Switch from hashmap_core to hashbrown.

As suggested
[here](https://github.com/Amanieu/hashmap_core/pull/10#issuecomment-455866083).

This also allows us to re-enable the basic compile fuzz target.

fuzz/.gitignore

@@ -1,3 +0,0 @@
-target
-corpus
-artifacts

fuzz/fuzz_targets/compile.rs

@@ -10,7 +10,7 @@ extern crate wasmtime_jit;
 
 use cranelift_codegen::settings;
 use wasmparser::validate;
-use wasmtime_environ::{Module, ModuleEnvironment};
+use wasmtime_jit::{CompiledModule, Compiler, NullResolver};
 
 fuzz_target!(|data: &[u8]| {
     if !validate(data, None) {
@@ -21,14 +21,9 @@ fuzz_target!(|data: &[u8]| {
         panic!("host machine is not a supported target");
     });
     let isa = isa_builder.finish(settings::Flags::new(flag_builder));
-    let mut module = Module::new();
-    let environment = ModuleEnvironment::new(&*isa, &mut module);
-    let translation = match environment.translate(data) {
-        Ok(translation) => translation,
-        Err(_) => return,
-    };
-    let imports_resolver = |_env: &str, _function: &str| None;
-    let _exec = match wasmtime_jit::compile_and_link_module(&*isa, &translation, imports_resolver) {
+    let mut compiler = Compiler::new(isa);
+    let mut resolver = NullResolver {};
+    let _compiled = match CompiledModule::new(&mut compiler, data, &mut resolver) {
         Ok(x) => x,
         Err(_) => return,
     };

lib/environ/Cargo.toml

@@ -18,12 +18,12 @@ cranelift-wasm = "0.26.0"
 cast = { version = "0.2.2", default-features = false }
 failure = { version = "0.1.3", default-features = false }
 failure_derive = { version = "0.1.3", default-features = false }
-hashmap_core = { version = "0.1.9", optional = true }
+hashbrown = { version = "0.1.8", optional = true }
 
 [features]
 default = ["std"]
 std = ["cranelift-codegen/std", "cranelift-wasm/std"]
-core = ["hashmap_core", "cranelift-codegen/core", "cranelift-wasm/core"]
+core = ["hashbrown/nightly", "cranelift-codegen/core", "cranelift-wasm/core"]
 
 [badges]
 maintenance = { status = "experimental" }

lib/environ/src/lib.rs

@@ -35,7 +35,7 @@ extern crate alloc as std;
 extern crate std;
 
 #[cfg(not(feature = "std"))]
-use hashmap_core::HashMap;
+use hashbrown::HashMap;
 #[cfg(feature = "std")]
 use std::collections::HashMap;
 

lib/jit/Cargo.toml

@@ -22,12 +22,12 @@ region = "1.0.0"
 failure = { version = "0.1.3", default-features = false }
 failure_derive = { version = "0.1.3", default-features = false }
 target-lexicon = { version = "0.2.0", default-features = false }
-hashmap_core = { version = "0.1.9", optional = true }
+hashbrown = { version = "0.1.8", optional = true }
 
 [features]
 default = ["std"]
 std = ["cranelift-codegen/std", "cranelift-wasm/std"]
-core = ["hashmap_core", "cranelift-codegen/core", "cranelift-wasm/core", "wasmtime-environ/core"]
+core = ["hashbrown/nightly", "cranelift-codegen/core", "cranelift-wasm/core", "wasmtime-environ/core"]
 
 [badges]
 maintenance = { status = "experimental" }

lib/jit/src/lib.rs

@@ -32,7 +32,7 @@ extern crate alloc as std;
 extern crate std;
 
 #[cfg(not(feature = "std"))]
-use hashmap_core::{map as hash_map, HashMap};
+use hashbrown::{map as hash_map, HashMap};
 #[cfg(feature = "std")]
 use std::collections::{hash_map, HashMap};
 

lib/runtime/src/lib.rs

@@ -32,7 +32,7 @@ extern crate alloc as std;
 extern crate std;
 
 #[cfg(not(feature = "std"))]
-use hashmap_core::{map as hash_map, HashMap};
+use hashbrown::{map as hash_map, HashMap};
 #[cfg(feature = "std")]
 use std::collections::{hash_map, HashMap};
 

test-all.sh

@@ -62,13 +62,10 @@ if rustup toolchain list | grep -q nightly; then
         cargo +nightly install cargo-fuzz
     fi
 
-    echo "Fuzz check temporarily disabled until "
-    echo "https://github.com/Amanieu/hashmap_core/pull/8"
-    echo "is merged."
-    #fuzz_module="8f0d725b20dcea52335cf521a5bb083833a5241f"
-    #ASAN_OPTIONS=detect_leaks=0 \
-    #cargo +nightly fuzz run compile \
-    #    "$topdir/fuzz/corpus/compile/$fuzz_module"
+    fuzz_module="1340712d77d3db3c79b4b0c1494df18615485480"
+    ASAN_OPTIONS=detect_leaks=0 \
+    cargo +nightly fuzz run compile \
+        "$topdir/fuzz/corpus/compile/$fuzz_module"
 else
     echo "nightly toolchain not found, skipping fuzz target integration test"
 fi