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IR: Don't allow non-default visibility on local linkage

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Visibilities of `hidden` and `protected` are meaningless for symbols
with local linkage.

  - Change the assembler to reject non-default visibility on symbols
    with local linkage.

  - Change the bitcode reader to auto-upgrade `hidden` and `protected`
    to `default` when the linkage is local.

  - Update LangRef.

<rdar://problem/16141113>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208263 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2014-05-07 22:57:20 +00:00
parent c7e175a743
commit 76c17d324c
23 changed files with 199 additions and 25 deletions
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17
lib/AsmParser/LLParser.cpp
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@ -622,6 +622,11 @@ bool LLParser::ParseStandaloneMetadata() {
return false;
}
static bool isValidVisibilityForLinkage(unsigned V, unsigned L) {
return !GlobalValue::isLocalLinkage((GlobalValue::LinkageTypes)L) ||
(GlobalValue::VisibilityTypes)V == GlobalValue::DefaultVisibility;
}
/// ParseAlias:
/// ::= GlobalVar '=' OptionalVisibility OptionalDLLStorageClass 'alias'
/// OptionalLinkage Aliasee
@ -646,6 +651,10 @@ bool LLParser::ParseAlias(const std::string &Name, LocTy NameLoc,
if(!GlobalAlias::isValidLinkage(Linkage))
return Error(LinkageLoc, "invalid linkage type for alias");
if (!isValidVisibilityForLinkage(Visibility, L))
return Error(LinkageLoc,
"symbol with local linkage must have default visibility");
Constant *Aliasee;
LocTy AliaseeLoc = Lex.getLoc();
if (Lex.getKind() != lltok::kw_bitcast &&
@ -714,6 +723,10 @@ bool LLParser::ParseAlias(const std::string &Name, LocTy NameLoc,
bool LLParser::ParseGlobal(const std::string &Name, LocTy NameLoc,
unsigned Linkage, bool HasLinkage,
unsigned Visibility, unsigned DLLStorageClass) {
if (!isValidVisibilityForLinkage(Visibility, Linkage))
return Error(NameLoc,
"symbol with local linkage must have default visibility");
unsigned AddrSpace;
bool IsConstant, UnnamedAddr, IsExternallyInitialized;
GlobalVariable::ThreadLocalMode TLM;
@ -3014,6 +3027,10 @@ bool LLParser::ParseFunctionHeader(Function *&Fn, bool isDefine) {
return Error(LinkageLoc, "invalid function linkage type");
}
if (!isValidVisibilityForLinkage(Visibility, Linkage))
return Error(LinkageLoc,
"symbol with local linkage must have default visibility");
if (!FunctionType::isValidReturnType(RetType))
return Error(RetTypeLoc, "invalid function return type");