mirror of
https://github.com/carbon-language/carbon-lang.git
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Richard Smith
288ad9f8e5
`semantics_handle.cpp` is a little on the large side, and is going to grow as we add new nodes. Some of the statement-specific parts have already been split into their own files. Split out the remaining such parts.
87 lines
3.2 KiB
C++
87 lines
3.2 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/semantics/semantics_context.h"
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#include "toolchain/semantics/semantics_node.h"
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namespace Carbon {
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auto SemanticsHandleIfConditionStart(SemanticsContext& /*context*/,
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ParseTree::Node /*parse_node*/) -> bool {
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return true;
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}
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auto SemanticsHandleIfCondition(SemanticsContext& context,
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ParseTree::Node parse_node) -> bool {
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// Convert the condition to `bool`.
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auto cond_value_id = context.node_stack().Pop<SemanticsNodeId>();
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cond_value_id = context.ImplicitAsBool(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 SemanticsHandleIfStatementElse(SemanticsContext& context,
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ParseTree::Node parse_node) -> bool {
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context.node_stack().PopAndDiscardSoloParseNode(ParseNodeKind::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 SemanticsHandleIfStatement(SemanticsContext& context,
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ParseTree::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 ParseNodeKind::IfCondition: {
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// Branch from then block to else block.
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context.node_stack().PopAndDiscardSoloParseNode(
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ParseNodeKind::IfCondition);
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context.AddNodeToBlock(
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sub_block_id,
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SemanticsNode::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 ParseNodeKind::IfStatementElse: {
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// Branch from the then and else blocks to a new resumption block.
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auto then_block_id = context.node_stack().Pop<SemanticsNodeBlockId>(
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ParseNodeKind::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
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