Add no_std support in module, simplejit, and umbrella.

README.rst

@@ -35,9 +35,9 @@ the System V AMD64 ABI calling convention used on many platforms, but does not
 yet support the Windows x64 calling convention. The performance of code
 produced by Cretonne is not yet impressive, though we have plans to fix that.
 
-The core codegen crates have minimal dependencies, and do not require any host
-floating-point support. Support for `no_std` mode in the core codegen crates is
-`in development <https://github.com/cretonne/cretonne/tree/no_std>`_.
+The core codegen crates have minimal dependencies, support
+`no_std <#building-with-no-std>` mode, and do not require any host
+floating-point support.
 
 Cretonne does not yet perform mitigations for Spectre or related security
 issues, though it may do so in the future. It does not currently make any
@@ -93,22 +93,31 @@ installed.
 Building with `no_std`
 ----------------------
 
-To build cretonne without libstd, disable the `std` feature on `lib/cretonne`,
-`lib/frontend`, `lib/native`, and `lib/wasm`, which is otherwise enabled by
-default, and enable the `core` feature.
+The following crates support `no_std`:
+ - `cretonne-entity`
+ - `cretonne-codegen`
+ - `cretonne-frontend`
+ - `cretonne-native`
+ - `cretonne-wasm`
+ - `cretonne-module`
+ - `cretonne-simplejit`
+ - `cretonne`
 
-For example, to build `cretonne`:
+To use `no_std` mode, disable the `std` feature and enable the `core` feature.
+This currently requires nightly rust.
+
+For example, to build `cretonne-codegen`:
 
 .. code-block:: sh
 
-    cd lib/cretonne
+    cd lib/codegen
     cargo build --no-default-features --features core
 
-Or, when using `cretonne` as a dependency (in Cargo.toml):
+Or, when using `cretonne-codegen` as a dependency (in Cargo.toml):
 
 .. code-block::
 
-    [dependency.cretonne]
+    [dependency.cretonne-codegen]
     ...
     default-features = false
     features = ["core"]

cranelift/test-no_std.sh

@@ -15,14 +15,19 @@ function banner() {
 }
 
 # Test those packages which have no_std support.
-LIBS="codegen frontend wasm native"
+LIBS="codegen frontend wasm native module simplejit umbrella"
 cd "$topdir"
 for LIB in $LIBS
 do
     banner "Rust unit tests in $LIB"
     cd "lib/$LIB"
+
+    # Test with just "core" enabled.
     cargo test --no-default-features --features core
+
+    # Test with "core" and "std" enabled at the same time.
     cargo test --features core
+
     cd "$topdir"
 done
 

lib/codegen/Cargo.toml

@@ -12,12 +12,12 @@ build = "build.rs"
 
 [dependencies]
 cretonne-entity = { path = "../entity", version = "0.5.1", default-features = false }
+failure = { version = "0.1.1", default-features = false, features = ["derive"] }
+failure_derive = { version = "0.1.1", default-features = false }
 # It is a goal of the cretonne-codegen crate to have minimal external dependencies.
 # Please don't add any unless they are essential to the task of creating binary
 # machine code. Integration tests that need external dependencies can be
 # accomodated in `tests`.
-failure = { version = "0.1.1", default-features = false, features = ["derive"] }
-failure_derive = { version = "0.1.1", default-features = false }
 
 [dependencies.hashmap_core]
 version = "0.1.1"
@@ -28,7 +28,7 @@ optional = true
 # of some minimal std-like replacement libraries. At least one of these two
 # features to be enabled.
 default = ["std"]
-std = []
+std = ["cretonne-entity/std"]
 core = ["hashmap_core"]
 
 [badges]

lib/codegen/src/context.rs

@@ -23,6 +23,7 @@ use preopt::do_preopt;
 use regalloc;
 use result::{CtonError, CtonResult};
 use settings::{FlagsOrIsa, OptLevel};
+use std::vec::Vec;
 use simple_gvn::do_simple_gvn;
 use timing;
 use unreachable_code::eliminate_unreachable_code;

lib/module/Cargo.toml

@@ -9,8 +9,17 @@ license = "Apache-2.0"
 readme = "README.md"
 
 [dependencies]
-cretonne-codegen = { path = "../codegen", version = "0.5.1" }
-cretonne-entity = { path = "../entity", version = "0.5.1" }
+cretonne-codegen = { path = "../codegen", version = "0.5.1", default-features = false }
+cretonne-entity = { path = "../entity", version = "0.5.1", default-features = false }
+
+[dependencies.hashmap_core]
+version = "0.1.1"
+optional = true
+
+[features]
+default = ["std"]
+std = ["cretonne-codegen/std", "cretonne-entity/std"]
+core = ["hashmap_core", "cretonne-codegen/core"]
 
 [badges]
 maintenance = { status = "experimental" }

lib/simplejit/Cargo.toml

@@ -9,13 +9,18 @@ license = "Apache-2.0"
 readme = "README.md"
 
 [dependencies]
-cretonne-codegen = { path = "../codegen", version = "0.5.1" }
-cretonne-module = { path = "../module", version = "0.5.1" }
-cretonne-native = { path = "../native", version = "0.5.1" }
+cretonne-codegen = { path = "../codegen", version = "0.5.1", default-features = false }
+cretonne-module = { path = "../module", version = "0.5.1", default-features = false }
+cretonne-native = { path = "../native", version = "0.5.1", default-features = false }
 region = "0.2.0"
-libc = "0.2.40"
+libc = { version = "0.2.40", default-features = false }
 errno = "0.2.3"
 
+[features]
+default = ["std"]
+std = ["libc/use_std", "cretonne-codegen/std", "cretonne-module/std", "cretonne-native/std"]
+core = ["cretonne-codegen/core", "cretonne-module/core", "cretonne-native/core"]
+
 [badges]
 maintenance = { status = "experimental" }
 travis-ci = { repository = "Cretonne/cretonne" }

lib/umbrella/Cargo.toml

@@ -10,8 +10,13 @@ readme = "README.md"
 keywords = ["compile", "compiler", "jit"]
 
 [dependencies]
-cretonne-codegen = { path = "../codegen", version = "0.5.1" }
-cretonne-frontend = { path = "../frontend", version = "0.5.1" }
+cretonne-codegen = { path = "../codegen", version = "0.5.1", default-features = false }
+cretonne-frontend = { path = "../frontend", version = "0.5.1", default-features = false }
+
+[features]
+default = ["std"]
+std = ["cretonne-codegen/std", "cretonne-frontend/std"]
+core = ["cretonne-codegen/core", "cretonne-frontend/core"]
 
 [badges]
 maintenance = { status = "experimental" }