mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Dana Jansens
917a6ea971
Currently each interface has a `Self` facet internally that becomes a binding to every entity inside the interface: associated constants, functions, and require decls. Each of these has to be independently generic as a result. This makes is challenging in extended name lookup to move into an extended scope of an interface, as we have a specific for the interface, but the names within require a different specific that includes a `Self` facet value. We generalize this relationship by adding a second generic to Interface, called `generic_with_self`. When we want to work with entities inside the interface, we move from the interface-without-specific to the interface-with-self specific by adding a Self to the specific. This is done independently of any particular entity inside the Interface, as those entities are now all members of the interface-with-self generic. Associated constants no longer need a generic of their own, as they do not have separate generic bindings. Functions retain a generic, but if the function has no generic arguments, it will have no bindings of its own now. Require decls retain a generic so that their specific can be instantiated separately from the interface. Requiring the interface to be complete does not require the types in a require decl to be complete unless it is modified by `extend`. So we allow them to be completed later by keeping them in a separate generic. Named constraints look like interfaces and gain the additional inner generic-with-self, with the same relationship to require decls. This removes the need for name lookup to perform Substitution of a Self facet into the extended scope instruction. Instead, the `SpecificConstant` instruction inserted by a `require` decl is part of the interface-with-self generic. When looking through a FacetType for extended scopes, for each interface, we push the scope with the specific for the interface-with-self. Then the constant value of the `SpecificConstant` is correctly modified by the provided self automatically through applying that specific.
104 lines
4.0 KiB
C++
104 lines
4.0 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
|
|
// Exceptions. See /LICENSE for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
|
|
#include "toolchain/check/context.h"
|
|
|
|
#include <string>
|
|
#include <utility>
|
|
|
|
#include "common/check.h"
|
|
#include "toolchain/base/kind_switch.h"
|
|
#include "toolchain/check/deferred_definition_worklist.h"
|
|
#include "toolchain/sem_ir/ids.h"
|
|
|
|
namespace Carbon::Check {
|
|
|
|
Context::Context(DiagnosticEmitterBase* emitter,
|
|
Parse::GetTreeAndSubtreesFn tree_and_subtrees_getter,
|
|
SemIR::File* sem_ir, int imported_ir_count, int total_ir_count,
|
|
llvm::raw_ostream* vlog_stream)
|
|
: emitter_(emitter),
|
|
tree_and_subtrees_getter_(tree_and_subtrees_getter),
|
|
sem_ir_(sem_ir),
|
|
total_ir_count_(total_ir_count),
|
|
vlog_stream_(vlog_stream),
|
|
node_stack_(sem_ir->parse_tree(), vlog_stream),
|
|
inst_block_stack_("inst_block_stack_", *sem_ir, vlog_stream),
|
|
pattern_block_stack_("pattern_block_stack_", *sem_ir, vlog_stream),
|
|
param_and_arg_refs_stack_(*sem_ir, vlog_stream, node_stack_),
|
|
args_type_info_stack_("args_type_info_stack_", *sem_ir, vlog_stream),
|
|
decl_name_stack_(this),
|
|
scope_stack_(sem_ir_),
|
|
deferred_definition_worklist_(vlog_stream),
|
|
generic_region_stack_(vlog_stream),
|
|
vtable_stack_("vtable_stack_", *sem_ir, vlog_stream),
|
|
check_ir_map_(CheckIRToImpportIRStore::MakeWithExplicitSize(
|
|
total_ir_count_, SemIR::ImportIRId::None)),
|
|
global_init_(this),
|
|
region_stack_([this](SemIR::LocId loc_id, std::string label) {
|
|
TODO(loc_id, label);
|
|
}),
|
|
core_identifiers_(&identifiers()) {
|
|
// Prepare fields which relate to the number of IRs available for import.
|
|
import_irs().Reserve(imported_ir_count);
|
|
import_ir_constant_values_.reserve(imported_ir_count);
|
|
}
|
|
|
|
auto Context::TODO(SemIR::LocId loc_id, std::string label) -> bool {
|
|
CARBON_DIAGNOSTIC(SemanticsTodo, Error, "semantics TODO: `{0}`", std::string);
|
|
emitter_->Emit(loc_id, SemanticsTodo, std::move(label));
|
|
return false;
|
|
}
|
|
|
|
auto Context::TODO(SemIR::InstId loc_inst_id, std::string label) -> bool {
|
|
return TODO(SemIR::LocId(loc_inst_id), label);
|
|
}
|
|
|
|
auto Context::VerifyOnFinish() const -> void {
|
|
// Information in all the various context objects should be cleaned up as
|
|
// various pieces of context go out of scope. At this point, nothing should
|
|
// remain, so we verify stacks are empty. `node_stack_` is an exception
|
|
// because it ends containing all top-level entities.
|
|
inst_block_stack_.VerifyOnFinish();
|
|
pattern_block_stack_.VerifyOnFinish();
|
|
param_and_arg_refs_stack_.VerifyOnFinish();
|
|
args_type_info_stack_.VerifyOnFinish();
|
|
CARBON_CHECK(struct_type_fields_stack_.empty());
|
|
CARBON_CHECK(field_decls_stack_.empty());
|
|
decl_name_stack_.VerifyOnFinish();
|
|
decl_introducer_state_stack_.VerifyOnFinish();
|
|
scope_stack_.VerifyOnFinish();
|
|
generic_region_stack_.VerifyOnFinish();
|
|
vtable_stack_.VerifyOnFinish();
|
|
region_stack_.VerifyOnFinish();
|
|
CARBON_CHECK(impl_lookup_stack_.empty());
|
|
CARBON_CHECK(return_form_expr_ == std::nullopt);
|
|
|
|
#ifndef NDEBUG
|
|
if (auto verify = sem_ir_->Verify(); !verify.ok()) {
|
|
CARBON_FATAL("{0}Built invalid semantics IR: {1}\n", sem_ir_,
|
|
verify.error());
|
|
}
|
|
#endif
|
|
}
|
|
|
|
auto Context::PrintForStackDump(llvm::raw_ostream& output) const -> void {
|
|
output << "Check::Context\n";
|
|
|
|
// In a stack dump, this is probably indented by a tab. We treat that as 8
|
|
// spaces then add a couple to indent past the Context label.
|
|
constexpr int Indent = 10;
|
|
|
|
output.indent(Indent);
|
|
output << "filename: " << tokens().source().filename() << "\n";
|
|
|
|
node_stack_.PrintForStackDump(Indent, output);
|
|
inst_block_stack_.PrintForStackDump(Indent, output);
|
|
pattern_block_stack_.PrintForStackDump(Indent, output);
|
|
param_and_arg_refs_stack_.PrintForStackDump(Indent, output);
|
|
args_type_info_stack_.PrintForStackDump(Indent, output);
|
|
}
|
|
|
|
} // namespace Carbon::Check
|