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Jon Ross-Perkins
1c748c0f14
Continuing along with #3070. Note this is just a file rename, with BUILD edits; every file previously in semantics/ should show as moved (except maybe BUILDs, which split).
78 lines
2.9 KiB
C++
78 lines
2.9 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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namespace Carbon::Check {
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auto HandleIfExpressionIf(Context& context, Parse::Node 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().PopExpression();
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context.node_stack().Push(if_node);
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// Convert the condition to `bool`, and branch on it.
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cond_value_id = context.ConvertToBoolValue(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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// Push the `else` block and `then` block, and start emitting the `then`.
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context.node_block_stack().Pop();
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context.node_block_stack().Push(else_block_id);
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context.node_block_stack().Push(then_block_id);
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context.AddCurrentCodeBlockToFunction();
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return true;
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}
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auto HandleIfExpressionThen(Context& context, Parse::Node parse_node) -> bool {
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// Alias parse_node for if/then/else consistency.
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auto& then_node = parse_node;
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// Convert the first operand to a value.
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auto [then_value_node, then_value_id] =
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context.node_stack().PopExpressionWithParseNode();
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context.node_stack().Push(then_value_node,
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context.ConvertToValueExpression(then_value_id));
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context.node_stack().Push(then_node, context.node_block_stack().Pop());
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context.AddCurrentCodeBlockToFunction();
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return true;
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}
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auto HandleIfExpressionElse(Context& context, Parse::Node parse_node) -> 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().PopExpression();
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auto [then_node, then_end_block_id] =
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context.node_stack()
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.PopWithParseNode<Parse::NodeKind::IfExpressionThen>();
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auto then_value_id = context.node_stack().PopExpression();
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auto if_node = context.node_stack()
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.PopForSoloParseNode<Parse::NodeKind::IfExpressionIf>();
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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.semantics_ir().GetNode(then_value_id).type_id();
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else_value_id =
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context.ConvertToValueOfType(else_node, else_value_id, result_type_id);
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auto else_end_block_id = context.node_block_stack().Pop();
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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,
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{{then_end_block_id, then_value_id}, {else_end_block_id, else_value_id}});
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context.AddCurrentCodeBlockToFunction();
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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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