From b78f1c12617e7a79ad47df6c5df4a3e43700c537 Mon Sep 17 00:00:00 2001
From: Gunnar Beutner <gbeutner@serenityos.org>
Date: Wed, 9 Jun 2021 18:18:56 +0200
Subject: LibJS: Generate bytecode for throw statements

---
 Userland/Libraries/LibJS/AST.h                   |  1 +
 Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp |  7 +++++++
 Userland/Libraries/LibJS/Bytecode/Instruction.h  |  3 ++-
 Userland/Libraries/LibJS/Bytecode/Op.cpp         | 11 +++++++++++
 Userland/Libraries/LibJS/Bytecode/Op.h           | 14 ++++++++++++++
 5 files changed, 35 insertions(+), 1 deletion(-)

(limited to 'Userland/Libraries')

diff --git a/Userland/Libraries/LibJS/AST.h b/Userland/Libraries/LibJS/AST.h
index 76176fb771..18c8a0b130 100644
--- a/Userland/Libraries/LibJS/AST.h
+++ b/Userland/Libraries/LibJS/AST.h
@@ -1245,6 +1245,7 @@ public:
 
     virtual void dump(int indent) const override;
     virtual Value execute(Interpreter&, GlobalObject&) const override;
+    virtual void generate_bytecode(Bytecode::Generator&) const override;
 
 private:
     NonnullRefPtr<Expression> m_argument;
diff --git a/Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp b/Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
index 866a143136..1db9b3f5e8 100644
--- a/Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
+++ b/Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
  * Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
+ * Copyright (c) 2021, Gunnar Beutner <gbeutner@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -668,4 +669,10 @@ void UpdateExpression::generate_bytecode(Bytecode::Generator& generator) const
     TODO();
 }
 
+void ThrowStatement::generate_bytecode(Bytecode::Generator& generator) const
+{
+    m_argument->generate_bytecode(generator);
+    generator.emit<Bytecode::Op::Throw>();
+}
+
 }
diff --git a/Userland/Libraries/LibJS/Bytecode/Instruction.h b/Userland/Libraries/LibJS/Bytecode/Instruction.h
index 9b67fa096c..b52a712123 100644
--- a/Userland/Libraries/LibJS/Bytecode/Instruction.h
+++ b/Userland/Libraries/LibJS/Bytecode/Instruction.h
@@ -56,7 +56,8 @@
     O(InstanceOf)                 \
     O(ConcatString)               \
     O(Increment)                  \
-    O(Decrement)
+    O(Decrement)                  \
+    O(Throw)
 
 namespace JS::Bytecode {
 
diff --git a/Userland/Libraries/LibJS/Bytecode/Op.cpp b/Userland/Libraries/LibJS/Bytecode/Op.cpp
index cea771567f..cdd26dd7ba 100644
--- a/Userland/Libraries/LibJS/Bytecode/Op.cpp
+++ b/Userland/Libraries/LibJS/Bytecode/Op.cpp
@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
  * Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
+ * Copyright (c) 2021, Gunnar Beutner <gbeutner@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -255,6 +256,11 @@ void Decrement::execute(Bytecode::Interpreter& interpreter) const
         interpreter.accumulator() = js_bigint(interpreter.vm().heap(), old_value.as_bigint().big_integer().minus(Crypto::SignedBigInteger { 1 }));
 }
 
+void Throw::execute(Bytecode::Interpreter& interpreter) const
+{
+    interpreter.vm().throw_exception(interpreter.global_object(), interpreter.accumulator());
+}
+
 String Load::to_string(Bytecode::Executable const&) const
 {
     return String::formatted("Load {}", m_src);
@@ -383,4 +389,9 @@ String Decrement::to_string(Bytecode::Executable const&) const
     return "Decrement";
 }
 
+String Throw::to_string(Bytecode::Executable const&) const
+{
+    return "Throw";
+}
+
 }
diff --git a/Userland/Libraries/LibJS/Bytecode/Op.h b/Userland/Libraries/LibJS/Bytecode/Op.h
index 7398724afc..8893bf925e 100644
--- a/Userland/Libraries/LibJS/Bytecode/Op.h
+++ b/Userland/Libraries/LibJS/Bytecode/Op.h
@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
  * Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
+ * Copyright (c) 2021, Gunnar Beutner <gbeutner@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -395,6 +396,19 @@ public:
     String to_string(Bytecode::Executable const&) const;
 };
 
+class Throw final : public Instruction {
+public:
+    constexpr static bool IsTerminator = true;
+
+    Throw()
+        : Instruction(Type::Throw)
+    {
+    }
+
+    void execute(Bytecode::Interpreter&) const;
+    String to_string(Bytecode::Executable const&) const;
+};
+
 }
 
 namespace JS::Bytecode {
-- 
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