1 files changed, 120 insertions, 0 deletions
diff --git a/libc/bionic/malloc_debug_check_mapinfo.cpp b/libc/bionic/malloc_debug_check_mapinfo.cpp
new file mode 100644
index 0000000..8cc2c99
--- /dev/null
+++ b/libc/bionic/malloc_debug_check_mapinfo.cpp
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "dlmalloc.h"
+#include "malloc_debug_check_mapinfo.h"
+
+// 6f000000-6f01e000 rwxp 00000000 00:0c 16389419   /system/lib/libcomposer.so
+// 012345678901234567890123456789012345678901234567890123456789
+// 0         1         2         3         4         5
+
+static mapinfo* parse_maps_line(char* line) {
+    int len = strlen(line);
+
+    if (len < 1) return 0;
+    line[--len] = 0;
+
+    if (len < 50) return 0;
+    if (line[20] != 'x') return 0;
+
+    mapinfo* mi = static_cast<mapinfo*>(dlmalloc(sizeof(mapinfo) + (len - 47)));
+    if (mi == 0) return 0;
+
+    mi->start = strtoul(line, 0, 16);
+    mi->end = strtoul(line + 9, 0, 16);
+    /* To be filled in parse_elf_info if the mapped section starts with
+     * elf_header
+     */
+    mi->next = 0;
+    strcpy(mi->name, line + 49);
+
+    return mi;
+}
+
+__LIBC_HIDDEN__
+mapinfo *init_mapinfo(int pid) {
+    struct mapinfo *milist = NULL;
+    char data[1024]; // Used to read lines as well as to construct the filename.
+    snprintf(data, sizeof(data), "/proc/%d/maps", pid);
+    FILE *fp = fopen(data, "r");
+    if (fp) {
+        while (fgets(data, sizeof(data), fp)) {
+            mapinfo *mi = parse_maps_line(data);
+            if (mi) {
+                mi->next = milist;
+                milist = mi;
+            }
+        }
+        fclose(fp);
+    }
+
+    return milist;
+}
+
+__LIBC_HIDDEN__
+void deinit_mapinfo(mapinfo *mi) {
+    mapinfo *del;
+    while (mi) {
+        del = mi;
+        mi = mi->next;
+        dlfree(del);
+    }
+}
+
+/* Map a pc address to the name of the containing ELF file */
+__LIBC_HIDDEN__
+const char *map_to_name(mapinfo *mi, unsigned pc, const char* def) {
+    while (mi) {
+        if ((pc >= mi->start) && (pc < mi->end)) {
+            return mi->name;
+        }
+        mi = mi->next;
+    }
+    return def;
+}
+
+/* Find the containing map info for the pc */
+__LIBC_HIDDEN__
+const mapinfo *pc_to_mapinfo(mapinfo *mi, unsigned pc, unsigned *rel_pc) {
+    *rel_pc = pc;
+    while (mi) {
+        if ((pc >= mi->start) && (pc < mi->end)) {
+            // Only calculate the relative offset for shared libraries
+            if (strstr(mi->name, ".so")) {
+                *rel_pc -= mi->start;
+            }
+            return mi;
+        }
+        mi = mi->next;
+    }
+    return NULL;
+}