Hello everyone !
I followed
http://stackoverflow.com/questions/4976298/modern-equivalent-of-llvm-annotationmanagerin
order to get annotations from my target bytecode. All the examples
that
I give in the following is related to the code from that link. I have
`__attribute__((annotate("DS"))) int f=0;` into the target C++ program
and
the related IR code:
@.str = private unnamed_addr constant [3 x i8] c"DS\00", section
"llvm.metadata"
@llvm.global.annotations = appending global [1 x { i8*, i8*, i8*, i32
}] [{ i8*, i8*, i8*, i32 } { i8* bitcast (i32* @f to i8*), i8*
getelementptr inbounds ([3 x i8]* @.str, i32 0, i32 0), i8* getelementptr
inbounds ([9 x i8]* @.str1, i32 0, i32 0), i32 18 }], section
"llvm.metadata"
I have two problems following the examples from
http://stackoverflow.com/questions/4976298/modern-equivalent-of-llvm-annotationmanager:
1. Cannot use `annotatedValue->getUnderlyingObject()` since Value class has
not this method. Instead, I found in LLVM the following methods:
`llvm::GetUnderlyingObject()`,`getUnderlyingObjectFromInt(),
getUnderlyingObjects()`.
I hacked the method `llvm::GetUnderlyingObject()`...that is with Capital G
(different from `getUnderlyingObject()`) and call
`myGetUnderlyingObject(annotatedValue,0,6)` as mentioned at
http://llvm.org/docs/doxygen/html/namespacellvm.html#ace6c957db39858291c6ce01c38e78480.
2. Since I write my code into runOnFunction(), I have problems with
`getGlobalVariableString(std::string name)` function from the stackoverflow
link. So I have to integrate the following part of code into
runOnFunction():
std::string name = gv->getName().str();
// assumption: the zeroth operand of a Value::GlobalVariableVal is the
actual Value
//Module* module = ; //can I use Module& llvm::CallGraph::getModule() ?
Value *v = module->getNamedValue(name)->getOperand(0);
if(v->getValueID() == Value::ConstantArrayVal)
{
ConstantArray *ca = (ConstantArray *)v;
std::cout << " argument " <<
a->getType()->getDescription() << "
"<<a->getName().str()
<< " has annotation \"" <<
ca->getAsString() << "\"\n";
}
Is there an easier way to get the simple DS annotation of @f ?
Thank you for any suggestion!
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Hi Alexandru, On 02/27/2013 03:15 PM, Alexandru Ionut Diaconescu wrote:> [...] > Is there an easier way to get the simple DS annotation of @f ? >I used to annotate C / C++ functions with e.g. __attribute__((annotate("kernel"))) and the retrieved the name of the function with the following code: /*****************************************************/ GlobalValue *gv; Value *a = gv->getOperand(0); ConstantStruct *annoStruct dynamic_cast<ConstantStruct>( dynamic_cast<ConstantArray>(a)->getOperand(0); ); GlobalVariable *gvar = dynamic_cast<GlobalVariable>( dynamic_cast<ConstantExpr>( annoStruct->getOperand(1) )->getOperand(0) ); std::string str = dynamic_cast<ConstantDataArray>( gvar->getOperand(0) )->getAsString(); if (str.find("kernel")) { [...] } /*****************************************************/ Inside the last if one can find the function that belongs to the annotation. IMO its a bit ugly, but it works for me ;) Cheers, Sebastian -- Mit freundlichen Grüßen / Kind regards Sebastian Dreßler Zuse Institute Berlin (ZIB) Takustraße 7 D-14195 Berlin-Dahlem Germany dressler at zib.de Phone: +49 30 84185-261 http://www.zib.de/
Hi Sebastian, Thanks for the response. I already did this : I cast the entire annotated expression to Value*. Then, in order to avoid ugly things like getAsString(), I check if V->getValueID() =Value::ConstantArrayVal in order to cast it to ConstantArray. Because it contains only array[0], I cast array0>getOperand(0) to ConstantStruct. Therefore, from ConstantStruct you can get all the four operands. Now, as a TODO, is only to get the names of @f, @str from every field. But right now I have only a small step to do. ConstantStruct->getOperand(0) gives me i8* bitcast (i32* @f to i8*) . Do you know how I can get the name @f from this? I cannot convert it again to ConstantStruct and follow the same procedure, it will give me a segfault. Thank you again. Your advice was very helpful :) On Fri, Mar 1, 2013 at 9:22 AM, Sebastian Dreßler <dressler at zib.de> wrote:> Hi, > > On 02/28/2013 03:55 PM, Alexandru Ionut Diaconescu wrote: > > Hi Sebastian, > > > > I think I am very close to get the annotation, but I need to parse a > > Value*, which is of type {[1 x { i8*, i8*, i8*, i32 }]. In one of those > > fields is the variable that I'm interested into and the string keeping > the > > annotation. But I don't know how to parse .... use_begin() gives me the > > same Value*....do you know how I can parse inside the element? > > > > This is an Array Type (http://llvm.org/docs/LangRef.html#array-type) > which contains a struct. I assume, that you could cast to ConstantArray > which is a Value and then use getOperand(0) and cast its result to > ConstantStruct, like I've done in the sample code. Then you have the > struct and you can traverse it further. > > > Cheers, > Sebastian > > > Thank you :) ! > > > > > > > > > > > > On Wed, Feb 27, 2013 at 4:44 PM, Alexandru Ionut Diaconescu < > > alexandruionutdiaconescu at gmail.com> wrote: > > > >> Hi Sebastian, > >> > >> Thank you for the dummy file. I will try to understand and use it. I > guess > >> I have some problems with C++11. If I cannot solve by simple "parsing" > my > >> code for @llvm.global.annotations, I will ask you again. > >> > >> Cheers, > >> Alex > >> > >> > >> On Wed, Feb 27, 2013 at 4:34 PM, Sebastian Dreßler <dressler at zib.de > >wrote: > >> > >>> Hi Alexandru, > >>> > >>> On 02/27/2013 04:20 PM, Alexandru Ionut Diaconescu wrote: > >>>> [...] > >>>> Do you have a larger piece of code (maybe you have some dummy/test > >>>> examples) from your previous work with annotations? It would be very > >>> useful > >>>> :D > >>>> > >>> > >>> I've attached an example. But please be aware of: > >>> > >>> 1. It uses C++11 and cast (previously I simply replaced cast<> with > >>> dynamic_cast<> which does not seem to work everywhere, so sorry for > that). > >>> > >>> 2. assert is not used in the style as it should be used, so pleas do > not > >>> adopt this style. > >>> > >>> > >>> If some things are still unclear, keep asking ;) > >>> > >>> Cheers, > >>> Sebastian > >>> > >>> > >>> -- > >>> Mit freundlichen Grüßen / Kind regards > >>> > >>> Sebastian Dreßler > >>> > >>> Zuse Institute Berlin (ZIB) > >>> Takustraße 7 > >>> D-14195 Berlin-Dahlem > >>> Germany > >>> > >>> dressler at zib.de > >>> Phone: +49 30 84185-261 > >>> > >>> http://www.zib.de/ > >>> > >> > >> > >> > >> -- > >> Best regards, > >> Alexandru Ionut Diaconescu > >> > > > > > > > > > -- > Mit freundlichen Grüßen / Kind regards > > Sebastian Dreßler > > Zuse Institute Berlin (ZIB) > Takustraße 7 > D-14195 Berlin-Dahlem > Germany > > dressler at zib.de > Phone: +49 30 84185-261 > > http://www.zib.de/ >-- Best regards, Alexandru Ionut Diaconescu -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130301/487c7be4/attachment.html>
Hi, I solved it. From the ConstantStruct you can call getOperand() multiple times, so "mine" as deep as you can. On Fri, Mar 1, 2013 at 1:41 PM, Alexandru Ionut Diaconescu < alexandruionutdiaconescu at gmail.com> wrote:> > Hi Sebastian, > > Thanks for the response. > > I already did this : > > I cast the entire annotated expression to Value*. Then, in order to avoid > ugly things like getAsString(), I check if V->getValueID() => Value::ConstantArrayVal in order to cast it to ConstantArray. Because it > contains only array[0], I cast array0>getOperand(0) to ConstantStruct. > Therefore, from ConstantStruct you can get all the four operands. Now, as > a TODO, is only to get the names of @f, @str from every field. > > But right now I have only a small step to do. > ConstantStruct->getOperand(0) gives me i8* bitcast (i32* @f to i8*) . Do > you know how I can get the name @f from this? I cannot convert it again to > ConstantStruct and follow the same procedure, it will give me a segfault. > > Thank you again. Your advice was very helpful :) > > > > On Fri, Mar 1, 2013 at 9:22 AM, Sebastian Dreßler <dressler at zib.de> wrote: > >> Hi, >> >> On 02/28/2013 03:55 PM, Alexandru Ionut Diaconescu wrote: >> > Hi Sebastian, >> > >> > I think I am very close to get the annotation, but I need to parse a >> > Value*, which is of type {[1 x { i8*, i8*, i8*, i32 }]. In one of those >> > fields is the variable that I'm interested into and the string keeping >> the >> > annotation. But I don't know how to parse .... use_begin() gives me the >> > same Value*....do you know how I can parse inside the element? >> > >> >> This is an Array Type (http://llvm.org/docs/LangRef.html#array-type) >> which contains a struct. I assume, that you could cast to ConstantArray >> which is a Value and then use getOperand(0) and cast its result to >> ConstantStruct, like I've done in the sample code. Then you have the >> struct and you can traverse it further. >> >> >> Cheers, >> Sebastian >> >> > Thank you :) ! >> > >> > >> > >> > >> > >> > On Wed, Feb 27, 2013 at 4:44 PM, Alexandru Ionut Diaconescu < >> > alexandruionutdiaconescu at gmail.com> wrote: >> > >> >> Hi Sebastian, >> >> >> >> Thank you for the dummy file. I will try to understand and use it. I >> guess >> >> I have some problems with C++11. If I cannot solve by simple "parsing" >> my >> >> code for @llvm.global.annotations, I will ask you again. >> >> >> >> Cheers, >> >> Alex >> >> >> >> >> >> On Wed, Feb 27, 2013 at 4:34 PM, Sebastian Dreßler <dressler at zib.de >> >wrote: >> >> >> >>> Hi Alexandru, >> >>> >> >>> On 02/27/2013 04:20 PM, Alexandru Ionut Diaconescu wrote: >> >>>> [...] >> >>>> Do you have a larger piece of code (maybe you have some dummy/test >> >>>> examples) from your previous work with annotations? It would be very >> >>> useful >> >>>> :D >> >>>> >> >>> >> >>> I've attached an example. But please be aware of: >> >>> >> >>> 1. It uses C++11 and cast (previously I simply replaced cast<> with >> >>> dynamic_cast<> which does not seem to work everywhere, so sorry for >> that). >> >>> >> >>> 2. assert is not used in the style as it should be used, so pleas do >> not >> >>> adopt this style. >> >>> >> >>> >> >>> If some things are still unclear, keep asking ;) >> >>> >> >>> Cheers, >> >>> Sebastian >> >>> >> >>> >> >>> -- >> >>> Mit freundlichen Grüßen / Kind regards >> >>> >> >>> Sebastian Dreßler >> >>> >> >>> Zuse Institute Berlin (ZIB) >> >>> Takustraße 7 >> >>> D-14195 Berlin-Dahlem >> >>> Germany >> >>> >> >>> dressler at zib.de >> >>> Phone: +49 30 84185-261 >> >>> >> >>> http://www.zib.de/ >> >>> >> >> >> >> >> >> >> >> -- >> >> Best regards, >> >> Alexandru Ionut Diaconescu >> >> >> > >> > >> > >> >> >> -- >> Mit freundlichen Grüßen / Kind regards >> >> Sebastian Dreßler >> >> Zuse Institute Berlin (ZIB) >> Takustraße 7 >> D-14195 Berlin-Dahlem >> Germany >> >> dressler at zib.de >> Phone: +49 30 84185-261 >> >> http://www.zib.de/ >> > > > > -- > Best regards, > Alexandru Ionut Diaconescu >-- Best regards, Alexandru Ionut Diaconescu -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130301/e1db9681/attachment.html>