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https://github.com/carbon-language/carbon-lang.git
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Geoff Romer
87b4ca54e6
`ReturnTypeInfo` is built around the assumption that a function call results in exactly one initializing expression, but with `ref` returns there may be zero, and in the future composite return forms will enable there to be more than one. This change removes some usages of `ReturnTypeInfo`, and restructures the calling code to be prepared for multiple initializing returns.
72 lines
3.4 KiB
C++
72 lines
3.4 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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// Returns the ID of the self parameter pattern, or None.
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// TODO: Do this during initial traversal of implicit params.
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auto FindSelfPattern(Context& context,
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SemIR::InstBlockId implicit_param_patterns_id)
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-> SemIR::InstId;
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// Checks that `new_function` has the same return type as `prev_function`, or if
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// `prev_function_id` is specified, a specific version of `prev_function`.
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// Prints a suitable diagnostic and returns false if not. Never checks for a
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// syntactic match.
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auto CheckFunctionReturnTypeMatches(Context& context,
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const SemIR::Function& new_function,
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const SemIR::Function& prev_function,
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SemIR::SpecificId prev_specific_id,
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bool diagnose = true) -> bool;
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// Checks that `new_function` has the same parameter types and return type as
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// `prev_function`, or if `prev_function_id` is specified, a specific version of
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// `prev_function`. Prints a suitable diagnostic and returns false if not.
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//
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// `check_syntax` is false if the redeclaration can be called via a thunk with
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// implicit conversions from the original declaration.
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// `check_self` is false if the self declaration does not have to match (for
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// instance in impls of virtual functions).
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auto CheckFunctionTypeMatches(Context& context,
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const SemIR::Function& new_function,
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const SemIR::Function& prev_function,
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SemIR::SpecificId prev_specific_id,
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bool check_syntax, bool check_self,
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bool diagnose = true) -> bool;
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inline auto CheckFunctionTypeMatches(Context& context,
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const SemIR::Function& new_function,
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const SemIR::Function& prev_function)
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-> bool {
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return CheckFunctionTypeMatches(context, new_function, prev_function,
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SemIR::SpecificId::None,
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/*check_syntax=*/true, /*check_self=*/true);
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}
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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, and returns the function's return type.
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auto CheckFunctionReturnType(Context& context, SemIR::LocId loc_id,
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const SemIR::Function& function,
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SemIR::SpecificId specific_id) -> SemIR::TypeId;
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// Checks that a function declaration's signature is suitable to support a
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// function definition. This requires the parameter types to be complete and the
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// return type to be concrete.
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auto CheckFunctionDefinitionSignature(Context& context,
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SemIR::FunctionId function_id) -> void;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_FUNCTION_H_
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