JavaScriptCore-903.tar.gz

[apple/javascriptcore.git] / runtime / JSValue.cpp

diff --git a/runtime/JSValue.cpp b/runtime/JSValue.cpp
index f549bff5da6695fb3cb469b9bfcbb6d549e4c45a..d3ee89ea86b75d9bb7714110b5084488aa7a060f 100644 (file)
--- a/runtime/JSValue.cpp
+++ b/runtime/JSValue.cpp
@@ -23,65 +23,175 @@
 #include "config.h"
 #include "JSValue.h"
 
 #include "config.h"
 #include "JSValue.h"
 

+#include "BooleanConstructor.h"
+#include "BooleanPrototype.h"
+#include "Error.h"
+#include "ExceptionHelpers.h"
+#include "JSGlobalObject.h"

 #include "JSFunction.h"
 #include "JSFunction.h"

+#include "JSNotAnObject.h"
+#include "NumberObject.h"

 #include <wtf/MathExtras.h>
 #include <wtf/MathExtras.h>

+#include <wtf/StringExtras.h>

 
 namespace JSC {
 
 static const double D32 = 4294967296.0;
 
 // ECMA 9.4
 
 namespace JSC {
 
 static const double D32 = 4294967296.0;
 
 // ECMA 9.4

-double JSValuePtr::toInteger(ExecState* exec) const
+double JSValue::toInteger(ExecState* exec) const

 {
 {

-    if (isInt32Fast())
-        return getInt32Fast();
+    if (isInt32())
+        return asInt32();

     double d = toNumber(exec);
     return isnan(d) ? 0.0 : trunc(d);
 }
 
     double d = toNumber(exec);
     return isnan(d) ? 0.0 : trunc(d);
 }
 

-double JSValuePtr::toIntegerPreserveNaN(ExecState* exec) const
+double JSValue::toIntegerPreserveNaN(ExecState* exec) const

 {
 {

-    if (isInt32Fast())
-        return getInt32Fast();
+    if (isInt32())
+        return asInt32();

     return trunc(toNumber(exec));
 }
 
     return trunc(toNumber(exec));
 }
 

-int32_t toInt32SlowCase(double d, bool& ok)
+JSObject* JSValue::toObjectSlowCase(ExecState* exec, JSGlobalObject* globalObject) const

 {
 {

-    ok = true;
+    ASSERT(!isCell());

 
 

-    if (d >= -D32 / 2 && d < D32 / 2)
-        return static_cast<int32_t>(d);
+    if (isInt32() || isDouble())
+        return constructNumber(exec, globalObject, asValue());
+    if (isTrue() || isFalse())
+        return constructBooleanFromImmediateBoolean(exec, globalObject, asValue());

 
 

-    if (isnan(d) || isinf(d)) {
-        ok = false;
-        return 0;
-    }
+    ASSERT(isUndefinedOrNull());
+    throwError(exec, createNotAnObjectError(exec, *this));
+    return new (exec) JSNotAnObject(exec);
+}
+
+JSObject* JSValue::toThisObjectSlowCase(ExecState* exec) const
+{
+    ASSERT(!isCell());
+
+    if (isInt32() || isDouble())
+        return constructNumber(exec, exec->lexicalGlobalObject(), asValue());
+    if (isTrue() || isFalse())
+        return constructBooleanFromImmediateBoolean(exec, exec->lexicalGlobalObject(), asValue());
+    ASSERT(isUndefinedOrNull());
+    return exec->globalThisValue();
+}
+
+JSObject* JSValue::synthesizeObject(ExecState* exec) const
+{
+    ASSERT(!isCell());
+    if (isNumber())
+        return constructNumber(exec, exec->lexicalGlobalObject(), asValue());
+    if (isBoolean())
+        return constructBooleanFromImmediateBoolean(exec, exec->lexicalGlobalObject(), asValue());
+
+    ASSERT(isUndefinedOrNull());
+    throwError(exec, createNotAnObjectError(exec, *this));
+    return new (exec) JSNotAnObject(exec);
+}
+
+JSObject* JSValue::synthesizePrototype(ExecState* exec) const
+{
+    ASSERT(!isCell());
+    if (isNumber())
+        return exec->lexicalGlobalObject()->numberPrototype();
+    if (isBoolean())
+        return exec->lexicalGlobalObject()->booleanPrototype();

 
 

-    double d32 = fmod(trunc(d), D32);
-    if (d32 >= D32 / 2)
-        d32 -= D32;
-    else if (d32 < -D32 / 2)
-        d32 += D32;
-    return static_cast<int32_t>(d32);
+    ASSERT(isUndefinedOrNull());
+    throwError(exec, createNotAnObjectError(exec, *this));
+    return new (exec) JSNotAnObject(exec);

 }
 
 }
 

-uint32_t toUInt32SlowCase(double d, bool& ok)
+#ifndef NDEBUG
+char* JSValue::description()

 {
 {

-    ok = true;
+    static const size_t size = 32;
+    static char description[size];

 
 

-    if (d >= 0.0 && d < D32)
-        return static_cast<uint32_t>(d);
+    if (!*this)
+        snprintf(description, size, "<JSValue()>");
+    else if (isInt32())
+        snprintf(description, size, "Int32: %d", asInt32());
+    else if (isDouble())
+        snprintf(description, size, "Double: %lf", asDouble());
+    else if (isCell())
+        snprintf(description, size, "Cell: %p", asCell());
+    else if (isTrue())
+        snprintf(description, size, "True");
+    else if (isFalse())
+        snprintf(description, size, "False");
+    else if (isNull())
+        snprintf(description, size, "Null");
+    else if (isUndefined())
+        snprintf(description, size, "Undefined");
+    else
+        snprintf(description, size, "INVALID");

 
 

-    if (isnan(d) || isinf(d)) {
-        ok = false;
+    return description;
+}
+#endif
+
+// This in the ToInt32 operation is defined in section 9.5 of the ECMA-262 spec.
+// Note that this operation is identical to ToUInt32 other than to interpretation
+// of the resulting bit-pattern (as such this metod is also called to implement
+// ToUInt32).
+//
+// The operation can be descibed as round towards zero, then select the 32 least
+// bits of the resulting value in 2s-complement representation.
+int32_t toInt32(double number)
+{
+    int64_t bits = WTF::bitwise_cast<int64_t>(number);
+    int32_t exp = (static_cast<int32_t>(bits >> 52) & 0x7ff) - 0x3ff;
+
+    // If exponent < 0 there will be no bits to the left of the decimal point
+    // after rounding; if the exponent is > 83 then no bits of precision can be
+    // left in the low 32-bit range of the result (IEEE-754 doubles have 52 bits
+    // of fractional precision).
+    // Note this case handles 0, -0, and all infinte, NaN, & denormal value. 
+    if (exp < 0 || exp > 83)

         return 0;
         return 0;

+
+    // Select the appropriate 32-bits from the floating point mantissa.  If the
+    // exponent is 52 then the bits we need to select are already aligned to the
+    // lowest bits of the 64-bit integer representation of tghe number, no need
+    // to shift.  If the exponent is greater than 52 we need to shift the value
+    // left by (exp - 52), if the value is less than 52 we need to shift right
+    // accordingly.
+    int32_t result = (exp > 52)
+        ? static_cast<int32_t>(bits << (exp - 52))
+        : static_cast<int32_t>(bits >> (52 - exp));
+
+    // IEEE-754 double precision values are stored omitting an implicit 1 before
+    // the decimal point; we need to reinsert this now.  We may also the shifted
+    // invalid bits into the result that are not a part of the mantissa (the sign
+    // and exponent bits from the floatingpoint representation); mask these out.
+    if (exp < 32) {
+        int32_t missingOne = 1 << exp;
+        result &= missingOne - 1;
+        result += missingOne;

     }
 
     }
 

-    double d32 = fmod(trunc(d), D32);
-    if (d32 < 0)
-        d32 += D32;
-    return static_cast<uint32_t>(d32);
+    // If the input value was negative (we could test either 'number' or 'bits',
+    // but testing 'bits' is likely faster) invert the result appropriately.
+    return bits < 0 ? -result : result;
+}
+
+NEVER_INLINE double nonInlineNaN()
+{
+#if OS(SYMBIAN)
+    return nanval();
+#else
+    return std::numeric_limits<double>::quiet_NaN();
+#endif
+}
+
+bool JSValue::isValidCallee()
+{
+    return asObject(asObject(asCell())->getAnonymousValue(0))->isGlobalObject();

 }
 
 } // namespace JSC
 }
 
 } // namespace JSC