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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
db324c7247
This doesn't actually track whether a declaration is `extern`. It does, however: - Factor out and expand merge support for classes, sharing handling with functions. - This makes the ClassRedefinition diagnostic redundant, as the redeclaration checking overlaps. - Add partial `extern` handling to class handling; just some verifications of correct use. - Factor out `extern` on member handling for sharing with `fn`. - Fixes a bug in import_ref where a class's definition_id wasn't assigned when defining. This changes how a redefinition is handled (replaced, rather than merged). I don't know whether that's ideal, but I think it results in easy-to-understand consequences, and it's more consistent with how `fn` works. There's enough work here that this felt like a decent cut point, particularly as the amount of work to actually add `extern` tracking will be significant.
60 lines
2.6 KiB
C++
60 lines
2.6 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_FUNCTION_H_
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#define CARBON_TOOLCHAIN_CHECK_FUNCTION_H_
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#include "toolchain/check/context.h"
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#include "toolchain/check/decl_name_stack.h"
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#include "toolchain/check/subst.h"
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#include "toolchain/sem_ir/function.h"
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#include "toolchain/sem_ir/ids.h"
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namespace Carbon::Check {
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// State saved for a function definition that has been suspended after
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// processing its declaration and before processing its body. This is used for
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// inline method handling.
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struct SuspendedFunction {
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// The function that was declared.
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SemIR::FunctionId function_id;
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// The instruction ID of the FunctionDecl instruction.
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SemIR::InstId decl_id;
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// The declaration name information of the function. This includes the scope
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// information, such as parameter names.
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DeclNameStack::SuspendedName saved_name_state;
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};
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// Checks that `new_function_id` has the same parameter types and return type as
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// `prev_function_id`, applying the specified set of substitutions to the
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// previous function. Prints a suitable diagnostic and returns false if not.
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// Note that this doesn't include the syntactic check that's performed for
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// redeclarations.
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auto CheckFunctionTypeMatches(Context& context,
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SemIR::FunctionId new_function_id,
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SemIR::FunctionId prev_function_id,
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Substitutions substitutions) -> bool;
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// Tries to merge new_function into prev_function_id. Since new_function won't
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// have a definition even if one is upcoming, set is_definition to indicate the
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// planned result.
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//
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// If merging is successful, returns true and may update the previous function.
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// Otherwise, returns false. Prints a diagnostic when appropriate.
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auto MergeFunctionRedecl(Context& context, SemIRLoc new_loc,
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SemIR::Function& new_function, bool new_is_import,
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bool new_is_definition,
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SemIR::FunctionId prev_function_id,
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SemIR::ImportIRInstId prev_import_ir_inst_id) -> bool;
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// Checks that the return type of the specified function is complete, issuing an
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// error if not. This computes the return slot usage for the function if
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// necessary.
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auto CheckFunctionReturnType(Context& context, SemIRLoc loc,
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SemIR::Function& function) -> void;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_FUNCTION_H_
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