c83ed8248e
We now generate temporary arrays to back std::initializer_list objects initialized with braces. The initializer_list is then made to point at the array. We support both ptr+size and start+end forms, although the latter is untested. Array lifetime is correct for temporary std::initializer_lists (e.g. call arguments) and local variables. It is untested for new expressions and member initializers. Things left to do: Massively increase the amount of testing. I need to write tests for start+end init lists, temporary objects created as a side effect of initializing init list objects, new expressions, member initialization, creation of temporary objects (e.g. std::vector) for initializer lists, and probably more. Get lifetime "right" for member initializers and new expressions. Not that either are very useful. Implement list-initialization of array new expressions. llvm-svn: 150803
81 lines
2.0 KiB
C++
81 lines
2.0 KiB
C++
// RUN: %clang_cc1 -std=c++11 -S -emit-llvm -o - %s | FileCheck %s
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namespace std {
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typedef decltype(sizeof(int)) size_t;
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// libc++'s implementation
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template <class _E>
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class initializer_list
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{
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const _E* __begin_;
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size_t __size_;
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initializer_list(const _E* __b, size_t __s)
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: __begin_(__b),
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__size_(__s)
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{}
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public:
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typedef _E value_type;
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typedef const _E& reference;
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typedef const _E& const_reference;
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typedef size_t size_type;
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typedef const _E* iterator;
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typedef const _E* const_iterator;
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initializer_list() : __begin_(nullptr), __size_(0) {}
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size_t size() const {return __size_;}
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const _E* begin() const {return __begin_;}
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const _E* end() const {return __begin_ + __size_;}
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};
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}
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void fn1(int i) {
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// CHECK: define void @_Z3fn1i
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// temporary array
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// CHECK: [[array:%[^ ]+]] = alloca [3 x i32]
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// CHECK: getelementptr inbounds [3 x i32]* [[array]], i{{32|64}} 0
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// CHECK-NEXT: store i32 1, i32*
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// CHECK-NEXT: getelementptr
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// CHECK-NEXT: store
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// CHECK-NEXT: getelementptr
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// CHECK-NEXT: load
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// CHECK-NEXT: store
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// init the list
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// CHECK-NEXT: getelementptr
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// CHECK-NEXT: getelementptr inbounds [3 x i32]*
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// CHECK-NEXT: store i32*
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// CHECK-NEXT: getelementptr
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// CHECK-NEXT: store i{{32|64}} 3
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std::initializer_list<int> intlist{1, 2, i};
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}
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struct destroyme1 {
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~destroyme1();
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};
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struct destroyme2 {
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~destroyme2();
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};
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void fn2() {
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// CHECK: define void @_Z3fn2v
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void target(std::initializer_list<destroyme1>);
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// objects should be destroyed before dm2, after call returns
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target({ destroyme1(), destroyme1() });
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// CHECK: call void @_ZN10destroyme1D1Ev
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destroyme2 dm2;
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// CHECK: call void @_ZN10destroyme2D1Ev
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}
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void fn3() {
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// CHECK: define void @_Z3fn3v
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// objects should be destroyed after dm2
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auto list = { destroyme1(), destroyme1() };
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destroyme2 dm2;
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// CHECK: call void @_ZN10destroyme2D1Ev
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// CHECK: call void @_ZN10destroyme1D1Ev
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}
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