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More objc2's ivar layout bitmap. 

bitmap generation for basic ivars seem to
work now. This is work in progress.

llvm-svn: 66836
This commit is contained in:
Fariborz Jahanian 2009-03-12 22:50:49 +00:00
parent 6873f9c521
commit 1bf7288529
1 changed files with 104 additions and 62 deletions
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166
clang/lib/CodeGen/CGObjCMac.cpp
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@ -424,16 +424,16 @@ protected:
/// BuildIvarLayout - Builds ivar layout bitmap for the class
/// implementation for the __strong or __weak case.
///
llvm::Constant *BuildIvarLayout(ObjCImplementationDecl *OI,
bool ForStrongLayout,
const ObjCCommonTypesHelper &ObjCTypes);
llvm::Constant *BuildIvarLayout(const ObjCImplementationDecl *OI,
bool ForStrongLayout);
void BuildAggrIvarLayout(const llvm::StructLayout *Layout,
void BuildAggrIvarLayout(const ObjCInterfaceDecl *OI,
const llvm::StructLayout *Layout,
const RecordDecl *RD,
const std::vector<FieldDecl*>& RecFields,
unsigned int BytePos, bool ForStrongLayout,
int &Index, int &SkIndex, bool &HasUnion);
/// GetIvarLayoutName - Returns a unique constant for the given
/// ivar layout bitmap.
llvm::Constant *GetIvarLayoutName(IdentifierInfo *Ident,
@ -458,6 +458,11 @@ protected:
uint64_t GetIvarBaseOffset(const llvm::StructLayout *Layout,
FieldDecl *Field);
/// GetFieldBaseOffset - return's field byt offset.
uint64_t GetFieldBaseOffset(const ObjCInterfaceDecl *OI,
const llvm::StructLayout *Layout,
FieldDecl *Field);
/// CreateMetadataVar - Create a global variable with internal
/// linkage for use by the Objective-C runtime.
///
@ -1834,6 +1839,17 @@ uint64_t CGObjCCommonMac::GetIvarBaseOffset(const llvm::StructLayout *Layout,
return offset;
}
/// GetFieldBaseOffset - return's field byt offset.
uint64_t CGObjCCommonMac::GetFieldBaseOffset(const ObjCInterfaceDecl *OI,
const llvm::StructLayout *Layout,
FieldDecl *Field) {
const ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(Field);
Field = const_cast<ObjCInterfaceDecl*>(OI)->lookupFieldDeclForIvar(
CGM.getContext(), Ivar);
uint64_t Offset = GetIvarBaseOffset(Layout, Field);
return Offset;
}
llvm::GlobalVariable *
CGObjCCommonMac::CreateMetadataVar(const std::string &Name,
llvm::Constant *Init,
@ -2480,7 +2496,8 @@ llvm::Constant *CGObjCCommonMac::GetIvarLayoutName(IdentifierInfo *Ident,
return llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy);
}
void CGObjCCommonMac::BuildAggrIvarLayout(const llvm::StructLayout *Layout,
void CGObjCCommonMac::BuildAggrIvarLayout(const ObjCInterfaceDecl *OI,
const llvm::StructLayout *Layout,
const RecordDecl *RD,
const std::vector<FieldDecl*>& RecFields,
unsigned int BytePos, bool ForStrongLayout,
@ -2494,8 +2511,11 @@ void CGObjCCommonMac::BuildAggrIvarLayout(const llvm::StructLayout *Layout,
if (RecFields.empty())
return;
if (IsUnion)
base = BytePos + GetIvarBaseOffset(Layout, RecFields[0]);
base = BytePos + GetFieldBaseOffset(OI, Layout, RecFields[0]);
unsigned WordSizeInBits = CGM.getContext().getTypeSize(
CGM.getContext().VoidPtrTy);
unsigned ByteSizeInBits = CGM.getContext().getTypeSize(
CGM.getContext().CharTy);
for (unsigned i = 0; i < RecFields.size(); i++) {
FieldDecl *Field = RecFields[i];
// Skip over unnamed or bitfields
@ -2518,8 +2538,8 @@ void CGObjCCommonMac::BuildAggrIvarLayout(const llvm::StructLayout *Layout,
e = RD->field_end(); i != e; ++i)
NestedRecFields[j++] = (*i);
// FIXME - Is Layout correct?
BuildAggrIvarLayout(Layout, RD, NestedRecFields,
BytePos + GetIvarBaseOffset(Layout, Field),
BuildAggrIvarLayout(OI, Layout, RD, NestedRecFields,
BytePos + GetFieldBaseOffset(OI, Layout, Field),
ForStrongLayout, Index, SkIndex,
HasUnion);
continue;
@ -2545,9 +2565,9 @@ void CGObjCCommonMac::BuildAggrIvarLayout(const llvm::StructLayout *Layout,
for (RecordDecl::field_iterator i = RD->field_begin(),
e = RD->field_end(); i != e; ++i)
ElementRecFields[j++] = (*i);
BuildAggrIvarLayout(Layout, RD,
BuildAggrIvarLayout(OI, Layout, RD,
ElementRecFields,
BytePos + GetIvarBaseOffset(Layout, Field),
BytePos + GetFieldBaseOffset(OI, Layout, Field),
ForStrongLayout, Index, SkIndex,
HasUnion);
// Replicate layout information for each array element. Note that
@ -2555,19 +2575,21 @@ void CGObjCCommonMac::BuildAggrIvarLayout(const llvm::StructLayout *Layout,
uint64_t ElIx = 1;
for (int FirstIndex = Index, FirstSkIndex = SkIndex;
ElIx < ElCount; ElIx++) {
uint64_t Size = CGM.getContext().getTypeSize(RT);
uint64_t Size = CGM.getContext().getTypeSize(RT)/ByteSizeInBits;
for (int i = OldIndex+1; i <= FirstIndex; ++i)
{
IvarsInfo[++Index].ivar_bytepos =
IvarsInfo[i].ivar_bytepos + Size*ElIx;
IvarsInfo[Index].ivar_size = IvarsInfo[i].ivar_size;
GC_IVAR gcivar;
gcivar.ivar_bytepos = IvarsInfo[i].ivar_bytepos + Size*ElIx;
gcivar.ivar_size = IvarsInfo[i].ivar_size;
IvarsInfo.push_back(gcivar); ++Index;
}
for (int i = OldSkIndex+1; i <= FirstSkIndex; ++i)
{
SkipIvars[++SkIndex].ivar_bytepos =
SkipIvars[i].ivar_bytepos + Size*ElIx;
SkipIvars[SkIndex].ivar_size = SkipIvars[i].ivar_size;
GC_IVAR skivar;
skivar.ivar_bytepos = SkipIvars[i].ivar_bytepos + Size*ElIx;
skivar.ivar_size = SkipIvars[i].ivar_size;
SkipIvars.push_back(skivar); ++SkIndex;
}
}
continue;
@ -2581,7 +2603,7 @@ void CGObjCCommonMac::BuildAggrIvarLayout(const llvm::StructLayout *Layout,
GCAttr = FQT.isObjCGCStrong() ? QualType::Strong : QualType::Weak;
break;
}
else if (FQT->hasObjCPointerRepresentation()) {
else if (CGM.getContext().isObjCObjectPointerType(FQT)) {
GCAttr = QualType::Strong;
break;
}
@ -2596,7 +2618,8 @@ void CGObjCCommonMac::BuildAggrIvarLayout(const llvm::StructLayout *Layout,
|| (!ForStrongLayout && GCAttr == QualType::Weak)) {
if (IsUnion)
{
uint64_t UnionIvarSize = CGM.getContext().getTypeSize(Field->getType());
uint64_t UnionIvarSize = CGM.getContext().getTypeSize(Field->getType())
/ WordSizeInBits;
if (UnionIvarSize > MaxUnionIvarSize)
{
MaxUnionIvarSize = UnionIvarSize;
@ -2605,10 +2628,11 @@ void CGObjCCommonMac::BuildAggrIvarLayout(const llvm::StructLayout *Layout,
}
else
{
IvarsInfo[++Index].ivar_bytepos =
BytePos + GetIvarBaseOffset(Layout, Field);
IvarsInfo[Index].ivar_size =
CGM.getContext().getTypeSize(Field->getType());
GC_IVAR gcivar;
gcivar.ivar_bytepos = BytePos + GetFieldBaseOffset(OI, Layout, Field);
gcivar.ivar_size = CGM.getContext().getTypeSize(Field->getType()) /
WordSizeInBits;
IvarsInfo.push_back(gcivar); ++Index;
}
}
else if ((ForStrongLayout &&
@ -2625,24 +2649,28 @@ void CGObjCCommonMac::BuildAggrIvarLayout(const llvm::StructLayout *Layout,
}
else
{
SkipIvars[++SkIndex].ivar_bytepos =
BytePos + GetIvarBaseOffset(Layout, Field);
SkipIvars[SkIndex].ivar_size =
CGM.getContext().getTypeSize(Field->getType());
GC_IVAR skivar;
skivar.ivar_bytepos = BytePos + GetFieldBaseOffset(OI, Layout, Field);
skivar.ivar_size = CGM.getContext().getTypeSize(Field->getType()) /
WordSizeInBits;
SkipIvars.push_back(skivar); ++SkIndex;
}
}
}
if (MaxField)
{
IvarsInfo[++Index].ivar_bytepos =
BytePos + GetIvarBaseOffset(Layout, MaxField);
IvarsInfo[Index].ivar_size = MaxUnionIvarSize;
GC_IVAR gcivar;
gcivar.ivar_bytepos = BytePos + GetFieldBaseOffset(OI, Layout, MaxField);
gcivar.ivar_size = MaxUnionIvarSize;
IvarsInfo.push_back(gcivar); ++Index;
}
if (MaxSkippedField)
{
SkipIvars[++SkIndex].ivar_bytepos =
BytePos + GetIvarBaseOffset(Layout, MaxSkippedField);
SkipIvars[SkIndex].ivar_size = MaxSkippedUnionIvarSize;
GC_IVAR skivar;
skivar.ivar_bytepos = BytePos +
GetFieldBaseOffset(OI, Layout, MaxSkippedField);
skivar.ivar_size = MaxSkippedUnionIvarSize;
SkipIvars.push_back(skivar); ++SkIndex;
}
return;
}
@ -2677,39 +2705,43 @@ IvarBytePosCompare (const void *a, const void *b)
/// - __weak anything
///
llvm::Constant *CGObjCCommonMac::BuildIvarLayout(
ObjCImplementationDecl *OMD,
bool ForStrongLayout,
const ObjCCommonTypesHelper &ObjCTypes) {
const ObjCImplementationDecl *OMD,
bool ForStrongLayout) {
int Index = -1;
int SkIndex = -1;
bool hasUnion = false;
int SkipScan;
unsigned int WordsToScan, WordsToSkip;
const llvm::Type *PtrTy = llvm::PointerType::getUnqual(llvm::Type::Int8Ty);
if (CGM.getLangOptions().getGCMode() == LangOptions::NonGC)
return llvm::Constant::getNullValue(PtrTy);
std::vector<FieldDecl*> RecFields;
ObjCInterfaceDecl *OI = OMD->getClassInterface();
const ObjCInterfaceDecl *OI = OMD->getClassInterface();
CGM.getContext().CollectObjCIvars(OI, RecFields);
if (RecFields.empty())
return llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy);
return llvm::Constant::getNullValue(PtrTy);
SkipIvars.clear();
IvarsInfo.clear();
const llvm::StructLayout *Layout = GetInterfaceDeclStructLayout(OI);
BuildAggrIvarLayout (Layout, 0, RecFields, 0, ForStrongLayout,
BuildAggrIvarLayout (OI, Layout, 0, RecFields, 0, ForStrongLayout,
Index, SkIndex, hasUnion);
if (Index == -1)
return llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy);
return llvm::Constant::getNullValue(PtrTy);
// Sort on byte position in case we encounterred a union nested in
// the ivar list.
if (hasUnion && Index > 0)
// FIXME - Is this correct?
qsort(&IvarsInfo[0], Index+1, sizeof(GC_IVAR), IvarBytePosCompare);
if (hasUnion && SkIndex > 0)
if (hasUnion && !IvarsInfo.empty())
qsort(&IvarsInfo[0], Index+1, sizeof(GC_IVAR), IvarBytePosCompare);
if (hasUnion && !SkipIvars.empty())
qsort(&SkipIvars[0], Index+1, sizeof(GC_IVAR), IvarBytePosCompare);
// Build the string of skip/scan nibbles
SkipScan = -1;
SkipScanIvars.clear();
unsigned int WordSize =
CGM.getTypes().getTargetData().getTypePaddedSize(ObjCTypes.Int8PtrTy);
CGM.getTypes().getTargetData().getTypePaddedSize(PtrTy);
if (IvarsInfo[0].ivar_bytepos == 0) {
WordsToSkip = 0;
WordsToScan = IvarsInfo[0].ivar_size;
@ -2718,7 +2750,7 @@ llvm::Constant *CGObjCCommonMac::BuildIvarLayout(
WordsToSkip = IvarsInfo[0].ivar_bytepos/WordSize;
WordsToScan = IvarsInfo[0].ivar_size;
}
for (int i=1; i <= Index; i++)
for (unsigned int i=1, Last=IvarsInfo.size(); i != Last; i++)
{
unsigned int TailPrevGCObjC =
IvarsInfo[i-1].ivar_bytepos + IvarsInfo[i-1].ivar_size * WordSize;
@ -2734,24 +2766,29 @@ llvm::Constant *CGObjCCommonMac::BuildIvarLayout(
continue;
// Must skip over 1 or more words. We save current skip/scan values
// and start a new pair.
SkipScanIvars[++SkipScan].skip = WordsToSkip;
SkipScanIvars[SkipScan].scan = WordsToScan;
SKIP_SCAN SkScan;
SkScan.skip = WordsToSkip;
SkScan.scan = WordsToScan;
SkipScanIvars.push_back(SkScan); ++SkipScan;
// Skip the hole.
SkipScanIvars[++SkipScan].skip =
(IvarsInfo[i].ivar_bytepos - TailPrevGCObjC) / WordSize;
SkipScanIvars[SkipScan].scan = 0;
SkScan.skip = (IvarsInfo[i].ivar_bytepos - TailPrevGCObjC) / WordSize;
SkScan.scan = 0;
SkipScanIvars.push_back(SkScan); ++SkipScan;
WordsToSkip = 0;
WordsToScan = IvarsInfo[i].ivar_size;
}
}
if (WordsToScan > 0)
{
SkipScanIvars[++SkipScan].skip = WordsToSkip;
SkipScanIvars[SkipScan].scan = WordsToScan;
SKIP_SCAN SkScan;
SkScan.skip = WordsToSkip;
SkScan.scan = WordsToScan;
SkipScanIvars.push_back(SkScan); ++SkipScan;
}
bool BytesSkipped = false;
if (SkIndex >= 0)
if (!SkipIvars.empty())
{
int LastByteSkipped =
SkipIvars[SkIndex].ivar_bytepos + SkipIvars[SkIndex].ivar_size;
@ -2762,8 +2799,10 @@ llvm::Constant *CGObjCCommonMac::BuildIvarLayout(
if (BytesSkipped)
{
unsigned int TotalWords = (LastByteSkipped + (WordSize -1)) / WordSize;
SkipScanIvars[++SkipScan].skip = TotalWords - (LastByteScanned/WordSize);
SkipScanIvars[SkipScan].scan = 0;
SKIP_SCAN SkScan;
SkScan.skip = TotalWords - (LastByteScanned/WordSize);
SkScan.scan = 0;
SkipScanIvars.push_back(SkScan); ++SkipScan;
}
}
// Mini optimization of nibbles such that an 0xM0 followed by 0x0N is produced
@ -2827,9 +2866,12 @@ llvm::Constant *CGObjCCommonMac::BuildIvarLayout(
// if ivar_layout bitmap is all 1 bits (nothing skipped) then use NULL as
// final layout.
if (ForStrongLayout && !BytesSkipped)
return llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy);
return llvm::ConstantArray::get(BitMap);
return llvm::Constant::getNullValue(PtrTy);
llvm::GlobalVariable * Entry = CreateMetadataVar("\01L_OBJC_CLASS_NAME_",
llvm::ConstantArray::get(BitMap.c_str()),
"__TEXT,__cstring,cstring_literals",
0, true);
return getConstantGEP(Entry, 0, 0);
}
llvm::Constant *CGObjCCommonMac::GetMethodVarName(Selector Sel) {
@ -3999,7 +4041,7 @@ llvm::GlobalVariable * CGObjCNonFragileABIMac::BuildClassRoTInitializer(
else
Values[ 7] = EmitIvarList(ID);
// FIXME. weakIvarLayout is currently null.
Values[ 8] = GetIvarLayoutName(0, ObjCTypes);
Values[ 8] = GetIvarLayoutName(0, ObjCTypes);
if (flags & CLS_META)
Values[ 9] = llvm::Constant::getNullValue(ObjCTypes.PropertyListPtrTy);
else