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Add support for 'weak' linkage.

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For now, we translate linkonce into weak linkage in the bytecode format because
we don't have enough bits to represent it.  We will rev the bytecode version
soon anyways, so this will be fixed in the near future.

llvm-svn: 9170
This commit is contained in:
Chris Lattner 2003-10-16 18:28:50 +00:00
parent 06bd29b53b
commit 2d05c60bac
2 changed files with 25 additions and 4 deletions
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14
llvm/lib/Bytecode/Reader/Reader.cpp
View File

@ -318,7 +318,12 @@ void BytecodeParser::materializeFunction(Function* F) {
throw std::string("ParseFunction: Error reading from buffer.");
if (LinkageType & ~0x3)
throw std::string("Invalid linkage type for Function.");
Linkage = (GlobalValue::LinkageTypes)LinkageType;
switch (LinkageType) {
case 0: Linkage = GlobalValue::ExternalLinkage; break;
case 1: Linkage = GlobalValue::WeakLinkage; break;
case 2: Linkage = GlobalValue::AppendingLinkage; break;
case 3: Linkage = GlobalValue::InternalLinkage; break;
}
} else {
// We used to only support two linkage models: internal and external
unsigned isInternal;
@ -436,7 +441,12 @@ void BytecodeParser::ParseModuleGlobalInfo(const unsigned char *&Buf,
// VarType Fields: bit0 = isConstant, bit1 = hasInitializer,
// bit2,3 = Linkage, bit4+ = slot#
SlotNo = VarType >> 4;
Linkage = (GlobalValue::LinkageTypes)((VarType >> 2) & 3);
switch ((VarType >> 2) & 3) {
case 0: Linkage = GlobalValue::ExternalLinkage; break;
case 1: Linkage = GlobalValue::WeakLinkage; break;
case 2: Linkage = GlobalValue::AppendingLinkage; break;
case 3: Linkage = GlobalValue::InternalLinkage; break;
}
} else {
// VarType Fields: bit0 = isConstant, bit1 = hasInitializer,
// bit2 = isInternal, bit3+ = slot#

15
llvm/lib/Bytecode/Writer/Writer.cpp
View File

@ -158,6 +158,17 @@ void BytecodeWriter::outputConstants(bool isFunction) {
}
}
static unsigned getEncodedLinkage(const GlobalValue *GV) {
switch (GV->getLinkage()) {
default: assert(0 && "Invalid linkage!");
case GlobalValue::ExternalLinkage: return 0;
case GlobalValue::LinkOnceLinkage: return 1;
case GlobalValue::WeakLinkage: return 1;
case GlobalValue::AppendingLinkage: return 2;
case GlobalValue::InternalLinkage: return 3;
}
}
void BytecodeWriter::outputModuleInfoBlock(const Module *M) {
BytecodeBlock ModuleInfoBlock(BytecodeFormat::ModuleGlobalInfo, Out);
@ -168,7 +179,7 @@ void BytecodeWriter::outputModuleInfoBlock(const Module *M) {
// Fields: bit0 = isConstant, bit1 = hasInitializer, bit2,3=Linkage,
// bit4+ = Slot # for type
unsigned oSlot = ((unsigned)Slot << 4) | ((unsigned)I->getLinkage() << 2) |
unsigned oSlot = ((unsigned)Slot << 4) | (getEncodedLinkage(I) << 2) |
(I->hasInitializer() << 1) | I->isConstant();
output_vbr(oSlot, Out);
@ -195,7 +206,7 @@ void BytecodeWriter::outputModuleInfoBlock(const Module *M) {
void BytecodeWriter::outputFunction(const Function *F) {
BytecodeBlock FunctionBlock(BytecodeFormat::Function, Out);
output_vbr((unsigned)F->getLinkage(), Out);
output_vbr(getEncodedLinkage(F), Out);
// Only output the constant pool and other goodies if needed...
if (!F->isExternal()) {