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Bug 1880692, part 1 - Make StringBuilder::Unit::mLength specific to literals. r=smaug

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That is the only case that uses it. This might save a bit of space
and avoids some useless stores. Idea by peterv.

Differential Revision: https://phabricator.services.mozilla.com/D202344
This commit is contained in:
Andrew McCreight 2024-02-22 16:57:13 +00:00
parent 8dc5ebfd5f
commit 4e87a420eb
1 changed files with 11 additions and 11 deletions
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22
dom/base/nsContentUtils.cpp
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@ -9063,13 +9063,19 @@ class StringBuilder {
TextFragmentWithEncode,
};
struct LiteralSpan {
const char16_t* mData;
uint32_t mLength;
Span<const char16_t> AsSpan() { return Span(mData, mLength); }
};
union {
nsAtom* mAtom;
const char16_t* mLiteral;
LiteralSpan mLiteral;
nsString mString;
const nsTextFragment* mTextFragment;
};
uint32_t mLength = 0;
Type mType = Type::Unknown;
};
@ -9099,17 +9105,15 @@ class StringBuilder {
u->mAtom = aAtom;
u->mType = Unit::Type::Atom;
uint32_t len = aAtom->GetLength();
u->mLength = len;
mLength += len;
}
template <int N>
void Append(const char16_t (&aLiteral)[N]) {
constexpr uint32_t len = N - 1;
Unit* u = AddUnit();
u->mLiteral = aLiteral;
u->mLiteral = {aLiteral, len};
u->mType = Unit::Type::Literal;
uint32_t len = N - 1;
u->mLength = len;
mLength += len;
}
@ -9118,7 +9122,6 @@ class StringBuilder {
uint32_t len = aString.Length();
new (&u->mString) nsString(std::move(aString));
u->mType = Unit::Type::String;
u->mLength = len;
mLength += len;
}
@ -9126,7 +9129,6 @@ class StringBuilder {
Unit* u = AddUnit();
new (&u->mString) nsString(std::move(aString));
u->mType = Unit::Type::StringWithEncode;
u->mLength = aLen;
mLength += aLen;
}
@ -9135,7 +9137,6 @@ class StringBuilder {
u->mTextFragment = aTextFragment;
u->mType = Unit::Type::TextFragment;
uint32_t len = aTextFragment->GetLength();
u->mLength = len;
mLength += len;
}
@ -9143,7 +9144,6 @@ class StringBuilder {
Unit* u = AddUnit();
u->mTextFragment = aTextFragment;
u->mType = Unit::Type::TextFragmentWithEncode;
u->mLength = aLen;
mLength += aLen;
}
@ -9174,7 +9174,7 @@ class StringBuilder {
EncodeAttrString(u.mString, appender);
break;
case Unit::Type::Literal:
appender.Append(Span(u.mLiteral, u.mLength));
appender.Append(u.mLiteral.AsSpan());
break;
case Unit::Type::TextFragment:
if (u.mTextFragment->Is2b()) {