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Create the new linker type "linker_private_weak_def_auto".

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It's similar to "linker_private_weak", but it's known that the address of the
object is not taken. For instance, functions that had an inline definition, but
the compiler decided not to inline it. Note, unlike linker_private and
linker_private_weak, linker_private_weak_def_auto may have only default
visibility.  The symbols are removed by the linker from the final linked image
(executable or dynamic library).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111684 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2010-08-20 22:05:50 +00:00
parent 489b29b0a4
commit 55ae515f9d
15 changed files with 91 additions and 35 deletions
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10
docs/LangRef.html
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@ -25,6 +25,7 @@
<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_linker_private_weak_def_auto">'<tt>linker_private_weak_def_auto</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>
@ -557,6 +558,15 @@ define i32 @main() { <i>; i32()* </i>&nbsp;
linker. The symbols are removed by the linker from the final linked image
(executable or dynamic library).</dd>
<dt><tt><b><a name="linkage_linker_private_weak_def_auto">linker_private_weak_def_auto</a></b></tt></dt>
<dd>Similar to "<tt>linker_private_weak</tt>", but it's known that the address
of the object is not taken. For instance, functions that had an inline
definition, but the compiler decided not to inline it. Note,
unlike <tt>linker_private</tt> and <tt>linker_private_weak</tt>,
<tt>linker_private_weak_def_auto</tt> may have only <tt>default</tt>
visibility. 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
(<tt>STB_LOCAL</tt> in the case of ELF) in the object file. This

4
include/llvm-c/Core.h
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@ -227,7 +227,9 @@ typedef enum {
LLVMGhostLinkage, /**< Obsolete */
LLVMCommonLinkage, /**< Tentative definitions */
LLVMLinkerPrivateLinkage, /**< Like Private, but linker removes. */
LLVMLinkerPrivateWeakLinkage /**< Like LinkerPrivate, but is weak. */
LLVMLinkerPrivateWeakLinkage, /**< Like LinkerPrivate, but is weak. */
LLVMLinkerPrivateWeakDefAutoLinkage /**< Like LinkerPrivateWeak, but possibly
hidden. */
} LLVMLinkage;
typedef enum {

39
include/llvm/GlobalValue.h
View File

@ -41,6 +41,8 @@ public:
PrivateLinkage, ///< Like Internal, but omit from symbol table.
LinkerPrivateLinkage, ///< Like Private, but linker removes.
LinkerPrivateWeakLinkage, ///< Like LinkerPrivate, but weak.
LinkerPrivateWeakDefAutoLinkage, ///< Like LinkerPrivateWeak, but possibly
/// hidden.
DLLImportLinkage, ///< Function to be imported from DLL
DLLExportLinkage, ///< Function to be accessible from DLL.
ExternalWeakLinkage,///< ExternalWeak linkage description.
@ -137,9 +139,13 @@ public:
static bool isLinkerPrivateWeakLinkage(LinkageTypes Linkage) {
return Linkage == LinkerPrivateWeakLinkage;
}
static bool isLinkerPrivateWeakDefAutoLinkage(LinkageTypes Linkage) {
return Linkage == LinkerPrivateWeakDefAutoLinkage;
}
static bool isLocalLinkage(LinkageTypes Linkage) {
return isInternalLinkage(Linkage) || isPrivateLinkage(Linkage) ||
isLinkerPrivateLinkage(Linkage) || isLinkerPrivateWeakLinkage(Linkage);
isLinkerPrivateLinkage(Linkage) || isLinkerPrivateWeakLinkage(Linkage) ||
isLinkerPrivateWeakDefAutoLinkage(Linkage);
}
static bool isDLLImportLinkage(LinkageTypes Linkage) {
return Linkage == DLLImportLinkage;
@ -158,24 +164,26 @@ public:
/// by something non-equivalent at link time. For example, if a function has
/// weak linkage then the code defining it may be replaced by different code.
static bool mayBeOverridden(LinkageTypes Linkage) {
return (Linkage == WeakAnyLinkage ||
Linkage == LinkOnceAnyLinkage ||
Linkage == CommonLinkage ||
Linkage == ExternalWeakLinkage ||
Linkage == LinkerPrivateWeakLinkage);
return Linkage == WeakAnyLinkage ||
Linkage == LinkOnceAnyLinkage ||
Linkage == CommonLinkage ||
Linkage == ExternalWeakLinkage ||
Linkage == LinkerPrivateWeakLinkage ||
Linkage == LinkerPrivateWeakDefAutoLinkage;
}
/// isWeakForLinker - Whether the definition of this global may be replaced at
/// link time.
static bool isWeakForLinker(LinkageTypes Linkage) {
return (Linkage == AvailableExternallyLinkage ||
Linkage == WeakAnyLinkage ||
Linkage == WeakODRLinkage ||
Linkage == LinkOnceAnyLinkage ||
Linkage == LinkOnceODRLinkage ||
Linkage == CommonLinkage ||
Linkage == ExternalWeakLinkage ||
Linkage == LinkerPrivateWeakLinkage);
return Linkage == AvailableExternallyLinkage ||
Linkage == WeakAnyLinkage ||
Linkage == WeakODRLinkage ||
Linkage == LinkOnceAnyLinkage ||
Linkage == LinkOnceODRLinkage ||
Linkage == CommonLinkage ||
Linkage == ExternalWeakLinkage ||
Linkage == LinkerPrivateWeakLinkage ||
Linkage == LinkerPrivateWeakDefAutoLinkage;
}
bool hasExternalLinkage() const { return isExternalLinkage(Linkage); }
@ -195,6 +203,9 @@ public:
bool hasLinkerPrivateWeakLinkage() const {
return isLinkerPrivateWeakLinkage(Linkage);
}
bool hasLinkerPrivateWeakDefAutoLinkage() const {
return isLinkerPrivateWeakDefAutoLinkage(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

@ -493,6 +493,7 @@ lltok::Kind LLLexer::LexIdentifier() {
KEYWORD(private);
KEYWORD(linker_private);
KEYWORD(linker_private_weak);
KEYWORD(linker_private_weak_def_auto);
KEYWORD(internal);
KEYWORD(available_externally);
KEYWORD(linkonce);

9
lib/AsmParser/LLParser.cpp
View File

@ -199,6 +199,7 @@ bool LLParser::ParseTopLevelEntities() {
case lltok::kw_private: // OptionalLinkage
case lltok::kw_linker_private: // OptionalLinkage
case lltok::kw_linker_private_weak: // OptionalLinkage
case lltok::kw_linker_private_weak_def_auto: // OptionalLinkage
case lltok::kw_internal: // OptionalLinkage
case lltok::kw_weak: // OptionalLinkage
case lltok::kw_weak_odr: // OptionalLinkage
@ -623,7 +624,8 @@ bool LLParser::ParseAlias(const std::string &Name, LocTy NameLoc,
Linkage != GlobalValue::InternalLinkage &&
Linkage != GlobalValue::PrivateLinkage &&
Linkage != GlobalValue::LinkerPrivateLinkage &&
Linkage != GlobalValue::LinkerPrivateWeakLinkage)
Linkage != GlobalValue::LinkerPrivateWeakLinkage &&
Linkage != GlobalValue::LinkerPrivateWeakDefAutoLinkage)
return Error(LinkageLoc, "invalid linkage type for alias");
Constant *Aliasee;
@ -1008,6 +1010,7 @@ bool LLParser::ParseOptionalAttrs(unsigned &Attrs, unsigned AttrKind) {
/// ::= 'private'
/// ::= 'linker_private'
/// ::= 'linker_private_weak'
/// ::= 'linker_private_weak_def_auto'
/// ::= 'internal'
/// ::= 'weak'
/// ::= 'weak_odr'
@ -1029,6 +1032,9 @@ bool LLParser::ParseOptionalLinkage(unsigned &Res, bool &HasLinkage) {
case lltok::kw_linker_private_weak:
Res = GlobalValue::LinkerPrivateWeakLinkage;
break;
case lltok::kw_linker_private_weak_def_auto:
Res = GlobalValue::LinkerPrivateWeakDefAutoLinkage;
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;
@ -2718,6 +2724,7 @@ bool LLParser::ParseFunctionHeader(Function *&Fn, bool isDefine) {
case GlobalValue::PrivateLinkage:
case GlobalValue::LinkerPrivateLinkage:
case GlobalValue::LinkerPrivateWeakLinkage:
case GlobalValue::LinkerPrivateWeakDefAutoLinkage:
case GlobalValue::InternalLinkage:
case GlobalValue::AvailableExternallyLinkage:
case GlobalValue::LinkOnceAnyLinkage:

3
lib/AsmParser/LLToken.h
View File

@ -37,7 +37,8 @@ namespace lltok {
kw_declare, kw_define,
kw_global, kw_constant,
kw_private, kw_linker_private, kw_linker_private_weak, kw_internal,
kw_private, kw_linker_private, kw_linker_private_weak,
kw_linker_private_weak_def_auto, 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,

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

@ -77,6 +77,7 @@ static GlobalValue::LinkageTypes GetDecodedLinkage(unsigned Val) {
case 12: return GlobalValue::AvailableExternallyLinkage;
case 13: return GlobalValue::LinkerPrivateLinkage;
case 14: return GlobalValue::LinkerPrivateWeakLinkage;
case 15: return GlobalValue::LinkerPrivateWeakDefAutoLinkage;
}
}

31
lib/Bitcode/Writer/BitcodeWriter.cpp
View File

@ -299,21 +299,22 @@ static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) {
static unsigned getEncodedLinkage(const GlobalValue *GV) {
switch (GV->getLinkage()) {
default: llvm_unreachable("Invalid linkage!");
case GlobalValue::ExternalLinkage: return 0;
case GlobalValue::WeakAnyLinkage: return 1;
case GlobalValue::AppendingLinkage: return 2;
case GlobalValue::InternalLinkage: return 3;
case GlobalValue::LinkOnceAnyLinkage: return 4;
case GlobalValue::DLLImportLinkage: return 5;
case GlobalValue::DLLExportLinkage: return 6;
case GlobalValue::ExternalWeakLinkage: return 7;
case GlobalValue::CommonLinkage: return 8;
case GlobalValue::PrivateLinkage: return 9;
case GlobalValue::WeakODRLinkage: return 10;
case GlobalValue::LinkOnceODRLinkage: return 11;
case GlobalValue::AvailableExternallyLinkage: return 12;
case GlobalValue::LinkerPrivateLinkage: return 13;
case GlobalValue::LinkerPrivateWeakLinkage: return 14;
case GlobalValue::ExternalLinkage: return 0;
case GlobalValue::WeakAnyLinkage: return 1;
case GlobalValue::AppendingLinkage: return 2;
case GlobalValue::InternalLinkage: return 3;
case GlobalValue::LinkOnceAnyLinkage: return 4;
case GlobalValue::DLLImportLinkage: return 5;
case GlobalValue::DLLExportLinkage: return 6;
case GlobalValue::ExternalWeakLinkage: return 7;
case GlobalValue::CommonLinkage: return 8;
case GlobalValue::PrivateLinkage: return 9;
case GlobalValue::WeakODRLinkage: return 10;
case GlobalValue::LinkOnceODRLinkage: return 11;
case GlobalValue::AvailableExternallyLinkage: return 12;
case GlobalValue::LinkerPrivateLinkage: return 13;
case GlobalValue::LinkerPrivateWeakLinkage: return 14;
case GlobalValue::LinkerPrivateWeakDefAutoLinkage: return 15;
}
}

10
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
View File

@ -200,11 +200,17 @@ void AsmPrinter::EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const {
case GlobalValue::WeakAnyLinkage:
case GlobalValue::WeakODRLinkage:
case GlobalValue::LinkerPrivateWeakLinkage:
case GlobalValue::LinkerPrivateWeakDefAutoLinkage:
if (MAI->getWeakDefDirective() != 0) {
// .globl _foo
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
// .weak_definition _foo
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
if ((GlobalValue::LinkageTypes)Linkage !=
GlobalValue::LinkerPrivateWeakDefAutoLinkage)
// .weak_definition _foo
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
else
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
} else if (MAI->getLinkOnceDirective() != 0) {
// .globl _foo
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);

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

@ -288,6 +288,8 @@ void CppWriter::printLinkageType(GlobalValue::LinkageTypes LT) {
Out << "GlobalValue::LinkerPrivateLinkage"; break;
case GlobalValue::LinkerPrivateWeakLinkage:
Out << "GlobalValue::LinkerPrivateWeakLinkage"; break;
case GlobalValue::LinkerPrivateWeakDefAutoLinkage:
Out << "GlobalValue::LinkerPrivateWeakDefAutoLinkage"; break;
case GlobalValue::AvailableExternallyLinkage:
Out << "GlobalValue::AvailableExternallyLinkage "; break;
case GlobalValue::LinkOnceAnyLinkage:

3
lib/Target/Mangler.cpp
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@ -180,7 +180,8 @@ void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
ManglerPrefixTy PrefixTy = Mangler::Default;
if (GV->hasPrivateLinkage() || isImplicitlyPrivate)
PrefixTy = Mangler::Private;
else if (GV->hasLinkerPrivateLinkage() || GV->hasLinkerPrivateWeakLinkage())
else if (GV->hasLinkerPrivateLinkage() || GV->hasLinkerPrivateWeakLinkage() ||
GV->hasLinkerPrivateWeakDefAutoLinkage())
PrefixTy = Mangler::LinkerPrivate;
// If this global has a name, handle it simply.

3
lib/VMCore/AsmWriter.cpp
View File

@ -1435,6 +1435,9 @@ static void PrintLinkage(GlobalValue::LinkageTypes LT,
case GlobalValue::LinkerPrivateWeakLinkage:
Out << "linker_private_weak ";
break;
case GlobalValue::LinkerPrivateWeakDefAutoLinkage:
Out << "linker_private_weak_def_auto ";
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

@ -1069,6 +1069,8 @@ LLVMLinkage LLVMGetLinkage(LLVMValueRef Global) {
return LLVMLinkerPrivateLinkage;
case GlobalValue::LinkerPrivateWeakLinkage:
return LLVMLinkerPrivateWeakLinkage;
case GlobalValue::LinkerPrivateWeakDefAutoLinkage:
return LLVMLinkerPrivateWeakDefAutoLinkage;
case GlobalValue::DLLImportLinkage:
return LLVMDLLImportLinkage;
case GlobalValue::DLLExportLinkage:
@ -1122,6 +1124,9 @@ void LLVMSetLinkage(LLVMValueRef Global, LLVMLinkage Linkage) {
case LLVMLinkerPrivateWeakLinkage:
GV->setLinkage(GlobalValue::LinkerPrivateWeakLinkage);
break;
case LLVMLinkerPrivateWeakDefAutoLinkage:
GV->setLinkage(GlobalValue::LinkerPrivateWeakDefAutoLinkage);
break;
case LLVMDLLImportLinkage:
GV->setLinkage(GlobalValue::DLLImportLinkage);
break;

4
lib/VMCore/Verifier.cpp
View File

@ -446,6 +446,10 @@ void Verifier::visitGlobalValue(GlobalValue &GV) {
Assert1(GVar && GVar->getType()->getElementType()->isArrayTy(),
"Only global arrays can have appending linkage!", GVar);
}
Assert1(!GV.hasLinkerPrivateWeakDefAutoLinkage() || GV.hasDefaultVisibility(),
"linker_private_weak_def_auto can only have default visibility!",
&GV);
}
void Verifier::visitGlobalVariable(GlobalVariable &GV) {

1
test/Feature/linker_private_linkages.ll
View File

@ -4,3 +4,4 @@
@foo = linker_private hidden global i32 0
@bar = linker_private_weak hidden global i32 0
@qux = linker_private_weak_def_auto global i32 0