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This was originally added in https://reviews.llvm.org/D142268 to have LLDB display variable typenames that benefit from suppressing defaulted template arguments. We currently represent template aliases as `DW_AT_typedef`s instead of `DW_TAG_template_alias`. This means for types like: ``` template <class _Tp> using __remove_cv_t = __remove_cv(_Tp); template <class _Tp> using remove_cv_t = __remove_cv_t<_Tp>; template<typename T> class optional { using value_type = T; remove_cv_t<value_type> __val_; } ``` we would generate DWARF like: ``` 0x0000274f: DW_TAG_typedef DW_AT_type (0x0000000000002758 "__remove_cv_t<value_type>") DW_AT_name ("remove_cv_t<value_type>") ``` This is an actual libc++ type layout introduced in https://github.com/llvm/llvm-project/pull/110355, and uncovered a shortcoming of LLDB's data-formatter infrastructure, where we cache formatters on the contents of `DW_AT_name` (which currently wouldn't be a fully resolved typename for template specializations). To unblock the libc++ change, I think we can revert this without much fallout. Then we have two options for follow-up (or do both): 1. reland this but adjust the LLDB formatter cache so it doesn't cache formatters for template specializations 2. implement support for `DW_TAG_template_alias` in LLDB (and make Clang generate them by default).
49 lines
1.3 KiB
C++
49 lines
1.3 KiB
C++
// RUN: %clang -g -gno-template-alias -std=c++11 -S -emit-llvm %s -o - | FileCheck %s
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template<typename T>
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struct foo {
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};
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template<typename T, typename T2 = int>
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struct baz {
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};
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namespace x {
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// splitting these over multiple lines to make sure the right token is used for
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// the location
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template<typename T>
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using
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# 42
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bar
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= foo<T*>;
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}
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// CHECK: !DIGlobalVariable(name: "bi",{{.*}} type: [[BINT:![0-9]+]]
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x::bar<int> bi;
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// CHECK: !DIGlobalVariable(name: "bf",{{.*}} type: [[BFLOAT:![0-9]+]]
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// CHECK: [[BFLOAT]] = !DIDerivedType(tag: DW_TAG_typedef, name: "bar<float>"
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x::bar<float> bf;
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// CHECK: !DIGlobalVariable(name: "bz",{{.*}} type: [[BBAZ:![0-9]+]]
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// CHECK: [[BBAZ]] = !DIDerivedType(tag: DW_TAG_typedef, name: "bar<baz<int,{{ *}}int> >"
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x::bar<baz<int>> bz;
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using
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// CHECK: !DIGlobalVariable(name: "n",{{.*}} type: [[NARF:![0-9]+]]
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# 142
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narf // CHECK: [[NARF]] = !DIDerivedType(tag: DW_TAG_typedef, name: "narf"
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// CHECK-SAME: line: 142
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= int;
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narf n;
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template <typename T>
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using tv = void;
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// CHECK: !DIDerivedType(tag: DW_TAG_typedef, name: "tv<int>"
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tv<int> *tvp;
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using v = void;
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// CHECK: !DIDerivedType(tag: DW_TAG_typedef, name: "v"
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v *vp;
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// CHECK: [[BINT]] = !DIDerivedType(tag: DW_TAG_typedef, name: "bar<int>"
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// CHECK-SAME: line: 42,
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