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[DebugInfo][Dexter] Unreachable line stepped onto after SimplifyCFG.
When SimplifyCFG changes the PHI node into a select instruction, the debug line records becomes ambiguous. It causes the debugger to display unreachable source lines. Differential Revision: https://reviews.llvm.org/D53287 llvm-svn: 345250
This commit is contained in:
Carlos Alberto Enciso
parent
5eb75bc24f
commit
7fb4bf91f1
@ -446,6 +446,15 @@ void copyRangeMetadata(const DataLayout &DL, const LoadInst &OldLI, MDNode *N,
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/// Remove the debug intrinsic instructions for the given instruction.
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void dropDebugUsers(Instruction &I);
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/// Hoist all of the instructions in the \p IfBlock to the dominant block
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/// \p DomBlock, by moving its instructions to the insertion point \p InsertPt.
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///
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/// The moved instructions receive the insertion point debug location values
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/// (DILocations) and their debug intrinsic instructions (dbg.values) are
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/// removed.
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void hoistAllInstructionsInto(BasicBlock *DomBlock, Instruction *InsertPt,
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BasicBlock *BB);
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//===----------------------------------------------------------------------===//
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// Intrinsic pattern matching
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//
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@ -2529,6 +2529,47 @@ void llvm::dropDebugUsers(Instruction &I) {
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DII->eraseFromParent();
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}
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void llvm::hoistAllInstructionsInto(BasicBlock *DomBlock, Instruction *InsertPt,
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BasicBlock *BB) {
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// Since we are moving the instructions out of its basic block, we do not
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// retain their original debug locations (DILocations) and debug intrinsic
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// instructions (dbg.values).
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//
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// Doing so would degrade the debugging experience and adversely affect the
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// accuracy of profiling information.
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//
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// Currently, when hoisting the instructions, we take the following actions:
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// - Remove their dbg.values.
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// - Set their debug locations to the values from the insertion point.
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//
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// As per PR39141 (comment #8), the more fundamental reason why the dbg.values
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// need to be deleted, is because there will not be any instructions with a
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// DILocation in either branch left after performing the transformation. We
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// can only insert a dbg.value after the two branches are joined again.
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//
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// See PR38762, PR39243 for more details.
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//
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// TODO: Extend llvm.dbg.value to take more than one SSA Value (PR39141) to
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// encode predicated DIExpressions that yield different results on different
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// code paths.
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for (BasicBlock::iterator II = BB->begin(), IE = BB->end(); II != IE;) {
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Instruction *I = &*II;
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I->dropUnknownNonDebugMetadata();
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if (I->isUsedByMetadata())
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dropDebugUsers(*I);
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if (isa<DbgVariableIntrinsic>(I)) {
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// Remove DbgInfo Intrinsics.
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II = I->eraseFromParent();
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continue;
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}
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I->setDebugLoc(InsertPt->getDebugLoc());
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++II;
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}
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DomBlock->getInstList().splice(InsertPt->getIterator(), BB->getInstList(),
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BB->begin(),
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BB->getTerminator()->getIterator());
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}
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namespace {
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/// A potential constituent of a bitreverse or bswap expression. See
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@ -2375,24 +2375,10 @@ static bool FoldTwoEntryPHINode(PHINode *PN, const TargetTransformInfo &TTI,
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// Move all 'aggressive' instructions, which are defined in the
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// conditional parts of the if's up to the dominating block.
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if (IfBlock1) {
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for (auto &I : *IfBlock1) {
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I.dropUnknownNonDebugMetadata();
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dropDebugUsers(I);
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}
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DomBlock->getInstList().splice(InsertPt->getIterator(),
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IfBlock1->getInstList(), IfBlock1->begin(),
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IfBlock1->getTerminator()->getIterator());
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}
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if (IfBlock2) {
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for (auto &I : *IfBlock2) {
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I.dropUnknownNonDebugMetadata();
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dropDebugUsers(I);
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}
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DomBlock->getInstList().splice(InsertPt->getIterator(),
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IfBlock2->getInstList(), IfBlock2->begin(),
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IfBlock2->getTerminator()->getIterator());
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}
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if (IfBlock1)
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hoistAllInstructionsInto(DomBlock, InsertPt, IfBlock1);
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if (IfBlock2)
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hoistAllInstructionsInto(DomBlock, InsertPt, IfBlock2);
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while (PHINode *PN = dyn_cast<PHINode>(BB->begin())) {
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// Change the PHI node into a select instruction.
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101
test/CodeGen/X86/pr38762.ll
Normal file
101
test/CodeGen/X86/pr38762.ll
Normal file
@ -0,0 +1,101 @@
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; RUN: opt < %s -S -simplifycfg | FileCheck %s
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; Note: This patch is a complement to pr38763.
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;
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; When SimplifyCFG changes the PHI node into a select instruction, the debug
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; information becomes ambiguous. It causes the debugger to display unreached
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; lines and invalid variable values.
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;
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; When in the debugger, on the line "if (read1 > 3)", and we step from the
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; 'if' condition, onto the addition, then back to the 'if' again, which is
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; misleading because that addition doesn't really "happen" (it's speculated).
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; IR generated with:
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; clang -S -g -gno-column-info -O2 -emit-llvm pr38762.cpp -o pr38762.ll -mllvm -opt-bisect-limit=10
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; // pr38762.cpp
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; int main() {
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; volatile int foo = 0;
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; int read1 = foo;
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; int brains = foo;
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;
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; if (read1 > 3) {
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; brains *= 2;
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; brains += 1;
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; }
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;
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; return brains;
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; }
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; Change the debug locations associated with the PHI nodes being promoted, to
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; the debug locations from the insertion point in the dominant block.
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; CHECK-LABEL: entry
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; CHECK: %cmp = icmp sgt i32 %foo.0., 3, !dbg !14
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; CHECK: %mul = shl nsw i32 %foo.0.5, 1, !dbg !16
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; CHECK-NOT: call void @llvm.dbg.value(metadata i32 %mul, metadata !15, metadata !DIExpression()), !dbg !25
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; CHECK: %add = or i32 %mul, 1, !dbg !16
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; CHECK-NOT: call void @llvm.dbg.value(metadata i32 %add, metadata !15, metadata !DIExpression()), !dbg !25
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; CHECK: %brains.0 = select i1 %cmp, i32 %add, i32 %foo.0.5, !dbg !16
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; ModuleID = 'pr38762.cpp'
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source_filename = "pr38762.cpp"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-linux-gnu"
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; Function Attrs: norecurse nounwind uwtable
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define dso_local i32 @main() local_unnamed_addr #0 !dbg !7 {
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entry:
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%foo = alloca i32, align 4
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%foo.0..sroa_cast = bitcast i32* %foo to i8*
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store volatile i32 0, i32* %foo, align 4
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%foo.0. = load volatile i32, i32* %foo, align 4
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%foo.0.5 = load volatile i32, i32* %foo, align 4
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call void @llvm.dbg.value(metadata i32 %foo.0.5, metadata !15, metadata !DIExpression()), !dbg !25
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%cmp = icmp sgt i32 %foo.0., 3, !dbg !26
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br i1 %cmp, label %if.then, label %if.end, !dbg !28
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if.then: ; preds = %entry
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%mul = shl nsw i32 %foo.0.5, 1, !dbg !29
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call void @llvm.dbg.value(metadata i32 %mul, metadata !15, metadata !DIExpression()), !dbg !25
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%add = or i32 %mul, 1, !dbg !31
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call void @llvm.dbg.value(metadata i32 %add, metadata !15, metadata !DIExpression()), !dbg !25
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br label %if.end, !dbg !32
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if.end: ; preds = %if.then, %entry
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%brains.0 = phi i32 [ %add, %if.then ], [ %foo.0.5, %entry ], !dbg !33
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call void @llvm.dbg.value(metadata i32 %brains.0, metadata !15, metadata !DIExpression()), !dbg !25
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ret i32 %brains.0, !dbg !35
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata) #2
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 8.0.0 (trunk 343753)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
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!1 = !DIFile(filename: "pr38762.cpp", directory: ".")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 8.0.0 (trunk 343753)"}
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!7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !11)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !{!15}
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!13 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !10)
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!15 = !DILocalVariable(name: "brains", scope: !7, file: !1, line: 4, type: !10)
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!25 = !DILocation(line: 4, scope: !7)
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!26 = !DILocation(line: 6, scope: !27)
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!27 = distinct !DILexicalBlock(scope: !7, file: !1, line: 6)
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!28 = !DILocation(line: 6, scope: !7)
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!29 = !DILocation(line: 7, scope: !30)
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!30 = distinct !DILexicalBlock(scope: !27, file: !1, line: 6)
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!31 = !DILocation(line: 8, scope: !30)
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!32 = !DILocation(line: 9, scope: !30)
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!33 = !DILocation(line: 0, scope: !7)
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!34 = !DILocation(line: 12, scope: !7)
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!35 = !DILocation(line: 11, scope: !7)
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@ -30,13 +30,13 @@
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; branches, as they becomes ambiguous.
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; CHECK-LABEL: entry
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; CHECK: %cmp = icmp eq i32 %foo.0., 4
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; CHECK: %add = add nsw i32 %foo.0.4, 2, !dbg !18
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; CHECK: %cmp = icmp eq i32 %foo.0., 4, !dbg !14
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; CHECK: %add = add nsw i32 %foo.0.4, 2, !dbg !16
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; CHECK-NOT: @llvm.dbg.value(metadata i32 %add
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; CHECK: %sub = add nsw i32 %foo.0.4, -2, !dbg !21
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; CHECK: %sub = add nsw i32 %foo.0.4, -2, !dbg !16
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; CHECK-NOT: @llvm.dbg.value(metadata i32 %sub
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; CHECK: %result.0 = select i1 %cmp, i32 %add, i32 %sub
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; CHECK: call void @llvm.dbg.value(metadata i32 %result.0, metadata !12, metadata !DIExpression()), !dbg !17
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; CHECK: call void @llvm.dbg.value(metadata i32 %result.0, metadata !12, metadata !DIExpression()), !dbg !13
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; ModuleID = 'pr38763.cpp'
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source_filename = "pr38763.cpp"
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@ -48,12 +48,12 @@ define dso_local i32 @main() local_unnamed_addr #0 !dbg !7 {
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entry:
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%foo = alloca i32, align 4
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%foo.0..sroa_cast = bitcast i32* %foo to i8*
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store volatile i32 4, i32* %foo, align 4, !tbaa !19
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store volatile i32 4, i32* %foo, align 4
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%foo.0. = load volatile i32, i32* %foo, align 4
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%foo.0.4 = load volatile i32, i32* %foo, align 4
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call void @llvm.dbg.value(metadata i32 0, metadata !16, metadata !DIExpression()), !dbg !27
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%cmp = icmp eq i32 %foo.0., 4
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br i1 %cmp, label %if.then, label %if.else
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%cmp = icmp eq i32 %foo.0., 4, !dbg !28
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br i1 %cmp, label %if.then, label %if.else, !dbg !30
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if.then: ; preds = %entry
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%add = add nsw i32 %foo.0.4, 2, !dbg !31
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@ -91,12 +91,10 @@ declare void @llvm.dbg.value(metadata, metadata, metadata) #2
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !{!16}
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!16 = !DILocalVariable(name: "result", scope: !7, file: !1, line: 6, type: !10)
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!19 = !{!20, !20, i64 0}
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!20 = !{!"int", !21, i64 0}
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!21 = !{!"omnipotent char", !22, i64 0}
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!22 = !{!"Simple C++ TBAA"}
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!27 = !DILocation(line: 6, column: 7, scope: !7)
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!28 = !DILocation(line: 7, column: 12, scope: !29)
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!29 = distinct !DILexicalBlock(scope: !7, file: !1, line: 7, column: 7)
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!30 = !DILocation(line: 7, column: 7, scope: !7)
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!31 = !DILocation(line: 8, column: 20, scope: !32)
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!32 = distinct !DILexicalBlock(scope: !29, file: !1, line: 7, column: 18)
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!34 = !DILocation(line: 10, column: 20, scope: !35)
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132
test/CodeGen/X86/pr39243.ll
Normal file
132
test/CodeGen/X86/pr39243.ll
Normal file
@ -0,0 +1,132 @@
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; RUN: opt < %s -S -simplifycfg | FileCheck %s
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; Note: This patch fixes the regression introduced by pr38762.
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;
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; When SimplifyCFG changes the PHI node into a select instruction, the debug
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; information becomes ambiguous. It causes the debugger to display unreached
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; lines and invalid variable values.
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;
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; When the function 'hoistAllInstructionsInto' hoist a basic block:
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; - Remove their dbg.values.
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; - Set their debug locations to the values from the insertion point.
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;
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; But, if one of the instructions being hoisted is a debug intrinsic from an
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; inlined function, assigning it the debug location from the insertion point
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; will create a mismatch between the intrinsic's subprogram and the location's
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; subprogram, causing the assertion "Expected inlined-at fields to agree" in
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; SelectionDAG".
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; IR generated with:
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; clang -S -g -gno-column-info -O2 -emit-llvm pr39243.cpp -o pr39243.ll -mllvm -opt-bisect-limit=103
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; // pr39243.cpp
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; union onion {
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; double dd;
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; int ii[2];
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; };
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;
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; int alpha;
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; int bravo();
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;
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; int charlie() {
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; int delta = 0;
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; return bravo();
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; }
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;
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; int echo(onion foxtrot) {
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; alpha = foxtrot.ii[0];
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; if (alpha) {
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; int golf = bravo();
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; return -golf;
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; }
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; alpha = foxtrot.ii[1];
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; return -charlie();
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; }
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; Change the debug locations associated with the PHI nodes being promoted, to
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; the debug locations from the insertion point in the dominant block.
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; CHECK-LABEL: entry
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; CHECK: %foxtrot.sroa.0.0.extract.trunc = trunc i64 %foxtrot.coerce to i32
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; CHECK: %tobool = icmp eq i32 %foxtrot.sroa.0.0.extract.trunc, 0
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; CHECK: %foxtrot.sroa.2.0.extract.shift = lshr i64 %foxtrot.coerce, 32
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; CHECK-NOT: call void @llvm.dbg.value(metadata i32 %foxtrot.sroa.2.0.extract.trunc, metadata !30, metadata !DIExpression(DW_OP_LLVM_fragment, 32, 32)), !dbg !34
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; CHECK: %foxtrot.sroa.2.0.extract.trunc = trunc i64 %foxtrot.sroa.2.0.extract.shift to i32
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; CHECK: store i32 %foxtrot.sroa.2.0.extract.trunc, i32* @alpha, align 4, !dbg !25
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; CHECK-NOT: call void @llvm.dbg.value(metadata i32 0, metadata !15, metadata !DIExpression()), !dbg !43
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; ModuleID = 'pr39243.cpp'
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source_filename = "pr39243.cpp"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-linux-gnu"
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@alpha = dso_local local_unnamed_addr global i32 0, align 4, !dbg !0
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define dso_local i32 @_Z7charliev() local_unnamed_addr #0 {
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entry:
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%call = tail call i32 @_Z5bravov()
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ret i32 %call
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}
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declare dso_local i32 @_Z5bravov() local_unnamed_addr #1
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define dso_local i32 @_Z4echo5onion(i64 %foxtrot.coerce) local_unnamed_addr #0 !dbg !18 {
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entry:
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%foxtrot.sroa.0.0.extract.trunc = trunc i64 %foxtrot.coerce to i32
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store i32 %foxtrot.sroa.0.0.extract.trunc, i32* @alpha, align 4
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%tobool = icmp eq i32 %foxtrot.sroa.0.0.extract.trunc, 0
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br i1 %tobool, label %if.end, label %return
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if.end: ; preds = %entry
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%foxtrot.sroa.2.0.extract.shift = lshr i64 %foxtrot.coerce, 32
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%foxtrot.sroa.2.0.extract.trunc = trunc i64 %foxtrot.sroa.2.0.extract.shift to i32
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call void @llvm.dbg.value(metadata i32 %foxtrot.sroa.2.0.extract.trunc, metadata !30, metadata !DIExpression(DW_OP_LLVM_fragment, 32, 32)), !dbg !34
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store i32 %foxtrot.sroa.2.0.extract.trunc, i32* @alpha, align 4, !dbg !42
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call void @llvm.dbg.value(metadata i32 0, metadata !15, metadata !DIExpression()), !dbg !43
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br label %return
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return: ; preds = %entry, %if.end
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%call.i = tail call i32 @_Z5bravov()
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%retval.0 = sub nsw i32 0, %call.i
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ret i32 %retval.0
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata) #2
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!7, !8, !9}
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!llvm.ident = !{!10}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "alpha", scope: !2, file: !3, line: 6, type: !6, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 8.0.0 (trunk 344502)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
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!3 = !DIFile(filename: "pr39243.cpp", directory: ".")
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!4 = !{}
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!5 = !{!0}
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!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
|
||||
!7 = !{i32 2, !"Dwarf Version", i32 4}
|
||||
!8 = !{i32 2, !"Debug Info Version", i32 3}
|
||||
!9 = !{i32 1, !"wchar_size", i32 4}
|
||||
!10 = !{!"clang version 8.0.0 (trunk 344502)"}
|
||||
!11 = distinct !DISubprogram(name: "charlie", linkageName: "_Z7charliev", scope: !3, file: !3, line: 9, type: !12, isLocal: false, isDefinition: true, scopeLine: 9, flags: DIFlagPrototyped, isOptimized: true, unit: !2, retainedNodes: !14)
|
||||
!12 = !DISubroutineType(types: !13)
|
||||
!13 = !{!6}
|
||||
!14 = !{!15}
|
||||
!15 = !DILocalVariable(name: "delta", scope: !11, file: !3, line: 10, type: !6)
|
||||
!18 = distinct !DISubprogram(name: "echo", linkageName: "_Z4echo5onion", scope: !3, file: !3, line: 14, type: !19, isLocal: false, isDefinition: true, scopeLine: 14, flags: DIFlagPrototyped, isOptimized: true, unit: !2, retainedNodes: !29)
|
||||
!19 = !DISubroutineType(types: !20)
|
||||
!20 = !{!6, !21}
|
||||
!21 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "onion", file: !3, line: 1, size: 64, flags: DIFlagTypePassByValue | DIFlagTrivial, elements: !22, identifier: "_ZTS5onion")
|
||||
!22 = !{!23, !25}
|
||||
!23 = !DIDerivedType(tag: DW_TAG_member, name: "dd", scope: !21, file: !3, line: 2, baseType: !24, size: 64)
|
||||
!24 = !DIBasicType(name: "double", size: 64, encoding: DW_ATE_float)
|
||||
!25 = !DIDerivedType(tag: DW_TAG_member, name: "ii", scope: !21, file: !3, line: 3, baseType: !26, size: 64)
|
||||
!26 = !DICompositeType(tag: DW_TAG_array_type, baseType: !6, size: 64, elements: !27)
|
||||
!27 = !{!28}
|
||||
!28 = !DISubrange(count: 2)
|
||||
!29 = !{!30}
|
||||
!30 = !DILocalVariable(name: "foxtrot", arg: 1, scope: !18, file: !3, line: 14, type: !21)
|
||||
!34 = !DILocation(line: 14, scope: !18)
|
||||
!42 = !DILocation(line: 20, scope: !18)
|
||||
!43 = !DILocation(line: 10, scope: !11, inlinedAt: !44)
|
||||
!44 = distinct !DILocation(line: 21, scope: !18)
|
||||
Loading…
Reference in New Issue
Block a user