Hi all,
I want to extract loop condition from a program or an abstract syntax tree in clang. While researching on this topic, I came to know loop conditions can be extracted into a function. How to extract this loop condition into a function or is there any command in Clang to directly extract loop conditions from an abstract syntax tree or a program. Kindly help me with this.
Without writing a program, you can just dump the AST for small example programs:
https://clang.llvm.org/docs/IntroductionToTheClangAST.html
Then you can visually search for loop conditions.
Sir, as you told we can visually find loop condition from abstract syntax tree. But, I want to automatically extract loop condition from either abstract syntax tree or a program.
https://clang.llvm.org/docs/RAVFrontendAction.html
Clang supports ASTVisitors. You can write your own program to visit the AST and find the loop conditions.
Thank you for your help !!
Sir, I have created the findClassDecls.cpp and CMakeLists.txt file as provided in the link. After these steps, how can we extract loop conditions using these visitor class ?
In the provided link, they have given a command. But I got error while executing this command. I am attaching the screenshot of the obtained error.
I don’t know what link you’re referring to, but I find it unlikely that bin/find-class-decls is expected to be in your home directory. Either whatever guide you’re following overlooked a step or you did.
The following page has more details about the configuration and build steps:
https://clang.llvm.org/docs/LibASTMatchersTutorial.html
In LLVM IR loops are harder to find:
https://llvm.org/docs/LoopTerminology.html
You could search for induction variable.
I am a beginner who is using Clang. I am trying to extract loop conditions and I just want to get loop conditions extracted from the program.
The program from which I want to extract loop conditions is given below :
void main()
{
int a;
while(a >10)
a = a - 1;
}
This program contains a single while loop which contains a condition a < 10. I just want to extract this condition a < 10 from this program.
Clang has a WhileStmt and it has a getCond() member function. With ASTVisitors you should be able to find the while loop.
I have gone through the reference documentation. With this member function and ASTVisitors, how can I extract loop condition ? Is there any example showing how could it be done ?
You might consider looking at AST matchers which can make the task easier. Have a look at:
https://eli.thegreenplace.net/2014/07/29/ast-matchers-and-clang-refactoring-tools
https://clang.llvm.org/docs/LibASTMatchersTutorial.html
On Tue, Mar 28, 2023 at 2:32 AM Sreenu via LLVM Discussion Forums <notifications@llvm.discoursemail.com> wrote:
Sreenu
March 28I have gone through the reference documentation. With this member function and ASTVisitors, how can I extract loop condition ? Is there any example showing how could it be done ?
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