update V8 to r5532 as required by WebKit r68651
Change-Id: I5f75eeffbf64b30dd5080348528d277f293490ad
diff --git a/src/fast-dtoa.h b/src/fast-dtoa.h
index 4403a75..94c22ec 100644
--- a/src/fast-dtoa.h
+++ b/src/fast-dtoa.h
@@ -31,27 +31,52 @@
namespace v8 {
namespace internal {
+enum FastDtoaMode {
+ // Computes the shortest representation of the given input. The returned
+ // result will be the most accurate number of this length. Longer
+ // representations might be more accurate.
+ FAST_DTOA_SHORTEST,
+ // Computes a representation where the precision (number of digits) is
+ // given as input. The precision is independent of the decimal point.
+ FAST_DTOA_PRECISION
+};
+
// FastDtoa will produce at most kFastDtoaMaximalLength digits. This does not
// include the terminating '\0' character.
static const int kFastDtoaMaximalLength = 17;
// Provides a decimal representation of v.
-// v must be a strictly positive finite double.
+// The result should be interpreted as buffer * 10^(point - length).
+//
+// Precondition:
+// * v must be a strictly positive finite double.
+//
// Returns true if it succeeds, otherwise the result can not be trusted.
// There will be *length digits inside the buffer followed by a null terminator.
-// If the function returns true then
-// v == (double) (buffer * 10^(point - length)).
-// The digits in the buffer are the shortest representation possible: no
-// 0.099999999999 instead of 0.1.
-// The last digit will be closest to the actual v. That is, even if several
-// digits might correctly yield 'v' when read again, the buffer will contain the
-// one closest to v.
-// The variable 'sign' will be '0' if the given number is positive, and '1'
-// otherwise.
+// If the function returns true and mode equals
+// - FAST_DTOA_SHORTEST, then
+// the parameter requested_digits is ignored.
+// The result satisfies
+// v == (double) (buffer * 10^(point - length)).
+// The digits in the buffer are the shortest representation possible. E.g.
+// if 0.099999999999 and 0.1 represent the same double then "1" is returned
+// with point = 0.
+// The last digit will be closest to the actual v. That is, even if several
+// digits might correctly yield 'v' when read again, the buffer will contain
+// the one closest to v.
+// - FAST_DTOA_PRECISION, then
+// the buffer contains requested_digits digits.
+// the difference v - (buffer * 10^(point-length)) is closest to zero for
+// all possible representations of requested_digits digits.
+// If there are two values that are equally close, then FastDtoa returns
+// false.
+// For both modes the buffer must be large enough to hold the result.
bool FastDtoa(double d,
+ FastDtoaMode mode,
+ int requested_digits,
Vector<char> buffer,
int* length,
- int* point);
+ int* decimal_point);
} } // namespace v8::internal