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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).
85 lines
3.0 KiB
C++
85 lines
3.0 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/sem_ir/node.h"
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namespace Carbon::Check {
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auto HandleIfConditionStart(Context& /*context*/, Parse::Node /*parse_node*/)
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-> bool {
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return true;
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}
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auto HandleIfCondition(Context& context, Parse::Node parse_node) -> bool {
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// Convert the condition to `bool`.
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auto cond_value_id = context.node_stack().PopExpression();
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cond_value_id = context.ConvertToBoolValue(parse_node, 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(parse_node, cond_value_id);
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auto else_block_id = context.AddDominatedBlockAndBranch(parse_node);
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// Push the else and then blocks, and start emitting code in the then block.
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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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context.node_stack().Push(parse_node);
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return true;
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}
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auto HandleIfStatementElse(Context& context, Parse::Node parse_node) -> bool {
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context.node_stack()
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.PopAndDiscardSoloParseNode<Parse::NodeKind::IfCondition>();
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// Switch to emitting the else block.
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auto then_block_id = context.node_block_stack().PopForAdd();
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context.node_stack().Push(parse_node, then_block_id);
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context.AddCurrentCodeBlockToFunction();
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return true;
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}
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auto HandleIfStatement(Context& context, Parse::Node parse_node) -> bool {
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// Either the then or else block, depending on whether there's an `else` node
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// on the top of the node stack.
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auto sub_block_id = context.node_block_stack().PopForAdd();
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switch (auto kind = context.parse_tree().node_kind(
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context.node_stack().PeekParseNode())) {
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case Parse::NodeKind::IfCondition: {
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// Branch from then block to else block.
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context.node_stack()
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.PopAndDiscardSoloParseNode<Parse::NodeKind::IfCondition>();
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context.AddNodeToBlock(
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sub_block_id,
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SemIR::Node::Branch::Make(parse_node,
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context.node_block_stack().PeekForAdd()));
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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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SemIR::NodeBlockId then_block_id =
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context.node_stack().Pop<Parse::NodeKind::IfStatementElse>();
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context.AddConvergenceBlockAndPush(parse_node,
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{then_block_id, sub_block_id});
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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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