The rewrite was missing the intentional omission of `dealloc_stack`s
corresponding to `[dead_end]` `dealloc_box`es. Add the necessary
bridging to get to parity with the original.
Without this check, `dealloc_box [dead_end]`s are promoted to
`dealloc_stack`s but the memory projected out of such `alloc_box`s need
not be valid.
rdar://159271158
This allows to move many SIL APIs and utilities, which require a context, to the SIL module.
The SIL-part of SwiftPassInvocation is extracted into a base class SILContext which now lives in SIL.
Also: simplify the begin/end-pass functions of the SwiftPassInvocation.
We are going to need to add more flags to the various checked cast
instructions. Generalize the CastingIsolatedConformances bit in all of
these SIL instructions to an "options" struct that's easier to extend.
Precursor to rdar://152335805.
* Move the mutating APIs into Context.swift, because SIL can only be mutated through a MutatingContext
* move the `baseOperand` and `base` properties from the instruction classes to the `MarkDependenceInstruction` protocol
* add `valueOrAddressOperand` and `valueOrAddress` in the `MarkDependenceInstruction` protocol
Diagnostics only work with `SourceLoc` which is basically a pointer into a buffer of the loaded source file.
But when debug info is de-serialized, the SIL `Location` consists of a filename+line+column.
To "convert" this to a `SourceLoc`, the file must be loaded.
This change adds `DiagnosticEngine.getLocationFromExternalSource` for this purpose.
Also, the new protocol `ProvidingSourceLocation` - to which `SourceLoc` and `Location` conform - help to generalize the helper struct `Diagnostic` and make this "conversion" happen automatically.
It derives the address of the first element of a vector, i.e. a `Builtin.FixedArray`, from the address of the vector itself.
Addresses of other vector elements can then be derived with `index_addr`.
Add a note explaining that dependence on closure captures is not
supported. Otherwise, the diagnostics are very confusing:
"it depends on a closure capture; this is not yet supported"
* move it from the SIL to the AST module (where it belongs)
* change the signature of `diagnose` from `diagnose(location, .some_error)` to `diagnose(.some_error, at: location)`
* add an overload to allow passing a `SIL.Location` directly to `diagnose`
* add a `Diagnostic : Error` utility struct which allows throwing a `Diagnostic`
Store specialize witness tables in a separate lookup table in the module. This allows that for a normal conformance there can exist the original _and_ a specialized witness table.
Also, add a boolean property `isSpecialized` to `WitnessTable` which indicates whether the witness table is specialized or not.
