Hello All, I am trying to get basic CFG display to work. I have read the programmer's manual and it mentions that we can simply call the viewCFGOnly() (part of Function.h) from our sample program. When i read the comments for that method in Function.h, it mentions that i need to call it from the gdb debugger instead. I am confused as to how to get this working. Do we need to call it from a simple program or a debugger. An example would be very helpful. I have LLVM compiled in debug mode and have "dot" and "gv" in my path. I would appreciate any help or at least a point the right direction in terms of documentation. Thank you. -- View this message in context: http://www.nabble.com/viewCFGOnly%28%29-function-tp24593079p24593079.html Sent from the LLVM - Dev mailing list archive at Nabble.com.
You can call the function from your program OR the debugger. The comments simply inform you that it is quite handy to be able to call the function from a debugger (such as gdb). To call the function in you code simply add a line such as: F->viewCFGOnly(); Where F is an appropriate variable eg. a MachineFunction pointer If you are using gdb then you can do the following: call F->viewCFGOnly() from a point where F is live. David nxer wrote:> Hello All, > > I am trying to get basic CFG display to work. I have read the programmer's > manual and it mentions that we can simply call the viewCFGOnly() (part of > Function.h) from our sample program. When i read the comments for that > method in Function.h, it mentions that i need to call it from the gdb > debugger instead. I am confused as to how to get this working. Do we need to > call it from a simple program or a debugger. An example would be very > helpful. > > I have LLVM compiled in debug mode and have "dot" and "gv" in my path. > > I would appreciate any help or at least a point the right direction in terms > of documentation. Thank you.-- Notice The information in this message is confidential and may be legally privileged. It is intended solely for the addressee. Access to this message by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying or distribution of the message, or any action taken by you in reliance on it, is prohibited and may be unlawful. If you have received this message in error, please delete it and contact the sender immediately. Thank you. 3DLabs Ltd company number 02883883 registered in England and Wales at 79 Knightsbridge, London SW1X 7RB
Hello David,
Thanks for the reply. Would i not need to pass any arguments for
viewCFGOnly() method? According to this
http://llvm.org/doxygen/Function_8h-source.html seems like we need to?
I am building it on top of the example shown at
http://llvm.org/docs/WritingAnLLVMPass.html and just added
'F->viewCFGOnly(); line to it. It doesn't compile, i suspect it has
to do
with the way i am compiling (i thought i solved this). I want to make sure
if what i am doing below (code wise) is correct and that the result should
be a CFG for the function.
My code:
#include "llvm/Pass.h"
#include "llvm/Function.h"
using namespace llvm;
namespace {
struct Hello : public FunctionPass {
static char ID;
Hello() : FunctionPass(&ID) {}
virtual bool runOnFunction(Function &F) {
llvm::cerr << "Hello: " << F.getName() <<
"\n";
F->viewCFGOnly();
return false;
}
};
char Hello::ID = 0;
RegisterPass<Hello> X("hello", "Hello World Pass");
}
Thanks.
David Stuttard wrote:>
> You can call the function from your program OR the debugger. The
> comments simply inform you that it is quite handy to be able to call the
> function from a debugger (such as gdb).
>
> To call the function in you code simply add a line such as:
> F->viewCFGOnly();
> Where F is an appropriate variable eg. a MachineFunction pointer
>
> If you are using gdb then you can do the following:
> call F->viewCFGOnly()
>
> from a point where F is live.
>
> David
>
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