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| 1 | +; RUN: llc %s -o %t.o -filetype=obj |
| 2 | +; RUN: llvm-dwarfdump --debug-line %t.o | FileCheck %s --check-prefix=LINES |
| 3 | +; RUN: llc %s -o %t.o -filetype=obj -debug-only=mc-dump 2>&1 | FileCheck %s --check-prefix=FRAGMENTS |
| 4 | + |
| 5 | +;; Test (using mc-dump debug output) that .debug_line can be arranged in memory |
| 6 | +;; using a single data fragment for a simple function, instead of using multiple |
| 7 | +;; MCDwarfFragment fragments in un-necessary cirucmstances. Some targets want |
| 8 | +;; multiple fragments so that they can linker-relax the linetable, but x86 |
| 9 | +;; doesn't. |
| 10 | +;; |
| 11 | +;; First, sanity check that the linetable output is as expected, |
| 12 | + |
| 13 | +; LINES: Address Line Column File ISA Discriminator OpIndex Flags |
| 14 | +; LINES-NEXT: ------------------ ------ ------ ------ --- ------------- ------- ------------- |
| 15 | +; LINES-NEXT: 0x0000000000000000 3 5 0 0 0 0 is_stmt prologue_end |
| 16 | +; LINES-NEXT: 0x0000000000000003 4 12 0 0 0 0 is_stmt |
| 17 | +; LINES-NEXT: 0x0000000000000007 4 3 0 0 0 0 |
| 18 | +; LINES-NEXT: 0x0000000000000008 4 3 0 0 0 0 end_sequence |
| 19 | + |
| 20 | +;; Here's a typical example of .debug_line in a suboptimal arrangement: for each |
| 21 | +;; address-delta there's an MCDwarfFragment computing the delta during |
| 22 | +;; relaxation. |
| 23 | +;; |
| 24 | +;; <MCSection Name:.debug_line Fragments:[ |
| 25 | +;; <MCDataFragment<MCFragment |
| 26 | +;; Contents:[... |
| 27 | +;; Fixups:[... |
| 28 | +;; <MCDwarfFragment<MCFragment 0x5624fe435a80 LayoutOrder:1 Offset:86 HasInstructions:0 BundlePadding:0> |
| 29 | +;; AddrDelta:- LineDelta:1>, |
| 30 | +;; <MCDataFragment<MCFragment 0x5624fe435b00 LayoutOrder:2 Offset:87 HasInstructions:0 BundlePadding:0> |
| 31 | +;; Contents:[05,03,06] (3 bytes)>, |
| 32 | +;; <MCDwarfFragment<MCFragment 0x5624fe435bd0 LayoutOrder:3 Offset:90 HasInstructions:0 BundlePadding:0> |
| 33 | +;; AddrDelta:- LineDelta:0>, |
| 34 | +;; <MCDwarfFragment<MCFragment 0x5624fe435c50 LayoutOrder:4 Offset:91 HasInstructions:0 BundlePadding:0> |
| 35 | +;; AddrDelta:- LineDelta:9223372036854775807>, |
| 36 | +;; <MCDataFragment<MCFragment 0x5624fe435cd0 LayoutOrder:5 Offset:96 HasInstructions:0 BundlePadding:0> |
| 37 | +;; Contents:[] (0 bytes)>]>, |
| 38 | +;; |
| 39 | +;; The function in question is made of a single data fragment where the address |
| 40 | +;; deltas are known at assembly time. We can (and should) emit .debug_line as a |
| 41 | +;; single data fragment. (Check that we see one data fragment, then no more |
| 42 | +;; fragments until the next section). |
| 43 | +; |
| 44 | +; FRAGMENTS: <MCSection Name:.debug_line Fragments:[ |
| 45 | +; FRAGMENTS-NEXT: <MCDataFragment<MCFragment |
| 46 | +; FRAGMENTS-NEXT: Contents:[ |
| 47 | +; FRAGMENTS-NEXT: Fixups:[ |
| 48 | +; |
| 49 | +; FRAGMENTS-NOT: MCDataFragment |
| 50 | +; FRAGMENTS-NOT: MCFragment |
| 51 | +; |
| 52 | +; FRAGMENTS: <MCSection Name:.debug_line_str Fragments:[ |
| 53 | + |
| 54 | +target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128" |
| 55 | +target triple = "x86_64-unknown-linux-gnu" |
| 56 | + |
| 57 | +define dso_local i32 @foo(i32 noundef %a, i32 noundef %b) local_unnamed_addr #0 !dbg !10 { |
| 58 | +entry: |
| 59 | + #dbg_value(i32 %a, !15, !DIExpression(), !17) |
| 60 | + #dbg_value(i32 %b, !16, !DIExpression(), !17) |
| 61 | + %add = add nsw i32 %a, 1, !dbg !18 |
| 62 | + #dbg_value(i32 %add, !15, !DIExpression(), !17) |
| 63 | + %mul = mul nsw i32 %b, 5, !dbg !19 |
| 64 | + #dbg_value(i32 %mul, !16, !DIExpression(), !17) |
| 65 | + %add1 = add nsw i32 %add, %mul, !dbg !20 |
| 66 | + ret i32 %add1, !dbg !21 |
| 67 | +} |
| 68 | + |
| 69 | +!llvm.dbg.cu = !{!0} |
| 70 | +!llvm.module.flags = !{!2, !3, !4, !5, !6, !7, !8} |
| 71 | +!llvm.ident = !{!9} |
| 72 | + |
| 73 | +!0 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "clang version 21.0.0git (/fast/fs/llvm4 8bd196e0eaf4310ad2d9598512d13220b28b9aee)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None) |
| 74 | +!1 = !DIFile(filename: "text.c", directory: "/fast/fs/llvm-main", checksumkind: CSK_MD5, checksum: "e81ed96ea393640bf1b965103b190e09") |
| 75 | +!2 = !{i32 7, !"Dwarf Version", i32 5} |
| 76 | +!3 = !{i32 2, !"Debug Info Version", i32 3} |
| 77 | +!4 = !{i32 1, !"wchar_size", i32 4} |
| 78 | +!5 = !{i32 8, !"PIC Level", i32 2} |
| 79 | +!6 = !{i32 7, !"PIE Level", i32 2} |
| 80 | +!7 = !{i32 7, !"uwtable", i32 2} |
| 81 | +!8 = !{i32 7, !"debug-info-assignment-tracking", i1 true} |
| 82 | +!9 = !{!"clang version 21.0.0git (/fast/fs/llvm4 8bd196e0eaf4310ad2d9598512d13220b28b9aee)"} |
| 83 | +!10 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 1, type: !11, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !14) |
| 84 | +!11 = !DISubroutineType(types: !12) |
| 85 | +!12 = !{!13, !13, !13} |
| 86 | +!13 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) |
| 87 | +!14 = !{!15, !16} |
| 88 | +!15 = !DILocalVariable(name: "a", arg: 1, scope: !10, file: !1, line: 1, type: !13) |
| 89 | +!16 = !DILocalVariable(name: "b", arg: 2, scope: !10, file: !1, line: 1, type: !13) |
| 90 | +!17 = !DILocation(line: 0, scope: !10) |
| 91 | +!18 = !DILocation(line: 2, column: 5, scope: !10) |
| 92 | +!19 = !DILocation(line: 3, column: 5, scope: !10) |
| 93 | +!20 = !DILocation(line: 4, column: 12, scope: !10) |
| 94 | +!21 = !DILocation(line: 4, column: 3, scope: !10) |
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