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encode/decode function alignment in bc files

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llvm-svn: 24218
This commit is contained in:
Chris Lattner 2005-11-06 07:43:39 +00:00
parent aea08816e0
commit 6c8657e621
2 changed files with 30 additions and 24 deletions
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30
lib/Bytecode/Reader/Reader.cpp
View File

@ -1928,13 +1928,11 @@ void BytecodeReader::ParseModuleGlobalInfo() {
}
const Type *Ty = getType(SlotNo);
if (!Ty) {
if (!Ty)
error("Global has no type! SlotNo=" + utostr(SlotNo));
}
if (!isa<PointerType>(Ty)) {
if (!isa<PointerType>(Ty))
error("Global not a pointer type! Ty= " + Ty->getDescription());
}
const Type *ElTy = cast<PointerType>(Ty)->getElementType();
@ -1965,8 +1963,8 @@ void BytecodeReader::ParseModuleGlobalInfo() {
FnSignature = (FnSignature << 5) + 1;
// List is terminated by VoidTy.
while ((FnSignature >> 5) != Type::VoidTyID) {
const Type *Ty = getType(FnSignature >> 5);
while (((FnSignature & (~0U >> 1)) >> 5) != Type::VoidTyID) {
const Type *Ty = getType((FnSignature & (~0U >> 1)) >> 5);
if (!isa<PointerType>(Ty) ||
!isa<FunctionType>(cast<PointerType>(Ty)->getElementType())) {
error("Function not a pointer to function type! Ty = " +
@ -1981,7 +1979,7 @@ void BytecodeReader::ParseModuleGlobalInfo() {
// Insert the place holder.
Function* Func = new Function(FTy, GlobalValue::ExternalLinkage,
"", TheModule);
insertValue(Func, FnSignature >> 5, ModuleValues);
insertValue(Func, (FnSignature & (~0U >> 1)) >> 5, ModuleValues);
// Flags are not used yet.
unsigned Flags = FnSignature & 31;
@ -1992,13 +1990,17 @@ void BytecodeReader::ParseModuleGlobalInfo() {
if ((Flags & (1 << 4)) == 0)
FunctionSignatureList.push_back(Func);
// Look at the low bits. If there is a calling conv here, apply it,
// read it as a vbr.
Flags &= 15;
if (Flags)
Func->setCallingConv(Flags-1);
else
Func->setCallingConv(read_vbr_uint());
// Get the calling convention from the low bits.
unsigned CC = Flags & 15;
unsigned Alignment = 0;
if (FnSignature & (1 << 31)) { // Has extension word?
unsigned ExtWord = read_vbr_uint();
Alignment = (1 << (ExtWord & 31)) >> 1;
CC |= ((ExtWord >> 5) & 15) << 4;
}
Func->setCallingConv(CC);
Func->setAlignment(Alignment);
if (Handler) Handler->handleFunctionDeclaration(Func);

24
lib/Bytecode/Writer/Writer.cpp
View File

@ -949,9 +949,8 @@ void BytecodeWriter::outputModuleInfoBlock(const Module *M) {
// The extension word has this format: bit 0 = has initializer, bit 1-3 =
// linkage, bit 4-8 = alignment (log2), bits 10+ = future use.
unsigned ExtWord = I->hasInitializer() | (getEncodedLinkage(I) << 1) |
(Log2_32(I->getAlignment())+1) << 4;
((Log2_32(I->getAlignment())+1) << 4);
output_vbr(ExtWord);
}
// If we have an initializer, output it now.
@ -968,18 +967,23 @@ void BytecodeWriter::outputModuleInfoBlock(const Module *M) {
int Slot = Table.getSlot(I->getType());
assert(Slot != -1 && "Module slot calculator is broken!");
assert(Slot >= Type::FirstDerivedTyID && "Derived type not in range!");
assert(((Slot << 5) >> 5) == Slot && "Slot # too big!");
unsigned ID = (Slot << 5);
if (I->getCallingConv() < 15)
ID += I->getCallingConv()+1;
assert(((Slot << 6) >> 6) == Slot && "Slot # too big!");
unsigned ID = (Slot << 5) | (I->getCallingConv() & 15);
if (I->isExternal()) // If external, we don't have an FunctionInfo block.
ID |= 1 << 4;
if (I->getAlignment() || I->getCallingConv() & ~15)
ID |= 1 << 31; // Do we need an extension word?
output_vbr(ID);
if (I->getCallingConv() >= 15)
output_vbr(I->getCallingConv());
if (ID & (1 << 31)) {
// Extension byte: bits 0-4 = alignment, bits 5-9 = top nibble of calling
// convention.
ID = (Log2_32(I->getAlignment())+1) | ((I->getCallingConv() >> 4) << 5);
output_vbr(ID);
}
}
output_vbr((unsigned)Table.getSlot(Type::VoidTy) << 5);