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LibJS: Port the VM's single-character ASCII strings to String

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This creates the Strings representing the ASCII characters at compile
time, then creates the PrimitiveStrings from those Strings when the VM
is created.
This commit is contained in:
Timothy Flynn 2023-01-21 12:36:47 -05:00 • committed by Linus Groh
parent 12c8bc3e85
commit 243caa8fa9
1 changed files with 12 additions and 3 deletions
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15
Userland/Libraries/LibJS/Runtime/VM.cpp
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@ -6,6 +6,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Array.h>
#include <AK/Debug.h>
#include <AK/LexicalPath.h>
#include <AK/ScopeGuard.h>
@ -37,14 +38,22 @@ NonnullRefPtr<VM> VM::create(OwnPtr<CustomData> custom_data)
return adopt_ref(*new VM(move(custom_data)));
}
template<u32... code_points>
static constexpr auto make_single_ascii_character_strings(IndexSequence<code_points...>)
{
return AK::Array { (String::from_code_point(code_points))... };
}
static constexpr auto single_ascii_character_strings = make_single_ascii_character_strings(MakeIndexSequence<128>());
VM::VM(OwnPtr<CustomData> custom_data)
: m_heap(*this)
, m_custom_data(move(custom_data))
{
m_empty_string = m_heap.allocate_without_realm<PrimitiveString>(String {});
for (size_t i = 0; i < 128; ++i) {
m_single_ascii_character_strings[i] = m_heap.allocate_without_realm<PrimitiveString>(DeprecatedString::formatted("{:c}", i));
}
for (size_t i = 0; i < single_ascii_character_strings.size(); ++i)
m_single_ascii_character_strings[i] = m_heap.allocate_without_realm<PrimitiveString>(single_ascii_character_strings[i]);
// Default hook implementations. These can be overridden by the host, for example, LibWeb overrides the default hooks to place promise jobs on the microtask queue.
host_promise_rejection_tracker = [this](Promise& promise, Promise::RejectionOperation operation) {