Add a compile command to Wasmtime.

This commit adds a `compile` command to the Wasmtime CLI.

The command can be used to Ahead-Of-Time (AOT) compile WebAssembly modules.

With the `all-arch` feature enabled, AOT compilation can be performed for
non-native architectures (i.e. cross-compilation).

The `Module::compile` method has been added to perform AOT compilation.

A few of the CLI flags relating to "on by default" Wasm features have been
changed to be "--disable-XYZ" flags.

A simple example of using the `wasmtime compile` command:

```text
$ wasmtime compile input.wasm
$ wasmtime input.cwasm
```

cranelift/codegen/src/isa/aarch64/mod.rs

@@ -7,10 +7,8 @@ use crate::isa::Builder as IsaBuilder;
 use crate::machinst::{compile, MachBackend, MachCompileResult, TargetIsaAdapter, VCode};
 use crate::result::CodegenResult;
 use crate::settings as shared_settings;
-
-use alloc::boxed::Box;
+use alloc::{borrow::ToOwned, boxed::Box, string::String, vec::Vec};
 use core::hash::{Hash, Hasher};
-
 use regalloc::{PrettyPrint, RealRegUniverse};
 use target_lexicon::{Aarch64Architecture, Architecture, Triple};
 
@@ -104,6 +102,17 @@ impl MachBackend for AArch64Backend {
         &self.flags
     }
 
+    fn enabled_isa_flags(&self) -> Vec<String> {
+        self.isa_flags
+            .iter_enabled()
+            .map(ToOwned::to_owned)
+            .collect()
+    }
+
+    fn is_flag_enabled(&self, flag: &str) -> bool {
+        self.isa_flags.is_enabled(flag)
+    }
+
     fn hash_all_flags(&self, mut hasher: &mut dyn Hasher) {
         self.flags.hash(&mut hasher);
         self.isa_flags.hash(&mut hasher);

cranelift/codegen/src/isa/arm32/mod.rs

@@ -7,7 +7,7 @@ use crate::machinst::{compile, MachBackend, MachCompileResult, TargetIsaAdapter,
 use crate::result::CodegenResult;
 use crate::settings;
 
-use alloc::boxed::Box;
+use alloc::{boxed::Box, string::String, vec::Vec};
 use core::hash::{Hash, Hasher};
 use regalloc::{PrettyPrint, RealRegUniverse};
 use target_lexicon::{Architecture, ArmArchitecture, Triple};
@@ -92,6 +92,14 @@ impl MachBackend for Arm32Backend {
         &self.flags
     }
 
+    fn enabled_isa_flags(&self) -> Vec<String> {
+        Vec::new()
+    }
+
+    fn is_flag_enabled(&self, _flag: &str) -> bool {
+        false
+    }
+
     fn hash_all_flags(&self, mut hasher: &mut dyn Hasher) {
         self.flags.hash(&mut hasher);
     }

cranelift/codegen/src/isa/mod.rs

@@ -63,8 +63,7 @@ use crate::result::CodegenResult;
 use crate::settings;
 use crate::settings::SetResult;
 use crate::timing;
-use alloc::borrow::Cow;
-use alloc::boxed::Box;
+use alloc::{borrow::Cow, boxed::Box, string::String, vec::Vec};
 use core::any::Any;
 use core::fmt;
 use core::fmt::{Debug, Formatter};
@@ -265,8 +264,13 @@ pub trait TargetIsa: fmt::Display + Send + Sync {
     /// Get the ISA-independent flags that were used to make this trait object.
     fn flags(&self) -> &settings::Flags;
 
-    /// Hashes all flags, both ISA-independent and ISA-specific, into the
-    /// specified hasher.
+    /// Get the enabled ISA-dependent flags that were used to make this trait object.
+    fn enabled_isa_flags(&self) -> Vec<String>;
+
+    /// Determines if the given ISA-dependent flag is enabled.
+    fn is_flag_enabled(&self, flag: &str) -> bool;
+
+    /// Hashes all flags, both ISA-independent and ISA-dependent, into the specified hasher.
     fn hash_all_flags(&self, hasher: &mut dyn Hasher);
 
     /// Get the default calling convention of this target.

cranelift/codegen/src/isa/riscv/mod.rs

@@ -15,8 +15,12 @@ use crate::isa::enc_tables::{self as shared_enc_tables, lookup_enclist, Encoding
 use crate::isa::Builder as IsaBuilder;
 use crate::isa::{EncInfo, RegClass, RegInfo, TargetIsa};
 use crate::regalloc;
-use alloc::borrow::Cow;
-use alloc::boxed::Box;
+use alloc::{
+    borrow::{Cow, ToOwned},
+    boxed::Box,
+    string::String,
+    vec::Vec,
+};
 use core::any::Any;
 use core::fmt;
 use core::hash::{Hash, Hasher};
@@ -70,6 +74,17 @@ impl TargetIsa for Isa {
         &self.shared_flags
     }
 
+    fn enabled_isa_flags(&self) -> Vec<String> {
+        self.isa_flags
+            .iter_enabled()
+            .map(ToOwned::to_owned)
+            .collect()
+    }
+
+    fn is_flag_enabled(&self, flag: &str) -> bool {
+        self.isa_flags.is_enabled(flag)
+    }
+
     fn hash_all_flags(&self, mut hasher: &mut dyn Hasher) {
         self.shared_flags.hash(&mut hasher);
         self.isa_flags.hash(&mut hasher);

cranelift/codegen/src/isa/x64/mod.rs

@@ -9,7 +9,7 @@ use crate::isa::Builder as IsaBuilder;
 use crate::machinst::{compile, MachBackend, MachCompileResult, TargetIsaAdapter, VCode};
 use crate::result::CodegenResult;
 use crate::settings::{self as shared_settings, Flags};
-use alloc::boxed::Box;
+use alloc::{borrow::ToOwned, boxed::Box, string::String, vec::Vec};
 use core::hash::{Hash, Hasher};
 use regalloc::{PrettyPrint, RealRegUniverse, Reg};
 use target_lexicon::Triple;
@@ -85,6 +85,17 @@ impl MachBackend for X64Backend {
         &self.flags
     }
 
+    fn enabled_isa_flags(&self) -> Vec<String> {
+        self.x64_flags
+            .iter_enabled()
+            .map(ToOwned::to_owned)
+            .collect()
+    }
+
+    fn is_flag_enabled(&self, flag: &str) -> bool {
+        self.x64_flags.is_enabled(flag)
+    }
+
     fn hash_all_flags(&self, mut hasher: &mut dyn Hasher) {
         self.flags.hash(&mut hasher);
         self.x64_flags.hash(&mut hasher);

cranelift/codegen/src/isa/x86/mod.rs

@@ -21,8 +21,12 @@ use crate::isa::{EncInfo, RegClass, RegInfo, TargetIsa};
 use crate::regalloc;
 use crate::result::CodegenResult;
 use crate::timing;
-use alloc::borrow::Cow;
-use alloc::boxed::Box;
+use alloc::{
+    borrow::{Cow, ToOwned},
+    boxed::Box,
+    string::String,
+    vec::Vec,
+};
 use core::any::Any;
 use core::fmt;
 use core::hash::{Hash, Hasher};
@@ -79,6 +83,17 @@ impl TargetIsa for Isa {
         &self.shared_flags
     }
 
+    fn enabled_isa_flags(&self) -> Vec<String> {
+        self.isa_flags
+            .iter_enabled()
+            .map(ToOwned::to_owned)
+            .collect()
+    }
+
+    fn is_flag_enabled(&self, flag: &str) -> bool {
+        self.isa_flags.is_enabled(flag)
+    }
+
     fn hash_all_flags(&self, mut hasher: &mut dyn Hasher) {
         self.shared_flags.hash(&mut hasher);
         self.isa_flags.hash(&mut hasher);