implement opcode fromaltstack

keep-starknet-strange · Jul 26, 2024 · a4c8ac0 · a4c8ac0
1 parent 6e00f2e
commit a4c8ac0
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Showing 2 changed files with 9 additions and 1 deletion.
diff --git a/src/compiler.cairo b/src/compiler.cairo
@@ -40,6 +40,7 @@ pub impl CompilerTraitImpl of CompilerTrait {
         opcodes.insert('OP_1ADD', Opcode::OP_1ADD);
         opcodes.insert('OP_ADD', Opcode::OP_ADD);
         opcodes.insert('OP_MAX', Opcode::OP_MAX);
+        opcodes.insert('OP_FROMALTSTACK', Opcode::OP_FROMALTSTACK);
         Compiler { opcodes }
     }
 

diff --git a/src/opcodes/opcodes.cairo b/src/opcodes/opcodes.cairo
@@ -21,6 +21,7 @@ pub mod Opcode {
     pub const OP_1ADD: u8 = 139;
     pub const OP_ADD: u8 = 147;
     pub const OP_MAX: u8 = 164;
+    pub const OP_FROMALTSTACK: u8 = 108;
 
     use shinigami::engine::Engine;
     use shinigami::stack::ScriptStackTrait;
@@ -134,7 +135,7 @@ pub mod Opcode {
             105 => not_implemented(ref engine),
             106 => not_implemented(ref engine),
             107 => not_implemented(ref engine),
-            108 => not_implemented(ref engine),
+            108 => opcode_fromaltstack(ref engine),
             109 => not_implemented(ref engine),
             110 => not_implemented(ref engine),
             111 => not_implemented(ref engine),
@@ -234,4 +235,10 @@ pub mod Opcode {
             b
         });
     }
+
+    fn opcode_fromaltstack(ref engine: Engine) {
+        //TODO: Error handling
+        let a = engine.astack.pop_byte_array();
+        engine.dstack.push_byte_array(a);
+    }
 }