[llvm] r305599 - Improve the accuracy of variable ranges .debug_loc location lists.

David Blaikie via llvm-commits llvm-commits at lists.llvm.org
Tue Jun 20 13:03:24 PDT 2017


Here's creduce's result. I'll do some manual reduction as well.

On Tue, Jun 20, 2017 at 10:24 AM David Blaikie <dblaikie at gmail.com> wrote:

> On Tue, Jun 20, 2017 at 8:51 AM Adrian Prantl <aprantl at apple.com> wrote:
>
>> On Jun 20, 2017, at 8:38 AM, David Blaikie <dblaikie at gmail.com> wrote:
>>
>>
>>
>> On Fri, Jun 16, 2017 at 3:40 PM Adrian Prantl via llvm-commits <
>> llvm-commits at lists.llvm.org> wrote:
>>
>>> Author: adrian
>>> Date: Fri Jun 16 17:40:04 2017
>>> New Revision: 305599
>>>
>>> URL: http://llvm.org/viewvc/llvm-project?rev=305599&view=rev
>>> Log:
>>> Improve the accuracy of variable ranges .debug_loc location lists.
>>>
>>> For the following motivating example
>>>   bool c();
>>>   void f();
>>>   bool start() {
>>>     bool result = c();
>>>     if (!c()) {
>>>       result = false;
>>>       goto exit;
>>>     }
>>>     f();
>>>     result = true;
>>>   exit:
>>>     return result;
>>>   }
>>>
>>> we would previously generate a single DW_AT_const_value(1) because
>>> only the DBG_VALUE in the second-to-last basic block survived
>>> codegen. This patch improves the heuristic used to determine when a
>>> DBG_VALUE is available at the beginning of its variable's enclosing
>>> lexical scope:
>>>
>>> - Stop giving singular constants blanket permission to take over the
>>>   entire scope. There is still a special case for constants in the
>>>   function prologue that we also miight want to retire later.
>>>
>>> - Use the lexical scope information to determine available-at-entry
>>>   instead of proximity to the function prologue.
>>>
>>> After this patch we generate a location list with a more accurate
>>> narrower availability for the constant true value. As a pleasant side
>>> effect, we also generate inline locations instead of location lists
>>> where a loacation covers the entire range of the enclosing lexical
>>> scope.
>>>
>>> Measured on compiling llc with four targets this doesn't have an
>>> effect on compile time and reduces the size of the debug info for llc
>>> by ~600K.
>>>
>>> rdar://problem/30286912
>>>
>>> Added:
>>>     llvm/trunk/test/DebugInfo/Generic/partial-constant.ll
>>> Modified:
>>>     llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
>>>     llvm/trunk/test/DebugInfo/Generic/sugared-constants.ll
>>>     llvm/trunk/test/DebugInfo/MIR/X86/bit-piece-dh.mir
>>>     llvm/trunk/test/DebugInfo/X86/dbg-merge-loc-entry.ll
>>>     llvm/trunk/test/DebugInfo/X86/inlined-formal-parameter.ll
>>>     llvm/trunk/test/DebugInfo/X86/parameters.ll
>>>     llvm/trunk/test/DebugInfo/X86/pieces-3.ll
>>>     llvm/trunk/test/DebugInfo/X86/reference-argument.ll
>>>     llvm/trunk/test/DebugInfo/X86/this-stack_value.ll
>>>
>>> Modified: llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
>>> URL:
>>> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp?rev=305599&r1=305598&r2=305599&view=diff
>>>
>>> ==============================================================================
>>> --- llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp (original)
>>> +++ llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp Fri Jun 16 17:40:04
>>> 2017
>>> @@ -972,16 +972,60 @@ DbgVariable *DwarfDebug::createConcreteV
>>>    return ConcreteVariables.back().get();
>>>  }
>>>
>>> -// Determine whether this DBG_VALUE is valid at the beginning of the
>>> function.
>>> -static bool validAtEntry(const MachineInstr *MInsn) {
>>> -  auto MBB = MInsn->getParent();
>>> -  // Is it in the entry basic block?
>>> -  if (!MBB->pred_empty())
>>> +/// Determine whether a *singular* DBG_VALUE is valid for the entirety
>>> of its
>>> +/// enclosing lexical scope. The check ensures there are no other
>>> instructions
>>> +/// in the same lexical scope preceding the DBG_VALUE and that its
>>> range is
>>> +/// either open or otherwise rolls off the end of the scope.
>>> +static bool validThroughout(LexicalScopes &LScopes,
>>> +                            const MachineInstr *DbgValue,
>>> +                            const MachineInstr *RangeEnd) {
>>> +  assert(DbgValue->getDebugLoc() && "DBG_VALUE without a debug
>>> location");
>>> +  auto MBB = DbgValue->getParent();
>>> +  auto DL = DbgValue->getDebugLoc();
>>> +  auto *LScope = LScopes.findLexicalScope(DL);
>>> +  // Scope doesn't exist; this is a dead DBG_VALUE.
>>> +  if (!LScope)
>>>      return false;
>>> -  for (MachineBasicBlock::const_reverse_iterator I(MInsn); I !=
>>> MBB->rend(); ++I)
>>> -    if (!(I->isDebugValue() || I->getFlag(MachineInstr::FrameSetup)))
>>> +  auto &LSRange = LScope->getRanges();
>>> +  if (LSRange.size() == 0)
>>> +    return false;
>>> +
>>> +  // Determine if the DBG_VALUE is valid at the beginning of its
>>> lexical block.
>>> +  const MachineInstr *LScopeBegin = LSRange.front().first;
>>> +  // Early exit if the lexical scope begins outside of the current
>>> block.
>>> +  if (LScopeBegin->getParent() != MBB)
>>> +    return false;
>>> +  MachineBasicBlock::const_reverse_iterator Pred(DbgValue);
>>> +  for (++Pred; Pred != MBB->rend(); ++Pred) {
>>> +    if (Pred->getFlag(MachineInstr::FrameSetup))
>>> +      break;
>>> +    auto PredDL = Pred->getDebugLoc();
>>> +    if (!PredDL || Pred->isDebugValue())
>>> +      continue;
>>> +    // Check whether the instruction preceding the DBG_VALUE is in the
>>> same
>>> +    // (sub)scope as the DBG_VALUE.
>>> +    if (DL->getScope() == PredDL->getScope() ||
>>> +        LScope->dominates(LScopes.findLexicalScope(PredDL)))
>>>
>>
>> Just a heads up, Google internal test infrastructure is seeing failures
>> here ^ (well, inside 'dominates' actually) when findLexicalScope returns
>> null on this line.
>>
>> The repro clang cc1 command is:
>>
>> clang-tot -cc1 -triple aarch64-linux-gnu -emit-obj  -relaxed-aliasing
>> -debug-info-kind=limited    -O2 -w -std=gnu++11 -o /tmp/x.o -x c++
>> crash.ii
>>
>> Though I don't have a public reduced test case yet - creduce uis working
>> on it (~75% reduced overnight... but chugging along pretty slow now). I'll
>> provide it when I've got something.
>>
>>
>> Thanks for the heads-up.! I'm assuming that
>>
>> *diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
>> b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp*
>> *index d392e372863..0830c78b6ed 100644*
>> *--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp*
>> *+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp*
>> @@ -1004,8 +1004,10 @@ static bool validThroughout(LexicalScopes
>> &LScopes,
>>        continue;
>>      // Check whether the instruction preceding the DBG_VALUE is in the
>> same
>>      // (sub)scope as the DBG_VALUE.
>> -    if (DL->getScope() == PredDL->getScope() ||
>> -        LScope->dominates(LScopes.findLexicalScope(PredDL)))
>> +    if (DL->getScope() == PredDL->getScope())
>> +      return false;
>> +    auto *PredScope = LScopes.findLexicalScope(PredDL);
>> +    if (!PredScope || LScope->dominates(PredScope))
>>        return false;
>>    }
>>
>> fixes the crash?
>>
>
> Haven't tried - I'd guess that'd probably silence the issue.
>
>
>> This just adds a defensive check for nullptr here and add a safe 'return
>> false' but I would like to understand how this is possible since we should
>> have visited the previous scope before.
>>
>
> Yeah, that'd be my concern - making sure the fix is principled.
>
>
>> I assume that the previous instruction's scope has no variable in it?
>>
>
> Haven't looked yet - just reducing for now.
>
> - Dave
>
>
>>
>> -- adrian
>>
>> I mention it now in case you're seeing similar things or want to
>> pre-emptively revert to avoid the possibility.
>>
>>
>>>        return false;
>>> -  return true;
>>> +  }
>>> +
>>> +  // If the range of the DBG_VALUE is open-ended, report success.
>>> +  if (!RangeEnd)
>>> +    return true;
>>> +
>>> +  // Fail if there are instructions belonging to our scope in another
>>> block.
>>> +  const MachineInstr *LScopeEnd = LSRange.back().second;
>>> +  if (LScopeEnd->getParent() != MBB)
>>> +    return false;
>>> +
>>> +  // Single, constant DBG_VALUEs in the prologue are promoted to be live
>>> +  // throughout the function. This is a hack, presumably for DWARF v2
>>> and not
>>> +  // necessarily correct. It would be much better to use a dbg.declare
>>> instead
>>> +  // if we know the constant is live throughout the scope.
>>> +  if (DbgValue->getOperand(0).isImm() && MBB->pred_empty())
>>> +    return true;
>>> +
>>> +  return false;
>>>  }
>>>
>>>  // Find variables for each lexical scope.
>>> @@ -1016,11 +1060,9 @@ void DwarfDebug::collectVariableInfo(Dwa
>>>      const MachineInstr *MInsn = Ranges.front().first;
>>>      assert(MInsn->isDebugValue() && "History must begin with debug
>>> value");
>>>
>>> -    // Check if there is a single DBG_VALUE, valid throughout the
>>> function.
>>> -    // A single constant is also considered valid for the entire
>>> function.
>>> +    // Check if there is a single DBG_VALUE, valid throughout the var's
>>> scope.
>>>      if (Ranges.size() == 1 &&
>>> -        (MInsn->getOperand(0).isImm() ||
>>> -         (validAtEntry(MInsn) && Ranges.front().second == nullptr))) {
>>> +        validThroughout(LScopes, MInsn, Ranges.front().second)) {
>>>        RegVar->initializeDbgValue(MInsn);
>>>        continue;
>>>      }
>>>
>>> Added: llvm/trunk/test/DebugInfo/Generic/partial-constant.ll
>>> URL:
>>> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/Generic/partial-constant.ll?rev=305599&view=auto
>>>
>>> ==============================================================================
>>> --- llvm/trunk/test/DebugInfo/Generic/partial-constant.ll (added)
>>> +++ llvm/trunk/test/DebugInfo/Generic/partial-constant.ll Fri Jun 16
>>> 17:40:04 2017
>>> @@ -0,0 +1,82 @@
>>> +; RUN: %llc_dwarf -filetype=obj < %s | llvm-dwarfdump - | FileCheck %s
>>> +; Generated at -O2 from:
>>> +; bool c();
>>> +; void f();
>>> +; bool start() {
>>> +;   bool result = c();
>>> +;   if (!c()) {
>>> +;     result = false;
>>> +;     goto exit;
>>> +;   }
>>> +;   f();
>>> +;   result = true;
>>> +; exit:
>>> +;   return result;
>>> +; }
>>> +;
>>> +; The constant should NOT be available for the entire function.
>>> +; CHECK-NOT: DW_AT_const_value
>>> +; CHECK: .debug_loc
>>> +; CHECK: Location description: 10 01 9f
>>> +;                              constu 0x00000001, stack-value
>>> +source_filename = "test.ii"
>>> +target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
>>> +target triple = "x86_64-apple-macosx10.12.0"
>>> +
>>> +; Function Attrs: noimplicitfloat noredzone nounwind optsize
>>> +define zeroext i1 @_Z5startv() local_unnamed_addr #0 !dbg !7 {
>>> +entry:
>>> +  %call = tail call zeroext i1 @_Z1cv() #3, !dbg !13
>>> +  %call1 = tail call zeroext i1 @_Z1cv() #3, !dbg !14
>>> +  br i1 %call1, label %if.end, label %exit, !dbg !16
>>> +
>>> +if.end:                                           ; preds = %entry
>>> +  tail call void @_Z1fv() #3, !dbg !17
>>> +  tail call void @llvm.dbg.value(metadata i8 1, i64 0, metadata !12,
>>> metadata !18), !dbg !19
>>> +  br label %exit, !dbg !20
>>> +
>>> +exit:                                             ; preds = %entry,
>>> %if.end
>>> +  %result.0 = phi i1 [ true, %if.end ], [ false, %entry ]
>>> +  ret i1 %result.0, !dbg !21
>>> +}
>>> +
>>> +; Function Attrs: noimplicitfloat noredzone optsize
>>> +declare zeroext i1 @_Z1cv() local_unnamed_addr #1
>>> +
>>> +; Function Attrs: noimplicitfloat noredzone optsize
>>> +declare void @_Z1fv() local_unnamed_addr #1
>>> +
>>> +; Function Attrs: nounwind readnone speculatable
>>> +declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
>>> +
>>> +attributes #0 = { noimplicitfloat noredzone nounwind optsize }
>>> +attributes #1 = { noimplicitfloat noredzone optsize }
>>> +attributes #2 = { nounwind readnone speculatable }
>>> +attributes #3 = { nobuiltin noimplicitfloat noredzone nounwind optsize }
>>> +
>>> +!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 5.0.0 (trunk 303873) (llvm/trunk 303897)",
>>> isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
>>> +!1 = !DIFile(filename: "test.ii", 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 5.0.0 (trunk 303873) (llvm/trunk 303897)"}
>>> +!7 = distinct !DISubprogram(name: "start", linkageName: "_Z5startv",
>>> scope: !1, file: !1, line: 3, type: !8, isLocal: false, isDefinition: true,
>>> scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0,
>>> variables: !11)
>>> +!8 = !DISubroutineType(types: !9)
>>> +!9 = !{!10}
>>> +!10 = !DIBasicType(name: "bool", size: 8, encoding: DW_ATE_boolean)
>>> +!11 = !{!12}
>>> +!12 = !DILocalVariable(name: "result", scope: !7, file: !1, line: 4,
>>> type: !10)
>>> +!13 = !DILocation(line: 4, column: 17, scope: !7)
>>> +!14 = !DILocation(line: 5, column: 8, scope: !15)
>>> +!15 = distinct !DILexicalBlock(scope: !7, file: !1, line: 5, column: 7)
>>> +!16 = !DILocation(line: 5, column: 7, scope: !7)
>>> +!17 = !DILocation(line: 9, column: 3, scope: !7)
>>> +!18 = !DIExpression()
>>> +!19 = !DILocation(line: 4, column: 8, scope: !7)
>>> +!20 = !DILocation(line: 10, column: 3, scope: !7)
>>> +!21 = !DILocation(line: 12, column: 3, scope: !7)
>>>
>>> Modified: llvm/trunk/test/DebugInfo/Generic/sugared-constants.ll
>>> URL:
>>> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/Generic/sugared-constants.ll?rev=305599&r1=305598&r2=305599&view=diff
>>>
>>> ==============================================================================
>>> --- llvm/trunk/test/DebugInfo/Generic/sugared-constants.ll (original)
>>> +++ llvm/trunk/test/DebugInfo/Generic/sugared-constants.ll Fri Jun 16
>>> 17:40:04 2017
>>> @@ -3,47 +3,23 @@
>>>  ; RUN: %llc_dwarf -O0 -filetype=obj %s -o - | llvm-dwarfdump
>>> -debug-dump=info - | FileCheck %s
>>>  ; Use correct signedness when emitting constants of derived (sugared)
>>> types.
>>>
>>> -; Test compiled to IR from clang with -O1 and the following source:
>>> -
>>> -; void func(int);
>>> -; void func(unsigned);
>>> -; void func(char16_t);
>>> -; int main() {
>>> -;   const int i = 42;
>>> -;   func(i);
>>> -;   const unsigned j = 117;
>>> -;   func(j);
>>> -;   char16_t c = 7;
>>> -;   func(c);
>>> -; }
>>> -
>>>  ; CHECK: DW_AT_const_value [DW_FORM_sdata] (42)
>>>  ; CHECK: DW_AT_const_value [DW_FORM_udata] (117)
>>>  ; CHECK: DW_AT_const_value [DW_FORM_udata] (7)
>>>
>>>  ; Function Attrs: uwtable
>>> -define i32 @main() #0 !dbg !4 {
>>> +define void @main() #0 !dbg !4 {
>>>  entry:
>>>    tail call void @llvm.dbg.value(metadata i32 42, i64 0, metadata !10,
>>> metadata !DIExpression()), !dbg !21
>>> -  tail call void @_Z4funci(i32 42), !dbg !22
>>>    tail call void @llvm.dbg.value(metadata i32 117, i64 0, metadata !12,
>>> metadata !DIExpression()), !dbg !24
>>> -  tail call void @_Z4funcj(i32 117), !dbg !25
>>>    tail call void @llvm.dbg.value(metadata i16 7, i64 0, metadata !15,
>>> metadata !DIExpression()), !dbg !27
>>> -  tail call void @_Z4funcDs(i16 zeroext 7), !dbg !28
>>> -  ret i32 0, !dbg !29
>>> +  ret void, !dbg !29
>>>  }
>>>
>>> -declare void @_Z4funci(i32) #1
>>> -
>>> -declare void @_Z4funcj(i32) #1
>>> -
>>> -declare void @_Z4funcDs(i16 zeroext) #1
>>> -
>>>  ; Function Attrs: nounwind readnone
>>>  declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
>>>
>>> -attributes #0 = { uwtable "less-precise-fpmad"="false"
>>> "no-frame-pointer-elim"="false" "no-infs-fp-math"="false"
>>> "no-nans-fp-math"="false" "stack-protector-buffer-size"="8"
>>> "unsafe-fp-math"="false" "use-soft-float"="false" }
>>> -attributes #1 = { "less-precise-fpmad"="false"
>>> "no-frame-pointer-elim"="false" "no-infs-fp-math"="false"
>>> "no-nans-fp-math"="false" "stack-protector-buffer-size"="8"
>>> "unsafe-fp-math"="false" "use-soft-float"="false" }
>>> +attributes #0 = { uwtable }
>>>  attributes #2 = { nounwind readnone }
>>>
>>>  !llvm.dbg.cu = !{!0}
>>>
>>> Modified: llvm/trunk/test/DebugInfo/MIR/X86/bit-piece-dh.mir
>>> URL:
>>> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/MIR/X86/bit-piece-dh.mir?rev=305599&r1=305598&r2=305599&view=diff
>>>
>>> ==============================================================================
>>> --- llvm/trunk/test/DebugInfo/MIR/X86/bit-piece-dh.mir (original)
>>> +++ llvm/trunk/test/DebugInfo/MIR/X86/bit-piece-dh.mir Fri Jun 16
>>> 17:40:04 2017
>>> @@ -1,13 +1,9 @@
>>> -# RUN: llc -filetype=obj -o - %s | llvm-dwarfdump - | FileCheck %s
>>> +# RUN: llc -filetype=obj -o - %s | llvm-dwarfdump --debug-dump=info - |
>>> FileCheck %s
>>>  # CHECK: .debug_info contents:
>>>  # CHECK: DW_TAG_variable
>>> -# CHECK-NEXT: DW_AT_location [DW_FORM_sec_offset]      ([[OFS:.*]])
>>> -# CHECK-NEXT: DW_AT_name {{.*}}"dh"
>>> -# CHECK: .debug_loc contents:
>>> -# CHECK: [[OFS]]: Beginning address offset: 0x0000000000000002
>>> -# CHECK:             Ending address offset: 0x000000000000000c
>>> -# CHECK:              Location description: 51 9d 08 08
>>>  #                                           rdx, bit-piece 8 8
>>> +# CHECK-NEXT: DW_AT_location {{.*}}         51 9d 08 08
>>> +# CHECK-NEXT: DW_AT_name {{.*}}"dh"
>>>  --- |
>>>    ; Manually created after:
>>>    ; char f(int i) {
>>>
>>> Modified: llvm/trunk/test/DebugInfo/X86/dbg-merge-loc-entry.ll
>>> URL:
>>> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/X86/dbg-merge-loc-entry.ll?rev=305599&r1=305598&r2=305599&view=diff
>>>
>>> ==============================================================================
>>> --- llvm/trunk/test/DebugInfo/X86/dbg-merge-loc-entry.ll (original)
>>> +++ llvm/trunk/test/DebugInfo/X86/dbg-merge-loc-entry.ll Fri Jun 16
>>> 17:40:04 2017
>>> @@ -6,6 +6,7 @@
>>>  target datalayout =
>>> "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
>>>  target triple = "x86_64-apple-darwin8"
>>>
>>> +; Test that consecutive, identical DBG_VALUEs are merged.
>>>  ;CHECK: DW_AT_location{{.*}}(<0x1> 55 )
>>>
>>>  %0 = type { i64, i1 }
>>> @@ -19,6 +20,7 @@ entry:
>>>    br i1 undef, label %bb2, label %bb4, !dbg !22
>>>
>>>  bb2:                                              ; preds = %entry
>>> +  tail call void @llvm.dbg.value(metadata i128 %u, i64 0, metadata !14,
>>> metadata !DIExpression()), !dbg !15
>>>    br label %bb4, !dbg !23
>>>
>>>  bb4:                                              ; preds = %bb2, %entry
>>>
>>> Modified: llvm/trunk/test/DebugInfo/X86/inlined-formal-parameter.ll
>>> URL:
>>> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/X86/inlined-formal-parameter.ll?rev=305599&r1=305598&r2=305599&view=diff
>>>
>>> ==============================================================================
>>> --- llvm/trunk/test/DebugInfo/X86/inlined-formal-parameter.ll (original)
>>> +++ llvm/trunk/test/DebugInfo/X86/inlined-formal-parameter.ll Fri Jun 16
>>> 17:40:04 2017
>>> @@ -1,5 +1,5 @@
>>>  ; RUN: llc -filetype=obj -o %t.o %s
>>> -; RUN: llvm-dwarfdump -debug-dump=info %t.o | FileCheck %s
>>> +; RUN: llvm-dwarfdump %t.o | FileCheck %s
>>>
>>>  ; Testcase generated using 'clang -g -O2 -S -emit-llvm' from the
>>> following:
>>>  ;; void sink(void);
>>> @@ -10,6 +10,7 @@
>>>  ;; }
>>>
>>>  ; Check that we have formal parameters for 'a' in both inlined
>>> subroutines.
>>> +; CHECK: .debug_info
>>>  ; CHECK:       DW_TAG_inlined_subroutine
>>>  ; CHECK-NEXT:    DW_AT_abstract_origin {{.*}} "bar"
>>>  ; CHECK:         DW_TAG_formal_parameter
>>> @@ -18,9 +19,11 @@
>>>  ; CHECK:       DW_TAG_inlined_subroutine
>>>  ; CHECK-NEXT:    DW_AT_abstract_origin {{.*}} "bar"
>>>  ; CHECK:         DW_TAG_formal_parameter
>>> -; CHECK-NEXT:      DW_AT_const_value
>>> +; CHECK-NEXT:      DW_AT_location [DW_FORM_data4]      (0x00000000)
>>>  ; CHECK-NEXT:      DW_AT_abstract_origin {{.*}} "a"
>>> -
>>> +;
>>> +; CHECK: .debug_loc
>>> +; CHECK: Location description: 11 00
>>>  target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
>>>  target triple = "x86_64-apple-darwin"
>>>
>>> @@ -34,13 +37,12 @@ entry:
>>>    ret void, !dbg !24
>>>  }
>>>
>>> -declare void @sink() #1
>>> +declare void @sink()
>>>
>>>  ; Function Attrs: nounwind readnone
>>>  declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
>>>
>>> -attributes #0 = { nounwind ssp uwtable "less-precise-fpmad"="false"
>>> "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"
>>> "no-infs-fp-math"="false" "no-nans-fp-math"="false"
>>> "stack-protector-buffer-size"="8" "target-cpu"="core2"
>>> "unsafe-fp-math"="false" "use-soft-float"="false" }
>>> -attributes #1 = { "less-precise-fpmad"="false"
>>> "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"
>>> "no-infs-fp-math"="false" "no-nans-fp-math"="false"
>>> "stack-protector-buffer-size"="8" "target-cpu"="core2"
>>> "unsafe-fp-math"="false" "use-soft-float"="false" }
>>> +attributes #0 = { nounwind ssp uwtable  }
>>>  attributes #2 = { nounwind readnone }
>>>  attributes #3 = { nounwind }
>>>
>>>
>>> Modified: llvm/trunk/test/DebugInfo/X86/parameters.ll
>>> URL:
>>> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/X86/parameters.ll?rev=305599&r1=305598&r2=305599&view=diff
>>>
>>> ==============================================================================
>>> --- llvm/trunk/test/DebugInfo/X86/parameters.ll (original)
>>> +++ llvm/trunk/test/DebugInfo/X86/parameters.ll Fri Jun 16 17:40:04 2017
>>> @@ -24,8 +24,9 @@
>>>
>>>  ; CHECK: debug_info contents
>>>  ; 0x74 is DW_OP_breg4, showing that the parameter is accessed indirectly
>>> -; (with a zero offset) from the register parameter
>>> -; CHECK: DW_AT_location [DW_FORM_data4]        ([[F_LOC:0x[0-9]*]])
>>> +; (with a zero offset) from the register parameter.
>>> +; CHECK: DW_AT_location {{.*}} 74 00 06
>>> +
>>>  ; CHECK-NOT: DW_TAG
>>>  ; CHECK: DW_AT_name{{.*}} = "f"
>>>  ;
>>> @@ -34,9 +35,6 @@
>>>  ; CHECK: DW_AT_name{{.*}} = "g"
>>>  ;
>>>  ; CHECK: debug_loc contents
>>> -; CHECK:         [[F_LOC]]: Beginning
>>> -; CHECK-NEXT:               Ending
>>> -; CHECK-NEXT: Location description: 74 00
>>>  ; CHECK:         [[G_LOC]]: Beginning
>>>  ; CHECK-NEXT:               Ending
>>>  ; CHECK-NEXT: Location description: 74 00
>>> @@ -77,11 +75,10 @@ if.end:
>>>    ret void, !dbg !32
>>>  }
>>>
>>> -declare void @_ZN7pr147634sinkEPv(i8*) #2
>>> +declare void @_ZN7pr147634sinkEPv(i8*)
>>>
>>> -attributes #0 = { uwtable "less-precise-fpmad"="false"
>>> "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"="true"
>>> "no-infs-fp-math"="false" "no-nans-fp-math"="false"
>>> "unsafe-fp-math"="false" "use-soft-float"="false" }
>>> +attributes #0 = { uwtable }
>>>  attributes #1 = { nounwind readnone }
>>> -attributes #2 = { "less-precise-fpmad"="false"
>>> "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"="true"
>>> "no-infs-fp-math"="false" "no-nans-fp-math"="false"
>>> "unsafe-fp-math"="false" "use-soft-float"="false" }
>>>
>>>  !llvm.dbg.cu = !{!0}
>>>  !llvm.module.flags = !{!21, !33}
>>>
>>> Modified: llvm/trunk/test/DebugInfo/X86/pieces-3.ll
>>> URL:
>>> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/X86/pieces-3.ll?rev=305599&r1=305598&r2=305599&view=diff
>>>
>>> ==============================================================================
>>> --- llvm/trunk/test/DebugInfo/X86/pieces-3.ll (original)
>>> +++ llvm/trunk/test/DebugInfo/X86/pieces-3.ll Fri Jun 16 17:40:04 2017
>>> @@ -19,7 +19,9 @@
>>>  ; CHECK-NEXT:   DW_AT_location [DW_FORM_data4]        ([[LOC1:.*]])
>>>  ; CHECK-NEXT:   DW_AT_name {{.*}}"outer"
>>>  ; CHECK: DW_TAG_variable
>>> -; CHECK-NEXT:   DW_AT_location [DW_FORM_data4]        ([[LOC2:.*]])
>>> +; CHECK-NEXT:   DW_AT_location
>>> +;                                     rsi, piece 0x00000004
>>> +; CHECK-SAME:                         54 93 04
>>>  ; CHECK-NEXT:   "i1"
>>>  ;
>>>  ; CHECK: .debug_loc
>>> @@ -32,10 +34,6 @@
>>>  ; CHECK:           Beginning address offset: 0x0000000000000004
>>>  ; CHECK-NEXT:         Ending address offset: 0x0000000000000008
>>>  ; CHECK-NEXT: Location description: 55 93 08 93 04 54 93 04
>>> -; CHECK: [[LOC2]]: Beginning address offset: 0x0000000000000004
>>> -; CHECK-NEXT:         Ending address offset: 0x0000000000000008
>>> -;                                     rsi, piece 0x00000004
>>> -; CHECK-NEXT:   Location description: 54 93 04
>>>
>>>  ;
>>>  ; ModuleID = '/Volumes/Data/llvm/test/DebugInfo/X86/sroasplit-2.ll'
>>> @@ -48,6 +46,7 @@ define i32 @foo(i64 %outer.coerce0, i64
>>>    call void @llvm.dbg.declare(metadata !{null}, metadata !27, metadata
>>> !28), !dbg !26
>>>    call void @llvm.dbg.value(metadata i64 %outer.coerce1, i64 0,
>>> metadata !29, metadata !30), !dbg !26
>>>    call void @llvm.dbg.declare(metadata !{null}, metadata !31, metadata
>>> !32), !dbg !26
>>> +  ; The 'trunc' generates no extra code, thus i1 is visible throughout
>>> its scope.
>>>    %outer.sroa.1.8.extract.trunc = trunc i64 %outer.coerce1 to i32, !dbg
>>> !33
>>>    call void @llvm.dbg.value(metadata i32 %outer.sroa.1.8.extract.trunc,
>>> i64 0, metadata !34, metadata !35), !dbg !33
>>>    %outer.sroa.1.12.extract.shift = lshr i64 %outer.coerce1, 32, !dbg !33
>>>
>>> Modified: llvm/trunk/test/DebugInfo/X86/reference-argument.ll
>>> URL:
>>> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/X86/reference-argument.ll?rev=305599&r1=305598&r2=305599&view=diff
>>>
>>> ==============================================================================
>>> --- llvm/trunk/test/DebugInfo/X86/reference-argument.ll (original)
>>> +++ llvm/trunk/test/DebugInfo/X86/reference-argument.ll Fri Jun 16
>>> 17:40:04 2017
>>> @@ -1,4 +1,5 @@
>>> -; RUN: llc -mtriple=x86_64-apple-macosx10.9.0 -filetype=obj -O0 < %s |
>>> llvm-dwarfdump -debug-dump=all - | FileCheck %s
>>> +; RUN: llc -mtriple=x86_64-apple-macosx10.9.0 -filetype=obj -O0 < %s \
>>> +; RUN:   | llvm-dwarfdump -debug-dump=info - | FileCheck %s
>>>  ; ModuleID = 'aggregate-indirect-arg.cpp'
>>>  ; extracted from debuginfo-tests/aggregate-indirect-arg.cpp
>>>
>>> @@ -11,11 +12,10 @@
>>>  ; CHECK:       DW_AT_name {{.*}} "this"
>>>  ; CHECK-NOT:   DW_TAG_subprogram
>>>  ; CHECK:     DW_TAG_formal_parameter
>>> -; CHECK-NEXT:  DW_AT_location [DW_FORM_data4]  (0x00000000)
>>> -; CHECK-NEXT:  DW_AT_name {{.*}} "v"
>>> -; CHECK: .debug_loc contents:
>>> +; CHECK-NEXT:  DW_AT_location
>>>  ;                                rsi+0
>>> -; CHECK:   Location description: 74 00
>>> +; CHECK-SAME:                    74 00
>>> +; CHECK-NEXT:  DW_AT_name {{.*}} "v"
>>>
>>>  target datalayout =
>>> "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
>>>  target triple = "x86_64-apple-macosx10.9.0"
>>>
>>> Modified: llvm/trunk/test/DebugInfo/X86/this-stack_value.ll
>>> URL:
>>> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/X86/this-stack_value.ll?rev=305599&r1=305598&r2=305599&view=diff
>>>
>>> ==============================================================================
>>> --- llvm/trunk/test/DebugInfo/X86/this-stack_value.ll (original)
>>> +++ llvm/trunk/test/DebugInfo/X86/this-stack_value.ll Fri Jun 16
>>> 17:40:04 2017
>>> @@ -1,5 +1,5 @@
>>>  ; RUN: llc -filetype=asm -o - %s | FileCheck %s --check-prefix=ASM
>>> -; RUN: llc -filetype=obj -o - %s | llvm-dwarfdump - | FileCheck %s
>>> +; RUN: llc -filetype=obj -o - %s | llvm-dwarfdump --debug-dump=info - |
>>> FileCheck %s
>>>  ;
>>>  ; Generated at -O2 from:
>>>  ;   struct B;
>>> @@ -18,7 +18,7 @@
>>>  ; modified by the debugger.
>>>  ;
>>>  ; ASM: [DW_OP_stack_value]
>>> -; CHECK:  Location description: 70 00 9f
>>> +; CHECK:  DW_AT_location {{.*}} 70 00 9f
>>>  ;                               rax+0, stack-value
>>>  source_filename = "ab.cpp"
>>>  target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
>>>
>>>
>>> _______________________________________________
>>> llvm-commits mailing list
>>> llvm-commits at lists.llvm.org
>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits
>>
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