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RE: Classpath build process and VM-specific issues
From: |
Andrew Haley |
Subject: |
RE: Classpath build process and VM-specific issues |
Date: |
Tue, 6 Apr 2004 10:19:41 +0100 |
David Holmes writes:
> Well if we're being pedantic and imprecise to boot ...
>
> > >> malloc() returns a char*, not a jbyte*.
>
> malloc() returns void* not char*. It hasn't returned char* since pre ANSI C.
True, yes.
> Hence the pointer returned by malloc can be legally converted to any real
> pointer type with clearly defined semantics.
> Taking the address of a void* and pretending that it is the address of a
> jbyte* is not legal. However, it is legal to convert between an int and a
> pointer type and a pointer type and an int. If the address represented by
> the int is incorrectly aligned for the pointer type then the result is
> undefined. Otherwise the result is implementation specific. Hence you can
> write legal but (by definition) non-portable code to do what you want.
No, because of aliasing rules. You can't convert a pointer between
two types that are not character types and then dereference it.
Andrew.
- Re: Classpath build process and VM-specific issues, (continued)
- Re: Classpath build process and VM-specific issues, Andrew Haley, 2004/04/05
- Re: Classpath build process and VM-specific issues, Etienne Gagnon, 2004/04/05
- Re: Classpath build process and VM-specific issues, Andrew Haley, 2004/04/05
- Re: Classpath build process and VM-specific issues, Etienne Gagnon, 2004/04/05
- Re: Classpath build process and VM-specific issues, Andrew Haley, 2004/04/05
- Re: Classpath build process and VM-specific issues, Archie Cobbs, 2004/04/05
- Re: Classpath build process and VM-specific issues, Andrew Haley, 2004/04/05
- Re: Classpath build process and VM-specific issues, Etienne Gagnon, 2004/04/05
- Re: Classpath build process and VM-specific issues, Etienne Gagnon, 2004/04/05
- RE: Classpath build process and VM-specific issues, David Holmes, 2004/04/05
- RE: Classpath build process and VM-specific issues,
Andrew Haley <=
- Re: Classpath build process and VM-specific issues, Etienne Gagnon, 2004/04/05
- Re: Classpath build process and VM-specific issues, Andrew Haley, 2004/04/06
- Re: Classpath build process and VM-specific issues, Steven Augart, 2004/04/06
- Re: Classpath build process and VM-specific issues, Andrew Haley, 2004/04/06
- Re: Classpath build process and VM-specific issues, Etienne Gagnon, 2004/04/06
- Re: Classpath build process and VM-specific issues, David Lichteblau, 2004/04/06
- Re: Classpath build process and VM-specific issues, Andrew Haley, 2004/04/07
- Re: Classpath build process and VM-specific issues, David P Grove, 2004/04/07
- Re: Classpath build process and VM-specific issues, Etienne Gagnon, 2004/04/07
- Re: Classpath build process and VM-specific issues, Andrew Haley, 2004/04/07