Browse Source

2020-11-08 release

pull/35/head
bellard 2 years ago
parent
commit
b1f67dfc1a
  1. 7
      Changelog
  2. 15
      Makefile
  3. 68
      TODO
  4. 2
      VERSION
  5. 734
      doc/jsbignum.html
  6. BIN
      doc/jsbignum.pdf
  7. 1369
      doc/quickjs.html
  8. BIN
      doc/quickjs.pdf
  9. 12
      doc/quickjs.texi
  10. 918
      jscompress.c
  11. 2
      libbf.h
  12. 26
      libregexp.c
  13. 11
      qjscalc.js
  14. 1
      quickjs-atom.h
  15. 95
      quickjs-libc.c
  16. 13
      quickjs-opcode.h
  17. 2541
      quickjs.c
  18. 9
      quickjs.h
  19. 79
      release.sh
  20. 17
      test262.conf
  21. 65
      test262_errors.txt
  22. 25
      tests/test_builtin.js
  23. 155
      tests/test_language.js

7
Changelog

@ -1,3 +1,10 @@
2020-11-08:
- improved function parameter initializers
- added std.setenv(), std.unsetenv() and std.getenviron()
- added JS_EvalThis()
- misc bug fixes
2020-09-06:
- added logical assignment operators

15
Makefile

@ -28,9 +28,9 @@ endif
# Windows cross compilation from Linux
#CONFIG_WIN32=y
# use link time optimization (smaller and faster executables but slower build)
CONFIG_LTO=y
#CONFIG_LTO=y
# consider warnings as errors (for development)
#CONFIG_WERROR=y
CONFIG_WERROR=y
# force 32 bit build for some utilities
#CONFIG_M32=y
@ -53,7 +53,11 @@ CONFIG_BIGNUM=y
OBJDIR=.obj
ifdef CONFIG_WIN32
CROSS_PREFIX=i686-w64-mingw32-
ifdef CONFIG_M32
CROSS_PREFIX=i686-w64-mingw32-
else
CROSS_PREFIX=x86_64-w64-mingw32-
endif
EXE=.exe
else
CROSS_PREFIX=
@ -281,15 +285,12 @@ $(OBJDIR)/%.check.o: %.c | $(OBJDIR)
regexp_test: libregexp.c libunicode.c cutils.c
$(CC) $(LDFLAGS) $(CFLAGS) -DTEST -o $@ libregexp.c libunicode.c cutils.c $(LIBS)
jscompress: jscompress.c
$(CC) $(LDFLAGS) $(CFLAGS) -o $@ jscompress.c
unicode_gen: $(OBJDIR)/unicode_gen.host.o $(OBJDIR)/cutils.host.o libunicode.c unicode_gen_def.h
$(HOST_CC) $(LDFLAGS) $(CFLAGS) -o $@ $(OBJDIR)/unicode_gen.host.o $(OBJDIR)/cutils.host.o
clean:
rm -f repl.c qjscalc.c out.c
rm -f *.a *.o *.d *~ jscompress unicode_gen regexp_test $(PROGS)
rm -f *.a *.o *.d *~ unicode_gen regexp_test $(PROGS)
rm -f hello.c test_fib.c
rm -f examples/*.so tests/*.so
rm -rf $(OBJDIR)/ *.dSYM/ qjs-debug

68
TODO

@ -1,13 +1,11 @@
Misc:
- use realpath in module name normalizer and put it in quickjs-libc
- use custom printf to avoid C library compatibility issues
- rename CONFIG_ALL_UNICODE, CONFIG_BIGNUM, CONFIG_ATOMICS, CONFIG_CHECK_JSVALUE ?
Bugs:
- modules: better error handling with cyclic module references
Misc ideas:
- use custom printf to avoid compatibility issues with floating point numbers
- consistent naming for preprocessor defines
- unify coding style and naming conventions
- use names from the ECMA spec in library implementation
- modules: if no ".", use a well known module loading path ?
- use JSHoistedDef only for global variables (JSHoistedDef.var_name != JS_ATOM_NULL)
- add index in JSVarDef and is_arg flag to merge args and vars in JSFunctionDef
- replace most JSVarDef flags with var_type enumeration
- use byte code emitters with typed arguments (for clarity)
- use 2 bytecode DynBufs in JSFunctionDef, one for reading, one for writing
and use the same wrappers in all phases
@ -15,19 +13,36 @@ Misc:
- use custom timezone support to avoid C library compatibility issues
Memory:
- use memory pools for objects, etc?
- test border cases for max number of atoms, object properties, string length
- add emergency malloc mode for out of memory exceptions.
- test all DynBuf memory errors
- test all js_realloc memory errors
- bignum: handle memory errors
- use memory pools for objects, etc?
- improve JS_ComputeMemoryUsage() with more info
Optimizations:
Built-in standard library:
- BSD sockets
- modules: use realpath in module name normalizer and put it in quickjs-libc
- modules: if no ".", use a well known module loading path ?
- get rid of __loadScript, use more common name
REPL:
- debugger
- readline: support MS Windows terminal
- readline: handle dynamic terminal resizing
- readline: handle double width unicode characters
- multiline editing
- runtime object and function inspectors
- interactive object browser
- use more generic approach to display evaluation results
- improve directive handling: dispatch, colorize, completion...
- save history
- close all predefined methods in repl.js and jscalc.js
Optimization ideas:
- 64-bit atoms in 64-bit mode ?
- use auto-init properties for more global objects
- 64-bit small bigint in 64-bit mode ?
- reuse stack slots for disjoint scopes, if strip
- optimize `for of` iterator for built-in array objects
- add heuristic to avoid some cycles in closures
- small String (0-2 charcodes) with immediate storage
- perform static string concatenation at compile time
@ -36,43 +51,20 @@ Optimizations:
- optimize `s += a + b`, `s += a.b` and similar simple expressions
- ensure string canonical representation and optimise comparisons and hashes?
- remove JSObject.first_weak_ref, use bit+context based hashed array for weak references
- optimize function storage with length and name accessors?
- property access optimization on the global object, functions,
prototypes and special non extensible objects.
- create object literals with the correct length by backpatching length argument
- remove redundant set_loc_uninitialized/check_uninitialized opcodes
- peephole optim: push_atom_value, to_propkey -> push_atom_value
- peephole optim: put_loc x, get_loc_check x -> set_loc x
- comparative performance benchmark
- use variable name when throwing uninitialized exception if available
- convert slow array to fast array when all properties != length are numeric
- optimize destructuring assignments for global and local variables
- implement some form of tail-call-optimization
- optimize OP_apply
- optimize f(...b)
Extensions:
- support more features in [features] section
- add built-in preprocessor in compiler, get rid of jscompress
handle #if, #ifdef, #line, limited support for #define
- get rid of __loadScript, use more common name
- BSD sockets
REPL:
- debugger
- readline: support MS Windows terminal
- readline: handle dynamic terminal resizing
- readline: handle double width unicode characters
- multiline editing
- runtime object and function inspectors
- interactive object browser
- use more generic approach to display evaluation results
- improve directive handling: dispatch, colorize, completion...
- save history
- close all predefined methods in repl.js and jscalc.js
Test262o: 0/11262 errors, 463 excluded
Test262o commit: 7da91bceb9ce7613f87db47ddd1292a2dda58b42 (es5-tests branch)
Test262: 30/71748 errors, 868 excluded, 474 skipped
Test262 commit: 24c67328062383079ada85f4d253eb0526fd209b
Result: 51/75119 errors, 899 excluded, 570 skipped
Test262 commit: 1c33fdb0ca60fb9d7392403be769ed0d26209132

2
VERSION

@ -1 +1 @@
2020-09-06
2020-11-08

734
doc/jsbignum.html

@ -1,734 +0,0 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- Created by GNU Texinfo 6.1, http://www.gnu.org/software/texinfo/ -->
<head>
<title>Javascript Bignum Extensions</title>
<meta name="description" content="Javascript Bignum Extensions">
<meta name="keywords" content="Javascript Bignum Extensions">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link href="#SEC_Contents" rel="contents" title="Table of Contents">
<style type="text/css">
<!--
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blockquote.indentedblock {margin-right: 0em}
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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div.display {margin-left: 3.2em}
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-->
</style>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body lang="en">
<h1 class="settitle" align="center">Javascript Bignum Extensions</h1>
<a name="SEC_Contents"></a>
<h2 class="contents-heading">Table of Contents</h2>
<div class="contents">
<ul class="no-bullet">
<li><a name="toc-Introduction" href="#Introduction">1 Introduction</a></li>
<li><a name="toc-Operator-overloading" href="#Operator-overloading">2 Operator overloading</a></li>
<li><a name="toc-BigInt-extensions" href="#BigInt-extensions">3 BigInt extensions</a></li>
<li><a name="toc-BigFloat" href="#BigFloat">4 BigFloat</a>
<ul class="no-bullet">
<li><a name="toc-Introduction-1" href="#Introduction-1">4.1 Introduction</a></li>
<li><a name="toc-Floating-point-rounding" href="#Floating-point-rounding">4.2 Floating point rounding</a></li>
<li><a name="toc-Operators" href="#Operators">4.3 Operators</a></li>
<li><a name="toc-BigFloat-literals" href="#BigFloat-literals">4.4 BigFloat literals</a></li>
<li><a name="toc-Builtin-Object-changes" href="#Builtin-Object-changes">4.5 Builtin Object changes</a>
<ul class="no-bullet">
<li><a name="toc-BigFloat-function" href="#BigFloat-function">4.5.1 <code>BigFloat</code> function</a></li>
<li><a name="toc-BigFloat_002eprototype" href="#BigFloat_002eprototype">4.5.2 <code>BigFloat.prototype</code></a></li>
<li><a name="toc-BigFloatEnv-constructor" href="#BigFloatEnv-constructor">4.5.3 <code>BigFloatEnv</code> constructor</a></li>
</ul></li>
</ul></li>
<li><a name="toc-BigDecimal" href="#BigDecimal">5 BigDecimal</a>
<ul class="no-bullet">
<li><a name="toc-Operators-1" href="#Operators-1">5.1 Operators</a></li>
<li><a name="toc-BigDecimal-literals" href="#BigDecimal-literals">5.2 BigDecimal literals</a></li>
<li><a name="toc-Builtin-Object-changes-1" href="#Builtin-Object-changes-1">5.3 Builtin Object changes</a>
<ul class="no-bullet">
<li><a name="toc-The-BigDecimal-function_002e" href="#The-BigDecimal-function_002e">5.3.1 The <code>BigDecimal</code> function.</a></li>
<li><a name="toc-Properties-of-the-BigDecimal-object" href="#Properties-of-the-BigDecimal-object">5.3.2 Properties of the <code>BigDecimal</code> object</a></li>
<li><a name="toc-Properties-of-the-BigDecimal_002eprototype-object" href="#Properties-of-the-BigDecimal_002eprototype-object">5.3.3 Properties of the <code>BigDecimal.prototype</code> object</a></li>
</ul></li>
</ul></li>
<li><a name="toc-Math-mode" href="#Math-mode">6 Math mode</a></li>
</ul>
</div>
<a name="Introduction"></a>
<h2 class="chapter">1 Introduction</h2>
<p>The Bignum extensions add the following features to the Javascript
language while being 100% backward compatible:
</p>
<ul>
<li> Operator overloading with a dispatch logic inspired from the proposal available at <a href="https://github.com/tc39/proposal-operator-overloading/">https://github.com/tc39/proposal-operator-overloading/</a>.
</li><li> Arbitrarily large floating point numbers (<code>BigFloat</code>) in base 2 using the IEEE 754 semantics.
</li><li> Arbitrarily large floating point numbers (<code>BigDecimal</code>) in base 10 based on the proposal available at
<a href="https://github.com/littledan/proposal-bigdecimal">https://github.com/littledan/proposal-bigdecimal</a>.
</li><li> <code>math</code> mode: arbitrarily large integers and floating point numbers are available by default. The integer division and power can be overloaded for example to return a fraction. The modulo operator (<code>%</code>) is defined as the Euclidian
remainder. <code>^</code> is an alias to the power operator
(<code>**</code>). <code>^^</code> is used as the exclusive or operator.
</li></ul>
<p>The extensions are independent from each other except the <code>math</code>
mode which relies on BigFloat and operator overloading.
</p>
<a name="Operator-overloading"></a>
<h2 class="chapter">2 Operator overloading</h2>
<p>Operator overloading is inspired from the proposal available at
<a href="https://github.com/tc39/proposal-operator-overloading/">https://github.com/tc39/proposal-operator-overloading/</a>. It
implements the same dispatch logic but finds the operator sets by
looking at the <code>Symbol.operatorSet</code> property in the objects. The
changes were done in order to simplify the implementation.
</p>
<p>More precisely, the following modifications were made:
</p>
<ul>
<li> <code>with operators from</code> is not supported. Operator overloading is always enabled.
</li><li> The dispatch is not based on a static <code>[[OperatorSet]]</code> field in all instances. Instead, a dynamic lookup of the <code>Symbol.operatorSet</code> property is done. This property is typically added in the prototype of each object.
</li><li> <code>Operators.create(...dictionaries)</code> is used to create a new OperatorSet object. The <code>Operators</code> function is supported as an helper to be closer to the TC39 proposal.
</li><li> <code>[]</code> cannot be overloaded.
</li><li> In math mode, the BigInt division and power operators can be overloaded with <code>Operators.updateBigIntOperators(dictionary)</code>.
</li></ul>
<a name="BigInt-extensions"></a>
<h2 class="chapter">3 BigInt extensions</h2>
<p>A few properties are added to the BigInt object:
</p>
<dl compact="compact">
<dt><code>tdiv(a, b)</code></dt>
<dd><p>Return <em>trunc(a/b)</em>. <code>b = 0</code> raises a RangeError
exception.
</p>
</dd>
<dt><code>fdiv(a, b)</code></dt>
<dd><p>Return <em>\lfloor a/b \rfloor</em>. <code>b = 0</code> raises a RangeError
exception.
</p>
</dd>
<dt><code>cdiv(a, b)</code></dt>
<dd><p>Return <em>\lceil a/b \rceil</em>. <code>b = 0</code> raises a RangeError
exception.
</p>
</dd>
<dt><code>ediv(a, b)</code></dt>
<dd><p>Return <em>sgn(b) \lfloor a/{|b|} \rfloor</em> (Euclidian
division). <code>b = 0</code> raises a RangeError exception.
</p>
</dd>
<dt><code>tdivrem(a, b)</code></dt>
<dt><code>fdivrem(a, b)</code></dt>
<dt><code>cdivrem(a, b)</code></dt>
<dt><code>edivrem(a, b)</code></dt>
<dd><p>Return an array of two elements. The first element is the quotient,
the second is the remainder. The same rounding is done as the
corresponding division operation.
</p>
</dd>
<dt><code>sqrt(a)</code></dt>
<dd><p>Return <em>\lfloor \sqrt(a) \rfloor</em>. A RangeError exception is
raised if <em>a &lt; 0</em>.
</p>
</dd>
<dt><code>sqrtrem(a)</code></dt>
<dd><p>Return an array of two elements. The first element is <em>\lfloor
\sqrt{a} \rfloor</em>. The second element is <em>a-\lfloor \sqrt{a}
\rfloor^2</em>. A RangeError exception is raised if <em>a &lt; 0</em>.
</p>
</dd>
<dt><code>floorLog2(a)</code></dt>
<dd><p>Return -1 if <em>a \leq 0</em> otherwise return <em>\lfloor \log2(a) \rfloor</em>.
</p>
</dd>
<dt><code>ctz(a)</code></dt>
<dd><p>Return the number of trailing zeros in the two&rsquo;s complement binary representation of a. Return -1 if <em>a=0</em>.
</p>
</dd>
</dl>
<a name="BigFloat"></a>
<h2 class="chapter">4 BigFloat</h2>
<a name="Introduction-1"></a>
<h3 class="section">4.1 Introduction</h3>
<p>This extension adds the <code>BigFloat</code> primitive type. The
<code>BigFloat</code> type represents floating point numbers in base 2
with the IEEE 754 semantics. A floating
point number is represented as a sign, mantissa and exponent. The
special values <code>NaN</code>, <code>+/-Infinity</code>, <code>+0</code> and <code>-0</code>
are supported. The mantissa and exponent can have any bit length with
an implementation specific minimum and maximum.
</p>
<a name="Floating-point-rounding"></a>
<h3 class="section">4.2 Floating point rounding</h3>
<p>Each floating point operation operates with infinite precision and
then rounds the result according to the specified floating point
environment (<code>BigFloatEnv</code> object). The status flags of the
environment are also set according to the result of the operation.
</p>
<p>If no floating point environment is provided, the global floating
point environment is used.
</p>
<p>The rounding mode of the global floating point environment is always
<code>RNDN</code> (&ldquo;round to nearest with ties to even&rdquo;)<a name="DOCF1" href="#FOOT1"><sup>1</sup></a>. The status flags of the global environment cannot be
read<a name="DOCF2" href="#FOOT2"><sup>2</sup></a>. The precision of the global environment is
<code>BigFloatEnv.prec</code>. The number of exponent bits of the global
environment is <code>BigFloatEnv.expBits</code>. The global environment
subnormal flag is set to <code>true</code>.
</p>
<p>For example, <code>prec = 53</code> and <code> expBits = 11</code> exactly give
the same precision as the IEEE 754 64 bit floating point format. The
default precision is <code>prec = 113</code> and <code> expBits = 15</code> (IEEE
754 128 bit floating point format).
</p>
<p>The global floating point environment can only be modified temporarily
when calling a function (see <code>BigFloatEnv.setPrec</code>). Hence a
function can change the global floating point environment for its
callees but not for its caller.
</p>
<a name="Operators"></a>
<h3 class="section">4.3 Operators</h3>
<p>The builtin operators are extended so that a BigFloat is returned if
at least one operand is a BigFloat. The computations are always done
with infinite precision and rounded according to the global floating
point environment.
</p>
<p><code>typeof</code> applied on a <code>BigFloat</code> returns <code>bigfloat</code>.
</p>
<p>BigFloat can be compared with all the other numeric types and the
result follows the expected mathematical relations.
</p>
<p>However, since BigFloat and Number are different types they are never
equal when using the strict comparison operators (e.g. <code>0.0 ===
0.0l</code> is false).
</p>
<a name="BigFloat-literals"></a>
<h3 class="section">4.4 BigFloat literals</h3>
<p>BigFloat literals are floating point numbers with a trailing <code>l</code>
suffix. BigFloat literals have an infinite precision. They are rounded
according to the global floating point environment when they are
evaluated.<a name="DOCF3" href="#FOOT3"><sup>3</sup></a>
</p>
<a name="Builtin-Object-changes"></a>
<h3 class="section">4.5 Builtin Object changes</h3>
<a name="BigFloat-function"></a>
<h4 class="subsection">4.5.1 <code>BigFloat</code> function</h4>
<p>The <code>BigFloat</code> function cannot be invoked as a constructor. When
invoked as a function: the parameter is converted to a primitive
type. If the result is a numeric type, it is converted to BigFloat
without rounding. If the result is a string, it is converted to
BigFloat using the precision of the global floating point environment.
</p>
<p><code>BigFloat</code> properties:
</p>
<dl compact="compact">
<dt><code>LN2</code></dt>
<dt><code>PI</code></dt>
<dd><p>Getter. Return the value of the corresponding mathematical constant
rounded to nearest, ties to even with the current global
precision. The constant values are cached for small precisions.
</p>
</dd>
<dt><code>MIN_VALUE</code></dt>
<dt><code>MAX_VALUE</code></dt>
<dt><code>EPSILON</code></dt>
<dd><p>Getter. Return the minimum, maximum and epsilon <code>BigFloat</code> values
(same definition as the corresponding <code>Number</code> constants).
</p>
</dd>
<dt><code>fpRound(a[, e])</code></dt>
<dd><p>Round the floating point number <code>a</code> according to the floating
point environment <code>e</code> or the global environment if <code>e</code> is
undefined.
</p>
</dd>
<dt><code>parseFloat(a[, radix[, e]])</code></dt>
<dd><p>Parse the string <code>a</code> as a floating point number in radix
<code>radix</code>. The radix is 0 (default) or from 2 to 36. The radix 0
means radix 10 unless there is a hexadecimal or binary prefix. The
result is rounded according to the floating point environment <code>e</code>
or the global environment if <code>e</code> is undefined.
</p>
</dd>
<dt><code>isFinite(a)</code></dt>
<dd><p>Return true if <code>a</code> is a finite bigfloat.
</p>
</dd>
<dt><code>isNaN(a)</code></dt>
<dd><p>Return true if <code>a</code> is a NaN bigfloat.
</p>
</dd>
<dt><code>add(a, b[, e])</code></dt>
<dt><code>sub(a, b[, e])</code></dt>
<dt><code>mul(a, b[, e])</code></dt>
<dt><code>div(a, b[, e])</code></dt>
<dd><p>Perform the specified floating point operation and round the floating
point number <code>a</code> according to the floating point environment
<code>e</code> or the global environment if <code>e</code> is undefined. If
<code>e</code> is specified, the floating point status flags are updated.
</p>
</dd>
<dt><code>floor(x)</code></dt>
<dt><code>ceil(x)</code></dt>
<dt><code>round(x)</code></dt>
<dt><code>trunc(x)</code></dt>
<dd><p>Round to an integer. No additional rounding is performed.
</p>
</dd>
<dt><code>abs(x)</code></dt>
<dd><p>Return the absolute value of x. No additional rounding is performed.
</p>
</dd>
<dt><code>fmod(x, y[, e])</code></dt>
<dt><code>remainder(x, y[, e])</code></dt>
<dd><p>Floating point remainder. The quotient is truncated to zero (fmod) or
to the nearest integer with ties to even (remainder). <code>e</code> is an
optional floating point environment.
</p>
</dd>
<dt><code>sqrt(x[, e])</code></dt>
<dd><p>Square root. Return a rounded floating point number. <code>e</code> is an
optional floating point environment.
</p>
</dd>
<dt><code>sin(x[, e])</code></dt>
<dt><code>cos(x[, e])</code></dt>
<dt><code>tan(x[, e])</code></dt>
<dt><code>asin(x[, e])</code></dt>
<dt><code>acos(x[, e])</code></dt>
<dt><code>atan(x[, e])</code></dt>
<dt><code>atan2(x, y[, e])</code></dt>
<dt><code>exp(x[, e])</code></dt>
<dt><code>log(x[, e])</code></dt>
<dt><code>pow(x, y[, e])</code></dt>
<dd><p>Transcendental operations. Return a rounded floating point
number. <code>e</code> is an optional floating point environment.
</p>
</dd>
</dl>
<a name="BigFloat_002eprototype"></a>
<h4 class="subsection">4.5.2 <code>BigFloat.prototype</code></h4>
<p>The following properties are modified:
</p>
<dl compact="compact">
<dt><code>valueOf()</code></dt>
<dd><p>Return the bigfloat primitive value corresponding to <code>this</code>.
</p>
</dd>
<dt><code>toString(radix)</code></dt>
<dd>
<p>For floating point numbers:
</p>
<ul>
<li> If the radix is a power of two, the conversion is done with infinite
precision.
</li><li> Otherwise, the number is rounded to nearest with ties to even using
the global precision. It is then converted to string using the minimum
number of digits so that its conversion back to a floating point using
the global precision and round to nearest gives the same number.
</li></ul>
<p>The exponent letter is <code>e</code> for base 10, <code>p</code> for bases 2, 8,
16 with a binary exponent and <code>@</code> for the other bases.
</p>
</dd>
<dt><code>toPrecision(p, rnd_mode = BigFloatEnv.RNDNA, radix = 10)</code></dt>
<dt><code>toFixed(p, rnd_mode = BigFloatEnv.RNDNA, radix = 10)</code></dt>
<dt><code>toExponential(p, rnd_mode = BigFloatEnv.RNDNA, radix = 10)</code></dt>
<dd><p>Same semantics as the corresponding <code>Number</code> functions with
BigFloats. There is no limit on the accepted precision <code>p</code>. The
rounding mode and radix can be optionally specified. The radix must be
between 2 and 36.
</p>
</dd>
</dl>
<a name="BigFloatEnv-constructor"></a>
<h4 class="subsection">4.5.3 <code>BigFloatEnv</code> constructor</h4>
<p>The <code>BigFloatEnv([p, [,rndMode]]</code> constructor cannot be invoked as a
function. The floating point environment contains:
</p>
<ul>
<li> the mantissa precision in bits
</li><li> the exponent size in bits assuming an IEEE 754 representation;
</li><li> the subnormal flag (if true, subnormal floating point numbers can
be generated by the floating point operations).
</li><li> the rounding mode
</li><li> the floating point status. The status flags can only be set by the floating point operations. They can be reset with <code>BigFloatEnv.prototype.clearStatus()</code> or with the various status flag setters.
</li></ul>
<p><code>new BigFloatEnv([p, [,rndMode]]</code> creates a new floating point
environment. The status flags are reset. If no parameter is given the
precision, exponent bits and subnormal flags are copied from the
global floating point environment. Otherwise, the precision is set to
<code>p</code>, the number of exponent bits is set to <code>expBitsMax</code> and the
subnormal flags is set to <code>false</code>. If <code>rndMode</code> is
<code>undefined</code>, the rounding mode is set to <code>RNDN</code>.
</p>
<p><code>BigFloatEnv</code> properties:
</p>
<dl compact="compact">
<dt><code>prec</code></dt>
<dd><p>Getter. Return the precision in bits of the global floating point
environment. The initial value is <code>113</code>.
</p>
</dd>
<dt><code>expBits</code></dt>
<dd><p>Getter. Return the exponent size in bits of the global floating point
environment assuming an IEEE 754 representation. The initial value is
<code>15</code>.
</p>
</dd>
<dt><code>setPrec(f, p[, e])</code></dt>
<dd><p>Set the precision of the global floating point environment to <code>p</code>
and the exponent size to <code>e</code> then call the function
<code>f</code>. Then the Float precision and exponent size are reset to
their precious value and the return value of <code>f</code> is returned (or
an exception is raised if <code>f</code> raised an exception). If <code>e</code>
is <code>undefined</code> it is set to <code>BigFloatEnv.expBitsMax</code>.
</p>
</dd>
<dt><code>precMin</code></dt>
<dd><p>Read-only integer. Return the minimum allowed precision. Must be at least 2.
</p>
</dd>
<dt><code>precMax</code></dt>
<dd><p>Read-only integer. Return the maximum allowed precision. Must be at least 113.
</p>
</dd>
<dt><code>expBitsMin</code></dt>
<dd><p>Read-only integer. Return the minimum allowed exponent size in
bits. Must be at least 3.
</p>
</dd>
<dt><code>expBitsMax</code></dt>
<dd><p>Read-only integer. Return the maximum allowed exponent size in
bits. Must be at least 15.
</p>
</dd>
<dt><code>RNDN</code></dt>
<dd><p>Read-only integer. Round to nearest, with ties to even rounding mode.
</p>
</dd>
<dt><code>RNDZ</code></dt>
<dd><p>Read-only integer. Round to zero rounding mode.
</p>
</dd>
<dt><code>RNDD</code></dt>
<dd><p>Read-only integer. Round to -Infinity rounding mode.
</p>
</dd>
<dt><code>RNDU</code></dt>
<dd><p>Read-only integer. Round to +Infinity rounding mode.
</p>
</dd>
<dt><code>RNDNA</code></dt>
<dd><p>Read-only integer. Round to nearest, with ties away from zero rounding mode.
</p>
</dd>
<dt><code>RNDA</code></dt>
<dd><p>Read-only integer. Round away from zero rounding mode.
</p>
</dd>
<dt><code>RNDF<a name="DOCF4" href="#FOOT4"><sup>4</sup></a></code></dt>
<dd><p>Read-only integer. Faithful rounding mode. The result is
non-deterministically rounded to -Infinity or +Infinity. This rounding
mode usually gives a faster and deterministic running time for the
floating point operations.
</p>
</dd>
</dl>
<p><code>BigFloatEnv.prototype</code> properties:
</p>
<dl compact="compact">
<dt><code>prec</code></dt>
<dd><p>Getter and setter (Integer). Return or set the precision in bits.
</p>
</dd>
<dt><code>expBits</code></dt>
<dd><p>Getter and setter (Integer). Return or set the exponent size in bits
assuming an IEEE 754 representation.
</p>
</dd>
<dt><code>rndMode</code></dt>
<dd><p>Getter and setter (Integer). Return or set the rounding mode.
</p>
</dd>
<dt><code>subnormal</code></dt>
<dd><p>Getter and setter (Boolean). subnormal flag. It is false when
<code>expBits = expBitsMax</code>.
</p>
</dd>
<dt><code>clearStatus()</code></dt>
<dd><p>Clear the status flags.
</p>
</dd>
<dt><code>invalidOperation</code></dt>
<dt><code>divideByZero</code></dt>
<dt><code>overflow</code></dt>
<dt><code>underflow</code></dt>
<dt><code>inexact</code></dt>
<dd><p>Getter and setter (Boolean). Status flags.
</p>
</dd>
</dl>
<a name="BigDecimal"></a>
<h2 class="chapter">5 BigDecimal</h2>
<p>This extension adds the <code>BigDecimal</code> primitive type. The
<code>BigDecimal</code> type represents floating point numbers in base
10. It is inspired from the proposal available at
<a href="https://github.com/littledan/proposal-bigdecimal">https://github.com/littledan/proposal-bigdecimal</a>.
</p>
<p>The <code>BigDecimal</code> floating point numbers are always normalized and
finite. There is no concept of <code>-0</code>, <code>Infinity</code> or
<code>NaN</code>. By default, all the computations are done with infinite
precision.
</p>
<a name="Operators-1"></a>
<h3 class="section">5.1 Operators</h3>
<p>The following builtin operators support BigDecimal:
</p>
<dl compact="compact">
<dt><code>+</code></dt>
<dt><code>-</code></dt>
<dt><code>*</code></dt>
<dd><p>Both operands must be BigDecimal. The result is computed with infinite
precision.
</p></dd>
<dt><code>%</code></dt>
<dd><p>Both operands must be BigDecimal. The result is computed with infinite
precision. A range error is throws in case of division by zero.
</p>
</dd>
<dt><code>/</code></dt>
<dd><p>Both operands must be BigDecimal. A range error is throws in case of
division by zero or if the result cannot be represented with infinite
precision (use <code>BigDecimal.div</code> to specify the rounding).
</p>
</dd>
<dt><code>**</code></dt>
<dd><p>Both operands must be BigDecimal. The exponent must be a positive
integer. The result is computed with infinite precision.
</p>
</dd>
<dt><code>===</code></dt>
<dd><p>When one of the operand is a BigDecimal, return true if both operands
are a BigDecimal and if they are equal.
</p>
</dd>
<dt><code>==</code></dt>
<dt><code>!=</code></dt>
<dt><code>&lt;=</code></dt>
<dt><code>&gt;=</code></dt>
<dt><code>&lt;</code></dt>
<dt><code>&gt;</code></dt>
<dd>
<p>Numerical comparison. When one of the operand is not a BigDecimal, it is
converted to BigDecimal by using ToString(). Hence comparisons between
Number and BigDecimal do not use the exact mathematical value of the
Number value.
</p>
</dd>
</dl>
<a name="BigDecimal-literals"></a>
<h3 class="section">5.2 BigDecimal literals</h3>
<p>BigDecimal literals are decimal floating point numbers with a trailing
<code>m</code> suffix.
</p>
<a name="Builtin-Object-changes-1"></a>
<h3 class="section">5.3 Builtin Object changes</h3>
<a name="The-BigDecimal-function_002e"></a>
<h4 class="subsection">5.3.1 The <code>BigDecimal</code> function.</h4>
<p>It returns <code>0m</code> if no parameter is provided. Otherwise the first
parameter is converted to a bigdecimal by using ToString(). Hence
Number values are not converted to their exact numerical value as
BigDecimal.
</p>
<a name="Properties-of-the-BigDecimal-object"></a>
<h4 class="subsection">5.3.2 Properties of the <code>BigDecimal</code> object</h4>
<dl compact="compact">
<dt><code>add(a, b[, e])</code></dt>
<dt><code>sub(a, b[, e])</code></dt>
<dt><code>mul(a, b[, e])</code></dt>
<dt><code>div(a, b[, e])</code></dt>
<dt><code>mod(a, b[, e])</code></dt>
<dt><code>sqrt(a, e)</code></dt>
<dt><code>round(a, e)</code></dt>
<dd><p>Perform the specified floating point operation and round the floating
point result according to the rounding object <code>e</code>. If the
rounding object is not present, the operation is executed with
infinite precision.
</p>
<p>For <code>div</code>, a <code>RangeError</code> exception is thrown in case of
division by zero or if the result cannot be represented with infinite
precision if no rounding object is present.
</p>
<p>For <code>sqrt</code>, a range error is thrown if <code>a</code> is less than
zero.
</p>
<p>The rounding object must contain the following properties:
<code>roundingMode</code> is a string specifying the rounding mode
(<code>&quot;floor&quot;</code>, <code>&quot;ceiling&quot;</code>, <code>&quot;down&quot;</code>, <code>&quot;up&quot;</code>,
<code>&quot;half-even&quot;</code>, <code>&quot;half-up&quot;</code>). Either
<code>maximumSignificantDigits</code> or <code>maximumFractionDigits</code> must
be present to specify respectively the number of significant digits
(must be &gt;= 1) or the number of digits after the decimal point (must
be &gt;= 0).
</p>
</dd>
</dl>
<a name="Properties-of-the-BigDecimal_002eprototype-object"></a>
<h4 class="subsection">5.3.3 Properties of the <code>BigDecimal.prototype</code> object</h4>
<dl compact="compact">
<dt><code>valueOf()</code></dt>
<dd><p>Return the bigdecimal primitive value corresponding to <code>this</code>.
</p>
</dd>
<dt><code>toString()</code></dt>
<dd><p>Convert <code>this</code> to a string with infinite precision in base 10.
</p>
</dd>
<dt><code>toPrecision(p, rnd_mode = &quot;half-up&quot;)</code></dt>
<dt><code>toFixed(p, rnd_mode = &quot;half-up&quot;)</code></dt>
<dt><code>toExponential(p, rnd_mode = &quot;half-up&quot;)</code></dt>
<dd><p>Convert the BigDecimal <code>this</code> to string with the specified
precision <code>p</code>. There is no limit on the accepted precision
<code>p</code>. The rounding mode can be optionally
specified. <code>toPrecision</code> outputs either in decimal fixed notation
or in decimal exponential notation with a <code>p</code> digits of
precision. <code>toExponential</code> outputs in decimal exponential
notation with <code>p</code> digits after the decimal point. <code>toFixed</code>
outputs in decimal notation with <code>p</code> digits after the decimal
point.
</p>
</dd>
</dl>
<a name="Math-mode"></a>
<h2 class="chapter">6 Math mode</h2>
<p>A new <em>math mode</em> is enabled with the <code>&quot;use math&quot;</code>
directive. It propagates the same way as the <em>strict mode</em>. It is
designed so that arbitrarily large integers and floating point numbers
are available by default. In order to minimize the number of changes
in the Javascript semantics, integers are represented either as Number
or BigInt depending on their magnitude. Floating point numbers are
always represented as BigFloat.
</p>
<p>The following changes are made to the Javascript semantics:
</p>
<ul>
<li> Floating point literals (i.e. number with a decimal point or an exponent) are <code>BigFloat</code> by default (i.e. a <code>l</code> suffix is implied). Hence <code>typeof 1.0 === &quot;bigfloat&quot;</code>.
</li><li> Integer literals (i.e. numbers without a decimal point or an exponent) with or without the <code>n</code> suffix are <code>BigInt</code> if their value cannot be represented as a safe integer. A safe integer is defined as a integer whose absolute value is smaller or equal to <code>2**53-1</code>. Hence <code>typeof 1 === &quot;number &quot;</code>, <code>typeof 1n === &quot;number&quot;</code> but <code>typeof 9007199254740992 === &quot;bigint&quot; </code>.
</li><li> All the bigint builtin operators and functions are modified so that their result is returned as a Number if it is a safe integer. Otherwise the result stays a BigInt.
</li><li> The builtin operators are modified so that they return an exact result (which can be a BigInt) if their operands are safe integers. Operands between Number and BigInt are accepted provided the Number operand is a safe integer. The integer power with a negative exponent returns a BigFloat as result. The integer division returns a BigFloat as result.
</li><li> The <code>^</code> operator is an alias to the power operator (<code>**</code>).
</li><li> The power operator (both <code>^</code> and <code>**</code>) grammar is modified so that <code>-2^2</code> is allowed and yields <code>-4</code>.
</li><li> The logical xor operator is still available with the <code>^^</code> operator.
</li><li> The modulo operator (<code>%</code>) returns the Euclidian remainder (always positive) instead of the truncated remainder.
</li><li> The integer division operator can be overloaded with <code>Operators.updateBigIntOperators(dictionary)</code>.
</li><li> The integer power operator with a non zero negative exponent can be overloaded with <code>Operators.updateBigIntOperators(dictionary)</code>.
</li></ul>
<div class="footnote">
<hr>
<h4 class="footnotes-heading">Footnotes</h4>
<h3><a name="FOOT1" href="#DOCF1">(1)</a></h3>
<p>The
rationale is that the rounding mode changes must always be
explicit.</p>
<h3><a name="FOOT2" href="#DOCF2">(2)</a></h3>
<p>The rationale is to avoid side effects for the built-in
operators.</p>
<h3><a name="FOOT3" href="#DOCF3">(3)</a></h3>
<p>Base 10 floating point literals cannot usually be
exactly represented as base 2 floating point number. In order to
ensure that the literal is represented accurately with the current
precision, it must be evaluated at runtime.</p>
<h3><a name="FOOT4" href="#DOCF4">(4)</a></h3>
<p>Could be removed in case a deterministic behavior for floating point operations is required.</p>
</div>
<hr>
</body>
</html>

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doc/quickjs.html

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12
doc/quickjs.texi

@ -452,6 +452,16 @@ useful in case of specific memory constraints or for testing.
Return the value of the environment variable @code{name} or
@code{undefined} if it is not defined.
@item setenv(name, value)
Set the value of the environment variable @code{name} to the string
@code{value}.
@item unsetenv(name)
Delete the environment variable @code{name}.
@item getenviron()
Return an object containing the environment variables as key-value pairs.
@item urlGet(url, options = undefined)
Download @code{url} using the @file{curl} command line
@ -532,7 +542,7 @@ position @code{position} (wrapper to the libc @code{fread}).
@item write(buffer, position, length)
Write @code{length} bytes to the file from the ArrayBuffer @code{buffer} at byte
position @code{position} (wrapper to the libc @code{fread}).
position @code{position} (wrapper to the libc @code{fwrite}).
@item getline()
Return the next line from the file, assuming UTF-8 encoding, excluding

918
jscompress.c

@ -1,918 +0,0 @@
/*
* Javascript Compressor
*
* Copyright (c) 2008-2018 Fabrice Bellard
* Copyright (c) 2017-2018 Charlie Gordon
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdlib.h>
#include <stdio.h>
#include <getopt.h>
#include <stdarg.h>
#include <string.h>
#include <inttypes.h>
#include <unistd.h>
#include "cutils.h"
typedef struct JSToken {
int tok;
char buf[20];
char *str;
int len;
int size;
int line_num; /* line number for start of token */
int lines; /* number of embedded linefeeds in token */
} JSToken;
enum {
TOK_EOF = 256,
TOK_IDENT,
TOK_STR1,
TOK_STR2,
TOK_STR3,
TOK_NUM,
TOK_COM,
TOK_LCOM,
};
void tok_reset(JSToken *tt)
{
if (tt->str != tt->buf) {
free(tt->str);
tt->str = tt->buf;
tt->size = sizeof(tt->buf);
}
tt->len = 0;
}
void tok_add_ch(JSToken *tt, int c)
{
if (tt->len + 1 > tt->size) {
tt->size *= 2;
if (tt->str == tt->buf) {
tt->str = malloc(tt->size);
memcpy(tt->str, tt->buf, tt->len);
} else {
tt->str = realloc(tt->str, tt->size);
}
}
tt->str[tt->len++] = c;
}
FILE *infile;
const char *filename;
int output_line_num;
int line_num;
int ch;
JSToken tokc;
int skip_mask;
#define DEFINE_MAX 20
char *define_tab[DEFINE_MAX];
int define_len;
void error(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (filename) {
fprintf(stderr, "%s:%d: ", filename, line_num);
} else {
fprintf(stderr, "jscompress: ");
}
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
va_end(ap);
exit(1);
}
void define_symbol(const char *def)
{
int i;
for (i = 0; i < define_len; i++) {
if (!strcmp(tokc.str, define_tab[i]))
return;
}
if (define_len >= DEFINE_MAX)
error("too many defines");
define_tab[define_len++] = strdup(def);
}
void undefine_symbol(const char *def)
{
int i, j;
for (i = j = 0; i < define_len; i++) {
if (!strcmp(tokc.str, define_tab[i])) {
free(define_tab[i]);
} else {
define_tab[j++] = define_tab[i];
}
}
define_len = j;
}
const char *find_symbol(const char *def)
{
int i;
for (i = 0; i < define_len; i++) {
if (!strcmp(tokc.str, define_tab[i]))
return "1";
}
return NULL;
}
void next(void);
void nextch(void)
{
ch = fgetc(infile);
if (ch == '\n')
line_num++;
}
int skip_blanks(void)
{
for (;;) {
next();
if (tokc.tok != ' ' && tokc.tok != '\t' &&
tokc.tok != TOK_COM && tokc.tok != TOK_LCOM)
return tokc.tok;
}
}
void parse_directive(void)
{
int ifdef, mask = skip_mask;
/* simplistic preprocessor:
#define / #undef / #ifdef / #ifndef / #else / #endif
no symbol substitution.
*/
skip_mask = 0; /* disable skipping to parse preprocessor line */
nextch();
if (skip_blanks() != TOK_IDENT)
error("expected preprocessing directive after #");
if (!strcmp(tokc.str, "define")) {
if (skip_blanks() != TOK_IDENT)
error("expected identifier after #define");
define_symbol(tokc.str);
} else if (!strcmp(tokc.str, "undef")) {
if (skip_blanks() != TOK_IDENT)
error("expected identifier after #undef");
undefine_symbol(tokc.str);
} else if ((ifdef = 1, !strcmp(tokc.str, "ifdef")) ||
(ifdef = 0, !strcmp(tokc.str, "ifndef"))) {
if (skip_blanks() != TOK_IDENT)
error("expected identifier after #ifdef/#ifndef");
mask = (mask << 2) | 2 | ifdef;
if (find_symbol(tokc.str))
mask ^= 1;
} else if (!strcmp(tokc.str, "else")) {
if (!(mask & 2))
error("#else without a #if");
mask ^= 1;
} else if (!strcmp(tokc.str, "endif")) {
if (!(mask & 2))
error("#endif without a #if");
mask >>= 2;
} else {
error("unsupported preprocessing directive");
}
if (skip_blanks() != '\n')
error("extra characters on preprocessing line");
skip_mask = mask;
}
/* return -1 if invalid char */
static int hex_to_num(int ch)
{
if (ch >= 'a' && ch <= 'f')
return ch - 'a' + 10;
else if (ch >= 'A' && ch <= 'F')
return ch - 'A' + 10;
else if (ch >= '0' && ch <= '9')
return ch - '0';
else
return -1;
}
void next(void)
{
again:
tok_reset(&tokc);
tokc.line_num = line_num;
tokc.lines = 0;
switch(ch) {
case EOF:
tokc.tok = TOK_EOF;
if (skip_mask)
error("missing #endif");
break;
case 'a' ... 'z':
case 'A' ... 'Z':
case '_':
case '$':
tok_add_ch(&tokc, ch);
nextch();
while ((ch >= 'a' && ch <= 'z') ||
(ch >= 'A' && ch <= 'Z') ||
(ch >= '0' && ch <= '9') ||
(ch == '_' || ch == '$')) {
tok_add_ch(&tokc, ch);
nextch();
}
tok_add_ch(&tokc, '\0');
tokc.tok = TOK_IDENT;
break;
case '.':
nextch();
if (ch >= '0' && ch <= '9') {
tok_add_ch(&tokc, '.');
goto has_dot;
}
tokc.tok = '.';
break;
case '0':
tok_add_ch(&tokc, ch);
nextch();
if (ch == 'x' || ch == 'X') {
/* hexa */
tok_add_ch(&tokc, ch);
nextch();
while ((ch >= 'a' && ch <= 'f') ||
(ch >= 'A' && ch <= 'F') ||
(ch >= '0' && ch <= '9')) {
tok_add_ch(&tokc, ch);
nextch();
}
tok_add_ch(&tokc, '\0');
tokc.tok = TOK_NUM;
break;
}
goto has_digit;
case '1' ... '9':
tok_add_ch(&tokc, ch);
nextch();
has_digit:
/* decimal */
while (ch >= '0' && ch <= '9') {
tok_add_ch(&tokc, ch);
nextch();
}
if (ch == '.') {
tok_add_ch(&tokc, ch);
nextch();
has_dot:
while (ch >= '0' && ch <= '9') {
tok_add_ch(&tokc, ch);
nextch();
}
}
if (ch == 'e' || ch == 'E') {
tok_add_ch(&tokc, ch);
nextch();
if (ch == '+' || ch == '-') {
tok_add_ch(&tokc, ch);
nextch();
}
while (ch >= '0' && ch <= '9') {
tok_add_ch(&tokc, ch);
nextch();
}
}
tok_add_ch(&tokc, '\0');
tokc.tok = TOK_NUM;
break;
case '`':
{
nextch();
while (ch != '`' && ch != EOF) {
if (ch == '\\') {
tok_add_ch(&tokc, ch);
nextch();
if (ch == EOF) {
error("unexpected char after '\\'");
}
tok_add_ch(&tokc, ch);
} else {
tok_add_ch(&tokc, ch);
nextch();
}
}
nextch();
tok_add_ch(&tokc, 0);
tokc.tok = TOK_STR3;
}
break;
case '\"':
case '\'':
{
int n, i, c, hex_digit_count;
int quote_ch;
quote_ch = ch;
nextch();
while (ch != quote_ch && ch != EOF) {
if (ch == '\\') {
nextch();
switch(ch) {
case 'n':
tok_add_ch(&tokc, '\n');
nextch();
break;
case 'r':
tok_add_ch(&tokc, '\r');
nextch();
break;
case 't':
tok_add_ch(&tokc, '\t');
nextch();
break;
case 'v':
tok_add_ch(&tokc, '\v');
nextch();
break;
case '\"':
case '\'':
case '\\':
tok_add_ch(&tokc, ch);
nextch();
break;
case '0' ... '7':
n =