[llvm] r345250 - [DebugInfo][Dexter] Unreachable line stepped onto after SimplifyCFG.
Carlos Alberto Enciso via llvm-commits
llvm-commits at lists.llvm.org
Mon Jan 28 06:35:13 PST 2019
Hi Mikael,
That case is a good finding. Great catch. Thanks for the test
case.
Your suggested change to drop all DbgInfoIntrinsic instead of
just DbgVariableIntrinsic, makes perfect sense.
I have applied that change to my local copy and all the test
seems to pass.
Do you want to submit that change or do you prefer if I do it.
Either way is fine with me.
Best regards,
Carlos
On Mon, Jan 28, 2019 at 9:12 AM Mikael Holmén <mikael.holmen at ericsson.com>
wrote:
> Hi Carlos,
>
> I've stumbled on a case where the verifier complains with this change.
> With
>
> opt -S -o - bbi-23595.ll -simplifycfg
>
> you get
>
> llvm.dbg.label intrinsic requires a !dbg attachment
> call void @llvm.dbg.label(metadata !1)
> label %entry
> i16 ()* @_Z7test_itv
> in function _Z7test_itv
> LLVM ERROR: Broken function found, compilation aborted!
>
> With -print-after-all:
>
> *** IR Dump After Simplify the CFG ***
> define i16 @_Z7test_itv() {
> entry:
> call void @llvm.dbg.label(metadata !1)
> %retval.0 = select i1 undef, i16 1, i16 0
> ret i16 0
> }
>
> So simplifycfg has dropped the !dbg from the dbg.label, but kept the
> instruction itself.
>
> Should perhaps
>
> + if (isa<DbgVariableIntrinsic>(I)) {
> + // Remove DbgInfo Intrinsics.
> + II = I->eraseFromParent();
> + continue;
> + }
>
> in llvm::hoistAllInstructionsInto drop all DbgInfoIntrinsic instead of
> just DbgVariableIntrinsic ?
>
> Regards,
> Mikael
>
>
> On 10/25/18 11:58 AM, Carlos Alberto Enciso via llvm-commits wrote:
> > Author: carlos.alberto.enciso
> > Date: Thu Oct 25 02:58:59 2018
> > New Revision: 345250
> >
> > URL: http://llvm.org/viewvc/llvm-project?rev=345250&view=rev
> > Log:
> > [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
> >
> > Added:
> > llvm/trunk/test/CodeGen/X86/pr38762.ll
> > llvm/trunk/test/CodeGen/X86/pr39243.ll
> > Modified:
> > llvm/trunk/include/llvm/Transforms/Utils/Local.h
> > llvm/trunk/lib/Transforms/Utils/Local.cpp
> > llvm/trunk/lib/Transforms/Utils/SimplifyCFG.cpp
> > llvm/trunk/test/CodeGen/X86/pr38763.ll
> >
> > Modified: llvm/trunk/include/llvm/Transforms/Utils/Local.h
> > URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Transforms/Utils/Local.h?rev=345250&r1=345249&r2=345250&view=diff
> >
> ==============================================================================
> > --- llvm/trunk/include/llvm/Transforms/Utils/Local.h (original)
> > +++ llvm/trunk/include/llvm/Transforms/Utils/Local.h Thu Oct 25 02:58:59
> 2018
> > @@ -446,6 +446,15 @@ void copyRangeMetadata(const DataLayout
> > /// Remove the debug intrinsic instructions for the given instruction.
> > void dropDebugUsers(Instruction &I);
> >
> > +/// Hoist all of the instructions in the \p IfBlock to the dominant
> block
> > +/// \p DomBlock, by moving its instructions to the insertion point \p
> InsertPt.
> > +///
> > +/// The moved instructions receive the insertion point debug location
> values
> > +/// (DILocations) and their debug intrinsic instructions (dbg.values)
> are
> > +/// removed.
> > +void hoistAllInstructionsInto(BasicBlock *DomBlock, Instruction
> *InsertPt,
> > + BasicBlock *BB);
> > +
> >
> //===----------------------------------------------------------------------===//
> > // Intrinsic pattern matching
> > //
> >
> > Modified: llvm/trunk/lib/Transforms/Utils/Local.cpp
> > URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Utils/Local.cpp?rev=345250&r1=345249&r2=345250&view=diff
> >
> ==============================================================================
> > --- llvm/trunk/lib/Transforms/Utils/Local.cpp (original)
> > +++ llvm/trunk/lib/Transforms/Utils/Local.cpp Thu Oct 25 02:58:59 2018
> > @@ -2529,6 +2529,47 @@ void llvm::dropDebugUsers(Instruction &I
> > DII->eraseFromParent();
> > }
> >
> > +void llvm::hoistAllInstructionsInto(BasicBlock *DomBlock, Instruction
> *InsertPt,
> > + BasicBlock *BB) {
> > + // Since we are moving the instructions out of its basic block, we do
> not
> > + // retain their original debug locations (DILocations) and debug
> intrinsic
> > + // instructions (dbg.values).
> > + //
> > + // Doing so would degrade the debugging experience and adversely
> affect the
> > + // accuracy of profiling information.
> > + //
> > + // Currently, when hoisting the instructions, we take the following
> actions:
> > + // - Remove their dbg.values.
> > + // - Set their debug locations to the values from the insertion point.
> > + //
> > + // As per PR39141 (comment #8), the more fundamental reason why the
> dbg.values
> > + // need to be deleted, is because there will not be any instructions
> with a
> > + // DILocation in either branch left after performing the
> transformation. We
> > + // can only insert a dbg.value after the two branches are joined
> again.
> > + //
> > + // See PR38762, PR39243 for more details.
> > + //
> > + // TODO: Extend llvm.dbg.value to take more than one SSA Value
> (PR39141) to
> > + // encode predicated DIExpressions that yield different results on
> different
> > + // code paths.
> > + for (BasicBlock::iterator II = BB->begin(), IE = BB->end(); II !=
> IE;) {
> > + Instruction *I = &*II;
> > + I->dropUnknownNonDebugMetadata();
> > + if (I->isUsedByMetadata())
> > + dropDebugUsers(*I);
> > + if (isa<DbgVariableIntrinsic>(I)) {
> > + // Remove DbgInfo Intrinsics.
> > + II = I->eraseFromParent();
> > + continue;
> > + }
> > + I->setDebugLoc(InsertPt->getDebugLoc());
> > + ++II;
> > + }
> > + DomBlock->getInstList().splice(InsertPt->getIterator(),
> BB->getInstList(),
> > + BB->begin(),
> > + BB->getTerminator()->getIterator());
> > +}
> > +
> > namespace {
> >
> > /// A potential constituent of a bitreverse or bswap expression. See
> >
> > Modified: llvm/trunk/lib/Transforms/Utils/SimplifyCFG.cpp
> > URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Utils/SimplifyCFG.cpp?rev=345250&r1=345249&r2=345250&view=diff
> >
> ==============================================================================
> > --- llvm/trunk/lib/Transforms/Utils/SimplifyCFG.cpp (original)
> > +++ llvm/trunk/lib/Transforms/Utils/SimplifyCFG.cpp Thu Oct 25 02:58:59
> 2018
> > @@ -2375,24 +2375,10 @@ static bool FoldTwoEntryPHINode(PHINode
> >
> > // Move all 'aggressive' instructions, which are defined in the
> > // conditional parts of the if's up to the dominating block.
> > - if (IfBlock1) {
> > - for (auto &I : *IfBlock1) {
> > - I.dropUnknownNonDebugMetadata();
> > - dropDebugUsers(I);
> > - }
> > - DomBlock->getInstList().splice(InsertPt->getIterator(),
> > - IfBlock1->getInstList(),
> IfBlock1->begin(),
> > -
> IfBlock1->getTerminator()->getIterator());
> > - }
> > - if (IfBlock2) {
> > - for (auto &I : *IfBlock2) {
> > - I.dropUnknownNonDebugMetadata();
> > - dropDebugUsers(I);
> > - }
> > - DomBlock->getInstList().splice(InsertPt->getIterator(),
> > - IfBlock2->getInstList(),
> IfBlock2->begin(),
> > -
> IfBlock2->getTerminator()->getIterator());
> > - }
> > + if (IfBlock1)
> > + hoistAllInstructionsInto(DomBlock, InsertPt, IfBlock1);
> > + if (IfBlock2)
> > + hoistAllInstructionsInto(DomBlock, InsertPt, IfBlock2);
> >
> > while (PHINode *PN = dyn_cast<PHINode>(BB->begin())) {
> > // Change the PHI node into a select instruction.
> >
> > Added: llvm/trunk/test/CodeGen/X86/pr38762.ll
> > URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/pr38762.ll?rev=345250&view=auto
> >
> ==============================================================================
> > --- llvm/trunk/test/CodeGen/X86/pr38762.ll (added)
> > +++ llvm/trunk/test/CodeGen/X86/pr38762.ll Thu Oct 25 02:58:59 2018
> > @@ -0,0 +1,101 @@
> > +; RUN: opt < %s -S -simplifycfg | FileCheck %s
> > +
> > +; Note: This patch is a complement to pr38763.
> > +;
> > +; When SimplifyCFG changes the PHI node into a select instruction, the
> debug
> > +; information becomes ambiguous. It causes the debugger to display
> unreached
> > +; lines and invalid variable values.
> > +;
> > +; When in the debugger, on the line "if (read1 > 3)", and we step from
> the
> > +; 'if' condition, onto the addition, then back to the 'if' again, which
> is
> > +; misleading because that addition doesn't really "happen" (it's
> speculated).
> > +
> > +; IR generated with:
> > +; clang -S -g -gno-column-info -O2 -emit-llvm pr38762.cpp -o pr38762.ll
> -mllvm -opt-bisect-limit=10
> > +
> > +; // pr38762.cpp
> > +; int main() {
> > +; volatile int foo = 0;
> > +; int read1 = foo;
> > +; int brains = foo;
> > +;
> > +; if (read1 > 3) {
> > +; brains *= 2;
> > +; brains += 1;
> > +; }
> > +;
> > +; return brains;
> > +; }
> > +
> > +; Change the debug locations associated with the PHI nodes being
> promoted, to
> > +; the debug locations from the insertion point in the dominant block.
> > +
> > +; CHECK-LABEL: entry
> > +; CHECK: %cmp = icmp sgt i32 %foo.0., 3, !dbg !14
> > +; CHECK: %mul = shl nsw i32 %foo.0.5, 1, !dbg !16
> > +; CHECK-NOT: call void @llvm.dbg.value(metadata i32 %mul, metadata
> !15, metadata !DIExpression()), !dbg !25
> > +; CHECK: %add = or i32 %mul, 1, !dbg !16
> > +; CHECK-NOT: call void @llvm.dbg.value(metadata i32 %add, metadata
> !15, metadata !DIExpression()), !dbg !25
> > +; CHECK: %brains.0 = select i1 %cmp, i32 %add, i32 %foo.0.5, !dbg !16
> > +
> > +; ModuleID = 'pr38762.cpp'
> > +source_filename = "pr38762.cpp"
> > +target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
> > +target triple = "x86_64-pc-linux-gnu"
> > +
> > +; Function Attrs: norecurse nounwind uwtable
> > +define dso_local i32 @main() local_unnamed_addr #0 !dbg !7 {
> > +entry:
> > + %foo = alloca i32, align 4
> > + %foo.0..sroa_cast = bitcast i32* %foo to i8*
> > + store volatile i32 0, i32* %foo, align 4
> > + %foo.0. = load volatile i32, i32* %foo, align 4
> > + %foo.0.5 = load volatile i32, i32* %foo, align 4
> > + call void @llvm.dbg.value(metadata i32 %foo.0.5, metadata !15,
> metadata !DIExpression()), !dbg !25
> > + %cmp = icmp sgt i32 %foo.0., 3, !dbg !26
> > + br i1 %cmp, label %if.then, label %if.end, !dbg !28
> > +
> > +if.then: ; preds = %entry
> > + %mul = shl nsw i32 %foo.0.5, 1, !dbg !29
> > + call void @llvm.dbg.value(metadata i32 %mul, metadata !15, metadata
> !DIExpression()), !dbg !25
> > + %add = or i32 %mul, 1, !dbg !31
> > + call void @llvm.dbg.value(metadata i32 %add, metadata !15, metadata
> !DIExpression()), !dbg !25
> > + br label %if.end, !dbg !32
> > +
> > +if.end: ; preds = %if.then,
> %entry
> > + %brains.0 = phi i32 [ %add, %if.then ], [ %foo.0.5, %entry ], !dbg !33
> > + call void @llvm.dbg.value(metadata i32 %brains.0, metadata !15,
> metadata !DIExpression()), !dbg !25
> > + ret i32 %brains.0, !dbg !35
> > +}
> > +
> > +declare void @llvm.dbg.value(metadata, metadata, metadata) #2
> > +
> > +!llvm.dbg.cu = !{!0}
> > +!llvm.module.flags = !{!3, !4, !5}
> > +!llvm.ident = !{!6}
> > +
> > +!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)
> > +!1 = !DIFile(filename: "pr38762.cpp", directory: ".")
> > +!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 8.0.0 (trunk 343753)"}
> > +!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)
> > +!8 = !DISubroutineType(types: !9)
> > +!9 = !{!10}
> > +!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
> > +!11 = !{!15}
> > +!13 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !10)
> > +!15 = !DILocalVariable(name: "brains", scope: !7, file: !1, line: 4,
> type: !10)
> > +!25 = !DILocation(line: 4, scope: !7)
> > +!26 = !DILocation(line: 6, scope: !27)
> > +!27 = distinct !DILexicalBlock(scope: !7, file: !1, line: 6)
> > +!28 = !DILocation(line: 6, scope: !7)
> > +!29 = !DILocation(line: 7, scope: !30)
> > +!30 = distinct !DILexicalBlock(scope: !27, file: !1, line: 6)
> > +!31 = !DILocation(line: 8, scope: !30)
> > +!32 = !DILocation(line: 9, scope: !30)
> > +!33 = !DILocation(line: 0, scope: !7)
> > +!34 = !DILocation(line: 12, scope: !7)
> > +!35 = !DILocation(line: 11, scope: !7)
> >
> > Modified: llvm/trunk/test/CodeGen/X86/pr38763.ll
> > URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/pr38763.ll?rev=345250&r1=345249&r2=345250&view=diff
> >
> ==============================================================================
> > --- llvm/trunk/test/CodeGen/X86/pr38763.ll (original)
> > +++ llvm/trunk/test/CodeGen/X86/pr38763.ll Thu Oct 25 02:58:59 2018
> > @@ -30,13 +30,13 @@
> > ; branches, as they becomes ambiguous.
> >
> > ; CHECK-LABEL: entry
> > -; CHECK: %cmp = icmp eq i32 %foo.0., 4
> > -; CHECK: %add = add nsw i32 %foo.0.4, 2, !dbg !18
> > +; CHECK: %cmp = icmp eq i32 %foo.0., 4, !dbg !14
> > +; CHECK: %add = add nsw i32 %foo.0.4, 2, !dbg !16
> > ; CHECK-NOT: @llvm.dbg.value(metadata i32 %add
> > -; CHECK: %sub = add nsw i32 %foo.0.4, -2, !dbg !21
> > +; CHECK: %sub = add nsw i32 %foo.0.4, -2, !dbg !16
> > ; CHECK-NOT: @llvm.dbg.value(metadata i32 %sub
> > ; CHECK: %result.0 = select i1 %cmp, i32 %add, i32 %sub
> > -; CHECK: call void @llvm.dbg.value(metadata i32 %result.0, metadata
> !12, metadata !DIExpression()), !dbg !17
> > +; CHECK: call void @llvm.dbg.value(metadata i32 %result.0, metadata
> !12, metadata !DIExpression()), !dbg !13
> >
> > ; ModuleID = 'pr38763.cpp'
> > source_filename = "pr38763.cpp"
> > @@ -48,12 +48,12 @@ define dso_local i32 @main() local_unnam
> > entry:
> > %foo = alloca i32, align 4
> > %foo.0..sroa_cast = bitcast i32* %foo to i8*
> > - store volatile i32 4, i32* %foo, align 4, !tbaa !19
> > + store volatile i32 4, i32* %foo, align 4
> > %foo.0. = load volatile i32, i32* %foo, align 4
> > %foo.0.4 = load volatile i32, i32* %foo, align 4
> > call void @llvm.dbg.value(metadata i32 0, metadata !16, metadata
> !DIExpression()), !dbg !27
> > - %cmp = icmp eq i32 %foo.0., 4
> > - br i1 %cmp, label %if.then, label %if.else
> > + %cmp = icmp eq i32 %foo.0., 4, !dbg !28
> > + br i1 %cmp, label %if.then, label %if.else, !dbg !30
> >
> > if.then: ; preds = %entry
> > %add = add nsw i32 %foo.0.4, 2, !dbg !31
> > @@ -91,12 +91,10 @@ declare void @llvm.dbg.value(metadata, m
> > !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
> > !11 = !{!16}
> > !16 = !DILocalVariable(name: "result", scope: !7, file: !1, line: 6,
> type: !10)
> > -!19 = !{!20, !20, i64 0}
> > -!20 = !{!"int", !21, i64 0}
> > -!21 = !{!"omnipotent char", !22, i64 0}
> > -!22 = !{!"Simple C++ TBAA"}
> > !27 = !DILocation(line: 6, column: 7, scope: !7)
> > +!28 = !DILocation(line: 7, column: 12, scope: !29)
> > !29 = distinct !DILexicalBlock(scope: !7, file: !1, line: 7, column: 7)
> > +!30 = !DILocation(line: 7, column: 7, scope: !7)
> > !31 = !DILocation(line: 8, column: 20, scope: !32)
> > !32 = distinct !DILexicalBlock(scope: !29, file: !1, line: 7, column:
> 18)
> > !34 = !DILocation(line: 10, column: 20, scope: !35)
> >
> > Added: llvm/trunk/test/CodeGen/X86/pr39243.ll
> > URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/pr39243.ll?rev=345250&view=auto
> >
> ==============================================================================
> > --- llvm/trunk/test/CodeGen/X86/pr39243.ll (added)
> > +++ llvm/trunk/test/CodeGen/X86/pr39243.ll Thu Oct 25 02:58:59 2018
> > @@ -0,0 +1,132 @@
> > +; RUN: opt < %s -S -simplifycfg | FileCheck %s
> > +
> > +; Note: This patch fixes the regression introduced by pr38762.
> > +;
> > +; When SimplifyCFG changes the PHI node into a select instruction, the
> debug
> > +; information becomes ambiguous. It causes the debugger to display
> unreached
> > +; lines and invalid variable values.
> > +;
> > +; When the function 'hoistAllInstructionsInto' hoist a basic block:
> > +; - Remove their dbg.values.
> > +; - Set their debug locations to the values from the insertion point.
> > +;
> > +; But, if one of the instructions being hoisted is a debug intrinsic
> from an
> > +; inlined function, assigning it the debug location from the insertion
> point
> > +; will create a mismatch between the intrinsic's subprogram and the
> location's
> > +; subprogram, causing the assertion "Expected inlined-at fields to
> agree" in
> > +; SelectionDAG".
> > +
> > +; IR generated with:
> > +; clang -S -g -gno-column-info -O2 -emit-llvm pr39243.cpp -o pr39243.ll
> -mllvm -opt-bisect-limit=103
> > +
> > +; // pr39243.cpp
> > +; union onion {
> > +; double dd;
> > +; int ii[2];
> > +; };
> > +;
> > +; int alpha;
> > +; int bravo();
> > +;
> > +; int charlie() {
> > +; int delta = 0;
> > +; return bravo();
> > +; }
> > +;
> > +; int echo(onion foxtrot) {
> > +; alpha = foxtrot.ii[0];
> > +; if (alpha) {
> > +; int golf = bravo();
> > +; return -golf;
> > +; }
> > +; alpha = foxtrot.ii[1];
> > +; return -charlie();
> > +; }
> > +
> > +; Change the debug locations associated with the PHI nodes being
> promoted, to
> > +; the debug locations from the insertion point in the dominant block.
> > +
> > +; CHECK-LABEL: entry
> > +; CHECK: %foxtrot.sroa.0.0.extract.trunc = trunc i64 %foxtrot.coerce
> to i32
> > +; CHECK: %tobool = icmp eq i32 %foxtrot.sroa.0.0.extract.trunc, 0
> > +; CHECK: %foxtrot.sroa.2.0.extract.shift = lshr i64 %foxtrot.coerce, 32
> > +; 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
> > +; CHECK: %foxtrot.sroa.2.0.extract.trunc = trunc i64
> %foxtrot.sroa.2.0.extract.shift to i32
> > +; CHECK: store i32 %foxtrot.sroa.2.0.extract.trunc, i32* @alpha, align
> 4, !dbg !25
> > +; CHECK-NOT: call void @llvm.dbg.value(metadata i32 0, metadata !15,
> metadata !DIExpression()), !dbg !43
> > +
> > +; ModuleID = 'pr39243.cpp'
> > +source_filename = "pr39243.cpp"
> > +target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
> > +target triple = "x86_64-pc-linux-gnu"
> > +
> > + at alpha = dso_local local_unnamed_addr global i32 0, align 4, !dbg !0
> > +
> > +define dso_local i32 @_Z7charliev() local_unnamed_addr #0 {
> > +entry:
> > + %call = tail call i32 @_Z5bravov()
> > + ret i32 %call
> > +}
> > +
> > +declare dso_local i32 @_Z5bravov() local_unnamed_addr #1
> > +
> > +define dso_local i32 @_Z4echo5onion(i64 %foxtrot.coerce)
> local_unnamed_addr #0 !dbg !18 {
> > +entry:
> > + %foxtrot.sroa.0.0.extract.trunc = trunc i64 %foxtrot.coerce to i32
> > + store i32 %foxtrot.sroa.0.0.extract.trunc, i32* @alpha, align 4
> > + %tobool = icmp eq i32 %foxtrot.sroa.0.0.extract.trunc, 0
> > + br i1 %tobool, label %if.end, label %return
> > +
> > +if.end: ; preds = %entry
> > + %foxtrot.sroa.2.0.extract.shift = lshr i64 %foxtrot.coerce, 32
> > + %foxtrot.sroa.2.0.extract.trunc = trunc i64
> %foxtrot.sroa.2.0.extract.shift to i32
> > + 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
> > + store i32 %foxtrot.sroa.2.0.extract.trunc, i32* @alpha, align 4, !dbg
> !42
> > + call void @llvm.dbg.value(metadata i32 0, metadata !15, metadata
> !DIExpression()), !dbg !43
> > + br label %return
> > +
> > +return: ; preds = %entry,
> %if.end
> > + %call.i = tail call i32 @_Z5bravov()
> > + %retval.0 = sub nsw i32 0, %call.i
> > + ret i32 %retval.0
> > +}
> > +
> > +declare void @llvm.dbg.value(metadata, metadata, metadata) #2
> > +
> > +!llvm.dbg.cu = !{!2}
> > +!llvm.module.flags = !{!7, !8, !9}
> > +!llvm.ident = !{!10}
> > +
> > +!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
> > +!1 = distinct !DIGlobalVariable(name: "alpha", scope: !2, file: !3,
> line: 6, type: !6, isLocal: false, isDefinition: true)
> > +!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)
> > +!3 = !DIFile(filename: "pr39243.cpp", directory: ".")
> > +!4 = !{}
> > +!5 = !{!0}
> > +!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)
> >
> >
> > _______________________________________________
> > llvm-commits mailing list
> > llvm-commits at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits
> >
>
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