9648288c38
the body of a function for the purposes of computing its storage duration and deciding whether its initializer must be constant. There are a number of problems in our current treatment of compound literals. C specifies that a compound literal yields an l-value referring to an object with either static or automatic storage duration, depending on where it was written; in the latter case, the literal object has a lifetime tied to the enclosing scope (much like an ObjC block), not the enclosing full-expression. To get these semantics fully correct in our current design, we would need to collect compound literals on the ExprWithCleanups, just like we do with ObjC blocks; we would probably also want to identify literals like we do with materialized temporaries. But it gets stranger; GCC adds compound literals to C++ as an extension, but makes them r-values, which are generally assumed to have temporary storage duration. Ignoring destructor ordering, the difference only matters if the object's address escapes the full-expression, which for an r-value can only happen with reference binding (which extends temporaries) or array-to-pointer decay (which does not). GCC then attempts to lock down on array-to-pointer decay in ad hoc ways. Arguably a far superior language solution for C++ (and perhaps even array r-values in C, which can occur in other ways) would be to propagate lifetime extension through array-to-pointer decay, so that initializing a pointer object to a decayed r-value array extends the lifetime of the complete object containing the array. But this would be a major change in semantics which arguably ought to be blessed by the committee(s). Anyway, I'm not fixing any of that in this patch; I did try, but it got out of hand. Fixes rdar://28949016. llvm-svn: 285643
99 lines
3.4 KiB
C++
99 lines
3.4 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -std=c++03 -verify -ast-dump %s > %t-03
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// RUN: FileCheck --input-file=%t-03 %s
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// RUN: %clang_cc1 -fsyntax-only -std=c++11 -verify -ast-dump %s > %t-11
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// RUN: FileCheck --input-file=%t-11 %s
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// RUN: FileCheck --input-file=%t-11 %s --check-prefix=CHECK-CXX11
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// http://llvm.org/PR7905
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namespace PR7905 {
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struct S; // expected-note {{forward declaration}}
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void foo1() {
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(void)(S[]) {{3}}; // expected-error {{array has incomplete element type}}
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}
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template <typename T> struct M { T m; };
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void foo2() {
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(void)(M<short> []) {{3}};
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}
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}
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// Check compound literals mixed with C++11 list-initialization.
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namespace brace_initializers {
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struct POD {
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int x, y;
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};
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struct HasCtor {
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HasCtor(int x, int y);
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};
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struct HasDtor {
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int x, y;
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~HasDtor();
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};
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struct HasCtorDtor {
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HasCtorDtor(int x, int y);
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~HasCtorDtor();
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};
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void test() {
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(void)(POD){1, 2};
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// CHECK-NOT: CXXBindTemporaryExpr {{.*}} 'struct brace_initializers::POD'
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// CHECK: CompoundLiteralExpr {{.*}} 'struct brace_initializers::POD'
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// CHECK-NEXT: InitListExpr {{.*}} 'struct brace_initializers::POD'
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// CHECK-NEXT: IntegerLiteral {{.*}} 1{{$}}
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// CHECK-NEXT: IntegerLiteral {{.*}} 2{{$}}
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(void)(HasDtor){1, 2};
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// CHECK: CXXBindTemporaryExpr {{.*}} 'struct brace_initializers::HasDtor'
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// CHECK-NEXT: CompoundLiteralExpr {{.*}} 'struct brace_initializers::HasDtor'
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// CHECK-NEXT: InitListExpr {{.*}} 'struct brace_initializers::HasDtor'
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// CHECK-NEXT: IntegerLiteral {{.*}} 1{{$}}
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// CHECK-NEXT: IntegerLiteral {{.*}} 2{{$}}
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#if __cplusplus >= 201103L
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(void)(HasCtor){1, 2};
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// CHECK-CXX11-NOT: CXXBindTemporaryExpr {{.*}} 'struct brace_initializers::HasCtor'
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// CHECK-CXX11: CompoundLiteralExpr {{.*}} 'struct brace_initializers::HasCtor'
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// CHECK-CXX11-NEXT: CXXTemporaryObjectExpr {{.*}} 'struct brace_initializers::HasCtor'
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// CHECK-CXX11-NEXT: IntegerLiteral {{.*}} 1{{$}}
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// CHECK-CXX11-NEXT: IntegerLiteral {{.*}} 2{{$}}
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(void)(HasCtorDtor){1, 2};
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// CHECK-CXX11: CXXBindTemporaryExpr {{.*}} 'struct brace_initializers::HasCtorDtor'
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// CHECK-CXX11-NEXT: CompoundLiteralExpr {{.*}} 'struct brace_initializers::HasCtorDtor'
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// CHECK-CXX11-NEXT: CXXTemporaryObjectExpr {{.*}} 'struct brace_initializers::HasCtorDtor'
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// CHECK-CXX11-NEXT: IntegerLiteral {{.*}} 1{{$}}
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// CHECK-CXX11-NEXT: IntegerLiteral {{.*}} 2{{$}}
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#endif
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}
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struct PrivateDtor {
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int x, y;
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private:
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~PrivateDtor(); // expected-note {{declared private here}}
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};
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void testPrivateDtor() {
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(void)(PrivateDtor){1, 2}; // expected-error {{temporary of type 'brace_initializers::PrivateDtor' has private destructor}}
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}
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}
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// This doesn't necessarily need to be an error, but CodeGen can't handle it
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// at the moment.
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int PR17415 = (int){PR17415}; // expected-error {{initializer element is not a compile-time constant}}
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// Make sure we accept this. (Not sure if we actually should... but we do
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// at the moment.)
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template<unsigned> struct Value { };
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template<typename T>
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int &check_narrowed(Value<sizeof((T){1.1})>);
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#if __cplusplus >= 201103L
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// Compound literals in global lambdas have automatic storage duration
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// and are not subject to the constant-initialization rules.
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int computed_with_lambda = [] {
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int x = 5;
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int result = ((int[]) { x, x + 2, x + 4, x + 6 })[0];
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return result;
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}();
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#endif
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