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mruby-lvgui-native-fragment: Add assert debug handler

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This, paired with the appropriate changes in lvgui, allows us to print
some information about the mruby state when LVGL asserts happen.
This commit is contained in:
Samuel Dionne-Riel 2021-08-17 23:13:41 -04:00
parent 67ab49a2cb
commit 8f78c7d9b1
1 changed files with 72 additions and 0 deletions
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72
boot/script-loader/mruby-lvgui-native/src/debug.c Normal file
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#include <stdlib.h>
#include <string.h>
#include <mruby.h>
#include <mruby/array.h>
#include <mruby/irep.h>
#include <mruby/variable.h>
#include <mruby/string.h>
#include <mruby/error.h>
// Declares main_mrb_state, but more importantly, defines it weakly
// so that if the stub does not provide it (or other mruby build does not)
// this module still builds and links.
mrb_state *main_mrb_state __attribute__ ((weak));
// https://github.com/mruby/mruby/blob/f9d113f7647121f8578742a2a9ac256ece365e3f/src/backtrace.c#L79-L101
static void
print_backtrace(mrb_state *mrb, mrb_value backtrace)
{
mrb_int i;
mrb_int n = RARRAY_LEN(backtrace);
mrb_value *loc/*, mesg*/;
FILE *stream = stderr;
if (n != 0) {
fprintf(stream, "trace (most recent call last):\n");
for (i=n-1,loc=&RARRAY_PTR(backtrace)[i]; i>0; i--,loc--) {
if (mrb_string_p(*loc)) {
fprintf(stream, "\t[%d] %.*s\n",
(int)i, (int)RSTRING_LEN(*loc), RSTRING_PTR(*loc));
}
}
if (mrb_string_p(*loc)) {
fprintf(stream, "\t[0] %.*s: ", (int)RSTRING_LEN(*loc), RSTRING_PTR(*loc));
}
}
}
void lv_debug_app_assert_handler(void)
{
if (main_mrb_state != NULL) {
fprintf(stderr, "\n--[ lv_debug_app_assert_handler() ]--\n");
fprintf(stderr, "Backtrace:\n");
print_backtrace(main_mrb_state, mrb_get_backtrace(main_mrb_state));
mrb_close(main_mrb_state);
fprintf(stderr, "\n--[===============================]--\n");
}
else {
fprintf(stderr, "\nWarning: Could not get main_mrb_state to inspect mrb state.\n");
fprintf(stderr, " This may mean the mruby startup stub did not setup `main_mrb_state`.\n");
}
// Assume we always want to
abort();
}
void
mrb_mruby_lvgui_native_fragment_gem_init(mrb_state *mrb)
{
if (main_mrb_state != NULL) {
fprintf(stderr, "Warning: mruby_lvgui_native_fragment_init clobbering previously defined mrb instance.\n");
fprintf(stderr, " backtraces from lvgui asserts may not be correct.\n");
}
main_mrb_state = mrb;
}
void
mrb_mruby_lvgui_native_fragment_gem_final(mrb_state *mrb)
{
main_mrb_state = NULL;
}