mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 15:02:46 +00:00
216e21a1fa
This isn't a complete conversion to ErrorOr<void>, but a good chunk. The end goal here is to propagate buffer allocation failures to the caller, and allow the use of TRY() with formatting functions.
312 lines
9.9 KiB
C++
312 lines
9.9 KiB
C++
/*
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* Copyright (c) 2021, Ali Mohammad Pur <mpfard@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/HashTable.h>
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#include <LibWasm/Forward.h>
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#include <LibWasm/Types.h>
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#if WASM_VALIDATOR_DEBUG
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# include <AK/SourceLocation.h>
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#endif
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namespace Wasm {
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struct Context {
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Vector<FunctionType> types;
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Vector<FunctionType> functions;
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Vector<TableType> tables;
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Vector<MemoryType> memories;
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Vector<GlobalType> globals;
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Vector<ValueType> elements;
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Vector<bool> datas;
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Vector<ValueType> locals;
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Vector<ResultType> labels;
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Optional<ResultType> return_;
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AK::HashTable<FunctionIndex> references;
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size_t imported_function_count { 0 };
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};
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struct ValidationError : public Error {
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ValidationError(String error)
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: Error(Error::from_string_literal(error))
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, error_string(move(error))
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{
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}
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String error_string;
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};
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class Validator {
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AK_MAKE_NONCOPYABLE(Validator);
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AK_MAKE_NONMOVABLE(Validator);
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public:
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Validator() = default;
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[[nodiscard]] Validator fork() const
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{
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return Validator { m_context };
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}
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// Module
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ErrorOr<void, ValidationError> validate(Module&);
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ErrorOr<void, ValidationError> validate(ImportSection const&);
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ErrorOr<void, ValidationError> validate(ExportSection const&);
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ErrorOr<void, ValidationError> validate(StartSection const&);
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ErrorOr<void, ValidationError> validate(DataSection const&);
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ErrorOr<void, ValidationError> validate(ElementSection const&);
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ErrorOr<void, ValidationError> validate(GlobalSection const&);
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ErrorOr<void, ValidationError> validate(MemorySection const&);
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ErrorOr<void, ValidationError> validate(TableSection const&);
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ErrorOr<void, ValidationError> validate(CodeSection const&);
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ErrorOr<void, ValidationError> validate(FunctionSection const&) { return {}; }
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ErrorOr<void, ValidationError> validate(DataCountSection const&) { return {}; }
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ErrorOr<void, ValidationError> validate(TypeSection const&) { return {}; }
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ErrorOr<void, ValidationError> validate(CustomSection const&) { return {}; }
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ErrorOr<void, ValidationError> validate(TypeIndex index) const
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{
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if (index.value() < m_context.types.size())
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return {};
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return Errors::invalid("TypeIndex"sv);
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}
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ErrorOr<void, ValidationError> validate(FunctionIndex index) const
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{
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if (index.value() < m_context.functions.size())
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return {};
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return Errors::invalid("FunctionIndex"sv);
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}
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ErrorOr<void, ValidationError> validate(MemoryIndex index) const
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{
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if (index.value() < m_context.memories.size())
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return {};
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return Errors::invalid("MemoryIndex"sv);
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}
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ErrorOr<void, ValidationError> validate(ElementIndex index) const
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{
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if (index.value() < m_context.elements.size())
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return {};
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return Errors::invalid("ElementIndex"sv);
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}
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ErrorOr<void, ValidationError> validate(DataIndex index) const
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{
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if (index.value() < m_context.datas.size())
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return {};
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return Errors::invalid("DataIndex"sv);
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}
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ErrorOr<void, ValidationError> validate(GlobalIndex index) const
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{
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if (index.value() < m_context.globals.size())
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return {};
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return Errors::invalid("GlobalIndex"sv);
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}
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ErrorOr<void, ValidationError> validate(LabelIndex index) const
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{
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if (index.value() < m_context.labels.size())
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return {};
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return Errors::invalid("LabelIndex"sv);
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}
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ErrorOr<void, ValidationError> validate(LocalIndex index) const
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{
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if (index.value() < m_context.locals.size())
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return {};
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return Errors::invalid("LocalIndex"sv);
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}
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ErrorOr<void, ValidationError> validate(TableIndex index) const
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{
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if (index.value() < m_context.tables.size())
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return {};
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return Errors::invalid("TableIndex"sv);
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}
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// Instructions
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struct StackEntry {
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StackEntry(ValueType type)
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: concrete_type(type)
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, is_known(true)
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{
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}
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explicit StackEntry()
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: concrete_type(ValueType::I32)
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, is_known(false)
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{
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}
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bool is_of_kind(ValueType::Kind kind) const
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{
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if (is_known)
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return concrete_type.kind() == kind;
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return true;
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}
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bool is_numeric() const { return !is_known || concrete_type.is_numeric(); }
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bool is_reference() const { return !is_known || concrete_type.is_reference(); }
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bool operator==(ValueType const& other) const
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{
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if (is_known)
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return concrete_type == other;
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return true;
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}
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bool operator==(StackEntry const& other) const
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{
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if (is_known && other.is_known)
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return other.concrete_type == concrete_type;
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return true;
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}
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ValueType concrete_type;
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bool is_known { true };
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};
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// This is a wrapper that can model "polymorphic" stacks,
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// by treating unknown stack entries as a potentially infinite number of entries
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class Stack : private Vector<StackEntry> {
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public:
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// The unknown entry will never be popped off, so we can safely use the original `is_empty`.
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using Vector<StackEntry>::is_empty;
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using Vector<StackEntry>::last;
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using Vector<StackEntry>::at;
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StackEntry take_last()
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{
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if (last().is_known)
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return Vector<StackEntry>::take_last();
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return last();
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}
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void append(StackEntry entry)
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{
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if (!entry.is_known)
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m_did_insert_unknown_entry = true;
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Vector<StackEntry>::append(entry);
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}
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size_t actual_size() const { return Vector<StackEntry>::size(); }
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size_t size() const { return m_did_insert_unknown_entry ? static_cast<size_t>(-1) : actual_size(); }
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Vector<StackEntry> release_vector() { return exchange(static_cast<Vector<StackEntry>&>(*this), Vector<StackEntry> {}); }
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bool operator==(Stack const& other) const;
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private:
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bool m_did_insert_unknown_entry { false };
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};
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struct ExpressionTypeResult {
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Vector<StackEntry> result_types;
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bool is_constant { false };
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};
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ErrorOr<ExpressionTypeResult, ValidationError> validate(Expression const&, Vector<ValueType> const&);
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ErrorOr<void, ValidationError> validate(Instruction const& instruction, Stack& stack, bool& is_constant);
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template<u32 opcode>
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ErrorOr<void, ValidationError> validate_instruction(Instruction const&, Stack& stack, bool& is_constant);
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// Types
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bool type_is_subtype_of(ValueType const& candidate_subtype, ValueType const& candidate_supertype);
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ErrorOr<void, ValidationError> validate(Limits const&, size_t k); // n <= 2^k-1 && m? <= 2^k-1
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ErrorOr<FunctionType, ValidationError> validate(BlockType const&);
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ErrorOr<void, ValidationError> validate(FunctionType const&) { return {}; }
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ErrorOr<void, ValidationError> validate(TableType const&);
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ErrorOr<void, ValidationError> validate(MemoryType const&);
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ErrorOr<void, ValidationError> validate(GlobalType const&) { return {}; }
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private:
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explicit Validator(Context context)
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: m_context(move(context))
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{
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}
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struct Errors {
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static ValidationError invalid(StringView name) { return String::formatted("Invalid {}", name); }
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template<typename Expected, typename Given>
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static ValidationError invalid(StringView name, Expected expected, Given given)
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{
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return String::formatted("Invalid {}, expected {} but got {}", name, expected, given);
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}
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template<typename... Args>
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static ValidationError non_conforming_types(StringView name, Args... args)
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{
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return String::formatted("Non-conforming types for {}: {}", name, Vector { args... });
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}
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static ValidationError duplicate_export_name(StringView name) { return String::formatted("Duplicate exported name '{}'", name); }
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template<typename T, typename U, typename V>
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static ValidationError out_of_bounds(StringView name, V value, T min, U max) { return String::formatted("Value {} for {} is out of bounds ({},{})", value, name, min, max); }
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#if WASM_VALIDATOR_DEBUG
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static ValidationError invalid_stack_state(SourceLocation location = SourceLocation::current());
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#else
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static ValidationError invalid_stack_state();
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#endif
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};
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enum class ChildScopeKind {
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Block,
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Loop,
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IfWithoutElse,
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IfWithElse,
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Else,
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};
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struct BlockDetails {
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size_t initial_stack_size { 0 };
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struct IfDetails {
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Stack initial_stack;
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Stack true_branch_stack;
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};
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Variant<IfDetails, Empty> details;
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};
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Context m_context;
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Vector<Context> m_parent_contexts;
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Vector<ChildScopeKind> m_entered_scopes;
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Vector<BlockDetails> m_block_details;
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Vector<FunctionType> m_entered_blocks;
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};
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}
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template<>
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struct AK::Formatter<Wasm::Validator::StackEntry> : public AK::Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& builder, Wasm::Validator::StackEntry const& value)
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{
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if (value.is_known)
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return Formatter<StringView>::format(builder, Wasm::ValueType::kind_name(value.concrete_type.kind()));
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return Formatter<StringView>::format(builder, "<unknown>"sv);
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}
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};
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template<>
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struct AK::Formatter<Wasm::ValueType> : public AK::Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& builder, Wasm::ValueType const& value)
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{
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return Formatter<StringView>::format(builder, Wasm::ValueType::kind_name(value.kind()));
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}
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};
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template<>
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struct AK::Formatter<Wasm::ValidationError> : public AK::Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& builder, Wasm::ValidationError const& error)
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{
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return Formatter<StringView>::format(builder, error.error_string);
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}
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};
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