mirror of
https://github.com/carbon-language/carbon-lang.git
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Richard Smith
332a368cee
As discussed [on discord](https://discord.com/channels/655572317891461132/655578254970716160/1178878128714678282) and today's toolchain discussion.
73 lines
2.6 KiB
C++
73 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::NodeId 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::NodeId parse_node) -> 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::NodeId 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().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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