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Jon Ross-Perkins
86a7c9ff45
This was previously discussed at https://discord.com/channels/655572317891461132/655578254970716160/1209975051588210729. I'm initiating this mainly because we typically use "id" suffixes to indicate an `IdBase` being passed around and the non-id suffix of `parse_node` suggests at it carrying more data than it actually does. There used to be more reason for avoiding `node_id` because `SemIR::InstId` used to be named `NodeId`, but that's no longer necessary. As a consequence, I'd like to rename `parse_node` to more precisely reflect its type. In full, this is doing: ``` parse_node_kind -> node_kind parse_node -> node_id ParseNodeCategory -> NodeCategory ParseNodeKind -> NodeKind ParseNode -> NodeId ``` This is primarily in check and sem_ir, but with some `parse_node_kind` references in parse too. Pluralization is consistent with name forms on both sides, so that wasn't part of my replacements.
79 lines
2.7 KiB
C++
79 lines
2.7 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 HandleIfConditionStart(Context& /*context*/,
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Parse::IfConditionStartId /*node_id*/) -> bool {
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return true;
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}
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auto HandleIfCondition(Context& context, Parse::IfConditionId node_id) -> bool {
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// Convert the condition to `bool`.
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auto cond_value_id = context.node_stack().PopExpr();
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cond_value_id = ConvertToBoolValue(context, node_id, cond_value_id);
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// Create the then block and the else block, and branch to the right one. If
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// there is no `else`, the then block will terminate with a branch to the
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// else block, which will be reused as the resumption block.
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auto then_block_id =
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context.AddDominatedBlockAndBranchIf(node_id, cond_value_id);
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auto else_block_id = context.AddDominatedBlockAndBranch(node_id);
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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();
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context.node_stack().Push(node_id, else_block_id);
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return true;
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}
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auto HandleIfStatementElse(Context& context, Parse::IfStatementElseId node_id)
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-> bool {
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auto else_block_id = context.node_stack().Pop<Parse::NodeKind::IfCondition>();
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// Switch to emitting the `else` block.
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context.inst_block_stack().Push(else_block_id);
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context.AddCurrentCodeBlockToFunction();
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context.node_stack().Push(node_id);
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return true;
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}
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auto HandleIfStatement(Context& context, Parse::IfStatementId node_id) -> bool {
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switch (auto kind = context.node_stack().PeekNodeKind()) {
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case Parse::NodeKind::IfCondition: {
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// Branch from then block to else block, and start emitting the else
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// block.
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auto else_block_id =
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context.node_stack().Pop<Parse::NodeKind::IfCondition>();
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context.AddInst({node_id, SemIR::Branch{else_block_id}});
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context.inst_block_stack().Pop();
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context.inst_block_stack().Push(else_block_id);
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break;
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}
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case Parse::NodeKind::IfStatementElse: {
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// Branch from the then and else blocks to a new resumption block.
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context.node_stack()
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.PopAndDiscardSoloNodeId<Parse::NodeKind::IfStatementElse>();
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context.AddConvergenceBlockAndPush(node_id, /*num_blocks=*/2);
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break;
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}
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default: {
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CARBON_FATAL() << "Unexpected parse node at start of `if`: " << kind;
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}
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}
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context.AddCurrentCodeBlockToFunction();
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return true;
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}
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} // namespace Carbon::Check
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