Add setlocal and getlocal

Merged: https://github.com/ruby/ruby/pull/13131

zjit/src/ir.rs

@@ -7,7 +7,7 @@ pub struct InsnId(usize);
 pub struct BlockId(usize);
 
 /// Instruction operand
-#[derive(Debug, PartialEq)]
+#[derive(Debug, PartialEq, Clone, Copy)]
 enum Opnd {
     Const(VALUE),
     Insn(InsnId),
@@ -15,7 +15,7 @@ enum Opnd {
 
 #[derive(Debug, PartialEq)]
 enum Insn {
-    // SSA block parameter
+    // SSA block parameter. Also used for function parameters in the function's entry block.
     Param { idx: usize },
     Return { val: Opnd },
 }
@@ -53,6 +53,8 @@ impl Function {
 enum RubyOpcode {
     Putnil,
     Putobject(VALUE),
+    Setlocal(usize),
+    Getlocal(usize),
     Leave,
 }
 
@@ -62,11 +64,12 @@ struct FrameState {
     // pc:
 
     stack: Vec<Opnd>,
+    locals: Vec<Opnd>,
 }
 
 impl FrameState {
     fn new() -> FrameState {
-        FrameState { stack: vec![] }
+        FrameState { stack: vec![], locals: vec![] }
     }
 
     fn push(&mut self, opnd: Opnd) {
@@ -76,6 +79,20 @@ impl FrameState {
     fn pop(&mut self) -> Opnd {
         self.stack.pop().expect("Bytecode stack mismatch")
     }
+
+    fn setlocal(&mut self, idx: usize, opnd: Opnd) {
+        if idx >= self.locals.len() {
+            self.locals.resize(idx+1, Opnd::Const(Qnil));
+        }
+        self.locals[idx] = opnd;
+    }
+
+    fn getlocal(&mut self, idx: usize) -> Opnd {
+        if idx >= self.locals.len() {
+            self.locals.resize(idx+1, Opnd::Const(Qnil));
+        }
+        self.locals[idx]
+    }
 }
 
 fn to_ssa(opcodes: &Vec<RubyOpcode>) -> Function {
@@ -86,6 +103,14 @@ fn to_ssa(opcodes: &Vec<RubyOpcode>) -> Function {
         match opcode {
             RubyOpcode::Putnil => { state.push(Opnd::Const(Qnil)); },
             RubyOpcode::Putobject(val) => { state.push(Opnd::Const(*val)); },
+            RubyOpcode::Setlocal(idx) => {
+                let val = state.pop();
+                state.setlocal(*idx, val);
+            }
+            RubyOpcode::Getlocal(idx) => {
+                let val = state.getlocal(*idx);
+                state.push(val);
+            }
             RubyOpcode::Leave => {
                 result.push_insn(block, Insn::Return { val: state.pop() });
             },