lib/utils: Add pyexec_frozen_module to load and execute frozen module.

This is a convenience function similar to pyexec_file.  It should be used
instead of raw mp_parse_compile_execute because the latter does not catch
and report exceptions.

esp8266/main.c

@@ -32,7 +32,6 @@
 #include "py/runtime0.h"
 #include "py/runtime.h"
 #include "py/stackctrl.h"
-#include "py/frozenmod.h"
 #include "py/mphal.h"
 #include "py/gc.h"
 #include "lib/utils/pyexec.h"
@@ -49,8 +48,7 @@ STATIC void mp_reset(void) {
     mp_obj_list_init(mp_sys_path, 0);
     mp_obj_list_init(mp_sys_argv, 0);
 #if MICROPY_MODULE_FROZEN
-    mp_lexer_t *lex = mp_find_frozen_module("main", 4);
-    mp_parse_compile_execute(lex, MP_PARSE_FILE_INPUT, mp_globals_get(), mp_locals_get());
+    pyexec_frozen_module("main");
 #endif
 }
 

lib/utils/pyexec.c

@@ -27,12 +27,14 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <stdint.h>
+#include <string.h>
 
 #include "py/nlr.h"
 #include "py/compile.h"
 #include "py/runtime.h"
 #include "py/repl.h"
 #include "py/gc.h"
+#include "py/frozenmod.h"
 #include "py/mphal.h"
 #if defined(USE_DEVICE_MODE)
 #include "irq.h"
@@ -476,6 +478,19 @@ int pyexec_file(const char *filename) {
     return parse_compile_execute(lex, MP_PARSE_FILE_INPUT, 0);
 }
 
+#if MICROPY_MODULE_FROZEN
+int pyexec_frozen_module(const char *name) {
+    mp_lexer_t *lex = mp_find_frozen_module(name, strlen(name));
+
+    if (lex == NULL) {
+        printf("could not find module '%s'\n", name);
+        return false;
+    }
+
+    return parse_compile_execute(lex, MP_PARSE_FILE_INPUT, 0);
+}
+#endif
+
 mp_obj_t pyb_set_repl_info(mp_obj_t o_value) {
     repl_display_debugging_info = mp_obj_get_int(o_value);
     return mp_const_none;

lib/utils/pyexec.h

@@ -39,6 +39,7 @@ extern pyexec_mode_kind_t pyexec_mode_kind;
 int pyexec_raw_repl(void);
 int pyexec_friendly_repl(void);
 int pyexec_file(const char *filename);
+int pyexec_frozen_module(const char *name);
 void pyexec_event_repl_init(void);
 int pyexec_event_repl_process_char(int c);
 

teensy/main.c

@@ -22,11 +22,6 @@
 #include "uart.h"
 #include "pin.h"
 
-#if MICROPY_MODULE_FROZEN
-#include "py/compile.h"
-#include "py/frozenmod.h"
-#endif
-
 extern uint32_t _heap_start;
 
 void flash_error(int n) {
@@ -306,10 +301,7 @@ soft_reset:
 #endif
 
 #if MICROPY_MODULE_FROZEN
-    {
-        mp_lexer_t *lex = mp_find_frozen_module("boot", 4);
-        mp_parse_compile_execute(lex, MP_PARSE_FILE_INPUT, mp_globals_get(), mp_locals_get());
-    }
+    pyexec_frozen_module("boot");
 #else
     if (!pyexec_file("/boot.py")) {
         flash_error(4);
@@ -321,10 +313,7 @@ soft_reset:
 
     // run main script
 #if MICROPY_MODULE_FROZEN
-    {
-        mp_lexer_t *lex = mp_find_frozen_module("main", 4);
-        mp_parse_compile_execute(lex, MP_PARSE_FILE_INPUT, mp_globals_get(), mp_locals_get());
-    }
+    pyexec_frozen_module("main");
 #else
     {
         vstr_t *vstr = vstr_new();