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+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Communicator client code, released
+ * March 31, 1998.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+/*
+ * JS math package.
+ */
+#include "jsstddef.h"
+#include "jslibmath.h"
+#include <stdlib.h>
+#include "jstypes.h"
+#include "jslong.h"
+#include "prmjtime.h"
+#include "jsapi.h"
+#include "jsatom.h"
+#include "jscntxt.h"
+#include "jsconfig.h"
+#include "jslock.h"
+#include "jsmath.h"
+#include "jsnum.h"
+#include "jsobj.h"
+
+#ifndef M_E
+#define M_E 2.7182818284590452354
+#endif
+#ifndef M_LOG2E
+#define M_LOG2E 1.4426950408889634074
+#endif
+#ifndef M_LOG10E
+#define M_LOG10E 0.43429448190325182765
+#endif
+#ifndef M_LN2
+#define M_LN2 0.69314718055994530942
+#endif
+#ifndef M_LN10
+#define M_LN10 2.30258509299404568402
+#endif
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+#ifndef M_SQRT2
+#define M_SQRT2 1.41421356237309504880
+#endif
+#ifndef M_SQRT1_2
+#define M_SQRT1_2 0.70710678118654752440
+#endif
+
+static JSConstDoubleSpec math_constants[] = {
+ {M_E, "E", 0, {0,0,0}},
+ {M_LOG2E, "LOG2E", 0, {0,0,0}},
+ {M_LOG10E, "LOG10E", 0, {0,0,0}},
+ {M_LN2, "LN2", 0, {0,0,0}},
+ {M_LN10, "LN10", 0, {0,0,0}},
+ {M_PI, "PI", 0, {0,0,0}},
+ {M_SQRT2, "SQRT2", 0, {0,0,0}},
+ {M_SQRT1_2, "SQRT1_2", 0, {0,0,0}},
+ {0,0,0,{0,0,0}}
+};
+
+JSClass js_MathClass = {
+ js_Math_str,
+ JSCLASS_HAS_CACHED_PROTO(JSProto_Math),
+ JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
+ JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, JS_FinalizeStub,
+ JSCLASS_NO_OPTIONAL_MEMBERS
+};
+
+static JSBool
+math_abs(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+{
+ jsdouble x, z;
+
+ if (!js_ValueToNumber(cx, argv[0], &x))
+ return JS_FALSE;
+ z = fd_fabs(x);
+ return js_NewNumberValue(cx, z, rval);
+}
+
+static JSBool
+math_acos(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+{
+ jsdouble x, z;
+
+ if (!js_ValueToNumber(cx, argv[0], &x))
+ return JS_FALSE;
+ z = fd_acos(x);
+ return js_NewNumberValue(cx, z, rval);
+}
+
+static JSBool
+math_asin(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+{
+ jsdouble x, z;
+
+ if (!js_ValueToNumber(cx, argv[0], &x))
+ return JS_FALSE;
+ z = fd_asin(x);
+ return js_NewNumberValue(cx, z, rval);
+}
+
+static JSBool
+math_atan(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+{
+ jsdouble x, z;
+
+ if (!js_ValueToNumber(cx, argv[0], &x))
+ return JS_FALSE;
+ z = fd_atan(x);
+ return js_NewNumberValue(cx, z, rval);
+}
+
+static JSBool
+math_atan2(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+{
+ jsdouble x, y, z;
+
+ if (!js_ValueToNumber(cx, argv[0], &x))
+ return JS_FALSE;
+ if (!js_ValueToNumber(cx, argv[1], &y))
+ return JS_FALSE;
+#if !JS_USE_FDLIBM_MATH && defined(_MSC_VER)
+ /*
+ * MSVC's atan2 does not yield the result demanded by ECMA when both x
+ * and y are infinite.
+ * - The result is a multiple of pi/4.
+ * - The sign of x determines the sign of the result.
+ * - The sign of y determines the multiplicator, 1 or 3.
+ */
+ if (JSDOUBLE_IS_INFINITE(x) && JSDOUBLE_IS_INFINITE(y)) {
+ z = fd_copysign(M_PI / 4, x);
+ if (y < 0)
+ z *= 3;
+ return js_NewDoubleValue(cx, z, rval);
+ }
+#endif
+ z = fd_atan2(x, y);
+ return js_NewNumberValue(cx, z, rval);
+}
+
+static JSBool
+math_ceil(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+{
+ jsdouble x, z;
+
+ if (!js_ValueToNumber(cx, argv[0], &x))
+ return JS_FALSE;
+ z = fd_ceil(x);
+ return js_NewNumberValue(cx, z, rval);
+}
+
+static JSBool
+math_cos(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+{
+ jsdouble x, z;
+
+ if (!js_ValueToNumber(cx, argv[0], &x))
+ return JS_FALSE;
+ z = fd_cos(x);
+ return js_NewNumberValue(cx, z, rval);
+}
+
+static JSBool
+math_exp(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+{
+ jsdouble x, z;
+
+ if (!js_ValueToNumber(cx, argv[0], &x))
+ return JS_FALSE;
+#ifdef _WIN32
+ if (!JSDOUBLE_IS_NaN(x)) {
+ if (x == *cx->runtime->jsPositiveInfinity) {
+ *rval = DOUBLE_TO_JSVAL(cx->runtime->jsPositiveInfinity);
+ return JS_TRUE;
+ }
+ if (x == *cx->runtime->jsNegativeInfinity) {
+ *rval = JSVAL_ZERO;
+ return JS_TRUE;
+ }
+ }
+#endif
+ z = fd_exp(x);
+ return js_NewNumberValue(cx, z, rval);
+}
+
+static JSBool
+math_floor(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+{
+ jsdouble x, z;
+
+ if (!js_ValueToNumber(cx, argv[0], &x))
+ return JS_FALSE;
+ z = fd_floor(x);
+ return js_NewNumberValue(cx, z, rval);
+}
+
+static JSBool
+math_log(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+{
+ jsdouble x, z;
+
+ if (!js_ValueToNumber(cx, argv[0], &x))
+ return JS_FALSE;
+ z = fd_log(x);
+ return js_NewNumberValue(cx, z, rval);
+}
+
+static JSBool
+math_max(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+{
+ jsdouble x, z = *cx->runtime->jsNegativeInfinity;
+ uintN i;
+
+ if (argc == 0) {
+ *rval = DOUBLE_TO_JSVAL(cx->runtime->jsNegativeInfinity);
+ return JS_TRUE;
+ }
+ for (i = 0; i < argc; i++) {
+ if (!js_ValueToNumber(cx, argv[i], &x))
+ return JS_FALSE;
+ if (JSDOUBLE_IS_NaN(x)) {
+ *rval = DOUBLE_TO_JSVAL(cx->runtime->jsNaN);
+ return JS_TRUE;
+ }
+ if (x == 0 && x == z && fd_copysign(1.0, z) == -1)
+ z = x;
+ else
+ z = (x > z) ? x : z;
+ }
+ return js_NewNumberValue(cx, z, rval);
+}
+
+static JSBool
+math_min(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+{
+ jsdouble x, z = *cx->runtime->jsPositiveInfinity;
+ uintN i;
+
+ if (argc == 0) {
+ *rval = DOUBLE_TO_JSVAL(cx->runtime->jsPositiveInfinity);
+ return JS_TRUE;
+ }
+ for (i = 0; i < argc; i++) {
+ if (!js_ValueToNumber(cx, argv[i], &x))
+ return JS_FALSE;
+ if (JSDOUBLE_IS_NaN(x)) {
+ *rval = DOUBLE_TO_JSVAL(cx->runtime->jsNaN);
+ return JS_TRUE;
+ }
+ if (x == 0 && x == z && fd_copysign(1.0,x) == -1)
+ z = x;
+ else
+ z = (x < z) ? x : z;
+ }
+ return js_NewNumberValue(cx, z, rval);
+}
+
+static JSBool
+math_pow(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+{
+ jsdouble x, y, z;
+
+ if (!js_ValueToNumber(cx, argv[0], &x))
+ return JS_FALSE;
+ if (!js_ValueToNumber(cx, argv[1], &y))
+ return JS_FALSE;
+#if !JS_USE_FDLIBM_MATH
+ /*
+ * Because C99 and ECMA specify different behavior for pow(),
+ * we need to wrap the libm call to make it ECMA compliant.
+ */
+ if (!JSDOUBLE_IS_FINITE(y) && (x == 1.0 || x == -1.0)) {
+ *rval = DOUBLE_TO_JSVAL(cx->runtime->jsNaN);
+ return JS_TRUE;
+ }
+ /* pow(x, +-0) is always 1, even for x = NaN. */
+ if (y == 0) {
+ *rval = JSVAL_ONE;
+ return JS_TRUE;
+ }
+#endif
+ z = fd_pow(x, y);
+ return js_NewNumberValue(cx, z, rval);
+}
+
+/*
+ * Math.random() support, lifted from java.util.Random.java.
+ */
+static void
+random_setSeed(JSRuntime *rt, int64 seed)
+{
+ int64 tmp;
+
+ JSLL_I2L(tmp, 1000);
+ JSLL_DIV(seed, seed, tmp);
+ JSLL_XOR(tmp, seed, rt->rngMultiplier);
+ JSLL_AND(rt->rngSeed, tmp, rt->rngMask);
+}
+
+static void
+random_init(JSRuntime *rt)
+{
+ int64 tmp, tmp2;
+
+ /* Do at most once. */
+ if (rt->rngInitialized)
+ return;
+ rt->rngInitialized = JS_TRUE;
+
+ /* rt->rngMultiplier = 0x5DEECE66DL */
+ JSLL_ISHL(tmp, 0x5, 32);
+ JSLL_UI2L(tmp2, 0xDEECE66DL);
+ JSLL_OR(rt->rngMultiplier, tmp, tmp2);
+
+ /* rt->rngAddend = 0xBL */
+ JSLL_I2L(rt->rngAddend, 0xBL);
+
+ /* rt->rngMask = (1L << 48) - 1 */
+ JSLL_I2L(tmp, 1);
+ JSLL_SHL(tmp2, tmp, 48);
+ JSLL_SUB(rt->rngMask, tmp2, tmp);
+
+ /* rt->rngDscale = (jsdouble)(1L << 53) */
+ JSLL_SHL(tmp2, tmp, 53);
+ JSLL_L2D(rt->rngDscale, tmp2);
+
+ /* Finally, set the seed from current time. */
+ random_setSeed(rt, PRMJ_Now());
+}
+
+static uint32
+random_next(JSRuntime *rt, int bits)
+{
+ int64 nextseed, tmp;
+ uint32 retval;
+
+ JSLL_MUL(nextseed, rt->rngSeed, rt->rngMultiplier);
+ JSLL_ADD(nextseed, nextseed, rt->rngAddend);
+ JSLL_AND(nextseed, nextseed, rt->rngMask);
+ rt->rngSeed = nextseed;
+ JSLL_USHR(tmp, nextseed, 48 - bits);
+ JSLL_L2I(retval, tmp);
+ return retval;
+}
+
+static jsdouble
+random_nextDouble(JSRuntime *rt)
+{
+ int64 tmp, tmp2;
+ jsdouble d;
+
+ JSLL_ISHL(tmp, random_next(rt, 26), 27);
+ JSLL_UI2L(tmp2, random_next(rt, 27));
+ JSLL_ADD(tmp, tmp, tmp2);
+ JSLL_L2D(d, tmp);
+ return d / rt->rngDscale;
+}
+
+static JSBool
+math_random(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+{
+ JSRuntime *rt;
+ jsdouble z;
+
+ rt = cx->runtime;
+ JS_LOCK_RUNTIME(rt);
+ random_init(rt);
+ z = random_nextDouble(rt);
+ JS_UNLOCK_RUNTIME(rt);
+ return js_NewNumberValue(cx, z, rval);
+}
+
+#if defined _WIN32 && !defined WINCE && _MSC_VER < 1400
+/* Try to work around apparent _copysign bustage in VC6 and VC7. */
+double
+js_copysign(double x, double y)
+{
+ jsdpun xu, yu;
+
+ xu.d = x;
+ yu.d = y;
+ xu.s.hi &= ~JSDOUBLE_HI32_SIGNBIT;
+ xu.s.hi |= yu.s.hi & JSDOUBLE_HI32_SIGNBIT;
+ return xu.d;
+}
+#endif
+
+static JSBool
+math_round(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+{
+ jsdouble x, z;
+
+ if (!js_ValueToNumber(cx, argv[0], &x))
+ return JS_FALSE;
+ z = fd_copysign(fd_floor(x + 0.5), x);
+ return js_NewNumberValue(cx, z, rval);
+}
+
+static JSBool
+math_sin(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+{
+ jsdouble x, z;
+
+ if (!js_ValueToNumber(cx, argv[0], &x))
+ return JS_FALSE;
+ z = fd_sin(x);
+ return js_NewNumberValue(cx, z, rval);
+}
+
+static JSBool
+math_sqrt(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+{
+ jsdouble x, z;
+
+ if (!js_ValueToNumber(cx, argv[0], &x))
+ return JS_FALSE;
+ z = fd_sqrt(x);
+ return js_NewNumberValue(cx, z, rval);
+}
+
+static JSBool
+math_tan(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+{
+ jsdouble x, z;
+
+ if (!js_ValueToNumber(cx, argv[0], &x))
+ return JS_FALSE;
+ z = fd_tan(x);
+ return js_NewNumberValue(cx, z, rval);
+}
+
+#if JS_HAS_TOSOURCE
+static JSBool
+math_toSource(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
+ jsval *rval)
+{
+ *rval = ATOM_KEY(CLASS_ATOM(cx, Math));
+ return JS_TRUE;
+}
+#endif
+
+static JSFunctionSpec math_static_methods[] = {
+#if JS_HAS_TOSOURCE
+ {js_toSource_str, math_toSource, 0, 0, 0},
+#endif
+ {"abs", math_abs, 1, 0, 0},
+ {"acos", math_acos, 1, 0, 0},
+ {"asin", math_asin, 1, 0, 0},
+ {"atan", math_atan, 1, 0, 0},
+ {"atan2", math_atan2, 2, 0, 0},
+ {"ceil", math_ceil, 1, 0, 0},
+ {"cos", math_cos, 1, 0, 0},
+ {"exp", math_exp, 1, 0, 0},
+ {"floor", math_floor, 1, 0, 0},
+ {"log", math_log, 1, 0, 0},
+ {"max", math_max, 2, 0, 0},
+ {"min", math_min, 2, 0, 0},
+ {"pow", math_pow, 2, 0, 0},
+ {"random", math_random, 0, 0, 0},
+ {"round", math_round, 1, 0, 0},
+ {"sin", math_sin, 1, 0, 0},
+ {"sqrt", math_sqrt, 1, 0, 0},
+ {"tan", math_tan, 1, 0, 0},
+ {0,0,0,0,0}
+};
+
+JSObject *
+js_InitMathClass(JSContext *cx, JSObject *obj)
+{
+ JSObject *Math;
+
+ Math = JS_DefineObject(cx, obj, js_Math_str, &js_MathClass, NULL, 0);
+ if (!Math)
+ return NULL;
+ if (!JS_DefineFunctions(cx, Math, math_static_methods))
+ return NULL;
+ if (!JS_DefineConstDoubles(cx, Math, math_constants))
+ return NULL;
+ return Math;
+}
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