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LibJS: Some more opcodes for the bytecode VM

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- NewString (allocates a new PrimitiveString from the GC heap)
- GetVariable (retrieves a variable in the current scope)
- SetVariable (assigns a variable in the current scope)
This commit is contained in:
Andreas Kling 2021-06-03 18:26:32 +02:00
parent 6da5d17416
commit 37cb70836b
4 changed files with 113 additions and 0 deletions
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31
Userland/Libraries/LibJS/Bytecode/Op.cpp
View file

@ -6,6 +6,7 @@
#include <LibJS/Bytecode/Interpreter.h>
#include <LibJS/Bytecode/Op.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Value.h>
namespace JS::Bytecode::Op {
@ -20,6 +21,21 @@ void Add::execute(Bytecode::Interpreter& interpreter) const
interpreter.reg(m_dst) = add(interpreter.global_object(), interpreter.reg(m_src1), interpreter.reg(m_src2));
}
void NewString::execute(Bytecode::Interpreter& interpreter) const
{
interpreter.reg(m_dst) = js_string(interpreter.vm(), m_string);
}
void GetVariable::execute(Bytecode::Interpreter& interpreter) const
{
interpreter.reg(m_dst) = interpreter.vm().get_variable(m_identifier, interpreter.global_object());
}
void SetVariable::execute(Bytecode::Interpreter& interpreter) const
{
interpreter.vm().set_variable(m_identifier, interpreter.reg(m_src), interpreter.global_object());
}
String Load::to_string() const
{
return String::formatted("Load dst:r{}, value:{}", m_dst.index(), m_value.to_string_without_side_effects());
@ -30,4 +46,19 @@ String Add::to_string() const
return String::formatted("Add dst:r{}, src1:r{}, src2:r{}", m_dst.index(), m_src1.index(), m_src2.index());
}
String NewString::to_string() const
{
return String::formatted("NewString dst:r{}, string:\"{}\"", m_dst.index(), m_string);
}
String GetVariable::to_string() const
{
return String::formatted("GetVariable dst:r{}, identifier:{}", m_dst.index(), m_identifier);
}
String SetVariable::to_string() const
{
return String::formatted("SetVariable identifier:{}, src:r{}", m_identifier, m_src.index());
}
}

52
Userland/Libraries/LibJS/Bytecode/Op.h
View file

@ -6,6 +6,7 @@
#pragma once
#include <AK/FlyString.h>
#include <LibJS/Bytecode/Instruction.h>
#include <LibJS/Bytecode/Register.h>
#include <LibJS/Heap/Cell.h>
@ -49,4 +50,55 @@ private:
Register m_src2;
};
class NewString final : public Instruction {
public:
NewString(Register dst, String string)
: m_dst(dst)
, m_string(move(string))
{
}
virtual ~NewString() override { }
virtual void execute(Bytecode::Interpreter&) const override;
virtual String to_string() const override;
private:
Register m_dst;
String m_string;
};
class SetVariable final : public Instruction {
public:
SetVariable(FlyString identifier, Register src)
: m_identifier(move(identifier))
, m_src(src)
{
}
virtual ~SetVariable() override { }
virtual void execute(Bytecode::Interpreter&) const override;
virtual String to_string() const override;
private:
FlyString m_identifier;
Register m_src;
};
class GetVariable final : public Instruction {
public:
GetVariable(Register dst, FlyString identifier)
: m_dst(dst)
, m_identifier(move(identifier))
{
}
virtual ~GetVariable() override { }
virtual void execute(Bytecode::Interpreter&) const override;
virtual String to_string() const override;
private:
Register m_dst;
FlyString m_identifier;
};
}