beenull/ladybird
1
0
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird.git synced 2024-11-29 11:00:29 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 7

LibJS: Optimize PropertyName and StringPrototype for size

Browse source 
We can reduce the amount of padding the compiler adds in order to
ensure data alignment of member variables by ordering the types in
a struct by size in decending order.

Found By PVS-Studio: https://pvs-studio.com/en/docs/warnings/v802/
This commit is contained in:
Brian Gianforcaro 2021-10-10 00:00:15 -07:00 committed by Andreas Kling
parent d347432a9e
commit 1b00ddf07e
Notes: sideshowbarker 2024-07-18 02:51:40 +09:00 
Author: https://github.com/bgianfo
Commit: https://github.com/SerenityOS/serenity/commit/1b00ddf07e9
Pull-request: https://github.com/SerenityOS/serenity/pull/10418
3 changed files with 9 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
Userland/Libraries/LibJS/Runtime/PropertyName.h
View file

@ -74,8 +74,8 @@ public:
}
PropertyName(FlyString string, StringMayBeNumber string_may_be_number = StringMayBeNumber::Yes)
: m_type(Type::String)
, m_string_may_be_number(string_may_be_number == StringMayBeNumber::Yes)
: m_string_may_be_number(string_may_be_number == StringMayBeNumber::Yes)
, m_type(Type::String)
, m_string(move(string))
{
VERIFY(!m_string.is_null());
@ -184,11 +184,11 @@ public:
}
private:
Type m_type { Type::Invalid };
bool m_string_may_be_number { true };
Type m_type { Type::Invalid };
u32 m_number { 0 };
FlyString m_string;
Symbol* m_symbol { nullptr };
u32 m_number { 0 };
};
struct PropertyNameTraits : public Traits<PropertyName> {

8
Userland/Libraries/LibJS/Runtime/StringPrototype.cpp
View file

@ -63,18 +63,18 @@ CodePoint code_point_at(Utf16View const& string, size_t position)
auto code_point = static_cast<u32>(first);
if (!Utf16View::is_high_surrogate(first) && !Utf16View::is_low_surrogate(first))
return { code_point, 1, false };
return { false, code_point, 1 };
if (Utf16View::is_low_surrogate(first) || (position + 1 == string.length_in_code_units()))
return { code_point, 1, true };
return { true, code_point, 1 };
auto second = string.code_unit_at(position + 1);
if (!Utf16View::is_low_surrogate(second))
return { code_point, 1, true };
return { true, code_point, 1 };
code_point = Utf16View::decode_surrogate_pair(first, second);
return { code_point, 2, false };
return { false, code_point, 2 };
}
// 6.1.4.1 StringIndexOf ( string, searchValue, fromIndex ), https://tc39.es/ecma262/#sec-stringindexof

2
Userland/Libraries/LibJS/Runtime/StringPrototype.h
View file

@ -11,9 +11,9 @@
namespace JS {
struct CodePoint {
bool is_unpaired_surrogate { false };
u32 code_point { 0 };
size_t code_unit_count { 0 };
bool is_unpaired_surrogate { false };
};
CodePoint code_point_at(Utf16View const& string, size_t position);