Gpc

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5400 discussions

gdb types?
by Peter N Lewis 22 Aug '05

22 Aug '05

Given type definitions (in an interface unit) of: SInt32 = Integer attribute( size = 32 ); UInt32 = Cardinal attribute( size = 32 ); gdb gives useless stuff like: Subjectlen=<incomplete type>, Ov=$60fb40, Oc=<unknown type> (Where Subjectlen: SInt32 and Oc: UInt32) Is there any way to have these types complete/known and get gdb to display them? Thanks, Peter. -- <http://www.stairways.com/> <http://download.stairways.com/>

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Compilation error for negative constant on right side of an operation
by Pascal Viandier 17 Aug '05

17 Aug '05

Hi GPC crew, The following sample code does not compile properly with GPC (20050331). Program Real; Var R1, R2 : Real; Begin R1 := 4.21; R2 := R1 * -1.0; WriteLn(R2); End. GPC output: real.pas:6: error: syntax error before `-' The problem occurs with negative integer constants and any operator (+-*/) as well. Strange enough, if I modify the code for: R1 := 4.21; R2 := -1.0; R2 := R1 * R2; Or even for: R2 := -1.0 * R1; The code compiles and the output is as expected. It looks like one can assign a negative constant to a variable but cannot use it as an operand if it is on the right side. This is not a problem for multiplying but for the other operators... Could this be a bug? Thanks Pascal Viandier pascal(a)accovia.com

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Fill string
by Contestcen＠aol.com 17 Aug '05

17 Aug '05

Frank H: > As I said, GPC doesn't check for using undefined values at all. > (Currently, and this isn't going to change soon, as this is not > exactly trivial to implement in general ...) I am with Frank on this. Many years ago, before Pascal existed, I used the Watfor Fortran compiler. This compiler always checked for uninitialized variables. The check was made by initializing all variables to the value 666 according to length (e.g., Boolean variables were set to x'66', fullword integers to x'66666666' and so forth). Every time a value was fetched it was checked for these values. This nearly doubled running times. A bigger problem was that the value 666 sometimes came up naturally in the course of computation. That would abort your run. It took a great deal of tricky programming to prevent this from happening. The alternative method of checking for uninitialized variables is to have a separate set of flags, one for every variable and component of every array and data structure. This not only costs heavily in execution time, it also costs in storage. Switching back and forth from checking On to checking Off might be more complex than simply turning on and off the option. There may be consequences due to having your variables change location. All told, I don't think the check for uninitialized variables is worth the effort. Frank Rubin

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Code generation error?
by Peter N Lewis 16 Aug '05

16 Aug '05

The code which generates a dynamic array on the stack in the middle of a procedure (which I never would have suspected you could do in Pascal) appears to corrupt the stack in a way which makes ReturnAddress(0) either return bogus numbers or crash with a bus error. Or more accurately, assigning to sections of the created array corrupts the stack. I don't know if this is a PowerPC only issue, or applies to other platforms as well. This code: program peter103; uses GPC; procedure Test( ParameterCount: Integer ); var i: Integer; begin WriteLn( StdErr, 'T1 ', ParameterCount, ' ', ReturnAddr2Hex(ReturnAddress (0)) ); var CProcessParameters: array [0 .. ParameterCount + 1] of CString; WriteLn( StdErr, 'T2 ', ParameterCount, ' ', Low(CProcessParameters), ' ', High(CProcessParameters), ' ', ReturnAddr2Hex(ReturnAddress (0)) ); CProcessParameters[0] := nil; for i := 1 to ParameterCount do CProcessParameters[i] := nil; WriteLn( StdErr, 'T3 ', ParameterCount, ' ', Low(CProcessParameters), ' ', High(CProcessParameters), ' ', ReturnAddr2Hex(ReturnAddress (0)) ); end; var i: Integer; begin for i := 0 to 10 do Test( i ); end. will either crash in the last ReturnAddress with a bus error, fail with a range check if ReturnAddress decides to return nil (because ReturnAddr2Hex range checks if passed 0 as a parameter) or return a different bogus number (different to the two previous addresses). I discovered this as it affects Pipe in pipes.pas which is used by gp. The code for the creation of CProcessParameters is: lwz r2,12520(r30) addi r2,r2,1 stw r2,12448(r30) lwz r0,12448(r30) cmpwi cr7,r0,0 bge cr7,L5 bl L__p_SubrangeError$stub L5: lwz r0,12448(r30) slwi r2,r0,2 addi r2,r2,4 stw r1,12452(r30) addi r2,r2,15 addi r0,r2,15 srwi r0,r0,4 slwi r0,r0,4 lwz r2,0(r1) neg r0,r0 stwux r2,r1,r0 addi r2,r1,56 addi r0,r2,15 srwi r0,r0,4 slwi r2,r0,4 stw r2,12456(r30) I'm afraid this taxes my PPC decoding and ABI abilities past the limits, so I can't actually tell where the problem in the code is. Moving the definition of CProcessParameters into the variable section does not change the behaviour. Could someone try duplicating this Linux or Windows perhaps to see if it is PPC only, or can anyone read enough PPC to figure out if the code is correct or not? I'll keep trying to pin down exactly what is wrong... Thanks, Peter. -- <http://www.stairways.com/> <http://download.stairways.com/>

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Re: can't get dbx to find lines
by Tom Schneider 15 Aug '05

15 Aug '05

Adriaan: > Did you try the addr2line utility (mentioned in a previous email) ? Or > run the program under control of gdb and then use the 'bt' command to > list a backtrace when it crashes. Thanks! That did the trick! Tom Dr. Thomas D. Schneider National Institutes of Health National Cancer Institute Center for Cancer Research Nanobiology Program Molecular Information Theory Group Frederick, Maryland 21702-1201 toms(a)ncifcrf.gov permanent email: toms(a)alum.mit.edu (use only if first address fails) http://www.ccrnp.ncifcrf.gov/~toms/

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Error message bug
by Prof. Harley Flanders 15 Aug '05

15 Aug '05

Code lines 246 Writeln(OutFile, Copy(TempStr, 1, K - 1); 247 Writeln(OutFile, S1); Error message: pubtotex\pubtotex.pas:247: missing comma pubtotex\pubtotex.pas: In procedure `Pass1': The actual error is a missing ) on line 246 -- =========================================== Prof. Harley Flanders 3533 Windemere Court Ann Arbor, MI 48105-2867 Home: 734 668 1546 harley(a)umich.edu ===========================================

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delay in daily digest postings?
by Tom Schneider 15 Aug '05

15 Aug '05

Hi - I put a message to GPC a while ago and some kind people responded, as I could find them in the archive. But my message and the response has not appeared on the daily digests. It seems that the daily digests are still for July! Regards, Tom Dr. Thomas D. Schneider National Institutes of Health National Cancer Institute Center for Cancer Research Nanobiology Program Molecular Information Theory Group Frederick, Maryland 21702-1201 toms(a)ncifcrf.gov permanent email: toms(a)alum.mit.edu (use only if first address fails) http://www.ccrnp.ncifcrf.gov/~toms/

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Dynamic arrays
by Prof. Harley Flanders 15 Aug '05

15 Aug '05

{ This program compiles and runs with Free Pascal. See GPC compile error below. Apparently GPC doesn't line "array of string" although it doesn't choke on the declaration } program Test; var A: array of string; begin SetLength(A, 10); // Compilation fails on previous line: // pubtotex\test.pas:6: undeclared identifier `A' (first use in this routine) A[3] := 'Hello World'; Writeln(A[3]); Readln; end. -- =========================================== Prof. Harley Flanders 3533 Windemere Court Ann Arbor, MI 48105-2867 Home: 734 668 1546 harley(a)umich.edu ===========================================

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list downtime due to server upgrade
by Anja Gerwinski 12 Aug '05

12 Aug '05

Hello all, we are going to upgrade our server to faster hardware today. This means that the gpc mailing list and the GNU Pascal server (gnu-pascal.de) will be down for about an hour this afternoon. Best wishes, Anja

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GPC integration Kit for Apple's Xcode IDE
by Adriaan van Os 12 Aug '05

12 Aug '05

Available for download from <http://www.microbizz.nl/gpc.html> is the GNU Pascal Xcode integration Kit for Apple's Xcode IDE. Screendumps can be found at <http://www.microbizz.nl/gpcxcode.html>. The Xcode Kit includes demo programs, Pascal source file icons, a compiler update and project templates for Mac OS X for: * applications * application packages * application packages with nib files * command line tools * portable command line tools * dynamic libraries * frameworks * bundle files * loadable bundle packages * relocatable object files * static archive libraries Release notes are included in the package. Regards, Adriaan van Os P.S. A remaining (known (but annoying)) problem while debugging is the wrong-line (one-line-offset) problem.

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