return Changed;
}
-void UserValue::extendDef(SlotIndex Idx, unsigned LocNo,
- LiveRange *LR, const VNInfo *VNI,
- SmallVectorImpl<SlotIndex> *Kills,
+/// We only propagate DBG_VALUES locally here. LiveDebugValues performs a
+/// data-flow analysis to propagate them beyond basic block boundaries.
+void UserValue::extendDef(SlotIndex Idx, unsigned LocNo, LiveRange *LR,
+ const VNInfo *VNI, SmallVectorImpl<SlotIndex> *Kills,
LiveIntervals &LIS, MachineDominatorTree &MDT,
UserValueScopes &UVS) {
- SmallVector<SlotIndex, 16> Todo;
- Todo.push_back(Idx);
- do {
- SlotIndex Start = Todo.pop_back_val();
- MachineBasicBlock *MBB = LIS.getMBBFromIndex(Start);
- SlotIndex Stop = LIS.getMBBEndIdx(MBB);
- LocMap::iterator I = locInts.find(Start);
-
- // Limit to VNI's live range.
- bool ToEnd = true;
- if (LR && VNI) {
- LiveInterval::Segment *Segment = LR->getSegmentContaining(Start);
- if (!Segment || Segment->valno != VNI) {
- if (Kills)
- Kills->push_back(Start);
- continue;
- }
- if (Segment->end < Stop)
- Stop = Segment->end, ToEnd = false;
- }
-
- // There could already be a short def at Start.
- if (I.valid() && I.start() <= Start) {
- // Stop when meeting a different location or an already extended interval.
- Start = Start.getNextSlot();
- if (I.value() != LocNo || I.stop() != Start)
- continue;
- // This is a one-slot placeholder. Just skip it.
- ++I;
+ SlotIndex Start = Idx;
+ MachineBasicBlock *MBB = LIS.getMBBFromIndex(Start);
+ SlotIndex Stop = LIS.getMBBEndIdx(MBB);
+ LocMap::iterator I = locInts.find(Start);
+
+ // Limit to VNI's live range.
+ bool ToEnd = true;
+ if (LR && VNI) {
+ LiveInterval::Segment *Segment = LR->getSegmentContaining(Start);
+ if (!Segment || Segment->valno != VNI) {
+ if (Kills)
+ Kills->push_back(Start);
+ return;
}
+ if (Segment->end < Stop)
+ Stop = Segment->end, ToEnd = false;
+ }
- // Limited by the next def.
- if (I.valid() && I.start() < Stop)
- Stop = I.start(), ToEnd = false;
- // Limited by VNI's live range.
- else if (!ToEnd && Kills)
- Kills->push_back(Stop);
+ // There could already be a short def at Start.
+ if (I.valid() && I.start() <= Start) {
+ // Stop when meeting a different location or an already extended interval.
+ Start = Start.getNextSlot();
+ if (I.value() != LocNo || I.stop() != Start)
+ return;
+ // This is a one-slot placeholder. Just skip it.
+ ++I;
+ }
- if (Start >= Stop)
- continue;
+ // Limited by the next def.
+ if (I.valid() && I.start() < Stop)
+ Stop = I.start(), ToEnd = false;
+ // Limited by VNI's live range.
+ else if (!ToEnd && Kills)
+ Kills->push_back(Stop);
+ if (Start < Stop)
I.insert(Start, Stop, LocNo);
-
- // If we extended to the MBB end, propagate down the dominator tree.
- if (!ToEnd)
- continue;
- const std::vector<MachineDomTreeNode*> &Children =
- MDT.getNode(MBB)->getChildren();
- for (unsigned i = 0, e = Children.size(); i != e; ++i) {
- MachineBasicBlock *MBB = Children[i]->getBlock();
- if (UVS.dominates(MBB))
- Todo.push_back(LIS.getMBBStartIdx(MBB));
- }
- } while (!Todo.empty());
}
void
--- /dev/null
+; RUN: llc -mtriple=x86_64-apple-macosx10.9.0 %s -stop-after=livedebugvars \
+; RUN: -o %t.s | FileCheck %s
+; Generated from:
+; void g(int *);
+; int f() {
+; int x = 23;
+; g(&x);
+; if (x == 42)
+; ++x;
+; return x; // check that x is not a constant here.
+; }
+; CHECK: ![[X:.*]] = !DILocalVariable(name: "x",
+; CHECK: bb.0.entry:
+; CHECK: DBG_VALUE 23, 0, ![[X]],
+; CHECK: DBG_VALUE debug-use %rdi, debug-use _, ![[X]]
+; CHECK: bb.1.if.then:
+; CHECK: DBG_VALUE debug-use %rdi, debug-use _, ![[X]],
+; CHECK: bb.2.if.end:
+; CHECK-NOT: DBG_VALUE 23, 0, ![[X]],
+; CHECK: RETQ %eax
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.11.0"
+
+; Function Attrs: nounwind ssp uwtable
+define i32 @f() #0 !dbg !4 {
+entry:
+ %x = alloca i32, align 4
+ %0 = bitcast i32* %x to i8*, !dbg !14
+ call void @llvm.lifetime.start(i64 4, i8* %0) #4, !dbg !14
+ tail call void @llvm.dbg.value(metadata i32 23, i64 0, metadata !9, metadata !15), !dbg !16
+ store i32 23, i32* %x, align 4, !dbg !16, !tbaa !17
+ tail call void @llvm.dbg.value(metadata i32* %x, i64 0, metadata !9, metadata !15), !dbg !16
+ call void @g(i32* nonnull %x) #4, !dbg !21
+ call void @llvm.dbg.value(metadata i32* %x, i64 0, metadata !9, metadata !15), !dbg !16
+ %1 = load i32, i32* %x, align 4, !dbg !22, !tbaa !17
+ %cmp = icmp eq i32 %1, 42, !dbg !24
+ br i1 %cmp, label %if.then, label %if.end, !dbg !25
+
+if.then: ; preds = %entry
+ call void @llvm.dbg.value(metadata i32 43, i64 0, metadata !9, metadata !15), !dbg !16
+ store i32 43, i32* %x, align 4, !dbg !26, !tbaa !17
+ br label %if.end, !dbg !26
+
+if.end: ; preds = %if.then, %entry
+ %2 = phi i32 [ 43, %if.then ], [ %1, %entry ], !dbg !27
+ call void @llvm.dbg.value(metadata i32* %x, i64 0, metadata !9, metadata !15), !dbg !16
+ call void @llvm.lifetime.end(i64 4, i8* %0) #4, !dbg !28
+ ret i32 %2, !dbg !29
+}
+
+; Function Attrs: argmemonly nounwind
+declare void @llvm.lifetime.start(i64, i8* nocapture) #1
+
+declare void @g(i32*) #4
+
+; Function Attrs: argmemonly nounwind
+declare void @llvm.lifetime.end(i64, i8* nocapture) #1
+
+; Function Attrs: nounwind readnone
+declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #3
+
+attributes #0 = { nounwind ssp uwtable }
+attributes #1 = { argmemonly nounwind }
+attributes #3 = { nounwind readnone }
+attributes #4 = { nounwind }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!10, !11, !12}
+!llvm.ident = !{!13}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.8.0 (trunk 255890) (llvm/trunk 255919)", isOptimized: true, runtimeVersion: 0, emissionKind: 1, enums: !2, subprograms: !3)
+!1 = !DIFile(filename: "constant.c", directory: "")
+!2 = !{}
+!3 = !{!4}
+!4 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 2, type: !5, isLocal: false, isDefinition: true, scopeLine: 2, isOptimized: true, variables: !8)
+!5 = !DISubroutineType(types: !6)
+!6 = !{!7}
+!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
+!8 = !{!9}
+!9 = !DILocalVariable(name: "x", scope: !4, file: !1, line: 3, type: !7)
+!10 = !{i32 2, !"Dwarf Version", i32 2}
+!11 = !{i32 2, !"Debug Info Version", i32 3}
+!12 = !{i32 1, !"PIC Level", i32 2}
+!13 = !{!"clang version 3.8.0 (trunk 255890) (llvm/trunk 255919)"}
+!14 = !DILocation(line: 3, column: 3, scope: !4)
+!15 = !DIExpression()
+!16 = !DILocation(line: 3, column: 7, scope: !4)
+!17 = !{!18, !18, i64 0}
+!18 = !{!"int", !19, i64 0}
+!19 = !{!"omnipotent char", !20, i64 0}
+!20 = !{!"Simple C/C++ TBAA"}
+!21 = !DILocation(line: 4, column: 3, scope: !4)
+!22 = !DILocation(line: 5, column: 7, scope: !23)
+!23 = distinct !DILexicalBlock(scope: !4, file: !1, line: 5, column: 7)
+!24 = !DILocation(line: 5, column: 9, scope: !23)
+!25 = !DILocation(line: 5, column: 7, scope: !4)
+!26 = !DILocation(line: 6, column: 5, scope: !23)
+!27 = !DILocation(line: 7, column: 10, scope: !4)
+!28 = !DILocation(line: 8, column: 1, scope: !4)
+!29 = !DILocation(line: 7, column: 3, scope: !4)
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