From c10527b7c36a0c1ad49faaec5e4ea3dbb4f78b6c Mon Sep 17 00:00:00 2001
From: Lars Knoll <lars.knoll@theqtcompany.com>
Date: Fri, 9 Jan 2015 13:56:47 +0100
Subject: [PATCH] Remove the StringType_UInt subtype

It's not really used, and doesn't optimise anything really.
Additionally get rid of some code duplication.

Change-Id: I6502512e6df58db2c0264ea43d91a23c7585427c
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
---
 src/qml/jsruntime/qv4string.cpp | 57 ++++++++++-------------------------------
 src/qml/jsruntime/qv4string_p.h |  7 ++---
 2 files changed, 17 insertions(+), 47 deletions(-)

diff --git a/src/qml/jsruntime/qv4string.cpp b/src/qml/jsruntime/qv4string.cpp
index 5275673..795a6df 100644
--- a/src/qml/jsruntime/qv4string.cpp
+++ b/src/qml/jsruntime/qv4string.cpp
@@ -43,9 +43,8 @@
 
 using namespace QV4;
 
-static uint toArrayIndex(const QChar *ch, const QChar *end, bool *ok)
+static uint toArrayIndex(const QChar *ch, const QChar *end)
 {
-    *ok = false;
     uint i = ch->unicode() - '0';
     if (i > 9)
         return UINT_MAX;
@@ -65,15 +64,13 @@ static uint toArrayIndex(const QChar *ch, const QChar *end, bool *ok)
         i = n;
         ++ch;
     }
-    *ok = true;
     return i;
 }
 
 #ifndef V4_BOOTSTRAP
 
-static uint toArrayIndex(const char *ch, const char *end, bool *ok)
+static uint toArrayIndex(const char *ch, const char *end)
 {
-    *ok = false;
     uint i = *ch - '0';
     if (i > 9)
         return UINT_MAX;
@@ -93,7 +90,6 @@ static uint toArrayIndex(const char *ch, const char *end, bool *ok)
         i = n;
         ++ch;
     }
-    *ok = true;
     return i;
 }
 
@@ -225,16 +221,7 @@ bool String::isEqualTo(Managed *t, Managed *o)
     if (!o->internalClass()->vtable->isString)
         return false;
 
-    String *that = static_cast<String *>(t);
-    String *other = static_cast<String *>(o);
-    if (that->hashValue() != other->hashValue())
-        return false;
-    if (that->identifier() && that->identifier() == other->identifier())
-        return true;
-    if (that->subtype() >= Heap::String::StringType_UInt && that->subtype() == other->subtype())
-        return true;
-
-    return that->toQString() == other->toQString();
+    return static_cast<String *>(t)->isEqualTo(static_cast<String *>(o));
 }
 
 
@@ -278,10 +265,10 @@ uint String::toUInt(bool *ok) const
 
     if (subtype() == Heap::String::StringType_Unknown)
         d()->createHashValue();
-    if (subtype() >= Heap::String::StringType_UInt)
+    if (subtype() == Heap::String::StringType_ArrayIndex)
         return d()->stringHash;
 
-    // ### this conversion shouldn't be required
+    // required for UINT_MAX or numbers starting with a leading 0
     double d = RuntimeHelpers::stringToNumber(toQString());
     uint l = (uint)d;
     if (d == l)
@@ -290,20 +277,6 @@ uint String::toUInt(bool *ok) const
     return UINT_MAX;
 }
 
-bool String::equals(String *other) const
-{
-    if (this == other)
-        return true;
-    if (hashValue() != other->hashValue())
-        return false;
-    if (identifier() && identifier() == other->identifier())
-        return true;
-    if (subtype() >= Heap::String::StringType_UInt && subtype() == other->subtype())
-        return true;
-
-    return toQString() == other->toQString();
-}
-
 void String::makeIdentifierImpl() const
 {
     if (d()->largestSubLength)
@@ -335,10 +308,9 @@ void Heap::String::createHashValue() const
     const QChar *end = ch + text->size;
 
     // array indices get their number as hash value
-    bool ok;
-    stringHash = ::toArrayIndex(ch, end, &ok);
-    if (ok) {
-        subtype = (stringHash == UINT_MAX) ? Heap::String::StringType_UInt : Heap::String::StringType_ArrayIndex;
+    stringHash = ::toArrayIndex(ch, end);
+    if (stringHash != UINT_MAX) {
+        subtype = Heap::String::StringType_ArrayIndex;
         return;
     }
 
@@ -380,9 +352,8 @@ uint String::createHashValue(const QChar *ch, int length)
     const QChar *end = ch + length;
 
     // array indices get their number as hash value
-    bool ok;
-    uint stringHash = ::toArrayIndex(ch, end, &ok);
-    if (ok)
+    uint stringHash = ::toArrayIndex(ch, end);
+    if (stringHash != UINT_MAX)
         return stringHash;
 
     uint h = 0xffffffff;
@@ -399,9 +370,8 @@ uint String::createHashValue(const char *ch, int length)
     const char *end = ch + length;
 
     // array indices get their number as hash value
-    bool ok;
-    uint stringHash = ::toArrayIndex(ch, end, &ok);
-    if (ok)
+    uint stringHash = ::toArrayIndex(ch, end);
+    if (stringHash != UINT_MAX)
         return stringHash;
 
     uint h = 0xffffffff;
@@ -424,7 +394,6 @@ uint String::getLength(const Managed *m)
 
 uint String::toArrayIndex(const QString &str)
 {
-    bool ok;
-    return ::toArrayIndex(str.constData(), str.constData() + str.length(), &ok);
+    return ::toArrayIndex(str.constData(), str.constData() + str.length());
 }
 
diff --git a/src/qml/jsruntime/qv4string_p.h b/src/qml/jsruntime/qv4string_p.h
index 86b8f2b..8c3030b 100644
--- a/src/qml/jsruntime/qv4string_p.h
+++ b/src/qml/jsruntime/qv4string_p.h
@@ -50,7 +50,6 @@ struct Q_QML_PRIVATE_EXPORT String : Base {
     enum StringType {
         StringType_Unknown,
         StringType_Regular,
-        StringType_UInt,
         StringType_ArrayIndex
     };
 
@@ -90,7 +89,7 @@ struct Q_QML_PRIVATE_EXPORT String : Base {
         Q_ASSERT(!largestSubLength);
         if (identifier && identifier == other->identifier)
             return true;
-        if (subtype >= Heap::String::StringType_UInt && subtype == other->subtype)
+        if (subtype == Heap::String::StringType_ArrayIndex && other->subtype == Heap::String::StringType_ArrayIndex)
             return true;
 
         return toQString() == other->toQString();
@@ -124,7 +123,9 @@ struct Q_QML_PRIVATE_EXPORT String : public Managed {
         IsString = true
     };
 
-    bool equals(String *other) const;
+    bool equals(String *other) const {
+        return d()->isEqualTo(other->d());
+    }
     inline bool isEqualTo(const String *other) const {
         return d()->isEqualTo(other->d());
     }
-- 
2.7.4