https://bugs.llvm.org/show_bug.cgi?id=40187
Bug ID: 40187
Summary: clang::DominatorTree::buildDominatorTree crashes for
codes with infinite while loops
Product: clang
Version: 7.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Created attachment 21281
--> https://bugs.llvm.org/attachment.cgi?id=21281&action=edit
A tar of the folder containing the RAV code as well as some test cases
The buildDominatorTree function gives a segmentation fault when trying to build
a dominator tree within a RecursiveASTVisitor Visit function for a code
containing an infinite loop (specifically where the condition is 1) like this
code-
int main() {
int x, y, z;
x = 10;
while(1) {
x++;
if(x == 100) {
break;
}
}
return 0;
}
Assigning the value 1 to a variable and using the variable as a condition does
not cause an issue-
int main() {
int x, y, z;
x = 10;
y = 1;
while(y) {
x++;
if(x == 100) {
break;
}
}
return 0;
}
The code for reproducing the error as well as the test cases are in the tar
file
Found when using Clang 7 and LLVM 7 installed from the Debian packages
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