adding of interesting symbols only

src/rvprof_symbols.c

@@ -25,4 +25,44 @@ static void calculate_base_address(void* known_runtime_addr, uintptr_t known_elf
 }
 
 // compare function for symbol table quicksort
-// TODO
+static int compare_symbol(const void* a, const void* b){
+    const symbol_entry_t* sym_a = (const symbol_entry_t*)a;
+    const symbol_entry_t* sym_b = (const symbol_entry_t*)b;
+
+    if (sym_a->addr < sym_b->addr) return -1;
+    if (sym_a->addr > sym_b->addr) return 1;
+    return 0;
+}
+
+// add symbol to symbol table
+static int add_symbol(uintptr_t addr, const char* name, size_t size){
+    if (!name || strlen(name) == 0) return 0;
+
+    // skip most internal symbols
+    if (name[0] == '_' && name[1] == '_'){
+        if (strncmp(name, "__cyg_profile", 13) == 0) return 0;
+        if (strncmp(name, "__libc_", 7) == 0) return 0;
+        if (strncmp(name, "__gmon_", 7) == 0) return 0;
+        if (strstr(name, "_start") == NULL && strstr(name, "_init") == NULL && strstr(name, "_fini") == NULL && strstr(name, "main") == NULL) {
+            return 0;
+        }
+    }
+
+    // skip section symbols
+    if (strstr(name, ".") != NULL) return 0;
+    // skip versioned symbols
+    if (strstr(name, "@") != NULL) return 0;
+
+    // add interesting symbols
+    size_t name_len = strlen(name);
+    char* tmp_name = rvprof_malloc(name_len+1);
+    if (!tmp_name) return -1;
+    strcpy(tmp_name, name);
+
+    g_rvprof.symbols.data[g_rvprof.symbols.size].addr = addr;
+    g_rvprof.symbols.data[g_rvprof.symbols.size].name = tmp_name;
+    g_rvprof.symbols.data[g_rvprof.symbols.size].size = size;
+    g_rvprof.symbols.size++;
+
+    return 0;
+}