v0.3: ELF symbol parsing, sym()/addr()/symbols() globals, addrstr/here prelude helpers

src/js.rs

@@ -318,6 +318,53 @@ fn install_globals<'js>(
         globals.set("prev", prev_obj)?;
     }
 
+    // ---------- sym(addr) -> "name+0xN" | null ----------
+    {
+        let target = target.clone();
+        let f = Function::new(c.clone(), move |c: Ctx<'js>, addr: Value<'js>| -> rquickjs::Result<Value<'js>> {
+            let addr = coerce_addr(&c, &addr)?;
+            let slot = target.borrow();
+            let t = slot.as_ref().ok_or_else(|| throw(&c, "no target attached"))?;
+            let s = t.symbols().ok_or_else(|| throw(&c, "no symbol table"))?;
+            match s.name_for_addr(addr) {
+                Some(name) => Ok(rquickjs::String::from_str(c.clone(), &name)?.into_value()),
+                None => Ok(Value::new_null(c.clone())),
+            }
+        })?;
+        globals.set("sym", f)?;
+    }
+
+    // ---------- addr(name) -> BigInt | null ----------
+    {
+        let target = target.clone();
+        let f = Function::new(c.clone(), move |c: Ctx<'js>, name: String| -> rquickjs::Result<Value<'js>> {
+            let slot = target.borrow();
+            let t = slot.as_ref().ok_or_else(|| throw(&c, "no target attached"))?;
+            let s = t.symbols().ok_or_else(|| throw(&c, "no symbol table"))?;
+            match s.addr_for_name(&name) {
+                Some(a) => u64_to_bigint(&c, a),
+                None => Ok(Value::new_null(c.clone())),
+            }
+        })?;
+        globals.set("addr", f)?;
+    }
+
+    // ---------- symbols() -> { count, load_base, path } ----------
+    {
+        let target = target.clone();
+        let f = Function::new(c.clone(), move |c: Ctx<'js>| -> rquickjs::Result<Value<'js>> {
+            let slot = target.borrow();
+            let t = slot.as_ref().ok_or_else(|| throw(&c, "no target attached"))?;
+            let s = t.symbols().ok_or_else(|| throw(&c, "no symbol table"))?;
+            let obj = Object::new(c.clone())?;
+            obj.set("count", s.len() as u32)?;
+            obj.set("load_base", u64_to_bigint(&c, s.load_base)?)?;
+            obj.set("path", s.path.to_string_lossy().into_owned())?;
+            Ok(obj.into_value())
+        })?;
+        globals.set("symbols", f)?;
+    }
+
     // ---------- JS-side prelude ---------------------------------------------
     // Loaded last, so it can reference any of the native globals above.
     // Lives in src/prelude.js, embedded at compile time.