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4ece50737d
Remove LLVM flag -experimental-assignment-tracking. Assignment tracking is still enabled from Clang with the command line -Xclang -fexperimental-assignment-tracking which tells Clang to ask LLVM to run the pass declare-to-assign. That pass converts conventional debug intrinsics to assignment tracking metadata. With this patch it now also sets a module flag debug-info-assignment-tracking with the value `i1 true` (using the flag conflict rule `Max` since enabling assignment tracking on IR that contains only conventional debug intrinsics should cause no issues). Update the docs and tests too. Reviewed By: CarlosAlbertoEnciso Differential Revision: https://reviews.llvm.org/D142027
73 lines
3.2 KiB
LLVM
73 lines
3.2 KiB
LLVM
; RUN: llc %s -stop-before=finalize-isel -o - \
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; RUN: | FileCheck %s
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; Check basic lowering behaviour of dbg.assign intrinsics. The first
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; assignment to `local`, which has been DSE'd, should be represented with a
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; constant value DBG_VALUE. The second assignment should have a DBG_VALUE
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; describing the stack home of the variable.
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; $ cat test.c
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; void esc(int*);
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; void fun() {
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; int local = 5;
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; // ^ killed by v
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; local = 6;
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; esc(&local);
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; }
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; $ clang -O2 -g -emit -llvm -S test.c -o -
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; CHECK: ![[LOCAL:[0-9]+]] = !DILocalVariable(name: "local",
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; CHECK: DBG_VALUE 5, $noreg, ![[LOCAL]], !DIExpression(), debug-location ![[DBG:[0-9]+]]
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; CHECK-NEXT: MOV32mi [[DEST:.*]], 1, $noreg, 0, $noreg, 6
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; CHECK-NEXT: DBG_VALUE [[DEST]], $noreg, ![[LOCAL]], !DIExpression(DW_OP_deref), debug-location ![[DBG]]
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target triple = "x86_64-unknown-linux-gnu"
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define dso_local void @fun() local_unnamed_addr !dbg !7 {
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entry:
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%local = alloca i32, align 4
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call void @llvm.dbg.assign(metadata i32 5, metadata !11, metadata !DIExpression(), metadata !30, metadata ptr %local, metadata !DIExpression()), !dbg !16
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store i32 6, ptr %local, align 4, !dbg !23, !DIAssignID !31
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call void @llvm.dbg.assign(metadata i32 6, metadata !11, metadata !DIExpression(), metadata !31, metadata ptr %local, metadata !DIExpression()), !dbg !16
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call void @esc(ptr nonnull %local), !dbg !24
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ret void, !dbg !25
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}
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declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata)
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declare !dbg !26 dso_local void @esc(ptr) local_unnamed_addr
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5, !1000}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "test.c", directory: "/")
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!2 = !{}
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!3 = !{i32 7, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 12.0.0"}
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!7 = distinct !DISubprogram(name: "fun", scope: !1, file: !1, line: 2, type: !8, scopeLine: 2, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !10)
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!8 = !DISubroutineType(types: !9)
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!9 = !{null}
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!10 = !{!11}
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!11 = !DILocalVariable(name: "local", scope: !7, file: !1, line: 3, type: !12)
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!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!14 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !12)
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!15 = !DILocation(line: 3, column: 3, scope: !7)
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!16 = !DILocation(line: 0, scope: !7)
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!17 = !DILocation(line: 4, column: 3, scope: !7)
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!18 = !DILocation(line: 4, column: 16, scope: !7)
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!23 = !DILocation(line: 5, column: 9, scope: !7)
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!24 = !DILocation(line: 6, column: 3, scope: !7)
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!25 = !DILocation(line: 7, column: 1, scope: !7)
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!26 = !DISubprogram(name: "esc", scope: !1, file: !1, line: 1, type: !27, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
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!27 = !DISubroutineType(types: !28)
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!28 = !{null, !29}
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!29 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
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!30 = distinct !DIAssignID()
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!31 = distinct !DIAssignID()
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!1000 = !{i32 7, !"debug-info-assignment-tracking", i1 true}
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