feat(vm): threaded VM

fix/src/lib.rs

@@ -2,6 +2,7 @@
 #![allow(dead_code)]
 
 use bumpalo::Bump;
+use fix_codegen::disassembler::{Disassembler, DisassemblerContext};
 use fix_codegen::{BytecodeContext, InstructionPtr};
 use fix_common::{StringId, Symbol};
 use fix_error::{Error, Result, Source};
@@ -10,7 +11,7 @@ use fix_ir::{Ir, IrRef, RawIrRef, ThunkId};
 use fix_vm::{ForceMode, StaticValue, Vm, VmContext};
 use ghost_cell::{GhostCell, GhostToken};
 use hashbrown::{HashMap, HashSet};
-use string_interner::DefaultStringInterner;
+use string_interner::{DefaultStringInterner, Symbol as _};
 
 // mod fetcher;
 // mod nar;
@@ -105,6 +106,10 @@ impl Evaluator {
         Ok(ip)
     }
 
+    pub fn disassemble_colored(&self, ip: InstructionPtr) -> String {
+        Disassembler::new(ip, self).disassemble_colored()
+    }
+
     fn downgrade_ctx<'a, 'bump, 'id>(
         &'a mut self,
         bump: &'bump Bump,
@@ -553,3 +558,15 @@ impl BytecodeContext for Evaluator {
         self.constants.insert(val)
     }
 }
+
+impl DisassemblerContext for Evaluator {
+    fn get_code(&self) -> &[u8] {
+        &self.bytecode
+    }
+
+    #[allow(clippy::unwrap_used)]
+    fn resolve_string(&self, id: u32) -> &str {
+        let id = string_interner::symbol::SymbolU32::try_from_usize(id as usize).unwrap();
+        self.strings.resolve(id).unwrap()
+    }
+}