Add faux-body support for dispatch_once().

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@164348 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ted Kremenek 2012-09-21 00:52:24 +00:00
Родитель 4c919eb0c0
Коммит cc85d217d3
2 изменённых файлов: 422 добавлений и 10 удалений

Просмотреть файл

@ -22,6 +22,113 @@ using namespace clang;
typedef Stmt *(*FunctionFarmer)(ASTContext &C, const FunctionDecl *D);
static bool isDispatchBlock(QualType Ty) {
// Is it a block pointer?
const BlockPointerType *BPT = Ty->getAs<BlockPointerType>();
if (!BPT)
return false;
// Check if the block pointer type takes no arguments and
// returns void.
const FunctionProtoType *FT =
BPT->getPointeeType()->getAs<FunctionProtoType>();
if (!FT || !FT->getResultType()->isVoidType() ||
FT->getNumArgs() != 0)
return false;
return true;
}
/// Create a fake body for dispatch_once.
static Stmt *create_dispatch_once(ASTContext &C, const FunctionDecl *D) {
// Check if we have at least two parameters.
if (D->param_size() != 2)
return 0;
// Check if the first parameter is a pointer to integer type.
const ParmVarDecl *Predicate = D->getParamDecl(0);
QualType PredicateQPtrTy = Predicate->getType();
const PointerType *PredicatePtrTy = PredicateQPtrTy->getAs<PointerType>();
if (!PredicatePtrTy)
return 0;
QualType PredicateTy = PredicatePtrTy->getPointeeType();
if (!PredicateTy->isIntegerType())
return 0;
// Check if the second parameter is the proper block type.
const ParmVarDecl *Block = D->getParamDecl(1);
QualType Ty = Block->getType();
if (!isDispatchBlock(Ty))
return 0;
// Everything checks out. Create a fakse body that checks the predicate,
// sets it, and calls the block. Basically, an AST dump of:
//
// void dispatch_once(dispatch_once_t *predicate, dispatch_block_t block) {
// if (!*predicate) {
// *predicate = 1;
// block();
// }
// }
// (1) Create the call.
DeclRefExpr *DR = DeclRefExpr::CreateEmpty(C, false, false, false, false);
DR->setDecl(const_cast<ParmVarDecl*>(Block));
DR->setType(Ty);
DR->setValueKind(VK_LValue);
ImplicitCastExpr *ICE = ImplicitCastExpr::Create(C, Ty, CK_LValueToRValue,
DR, 0, VK_RValue);
CallExpr *CE = new (C) CallExpr(C, ICE, ArrayRef<Expr*>(), C.VoidTy,
VK_RValue, SourceLocation());
// (2) Create the assignment to the predicate.
IntegerLiteral *IL =
IntegerLiteral::Create(C, llvm::APInt(C.getTypeSize(C.IntTy), (uint64_t) 1),
C.IntTy, SourceLocation());
ICE = ImplicitCastExpr::Create(C, PredicateTy, CK_IntegralCast, IL, 0,
VK_RValue);
DR = DeclRefExpr::CreateEmpty(C, false, false, false, false);
DR->setDecl(const_cast<ParmVarDecl*>(Predicate));
DR->setType(PredicateQPtrTy);
DR->setValueKind(VK_LValue);
ImplicitCastExpr *LValToRval =
ImplicitCastExpr::Create(C, PredicateQPtrTy, CK_LValueToRValue, DR,
0, VK_RValue);
UnaryOperator *UO = new (C) UnaryOperator(LValToRval, UO_Deref, PredicateTy,
VK_LValue, OK_Ordinary,
SourceLocation());
BinaryOperator *B = new (C) BinaryOperator(UO, ICE, BO_Assign,
PredicateTy, VK_RValue,
OK_Ordinary,
SourceLocation());
// (3) Create the compound statement.
Stmt *Stmts[2];
Stmts[0] = B;
Stmts[1] = CE;
CompoundStmt *CS = new (C) CompoundStmt(C, Stmts, 2, SourceLocation(),
SourceLocation());
// (4) Create the 'if' condition.
DR = DeclRefExpr::CreateEmpty(C, false, false, false, false);
DR->setDecl(const_cast<ParmVarDecl*>(Predicate));
DR->setType(PredicateQPtrTy);
DR->setValueKind(VK_LValue);
LValToRval = ImplicitCastExpr::Create(C, PredicateQPtrTy, CK_LValueToRValue,
DR, 0, VK_RValue);
UO = new (C) UnaryOperator(LValToRval, UO_Deref, PredicateTy,
VK_LValue, OK_Ordinary,
SourceLocation());
LValToRval = ImplicitCastExpr::Create(C, PredicateTy, CK_LValueToRValue,
UO, 0, VK_RValue);
UO = new (C) UnaryOperator(LValToRval, UO_LNot, C.IntTy,
VK_RValue, OK_Ordinary, SourceLocation());
// (5) Create the 'if' statement.
IfStmt *If = new (C) IfStmt(C, SourceLocation(), 0, UO, CS);
return If;
}
/// Create a fake body for dispatch_sync.
static Stmt *create_dispatch_sync(ASTContext &C, const FunctionDecl *D) {
@ -32,16 +139,7 @@ static Stmt *create_dispatch_sync(ASTContext &C, const FunctionDecl *D) {
// Check if the second parameter is a block.
const ParmVarDecl *PV = D->getParamDecl(1);
QualType Ty = PV->getType();
const BlockPointerType *BPT = Ty->getAs<BlockPointerType>();
if (!BPT)
return 0;
// Check if the block pointer type takes no arguments and
// returns void.
const FunctionProtoType *FT =
BPT->getPointeeType()->getAs<FunctionProtoType>();
if (!FT || !FT->getResultType()->isVoidType() ||
FT->getNumArgs() != 0)
if (!isDispatchBlock(Ty))
return 0;
// Everything checks out. Create a fake body that just calls the block.
@ -53,6 +151,7 @@ static Stmt *create_dispatch_sync(ASTContext &C, const FunctionDecl *D) {
//
DeclRefExpr *DR = DeclRefExpr::CreateEmpty(C, false, false, false, false);
DR->setDecl(const_cast<ParmVarDecl*>(PV));
DR->setType(Ty);
DR->setValueKind(VK_LValue);
ImplicitCastExpr *ICE = ImplicitCastExpr::Create(C, Ty, CK_LValueToRValue,
DR, 0, VK_RValue);
@ -80,6 +179,7 @@ Stmt *BodyFarm::getBody(const FunctionDecl *D) {
FunctionFarmer FF =
llvm::StringSwitch<FunctionFarmer>(Name)
.Case("dispatch_sync", create_dispatch_sync)
.Case("dispatch_once", create_dispatch_once)
.Default(NULL);
if (FF) {

Просмотреть файл

@ -181,6 +181,15 @@ void test_dispatch_sync(dispatch_queue_t queue, int *q) {
});
}
// Test inlining if dispatch_once.
void test_inline_dispatch_once() {
static dispatch_once_t pred;
int *p = 0;
dispatch_once(&pred, ^(void) {
*p = 1; // expected-warning {{null}}
});
}
// CHECK: <key>diagnostics</key>
// CHECK-NEXT: <array>
// CHECK-NEXT: <dict>
@ -1585,4 +1594,307 @@ void test_dispatch_sync(dispatch_queue_t queue, int *q) {
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>path</key>
// CHECK-NEXT: <array>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>kind</key><string>control</string>
// CHECK-NEXT: <key>edges</key>
// CHECK-NEXT: <array>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>start</key>
// CHECK-NEXT: <array>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>186</integer>
// CHECK-NEXT: <key>col</key><integer>3</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>186</integer>
// CHECK-NEXT: <key>col</key><integer>8</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: </array>
// CHECK-NEXT: <key>end</key>
// CHECK-NEXT: <array>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>187</integer>
// CHECK-NEXT: <key>col</key><integer>3</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>187</integer>
// CHECK-NEXT: <key>col</key><integer>5</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: </array>
// CHECK-NEXT: </dict>
// CHECK-NEXT: </array>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>kind</key><string>event</string>
// CHECK-NEXT: <key>location</key>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>187</integer>
// CHECK-NEXT: <key>col</key><integer>3</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <key>ranges</key>
// CHECK-NEXT: <array>
// CHECK-NEXT: <array>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>187</integer>
// CHECK-NEXT: <key>col</key><integer>3</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>187</integer>
// CHECK-NEXT: <key>col</key><integer>8</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: </array>
// CHECK-NEXT: </array>
// CHECK-NEXT: <key>depth</key><integer>0</integer>
// CHECK-NEXT: <key>extended_message</key>
// CHECK-NEXT: <string>Variable &apos;p&apos; initialized to a null pointer value</string>
// CHECK-NEXT: <key>message</key>
// CHECK-NEXT: <string>Variable &apos;p&apos; initialized to a null pointer value</string>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>kind</key><string>event</string>
// CHECK-NEXT: <key>location</key>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>188</integer>
// CHECK-NEXT: <key>col</key><integer>3</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <key>ranges</key>
// CHECK-NEXT: <array>
// CHECK-NEXT: <array>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>188</integer>
// CHECK-NEXT: <key>col</key><integer>3</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>190</integer>
// CHECK-NEXT: <key>col</key><integer>4</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: </array>
// CHECK-NEXT: </array>
// CHECK-NEXT: <key>depth</key><integer>0</integer>
// CHECK-NEXT: <key>extended_message</key>
// CHECK-NEXT: <string>Calling &apos;_dispatch_once&apos;</string>
// CHECK-NEXT: <key>message</key>
// CHECK-NEXT: <string>Calling &apos;_dispatch_once&apos;</string>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>kind</key><string>event</string>
// CHECK-NEXT: <key>location</key>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>162</integer>
// CHECK-NEXT: <key>col</key><integer>1</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <key>depth</key><integer>1</integer>
// CHECK-NEXT: <key>extended_message</key>
// CHECK-NEXT: <string>Entered call from &apos;test_inline_dispatch_once&apos;</string>
// CHECK-NEXT: <key>message</key>
// CHECK-NEXT: <string>Entered call from &apos;test_inline_dispatch_once&apos;</string>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>kind</key><string>control</string>
// CHECK-NEXT: <key>edges</key>
// CHECK-NEXT: <array>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>start</key>
// CHECK-NEXT: <array>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>162</integer>
// CHECK-NEXT: <key>col</key><integer>1</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>162</integer>
// CHECK-NEXT: <key>col</key><integer>6</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: </array>
// CHECK-NEXT: <key>end</key>
// CHECK-NEXT: <array>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>164</integer>
// CHECK-NEXT: <key>col</key><integer>3</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>164</integer>
// CHECK-NEXT: <key>col</key><integer>15</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: </array>
// CHECK-NEXT: </dict>
// CHECK-NEXT: </array>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>kind</key><string>event</string>
// CHECK-NEXT: <key>location</key>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>164</integer>
// CHECK-NEXT: <key>col</key><integer>3</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <key>ranges</key>
// CHECK-NEXT: <array>
// CHECK-NEXT: <array>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>164</integer>
// CHECK-NEXT: <key>col</key><integer>3</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>164</integer>
// CHECK-NEXT: <key>col</key><integer>33</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: </array>
// CHECK-NEXT: </array>
// CHECK-NEXT: <key>depth</key><integer>1</integer>
// CHECK-NEXT: <key>extended_message</key>
// CHECK-NEXT: <string>Calling &apos;dispatch_once&apos;</string>
// CHECK-NEXT: <key>message</key>
// CHECK-NEXT: <string>Calling &apos;dispatch_once&apos;</string>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>kind</key><string>event</string>
// CHECK-NEXT: <key>location</key>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>38</integer>
// CHECK-NEXT: <key>col</key><integer>1</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <key>depth</key><integer>2</integer>
// CHECK-NEXT: <key>extended_message</key>
// CHECK-NEXT: <string>Entered call from &apos;_dispatch_once&apos;</string>
// CHECK-NEXT: <key>message</key>
// CHECK-NEXT: <string>Entered call from &apos;_dispatch_once&apos;</string>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>kind</key><string>event</string>
// CHECK-NEXT: <key>location</key>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>164</integer>
// CHECK-NEXT: <key>col</key><integer>3</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <key>ranges</key>
// CHECK-NEXT: <array>
// CHECK-NEXT: <array>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>164</integer>
// CHECK-NEXT: <key>col</key><integer>3</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>164</integer>
// CHECK-NEXT: <key>col</key><integer>33</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: </array>
// CHECK-NEXT: </array>
// CHECK-NEXT: <key>depth</key><integer>2</integer>
// CHECK-NEXT: <key>extended_message</key>
// CHECK-NEXT: <string>Calling anonymous block</string>
// CHECK-NEXT: <key>message</key>
// CHECK-NEXT: <string>Calling anonymous block</string>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>kind</key><string>event</string>
// CHECK-NEXT: <key>location</key>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>188</integer>
// CHECK-NEXT: <key>col</key><integer>24</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <key>depth</key><integer>3</integer>
// CHECK-NEXT: <key>extended_message</key>
// CHECK-NEXT: <string>Entered call from &apos;dispatch_once&apos;</string>
// CHECK-NEXT: <key>message</key>
// CHECK-NEXT: <string>Entered call from &apos;dispatch_once&apos;</string>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>kind</key><string>control</string>
// CHECK-NEXT: <key>edges</key>
// CHECK-NEXT: <array>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>start</key>
// CHECK-NEXT: <array>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>188</integer>
// CHECK-NEXT: <key>col</key><integer>24</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>188</integer>
// CHECK-NEXT: <key>col</key><integer>24</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: </array>
// CHECK-NEXT: <key>end</key>
// CHECK-NEXT: <array>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>189</integer>
// CHECK-NEXT: <key>col</key><integer>4</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>189</integer>
// CHECK-NEXT: <key>col</key><integer>4</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: </array>
// CHECK-NEXT: </dict>
// CHECK-NEXT: </array>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>kind</key><string>event</string>
// CHECK-NEXT: <key>location</key>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>189</integer>
// CHECK-NEXT: <key>col</key><integer>4</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <key>ranges</key>
// CHECK-NEXT: <array>
// CHECK-NEXT: <array>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>189</integer>
// CHECK-NEXT: <key>col</key><integer>5</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>189</integer>
// CHECK-NEXT: <key>col</key><integer>5</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: </array>
// CHECK-NEXT: </array>
// CHECK-NEXT: <key>depth</key><integer>3</integer>
// CHECK-NEXT: <key>extended_message</key>
// CHECK-NEXT: <string>Dereference of null pointer (loaded from variable &apos;p&apos;)</string>
// CHECK-NEXT: <key>message</key>
// CHECK-NEXT: <string>Dereference of null pointer (loaded from variable &apos;p&apos;)</string>
// CHECK-NEXT: </dict>
// CHECK-NEXT: </array>
// CHECK-NEXT: <key>description</key><string>Dereference of null pointer (loaded from variable &apos;p&apos;)</string>
// CHECK-NEXT: <key>category</key><string>Logic error</string>
// CHECK-NEXT: <key>type</key><string>Dereference of null pointer</string>
// CHECK-NEXT: <key>location</key>
// CHECK-NEXT: <dict>
// CHECK-NEXT: <key>line</key><integer>189</integer>
// CHECK-NEXT: <key>col</key><integer>4</integer>
// CHECK-NEXT: <key>file</key><integer>0</integer>
// CHECK-NEXT: </dict>
// CHECK-NEXT: </dict>
// CHECK-NEXT: </array>