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Update no_std support for Rust 2018 Edition.

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With Rust 2018 Edition, the `mod std` trick to alias `core` names to
`std` no longer works, so switch to just having the code use `core`
explicitly.

So instead, switch to just using `core::*` for things that in core.
This is more consistent with other Rust no_std code. And it allows
us to enable `no_std` mode unconditionally in the crates that support
it, which makes testing a little easier.

There actually three cases:

 - For things in std and also in core, like `cmp`: Just use them via
   `core::*`.

 - For things in std and also in alloc, like `Vec`: Import alloc as std, as
   use them from std. This allows them to work on both stable (which
   doesn't provide alloc, but we don't support no_std mode anyway) and
   nightly.

 - For HashMap and similar which are not in core or alloc, import them in
   the top-level lib.rs files from either std or the third-party hashmap_core
   crate, and then have the code use super::hashmap_core.

Also, no_std support continues to be "best effort" at this time and not
something most people need to be testing.
This commit is contained in:
Dan Gohman
2019-01-07 11:04:58 -08:00
parent 50a045363c
commit aeb9161e2c
118 changed files with 322 additions and 355 deletions
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16
lib/simplejit/Cargo.toml
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@@ -5,19 +5,18 @@ authors = ["The Cranelift Project Developers"]
description = "A simple JIT library backed by Cranelift"
repository = "https://github.com/CraneStation/cranelift"
documentation = "https://cranelift.readthedocs.io/"
categories = ["no-std"]
license = "Apache-2.0 WITH LLVM-exception"
readme = "README.md"
edition = "2018"
[dependencies]
cranelift-codegen = { path = "../codegen", version = "0.26.0", default-features = false }
cranelift-module = { path = "../module", version = "0.26.0", default-features = false }
cranelift-native = { path = "../native", version = "0.26.0", default-features = false }
cranelift-codegen = { path = "../codegen", version = "0.26.0" }
cranelift-module = { path = "../module", version = "0.26.0" }
cranelift-native = { path = "../native", version = "0.26.0" }
region = "1.0.0"
libc = { version = "0.2.42", default-features = false }
libc = { version = "0.2.42" }
errno = "0.2.4"
target-lexicon = { version = "0.2.0", default-features = false }
target-lexicon = { version = "0.2.0" }
[target.'cfg(target_os = "windows")'.dependencies]
winapi = { version = "0.3", features = ["winbase", "memoryapi"] }
@@ -27,11 +26,6 @@ cranelift = { path = "../umbrella", version = "0.26.0" }
cranelift-frontend = { path = "../frontend", version = "0.26.0" }
cranelift-entity = { path = "../entity", version = "0.26.0" }
[features]
default = ["std"]
std = ["libc/use_std", "cranelift-codegen/std", "cranelift-module/std", "cranelift-native/std", "target-lexicon/std"]
core = ["cranelift-codegen/core", "cranelift-module/core", "cranelift-native/core"]
[badges]
maintenance = { status = "experimental" }
travis-ci = { repository = "CraneStation/cranelift" }