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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
Download Patch File Download Diff File Expand all files Collapse all files

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
View File

@@ -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,