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josh11bandChandler Carruth
48c986f52d
Goal is to increase type safety, though more work needs to be done (see added TODOs). Note that, after this change, check handlers corresponding to deleted parse node kinds will no longer compile. --------- Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
75 lines
2.6 KiB
C++
75 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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#include "toolchain/check/context.h"
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#include "toolchain/check/convert.h"
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namespace Carbon::Check {
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auto HandleIfExprIf(Context& context, Parse::IfExprIfId parse_node) -> bool {
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// Alias parse_node for if/then/else consistency.
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auto& if_node = parse_node;
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auto cond_value_id = context.node_stack().PopExpr();
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// Convert the condition to `bool`, and branch on it.
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cond_value_id = ConvertToBoolValue(context, if_node, cond_value_id);
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auto then_block_id =
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context.AddDominatedBlockAndBranchIf(if_node, cond_value_id);
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auto else_block_id = context.AddDominatedBlockAndBranch(if_node);
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// Start emitting the `then` block.
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context.inst_block_stack().Pop();
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context.inst_block_stack().Push(then_block_id);
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context.AddCurrentCodeBlockToFunction(parse_node);
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context.node_stack().Push(if_node, else_block_id);
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return true;
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}
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auto HandleIfExprThen(Context& context, Parse::IfExprThenId parse_node)
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-> bool {
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auto then_value_id = context.node_stack().PopExpr();
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auto else_block_id = context.node_stack().Peek<Parse::NodeKind::IfExprIf>();
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// Convert the first operand to a value.
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then_value_id = ConvertToValueExpr(context, then_value_id);
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// Start emitting the `else` block.
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context.inst_block_stack().Push(else_block_id);
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context.AddCurrentCodeBlockToFunction(parse_node);
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context.node_stack().Push(parse_node, then_value_id);
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return true;
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}
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auto HandleIfExprElse(Context& context, Parse::IfExprElseId parse_node)
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-> bool {
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// Alias parse_node for if/then/else consistency.
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auto& else_node = parse_node;
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auto else_value_id = context.node_stack().PopExpr();
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auto then_value_id = context.node_stack().Pop<Parse::NodeKind::IfExprThen>();
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auto [if_node, _] =
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context.node_stack().PopWithParseNode<Parse::NodeKind::IfExprIf>();
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// Convert the `else` value to the `then` value's type, and finish the `else`
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// block.
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// TODO: Find a common type, and convert both operands to it instead.
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auto result_type_id = context.insts().Get(then_value_id).type_id();
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else_value_id =
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ConvertToValueOfType(context, else_node, else_value_id, result_type_id);
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// Create a resumption block and branches to it.
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auto chosen_value_id = context.AddConvergenceBlockWithArgAndPush(
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if_node, {else_value_id, then_value_id});
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context.AddCurrentCodeBlockToFunction(parse_node);
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// Push the result value.
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context.node_stack().Push(else_node, chosen_value_id);
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return true;
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}
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} // namespace Carbon::Check
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