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
Add RetainInst, ReleaseInst, DeallocInst for managing object lifetimes, and CopyInst and DestroyInst for indirectly managing resilient types and other non-materializable types.
Swift SVN r3159
