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110 lines
4.5 KiB
C++
110 lines
4.5 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_CONVERT_H_
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#define CARBON_TOOLCHAIN_CHECK_CONVERT_H_
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#include "toolchain/check/context.h"
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#include "toolchain/check/pending_block.h"
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#include "toolchain/parse/tree.h"
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namespace Carbon::Check {
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// Description of the target of a conversion.
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struct ConversionTarget {
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enum Kind : int8_t {
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// Convert to a value of type `type`.
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Value,
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// Convert to either a value or a reference of type `type`.
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ValueOrRef,
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// Convert for an explicit `as` cast. This allows any expression category
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// as the result, and uses the `As` interface instead of the `ImplicitAs`
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// interface.
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// TODO: Use of an interface for conversions is not yet supported.
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ExplicitAs,
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// The result of the conversion is discarded. It can't be an initializing
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// expression, but can be anything else.
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Discarded,
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// Convert to an initializer for the object denoted by `init_id`.
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Initializer,
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// Convert to an initializer for the object denoted by `init_id`,
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// including a final destination store if needed.
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FullInitializer,
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Last = FullInitializer
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};
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// The kind of the target for this conversion.
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Kind kind;
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// The target type for the conversion.
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SemIR::TypeId type_id;
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// For an initializer, the object being initialized.
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SemIR::InstId init_id = SemIR::InstId::Invalid;
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// For an initializer, a block of pending instructions that are needed to
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// form the value of `init_id`, and that can be discarded if no
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// initialization is needed.
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PendingBlock* init_block = nullptr;
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// Are we converting this value into an initializer for an object?
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auto is_initializer() const -> bool {
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return kind == Initializer || kind == FullInitializer;
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}
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};
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// Convert a value to another type and expression category.
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auto Convert(Context& context, Parse::NodeId parse_node, SemIR::InstId expr_id,
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ConversionTarget target) -> SemIR::InstId;
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// Performs initialization of `target_id` from `value_id`. Returns the
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// possibly-converted initializing expression, which should be assigned to the
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// target using a suitable node for the kind of initialization.
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auto Initialize(Context& context, Parse::NodeId parse_node,
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SemIR::InstId target_id, SemIR::InstId value_id)
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-> SemIR::InstId;
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// Convert the given expression to a value expression of the same type.
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auto ConvertToValueExpr(Context& context, SemIR::InstId expr_id)
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-> SemIR::InstId;
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// Convert the given expression to a value or reference expression of the same
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// type.
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auto ConvertToValueOrRefExpr(Context& context, SemIR::InstId expr_id)
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-> SemIR::InstId;
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// Converts `expr_id` to a value expression of type `type_id`.
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auto ConvertToValueOfType(Context& context, Parse::NodeId parse_node,
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SemIR::InstId expr_id, SemIR::TypeId type_id)
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-> SemIR::InstId;
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// Convert the given expression to a value or reference expression of the given
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// type.
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auto ConvertToValueOrRefOfType(Context& context, Parse::NodeId parse_node,
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SemIR::InstId expr_id, SemIR::TypeId type_id)
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-> SemIR::InstId;
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// Converts `value_id` to a value expression of type `bool`.
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auto ConvertToBoolValue(Context& context, Parse::NodeId parse_node,
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SemIR::InstId value_id) -> SemIR::InstId;
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// Converts `value_id` to type `type_id` for an `as` expression.
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auto ConvertForExplicitAs(Context& context, Parse::NodeId as_node,
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SemIR::InstId value_id, SemIR::TypeId type_id)
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-> SemIR::InstId;
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// Implicitly converts a set of arguments to match the parameter types in a
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// function call. Returns a block containing the converted implicit and explicit
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// argument values.
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auto ConvertCallArgs(Context& context, Parse::NodeId call_parse_node,
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SemIR::InstId self_id,
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llvm::ArrayRef<SemIR::InstId> arg_refs,
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SemIR::InstId return_storage_id, SemIR::InstId callee_id,
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SemIR::InstBlockId implicit_param_refs_id,
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SemIR::InstBlockId param_refs_id) -> SemIR::InstBlockId;
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// Converts an expression for use as a type.
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auto ExprAsType(Context& context, Parse::NodeId parse_node,
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SemIR::InstId value_id) -> SemIR::TypeId;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_CONVERT_H_
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