wasmparser/
limits.rs

1/* Copyright 2017 Mozilla Foundation
2 *
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16#![cfg_attr(not(feature = "validate"), allow(dead_code))]
17
18// The following limits are imposed by wasmparser on WebAssembly modules.
19// The limits are agreed upon with other engines for consistency.
20//
21// See https://webassembly.github.io/spec/js-api/#limits for details.
22pub const MAX_WASM_TYPES: usize = 1_000_000;
23pub const MAX_WASM_SUPERTYPES: usize = 1;
24pub const MAX_WASM_FUNCTIONS: usize = 1_000_000;
25pub const MAX_WASM_IMPORTS: usize = 1_000_000;
26pub const MAX_WASM_EXPORTS: usize = 1_000_000;
27pub const MAX_WASM_GLOBALS: usize = 1_000_000;
28pub const MAX_WASM_ELEMENT_SEGMENTS: usize = 100_000;
29pub const MAX_WASM_DATA_SEGMENTS: usize = 100_000;
30pub const MAX_WASM_STRING_SIZE: usize = 100_000;
31pub const MAX_WASM_FUNCTION_SIZE: usize = 7_654_321;
32pub const MAX_WASM_FUNCTION_LOCALS: u32 = 50000;
33pub const MAX_WASM_FUNCTION_PARAMS: usize = 1000;
34pub const MAX_WASM_FUNCTION_RETURNS: usize = 1000;
35pub const _MAX_WASM_TABLE_SIZE: usize = 10_000_000;
36pub const MAX_WASM_TABLE_ENTRIES: usize = 10_000_000;
37pub const MAX_WASM_TABLES: usize = 100;
38pub const MAX_WASM_MEMORIES: usize = 100;
39pub const MAX_WASM_TAGS: usize = 1_000_000;
40pub const MAX_WASM_BR_TABLE_SIZE: usize = MAX_WASM_FUNCTION_SIZE;
41pub const MAX_WASM_STRUCT_FIELDS: usize = 10_000;
42pub const MAX_WASM_CATCHES: usize = 10_000;
43pub const MAX_WASM_SUBTYPING_DEPTH: usize = 63;
44pub const MAX_WASM_HANDLERS: usize = 10_000;
45pub const MAX_WASM_TYPE_SIZE: u32 = 1_000_000;
46pub const MAX_WASM_SELECT_RESULT_SIZE: usize = 10; // values other than 1 are currently invalid
47
48pub const DEFAULT_WASM_PAGE_SIZE: u64 = 1 << 16;
49
50pub fn max_wasm_memory32_pages(page_size: u64) -> u64 {
51    assert!(page_size.is_power_of_two());
52    assert!(page_size <= DEFAULT_WASM_PAGE_SIZE);
53    u32::try_from((1_u128 << 32) / u128::from(page_size)).unwrap_or(u32::MAX) as u64
54}
55
56pub fn max_wasm_memory64_pages(page_size: u64) -> u64 {
57    assert!(page_size.is_power_of_two());
58    assert!(page_size <= DEFAULT_WASM_PAGE_SIZE);
59    u64::try_from((1_u128 << 64) / u128::from(page_size)).unwrap_or(u64::MAX)
60}
61
62// Component-related limits
63
64#[cfg(feature = "component-model")]
65pub use self::component_limits::*;
66#[cfg(feature = "component-model")]
67mod component_limits {
68    pub const MAX_WASM_MODULE_SIZE: usize = 1024 * 1024 * 1024; //= 1 GiB
69    pub const MAX_WASM_MODULE_TYPE_DECLS: usize = 100_000;
70    pub const MAX_WASM_COMPONENT_TYPE_DECLS: usize = 1_000_000;
71    pub const MAX_WASM_INSTANCE_TYPE_DECLS: usize = 1_000_000;
72    pub const MAX_WASM_RECORD_FIELDS: usize = 10_000;
73    pub const MAX_WASM_VARIANT_CASES: usize = 10_000;
74    pub const MAX_WASM_TUPLE_TYPES: usize = 10_000;
75    pub const MAX_WASM_FLAG_NAMES: usize = 1_000;
76    pub const MAX_WASM_ENUM_CASES: usize = 10_000;
77    pub const MAX_WASM_INSTANTIATION_EXPORTS: usize = 100_000;
78    pub const MAX_WASM_CANONICAL_OPTIONS: usize = 10;
79    pub const MAX_WASM_INSTANTIATION_ARGS: usize = 100_000;
80    pub const MAX_WASM_START_ARGS: usize = 1000;
81    pub const MAX_WASM_MODULES: usize = 1_000;
82    pub const MAX_WASM_COMPONENTS: usize = 1_000;
83    pub const MAX_WASM_INSTANCES: usize = 1_000;
84    pub const MAX_WASM_VALUES: usize = 1_000;
85
86    /// Core items in components such as globals/memories/tables don't actually
87    /// create new definitions but are instead just aliases to preexisting items.
88    /// This means they have a different limit than the core wasm based limits.
89    pub const MAX_CORE_INDEX_SPACE_ITEMS: usize = 1_000_000;
90}
wasmparser/limits.rs

wasmparser/
limits.rs
