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$'. This new symbol will allow a debugger to easily associate classes with the physical location of their VTables using only the DWARF information. Previously, this had to be done by searching for ELF symbols with matching names; something that was time-consuming and error-prone in certain edge cases.
88 lines
3.9 KiB
C++
88 lines
3.9 KiB
C++
// REQUIRES: target={{x86_64.*-linux.*}}
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// Virtual inheritance case:
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// For CBase, CLeft, CRight and CDerived we check:
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// - Generation of their vtables (including attributes).
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// - Generation of their '_vtable$' data members:
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// * Correct scope and attributes
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namespace NSP {
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struct CBase {
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int B = 0;
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virtual char fooBase() { return 'B'; }
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};
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}
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namespace NSP_1 {
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struct CLeft : virtual NSP::CBase {
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int M1 = 1;
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char fooBase() override { return 'O'; };
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virtual int fooLeft() { return 1; }
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};
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}
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namespace NSP_2 {
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struct CRight : virtual NSP::CBase {
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int M2 = 2;
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char fooBase() override { return 'T'; };
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virtual int fooRight() { return 2; }
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};
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}
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struct CDerived : NSP_1::CLeft, NSP_2::CRight {
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int D = 3;
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char fooBase() override { return 'D'; };
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int fooDerived() { return 3; };
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};
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int main() {
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NSP::CBase Base;
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NSP_1::CLeft Left;
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NSP_2::CRight Right;
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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: $_ZTVN3NSP5CBaseE = comdat any
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// CHECK: $_ZTVN5NSP_15CLeftE = comdat any
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// CHECK: $_ZTVN5NSP_26CRightE = comdat any
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// CHECK: $_ZTV8CDerived = comdat any
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// CHECK: @_ZTVN3NSP5CBaseE = linkonce_odr {{dso_local|hidden}} unnamed_addr constant {{.*}}, comdat, align 8, !dbg [[BASE_VTABLE_VAR:![0-9]*]]
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// CHECK: @_ZTVN5NSP_15CLeftE = linkonce_odr {{dso_local|hidden}} unnamed_addr constant {{.*}}, comdat, align 8, !dbg [[LEFT_VTABLE_VAR:![0-9]*]]
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// CHECK: @_ZTVN5NSP_26CRightE = linkonce_odr {{dso_local|hidden}} unnamed_addr constant {{.*}}, comdat, align 8, !dbg [[RIGHT_VTABLE_VAR:![0-9]*]]
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// CHECK: @_ZTV8CDerived = linkonce_odr {{dso_local|hidden}} unnamed_addr constant {{.*}}, comdat, align 8, !dbg [[DERIVED_VTABLE_VAR:![0-9]*]]
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// CHECK: [[BASE_VTABLE_VAR]] = !DIGlobalVariableExpression(var: [[BASE_VTABLE:![0-9]*]], expr: !DIExpression())
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// CHECK-NEXT: [[BASE_VTABLE]] = distinct !DIGlobalVariable(name: "_vtable$", linkageName: "_ZTVN3NSP5CBaseE"
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// CHECK: [[LEFT_VTABLE_VAR]] = !DIGlobalVariableExpression(var: [[LEFT_VTABLE:![0-9]*]], expr: !DIExpression())
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// CHECK-NEXT: [[LEFT_VTABLE]] = distinct !DIGlobalVariable(name: "_vtable$", linkageName: "_ZTVN5NSP_15CLeftE"
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// CHECK: [[TYPE:![0-9]*]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
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// CHECK: !DIDerivedType(tag: DW_TAG_variable, name: "_vtable$", scope: [[LEFT:![0-9]*]], file: {{.*}}, baseType: [[TYPE]], flags: DIFlagPrivate | DIFlagArtificial | DIFlagStaticMember)
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// CHECK: [[LEFT]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "CLeft"
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// CHECK: [[BASE:![0-9]*]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "CBase"
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// CHECK: [[RIGHT_VTABLE_VAR]] = !DIGlobalVariableExpression(var: [[RIGHT_VTABLE:![0-9]*]], expr: !DIExpression())
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// CHECK-NEXT: [[RIGHT_VTABLE]] = distinct !DIGlobalVariable(name: "_vtable$", linkageName: "_ZTVN5NSP_26CRightE"
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// CHECK: !DIDerivedType(tag: DW_TAG_variable, name: "_vtable$", scope: [[RIGHT:![0-9]*]], file: {{.*}}, baseType: [[TYPE]], flags: DIFlagPrivate | DIFlagArtificial | DIFlagStaticMember)
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// CHECK: [[RIGHT]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "CRight"
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// CHECK: [[DERIVED_VTABLE_VAR]] = !DIGlobalVariableExpression(var: [[DERIVED_VTABLE:![0-9]*]], expr: !DIExpression())
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// CHECK-NEXT: [[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: !DIDerivedType(tag: DW_TAG_variable, name: "_vtable$", scope: [[BASE]], file: {{.*}}, baseType: [[TYPE]], flags: DIFlagPrivate | DIFlagArtificial | DIFlagStaticMember)
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