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Infrastructure for more compact bytecode files and REAL support for versioning

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5716 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-03-06 17:55:45 +00:00
parent 6e5a0e4e89
commit 036b8aa030
2 changed files with 47 additions and 9 deletions
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46
lib/Bytecode/Reader/Reader.cpp
View File

@ -60,8 +60,12 @@ int BytecodeParser::insertValue(Value *Val, std::vector<ValueList> &ValueTab) {
if (getTypeSlot(Val->getType(), type)) return -1;
assert(type != Type::TypeTyID && "Types should never be insertValue'd!");
if (ValueTab.size() <= type)
ValueTab.resize(type+1, ValueList());
while (ValueTab.size() <= type) {
ValueTab.push_back(ValueList());
if (HasImplicitZeroInitializer) // add a zero initializer if appropriate
ValueTab.back().push_back(
Constant::getNullValue(getType(ValueTab.size()-1)));
}
//cerr << "insertValue Values[" << type << "][" << ValueTab[type].size()
// << "] = " << Val << "\n";
@ -194,8 +198,7 @@ bool BytecodeParser::ParseBasicBlock(const uchar *&Buf, const uchar *EndBuf,
while (Buf < EndBuf) {
Instruction *Inst;
if (ParseInstruction(Buf, EndBuf, Inst,
/*HACK*/BB)) {
if (ParseInstruction(Buf, EndBuf, Inst, /*HACK*/BB)) {
delete BB;
return true;
}
@ -490,6 +493,38 @@ bool BytecodeParser::ParseModuleGlobalInfo(const uchar *&Buf, const uchar *End){
return false;
}
bool BytecodeParser::ParseVersionInfo(const uchar *&Buf, const uchar *EndBuf) {
unsigned Version;
if (read_vbr(Buf, EndBuf, Version)) return true;
// Unpack version number: low four bits are for flags, top bits = version
isBigEndian = Version & 1;
hasLongPointers = Version & 2;
RevisionNum = Version >> 4;
HasImplicitZeroInitializer = true;
switch (RevisionNum) {
case 0: // Initial revision
if (Version != 14) return true; // Unknown revision 0 flags?
FirstDerivedTyID = 14;
HasImplicitZeroInitializer = false;
isBigEndian = hasLongPointers = true;
break;
case 1:
FirstDerivedTyID = 14;
break;
default:
Error = "Unknown bytecode version number!";
return true;
}
BCR_TRACE(1, "Bytecode Rev = " << (unsigned)RevisionNum << "\n");
BCR_TRACE(1, "BigEndian/LongPointers = " << isBigEndian << ","
<< hasLongPointers << "\n");
BCR_TRACE(1, "HasImplicitZeroInit = " << HasImplicitZeroInitializer << "\n");
return false;
}
bool BytecodeParser::ParseModule(const uchar *Buf, const uchar *EndBuf) {
unsigned Type, Size;
if (readBlock(Buf, EndBuf, Type, Size)) return true;
@ -502,9 +537,8 @@ bool BytecodeParser::ParseModule(const uchar *Buf, const uchar *EndBuf) {
FunctionSignatureList.clear(); // Just in case...
// Read into instance variables...
if (read_vbr(Buf, EndBuf, FirstDerivedTyID)) return true;
if (ParseVersionInfo(Buf, EndBuf)) return true;
if (align32(Buf, EndBuf)) return true;
BCR_TRACE(1, "FirstDerivedTyID = " << FirstDerivedTyID << "\n");
while (Buf < EndBuf) {
const unsigned char *OldBuf = Buf;

10
lib/Bytecode/Reader/ReaderInternals.h
View File

@ -57,6 +57,12 @@ public:
private: // All of this data is transient across calls to ParseBytecode
Module *TheModule; // Current Module being read into...
// Information about the module, extracted from the bytecode revision number.
unsigned char RevisionNum; // The rev # itself
unsigned char FirstDerivedTyID; // First variable index to use for type
bool HasImplicitZeroInitializer; // Is entry 0 of every slot implicity zeros?
bool isBigEndian, hasLongPointers;// Information about the target compiled for
typedef std::vector<Value *> ValueList;
typedef std::vector<ValueList> ValueTable;
ValueTable Values, LateResolveValues;
@ -78,9 +84,6 @@ private: // All of this data is transient across calls to ParseBytecode
TypeValuesListTy ModuleTypeValues;
TypeValuesListTy FunctionTypeValues;
// Information read from the ModuleGlobalInfo section of the file...
unsigned FirstDerivedTyID;
// When the ModuleGlobalInfo section is read, we load the type of each
// function and the 'ModuleValues' slot that it lands in. We then load a
// placeholder into its slot to reserve it. When the function is loaded, this
@ -90,6 +93,7 @@ private: // All of this data is transient across calls to ParseBytecode
private:
bool ParseModule (const uchar * Buf, const uchar *End);
bool ParseVersionInfo (const uchar *&Buf, const uchar *End);
bool ParseModuleGlobalInfo(const uchar *&Buf, const uchar *End);
bool ParseSymbolTable (const uchar *&Buf, const uchar *End, SymbolTable *);
bool ParseFunction (const uchar *&Buf, const uchar *End);