parity_wasm/builder/
global.rs

1use super::{
2	invoke::{Identity, Invoke},
3	misc::ValueTypeBuilder,
4};
5
6use crate::elements;
7
8/// Global builder
9pub struct GlobalBuilder<F = Identity> {
10	callback: F,
11	value_type: elements::ValueType,
12	is_mutable: bool,
13	init_expr: elements::InitExpr,
14}
15
16impl GlobalBuilder {
17	/// New global builder
18	pub fn new() -> Self {
19		GlobalBuilder::with_callback(Identity)
20	}
21}
22
23impl Default for GlobalBuilder {
24	fn default() -> Self {
25		Self::new()
26	}
27}
28
29impl<F> GlobalBuilder<F> {
30	/// New global builder with callback (in chained context)
31	pub fn with_callback(callback: F) -> Self {
32		GlobalBuilder {
33			callback,
34			value_type: elements::ValueType::I32,
35			init_expr: elements::InitExpr::empty(),
36			is_mutable: false,
37		}
38	}
39
40	/// Set/override resulting global type
41	pub fn with_type(mut self, value_type: elements::ValueType) -> Self {
42		self.value_type = value_type;
43		self
44	}
45
46	/// Set mutabilty to true
47	pub fn mutable(mut self) -> Self {
48		self.is_mutable = true;
49		self
50	}
51
52	/// Set initialization expression instruction for this global (`end` instruction will be added automatically)
53	pub fn init_expr(mut self, instruction: elements::Instruction) -> Self {
54		self.init_expr = elements::InitExpr::new(vec![instruction, elements::Instruction::End]);
55		self
56	}
57
58	/// Start value type builder
59	pub fn value_type(self) -> ValueTypeBuilder<Self> {
60		ValueTypeBuilder::with_callback(self)
61	}
62}
63
64impl<F> GlobalBuilder<F>
65where
66	F: Invoke<elements::GlobalEntry>,
67{
68	/// Finalize current builder spawning resulting struct
69	pub fn build(self) -> F::Result {
70		self.callback.invoke(elements::GlobalEntry::new(
71			elements::GlobalType::new(self.value_type, self.is_mutable),
72			self.init_expr,
73		))
74	}
75}
76
77impl<F> Invoke<elements::ValueType> for GlobalBuilder<F> {
78	type Result = Self;
79	fn invoke(self, the_type: elements::ValueType) -> Self {
80		self.with_type(the_type)
81	}
82}
83
84/// New builder for export entry
85pub fn global() -> GlobalBuilder {
86	GlobalBuilder::new()
87}
88
89#[cfg(test)]
90mod tests {
91	use super::global;
92	use crate::elements;
93
94	#[test]
95	fn example() {
96		let entry = global().value_type().i32().build();
97		assert_eq!(entry.global_type().content_type(), elements::ValueType::I32);
98		assert!(!entry.global_type().is_mutable());
99	}
100}
parity_wasm/builder/global.rs

parity_wasm/builder/
global.rs
