// 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 "src/ast/assignment_statement.h"
#include "src/ast/binary_expression.h"
#include "src/ast/binding_decoration.h"
#include "src/ast/call_expression.h"
#include "src/ast/float_literal.h"
#include "src/ast/function.h"
#include "src/ast/identifier_expression.h"
#include "src/ast/if_statement.h"
#include "src/ast/location_decoration.h"
#include "src/ast/member_accessor_expression.h"
#include "src/ast/module.h"
#include "src/ast/pipeline_stage.h"
#include "src/ast/return_statement.h"
#include "src/ast/scalar_constructor_expression.h"
#include "src/ast/set_decoration.h"
#include "src/ast/sint_literal.h"
#include "src/ast/stage_decoration.h"
#include "src/ast/struct.h"
#include "src/ast/struct_block_decoration.h"
#include "src/ast/struct_member_offset_decoration.h"
#include "src/ast/type/access_control_type.h"
#include "src/ast/type/array_type.h"
#include "src/ast/type/f32_type.h"
#include "src/ast/type/i32_type.h"
#include "src/ast/type/struct_type.h"
#include "src/ast/type/vector_type.h"
#include "src/ast/type/void_type.h"
#include "src/ast/variable.h"
#include "src/ast/variable_decl_statement.h"
#include "src/ast/workgroup_decoration.h"
#include "src/type_determiner.h"
#include "src/writer/hlsl/test_helper.h"

namespace tint {
namespace writer {
namespace hlsl {
namespace {

using HlslGeneratorImplTest_Function = TestHelper;

TEST_F(HlslGeneratorImplTest_Function, Emit_Function) {
  auto* body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::ReturnStatement>(),
  });
  auto* func = create<ast::Function>(mod->RegisterSymbol("my_func"), "my_func",
                                     ast::VariableList{}, ty.void_, body,
                                     ast::FunctionDecorationList{});

  mod->AddFunction(func);
  gen.increment_indent();

  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"(  void my_func() {
    return;
  }

)");
}

TEST_F(HlslGeneratorImplTest_Function, Emit_Function_Name_Collision) {
  auto* body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::ReturnStatement>(),
  });
  auto* func = create<ast::Function>(
      mod->RegisterSymbol("GeometryShader"), "GeometryShader",
      ast::VariableList{}, ty.void_, body, ast::FunctionDecorationList{});

  mod->AddFunction(func);
  gen.increment_indent();

  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"(  void GeometryShader_tint_0() {
    return;
  }

)");
}

TEST_F(HlslGeneratorImplTest_Function, Emit_Function_WithParams) {
  ast::VariableList params;
  params.push_back(Var("a", ast::StorageClass::kNone, ty.f32));
  params.push_back(Var("b", ast::StorageClass::kNone, ty.i32));

  auto* body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::ReturnStatement>(),
  });
  auto* func =
      create<ast::Function>(mod->RegisterSymbol("my_func"), "my_func", params,
                            ty.void_, body, ast::FunctionDecorationList{});

  mod->AddFunction(func);
  gen.increment_indent();

  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"(  void my_func(float a, int b) {
    return;
  }

)");
}

TEST_F(HlslGeneratorImplTest_Function,
       Emit_FunctionDecoration_EntryPoint_WithInOutVars) {
  auto* foo_var = Var("foo", ast::StorageClass::kInput, ty.f32, nullptr,
                      ast::VariableDecorationList{
                          create<ast::LocationDecoration>(0),
                      });

  auto* bar_var = Var("bar", ast::StorageClass::kOutput, ty.f32, nullptr,
                      ast::VariableDecorationList{
                          create<ast::LocationDecoration>(1),
                      });

  td.RegisterVariableForTesting(foo_var);
  td.RegisterVariableForTesting(bar_var);

  mod->AddGlobalVariable(foo_var);
  mod->AddGlobalVariable(bar_var);

  ast::VariableList params;
  auto* body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::AssignmentStatement>(Expr("bar"), Expr("foo")),
      create<ast::ReturnStatement>(),
  });
  auto* func = create<ast::Function>(
      mod->RegisterSymbol("frag_main"), "frag_main", params, ty.void_, body,
      ast::FunctionDecorationList{
          create<ast::StageDecoration>(ast::PipelineStage::kFragment),
      });

  mod->AddFunction(func);

  ASSERT_TRUE(td.Determine()) << td.error();
  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"(struct frag_main_in {
  float foo : TEXCOORD0;
};

struct frag_main_out {
  float bar : SV_Target1;
};

frag_main_out frag_main(frag_main_in tint_in) {
  frag_main_out tint_out;
  tint_out.bar = tint_in.foo;
  return tint_out;
}

)");
}

TEST_F(HlslGeneratorImplTest_Function,
       Emit_FunctionDecoration_EntryPoint_WithInOut_Builtins) {
  auto* coord_var =
      Var("coord", ast::StorageClass::kInput, ty.vec4<f32>(), nullptr,
          ast::VariableDecorationList{
              create<ast::BuiltinDecoration>(ast::Builtin::kFragCoord),
          });

  auto* depth_var =
      Var("depth", ast::StorageClass::kOutput, ty.f32, nullptr,
          ast::VariableDecorationList{
              create<ast::BuiltinDecoration>(ast::Builtin::kFragDepth),
          });

  td.RegisterVariableForTesting(coord_var);
  td.RegisterVariableForTesting(depth_var);

  mod->AddGlobalVariable(coord_var);
  mod->AddGlobalVariable(depth_var);

  ast::VariableList params;
  auto* body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::AssignmentStatement>(Expr("depth"),
                                       MemberAccessor("coord", "x")),
      create<ast::ReturnStatement>(),
  });
  auto* func = create<ast::Function>(
      mod->RegisterSymbol("frag_main"), "frag_main", params, ty.void_, body,
      ast::FunctionDecorationList{
          create<ast::StageDecoration>(ast::PipelineStage::kFragment),
      });

  mod->AddFunction(func);

  ASSERT_TRUE(td.Determine()) << td.error();
  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"(struct frag_main_in {
  float4 coord : SV_Position;
};

struct frag_main_out {
  float depth : SV_Depth;
};

frag_main_out frag_main(frag_main_in tint_in) {
  frag_main_out tint_out;
  tint_out.depth = tint_in.coord.x;
  return tint_out;
}

)");
}

TEST_F(HlslGeneratorImplTest_Function,
       Emit_FunctionDecoration_EntryPoint_With_Uniform) {
  auto* coord_var =
      Var("coord", ast::StorageClass::kUniform, ty.vec4<f32>(), nullptr,
          ast::VariableDecorationList{
              create<ast::BindingDecoration>(0),
              create<ast::SetDecoration>(1),
          });

  td.RegisterVariableForTesting(coord_var);
  mod->AddGlobalVariable(coord_var);

  ast::VariableList params;
  auto* var = Var("v", ast::StorageClass::kFunction, ty.f32,
                  MemberAccessor("coord", "x"), ast::VariableDecorationList{});

  auto* body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::VariableDeclStatement>(var),
      create<ast::ReturnStatement>(),
  });
  auto* func = create<ast::Function>(
      mod->RegisterSymbol("frag_main"), "frag_main", params, ty.void_, body,
      ast::FunctionDecorationList{
          create<ast::StageDecoration>(ast::PipelineStage::kFragment),
      });

  mod->AddFunction(func);

  ASSERT_TRUE(td.Determine()) << td.error();
  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"(cbuffer cbuffer_coord : register(b0) {
  float4 coord;
};

void frag_main() {
  float v = coord.x;
  return;
}

)");
}

TEST_F(HlslGeneratorImplTest_Function,
       Emit_FunctionDecoration_EntryPoint_With_UniformStruct) {
  ast::StructMemberList members;
  members.push_back(create<ast::StructMember>(
      mod->RegisterSymbol("coord"), "coord", ty.vec4<f32>(),
      ast::StructMemberDecorationList{}));

  auto* str = create<ast::Struct>(members, ast::StructDecorationList{});

  ast::type::Struct s(mod->RegisterSymbol("Uniforms"), "Uniforms", str);

  auto* coord_var = Var("uniforms", ast::StorageClass::kUniform, &s, nullptr,
                        ast::VariableDecorationList{
                            create<ast::BindingDecoration>(0),
                            create<ast::SetDecoration>(1),
                        });

  mod->AddConstructedType(&s);

  td.RegisterVariableForTesting(coord_var);
  mod->AddGlobalVariable(coord_var);

  ast::VariableList params;
  auto* var = Var("v", ast::StorageClass::kFunction, ty.f32,
                  create<ast::MemberAccessorExpression>(
                      MemberAccessor("uniforms", "coord"), Expr("x")),
                  ast::VariableDecorationList{});

  auto* body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::VariableDeclStatement>(var),
      create<ast::ReturnStatement>(),
  });
  auto* func = create<ast::Function>(
      mod->RegisterSymbol("frag_main"), "frag_main", params, ty.void_, body,
      ast::FunctionDecorationList{
          create<ast::StageDecoration>(ast::PipelineStage::kFragment),
      });

  mod->AddFunction(func);

  ASSERT_TRUE(td.Determine()) << td.error();
  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"(struct Uniforms {
  float4 coord;
};

ConstantBuffer<Uniforms> uniforms : register(b0);

void frag_main() {
  float v = uniforms.coord.x;
  return;
}

)");
}

TEST_F(HlslGeneratorImplTest_Function,
       Emit_FunctionDecoration_EntryPoint_With_RW_StorageBuffer_Read) {
  ast::StructMemberList members;
  ast::StructMemberDecorationList a_deco;
  a_deco.push_back(create<ast::StructMemberOffsetDecoration>(0));
  members.push_back(
      create<ast::StructMember>(mod->RegisterSymbol("a"), "a", ty.i32, a_deco));

  ast::StructMemberDecorationList b_deco;
  b_deco.push_back(create<ast::StructMemberOffsetDecoration>(4));
  members.push_back(
      create<ast::StructMember>(mod->RegisterSymbol("b"), "b", ty.f32, b_deco));

  auto* str = create<ast::Struct>(members, ast::StructDecorationList{});

  ast::type::Struct s(mod->RegisterSymbol("Data"), "Data", str);
  ast::type::AccessControl ac(ast::AccessControl::kReadWrite, &s);

  auto* coord_var =
      Var("coord", ast::StorageClass::kStorageBuffer, &ac, nullptr,
          ast::VariableDecorationList{
              create<ast::BindingDecoration>(0),
              create<ast::SetDecoration>(1),
          });

  td.RegisterVariableForTesting(coord_var);
  mod->AddGlobalVariable(coord_var);

  ast::VariableList params;
  auto* var = Var("v", ast::StorageClass::kFunction, ty.f32,
                  MemberAccessor("coord", "b"), ast::VariableDecorationList{});

  auto* body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::VariableDeclStatement>(var),
      create<ast::ReturnStatement>(),
  });
  auto* func = create<ast::Function>(
      mod->RegisterSymbol("frag_main"), "frag_main", params, ty.void_, body,
      ast::FunctionDecorationList{
          create<ast::StageDecoration>(ast::PipelineStage::kFragment),
      });

  mod->AddFunction(func);

  ASSERT_TRUE(td.Determine()) << td.error();
  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"(RWByteAddressBuffer coord : register(u0);

void frag_main() {
  float v = asfloat(coord.Load(4));
  return;
}

)");
}

TEST_F(HlslGeneratorImplTest_Function,
       Emit_FunctionDecoration_EntryPoint_With_RO_StorageBuffer_Read) {
  ast::StructMemberList members;
  ast::StructMemberDecorationList a_deco;
  a_deco.push_back(create<ast::StructMemberOffsetDecoration>(0));
  members.push_back(
      create<ast::StructMember>(mod->RegisterSymbol("a"), "a", ty.i32, a_deco));

  ast::StructMemberDecorationList b_deco;
  b_deco.push_back(create<ast::StructMemberOffsetDecoration>(4));
  members.push_back(
      create<ast::StructMember>(mod->RegisterSymbol("b"), "b", ty.f32, b_deco));

  auto* str = create<ast::Struct>(members, ast::StructDecorationList{});

  ast::type::Struct s(mod->RegisterSymbol("Data"), "Data", str);
  ast::type::AccessControl ac(ast::AccessControl::kReadOnly, &s);

  auto* coord_var =
      Var("coord", ast::StorageClass::kStorageBuffer, &ac, nullptr,
          ast::VariableDecorationList{
              // decorations
              create<ast::BindingDecoration>(0),
              create<ast::SetDecoration>(1),
          });

  td.RegisterVariableForTesting(coord_var);
  mod->AddGlobalVariable(coord_var);

  ast::VariableList params;
  auto* var = Var("v", ast::StorageClass::kFunction, ty.f32,
                  MemberAccessor("coord", "b"), ast::VariableDecorationList{});

  auto* body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::VariableDeclStatement>(var),
      create<ast::ReturnStatement>(),
  });
  auto* func = create<ast::Function>(
      mod->RegisterSymbol("frag_main"), "frag_main", params, ty.void_, body,
      ast::FunctionDecorationList{
          create<ast::StageDecoration>(ast::PipelineStage::kFragment),
      });

  mod->AddFunction(func);

  ASSERT_TRUE(td.Determine()) << td.error();
  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"(ByteAddressBuffer coord : register(u0);

void frag_main() {
  float v = asfloat(coord.Load(4));
  return;
}

)");
}

TEST_F(HlslGeneratorImplTest_Function,
       Emit_FunctionDecoration_EntryPoint_With_StorageBuffer_Store) {
  ast::StructMemberList members;
  ast::StructMemberDecorationList a_deco;
  a_deco.push_back(create<ast::StructMemberOffsetDecoration>(0));
  members.push_back(
      create<ast::StructMember>(mod->RegisterSymbol("a"), "a", ty.i32, a_deco));

  ast::StructMemberDecorationList b_deco;
  b_deco.push_back(create<ast::StructMemberOffsetDecoration>(4));
  members.push_back(
      create<ast::StructMember>(mod->RegisterSymbol("b"), "b", ty.f32, b_deco));

  auto* str = create<ast::Struct>(members, ast::StructDecorationList{});

  ast::type::Struct s(mod->RegisterSymbol("Data"), "Data", str);
  ast::type::AccessControl ac(ast::AccessControl::kReadWrite, &s);

  auto* coord_var =
      Var("coord", ast::StorageClass::kStorageBuffer, &ac, nullptr,
          ast::VariableDecorationList{
              create<ast::BindingDecoration>(0),
              create<ast::SetDecoration>(1),
          });

  td.RegisterVariableForTesting(coord_var);

  mod->AddGlobalVariable(coord_var);

  auto* body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::AssignmentStatement>(MemberAccessor("coord", "b"),
                                       Expr(2.0f)),
      create<ast::ReturnStatement>(),
  });

  auto* func = create<ast::Function>(
      mod->RegisterSymbol("frag_main"), "frag_main", ast::VariableList{},
      ty.void_, body,
      ast::FunctionDecorationList{
          create<ast::StageDecoration>(ast::PipelineStage::kFragment),
      });

  mod->AddFunction(func);

  ASSERT_TRUE(td.Determine()) << td.error();
  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"(RWByteAddressBuffer coord : register(u0);

void frag_main() {
  coord.Store(4, asuint(2.0f));
  return;
}

)");
}

TEST_F(
    HlslGeneratorImplTest_Function,
    Emit_FunctionDecoration_Called_By_EntryPoints_WithLocationGlobals_And_Params) {  // NOLINT

  auto* foo_var = Var("foo", ast::StorageClass::kInput, ty.f32, nullptr,
                      ast::VariableDecorationList{
                          create<ast::LocationDecoration>(0),
                      });

  auto* bar_var = Var("bar", ast::StorageClass::kOutput, ty.f32, nullptr,
                      ast::VariableDecorationList{
                          create<ast::LocationDecoration>(1),
                      });

  auto* val_var = Var("val", ast::StorageClass::kOutput, ty.f32, nullptr,
                      ast::VariableDecorationList{
                          create<ast::LocationDecoration>(0),
                      });

  td.RegisterVariableForTesting(foo_var);
  td.RegisterVariableForTesting(bar_var);
  td.RegisterVariableForTesting(val_var);

  mod->AddGlobalVariable(foo_var);
  mod->AddGlobalVariable(bar_var);
  mod->AddGlobalVariable(val_var);

  ast::VariableList params;
  params.push_back(Var("param", ast::StorageClass::kFunction, ty.f32));

  auto* body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::AssignmentStatement>(Expr("bar"), Expr("foo")),
      create<ast::AssignmentStatement>(Expr("val"), Expr("param")),
      create<ast::ReturnStatement>(Expr("foo")),
  });
  auto* sub_func =
      create<ast::Function>(mod->RegisterSymbol("sub_func"), "sub_func", params,
                            ty.f32, body, ast::FunctionDecorationList{});

  mod->AddFunction(sub_func);

  body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::AssignmentStatement>(Expr("bar"), Call("sub_func", 1.0f)),
      create<ast::ReturnStatement>(),
  });
  auto* func_1 = create<ast::Function>(
      mod->RegisterSymbol("ep_1"), "ep_1", params, ty.void_, body,
      ast::FunctionDecorationList{
          create<ast::StageDecoration>(ast::PipelineStage::kFragment),
      });

  mod->AddFunction(func_1);

  ASSERT_TRUE(td.Determine()) << td.error();
  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"(struct ep_1_in {
  float foo : TEXCOORD0;
};

struct ep_1_out {
  float bar : SV_Target1;
  float val : SV_Target0;
};

float sub_func_ep_1(in ep_1_in tint_in, out ep_1_out tint_out, float param) {
  tint_out.bar = tint_in.foo;
  tint_out.val = param;
  return tint_in.foo;
}

ep_1_out ep_1(ep_1_in tint_in) {
  ep_1_out tint_out;
  tint_out.bar = sub_func_ep_1(tint_in, tint_out, 1.0f);
  return tint_out;
}

)");
}

TEST_F(HlslGeneratorImplTest_Function,
       Emit_FunctionDecoration_Called_By_EntryPoints_NoUsedGlobals) {
  auto* depth_var =
      Var("depth", ast::StorageClass::kOutput, ty.f32, nullptr,
          ast::VariableDecorationList{
              create<ast::BuiltinDecoration>(ast::Builtin::kFragDepth),
          });

  td.RegisterVariableForTesting(depth_var);

  mod->AddGlobalVariable(depth_var);

  ast::VariableList params;
  params.push_back(Var("param", ast::StorageClass::kFunction, ty.f32));

  auto* body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::ReturnStatement>(Expr("param")),
  });
  auto* sub_func =
      create<ast::Function>(mod->RegisterSymbol("sub_func"), "sub_func", params,
                            ty.f32, body, ast::FunctionDecorationList{});

  mod->AddFunction(sub_func);

  body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::AssignmentStatement>(Expr("depth"), Call("sub_func", 1.0f)),
      create<ast::ReturnStatement>(),
  });
  auto* func_1 = create<ast::Function>(
      mod->RegisterSymbol("ep_1"), "ep_1", params, ty.void_, body,
      ast::FunctionDecorationList{
          create<ast::StageDecoration>(ast::PipelineStage::kFragment),
      });

  mod->AddFunction(func_1);

  ASSERT_TRUE(td.Determine()) << td.error();
  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"(struct ep_1_out {
  float depth : SV_Depth;
};

float sub_func(float param) {
  return param;
}

ep_1_out ep_1() {
  ep_1_out tint_out;
  tint_out.depth = sub_func(1.0f);
  return tint_out;
}

)");
}

TEST_F(
    HlslGeneratorImplTest_Function,
    Emit_FunctionDecoration_Called_By_EntryPoints_WithBuiltinGlobals_And_Params) {  // NOLINT

  auto* coord_var =
      Var("coord", ast::StorageClass::kInput, ty.vec4<f32>(), nullptr,
          ast::VariableDecorationList{
              create<ast::BuiltinDecoration>(ast::Builtin::kFragCoord),
          });

  auto* depth_var =
      Var("depth", ast::StorageClass::kOutput, ty.f32, nullptr,
          ast::VariableDecorationList{
              create<ast::BuiltinDecoration>(ast::Builtin::kFragDepth),
          });

  td.RegisterVariableForTesting(coord_var);
  td.RegisterVariableForTesting(depth_var);

  mod->AddGlobalVariable(coord_var);
  mod->AddGlobalVariable(depth_var);

  ast::VariableList params;
  params.push_back(Var("param", ast::StorageClass::kFunction, ty.f32));

  auto* body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::AssignmentStatement>(Expr("depth"),
                                       MemberAccessor("coord", "x")),
      create<ast::ReturnStatement>(Expr("param")),
  });
  auto* sub_func =
      create<ast::Function>(mod->RegisterSymbol("sub_func"), "sub_func", params,
                            ty.f32, body, ast::FunctionDecorationList{});

  mod->AddFunction(sub_func);

  body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::AssignmentStatement>(Expr("depth"), Call("sub_func", 1.0f)),
      create<ast::ReturnStatement>(),
  });
  auto* func_1 = create<ast::Function>(
      mod->RegisterSymbol("ep_1"), "ep_1", params, ty.void_, body,
      ast::FunctionDecorationList{
          create<ast::StageDecoration>(ast::PipelineStage::kFragment),
      });

  mod->AddFunction(func_1);

  ASSERT_TRUE(td.Determine()) << td.error();
  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"(struct ep_1_in {
  float4 coord : SV_Position;
};

struct ep_1_out {
  float depth : SV_Depth;
};

float sub_func_ep_1(in ep_1_in tint_in, out ep_1_out tint_out, float param) {
  tint_out.depth = tint_in.coord.x;
  return param;
}

ep_1_out ep_1(ep_1_in tint_in) {
  ep_1_out tint_out;
  tint_out.depth = sub_func_ep_1(tint_in, tint_out, 1.0f);
  return tint_out;
}

)");
}

TEST_F(HlslGeneratorImplTest_Function,
       Emit_FunctionDecoration_Called_By_EntryPoint_With_Uniform) {
  auto* coord_var =
      Var("coord", ast::StorageClass::kUniform, ty.vec4<f32>(), nullptr,
          ast::VariableDecorationList{
              create<ast::BindingDecoration>(0),
              create<ast::SetDecoration>(1),
          });

  td.RegisterVariableForTesting(coord_var);

  mod->AddGlobalVariable(coord_var);

  ast::VariableList params;
  params.push_back(Var("param", ast::StorageClass::kFunction, ty.f32));

  auto* body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::ReturnStatement>(MemberAccessor("coord", "x")),
  });

  auto* sub_func =
      create<ast::Function>(mod->RegisterSymbol("sub_func"), "sub_func", params,
                            ty.f32, body, ast::FunctionDecorationList{});

  mod->AddFunction(sub_func);

  auto* var = Var("v", ast::StorageClass::kFunction, ty.f32,
                  Call("sub_func", 1.0f), ast::VariableDecorationList{});

  body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::VariableDeclStatement>(var),
      create<ast::ReturnStatement>(),
  });

  auto* func = create<ast::Function>(
      mod->RegisterSymbol("frag_main"), "frag_main", params, ty.void_, body,
      ast::FunctionDecorationList{
          create<ast::StageDecoration>(ast::PipelineStage::kFragment),
      });

  mod->AddFunction(func);

  ASSERT_TRUE(td.Determine()) << td.error();
  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"(cbuffer cbuffer_coord : register(b0) {
  float4 coord;
};

float sub_func(float param) {
  return coord.x;
}

void frag_main() {
  float v = sub_func(1.0f);
  return;
}

)");
}

TEST_F(HlslGeneratorImplTest_Function,
       Emit_FunctionDecoration_Called_By_EntryPoint_With_StorageBuffer) {
  ast::type::AccessControl ac(ast::AccessControl::kReadWrite, ty.vec4<f32>());
  auto* coord_var =
      Var("coord", ast::StorageClass::kStorageBuffer, &ac, nullptr,
          ast::VariableDecorationList{
              create<ast::BindingDecoration>(0),
              create<ast::SetDecoration>(1),
          });

  td.RegisterVariableForTesting(coord_var);

  mod->AddGlobalVariable(coord_var);

  ast::VariableList params;
  params.push_back(Var("param", ast::StorageClass::kFunction, ty.f32));

  auto* body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::ReturnStatement>(MemberAccessor("coord", "x")),
  });

  auto* sub_func =
      create<ast::Function>(mod->RegisterSymbol("sub_func"), "sub_func", params,
                            ty.f32, body, ast::FunctionDecorationList{});

  mod->AddFunction(sub_func);

  auto* var = Var("v", ast::StorageClass::kFunction, ty.f32,
                  Call("sub_func", 1.0f), ast::VariableDecorationList{});

  body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::VariableDeclStatement>(var),
      create<ast::ReturnStatement>(),
  });

  auto* func = create<ast::Function>(
      mod->RegisterSymbol("frag_main"), "frag_main", params, ty.void_, body,
      ast::FunctionDecorationList{
          create<ast::StageDecoration>(ast::PipelineStage::kFragment),
      });

  mod->AddFunction(func);

  ASSERT_TRUE(td.Determine()) << td.error();
  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"(RWByteAddressBuffer coord : register(u0);

float sub_func(float param) {
  return asfloat(coord.Load((4 * 0)));
}

void frag_main() {
  float v = sub_func(1.0f);
  return;
}

)");
}

TEST_F(HlslGeneratorImplTest_Function,
       Emit_FunctionDecoration_EntryPoints_WithGlobal_Nested_Return) {
  auto* bar_var = Var("bar", ast::StorageClass::kOutput, ty.f32, nullptr,
                      ast::VariableDecorationList{
                          create<ast::LocationDecoration>(1),
                      });

  td.RegisterVariableForTesting(bar_var);
  mod->AddGlobalVariable(bar_var);

  auto* list = create<ast::BlockStatement>(ast::StatementList{
      create<ast::ReturnStatement>(),
  });

  ast::VariableList params;
  auto* body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::AssignmentStatement>(Expr("bar"), Expr(1.0f)),
      create<ast::IfStatement>(create<ast::BinaryExpression>(
                                   ast::BinaryOp::kEqual, Expr(1), Expr(1)),
                               list, ast::ElseStatementList{}),
      create<ast::ReturnStatement>(),
  });

  auto* func_1 = create<ast::Function>(
      mod->RegisterSymbol("ep_1"), "ep_1", params, ty.void_, body,
      ast::FunctionDecorationList{
          create<ast::StageDecoration>(ast::PipelineStage::kFragment),
      });

  mod->AddFunction(func_1);

  ASSERT_TRUE(td.Determine()) << td.error();
  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"(struct ep_1_out {
  float bar : SV_Target1;
};

ep_1_out ep_1() {
  ep_1_out tint_out;
  tint_out.bar = 1.0f;
  if ((1 == 1)) {
    return tint_out;
  }
  return tint_out;
}

)");
}

TEST_F(HlslGeneratorImplTest_Function,
       Emit_FunctionDecoration_EntryPoint_WithNameCollision) {
  auto* func = create<ast::Function>(
      mod->RegisterSymbol("GeometryShader"), "GeometryShader",
      ast::VariableList{}, ty.void_,
      create<ast::BlockStatement>(ast::StatementList{}),
      ast::FunctionDecorationList{
          create<ast::StageDecoration>(ast::PipelineStage::kFragment),
      });

  mod->AddFunction(func);

  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"(void GeometryShader_tint_0() {
}

)");
}

TEST_F(HlslGeneratorImplTest_Function,
       Emit_FunctionDecoration_EntryPoint_Compute) {
  ast::VariableList params;
  auto* body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::ReturnStatement>(),
  });

  auto* func = create<ast::Function>(
      mod->RegisterSymbol("main"), "main", params, ty.void_, body,
      ast::FunctionDecorationList{
          create<ast::StageDecoration>(ast::PipelineStage::kCompute),
      });

  mod->AddFunction(func);

  ASSERT_TRUE(td.Determine()) << td.error();
  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"([numthreads(1, 1, 1)]
void main() {
  return;
}

)");
}

TEST_F(HlslGeneratorImplTest_Function,
       Emit_FunctionDecoration_EntryPoint_Compute_WithWorkgroup) {
  ast::VariableList params;
  auto* body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::ReturnStatement>(),
  });

  auto* func = create<ast::Function>(
      mod->RegisterSymbol("main"), "main", params, ty.void_, body,
      ast::FunctionDecorationList{
          create<ast::StageDecoration>(ast::PipelineStage::kCompute),
          create<ast::WorkgroupDecoration>(2u, 4u, 6u),
      });

  mod->AddFunction(func);

  ASSERT_TRUE(td.Determine()) << td.error();
  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"([numthreads(2, 4, 6)]
void main() {
  return;
}

)");
}

TEST_F(HlslGeneratorImplTest_Function, Emit_Function_WithArrayParams) {
  ast::type::Array ary(ty.f32, 5, ast::ArrayDecorationList{});

  ast::VariableList params;
  params.push_back(Var("a", ast::StorageClass::kNone, &ary));

  auto* body = create<ast::BlockStatement>(ast::StatementList{
      create<ast::ReturnStatement>(),
  });
  auto* func =
      create<ast::Function>(mod->RegisterSymbol("my_func"), "my_func", params,
                            ty.void_, body, ast::FunctionDecorationList{});

  mod->AddFunction(func);
  gen.increment_indent();

  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"(  void my_func(float a[5]) {
    return;
  }

)");
}

// https://crbug.com/tint/297
TEST_F(HlslGeneratorImplTest_Function,
       Emit_Multiple_EntryPoint_With_Same_ModuleVar) {
  // [[block]] struct Data {
  //   [[offset(0)]] d : f32;
  // };
  // [[binding(0), set(0)]] var<storage_buffer> data : Data;
  //
  // [[stage(compute)]]
  // fn a() -> void {
  //   return;
  // }
  //
  // [[stage(compute)]]
  // fn b() -> void {
  //   return;
  // }

  ast::StructMemberList members;
  ast::StructMemberDecorationList a_deco;
  a_deco.push_back(create<ast::StructMemberOffsetDecoration>(0));
  members.push_back(
      create<ast::StructMember>(mod->RegisterSymbol("d"), "d", ty.f32, a_deco));

  ast::StructDecorationList s_decos;
  s_decos.push_back(create<ast::StructBlockDecoration>());

  auto* str = create<ast::Struct>(members, s_decos);

  ast::type::Struct s(mod->RegisterSymbol("Data"), "Data", str);
  ast::type::AccessControl ac(ast::AccessControl::kReadWrite, &s);

  auto* data_var = Var("data", ast::StorageClass::kStorageBuffer, &ac, nullptr,
                       ast::VariableDecorationList{
                           create<ast::BindingDecoration>(0),
                           create<ast::SetDecoration>(0),
                       });

  mod->AddConstructedType(&s);
  td.RegisterVariableForTesting(data_var);
  mod->AddGlobalVariable(data_var);

  {
    ast::VariableList params;
    auto* var = Var("v", ast::StorageClass::kFunction, ty.f32,
                    MemberAccessor("data", "d"), ast::VariableDecorationList{});

    auto* body = create<ast::BlockStatement>(ast::StatementList{
        create<ast::VariableDeclStatement>(var),
        create<ast::ReturnStatement>(),
    });

    auto* func = create<ast::Function>(
        mod->RegisterSymbol("a"), "a", params, ty.void_, body,
        ast::FunctionDecorationList{
            create<ast::StageDecoration>(ast::PipelineStage::kCompute),
        });

    mod->AddFunction(func);
  }

  {
    ast::VariableList params;
    auto* var = Var("v", ast::StorageClass::kFunction, ty.f32,
                    MemberAccessor("data", "d"), ast::VariableDecorationList{});

    auto* body = create<ast::BlockStatement>(ast::StatementList{
        create<ast::VariableDeclStatement>(var),
        create<ast::ReturnStatement>(),
    });

    auto* func = create<ast::Function>(
        mod->RegisterSymbol("b"), "b", params, ty.void_, body,
        ast::FunctionDecorationList{
            create<ast::StageDecoration>(ast::PipelineStage::kCompute),
        });

    mod->AddFunction(func);
  }

  ASSERT_TRUE(td.Determine()) << td.error();
  ASSERT_TRUE(gen.Generate(out)) << gen.error();
  EXPECT_EQ(result(), R"(struct Data {
  float d;
};

RWByteAddressBuffer data : register(u0);

[numthreads(1, 1, 1)]
void a() {
  float v = asfloat(data.Load(0));
  return;
}

[numthreads(1, 1, 1)]
void b() {
  float v = asfloat(data.Load(0));
  return;
}

)");
}

}  // namespace
}  // namespace hlsl
}  // namespace writer
}  // namespace tint