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clang-p2996/clang/test/CodeGenCXX/debug-info-template.cpp
David Blaikie 8bf1244538 DebugInfo: workaround for context-sensitive use of non-type-template-parameter integer suffixes 
There's a nuanced check about when to use suffixes on these integer
non-type-template-parameters, but when rebuilding names for
-gsimple-template-names there isn't enough data in the DWARF to
determine when to use suffixes or not. So turn on suffixes always to
make it easy to match up names in llvm-dwarfdump --verify.

I /think/ if we correctly modelled auto non-type-template parameters
maybe we could put suffixes only on those. But there's also some logic
in Clang that puts the suffixes on overloaded functions - at least
that's what the parameter says (see D77598 and printTemplateArguments
"TemplOverloaded" parameter) - but I think maybe it's for anything that
/can/ be overloaded, not necessarily only the things that are overloaded
(the argument value is hardcoded at the various callsites, doesn't seem
to depend on overload resolution/searching for overloaded functions). So
maybe with "auto" modeled more accurately, and differentiating between
function templates (always using type suffixes there) and class/variable
templates (only using the suffix for "auto" types) we could correctly
use integer type suffixes only in the minimal set of cases.

But that seems all too much fuss, so let's just put integer type
suffixes everywhere always in the debug info of integer non-type
template parameters in template names.

(more context:
* https://reviews.llvm.org/D77598#inline-1057607
* https://groups.google.com/g/llvm-dev/c/ekLMllbLIZg/m/-dhJ0hO1AAAJ )

Differential Revision: https://reviews.llvm.org/D111477
2021-11-01 17:08:26 -07:00

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// RUN: %clang -S -emit-llvm -target x86_64-unknown_unknown -g %s -o - -std=c++20 | FileCheck %s
// CHECK: @tci = dso_local global %"struct.TC<unsigned int, 2, &glb, &foo::e, &foo::f, &foo::g, 1, 2, 3>::nested" zeroinitializer, align 1, !dbg [[TCI:![0-9]+]]
// CHECK: @tcn = dso_local global %struct.TC zeroinitializer, align 1, !dbg [[TCN:![0-9]+]]
// CHECK: @nn = dso_local global %struct.NN zeroinitializer, align 1, !dbg [[NN:![0-9]+]]
// CHECK: !DICompileUnit(
struct foo {
char pad[8]; // make the member pointer to 'e' a bit more interesting (nonzero)
int e;
void f();
static void g();
};
typedef int foo::*foo_mem;
template<typename T, T, const int *x, foo_mem a, void (foo::*b)(), void (*f)(), int ...Is>
struct TC {
struct nested {
};
};
int glb;
void func();
// CHECK: [[TCI]] = !DIGlobalVariableExpression(var: [[TCIV:.*]], expr: !DIExpression())
// CHECK: [[TCIV]] = distinct !DIGlobalVariable(name: "tci",
// CHECK-SAME: type: ![[TCNESTED:[0-9]+]]
// CHECK: ![[TCNESTED]] ={{.*}}!DICompositeType(tag: DW_TAG_structure_type, name: "nested",
// CHECK-SAME: scope: ![[TC:[0-9]+]],
// CHECK: ![[TC]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "TC<unsigned int, 2U, &glb, &foo::e, &foo::f, &foo::g, 1, 2, 3>"
// CHECK-SAME: templateParams: [[TCARGS:![0-9]*]]
TC
// CHECK: [[EMPTY:![0-9]*]] = !{}
// CHECK: [[TCARGS]] = !{[[TCARG1:![0-9]*]], [[TCARG2:![0-9]*]], [[TCARG3:![0-9]*]], [[TCARG4:![0-9]*]], [[TCARG5:![0-9]*]], [[TCARG6:![0-9]*]], [[TCARG7:![0-9]*]]}
// CHECK: [[TCARG1]] = !DITemplateTypeParameter(name: "T", type: [[UINT:![0-9]*]])
// CHECK: [[UINT:![0-9]*]] = !DIBasicType(name: "unsigned int"
< unsigned,
// CHECK: [[TCARG2]] = !DITemplateValueParameter(type: [[UINT]], value: i32 2)
2,
// CHECK: [[TCARG3]] = !DITemplateValueParameter(name: "x", type: [[CINTPTR:![0-9]*]], value: i32* @glb)
// CHECK: [[CINTPTR]] = !DIDerivedType(tag: DW_TAG_pointer_type, {{.*}}baseType: [[CINT:![0-9]+]]
// CHECK: [[CINT]] = !DIDerivedType(tag: DW_TAG_const_type, {{.*}}baseType: [[INT:![0-9]+]]
// CHECK: [[INT]] = !DIBasicType(name: "int"
&glb,
// CHECK: [[TCARG4]] = !DITemplateValueParameter(name: "a", type: [[MEMINTPTR:![0-9]*]], value: i64 8)
// CHECK: [[MEMINTPTR]] = !DIDerivedType(tag: DW_TAG_ptr_to_member_type, {{.*}}baseType: [[INT]], {{.*}}extraData: ![[FOO:[0-9]+]])
//
// We could just emit a declaration of 'foo' here, rather than the entire
// definition (same goes for any time we emit a member (function or data)
// pointer type)
// CHECK: [[FOO]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "foo", {{.*}}identifier: "_ZTS3foo")
// CHECK: !DISubprogram(name: "f", linkageName: "_ZN3foo1fEv", {{.*}}type: [[FTYPE:![0-9]*]]
//
// Currently Clang emits the pointer-to-member-function value, but LLVM doesn't
// use it (GCC doesn't emit a value for pointers to member functions either - so
// it's not clear what, if any, format would be acceptable to GDB)
//
// CHECK: [[FTYPE:![0-9]*]] = !DISubroutineType(types: [[FARGS:![0-9]*]])
// CHECK: [[FARGS]] = !{null, [[FARG1:![0-9]*]]}
// CHECK: [[FARG1]] = !DIDerivedType(tag: DW_TAG_pointer_type,
// CHECK-SAME: baseType: ![[FOO]]
// CHECK-NOT: line:
// CHECK-SAME: size: 64
// CHECK-NOT: offset: 0
// CHECK-SAME: DIFlagArtificial
// CHECK: [[FUNTYPE:![0-9]*]] = !DISubroutineType(types: [[FUNARGS:![0-9]*]])
// CHECK: [[FUNARGS]] = !{null}
&foo::e,
// CHECK: [[TCARG5]] = !DITemplateValueParameter(name: "b", type: [[MEMFUNPTR:![0-9]*]], value: { i64, i64 } { i64 ptrtoint (void (%struct.foo*)* @_ZN3foo1fEv to i64), i64 0 })
// CHECK: [[MEMFUNPTR]] = !DIDerivedType(tag: DW_TAG_ptr_to_member_type, {{.*}}baseType: [[FTYPE]], {{.*}}extraData: ![[FOO]])
&foo::f,
// CHECK: [[TCARG6]] = !DITemplateValueParameter(name: "f", type: [[FUNPTR:![0-9]*]], value: void ()* @_ZN3foo1gEv)
// CHECK: [[FUNPTR]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: [[FUNTYPE]]
&foo::g,
// CHECK: [[TCARG7]] = !DITemplateValueParameter(tag: DW_TAG_GNU_template_parameter_pack, name: "Is", value: [[TCARG7_VALS:![0-9]*]])
// CHECK: [[TCARG7_VALS]] = !{[[TCARG7_1:![0-9]*]], [[TCARG7_2:![0-9]*]], [[TCARG7_3:![0-9]*]]}
// CHECK: [[TCARG7_1]] = !DITemplateValueParameter(type: [[INT]], value: i32 1)
1,
// CHECK: [[TCARG7_2]] = !DITemplateValueParameter(type: [[INT]], value: i32 2)
2,
// CHECK: [[TCARG7_3]] = !DITemplateValueParameter(type: [[INT]], value: i32 3)
3>::nested tci;
// CHECK: [[TCN]] = !DIGlobalVariableExpression(var: [[TCNV:.*]], expr: !DIExpression())
// CHECK: [[TCNV]] = distinct !DIGlobalVariable(name: "tcn"
// CHECK-SAME: type: ![[TCNT:[0-9]+]]
TC
// CHECK: ![[TCNT]] ={{.*}}!DICompositeType(tag: DW_TAG_structure_type, name: "TC<int, -3, nullptr, nullptr, nullptr, nullptr>"
// CHECK-SAME: templateParams: [[TCNARGS:![0-9]*]]
// CHECK: [[TCNARGS]] = !{[[TCNARG1:![0-9]*]], [[TCNARG2:![0-9]*]], [[TCNARG3:![0-9]*]], [[TCNARG4:![0-9]*]], [[TCNARG5:![0-9]*]], [[TCNARG6:![0-9]*]], [[TCNARG7:![0-9]*]]}
// CHECK: [[TCNARG1]] = !DITemplateTypeParameter(name: "T", type: [[INT]])
<int,
// CHECK: [[TCNARG2]] = !DITemplateValueParameter(type: [[INT]], value: i32 -3)
-3,
// CHECK: [[TCNARG3]] = !DITemplateValueParameter(name: "x", type: [[CINTPTR]], value: i8 0)
nullptr,
// The interesting null pointer: -1 for member data pointers (since they are
// just an offset in an object, they can be zero and non-null for the first
// member)
// CHECK: [[TCNARG4]] = !DITemplateValueParameter(name: "a", type: [[MEMINTPTR]], value: i64 -1)
nullptr,
//
// In some future iteration we could possibly emit the value of a null member
// function pointer as '{ i64, i64 } zeroinitializer' as it may be handled
// naturally from the LLVM CodeGen side once we decide how to handle non-null
// member function pointers. For now, it's simpler just to emit the 'i8 0'.
//
// CHECK: [[TCNARG5]] = !DITemplateValueParameter(name: "b", type: [[MEMFUNPTR]], value: i8 0)
nullptr,
// CHECK: [[TCNARG6]] = !DITemplateValueParameter(name: "f", type: [[FUNPTR]], value: i8 0)
nullptr
// CHECK: [[TCNARG7]] = !DITemplateValueParameter(tag: DW_TAG_GNU_template_parameter_pack, name: "Is", value: [[EMPTY]])
> tcn;
template<typename>
struct tmpl_impl {
};
template <template <typename> class tmpl, int &lvr>
struct NN {
};
// CHECK: [[NN]] = !DIGlobalVariableExpression(var: [[NNV:.*]], expr: !DIExpression())
// CHECK: [[NNV]] = distinct !DIGlobalVariable(name: "nn"
// CHECK-SAME: type: ![[NNT:[0-9]+]]
// CHECK: ![[NNT]] ={{.*}}!DICompositeType(tag: DW_TAG_structure_type, name: "NN<tmpl_impl, glb>",
// CHECK-SAME: templateParams: [[NNARGS:![0-9]*]]
// CHECK-SAME: identifier:
// CHECK: [[NNARGS]] = !{[[NNARG1:![0-9]*]], [[NNARG2:![0-9]*]]}
// CHECK: [[NNARG1]] = !DITemplateValueParameter(tag: DW_TAG_GNU_template_template_param, name: "tmpl", value: !"tmpl_impl")
// CHECK: [[NNARG2]] = !DITemplateValueParameter(name: "lvr", type: [[INTLVR:![0-9]*]], value: i32* @glb)
// CHECK: [[INTLVR]] = !DIDerivedType(tag: DW_TAG_reference_type, baseType: [[INT]]
NN<tmpl_impl, glb> nn;
// CHECK: ![[PADDINGATEND:[0-9]+]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "PaddingAtEnd",
struct PaddingAtEnd {
int i;
char c;
};
PaddingAtEnd PaddedObj = {};
// CHECK: !DICompositeType(tag: DW_TAG_structure_type, name: "PaddingAtEndTemplate<&PaddedObj>"
// CHECK-SAME: templateParams: [[PTOARGS:![0-9]*]]
// CHECK: [[PTOARGS]] = !{[[PTOARG1:![0-9]*]]}
// CHECK: [[PTOARG1]] = !DITemplateValueParameter(type: [[CONST_PADDINGATEND_PTR:![0-9]*]], value: %struct.PaddingAtEnd* @PaddedObj)
// CHECK: [[CONST_PADDINGATEND_PTR]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: ![[PADDINGATEND]], size: 64)
template <PaddingAtEnd *>
struct PaddingAtEndTemplate {
};
PaddingAtEndTemplate<&PaddedObj> PaddedTemplateObj;
struct ClassTemplateArg {
int a;
float f;
};
template<ClassTemplateArg A> struct ClassTemplateArgTemplate {
static constexpr const ClassTemplateArg &Arg = A;
};
// CHECK: !DICompositeType(tag: DW_TAG_structure_type, name: "ClassTemplateArgTemplate<{1, 2.000000e+00}>", {{.*}}, templateParams: ![[CLASS_TEMP_ARGS:[0-9]*]],
// CHECK: ![[CLASS_TEMP_ARG_CONST_REF_TYPE:[0-9]*]] = !DIDerivedType(tag: DW_TAG_reference_type, baseType: ![[CLASS_TEMP_ARG_CONST_TYPE:[0-9]*]],
// CHECK: ![[CLASS_TEMP_ARG_CONST_TYPE]] = !DIDerivedType(tag: DW_TAG_const_type, baseType: ![[CLASS_TEMP_ARG_TYPE:[0-9]*]])
// CHECK: ![[CLASS_TEMP_ARG_TYPE]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "ClassTemplateArg",
// CHECK: ![[CLASS_TEMP_ARGS]] = !{![[CLASS_TEMP_ARG:[0-9]*]]}
// CHECK: ![[CLASS_TEMP_ARG]] = !DITemplateValueParameter(name: "A", type: ![[CLASS_TEMP_ARG_TYPE]], value: %{{[^ *]+}} { i32 1, float 2.000000e+00 })
ClassTemplateArgTemplate<ClassTemplateArg{1, 2.0f}> ClassTemplateArgObj;
template<const ClassTemplateArg&> struct ClassTemplateArgRefTemplate {};
ClassTemplateArgRefTemplate<ClassTemplateArgObj.Arg> ClassTemplateArgRefObj;
// CHECK: !DICompositeType(tag: DW_TAG_structure_type, name: "ClassTemplateArgRefTemplate<<template param ClassTemplateArg{1, 2.000000e+00}> >", {{.*}}, templateParams: ![[CLASS_TEMP_REF_ARGS:[0-9]*]],
// CHECK: ![[CLASS_TEMP_REF_ARGS]] = !{![[CLASS_TEMP_REF_ARG:[0-9]*]]}
// CHECK: ![[CLASS_TEMP_REF_ARG]] = !DITemplateValueParameter(type: ![[CLASS_TEMP_ARG_CONST_REF_TYPE]], value: %{{.*}}* @_ZTAXtl16ClassTemplateArgLi1ELf40000000EEE)
inline namespace inl {
struct t1 { };
}
template<typename T> struct ClassTemplateInlineNamespaceArg {
};
ClassTemplateInlineNamespaceArg<inl::t1> ClassTemplateInlineNamespaceArgObj;
// CHECK: !DICompositeType(tag: DW_TAG_structure_type, name: "ClassTemplateInlineNamespaceArg<inl::t1>",
namespace IndirectDefaultArgument {
template<typename T1, typename T2 = int>
struct t1 { };
template<typename T>
void f1() {
}
template void f1<t1<int>>();
// CHECK: !DISubprogram(name: "f1<IndirectDefaultArgument::t1<int, int> >",
} // namespace IndirectDefaultArgument
namespace EmptyTrailingPack {
template<typename T>
struct t1 { };
template<typename T, typename ...Ts>
void f1() {
}
template void f1<t1<int>>();
// CHECK: !DISubprogram(name: "f1<EmptyTrailingPack::t1<int> >",
} // namespace EmptyTrailingPack
namespace EmptyInnerPack {
template<typename ...Ts, typename T = int>
void f1() {
}
template void f1<>();
// CHECK: !DISubprogram(name: "f1<int>",
} // namespace EmptyInnerPack
namespace RawFuncQual {
struct t1; // use this to ensure the type parameter doesn't shift due to other test cases in this file
template<typename T1, typename T2, typename T3, typename T4>
void f1() { }
template void f1<t1 () volatile, t1 () const volatile, t1 () &, t1 () &&>();
// CHECK: !DISubprogram(name: "f1<RawFuncQual::t1 () volatile, RawFuncQual::t1 () const volatile, RawFuncQual::t1 () &, RawFuncQual::t1 () &&>",
// CHECK-SAME: templateParams: ![[RAW_FUNC_QUAL_ARGS:[0-9]*]],
// CHECK: ![[RAW_FUNC_QUAL_ARGS]] = !{![[RAW_FUNC_QUAL_T1:[0-9]*]], ![[RAW_FUNC_QUAL_T2:[0-9]*]], ![[RAW_FUNC_QUAL_T3:[0-9]*]], ![[RAW_FUNC_QUAL_T4:[0-9]*]]}
// CHECK: ![[RAW_FUNC_QUAL_T1]] = !DITemplateTypeParameter(name: "T1", type: ![[RAW_FUNC_QUAL_VOL:[0-9]*]])
// CHECK: ![[RAW_FUNC_QUAL_VOL]] = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: ![[RAW_FUNC_QUAL_TYPE:[0-9]*]])
// CHECK: ![[RAW_FUNC_QUAL_TYPE]] = !DISubroutineType(types: ![[RAW_FUNC_QUAL_LIST:[0-9]*]]
// CHECK: ![[RAW_FUNC_QUAL_LIST]] = !{![[RAW_FUNC_QUAL_STRUCT:[0-9]*]]}
// CHECK: ![[RAW_FUNC_QUAL_STRUCT]] = !DICompositeType(tag: DW_TAG_structure_type, name: "t1"
// CHECK: ![[RAW_FUNC_QUAL_T2]] = !DITemplateTypeParameter(name: "T2", type: ![[RAW_FUNC_QUAL_CNST:[0-9]*]])
// CHECK: ![[RAW_FUNC_QUAL_CNST]] = !DIDerivedType(tag: DW_TAG_const_type, baseType: ![[RAW_FUNC_QUAL_TYPE:[0-9]*]])
// CHECK: ![[RAW_FUNC_QUAL_T3]] = !DITemplateTypeParameter(name: "T3", type: ![[RAW_FUNC_QUAL_REF:[0-9]*]])
// CHECK: ![[RAW_FUNC_QUAL_REF]] = !DISubroutineType(flags: DIFlagLValueReference, types: ![[RAW_FUNC_QUAL_LIST]])
// CHECK: ![[RAW_FUNC_QUAL_T4]] = !DITemplateTypeParameter(name: "T4", type: ![[RAW_FUNC_QUAL_REF_REF:[0-9]*]])
// CHECK: ![[RAW_FUNC_QUAL_REF_REF]] = !DISubroutineType(flags: DIFlagRValueReference, types: ![[RAW_FUNC_QUAL_LIST]])
} // namespace RawFuncQual
namespace Nullptr_t {
template <typename T>
void f1() {}
template void f1<decltype(nullptr)>();
// CHECK: !DISubprogram(name: "f1<std::nullptr_t>",
} // namespace Nullptr_t
namespace TemplateTemplateParamInlineNamespace {
inline namespace inl {
template<typename>
struct t1 { };
} // namespace inl
template<template<typename> class> void f1() { }
template void f1<t1>();
// CHECK: !DISubprogram(name: "f1<TemplateTemplateParamInlineNamespace::inl::t1>",
// CHECK-SAME: templateParams: ![[TEMP_TEMP_INL_ARGS:[0-9]*]],
// CHECK: ![[TEMP_TEMP_INL_ARGS]] = !{![[TEMP_TEMP_INL_ARGS_T:[0-9]*]]}
// CHECK: ![[TEMP_TEMP_INL_ARGS_T]] = !DITemplateValueParameter(tag: DW_TAG_GNU_template_template_param, value: !"TemplateTemplateParamInlineNamespace::inl::t1")
} // namespace TemplateTemplateParamInlineNamespace
namespace NoPreferredNames {
template <typename T> struct t1;
using t1i = t1<int>;
template <typename T>
struct __attribute__((__preferred_name__(t1i))) t1 {};
template <typename T>
void f1() {}
template void f1<t1<int>>();
// CHECK: !DISubprogram(name: "f1<NoPreferredNames::t1<int> >",
} // namespace NoPreferredNames
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