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Add support for undef, unreachable, and function flags

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17054 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2004-10-16 18:18:16 +00:00
parent 16710e9574
commit a79e7cca0d
3 changed files with 99 additions and 36 deletions
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31
lib/Bytecode/Writer/Writer.cpp
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@ -35,7 +35,7 @@ using namespace llvm;
/// so that the reader can distinguish which format of the bytecode file has
/// been written.
/// @brief The bytecode version number
const unsigned BCVersionNum = 4;
const unsigned BCVersionNum = 5;
static RegisterPass<WriteBytecodePass> X("emitbytecode", "Bytecode Writer");
@ -294,7 +294,7 @@ void BytecodeWriter::outputConstant(const Constant *CPV) {
if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
// FIXME: Encoding of constant exprs could be much more compact!
assert(CE->getNumOperands() > 0 && "ConstantExpr with 0 operands");
output_vbr(CE->getNumOperands()); // flags as an expr
output_vbr(1+CE->getNumOperands()); // flags as an expr
output_vbr(CE->getOpcode()); // flags as an expr
for (User::const_op_iterator OI = CE->op_begin(); OI != CE->op_end(); ++OI){
@ -305,6 +305,9 @@ void BytecodeWriter::outputConstant(const Constant *CPV) {
output_typeid((unsigned)Slot);
}
return;
} else if (isa<UndefValue>(CPV)) {
output_vbr(1U); // 1 -> UndefValue constant.
return;
} else {
output_vbr(0U); // flag as not a ConstantExpr
}
@ -752,8 +755,7 @@ BytecodeWriter::BytecodeWriter(std::vector<unsigned char> &o, const Module *M)
bool hasNoEndianness = M->getEndianness() == Module::AnyEndianness;
bool hasNoPointerSize = M->getPointerSize() == Module::AnyPointerSize;
// Output the version identifier... we are currently on bytecode version #2,
// which corresponds to LLVM v1.3.
// Output the version identifier and other information.
unsigned Version = (BCVersionNum << 4) |
(unsigned)isBigEndian | (hasLongPointers << 1) |
(hasNoEndianness << 2) |
@ -851,7 +853,7 @@ void BytecodeWriter::outputConstants(bool isFunction) {
if (isFunction)
// Output the type plane before any constants!
outputTypes( Table.getModuleTypeLevel() );
outputTypes(Table.getModuleTypeLevel());
else
// Output module-level string constants before any other constants.
outputConstantStrings();
@ -898,7 +900,7 @@ void BytecodeWriter::outputModuleInfoBlock(const Module *M) {
// bit5+ = Slot # for type
unsigned oSlot = ((unsigned)Slot << 5) | (getEncodedLinkage(I) << 2) |
(I->hasInitializer() << 1) | (unsigned)I->isConstant();
output_vbr(oSlot );
output_vbr(oSlot);
// If we have an initializer, output it now.
if (I->hasInitializer()) {
@ -909,22 +911,23 @@ void BytecodeWriter::outputModuleInfoBlock(const Module *M) {
}
output_typeid((unsigned)Table.getSlot(Type::VoidTy));
// Output the types of the functions in this module...
// Output the types of the functions in this module.
for (Module::const_iterator I = M->begin(), End = M->end(); I != End; ++I) {
int Slot = Table.getSlot(I->getType());
assert(Slot != -1 && "Module const pool is broken!");
assert(Slot != -1 && "Module slot calculator is broken!");
assert(Slot >= Type::FirstDerivedTyID && "Derived type not in range!");
output_typeid((unsigned)Slot);
assert(((Slot << 5) >> 5) == Slot && "Slot # too big!");
unsigned ID = (Slot << 5) + 1;
output_vbr(ID);
}
output_typeid((unsigned)Table.getSlot(Type::VoidTy));
output_vbr((unsigned)Table.getSlot(Type::VoidTy) << 5);
// Put out the list of dependent libraries for the Module
// Emit the list of dependent libraries for the Module.
Module::lib_iterator LI = M->lib_begin();
Module::lib_iterator LE = M->lib_end();
output_vbr( unsigned(LE - LI) ); // Put out the number of dependent libraries
for ( ; LI != LE; ++LI ) {
output_vbr(unsigned(LE - LI)); // Emit the number of dependent libraries.
for (; LI != LE; ++LI)
output(*LI);
}
// Output the target triple from the module
output(M->getTargetTriple());