Pike-devel February 2013

pike-devel@lists.lysator.liu.se

2 participants
6 discussions

debugger opcodes
by Bill Welliver 31 Oct '14

31 Oct '14

I noticed that folks have been working on code generation lately. Any chance it might be possible to implement some of the opcodes required to get debugging working (step, break, etc)? I seem to recall someone indicating it wasn't a terribly difficult task, but it's clearly beyond my understanding of the problem. Bill

4 6

Sql.pgsql behavior in case of errors
by aldem-pikedev＠aldem.net 21 Aug '14

21 Aug '14

Hi everyone, I am preparing to use Postgres in my app, found the following strange behavior: ---snip--- Sql.Sql db = Sql.Sql("pgsql://localhost", "test", "test", "test"); db->query("BEGIN"); db->query("INSERT INTO requests (SvTrId) VALUES ('lala')"); catch(db->query("INSERT INTO requests (SvTrId) VALUES ('lala')")); db->query("INSERT INTO requests (SvTrId) VALUES ('juju')"); db->query("ROLLBACK"); ---snip--- Database is opened, row with 'lala' is inserted, second query (obviously) fails as SvTrId is the primary key, but row with 'juju' is inserted *and* appears in the database - i.e. the transaction is *committed*! Studying source code show, that once error is encounter, session is reset, i.e. running transaction is rolled back, everything is closed, temporary tables are deleted and session variables are reset as well, and after that, the next statement(s) will be committed immediately, as there is no active transaction. In my opinion, this is not exactly correct behavior when statement fails, as session still may be needed (especially temporary tables, open cursors etc). Im some cases, this is perfectly normal when SQL statement fails, especially in SERIALIZED transaction isolation level, and it would be more practical to leave the decision as of what to do to the application. Yes, this is true that it is impossible to continue executing statements in failed transaction, but temporary tables etc. may still be needed. Also, silent reconnection is not a good idea too - when there are many transactional statements are executed - it would be nice to have an option to modify this behavior. Best regards, /Alexander

5 6

Google Protocol Buffers
by Jonas Walld�n ＠ Pike developers forum 01 Mar '13

01 Mar '13

One of our customers asked about Pike support for Google Protocol Buffers [1]. I wasn't aware of that standard before but apparently it's been incorporated into a wide variety of languages [2]. Has anyone here experimented with it, and perhaps prototyped a Pike version? [1] https://developers.google.com/protocol-buffers/ [2] http://code.google.com/p/protobuf/wiki/ThirdPartyAddOns

2 1

hex2int
by Martin Nilsson (Opera Mini - AFK!) ＠ Pike (-) developers forum 20 Feb '13

20 Feb '13

One of our developers just did a hex string to int conversion with array_sscanf(x, "%x")[0]. Since we have int2hex, string2hex and hex2string I thought it would be symmetric to add a hex2int function as well. However doing it with /*! @decl int hex2int(string hex) *! @appears String.hex2int *! *! Convert a string of hexadecimal digits to an integer. *! *! @seealso *! @[int2hex()] */ PMOD_EXPORT PIKEFUN int hex2int(string hex) errname String.hex2int; optflags OPT_TRY_OPTIMIZE; { int r=0; unsigned char *q = (unsigned char *)hex->str; int len = hex->len; if(hex->size_shift) Pike_error("Only hex digits allowed.\n"); for (; len; len--) { r <<= 4; r |= hexdecode[*q++]; } RETURN r; } was about twice as slow as the array_sscanf approach. Is that because some special sscanf handling?

3 5

sscanf problem with %-F
by H. William Welliver III 19 Feb '13

19 Feb '13

I've noticed a problem with little endian float parsing in sscanf(): Pike v7.9 release 5 running Hilfe v3.5 (Incremental Pike Frontend) > string f = sprintf("%-8F", 3.25); > float z; > sscanf(f, "%-8F", z); (1) Result: 1 > z; (2) Result: 1.29642825468743e-320 The problem exists in 7.8.700 as well, but not 7.6.128.

3 3

Grammar questions
by Martin Nilsson (Opera Mini - AFK!) ＠ Pike (-) developers forum 14 Feb '13

14 Feb '13

Two grammar questions. Why do we need ; after named lambda definition? Is it possible to make soft casts work on typedef:ed types?

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Pike-devel February 2013