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ladybird/Userland/Libraries/LibJS/Runtime/Exception.h

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LibJS: Implement "throw" You can now throw an expression to the nearest catcher! :^) To support throwing arbitrary values, I added an Exception class that sits as a wrapper around whatever is thrown. In the future it will be a logical place to store a call stack.
2020-03-24 22:03:50 +01:00
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
LibJS: Use linusg@serenityos.org for my new copyright headers, too Whoops, I have a new email for these! :^)
2021-04-24 20:16:31 +02:00
* Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
LibJS: Implement "throw" You can now throw an expression to the nearest catcher! :^) To support throwing arbitrary values, I added an Exception class that sits as a wrapper around whatever is thrown. In the future it will be a logical place to store a call stack.
2020-03-24 22:03:50 +01:00
*
Everything: Move to SPDX license identifiers in all files. SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
2021-04-22 01:24:48 -07:00
* SPDX-License-Identifier: BSD-2-Clause
LibJS: Implement "throw" You can now throw an expression to the nearest catcher! :^) To support throwing arbitrary values, I added an Exception class that sits as a wrapper around whatever is thrown. In the future it will be a logical place to store a call stack.
2020-03-24 22:03:50 +01:00
*/
Meta: Add a script check the presence of "#pragma once" in header files .. and make travis run it. I renamed check-license-headers.sh to check-style.sh and expanded it so that it now also checks for the presence of "#pragma once" in .h files. It also checks the presence of a (single) blank line above and below the "#pragma once" line. I also added "#pragma once" to all the files that need it: even the ones we are not check. I also added/removed blank lines in order to make the script not fail. I also ran clang-format on the files I modified.
2020-05-28 20:40:53 +02:00
#pragma once
LibJS: Consolidate exception function names and source ranges Instead of storing the function names (in a badly named Vector<String>) and source ranges separately, consolidate them into a new struct: TracebackFrame. This makes it both easier to use now and easier to extend in the future. Unlike before we now keep each call frame's current node source range in the traceback frame next to the function name, meaning we can display line and column numbers outside of the VM and after the call stack is emptied.
2021-04-24 18:15:02 +02:00
#include <AK/FlyString.h>
LibJS: Move most of Interpreter into VM This patch moves the exception state, call stack and scope stack from Interpreter to VM. I'm doing this to help myself discover what the split between Interpreter and VM should be, by shuffling things around and seeing what falls where. With these changes, we no longer have a persistent lexical environment for the current global object on the Interpreter's call stack. Instead, we push/pop that environment on Interpreter::run() enter/exit. Since it should only be used to find the global "this", and not for variable storage (that goes directly into the global object instead!), I had to insert some short-circuiting when walking the environment parent chain during variable lookup. Note that this is a "stepping stone" commit, not a final design.
2020-09-27 15:18:55 +02:00
#include <AK/Vector.h>
LibJS: Implement "throw" You can now throw an expression to the nearest catcher! :^) To support throwing arbitrary values, I added an Exception class that sits as a wrapper around whatever is thrown. In the future it will be a logical place to store a call stack.
2020-03-24 22:03:50 +01:00
#include <LibJS/Runtime/Cell.h>
#include <LibJS/Runtime/Value.h>
LibJS: Track source positions all the way down to exceptions This makes exceptions have a trace of source positions too, which could probably be helpful in making fancier error tracebacks.
2020-12-28 20:45:22 +03:30
#include <LibJS/SourceRange.h>
LibJS: Implement "throw" You can now throw an expression to the nearest catcher! :^) To support throwing arbitrary values, I added an Exception class that sits as a wrapper around whatever is thrown. In the future it will be a logical place to store a call stack.
2020-03-24 22:03:50 +01:00
namespace JS {
LibJS: Consolidate exception function names and source ranges Instead of storing the function names (in a badly named Vector<String>) and source ranges separately, consolidate them into a new struct: TracebackFrame. This makes it both easier to use now and easier to extend in the future. Unlike before we now keep each call frame's current node source range in the traceback frame next to the function name, meaning we can display line and column numbers outside of the VM and after the call stack is emptied.
2021-04-24 18:15:02 +02:00
struct TracebackFrame {
FlyString function_name;
SourceRange source_range;
};
LibJS: Implement "throw" You can now throw an expression to the nearest catcher! :^) To support throwing arbitrary values, I added an Exception class that sits as a wrapper around whatever is thrown. In the future it will be a logical place to store a call stack.
2020-03-24 22:03:50 +01:00
class Exception : public Cell {
public:
explicit Exception(Value);
LibJS: Consolidate exception function names and source ranges Instead of storing the function names (in a badly named Vector<String>) and source ranges separately, consolidate them into a new struct: TracebackFrame. This makes it both easier to use now and easier to extend in the future. Unlike before we now keep each call frame's current node source range in the traceback frame next to the function name, meaning we can display line and column numbers outside of the VM and after the call stack is emptied.
2021-04-24 18:15:02 +02:00
virtual ~Exception() override = default;
LibJS: Implement "throw" You can now throw an expression to the nearest catcher! :^) To support throwing arbitrary values, I added an Exception class that sits as a wrapper around whatever is thrown. In the future it will be a logical place to store a call stack.
2020-03-24 22:03:50 +01:00
Value value() const { return m_value; }
LibJS: Consolidate exception function names and source ranges Instead of storing the function names (in a badly named Vector<String>) and source ranges separately, consolidate them into a new struct: TracebackFrame. This makes it both easier to use now and easier to extend in the future. Unlike before we now keep each call frame's current node source range in the traceback frame next to the function name, meaning we can display line and column numbers outside of the VM and after the call stack is emptied.
2021-04-24 18:15:02 +02:00
const Vector<TracebackFrame>& traceback() const { return m_traceback; }
LibJS: Implement "throw" You can now throw an expression to the nearest catcher! :^) To support throwing arbitrary values, I added an Exception class that sits as a wrapper around whatever is thrown. In the future it will be a logical place to store a call stack.
2020-03-24 22:03:50 +01:00
private:
virtual const char* class_name() const override { return "Exception"; }
LibJS: Rename Cell::visit_children() => Cell::visit_edges() The GC heap is really a graph of cells, so "children" didn't quite feel appropriate here.
2020-11-28 14:33:36 +01:00
virtual void visit_edges(Visitor&) override;
LibJS: Implement "throw" You can now throw an expression to the nearest catcher! :^) To support throwing arbitrary values, I added an Exception class that sits as a wrapper around whatever is thrown. In the future it will be a logical place to store a call stack.
2020-03-24 22:03:50 +01:00
Value m_value;
LibJS: Consolidate exception function names and source ranges Instead of storing the function names (in a badly named Vector<String>) and source ranges separately, consolidate them into a new struct: TracebackFrame. This makes it both easier to use now and easier to extend in the future. Unlike before we now keep each call frame's current node source range in the traceback frame next to the function name, meaning we can display line and column numbers outside of the VM and after the call stack is emptied.
2021-04-24 18:15:02 +02:00
Vector<TracebackFrame> m_traceback;
LibJS: Implement "throw" You can now throw an expression to the nearest catcher! :^) To support throwing arbitrary values, I added an Exception class that sits as a wrapper around whatever is thrown. In the future it will be a logical place to store a call stack.
2020-03-24 22:03:50 +01:00
};
}
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