1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143
use crate::{
encode_section, Encode, GlobalType, MemoryType, Section, SectionId, TableType, TagType,
CORE_FUNCTION_SORT, CORE_GLOBAL_SORT, CORE_MEMORY_SORT, CORE_TABLE_SORT, CORE_TAG_SORT,
};
/// The type of an entity.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum EntityType {
/// A function type.
///
/// The value is an index into the types section.
Function(u32),
/// A table type.
Table(TableType),
/// A memory type.
Memory(MemoryType),
/// A global type.
Global(GlobalType),
/// A tag type.
///
/// This variant is used with the exception handling proposal.
Tag(TagType),
}
impl Encode for EntityType {
fn encode(&self, sink: &mut Vec<u8>) {
match self {
Self::Function(i) => {
sink.push(CORE_FUNCTION_SORT);
i.encode(sink);
}
Self::Table(t) => {
sink.push(CORE_TABLE_SORT);
t.encode(sink);
}
Self::Memory(t) => {
sink.push(CORE_MEMORY_SORT);
t.encode(sink);
}
Self::Global(t) => {
sink.push(CORE_GLOBAL_SORT);
t.encode(sink);
}
Self::Tag(t) => {
sink.push(CORE_TAG_SORT);
t.encode(sink);
}
}
}
}
impl From<TableType> for EntityType {
fn from(t: TableType) -> Self {
Self::Table(t)
}
}
impl From<MemoryType> for EntityType {
fn from(t: MemoryType) -> Self {
Self::Memory(t)
}
}
impl From<GlobalType> for EntityType {
fn from(t: GlobalType) -> Self {
Self::Global(t)
}
}
impl From<TagType> for EntityType {
fn from(t: TagType) -> Self {
Self::Tag(t)
}
}
/// An encoder for the import section of WebAssembly modules.
///
/// # Example
///
/// ```rust
/// use wasm_encoder::{MemoryType, Module, ImportSection};
///
/// let mut imports = ImportSection::new();
/// imports.import(
/// "env",
/// "memory",
/// MemoryType {
/// minimum: 1,
/// maximum: None,
/// memory64: false,
/// shared: false,
/// page_size_log2: None,
/// }
/// );
///
/// let mut module = Module::new();
/// module.section(&imports);
///
/// let bytes = module.finish();
/// ```
#[derive(Clone, Debug, Default)]
pub struct ImportSection {
bytes: Vec<u8>,
num_added: u32,
}
impl ImportSection {
/// Create a new import section encoder.
pub fn new() -> Self {
Self::default()
}
/// The number of imports in the section.
pub fn len(&self) -> u32 {
self.num_added
}
/// Determines if the section is empty.
pub fn is_empty(&self) -> bool {
self.num_added == 0
}
/// Define an import in the import section.
pub fn import(&mut self, module: &str, field: &str, ty: impl Into<EntityType>) -> &mut Self {
module.encode(&mut self.bytes);
field.encode(&mut self.bytes);
ty.into().encode(&mut self.bytes);
self.num_added += 1;
self
}
}
impl Encode for ImportSection {
fn encode(&self, sink: &mut Vec<u8>) {
encode_section(sink, self.num_added, &self.bytes);
}
}
impl Section for ImportSection {
fn id(&self) -> u8 {
SectionId::Import.into()
}
}