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