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Introduce MetadataBase, a base class for MDString and MDNode.

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Derive MDString directly from MetadataBase. 
Introduce new bitcode block to hold metadata.




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76759 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2009-07-22 17:43:22 +00:00
parent dbe77cfa0b
commit e54abc90fe
16 changed files with 231 additions and 130 deletions
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63
lib/Bitcode/Reader/BitcodeReader.cpp
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@ -699,6 +699,56 @@ bool BitcodeReader::ParseValueSymbolTable() {
}
}
bool BitcodeReader::ParseMetadata() {
unsigned NextValueNo = ValueList.size();
if (Stream.EnterSubBlock(bitc::METADATA_BLOCK_ID))
return Error("Malformed block record");
SmallVector<uint64_t, 64> Record;
// Read all the records.
while (1) {
unsigned Code = Stream.ReadCode();
if (Code == bitc::END_BLOCK) {
if (Stream.ReadBlockEnd())
return Error("Error at end of PARAMATTR block");
return false;
}
if (Code == bitc::ENTER_SUBBLOCK) {
// No known subblocks, always skip them.
Stream.ReadSubBlockID();
if (Stream.SkipBlock())
return Error("Malformed block record");
continue;
}
if (Code == bitc::DEFINE_ABBREV) {
Stream.ReadAbbrevRecord();
continue;
}
// Read a record.
Record.clear();
switch (Stream.ReadRecord(Code, Record)) {
default: // Default behavior: ignore.
break;
case bitc::METADATA_STRING: {
unsigned MDStringLength = Record.size();
SmallString<8> String;
String.resize(MDStringLength);
for (unsigned i = 0; i != MDStringLength; ++i)
String[i] = Record[i];
Value *V =
Context.getMDString(String.c_str(), String.c_str() + MDStringLength);
ValueList.AssignValue(V, NextValueNo++);
break;
}
}
}
}
/// DecodeSignRotatedValue - Decode a signed value stored with the sign bit in
/// the LSB for dense VBR encoding.
static uint64_t DecodeSignRotatedValue(uint64_t V) {
@ -1028,15 +1078,6 @@ bool BitcodeReader::ParseConstants() {
AsmStr, ConstrStr, HasSideEffects);
break;
}
case bitc::CST_CODE_MDSTRING: {
unsigned MDStringLength = Record.size();
SmallString<8> String;
String.resize(MDStringLength);
for (unsigned i = 0; i != MDStringLength; ++i)
String[i] = Record[i];
V = Context.getMDString(String.c_str(), String.c_str() + MDStringLength);
break;
}
case bitc::CST_CODE_MDNODE: {
if (Record.empty() || Record.size() % 2 == 1)
return Error("Invalid CST_MDNODE record");
@ -1171,6 +1212,10 @@ bool BitcodeReader::ParseModule(const std::string &ModuleID) {
if (ParseConstants() || ResolveGlobalAndAliasInits())
return true;
break;
case bitc::METADATA_BLOCK_ID:
if (ParseMetadata())
return true;
break;
case bitc::FUNCTION_BLOCK_ID:
// If this is the first function body we've seen, reverse the
// FunctionsWithBodies list.