forked from OSchip/llvm-project
63 lines
2.6 KiB
LLVM
63 lines
2.6 KiB
LLVM
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; RUN: llc -dwarf-version=4 -filetype=obj -O0 \
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; RUN: -mtriple=x86_64-unknown-linux-gnu < %s \
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; RUN: | llvm-dwarfdump -v - | FileCheck %s
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; Verify that the empty DW_OP_piece operations that are created for the
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; optimized-out struct fields `foo' and `baz' are emitted before their
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; succeeding fields' symbol location expressions.
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; Test file based on foo.c:
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;
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; struct {
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; long foo;
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; void *bar;
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; long baz;
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; void *qux;
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; } static var;
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;
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; void *ptr;
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;
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; int main() {
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; if (var.foo == 0)
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; var.bar = var.qux = ptr;
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; return 0;
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; }
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;
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; which was built using:
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;
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; clang -O0 -g2 -S -emit-llvm foo.c -o foo.ll
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; opt -S -globalopt foo.ll -o foo.opt.ll
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; CHECK: DW_AT_name {{.*}}"var"
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; CHECK: DW_AT_location [DW_FORM_exprloc] (DW_OP_piece 0x8, DW_OP_addr 0x0, DW_OP_piece 0x8, DW_OP_piece 0x8, DW_OP_addr 0x0, DW_OP_piece 0x8)
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@var.1 = internal unnamed_addr global i8* null, align 8, !dbg !0
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@var.3 = internal unnamed_addr global i8* null, align 8, !dbg !15
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!16, !17}
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!llvm.ident = !{!18}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression(DW_OP_LLVM_fragment, 64, 64))
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!1 = distinct !DIGlobalVariable(name: "var", scope: !2, file: !3, line: 15, type: !7, isLocal: true, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 7.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
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!3 = !DIFile(filename: "foo.c", directory: "/")
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!4 = !{}
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!5 = !{!6}
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!6 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!7 = distinct !DICompositeType(tag: DW_TAG_structure_type, file: !3, line: 10, size: 256, elements: !8)
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!8 = !{!9, !11, !13, !14}
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!9 = !DIDerivedType(tag: DW_TAG_member, name: "foo", scope: !7, file: !3, line: 11, baseType: !10, size: 64)
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!10 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
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!11 = !DIDerivedType(tag: DW_TAG_member, name: "bar", scope: !7, file: !3, line: 12, baseType: !12, size: 64, offset: 64)
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!12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
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!13 = !DIDerivedType(tag: DW_TAG_member, name: "baz", scope: !7, file: !3, line: 13, baseType: !10, size: 64, offset: 128)
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!14 = !DIDerivedType(tag: DW_TAG_member, name: "qux", scope: !7, file: !3, line: 14, baseType: !12, size: 64, offset: 192)
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!15 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression(DW_OP_LLVM_fragment, 192, 64))
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!16 = !{i32 2, !"Dwarf Version", i32 4}
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!17 = !{i32 2, !"Debug Info Version", i32 3}
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!18 = !{!"clang version 7.0.0"}
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