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They are usually provided by clang's BackendUtil - which we don't use and which
has no support for incremental ("streaming") compilation but runs the passes on
the whole module the whole time, and does end-of-TU cleanup (e.g. "dead" code
removal) that we cannot use because subsequent transactions might create new
uses - think force_inline functions that must stay.
Instead BackendPass wraps what's in clang's BackendUtil into a
TransactionTransformer. It gets added to the IR transformers. In the future this
should only transform the delta of one Transaction instead of the whole Module.
This fixes the libc++ issue we worked around by
templates' symbols are not exported anymore and cause missing symbols with
XCode 5.1.
We include ObjC passes even though this blows up the list of linked libraries to
make it easier to port cling to ObjC(++).
*Merge PreVisitDecl and PreVisitMacro and rename to CollectFilesToUncache.
*Add FID to the transaction storing the memory buffer file ID caused the
transaction.
When executable code is generated from the llvm::Module the JIT stores the
GlobalValue, Address in a map. This map is used to 'lock' the GlobalValue, so
that it doesn't go out of sync. If we want to 'unload' it we first need to
update the global mapping so that the JIT/ExecutionEngine 'forgets' about the
mapping.
Usually the decls and stmts are linked-in through a DeclStmt. In the case of the
implicit auto keyword we cannot make the parser/sema generate a DeclStmt,
because it already has taken the path of parsing an expression. Instead we add
a DeclRefExpr referring the implicit auto declaration.
This DeclRefExpr is very important because it gives information where to
initialize the variable, i.e in which order. The implicit autofixer objective is
to find the first DeclRefExpr (there might be many) referring to the implicit
auto declaration and replace it with a proper DeclStmt.
When this oce comes from a #include through ParseForModules():
class A{} g;
A should be emitted, but not g.
This is now tested in roottest/root/meta/templateAutoload.
