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llvm-project/clang/test/CodeGenCXX/debug-info-template.cpp
Rafael Espindola 699f5d6bbc Recommit r324107 again. 
The difference from the previous try is that we no longer directly
access function declarations from position independent executables. It
should work, but currently doesn't with some linkers.

It now includes a fix to not mark available_externally definitions as
dso_local.

Original message:

Start setting dso_local in clang.

This starts adding dso_local to clang.

The hope is to eventually have TargetMachine::shouldAssumeDsoLocal go
away. My objective for now is to move enough of it to clang to remove
the need for the TargetMachine one to handle PIE copy relocations and
-fno-plt. With that it should then be easy to implement a
-fno-copy-reloc in clang.

This patch just adds the cases where we assume a symbol to be local
based on the file being compiled for an executable or a shared
library.

llvm-svn: 324535
2018-02-07 22:15:33 +00:00

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// RUN: %clang -S -emit-llvm -target x86_64-unknown_unknown -g %s -o - -std=c++11 | 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(
// CHECK: [[EMPTY:![0-9]*]] = !{}
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, 2, &glb, &foo::e, &foo::f, &foo::g, 1, 2, 3>"
// CHECK-SAME: templateParams: [[TCARGS:![0-9]*]]
TC
// 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, int &&rvr>
struct NN {
};
// CHECK: [[NN]] = !DIGlobalVariableExpression(var: [[NNV:.*]], expr: !DIExpression())
// CHECK: [[NNV]] = distinct !DIGlobalVariable(name: "nn"
// CHECK-SAME: type: ![[NNT:[0-9]+]]
// FIXME: these parameters should probably be rendered as 'glb' rather than
// '&glb', since they're references, not pointers.
// CHECK: ![[NNT]] ={{.*}}!DICompositeType(tag: DW_TAG_structure_type, name: "NN<tmpl_impl, &glb, &glb>",
// CHECK-SAME: templateParams: [[NNARGS:![0-9]*]]
// CHECK-SAME: identifier:
// CHECK: [[NNARGS]] = !{[[NNARG1:![0-9]*]], [[NNARG2:![0-9]*]], [[NNARG3:![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]]
// CHECK: [[NNARG3]] = !DITemplateValueParameter(name: "rvr", type: [[INTRVR:![0-9]*]], value: i32* @glb)
// CHECK: [[INTRVR]] = !DIDerivedType(tag: DW_TAG_rvalue_reference_type, baseType: [[INT]]
NN<tmpl_impl, glb, 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;
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