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347aaac8d3
- Switch improvements:
- JSOP_CONDSWITCH is a 1 byte nop, not variable length with the same kind
of immediate operand as JSOP_LOOKUPSWITCH (which is useless except for
decompilation). New scheme uses SRC_COMMA notes on each JSOP_CASE opcode,
usually 2 bytes per note, and a typically-1-byte 2nd offset on SRC_SWITCH:
1 + 2 * ncases
vs. the previous JSOP_LOOKUPSWITCH immediate, which consumed:
4 * ncases
bytes after the switch opcode just for decompilation.
- SRC_SWITCH has two offsets, first to end of switch as before, the second
to first case if JSOP_CONDSWITCH, for decompilation.
- Optimize switches with all-constant cases using JSOP_TABLESWITH, or if
that can't be used, JSOP_LOOKUPSWITCH, before falling back on ECMAv2's
JSOP_CONDSWITCH.
- Use cx->gcDisabled when evaluating case exprs at compile time for old,
pre-ECMAv2 switches, to prevent branch-callback-based GC invocations
from ripping apart the unrooted temporary script for each case expr.
- Fixed up stale SRC_SWITCH comments in jsemit.h.
jsemit.c jsemit.h
- TREE_CONTEXT_INIT to match ATOM_LIST_INIT, not English word order.
- Reorganized JSCodeGenerator to sort of match argument order to
js_InitCodeGenerator.
- Got rid of confusing CG_RESET* macros and used memset(cg, 0, sizeof *cg)
and non-zero-default init in js_InitCodeGenerator. js_ResetCodeGenerator
just releases the code and temp arena pools and leaves the cg in a state
where it must be re-initialized (as before, but more obvious).
- In the same spirit, don't do partial "resets" or src and trynotes in their
js_FinishTaking*Notes functions -- those are friends of jsscript.c and are
not general, idempotent functions.
jsapi.c jsapi.h jsarray.c jsatom.c jsatom.h jscntxt.c jsemit.c jsmsg.def
jsnum.c jsobj.c jsopcode.c jsregexp.c jsscan.c jsstr.c jsxdrapi.
- Use PR_snprintf rather than sprintf always, so we don't have to worry
about systems with 64-bit longs that overflow 12-byte buffers and open
Morris-Worm-type security holes.
- Trim extra spaces, fix hanging indentation, and similar anal retention.
- Renamed JSMSG_BAD_PROTO_SORT to JSMSG_BAD_SORT_ARG cuz that's what it
is complaining about.
- SRC_CATCHGUARD still lived in comments, but it's SRC_CATCH in code.
jscntxt.c jscntxt.h jsinterp.c
- Packed nearby JSPackedBools and added a new one: gcDisabled, for use by
jsemit.c's pre-ECMAv2 switch case expr eval.
- Rip out old js_InterpreterHooks stuff from original liveconnect (moja).
- Remove javaData and savedErrors from JSContext. Leaving it to fur or
shaver to remove javaData from jsscript.h.
168 lines
5.7 KiB
C
168 lines
5.7 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef jsnum_h___
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#define jsnum_h___
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/*
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* JS number (IEEE double) interface.
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*
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* JS numbers are optimistically stored in the top 31 bits of 32-bit integers,
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* but floating point literals, results that overflow 31 bits, and division and
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* modulus operands and results require a 64-bit IEEE double. These are GC'ed
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* and pointed to by 32-bit jsvals on the stack and in object properties.
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*
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* When a JS number is treated as an object (followed by . or []), the runtime
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* wraps it with a JSObject whose valueOf method returns the unwrapped number.
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*/
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PR_BEGIN_EXTERN_C
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#ifdef IS_LITTLE_ENDIAN
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#define JSDOUBLE_HI32(x) (((uint32 *)&(x))[1])
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#define JSDOUBLE_LO32(x) (((uint32 *)&(x))[0])
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#else
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#define JSDOUBLE_HI32(x) (((uint32 *)&(x))[0])
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#define JSDOUBLE_LO32(x) (((uint32 *)&(x))[1])
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#endif
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#define JSDOUBLE_HI32_SIGNBIT 0x80000000
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#define JSDOUBLE_HI32_EXPMASK 0x7ff00000
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#define JSDOUBLE_HI32_MANTMASK 0x000fffff
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#define JSDOUBLE_IS_NaN(x) \
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((JSDOUBLE_HI32(x) & JSDOUBLE_HI32_EXPMASK) == JSDOUBLE_HI32_EXPMASK && \
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(JSDOUBLE_LO32(x) || (JSDOUBLE_HI32(x) & JSDOUBLE_HI32_MANTMASK)))
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#define JSDOUBLE_IS_INFINITE(x) \
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((JSDOUBLE_HI32(x) & ~JSDOUBLE_HI32_SIGNBIT) == JSDOUBLE_HI32_EXPMASK && \
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!JSDOUBLE_LO32(x))
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#define JSDOUBLE_IS_FINITE(x) \
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((JSDOUBLE_HI32(x) & JSDOUBLE_HI32_EXPMASK) != JSDOUBLE_HI32_EXPMASK)
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#define JSDOUBLE_IS_NEGZERO(d) (JSDOUBLE_HI32(d) == JSDOUBLE_HI32_SIGNBIT && \
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JSDOUBLE_LO32(d) == 0)
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/*
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* JSDOUBLE_IS_INT first checks that d is neither NaN nor infinite, to avoid
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* raising SIGFPE on platforms such as Alpha Linux, then (only if the cast is
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* safe) leaves i as (jsint)d. This also avoid anomalous NaN floating point
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* comparisons under MSVC.
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*/
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#define JSDOUBLE_IS_INT(d, i) (JSDOUBLE_IS_FINITE(d) && !JSDOUBLE_IS_NEGZERO(d) \
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&& ((d) == (i = (jsint)(d))))
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/* Initialize the Number class, returning its prototype object. */
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extern JSObject *
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js_InitNumberClass(JSContext *cx, JSObject *obj);
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/* GC-allocate a new JS number. */
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extern jsdouble *
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js_NewDouble(JSContext *cx, jsdouble d);
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extern void
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js_FinalizeDouble(JSContext *cx, jsdouble *dp);
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extern JSBool
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js_NewDoubleValue(JSContext *cx, jsdouble d, jsval *rval);
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extern JSBool
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js_NewNumberValue(JSContext *cx, jsdouble d, jsval *rval);
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/* Construct a Number instance that wraps around d. */
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extern JSObject *
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js_NumberToObject(JSContext *cx, jsdouble d);
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/* Convert a number to a GC'ed string. */
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extern JSString *
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js_NumberToString(JSContext *cx, jsdouble d);
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/*
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* Convert a value to a number, returning false after reporting any error,
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* otherwise returning true with *dp set.
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*/
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extern JSBool
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js_ValueToNumber(JSContext *cx, jsval v, jsdouble *dp);
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/*
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* Convert a value or a double to an int32, according to the ECMA rules
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* for ToInt32.
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*/
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extern JSBool
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js_ValueToECMAInt32(JSContext *cx, jsval v, int32 *ip);
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extern JSBool
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js_DoubleToECMAInt32(JSContext *cx, jsdouble d, int32 *ip);
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/*
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* Convert a value or a double to a uint32, according to the ECMA rules
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* for ToUint32.
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*/
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extern JSBool
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js_ValueToECMAUint32(JSContext *cx, jsval v, uint32 *ip);
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extern JSBool
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js_DoubleToECMAUint32(JSContext *cx, jsdouble d, uint32 *ip);
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/*
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* Convert a value to a number, then to an int32 if it fits by rounding to
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* nearest; but failing with an error report if the double is out of range
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* or unordered.
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*/
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extern JSBool
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js_ValueToInt32(JSContext *cx, jsval v, int32 *ip);
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/*
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* Convert a value to a number, then to a uint16 according to the ECMA rules
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* for ToUint16.
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*/
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extern JSBool
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js_ValueToUint16(JSContext *cx, jsval v, uint16 *ip);
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/*
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* Convert a jsdouble to an integral number, stored in a jsdouble.
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* If d is NaN, return 0. If d is an infinity, return it without conversion.
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*/
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extern jsdouble
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js_DoubleToInteger(jsdouble d);
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/*
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* Similar to strtod except that replaces overflows with infinities of the correct
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* sign and underflows with zeros of the correct sign. Guaranteed to return the
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* closest double number to the given input in dp.
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* Also allows inputs of the form [+|-]Infinity, which produce an infinity of the
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* appropriate sign. The case of the "Infinity" string must match.
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* If the string does not have a number in it, set *ep to s and return 0.0 in dp.
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* Return false if out of memory.
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*/
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extern JSBool
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js_strtod(JSContext *cx, const jschar *s, const jschar **ep, jsdouble *dp);
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/*
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* Similar to strtol except that handles integers of arbitrary size. Guaranteed to
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* return the closest double number to the given input when radix is 10 or a power of 2.
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* May experience roundoff errors for very large numbers of a different radix.
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* If the string does not have a number in it, set *ep to s and return 0.0 in dp.
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* Return false if out of memory.
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*/
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extern JSBool
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js_strtointeger(JSContext *cx, const jschar *s, const jschar **ep, jsint radix, jsdouble *dp);
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PR_END_EXTERN_C
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#endif /* jsnum_h___ */
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