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711a644127
With this patch, whenever we emit a `DW_AT_type` for some declaration
and the type is a template class with a `clang::PreferredNameAttr`, we
will emit the typedef that the attribute refers to instead. I.e.,
```
0x123 DW_TAG_variable
DW_AT_name "var"
DW_AT_type (0x123 "basic_string<char>")
0x124 DW_TAG_structure_type
DW_AT_name "basic_string<char>"
```
...becomes
```
0x123 DW_TAG_variable
DW_AT_name "var"
DW_AT_type (0x124 "std::string")
0x124 DW_TAG_structure_type
DW_AT_name "basic_string<char>"
0x125 DW_TAG_typedef
DW_AT_name "std::string"
DW_AT_type (0x124 "basic_string<char>")
```
We do this by returning the preferred name typedef `DIType` when
we create a structure definition. In some cases, e.g., with `-gmodules`,
we don't complete the structure definition immediately but do so later
via `completeClassData`, which overwrites the `TypeCache`. In such cases
we don't actually want to rewrite the cache with the preferred name. We
handle this by returning both the definition and the preferred typedef
from `CreateTypeDefinition` and let the callee decide what to do with
it.
Essentially we set up the types as:
```
TypeCache[Record] => DICompositeType
ReplaceMap[Record] => DIDerivedType(baseType: DICompositeType)
```
For now we keep this behind LLDB tuning.
**Testing**
- Added clang unit-test
- `check-llvm`, `check-clang` pass
- Confirmed that this change correctly repoints
`basic_string` references in some of my test programs.
- Will add follow-up LLDB API tests
Differential Revision: https://reviews.llvm.org/D145803
66 lines
3.5 KiB
C++
66 lines
3.5 KiB
C++
// RUN: %clang_cc1 -triple x86_64-unk-unk -o - -emit-llvm -debug-info-kind=standalone -debugger-tuning=lldb %s | FileCheck %s --check-prefixes=COMMON,LLDB
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// RUN: %clang_cc1 -triple x86_64-unk-unk -o - -emit-llvm -debug-info-kind=standalone -debugger-tuning=gdb %s | FileCheck %s --check-prefixes=COMMON,GDB
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template <typename T>
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struct Foo;
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typedef Foo<int> BarIntBase;
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typedef BarIntBase BarIntTmp;
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typedef BarIntTmp BarInt;
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template <typename T>
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using BarBase = Foo<T>;
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template <typename T>
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using BarTmp = BarBase<T>;
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template <typename T>
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using Bar = BarTmp<T>;
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template <typename T>
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struct [[clang::preferred_name(BarInt),
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clang::preferred_name(Bar<char>)]] Foo{
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};
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int main() {
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Foo<int> varInt;
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// COMMON: !DILocalVariable(name: "varInt", scope: ![[#]], file: ![[#]], line: [[#]], type: ![[BAR_INT_TY:[0-9]+]])
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// LLDB: ![[BAR_INT_TY]] = !DIDerivedType(tag: DW_TAG_typedef, name: "BarInt", file: ![[#]], line: [[#]], baseType: ![[BAR_INT_TMP:[0-9]+]])
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// LLDB: ![[BAR_INT_TMP]] = !DIDerivedType(tag: DW_TAG_typedef, name: "BarIntTmp", file: ![[#]], line: [[#]], baseType: ![[BAR_INT_BASE:[0-9]+]])
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// LLDB: ![[BAR_INT_BASE]] = !DIDerivedType(tag: DW_TAG_typedef, name: "BarIntBase", file: ![[#]], line: [[#]], baseType: ![[FOO_INT:[0-9]+]])
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// LLDB: ![[FOO_INT]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Foo<int>", file: ![[#]], line: [[#]], size: [[#]]
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// GDB: ![[BAR_INT_TY]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Foo<int>", file: ![[#]], line: [[#]], size: [[#]]
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Foo<char> varChar;
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// COMMON: !DILocalVariable(name: "varChar", scope: ![[#]], file: ![[#]], line: [[#]], type: ![[BAR_CHAR_TY:[0-9]+]])
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// LLDB: ![[BAR_CHAR_TY]] = !DIDerivedType(tag: DW_TAG_typedef, name: "Bar<char>", file: ![[#]], line: [[#]], baseType: ![[BAR_CHAR_TMP:[0-9]+]])
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// LLDB: ![[BAR_CHAR_TMP]] = !DIDerivedType(tag: DW_TAG_typedef, name: "BarTmp<char>", file: ![[#]], line: [[#]], baseType: ![[BAR_CHAR_BASE:[0-9]+]])
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// LLDB: ![[BAR_CHAR_BASE]] = !DIDerivedType(tag: DW_TAG_typedef, name: "BarBase<char>", file: ![[#]], line: [[#]], baseType: ![[FOO_CHAR:[0-9]+]])
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// LLDB: ![[FOO_CHAR]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Foo<char>"
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// GDB: ![[BAR_CHAR_TY]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Foo<char>"
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Foo<Foo<int>> varFooInt;
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// COMMON: !DILocalVariable(name: "varFooInt", scope: ![[#]], file: ![[#]], line: [[#]], type: ![[FOO_BAR_INT_TY:[0-9]+]])
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// COMMON: ![[FOO_BAR_INT_TY]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Foo<Foo<int> >"
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// COMMON-SAME: templateParams: ![[PARAM:[0-9]+]]
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// COMMON: ![[PARAM]] = !{![[TEMPL_TYPE_PARAM:[0-9]+]]}
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// GDB: ![[TEMPL_TYPE_PARAM]] = !DITemplateTypeParameter(name: "T", type: ![[BAR_INT_TY]])
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// LLDB: ![[TEMPL_TYPE_PARAM]] = !DITemplateTypeParameter(name: "T", type: ![[BAR_INT_TY]])
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Foo<Foo<char>> varFooChar;
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// COMMON: !DILocalVariable(name: "varFooChar", scope: ![[#]], file: ![[#]], line: [[#]], type: ![[FOO_BAR_CHAR_TY:[0-9]+]])
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// COMMON: ![[FOO_BAR_CHAR_TY]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Foo<Foo<char> >"
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// COMMON-SAME: templateParams: ![[CHAR_PARAM:[0-9]+]]
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// COMMON: ![[CHAR_PARAM]] = !{![[CHAR_TEMPL_TYPE_PARAM:[0-9]+]]}
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// GDB: ![[CHAR_TEMPL_TYPE_PARAM]] = !DITemplateTypeParameter(name: "T", type: ![[BAR_CHAR_TY]])
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// LLDB: ![[CHAR_TEMPL_TYPE_PARAM]] = !DITemplateTypeParameter(name: "T", type: ![[BAR_CHAR_TY]])
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return 0;
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}
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