d1b0cbff80
The IR now includes a global variable for the debugger that holds the address of the vtable. Now every class that contains virtual functions, has a static member (marked as artificial) that identifies where that vtable is loaded in memory. The unmangled name is '_vtable$'. This new symbol will allow a debugger to easily associate classes with the physical location of their VTables using only the DWARF information. Previously, this had to be done by searching for ELF symbols with matching names; something that was time-consuming and error-prone in certain edge cases.
73 lines
3.2 KiB
C++
73 lines
3.2 KiB
C++
// REQUIRES: target={{x86_64.*-linux.*}}
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// Multiple inheritance case:
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// For CBaseOne, CBaseTwo and CDerived we check:
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// - Generation of their vtables (including attributes).
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// - Generation of their '_vtable$' data members:
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// * Correct scope and attributes
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namespace NSP_1 {
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struct CBaseOne {
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int B1 = 1;
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virtual int one() { return 1; }
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virtual int two() { return 2; }
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virtual int three() { return 3; }
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};
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}
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namespace NSP_2 {
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struct CBaseTwo {
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int B2 = 1;
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virtual int four() { return 4; }
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virtual int five() { return 5; }
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virtual int six() { return 6; }
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};
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}
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struct CDerived : NSP_1::CBaseOne, NSP_2::CBaseTwo {
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int D = 1;
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int two() override { return 22; };
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int six() override { return 66; }
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};
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int main() {
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NSP_1::CBaseOne BaseOne;
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NSP_2::CBaseTwo BaseTwo;
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CDerived Derived;
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return 0;
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}
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// RUN: %clang --target=x86_64-linux -Xclang -disable-O0-optnone -Xclang -disable-llvm-passes -emit-llvm -S -g %s -o - | FileCheck %s
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// CHECK: $_ZTVN5NSP_18CBaseOneE = comdat any
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// CHECK: $_ZTVN5NSP_28CBaseTwoE = comdat any
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// CHECK: $_ZTV8CDerived = comdat any
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// CHECK: @_ZTVN5NSP_18CBaseOneE = linkonce_odr {{dso_local|hidden}} unnamed_addr constant {{.*}}, comdat, align 8, !dbg [[BASE_ONE_VTABLE_VAR:![0-9]*]]
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// CHECK: @_ZTVN5NSP_28CBaseTwoE = linkonce_odr {{dso_local|hidden}} unnamed_addr constant {{.*}}, comdat, align 8, !dbg [[BASE_TWO_VTABLE_VAR:![0-9]*]]
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// CHECK: @_ZTV8CDerived = linkonce_odr {{dso_local|hidden}} unnamed_addr constant {{.*}}, comdat, align 8, !dbg [[DERIVED_VTABLE_VAR:![0-9]*]]
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// CHECK: [[BASE_ONE_VTABLE_VAR]] = !DIGlobalVariableExpression(var: [[BASE_ONE_VTABLE:![0-9]*]], expr: !DIExpression())
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// CHECK-NEXT: [[BASE_ONE_VTABLE]] = distinct !DIGlobalVariable(name: "_vtable$", linkageName: "_ZTVN5NSP_18CBaseOneE"
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// CHECK: [[BASE_TWO_VTABLE_VAR]] = !DIGlobalVariableExpression(var: [[BASE_TWO_VTABLE:![0-9]*]], expr: !DIExpression())
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// CHECK-NEXT: [[BASE_TWO_VTABLE]] = distinct !DIGlobalVariable(name: "_vtable$", linkageName: "_ZTVN5NSP_28CBaseTwoE"
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// CHECK: [[TYPE:![0-9]*]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
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// CHECK: !DIDerivedType(tag: DW_TAG_variable, name: "_vtable$", scope: [[BASE_TWO:![0-9]*]], file: {{.*}}, baseType: [[TYPE]], flags: DIFlagPrivate | DIFlagArtificial | DIFlagStaticMember)
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// check: [[BASE_TWO]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "CBaseTwo"
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// CHECK: [[DERIVED_VTABLE_VAR]] = !DIGlobalVariableExpression(var: [[DERIVED_VTABLE:![0-9]*]], expr: !DIExpression())
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// CHECK: [[DERIVED_VTABLE]] = distinct !DIGlobalVariable(name: "_vtable$", linkageName: "_ZTV8CDerived"
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// CHECK: !DIDerivedType(tag: DW_TAG_variable, name: "_vtable$", scope: [[DERIVED:![0-9]*]], file: {{.*}}, baseType: [[TYPE]], flags: DIFlagPrivate | DIFlagArtificial | DIFlagStaticMember)
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// CHECK: [[DERIVED]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "CDerived"
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// CHECK: [[BASE_ONE:![0-9]*]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "CBaseOne"
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// CHECK: !DIDerivedType(tag: DW_TAG_variable, name: "_vtable$", scope: [[BASE_ONE]], file: {{.*}}, baseType: [[TYPE]], flags: DIFlagPrivate | DIFlagArtificial | DIFlagStaticMember)
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