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Implement visibility checking during linking. Also implement protected

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visibility support for bitcode.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36577 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2007-04-29 20:56:48 +00:00
parent 4238d474b4
commit 9cd3ccf506
3 changed files with 18 additions and 3 deletions
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1
lib/Bitcode/Reader/BitcodeReader.cpp
View File

@ -59,6 +59,7 @@ static GlobalValue::VisibilityTypes GetDecodedVisibility(unsigned Val) {
default: // Map unknown visibilities to default.
case 0: return GlobalValue::DefaultVisibility;
case 1: return GlobalValue::HiddenVisibility;
case 2: return GlobalValue::ProtectedVisibility;
}
}

5
lib/Bitcode/Writer/BitcodeWriter.cpp
View File

@ -187,8 +187,9 @@ static unsigned getEncodedLinkage(const GlobalValue *GV) {
static unsigned getEncodedVisibility(const GlobalValue *GV) {
switch (GV->getVisibility()) {
default: assert(0 && "Invalid visibility!");
case GlobalValue::DefaultVisibility: return 0;
case GlobalValue::HiddenVisibility: return 1;
case GlobalValue::DefaultVisibility: return 0;
case GlobalValue::HiddenVisibility: return 1;
case GlobalValue::ProtectedVisibility: return 2;
}
}

15
lib/Linker/LinkModules.cpp
View File

@ -365,7 +365,9 @@ static void CopyGVAttributes(GlobalValue *DestGV, const GlobalValue *SrcGV) {
/// the result will look like in the destination module. In particular, it
/// computes the resultant linkage type, computes whether the global in the
/// source should be copied over to the destination (replacing the existing
/// one), and computes whether this linkage is an error or not.
/// one), and computes whether this linkage is an error or not. It also performs
/// visibility checks: we cannot link together two symbols with different
/// visibilities.
static bool GetLinkageResult(GlobalValue *Dest, GlobalValue *Src,
GlobalValue::LinkageTypes &LT, bool &LinkFromSrc,
std::string *Err) {
@ -435,6 +437,11 @@ static bool GetLinkageResult(GlobalValue *Dest, GlobalValue *Src,
return Error(Err, "Linking globals named '" + Src->getName() +
"': symbol multiply defined!");
}
// Check visibility
if (Dest && Src->getVisibility() != Dest->getVisibility())
return Error(Err, "Linking globals named '" + Src->getName() +
"': symbols have different visibilities!");
return false;
}
@ -617,6 +624,12 @@ static bool LinkFunctionProtos(Module *Dest, const Module *Src,
RecursiveResolveTypes(SF->getType(), DF->getType(),
&Dest->getTypeSymbolTable(), "");
}
// Check visibility
if (DF && !DF->hasInternalLinkage() &&
SF->getVisibility() != DF->getVisibility())
return Error(Err, "Linking functions named '" + SF->getName() +
"': symbols have different visibilities!");
if (DF && DF->getType() != SF->getType()) {
if (DF->isDeclaration() && !SF->isDeclaration()) {