dac582ad3a
It's noteworthy that GCC has the same bug here, which is a bit
surprising. Both Clang and GCC's bug is only for function template
arguments that are themselves templates with default template arguments
(f1<t1<int[, missing_default_here]>>). Probably because function name
matching isn't generally necessary - whereas type matching is necessary
for DWARF consumers to associate declarations and definitions across
translation units, so the bug's been addressed there already - but
continued to exist for function templates since it's fairly benign
there.
I came across this while working on a change that could reconstitute
these pretty printed names based on the rest of the DWARF, reducing the
size of the DWARF by not having to encode all the template parameters in
the name string. That reconstitution code can't tell the difference
between a defaulted argument or not, so couldn't create the current
buggy-ish output.
Making the names more consistent between direct and indirect references,
and between function and class templates seems all to the good.
(I fixed the function template version of this a few years back in
9fdd09a4cc - clearly I should've looked
more closely and generalized the code better so it only had to be fixed
once - well, doing that here now)
200 lines
10 KiB
C++
200 lines
10 KiB
C++
// RUN: %clang -S -emit-llvm -target x86_64-unknown_unknown -g %s -o - -std=c++20 | FileCheck %s
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// 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]+]]
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// CHECK: @tcn = dso_local global %struct.TC zeroinitializer, align 1, !dbg [[TCN:![0-9]+]]
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// CHECK: @nn = dso_local global %struct.NN zeroinitializer, align 1, !dbg [[NN:![0-9]+]]
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// CHECK: !DICompileUnit(
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// CHECK: [[EMPTY:![0-9]*]] = !{}
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struct foo {
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char pad[8]; // make the member pointer to 'e' a bit more interesting (nonzero)
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int e;
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void f();
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static void g();
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};
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typedef int foo::*foo_mem;
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template<typename T, T, const int *x, foo_mem a, void (foo::*b)(), void (*f)(), int ...Is>
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struct TC {
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struct nested {
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};
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};
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int glb;
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void func();
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// CHECK: [[TCI]] = !DIGlobalVariableExpression(var: [[TCIV:.*]], expr: !DIExpression())
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// CHECK: [[TCIV]] = distinct !DIGlobalVariable(name: "tci",
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// CHECK-SAME: type: ![[TCNESTED:[0-9]+]]
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// CHECK: ![[TCNESTED]] ={{.*}}!DICompositeType(tag: DW_TAG_structure_type, name: "nested",
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// CHECK-SAME: scope: ![[TC:[0-9]+]],
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// CHECK: ![[TC]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "TC<unsigned int, 2, &glb, &foo::e, &foo::f, &foo::g, 1, 2, 3>"
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// CHECK-SAME: templateParams: [[TCARGS:![0-9]*]]
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TC
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// CHECK: [[TCARGS]] = !{[[TCARG1:![0-9]*]], [[TCARG2:![0-9]*]], [[TCARG3:![0-9]*]], [[TCARG4:![0-9]*]], [[TCARG5:![0-9]*]], [[TCARG6:![0-9]*]], [[TCARG7:![0-9]*]]}
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// CHECK: [[TCARG1]] = !DITemplateTypeParameter(name: "T", type: [[UINT:![0-9]*]])
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// CHECK: [[UINT:![0-9]*]] = !DIBasicType(name: "unsigned int"
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< unsigned,
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// CHECK: [[TCARG2]] = !DITemplateValueParameter(type: [[UINT]], value: i32 2)
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2,
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// CHECK: [[TCARG3]] = !DITemplateValueParameter(name: "x", type: [[CINTPTR:![0-9]*]], value: i32* @glb)
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// CHECK: [[CINTPTR]] = !DIDerivedType(tag: DW_TAG_pointer_type, {{.*}}baseType: [[CINT:![0-9]+]]
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// CHECK: [[CINT]] = !DIDerivedType(tag: DW_TAG_const_type, {{.*}}baseType: [[INT:![0-9]+]]
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// CHECK: [[INT]] = !DIBasicType(name: "int"
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&glb,
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// CHECK: [[TCARG4]] = !DITemplateValueParameter(name: "a", type: [[MEMINTPTR:![0-9]*]], value: i64 8)
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// CHECK: [[MEMINTPTR]] = !DIDerivedType(tag: DW_TAG_ptr_to_member_type, {{.*}}baseType: [[INT]], {{.*}}extraData: ![[FOO:[0-9]+]])
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//
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// We could just emit a declaration of 'foo' here, rather than the entire
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// definition (same goes for any time we emit a member (function or data)
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// pointer type)
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// CHECK: [[FOO]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "foo", {{.*}}identifier: "_ZTS3foo")
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// CHECK: !DISubprogram(name: "f", linkageName: "_ZN3foo1fEv", {{.*}}type: [[FTYPE:![0-9]*]]
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//
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// Currently Clang emits the pointer-to-member-function value, but LLVM doesn't
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// use it (GCC doesn't emit a value for pointers to member functions either - so
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// it's not clear what, if any, format would be acceptable to GDB)
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//
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// CHECK: [[FTYPE:![0-9]*]] = !DISubroutineType(types: [[FARGS:![0-9]*]])
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// CHECK: [[FARGS]] = !{null, [[FARG1:![0-9]*]]}
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// CHECK: [[FARG1]] = !DIDerivedType(tag: DW_TAG_pointer_type,
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// CHECK-SAME: baseType: ![[FOO]]
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// CHECK-NOT: line:
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// CHECK-SAME: size: 64
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// CHECK-NOT: offset: 0
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// CHECK-SAME: DIFlagArtificial
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// CHECK: [[FUNTYPE:![0-9]*]] = !DISubroutineType(types: [[FUNARGS:![0-9]*]])
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// CHECK: [[FUNARGS]] = !{null}
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&foo::e,
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// CHECK: [[TCARG5]] = !DITemplateValueParameter(name: "b", type: [[MEMFUNPTR:![0-9]*]], value: { i64, i64 } { i64 ptrtoint (void (%struct.foo*)* @_ZN3foo1fEv to i64), i64 0 })
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// CHECK: [[MEMFUNPTR]] = !DIDerivedType(tag: DW_TAG_ptr_to_member_type, {{.*}}baseType: [[FTYPE]], {{.*}}extraData: ![[FOO]])
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&foo::f,
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// CHECK: [[TCARG6]] = !DITemplateValueParameter(name: "f", type: [[FUNPTR:![0-9]*]], value: void ()* @_ZN3foo1gEv)
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// CHECK: [[FUNPTR]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: [[FUNTYPE]]
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&foo::g,
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// CHECK: [[TCARG7]] = !DITemplateValueParameter(tag: DW_TAG_GNU_template_parameter_pack, name: "Is", value: [[TCARG7_VALS:![0-9]*]])
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// CHECK: [[TCARG7_VALS]] = !{[[TCARG7_1:![0-9]*]], [[TCARG7_2:![0-9]*]], [[TCARG7_3:![0-9]*]]}
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// CHECK: [[TCARG7_1]] = !DITemplateValueParameter(type: [[INT]], value: i32 1)
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1,
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// CHECK: [[TCARG7_2]] = !DITemplateValueParameter(type: [[INT]], value: i32 2)
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2,
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// CHECK: [[TCARG7_3]] = !DITemplateValueParameter(type: [[INT]], value: i32 3)
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3>::nested tci;
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// CHECK: [[TCN]] = !DIGlobalVariableExpression(var: [[TCNV:.*]], expr: !DIExpression())
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// CHECK: [[TCNV]] = distinct !DIGlobalVariable(name: "tcn"
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// CHECK-SAME: type: ![[TCNT:[0-9]+]]
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TC
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// CHECK: ![[TCNT]] ={{.*}}!DICompositeType(tag: DW_TAG_structure_type, name: "TC<int, -3, nullptr, nullptr, nullptr, nullptr>"
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// CHECK-SAME: templateParams: [[TCNARGS:![0-9]*]]
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// CHECK: [[TCNARGS]] = !{[[TCNARG1:![0-9]*]], [[TCNARG2:![0-9]*]], [[TCNARG3:![0-9]*]], [[TCNARG4:![0-9]*]], [[TCNARG5:![0-9]*]], [[TCNARG6:![0-9]*]], [[TCNARG7:![0-9]*]]}
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// CHECK: [[TCNARG1]] = !DITemplateTypeParameter(name: "T", type: [[INT]])
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<int,
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// CHECK: [[TCNARG2]] = !DITemplateValueParameter(type: [[INT]], value: i32 -3)
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-3,
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// CHECK: [[TCNARG3]] = !DITemplateValueParameter(name: "x", type: [[CINTPTR]], value: i8 0)
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nullptr,
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// The interesting null pointer: -1 for member data pointers (since they are
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// just an offset in an object, they can be zero and non-null for the first
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// member)
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// CHECK: [[TCNARG4]] = !DITemplateValueParameter(name: "a", type: [[MEMINTPTR]], value: i64 -1)
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nullptr,
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//
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// In some future iteration we could possibly emit the value of a null member
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// function pointer as '{ i64, i64 } zeroinitializer' as it may be handled
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// naturally from the LLVM CodeGen side once we decide how to handle non-null
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// member function pointers. For now, it's simpler just to emit the 'i8 0'.
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//
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// CHECK: [[TCNARG5]] = !DITemplateValueParameter(name: "b", type: [[MEMFUNPTR]], value: i8 0)
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nullptr,
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// CHECK: [[TCNARG6]] = !DITemplateValueParameter(name: "f", type: [[FUNPTR]], value: i8 0)
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nullptr
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// CHECK: [[TCNARG7]] = !DITemplateValueParameter(tag: DW_TAG_GNU_template_parameter_pack, name: "Is", value: [[EMPTY]])
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> tcn;
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template<typename>
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struct tmpl_impl {
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};
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template <template <typename> class tmpl, int &lvr>
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struct NN {
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};
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// CHECK: [[NN]] = !DIGlobalVariableExpression(var: [[NNV:.*]], expr: !DIExpression())
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// CHECK: [[NNV]] = distinct !DIGlobalVariable(name: "nn"
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// CHECK-SAME: type: ![[NNT:[0-9]+]]
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// CHECK: ![[NNT]] ={{.*}}!DICompositeType(tag: DW_TAG_structure_type, name: "NN<tmpl_impl, glb>",
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// CHECK-SAME: templateParams: [[NNARGS:![0-9]*]]
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// CHECK-SAME: identifier:
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// CHECK: [[NNARGS]] = !{[[NNARG1:![0-9]*]], [[NNARG2:![0-9]*]]}
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// CHECK: [[NNARG1]] = !DITemplateValueParameter(tag: DW_TAG_GNU_template_template_param, name: "tmpl", value: !"tmpl_impl")
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// CHECK: [[NNARG2]] = !DITemplateValueParameter(name: "lvr", type: [[INTLVR:![0-9]*]], value: i32* @glb)
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// CHECK: [[INTLVR]] = !DIDerivedType(tag: DW_TAG_reference_type, baseType: [[INT]]
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NN<tmpl_impl, glb> nn;
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// CHECK: ![[PADDINGATEND:[0-9]+]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "PaddingAtEnd",
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struct PaddingAtEnd {
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int i;
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char c;
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};
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PaddingAtEnd PaddedObj = {};
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// CHECK: !DICompositeType(tag: DW_TAG_structure_type, name: "PaddingAtEndTemplate<&PaddedObj>"
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// CHECK-SAME: templateParams: [[PTOARGS:![0-9]*]]
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// CHECK: [[PTOARGS]] = !{[[PTOARG1:![0-9]*]]}
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// CHECK: [[PTOARG1]] = !DITemplateValueParameter(type: [[CONST_PADDINGATEND_PTR:![0-9]*]], value: %struct.PaddingAtEnd* @PaddedObj)
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// CHECK: [[CONST_PADDINGATEND_PTR]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: ![[PADDINGATEND]], size: 64)
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template <PaddingAtEnd *>
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struct PaddingAtEndTemplate {
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};
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PaddingAtEndTemplate<&PaddedObj> PaddedTemplateObj;
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struct ClassTemplateArg {
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int a;
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float f;
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};
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template<ClassTemplateArg A> struct ClassTemplateArgTemplate {
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static constexpr const ClassTemplateArg &Arg = A;
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};
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// CHECK: !DICompositeType(tag: DW_TAG_structure_type, name: "ClassTemplateArgTemplate<{1, 2.000000e+00}>", {{.*}}, templateParams: ![[CLASS_TEMP_ARGS:[0-9]*]],
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// CHECK: ![[CLASS_TEMP_ARG_CONST_REF_TYPE:[0-9]*]] = !DIDerivedType(tag: DW_TAG_reference_type, baseType: ![[CLASS_TEMP_ARG_CONST_TYPE:[0-9]*]],
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// CHECK: ![[CLASS_TEMP_ARG_CONST_TYPE]] = !DIDerivedType(tag: DW_TAG_const_type, baseType: ![[CLASS_TEMP_ARG_TYPE:[0-9]*]])
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// CHECK: ![[CLASS_TEMP_ARG_TYPE]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "ClassTemplateArg",
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// CHECK: ![[CLASS_TEMP_ARGS]] = !{![[CLASS_TEMP_ARG:[0-9]*]]}
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// CHECK: ![[CLASS_TEMP_ARG]] = !DITemplateValueParameter(name: "A", type: ![[CLASS_TEMP_ARG_TYPE]], value: %{{[^ *]+}} { i32 1, float 2.000000e+00 })
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ClassTemplateArgTemplate<ClassTemplateArg{1, 2.0f}> ClassTemplateArgObj;
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template<const ClassTemplateArg&> struct ClassTemplateArgRefTemplate {};
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ClassTemplateArgRefTemplate<ClassTemplateArgObj.Arg> ClassTemplateArgRefObj;
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// CHECK: !DICompositeType(tag: DW_TAG_structure_type, name: "ClassTemplateArgRefTemplate<<template param ClassTemplateArg{1, 2.000000e+00}> >", {{.*}}, templateParams: ![[CLASS_TEMP_REF_ARGS:[0-9]*]],
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// CHECK: ![[CLASS_TEMP_REF_ARGS]] = !{![[CLASS_TEMP_REF_ARG:[0-9]*]]}
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// CHECK: ![[CLASS_TEMP_REF_ARG]] = !DITemplateValueParameter(type: ![[CLASS_TEMP_ARG_CONST_REF_TYPE]], value: %{{.*}}* @_ZTAXtl16ClassTemplateArgLi1ELf40000000EEE)
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inline namespace inl {
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struct t1 { };
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}
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template<typename T> struct ClassTemplateInlineNamespaceArg {
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};
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ClassTemplateInlineNamespaceArg<inl::t1> ClassTemplateInlineNamespaceArgObj;
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// CHECK: !DICompositeType(tag: DW_TAG_structure_type, name: "ClassTemplateInlineNamespaceArg<inl::t1>",
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namespace IndirectDefaultArgument {
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template<typename T1, typename T2 = int>
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struct t1 { };
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template<typename T>
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void f1() {
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}
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template void f1<t1<int>>();
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// CHECK: !DISubprogram(name: "f1<IndirectDefaultArgument::t1<int, int> >",
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}
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