[meta] Port Formats and Operands to the Rust crate;

cranelift/codegen/meta/src/shared/mod.rs

@@ -1,4 +1,55 @@
 //! Shared definitions for the Cranelift intermediate language.
 
+pub mod entities;
+pub mod formats;
+pub mod immediates;
 pub mod settings;
 pub mod types;
+
+use crate::cdsl::formats::FormatRegistry;
+use crate::cdsl::operands::OperandKind;
+use crate::cdsl::settings::SettingGroup;
+
+pub struct Definitions {
+    pub settings: SettingGroup,
+    pub operand_kinds: OperandKinds,
+    pub format_registry: FormatRegistry,
+}
+
+pub struct OperandKinds(Vec<OperandKind>);
+
+impl OperandKinds {
+    pub fn new() -> Self {
+        Self(Vec::new())
+    }
+
+    pub fn by_name(&self, name: &'static str) -> &OperandKind {
+        self.0
+            .iter()
+            .find(|op| op.name == name)
+            .expect(&format!("unknown Operand name: {}", name))
+    }
+
+    pub fn push(&mut self, operand_kind: OperandKind) {
+        assert!(
+            self.0
+                .iter()
+                .find(|existing| existing.name == operand_kind.name)
+                .is_none(),
+            "trying to insert operand kind '{}' for the second time",
+            operand_kind.name
+        );
+        self.0.push(operand_kind);
+    }
+}
+
+pub fn define() -> Definitions {
+    let immediates = OperandKinds(immediates::define());
+    let entities = OperandKinds(entities::define());
+    let format_registry = formats::define(&immediates, &entities);
+    Definitions {
+        settings: settings::define(),
+        operand_kinds: immediates,
+        format_registry,
+    }
+}