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120 lines
4.9 KiB
120 lines
4.9 KiB
//! An example of how to interact with multiple memories.
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//!
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//! Here a small wasm module with multiple memories is used to show how memory
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//! is initialized, how to read and write memory through the `Memory` object,
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//! and how wasm functions can trap when dealing with out-of-bounds addresses.
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// You can execute this example with `cargo run --example example`
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use wasmtime::*;
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fn main() -> Result<()> {
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// Enable the multi-memory feature.
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let mut config = Config::new();
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config.wasm_multi_memory(true);
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let engine = Engine::new(&config)?;
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// Create our `store_fn` context and then compile a module and create an
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// instance from the compiled module all in one go.
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let mut store = Store::new(&engine, ());
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let module = Module::from_file(store.engine(), "examples/multimemory.wat")?;
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let instance = Instance::new(&mut store, &module, &[])?;
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let memory0 = instance
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.get_memory(&mut store, "memory0")
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.ok_or(anyhow::format_err!("failed to find `memory0` export"))?;
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let size0 = instance.get_typed_func::<(), i32>(&mut store, "size0")?;
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let load0 = instance.get_typed_func::<i32, i32>(&mut store, "load0")?;
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let store0 = instance.get_typed_func::<(i32, i32), ()>(&mut store, "store0")?;
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let memory1 = instance
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.get_memory(&mut store, "memory1")
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.ok_or(anyhow::format_err!("failed to find `memory1` export"))?;
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let size1 = instance.get_typed_func::<(), i32>(&mut store, "size1")?;
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let load1 = instance.get_typed_func::<i32, i32>(&mut store, "load1")?;
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let store1 = instance.get_typed_func::<(i32, i32), ()>(&mut store, "store1")?;
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println!("Checking memory...");
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assert_eq!(memory0.size(&store), 2);
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assert_eq!(memory0.data_size(&store), 0x20000);
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assert_eq!(memory0.data_mut(&mut store)[0], 0);
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assert_eq!(memory0.data_mut(&mut store)[0x1000], 1);
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assert_eq!(memory0.data_mut(&mut store)[0x1001], 2);
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assert_eq!(memory0.data_mut(&mut store)[0x1002], 3);
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assert_eq!(memory0.data_mut(&mut store)[0x1003], 4);
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assert_eq!(size0.call(&mut store, ())?, 2);
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assert_eq!(load0.call(&mut store, 0)?, 0);
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assert_eq!(load0.call(&mut store, 0x1000)?, 1);
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assert_eq!(load0.call(&mut store, 0x1001)?, 2);
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assert_eq!(load0.call(&mut store, 0x1002)?, 3);
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assert_eq!(load0.call(&mut store, 0x1003)?, 4);
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assert_eq!(load0.call(&mut store, 0x1ffff)?, 0);
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assert!(load0.call(&mut store, 0x20000).is_err()); // out of bounds trap
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assert_eq!(memory1.size(&store), 2);
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assert_eq!(memory1.data_size(&store), 0x20000);
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assert_eq!(memory1.data_mut(&mut store)[0], 0);
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assert_eq!(memory1.data_mut(&mut store)[0x1000], 4);
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assert_eq!(memory1.data_mut(&mut store)[0x1001], 3);
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assert_eq!(memory1.data_mut(&mut store)[0x1002], 2);
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assert_eq!(memory1.data_mut(&mut store)[0x1003], 1);
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assert_eq!(size1.call(&mut store, ())?, 2);
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assert_eq!(load1.call(&mut store, 0)?, 0);
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assert_eq!(load1.call(&mut store, 0x1000)?, 4);
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assert_eq!(load1.call(&mut store, 0x1001)?, 3);
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assert_eq!(load1.call(&mut store, 0x1002)?, 2);
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assert_eq!(load1.call(&mut store, 0x1003)?, 1);
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assert_eq!(load1.call(&mut store, 0x1ffff)?, 0);
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assert!(load0.call(&mut store, 0x20000).is_err()); // out of bounds trap
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println!("Mutating memory...");
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memory0.data_mut(&mut store)[0x1003] = 5;
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store0.call(&mut store, (0x1002, 6))?;
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assert!(store0.call(&mut store, (0x20000, 0)).is_err()); // out of bounds trap
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assert_eq!(memory0.data(&store)[0x1002], 6);
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assert_eq!(memory0.data(&store)[0x1003], 5);
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assert_eq!(load0.call(&mut store, 0x1002)?, 6);
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assert_eq!(load0.call(&mut store, 0x1003)?, 5);
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memory1.data_mut(&mut store)[0x1003] = 7;
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store1.call(&mut store, (0x1002, 8))?;
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assert!(store1.call(&mut store, (0x20000, 0)).is_err()); // out of bounds trap
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assert_eq!(memory1.data(&store)[0x1002], 8);
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assert_eq!(memory1.data(&store)[0x1003], 7);
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assert_eq!(load1.call(&mut store, 0x1002)?, 8);
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assert_eq!(load1.call(&mut store, 0x1003)?, 7);
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println!("Growing memory...");
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memory0.grow(&mut store, 1)?;
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assert_eq!(memory0.size(&store), 3);
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assert_eq!(memory0.data_size(&store), 0x30000);
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assert_eq!(load0.call(&mut store, 0x20000)?, 0);
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store0.call(&mut store, (0x20000, 0))?;
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assert!(load0.call(&mut store, 0x30000).is_err());
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assert!(store0.call(&mut store, (0x30000, 0)).is_err());
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assert!(memory0.grow(&mut store, 1).is_err());
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assert!(memory0.grow(&mut store, 0).is_ok());
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memory1.grow(&mut store, 2)?;
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assert_eq!(memory1.size(&store), 4);
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assert_eq!(memory1.data_size(&store), 0x40000);
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assert_eq!(load1.call(&mut store, 0x30000)?, 0);
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store1.call(&mut store, (0x30000, 0))?;
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assert!(load1.call(&mut store, 0x40000).is_err());
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assert!(store1.call(&mut store, (0x40000, 0)).is_err());
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assert!(memory1.grow(&mut store, 1).is_err());
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assert!(memory1.grow(&mut store, 0).is_ok());
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Ok(())
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}
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