95 lines · plain
1; RUN: llc %s -o %t.o -filetype=obj2; RUN: llvm-dwarfdump --debug-line %t.o | FileCheck %s --check-prefix=LINES3; RUN: llc %s -o %t.o -filetype=obj -debug-only=mc-dump 2>&1 | FileCheck %s --check-prefix=FRAGMENTS4;5; REQUIRES: asserts6 7;; Test (using mc-dump debug output) that .debug_line can be arranged in memory8;; using a single data fragment for a simple function, instead of using multiple9;; MCDwarfFragment fragments in un-necessary cirucmstances. Some targets want10;; multiple fragments so that they can linker-relax the linetable, but x8611;; doesn't.12;;13;; First, sanity check that the linetable output is as expected,14 15; LINES: Address Line Column File ISA Discriminator OpIndex Flags16; LINES-NEXT: ------------------ ------ ------ ------ --- ------------- ------- -------------17; LINES-NEXT: 0x0000000000000000 3 5 0 0 0 0 is_stmt prologue_end18; LINES-NEXT: 0x0000000000000003 4 12 0 0 0 0 is_stmt19; LINES-NEXT: 0x0000000000000007 4 3 0 0 0 020; LINES-NEXT: 0x0000000000000008 4 3 0 0 0 0 end_sequence21 22;; Here's a typical example of .debug_line in a suboptimal arrangement: for each23;; address-delta there's an MCDwarfFragment computing the delta during24;; relaxation.25;;26;; <MCSection Name:.debug_line Fragments:[27;; <MCDataFragment<MCFragment28;; Contents:[...29;; Fixups:[...30;; <MCDwarfFragment<MCFragment 0x5624fe435a80 LayoutOrder:1 Offset:86 HasInstructions:0 BundlePadding:0>31;; AddrDelta:- LineDelta:1>,32;; <MCDataFragment<MCFragment 0x5624fe435b00 LayoutOrder:2 Offset:87 HasInstructions:0 BundlePadding:0>33;; Contents:[05,03,06] (3 bytes)>,34;; <MCDwarfFragment<MCFragment 0x5624fe435bd0 LayoutOrder:3 Offset:90 HasInstructions:0 BundlePadding:0>35;; AddrDelta:- LineDelta:0>,36;; <MCDwarfFragment<MCFragment 0x5624fe435c50 LayoutOrder:4 Offset:91 HasInstructions:0 BundlePadding:0>37;; AddrDelta:- LineDelta:9223372036854775807>,38;; <MCDataFragment<MCFragment 0x5624fe435cd0 LayoutOrder:5 Offset:96 HasInstructions:0 BundlePadding:0>39;; Contents:[] (0 bytes)>]>,40;;41;; The function in question is made of a single data fragment where the address42;; deltas are known at assembly time. We can (and should) emit .debug_line as a43;; single data fragment. (Check that we see one data fragment, then no more44;; fragments until the next section).45;46; FRAGMENTS: Section Name:.debug_line47; FRAGMENTS-NEXT: Data48; FRAGMENTS-NEXT: Fixup49;50; FRAGMENTS-NOT: Data51;52; FRAGMENTS: Section Name:.debug_line_str53 54target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"55target triple = "x86_64-unknown-linux-gnu"56 57define dso_local i32 @foo(i32 noundef %a, i32 noundef %b) local_unnamed_addr #0 !dbg !10 {58entry:59 #dbg_value(i32 %a, !15, !DIExpression(), !17)60 #dbg_value(i32 %b, !16, !DIExpression(), !17)61 %add = add nsw i32 %a, 1, !dbg !1862 #dbg_value(i32 %add, !15, !DIExpression(), !17)63 %mul = mul nsw i32 %b, 5, !dbg !1964 #dbg_value(i32 %mul, !16, !DIExpression(), !17)65 %add1 = add nsw i32 %add, %mul, !dbg !2066 ret i32 %add1, !dbg !2167}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)95