More infrastructure.

Improve handling of memory.grow/size, add a standalone wast runner,
test harness improvements.

src/run_wast.rs

@@ -0,0 +1,103 @@
+//! CLI tool to run wast tests using the wasmtime libraries.
+
+#![deny(
+    missing_docs,
+    trivial_numeric_casts,
+    unused_extern_crates,
+    unstable_features
+)]
+#![warn(unused_import_braces)]
+#![cfg_attr(
+    feature = "clippy",
+    plugin(clippy(conf_file = "../../clippy.toml"))
+)]
+#![cfg_attr(
+    feature = "cargo-clippy",
+    allow(new_without_default, new_without_default_derive)
+)]
+#![cfg_attr(
+    feature = "cargo-clippy",
+    warn(
+        float_arithmetic,
+        mut_mut,
+        nonminimal_bool,
+        option_map_unwrap_or,
+        option_map_unwrap_or_else,
+        unicode_not_nfc,
+        use_self
+    )
+)]
+
+extern crate cranelift_codegen;
+extern crate cranelift_native;
+extern crate docopt;
+extern crate wasmtime_wast;
+#[macro_use]
+extern crate serde_derive;
+extern crate file_per_thread_logger;
+extern crate pretty_env_logger;
+
+use cranelift_codegen::settings;
+use cranelift_codegen::settings::Configurable;
+use docopt::Docopt;
+use std::path::Path;
+use wasmtime_wast::wast_file;
+
+static LOG_FILENAME_PREFIX: &str = "cranelift.dbg.";
+
+const USAGE: &str = "
+Wast test runner.
+
+Usage:
+    run_wast [-do] <file>...
+    run_wast --help | --version
+
+Options:
+    -h, --help          print this help message
+    --version           print the Cranelift version
+    -o, --optimize      runs optimization passes on the translated functions
+    -d, --debug         enable debug output on stderr/stdout
+";
+
+#[derive(Deserialize, Debug, Clone)]
+struct Args {
+    arg_file: Vec<String>,
+    flag_debug: bool,
+    flag_function: Option<String>,
+    flag_optimize: bool,
+}
+
+fn main() {
+    let args: Args = Docopt::new(USAGE)
+        .and_then(|d| {
+            d.help(true)
+                .version(Some(String::from("0.0.0")))
+                .deserialize()
+        }).unwrap_or_else(|e| e.exit());
+    let isa_builder = cranelift_native::builder().unwrap_or_else(|_| {
+        panic!("host machine is not a supported target");
+    });
+    let mut flag_builder = settings::builder();
+
+    // Enable verifier passes in debug mode.
+    if cfg!(debug_assertions) {
+        flag_builder.enable("enable_verifier").unwrap();
+    }
+
+    if args.flag_debug {
+        pretty_env_logger::init();
+    } else {
+        file_per_thread_logger::initialize(LOG_FILENAME_PREFIX);
+    }
+
+    // Enable optimization if requested.
+    if args.flag_optimize {
+        flag_builder.set("opt_level", "best").unwrap();
+    }
+
+    let isa = isa_builder.finish(settings::Flags::new(flag_builder));
+    for filename in &args.arg_file {
+        let path = Path::new(&filename);
+        wast_file(path, &*isa).expect(&format!("error reading file {}", path.display()));
+    }
+}