[hlsl-writer] Add support for import statements.

This Cl adds support for imported methods to the HLSL backend.

Bug: tint:7
Change-Id: Ib906542915670dcc916d48d9e5d64d7032ba829a
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/26928
Commit-Queue: dan sinclair <dsinclair@chromium.org>
Reviewed-by: David Neto <dneto@google.com>

BUILD.gn

@@ -1073,6 +1073,7 @@ source_set("tint_unittests_hlsl_writer_src") {
     "src/writer/hlsl/generator_impl_function_test.cc",
     "src/writer/hlsl/generator_impl_identifier_test.cc",
     "src/writer/hlsl/generator_impl_if_test.cc",
+    "src/writer/hlsl/generator_impl_import_test.cc",
     "src/writer/hlsl/generator_impl_intrinsic_test.cc",
     "src/writer/hlsl/generator_impl_loop_test.cc",
     "src/writer/hlsl/generator_impl_member_accessor_test.cc",

src/CMakeLists.txt

@@ -585,6 +585,7 @@ if (${TINT_BUILD_HLSL_WRITER})
     writer/hlsl/generator_impl_identifier_test.cc
     writer/hlsl/generator_impl_if_test.cc
     writer/hlsl/generator_impl_intrinsic_test.cc
+    writer/hlsl/generator_impl_import_test.cc
     writer/hlsl/generator_impl_loop_test.cc
     writer/hlsl/generator_impl_member_accessor_test.cc
     writer/hlsl/generator_impl_module_constant_test.cc

src/writer/hlsl/generator_impl.cc

@@ -14,6 +14,7 @@
 
 #include "src/writer/hlsl/generator_impl.h"
 
+#include "spirv/unified1/GLSL.std.450.h"
 #include "src/ast/array_accessor_expression.h"
 #include "src/ast/as_expression.h"
 #include "src/ast/assignment_statement.h"
@@ -525,12 +526,128 @@ bool GeneratorImpl::EmitCall(ast::CallExpression* expr) {
 
     out_ << ")";
   } else {
-    error_ = "Imported functions not supported in HLSL backend.";
+    return EmitImportFunction(expr);
-    return false;
   }
   return true;
 }
 
+bool GeneratorImpl::EmitImportFunction(ast::CallExpression* expr) {
+  auto* ident = expr->func()->AsIdentifier();
+
+  auto* imp = module_->FindImportByName(ident->path());
+  if (imp == nullptr) {
+    error_ = "unable to find import for " + ident->path();
+    return 0;
+  }
+  auto id = imp->GetIdForMethod(ident->name());
+  if (id == 0) {
+    error_ = "unable to lookup: " + ident->name() + " in " + ident->path();
+  }
+
+  switch (id) {
+    case GLSLstd450Acos:
+    case GLSLstd450Asin:
+    case GLSLstd450Atan:
+    case GLSLstd450Atan2:
+    case GLSLstd450Ceil:
+    case GLSLstd450Cos:
+    case GLSLstd450Cosh:
+    case GLSLstd450Cross:
+    case GLSLstd450Degrees:
+    case GLSLstd450Determinant:
+    case GLSLstd450Distance:
+    case GLSLstd450Exp:
+    case GLSLstd450Exp2:
+    case GLSLstd450FaceForward:
+    case GLSLstd450Floor:
+    case GLSLstd450Fma:
+    case GLSLstd450Length:
+    case GLSLstd450Log:
+    case GLSLstd450Log2:
+    case GLSLstd450Normalize:
+    case GLSLstd450Pow:
+    case GLSLstd450Radians:
+    case GLSLstd450Reflect:
+    case GLSLstd450Round:
+    case GLSLstd450Sin:
+    case GLSLstd450Sinh:
+    case GLSLstd450SmoothStep:
+    case GLSLstd450Sqrt:
+    case GLSLstd450Step:
+    case GLSLstd450Tan:
+    case GLSLstd450Tanh:
+    case GLSLstd450Trunc:
+      out_ << ident->name();
+      break;
+    case GLSLstd450Fract:
+      out_ << "frac";
+      break;
+    case GLSLstd450InterpolateAtCentroid:
+      out_ << "EvaluateAttributeAtCentroid";
+      break;
+    case GLSLstd450InverseSqrt:
+      out_ << "rsqrt";
+      break;
+    case GLSLstd450FMix:
+      out_ << "mix";
+      break;
+    case GLSLstd450SSign:
+    case GLSLstd450FSign:
+      out_ << "sign";
+      break;
+    case GLSLstd450FAbs:
+    case GLSLstd450SAbs:
+      out_ << "abs";
+      break;
+    case GLSLstd450FMax:
+    case GLSLstd450NMax:
+    case GLSLstd450SMax:
+    case GLSLstd450UMax:
+      out_ << "max";
+      break;
+    case GLSLstd450FMin:
+    case GLSLstd450NMin:
+    case GLSLstd450SMin:
+    case GLSLstd450UMin:
+      out_ << "min";
+      break;
+    case GLSLstd450FClamp:
+    case GLSLstd450SClamp:
+    case GLSLstd450NClamp:
+    case GLSLstd450UClamp:
+      out_ << "clamp";
+      break;
+    // TODO(dsinclair): Determine mappings for the following
+    case GLSLstd450Atanh:
+    case GLSLstd450Asinh:
+    case GLSLstd450Acosh:
+    case GLSLstd450FindILsb:
+    case GLSLstd450FindUMsb:
+    case GLSLstd450FindSMsb:
+    case GLSLstd450MatrixInverse:
+    case GLSLstd450RoundEven:
+      error_ = "Unknown import method: " + ident->name();
+      return false;
+  }
+
+  out_ << "(";
+  bool first = true;
+  const auto& params = expr->params();
+  for (const auto& param : params) {
+    if (!first) {
+      out_ << ", ";
+    }
+    first = false;
+
+    if (!EmitExpression(param.get())) {
+      return false;
+    }
+  }
+  out_ << ")";
+
+  return true;
+}
+
 bool GeneratorImpl::EmitCast(ast::CastExpression* expr) {
   if (!EmitType(expr->type(), "")) {
     return false;

src/writer/hlsl/generator_impl.h

@@ -139,6 +139,10 @@ class GeneratorImpl : public TextGenerator {
   /// @param stmt the statement to emit
   /// @returns true if the statement was successfully emitted
   bool EmitIf(ast::IfStatement* stmt);
+  /// Handles genreating an import expression
+  /// @param expr the expression
+  /// @returns true if the expression was successfully emitted.
+  bool EmitImportFunction(ast::CallExpression* expr);
   /// Handles a literal
   /// @param lit the literal to emit
   /// @returns true if the literal was successfully emitted

src/writer/hlsl/generator_impl_import_test.cc

@@ -0,0 +1,386 @@
+// 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 <string>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "src/ast/call_expression.h"
+#include "src/ast/float_literal.h"
+#include "src/ast/identifier_expression.h"
+#include "src/ast/module.h"
+#include "src/ast/scalar_constructor_expression.h"
+#include "src/ast/sint_literal.h"
+#include "src/ast/type/f32_type.h"
+#include "src/ast/type/i32_type.h"
+#include "src/ast/type/matrix_type.h"
+#include "src/ast/type/vector_type.h"
+#include "src/ast/type_constructor_expression.h"
+#include "src/context.h"
+#include "src/type_determiner.h"
+#include "src/writer/hlsl/generator_impl.h"
+
+namespace tint {
+namespace writer {
+namespace hlsl {
+namespace {
+
+using HlslGeneratorImplTest = testing::Test;
+
+struct HlslImportData {
+  const char* name;
+  const char* hlsl_name;
+};
+inline std::ostream& operator<<(std::ostream& out, HlslImportData data) {
+  out << data.name;
+  return out;
+}
+using HlslImportData_SingleParamTest = testing::TestWithParam<HlslImportData>;
+TEST_P(HlslImportData_SingleParamTest, FloatScalar) {
+  auto param = GetParam();
+
+  ast::type::F32Type f32;
+
+  ast::ExpressionList params;
+  params.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::FloatLiteral>(&f32, 1.f)));
+
+  ast::CallExpression expr(std::make_unique<ast::IdentifierExpression>(
+                               std::vector<std::string>{"std", param.name}),
+                           std::move(params));
+
+  Context ctx;
+  ast::Module mod;
+  TypeDeterminer td(&ctx, &mod);
+  mod.AddImport(std::make_unique<ast::Import>("GLSL.std.450", "std"));
+
+  ASSERT_TRUE(td.DetermineResultType(&expr)) << td.error();
+
+  GeneratorImpl g(&mod);
+  ASSERT_TRUE(g.EmitImportFunction(&expr)) << g.error();
+  EXPECT_EQ(g.result(), std::string(param.hlsl_name) + "(1.00000000f)");
+}
+INSTANTIATE_TEST_SUITE_P(
+    HlslGeneratorImplTest,
+    HlslImportData_SingleParamTest,
+    testing::Values(HlslImportData{"acos", "acos"},
+                    HlslImportData{"asin", "asin"},
+                    HlslImportData{"atan", "atan"},
+                    HlslImportData{"cos", "cos"},
+                    HlslImportData{"cosh", "cosh"},
+                    HlslImportData{"ceil", "ceil"},
+                    HlslImportData{"degrees", "degrees"},
+                    HlslImportData{"exp", "exp"},
+                    HlslImportData{"exp2", "exp2"},
+                    HlslImportData{"fabs", "abs"},
+                    HlslImportData{"floor", "floor"},
+                    HlslImportData{"fract", "frac"},
+                    HlslImportData{"interpolateatcentroid",
+                                   "EvaluateAttributeAtCentroid"},
+                    HlslImportData{"inversesqrt", "rsqrt"},
+                    HlslImportData{"length", "length"},
+                    HlslImportData{"log", "log"},
+                    HlslImportData{"log2", "log2"},
+                    HlslImportData{"normalize", "normalize"},
+                    HlslImportData{"radians", "radians"},
+                    HlslImportData{"round", "round"},
+                    HlslImportData{"fsign", "sign"},
+                    HlslImportData{"sin", "sin"},
+                    HlslImportData{"sinh", "sinh"},
+                    HlslImportData{"sqrt", "sqrt"},
+                    HlslImportData{"tan", "tan"},
+                    HlslImportData{"tanh", "tanh"},
+                    HlslImportData{"trunc", "trunc"}));
+
+TEST_F(HlslGeneratorImplTest, DISABLED_HlslImportData_Acosh) {
+  FAIL();
+}
+
+TEST_F(HlslGeneratorImplTest, DISABLED_HlslImportData_ASinh) {
+  FAIL();
+}
+
+TEST_F(HlslGeneratorImplTest, DISABLED_HlslImportData_ATanh) {
+  FAIL();
+}
+
+using HlslImportData_SingleIntParamTest =
+    testing::TestWithParam<HlslImportData>;
+TEST_P(HlslImportData_SingleIntParamTest, IntScalar) {
+  auto param = GetParam();
+
+  ast::type::I32Type i32;
+
+  ast::ExpressionList params;
+  params.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::SintLiteral>(&i32, 1)));
+
+  ast::CallExpression expr(std::make_unique<ast::IdentifierExpression>(
+                               std::vector<std::string>{"std", param.name}),
+                           std::move(params));
+
+  Context ctx;
+  ast::Module mod;
+  TypeDeterminer td(&ctx, &mod);
+  mod.AddImport(std::make_unique<ast::Import>("GLSL.std.450", "std"));
+
+  ASSERT_TRUE(td.DetermineResultType(&expr)) << td.error();
+
+  GeneratorImpl g(&mod);
+  ASSERT_TRUE(g.EmitImportFunction(&expr)) << g.error();
+  EXPECT_EQ(g.result(), std::string(param.hlsl_name) + "(1)");
+}
+INSTANTIATE_TEST_SUITE_P(HlslGeneratorImplTest,
+                         HlslImportData_SingleIntParamTest,
+                         testing::Values(HlslImportData{"sabs", "abs"},
+                                         HlslImportData{"ssign", "sign"}));
+
+using HlslImportData_DualParamTest = testing::TestWithParam<HlslImportData>;
+TEST_P(HlslImportData_DualParamTest, FloatScalar) {
+  auto param = GetParam();
+
+  ast::type::F32Type f32;
+
+  ast::ExpressionList params;
+  params.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::FloatLiteral>(&f32, 1.f)));
+  params.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::FloatLiteral>(&f32, 2.f)));
+
+  ast::CallExpression expr(std::make_unique<ast::IdentifierExpression>(
+                               std::vector<std::string>{"std", param.name}),
+                           std::move(params));
+
+  Context ctx;
+  ast::Module mod;
+  TypeDeterminer td(&ctx, &mod);
+  mod.AddImport(std::make_unique<ast::Import>("GLSL.std.450", "std"));
+
+  ASSERT_TRUE(td.DetermineResultType(&expr)) << td.error();
+
+  GeneratorImpl g(&mod);
+  ASSERT_TRUE(g.EmitImportFunction(&expr)) << g.error();
+  EXPECT_EQ(g.result(),
+            std::string(param.hlsl_name) + "(1.00000000f, 2.00000000f)");
+}
+INSTANTIATE_TEST_SUITE_P(HlslGeneratorImplTest,
+                         HlslImportData_DualParamTest,
+                         testing::Values(HlslImportData{"atan2", "atan2"},
+                                         HlslImportData{"distance", "distance"},
+                                         HlslImportData{"fmax", "max"},
+                                         HlslImportData{"fmin", "min"},
+                                         HlslImportData{"nmax", "max"},
+                                         HlslImportData{"nmin", "min"},
+                                         HlslImportData{"pow", "pow"},
+                                         HlslImportData{"reflect", "reflect"},
+                                         HlslImportData{"step", "step"}));
+
+using HlslImportData_DualParam_VectorTest =
+    testing::TestWithParam<HlslImportData>;
+TEST_P(HlslImportData_DualParam_VectorTest, FloatVector) {
+  auto param = GetParam();
+
+  ast::type::F32Type f32;
+  ast::type::VectorType vec(&f32, 3);
+
+  ast::ExpressionList type_params;
+  type_params.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::FloatLiteral>(&f32, 1.f)));
+  type_params.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::FloatLiteral>(&f32, 2.f)));
+  type_params.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::FloatLiteral>(&f32, 3.f)));
+
+  ast::ExpressionList params;
+  params.push_back(std::make_unique<ast::TypeConstructorExpression>(
+      &vec, std::move(type_params)));
+
+  type_params.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::FloatLiteral>(&f32, 4.f)));
+  type_params.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::FloatLiteral>(&f32, 5.f)));
+  type_params.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::FloatLiteral>(&f32, 6.f)));
+  params.push_back(std::make_unique<ast::TypeConstructorExpression>(
+      &vec, std::move(type_params)));
+
+  ast::CallExpression expr(std::make_unique<ast::IdentifierExpression>(
+                               std::vector<std::string>{"std", param.name}),
+                           std::move(params));
+
+  Context ctx;
+  ast::Module mod;
+  TypeDeterminer td(&ctx, &mod);
+  mod.AddImport(std::make_unique<ast::Import>("GLSL.std.450", "std"));
+
+  ASSERT_TRUE(td.DetermineResultType(&expr)) << td.error();
+
+  GeneratorImpl g(&mod);
+  ASSERT_TRUE(g.EmitImportFunction(&expr)) << g.error();
+  EXPECT_EQ(g.result(),
+            std::string(param.hlsl_name) +
+                "(vector<float, 3>(1.00000000f, 2.00000000f, 3.00000000f), "
+                "vector<float, 3>(4.00000000f, 5.00000000f, 6.00000000f))");
+}
+INSTANTIATE_TEST_SUITE_P(HlslGeneratorImplTest,
+                         HlslImportData_DualParam_VectorTest,
+                         testing::Values(HlslImportData{"cross", "cross"}));
+
+using HlslImportData_DualParam_Int_Test =
+    testing::TestWithParam<HlslImportData>;
+TEST_P(HlslImportData_DualParam_Int_Test, IntScalar) {
+  auto param = GetParam();
+
+  ast::type::I32Type i32;
+
+  ast::ExpressionList params;
+  params.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::SintLiteral>(&i32, 1)));
+  params.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::SintLiteral>(&i32, 2)));
+
+  ast::CallExpression expr(std::make_unique<ast::IdentifierExpression>(
+                               std::vector<std::string>{"std", param.name}),
+                           std::move(params));
+
+  Context ctx;
+  ast::Module mod;
+  TypeDeterminer td(&ctx, &mod);
+  mod.AddImport(std::make_unique<ast::Import>("GLSL.std.450", "std"));
+
+  ASSERT_TRUE(td.DetermineResultType(&expr)) << td.error();
+
+  GeneratorImpl g(&mod);
+  ASSERT_TRUE(g.EmitImportFunction(&expr)) << g.error();
+  EXPECT_EQ(g.result(), std::string(param.hlsl_name) + "(1, 2)");
+}
+INSTANTIATE_TEST_SUITE_P(HlslGeneratorImplTest,
+                         HlslImportData_DualParam_Int_Test,
+                         testing::Values(HlslImportData{"smax", "max"},
+                                         HlslImportData{"smin", "min"},
+                                         HlslImportData{"umax", "max"},
+                                         HlslImportData{"umin", "min"}));
+
+using HlslImportData_TripleParamTest = testing::TestWithParam<HlslImportData>;
+TEST_P(HlslImportData_TripleParamTest, FloatScalar) {
+  auto param = GetParam();
+
+  ast::type::F32Type f32;
+
+  ast::ExpressionList params;
+  params.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::FloatLiteral>(&f32, 1.f)));
+  params.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::FloatLiteral>(&f32, 2.f)));
+  params.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::FloatLiteral>(&f32, 3.f)));
+
+  ast::CallExpression expr(std::make_unique<ast::IdentifierExpression>(
+                               std::vector<std::string>{"std", param.name}),
+                           std::move(params));
+
+  Context ctx;
+  ast::Module mod;
+  TypeDeterminer td(&ctx, &mod);
+  mod.AddImport(std::make_unique<ast::Import>("GLSL.std.450", "std"));
+
+  ASSERT_TRUE(td.DetermineResultType(&expr)) << td.error();
+
+  GeneratorImpl g(&mod);
+  ASSERT_TRUE(g.EmitImportFunction(&expr)) << g.error();
+  EXPECT_EQ(g.result(), std::string(param.hlsl_name) +
+                            "(1.00000000f, 2.00000000f, 3.00000000f)");
+}
+INSTANTIATE_TEST_SUITE_P(
+    HlslGeneratorImplTest,
+    HlslImportData_TripleParamTest,
+    testing::Values(HlslImportData{"faceforward", "faceforward"},
+                    HlslImportData{"fma", "fma"},
+                    HlslImportData{"fclamp", "clamp"},
+                    HlslImportData{"nclamp", "clamp"},
+                    HlslImportData{"smoothstep", "smoothstep"}));
+
+TEST_F(HlslGeneratorImplTest, DISABLED_HlslImportData_FMix) {
+  FAIL();
+}
+
+using HlslImportData_TripleParam_Int_Test =
+    testing::TestWithParam<HlslImportData>;
+TEST_P(HlslImportData_TripleParam_Int_Test, IntScalar) {
+  auto param = GetParam();
+
+  ast::type::I32Type i32;
+
+  ast::ExpressionList params;
+  params.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::SintLiteral>(&i32, 1)));
+  params.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::SintLiteral>(&i32, 2)));
+  params.push_back(std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::SintLiteral>(&i32, 3)));
+
+  ast::CallExpression expr(std::make_unique<ast::IdentifierExpression>(
+                               std::vector<std::string>{"std", param.name}),
+                           std::move(params));
+
+  Context ctx;
+  ast::Module mod;
+  TypeDeterminer td(&ctx, &mod);
+  mod.AddImport(std::make_unique<ast::Import>("GLSL.std.450", "std"));
+
+  ASSERT_TRUE(td.DetermineResultType(&expr)) << td.error();
+
+  GeneratorImpl g(&mod);
+  ASSERT_TRUE(g.EmitImportFunction(&expr)) << g.error();
+  EXPECT_EQ(g.result(), std::string(param.hlsl_name) + "(1, 2, 3)");
+}
+INSTANTIATE_TEST_SUITE_P(HlslGeneratorImplTest,
+                         HlslImportData_TripleParam_Int_Test,
+                         testing::Values(HlslImportData{"sclamp", "clamp"},
+                                         HlslImportData{"uclamp", "clamp"}));
+
+TEST_F(HlslGeneratorImplTest, HlslImportData_Determinant) {
+  ast::type::F32Type f32;
+  ast::type::MatrixType mat(&f32, 3, 3);
+
+  auto var = std::make_unique<ast::Variable>(
+      "var", ast::StorageClass::kFunction, &mat);
+
+  ast::ExpressionList params;
+  params.push_back(std::make_unique<ast::IdentifierExpression>("var"));
+
+  ast::CallExpression expr(std::make_unique<ast::IdentifierExpression>(
+                               std::vector<std::string>{"std", "determinant"}),
+                           std::move(params));
+
+  Context ctx;
+  ast::Module mod;
+  mod.AddGlobalVariable(std::move(var));
+  mod.AddImport(std::make_unique<ast::Import>("GLSL.std.450", "std"));
+
+  TypeDeterminer td(&ctx, &mod);
+  // Register the global
+  ASSERT_TRUE(td.Determine()) << td.error();
+  ASSERT_TRUE(td.DetermineResultType(&expr)) << td.error();
+
+  GeneratorImpl g(&mod);
+  ASSERT_TRUE(g.EmitImportFunction(&expr)) << g.error();
+  EXPECT_EQ(g.result(), std::string("determinant(var)"));
+}
+
+}  // namespace
+}  // namespace hlsl
+}  // namespace writer
+}  // namespace tint

src/writer/msl/generator_impl.cc

@@ -706,7 +706,6 @@ bool GeneratorImpl::EmitImportFunction(ast::CallExpression* expr) {
     case GLSLstd450Radians:
     case GLSLstd450RoundEven:
     case GLSLstd450SSign:
-    default:
       error_ = "Unknown import method: " + ident->name();
       return false;
   }