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Make FuncEnvironment independent from ModuleEnvironment (formerly WasmRuntime).

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This renames WasmRuntime to ModuleEnvironment, and makes several changes
to allow for more flexible compilation.

ModuleEnvironment no longer derives from FuncEnvironment, and no longer
has the `begin_translation` and `next_translation` functions, so that
independent `FuncEnvironment` instances can operate within the same
module.

Also, this obviates the rest of TranslationResult, as it moves processing
of function bodies into the environment. The DummyEnvironment implementation
gives an example of decoding the function bodies as they are parsed, however
other implementation strategies are now possible.
This commit is contained in:
Dan Gohman
2017-10-10 15:21:29 -07:00
parent d4c0c5babc
commit 733870aee4
9 changed files with 245 additions and 187 deletions
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14
lib/wasm/src/lib.rs
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@@ -1,12 +1,10 @@
//! Performs the translation from a wasm module in binary format to the in-memory representation
//! of the Cretonne IL. More particularly, it translates the code of all the functions bodies and
//! interacts with a runtime implementing the [`WasmRuntime`](trait.WasmRuntime.html) trait to
//! deal with tables, globals and linear memory.
//! interacts with a runtime implementing the [`ModuleEnvironment`](trait.ModuleEnvironment.html)
//! trait to deal with tables, globals and linear memory.
//!
//! The crate provides a `DummyRuntime` trait that will allow to translate the code of the
//! functions but will fail at execution. You should use
//! [`wasmstandalone::StandaloneRuntime`](../wasmstandalone/struct.StandaloneRuntime.html) to be
//! able to execute the translated code.
//! The crate provides a `DummyEnvironment` struct that will allow to translate the code of the
//! functions but will fail at execution.
//!
//! The main function of this module is [`translate_module`](fn.translate_module.html).
@@ -26,7 +24,7 @@ mod state;
mod translation_utils;
pub use func_translator::FuncTranslator;
pub use module_translator::{translate_module, TranslationResult};
pub use runtime::{FuncEnvironment, WasmRuntime, DummyRuntime, GlobalValue};
pub use module_translator::translate_module;
pub use runtime::{FuncEnvironment, ModuleEnvironment, DummyEnvironment, GlobalValue};
pub use translation_utils::{FunctionIndex, GlobalIndex, TableIndex, MemoryIndex, SignatureIndex,
Global, GlobalInit, Table, Memory};