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slang_rs_object_ref_count.cpp
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slang_rs_object_ref_count.cpp
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/*
* 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 {
clang::FunctionDecl *RSObjectRefCount::
RSSetObjectFD[RSExportPrimitiveType::LastRSObjectType -
RSExportPrimitiveType::FirstRSObjectType + 1];
clang::FunctionDecl *RSObjectRefCount::
RSClearObjectFD[RSExportPrimitiveType::LastRSObjectType -
RSExportPrimitiveType::FirstRSObjectType + 1];
void RSObjectRefCount::GetRSRefCountingFunctions(clang::ASTContext &C) {
for (unsigned i = 0;
i < (sizeof(RSClearObjectFD) / sizeof(clang::FunctionDecl*));
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();
RSExportPrimitiveType::DataType DT =
RSExportPrimitiveType::GetRSSpecificType(RST.getTypePtr());
slangAssert(RSExportPrimitiveType::IsRSObjectType(DT)
&& "must be RS object type");
RSObjectFD[(DT - RSExportPrimitiveType::FirstRSObjectType)] = FD;
}
}
}
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,
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;
return;
}
// 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) {
return;
}
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);
}
}
return;
}
void DestructorVisitor::VisitCompoundStmt(clang::CompoundStmt *CS) {
VisitStmt(CS);
return;
}
void DestructorVisitor::VisitBreakStmt(clang::BreakStmt *BS) {
VisitStmt(BS);
if ((mLoopDepth == 0) && (mSwitchDepth == 0)) {
mReplaceStmtStack.push(BS);
}
return;
}
void DestructorVisitor::VisitCaseStmt(clang::CaseStmt *CS) {
VisitStmt(CS);
return;
}
void DestructorVisitor::VisitContinueStmt(clang::ContinueStmt *CS) {
VisitStmt(CS);
if (mLoopDepth == 0) {
// Switch statements can have nested continues.
mReplaceStmtStack.push(CS);
}
return;
}
void DestructorVisitor::VisitDefaultStmt(clang::DefaultStmt *DS) {
VisitStmt(DS);
return;
}
void DestructorVisitor::VisitDoStmt(clang::DoStmt *DS) {
mLoopDepth++;
VisitStmt(DS);
mLoopDepth--;
return;
}
void DestructorVisitor::VisitForStmt(clang::ForStmt *FS) {
mLoopDepth++;
VisitStmt(FS);
mLoopDepth--;
return;
}
void DestructorVisitor::VisitIfStmt(clang::IfStmt *IS) {
VisitStmt(IS);
return;
}
void DestructorVisitor::VisitReturnStmt(clang::ReturnStmt *RS) {
mReplaceStmtStack.push(RS);
return;
}
void DestructorVisitor::VisitSwitchCase(clang::SwitchCase *SC) {
slangAssert(false && "Both case and default have specialized handlers");
VisitStmt(SC);
return;
}
void DestructorVisitor::VisitSwitchStmt(clang::SwitchStmt *SS) {
mSwitchDepth++;
VisitStmt(SS);
mSwitchDepth--;
return;
}
void DestructorVisitor::VisitWhileStmt(clang::WhileStmt *WS) {
mLoopDepth++;
VisitStmt(WS);
mLoopDepth--;
return;
}
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(),
ClearObjectFD,
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);
clang::CallExpr *RSClearObjectCall =
new(C) clang::CallExpr(C,
RSClearObjectFP,
&AddrRefRSVar,
1,
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::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(),
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 -> "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);
RSExportPrimitiveType::DataType DT =
RSExportPrimitiveType::GetRSSpecificType(BaseType);
clang::Stmt *RSClearObjectCall = NULL;
if (BaseType->isArrayType()) {
RSClearObjectCall =
ClearArrayRSObject(C, DC, RefRSArrPtrSubscript, StartLoc, Loc);
} else if (DT == RSExportPrimitiveType::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, 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);
}
RSExportPrimitiveType::DataType DT =
RSExportPrimitiveType::GetRSSpecificType(T);
if (DT != RSExportPrimitiveType::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) ==
RSExportPrimitiveType::DataTypeUnknown);
unsigned FieldsToDestroy = CountRSObjectTypes(C, BaseType, Loc);
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(),
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(),
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, 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(),
SetObjectFD,
Loc,
SetObjectFDType,
clang::VK_RValue,
NULL);
clang::Expr *RSSetObjectFP =
clang::ImplicitCastExpr::Create(C,
C.getPointerType(SetObjectFDType),
clang::CK_FunctionToPointerDecay,
RefRSSetObjectFD,
NULL,
clang::VK_RValue);
clang::Expr *ArgList[2];
ArgList[0] = new(C) clang::UnaryOperator(DstExpr,
clang::UO_AddrOf,
SetObjectFDArgType[0],
clang::VK_RValue,
clang::OK_Ordinary,
Loc);
ArgList[1] = SrcExpr;
clang::CallExpr *RSSetObjectCall =
new(C) clang::CallExpr(C,
RSSetObjectFP,
ArgList,
2,
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);
RSExportPrimitiveType::DataType DT =
RSExportPrimitiveType::GetRSSpecificType(BaseType);
clang::Stmt *RSSetObjectCall = NULL;
if (BaseType->isArrayType()) {
RSSetObjectCall = CreateArrayRSSetObject(C, DstArrPtrSubscript,
SrcArrPtrSubscript,
StartLoc, Loc);
} else if (DT == RSExportPrimitiveType::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));