lib/wasm works with no_std

lib/wasm/src/code_translator.rs

@@ -34,6 +34,9 @@ use std::collections::{HashMap, hash_map};
 use environ::{FuncEnvironment, GlobalValue};
 use std::{i32, u32};
 
+// this is for no_std builds, but has no affect on regular builds
+use std::vec::Vec;
+
 /// Translates wasm operators into Cretonne IL instructions. Returns `true` if it inserted
 /// a return.
 pub fn translate_operator<FE: FuncEnvironment + ?Sized>(

lib/wasm/src/environ/dummy.rs

@@ -11,6 +11,10 @@ use cretonne::settings;
 use wasmparser;
 use std::error::Error;
 
+// this is for no_std builds, but has no affect on regular builds
+use std::vec::Vec;
+use std::string::String;
+
 /// Compute a `ir::ExternalName` for a given wasm function index.
 fn get_func_name(func_index: FunctionIndex) -> ir::ExternalName {
     ir::ExternalName::user(0, func_index as u32)

lib/wasm/src/environ/spec.rs

@@ -6,6 +6,10 @@ use cretonne::settings::Flags;
 use translation_utils::{SignatureIndex, FunctionIndex, TableIndex, GlobalIndex, MemoryIndex,
                         Global, Table, Memory};
 
+// this is for no_std builds, but has no affect on regular builds
+use std::vec::Vec;
+use std::string::String;
+
 /// The value of a WebAssembly global variable.
 #[derive(Clone, Copy)]
 pub enum GlobalValue {

lib/wasm/src/lib.rs

@@ -9,8 +9,20 @@
 //!
 //! The main function of this module is [`translate_module`](fn.translate_module.html).
 
+#![cfg_attr(feature = "no_std", no_std)]
 #![deny(missing_docs)]
 
+#![cfg_attr(feature = "no_std", feature(alloc))]
+
+#[cfg(feature = "no_std")]
+#[macro_use]
+extern crate alloc;
+
+#[cfg(feature = "no_std")]
+extern crate hashmap_core;
+#[cfg(feature = "no_std")]
+extern crate error_core;
+
 extern crate wasmparser;
 extern crate cton_frontend;
 #[macro_use(dbg)]
@@ -29,3 +41,16 @@ pub use module_translator::translate_module;
 pub use environ::{FuncEnvironment, ModuleEnvironment, DummyEnvironment, GlobalValue};
 pub use translation_utils::{FunctionIndex, GlobalIndex, TableIndex, MemoryIndex, SignatureIndex,
                             Global, GlobalInit, Table, Memory};
+
+#[cfg(feature = "no_std")]
+mod std {
+    pub use alloc::vec;
+    pub use alloc::string;
+    pub use core::{u32, i32, str, cmp};
+    pub mod collections {
+        pub use hashmap_core::{HashMap, map as hash_map};
+    }
+    pub mod error {
+        pub use error_core::Error;
+    }
+}

lib/wasm/src/module_translator.rs

@@ -8,6 +8,9 @@ use sections_translator::{SectionParsingError, parse_function_signatures, parse_
                           parse_elements_section, parse_data_section};
 use environ::ModuleEnvironment;
 
+// this is for no_std builds, but has no affect on regular builds
+use std::string::String;
+
 /// Translate a sequence of bytes forming a valid Wasm binary into a list of valid Cretonne IL
 /// [`Function`](../cretonne/ir/function/struct.Function.html).
 /// Returns the functions and also the mappings for imported functions and signature between the

lib/wasm/src/sections_translator.rs

@@ -17,6 +17,10 @@ use wasmparser;
 use std::str::from_utf8;
 use environ::ModuleEnvironment;
 
+// this is for no_std builds, but has no affect on regular builds
+use std::vec::Vec;
+use std::string::String;
+
 pub enum SectionParsingError {
     WrongSectionContent(String),
 }

lib/wasm/src/state.rs

@@ -8,6 +8,9 @@ use environ::{FuncEnvironment, GlobalValue};
 use std::collections::HashMap;
 use translation_utils::{GlobalIndex, MemoryIndex, SignatureIndex, FunctionIndex};
 
+// this is for no_std builds, but has no affect on regular builds
+use std::vec::Vec;
+
 /// A control stack frame can be an `if`, a `block` or a `loop`, each one having the following
 /// fields:
 ///