wasmer/tests/middleware_common.rs

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#![cfg(all(any(feature = "backend-singlepass", feature = "backend-llvm"), test))]
use wabt::wat2wasm;
use wasmer::compiler::{compile_with, Compiler};
use wasmer::imports;
use wasmer::wasm::Func;
use wasmer_middleware_common::metering::*;
use wasmer_runtime_core::codegen::ModuleCodeGenerator;
use wasmer_runtime_core::codegen::{MiddlewareChain, StreamingCompiler};
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use wasmer_runtime_core::error::RuntimeError;
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use wasmer_runtime_core::fault::{pop_code_version, push_code_version};
use wasmer_runtime_core::state::CodeVersion;
// Assemblyscript
// export function add_to(x: i32, y: i32): i32 {
// for(var i = 0; i < x; i++){
// if(i % 1 == 0){
// y += i;
// } else {
// y *= i
// }
// }
// return y;
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// }
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static WAT: &'static str = r#"
(module
(type $t0 (func (param i32 i32) (result i32)))
(type $t1 (func))
(func $add_to (export "add_to") (type $t0) (param $p0 i32) (param $p1 i32) (result i32)
(local $l0 i32)
block $B0
i32.const 0
set_local $l0
loop $L1
get_local $l0
get_local $p0
i32.lt_s
i32.eqz
br_if $B0
get_local $l0
i32.const 1
i32.rem_s
i32.const 0
i32.eq
if $I2
get_local $p1
get_local $l0
i32.add
set_local $p1
else
get_local $p1
get_local $l0
i32.mul
set_local $p1
end
get_local $l0
i32.const 1
i32.add
set_local $l0
br $L1
unreachable
end
unreachable
end
get_local $p1)
(func $f1 (type $t1))
(table $table (export "table") 1 anyfunc)
(memory $memory (export "memory") 0)
(global $g0 i32 (i32.const 8))
(elem (i32.const 0) $f1))
"#;
#[cfg(feature = "backend-singlepass")]
mod singlepass {
use super::{Compiler, Metering, MiddlewareChain, StreamingCompiler};
fn get_compiler() -> impl Compiler {
use wasmer_singlepass_backend::ModuleCodeGenerator as MCG;
let limit = 100u64;
let c: StreamingCompiler<MCG, _, _, _, _> = StreamingCompiler::new(move || {
let mut chain = MiddlewareChain::new();
chain.push(Metering::new(limit));
chain
});
c
}
#[test]
fn middleware_test_points_reduced_after_call() {
super::middleware_test_points_reduced_after_call("singlepass", get_compiler())
}
#[test]
fn middleware_test_traps_after_costly_call() {
super::middleware_test_traps_after_costly_call("singlepass", get_compiler())
}
}
#[cfg(feature = "backend-llvm")]
mod llvm {
use super::{Compiler, Metering, MiddlewareChain, StreamingCompiler};
fn get_compiler() -> impl Compiler {
use wasmer_llvm_backend::ModuleCodeGenerator as MCG;
let limit = 100u64;
let c: StreamingCompiler<MCG, _, _, _, _> = StreamingCompiler::new(move || {
let mut chain = MiddlewareChain::new();
chain.push(Metering::new(limit));
chain
});
c
}
#[test]
fn middleware_test_points_reduced_after_call() {
super::middleware_test_points_reduced_after_call("llvm", get_compiler())
}
#[test]
fn middleware_test_traps_after_costly_call() {
super::middleware_test_traps_after_costly_call("llvm", get_compiler())
}
}
fn middleware_test_points_reduced_after_call(backend: &'static str, compiler: impl Compiler) {
let wasm_binary = wat2wasm(WAT).unwrap();
let module = compile_with(&wasm_binary, &compiler).unwrap();
let import_object = imports! {};
let mut instance = module.instantiate(&import_object).unwrap();
set_points_used(&mut instance, 0u64);
let add_to: Func<(i32, i32), i32> = instance.exports.get("add_to").unwrap();
let cv_pushed = if let Some(msm) = instance.module.runnable_module.get_module_state_map() {
push_code_version(CodeVersion {
baseline: true,
msm: msm,
base: instance.module.runnable_module.get_code().unwrap().as_ptr() as usize,
backend: &backend,
runnable_module: instance.module.runnable_module.clone(),
});
true
} else {
false
};
let value = add_to.call(3, 4).unwrap();
if cv_pushed {
pop_code_version().unwrap();
}
// verify it returns the correct value
assert_eq!(value, 7);
// verify it used the correct number of points
assert_eq!(get_points_used(&instance), 74);
}
fn middleware_test_traps_after_costly_call(backend: &'static str, compiler: impl Compiler) {
let wasm_binary = wat2wasm(WAT).unwrap();
let module = compile_with(&wasm_binary, &compiler).unwrap();
let import_object = imports! {};
let mut instance = module.instantiate(&import_object).unwrap();
set_points_used(&mut instance, 0u64);
let add_to: Func<(i32, i32), i32> = instance.exports.get("add_to").unwrap();
let cv_pushed = if let Some(msm) = instance.module.runnable_module.get_module_state_map() {
push_code_version(CodeVersion {
baseline: true,
msm: msm,
base: instance.module.runnable_module.get_code().unwrap().as_ptr() as usize,
backend: &backend,
runnable_module: instance.module.runnable_module.clone(),
});
true
} else {
false
};
let result = add_to.call(10_000_000, 4);
if cv_pushed {
pop_code_version().unwrap();
}
let err = result.unwrap_err();
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if let RuntimeError::Metering(metering_err) = err {
assert!(metering_err
.downcast_ref::<ExecutionLimitExceededError>()
.is_some());
} else {
assert!(false, "metering error not found");
}
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// verify it used the correct number of points
assert_eq!(get_points_used(&instance), 109); // Used points will be slightly more than `limit` because of the way we do gas checking.
}