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c6b381495d
Replace the ShouldRun() method with Apply() which will do the transformation if it needs to be done, otherwise returns 'SkipTransform'. This reduces a bunch of duplicated scanning between the old ShouldRun() and Transform(). This change also adjusts code style to make the transforms more consistent. Change-Id: I9a6b10cb8b4ed62676b12ef30fb7764d363386c6 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/107681 Reviewed-by: James Price <jrprice@google.com> Kokoro: Kokoro <noreply+kokoro@google.com> Commit-Queue: Ben Clayton <bclayton@google.com> Reviewed-by: Dan Sinclair <dsinclair@chromium.org>
86 lines
2.4 KiB
C++
86 lines
2.4 KiB
C++
// Copyright 2021 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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#include "src/tint/transform/for_loop_to_loop.h"
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#include <utility>
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#include "src/tint/ast/break_statement.h"
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#include "src/tint/program_builder.h"
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TINT_INSTANTIATE_TYPEINFO(tint::transform::ForLoopToLoop);
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namespace tint::transform {
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namespace {
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bool ShouldRun(const Program* program) {
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for (auto* node : program->ASTNodes().Objects()) {
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if (node->Is<ast::ForLoopStatement>()) {
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return true;
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}
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}
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return false;
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}
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} // namespace
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ForLoopToLoop::ForLoopToLoop() = default;
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ForLoopToLoop::~ForLoopToLoop() = default;
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Transform::ApplyResult ForLoopToLoop::Apply(const Program* src, const DataMap&, DataMap&) const {
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if (!ShouldRun(src)) {
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return SkipTransform;
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}
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ProgramBuilder b;
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CloneContext ctx{&b, src, /* auto_clone_symbols */ true};
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ctx.ReplaceAll([&](const ast::ForLoopStatement* for_loop) -> const ast::Statement* {
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utils::Vector<const ast::Statement*, 8> stmts;
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if (auto* cond = for_loop->condition) {
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// !condition
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auto* not_cond = b.Not(ctx.Clone(cond));
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// { break; }
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auto* break_body = b.Block(b.Break());
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// if (!condition) { break; }
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stmts.Push(b.If(not_cond, break_body));
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}
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for (auto* stmt : for_loop->body->statements) {
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stmts.Push(ctx.Clone(stmt));
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}
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const ast::BlockStatement* continuing = nullptr;
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if (auto* cont = for_loop->continuing) {
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continuing = b.Block(ctx.Clone(cont));
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}
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auto* body = b.Block(stmts);
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auto* loop = b.Loop(body, continuing);
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if (auto* init = for_loop->initializer) {
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return b.Block(ctx.Clone(init), loop);
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}
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return loop;
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});
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ctx.Clone();
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return Program(std::move(b));
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}
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} // namespace tint::transform
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