// SPDX-License-Identifier: Apache-2.0

// SPDX-FileCopyrightText: Copyright The WasmEdge Authors

//===-- wasmedge/validator/validator.h - validator class definition -------===//

//

// Part of the WasmEdge Project.

//

//===----------------------------------------------------------------------===//

///

/// \file

/// This file contains the declaration of the validator class, which controls

/// the flow of WASM validation.

///

//===----------------------------------------------------------------------===//

#pragma once

#include "ast/component/component.h"

#include "ast/module.h"

#include "common/configure.h"

#include "validator/component_context.h"

#include "validator/formchecker.h"

#include <cstdint>

#include <vector>

namespace WasmEdge {

namespace Validator {

/// Validator flow control class.

class Validator {

public:

  Validator(const Configure &Conf) noexcept : Conf(Conf) {}

  ~Validator() noexcept = default;

  /// Validate AST::Module.

  Expect<void> validate(const AST::Module &Mod);

  /// Validate AST::Component.

  Expect<void> validate(const AST::Component::Component &Comp) noexcept;

private:

  /// \name Validate WASM AST nodes

  /// @{

  // Validate AST::Types

  Expect<void> validate(const AST::SubType &Type, uint32_t OwnTypeIdx,

                        std::vector<uint32_t> &SubTypeDepthMap,

                        const std::vector<const AST::SubType *> &TypeVec);

  Expect<void> validate(const AST::Limit &Lim);

  Expect<void> validate(const AST::TableType &Tab);

  Expect<void> validate(const AST::MemoryType &Mem);

  Expect<void> validate(const AST::GlobalType &Glob);

  // Validate AST::Segments

  Expect<void> validate(const AST::TableSegment &TabSeg);

  Expect<void> validate(const AST::GlobalSegment &GlobSeg);

  Expect<void> validate(const AST::ElementSegment &ElemSeg);

  Expect<void> validate(const AST::CodeSegment &CodeSeg,

                        const uint32_t TypeIdx);

  Expect<void> validate(const AST::DataSegment &DataSeg);

  // Validate AST::Desc

  Expect<void> validate(const AST::ImportDesc &ImpDesc);

  Expect<void> validate(const AST::ExportDesc &ExpDesc);

  // Validate AST::Sections

  Expect<void> validate(const AST::TypeSection &TypeSec);

  Expect<void> validate(const AST::ImportSection &ImportSec);

  Expect<void> validate(const AST::FunctionSection &FuncSec);

  Expect<void> validate(const AST::TableSection &TabSec);

  Expect<void> validate(const AST::MemorySection &MemSec);

  Expect<void> validate(const AST::GlobalSection &GlobSec);

  Expect<void> validate(const AST::ElementSection &ElemSec);

  Expect<void> validate(const AST::CodeSection &CodeSec);

  Expect<void> validate(const AST::DataSection &DataSec);

  Expect<void> validate(const AST::StartSection &StartSec);

  Expect<void> validate(const AST::ExportSection &ExportSec);

  Expect<void> validate(const AST::TagSection &TagSec);

  // Validate const expression

  Expect<void> validateConstExpr(AST::InstrView Instrs,

                                 Span<const ValType> Returns);

  /// @}

  /// \name Validate Component Model AST nodes

  /// @{

  // Validate a component body in a fresh scope, into the caller's shape.

  Expect<void> validate(const AST::Component::Component &Comp,

                        Component::Shape &Out) noexcept;

  // Validate component sections

  Expect<void>

  validate(const AST::Component::CoreModuleSection &ModSec) noexcept;

  Expect<void>

  validate(const AST::Component::CoreInstanceSection &InstSec) noexcept;

  Expect<void>

  validate(const AST::Component::CoreTypeSection &TypeSec) noexcept;

  Expect<void>

  validate(const AST::Component::ComponentSection &CompSec) noexcept;

  Expect<void>

  validate(const AST::Component::InstanceSection &InstSec) noexcept;

  Expect<void> validate(const AST::Component::AliasSection &AliasSec) noexcept;

  Expect<void> validate(const AST::Component::TypeSection &TypeSec) noexcept;

  Expect<void> validate(const AST::Component::CanonSection &CanonSec) noexcept;

  Expect<void> validate(const AST::Component::StartSection &StartSec) noexcept;

  // Imports and exports accumulate into the component's own external type.

  Expect<void> validate(const AST::Component::ImportSection &ImpSec,

                        Component::Shape &Out) noexcept;

  Expect<void> validate(const AST::Component::ExportSection &ExpSec,

                        Component::Shape &Out) noexcept;

  Expect<void> validate(const AST::Component::ValueSection &ValSec) noexcept;

  // Validate component core:instance and instance

  Expect<void> validate(const AST::Component::CoreInstance &Inst) noexcept;

  Expect<void> validate(const AST::Component::Instance &Inst) noexcept;

  // Validate component core:alias and alias

  Expect<void> validate(const AST::Component::CoreAlias &Alias) noexcept;

  Expect<void> validate(const AST::Component::Alias &Alias) noexcept;

  // Validate component core:deftype and deftype

  Expect<void> validate(const AST::Component::CoreDefType &DType) noexcept;

  Expect<void> validate(const AST::Component::DefType &DType) noexcept;

  // Validate component canonical

  Expect<void> validate(const AST::Component::Canonical &Canon) noexcept;

  // Validate component import/export

  Expect<void> validate(const AST::Component::Import &Im,

                        Component::Shape &Out) noexcept;

  Expect<void> validate(const AST::Component::Export &Ex,

                        Component::Shape &Out) noexcept;

  // Resolve descriptors into typed views; a sub-resource bound gets a fresh id.

  Expect<void> validate(const AST::Component::CoreImportDesc &Desc,

                        Component::CoreExternInfo &Out) noexcept;

  Expect<void> validate(const AST::Component::ExternDesc &Desc, bool IsImport,

                        Component::ExternInfo &Out) noexcept;

  // Validate type declaration bodies into the caller-provided shape.

  Expect<void> validate(Span<const AST::Component::CoreModuleDecl> Decls,

                        Component::CoreShape &Out) noexcept;

  Expect<void> validate(const AST::Component::InstanceType &IT,

                        Component::Shape &Out) noexcept;

  Expect<void> validate(const AST::Component::ComponentType &CT,

                        Component::Shape &Out) noexcept;

  Expect<void> validate(const AST::Component::InstanceDecl &Decl,

                        std::map<std::string, Component::ExternInfo,

                                 std::less<>> &Exports) noexcept;

  Expect<void> validate(const AST::Component::ComponentDecl &Decl,

                        Component::Shape &Out) noexcept;

  // Validate component value types and type definitions

  Expect<void> validate(const ComponentValType &VT) noexcept;

  Expect<void> validate(const AST::Component::DefValType &DVT) noexcept;

  Expect<void> validate(const AST::Component::FuncType &FT) noexcept;

  Expect<void> validate(const AST::Component::ResourceType &RT) noexcept;

  /// @}

  /// Memory page limit for WASM32 and WASM64

  static inline const uint64_t LIMIT_MEMORYTYPE_LIM64 = UINT64_C(1) << 48;

  static inline const uint32_t LIMIT_MEMORYTYPE_LIM32 = UINT32_C(1) << 16;

  /// Proposal configure

  const Configure Conf;

  /// Formal checker

  FormChecker Checker;

  /// Type system for Component validation

  Component::TypeSystem CompTypes;

  /// Per-component state for Component validation

  Component::Context CompCtx{CompTypes};

};

} // namespace Validator

} // namespace WasmEdge