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b9ed75cf2f
This CL updates the flow node to track the nodes which are inbound to the current target. This allows to fix an issue with a loop, after a continuing with a break, properly eliminating dead code. This also allows always providing the merge target for an if, it just knows if it's disconnected by having zero inbound branches. Bug: tint:1718 Change-Id: Ia9b9dbc734bf1e9cd0c829093c0cb1e470efb32e Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/107800 Commit-Queue: Dan Sinclair <dsinclair@chromium.org> Reviewed-by: Ben Clayton <bclayton@google.com> Kokoro: Kokoro <noreply+kokoro@google.com>
51 lines
1.5 KiB
C++
51 lines
1.5 KiB
C++
// Copyright 2022 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SRC_TINT_IR_IF_H_
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#define SRC_TINT_IR_IF_H_
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#include "src/tint/ast/if_statement.h"
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#include "src/tint/ir/flow_node.h"
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// Forward declarations
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namespace tint::ir {
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class Block;
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} // namespace tint::ir
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namespace tint::ir {
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/// A flow node representing an if statement.
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class If : public Castable<If, FlowNode> {
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public:
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/// Constructor
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/// @param stmt the ast::IfStatement or ast::BreakIfStatement
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explicit If(const ast::Statement* stmt);
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~If() override;
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/// The ast::IfStatement or ast::BreakIfStatement source for this flow node.
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const ast::Statement* source;
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/// The true branch block
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Block* true_target = nullptr;
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/// The false branch block
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Block* false_target = nullptr;
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/// An block to reconvert the true/false barnches. The block always exists, but there maybe no
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/// branches into it. (e.g. if both branches `return`)
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Block* merge_target = nullptr;
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};
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} // namespace tint::ir
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#endif // SRC_TINT_IR_IF_H_
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