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https://repo.dactyloidae.xyz/Dactyloidae/UXP.git
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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo
This commit is contained in:
Roy Tam
commit
dcd9973243
150858 changed files with 23884658 additions and 0 deletions
527
js/src/jsdtoa.cpp
Normal file
527
js/src/jsdtoa.cpp
Normal file
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|
@ -0,0 +1,527 @@
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|||
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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||||
* vim: set ts=8 sts=4 et sw=4 tw=99:
|
||||
* This Source Code Form is subject to the terms of the Mozilla Public
|
||||
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
||||
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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||||
|
||||
/*
|
||||
* Portable double to alphanumeric string and back converters.
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*/
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||||
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#include "jsdtoa.h"
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|
||||
#include "jsprf.h"
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#include "jstypes.h"
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#include "jsutil.h"
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|
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using namespace js;
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||||
|
||||
#if MOZ_LITTLE_ENDIAN
|
||||
#define IEEE_8087
|
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#else
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#define IEEE_MC68k
|
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#endif
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||||
|
||||
#ifndef Long
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||||
#define Long int32_t
|
||||
#endif
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||||
|
||||
#ifndef ULong
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||||
#define ULong uint32_t
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||||
#endif
|
||||
|
||||
/*
|
||||
#ifndef Llong
|
||||
#define Llong int64_t
|
||||
#endif
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||||
|
||||
#ifndef ULlong
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||||
#define ULlong uint64_t
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||||
#endif
|
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*/
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||||
|
||||
// dtoa.c requires that MALLOC be infallible. Furthermore, its allocations are
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// few and small. So AutoEnterOOMUnsafeRegion is appropriate here.
|
||||
static inline void* dtoa_malloc(size_t size)
|
||||
{
|
||||
AutoEnterOOMUnsafeRegion oomUnsafe;
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||||
void* p = js_malloc(size);
|
||||
if (!p)
|
||||
oomUnsafe.crash("dtoa_malloc");
|
||||
|
||||
return p;
|
||||
}
|
||||
|
||||
static inline void dtoa_free(void* p)
|
||||
{
|
||||
return js_free(p);
|
||||
}
|
||||
|
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#define NO_GLOBAL_STATE
|
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#define NO_ERRNO
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#define Omit_Private_Memory // This saves memory for the workloads we see.
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||||
#define MALLOC dtoa_malloc
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#define FREE dtoa_free
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#include "dtoa.c"
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|
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/* Mapping of JSDToStrMode -> js_dtoa mode */
|
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static const uint8_t dtoaModes[] = {
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0, /* DTOSTR_STANDARD */
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0, /* DTOSTR_STANDARD_EXPONENTIAL, */
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3, /* DTOSTR_FIXED, */
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2, /* DTOSTR_EXPONENTIAL, */
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2}; /* DTOSTR_PRECISION */
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||||
|
||||
double
|
||||
js_strtod_harder(DtoaState* state, const char* s00, char** se, int* err)
|
||||
{
|
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double retval;
|
||||
if (err)
|
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*err = 0;
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||||
retval = _strtod(state, s00, se);
|
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return retval;
|
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}
|
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|
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char*
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js_dtostr(DtoaState* state, char* buffer, size_t bufferSize, JSDToStrMode mode, int precision,
|
||||
double dinput)
|
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{
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U d;
|
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int decPt; /* Offset of decimal point from first digit */
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int sign; /* Nonzero if the sign bit was set in d */
|
||||
int nDigits; /* Number of significand digits returned by js_dtoa */
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char* numBegin; /* Pointer to the digits returned by js_dtoa */
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char* numEnd = 0; /* Pointer past the digits returned by js_dtoa */
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|
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MOZ_ASSERT(bufferSize >= (size_t)(mode <= DTOSTR_STANDARD_EXPONENTIAL
|
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? DTOSTR_STANDARD_BUFFER_SIZE
|
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: DTOSTR_VARIABLE_BUFFER_SIZE(precision)));
|
||||
|
||||
/*
|
||||
* Change mode here rather than below because the buffer may not be large
|
||||
* enough to hold a large integer.
|
||||
*/
|
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if (mode == DTOSTR_FIXED && (dinput >= 1e21 || dinput <= -1e21))
|
||||
mode = DTOSTR_STANDARD;
|
||||
|
||||
dval(d) = dinput;
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||||
numBegin = dtoa(PASS_STATE d, dtoaModes[mode], precision, &decPt, &sign, &numEnd);
|
||||
if (!numBegin) {
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
nDigits = numEnd - numBegin;
|
||||
MOZ_ASSERT((size_t) nDigits <= bufferSize - 2);
|
||||
if ((size_t) nDigits > bufferSize - 2) {
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
js_memcpy(buffer + 2, numBegin, nDigits);
|
||||
freedtoa(PASS_STATE numBegin);
|
||||
numBegin = buffer + 2; /* +2 leaves space for sign and/or decimal point */
|
||||
numEnd = numBegin + nDigits;
|
||||
*numEnd = '\0';
|
||||
|
||||
/* If Infinity, -Infinity, or NaN, return the string regardless of mode. */
|
||||
if (decPt != 9999) {
|
||||
bool exponentialNotation = false;
|
||||
int minNDigits = 0; /* Min number of significant digits required */
|
||||
char* p;
|
||||
char* q;
|
||||
|
||||
switch (mode) {
|
||||
case DTOSTR_STANDARD:
|
||||
if (decPt < -5 || decPt > 21)
|
||||
exponentialNotation = true;
|
||||
else
|
||||
minNDigits = decPt;
|
||||
break;
|
||||
|
||||
case DTOSTR_FIXED:
|
||||
if (precision >= 0)
|
||||
minNDigits = decPt + precision;
|
||||
else
|
||||
minNDigits = decPt;
|
||||
break;
|
||||
|
||||
case DTOSTR_EXPONENTIAL:
|
||||
MOZ_ASSERT(precision > 0);
|
||||
minNDigits = precision;
|
||||
MOZ_FALLTHROUGH;
|
||||
case DTOSTR_STANDARD_EXPONENTIAL:
|
||||
exponentialNotation = true;
|
||||
break;
|
||||
|
||||
case DTOSTR_PRECISION:
|
||||
MOZ_ASSERT(precision > 0);
|
||||
minNDigits = precision;
|
||||
if (decPt < -5 || decPt > precision)
|
||||
exponentialNotation = true;
|
||||
break;
|
||||
}
|
||||
|
||||
/* If the number has fewer than minNDigits, end-pad it with zeros. */
|
||||
if (nDigits < minNDigits) {
|
||||
p = numBegin + minNDigits;
|
||||
nDigits = minNDigits;
|
||||
do {
|
||||
*numEnd++ = '0';
|
||||
} while (numEnd != p);
|
||||
*numEnd = '\0';
|
||||
}
|
||||
|
||||
if (exponentialNotation) {
|
||||
/* Insert a decimal point if more than one significand digit */
|
||||
if (nDigits != 1) {
|
||||
numBegin--;
|
||||
numBegin[0] = numBegin[1];
|
||||
numBegin[1] = '.';
|
||||
}
|
||||
snprintf(numEnd, bufferSize - (numEnd - buffer), "e%+d", decPt-1);
|
||||
} else if (decPt != nDigits) {
|
||||
/* Some kind of a fraction in fixed notation */
|
||||
MOZ_ASSERT(decPt <= nDigits);
|
||||
if (decPt > 0) {
|
||||
/* dd...dd . dd...dd */
|
||||
p = --numBegin;
|
||||
do {
|
||||
*p = p[1];
|
||||
p++;
|
||||
} while (--decPt);
|
||||
*p = '.';
|
||||
} else {
|
||||
/* 0 . 00...00dd...dd */
|
||||
p = numEnd;
|
||||
numEnd += 1 - decPt;
|
||||
q = numEnd;
|
||||
MOZ_ASSERT(numEnd < buffer + bufferSize);
|
||||
*numEnd = '\0';
|
||||
while (p != numBegin)
|
||||
*--q = *--p;
|
||||
for (p = numBegin + 1; p != q; p++)
|
||||
*p = '0';
|
||||
*numBegin = '.';
|
||||
*--numBegin = '0';
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* If negative and neither -0.0 nor NaN, output a leading '-'. */
|
||||
if (sign &&
|
||||
!(word0(d) == Sign_bit && word1(d) == 0) &&
|
||||
!((word0(d) & Exp_mask) == Exp_mask &&
|
||||
(word1(d) || (word0(d) & Frac_mask)))) {
|
||||
*--numBegin = '-';
|
||||
}
|
||||
return numBegin;
|
||||
}
|
||||
|
||||
|
||||
/* Let b = floor(b / divisor), and return the remainder. b must be nonnegative.
|
||||
* divisor must be between 1 and 65536.
|
||||
* This function cannot run out of memory. */
|
||||
static uint32_t
|
||||
divrem(Bigint* b, uint32_t divisor)
|
||||
{
|
||||
int32_t n = b->wds;
|
||||
uint32_t remainder = 0;
|
||||
ULong* bx;
|
||||
ULong* bp;
|
||||
|
||||
MOZ_ASSERT(divisor > 0 && divisor <= 65536);
|
||||
|
||||
if (!n)
|
||||
return 0; /* b is zero */
|
||||
bx = b->x;
|
||||
bp = bx + n;
|
||||
do {
|
||||
ULong a = *--bp;
|
||||
ULong dividend = remainder << 16 | a >> 16;
|
||||
ULong quotientHi = dividend / divisor;
|
||||
ULong quotientLo;
|
||||
|
||||
remainder = dividend - quotientHi*divisor;
|
||||
MOZ_ASSERT(quotientHi <= 0xFFFF && remainder < divisor);
|
||||
dividend = remainder << 16 | (a & 0xFFFF);
|
||||
quotientLo = dividend / divisor;
|
||||
remainder = dividend - quotientLo*divisor;
|
||||
MOZ_ASSERT(quotientLo <= 0xFFFF && remainder < divisor);
|
||||
*bp = quotientHi << 16 | quotientLo;
|
||||
} while (bp != bx);
|
||||
/* Decrease the size of the number if its most significant word is now zero. */
|
||||
if (bx[n-1] == 0)
|
||||
b->wds--;
|
||||
return remainder;
|
||||
}
|
||||
|
||||
/* Return floor(b/2^k) and set b to be the remainder. The returned quotient must be less than 2^32. */
|
||||
static uint32_t quorem2(Bigint* b, int32_t k)
|
||||
{
|
||||
ULong mask;
|
||||
ULong result;
|
||||
ULong* bx;
|
||||
ULong* bxe;
|
||||
int32_t w;
|
||||
int32_t n = k >> 5;
|
||||
k &= 0x1F;
|
||||
mask = (1<<k) - 1;
|
||||
|
||||
w = b->wds - n;
|
||||
if (w <= 0)
|
||||
return 0;
|
||||
MOZ_ASSERT(w <= 2);
|
||||
bx = b->x;
|
||||
bxe = bx + n;
|
||||
result = *bxe >> k;
|
||||
*bxe &= mask;
|
||||
if (w == 2) {
|
||||
MOZ_ASSERT(!(bxe[1] & ~mask));
|
||||
if (k)
|
||||
result |= bxe[1] << (32 - k);
|
||||
}
|
||||
n++;
|
||||
while (!*bxe && bxe != bx) {
|
||||
n--;
|
||||
bxe--;
|
||||
}
|
||||
b->wds = n;
|
||||
return result;
|
||||
}
|
||||
|
||||
|
||||
/* "-0.0000...(1073 zeros after decimal point)...0001\0" is the longest string that we could produce,
|
||||
* which occurs when printing -5e-324 in binary. We could compute a better estimate of the size of
|
||||
* the output string and malloc fewer bytes depending on d and base, but why bother? */
|
||||
#define DTOBASESTR_BUFFER_SIZE 1078
|
||||
#define BASEDIGIT(digit) ((char)(((digit) >= 10) ? 'a' - 10 + (digit) : '0' + (digit)))
|
||||
|
||||
char*
|
||||
js_dtobasestr(DtoaState* state, int base, double dinput)
|
||||
{
|
||||
U d;
|
||||
char* buffer; /* The output string */
|
||||
char* p; /* Pointer to current position in the buffer */
|
||||
char* pInt; /* Pointer to the beginning of the integer part of the string */
|
||||
char* q;
|
||||
uint32_t digit;
|
||||
U di; /* d truncated to an integer */
|
||||
U df; /* The fractional part of d */
|
||||
|
||||
MOZ_ASSERT(base >= 2 && base <= 36);
|
||||
|
||||
dval(d) = dinput;
|
||||
buffer = (char*) js_malloc(DTOBASESTR_BUFFER_SIZE);
|
||||
if (!buffer)
|
||||
return nullptr;
|
||||
p = buffer;
|
||||
|
||||
if (dval(d) < 0.0
|
||||
#if defined(XP_WIN)
|
||||
&& !((word0(d) & Exp_mask) == Exp_mask && ((word0(d) & Frac_mask) || word1(d))) /* Visual C++ doesn't know how to compare against NaN */
|
||||
#endif
|
||||
) {
|
||||
*p++ = '-';
|
||||
dval(d) = -dval(d);
|
||||
}
|
||||
|
||||
/* Check for Infinity and NaN */
|
||||
if ((word0(d) & Exp_mask) == Exp_mask) {
|
||||
strcpy(p, !word1(d) && !(word0(d) & Frac_mask) ? "Infinity" : "NaN");
|
||||
return buffer;
|
||||
}
|
||||
|
||||
/* Output the integer part of d with the digits in reverse order. */
|
||||
pInt = p;
|
||||
dval(di) = floor(dval(d));
|
||||
if (dval(di) <= 4294967295.0) {
|
||||
uint32_t n = (uint32_t)dval(di);
|
||||
if (n)
|
||||
do {
|
||||
uint32_t m = n / base;
|
||||
digit = n - m*base;
|
||||
n = m;
|
||||
MOZ_ASSERT(digit < (uint32_t)base);
|
||||
*p++ = BASEDIGIT(digit);
|
||||
} while (n);
|
||||
else *p++ = '0';
|
||||
} else {
|
||||
int e;
|
||||
int bits; /* Number of significant bits in di; not used. */
|
||||
Bigint* b = d2b(PASS_STATE di, &e, &bits);
|
||||
if (!b)
|
||||
goto nomem1;
|
||||
b = lshift(PASS_STATE b, e);
|
||||
if (!b) {
|
||||
nomem1:
|
||||
Bfree(PASS_STATE b);
|
||||
js_free(buffer);
|
||||
return nullptr;
|
||||
}
|
||||
do {
|
||||
digit = divrem(b, base);
|
||||
MOZ_ASSERT(digit < (uint32_t)base);
|
||||
*p++ = BASEDIGIT(digit);
|
||||
} while (b->wds);
|
||||
Bfree(PASS_STATE b);
|
||||
}
|
||||
/* Reverse the digits of the integer part of d. */
|
||||
q = p-1;
|
||||
while (q > pInt) {
|
||||
char ch = *pInt;
|
||||
*pInt++ = *q;
|
||||
*q-- = ch;
|
||||
}
|
||||
|
||||
dval(df) = dval(d) - dval(di);
|
||||
if (dval(df) != 0.0) {
|
||||
/* We have a fraction. */
|
||||
int e, bbits;
|
||||
int32_t s2, done;
|
||||
Bigint* b = nullptr;
|
||||
Bigint* s = nullptr;
|
||||
Bigint* mlo = nullptr;
|
||||
Bigint* mhi = nullptr;
|
||||
|
||||
*p++ = '.';
|
||||
b = d2b(PASS_STATE df, &e, &bbits);
|
||||
if (!b) {
|
||||
nomem2:
|
||||
Bfree(PASS_STATE b);
|
||||
Bfree(PASS_STATE s);
|
||||
if (mlo != mhi)
|
||||
Bfree(PASS_STATE mlo);
|
||||
Bfree(PASS_STATE mhi);
|
||||
js_free(buffer);
|
||||
return nullptr;
|
||||
}
|
||||
MOZ_ASSERT(e < 0);
|
||||
/* At this point df = b * 2^e. e must be less than zero because 0 < df < 1. */
|
||||
|
||||
s2 = -(int32_t)(word0(d) >> Exp_shift1 & Exp_mask>>Exp_shift1);
|
||||
#ifndef Sudden_Underflow
|
||||
if (!s2)
|
||||
s2 = -1;
|
||||
#endif
|
||||
s2 += Bias + P;
|
||||
/* 1/2^s2 = (nextDouble(d) - d)/2 */
|
||||
MOZ_ASSERT(-s2 < e);
|
||||
mlo = i2b(PASS_STATE 1);
|
||||
if (!mlo)
|
||||
goto nomem2;
|
||||
mhi = mlo;
|
||||
if (!word1(d) && !(word0(d) & Bndry_mask)
|
||||
#ifndef Sudden_Underflow
|
||||
&& word0(d) & (Exp_mask & Exp_mask << 1)
|
||||
#endif
|
||||
) {
|
||||
/* The special case. Here we want to be within a quarter of the last input
|
||||
significant digit instead of one half of it when the output string's value is less than d. */
|
||||
s2 += Log2P;
|
||||
mhi = i2b(PASS_STATE 1<<Log2P);
|
||||
if (!mhi)
|
||||
goto nomem2;
|
||||
}
|
||||
b = lshift(PASS_STATE b, e + s2);
|
||||
if (!b)
|
||||
goto nomem2;
|
||||
s = i2b(PASS_STATE 1);
|
||||
if (!s)
|
||||
goto nomem2;
|
||||
s = lshift(PASS_STATE s, s2);
|
||||
if (!s)
|
||||
goto nomem2;
|
||||
/* At this point we have the following:
|
||||
* s = 2^s2;
|
||||
* 1 > df = b/2^s2 > 0;
|
||||
* (d - prevDouble(d))/2 = mlo/2^s2;
|
||||
* (nextDouble(d) - d)/2 = mhi/2^s2. */
|
||||
|
||||
done = false;
|
||||
do {
|
||||
int32_t j, j1;
|
||||
Bigint* delta;
|
||||
|
||||
b = multadd(PASS_STATE b, base, 0);
|
||||
if (!b)
|
||||
goto nomem2;
|
||||
digit = quorem2(b, s2);
|
||||
if (mlo == mhi) {
|
||||
mlo = mhi = multadd(PASS_STATE mlo, base, 0);
|
||||
if (!mhi)
|
||||
goto nomem2;
|
||||
}
|
||||
else {
|
||||
mlo = multadd(PASS_STATE mlo, base, 0);
|
||||
if (!mlo)
|
||||
goto nomem2;
|
||||
mhi = multadd(PASS_STATE mhi, base, 0);
|
||||
if (!mhi)
|
||||
goto nomem2;
|
||||
}
|
||||
|
||||
/* Do we yet have the shortest string that will round to d? */
|
||||
j = cmp(b, mlo);
|
||||
/* j is b/2^s2 compared with mlo/2^s2. */
|
||||
delta = diff(PASS_STATE s, mhi);
|
||||
if (!delta)
|
||||
goto nomem2;
|
||||
j1 = delta->sign ? 1 : cmp(b, delta);
|
||||
Bfree(PASS_STATE delta);
|
||||
/* j1 is b/2^s2 compared with 1 - mhi/2^s2. */
|
||||
|
||||
#ifndef ROUND_BIASED
|
||||
if (j1 == 0 && !(word1(d) & 1)) {
|
||||
if (j > 0)
|
||||
digit++;
|
||||
done = true;
|
||||
} else
|
||||
#endif
|
||||
if (j < 0 || (j == 0
|
||||
#ifndef ROUND_BIASED
|
||||
&& !(word1(d) & 1)
|
||||
#endif
|
||||
)) {
|
||||
if (j1 > 0) {
|
||||
/* Either dig or dig+1 would work here as the least significant digit.
|
||||
Use whichever would produce an output value closer to d. */
|
||||
b = lshift(PASS_STATE b, 1);
|
||||
if (!b)
|
||||
goto nomem2;
|
||||
j1 = cmp(b, s);
|
||||
if (j1 > 0) /* The even test (|| (j1 == 0 && (digit & 1))) is not here because it messes up odd base output
|
||||
* such as 3.5 in base 3. */
|
||||
digit++;
|
||||
}
|
||||
done = true;
|
||||
} else if (j1 > 0) {
|
||||
digit++;
|
||||
done = true;
|
||||
}
|
||||
MOZ_ASSERT(digit < (uint32_t)base);
|
||||
*p++ = BASEDIGIT(digit);
|
||||
} while (!done);
|
||||
Bfree(PASS_STATE b);
|
||||
Bfree(PASS_STATE s);
|
||||
if (mlo != mhi)
|
||||
Bfree(PASS_STATE mlo);
|
||||
Bfree(PASS_STATE mhi);
|
||||
}
|
||||
MOZ_ASSERT(p < buffer + DTOBASESTR_BUFFER_SIZE);
|
||||
*p = '\0';
|
||||
return buffer;
|
||||
}
|
||||
|
||||
DtoaState*
|
||||
js::NewDtoaState()
|
||||
{
|
||||
return newdtoa();
|
||||
}
|
||||
|
||||
void
|
||||
js::DestroyDtoaState(DtoaState* state)
|
||||
{
|
||||
destroydtoa(state);
|
||||
}
|
||||
|
||||
/* Cleanup pollution from dtoa.c */
|
||||
#undef Bias
|
||||
Loading…
Add table
Add a link
Reference in a new issue