mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 17:22:43 +00:00
619cd613d0
A large number of JS strings are a single ASCII character. This patch adds a 128-entry cache for those strings to the VM. The cost of the cache is 1536 byte of GC heap (all in same block) + 2304 bytes malloc. This avoids a lot of GC heap allocations, and packing all of these in the same heap block is nice for fragmentation as well.
57 lines
2 KiB
C++
57 lines
2 KiB
C++
/*
|
|
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <LibJS/Runtime/PrimitiveString.h>
|
|
#include <LibJS/Runtime/VM.h>
|
|
|
|
namespace JS {
|
|
|
|
PrimitiveString::PrimitiveString(String string)
|
|
: m_string(move(string))
|
|
{
|
|
}
|
|
|
|
PrimitiveString::~PrimitiveString()
|
|
{
|
|
}
|
|
|
|
PrimitiveString* js_string(Heap& heap, String string)
|
|
{
|
|
if (string.is_empty())
|
|
return &heap.vm().empty_string();
|
|
|
|
if (string.length() == 1 && (u8)string.characters()[0] < 0x80)
|
|
return &heap.vm().single_ascii_character_string(string.characters()[0]);
|
|
|
|
return heap.allocate_without_global_object<PrimitiveString>(move(string));
|
|
}
|
|
|
|
PrimitiveString* js_string(VM& vm, String string)
|
|
{
|
|
return js_string(vm.heap(), move(string));
|
|
}
|
|
|
|
}
|