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use serde::{Deserialize, Serialize};
/// A WebAssembly global along with its export specification.
///
/// The lifetime parameter exists to support zero-copy deserialization for the `&str` fields at the
/// leaves of the structure. For a variant with owned types at the leaves, see
/// [`OwnedGlobalSpec`](owned/struct.OwnedGlobalSpec.html).
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct GlobalSpec<'a> {
#[serde(borrow)]
global: Global<'a>,
export_names: Vec<&'a str>,
}
impl<'a> GlobalSpec<'a> {
pub fn new(global: Global<'a>, export_names: Vec<&'a str>) -> Self {
Self {
global,
export_names,
}
}
/// Create a new global definition with an initial value and export names.
pub fn new_def(init_val: i64, export_names: Vec<&'a str>) -> Self {
Self::new(Global::Def(GlobalDef::I64(init_val)), export_names)
}
/// Create a new global import definition with a module and field name, and export names.
pub fn new_import(module: &'a str, field: &'a str, export_names: Vec<&'a str>) -> Self {
Self::new(Global::Import { module, field }, export_names)
}
pub fn global(&self) -> &Global<'_> {
&self.global
}
pub fn export_names(&self) -> &[&str] {
&self.export_names
}
pub fn is_internal(&self) -> bool {
self.export_names.len() == 0
}
}
/// A WebAssembly global is either defined locally, or is defined in relation to a field of another
/// WebAssembly module.
///
/// The lifetime parameter exists to support zero-copy deserialization for the `&str` fields at the
/// leaves of the structure. For a variant with owned types at the leaves, see
/// [`OwnedGlobal`](owned/struct.OwnedGlobal.html).
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum Global<'a> {
Def(GlobalDef),
Import { module: &'a str, field: &'a str },
}
/// Definition for a global in this module (not imported).
#[derive(Debug, Copy, Clone, PartialEq, Serialize, Deserialize)]
pub enum GlobalDef {
I32(i32),
I64(i64),
F32(f32),
F64(f64),
}
impl GlobalDef {
pub fn init_val(&self) -> GlobalValue {
match self {
GlobalDef::I32(i) => GlobalValue { i_32: *i },
GlobalDef::I64(i) => GlobalValue { i_64: *i },
GlobalDef::F32(f) => GlobalValue { f_32: *f },
GlobalDef::F64(f) => GlobalValue { f_64: *f },
}
}
}
#[derive(Copy, Clone)]
pub union GlobalValue {
pub i_32: i32,
pub i_64: i64,
pub f_32: f32,
pub f_64: f64,
}
impl std::fmt::Debug for GlobalValue {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
// Because GlobalValue is a union of primitives, there won't be anything wrong,
// representation-wise, with printing the underlying data as an i64, f64, or
// another primitive. This still may incur UB by doing something like trying to
// read data from an uninitialized memory, if the union is initialized with a
// 32-bit value, and then read as a 64-bit value (as this code is about to do).
//
// In short, avoid using `<GlobalValue as Debug>`::fmt, please.
writeln!(f, "GlobalValue {{")?;
unsafe {
writeln!(f, " i_32: {},", self.i_32)?;
writeln!(f, " i_64: {},", self.i_64)?;
writeln!(f, " f_32: {},", self.f_32)?;
writeln!(f, " f_64: {},", self.f_64)?;
}
writeln!(f, "}}")
}
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////
/// A variant of [`GlobalSpec`](../struct.GlobalSpec.html) with owned strings throughout.
///
/// This type is useful when directly building up a value to be serialized.
pub struct OwnedGlobalSpec {
global: OwnedGlobal,
export_names: Vec<String>,
}
impl OwnedGlobalSpec {
pub fn new(global: OwnedGlobal, export_names: Vec<String>) -> Self {
Self {
global,
export_names,
}
}
/// Create a new global definition with an initial value and export names.
pub fn new_def(init_val: i64, export_names: Vec<String>) -> Self {
Self::new(OwnedGlobal::Def(GlobalDef::I64(init_val)), export_names)
}
/// Create a new global import definition with a module and field name, and export names.
pub fn new_import(module: String, field: String, export_names: Vec<String>) -> Self {
Self::new(OwnedGlobal::Import { module, field }, export_names)
}
/// Create a [`GlobalSpec`](../struct.GlobalSpec.html) backed by the values in this
/// `OwnedGlobalSpec`.
pub fn to_ref<'a>(&'a self) -> GlobalSpec<'a> {
GlobalSpec::new(
self.global.to_ref(),
self.export_names.iter().map(|x| x.as_str()).collect(),
)
}
}
/// A variant of [`Global`](../struct.Global.html) with owned strings throughout.
///
/// This type is useful when directly building up a value to be serialized.
pub enum OwnedGlobal {
Def(GlobalDef),
Import { module: String, field: String },
}
impl OwnedGlobal {
/// Create a [`Global`](../struct.Global.html) backed by the values in this `OwnedGlobal`.
pub fn to_ref<'a>(&'a self) -> Global<'a> {
match self {
OwnedGlobal::Def(def) => Global::Def(def.clone()),
OwnedGlobal::Import { module, field } => Global::Import {
module: module.as_str(),
field: field.as_str(),
},
}
}
}
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