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llvm-project/clang/test/Analysis/cfg.cpp
Jordan Rose c9176072e6 [analyzer] Add a CFG node for the allocator call in a C++ 'new' expression. 
In an expression like "new (a, b) Foo(x, y)", two things happen:
- Memory is allocated by calling a function named 'operator new'.
- The memory is initialized using the constructor for 'Foo'.

Currently the analyzer only models the second event, though it has special
cases for both the default and placement forms of operator new. This patch
is the first step towards properly modeling both events: it changes the CFG
so that the above expression now generates the following elements.

1. a
2. b
3. (CFGNewAllocator)
4. x
5. y
6. Foo::Foo

The analyzer currently ignores the CFGNewAllocator element, but the next
step is to treat that as a call like any other.

The CFGNewAllocator element is not added to the CFG for analysis-based
warnings, since none of them take advantage of it yet.

llvm-svn: 199123
2014-01-13 17:59:19 +00:00

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// RUN: %clang_cc1 -analyze -analyzer-checker=debug.DumpCFG -triple x86_64-apple-darwin12 -std=c++11 %s > %t 2>&1
// RUN: FileCheck --input-file=%t %s
// CHECK: ENTRY
// CHECK-NEXT: Succs (1): B1
// CHECK: [B1]
// CHECK: Succs (21): B2 B3 B4 B5 B6 B7 B8 B9
// CHECK: B10 B11 B12 B13 B14 B15 B16 B17 B18 B19
// CHECK: B20 B21 B0
// CHECK: [B0 (EXIT)]
// CHECK-NEXT: Preds (21): B2 B3 B4 B5 B6 B7 B8 B9
// CHECK-NEXT: B10 B11 B12 B13 B14 B15 B16 B17 B18 B19
// CHECK-NEXT: B20 B21 B1
void checkWrap(int i) {
switch(i) {
case 0: break;
case 1: break;
case 2: break;
case 3: break;
case 4: break;
case 5: break;
case 6: break;
case 7: break;
case 8: break;
case 9: break;
case 10: break;
case 11: break;
case 12: break;
case 13: break;
case 14: break;
case 15: break;
case 16: break;
case 17: break;
case 18: break;
case 19: break;
}
}
// CHECK: ENTRY
// CHECK-NEXT: Succs (1): B1
// CHECK: [B1]
// CHECK-NEXT: 1: int i;
// CHECK-NEXT: 2: int j;
// CHECK-NEXT: 3: 1
// CHECK-NEXT: 4: int k = 1;
// CHECK-NEXT: 5: int l;
// CHECK-NEXT: 6: 2
// CHECK-NEXT: 7: int m = 2;
// CHECK-NEXT: CXXConstructExpr
// CHECK-NEXT: 9: struct standalone myStandalone;
// CHECK-NEXT: CXXConstructExpr
// CHECK-NEXT: 11: struct <anonymous struct at {{.*}}> myAnon;
// CHECK-NEXT: CXXConstructExpr
// CHECK-NEXT: 13: struct named myNamed;
// CHECK-NEXT: Preds (1): B2
// CHECK-NEXT: Succs (1): B0
void checkDeclStmts() {
int i, j;
int k = 1, l, m = 2;
struct standalone { int x, y; };
struct standalone myStandalone;
struct { int x, y; } myAnon;
struct named { int x, y; } myNamed;
static_assert(1, "abc");
}
// CHECK: ENTRY
// CHECK-NEXT: Succs (1): B1
// CHECK: [B1]
// CHECK-NEXT: 1: e
// CHECK-NEXT: 2: [B1.1] (ImplicitCastExpr, LValueToRValue, enum EmptyE)
// CHECK-NEXT: 3: [B1.2] (ImplicitCastExpr, IntegralCast, int)
// CHECK-NEXT: T: switch [B1.3]
// CHECK-NEXT: Preds (1): B2
// CHECK-NEXT: Succs (1): B0
// CHECK: [B0 (EXIT)]
// CHECK-NEXT: Preds (1): B1
enum EmptyE {};
void F(EmptyE e) {
switch (e) {}
}
// CHECK: ENTRY
// CHECK-NEXT: Succs (1): B1
// CHECK: [B1]
// CHECK-NEXT: 1: __builtin_object_size
// CHECK-NEXT: 2: [B1.1] (ImplicitCastExpr, BuiltinFnToFnPtr, unsigned long (*)(const void *, int))
// CHECK-NEXT: 3: [B1.2](dummy(), 0)
// CHECK-NEXT: 4: (void)[B1.3] (CStyleCastExpr, ToVoid, void)
// CHECK-NEXT: Preds (1): B2
// CHECK-NEXT: Succs (1): B0
// CHECK: [B0 (EXIT)]
// CHECK-NEXT: Preds (1): B1
void testBuiltinSize() {
extern int *dummy();
(void)__builtin_object_size(dummy(), 0);
}
class A {
public:
A() {}
~A() {}
};
// CHECK: [B2 (ENTRY)]
// CHECK-NEXT: Succs (1): B1
// CHECK: [B1]
// CHECK-NEXT: 1: CFGNewAllocator(A *)
// CHECK-NEXT: 2: (CXXConstructExpr, class A)
// CHECK-NEXT: 3: new A([B1.2])
// CHECK-NEXT: 4: A *a = new A();
// CHECK-NEXT: 5: a
// CHECK-NEXT: 6: [B1.5] (ImplicitCastExpr, LValueToRValue, class A *)
// CHECK-NEXT: 7: [B1.6]->~A() (Implicit destructor)
// CHECK-NEXT: 8: delete [B1.6]
// CHECK-NEXT: Preds (1): B2
// CHECK-NEXT: Succs (1): B0
// CHECK: [B0 (EXIT)]
// CHECK-NEXT: Preds (1): B1
void test_deletedtor() {
A *a = new A();
delete a;
}
// CHECK: [B2 (ENTRY)]
// CHECK-NEXT: Succs (1): B1
// CHECK: [B1]
// CHECK-NEXT: 1: 5
// CHECK-NEXT: 2: CFGNewAllocator(A *)
// CHECK-NEXT: 3: (CXXConstructExpr, class A)
// CHECK-NEXT: 4: new A {{\[\[}}B1.1]]
// CHECK-NEXT: 5: A *a = new A [5];
// CHECK-NEXT: 6: a
// CHECK-NEXT: 7: [B1.6] (ImplicitCastExpr, LValueToRValue, class A *)
// CHECK-NEXT: 8: [B1.7]->~A() (Implicit destructor)
// CHECK-NEXT: 9: delete [] [B1.7]
// CHECK-NEXT: Preds (1): B2
// CHECK-NEXT: Succs (1): B0
// CHECK: [B0 (EXIT)]
// CHECK-NEXT: Preds (1): B1
void test_deleteArraydtor() {
A *a = new A[5];
delete[] a;
}
namespace NoReturnSingleSuccessor {
struct A {
A();
~A();
};
struct B : public A {
B();
~B() __attribute__((noreturn));
};
// CHECK: ENTRY
// CHECK: 1: 1
// CHECK-NEXT: 2: return
// CHECK-NEXT: ~B() (Implicit destructor)
// CHECK-NEXT: Preds (1)
// CHECK-NEXT: Succs (1): B0
int test1(int *x) {
B b;
if (x)
return 1;
}
// CHECK: ENTRY
// CHECK: 1: 1
// CHECK-NEXT: 2: return
// CHECK-NEXT: destructor
// CHECK-NEXT: Preds (1)
// CHECK-NEXT: Succs (1): B0
int test2(int *x) {
const A& a = B();
if (x)
return 1;
}
}
// Test CFG support for "extending" an enum.
// CHECK: [B7 (ENTRY)]
// CHECK-NEXT: Succs (1): B2
// CHECK: [B1]
// CHECK-NEXT: 1: x
// CHECK-NEXT: 2: [B1.1] (ImplicitCastExpr, LValueToRValue, int)
// CHECK-NEXT: 3: return [B1.2];
// CHECK-NEXT: Preds (4): B3 B4 B5 B6
// CHECK-NEXT: Succs (1): B0
// CHECK: [B2]
// CHECK-NEXT: 1: 0
// CHECK-NEXT: 2: int x = 0;
// CHECK-NEXT: 3: value
// CHECK-NEXT: 4: [B2.3] (ImplicitCastExpr, LValueToRValue, enum MyEnum)
// CHECK-NEXT: 5: [B2.4] (ImplicitCastExpr, IntegralCast, int)
// CHECK-NEXT: T: switch [B2.5]
// CHECK-NEXT: Preds (1): B7
// CHECK-NEXT: Succs (5): B3 B4 B5 B6 NULL
// CHECK: [B3]
// CHECK-NEXT: case D:
// CHECK-NEXT: 1: 4
// CHECK-NEXT: 2: x
// CHECK-NEXT: 3: [B3.2] = [B3.1]
// CHECK-NEXT: T: break;
// CHECK-NEXT: Preds (1): B2
// CHECK-NEXT: Succs (1): B1
// CHECK: [B4]
// CHECK-NEXT: case C:
// CHECK-NEXT: 1: 3
// CHECK-NEXT: 2: x
// CHECK-NEXT: 3: [B4.2] = [B4.1]
// CHECK-NEXT: T: break;
// CHECK-NEXT: Preds (1): B2
// CHECK-NEXT: Succs (1): B1
// CHECK: [B5]
// CHECK-NEXT: case B:
// CHECK-NEXT: 1: 2
// CHECK-NEXT: 2: x
// CHECK-NEXT: 3: [B5.2] = [B5.1]
// CHECK-NEXT: T: break;
// CHECK-NEXT: Preds (1): B2
// CHECK-NEXT: Succs (1): B1
// CHECK: [B6]
// CHECK-NEXT: case A:
// CHECK-NEXT: 1: 1
// CHECK-NEXT: 2: x
// CHECK-NEXT: 3: [B6.2] = [B6.1]
// CHECK-NEXT: T: break;
// CHECK-NEXT: Preds (1): B2
// CHECK-NEXT: Succs (1): B1
// CHECK: [B0 (EXIT)]
// CHECK-NEXT: Preds (1): B1
enum MyEnum { A, B, C };
static const enum MyEnum D = (enum MyEnum) 32;
int test_enum_with_extension(enum MyEnum value) {
int x = 0;
switch (value) {
case A: x = 1; break;
case B: x = 2; break;
case C: x = 3; break;
case D: x = 4; break;
}
return x;
}
// CHECK: [B7 (ENTRY)]
// CHECK-NEXT: Succs (1): B2
// CHECK: [B1]
// CHECK-NEXT: 1: x
// CHECK-NEXT: 2: [B1.1] (ImplicitCastExpr, LValueToRValue, int)
// CHECK-NEXT: 3: return [B1.2];
// CHECK-NEXT: Preds (4): B3 B4 B5 B6
// CHECK-NEXT: Succs (1): B0
// CHECK: [B2]
// CHECK-NEXT: 1: 0
// CHECK-NEXT: 2: int x = 0;
// CHECK-NEXT: 3: value
// CHECK-NEXT: 4: [B2.3] (ImplicitCastExpr, LValueToRValue, enum MyEnum)
// CHECK-NEXT: 5: [B2.4] (ImplicitCastExpr, IntegralCast, int)
// CHECK-NEXT: T: switch [B2.5]
// CHECK-NEXT: Preds (1): B7
// CHECK-NEXT: Succs (4): B4 B5 B6 NULL
// CHECK: [B3]
// CHECK-NEXT: default:
// CHECK-NEXT: 1: 4
// CHECK-NEXT: 2: x
// CHECK-NEXT: 3: [B3.2] = [B3.1]
// CHECK-NEXT: T: break;
// CHECK-NEXT: Succs (1): B1
// CHECK: [B4]
// CHECK-NEXT: case C:
// CHECK-NEXT: 1: 3
// CHECK-NEXT: 2: x
// CHECK-NEXT: 3: [B4.2] = [B4.1]
// CHECK-NEXT: T: break;
// CHECK-NEXT: Preds (1): B2
// CHECK-NEXT: Succs (1): B1
// CHECK: [B5]
// CHECK-NEXT: case B:
// CHECK-NEXT: 1: 2
// CHECK-NEXT: 2: x
// CHECK-NEXT: 3: [B5.2] = [B5.1]
// CHECK-NEXT: T: break;
// CHECK-NEXT: Preds (1): B2
// CHECK-NEXT: Succs (1): B1
// CHECK: [B6]
// CHECK-NEXT: case A:
// CHECK-NEXT: 1: 1
// CHECK-NEXT: 2: x
// CHECK-NEXT: 3: [B6.2] = [B6.1]
// CHECK-NEXT: T: break;
// CHECK-NEXT: Preds (1): B2
// CHECK-NEXT: Succs (1): B1
// CHECK: [B0 (EXIT)]
// CHECK-NEXT: Preds (1): B1
int test_enum_with_extension_default(enum MyEnum value) {
int x = 0;
switch (value) {
case A: x = 1; break;
case B: x = 2; break;
case C: x = 3; break;
default: x = 4; break;
}
return x;
}
// CHECK: [B1 (ENTRY)]
// CHECK-NEXT: Succs (1): B0
// CHECK: [B0 (EXIT)]
// CHECK-NEXT: Preds (1): B1
// CHECK: [B1 (ENTRY)]
// CHECK-NEXT: Succs (1): B0
// CHECK: [B0 (EXIT)]
// CHECK-NEXT: Preds (1): B1
// CHECK: [B2 (ENTRY)]
// CHECK-NEXT: Succs (1): B1
// CHECK: [B1]
// CHECK-NEXT: 1: int buffer[16];
// CHECK-NEXT: 2: buffer
// CHECK-NEXT: 3: [B1.2] (ImplicitCastExpr, ArrayToPointerDecay, int *)
// CHECK-NEXT: 4: [B1.3] (ImplicitCastExpr, BitCast, void *)
// CHECK-NEXT: 5: CFGNewAllocator(MyClass *)
// CHECK-NEXT: 6: (CXXConstructExpr, class MyClass)
// CHECK-NEXT: 7: new ([B1.4]) MyClass([B1.6])
// CHECK-NEXT: 8: MyClass *obj = new (buffer) MyClass();
// CHECK-NEXT: Preds (1): B2
// CHECK-NEXT: Succs (1): B0
// CHECK: [B0 (EXIT)]
// CHECK-NEXT: Preds (1): B1
extern void* operator new (unsigned long sz, void* v);
extern void* operator new[] (unsigned long sz, void* ptr);
class MyClass {
public:
MyClass() {}
~MyClass() {}
};
void test_placement_new() {
int buffer[16];
MyClass* obj = new (buffer) MyClass();
}
// CHECK: [B2 (ENTRY)]
// CHECK-NEXT: Succs (1): B1
// CHECK: [B1]
// CHECK-NEXT: 1: int buffer[16];
// CHECK-NEXT: 2: buffer
// CHECK-NEXT: 3: [B1.2] (ImplicitCastExpr, ArrayToPointerDecay, int *)
// CHECK-NEXT: 4: [B1.3] (ImplicitCastExpr, BitCast, void *)
// CHECK-NEXT: 5: 5
// CHECK-NEXT: 6: CFGNewAllocator(MyClass *)
// CHECK-NEXT: 7: (CXXConstructExpr, class MyClass)
// CHECK-NEXT: 8: new ([B1.4]) MyClass {{\[\[}}B1.5]]
// CHECK-NEXT: 9: MyClass *obj = new (buffer) MyClass [5];
// CHECK-NEXT: Preds (1): B2
// CHECK-NEXT: Succs (1): B0
// CHECK: [B0 (EXIT)]
// CHECK-NEXT: Preds (1): B1
void test_placement_new_array() {
int buffer[16];
MyClass* obj = new (buffer) MyClass[5];
}
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