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Dana Jansens
fbc8d59d32
Introduces `Context` and `SoftContext` messages, which can be introduced
through a `ContextBuilder`:
- The `Context` messages come before the diagnostic in the output.
- The first `Context` message steals the diagnostic level from the main
diagnostic, and turns the main diagnostic into a Note attached to the
context.
- A `SoftContext` message works similarly, but if it's preceeded by a
`Context` or `SoftContext` message, then it is dropped. This can be used
as a default/backup scope when nothing more interesting is provided up
the stack, such as in `TryEvalBlockForSpecific`.
The `ContextBuilder` is provided to a callback through
`Diagnostics::ContextScope`, an RAII type `AnnotationScope` but for
context messages.
This allows a high level operation to provide a context message like
"failed to identify facet type {0}" which will then be used as the error
if a diagnostic is produced during identification, with the latter
diagnostic attached as a note to explain why the contextual operation
failed.
In particular, this allows monomorphization errors (such as an array
bound being negative) to be attached to a higher lever operation instead
of being top-level diagnostics themselves, with the monomorphization
site being a note. This inverts the source code locations that appear in
the diagnostic, so that the top-level diagnostic points to the "user
code" which causes the monomorphization.
This is presented as an alternative strategy to #6753, which plumbed
diagnoser callbacks around to achieve the same goals.
We replace the diagnoser callbacks in type completion and operators with
ContextScope callbacks instead, which now provide better diagnostics for
monomorphization errors. Other callers to MakeSpecific do not yet have
ContextScopes introduced in order to turn monomorphization errors into
more interesting diagnostics.
60 lines
2.8 KiB
C++
60 lines
2.8 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#ifndef CARBON_TOOLCHAIN_CHECK_MEMBER_ACCESS_H_
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#define CARBON_TOOLCHAIN_CHECK_MEMBER_ACCESS_H_
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#include "toolchain/check/context.h"
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#include "toolchain/sem_ir/ids.h"
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namespace Carbon::Check {
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// Returns the highest allowed access for members of `name_scope_const_id`. For
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// example, if this returns `Protected` then only `Public` and `Protected`
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// accesses are allowed -- not `Private`.
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auto GetHighestAllowedAccess(Context& context, SemIR::LocId loc_id,
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SemIR::ConstantId name_scope_const_id)
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-> SemIR::AccessKind;
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// Creates SemIR to perform a member access with base expression `base_id` and
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// member name `name_id`. When `required`, failing to find the name is a
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// diagnosed error; otherwise, `None` is returned. Returns the result of the
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// access.
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auto PerformMemberAccess(Context& context, SemIR::LocId loc_id,
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SemIR::InstId base_id, SemIR::NameId name_id,
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bool required = true) -> SemIR::InstId;
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// Creates SemIR to perform a compound member access with base expression
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// `base_id` and member name expression `member_expr_id`. Returns the result of
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// the access. If specified, `missing_impl_diagnostic_context()` is used to
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// provide context for the error diagnostic when impl binding fails due to a
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// missing `impl`.
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//
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// On failure, an ErrorInst is returned and a diagnostic is produced unless
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// `diagnose` is false. It is incorrect to specify `diagnose` as false if the
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// resulting ErrorInst may appear in the produced SemIR.
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auto PerformCompoundMemberAccess(
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Context& context, SemIR::LocId loc_id, SemIR::InstId base_id,
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SemIR::InstId member_expr_id, bool diagnose = true,
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DiagnosticContextFn missing_impl_diagnostic_context = nullptr)
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-> SemIR::InstId;
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// Finds the value of an associated entity (given by assoc_entity_inst_id, a
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// member of the interface given by interface_type_id) associated with a type or
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// facet (given by base_id). Never does instance binding.
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auto GetAssociatedValue(Context& context, SemIR::LocId loc_id,
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SemIR::InstId base_id,
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SemIR::ConstantId assoc_entity_const_id,
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SemIR::SpecificInterface interface) -> SemIR::InstId;
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// Creates SemIR to perform a tuple index with base expression `tuple_inst_id`
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// and index expression `index_inst_id`. Returns the result of the access.
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auto PerformTupleAccess(Context& context, SemIR::LocId loc_id,
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SemIR::InstId tuple_inst_id,
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SemIR::InstId index_inst_id) -> SemIR::InstId;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_MEMBER_ACCESS_H_
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