digitalmars.D.bugs - [Issue 1199] New: Strange error messages when indexing empty arrays or strings at compile time
- d-bugmail puremagic.com (26/26) Apr 28 2007 http://d.puremagic.com/issues/show_bug.cgi?id=1199
- d-bugmail puremagic.com (9/9) Jul 01 2007 http://d.puremagic.com/issues/show_bug.cgi?id=1199
- d-bugmail puremagic.com (10/10) Jul 02 2007 http://d.puremagic.com/issues/show_bug.cgi?id=1199
- d-bugmail puremagic.com (14/14) Jul 02 2007 http://d.puremagic.com/issues/show_bug.cgi?id=1199
- d-bugmail puremagic.com (6/6) Jul 02 2007 http://d.puremagic.com/issues/show_bug.cgi?id=1199
- d-bugmail puremagic.com (9/9) Jul 02 2007 http://d.puremagic.com/issues/show_bug.cgi?id=1199
- d-bugmail puremagic.com (15/15) Jul 02 2007 http://d.puremagic.com/issues/show_bug.cgi?id=1199
- d-bugmail puremagic.com (5/5) Jul 02 2007 http://d.puremagic.com/issues/show_bug.cgi?id=1199
- d-bugmail puremagic.com (9/9) Jul 02 2007 http://d.puremagic.com/issues/show_bug.cgi?id=1199
- d-bugmail puremagic.com (14/20) Jul 03 2007 http://d.puremagic.com/issues/show_bug.cgi?id=1199
- d-bugmail puremagic.com (9/9) Jul 30 2007 http://d.puremagic.com/issues/show_bug.cgi?id=1199
http://d.puremagic.com/issues/show_bug.cgi?id=1199
Summary: Strange error messages when indexing empty arrays or
strings at compile time
Product: D
Version: 1.011
Platform: PC
OS/Version: Windows
Status: NEW
Keywords: diagnostic
Severity: trivial
Priority: P3
Component: DMD
AssignedTo: bugzilla digitalmars.com
ReportedBy: deewiant gmail.com
// Error: non-constant expression [][__dollar - 1u]
char a = (cast(char[])[])[$-1];
Using an immediate value like 0 in place of $-1 gives the sensible message
explaining that the index is out of bounds.
// Error: string index 4294967295 is out of bounds [0 .. 17540474638172160]
char b = ""[$-1];
Doesn't help here, though:
// Error: string index 0 is out of bounds [0 .. 17540474638172160]
char c = ""[0];
// Ditto
char d = ""[$];
--
Apr 28 2007
d-bugmail puremagic.com
http://d.puremagic.com/issues/show_bug.cgi?id=1199
bugzilla digitalmars.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
------- Comment #1 from bugzilla digitalmars.com 2007-07-01 13:29 -------
Fixed DMD 1.018 and DMD 2.002
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Jul 01 2007
http://d.puremagic.com/issues/show_bug.cgi?id=1199
deewiant gmail.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |
------- Comment #2 from deewiant gmail.com 2007-07-02 07:33 -------
The latter two cases still claim that 0 is out of bounds of 0..(big number)
(should be 0..0), and in all four cases the error message is output twice.
--
Jul 02 2007
http://d.puremagic.com/issues/show_bug.cgi?id=1199
bugzilla digitalmars.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution| |INVALID
------- Comment #3 from bugzilla digitalmars.com 2007-07-02 12:03 -------
1) 0 is out of bounds in an array of length 0. You cannot access the first
element of a 0 length array, and [0] accesses the first element.
2) The big number is -1 as a size_t. Array indices are implicitly converted to
size_t.
3) Cascaded error messages are often not very helpful, but they aren't bugs in
the compiler.
--
Jul 02 2007
http://d.puremagic.com/issues/show_bug.cgi?id=1199 ------- Comment #4 from deewiant gmail.com 2007-07-02 14:01 ------- My point was: why do ""[0] and ""[$] generate an error talking about 0 out of bounds of [0 .. 43730463654674432] instead of [0 .. 0]? And that number definitely isn't cast(size_t)-1, it doesn't even fit in a 32-bit integer. --
Jul 02 2007
http://d.puremagic.com/issues/show_bug.cgi?id=1199 ------- Comment #5 from bugzilla digitalmars.com 2007-07-02 15:20 ------- For the last 2 cases, I get: test2.d(2): Error: string index 0 is out of bounds [0 .. 0] test2.d(2): Error: string index 0 is out of bounds [0 .. 0] test2.d(5): Error: string index 0 is out of bounds [0 .. 0] test2.d(5): Error: string index 0 is out of bounds [0 .. 0] which, while redundant, is correct. --
Jul 02 2007
http://d.puremagic.com/issues/show_bug.cgi?id=1199
deewiant gmail.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|INVALID |
------- Comment #6 from deewiant gmail.com 2007-07-02 22:57 -------
I'm running 1.018 and get:
asdf.d(2): Error: string index 0 is out of bounds [0 .. 43730721352712192]
asdf.d(2): Error: string index 0 is out of bounds [0 .. 43730721352712192]
asdf.d(5): Error: string index 0 is out of bounds [0 .. 43730721352712192]
asdf.d(5): Error: string index 0 is out of bounds [0 .. 43730721352712192]
With -inline or -release thrown, it's 43730772892319744 instead, and with both
thrown it's 43730824431927296.
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Jul 02 2007
http://d.puremagic.com/issues/show_bug.cgi?id=1199 ------- Comment #7 from bugzilla digitalmars.com 2007-07-02 23:18 ------- Please post exactly what the source file you're running is and the switches used. --
Jul 02 2007
http://d.puremagic.com/issues/show_bug.cgi?id=1199 ------- Comment #8 from deewiant gmail.com 2007-07-02 23:28 ------- Same as the original: char c = ""[0]; char d = ""[$]; "dmd asdf" leads to the errors I mentioned. "dmd asdf -inline", "dmd asdf -release", and "dmd asdf -inline -release" change the ending index in the error message. --
Jul 02 2007
http://d.puremagic.com/issues/show_bug.cgi?id=1199 ------- Comment #9 from onlystupidspamhere yahoo.se 2007-07-03 02:08 ------- (In reply to comment #8)char c = ""[0]; char d = ""[$]; "dmd asdf" leads to the errors I mentioned. "dmd asdf -inline", "dmd asdf -release", and "dmd asdf -inline -release" change the ending index in the error message.I can confirm this. I'm using DMD 1.018 and latest Tango on Linux. Here's the output of dmd -v -c b1199.d: parse b1199 semantic b1199 import object (/home/jm/d/tango/object.di) semantic2 b1199 b1199.d(1): Error: string index 0 is out of bounds [0 .. 582418249900097536] b1199.d(1): Error: string index 0 is out of bounds [0 .. 582419830448062464] b1199.d(2): Error: string index 0 is out of bounds [0 .. 582418249900097536] b1199.d(2): Error: string index 0 is out of bounds [0 .. 582421617154457600] --
Jul 03 2007
http://d.puremagic.com/issues/show_bug.cgi?id=1199
bugzilla digitalmars.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution| |FIXED
------- Comment #10 from bugzilla digitalmars.com 2007-07-30 15:54 -------
Fixed DMD 1.019 and 2.003
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Jul 30 2007