digitalmars.D.bugs - [Issue 4430] New: erroneous matching on specialized template function
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- d-bugmail puremagic.com (12/12) Sep 11 2010 http://d.puremagic.com/issues/show_bug.cgi?id=4430
http://d.puremagic.com/issues/show_bug.cgi?id=4430
Summary: erroneous matching on specialized template function
Product: D
Version: D2
Platform: Other
OS/Version: Windows
Status: NEW
Severity: regression
Priority: P2
Component: DMD
AssignedTo: nobody puremagic.com
ReportedBy: s.d.hammett googlemail.com
---
A bug has been introduced in 2.037 which in some circumstances causes a
specialized template function to be considered a match even when though it
isn't.
I tried to cut it down to a small test case but I didn't succeed,
it must be something to do with a specific instantiation which is causing the
bug.
FWIW:
http://www.sstk.co.uk/spiritd.zip
Compiles fine w/ 2.036
If I can make a smaller test case, I'll update this bug report.
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Jul 06 2010
d-bugmail puremagic.com
http://d.puremagic.com/issues/show_bug.cgi?id=4430
Richard Webb <webby beardmouse.org.uk> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |webby beardmouse.org.uk
PDT ---
You can repro the compile error in the spiritd test app by doing:
/////////
import spiritd.match, spiritd.nil;
void main(string[] args)
{
Match!(nilT) temp;
conv!(Match!(char))(temp);
}
/////////
(you only need the match bits to see the problem, rather than the whole thing).
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Jul 06 2010
http://d.puremagic.com/issues/show_bug.cgi?id=4430
Don <clugdbug yahoo.com.au> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |clugdbug yahoo.com.au
Summary|erroneous matching on |Regression(2.037) erroneous
|specialized template |matching on specialized
|function |template function
Reduced test case:
struct Ghost(T) {}
void bug4430(T)(Ghost!(T) x) {}
void bug4430(T)(Ghost!(int) x) {}
void spirit4430()
{
Ghost!(int) temp;
bug4430!(Ghost!(char))( temp );
}
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Jul 26 2010
http://d.puremagic.com/issues/show_bug.cgi?id=4430
Even further reduced, shows that a class template is not required.
---
struct Ghost {}
void bug4430(T)(int x) {}
void bug4430(T)(Ghost x) {}
void spirit4430()
{
bug4430!(char)( 777 );
}
----
bad.d(53): Error: template instance bug4430!(char) matches more than one
templat
e declaration, bad.d(48):bug4430(T) and bad.d(49):bug4430(T)
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Sep 01 2010
http://d.puremagic.com/issues/show_bug.cgi?id=4430
Don <clugdbug yahoo.com.au> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch, rejects-valid
This bug was triggered by svn commit 273, which was related to opDispatch.
The immediate change was in CallExp::semantic(). Previously, it attempted full
explicit instantiation, and if that failed, it tried partial explicit
instantiation. In this case, the full explicit instantiation was failing
(because there were two candidate templates), and then partial instantiation
succeeded.
After svn 273, it calls needsTypeInference(). If that returns true, it does
partial instantiation, otherwise does full instantiation. In this example, it's
returning false.
There is a situation missing from needsTypeInference(). If there is more than
one candidate template, and they are ALL function templates, and they are ALL
potentially explicitly instantiated, we need to do partial instantiation.
Template.c, needsTypeInference(), around line 4625.
Index: template.c
===================================================================
--- template.c (revision 655)
+++ template.c (working copy)
-4622,6 +4622,7
//printf("TemplateInstance::needsTypeInference() %s\n", toChars());
if (!tempdecl)
tempdecl = findTemplateDeclaration(sc);
+ int multipleMatches = FALSE;
for (TemplateDeclaration *td = tempdecl; td; td = td->overnext)
{
/* If any of the overloaded template declarations need inference,
-4647,9 +4648,14
if (Parameter::dim(fdtype->parameters) &&
(tp || tiargs->dim < td->parameters->dim))
return TRUE;
+ /* If there is more than one function template which matches, we may
need type inference
+ */
+ if (td != tempdecl)
+ multipleMatches = TRUE;
}
//printf("false\n");
- return FALSE;
+ return multipleMatches;
}
void TemplateInstance::semantic2(Scope *sc)
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Sep 01 2010
http://d.puremagic.com/issues/show_bug.cgi?id=4430
Walter Bright <bugzilla digitalmars.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |bugzilla digitalmars.com
Resolution| |FIXED
16:47:38 PDT ---
http://www.dsource.org/projects/dmd/changeset/674
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Sep 11 2010