This was to track use of a declaration after import, prior to a
redeclaration. Per [discussion on
Discord](https://discord.com/channels/655572317891461132/1217182321933815820/1236016521059237962),
we likely don't need this check due to the change in behavior of
`extern`.
Rather than potentially getting one of many `extern` decls and depending
on it by accident, it is now planned to be _required_ to be imported,
and the library doing a non-`extern` decl must _know_ it's importing the
`extern` decl. The stricter requirement on the library means it now
seems more reasonable to use the `extern` decl.
So kind of rolling back #3831, though keeping `ImportIRInstId` (at least
for now) and keeping `Loaded`/`Unloaded` terminology (seems a nicer
fit).
This removes the builtin FunctionType, replacing it with a FunctionType
instruction. The constant for a FunctionDecl is now a StructValue with
type of FunctionType.
Note this means a function declaration produces _both_ a type, and a
value of the type. This has some consequences in terms of circularity,
and makes the importing of function declarations a little more complex.
It'll get particularly peculiar for imports because of the behavior of
the reference, but that's a known issue due to other things such as
`alias`. The impact will hopefully be contained to
ResolvePrevInstForMerge (and ImportRefs).
To note a small formatting change in diagnostics:
```
- // CHECK:STDERR: fail_member_lookup.carbon:[[@LINE+4]]:3: ERROR: Value of type `<associated <function> in Interface>` is not callable.
+ // CHECK:STDERR: fail_member_lookup.carbon:[[@LINE+4]]:3: ERROR: Value of type `<associated F in Interface>` is not callable.
- // CHECK:STDERR: fail_todo_facet_lookup.carbon:[[@LINE+4]]:3: ERROR: Value of type `<associated <function> in Interface>` is not callable.
+ // CHECK:STDERR: fail_todo_facet_lookup.carbon:[[@LINE+4]]:3: ERROR: Value of type `<associated F in Interface>` is not callable.
```
---------
Co-authored-by: Richard Smith <richard@metafoo.co.uk>
Use a level comparison during substitution to determine whether we're
substituting a particular binding. Evaluate symbolic bindings with the
same name and the same level to the same symbolic constant, for example
across redeclarations of a generic function.
Adds support for unary `-` and binary `+`, `-`, `*`, `/` for floating
point types.
Real literals are now transformed to `llvm::APFloat`s during the check
phase into the `FloatLiteral` instruction.
This PR likely collides a bit with #3892 and might need to be updated
when that one is merged.
Per offline discussion with chandlerc and jonmeow, use different
builtins for signed versus unsigned integer ops instead of looking at
the type. In this commit, the arithmetic builtins (add, sub, negate,
mul, div, mod) are split. I'll apply the same change to comparisons and
to right shift in separate PRs.
Allow an explicit `as` conversion to convert between adapters and their
adapted types. Also make the value representation of an adapter be the
same as the value representation of the adapted type so that the
conversion is always possible.
---------
Co-authored-by: josh11b <15258583+josh11b@users.noreply.github.com>
`i32` is retained as a special case for now, for bootstrapping purposes,
and maps to `BuiltinIntType`, which is distinct from `Core.Int(32)`.
This will be removed later once we support `Core.BigInt`.
For now this provides both the `iN` types and also the builtins to
support `Core.Int(N)`. The intent is that we'll change the `iN` support
to rewrite to calls here when we do that for the other type literals and
type keywords.
No conversions between integer types are supported yet, and all literals
are of type `i32`, so we can't actually form values of any of these new
types.
---------
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
Co-authored-by: Carbon Infra Bot <carbon-external-infra@google.com>
Note, my instinct is that `Float(dyn_size)` should be invalid. However,
I think the constant evaluation doesn't result in the call being
evaluated in eval.cpp when the size is non-constant. I think I could get
an error for symbolic phase calls, but that seems a little less
interesting already. Long-term maybe we want a way to mark functions as
_must_ be evaluated during constant phase?
Also, I think there may be a bug with literal value parse node
locations, I should be able to point at the position of `arg_ids[0]` but
it's missing a line number so I point at `loc` instead.
This doesn't significantly change logic, although I'm trying to add the
location to used state.
The issue I'm trying to address is how to identify a declaration as
"allowed to be redeclared". Consider:
```
library "a" api;
extern fn F();
```
```
library "b" api;
extern fn F();
```
```
library "c" api;
import library "a";
import library "b";
var x: auto = F();
fn F();
```
What currently happens is:
1. On import of "a", `F` becomes ImportRefUnused
2. On import of "b", `F` becomes ImportRefUsed in order to merge.
3. In "c", the call `F()` doesn't change the state.
4. In "c", the declaration `fn F();` needs some breadcrumb to understand
whether "F" has been referenced, as in step (3) here.
What I want to happen is:
1. On import of "a", `F` becomes ImportRefUnloaded
2. On import of "b", `F` becomes ImportRefLoaded in order to merge.
3. In "c", the call `F()` causes `F` to become ImportRefUsed
4. In "c", the declaration `fn F();` detects that `F` is already
ImportRefUsed, and can use the associated `used_id` for a diagnostic
about why redeclaring is invalid.
Note this PR isn't implementing (4). I'm focused on the refactoring to
add a new ImportRef state here.
Rename `BoolValue::FromBool` to `BoolValue::From` as requested in #3816.
Add `BoolValue::ToBool`.
Convert existing code to use these where appropriate.
In preparation for adding more builtins, factor out the handling of
builtin function kinds into separate files.
Add checking for builtin function signatures. The mechanism used here is
intended to provide a lot of flexibility for declaring generic builtin
functions and pretty arbitrary constraints on the types of parameters of
builtin functions. For now, these constraints are checked when the
builtin function is declared. The hope is that this will suffice, but if
not, it should be straightforward to switch to doing some of the
checking on call and share logic between the checks.
---------
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
Co-authored-by: Carbon Infra Bot <carbon-external-infra@google.com>
For now, a builtin function is defined by specifying a string literal
initializer in a function declaration:
```carbon
fn MyBuiltin(a: i32) -> i32 = "builtin.name";
```
End-to-end support is included for a sample `"int.add"` builtin
performing integer addition, covering constant evaluation and code
generation.
The implementation here needs substantial refactoring before we'll be
ready to start adding more builtins. That refactoring work will be
coming next. This change is aiming to checkpoint some incremental
progress.
Support is added for all overloaded operator interfaces in the current
design apart from `Assign`, which is going to require some more work to
properly handle, given that primitive assignment currently has a special
implementation for quite a few builtin types.
As we don't have support for generics yet -- in particular, generic
interfaces -- there is no support for `*With` interfaces, but homogenous
interfaces such as `Add` are supported instead.
Factor out building of call expressions so that overloaded operators can
generate calls.
Switch a few places from using specific kinds of NodeId to a general
NodeId. Because overloaded operators and other things like implicit
conversions can result in member access and function calls, those
operations can't require a specific kind of NodeId.
Add import support for associated entities, and fix import support for
interfaces and symbolic bindings. We now import interfaces in two steps,
first importing a forward declaration then a definition, just like we do
for classes. For symbolic bindings, we ensure that each BindSymbolicName
is imported only once, because its ID is used as its symbolic identity.
This is necessary because we (only) support operator interfaces that are
defined in an imported Carbon package for now.
The entire contents of `check/operator.cpp` should probably be
rethought. In particular, doing a lot of name lookups on each operator
is likely to be bad for performance. But this gets us to the point where
overloaded operators are basically working, which seems like a good
place to iterate from.
For now, the tests that the individual operators map to the right
interfaces are mostly generated by a script, but that's just because I'm
expecting a fair bit of churn in how we define the prelude and the
`impl`s -- in particular, when we add support for `AddWith`, we'll need
to update all the tests. The plan is to remove the script once things
settle down.
---------
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
Co-authored-by: Carbon Infra Bot <carbon-external-infra@google.com>
This revamps the support for cross-package imports, making them look
more like a namespace. The planned model is mentioned on
[#toolchain](https://discord.com/channels/655572317891461132/655578254970716160/1217586076022210670).
This does not implement name lookup into the new namespace structure.
A few key changes in this PR (it's a little sprawling) are:
- Moves logic for adding package imports from context.* to import.*
- Remove SemIR::Import, which was the prior model. This is instead now a
SemIR::Namespace with the NameScope getting a new import_ir_scopes
field.
- Allow SemIR::Namespace to use Parse::ImportDirectiveId in addition to
the prior Parse::NamespaceId
- The import_ir_scopes field includes a NameScopeId so that as we
traverse to child namespaces, we can directly perform name lookup in the
other IR.
- is_closed_import now tracks whether a namespace comes from a different
package. This has a diagnostic implemented in decl_name_stack.
When a member access names an interface member, perform impl lookup to
find the impl and its corresponding member.
---------
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
This was previously discussed at
https://discord.com/channels/655572317891461132/655578254970716160/1209975051588210729.
I'm initiating this mainly because we typically use "id" suffixes to
indicate an `IdBase` being passed around and the non-id suffix of
`parse_node` suggests at it carrying more data than it actually does.
There used to be more reason for avoiding `node_id` because
`SemIR::InstId` used to be named `NodeId`, but that's no longer
necessary. As a consequence, I'd like to rename `parse_node` to more
precisely reflect its type.
In full, this is doing:
```
parse_node_kind -> node_kind
parse_node -> node_id
ParseNodeCategory -> NodeCategory
ParseNodeKind -> NodeKind
ParseNode -> NodeId
```
This is primarily in check and sem_ir, but with some `parse_node_kind`
references in parse too.
Pluralization is consistent with name forms on both sides, so that
wasn't part of my replacements.
Add an instruction to hold the witness table, along with a corresponding
type to keep things simpler. Add `check/impl.{h,cpp}` to house the new
logic. No checking of impls against interfaces is performed yet.
---------
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
`Self` is modeled as a `bind_symbolic_name` with no corresponding value,
for now at least. In the future it might make sense to model it as a new
kind of instruction, or as a `bind_symbolic_name` whose value is a
`param`, but for now we just want it to introduce a symbolic constant.
In order to convert a value like the `Self` of an interface to a type, a
new instruction `facet_type_access` is introduced. This notionally
accesses the "type" field within a facet, converting it from a pair of
(type, witness) into just the type.
When declaring an associated entity in an interface -- just associated
functions for now -- create an associated entity value and corresponding
type to represent a "slot in a witness table". Also track the list of
associated entities on the interface so that we will eventually be able
to check impls against them.
Associated entities are represented as the integer index of their slot
in a witness table.
---------
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
I'm proposing a different split, along the line of "what does this
relate to". I view impl.h as having started down this route. Moving the
inst store stuff to inst.h feels odd to me given how much else is there
right now, but maybe it's still the best approach. Some files only
contain a store, no structured class, but I felt the consistency in file
naming (without _store suffixes) might help.
By adding a constant to ClassDecl/InterfaceDecl, we're able to remove
name reference special-casing. Use TryEvalInst on the Decl to generate
the Type. For ClassDecl, then use the generated constant for
self_type_id.
Adds `BindAlias` with a hybrid of `BindName` and `NameRef` semantics. I
think it's slightly closer to `BindName` because it introduces a name,
so I'm going more in that direction. This also matches the need for
`bind_name_id` with imports on enclosing scopes.
Note, only things that look like a name reference are being allowed on
the RHS of `alias`. This includes builtins that look like name
references, such as `bool`, but not ones that turn into values
underneath, such as `false`.
Note we may also want to do this with NameId, maybe some other things,
but the TypeId use is pretty broad and repetitive -- I thought I'd start
with it first.
Collect the contents of an `impl` into a scope, and start doing very
basic checking for `impl` declarations and definitions.
This change adds two new `Id` types to the set of type that `NodeStack`
supports -- `ImplId` and `NameScopeId`.
---------
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
Right now, ConstantValueStore defaults to having unknown values use
NotConstant. This generally works for the current IR, but with imports
we're expecting sparse entries which are generally unknown -- and
distinguishing between NotConstant and simply unset would be helpful. As
a consequence, add Invalid.
We discussed whether to simply have ConstantValueStore default to
Invalid going forward, or to make the default flexible. The upside to
the former is consistency, the upside to the latter is that it should
result in fewer Sets when operating on the current IR (which will more
frequently have known non-constant values). This PR offers both
approaches in separate commits, but I somewhat lean towards the latter
for fewer array resizes.
Note, a totally different approach would be to use a different class
(not ConstantValueStore) for imported IRs -- then the default of Invalid
versus NotConstant would be type-dependent. However, I expect we're
going to want to do at least somewhat consistent lookups, and using the
same ConstantValueStore for both cases allows avoiding a virtual
interface or templating. Also, I'm hoping to only maintain the
ConstantValueStore for an imported IR as part of Context (not File),
which would mean the SmallVector storage overhead is ephemeral,
mitigating one of the potential advantages of using a different type for
imported IRs.
Consume the components of the `impl` declaration, and set up scopes for
the child elements. We don't yet build a representation for the impl
itself.
Also, add an interface type value. This is necessary so that we have a
value for the expression on the right-hand side of `as` in an `impl`.
This is a bit of a cleanup; I probably should've just renamed CrossRef
instead of adding ImportRefUsed.
Adding `is_builtin` to InstId is more about providing a standard API for
the check, which I expect to add a little more of.
Shifts import tests to validate that the BuildValueRepr CHECK isn't
accidentally hit.
Recent runs of `clang-tidy` for me started showing more errors, and this
is a collection of changes to address them.
First, I've systematically applied the disabling tag to all C++ rules
under //explorer/... with `buildozer` so we don't spend time analyzing
this code or reporting errors from it. Not sure this was strictly
necessary, but it seemed like a nice consistency improvement.
Next, I disabled a buggy check for missing `default` cases in
`switch`es. It seems to get confused by the fancy conversions in our
`enum_base.h`. We don't miss much with this as the Clang compiler
warnings for `switch` catch most of our actual bugs. I also removed the
local disabling of this now that it is turned off centrally.
Lastly, I added error checking to two file descriptor manipulating calls
in the `file_test` infrastructure.
---------
Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
Builds on #3656.
Under the prior "lazy" model, we had been planning to copy instructions.
Under the current "unused+used" model, we're restricting that to
constants. I'm trimming back some of the ResolveIfImportRefUnused logic
because it was more appropriate for the former model.
Right now, I'm adding ImportRefUsed direct creation in import.cpp for
namespaces. I think I'll need to do something similar in
RseolveIfImportRefUnused... I'm still trying to think about how to
manage type information there (which needs to come in as an import
reference itself, and probably have some amount of deduplication before
forming a TypeId). So ImportRefUnused lacks a type because I'm hesitant
to aggressively load it, whereas ImportRefUsed should *always* have a
type but it's just an error while I think things through.
For reference, ImportRefUnused and ImportRefUsed are mainly split in
order to track the boolean "used" without making fundamental
modifications to Inst for bit packing (this effectively instead packs a
bit into InstKind). AnyImportRef currently excludes the type because
it's mainly for diagnostic printing at the moment. It could end up with
a TypeId that would end up Invalid for ImportRefUnused, though it could
also be that the TypeId is only accessed when using ImportRefUsed
explicitly.
This makes some changes to the formatter so that ImportRefUnused and
ImportRefUsed will both be labeled as "import_ref" with an "unused ->
used" argument change in textual IR, but is otherwise not changing
logic.
To avoid bouncing through `constant_values()` to determine whether a
type is symbolic or template, store the `ConstantId` on the `TypeInfo`
not just the `InstId`.
In addition to propagating the symbolic / template phase, this also
propagates whether a type contains an error, resulting in our no longer
producing types such as `<error>*` -- these now evaluate to simply
`<error>`. While this makes our types less precise after an error, it
also removes some follow-on diagnostics, so it seems to be an
improvement on the whole.
Do not create runtime name bindings for `FieldDecl`s even though they're
declared with `:`, so that we can still constant-evaluate references to
fields.
In array indexing, move the check for an out-of-bounds index into the
constant evaluation logic, so that we will also benefit from it when
constant evaluating a compile-time function.
In tuple indexing, require a template constant index instead of an
integer literal.
Also, form `addr_of error` instead of `addr_of operand` when `operand`
is not a reference expression, so that we don't try to constant-evaluate
a meaningless expression.
Also, expect a constant for an array bound rather than specifically an
integer literal. This allows constant evaluation results to be more
easily tested by inspecting array bounds.
The constant value we associate with an initializing representation is
the object representation that the initializing expression will store to
its destination.
Also include the type in the profile of an instruction. This is now
necessary for array values, which are represented as tuple_value
instructions with array type, to avoid instructions with different types
being merged by constant canonicalization.
Jon Ross-Perkins
Pablo Paglilla
Pablo Paglilla
Chandler CarruthandJon Ross-Perkins