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e1cd258b7d
Summary: When emitting the location for a global variable with fragmented debug expressions, make sure that the offset pieces, which represent optimized-out parts of the variable, are emitted before their succeeding fragments' expressions. Previously, if the succeeding fragment's location was a symbol, the offset piece was emitted after, rather than before, that symbol's expression. This effectively meant that the symbols were associated with the wrong parts of the variable. This fixes PR36085. Patch by: David Stenberg Reviewers: aprantl, probinson, dblaikie Reviewed By: aprantl Subscribers: JDevlieghere, llvm-commits Tags: #debug-info Differential Revision: https://reviews.llvm.org/D42527 llvm-svn: 323644
63 lines
2.6 KiB
LLVM
63 lines
2.6 KiB
LLVM
; 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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