handle exit with uninitialized value

Author: andrew-taylor

tests/expected_output/clang-6.0-x86_64-pc-linux-gnu/unitialized_exit_status.txt

@@ -0,0 +1,6 @@
+
+
+Runtime error: exit value is uninitialized
+
+Main is returning an uninitialized value or exit has been passed an uninitialized value.
+

tests/expected_output/clang-7.0-x86_64-pc-linux-gnu/unitialized_exit_status.txt

@@ -0,0 +1,6 @@
+
+
+Runtime error: exit value is uninitialized
+
+Main is returning an uninitialized value or exit has been passed an uninitialized value.
+

tests/expected_output/clang-8.0-x86_64-pc-linux-gnu/unitialized_exit_status.txt

@@ -0,0 +1,6 @@
+
+
+Runtime error: exit value is uninitialized
+
+Main is returning an uninitialized value or exit has been passed an uninitialized value.
+

tests/run_time_errors/unitialized_exit_status.c

@@ -0,0 +1,14 @@
+// A simple C program that attempts to be punny
+// Written 23/2/2017
+// by Angela Finlayson ([email protected])
+// for COMP1511 Lab 01 Exercise 1
+
+#include <stdio.h>
+
+int main(int argc, char *argv[]) {
+	int a[2];
+	a[0] = 0;
+    printf("Hello, it is good to C you!\n");
+
+    return a[argc];
+}

watch_valgrind.py

@@ -27,6 +27,15 @@ def watch_valgrind():
 			sys.stderr.flush()
 			start_gdb()
 			break
+		elif 'exit_group(status)' in line:
+			error = f"""Runtime error: {color('exit value is uninitialized', 'red')}
+
+Main is returning an uninitialized value or exit has been passed an uninitialized value.
+"""
+			os.environ['DCC_VALGRIND_ERROR'] = error
+			print('\n' + error, file=sys.stderr)
+			start_gdb()
+			sys.exit(1)
 		elif 'below stack pointer' in line:
 			error = f"""Runtime error: {color('access to function variables after function has returned', 'red')}
 You have used a pointer to a local variable that no longer exists.