Displaying 7 results from an estimated 7 matches for "ispointertype".
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2011 Dec 05
0
[LLVMdev] tbaa
...may alias, Mod/Ref Pointers: (i32* %1, 4),
(i32* %x, 4), (i32** %p, 8), (i32** %q, 8), (float* %z, 4), (float** %t,
8), (i32* %2, 4)
I guess it is because of the way how TBAA alias analysis treats pointers.
See file: tools/clang/lib/CodeGen/CodeGenTBAA.cpp, line 147&148
147 if (Ty->isPointerType())
148 return MetadataCache[Ty] = getTBAAInfoForNamedType("any pointer",
149 getChar());
For any pointer, no matter which object it points to, TBAA will generate
the same type of tbaa metadata, which is called "any p...
2011 Dec 05
2
[LLVMdev] tbaa
Duncan Sands <baldrick <at> free.fr> writes:
>
> Hi Yi,
>
> > Could anyone tell me how exactly do I use "Type Based Alias Analysis"?
> >
> > I compiled the C program with Clang, and verified that there is tbaa
> > metadata in the IR code.
> >
> > But then when I use "opt -tbaa input.c.bc -aa-eval" to check the results,
2006 May 17
2
[LLVMdev] Re: __main() function and AliasSet
...>getType();
if (const PointerType *PTy = dyn_cast<PointerType>(ArgTy))
N->mergeTypeInfo(PTy->getElementType(), H.getOffset());
}
}
for (; AI != E; ++AI) {
// printf reads all pointer arguments.
if (isPointerType((*AI)->getType()))
if (DSNode *N = getValueDest(**AI).getNode())
N->setReadMarker();
}
-----------------------------
So from my point of view, the ds-aa thinks "printf reads all pointer arguments",
but does not take into account the "%n&...
2006 May 17
0
[LLVMdev] Re: __main() function and AliasSet
...F->getName() == "fprintf" ||
> F->getName() == "sprintf") {
> CallSite::arg_iterator AI = CS.arg_begin(), E = CS.arg_end();
...
> for (; AI != E; ++AI) {
> // printf reads all pointer arguments.
> if (isPointerType((*AI)->getType()))
> if (DSNode *N = getValueDest(**AI).getNode())
> N->setReadMarker();
> }
> -----------------------------
> So from my point of view, the ds-aa thinks "printf reads all pointer arguments",
Right.
> but does...
2011 Dec 06
3
[LLVMdev] tbaa
...i32* %1, 4),
> (i32* %x, 4), (i32** %p, 8), (i32** %q, 8), (float* %z, 4), (float** %t,
> 8), (i32* %2, 4)
>
> I guess it is because of the way how TBAA alias analysis treats pointers.
> See file: tools/clang/lib/CodeGen/CodeGenTBAA.cpp, line 147&148
>
> 147 if (Ty->isPointerType())
> 148 return MetadataCache[Ty] = getTBAAInfoForNamedType("any pointer",
> 149 getChar());
>
> For any pointer, no matter which object it points to, TBAA will generate
> the same type of tbaa metadata, which...
2006 May 15
0
[LLVMdev] Re: __main() function and AliasSet
On Mon, 15 May 2006, Nai Xia wrote:
> In other words, if I only use -steens-aa and the data_XXXs are all
> external global variables( and so inComplete ),
Sounds right!
> the call to printf will
> make the same effect, which I have tested it.
>
> Am I right ? :)
If you've tested it then, yes you're right :). I haven't played with this
stuff for a long time,
2006 May 15
2
[LLVMdev] Re: __main() function and AliasSet
Hi Chris,
I took a haste look at the "Points-to Analysis in Almost Linear Time" by Steens , your PHD thesis
and SteensGaard.cpp in LLVM this afternoon.
So I think:
1. Actually the basic algorithm described originally by SteensGaard does not provide MOD/REF information for functions.
2. The context insensitive part of Data Structure Analysis (LocalAnalysis) can be deemed as
an