[hlsl-writer] Add if/else statements.
This CL adds if/else statement emission to the HLSL writer.
Bug: tint:7
Change-Id: Idd6e6d8c329ed270676fa0276474a68c715dd9eb
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/25847
Reviewed-by: David Neto <dneto@google.com>
diff --git a/src/writer/hlsl/generator_impl_if_test.cc b/src/writer/hlsl/generator_impl_if_test.cc
new file mode 100644
index 0000000..f133304
--- /dev/null
+++ b/src/writer/hlsl/generator_impl_if_test.cc
@@ -0,0 +1,143 @@
+// Copyright 2020 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "gtest/gtest.h"
+#include "src/ast/else_statement.h"
+#include "src/ast/identifier_expression.h"
+#include "src/ast/if_statement.h"
+#include "src/ast/module.h"
+#include "src/ast/return_statement.h"
+#include "src/writer/hlsl/generator_impl.h"
+
+namespace tint {
+namespace writer {
+namespace hlsl {
+namespace {
+
+using HlslGeneratorImplTest = testing::Test;
+
+TEST_F(HlslGeneratorImplTest, Emit_If) {
+ auto cond = std::make_unique<ast::IdentifierExpression>("cond");
+ auto body = std::make_unique<ast::BlockStatement>();
+ body->append(std::make_unique<ast::ReturnStatement>());
+
+ ast::IfStatement i(std::move(cond), std::move(body));
+
+ ast::Module m;
+ GeneratorImpl g(&m);
+ g.increment_indent();
+
+ ASSERT_TRUE(g.EmitStatement(&i)) << g.error();
+ EXPECT_EQ(g.result(), R"( if (cond) {
+ return;
+ }
+)");
+}
+
+TEST_F(HlslGeneratorImplTest, Emit_IfWithElseIf) {
+ auto else_cond = std::make_unique<ast::IdentifierExpression>("else_cond");
+ auto else_body = std::make_unique<ast::BlockStatement>();
+ else_body->append(std::make_unique<ast::ReturnStatement>());
+
+ ast::ElseStatementList elses;
+ elses.push_back(std::make_unique<ast::ElseStatement>(std::move(else_cond),
+ std::move(else_body)));
+
+ auto cond = std::make_unique<ast::IdentifierExpression>("cond");
+ auto body = std::make_unique<ast::BlockStatement>();
+ body->append(std::make_unique<ast::ReturnStatement>());
+
+ ast::IfStatement i(std::move(cond), std::move(body));
+ i.set_else_statements(std::move(elses));
+
+ ast::Module m;
+ GeneratorImpl g(&m);
+ g.increment_indent();
+
+ ASSERT_TRUE(g.EmitStatement(&i)) << g.error();
+ EXPECT_EQ(g.result(), R"( if (cond) {
+ return;
+ } else if (else_cond) {
+ return;
+ }
+)");
+}
+
+TEST_F(HlslGeneratorImplTest, Emit_IfWithElse) {
+ auto else_body = std::make_unique<ast::BlockStatement>();
+ else_body->append(std::make_unique<ast::ReturnStatement>());
+
+ ast::ElseStatementList elses;
+ elses.push_back(std::make_unique<ast::ElseStatement>(std::move(else_body)));
+
+ auto cond = std::make_unique<ast::IdentifierExpression>("cond");
+ auto body = std::make_unique<ast::BlockStatement>();
+ body->append(std::make_unique<ast::ReturnStatement>());
+
+ ast::IfStatement i(std::move(cond), std::move(body));
+ i.set_else_statements(std::move(elses));
+
+ ast::Module m;
+ GeneratorImpl g(&m);
+ g.increment_indent();
+
+ ASSERT_TRUE(g.EmitStatement(&i)) << g.error();
+ EXPECT_EQ(g.result(), R"( if (cond) {
+ return;
+ } else {
+ return;
+ }
+)");
+}
+
+TEST_F(HlslGeneratorImplTest, Emit_IfWithMultiple) {
+ auto else_cond = std::make_unique<ast::IdentifierExpression>("else_cond");
+
+ auto else_body = std::make_unique<ast::BlockStatement>();
+ else_body->append(std::make_unique<ast::ReturnStatement>());
+
+ auto else_body_2 = std::make_unique<ast::BlockStatement>();
+ else_body_2->append(std::make_unique<ast::ReturnStatement>());
+
+ ast::ElseStatementList elses;
+ elses.push_back(std::make_unique<ast::ElseStatement>(std::move(else_cond),
+ std::move(else_body)));
+ elses.push_back(std::make_unique<ast::ElseStatement>(std::move(else_body_2)));
+
+ auto cond = std::make_unique<ast::IdentifierExpression>("cond");
+ auto body = std::make_unique<ast::BlockStatement>();
+ body->append(std::make_unique<ast::ReturnStatement>());
+
+ ast::IfStatement i(std::move(cond), std::move(body));
+ i.set_else_statements(std::move(elses));
+
+ ast::Module m;
+ GeneratorImpl g(&m);
+ g.increment_indent();
+
+ ASSERT_TRUE(g.EmitStatement(&i)) << g.error();
+ EXPECT_EQ(g.result(), R"( if (cond) {
+ return;
+ } else if (else_cond) {
+ return;
+ } else {
+ return;
+ }
+)");
+}
+
+} // namespace
+} // namespace hlsl
+} // namespace writer
+} // namespace tint
