new w/ OOM raises an exception, shows the caller address for decoders

cores/esp8266/abi.cpp

@@ -32,13 +32,19 @@ extern "C" void __cxa_pure_virtual(void) __attribute__ ((__noreturn__));
 extern "C" void __cxa_deleted_virtual(void) __attribute__ ((__noreturn__));
 
 
-#if !defined(__cpp_exceptions) && !defined(NEW_OOM_ABORT)
+#if !defined(__cpp_exceptions)
+
+// overwrite weak operators new/new[] definitions
+
 void *operator new(size_t size)
 {
     void *ret = malloc(size);
     if (0 != size && 0 == ret) {
         umm_last_fail_alloc_addr = __builtin_return_address(0);
         umm_last_fail_alloc_size = size;
+#if defined(NEW_OOM_ABORT)
+        __unhandled_exception(PSTR("OOM"));
+#endif
     }
    return ret;
 }
@@ -49,10 +55,14 @@ void *operator new[](size_t size)
     if (0 != size && 0 == ret) {
         umm_last_fail_alloc_addr = __builtin_return_address(0);
         umm_last_fail_alloc_size = size;
+#if defined(NEW_OOM_ABORT)
+        __unhandled_exception(PSTR("OOM"));
+#endif
     }
     return ret;
 }
-#endif // arduino's std::new legacy
+
+#endif // !defined(__cpp_exceptions)
 
 void __cxa_pure_virtual(void)
 {

cores/esp8266/core_esp8266_postmortem.cpp

@@ -220,6 +220,10 @@ void __wrap_system_restart_local() {
 
     cut_here();
 
+    // now outside from the "cut-here" zone, print correctly the malloc address,
+    // idf-monitor.py will be able to decode this one and show exact location in sources
+    ets_printf_P(PSTR("\nlast failed alloc call: 0x%08x\n"), (uint32_t)umm_last_fail_alloc_addr);
+
     custom_crash_callback( &rst_info, sp_dump + offset, stack_end );
 
     ets_delay_us(10000);

cores/esp8266/debug.h

@@ -22,6 +22,7 @@ void hexdump(const void *mem, uint32_t len, uint8_t cols);
 extern "C" {
 #endif
 
+void __unhandled_exception(const char *str) __attribute__((noreturn));
 void __panic_func(const char* file, int line, const char* func) __attribute__((noreturn));
 #define panic() __panic_func(PSTR(__FILE__), __LINE__, __func__)