[llvm] r289468 - Recommit r288212: Emit 'no line' information for interesting 'orphan' instructions.
Robinson, Paul via llvm-commits
llvm-commits at lists.llvm.org
Fri Dec 16 14:50:02 PST 2016
> -----Original Message-----
> From: aprantl at apple.com [mailto:aprantl at apple.com]
> Sent: Friday, December 16, 2016 2:34 PM
> To: Robinson, Paul
> Cc: llvm-commits; Saleem Abdulrasool
> Subject: Re: [llvm] r289468 - Recommit r288212: Emit 'no line' information
> for interesting 'orphan' instructions.
>
> The use-case that this was derived from is the code that the swift
> compiler generates for top-level code (In Swift there is no explicit
> main() function). The user-written code (with line numbers) and the
> language runtime initialization (compiler-generated, line 0) both end up
> in the main() function. This is why it starts out with line 0 for the
> initialization, followed by the code the user wrote with actual line
> numbers.
So, before my patch, prologue_end gets set on line 0. That seems weird.
The compiler-generated code seems like it ought to be part of the
prologue, and so you would want the debugger to stop on the first non-0
line (in your example this would be line 14).
When you start up a Swift program in the debugger, is the initial stop
before or after the compiler-generated init code? If it's before, is
that really what you want?
--paulr
>
> -- adrian
>
> > On Dec 16, 2016, at 2:29 PM, Robinson, Paul <paul.robinson at sony.com>
> wrote:
> >
> > Sure. I see that the very first debug location is explicitly setting
> line 0. Is that really what you want?
> > --paulr
> >
> > From: aprantl at apple.com [mailto:aprantl at apple.com]
> > Sent: Friday, December 16, 2016 2:00 PM
> > To: Robinson, Paul
> > Cc: llvm-commits; Saleem Abdulrasool
> > Subject: Re: [llvm] r289468 - Recommit r288212: Emit 'no line'
> information for interesting 'orphan' instructions.
> >
> > Hi Paul,
> >
> > we were investigating a test suite regression in the Swift compiler
> (just in case you are curious: https://bugs.swift.org/browse/SR-3421) that
> I could bisect down to this commit.
> >
> > When compiling the attached IR (which I reduced manually from the full
> testcase) llc now runs into a situation where it never sets the
> prologue_end flag for the function main().
> >
> > $llc t.ll -o - | grep '\.loc'
> > .loc 1 0 0
> > .loc 1 14 13
> >
> > I assume that this is something we never want to happen. Would you mind
> taking a look?
> >
> > -- adrian
> >
> >
> > > On Dec 12, 2016, at 12:49 PM, Paul Robinson via llvm-commits <llvm-
> commits at lists.llvm.org> wrote:
> > >
> > > Author: probinson
> > > Date: Mon Dec 12 14:49:11 2016
> > > New Revision: 289468
> > >
> > > URL: http://llvm.org/viewvc/llvm-project?rev=289468&view=rev
> > > Log:
> > > Recommit r288212: Emit 'no line' information for interesting 'orphan'
> instructions.
> > >
> > > DWARF specifies that "line 0" really means "no appropriate source
> > > location" in the line table. By default, use this for branch targets
> > > and some other cases that have no specified source location, to
> > > prevent inheriting unfortunate line numbers from physically preceding
> > > instructions (which might be from completely unrelated source).
> > >
> > > Updated patch allows enabling or suppressing this behavior for all
> > > unspecified source locations.
> > >
> > > Differential Revision: http://reviews.llvm.org/D24180
> > >
> > > Added:
> > > llvm/trunk/test/DebugInfo/X86/dwarf-no-source-loc.ll
> > > Modified:
> > > llvm/trunk/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
> > > llvm/trunk/lib/CodeGen/AsmPrinter/DebugHandlerBase.h
> > > llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
> > > llvm/trunk/test/CodeGen/X86/stack-protector.ll
> > > llvm/trunk/test/CodeGen/X86/unknown-location.ll
> > > llvm/trunk/test/DebugInfo/AArch64/line-header.ll
> > > llvm/trunk/test/DebugInfo/MIR/X86/no-cfi-loc.mir
> > > llvm/trunk/test/DebugInfo/X86/tail-merge.ll
> > >
> > > Modified: llvm/trunk/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
> > > URL: http://llvm.org/viewvc/llvm-
> project/llvm/trunk/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp?rev=289468&
> r1=289467&r2=289468&view=diff
> > >
> ==========================================================================
> ====
> > > --- llvm/trunk/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp (original)
> > > +++ llvm/trunk/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp Mon Dec 12
> 14:49:11 2016
> > > @@ -200,8 +200,10 @@ void DebugHandlerBase::endInstruction()
> > > assert(CurMI != nullptr);
> > > // Don't create a new label after DBG_VALUE instructions.
> > > // They don't generate code.
> > > - if (!CurMI->isDebugValue())
> > > + if (!CurMI->isDebugValue()) {
> > > PrevLabel = nullptr;
> > > + PrevInstBB = CurMI->getParent();
> > > + }
> > >
> > > DenseMap<const MachineInstr *, MCSymbol *>::iterator I =
> > > LabelsAfterInsn.find(CurMI);
> > >
> > > Modified: llvm/trunk/lib/CodeGen/AsmPrinter/DebugHandlerBase.h
> > > URL: http://llvm.org/viewvc/llvm-
> project/llvm/trunk/lib/CodeGen/AsmPrinter/DebugHandlerBase.h?rev=289468&r1
> =289467&r2=289468&view=diff
> > >
> ==========================================================================
> ====
> > > --- llvm/trunk/lib/CodeGen/AsmPrinter/DebugHandlerBase.h (original)
> > > +++ llvm/trunk/lib/CodeGen/AsmPrinter/DebugHandlerBase.h Mon Dec 12
> 14:49:11 2016
> > > @@ -38,10 +38,12 @@ protected:
> > > MachineModuleInfo *MMI;
> > >
> > > /// Previous instruction's location information. This is used to
> > > - /// determine label location to indicate scope boundries in dwarf
> > > - /// debug info.
> > > + /// determine label location to indicate scope boundaries in debug
> info.
> > > + /// We track the previous instruction's source location (if not
> line 0),
> > > + /// whether it was a label, and its parent BB.
> > > DebugLoc PrevInstLoc;
> > > MCSymbol *PrevLabel = nullptr;
> > > + const MachineBasicBlock *PrevInstBB = nullptr;
> > >
> > > /// This location indicates end of function prologue and beginning
> of
> > > /// function body.
> > >
> > > Modified: llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
> > > URL: http://llvm.org/viewvc/llvm-
> project/llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp?rev=289468&r1=289
> 467&r2=289468&view=diff
> > >
> ==========================================================================
> ====
> > > --- llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp (original)
> > > +++ llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp Mon Dec 12
> 14:49:11 2016
> > > @@ -62,11 +62,6 @@ static cl::opt<bool>
> > > DisableDebugInfoPrinting("disable-debug-info-print", cl::Hidden,
> > > cl::desc("Disable debug info printing"));
> > >
> > > -static cl::opt<bool> UnknownLocations(
> > > - "use-unknown-locations", cl::Hidden,
> > > - cl::desc("Make an absence of debug location information
> explicit."),
> > > - cl::init(false));
> > > -
> > > static cl::opt<bool>
> > > GenerateGnuPubSections("generate-gnu-dwarf-pub-sections", cl::Hidden,
> > > cl::desc("Generate GNU-style pubnames and
> pubtypes"),
> > > @@ -81,6 +76,13 @@ namespace {
> > > enum DefaultOnOff { Default, Enable, Disable };
> > > }
> > >
> > > +static cl::opt<DefaultOnOff> UnknownLocations(
> > > + "use-unknown-locations", cl::Hidden,
> > > + cl::desc("Make an absence of debug location information
> explicit."),
> > > + cl::values(clEnumVal(Default, "At top of block or after label"),
> > > + clEnumVal(Enable, "In all cases"), clEnumVal(Disable,
> "Never")),
> > > + cl::init(Default));
> > > +
> > > static cl::opt<DefaultOnOff>
> > > DwarfAccelTables("dwarf-accel-tables", cl::Hidden,
> > > cl::desc("Output prototype dwarf accelerator
> tables."),
> > > @@ -1010,31 +1012,73 @@ void DwarfDebug::beginInstruction(const
> > > if (MI->isDebugValue() || MI->isCFIInstruction())
> > > return;
> > > const DebugLoc &DL = MI->getDebugLoc();
> > > - if (DL == PrevInstLoc)
> > > + // When we emit a line-0 record, we don't update PrevInstLoc; so
> look at
> > > + // the last line number actually emitted, to see if it was line 0.
> > > + unsigned LastAsmLine =
> > > + Asm->OutStreamer->getContext().getCurrentDwarfLoc().getLine();
> > > +
> > > + if (DL == PrevInstLoc) {
> > > + // If we have an ongoing unspecified location, nothing to do
> here.
> > > + if (!DL)
> > > + return;
> > > + // We have an explicit location, same as the previous location.
> > > + // But we might be coming back to it after a line 0 record.
> > > + if (LastAsmLine == 0 && DL.getLine() != 0) {
> > > + // Reinstate the source location but not marked as a statement.
> > > + const MDNode *Scope = DL.getScope();
> > > + recordSourceLine(DL.getLine(), DL.getCol(), Scope,
> /*Flags=*/0);
> > > + }
> > > return;
> > > + }
> > >
> > > if (!DL) {
> > > // We have an unspecified location, which might want to be line 0.
> > > - if (UnknownLocations) {
> > > - PrevInstLoc = DL;
> > > - recordSourceLine(0, 0, nullptr, 0);
> > > + // If we have already emitted a line-0 record, don't repeat it.
> > > + if (LastAsmLine == 0)
> > > + return;
> > > + // If user said Don't Do That, don't do that.
> > > + if (UnknownLocations == Disable)
> > > + return;
> > > + // See if we have a reason to emit a line-0 record now.
> > > + // Reasons to emit a line-0 record include:
> > > + // - User asked for it (UnknownLocations).
> > > + // - Instruction has a label, so it's referenced from somewhere
> else,
> > > + // possibly debug information; we want it to have a source
> location.
> > > + // - Instruction is at the top of a block; we don't want to
> inherit the
> > > + // location from the physically previous (maybe unrelated)
> block.
> > > + if (UnknownLocations == Enable || PrevLabel ||
> > > + (PrevInstBB && PrevInstBB != MI->getParent())) {
> > > + // Preserve the file number, if we can, to save space in the
> line table.
> > > + // Do not update PrevInstLoc, it remembers the last non-0 line.
> > > + // FIXME: Also preserve the column number, to save more space?
> > > + const MDNode *Scope = PrevInstLoc ? PrevInstLoc.getScope() :
> nullptr;
> > > + recordSourceLine(0, 0, Scope, 0);
> > > }
> > > return;
> > > }
> > >
> > > - // We have a new, explicit location.
> > > + // We have an explicit location, different from the previous
> location.
> > > + // Don't repeat a line-0 record, but otherwise emit the new
> location.
> > > + // (The new location might be an explicit line 0, which we do
> emit.)
> > > + if (DL.getLine() == 0 && LastAsmLine == 0)
> > > + return;
> > > unsigned Flags = 0;
> > > - PrevInstLoc = DL;
> > > if (DL == PrologEndLoc) {
> > > Flags |= DWARF2_FLAG_PROLOGUE_END | DWARF2_FLAG_IS_STMT;
> > > PrologEndLoc = DebugLoc();
> > > }
> > > - if (DL.getLine() !=
> > > - Asm->OutStreamer->getContext().getCurrentDwarfLoc().getLine())
> > > + // If the line changed, we call that a new statement; unless we
> went to
> > > + // line 0 and came back, in which case it is not a new statement.
> > > + unsigned OldLine = PrevInstLoc ? PrevInstLoc.getLine() :
> LastAsmLine;
> > > + if (DL.getLine() && DL.getLine() != OldLine)
> > > Flags |= DWARF2_FLAG_IS_STMT;
> > >
> > > const MDNode *Scope = DL.getScope();
> > > recordSourceLine(DL.getLine(), DL.getCol(), Scope, Flags);
> > > +
> > > + // If we're not at line 0, remember this location.
> > > + if (DL.getLine())
> > > + PrevInstLoc = DL;
> > > }
> > >
> > > static DebugLoc findPrologueEndLoc(const MachineFunction *MF) {
> > >
> > > Modified: llvm/trunk/test/CodeGen/X86/stack-protector.ll
> > > URL: http://llvm.org/viewvc/llvm-
> project/llvm/trunk/test/CodeGen/X86/stack-
> protector.ll?rev=289468&r1=289467&r2=289468&view=diff
> > >
> ==========================================================================
> ====
> > > --- llvm/trunk/test/CodeGen/X86/stack-protector.ll (original)
> > > +++ llvm/trunk/test/CodeGen/X86/stack-protector.ll Mon Dec 12 14:49:11
> 2016
> > > @@ -3888,23 +3888,27 @@ entry:
> > > define void @test32() #1 !dbg !7 {
> > > entry:
> > > ; LINUX-I386-LABEL: test32:
> > > -; LINUX-I386: .loc 1 0 0 prologue_end
> > > +; LINUX-I386: .loc 1 4 2 prologue_end
> > > +; LINUX-I386: .loc 1 0 0
> > > ; LINUX-I386-NEXT: calll __stack_chk_fail
> > >
> > > ; LINUX-X64-LABEL: test32:
> > > -; LINUX-X64: .loc 1 0 0 prologue_end
> > > +; LINUX-X64: .loc 1 4 2 prologue_end
> > > +; LINUX-X64: .loc 1 0 0
> > > ; LINUX-X64-NEXT: callq __stack_chk_fail
> > >
> > > ; LINUX-KERNEL-X64-LABEL: test32:
> > > -; LINUX-KERNEL-X64: .loc 1 0 0 prologue_end
> > > +; LINUX-KERNEL-X64: .loc 1 4 2 prologue_end
> > > +; LINUX-KERNEL-X64: .loc 1 0 0
> > > ; LINUX-KERNEL-X64-NEXT: callq __stack_chk_fail
> > >
> > > ; OPENBSD-AMD64-LABEL: test32:
> > > -; OPENBSD-AMD64: .loc 1 0 0 prologue_end
> > > +; OPENBSD-AMD64: .loc 1 4 2 prologue_end
> > > +; OPENBSD-AMD64: .loc 1 0 0
> > > ; OPENBSD-AMD64-NEXT: movl
> > > ; OPENBSD-AMD64-NEXT: callq __stack_smash_handler
> > > %0 = alloca [5 x i8], align 1
> > > - ret void
> > > + ret void, !dbg !9
> > > }
> > >
> > > declare double @testi_aux()
> > > @@ -3940,3 +3944,4 @@ attributes #5 = { ssp "stack-protector-b
> > > !6 = distinct !DISubprogram(name: "__stack_chk_fail", scope: !1, type:
> !8, unit: !0)
> > > !7 = distinct !DISubprogram(name: "test32", scope: !1, type: !8, unit:
> !0)
> > > !8 = !DISubroutineType(types: !2)
> > > +!9 = !DILocation(line: 4, column: 2, scope: !7)
> > >
> > > Modified: llvm/trunk/test/CodeGen/X86/unknown-location.ll
> > > URL: http://llvm.org/viewvc/llvm-
> project/llvm/trunk/test/CodeGen/X86/unknown-
> location.ll?rev=289468&r1=289467&r2=289468&view=diff
> > >
> ==========================================================================
> ====
> > > --- llvm/trunk/test/CodeGen/X86/unknown-location.ll (original)
> > > +++ llvm/trunk/test/CodeGen/X86/unknown-location.ll Mon Dec 12
> 14:49:11 2016
> > > @@ -1,4 +1,4 @@
> > > -; RUN: llc < %s -asm-verbose=false -mtriple=x86_64-apple-darwin10 -
> use-unknown-locations | FileCheck %s
> > > +; RUN: llc < %s -asm-verbose=false -mtriple=x86_64-apple-darwin10 -
> use-unknown-locations=Enable | FileCheck %s
> > >
> > > ; The divide instruction does not have a debug location. CodeGen
> should
> > > ; represent this in the debug information. This is done by setting
> line
> > >
> > > Modified: llvm/trunk/test/DebugInfo/AArch64/line-header.ll
> > > URL: http://llvm.org/viewvc/llvm-
> project/llvm/trunk/test/DebugInfo/AArch64/line-
> header.ll?rev=289468&r1=289467&r2=289468&view=diff
> > >
> ==========================================================================
> ====
> > > --- llvm/trunk/test/DebugInfo/AArch64/line-header.ll (original)
> > > +++ llvm/trunk/test/DebugInfo/AArch64/line-header.ll Mon Dec 12
> 14:49:11 2016
> > > @@ -3,4 +3,4 @@
> > >
> > > ; check line table length is correctly calculated for both big and
> little endian
> > > CHECK-LABEL: .debug_line contents:
> > > -CHECK: total_length: 0x0000003c
> > > +CHECK: total_length: 0x0000003e
> > >
> > > Modified: llvm/trunk/test/DebugInfo/MIR/X86/no-cfi-loc.mir
> > > URL: http://llvm.org/viewvc/llvm-
> project/llvm/trunk/test/DebugInfo/MIR/X86/no-cfi-
> loc.mir?rev=289468&r1=289467&r2=289468&view=diff
> > >
> ==========================================================================
> ====
> > > --- llvm/trunk/test/DebugInfo/MIR/X86/no-cfi-loc.mir (original)
> > > +++ llvm/trunk/test/DebugInfo/MIR/X86/no-cfi-loc.mir Mon Dec 12
> 14:49:11 2016
> > > @@ -1,6 +1,6 @@
> > > # Verify that a CFI instruction with no debug location
> > > # does not result in a line-0 location in the assembler.
> > > -# RUN: %llc_dwarf -start-after=prologepilog -march=x86-64 -use-
> unknown-locations %s -o - | FileCheck %s
> > > +# RUN: %llc_dwarf -start-after=prologepilog -march=x86-64 -use-
> unknown-locations=Enable %s -o - | FileCheck %s
> > > #
> > > # CHECK-NOT: .loc 1 0
> > > # CHECK: .cfi_def_cfa_offset
> > >
> > > Added: llvm/trunk/test/DebugInfo/X86/dwarf-no-source-loc.ll
> > > URL: http://llvm.org/viewvc/llvm-
> project/llvm/trunk/test/DebugInfo/X86/dwarf-no-source-
> loc.ll?rev=289468&view=auto
> > >
> ==========================================================================
> ====
> > > --- llvm/trunk/test/DebugInfo/X86/dwarf-no-source-loc.ll (added)
> > > +++ llvm/trunk/test/DebugInfo/X86/dwarf-no-source-loc.ll Mon Dec 12
> 14:49:11 2016
> > > @@ -0,0 +1,77 @@
> > > +; Verify "no source location" directives appear in appropriate
> places,
> > > +; but don't appear when we explicitly suppress them.
> > > +; RUN: llc < %s -o - | FileCheck %s
> > > +; RUN: llc < %s -o - -use-unknown-locations=Disable | FileCheck %s --
> check-prefix=DISABLE
> > > +
> > > +; Generated from this .cpp targeting linux using -g
> > > +; and then removed function attributes as clutter.
> > > +;
> > > +; void bar(int *);
> > > +; void baz(int *);
> > > +; # 5 "no-source-loc.cpp"
> > > +; void foo(int x) {
> > > +; int z;
> > > +; if (x)
> > > +; # 20 "include.h"
> > > +; bar(&z);
> > > +; # 10 "no-source-loc.cpp"
> > > +; baz(&z);
> > > +; }
> > > +
> > > +target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
> > > +target triple = "x86_64-unknown-linux-gnu"
> > > +
> > > +; Function Attrs: uwtable
> > > +define void @_Z3fooi(i32 %x) !dbg !6 {
> > > +entry:
> > > + %x.addr = alloca i32, align 4
> > > + %z = alloca i32, align 4
> > > + store i32 %x, i32* %x.addr, align 4
> > > + %0 = load i32, i32* %x.addr, align 4, !dbg !8
> > > + %tobool = icmp ne i32 %0, 0, !dbg !8
> > > + br i1 %tobool, label %if.then, label %if.end, !dbg !8
> > > +
> > > +if.then: ; preds = %entry
> > > + call void @_Z3barPi(i32* %z), !dbg !9
> > > + br label %if.end, !dbg !9
> > > +
> > > +if.end: ; preds = %if.then,
> %entry
> > > + call void @_Z3bazPi(i32* %z), !dbg !12
> > > + ret void, !dbg !14
> > > +}
> > > +
> > > +; CHECK: .loc 1 7 7
> > > +; CHECK-NOT: .loc
> > > +; CHECK: .loc 1 0 0 is_stmt 0
> > > +; CHECK-NOT: .loc
> > > +; CHECK: .loc 2 20 5 is_stmt 1
> > > +; CHECK: .LBB0_2:
> > > +; CHECK-NEXT: .loc 2 0 0 is_stmt 0
> > > +; CHECK-NOT: .loc
> > > +; CHECK: .loc 1 10 3 is_stmt 1
> > > +;
> > > +; DISABLE-NOT: .loc 1 0
> > > +
> > > +declare void @_Z3barPi(i32*)
> > > +
> > > +declare void @_Z3bazPi(i32*)
> > > +
> > > +!llvm.dbg.cu = !{!0}
> > > +!llvm.module.flags = !{!3, !4}
> > > +!llvm.ident = !{!5}
> > > +
> > > +!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1,
> producer: "clang version 4.0.0 (trunk 278782)", isOptimized: false,
> runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2)
> > > +!1 = !DIFile(filename: "no-source-loc.cpp", directory: "/tests")
> > > +!2 = !{}
> > > +!3 = !{i32 2, !"Dwarf Version", i32 4}
> > > +!4 = !{i32 2, !"Debug Info Version", i32 3}
> > > +!5 = !{!"clang version 4.0.0 (trunk 278782)"}
> > > +!6 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line:
> 5, type: !7, isLocal: false, isDefinition: true, scopeLine: 5, flags:
> DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
> > > +!7 = !DISubroutineType(types: !2)
> > > +!8 = !DILocation(line: 7, column: 7, scope: !6)
> > > +!9 = !DILocation(line: 20, column: 5, scope: !10)
> > > +!10 = !DILexicalBlockFile(scope: !6, file: !11, discriminator: 0)
> > > +!11 = !DIFile(filename: "include.h", directory: "/tests")
> > > +!12 = !DILocation(line: 10, column: 3, scope: !13)
> > > +!13 = !DILexicalBlockFile(scope: !6, file: !1, discriminator: 0)
> > > +!14 = !DILocation(line: 11, column: 1, scope: !13)
> > >
> > > Modified: llvm/trunk/test/DebugInfo/X86/tail-merge.ll
> > > URL: http://llvm.org/viewvc/llvm-
> project/llvm/trunk/test/DebugInfo/X86/tail-
> merge.ll?rev=289468&r1=289467&r2=289468&view=diff
> > >
> ==========================================================================
> ====
> > > --- llvm/trunk/test/DebugInfo/X86/tail-merge.ll (original)
> > > +++ llvm/trunk/test/DebugInfo/X86/tail-merge.ll Mon Dec 12 14:49:11
> 2016
> > > @@ -1,4 +1,4 @@
> > > -; RUN: llc %s -mtriple=x86_64-unknown-unknown -use-unknown-
> locations=true -o - | FileCheck %s
> > > +; RUN: llc %s -mtriple=x86_64-unknown-unknown -use-unknown-
> locations=Enable -o - | FileCheck %s
> > >
> > > ; Generated with "clang -gline-tables-only -c -emit-llvm -o - | opt -
> sroa -S"
> > > ; from source:
> > >
> > >
> > > _______________________________________________
> > > llvm-commits mailing list
> > > llvm-commits at lists.llvm.org
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