentScope() == S) && "Corrupted scope stack!");
S->InsertLocalVarDestructors();
mScopeStack.pop();
delete S;
}
}
void RSObjectRefCount::VisitBinAssign(clang::BinaryOperator *AS) {
clang::QualType QT = AS->getType();
if (CountRSObjectTypes(mCtx, QT.getTypePtr(), AS->getExprLoc())) {
getCurrentScope()->ReplaceRSObjectAssignment(AS);
}
}
void RSObjectRefCount::VisitStmt(clang::Stmt *S) {
for (clang::Stmt::child_iterator I = S->child_begin(), E = S->child_end();
I != E;
I++) {
if (clang::Stmt *Child = *I) {
Visit(Child);
}
}
}
// This function walks the list of global variables and (potentially) creates
// a single global static destructor function that properly decrements
// reference counts on the contained RS object types.
clang::FunctionDecl *RSObjectRefCount::CreateStaticGlobalDtor() {
Init();
clang::DeclContext *DC = mCtx.getTranslationUnitDecl();
clang::SourceLocation loc;
llvm::StringRef SR(".rs.dtor");
clang::IdentifierInfo &II = mCtx.Idents.get(SR);
clang::DeclarationName N(&II);
clang::FunctionProtoType::ExtProtoInfo EPI;
clang::QualType T = mCtx.getFunctionType(mCtx.VoidTy,
llvm::ArrayRef<clang::QualType>(), EPI);
clang::FunctionDecl *FD = NULL;
// Generate rsClearObject() call chains for every global variable
// (whether static or extern).
std::list<clang::Stmt *> StmtList;
for (clang::DeclContext::decl_iterator I = DC->decls_begin(),
E = DC->decls_end(); I != E; I++) {
clang::VarDecl *VD = llvm::dyn_cast<clang::VarDecl>(*I);
if (VD) {
if (CountRSObjectTypes(mCtx, VD->getType().getTypePtr(), loc)) {
if (!FD) {
// Only create FD if we are going to use it.
FD = clang::FunctionDecl::Create(mCtx, DC, loc, loc, N, T, NULL,
clang::SC_None);
}
// Make sure to create any helpers within the function's DeclContext,
// not the one associated with the global translation unit.
clang::Stmt *RSClearObjectCall = Scope::ClearRSObject(VD, FD);
StmtList.push_back(RSClearObjectCall);
}
}
}
// Nothing needs to be destroyed, so don't emit a dtor.
if (StmtList.empty()) {
return NULL;
}
clang::CompoundStmt *CS = BuildCompoundStmt(mCtx, StmtList, loc);
FD->setBody(CS);
return FD;
}
} // namespace slang