Exceptions: add exception-specific (command-sequence) fuzzer. (#12923)

* Exceptions: add exception-specific (command-sequence) fuzzer.

This fuzzer uses a description of a set of "scenarios", arbitrarily
generated, to produce a specific kind of module that tests throw/catch
behavior. The module contains a chain of functions that invoke each
other; one will throw, and the rest may have catch clauses that do or
do not catch.

* Review feedback.

Author: cfallin

Cargo.lock

@@ -370,7 +370,7 @@ wasip2 = "1.0"
 arbitrary = "1.4.2"
 backtrace = "0.3.75"
 bumpalo = "3.20.0"
-mutatis = {version = "0.3.2", features = ["alloc"] }
+mutatis = {version = "0.3.2", features = ["alloc", "derive", "check"] }
 cc = "1.2.41"
 object = { version = "0.39.0", default-features = false, features = ['read_core', 'elf'] }
 gimli = { version = "0.33.0", default-features = false, features = ['read'] }

Cargo.toml

@@ -13,6 +13,7 @@ mod async_config;
 mod codegen_settings;
 pub mod component_async;
 mod config;
+pub mod exception_ops;
 pub mod gc_ops;
 mod instance_allocation_strategy;
 mod memory;
@@ -27,6 +28,7 @@ pub use async_config::AsyncConfig;
 pub use codegen_settings::CodegenSettings;
 pub use config::CompilerStrategy;
 pub use config::{Config, WasmtimeConfig};
+pub use exception_ops::ExceptionOps;
 pub use gc_ops::{limits::GcOpsLimits, ops::GcOps};
 pub use instance_allocation_strategy::InstanceAllocationStrategy;
 pub use memory::{HeapImage, MemoryAccesses, MemoryConfig};