Neither order is particularly great yet, but getting them in sync will help us keep SIL.rst coverage up as we add/remove instructions in the future.
Swift SVN r6457
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
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
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
take a const ValueBase* instead of a SILValue, implement SILArgument
cases for a few visitors and opt others out explicitly, and assert
that classes in the SIL value hierarchy override their superclass's
classof.
Swift SVN r4705
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
ExistentialMethod -> ProtocolMethod for better specificity.
[De]AllocExistential -> [De]InitExistential because it doesn't necessarily allocate anything.
Swift SVN r3710
Add an instruction to represent super-to-archetype downcasts. Since archetypes are address-only, it needs to take a reference to the destination archetype as a parameter.
Swift SVN r3643
Needed to represent deinitializing a partially-initialized existential in which the value witness table has been populated by alloc_existential but the value has not been initialized yet.
Swift SVN r3565
Change over SIL Values and Instructions to work in terms of SILTypes, and update SILGen to lower types where needed. Add LValueType logic to SILType lowering to get rid of those annoying lvalue qualifiers so we can ignore RequalifyExprs. Tighten up the XFAILs in the SIL tests and disable the checks that currently crash.
Swift SVN r3538
ProjectExistential derives the value pointer from an existential, and AllocExistential initializes an existential's witness tables and allocates its value. Tweak SILGen's handling of ExistentialMemberRefExprs to emit a project_existential between querying the method and applying it.
Swift SVN r3508
Add instructions to represent type coercion and downcast conversion operations. Factor out a common ConversionInst base class for Convert and these instructions, and rename ConvertInst to ImplicitConvertInst to distinguish it from these new explicit conversion instructions.
Swift SVN r3490
Derives the address of a member from the address of a fragile value type. SIL extract : SIL element_addr :: LLVM extractvalue : LLVM getelementptr. Also add SILVerifier checks for ExtractInst and ElementAddrInst that they deal only in values and addresses, respectively.
Swift SVN r3391
Remove the AllocTmp instruction and represent MaterializeExpr allocations using 'alloc_var stack'/'dealloc_var stack' instructions. Rename Dealloc to DeallocVar, and add an AllocKind attribute to AllocVar and DeallocVar. Update MaterializeExpr SILGen to generate an AllocVar with a DeallocVar cleanup instead of AllocTmp. Tweak SILPrinter's presentation of AllocVar and DeallocVar to be in line with what SIL.rst claims.
Swift SVN r3311
Now that it's being used on both tuples and structs, the current name doesn't make much sense. SIL.rst specifies a unified set of extract/insert/gep instructions that operate on either tuples or nominal fragile structs.
Swift SVN r3303
