// Copyright (c) 2015-2016 The Khronos Group Inc.

//

// 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 "source/val/validate.h"

#include <functional>

#include <iterator>

#include <memory>

#include <string>

#include <vector>

#include "source/binary.h"

#include "source/diagnostic.h"

#include "source/enum_string_mapping.h"

#include "source/extensions.h"

#include "source/opcode.h"

#include "source/spirv_constant.h"

#include "source/spirv_endian.h"

#include "source/spirv_target_env.h"

#include "source/val/construct.h"

#include "source/val/instruction.h"

#include "source/val/validation_state.h"

#include "spirv-tools/libspirv.h"

namespace {

// TODO(issue 1950): The validator only returns a single message anyway, so no

// point in generating more than 1 warning.

static uint32_t kDefaultMaxNumOfWarnings = 1;

}  // namespace

namespace spvtools {

namespace val {

namespace {

// Parses OpExtension instruction and registers extension.

void RegisterExtension(ValidationState_t& _,

                       const spv_parsed_instruction_t* inst) {

  const std::string extension_str = spvtools::GetExtensionString(inst);

  Extension extension;

  if (!GetExtensionFromString(extension_str.c_str(), &extension)) {

    // The error will be logged in the ProcessInstruction pass.

    return;

  }

  _.RegisterExtension(extension);

}

// Parses the beginning of the module searching for OpExtension instructions.

// Registers extensions if recognized. Returns SPV_REQUESTED_TERMINATION

// once an instruction which is not spv::Op::OpCapability and

// spv::Op::OpExtension is encountered. According to the SPIR-V spec extensions

// are declared after capabilities and before everything else.

spv_result_t ProcessExtensions(void* user_data,

                               const spv_parsed_instruction_t* inst) {

  const spv::Op opcode = static_cast<spv::Op>(inst->opcode);

  if (opcode == spv::Op::OpCapability) return SPV_SUCCESS;

  if (opcode == spv::Op::OpExtension) {

    ValidationState_t& _ = *(reinterpret_cast<ValidationState_t*>(user_data));

    RegisterExtension(_, inst);

    return SPV_SUCCESS;

  }

  // OpExtension block is finished, requesting termination.

  return SPV_REQUESTED_TERMINATION;

}

spv_result_t ProcessInstruction(void* user_data,

                                const spv_parsed_instruction_t* inst) {

  ValidationState_t& _ = *(reinterpret_cast<ValidationState_t*>(user_data));

  auto* instruction = _.AddOrderedInstruction(inst);

  _.RegisterDebugInstruction(instruction);

  return SPV_SUCCESS;

}

spv_result_t ValidateForwardDecls(ValidationState_t& _) {

  if (_.unresolved_forward_id_count() == 0) return SPV_SUCCESS;

  std::stringstream ss;

  std::vector<uint32_t> ids = _.UnresolvedForwardIds();

  std::transform(

      std::begin(ids), std::end(ids),

      std::ostream_iterator<std::string>(ss, " "),

      bind(&ValidationState_t::getIdName, std::ref(_), std::placeholders::_1));

  auto id_str = ss.str();

  return _.diag(SPV_ERROR_INVALID_ID, nullptr)

         << "The following forward referenced IDs have not been defined:\n"

         << id_str.substr(0, id_str.size() - 1);

}

// Entry point validation. Based on 2.16.1 (Universal Validation Rules) of the

// SPIRV spec:

// * There is at least one OpEntryPoint instruction, unless the Linkage

//   capability is being used.

// * No function can be targeted by both an OpEntryPoint instruction and an

//   OpFunctionCall instruction.

//

// Additionally enforces that entry points for Vulkan should not have recursion.

spv_result_t ValidateEntryPoints(ValidationState_t& _) {

  _.ComputeFunctionToEntryPointMapping();

  _.ComputeRecursiveEntryPoints();

  if (_.entry_points().empty() && !_.HasCapability(spv::Capability::Linkage)) {

    return _.diag(SPV_ERROR_INVALID_BINARY, nullptr)

           << "No OpEntryPoint instruction was found. This is only allowed if "

              "the Linkage capability is being used.";

  }

  for (const auto& entry_point : _.entry_points()) {

    if (_.IsFunctionCallTarget(entry_point)) {

      return _.diag(SPV_ERROR_INVALID_BINARY, _.FindDef(entry_point))

             << "A function (" << entry_point

             << ") may not be targeted by both an OpEntryPoint instruction and "

                "an OpFunctionCall instruction.";

    }

    // For Vulkan, the static function-call graph for an entry point

    // must not contain cycles.

    if (spvIsVulkanEnv(_.context()->target_env)) {

      if (_.recursive_entry_points().find(entry_point) !=

          _.recursive_entry_points().end()) {

        return _.diag(SPV_ERROR_INVALID_BINARY, _.FindDef(entry_point))

               << _.VkErrorID(4634)

               << "Entry points may not have a call graph with cycles.";

      }

    }

  }

  if (auto error = ValidateFloatControls2(_)) {

    return error;

  }

  if (auto error = ValidateDuplicateExecutionModes(_)) {

    return error;

  }

  return SPV_SUCCESS;

}

spv_result_t ValidateBinaryUsingContextAndValidationState(

    const spv_context_t& context, const uint32_t* words, const size_t num_words,

    spv_diagnostic* pDiagnostic, ValidationState_t* vstate) {

  auto binary = std::unique_ptr<spv_const_binary_t>(

      new spv_const_binary_t{words, num_words});

  spv_endianness_t endian;

  spv_position_t position = {};

  if (spvBinaryEndianness(binary.get(), &endian)) {

    return DiagnosticStream(position, context.consumer, "",

                            SPV_ERROR_INVALID_BINARY)

           << "Invalid SPIR-V magic number.";

  }

  spv_header_t header;

  if (spvBinaryHeaderGet(binary.get(), endian, &header)) {

    return DiagnosticStream(position, context.consumer, "",

                            SPV_ERROR_INVALID_BINARY)

           << "Invalid SPIR-V header.";

  }

  if (header.version > spvVersionForTargetEnv(context.target_env)) {

    return DiagnosticStream(position, context.consumer, "",

                            SPV_ERROR_WRONG_VERSION)

           << "Invalid SPIR-V binary version "

           << SPV_SPIRV_VERSION_MAJOR_PART(header.version) << "."

           << SPV_SPIRV_VERSION_MINOR_PART(header.version)

           << " for target environment "

           << spvTargetEnvDescription(context.target_env) << ".";

  }

  if (header.bound > vstate->options()->universal_limits_.max_id_bound) {

    return DiagnosticStream(position, context.consumer, "",

                            SPV_ERROR_INVALID_BINARY)

           << "Invalid SPIR-V.  The id bound is larger than the max id bound "

           << vstate->options()->universal_limits_.max_id_bound << ".";

  }

  // Look for OpExtension instructions and register extensions.

  // This parse should not produce any error messages. Hijack the context and

  // replace the message consumer so that we do not pollute any state in input

  // consumer.

  spv_context_t hijacked_context = context;

  hijacked_context.consumer = [](spv_message_level_t, const char*,

                                 const spv_position_t&, const char*) {};

  spvBinaryParse(&hijacked_context, vstate, words, num_words,

                 /* parsed_header = */ nullptr, ProcessExtensions,

                 /* diagnostic = */ nullptr);

  // Parse the module and perform inline validation checks. These checks do

  // not require the knowledge of the whole module.

  if (auto error = spvBinaryParse(&context, vstate, words, num_words,

                                  /*parsed_header =*/nullptr,

                                  ProcessInstruction, pDiagnostic)) {

    return error;

  }

  bool has_mask_task_nv = false;

  bool has_mask_task_ext = false;

  std::vector<Instruction*> visited_entry_points;

  for (auto& instruction : vstate->ordered_instructions()) {

    {

      // In order to do this work outside of Process Instruction we need to be

      // able to, briefly, de-const the instruction.

      Instruction* inst = const_cast<Instruction*>(&instruction);

      if (inst->opcode() == spv::Op::OpEntryPoint) {

        const auto entry_point = inst->GetOperandAs<uint32_t>(1);

        const auto execution_model = inst->GetOperandAs<spv::ExecutionModel>(0);

        const std::string desc_name = inst->GetOperandAs<std::string>(2);

        ValidationState_t::EntryPointDescription desc;

        desc.name = desc_name;

        std::vector<uint32_t> interfaces;

        for (size_t j = 3; j < inst->operands().size(); ++j)

          desc.interfaces.push_back(inst->word(inst->operand(j).offset));

        vstate->RegisterEntryPoint(entry_point, execution_model,

                                   std::move(desc));

        if (visited_entry_points.size() > 0) {

          for (const Instruction* check_inst : visited_entry_points) {

            const auto check_execution_model =

                check_inst->GetOperandAs<spv::ExecutionModel>(0);

            const std::string check_name =

                check_inst->GetOperandAs<std::string>(2);

            if (desc_name == check_name &&

                execution_model == check_execution_model) {

              return vstate->diag(SPV_ERROR_INVALID_DATA, inst)

                     << "2 Entry points cannot share the same name and "

                        "ExecutionMode.";

            }

          }

        }

        visited_entry_points.push_back(inst);

        has_mask_task_nv |= (execution_model == spv::ExecutionModel::TaskNV ||

                             execution_model == spv::ExecutionModel::MeshNV);

        has_mask_task_ext |= (execution_model == spv::ExecutionModel::TaskEXT ||

                              execution_model == spv::ExecutionModel::MeshEXT);

      }

      if (inst->opcode() == spv::Op::OpFunctionCall) {

        if (!vstate->in_function_body()) {

          return vstate->diag(SPV_ERROR_INVALID_LAYOUT, &instruction)

                 << "A FunctionCall must happen within a function body.";

        }

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

        vstate->AddFunctionCallTarget(called_id);

      }

      if (vstate->in_function_body()) {

        inst->set_function(&(vstate->current_function()));

        inst->set_block(vstate->current_function().current_block());

        if (vstate->in_block() && spvOpcodeIsBlockTerminator(inst->opcode())) {

          vstate->current_function().current_block()->set_terminator(inst);

        }

      }

      if (auto error = IdPass(*vstate, inst)) return error;

    }

    if (auto error = CapabilityPass(*vstate, &instruction)) return error;

    if (auto error = ModuleLayoutPass(*vstate, &instruction)) return error;

    if (auto error = CfgPass(*vstate, &instruction)) return error;

    if (auto error = InstructionPass(*vstate, &instruction)) return error;

    // Now that all of the checks are done, update the state.

    {

      Instruction* inst = const_cast<Instruction*>(&instruction);

      vstate->RegisterInstruction(inst);

      if (inst->opcode() == spv::Op::OpTypeForwardPointer) {

        vstate->RegisterForwardPointer(inst->GetOperandAs<uint32_t>(0));

      }

    }

  }

  if (!vstate->has_memory_model_specified())

    return vstate->diag(SPV_ERROR_INVALID_LAYOUT, nullptr)

           << "Missing required OpMemoryModel instruction.";

  if (vstate->in_function_body())

    return vstate->diag(SPV_ERROR_INVALID_LAYOUT, nullptr)

           << "Missing OpFunctionEnd at end of module.";

  if (vstate->HasCapability(spv::Capability::BindlessTextureNV) &&

      !vstate->has_samplerimage_variable_address_mode_specified())

    return vstate->diag(SPV_ERROR_INVALID_LAYOUT, nullptr)

           << "Missing required OpSamplerImageAddressingModeNV instruction.";

  if (has_mask_task_ext && has_mask_task_nv)

    return vstate->diag(SPV_ERROR_INVALID_LAYOUT, nullptr)

           << vstate->VkErrorID(7102)

           << "Module can't mix MeshEXT/TaskEXT with MeshNV/TaskNV Execution "

              "Model.";

  // Catch undefined forward references before performing further checks.

  if (auto error = ValidateForwardDecls(*vstate)) return error;

  // Calculate reachability after all the blocks are parsed, but early that it

  // can be relied on in subsequent pases.

  ReachabilityPass(*vstate);

  // ID usage needs be handled in its own iteration of the instructions,

  // between the two others. It depends on the first loop to have been

  // finished, so that all instructions have been registered. And the following

  // loop depends on all of the usage data being populated. Thus it cannot live

  // in either of those iterations.

  // It should also live after the forward declaration check, since it will

  // have problems with missing forward declarations, but give less useful error

  // messages.

  for (size_t i = 0; i < vstate->ordered_instructions().size(); ++i) {

    auto& instruction = vstate->ordered_instructions()[i];

    if (auto error = UpdateIdUse(*vstate, &instruction)) return error;

  }

  // Validate individual opcodes.

  for (size_t i = 0; i < vstate->ordered_instructions().size(); ++i) {

    auto& instruction = vstate->ordered_instructions()[i];

    // Keep these passes in the order they appear in the SPIR-V specification

    // sections to maintain test consistency.

    if (auto error = MiscPass(*vstate, &instruction)) return error;

    if (auto error = DebugPass(*vstate, &instruction)) return error;

    if (auto error = AnnotationPass(*vstate, &instruction)) return error;

    if (auto error = ExtensionPass(*vstate, &instruction)) return error;

    if (auto error = ModeSettingPass(*vstate, &instruction)) return error;

    if (auto error = TypePass(*vstate, &instruction)) return error;

    if (auto error = ConstantPass(*vstate, &instruction)) return error;

    if (auto error = MemoryPass(*vstate, &instruction)) return error;

    if (auto error = FunctionPass(*vstate, &instruction)) return error;

    if (auto error = ImagePass(*vstate, &instruction)) return error;

    if (auto error = ConversionPass(*vstate, &instruction)) return error;

    if (auto error = CompositesPass(*vstate, &instruction)) return error;

    if (auto error = ArithmeticsPass(*vstate, &instruction)) return error;

    if (auto error = BitwisePass(*vstate, &instruction)) return error;

    if (auto error = LogicalsPass(*vstate, &instruction)) return error;

    if (auto error = ControlFlowPass(*vstate, &instruction)) return error;

    if (auto error = DerivativesPass(*vstate, &instruction)) return error;

    if (auto error = AtomicsPass(*vstate, &instruction)) return error;

    if (auto error = PrimitivesPass(*vstate, &instruction)) return error;

    if (auto error = BarriersPass(*vstate, &instruction)) return error;

    // Group

    // Device-Side Enqueue

    // Pipe

    if (auto error = NonUniformPass(*vstate, &instruction)) return error;

    if (auto error = LiteralsPass(*vstate, &instruction)) return error;

    if (auto error = RayQueryPass(*vstate, &instruction)) return error;

    if (auto error = RayTracingPass(*vstate, &instruction)) return error;

    if (auto error = RayReorderNVPass(*vstate, &instruction)) return error;

    if (auto error = MeshShadingPass(*vstate, &instruction)) return error;

    if (auto error = TensorLayoutPass(*vstate, &instruction)) return error;

  }

  // Validate the preconditions involving adjacent instructions. e.g.

  // spv::Op::OpPhi must only be preceded by spv::Op::OpLabel, spv::Op::OpPhi,

  // or spv::Op::OpLine.

  if (auto error = ValidateAdjacency(*vstate)) return error;

  if (auto error = ValidateEntryPoints(*vstate)) return error;

  // CFG checks are performed after the binary has been parsed

  // and the CFGPass has collected information about the control flow

  if (auto error = PerformCfgChecks(*vstate)) return error;

  if (auto error = CheckIdDefinitionDominateUse(*vstate)) return error;

  if (auto error = ValidateDecorations(*vstate)) return error;

  if (auto error = ValidateInterfaces(*vstate)) return error;

  // TODO(dsinclair): Restructure ValidateBuiltins so we can move into the

  // for() above as it loops over all ordered_instructions internally.

  if (auto error = ValidateBuiltIns(*vstate)) return error;

  // These checks must be performed after individual opcode checks because

  // those checks register the limitation checked here.

  for (const auto& inst : vstate->ordered_instructions()) {

    if (auto error = ValidateExecutionLimitations(*vstate, &inst)) return error;

    if (auto error = ValidateSmallTypeUses(*vstate, &inst)) return error;

    if (auto error = ValidateQCOMImageProcessingTextureUsages(*vstate, &inst))

      return error;

  }

  return SPV_SUCCESS;

}

}  // namespace

spv_result_t ValidateBinaryAndKeepValidationState(

    const spv_const_context context, spv_const_validator_options options,

    const uint32_t* words, const size_t num_words, spv_diagnostic* pDiagnostic,

    std::unique_ptr<ValidationState_t>* vstate) {

  spv_context_t hijack_context = *context;

  if (pDiagnostic) {

    *pDiagnostic = nullptr;

    UseDiagnosticAsMessageConsumer(&hijack_context, pDiagnostic);

  }

  vstate->reset(new ValidationState_t(&hijack_context, options, words,

                                      num_words, kDefaultMaxNumOfWarnings));

  return ValidateBinaryUsingContextAndValidationState(

      hijack_context, words, num_words, pDiagnostic, vstate->get());

}

}  // namespace val

}  // namespace spvtools

spv_result_t spvValidate(const spv_const_context context,

                         const spv_const_binary binary,

                         spv_diagnostic* pDiagnostic) {

  return spvValidateBinary(context, binary->code, binary->wordCount,

                           pDiagnostic);

}

spv_result_t spvValidateBinary(const spv_const_context context,

                               const uint32_t* words, const size_t num_words,

                               spv_diagnostic* pDiagnostic) {

  spv_context_t hijack_context = *context;

  if (pDiagnostic) {

    *pDiagnostic = nullptr;

    spvtools::UseDiagnosticAsMessageConsumer(&hijack_context, pDiagnostic);

  }

  // This interface is used for default command line options.

  spv_validator_options default_options = spvValidatorOptionsCreate();

  // Create the ValidationState using the context and default options.

  spvtools::val::ValidationState_t vstate(&hijack_context, default_options,

                                          words, num_words,

                                          kDefaultMaxNumOfWarnings);

  spv_result_t result =

      spvtools::val::ValidateBinaryUsingContextAndValidationState(

          hijack_context, words, num_words, pDiagnostic, &vstate);

  spvValidatorOptionsDestroy(default_options);

  return result;

}

spv_result_t spvValidateWithOptions(const spv_const_context context,

                                    spv_const_validator_options options,

                                    const spv_const_binary binary,

                                    spv_diagnostic* pDiagnostic) {

  spv_context_t hijack_context = *context;

  if (pDiagnostic) {

    *pDiagnostic = nullptr;

    spvtools::UseDiagnosticAsMessageConsumer(&hijack_context, pDiagnostic);

  }

  // Create the ValidationState using the context.

  spvtools::val::ValidationState_t vstate(&hijack_context, options,

                                          binary->code, binary->wordCount,

                                          kDefaultMaxNumOfWarnings);

  return spvtools::val::ValidateBinaryUsingContextAndValidationState(

      hijack_context, binary->code, binary->wordCount, pDiagnostic, &vstate);

}