LCOV - code coverage report
Current view: directory - js/src/v8-dtoa - conversions.cc (source / functions) Found Hit Coverage
Test: app.info Lines: 38 38 100.0 %
Date: 2012-06-02 Functions: 1 1 100.0 %

       1                 : // Copyright 2006-2008 the V8 project authors. All rights reserved.
       2                 : // Redistribution and use in source and binary forms, with or without
       3                 : // modification, are permitted provided that the following conditions are
       4                 : // met:
       5                 : //
       6                 : //     * Redistributions of source code must retain the above copyright
       7                 : //       notice, this list of conditions and the following disclaimer.
       8                 : //     * Redistributions in binary form must reproduce the above
       9                 : //       copyright notice, this list of conditions and the following
      10                 : //       disclaimer in the documentation and/or other materials provided
      11                 : //       with the distribution.
      12                 : //     * Neither the name of Google Inc. nor the names of its
      13                 : //       contributors may be used to endorse or promote products derived
      14                 : //       from this software without specific prior written permission.
      15                 : //
      16                 : // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      17                 : // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      18                 : // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      19                 : // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      20                 : // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      21                 : // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      22                 : // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      23                 : // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      24                 : // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      25                 : // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      26                 : // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      27                 : 
      28                 : #include <math.h>
      29                 : 
      30                 : #include "v8.h"
      31                 : #include "dtoa.h"
      32                 : 
      33                 : namespace v8 {
      34                 : namespace internal {
      35                 : 
      36                 : // MOZ: The return type was changed from 'const char*' to 'char*' to match the
      37                 : // usage within SpiderMonkey.
      38                 : //
      39                 : // MOZ: The arguments were modified to use a char buffer instead of
      40                 : // v8::internal::Vector, to save SpiderMonkey from having to know about that
      41                 : // type.
      42                 : //
      43                 : // MOZ: The function was modified to return NULL when it needs to fall back to
      44                 : // Gay's dtoa, rather than calling Gay's dtoa itself.  That's because
      45                 : // SpiderMonkey already has its own copy of Gay's dtoa.
      46                 : //
      47          279511 : char* DoubleToCString(double v, char* buffer, int buflen) {
      48          559022 :   StringBuilder builder(buffer, buflen);
      49                 : 
      50          279511 :   switch (fpclassify(v)) {
      51                 :     case FP_NAN:
      52           11272 :       builder.AddString("NaN");
      53           11272 :       break;
      54                 : 
      55                 :     case FP_INFINITE:
      56           10813 :       if (v < 0.0) {
      57            5345 :         builder.AddString("-Infinity");
      58                 :       } else {
      59            5468 :         builder.AddString("Infinity");
      60                 :       }
      61           10813 :       break;
      62                 : 
      63                 :     case FP_ZERO:
      64              91 :       builder.AddCharacter('0');
      65              91 :       break;
      66                 : 
      67                 :     default: {
      68                 :       int decimal_point;
      69                 :       int sign;
      70                 :       char* decimal_rep;
      71                 :       //bool used_gay_dtoa = false;     MOZ: see above
      72          257335 :       const int kV8DtoaBufferCapacity = kBase10MaximalLength + 1;
      73                 :       char v8_dtoa_buffer[kV8DtoaBufferCapacity];
      74                 :       int length;
      75                 : 
      76          257335 :       if (DoubleToAscii(v, DTOA_SHORTEST, 0,
      77                 :                         Vector<char>(v8_dtoa_buffer, kV8DtoaBufferCapacity),
      78          257335 :                         &sign, &length, &decimal_point)) {
      79          243881 :         decimal_rep = v8_dtoa_buffer;
      80                 :       } else {
      81           13454 :         return NULL;    // MOZ: see above
      82                 :         //decimal_rep = dtoa(v, 0, 0, &decimal_point, &sign, NULL);
      83                 :         //used_gay_dtoa = true;
      84                 :         //length = StrLength(decimal_rep);
      85                 :       }
      86                 : 
      87          282388 :       if (sign) builder.AddCharacter('-');
      88                 : 
      89          243881 :       if (length <= decimal_point && decimal_point <= 21) {
      90                 :         // ECMA-262 section 9.8.1 step 6.
      91           58393 :         builder.AddString(decimal_rep);
      92           58393 :         builder.AddPadding('0', decimal_point - length);
      93                 : 
      94          185488 :       } else if (0 < decimal_point && decimal_point <= 21) {
      95                 :         // ECMA-262 section 9.8.1 step 7.
      96           39814 :         builder.AddSubstring(decimal_rep, decimal_point);
      97           39814 :         builder.AddCharacter('.');
      98           39814 :         builder.AddString(decimal_rep + decimal_point);
      99                 : 
     100          145674 :       } else if (decimal_point <= 0 && decimal_point > -6) {
     101                 :         // ECMA-262 section 9.8.1 step 8.
     102           88074 :         builder.AddString("0.");
     103           88074 :         builder.AddPadding('0', -decimal_point);
     104           88074 :         builder.AddString(decimal_rep);
     105                 : 
     106                 :       } else {
     107                 :         // ECMA-262 section 9.8.1 step 9 and 10 combined.
     108           57600 :         builder.AddCharacter(decimal_rep[0]);
     109           57600 :         if (length != 1) {
     110           57070 :           builder.AddCharacter('.');
     111           57070 :           builder.AddString(decimal_rep + 1);
     112                 :         }
     113           57600 :         builder.AddCharacter('e');
     114           57600 :         builder.AddCharacter((decimal_point >= 0) ? '+' : '-');
     115           57600 :         int exponent = decimal_point - 1;
     116           57600 :         if (exponent < 0) exponent = -exponent;
     117                 :         // MOZ: This was a call to 'AddFormatted("%d", exponent)', which
     118                 :         // called onto vsnprintf().  Because this was the only call to
     119                 :         // AddFormatted in the imported code, it was replaced with this call
     120                 :         // to AddInteger, which is faster and doesn't require any
     121                 :         // platform-specific code.
     122           57600 :         builder.AddInteger(exponent);
     123                 :       }
     124                 : 
     125                 :       //if (used_gay_dtoa) freedtoa(decimal_rep);   MOZ: see above
     126                 :     }
     127                 :   }
     128          266057 :   return builder.Finalize();
     129                 : }
     130                 : 
     131                 : } }  // namespace v8::internal

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