This commit is contained in:
Mario Zechner 2025-11-24 18:41:45 +01:00
parent e1856daf57
commit 7ff3e572a4
8 changed files with 3 additions and 610 deletions

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@ -1,33 +0,0 @@
# Set breakpoint at main
b main
# Run the program
run
# Step through to see what happens
n
n
n
n
n
n
n
n
n
n
n
n
n
# Now we're in the loop - let's examine the students array
p num_students
p students[0]
p students[1]
p students[2]
# Continue to the crash
c
# When it crashes, show backtrace
bt
# Examine the frame
frame variable
# Look at what students[i] is when it crashes
p i
p students[i]
quit

479
out.html

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{
"name": "mini-lit",
"path": "../mini-lit"
},
{
"path": "../../agent-tools/browser-tools"
}
],
"settings": {}

BIN
test

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73
test.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct {
char *name;
int age;
int *scores;
} Student;
Student* create_student(const char *name, int age, int num_scores) {
Student *s = malloc(sizeof(Student));
s->name = malloc(strlen(name)); // Bug 1: Missing +1 for null terminator
strcpy(s->name, name);
s->age = age;
s->scores = malloc(num_scores * sizeof(int));
return s;
}
void print_student(Student *s, int num_scores) {
printf("Name: %s, Age: %d\n", s->name, s->age);
printf("Scores: ");
for (int i = 0; i <= num_scores; i++) { // Bug 2: Off-by-one error (should be <)
printf("%d ", s->scores[i]);
}
printf("\n");
}
double calculate_average(int *scores, int count) {
int sum = 0;
for (int i = 0; i < count; i++) {
sum += scores[i];
}
return sum / count; // Bug 3: Integer division instead of floating point
}
void free_student(Student *s) {
free(s->name);
free(s->scores);
// Bug 4: Forgot to free(s) itself - memory leak
}
int main() {
int num_students = 3;
Student **students = malloc(num_students * sizeof(Student*));
students[0] = create_student("Alice", 20, 3);
students[0]->scores[0] = 85;
students[0]->scores[1] = 90;
students[0]->scores[2] = 88;
students[1] = create_student("Bob", 22, 3);
students[1]->scores[0] = 75;
students[1]->scores[1] = 80;
students[1]->scores[2] = 70;
students[2] = NULL; // Bug 5: Uninitialized student
for (int i = 0; i < num_students; i++) {
print_student(students[i], 3); // Will crash on NULL student
double avg = calculate_average(students[i]->scores, 3);
printf("Average: %.2f\n\n", avg);
}
for (int i = 0; i < num_students; i++) {
if (students[i] != NULL) {
free_student(students[i]);
}
}
free(students);
return 0;
}

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>CFBundleDevelopmentRegion</key>
<string>English</string>
<key>CFBundleIdentifier</key>
<string>com.apple.xcode.dsym.test</string>
<key>CFBundleInfoDictionaryVersion</key>
<string>6.0</string>
<key>CFBundlePackageType</key>
<string>dSYM</string>
<key>CFBundleSignature</key>
<string>????</string>
<key>CFBundleShortVersionString</key>
<string>1.0</string>
<key>CFBundleVersion</key>
<string>1</string>
</dict>
</plist>

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---
triple: 'arm64-apple-darwin'
binary-path: test
relocations: []
...