Add rules for malloc, realloc, and free

Author: lucic71

rules/cstdlib/ir_unsafe.json

@@ -5,5 +5,90 @@
         "text": "std::process::abort();"
       }
     ]
+  },
+  "f2": {
+    "body": [
+      {
+        "text": "libc::free("
+      },
+      {
+        "placeholder": {
+          "arg": 0,
+          "access": "read"
+        }
+      },
+      {
+        "text": ")"
+      }
+    ],
+    "params": {
+      "a0": {
+        "type": "*mut ::libc::c_void",
+        "is_unsafe_pointer": true
+      }
+    }
+  },
+  "f3": {
+    "body": [
+      {
+        "text": "libc::malloc("
+      },
+      {
+        "placeholder": {
+          "arg": 0,
+          "access": "read"
+        }
+      },
+      {
+        "text": " as ::libc::size_t)"
+      }
+    ],
+    "params": {
+      "a0": {
+        "type": "u64"
+      }
+    },
+    "return_type": {
+      "type": "*mut ::libc::c_void",
+      "is_unsafe_pointer": true
+    }
+  },
+  "f4": {
+    "body": [
+      {
+        "text": "libc::realloc("
+      },
+      {
+        "placeholder": {
+          "arg": 0,
+          "access": "read"
+        }
+      },
+      {
+        "text": ", "
+      },
+      {
+        "placeholder": {
+          "arg": 1,
+          "access": "read"
+        }
+      },
+      {
+        "text": " as ::libc::size_t)"
+      }
+    ],
+    "params": {
+      "a0": {
+        "type": "*mut ::libc::c_void",
+        "is_unsafe_pointer": true
+      },
+      "a1": {
+        "type": "u64"
+      }
+    },
+    "return_type": {
+      "type": "*mut ::libc::c_void",
+      "is_unsafe_pointer": true
+    }
   }
 }

rules/cstdlib/src.cpp

@@ -4,3 +4,9 @@
 #include <cstdlib>
 
 void f1() { return std::abort(); }
+
+void f2(void *a0) { return free(a0); }
+
+void *f3(size_t a0) { return malloc(a0); }
+
+void *f4(void *a0, size_t a1) { return realloc(a0, a1); }

rules/cstdlib/tgt_unsafe.rs

@@ -4,3 +4,15 @@
 unsafe fn f1() {
     std::process::abort();
 }
+
+unsafe fn f2(a0: *mut ::libc::c_void) {
+    libc::free(a0)
+}
+
+unsafe fn f3(a0: u64) -> *mut ::libc::c_void {
+    libc::malloc(a0 as ::libc::size_t)
+}
+
+unsafe fn f4(a0: *mut ::libc::c_void, a1: u64) -> *mut ::libc::c_void {
+    libc::realloc(a0, a1 as ::libc::size_t)
+}

tests/unit/malloc_realloc_free.c

@@ -0,0 +1,32 @@
+// no-compile: refcount
+#include <assert.h>
+#include <stdlib.h>
+
+int main() {
+  int *p = (int *)malloc(sizeof(int));
+  *p = 42;
+  assert(*p == 42);
+  free(p);
+
+  int *arr = (int *)malloc(4 * sizeof(int));
+  for (int i = 0; i < 4; i++) {
+    arr[i] = i * 10;
+  }
+  assert(arr[0] == 0);
+  assert(arr[3] == 30);
+  free(arr);
+
+  int *grow = (int *)malloc(2 * sizeof(int));
+  grow[0] = 1;
+  grow[1] = 2;
+  grow = (int *)realloc(grow, 4 * sizeof(int));
+  grow[2] = 3;
+  grow[3] = 4;
+  assert(grow[0] == 1);
+  assert(grow[1] == 2);
+  assert(grow[2] == 3);
+  assert(grow[3] == 4);
+  free(grow);
+
+  return 0;
+}

tests/unit/out/unsafe/malloc_realloc_free.rs

@@ -0,0 +1,48 @@
+extern crate libc;
+use libc::*;
+extern crate libcc2rs;
+use libcc2rs::*;
+use std::collections::BTreeMap;
+use std::io::{Read, Seek, Write};
+use std::os::fd::{AsFd, FromRawFd, IntoRawFd};
+use std::rc::Rc;
+pub fn main() {
+    unsafe {
+        std::process::exit(main_0() as i32);
+    }
+}
+unsafe fn main_0() -> i32 {
+    let mut p: *mut i32 =
+        (libc::malloc(::std::mem::size_of::<i32>() as u64 as ::libc::size_t) as *mut i32);
+    (*p) = 42;
+    assert!(((((*p) == (42)) as i32) != 0));
+    libc::free((p as *mut i32 as *mut ::libc::c_void));
+    let mut arr: *mut i32 = (libc::malloc(
+        (4_u64).wrapping_mul(::std::mem::size_of::<i32>() as u64 as u64) as ::libc::size_t,
+    ) as *mut i32);
+    let mut i: i32 = 0;
+    'loop_: while ((((i) < (4)) as i32) != 0) {
+        (*arr.offset((i) as isize)) = ((i) * (10));
+        i.postfix_inc();
+    }
+    assert!(((((*arr.offset((0) as isize)) == (0)) as i32) != 0));
+    assert!(((((*arr.offset((3) as isize)) == (30)) as i32) != 0));
+    libc::free((arr as *mut i32 as *mut ::libc::c_void));
+    let mut grow: *mut i32 = (libc::malloc(
+        (2_u64).wrapping_mul(::std::mem::size_of::<i32>() as u64 as u64) as ::libc::size_t,
+    ) as *mut i32);
+    (*grow.offset((0) as isize)) = 1;
+    (*grow.offset((1) as isize)) = 2;
+    grow = (libc::realloc(
+        (grow as *mut i32 as *mut ::libc::c_void),
+        (4_u64).wrapping_mul(::std::mem::size_of::<i32>() as u64 as u64) as ::libc::size_t,
+    ) as *mut i32);
+    (*grow.offset((2) as isize)) = 3;
+    (*grow.offset((3) as isize)) = 4;
+    assert!(((((*grow.offset((0) as isize)) == (1)) as i32) != 0));
+    assert!(((((*grow.offset((1) as isize)) == (2)) as i32) != 0));
+    assert!(((((*grow.offset((2) as isize)) == (3)) as i32) != 0));
+    assert!(((((*grow.offset((3) as isize)) == (4)) as i32) != 0));
+    libc::free((grow as *mut i32 as *mut ::libc::c_void));
+    return 0;
+}