Better Return opcode generation

Author: HalidOdat

boa_engine/src/bytecompiler/class.rs

@@ -75,7 +75,6 @@ impl ByteCompiler<'_, '_> {
         }
 
         compiler.emit_opcode(Opcode::SetReturnValue);
-        compiler.emit_opcode(Opcode::Return);
 
         let code = Gc::new(compiler.finish());
         let index = self.functions.len() as u32;
@@ -272,7 +271,6 @@ impl ByteCompiler<'_, '_> {
                     field_compiler.pop_compile_environment();
 
                     field_compiler.emit_opcode(Opcode::SetReturnValue);
-                    field_compiler.emit_opcode(Opcode::Return);
 
                     field_compiler.code_block_flags |= CodeBlockFlags::IN_CLASS_FIELD_INITIALIZER;
 
@@ -306,7 +304,6 @@ impl ByteCompiler<'_, '_> {
                     field_compiler.pop_compile_environment();
 
                     field_compiler.emit_opcode(Opcode::SetReturnValue);
-                    field_compiler.emit_opcode(Opcode::Return);
 
                     field_compiler.code_block_flags |= CodeBlockFlags::IN_CLASS_FIELD_INITIALIZER;
 
@@ -350,7 +347,6 @@ impl ByteCompiler<'_, '_> {
                     field_compiler.pop_compile_environment();
 
                     field_compiler.emit_opcode(Opcode::SetReturnValue);
-                    field_compiler.emit_opcode(Opcode::Return);
 
                     field_compiler.code_block_flags |= CodeBlockFlags::IN_CLASS_FIELD_INITIALIZER;
 

boa_engine/src/bytecompiler/function.rs

@@ -4,7 +4,7 @@ use crate::{
     builtins::function::ThisMode,
     bytecompiler::ByteCompiler,
     environments::CompileTimeEnvironment,
-    vm::{CodeBlock, CodeBlockFlags, Opcode},
+    vm::{CodeBlock, CodeBlockFlags},
     Context,
 };
 use boa_ast::function::{FormalParameterList, FunctionBody};
@@ -151,15 +151,6 @@ impl FunctionCompiler {
 
         compiler.params = parameters.clone();
 
-        if compiler
-            .bytecode
-            .last()
-            .filter(|last| **last == Opcode::Return as u8)
-            .is_none()
-        {
-            compiler.emit_opcode(Opcode::Return);
-        }
-
         Gc::new(compiler.finish())
     }
 }

boa_engine/src/bytecompiler/mod.rs

@@ -1415,6 +1415,7 @@ impl<'ctx, 'host> ByteCompiler<'ctx, 'host> {
         for ret in self.returns_to_patch.clone() {
             self.patch_jump(ret);
         }
+        self.emit_opcode(Opcode::Return);
 
         let name = self
             .context

boa_engine/src/bytecompiler/statement/mod.rs

@@ -90,11 +90,8 @@ impl ByteCompiler<'_, '_> {
 
     pub(crate) fn r#return(&mut self) {
         let actions = self.return_jump_record_actions();
-
         JumpRecord::new(JumpRecordKind::Return, Self::DUMMY_LABEL, actions)
             .perform_actions(u32::MAX, self);
-
-        self.emit_opcode(Opcode::Return);
     }
 
     fn return_jump_record_actions(&self) -> Vec<JumpRecordAction> {