// Copyright (c) 2018 Google LLC.

//

// 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 <algorithm>

#include "source/opcode.h"

#include "source/table2.h"

#include "source/val/instruction.h"

#include "source/val/validate.h"

#include "source/val/validation_state.h"

namespace spvtools {

namespace val {

namespace {

// Returns true if |a| and |b| are instructions defining pointers that point to

// types logically match and the decorations that apply to |b| are a subset

// of the decorations that apply to |a|.

bool DoPointeesLogicallyMatch(val::Instruction* a, val::Instruction* b,

                              ValidationState_t& _) {

  if (a->opcode() != spv::Op::OpTypePointer ||

      b->opcode() != spv::Op::OpTypePointer) {

    return false;

  }

  const auto& dec_a = _.id_decorations(a->id());

  const auto& dec_b = _.id_decorations(b->id());

  for (const auto& dec : dec_b) {

    if (std::find(dec_a.begin(), dec_a.end(), dec) == dec_a.end()) {

      return false;

    }

  }

  uint32_t a_type = a->GetOperandAs<uint32_t>(2);

  uint32_t b_type = b->GetOperandAs<uint32_t>(2);

  if (a_type == b_type) {

    return true;

  }

  Instruction* a_type_inst = _.FindDef(a_type);

  Instruction* b_type_inst = _.FindDef(b_type);

  return _.LogicallyMatch(a_type_inst, b_type_inst, true);

}

spv_result_t ValidateFunction(ValidationState_t& _, const Instruction* inst) {

  const auto function_type_id = inst->GetOperandAs<uint32_t>(3);

  const auto function_type = _.FindDef(function_type_id);

  if (!function_type || spv::Op::OpTypeFunction != function_type->opcode()) {

    return _.diag(SPV_ERROR_INVALID_ID, inst)

           << "OpFunction Function Type <id> " << _.getIdName(function_type_id)

           << " is not a function type.";

  }

  const auto return_id = function_type->GetOperandAs<uint32_t>(1);

  if (return_id != inst->type_id()) {

    return _.diag(SPV_ERROR_INVALID_ID, inst)

           << "OpFunction Result Type <id> " << _.getIdName(inst->type_id())

           << " does not match the Function Type's return type <id> "

           << _.getIdName(return_id) << ".";

  }

  const std::vector<spv::Op> acceptable = {

      spv::Op::OpGroupDecorate,

      spv::Op::OpDecorate,

      spv::Op::OpEnqueueKernel,

      spv::Op::OpEntryPoint,

      spv::Op::OpExecutionMode,

      spv::Op::OpExecutionModeId,

      spv::Op::OpFunctionCall,

      spv::Op::OpGetKernelNDrangeSubGroupCount,

      spv::Op::OpGetKernelNDrangeMaxSubGroupSize,

      spv::Op::OpGetKernelWorkGroupSize,

      spv::Op::OpGetKernelPreferredWorkGroupSizeMultiple,

      spv::Op::OpGetKernelLocalSizeForSubgroupCount,

      spv::Op::OpGetKernelMaxNumSubgroups,

      spv::Op::OpName,

      spv::Op::OpCooperativeMatrixPerElementOpNV,

      spv::Op::OpCooperativeMatrixReduceNV,

      spv::Op::OpCooperativeMatrixLoadTensorNV};

  for (auto& pair : inst->uses()) {

    const auto* use = pair.first;

    if (std::find(acceptable.begin(), acceptable.end(), use->opcode()) ==

            acceptable.end() &&

        !use->IsNonSemantic() && !use->IsDebugInfo()) {

      return _.diag(SPV_ERROR_INVALID_ID, use)

             << "Invalid use of function result id " << _.getIdName(inst->id())

             << ".";

    }

  }

  return SPV_SUCCESS;

}

spv_result_t ValidateFunctionParameter(ValidationState_t& _,

                                       const Instruction* inst) {

  // NOTE: Find OpFunction & ensure OpFunctionParameter is not out of place.

  size_t param_index = 0;

  size_t inst_num = inst->LineNum() - 1;

  if (inst_num == 0) {

    return _.diag(SPV_ERROR_INVALID_LAYOUT, inst)

           << "Function parameter cannot be the first instruction.";

  }

  auto func_inst = &_.ordered_instructions()[inst_num];

  while (--inst_num) {

    func_inst = &_.ordered_instructions()[inst_num];

    if (func_inst->opcode() == spv::Op::OpFunction) {

      break;

    } else if (func_inst->opcode() == spv::Op::OpFunctionParameter) {

      ++param_index;

    }

  }

  if (func_inst->opcode() != spv::Op::OpFunction) {

    return _.diag(SPV_ERROR_INVALID_LAYOUT, inst)

           << "Function parameter must be preceded by a function.";

  }

  const auto function_type_id = func_inst->GetOperandAs<uint32_t>(3);

  const auto function_type = _.FindDef(function_type_id);

  if (!function_type) {

    return _.diag(SPV_ERROR_INVALID_ID, func_inst)

           << "Missing function type definition.";

  }

  if (param_index >= function_type->words().size() - 3) {

    return _.diag(SPV_ERROR_INVALID_ID, inst)

           << "Too many OpFunctionParameters for " << func_inst->id()

           << ": expected " << function_type->words().size() - 3

           << " based on the function's type";

  }

  const auto param_type =

      _.FindDef(function_type->GetOperandAs<uint32_t>(param_index + 2));

  if (!param_type || inst->type_id() != param_type->id()) {

    return _.diag(SPV_ERROR_INVALID_ID, inst)

           << "OpFunctionParameter Result Type <id> "

           << _.getIdName(inst->type_id())

           << " does not match the OpTypeFunction parameter "

              "type of the same index.";

  }

  return SPV_SUCCESS;

}

spv_result_t ValidateFunctionCall(ValidationState_t& _,

                                  const Instruction* inst) {

  const auto function_id = inst->GetOperandAs<uint32_t>(2);

  const auto function = _.FindDef(function_id);

  if (!function || spv::Op::OpFunction != function->opcode()) {

    return _.diag(SPV_ERROR_INVALID_ID, inst)

           << "OpFunctionCall Function <id> " << _.getIdName(function_id)

           << " is not a function.";

  }

  auto return_type = _.FindDef(function->type_id());

  if (!return_type || return_type->id() != inst->type_id()) {

    return _.diag(SPV_ERROR_INVALID_ID, inst)

           << "OpFunctionCall Result Type <id> " << _.getIdName(inst->type_id())

           << "s type does not match Function <id> "

           << _.getIdName(return_type->id()) << "s return type.";

  }

  const auto function_type_id = function->GetOperandAs<uint32_t>(3);

  const auto function_type = _.FindDef(function_type_id);

  if (!function_type || function_type->opcode() != spv::Op::OpTypeFunction) {

    return _.diag(SPV_ERROR_INVALID_ID, inst)

           << "Missing function type definition.";

  }

  const auto function_call_arg_count = inst->words().size() - 4;

  const auto function_param_count = function_type->words().size() - 3;

  if (function_param_count != function_call_arg_count) {

    return _.diag(SPV_ERROR_INVALID_ID, inst)

           << "OpFunctionCall Function <id>'s parameter count does not match "

              "the argument count.";

  }

  for (size_t argument_index = 3, param_index = 2;

       argument_index < inst->operands().size();

       argument_index++, param_index++) {

    const auto argument_id = inst->GetOperandAs<uint32_t>(argument_index);

    const auto argument = _.FindDef(argument_id);

    if (!argument) {

      return _.diag(SPV_ERROR_INVALID_ID, inst)

             << "Missing argument " << argument_index - 3 << " definition.";

    }

    const auto argument_type = _.FindDef(argument->type_id());

    if (!argument_type) {

      return _.diag(SPV_ERROR_INVALID_ID, inst)

             << "Missing argument " << argument_index - 3

             << " type definition.";

    }

    const auto parameter_type_id =

        function_type->GetOperandAs<uint32_t>(param_index);

    const auto parameter_type = _.FindDef(parameter_type_id);

    if (!parameter_type || argument_type->id() != parameter_type->id()) {

      if (!parameter_type || !_.options()->before_hlsl_legalization ||

          !DoPointeesLogicallyMatch(argument_type, parameter_type, _)) {

        return _.diag(SPV_ERROR_INVALID_ID, inst)

               << "OpFunctionCall Argument <id> " << _.getIdName(argument_id)

               << "s type does not match Function <id> "

               << _.getIdName(parameter_type_id) << "s parameter type.";

      }

    }

    if (_.addressing_model() == spv::AddressingModel::Logical) {

      if ((parameter_type->opcode() == spv::Op::OpTypePointer ||

           parameter_type->opcode() == spv::Op::OpTypeUntypedPointerKHR) &&

          !_.options()->relax_logical_pointer) {

        spv::StorageClass sc =

            parameter_type->GetOperandAs<spv::StorageClass>(1u);

        // Validate which storage classes can be pointer operands.

        switch (sc) {

          case spv::StorageClass::UniformConstant:

          case spv::StorageClass::Function:

          case spv::StorageClass::Private:

          case spv::StorageClass::Workgroup:

          case spv::StorageClass::AtomicCounter:

            // These are always allowed.

            break;

          case spv::StorageClass::StorageBuffer:

            if (!_.features().variable_pointers) {

              return _.diag(SPV_ERROR_INVALID_ID, inst)

                     << "StorageBuffer pointer operand "

                     << _.getIdName(argument_id)

                     << " requires a variable pointers capability";

            }

            break;

          default:

            return _.diag(SPV_ERROR_INVALID_ID, inst)

                   << "Invalid storage class for pointer operand "

                   << _.getIdName(argument_id);

        }

        // Validate memory object declaration requirements.

        if (argument->opcode() != spv::Op::OpVariable &&

            argument->opcode() != spv::Op::OpUntypedVariableKHR &&

            argument->opcode() != spv::Op::OpFunctionParameter) {

          const bool ssbo_vptr =

              _.HasCapability(spv::Capability::VariablePointersStorageBuffer) &&

              sc == spv::StorageClass::StorageBuffer;

          const bool wg_vptr =

              _.HasCapability(spv::Capability::VariablePointers) &&

              sc == spv::StorageClass::Workgroup;

          const bool uc_ptr = sc == spv::StorageClass::UniformConstant;

          if (!_.options()->before_hlsl_legalization && !ssbo_vptr &&

              !wg_vptr && !uc_ptr) {

            return _.diag(SPV_ERROR_INVALID_ID, inst)

                   << "Pointer operand " << _.getIdName(argument_id)

                   << " must be a memory object declaration";

          }

        }

      }

    }

  }

  return SPV_SUCCESS;

}

spv_result_t ValidateCooperativeMatrixPerElementOp(ValidationState_t& _,

                                                   const Instruction* inst) {

  const auto function_id = inst->GetOperandAs<uint32_t>(3);

  const auto function = _.FindDef(function_id);

  if (!function || spv::Op::OpFunction != function->opcode()) {

    return _.diag(SPV_ERROR_INVALID_ID, inst)

           << "OpCooperativeMatrixPerElementOpNV Function <id> "

           << _.getIdName(function_id) << " is not a function.";

  }

  const auto matrix_id = inst->GetOperandAs<uint32_t>(2);

  const auto matrix = _.FindDef(matrix_id);

  const auto matrix_type_id = matrix->type_id();

  if (!_.IsCooperativeMatrixKHRType(matrix_type_id)) {

    return _.diag(SPV_ERROR_INVALID_ID, inst)

           << "OpCooperativeMatrixPerElementOpNV Matrix <id> "

           << _.getIdName(matrix_id) << " is not a cooperative matrix.";

  }

  const auto result_type_id = inst->GetOperandAs<uint32_t>(0);

  if (matrix_type_id != result_type_id) {

    return _.diag(SPV_ERROR_INVALID_ID, inst)

           << "OpCooperativeMatrixPerElementOpNV Result Type <id> "

           << _.getIdName(result_type_id) << " must match matrix type <id> "

           << _.getIdName(matrix_type_id) << ".";

  }

  const auto matrix_comp_type_id =

      _.FindDef(matrix_type_id)->GetOperandAs<uint32_t>(1);

  const auto function_type_id = function->GetOperandAs<uint32_t>(3);

  const auto function_type = _.FindDef(function_type_id);

  auto return_type_id = function_type->GetOperandAs<uint32_t>(1);

  if (return_type_id != matrix_comp_type_id) {

    return _.diag(SPV_ERROR_INVALID_ID, inst)

           << "OpCooperativeMatrixPerElementOpNV function return type <id> "

           << _.getIdName(return_type_id)

           << " must match matrix component type <id> "

           << _.getIdName(matrix_comp_type_id) << ".";

  }

  if (function_type->operands().size() < 5) {

    return _.diag(SPV_ERROR_INVALID_ID, inst)

           << "OpCooperativeMatrixPerElementOpNV function type <id> "

           << _.getIdName(function_type_id)

           << " must have a least three parameters.";

  }

  const auto param0_id = function_type->GetOperandAs<uint32_t>(2);

  const auto param1_id = function_type->GetOperandAs<uint32_t>(3);

  const auto param2_id = function_type->GetOperandAs<uint32_t>(4);

  if (!_.IsIntScalarType(param0_id) || _.GetBitWidth(param0_id) != 32) {

    return _.diag(SPV_ERROR_INVALID_ID, inst)

           << "OpCooperativeMatrixPerElementOpNV function type first parameter "

              "type <id> "

           << _.getIdName(param0_id) << " must be a 32-bit integer.";

  }

  if (!_.IsIntScalarType(param1_id) || _.GetBitWidth(param1_id) != 32) {

    return _.diag(SPV_ERROR_INVALID_ID, inst)

           << "OpCooperativeMatrixPerElementOpNV function type second "

              "parameter type <id> "

           << _.getIdName(param1_id) << " must be a 32-bit integer.";

  }

  if (param2_id != matrix_comp_type_id) {

    return _.diag(SPV_ERROR_INVALID_ID, inst)

           << "OpCooperativeMatrixPerElementOpNV function type third parameter "

              "type <id> "

           << _.getIdName(param2_id) << " must match matrix component type.";

  }

  return SPV_SUCCESS;

}

}  // namespace

spv_result_t FunctionPass(ValidationState_t& _, const Instruction* inst) {

  switch (inst->opcode()) {

    case spv::Op::OpFunction:

      if (auto error = ValidateFunction(_, inst)) return error;

      break;

    case spv::Op::OpFunctionParameter:

      if (auto error = ValidateFunctionParameter(_, inst)) return error;

      break;

    case spv::Op::OpFunctionCall:

      if (auto error = ValidateFunctionCall(_, inst)) return error;

      break;

    case spv::Op::OpCooperativeMatrixPerElementOpNV:

      if (auto error = ValidateCooperativeMatrixPerElementOp(_, inst))

        return error;

      break;

    default:

      break;

  }

  return SPV_SUCCESS;

}

}  // namespace val

}  // namespace spvtools