* Simple module compilation cache
* Fix base64 encoding bug
* Use warn! everywhere in cache system
* Remove unused import
* Temporary workaround for long path on Windows
* Remove unused import for non-windows builds
* Add command line argument to enable cache system + apply minor review feedback
Even though this somehow passed on Travis on [the
PR](https://github.com/CraneStation/wasmtime/pull/209), it fails on
Travis on master, and I can reproduce the failure.
The failure is on spec_testsuite/names.wast:
```
$ RUST_BACKTRACE=1 target/debug/wast spec_testsuite/names.wast
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: FromUtf8Error { bytes: [255], error: Utf8Error { valid_up_to: 0, error_len: Some(1) } }', src/libcore/result.rs:999:5
stack backtrace:
[...]
9: core::result::Result<T,E>::unwrap
at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c/src/libcore/result.rs:800
10: wabt::script::jstring_to_rstring
at [...]/.cargo/registry/src/github.com-1ecc6299db9ec823/wabt-0.8.0/src/script/mod.rs:261
11: wabt::script::parse_action
at [...]/.cargo/registry/src/github.com-1ecc6299db9ec823/wabt-0.8.0/src/script/mod.rs:274
12: wabt::script::ScriptParser<F32,F64>::next
at [...]/.cargo/registry/src/github.com-1ecc6299db9ec823/wabt-0.8.0/src/script/mod.rs:504
13: wasmtime_wast::wast::WastContext::run_buffer
at wasmtime-wast/src/wast.rs:202
14: wasmtime_wast::wast::WastContext::run_file
at wasmtime-wast/src/wast.rs:472
15: wast::main
at src/wast.rs:107
[...]
```
This adds the C WASI implementation as a new crate, wasmtime-wasi-c,
and adds a command-line flag to the wasmtime command-line driver to
select which WASI implementation to use.
* Transform DWARF sections into native format for wasm2obj and wasmtime.
Generate DWARF sections based on WASM DWARF.
Ignore some of debug_info/debug_line for dead code.
* Fix test
wasmtime-execute is now wasmtime-jit. Move `JITCode` and the TargetIsa
into a new `Compiler` type. `InstancePlus` is no more, with trampoline
functionality now handled by `Compiler`.
And lots of other miscellaneous changes. Rename InstanceWorld to
InstancePlus and reorganize its contents. This still isn't a great name,
but at least now it has a clear purpose.
The memmap crate doesn't make it straightforward to have part of the
region be writeable and part readonly. Since this is a fairly boutique
use case, and we don't need all that much code, just use the low-level
APIs directly.
Also, introduce a concept of "tunables" for adjusting the parameters of
the runtime.
The biggest change is the split from FunctionIndex to
DefinedFuncIndex to FuncIndex. Take better advantage of this by
converting several Vecs to PrimaryMaps.
Also, table_addr can now handle indices of the table index type,
so we don't need to explicitly uextend them anymore.
