Replace runtime strip_path function with compiler intrinsic equivalents

Sleep manager tracing strips the path from filenames and uses the result as an
identifier to track drivers that unlock/lock sleep tracing. Replace the function
that strips the path from the string, replace this function with a new macro,
__FILENAME__ which performs the same action in a compiler specific manner.

- GCC_ARM, use __builtin_strrchr which is optimized out at compile time.
- ARM, use __MODULE__ which returns the filename without path.
- IAR, specifiy the --no_path_in_file_macros compiler flag.

Author: Steven Cartmell

hal/mbed_sleep_manager.c

@@ -42,23 +42,6 @@ typedef struct sleep_statistic {
 
 static sleep_statistic_t sleep_stats[STATISTIC_COUNT];
 
-static const char* strip_path(const char* const filename)
-{
-    char *output = strrchr(filename, '/');
-
-    if (output != NULL) {
-        return output + 1;
-    }
-
-    output = strrchr(filename, '\\');
-
-    if (output != NULL) {
-        return output + 1;
-    }
-
-    return filename;
-}
-
 static sleep_statistic_t* sleep_tracker_find(const char *const filename)
 {
     char temp[IDENTIFIER_WIDTH];
@@ -115,34 +98,31 @@ static void sleep_tracker_print_stats(void)
 
 void sleep_tracker_lock(const char* const filename, int line)
 {
-    const char* const stripped_path = strip_path(filename);
-
-    sleep_statistic_t* stat = sleep_tracker_find(stripped_path);
+    sleep_statistic_t *stat = sleep_tracker_find(filename);
 
     // Entry for this driver does not exist, create one.
     if (stat == NULL) {
-        stat = sleep_tracker_add(stripped_path);
+        stat = sleep_tracker_add(filename);
     }
 
     core_util_atomic_incr_u8(&stat->count, 1);
 
-    debug("LOCK: %s, ln: %i, lock count: %u\r\n", stripped_path, line, deep_sleep_lock);
+    debug("LOCK: %s, ln: %i, lock count: %u\r\n", filename, line, deep_sleep_lock);
 }
 
 void sleep_tracker_unlock(const char* const filename, int line)
 {
-    const char* const stripped_path = strip_path(filename);
-    sleep_statistic_t* stat = sleep_tracker_find(stripped_path);
+    sleep_statistic_t *stat = sleep_tracker_find(filename);
 
     // Entry for this driver does not exist, something went wrong.
     if (stat == NULL) {
-        debug("Unlocking sleep for driver that was not previously locked: %s, ln: %i\r\n", stripped_path, line);
+        debug("Unlocking sleep for driver that was not previously locked: %s, ln: %i\r\n", filename, line);
         return;
     }
 
     core_util_atomic_decr_u8(&stat->count, 1);
 
-    debug("UNLOCK: %s, ln: %i, lock count: %u\r\n", stripped_path, line, deep_sleep_lock);
+    debug("UNLOCK: %s, ln: %i, lock count: %u\r\n", filename, line, deep_sleep_lock);
 }
 
 #endif // MBED_SLEEP_TRACING_ENABLED

platform/mbed_power_mgmt.h

@@ -68,18 +68,26 @@ extern "C" {
 void sleep_tracker_lock(const char *const filename, int line);
 void sleep_tracker_unlock(const char *const filename, int line);
 
-#define sleep_manager_lock_deep_sleep()           \
-    do                                            \
-    {                                             \
-        sleep_manager_lock_deep_sleep_internal(); \
-        sleep_tracker_lock(__FILE__, __LINE__);   \
-    } while (0);
+#if defined(__CC_ARM) || (defined(__ARMCC_VERSION) && (__ARMCC_VERSION >= 6010050))
+#define __FILENAME__ __MODULE__
+#elif defined(__GNUC__)
+#define __FILENAME__ (__builtin_strrchr(__FILE__, '/') ? __builtin_strrchr(__FILE__, '/') + 1 : __builtin_strrchr(__FILE__, '\\') ? __builtin_strrchr(__FILE__, '\\') + 1 : __FILE__)
+#else
+#define __FILENAME__ __FILE__
+#endif
 
-#define sleep_manager_unlock_deep_sleep()           \
+#define sleep_manager_lock_deep_sleep()             \
     do                                              \
     {                                               \
-        sleep_manager_unlock_deep_sleep_internal(); \
-        sleep_tracker_unlock(__FILE__, __LINE__);   \
+        sleep_manager_lock_deep_sleep_internal();   \
+        sleep_tracker_lock(__FILENAME__, __LINE__); \
+    } while (0);
+
+#define sleep_manager_unlock_deep_sleep()             \
+    do                                                \
+    {                                                 \
+        sleep_manager_unlock_deep_sleep_internal();   \
+        sleep_tracker_unlock(__FILENAME__, __LINE__); \
     } while (0);
 
 #else
@@ -121,7 +129,6 @@ void sleep_manager_unlock_deep_sleep_internal(void);
  */
 bool sleep_manager_can_deep_sleep(void);
 
-
 /** Enter auto selected sleep mode. It chooses the sleep or deeepsleep modes based
  *  on the deepsleep locking counter
  *

tools/profiles/debug.json

@@ -51,7 +51,8 @@
         "common": [
             "--no_wrap_diagnostics",  "-e",
             "--diag_suppress=Pa050,Pa084,Pa093,Pa082", "-On", "-r", "-DMBED_DEBUG",
-            "-DMBED_TRAP_ERRORS_ENABLED=1", "--enable_restrict"],
+            "-DMBED_TRAP_ERRORS_ENABLED=1", "--enable_restrict",
+            "--no_path_in_file_macros"],
         "asm": [],
         "c": ["--vla"],
         "cxx": ["--guard_calls", "--no_static_destruction"],

tools/profiles/develop.json

@@ -46,7 +46,8 @@
     "IAR": {
         "common": [
             "--no_wrap_diagnostics", "-e",
-            "--diag_suppress=Pa050,Pa084,Pa093,Pa082", "-Oh", "--enable_restrict"],
+            "--diag_suppress=Pa050,Pa084,Pa093,Pa082", "-Oh", "--enable_restrict",
+            "--no_path_in_file_macros"],
         "asm": [],
         "c": ["--vla"],
         "cxx": ["--guard_calls", "--no_static_destruction"],