[@<GlobalVarName> =] [Linkage] [Visibility] [DLLStorageClass] [ThreadLocal]
[unnamed_addr] [AddrSpace] [ExternallyInitialized]
<global | constant> <Type> [<InitializerConstant>]
- [, section "name"] [, align <Alignment>]
+ [, section "name"] [, comdat [($name)]]
+ [, align <Alignment>]
For example, the following defines a global in a numbered address space
with an initializer, section, and alignment:
define [linkage] [visibility] [DLLStorageClass]
[cconv] [ret attrs]
<ResultType> @<FunctionName> ([argument list])
- [unnamed_addr] [fn Attrs] [section "name"] [comdat $<ComdatName>]
+ [unnamed_addr] [fn Attrs] [section "name"] [comdat [($name)]]
[align N] [gc] [prefix Constant] [prologue Constant] { ... }
The argument list is a comma seperated sequence of arguments where each
.. code-block:: llvm
$foo = comdat largest
- @foo = global i32 2, comdat $foo
+ @foo = global i32 2, comdat($foo)
- define void @bar() comdat $foo {
+ define void @bar() comdat($foo) {
ret void
}
+As a syntactic sugar the ``$name`` can be omitted if the name is the same as
+the global name:
+
+.. code-block:: llvm
+
+ $foo = comdat any
+ @foo = global i32 2, comdat
+
+
In a COFF object file, this will create a COMDAT section with selection kind
``IMAGE_COMDAT_SELECT_LARGEST`` containing the contents of the ``@foo`` symbol
and another COMDAT section with selection kind
$foo = comdat any
$bar = comdat any
- @g1 = global i32 42, section "sec", comdat $foo
- @g2 = global i32 42, section "sec", comdat $bar
+ @g1 = global i32 42, section "sec", comdat($foo)
+ @g2 = global i32 42, section "sec", comdat($bar)
From the object file perspective, this requires the creation of two sections
with the same name. This is necessary because both globals belong to different
GV->setAlignment(Alignment);
} else {
Comdat *C;
- if (parseOptionalComdat(C))
+ if (parseOptionalComdat(Name, C))
return true;
if (C)
GV->setComdat(C);
ParseGlobalValue(Ty, V);
}
-bool LLParser::parseOptionalComdat(Comdat *&C) {
+bool LLParser::parseOptionalComdat(StringRef GlobalName, Comdat *&C) {
C = nullptr;
+
+ LocTy KwLoc = Lex.getLoc();
if (!EatIfPresent(lltok::kw_comdat))
return false;
- if (Lex.getKind() != lltok::ComdatVar)
- return TokError("expected comdat variable");
- LocTy Loc = Lex.getLoc();
- StringRef Name = Lex.getStrVal();
- C = getComdat(Name, Loc);
- Lex.Lex();
+
+ if (EatIfPresent(lltok::lparen)) {
+ if (Lex.getKind() != lltok::ComdatVar)
+ return TokError("expected comdat variable");
+ C = getComdat(Lex.getStrVal(), Lex.getLoc());
+ Lex.Lex();
+ if (ParseToken(lltok::rparen, "expected ')' after comdat var"))
+ return true;
+ } else {
+ if (GlobalName.empty())
+ return TokError("comdat cannot be unnamed");
+ C = getComdat(GlobalName, KwLoc);
+ }
+
return false;
}
BuiltinLoc) ||
(EatIfPresent(lltok::kw_section) &&
ParseStringConstant(Section)) ||
- parseOptionalComdat(C) ||
+ parseOptionalComdat(FunctionName, C) ||
ParseOptionalAlignment(Alignment) ||
(EatIfPresent(lltok::kw_gc) &&
ParseStringConstant(GC)) ||
bool ParseGlobalValue(Type *Ty, Constant *&V);
bool ParseGlobalTypeAndValue(Constant *&V);
bool ParseGlobalValueVector(SmallVectorImpl<Constant *> &Elts);
- bool parseOptionalComdat(Comdat *&C);
+ bool parseOptionalComdat(StringRef GlobalName, Comdat *&C);
bool ParseMetadataAsValue(Value *&V, PerFunctionState &PFS);
bool ParseValueAsMetadata(Metadata *&MD, PerFunctionState *PFS);
bool ParseMetadata(Metadata *&MD, PerFunctionState *PFS);
}
}
+static void maybePrintComdat(formatted_raw_ostream &Out,
+ const GlobalObject &GO) {
+ const Comdat *C = GO.getComdat();
+ if (!C)
+ return;
+
+ if (isa<GlobalVariable>(GO))
+ Out << ',';
+ Out << " comdat";
+
+ if (GO.getName() == C->getName())
+ return;
+
+ Out << '(';
+ PrintLLVMName(Out, C->getName(), ComdatPrefix);
+ Out << ')';
+}
+
void AssemblyWriter::printGlobal(const GlobalVariable *GV) {
if (GV->isMaterializable())
Out << "; Materializable\n";
PrintEscapedString(GV->getSection(), Out);
Out << '"';
}
- if (GV->hasComdat()) {
- Out << ", comdat ";
- PrintLLVMName(Out, GV->getComdat()->getName(), ComdatPrefix);
- }
+ maybePrintComdat(Out, *GV);
if (GV->getAlignment())
Out << ", align " << GV->getAlignment();
PrintEscapedString(F->getSection(), Out);
Out << '"';
}
- if (F->hasComdat()) {
- Out << " comdat ";
- PrintLLVMName(Out, F->getComdat()->getName(), ComdatPrefix);
- }
+ maybePrintComdat(Out, *F);
if (F->getAlignment())
Out << " align " << F->getAlignment();
if (F->hasGC())
; RUN: not llvm-as < %s 2>&1 | FileCheck %s
-@v = global i32 0, comdat $v
+@v = global i32 0, comdat($v)
; CHECK: use of undefined comdat '$v'
--- /dev/null
+; RUN: not llvm-as < %s 2>&1 | FileCheck %s
+; CHECK: comdat cannot be unnamed
+
+define void @0() comdat {
+ ret void
+}
; RUN: llc -mtriple i386-pc-win32 < %s | FileCheck %s
$f1 = comdat any
-@v1 = global i32 0, comdat $f1
-define void @f1() comdat $f1 {
+@v1 = global i32 0, comdat($f1)
+define void @f1() comdat($f1) {
ret void
}
$f2 = comdat exactmatch
-@v2 = global i32 0, comdat $f2
-define void @f2() comdat $f2 {
+@v2 = global i32 0, comdat($f2)
+define void @f2() comdat($f2) {
ret void
}
$f3 = comdat largest
-@v3 = global i32 0, comdat $f3
-define void @f3() comdat $f3 {
+@v3 = global i32 0, comdat($f3)
+define void @f3() comdat($f3) {
ret void
}
$f4 = comdat noduplicates
-@v4 = global i32 0, comdat $f4
-define void @f4() comdat $f4 {
+@v4 = global i32 0, comdat($f4)
+define void @f4() comdat($f4) {
ret void
}
$f5 = comdat samesize
-@v5 = global i32 0, comdat $f5
-define void @f5() comdat $f5 {
+@v5 = global i32 0, comdat($f5)
+define void @f5() comdat($f5) {
ret void
}
$f6 = comdat samesize
-@v6 = global i32 0, comdat $f6
-@f6 = global i32 0, comdat $f6
+@v6 = global i32 0, comdat($f6)
+@f6 = global i32 0, comdat($f6)
$"\01@f7@0" = comdat any
-define x86_fastcallcc void @"\01@v7@0"() comdat $"\01@f7@0" {
+define x86_fastcallcc void @"\01@v7@0"() comdat($"\01@f7@0") {
ret void
}
-define x86_fastcallcc void @"\01@f7@0"() comdat $"\01@f7@0" {
+define x86_fastcallcc void @"\01@f7@0"() comdat($"\01@f7@0") {
ret void
}
$f8 = comdat any
-define x86_fastcallcc void @v8() comdat $f8 {
+define x86_fastcallcc void @v8() comdat($f8) {
ret void
}
-define x86_fastcallcc void @f8() comdat $f8 {
+define x86_fastcallcc void @f8() comdat($f8) {
ret void
}
$vftable = comdat largest
-@some_name = private unnamed_addr constant [2 x i8*] zeroinitializer, comdat $vftable
+@some_name = private unnamed_addr constant [2 x i8*] zeroinitializer, comdat($vftable)
@vftable = alias getelementptr([2 x i8*]* @some_name, i32 0, i32 1)
; CHECK: .section .text,"xr",discard,_f1
$foo = comdat largest
@foo = global i32 0
-@bar = global i32 0, comdat $foo
+@bar = global i32 0, comdat($foo)
; CHECK: Associative COMDAT symbol 'foo' is not a key for its COMDAT.
target triple = "i686-pc-windows-msvc"
$foo = comdat largest
-@bar = global i32 0, comdat $foo
+@bar = global i32 0, comdat($foo)
; CHECK: Associative COMDAT symbol 'foo' does not exist.
; RUN: llc -mtriple x86_64-pc-linux-gnu < %s | FileCheck %s
$f = comdat any
-@v = global i32 0, comdat $f
-define void @f() comdat $f {
+@v = global i32 0, comdat($f)
+define void @f() comdat($f) {
ret void
}
; CHECK: .section .text.f,"axG",@progbits,f,comdat
; RUN: llc -mtriple x86_64-pc-linux-gnu < %s | FileCheck %s
$foo = comdat any
-@bar = global i32 42, comdat $foo
+@bar = global i32 42, comdat($foo)
@foo = global i32 42
; CHECK: .type bar,@object
; RUN: FileCheck < %t %s
$f = comdat any
-@v = global i32 0, comdat $f
+@v = global i32 0, comdat($f)
; CHECK: LLVM ERROR: MachO doesn't support COMDATs, 'f' cannot be lowered.
$f2 = comdat any
; CHECK-NOT: f2
-@v = global i32 0, comdat $f
-; CHECK: @v = global i32 0, comdat $f
+@v = global i32 0, comdat($f)
+; CHECK: @v = global i32 0, comdat($f)
@a = alias i32* @v
; CHECK: @a = alias i32* @v{{$}}
-define void @f() comdat $f {
+define void @f() comdat($f) {
ret void
}
-; CHECK: define void @f() comdat $f
+; CHECK: define void @f() comdat {
$i = comdat largest
-@i = internal global i32 0, comdat $i
+@i = internal global i32 0, comdat($i)
target triple = "i686-pc-windows-msvc"
; no action should be taken for these globals
$global_noinst = comdat largest
-@aliasee = private unnamed_addr constant [2 x i8] [i8 1, i8 2], comdat $global_noinst
+@aliasee = private unnamed_addr constant [2 x i8] [i8 1, i8 2], comdat($global_noinst)
@global_noinst = unnamed_addr alias [2 x i8]* @aliasee
; CHECK-NOT: {{asan_gen.*global_noinst}}
; CHECK-DAG: @global_noinst = unnamed_addr alias [2 x i8]* @aliasee
target triple = "i686-pc-windows-msvc"
$foo = comdat largest
-@foo = global i64 43, comdat $foo
+@foo = global i64 43, comdat($foo)
-define i32 @bar() comdat $foo {
+define i32 @bar() comdat($foo) {
ret i32 43
}
$qux = comdat largest
-@qux = global i32 13, comdat $qux
-@in_unselected_group = global i32 13, comdat $qux
+@qux = global i32 13, comdat($qux)
+@in_unselected_group = global i32 13, comdat($qux)
-define i32 @baz() comdat $qux {
+define i32 @baz() comdat($qux) {
ret i32 13
}
$any = comdat any
-@any = global i64 7, comdat $any
+@any = global i64 7, comdat($any)
$foo = comdat largest
-@foo = global i64 43, comdat $foo
+@foo = global i64 43, comdat($foo)
$foo = comdat noduplicates
-@foo = global i64 43, comdat $foo
+@foo = global i64 43, comdat($foo)
target triple = "i686-pc-windows-msvc"
$foo = comdat samesize
-@foo = global i64 42, comdat $foo
+@foo = global i64 42, comdat($foo)
$foo = comdat largest
@zed = external constant i8
-@some_name = private unnamed_addr constant [2 x i8*] [i8* @zed, i8* bitcast (void ()* @bar to i8*)], comdat $foo
+@some_name = private unnamed_addr constant [2 x i8*] [i8* @zed, i8* bitcast (void ()* @bar to i8*)], comdat($foo)
@foo = alias getelementptr([2 x i8*]* @some_name, i32 0, i32 1)
declare void @bar() unnamed_addr
$c1 = comdat largest
-@some_name = private unnamed_addr constant i32 42, comdat $c1
+@some_name = private unnamed_addr constant i32 42, comdat($c1)
@c1 = alias i32* @some_name
@v1 = weak hidden global i32 0
@v2 = weak protected global i32 0
@v3 = weak hidden global i32 0
-@v4 = hidden global i32 1, comdat $c1
+@v4 = hidden global i32 1, comdat($c1)
; Aliases
@a1 = weak hidden alias i32* @v1
target triple = "i686-pc-windows-msvc"
$foo = comdat largest
-@foo = global i32 42, comdat $foo
+@foo = global i32 42, comdat($foo)
-define i32 @bar() comdat $foo {
+define i32 @bar() comdat($foo) {
ret i32 42
}
$qux = comdat largest
-@qux = global i64 12, comdat $qux
+@qux = global i64 12, comdat($qux)
-define i32 @baz() comdat $qux {
+define i32 @baz() comdat($qux) {
ret i32 12
}
$any = comdat any
-@any = global i64 6, comdat $any
+@any = global i64 6, comdat($any)
; CHECK: $qux = comdat largest
; CHECK: $foo = comdat largest
; CHECK: $any = comdat any
-; CHECK: @qux = global i64 12, comdat $qux
-; CHECK: @any = global i64 6, comdat $any
-; CHECK: @foo = global i64 43, comdat $foo
+; CHECK: @qux = global i64 12, comdat{{$}}
+; CHECK: @any = global i64 6, comdat{{$}}
+; CHECK: @foo = global i64 43, comdat{{$}}
; CHECK-NOT: @in_unselected_group = global i32 13, comdat $qux
-; CHECK: define i32 @baz() comdat $qux
-; CHECK: define i32 @bar() comdat $foo
+; CHECK: define i32 @baz() comdat($qux)
+; CHECK: define i32 @bar() comdat($foo)
target triple = "i686-pc-windows-msvc"
$foo = comdat samesize
-@foo = global i32 42, comdat $foo
+@foo = global i32 42, comdat($foo)
; CHECK: Linking COMDATs named 'foo': invalid selection kinds!
; RUN: not llvm-link %s %p/Inputs/comdat2.ll -S -o - 2>&1 | FileCheck %s
$foo = comdat largest
-@foo = global i32 43, comdat $foo
+@foo = global i32 43, comdat($foo)
; CHECK: Linking COMDATs named 'foo': can't do size dependent selection without DataLayout!
; RUN: not llvm-link %s %p/Inputs/comdat3.ll -S -o - 2>&1 | FileCheck %s
$foo = comdat noduplicates
-@foo = global i64 43, comdat $foo
+@foo = global i64 43, comdat($foo)
; CHECK: Linking COMDATs named 'foo': noduplicates has been violated!
target triple = "i686-pc-windows-msvc"
$foo = comdat samesize
-@foo = global i32 42, comdat $foo
+@foo = global i32 42, comdat($foo)
; CHECK: Linking COMDATs named 'foo': SameSize violated!
target datalayout = "e-m:w-p:32:32-i64:64-f80:32-n8:16:32-S32"
$foo = comdat largest
-@foo = linkonce_odr unnamed_addr constant [1 x i8*] [i8* bitcast (void ()* @bar to i8*)], comdat $foo
+@foo = linkonce_odr unnamed_addr constant [1 x i8*] [i8* bitcast (void ()* @bar to i8*)], comdat($foo)
; CHECK: @foo = alias getelementptr inbounds ([2 x i8*]* @some_name, i32 0, i32 1)
$c1 = comdat largest
-define void @c1() comdat $c1 {
+define void @c1() comdat($c1) {
ret void
}
; CHECK: GlobalVariable required for data dependent selection!
$c1 = comdat largest
-@some_name = private unnamed_addr constant i32 42, comdat $c1
+@some_name = private unnamed_addr constant i32 42, comdat($c1)
@c1 = alias i8* inttoptr (i32 ptrtoint (i32* @some_name to i32) to i8*)
; CHECK: COMDAT key involves incomputable alias size.
$c = comdat any
@a = alias void ()* @f
-define internal void @f() comdat $c {
+define internal void @f() comdat($c) {
ret void
}
; CHECK-DAG: $c = comdat any
; CHECK-DAG: @a = alias void ()* @f
-; CHECK-DAG: define internal void @f() comdat $c
+; CHECK-DAG: define internal void @f() comdat($c)
$f2 = comdat largest
-define internal void @f2() comdat $f2 {
+define internal void @f2() comdat($f2) {
ret void
}
; CHECK-DAG: $f2 = comdat largest
-; CHECK-DAG: define internal void @f2() comdat $f2
+; CHECK-DAG: define internal void @f2() comdat {
@_ZN3fooIiEC1Ev = weak_odr alias void ()* @_ZN3fooIiEC2Ev
; CHECK: @_ZN3fooIiEC1Ev = weak_odr alias void ()* @_ZN3fooIiEC2Ev
-; CHECK: define weak_odr void @_ZN3fooIiEC2Ev() comdat $_ZN3fooIiEC5Ev {
-define weak_odr void @_ZN3fooIiEC2Ev() comdat $_ZN3fooIiEC5Ev {
+; CHECK: define weak_odr void @_ZN3fooIiEC2Ev() comdat($_ZN3fooIiEC5Ev) {
+define weak_odr void @_ZN3fooIiEC2Ev() comdat($_ZN3fooIiEC5Ev) {
ret void
}
; CHECK-DAG: @v3 = hidden global i32 0
@v3 = protected global i32 0
-; CHECK-DAG: @v4 = hidden global i32 1, comdat $c1
-@v4 = global i32 1, comdat $c1
+; CHECK-DAG: @v4 = hidden global i32 1, comdat($c1)
+@v4 = global i32 1, comdat($c1)
; Aliases
; CHECK: @a1 = hidden alias i32* @v1
@a1 = linkonce_odr alias void ()* @f1
; CHECK: @a1 = linkonce_odr alias void ()* @f1
-define linkonce_odr void @f1() comdat $c1 {
+define linkonce_odr void @f1() comdat($c1) {
ret void
}
-; CHECK: define linkonce_odr void @f1() comdat $c1
+; CHECK: define linkonce_odr void @f1() comdat($c1)
define void @g() {
call void @f1()
$c = comdat any
; CHECK: $c = comdat any
-define linkonce_odr void @foo() comdat $c {
+define linkonce_odr void @foo() comdat($c) {
ret void
}
-; CHECK: define linkonce_odr void @foo() comdat $c
+; CHECK: define linkonce_odr void @foo() comdat($c)
-define linkonce_odr void @bar() comdat $c {
+define linkonce_odr void @bar() comdat($c) {
ret void
}
-; CHECK: define linkonce_odr void @bar() comdat $c
+; CHECK: define linkonce_odr void @bar() comdat($c)
define void @zed() {
call void @foo()
$comdat_global = comdat any
-@comdat_global = weak_odr global i8 0, comdat $comdat_global
+@comdat_global = weak_odr global i8 0, comdat($comdat_global)
@simple_global = internal global i8 0
-; CHECK: @comdat_global = weak_odr global i8 0, comdat $comdat_global
+; CHECK: @comdat_global = weak_odr global i8 0, comdat{{$}}
; CHECK: @simple_global = internal global i8 42
@llvm.global_ctors = appending global [2 x { i32, void ()*, i8* }] [
}
; CHECK: define void @init_comdat_global()
-define internal void @init_simple_global() comdat $comdat_global {
+define internal void @init_simple_global() comdat($comdat_global) {
store i8 42, i8* @simple_global
ret void
}
$c = comdat any
; CHECK: $c = comdat any
-define linkonce_odr void @foo() comdat $c {
+define linkonce_odr void @foo() comdat($c) {
ret void
}
-; CHECK: define linkonce_odr void @foo() comdat $c
+; CHECK: define linkonce_odr void @foo() comdat($c)
-define linkonce_odr void @bar() comdat $c {
+define linkonce_odr void @bar() comdat($c) {
ret void
}
-; CHECK: define linkonce_odr void @bar() comdat $c
+; CHECK: define linkonce_odr void @bar() comdat($c)
define void()* @zed() {
ret void()* @foo
; RUN: not llvm-as %s -o /dev/null 2>&1 | FileCheck %s
$v = comdat any
-@v = common global i32 0, comdat $v
+@v = common global i32 0, comdat($v)
; CHECK: 'common' global may not be in a Comdat!
; RUN: not llvm-as %s -o /dev/null 2>&1 | FileCheck %s
$v = comdat any
-@v = private global i32 0, comdat $v
+@v = private global i32 0, comdat($v)
; CHECK: comdat global value has private linkage
$c2 = comdat any
-@v1 = weak_odr global i32 41, comdat $c2
-define weak_odr protected i32 @f1(i8* %this) comdat $c2 {
+@v1 = weak_odr global i32 41, comdat($c2)
+define weak_odr protected i32 @f1(i8* %this) comdat($c2) {
bb20:
store i8* %this, i8** null
br label %bb21
$c1 = comdat any
-@v1 = weak_odr global i32 42, comdat $c1
-define weak_odr i32 @f1(i8*) comdat $c1 {
+@v1 = weak_odr global i32 42, comdat($c1)
+define weak_odr i32 @f1(i8*) comdat($c1) {
bb10:
br label %bb11
bb11:
; CHECK: $c1 = comdat any
; CHECK: $c2 = comdat any
-; CHECK: @v1 = weak_odr global i32 42, comdat $c1
+; CHECK: @v1 = weak_odr global i32 42, comdat($c1)
; CHECK: @r11 = global i32* @v1{{$}}
; CHECK: @r12 = global i32 (i8*)* @f1{{$}}
; CHECK: @r21 = global i32* @v1{{$}}
; CHECK: @r22 = global i32 (i8*)* @f1{{$}}
-; CHECK: @v11 = internal global i32 41, comdat $c2
+; CHECK: @v11 = internal global i32 41, comdat($c2)
; CHECK: @a11 = alias i32* @v1{{$}}
; CHECK: @a12 = alias bitcast (i32* @v1 to i16*)
; CHECK: @a23 = alias i32 (i8*)* @f12{{$}}
; CHECK: @a24 = alias bitcast (i32 (i8*)* @f12 to i16*)
-; CHECK: define weak_odr protected i32 @f1(i8*) comdat $c1 {
+; CHECK: define weak_odr protected i32 @f1(i8*) comdat($c1) {
; CHECK-NEXT: bb10:
; CHECK-NEXT: br label %bb11{{$}}
; CHECK: bb11:
; CHECK-NEXT: ret i32 42
; CHECK-NEXT: }
-; CHECK: define internal i32 @f12(i8* %this) comdat $c2 {
+; CHECK: define internal i32 @f12(i8* %this) comdat($c2) {
; CHECK-NEXT: bb20:
; CHECK-NEXT: store i8* %this, i8** null
; CHECK-NEXT: br label %bb21