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[serialization] Sketch out struct serialization.

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This serializes structs, but not any of their members. Unfortunately, all
structs have members (the implicit constructor at the very least), so this
doesn't actually do anything at all and is completely untested.

Immediate goal: round-tripping an empty struct.

Swift SVN r5530
This commit is contained in:
Jordan Rose
2013-06-08 00:18:21 +00:00
parent c8958a232e
commit 413b2ae485
3 changed files with 83 additions and 17 deletions
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58
lib/Serialization/ModuleFile.cpp
View File

@@ -62,6 +62,25 @@ validateControlBlock(llvm::BitstreamCursor &cursor,
return result;
}
StringRef readIdentifier(llvm::BitstreamCursor &Cursor) {
// Deserialize the name.
// FIXME: Move this to an identifier table instead of a trailing record.
auto entry = Cursor.advance();
if (entry.Kind != llvm::BitstreamEntry::Record)
return {};
StringRef blobData;
SmallVector<uint64_t, 0> empty;
unsigned recordID = Cursor.readRecord(entry.ID, empty, &blobData);
if (recordID != decls_block::NAME_HACK)
return {};
assert(empty.empty() && "no data in NAME_HACK records");
assert(!blobData.empty() && "missing name in NAME_HACK record");
return blobData;
}
Decl *ModuleFile::getDecl(DeclID DID) {
if (DID == 0)
return nullptr;
@@ -81,6 +100,8 @@ Decl *ModuleFile::getDecl(DeclID DID) {
return nullptr;
}
ASTContext &ctx = ModuleContext->Ctx;
SmallVector<uint64_t, 64> scratch;
StringRef blobData;
unsigned recordID = DeclTypeCursor.readRecord(entry.ID, scratch, &blobData);
@@ -99,28 +120,39 @@ Decl *ModuleFile::getDecl(DeclID DID) {
// Deserialize the name.
// FIXME: Move this to an identifier table instead of a trailing record.
entry = DeclTypeCursor.advance();
if (entry.Kind != llvm::BitstreamEntry::Record) {
StringRef name = readIdentifier(DeclTypeCursor);
if (name.empty()) {
error();
return nullptr;
}
SmallVector<uint64_t, 0> empty;
recordID = DeclTypeCursor.readRecord(entry.ID, empty, &blobData);
if (recordID != decls_block::NAME_HACK) {
error();
return nullptr;
}
assert(empty.empty() && "no data in NAME_HACK records");
assert(!blobData.empty() && "missing name in NAME_HACK record");
ASTContext &ctx = ModuleContext->Ctx;
TypeLoc underlyingType = TypeLoc::withoutLoc(getType(underlyingTypeID));
declOrOffset = new (ctx) TypeAliasDecl(SourceLoc(),
ctx.getIdentifier(blobData),
ctx.getIdentifier(name),
SourceLoc(),
underlyingType,
ModuleContext,
{});
/*inherited=*/{});
break;
}
case decls_block::STRUCT_DECL: {
bool isImplicit;
ArrayRef<uint64_t> inheritedIDs;
decls_block::StructLayout::readRecord(scratch, isImplicit, inheritedIDs);
assert(inheritedIDs.empty() && "can't handle inherited IDs yet");
StringRef name = readIdentifier(DeclTypeCursor);
if (name.empty()) {
error();
return nullptr;
}
declOrOffset = new (ctx) StructDecl(SourceLoc(), ctx.getIdentifier(name),
SourceLoc(), /*inherited=*/{},
/*generic params=*/nullptr,
ModuleContext);
break;
}