wasmer/tests/high_level_api.rs

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#![cfg(test)]
#[macro_use]
mod utils;
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static TEST_WAT: &str = r#"
(module
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(import "env" "outside-global" (global $outside-global (mut i32)))
(import "env" "update-func" (func $update-func (param i32) (result i32)))
(table $test-table (export "test-table") 2 anyfunc)
(global $test-global (export "test-global") (mut i32) (i32.const 3))
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(elem (;0;) (i32.const 0) $ret_2)
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(func $ret_2 (export "ret_2") (result i32)
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i32.const 2)
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(func $ret_4 (export "ret_4") (result i32)
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i32.const 4)
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(func $set_test_global (export "set_test_global") (param i32)
(global.set $test-global
(local.get 0)))
(func $update-outside-global (export "update_outside_global")
(global.set $outside-global
(call $update-func (global.get $outside-global))))
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)
"#;
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fn append_custom_section(
wasm: &mut Vec<u8>,
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custom_section_name: &str,
custom_section_contents: &[u8],
) {
wasm.reserve(
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// 1 for custom section id, 5 for max length of custom section, 5 for max length of name
custom_section_name.len() + custom_section_contents.len() + 1 + 5 + 5,
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);
wasm.push(0);
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let name_length = custom_section_name.as_bytes().len() as u32;
let mut name_length_as_leb128 = vec![];
write_u32_leb128(&mut name_length_as_leb128, name_length);
let custom_section_length = (custom_section_contents.len()
+ custom_section_name.as_bytes().len()
+ name_length_as_leb128.len()) as u32;
let mut custom_section_length_as_leb128 = vec![];
write_u32_leb128(&mut custom_section_length_as_leb128, custom_section_length);
wasm.extend(&custom_section_length_as_leb128);
wasm.extend(&name_length_as_leb128);
wasm.extend(custom_section_name.as_bytes());
wasm.extend(custom_section_contents);
}
wasmer_backends! {
use super::{TEST_WAT, append_custom_section};
#[test]
fn custom_section_parsing_works() {
use wasmer::{CompiledModule, Module};
let wasm = {
let mut wasm = wabt::wat2wasm(TEST_WAT).unwrap();
append_custom_section(&mut wasm, "test_custom_section", b"hello, world!");
append_custom_section(&mut wasm, "test_custom_section", b"goodbye, world!");
append_custom_section(&mut wasm, "different_name", b"different value");
wasm
};
let module = Module::new_with_compiler(wasm, get_compiler()).unwrap();
assert_eq!(
module.custom_sections("test_custom_section"),
Some(&[b"hello, world!".to_vec(), b"goodbye, world!".to_vec()][..])
);
}
#[test]
fn module_exports_are_ordered() {
use wasmer::types::{ElementType, FuncSig, GlobalDescriptor, TableDescriptor, Type};
use wasmer::{export, CompiledModule, Module};
let wasm = wabt::wat2wasm(TEST_WAT).unwrap();
// TODO: review error messages when `CompiledModule` is not in scope. My hypothesis is that they'll be
// misleading, if so we may want to do something about it.
let module = Module::new_with_compiler(wasm, get_compiler()).unwrap();
let exports = module.exports();
assert_eq!(
exports,
vec![
export::ExportDescriptor {
name: "test-table",
ty: export::ExternDescriptor::Table(TableDescriptor {
element: ElementType::Anyfunc,
minimum: 2,
maximum: None,
}),
},
export::ExportDescriptor {
name: "test-global",
ty: export::ExternDescriptor::Global(GlobalDescriptor {
mutable: true,
ty: Type::I32,
}),
},
export::ExportDescriptor {
name: "ret_2",
ty: export::ExternDescriptor::Function(FuncSig::new(vec![], vec![Type::I32])),
},
export::ExportDescriptor {
name: "ret_4",
ty: export::ExternDescriptor::Function(FuncSig::new(vec![], vec![Type::I32])),
},
export::ExportDescriptor {
name: "set_test_global",
ty: export::ExternDescriptor::Function(FuncSig::new(vec![Type::I32], vec![])),
},
export::ExportDescriptor {
name: "update_outside_global",
ty: export::ExternDescriptor::Function(FuncSig::new(vec![], vec![])),
},
]
);
}
#[test]
fn module_imports_are_correct() {
use wasmer::{CompiledModule, Module};
let wasm = wabt::wat2wasm(TEST_WAT).unwrap();
// TODO: review error messages when `CompiledModule` is not in scope. My hypothesis is that they'll be
// misleading, if so we may want to do something about it.
let module = Module::new_with_compiler(wasm, get_compiler()).unwrap();
// TODO: test this more later
let imports = module.imports();
assert_eq!(imports.len(), 2);
}
#[test]
fn module_can_be_instantiated() {
use wasmer::wasm::{Global, Value};
use wasmer::{func, imports, CompiledModule, Module};
let wasm = wabt::wat2wasm(TEST_WAT).unwrap();
// TODO: review error messages when `CompiledModule` is not in scope. My hypothesis is that they'll be
// misleading, if so we may want to do something about it.
let module = Module::new_with_compiler(wasm, get_compiler()).unwrap();
let outside_global = Global::new_mutable(Value::I32(15));
let import_object = imports! {
"env" => {
"update-func" => func!(|x: i32| x * 2),
"outside-global" => outside_global.clone(),
}
};
let instance = module.instantiate(&import_object);
assert!(instance.is_ok());
}
#[test]
fn exports_work() {
use wasmer::wasm::{Global, Value};
use wasmer::{func, imports, CompiledModule, Func, Module, Table};
let wasm = wabt::wat2wasm(TEST_WAT).unwrap();
// TODO: review error messages when `CompiledModule` is not in scope. My hypothesis is that they'll be
// misleading, if so we may want to do something about it.
let module = Module::new_with_compiler(wasm, get_compiler()).unwrap();
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let outside_global = Global::new_mutable(Value::I32(15));
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let import_object = imports! {
"env" => {
"update-func" => func!(|x: i32| x * 2),
"outside-global" => outside_global.clone(),
}
};
let instance = module.instantiate(&import_object).unwrap();
let ret_2: Func<(), i32> = instance.exports.get("ret_2").unwrap();
let ret_4: Func<(), i32> = instance.exports.get("ret_4").unwrap();
let set_test_global: Func<i32> = instance.exports.get("set_test_global").unwrap();
let update_outside_global: Func = instance.exports.get("update_outside_global").unwrap();
assert_eq!(ret_2.call(), Ok(2));
assert_eq!(ret_4.call(), Ok(4));
let _test_table: Table = instance.exports.get("test-table").unwrap();
// TODO: when table get is stablized test this
let test_global: Global = instance.exports.get("test-global").unwrap();
// TODO: do we want to make global.get act like exports.get()?
assert_eq!(test_global.get(), Value::I32(3));
set_test_global.call(17).unwrap();
assert_eq!(test_global.get(), Value::I32(17));
assert_eq!(outside_global.get(), Value::I32(15));
update_outside_global.call().unwrap();
assert_eq!(outside_global.get(), Value::I32(15 * 2));
update_outside_global.call().unwrap();
assert_eq!(outside_global.get(), Value::I32(15 * 2 * 2));
}
#[test]
fn allow_missing() {
use wabt::wat2wasm;
use wasmer::{imports, CompiledModule, Module};
static WAT: &'static str = r#"
(module
(type (;0;) (func))
(type (;1;) (func (result i32)))
(import "env" "ret_err" (func $ret_err (type 0)))
(func $get_num (type 1)
i32.const 42
)
(export "get_num" (func $get_num))
)
"#;
let wasm = wat2wasm(WAT).unwrap();
let module = Module::new_with_compiler(wasm, get_compiler()).unwrap();
let mut import_object = imports! {};
import_object.allow_missing_functions = true;
assert!(module.instantiate(&import_object).is_ok());
}
#[test]
fn error_propagation() {
use std::convert::Infallible;
use wabt::wat2wasm;
use wasmer::{func, imports, error::RuntimeError, vm::Ctx, CompiledModule, Func, Module};
static WAT: &'static str = r#"
(module
(type (;0;) (func))
(import "env" "ret_err" (func $ret_err (type 0)))
(func $call_panic
call $ret_err
)
(export "call_err" (func $call_panic))
)
"#;
#[derive(Debug)]
struct ExitCode {
code: i32,
}
fn ret_err(_ctx: &mut Ctx) -> Result<Infallible, ExitCode> {
Err(ExitCode { code: 42 })
}
let wasm = wat2wasm(WAT).unwrap();
let module = Module::new_with_compiler(wasm, get_compiler()).unwrap();
let instance = module
.instantiate(&imports! {
"env" => {
"ret_err" => Func::new(ret_err),
},
})
.unwrap();
let foo: Func<(), ()> = instance.exports.get("call_err").unwrap();
let result = foo.call();
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if let Err(RuntimeError::User(e)) = result {
let exit_code = e.downcast::<ExitCode>().unwrap();
assert_eq!(exit_code.code, 42);
} else {
panic!("didn't return RuntimeError")
}
}
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}
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// copied from Rust stdlib: https://doc.rust-lang.org/nightly/nightly-rustc/src/serialize/leb128.rs.html#4-14
macro_rules! impl_write_unsigned_leb128 {
($fn_name:ident, $int_ty:ident) => {
#[inline]
pub fn $fn_name(out: &mut Vec<u8>, mut value: $int_ty) {
loop {
if value < 0x80 {
out.push(value as u8);
break;
} else {
out.push(((value & 0x7f) | 0x80) as u8);
value >>= 7;
}
}
}
};
}
impl_write_unsigned_leb128!(write_u16_leb128, u16);
impl_write_unsigned_leb128!(write_u32_leb128, u32);
impl_write_unsigned_leb128!(write_u64_leb128, u64);
impl_write_unsigned_leb128!(write_u128_leb128, u128);
impl_write_unsigned_leb128!(write_usize_leb128, usize);