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[serialization] Serialize DeclContexts, VarDecls, and StructTypes.

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Unlike Clang, Swift's DeclContexts are not all Decls. However, I believe
each DeclContext that is /serialized/ will be either a decl, a
TranslationUnit, or a FuncExpr for a function with an actual declaration.
This might turn out to be wrong if (a) SIL needs proper DeclContexts for
variables in function bodies, or (b) we need to serialize anonymous
closure default arguments.

Along with an extension of the ConstructorDecl placeholder code, this allows
us to round-trip empty structs.

Swift SVN r5532
This commit is contained in:
Jordan Rose
2013-06-08 00:18:24 +00:00
parent 8bd38abdff
commit 44cde3ae0a
7 changed files with 322 additions and 28 deletions
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32
lib/Serialization/ModuleFormat.h
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@@ -45,17 +45,15 @@ enum class DeclOrType {
IsType
};
// The serialized format uses 32 bits for potential alignment benefits, even
// though bitcode is generally unaligned.
using DeclID = Fixnum<31>;
using DeclIDField = BCFixed<32>;
using DeclIDField = BCFixed<31>;
// TypeID must be the same as DeclID because it is stored in the same way.
using TypeID = DeclID;
using TypeIDField = DeclIDField;
using BitOffset = Fixnum<31>;
using BitOffsetField = BCFixed<32>;
using BitOffsetField = BCFixed<31>;
/// The various types of blocks that can occur within a serialized Swift
@@ -140,10 +138,12 @@ namespace decls_block {
enum : uint8_t {
BUILTIN_TYPE = 1,
NAME_ALIAS_TYPE,
STRUCT_TYPE,
TYPE_ALIAS_DECL = 100,
STRUCT_DECL,
CONSTRUCTOR_DECL,
VAR_DECL,
DECL_CONTEXT = 254,
NAME_HACK = 255
@@ -159,8 +159,15 @@ namespace decls_block {
DeclIDField // typealias decl
>;
using StructTypeLayout = BCRecordLayout<
STRUCT_TYPE,
DeclIDField, // struct decl
TypeIDField // parent
>;
using TypeAliasLayout = BCRecordLayout<
TYPE_ALIAS_DECL,
DeclIDField, // context decl
TypeIDField, // underlying type
BCFixed<1>, // generic flag
BCFixed<1>, // implicit flag
@@ -169,14 +176,27 @@ namespace decls_block {
using StructLayout = BCRecordLayout<
STRUCT_DECL,
DeclIDField, // context decl
BCFixed<1>, // implicit flag
BCArray<TypeIDField> // inherited types
>;
using ConstructorLayout = BCRecordLayout<
CONSTRUCTOR_DECL,
BCFixed<1>, // implicit flag
DeclIDField // implicit this decl
DeclIDField, // context decl
BCFixed<1>, // implicit flag
DeclIDField // implicit this decl
>;
using VarLayout = BCRecordLayout<
VAR_DECL,
DeclIDField, // context decl
BCFixed<1>, // implicit flag
BCFixed<1>, // never lvalue flag
TypeIDField, // type
DeclIDField, // getter
DeclIDField, // setter
DeclIDField // overridden decl
>;
using DeclContextLayout = BCRecordLayout<