Many build systems that support Swift don't use swiftc to drive the linker. To make things
easier for these build systems, also use autolinking to pull in the needed compatibility
libraries. This is less ideal than letting the driver add it at link time, since individual
compile jobs don't know whether they're building an executable or not. Introduce a
`-disable-autolink-runtime-compatibility` flag, which build systems that do drive the linker
with swiftc can pass to avoid autolinking.
rdar://problem/50057445
With the option -Xllvm -basic-dynamic-replacement the runtime functions are not called (so it works with an old swift library).
But calling the original of a replaced function is not supported in this case.
Instead of a thunk insert the dispatch into the original function.
If the original function should be executed the prolog just jumps to the "real" code in the function. Otherwise the replacement function is called.
There is one little complication here: when the replacement function calls the original function, the original function should not dispatch to the replacement again.
To pass this information, we use a flag in thread local storage.
The setting and reading of the flag is done in two new runtime functions.
rdar://problem/51043781
SR-10590 | rdar://problem/50968433 appears to be caused by an LLVM JIT bug where GOT-equivalent
globals get emitted with incorrect alignment. Not marking the GOT equivalent as unnamed_addr
(which prevents it from getting folded into the GOT, or other equivalent constants) appears
to work around the issue.
- In Sema, don't traverse nested declarations while deducing the opaque return type. This would
cause returns inside nested functions to clobber the return type of the outer function.
- In IRGen, walk the list of opaque return types we keep in the SourceFile already for type
reconstruction, instead of trying to visit them ad-hoc as part of walking the AST, since
IRGen doesn't normally walk the bodies of function decls directly.
Fixes rdar://problem/50459091
If -enable-anonymous-context-mangled-names is enabled, meaning that we assign names to
anonymous context descriptors for discovery by RemoteAST, then include opaque type descriptors
in the type metadata record table so that they can also be found at runtime by RemoteAST for
debugger support.
This is to support dynamic function replacement of functions with opaque
result type.
This approach requires that all state is thrown away (that could contain the
old returned type for an opaque type) between replacements.
rdar://48887938
To represent the abstracted interface of an opaque type, we need a generic signature that refines
the outer context generic signature with an additional generic parameter representing the underlying
type and its exposed constraints. Opaque types also need to be keyed by their originating decl, so
that we can treat values of the same opaque type as the same. When we check a FuncDecl with an
opaque type specified as its return type, create an OpaqueTypeDecl and associate it with the
originating decl. (A representation for *types* derived from the opaque decl will come next.)
Previously even if a type's metadata was optimized away, we would still
emit a field descriptor, which in turn could reference nominal type
descriptors for other types via symbolic references, etc.
Instead of a wholly separate lazyness mechanism for foreign metadata where
the first call to getAddrOfForeignTypeMetadataCandidate() would emit the
metadata, emit it using the lazy metadata mechanism.
This eliminates some code duplication. It also ensures that foreign
metadata is only emitted once per SIL module, and not once per LLVM
module, avoiding duplicate copies that must be ODR'd away in multi-threaded
mode.
This fixes the test case from <rdar://problem/49710077>.
The old logic was confusing. The LazyTypeGlobals map would contain
entries for all referenced types, even those without lazy metadata.
And for a type with lazy metadata, the IsLazy field would begin
with a value of false -- unless it was imported.
When a non-imported type was finally visited in the AST, we would
try to "enable" lazyness for it, which meant queueing up any
metadata that had been requested prior, or immediately emitting
the metadata otherwise.
Instead, let's add a separate map that caches whether a type has
lazy metadata or not. The first time we ask for the metadata of a
type, consult this map. If the type has lazy metadata according to
the map, queue up metadata emission for the type. Otherwise, emit
metadata eagerly when the type is visited in the AST.
In LLDB expressions, references to private metadata accessors may be
emitted and need to be bound to symbols available in the attached
program, even if these symbols are only supposed to have private
visibility within the program.
Also rdar://problem/48018240
COFF has a section name limit which was being exceeded. Correct the
section name to what was expected (the tests are lenient and would
accept the ELF name as well). Furthermore, ensure that the section is
emitted into the B group so that it can be collated and markers
inserted.
When emitting metadata for a Swift-defined @objc protocol that has
provided a specific Objective-C name (e.g., via @objc(renamed)),
mangle such protocols using their Objective-C names so they can be
found at runtime.
Only do this for metadata, because doing it anywhere else would cause
an ABI break. Fixes rdar://problem/47877748.
Sorting of DeclContext-local protocols and conformances shouldn't ever
be necessary, because the underlying data structures that produce
these lists should be deterministic. Sorting can hide any
non-determinism, so stop doing it and we can address the underlying
nondeterminism.
Mark the non_abi functions as weak_odr. This is needed on Windows
where the default argument generators are emitted as non-ABI functions.
These can be emitted multiple times and need to be coalesced by the
linker - that is be COMDATed as per WeakODR semantics as multiple
definitions are a hard error with PE/COFF. Use WeakODR rather than
LinkOnceODR as we want to ensure that the symbol is preserved even if
unreferenced.
Protocol descriptors for resilient protocols relatively-reference
default witness thunks, so when using -num-threads N with N > 1,
we must ensure the default witness thunk is emitted in the same
LLVM module.
Unfortunately, declarations cannot be marked with their COMDAT groups.
This fixes multithreaded IRGen where we would emit declarations for the
global initializers with COMDATs causing the IR Verifier to object. The
existing test cases cover this scenario.
Joe Groff
Joe Groff
Erik Eckstein
Arnold Schwaighofer
Slava Pestov
Doug Gregor
adrian-prantl
Adrian Prantl
Saleem Abdulrasool
Robert Widmann
Slava Pestov