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IRGen: Record start of field offset vector in StructMetadataLayout

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This commit is contained in:
Slava Pestov
2017-08-08 21:47:00 -07:00
parent f7152c0979
commit ea5a99a3f7
5 changed files with 56 additions and 67 deletions
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40
lib/IRGen/MetadataLayout.cpp
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@@ -186,6 +186,25 @@ llvm::Value *irgen::emitArgumentWitnessTableRef(IRGenFunction &IGF,
IGF.IGM.WitnessTablePtrTy);
}
Address irgen::emitAddressOfFieldOffsetVector(IRGenFunction &IGF,
llvm::Value *metadata,
NominalTypeDecl *decl) {
auto &layout = IGF.IGM.getMetadataLayout(decl);
auto offset = [&]() {
if (isa<ClassDecl>(decl)) {
return cast<ClassMetadataLayout>(layout)
.getFieldOffsetVectorOffset(IGF);
} else {
assert(isa<StructDecl>(decl));
return cast<StructMetadataLayout>(layout)
.getFieldOffsetVectorOffset();
}
}();
return IGF.emitAddressAtOffset(metadata, offset, IGF.IGM.SizeTy,
IGF.IGM.getPointerAlignment());
}
/********************************** CLASSES ***********************************/
ClassMetadataLayout::ClassMetadataLayout(IRGenModule &IGM, ClassDecl *decl)
@@ -295,16 +314,6 @@ Address irgen::emitAddressOfClassFieldOffset(IRGenFunction &IGF,
return slot;
}
Address irgen::emitAddressOfFieldOffsetVector(IRGenFunction &IGF,
llvm::Value *metadata,
ClassDecl *theClass) {
auto offset =
IGF.IGM.getMetadataLayout(theClass).getFieldOffsetVectorOffset(IGF);
return IGF.emitAddressAtOffset(metadata, offset, IGF.IGM.SizeTy,
IGF.IGM.getPointerAlignment());
}
/*********************************** ENUMS ************************************/
EnumMetadataLayout::EnumMetadataLayout(IRGenModule &IGM, EnumDecl *decl)
@@ -353,6 +362,11 @@ StructMetadataLayout::StructMetadataLayout(IRGenModule &IGM, StructDecl *decl)
super::noteStartOfGenericRequirements();
}
void noteStartOfFieldOffsets() {
Layout.FieldOffsetVector = getNextOffset();
super::noteStartOfFieldOffsets();
}
void addFieldOffset(VarDecl *field) {
Layout.FieldOffsets.try_emplace(field, getNextOffset());
super::addFieldOffset(field);
@@ -372,3 +386,9 @@ Size StructMetadataLayout::getStaticFieldOffset(VarDecl *field) const {
assert(stored.isStatic() && "resilient struct metadata layout unsupported!");
return stored.getStaticOffset();
}
Offset
StructMetadataLayout::getFieldOffsetVectorOffset() const {
assert(FieldOffsetVector.isStatic());
return Offset(FieldOffsetVector.getStaticOffset());
}