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134 lines
9.8 KiB
134 lines
9.8 KiB
=========================
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Duktape 1.2 release notes
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=========================
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Release overview
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================
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This release adds debugger support, macro-based script timeout function, and
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performance optimizations. Debugger integration API calls have been added
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(duk_debugger_attach(), duk_debugger_detach(), and duk_debugger_cooperate()).
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Upgrading from Duktape 1.1.x
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============================
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No action (other than recompiling) should be needed to upgrade from Duktape
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v1.1.x.
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There are bug fixes and other minor behavioral changes which may affect some
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applications, see ``RELEASES.rst`` for details.
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Known issues
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============
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This release has the following known issues worth noting.
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ECMAScript features
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-------------------
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* Non-compliant behavior for array indices near 2G or 4G elements.
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* RegExp parser is strict and won't accept some real world RegExps which
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are technically not compliant with ECMAScript E5/E5.1 specification.
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* Final mantissa bit rounding issues in the internal number-to-string
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conversion.
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* If a function contains a lot of constants (over 511 strings or non-integers),
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the compiler fails to compile a try-catch statement. The workaround is to
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place the try-catch in a separate function outside the problematic function.
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Portability and platforms
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-------------------------
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* On some older clang/llvm versions (e.g. Clang 3.3 on FreeBSD 10):
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when ``-m32`` is used, Duktape will end up using the 8-byte packed value
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representation but clang will generate incorrect code for union assignment
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(see ``misc/clang_aliasing.c``). The issue can be detected by defining
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``DUK_OPT_SELF_TESTS``. A workaround is to avoid packed types in this
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case by defining ``DUK_OPT_NO_PACKED_TVAL``.
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* On some older clang/llvm versions (e.g. Clang 3.3 on FreeBSD 10):
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compilation may produce a warning "generic selections are a C11-specific
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feature". The warning should be harmless.
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* On some older clang/llvm versions (e.g. Clang 3.3 on FreeBSD 10):
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harmless compilation warning for "duk_repl_isinf" being unused.
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* On some GCC versions and compilation options you may get a warning
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"variable idx_func might be clobbered by longjmp or vfork [-Wclobbered]".
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This warning seems spurious and causes no known problems.
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* GCC ``-O4`` may produce a warning "assuming signed overflow does not occur
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when assuming that (X - c) > X is always false" for some assertions. This
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warning seems spurious and causes no known problems.
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* GCC ``-pedantic`` without ``-std=c99`` causes the ``unsigned long long``
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type to be used by Duktape, and an associated warning about the type.
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This is harmless and most easily fixed by simply using ``-std=c99``.
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Raw issues from test runs
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=========================
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API tests
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---------
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See ``testcase-known-issues.yaml``::
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test-to-number.c: fail; 15 diff lines; known issue: number parsing bug for strings containing NUL characters (e.g. '\u0000')
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ECMAScript tests
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----------------
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See ``testcase-known-issues.yaml``::
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test-bi-array-proto-push: fail; 30 diff lines; known issue: array length above 2^32-1 not supported
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test-bi-array-push-maxlen: fail; 17 diff lines; known issue: array length above 2^32-1 not supported
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test-bi-date-tzoffset-brute-fi: fail; 12 diff lines; known issue: year 1970 deviates from expected, Duktape uses equiv. year for 1970 on purpose at the moment; requires special feature options: test case has been written for Finnish locale
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test-bi-function-nonstd-caller-prop: fail; 178 diff lines; requires special feature options: DUK_OPT_NONSTD_FUNC_CALLER_PROPERTY
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test-bi-global-parseint-oct: fail; 20 diff lines; known issue: non-standard octal behavior does not match V8/Rhino
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test-bi-global-parseint: fail; 108 diff lines; known issue: rounding differences for parsing integers larger than 2^53
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test-bi-json-dec-types: fail; 21 diff lines; known issue: '\x' should be allowed by eval() but not by JSON.parse(), Duktape rejects '\x' in both
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test-bi-json-enc-proplist-dups: fail; 8 diff lines; known issue: JSON.stringify() can be given a property list to serialize; duplicates should be eliminated but Duktape (and other engines) will happily serialize a property multiple times
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test-bi-number-proto-toexponential: fail; 75 diff lines; known issue: corner case rounding errors in toExponential()
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test-bi-number-proto-tostring: fail; 46 diff lines; known issue: expect strings to be checked, but probably Duktape rounding issues
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test-bi-regexp-gh39: fail; 5 diff lines; known issue: requires leniency for non-standard regexps
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test-bug-enum-shadow-nonenumerable: fail; 12 diff lines; known issue: corner case enumeration semantics, not sure what correct behavior is (test262 ch12/12.6/12.6.4/12.6.4-2)
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test-bug-invalid-oct-as-dec: fail; 14 diff lines; known issue: V8/Rhino parse invalid octal constants as decimal values, Duktape doesn't at the moment
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test-bug-json-parse-__proto__: fail; 18 diff lines; known issue: when ES6 __proto__ enabled, JSON.parse() parses '__proto__' property incorrectly when a specially crafted reviver is used
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test-bug-numconv-1e23: fail; 10 diff lines; known issue: corner case in floating point parse rounding
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test-bug-numconv-denorm-toprec: fail; 7 diff lines; known issue: in a denormal corner case toPrecision() can output a zero leading digit
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test-bug-tonumber-u0000: fail; 7 diff lines; known issue: '\u0000' should ToNumber() coerce to NaN, but now coerces to zero like an empty string
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test-bug-trycatch-many-constants: fail; 5 diff lines; known issue: out of regs for try-catch in functions with a lot of constants
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test-conv-number-tostring-tonumber-roundtrip: fail; 5 diff lines; known issue: rounding corner cases
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test-dev-bound-thread-start-func: fail; 13 diff lines; known issue: initial function of a new coroutine cannot be bound
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test-dev-func-cons-args: fail; 18 diff lines; known issue: corner cases for 'new Function()' when arguments and code are given as strings
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test-dev-lightfunc-accessor: fail; 50 diff lines; requires special feature options: DUK_OPT_LIGHTFUNC_BUILTINS
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test-dev-lightfunc-finalizer: fail; 8 diff lines; requires special feature options: DUK_OPT_LIGHTFUNC_BUILTINS
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test-dev-lightfunc: fail; 462 diff lines; requires special feature options: DUK_OPT_LIGHTFUNC_BUILTINS
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test-dev-yield-after-callapply: fail; 8 diff lines; known issue: yield() not allowed when function called via Function.prototype.(call|apply)()
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test-lex-unterminated-hex-uni-escape: fail; 29 diff lines; known issue: unterminated hex escapes should be parsed leniently, e.g. '\uX' -> 'uX' but Duktape now refuses to parse them
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test-numconv-parse-misc: fail; 12 diff lines; known issue: rounding corner case for 1e+23 (parses/prints as 1.0000000000000001e+23)
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test-numconv-tostring-gen: fail; 279 diff lines; known issue: rounding corner cases in number-to-string coercion
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test-numconv-tostring-misc: fail; 6 diff lines; known issue: rounding corner case, 1e+23 string coerces to 1.0000000000000001e+23
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test-regexp-empty-quantified: fail; 15 diff lines; known issue: a suitable empty quantified (e.g. '(x*)*') causes regexp parsing to terminate due to step limit
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test-regexp-invalid-charclass: fail; 7 diff lines; known issue: some invalid character classes are accepted (e.g. '[\d-z]' and '[z-x]')
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test-regexp-nonstandard-patternchar: fail; 6 diff lines; known issue: other engines allow an unescaped brace to appear literally (e.g. /{/), Duktape does not (which seems correct but is against real world behavior)
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test-stmt-for-in-lhs: fail; 29 diff lines; known issue: for-in allows some invalid left-hand-side expressions which cause a runtime ReferenceError instead of a compile-time SyntaxError (e.g. 'for (a+b in [0,1]) {...}')
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test262
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-------
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See ``test262-status.rst`` and ``test262-known-issues.yaml``. With ECMAScript 6 and Intl module tests removed::
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ch12/12.6/12.6.4/12.6.4-2 in non-strict mode // diagnosed: enumeration corner case issue, see test-bug-enum-shadow-nonenumerable.js
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ch15/15.10/15.10.2/15.10.2.5/S15.10.2.5_A1_T5 in non-strict mode // diagnosed: Duktape bug, matching /(a*)b\1+/ against 'baaaac' causes first capture to match the empty string; the '\1+' part will then use the '+' quantifier over the empty string. As there is no handling to empty quantified now, Duktape bails out with a RangeError.
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ch15/15.10/15.10.2/15.10.2.9/S15.10.2.9_A1_T5 in non-strict mode // diagnosed: Duktape bug, matching /(a*)b\1+/ against 'baaac' causes first capture to be empty, the '\1+' part will then quantify over an empty string leading to Duktape RangeError (there is no proper handling for an empty quantified now)
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ch15/15.4/15.4.4/15.4.4.10/S15.4.4.10_A3_T3 in non-strict mode // diagnosed: probably Duktape bug related to long array corner cases or 'length' sign handling (C typing?)
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ch15/15.4/15.4.4/15.4.4.12/S15.4.4.12_A3_T3 in non-strict mode // diagnosed: probably Duktape bug related to long array corner cases or 'length' sign handling (C typing?)
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ch15/15.4/15.4.4/15.4.4.14/15.4.4.14-5-12 in non-strict mode // diagnosed: Array length over 2G, not supported right now
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ch15/15.4/15.4.4/15.4.4.14/15.4.4.14-5-16 in non-strict mode // diagnosed: Array length over 2G, not supported right now
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ch15/15.4/15.4.4/15.4.4.14/15.4.4.14-9-9 in non-strict mode // diagnosed: a.indexOf(<n>,4294967290) returns -1 for all indices n=2,3,4,5 but is supposed to return 4294967294 for n=2. The cause is long array corner case handling, possibly signed length handling (C typing?)
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ch15/15.4/15.4.4/15.4.4.15/15.4.4.15-5-12 in non-strict mode // diagnosed: probably Duktape bug: long array corner cases (C typing?)
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ch15/15.4/15.4.4/15.4.4.15/15.4.4.15-5-16 in non-strict mode // diagnosed: probably Duktape bug: long array corner cases (C typing?)
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ch15/15.4/15.4.4/15.4.4.15/15.4.4.15-8-9 in non-strict mode // diagnosed: probably Duktape bug: long array corner cases (C typing?)
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