LCOV - app.info - js/src/v8-dtoa/conversions.cc

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: | 2012-04-21 | 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          280599 : char* DoubleToCString(double v, char* buffer, int buflen) {
          48          561198 :   StringBuilder builder(buffer, buflen);
          49                 :
          50          280599 :   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          258423 :       const int kV8DtoaBufferCapacity = kBase10MaximalLength + 1;
          73                 :       char v8_dtoa_buffer[kV8DtoaBufferCapacity];
          74                 :       int length;
          75                 :
          76          258423 :       if (DoubleToAscii(v, DTOA_SHORTEST, 0,
          77                 :                         Vector<char>(v8_dtoa_buffer, kV8DtoaBufferCapacity),
          78          258423 :                         &sign, &length, &decimal_point)) {
          79          244970 :         decimal_rep = v8_dtoa_buffer;
          80                 :       } else {
          81           13453 :         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          283477 :       if (sign) builder.AddCharacter('-');
          88                 :
          89          244970 :       if (length <= decimal_point && decimal_point <= 21) {
          90                 :         // ECMA-262 section 9.8.1 step 6.
          91           59423 :         builder.AddString(decimal_rep);
          92           59423 :         builder.AddPadding('0', decimal_point - length);
          93                 :
          94          185547 :       } else if (0 < decimal_point && decimal_point <= 21) {
          95                 :         // ECMA-262 section 9.8.1 step 7.
          96           39888 :         builder.AddSubstring(decimal_rep, decimal_point);
          97           39888 :         builder.AddCharacter('.');
          98           39888 :         builder.AddString(decimal_rep + decimal_point);
          99                 :
         100          145659 :       } else if (decimal_point <= 0 && decimal_point > -6) {
         101                 :         // ECMA-262 section 9.8.1 step 8.
         102           88059 :         builder.AddString("0.");
         103           88059 :         builder.AddPadding('0', -decimal_point);
         104           88059 :         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          267146 :   return builder.Finalize();
         129                 : }
         130                 :
         131                 : } }  // namespace v8::internal

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