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Version 1.2 now supports encoding strings as a special case, to avoid having

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to emit all of those sbyte constants.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10863 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2004-01-14 23:35:21 +00:00
parent dcea63026f
commit 9e893e8a3d
3 changed files with 47 additions and 2 deletions
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39
lib/Bytecode/Reader/ConstantReader.cpp
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@@ -298,6 +298,42 @@ void BytecodeParser::ParseGlobalTypes(const unsigned char *&Buf,
ParseConstantPool(Buf, EndBuf, T, ModuleTypeValues);
}
void BytecodeParser::parseStringConstants(const unsigned char *&Buf,
const unsigned char *EndBuf,
unsigned NumEntries, ValueTable &Tab){
unsigned Typ;
for (; NumEntries; --NumEntries) {
if (read_vbr(Buf, EndBuf, Typ)) throw Error_readvbr;
const Type *Ty = getType(Typ);
if (!isa<ArrayType>(Ty))
throw std::string("String constant data invalid!");
const ArrayType *ATy = cast<ArrayType>(Ty);
if (ATy->getElementType() != Type::SByteTy &&
ATy->getElementType() != Type::UByteTy)
throw std::string("String constant data invalid!");
// Read character data. The type tells us how long the string is.
char Data[ATy->getNumElements()];
if (input_data(Buf, EndBuf, Data, Data+ATy->getNumElements()))
throw Error_inputdata;
std::vector<Constant*> Elements(ATy->getNumElements());
if (ATy->getElementType() == Type::SByteTy)
for (unsigned i = 0, e = ATy->getNumElements(); i != e; ++i)
Elements[i] = ConstantSInt::get(Type::SByteTy, Data[i]);
else
for (unsigned i = 0, e = ATy->getNumElements(); i != e; ++i)
Elements[i] = ConstantSInt::get(Type::UByteTy, Data[i]);
// Create the constant, inserting it as needed.
Constant *C = ConstantArray::get(ATy, Elements);
unsigned Slot = insertValue(C, Typ, Tab);
ResolveReferencesToConstant(C, Slot);
}
}
void BytecodeParser::ParseConstantPool(const unsigned char *&Buf,
const unsigned char *EndBuf,
ValueTable &Tab,
@@ -310,6 +346,9 @@ void BytecodeParser::ParseConstantPool(const unsigned char *&Buf,
if (Typ == Type::TypeTyID) {
BCR_TRACE(3, "Type: 'type' NumEntries: " << NumEntries << "\n");
parseTypeConstants(Buf, EndBuf, TypeTab, NumEntries);
} else if (Typ == Type::VoidTyID) {
assert(&Tab == &ModuleValues && "Cannot read strings in functions!");
parseStringConstants(Buf, EndBuf, NumEntries, Tab);
} else {
BCR_TRACE(3, "Type: '" << *getType(Typ) << "' NumEntries: "
<< NumEntries << "\n");