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Changes to the V2 bytecode format:

Browse Source 
- Null values are implicitly encoded instead of explicitly, this makes
    things more compact!
  - More compactly represent ConstantPointerRefs
  - Bytecode files are represented as:
      Header|GlobalTypes|GlobalVars/Function Protos|Constants|Functions|SymTab
    instead of
      Header|GlobalTypes|Constants|GlobalVars/Function Protos|Functions|SymTab
    which makes a lot of things simpler.

Writer changes:
  - We now explictly encode versioning information in the bytecode files.
  - This allows new code to read bytecode files produced by old code, but
    new bytecode files can have enhancements such as the above.  Although this
    makes the reader a bit more complex (having to deal with old formats), the
    writer only needs to be able to produce the most recent version.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5749 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2003-03-19 20:56:46 +00:00
parent 52e20b0977
commit 186a1f71e6
3 changed files with 54 additions and 48 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Bytecode/Writer/ConstantWriter.cpp
+14 -20
View File
@@ -13,8 +13,6 @@
#include "llvm/Constants.h"
#include "llvm/SymbolTable.h"
#include "llvm/DerivedTypes.h"
#include <iostream>
using std::cerr;
void BytecodeWriter::outputType(const Type *T) {
output_vbr((unsigned)T->getPrimitiveID(), Out);
@@ -52,7 +50,7 @@ void BytecodeWriter::outputType(const Type *T) {
int Slot = Table.getValSlot(AT->getElementType());
assert(Slot != -1 && "Type used but not available!!");
output_vbr((unsigned)Slot, Out);
//cerr << "Type slot = " << Slot << " Type = " << T->getName() << endl;
//std::cerr << "Type slot = " << Slot << " Type = " << T->getName() << endl;
output_vbr(AT->getNumElements(), Out);
break;
@@ -89,13 +87,15 @@ void BytecodeWriter::outputType(const Type *T) {
//case Type::PackedTyID:
default:
cerr << __FILE__ << ":" << __LINE__ << ": Don't know how to serialize"
<< " Type '" << T->getDescription() << "'\n";
std::cerr << __FILE__ << ":" << __LINE__ << ": Don't know how to serialize"
<< " Type '" << T->getDescription() << "'\n";
break;
}
}
bool BytecodeWriter::outputConstant(const Constant *CPV) {
assert((CPV->getType()->isPrimitiveType() || !CPV->isNullValue()) &&
"Shouldn't output null constants!");
// We must check for a ConstantExpr before switching by type because
// a ConstantExpr can be of any type, and has no explicit value.
@@ -121,9 +121,9 @@ bool BytecodeWriter::outputConstant(const Constant *CPV) {
switch (CPV->getType()->getPrimitiveID()) {
case Type::BoolTyID: // Boolean Types
if (cast<const ConstantBool>(CPV)->getValue())
output_vbr((unsigned)1, Out);
output_vbr(1U, Out);
else
output_vbr((unsigned)0, Out);
output_vbr(0U, Out);
break;
case Type::UByteTyID: // Unsigned integer types...
@@ -171,17 +171,11 @@ bool BytecodeWriter::outputConstant(const Constant *CPV) {
case Type::PointerTyID: {
const ConstantPointer *CPP = cast<const ConstantPointer>(CPV);
if (isa<ConstantPointerNull>(CPP)) {
output_vbr((unsigned)0, Out);
} else if (const ConstantPointerRef *CPR =
dyn_cast<ConstantPointerRef>(CPP)) {
output_vbr((unsigned)1, Out);
int Slot = Table.getValSlot((Value*)CPR->getValue());
assert(Slot != -1 && "Global used but not available!!");
output_vbr((unsigned)Slot, Out);
} else {
assert(0 && "Unknown ConstantPointer Subclass!");
}
assert(!isa<ConstantPointerNull>(CPP) && "Null should be already emitted!");
const ConstantPointerRef *CPR = cast<ConstantPointerRef>(CPP);
int Slot = Table.getValSlot((Value*)CPR->getValue());
assert(Slot != -1 && "Global used but not available!!");
output_vbr((unsigned)Slot, Out);
break;
}
@@ -199,8 +193,8 @@ bool BytecodeWriter::outputConstant(const Constant *CPV) {
case Type::VoidTyID:
case Type::LabelTyID:
default:
cerr << __FILE__ << ":" << __LINE__ << ": Don't know how to serialize"
<< " type '" << CPV->getType()->getName() << "'\n";
std::cerr << __FILE__ << ":" << __LINE__ << ": Don't know how to serialize"
<< " type '" << CPV->getType()->getName() << "'\n";
break;
}
return false;