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Implement the "linker_private_weak" linkage type. This will be used for

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Objective-C metadata types which should be marked as "weak", but which the
linker will remove upon final linkage. However, this linkage isn't specific to
Objective-C.

For example, the "objc_msgSend_fixup_alloc" symbol is defined like this:

      .globl l_objc_msgSend_fixup_alloc
      .weak_definition l_objc_msgSend_fixup_alloc
      .section __DATA, __objc_msgrefs, coalesced
      .align 3
l_objc_msgSend_fixup_alloc:
       .quad   _objc_msgSend_fixup
       .quad   L_OBJC_METH_VAR_NAME_1

This is different from the "linker_private" linkage type, because it can't have
the metadata defined with ".weak_definition".

Currently only supported on Darwin platforms.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107433 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2010-07-01 21:55:59 +00:00
parent 0f66d4be04
commit 5e721d7682
21 changed files with 90 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
bindings/ada/llvm/llvm.ads
View File

@ -316,7 +316,8 @@ package llvm is
LLVMExternalWeakLinkage,
LLVMGhostLinkage,
LLVMCommonLinkage,
LLVMLinkerPrivateLinkage);
LLVMLinkerPrivateLinkage,
LLVMLinkerPrivateWeakLinkage);
for LLVMLinkage use
(LLVMExternalLinkage => 0,
@ -333,7 +334,8 @@ package llvm is
LLVMExternalWeakLinkage => 11,
LLVMGhostLinkage => 12,
LLVMCommonLinkage => 13,
LLVMLinkerPrivateLinkage => 14);
LLVMLinkerPrivateLinkage => 14,
LLVMLinkerPrivateWeakLinkage => 15);
pragma Convention (C, LLVMLinkage);

33
docs/LangRef.html
View File

@ -24,6 +24,7 @@
<ol>
<li><a href="#linkage_private">'<tt>private</tt>' Linkage</a></li>
<li><a href="#linkage_linker_private">'<tt>linker_private</tt>' Linkage</a></li>
<li><a href="#linkage_linker_private_weak">'<tt>linker_private_weak</tt>' Linkage</a></li>
<li><a href="#linkage_internal">'<tt>internal</tt>' Linkage</a></li>
<li><a href="#linkage_available_externally">'<tt>available_externally</tt>' Linkage</a></li>
<li><a href="#linkage_linkonce">'<tt>linkonce</tt>' Linkage</a></li>
@ -546,20 +547,24 @@ define i32 @main() { <i>; i32()* </i>
<dl>
<dt><tt><b><a name="linkage_private">private</a></b></tt></dt>
<dd>Global values with private linkage are only directly accessible by objects
in the current module. In particular, linking code into a module with an
private global value may cause the private to be renamed as necessary to
avoid collisions. Because the symbol is private to the module, all
references can be updated. This doesn't show up in any symbol table in the
object file.</dd>
<dd>Global values with "<tt>private</tt>" linkage are only directly accessible
by objects in the current module. In particular, linking code into a
module with an private global value may cause the private to be renamed as
necessary to avoid collisions. Because the symbol is private to the
module, all references can be updated. This doesn't show up in any symbol
table in the object file.</dd>
<dt><tt><b><a name="linkage_linker_private">linker_private</a></b></tt></dt>
<dd>Similar to private, but the symbol is passed through the assembler and
removed by the linker after evaluation. Note that (unlike private
symbols) linker_private symbols are subject to coalescing by the linker:
weak symbols get merged and redefinitions are rejected. However, unlike
normal strong symbols, they are removed by the linker from the final
linked image (executable or dynamic library).</dd>
<dd>Similar to <tt>private</tt>, but the symbol is passed through the
assembler and evaluated by the linker. Unlike normal strong symbols, they
are removed by the linker from the final linked image (executable or
dynamic library).</dd>
<dt><tt><b><a name="linkage_linker_private_weak">linker_private_weak</a></b></tt></dt>
<dd>Similar to "<tt>linker_private</tt>", but the symbol is weak. Note that
<tt>linker_private_weak</tt> symbols are subject to coalescing by the
linker. The symbols are removed by the linker from the final linked image
(executable or dynamic library).</dd>
<dt><tt><b><a name="linkage_internal">internal</a></b></tt></dt>
<dd>Similar to private, but the value shows as a local symbol
@ -623,8 +628,8 @@ define i32 @main() { <i>; i32()* </i>
<dt><tt><b><a name="linkage_weak_odr">weak_odr</a></b></tt></dt>
<dd>Some languages allow differing globals to be merged, such as two functions
with different semantics. Other languages, such as <tt>C++</tt>, ensure
that only equivalent globals are ever merged (the "one definition rule" -
"ODR"). Such languages can use the <tt>linkonce_odr</tt>
that only equivalent globals are ever merged (the "one definition rule"
&mdash; "ODR"). Such languages can use the <tt>linkonce_odr</tt>
and <tt>weak_odr</tt> linkage types to indicate that the global will only
be merged with equivalent globals. These linkage types are otherwise the
same as their non-<tt>odr</tt> versions.</dd>

3
include/llvm-c/Core.h
View File

@ -226,7 +226,8 @@ typedef enum {
LLVMExternalWeakLinkage,/**< ExternalWeak linkage description */
LLVMGhostLinkage, /**< Obsolete */
LLVMCommonLinkage, /**< Tentative definitions */
LLVMLinkerPrivateLinkage /**< Like Private, but linker removes. */
LLVMLinkerPrivateLinkage, /**< Like Private, but linker removes. */
LLVMLinkerPrivateWeakLinkage /**< Like LinkerPrivate, but is weak. */
} LLVMLinkage;
typedef enum {

17
include/llvm/GlobalValue.h
View File

@ -40,6 +40,7 @@ public:
InternalLinkage, ///< Rename collisions when linking (static functions).
PrivateLinkage, ///< Like Internal, but omit from symbol table.
LinkerPrivateLinkage, ///< Like Private, but linker removes.
LinkerPrivateWeakLinkage, ///< Like LinkerPrivate, but weak.
DLLImportLinkage, ///< Function to be imported from DLL
DLLExportLinkage, ///< Function to be accessible from DLL.
ExternalWeakLinkage,///< ExternalWeak linkage description.
@ -132,11 +133,14 @@ public:
return Linkage == PrivateLinkage;
}
static bool isLinkerPrivateLinkage(LinkageTypes Linkage) {
return Linkage==LinkerPrivateLinkage;
return Linkage == LinkerPrivateLinkage;
}
static bool isLinkerPrivateWeakLinkage(LinkageTypes Linkage) {
return Linkage == LinkerPrivateWeakLinkage;
}
static bool isLocalLinkage(LinkageTypes Linkage) {
return isInternalLinkage(Linkage) || isPrivateLinkage(Linkage) ||
isLinkerPrivateLinkage(Linkage);
isLinkerPrivateLinkage(Linkage) || isLinkerPrivateWeakLinkage(Linkage);
}
static bool isDLLImportLinkage(LinkageTypes Linkage) {
return Linkage == DLLImportLinkage;
@ -158,7 +162,8 @@ public:
return (Linkage == WeakAnyLinkage ||
Linkage == LinkOnceAnyLinkage ||
Linkage == CommonLinkage ||
Linkage == ExternalWeakLinkage);
Linkage == ExternalWeakLinkage ||
Linkage == LinkerPrivateWeakLinkage);
}
/// isWeakForLinker - Whether the definition of this global may be replaced at
@ -170,7 +175,8 @@ public:
Linkage == LinkOnceAnyLinkage ||
Linkage == LinkOnceODRLinkage ||
Linkage == CommonLinkage ||
Linkage == ExternalWeakLinkage);
Linkage == ExternalWeakLinkage ||
Linkage == LinkerPrivateWeakLinkage);
}
bool hasExternalLinkage() const { return isExternalLinkage(Linkage); }
@ -187,6 +193,9 @@ public:
bool hasInternalLinkage() const { return isInternalLinkage(Linkage); }
bool hasPrivateLinkage() const { return isPrivateLinkage(Linkage); }
bool hasLinkerPrivateLinkage() const { return isLinkerPrivateLinkage(Linkage); }
bool hasLinkerPrivateWeakLinkage() const {
return isLinkerPrivateWeakLinkage(Linkage);
}
bool hasLocalLinkage() const { return isLocalLinkage(Linkage); }
bool hasDLLImportLinkage() const { return isDLLImportLinkage(Linkage); }
bool hasDLLExportLinkage() const { return isDLLExportLinkage(Linkage); }

1
lib/AsmParser/LLLexer.cpp
View File

@ -492,6 +492,7 @@ lltok::Kind LLLexer::LexIdentifier() {
KEYWORD(private);
KEYWORD(linker_private);
KEYWORD(linker_private_weak);
KEYWORD(internal);
KEYWORD(available_externally);
KEYWORD(linkonce);

36
lib/AsmParser/LLParser.cpp
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@ -196,19 +196,20 @@ bool LLParser::ParseTopLevelEntities() {
// optional leading prefixes, the production is:
// GlobalVar ::= OptionalLinkage OptionalVisibility OptionalThreadLocal
// OptionalAddrSpace ('constant'|'global') ...
case lltok::kw_private : // OptionalLinkage
case lltok::kw_linker_private: // OptionalLinkage
case lltok::kw_internal: // OptionalLinkage
case lltok::kw_weak: // OptionalLinkage
case lltok::kw_weak_odr: // OptionalLinkage
case lltok::kw_linkonce: // OptionalLinkage
case lltok::kw_linkonce_odr: // OptionalLinkage
case lltok::kw_appending: // OptionalLinkage
case lltok::kw_dllexport: // OptionalLinkage
case lltok::kw_common: // OptionalLinkage
case lltok::kw_dllimport: // OptionalLinkage
case lltok::kw_extern_weak: // OptionalLinkage
case lltok::kw_external: { // OptionalLinkage
case lltok::kw_private: // OptionalLinkage
case lltok::kw_linker_private: // OptionalLinkage
case lltok::kw_linker_private_weak: // OptionalLinkage
case lltok::kw_internal: // OptionalLinkage
case lltok::kw_weak: // OptionalLinkage
case lltok::kw_weak_odr: // OptionalLinkage
case lltok::kw_linkonce: // OptionalLinkage
case lltok::kw_linkonce_odr: // OptionalLinkage
case lltok::kw_appending: // OptionalLinkage
case lltok::kw_dllexport: // OptionalLinkage
case lltok::kw_common: // OptionalLinkage
case lltok::kw_dllimport: // OptionalLinkage
case lltok::kw_extern_weak: // OptionalLinkage
case lltok::kw_external: { // OptionalLinkage
unsigned Linkage, Visibility;
if (ParseOptionalLinkage(Linkage) ||
ParseOptionalVisibility(Visibility) ||
@ -629,7 +630,8 @@ bool LLParser::ParseAlias(const std::string &Name, LocTy NameLoc,
Linkage != GlobalValue::WeakODRLinkage &&
Linkage != GlobalValue::InternalLinkage &&
Linkage != GlobalValue::PrivateLinkage &&
Linkage != GlobalValue::LinkerPrivateLinkage)
Linkage != GlobalValue::LinkerPrivateLinkage &&
Linkage != GlobalValue::LinkerPrivateWeakLinkage)
return Error(LinkageLoc, "invalid linkage type for alias");
Constant *Aliasee;
@ -1013,11 +1015,13 @@ bool LLParser::ParseOptionalAttrs(unsigned &Attrs, unsigned AttrKind) {
/// ::= /*empty*/
/// ::= 'private'
/// ::= 'linker_private'
/// ::= 'linker_private_weak'
/// ::= 'internal'
/// ::= 'weak'
/// ::= 'weak_odr'
/// ::= 'linkonce'
/// ::= 'linkonce_odr'
/// ::= 'available_externally'
/// ::= 'appending'
/// ::= 'dllexport'
/// ::= 'common'
@ -1030,6 +1034,9 @@ bool LLParser::ParseOptionalLinkage(unsigned &Res, bool &HasLinkage) {
default: Res=GlobalValue::ExternalLinkage; return false;
case lltok::kw_private: Res = GlobalValue::PrivateLinkage; break;
case lltok::kw_linker_private: Res = GlobalValue::LinkerPrivateLinkage; break;
case lltok::kw_linker_private_weak:
Res = GlobalValue::LinkerPrivateWeakLinkage;
break;
case lltok::kw_internal: Res = GlobalValue::InternalLinkage; break;
case lltok::kw_weak: Res = GlobalValue::WeakAnyLinkage; break;
case lltok::kw_weak_odr: Res = GlobalValue::WeakODRLinkage; break;
@ -2704,6 +2711,7 @@ bool LLParser::ParseFunctionHeader(Function *&Fn, bool isDefine) {
break;
case GlobalValue::PrivateLinkage:
case GlobalValue::LinkerPrivateLinkage:
case GlobalValue::LinkerPrivateWeakLinkage:
case GlobalValue::InternalLinkage:
case GlobalValue::AvailableExternallyLinkage:
case GlobalValue::LinkOnceAnyLinkage:

6
lib/AsmParser/LLToken.h
View File

@ -37,9 +37,9 @@ namespace lltok {
kw_declare, kw_define,
kw_global, kw_constant,
kw_private, kw_linker_private, kw_internal, kw_linkonce, kw_linkonce_odr,
kw_weak, kw_weak_odr, kw_appending, kw_dllimport, kw_dllexport, kw_common,
kw_available_externally,
kw_private, kw_linker_private, kw_linker_private_weak, kw_internal,
kw_linkonce, kw_linkonce_odr, kw_weak, kw_weak_odr, kw_appending,
kw_dllimport, kw_dllexport, kw_common, kw_available_externally,
kw_default, kw_hidden, kw_protected,
kw_extern_weak,
kw_external, kw_thread_local,

1
lib/Bitcode/Reader/BitcodeReader.cpp
View File

@ -75,6 +75,7 @@ static GlobalValue::LinkageTypes GetDecodedLinkage(unsigned Val) {
case 11: return GlobalValue::LinkOnceODRLinkage;
case 12: return GlobalValue::AvailableExternallyLinkage;
case 13: return GlobalValue::LinkerPrivateLinkage;
case 14: return GlobalValue::LinkerPrivateWeakLinkage;
}
}

1
lib/Bitcode/Writer/BitcodeWriter.cpp
View File

@ -313,6 +313,7 @@ static unsigned getEncodedLinkage(const GlobalValue *GV) {
case GlobalValue::LinkOnceODRLinkage: return 11;
case GlobalValue::AvailableExternallyLinkage: return 12;
case GlobalValue::LinkerPrivateLinkage: return 13;
case GlobalValue::LinkerPrivateWeakLinkage: return 14;
}
}

1
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
View File

@ -200,6 +200,7 @@ void AsmPrinter::EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const {
case GlobalValue::WeakAnyLinkage:
case GlobalValue::WeakODRLinkage:
case GlobalValue::LinkerPrivateLinkage:
case GlobalValue::LinkerPrivateWeakLinkage:
if (MAI->getWeakDefDirective() != 0) {
// .globl _foo
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);

2
lib/Target/CppBackend/CPPBackend.cpp
View File

@ -286,6 +286,8 @@ void CppWriter::printLinkageType(GlobalValue::LinkageTypes LT) {
Out << "GlobalValue::PrivateLinkage"; break;
case GlobalValue::LinkerPrivateLinkage:
Out << "GlobalValue::LinkerPrivateLinkage"; break;
case GlobalValue::LinkerPrivateWeakLinkage:
Out << "GlobalValue::LinkerPrivateWeakLinkage"; break;
case GlobalValue::AvailableExternallyLinkage:
Out << "GlobalValue::AvailableExternallyLinkage "; break;
case GlobalValue::LinkOnceAnyLinkage:

2
lib/Target/Mangler.cpp
View File

@ -180,7 +180,7 @@ void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
ManglerPrefixTy PrefixTy = Mangler::Default;
if (GV->hasPrivateLinkage() || isImplicitlyPrivate)
PrefixTy = Mangler::Private;
else if (GV->hasLinkerPrivateLinkage())
else if (GV->hasLinkerPrivateLinkage() || GV->hasLinkerPrivateWeakLinkage())
PrefixTy = Mangler::LinkerPrivate;
// If this global has a name, handle it simply.

1
lib/Target/XCore/AsmPrinter/XCoreAsmPrinter.cpp
View File

@ -138,7 +138,6 @@ void XCoreAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
// FALL THROUGH
case GlobalValue::InternalLinkage:
case GlobalValue::PrivateLinkage:
case GlobalValue::LinkerPrivateLinkage:
break;
case GlobalValue::DLLImportLinkage:
llvm_unreachable("DLLImport linkage is not supported by this target!");

1
lib/Transforms/IPO/MergeFunctions.cpp
View File

@ -535,6 +535,7 @@ static LinkageCategory categorize(const Function *F) {
case GlobalValue::WeakAnyLinkage:
case GlobalValue::WeakODRLinkage:
case GlobalValue::ExternalWeakLinkage:
case GlobalValue::LinkerPrivateWeakLinkage:
return ExternalWeak;
case GlobalValue::ExternalLinkage:

3
lib/VMCore/AsmWriter.cpp
View File

@ -1419,6 +1419,9 @@ static void PrintLinkage(GlobalValue::LinkageTypes LT,
case GlobalValue::ExternalLinkage: break;
case GlobalValue::PrivateLinkage: Out << "private "; break;
case GlobalValue::LinkerPrivateLinkage: Out << "linker_private "; break;
case GlobalValue::LinkerPrivateWeakLinkage:
Out << "linker_private_weak ";
break;
case GlobalValue::InternalLinkage: Out << "internal "; break;
case GlobalValue::LinkOnceAnyLinkage: Out << "linkonce "; break;
case GlobalValue::LinkOnceODRLinkage: Out << "linkonce_odr "; break;

5
lib/VMCore/Core.cpp
View File

@ -1058,6 +1058,8 @@ LLVMLinkage LLVMGetLinkage(LLVMValueRef Global) {
return LLVMPrivateLinkage;
case GlobalValue::LinkerPrivateLinkage:
return LLVMLinkerPrivateLinkage;
case GlobalValue::LinkerPrivateWeakLinkage:
return LLVMLinkerPrivateWeakLinkage;
case GlobalValue::DLLImportLinkage:
return LLVMDLLImportLinkage;
case GlobalValue::DLLExportLinkage:
@ -1108,6 +1110,9 @@ void LLVMSetLinkage(LLVMValueRef Global, LLVMLinkage Linkage) {
case LLVMLinkerPrivateLinkage:
GV->setLinkage(GlobalValue::LinkerPrivateLinkage);
break;
case LLVMLinkerPrivateWeakLinkage:
GV->setLinkage(GlobalValue::LinkerPrivateWeakLinkage);
break;
case LLVMDLLImportLinkage:
GV->setLinkage(GlobalValue::DLLImportLinkage);
break;

2
test/CodeGen/ARM/2009-08-23-linkerprivate.ll
View File

@ -2,7 +2,7 @@
; ModuleID = '/Volumes/MacOS9/tests/WebKit/JavaScriptCore/profiler/ProfilerServer.mm'
@"\01l_objc_msgSend_fixup_alloc" = linker_private hidden global i32 0, section "__DATA, __objc_msgrefs, coalesced", align 16 ; <i32*> [#uses=0]
@"\01l_objc_msgSend_fixup_alloc" = linker_private_weak hidden global i32 0, section "__DATA, __objc_msgrefs, coalesced", align 16
; CHECK: .globl l_objc_msgSend_fixup_alloc
; CHECK: .weak_definition l_objc_msgSend_fixup_alloc

2
test/CodeGen/PowerPC/2009-08-23-linkerprivate.ll
View File

@ -2,7 +2,7 @@
; ModuleID = '/Volumes/MacOS9/tests/WebKit/JavaScriptCore/profiler/ProfilerServer.mm'
@"\01l_objc_msgSend_fixup_alloc" = linker_private hidden global i32 0, section "__DATA, __objc_msgrefs, coalesced", align 16 ; <i32*> [#uses=0]
@"\01l_objc_msgSend_fixup_alloc" = linker_private_weak hidden global i32 0, section "__DATA, __objc_msgrefs, coalesced", align 16
; CHECK: .globl l_objc_msgSend_fixup_alloc
; CHECK: .weak_definition l_objc_msgSend_fixup_alloc

2
test/CodeGen/X86/2009-08-23-linkerprivate.ll
View File

@ -2,7 +2,7 @@
; ModuleID = '/Volumes/MacOS9/tests/WebKit/JavaScriptCore/profiler/ProfilerServer.mm'
@"\01l_objc_msgSend_fixup_alloc" = linker_private hidden global i32 0, section "__DATA, __objc_msgrefs, coalesced", align 16 ; <i32*> [#uses=0]
@"\01l_objc_msgSend_fixup_alloc" = linker_private_weak hidden global i32 0, section "__DATA, __objc_msgrefs, coalesced", align 16
; CHECK: .globl l_objc_msgSend_fixup_alloc
; CHECK: .weak_definition l_objc_msgSend_fixup_alloc

6
test/Feature/linker_private_linkages.ll Normal file
View File

@ -0,0 +1,6 @@
; RUN: llvm-as < %s | llvm-dis > %t1.ll
; RUN: llvm-as %t1.ll -o - | llvm-dis > %t2.ll
; RUN: diff %t1.ll %t2.ll
@foo = linker_private hidden global i32 0
@bar = linker_private_weak hidden global i32 0

3
tools/llvm-nm/llvm-nm.cpp
View File

@ -89,7 +89,8 @@ static char TypeCharForSymbol(GlobalValue &GV) {
static void DumpSymbolNameForGlobalValue(GlobalValue &GV) {
// Private linkage and available_externally linkage don't exist in symtab.
if (GV.hasPrivateLinkage() || GV.hasLinkerPrivateLinkage() ||
GV.hasAvailableExternallyLinkage()) return;
GV.hasLinkerPrivateWeakLinkage() || GV.hasAvailableExternallyLinkage())
return;
const std::string SymbolAddrStr = " "; // Not used yet...
char TypeChar = TypeCharForSymbol(GV);