[metal-writer] Add return generation.
This CL adds generation of the return statement.
Bug: tint:8
Change-Id: Iffee600e77a485649b987d39aab47742968e438e
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/23702
Reviewed-by: David Neto <dneto@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index e943951..ad647f4 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -885,6 +885,7 @@
source_set("tint_unittests_msl_writer_src") {
sources = [
+ "src/writer/msl/generator_impl_return_test.cc",
"src/writer/msl/generator_impl_test.cc",
"src/writer/msl/generator_impl_type_test.cc",
]
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 424a4c3..b321263 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -493,6 +493,7 @@
if(${TINT_BUILD_MSL_WRITER})
list(APPEND TINT_TEST_SRCS
+ writer/msl/generator_impl_return_test.cc
writer/msl/generator_impl_test.cc
writer/msl/generator_impl_type_test.cc
)
diff --git a/src/writer/msl/generator_impl.cc b/src/writer/msl/generator_impl.cc
index cb2a173..88e93f2 100644
--- a/src/writer/msl/generator_impl.cc
+++ b/src/writer/msl/generator_impl.cc
@@ -14,6 +14,7 @@
#include "src/writer/msl/generator_impl.h"
+#include "src/ast/return_statement.h"
#include "src/ast/type/alias_type.h"
#include "src/ast/type/array_type.h"
#include "src/ast/type/bool_type.h"
@@ -38,6 +39,61 @@
return true;
}
+bool GeneratorImpl::EmitExpression(ast::Expression*) {
+ error_ = "unknown expression type";
+ return false;
+}
+
+bool GeneratorImpl::EmitReturn(ast::ReturnStatement* stmt) {
+ make_indent();
+
+ out_ << "return";
+ if (stmt->has_value()) {
+ out_ << " ";
+ if (!EmitExpression(stmt->value())) {
+ return false;
+ }
+ }
+ out_ << ";" << std::endl;
+ return true;
+}
+
+bool GeneratorImpl::EmitStatementBlock(const ast::StatementList& statements) {
+ out_ << " {" << std::endl;
+
+ increment_indent();
+
+ for (const auto& s : statements) {
+ if (!EmitStatement(s.get())) {
+ return false;
+ }
+ }
+
+ decrement_indent();
+ make_indent();
+ out_ << "}";
+
+ return true;
+}
+
+bool GeneratorImpl::EmitStatementBlockAndNewline(
+ const ast::StatementList& statements) {
+ const bool result = EmitStatementBlock(statements);
+ if (result) {
+ out_ << std::endl;
+ }
+ return result;
+}
+
+bool GeneratorImpl::EmitStatement(ast::Statement* stmt) {
+ if (stmt->IsReturn()) {
+ return EmitReturn(stmt->AsReturn());
+ }
+
+ error_ = "unknown statement type";
+ return false;
+}
+
bool GeneratorImpl::EmitType(ast::type::Type* type, const std::string& name) {
if (type->IsAlias()) {
auto* alias = type->AsAlias();
diff --git a/src/writer/msl/generator_impl.h b/src/writer/msl/generator_impl.h
index befa305..6fe8a46 100644
--- a/src/writer/msl/generator_impl.h
+++ b/src/writer/msl/generator_impl.h
@@ -37,6 +37,26 @@
/// @returns true on successful generation; false otherwise
bool Generate(const ast::Module& module);
+ /// Handles generate an Expression
+ /// @param expr the expression
+ /// @returns true if the expression was emitted
+ bool EmitExpression(ast::Expression* expr);
+ /// Handles return statements
+ /// @param stmt the statement to emit
+ /// @returns true if the statement was successfully emitted
+ bool EmitReturn(ast::ReturnStatement* stmt);
+ /// Handles a brace-enclosed list of statements.
+ /// @param statements the statements to output
+ /// @returns true if the statements were emitted
+ bool EmitStatementBlock(const ast::StatementList& statements);
+ /// Handles a brace-enclosed list of statements and trailing newline.
+ /// @param statements the statements to output
+ /// @returns true if the statements were emitted
+ bool EmitStatementBlockAndNewline(const ast::StatementList& statements);
+ /// Handles statement
+ /// @param stmt the statement to emit
+ /// @returns true if the statement was emitted
+ bool EmitStatement(ast::Statement* stmt);
/// Handles generating type
/// @param type the type to generate
/// @param name the name of the variable, only used for array emission
diff --git a/src/writer/msl/generator_impl_return_test.cc b/src/writer/msl/generator_impl_return_test.cc
new file mode 100644
index 0000000..296ba0b
--- /dev/null
+++ b/src/writer/msl/generator_impl_return_test.cc
@@ -0,0 +1,54 @@
+// 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 <memory>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "src/ast/identifier_expression.h"
+#include "src/ast/return_statement.h"
+#include "src/writer/msl/generator_impl.h"
+
+namespace tint {
+namespace writer {
+namespace msl {
+namespace {
+
+using MslGeneratorImplTest = testing::Test;
+
+TEST_F(MslGeneratorImplTest, Emit_Return) {
+ ast::ReturnStatement r;
+
+ GeneratorImpl g;
+ g.increment_indent();
+
+ ASSERT_TRUE(g.EmitStatement(&r)) << g.error();
+ EXPECT_EQ(g.result(), " return;\n");
+}
+
+TEST_F(MslGeneratorImplTest, DISABLED_Emit_ReturnWithValue) {
+ auto expr = std::make_unique<ast::IdentifierExpression>("expr");
+ ast::ReturnStatement r(std::move(expr));
+
+ GeneratorImpl g;
+ g.increment_indent();
+
+ ASSERT_TRUE(g.EmitStatement(&r)) << g.error();
+ EXPECT_EQ(g.result(), " return expr;\n");
+}
+
+} // namespace
+} // namespace msl
+} // namespace writer
+} // namespace tint
