Emit UnaryMethod expressions.

This CL updates the WGSL generator to output UnaryMethodExpression
nodes.

Bug: tint:4
Change-Id: If43c0e5c12a967f08cc23e816d292353490404cf
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/17160
Reviewed-by: David Neto <dneto@google.com>

src/CMakeLists.txt

@@ -417,6 +417,7 @@ if(${TINT_BUILD_WGSL_WRITER})
     writer/wgsl/generator_impl_relational_test.cc
     writer/wgsl/generator_impl_type_test.cc
     writer/wgsl/generator_impl_unary_derivative_test.cc
+    writer/wgsl/generator_impl_unary_method_test.cc
     writer/wgsl/generator_impl_variable_test.cc
   )
 endif()

src/writer/wgsl/generator_impl.cc

@@ -45,6 +45,7 @@
 #include "src/ast/type_initializer_expression.h"
 #include "src/ast/uint_literal.h"
 #include "src/ast/unary_derivative_expression.h"
+#include "src/ast/unary_method_expression.h"
 
 namespace tint {
 namespace writer {
@@ -148,6 +149,9 @@ bool GeneratorImpl::EmitExpression(ast::Expression* expr) {
   if (expr->IsUnaryDerivative()) {
     return EmitUnaryDerivative(expr->AsUnaryDerivative());
   }
+  if (expr->IsUnaryMethod()) {
+    return EmitUnaryMethod(expr->AsUnaryMethod());
+  }
 
   error_ = "unknown expression type";
   return false;
@@ -566,6 +570,51 @@ bool GeneratorImpl::EmitUnaryDerivative(ast::UnaryDerivativeExpression* expr) {
   return true;
 }
 
+bool GeneratorImpl::EmitUnaryMethod(ast::UnaryMethodExpression* expr) {
+  switch (expr->op()) {
+    case ast::UnaryMethod::kAny:
+      out_ << "any";
+      break;
+    case ast::UnaryMethod::kAll:
+      out_ << "all";
+      break;
+    case ast::UnaryMethod::kIsNan:
+      out_ << "is_nan";
+      break;
+    case ast::UnaryMethod::kIsInf:
+      out_ << "is_inf";
+      break;
+    case ast::UnaryMethod::kIsFinite:
+      out_ << "is_finite";
+      break;
+    case ast::UnaryMethod::kIsNormal:
+      out_ << "is_normal";
+      break;
+    case ast::UnaryMethod::kDot:
+      out_ << "dot";
+      break;
+    case ast::UnaryMethod::kOuterProduct:
+      out_ << "outer_product";
+      break;
+  }
+  out_ << "(";
+
+  bool first = true;
+  for (const auto& param : expr->params()) {
+    if (!first) {
+      out_ << ", ";
+    }
+    first = false;
+
+    if (!EmitExpression(param.get())) {
+      return false;
+    }
+  }
+  out_ << ")";
+
+  return true;
+}
+
 }  // namespace wgsl
 }  // namespace writer
 }  // namespace tint

src/writer/wgsl/generator_impl.h

@@ -130,6 +130,10 @@ class GeneratorImpl {
   /// @param expr the expression to emit
   /// @returns true if the expression was emitted
   bool EmitUnaryDerivative(ast::UnaryDerivativeExpression* expr);
+  /// Handles a unary method expression
+  /// @param expr the expression to emit
+  /// @returns true if the expression was emitted
+  bool EmitUnaryMethod(ast::UnaryMethodExpression* expr);
   /// Handles generating a variable
   /// @param var the variable to generate
   /// @returns true if the variable was emitted

src/writer/wgsl/generator_impl_unary_method_test.cc

@@ -0,0 +1,85 @@
+// 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/unary_method_expression.h"
+#include "src/writer/wgsl/generator_impl.h"
+
+namespace tint {
+namespace writer {
+namespace wgsl {
+namespace {
+
+struct UnaryMethodData {
+  const char* name;
+  ast::UnaryMethod method;
+};
+inline std::ostream& operator<<(std::ostream& out, UnaryMethodData data) {
+  out << data.method;
+  return out;
+}
+using UnaryMethodTest = testing::TestWithParam<UnaryMethodData>;
+TEST_P(UnaryMethodTest, Emit) {
+  auto params = GetParam();
+
+  auto expr = std::make_unique<ast::IdentifierExpression>("expr");
+  std::vector<std::unique_ptr<ast::Expression>> ops;
+  ops.push_back(std::move(expr));
+
+  ast::UnaryMethodExpression method(params.method, std::move(ops));
+
+  GeneratorImpl g;
+  ASSERT_TRUE(g.EmitExpression(&method)) << g.error();
+  EXPECT_EQ(g.result(), std::string(params.name) + "(expr)");
+}
+INSTANTIATE_TEST_SUITE_P(
+    GeneratorImplTest,
+    UnaryMethodTest,
+    testing::Values(UnaryMethodData{"any", ast::UnaryMethod::kAny},
+                    UnaryMethodData{"all", ast::UnaryMethod::kAll},
+                    UnaryMethodData{"is_nan", ast::UnaryMethod::kIsNan},
+                    UnaryMethodData{"is_finite", ast::UnaryMethod::kIsFinite},
+                    UnaryMethodData{"is_normal", ast::UnaryMethod::kIsNormal}));
+
+using UnaryMethodTest_MultiParam = testing::TestWithParam<UnaryMethodData>;
+TEST_P(UnaryMethodTest_MultiParam, Emit) {
+  auto params = GetParam();
+
+  auto expr1 = std::make_unique<ast::IdentifierExpression>("expr1");
+  auto expr2 = std::make_unique<ast::IdentifierExpression>("expr2");
+  std::vector<std::unique_ptr<ast::Expression>> ops;
+  ops.push_back(std::move(expr1));
+  ops.push_back(std::move(expr2));
+
+  ast::UnaryMethodExpression method(params.method, std::move(ops));
+
+  GeneratorImpl g;
+  ASSERT_TRUE(g.EmitExpression(&method)) << g.error();
+  EXPECT_EQ(g.result(), std::string(params.name) + "(expr1, expr2)");
+}
+INSTANTIATE_TEST_SUITE_P(
+    GeneratorImplTest,
+    UnaryMethodTest_MultiParam,
+    testing::Values(UnaryMethodData{"dot", ast::UnaryMethod::kDot},
+                    UnaryMethodData{"outer_product",
+                                    ast::UnaryMethod::kOuterProduct}));
+
+}  // namespace
+}  // namespace wgsl
+}  // namespace writer
+}  // namespace tint