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LibJS: Generate bytecode for entering nested lexical environments

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This adds a new PushLexicalEnvironment instruction that creates a new
LexicalEnvironment and pushes it on the VM's scope stack.

There is no corresponding PopLexicalEnvironment instruction yet,
so this will behave incorrectly with let/const scopes for example.
This commit is contained in:
Andreas Kling 2021-06-10 22:12:21 +02:00
parent d560ee118d
commit c3c68399b5
4 changed files with 92 additions and 1 deletions
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14
Userland/Libraries/LibJS/Bytecode/Op.h
View file

@ -14,6 +14,7 @@
#include <LibJS/Bytecode/Register.h>
#include <LibJS/Bytecode/StringTable.h>
#include <LibJS/Heap/Cell.h>
#include <LibJS/Runtime/ScopeObject.h>
#include <LibJS/Runtime/Value.h>
namespace JS::Bytecode::Op {
@ -453,6 +454,19 @@ public:
private:
Label m_resume_target;
};
class PushLexicalEnvironment final : public Instruction {
public:
PushLexicalEnvironment(HashMap<u32, Variable> variables)
: Instruction(Type::PushLexicalEnvironment)
, m_variables(move(variables))
{
}
void execute(Bytecode::Interpreter&) const;
String to_string(Bytecode::Executable const&) const;
HashMap<u32, Variable> m_variables;
};
}
namespace JS::Bytecode {