Add a compile command to Wasmtime.

Cargo.toml

@@ -38,12 +38,13 @@ anyhow = "1.0.19"
 target-lexicon = { version = "0.12.0", default-features = false }
 pretty_env_logger = "0.4.0"
 file-per-thread-logger = "0.1.1"
-wat = "1.0.36"
+wat = "1.0.37"
 libc = "0.2.60"
 log = "0.4.8"
 rayon = "1.2.1"
 humantime = "2.0.0"
 wasmparser = "0.77.0"
+lazy_static = "1.4.0"
 
 [dev-dependencies]
 env_logger = "0.8.1"
@@ -90,6 +91,7 @@ vtune = ["wasmtime/vtune"]
 wasi-crypto = ["wasmtime-wasi-crypto"]
 wasi-nn = ["wasmtime-wasi-nn"]
 uffd = ["wasmtime/uffd"]
+all-arch = ["wasmtime/all-arch"]
 
 # Try the experimental, work-in-progress new x86_64 backend. This is not stable
 # as of June 2020.

RELEASES.md

@@ -2,6 +2,47 @@
 
 --------------------------------------------------------------------------------
 
+## Unreleased
+
+### Added
+
+* Added the `wasmtime compile` command to support AOT compilation of Wasm modules.
+
+* Added the `Engine::precompile_module` method to support AOT module compilation.
+
+* Added the `Config::target` method to change the compilation target of the
+  configuration. This can be used in conjunction with `Engine::precompile_module`
+  to target a different host triple than the current one.
+
+* Added the `Config::cranelift_flag_enable` method to enable setting Cranelift
+  boolean flags or presets in a config.
+
+* Added CLI option `--cranelift-enable` to enable boolean settings and ISA presets.
+
+### Changed
+
+* Wasmtime CLI options to enable WebAssembly features have been replaced with a
+  singular `--wasm-features` option. The previous options are still supported, but
+  are not displayed in help text.
+
+* Breaking: `Module::deserialize` has been removed in favor of `Module::new`.
+
+* Breaking: `Config::cranelift_clear_cpu_flags` was removed. Use `Config::target`
+  to clear the CPU flags for the host's target.
+
+* Breaking: `Config::cranelift_other_flag` was renamed to `Config::cranelift_flag_set`.
+
+* Breaking: the CLI option `--cranelift-flags` was changed to `--cranelift-set`.
+
+* Breaking: the CLI option `--enable-reference-types=false` has been changed to
+  `--wasm-features=-reference-types`.
+
+* Breaking: the CLI option `--enable-multi-value=false` has been changed to
+  `--wasm-features=-multi-value`.
+
+* Breaking: the CLI option `--enable-bulk-memory=false` has been changed to
+  `--wasm-features=-bulk-memory`.
+
 ## 0.25.0
 
 Released 2021-03-16.
@@ -39,7 +80,7 @@ Released 2021-03-16.
 
 ### Fixed
 
-* Interepretation of timestamps in `poll_oneoff` for WASI have been fixed to
+* Interpretation of timestamps in `poll_oneoff` for WASI have been fixed to
   correctly use nanoseconds instead of microseconds.
   [#2717](https://github.com/bytecodealliance/wasmtime/pull/2717)
 

cranelift/Cargo.toml

@@ -53,3 +53,4 @@ wasm = ["wat", "cranelift-wasm"]
 experimental_x64 = ["cranelift-codegen/x64", "cranelift-filetests/experimental_x64", "cranelift-reader/experimental_x64"]
 experimental_arm32 = ["cranelift-codegen/arm32", "cranelift-filetests/experimental_arm32"]
 souper-harvest = ["cranelift-codegen/souper-harvest", "rayon"]
+all-arch = ["cranelift-codegen/all-arch"]

cranelift/codegen/meta/src/cdsl/settings.rs

@@ -20,6 +20,7 @@ pub(crate) enum SpecificSetting {
 #[derive(Hash, PartialEq, Eq)]
 pub(crate) struct Setting {
     pub name: &'static str,
+    pub description: &'static str,
     pub comment: &'static str,
     pub specific: SpecificSetting,
     pub byte_offset: u8,
@@ -88,6 +89,7 @@ impl Into<PresetType> for PresetIndex {
 #[derive(Hash, PartialEq, Eq)]
 pub(crate) struct Preset {
     pub name: &'static str,
+    pub description: &'static str,
     values: Vec<BoolSettingIndex>,
 }
 
@@ -169,6 +171,7 @@ pub(crate) enum ProtoSpecificSetting {
 /// This is the information provided during building for a setting.
 struct ProtoSetting {
     name: &'static str,
+    description: &'static str,
     comment: &'static str,
     specific: ProtoSpecificSetting,
 }
@@ -251,11 +254,13 @@ impl SettingGroupBuilder {
     fn add_setting(
         &mut self,
         name: &'static str,
+        description: &'static str,
         comment: &'static str,
         specific: ProtoSpecificSetting,
     ) {
         self.settings.push(ProtoSetting {
             name,
+            description,
             comment,
             specific,
         })
@@ -264,35 +269,63 @@ impl SettingGroupBuilder {
     pub fn add_bool(
         &mut self,
         name: &'static str,
+        description: &'static str,
         comment: &'static str,
         default: bool,
     ) -> BoolSettingIndex {
         assert!(
             self.predicates.is_empty(),
             "predicates must be added after the boolean settings"
         );
-        self.add_setting(name, comment, ProtoSpecificSetting::Bool(default));
+        self.add_setting(
+            name,
+            description,
+            comment,
+            ProtoSpecificSetting::Bool(default),
+        );
         BoolSettingIndex(self.settings.len() - 1)
     }
 
     pub fn add_enum(
         &mut self,
         name: &'static str,
+        description: &'static str,
         comment: &'static str,
         values: Vec<&'static str>,
     ) {
-        self.add_setting(name, comment, ProtoSpecificSetting::Enum(values));
+        self.add_setting(
+            name,
+            description,
+            comment,
+            ProtoSpecificSetting::Enum(values),
+        );
     }
 
-    pub fn add_num(&mut self, name: &'static str, comment: &'static str, default: u8) {
-        self.add_setting(name, comment, ProtoSpecificSetting::Num(default));
+    pub fn add_num(
+        &mut self,
+        name: &'static str,
+        description: &'static str,
+        comment: &'static str,
+        default: u8,
+    ) {
+        self.add_setting(
+            name,
+            description,
+            comment,
+            ProtoSpecificSetting::Num(default),
+        );
     }
 
     pub fn add_predicate(&mut self, name: &'static str, node: PredicateNode) {
         self.predicates.push(ProtoPredicate { name, node });
     }
 
-    pub fn add_preset(&mut self, name: &'static str, args: Vec<PresetType>) -> PresetIndex {
+    pub fn add_preset(
+        &mut self,
+        name: &'static str,
+        description: &'static str,
+        args: Vec<PresetType>,
+    ) -> PresetIndex {
         let mut values = Vec::new();
         for arg in args {
             match arg {
@@ -302,7 +335,11 @@ impl SettingGroupBuilder {
                 PresetType::BoolSetting(index) => values.push(index),
             }
         }
-        self.presets.push(Preset { name, values });
+        self.presets.push(Preset {
+            name,
+            description,
+            values,
+        });
         PresetIndex(self.presets.len() - 1)
     }
 
@@ -347,6 +384,7 @@ impl SettingGroupBuilder {
 
             group.settings.push(Setting {
                 name: s.name,
+                description: s.description,
                 comment: s.comment,
                 byte_offset,
                 specific,
@@ -367,6 +405,7 @@ impl SettingGroupBuilder {
             };
             group.settings.push(Setting {
                 name: s.name,
+                description: s.description,
                 comment: s.comment,
                 byte_offset: byte_offset + predicate_number / 8,
                 specific: SpecificSetting::Bool(BoolSetting {

cranelift/codegen/meta/src/gen_settings.rs

@@ -70,6 +70,33 @@ fn gen_constructor(group: &SettingGroup, parent: ParentGroup, fmt: &mut Formatte
     fmtln!(fmt, "}");
 }
 
+/// Generates the `iter` function.
+fn gen_iterator(group: &SettingGroup, fmt: &mut Formatter) {
+    fmtln!(fmt, "impl Flags {");
+    fmt.indent(|fmt| {
+        fmt.doc_comment("Iterates the setting values.");
+        fmtln!(fmt, "pub fn iter(&self) -> impl Iterator<Item = Value> {");
+        fmt.indent(|fmt| {
+            fmtln!(fmt, "let mut bytes = [0; {}];", group.settings_size);
+            fmtln!(fmt, "bytes.copy_from_slice(&self.bytes[0..{}]);", group.settings_size);
+            fmtln!(fmt, "DESCRIPTORS.iter().filter_map(move |d| {");
+            fmt.indent(|fmt| {
+                fmtln!(fmt, "let values = match &d.detail {");
+                fmt.indent(|fmt| {
+                    fmtln!(fmt, "detail::Detail::Preset => return None,");
+                    fmtln!(fmt, "detail::Detail::Enum { last, enumerators } => Some(TEMPLATE.enums(*last, *enumerators)),");
+                    fmtln!(fmt, "_ => None");
+                });
+                fmtln!(fmt, "};");
+                fmtln!(fmt, "Some(Value{ name: d.name, detail: d.detail, values, value: bytes[d.offset as usize] })");
+            });
+            fmtln!(fmt, "})");
+        });
+        fmtln!(fmt, "}");
+    });
+    fmtln!(fmt, "}");
+}
+
 /// Emit Display and FromStr implementations for enum settings.
 fn gen_to_and_from_str(name: &str, values: &[&'static str], fmt: &mut Formatter) {
     fmtln!(fmt, "impl fmt::Display for {} {{", name);
@@ -136,7 +163,7 @@ fn gen_enum_types(group: &SettingGroup, fmt: &mut Formatter) {
 
 /// Emit a getter function for `setting`.
 fn gen_getter(setting: &Setting, fmt: &mut Formatter) {
-    fmt.doc_comment(setting.comment);
+    fmt.doc_comment(format!("{}\n{}", setting.description, setting.comment));
     match setting.specific {
         SpecificSetting::Bool(BoolSetting {
             predicate_number, ..
@@ -254,6 +281,7 @@ fn gen_descriptors(group: &SettingGroup, fmt: &mut Formatter) {
             fmtln!(fmt, "detail::Descriptor {");
             fmt.indent(|fmt| {
                 fmtln!(fmt, "name: \"{}\",", setting.name);
+                fmtln!(fmt, "description: \"{}\",", setting.description);
                 fmtln!(fmt, "offset: {},", setting.byte_offset);
                 match setting.specific {
                     SpecificSetting::Bool(BoolSetting { bit_offset, .. }) => {
@@ -286,6 +314,7 @@ fn gen_descriptors(group: &SettingGroup, fmt: &mut Formatter) {
             fmtln!(fmt, "detail::Descriptor {");
             fmt.indent(|fmt| {
                 fmtln!(fmt, "name: \"{}\",", preset.name);
+                fmtln!(fmt, "description: \"{}\",", preset.description);
                 fmtln!(fmt, "offset: {},", (idx as u8) * group.settings_size);
                 fmtln!(fmt, "detail: detail::Detail::Preset,");
             });
@@ -427,6 +456,7 @@ fn gen_group(group: &SettingGroup, parent: ParentGroup, fmt: &mut Formatter) {
     fmtln!(fmt, "}");
 
     gen_constructor(group, parent, fmt);
+    gen_iterator(group, fmt);
     gen_enum_types(group, fmt);
     gen_getters(group, fmt);
     gen_descriptors(group, fmt);

cranelift/codegen/meta/src/isa/arm64/mod.rs

@@ -9,7 +9,7 @@ use crate::shared::Definitions as SharedDefinitions;
 
 fn define_settings(_shared: &SettingGroup) -> SettingGroup {
     let mut setting = SettingGroupBuilder::new("arm64");
-    let has_lse = setting.add_bool("has_lse", "Large System Extensions", false);
+    let has_lse = setting.add_bool("has_lse", "Has Large System Extensions support.", "", false);
 
     setting.add_predicate("use_lse", predicate!(has_lse));
     setting.build()

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

@@ -17,33 +17,39 @@ fn define_settings(shared: &SettingGroup) -> SettingGroup {
     let supports_m = setting.add_bool(
         "supports_m",
         "CPU supports the 'M' extension (mul/div)",
+        "",
         false,
     );
     let supports_a = setting.add_bool(
         "supports_a",
         "CPU supports the 'A' extension (atomics)",
+        "",
         false,
     );
     let supports_f = setting.add_bool(
         "supports_f",
         "CPU supports the 'F' extension (float)",
+        "",
         false,
     );
     let supports_d = setting.add_bool(
         "supports_d",
         "CPU supports the 'D' extension (double)",
+        "",
         false,
     );
 
     let enable_m = setting.add_bool(
         "enable_m",
         "Enable the use of 'M' instructions if available",
+        "",
         true,
     );
 
     setting.add_bool(
         "enable_e",
         "Enable the 'RV32E' instruction set with only 16 registers",
+        "",
         false,
     );