and lexical scopes, which can be enabled through the new -g option.
When -g is enabled, line tables and scopes compile all the way
down to DWARF.
Changes to SIL:
- In addition to a SILLocation, every instruction now also has a pointer
to a SILDebugScope (its containing lexical scope).
- Added LexicalScope, which is to be used for all Scopes we want to show
up in the debug info.
Swift SVN r5772
Improve our representations of casts in the AST and SIL so that 'as!' and 'is' (and eventually 'as?') can share almost all of the same type-checking, SILGen, and IRGen code.
In the AST, we now represent 'as!' and 'is' as UnconditionalCheckedCastExpr and IsaExpr, respectively, with the semantic variations of cast (downcast, super-to-archetype, archetype-to-concrete, etc.) discriminated by an enum field. This keeps the user-visible syntactic and type behavior differences of the two forms cleanly separated for AST consumers.
At the SIL level, we transpose the representation so that the different cast semantics get their own instructions and the conditional/unconditional cast behavior is indicated by an enum, making it easy for IRGen to discriminate the different code paths for the different semantics. We also add an 'IsNonnull' instruction to cover the conditional-cast-result-to-boolean conversion common to all the forms of 'is'.
The upshot of all this is that 'x is T' now works for all the new archetype and existential cast forms supported by 'as!'.
Swift SVN r5737
Treat archetypes with a superclass bound as class-bounded. Change SILGen and IRGen to use the new SuperToArchetypeRef and ArchetypeRefToSuper cast instructions, and drop the old SuperToArchetype and ArchetypeToSuper instructions, which are unneeded because any archetype with a superclass will be class-bounded.
Note that this patch doesn't implement representation optimization for archetypes with superclass bounds--they're still always represented with a worst-case UnknownRefCountedPtrTy.
Swift SVN r5629
Add class-bound versions of archetype conversion and existential creation/projection/conversion instructions. Since class-bound generics aren't address-only these instruction variants don't need to indirect through addresses.
Swift SVN r5554
Add an index_raw_pointer instruction that acts like index_addr but for RawPointers, and use it to lower Builtin.gep into SIL instead of into IR.
Swift SVN r5479
Delete the non-placement operator new/delete in the SILAllocated CRTP base so that the compiler saves us from accidentally allocating and leaking SILInstructions on the main heap instead of the owning SILModule's BPA.
Swift SVN r5468
Split ExtractInst and ElementAddrInst into separate Tuple and Struct versions, and have the Struct versions reference struct member VarDecls directly instead of integer indices.
Swift SVN r5215
Make IntegerLiteral, FloatLiteral, and StringLiteral own their own copies of their values so they don't depend on the AST. Remove the now-redundant IntegerValueInst, which only existed to be a non-AST-dependent variant of IntegerLiteral.
Swift SVN r5045
We don't want to have to recover from a mangled name whether a function call is to an IRGen-lowered builtin, so add an instruction for referencing builtins.
Swift SVN r4919
Move AbstractCC into SILType and make it an attribute of SILTypes for functions. Add a ConvertCCInst to represent calling convention conversions. Give SILFunctions a linkage attribute. Add logic to SILGen to calculate these attributes for SILConstants based on their attached decls.
IRGen doesn't use these new attributes yet. I'll hook that up when I move mangling over.
Swift SVN r4886
Replace 'constant_ref' with 'function_ref', which references a SILFunction directly, and 'global_addr', which references a global variable VarDecl. Get rid of the SILConstant-to-SILFunction mapping in SILModule and replace it with an ilist of SILFunctions. Allow SILFunctions to be 'external' by not having any blocks in their body.
For now, SILFunctions still carry around their SILConstant "name", because name mangling and IRGen still rely on access to the original decl in order to recover IRGen information, which unfortunately leaves IRGen's CodeRefs in a gross, awkward intermediate state. Lifting mangling, AbstractCC, and other linkage attributes to SIL should clear up this up.
Swift SVN r4865
The value semantics primitives load/move/assign/init/destroy lower trivially to SIL value semantics operators, and the bridge casting operations introduce r/r semantics that should be visible to the ARC optimizer, so move the lowering for these builtins up to SILGen. Add a BUILTIN_SIL_OPERATION metaprogramming macro to Builtins.def, and add a facility similar to IRGen's former SpecializedCallEmission so we can handle builtin call emissions as special cases.
This also sets up the framework for eventually reintroducing special-case handling of known functions like &&, ||, Bool.getLogicValue, Int.convertFromIntegerLiteral, etc. in SILGen.
Swift SVN r4862
Add an IsaInst to represent type tests, and implement SILGen for IsSubtypeExpr AST nodes. Get rid of SuperIsArchetypeExpr because it's not really necessary to have it different from IsaSubtype--the SIL and IR behavior is identical.
Swift SVN r4855
Create a UnaryInstructionBase that factors all the boilerplate out of all the unary instructions. It'll be easy to generalize to all fixed-arity instructions, but let's start simple. No functionality change.
Swift SVN r4854
Teach SILGen how to emit the implicit elementwise constructor for structs and the implicit default constructor for classes, and eliminate the now dead IRGen code for them. Add a StructInst SIL instruction to represent constructing a loadable struct value from elements, analogous to TupleInst for tuples.
Swift SVN r4778
Otherwise we try to release junk pointers when we reassign class fields in the struct. Add an attribute to InitializeVarInst so that when dataflow analysis comes online, it knows that these InitializeVars need to be eliminated and can't be lowered to default constructor calls (since we're already in a constructor).
Swift SVN r4730
The Verifier wasn't actually verifying function bodies, because I neglected to visit the actual basic blocks after checking the entry point arguments in verifySILFunction. This revealed a SILType identity issue where TypeConverter::getLoweredType and SILType::getEmptyTupleType returned non-identical SILTypes for the empty tuple type; fix that by removing SILType::getEmptyTupleType, moving TypeConverter into SILModule, and forcing all SILType creation through TypeConverter.
Swift SVN r4616
Archetype and protocol 'x.metatype' expressions eventually need to do a dynamic lookup, like 'x.metatype' for classes. These instructions represent that lookup.
Swift SVN r4534
All the other implicit conversions have been given their own instructions, so specialize this ill-specified instruction to its one remaining use, for converting compatible function types.
Swift SVN r4482
Swift doesn't yet type-check function thinness, so variables, arguments, and return values are always thick. When we store, pass as argument, or return a function value that SIL tracks as thin, emit a new 'thin_to_thick_function' instruction to represent converting the type to the thick type and adding a null context pointer.
Swift SVN r4470
Make converting a SIL address to a Builtin.RawPointer its own instruction separate from implicit_convert, which will let me get rid of a goofy edge case in IRGenSIL.
Swift SVN r4412
Reference and call uncurried function applications when appropriate to the call site, following the same logic implemented in CallEmission/CalleeSource in IRGen. Add ClassMethodInst and SuperMethodInst instructions to represent method and super dispatch. Change how closures and ClosureInst are represented in SIL so that closures are functions with an extra implicit uncurry level and so that ClosureInst applies the outer uncurries of an uncurried function type to give a curried type as a result. This breaks...pretty much everything else SIL-dependent; I'll clean it up next.
Swift SVN r4368
Rename 'ZeroAddr' to 'InitializeVar' and remove ZeroValue since only things with memory locations should ever be in a 'default-initialize' state. Add a ModuleInst so we don't need to use ZeroValue as a hack to represent ModuleExpr values.
Swift SVN r4319
Converting from a protocol type to a more general protocol type is different at the implementation level from converting a concrete type to a protocol type, since the witness tables and concrete value can be copied directly from the original existential container to the new without adding another indirection. This instruction represents that operation.
Swift SVN r3887
Upcasting isn't quite a no-op like the other implicit conversions because the underlying pointer type still needs to be bitcast. The additional semantic information will be useful for SIL consumers as well.
Swift SVN r3872
I was being lazy by not mangling the context arguments onto the types of closure SIL constants and then having ClosureInst pass the type of its callee through T -> T. Now closure functions get emitted with the right types, ClosureInst properly partially applies the type, and the SIL Verifier properly checks that the argument types all line up correctly.
Swift SVN r3815
This is inconsistent with ElementAddr and Extract, but allows all the hairy logic of accessing class fields in IRGen to stand without a bunch of pointless refactoring.
Swift SVN r3778
