1; RUN: opt -passes='module(sancov-module)' -sanitizer-coverage-trace-pc \ 2; RUN: -sanitizer-coverage-level=3 %s -S -o - | FileCheck %s 3 4; The edge between %entry and %for.inc.i is a critical edge. 5; ModuleSanitizerCoveragePass must split this critical edge in order to track 6; coverage of this edge. ModuleSanitizerCoveragePass will also insert calls to 7; @__sanitizer_cov_trace_pc using the debug location from the predecessor's 8; branch. but, if the branch itself is missing debug info (say, by accident 9; due to a bug in an earlier transform), we would fail a verifier check that 10; verifies calls to functions with debug info themselves have debug info. 11; The definition of @__sanitizer_cov_trace_pc may be visible during LTO. 12 13; Of the below checks, we really only care that the calls to 14; @__sanitizer_cov_trace_pc retain !dbg metadata. 15 16define void @update_shadow() !dbg !3 { 17; CHECK-LABEL: @update_shadow( 18; CHECK-NEXT: entry: 19; CHECK-NEXT: call void @__sanitizer_cov_trace_pc() #[[ATTR0:[0-9]+]], !dbg [[DBG6:![0-9]+]] 20; CHECK: entry.for.inc.i_crit_edge: 21; CHECK-NEXT: call void @__sanitizer_cov_trace_pc() #[[ATTR0]], !dbg [[DBG7:![0-9]+]] 22; CHECK: if.end22.i: 23; CHECK-NEXT: call void @__sanitizer_cov_trace_pc() #[[ATTR0]], !dbg [[DBG8:![0-9]+]] 24; CHECK: [[DBG6]] = !DILocation(line: 192, scope: !3) 25; CHECK: [[DBG7]] = !DILocation(line: 0, scope: !3) 26; CHECK: [[DBG8]] = !DILocation(line: 129, column: 2, scope: !3) 27entry: 28 br i1 undef, label %for.inc.i, label %if.end22.i 29 30if.end22.i: ; preds = %entry 31 br label %for.inc.i, !dbg !8 32 33for.inc.i: ; preds = %if.end22.i, %entry 34 ret void, !dbg !6 35} 36 37define void @__sanitizer_cov_trace_pc() !dbg !7{ 38 ret void 39} 40 41!llvm.dbg.cu = !{!0} 42!llvm.module.flags = !{!2} 43 44!0 = distinct !DICompileUnit(language: DW_LANG_C89, file: !1, producer: "", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, splitDebugInlining: false, nameTableKind: None) 45!1 = !DIFile(filename: "kernel/cfi.c", directory: "") 46!2 = !{i32 2, !"Debug Info Version", i32 3} 47!3 = distinct !DISubprogram(name: "update_shadow", scope: !1, file: !1, line: 190, type: !4, scopeLine: 192, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !0) 48!4 = !DISubroutineType(types: !5) 49!5 = !{} 50!6 = !DILocation(line: 223, column: 1, scope: !3) 51!7 = distinct !DISubprogram(name: "__sanitizer_cov_trace_pc", scope: !1, file: !1, line: 200, type: !4, scopeLine: 200, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !0) 52!8 = !DILocation(line: 129, column: 2, scope: !3) 53