d4ed658429
The plan is to start caching compiled JS bytecode on disk. Before loading anything from a cache we need confidence that the bytes are structurally well-formed, since a corrupted or tampered-with cache file could otherwise hand the interpreter an out-of-bounds jump or a constant-pool index that points past the end of the table. This commit lays down the scaffolding for that validator. The walker lives in Rust (Libraries/LibJS/Rust/src/bytecode/validator.rs) so that it can share the existing Bytecode.def-driven layout machinery with the encoder. C++ calls into it through cbindgen, the same way the rest of the Rust pipeline is wired up. For now, the validator only does Pass 1: walk the byte stream, verify each instruction is 8-byte aligned, the opcode byte is in range, and the reported length keeps us inside the buffer. The length lookup is generated from Bytecode.def so fixed-length and variable-length instructions stay in sync with the rest of the codegen automatically. Per-field bounds checks (operands, labels, table indices, cache indices) and structural extras (basic block offsets, exception handlers, source map) come in follow-up commits. The validator runs after every successful compilation in debug and sanitizer builds, gated on !NDEBUG || HAS_ADDRESS_SANITIZER, so we get an extra sanity check on every executable the encoder produces without paying for it in release builds. Failure trips a VERIFY_NOT_REACHED with the offset, opcode, and error category logged via dbgln().
20 lines
507 B
TOML
20 lines
507 B
TOML
language = "C++"
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header = """/*
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* Copyright (c) 2026-present, the Ladybird developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/"""
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pragma_once = true
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include_version = true
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namespaces = ["JS", "FFI"]
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line_length = 120
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tab_width = 4
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no_includes = true
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sys_includes = ["stdint.h", "stddef.h"]
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usize_is_size_t = true
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[export]
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include = ["AbstractOperationKind", "ConstantTag", "LiteralValueKind", "ValidationErrorKind", "WellKnownSymbolKind", "FFIToken"]
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[export.mangle]
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rename_types = "PascalCase"
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