Changed the serialization of IdentifierTable to only serialize out entries
that are referenced in the ASTs. This assumes that we serialize out the
decls/stmts first, and use the pointer-tracking logic in the Serializer to
determine if an IdentifierInfo (or its string key) is ever referenced.
This is a significant space optimization for serialized ASTs.
Consider the following program:
void foo(int x,int y) {
return x > y ? x : y+1;
}
Here are the sizes of the files for the serialized ASTs:
Full IdentifierTable: 23676 bytes
Only-referenced Identifiers: 304 bytes.
For this simple program, this is a 77% reduction in the file size of the
serialized ASTs.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@43975 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed