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1; RUN: opt -passes='module(sancov-module)' -sanitizer-coverage-trace-pc -sanitizer-coverage-level=3 %s -S -o - | FileCheck %s2 3; The edge between %entry and %for.inc.i is a critical edge.4; SanitizerCoveragePass must split this critical edge in order to track5; coverage of this edge. SanitizerCoveragePass will also insert calls to6; @__sanitizer_cov_trace_pc using the debug location from the predecessor's7; branch. but, if the branch itself is missing debug info (say, by accident8; due to a bug in an earlier transform), we would fail a verifier check that9; 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 to13; @__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.i28 29if.end22.i: ; preds = %entry30 br label %for.inc.i, !dbg !831 32for.inc.i: ; preds = %if.end22.i, %entry33 ret void, !dbg !634}35 36define void @__sanitizer_cov_trace_pc() !dbg !7{37 ret void38}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