Index: lib/CodeGen/LiveInterval.cpp =================================================================== --- lib/CodeGen/LiveInterval.cpp +++ lib/CodeGen/LiveInterval.cpp @@ -1310,17 +1310,17 @@ MachineOperand &MO = *RI; MachineInstr *MI = RI->getParent(); ++RI; - // DBG_VALUE instructions don't have slot indexes, so get the index of the - // instruction before them. - // Normally, DBG_VALUE instructions are removed before this function is - // called, but it is not a requirement. - SlotIndex Idx; - if (MI->isDebugValue()) - Idx = LIS.getSlotIndexes()->getIndexBefore(*MI); - else - Idx = LIS.getInstructionIndex(*MI); - LiveQueryResult LRQ = LI.Query(Idx); - const VNInfo *VNI = MO.readsReg() ? LRQ.valueIn() : LRQ.valueDefined(); + const VNInfo *VNI; + if (MI->isDebugValue()) { + // DBG_VALUE instructions don't have slot indexes, so get the index of + // the instruction before them. The value is defined there too. + SlotIndex Idx = LIS.getSlotIndexes()->getIndexBefore(*MI); + VNI = LI.Query(Idx).valueOut(); + } else { + SlotIndex Idx = LIS.getInstructionIndex(*MI); + LiveQueryResult LRQ = LI.Query(Idx); + VNI = MO.readsReg() ? LRQ.valueIn() : LRQ.valueDefined(); + } // In the case of an use that isn't tied to any def, VNI will be // NULL. If the use is tied to a def, VNI will be the defined value. if (!VNI) Index: test/DebugInfo/WebAssembly/dbg-value-live-interval.ll =================================================================== --- /dev/null +++ test/DebugInfo/WebAssembly/dbg-value-live-interval.ll @@ -0,0 +1,110 @@ +; RUN: llc < %s -print-machineinstrs 2>&1 | FileCheck %s + +; CHECK: After WebAssembly Optimize Live Intervals: +; CHECK: bb.3.for.body.for.body_crit_edge: +; CHECK: [[REG:%[0-9]+]]:i32 = ADD_I32 {{.*}} fib.c:7:7 +; CHECK: DBG_VALUE debug-use [[REG]]:i32, debug-use $noreg, !"a", {{.*}} fib.c:5:13 +; CHECK: After WebAssembly Store Results: + +; ModuleID = 'fib.bc' +source_filename = "fib.c" +; void swap(int* a, int* b); +; +; __attribute__ ((visibility ("default"))) +; int fib(int n) { +; int i, t, a = 0, b = 1; +; for (i = 0; i < n; i++) { +; a += b; +; swap(&a, &b); +; } +; return b; +; } +target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128" +target triple = "wasm32-unknown-unknown-wasm" + +; Function Attrs: nounwind +define i32 @fib(i32 %n) local_unnamed_addr #0 !dbg !7 { +entry: + %a = alloca i32, align 4 + %b = alloca i32, align 4 + %0 = bitcast i32* %a to i8*, !dbg !18 + call void @llvm.dbg.value(metadata i32 0, metadata !15, metadata !DIExpression()), !dbg !19 + store i32 0, i32* %a, align 4, !dbg !19, !tbaa !20 + %1 = bitcast i32* %b to i8*, !dbg !18 + store i32 1, i32* %b, align 4, !dbg !24, !tbaa !20 + %cmp4 = icmp sgt i32 %n, 0, !dbg !26 + br i1 %cmp4, label %for.body.preheader, label %for.end, !dbg !29 + +for.body.preheader: ; preds = %entry + call void @llvm.dbg.value(metadata i32 0, metadata !15, metadata !DIExpression()), !dbg !19 + store i32 1, i32* %a, align 4, !dbg !30, !tbaa !20 + call void @llvm.dbg.value(metadata i32* %a, metadata !15, metadata !DIExpression()), !dbg !19 + call void @swap(i32* nonnull %a, i32* nonnull %b) #5, !dbg !32 + %2 = load i32, i32* %b, align 4, !dbg !33, !tbaa !20 + %exitcond9 = icmp eq i32 %n, 1, !dbg !26 + br i1 %exitcond9, label %for.end, label %for.body.for.body_crit_edge, !dbg !29, !llvm.loop !34 + +for.body.for.body_crit_edge: ; preds = %for.body.preheader, %for.body.for.body_crit_edge + %3 = phi i32 [ %4, %for.body.for.body_crit_edge ], [ %2, %for.body.preheader ] + %inc10 = phi i32 [ %inc, %for.body.for.body_crit_edge ], [ 1, %for.body.preheader ] + %.pre = load i32, i32* %a, align 4, !dbg !30, !tbaa !20 + call void @llvm.dbg.value(metadata i32 %.pre, metadata !15, metadata !DIExpression()), !dbg !19 + %add = add nsw i32 %.pre, %3, !dbg !30 + call void @llvm.dbg.value(metadata i32 %add, metadata !15, metadata !DIExpression()), !dbg !19 + store i32 %add, i32* %a, align 4, !dbg !30, !tbaa !20 + call void @llvm.dbg.value(metadata i32* %a, metadata !15, metadata !DIExpression()), !dbg !19 + call void @swap(i32* nonnull %a, i32* nonnull %b) #5, !dbg !32 + %inc = add nuw nsw i32 %inc10, 1, !dbg !36 + %4 = load i32, i32* %b, align 4, !dbg !33, !tbaa !20 + %exitcond = icmp eq i32 %inc, %n, !dbg !26 + br i1 %exitcond, label %for.end, label %for.body.for.body_crit_edge, !dbg !29, !llvm.loop !34 + +for.end: ; preds = %for.body.for.body_crit_edge, %for.body.preheader, %entry + %.lcssa = phi i32 [ 1, %entry ], [ %2, %for.body.preheader ], [ %4, %for.body.for.body_crit_edge ] + ret i32 %.lcssa, !dbg !38 +} + +declare void @swap(i32*, i32*) local_unnamed_addr #2 + +; Function Attrs: nounwind readnone speculatable +declare void @llvm.dbg.value(metadata, metadata, metadata) #4 + +!llvm.dbg.cu = !{!0} +!llvm.module.flags = !{!3, !4, !5} +!llvm.ident = !{!6} + +!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 7.0.0 (trunk 334610)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2) +!1 = !DIFile(filename: "fib.c", directory: "/d/y/llvmwasm") +!2 = !{} +!3 = !{i32 2, !"Dwarf Version", i32 4} +!4 = !{i32 2, !"Debug Info Version", i32 3} +!5 = !{i32 1, !"wchar_size", i32 4} +!6 = !{!"clang version 7.0.0 (trunk 334610)"} +!7 = distinct !DISubprogram(name: "fib", scope: !1, file: !1, line: 4, type: !8, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !11) +!8 = !DISubroutineType(types: !9) +!9 = !{!10, !10} +!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) +!11 = !{!15} +!15 = !DILocalVariable(name: "a", scope: !7, file: !1, line: 5, type: !10) +!17 = !DILocation(line: 4, column: 13, scope: !7) +!18 = !DILocation(line: 5, column: 3, scope: !7) +!19 = !DILocation(line: 5, column: 13, scope: !7) +!20 = !{!21, !21, i64 0} +!21 = !{!"int", !22, i64 0} +!22 = !{!"omnipotent char", !23, i64 0} +!23 = !{!"Simple C/C++ TBAA"} +!24 = !DILocation(line: 5, column: 20, scope: !7) +!25 = !DILocation(line: 5, column: 7, scope: !7) +!26 = !DILocation(line: 6, column: 17, scope: !27) +!27 = distinct !DILexicalBlock(scope: !28, file: !1, line: 6, column: 3) +!28 = distinct !DILexicalBlock(scope: !7, file: !1, line: 6, column: 3) +!29 = !DILocation(line: 6, column: 3, scope: !28) +!30 = !DILocation(line: 7, column: 7, scope: !31) +!31 = distinct !DILexicalBlock(scope: !27, file: !1, line: 6, column: 27) +!32 = !DILocation(line: 8, column: 5, scope: !31) +!33 = !DILocation(line: 0, scope: !7) +!34 = distinct !{!34, !29, !35} +!35 = !DILocation(line: 9, column: 3, scope: !28) +!36 = !DILocation(line: 6, column: 23, scope: !27) +!37 = !DILocation(line: 11, column: 1, scope: !7) +!38 = !DILocation(line: 10, column: 3, scope: !7)