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Add function to measure stack high water mark (thanks @g3gg0)

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This commit is contained in:
Ivan Grokhotkov 2015-12-23 10:13:01 +03:00
parent 66a88ac8d2
commit 60baf802e1
2 changed files with 23 additions and 0 deletions
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4
cores/esp8266/cont.h
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@ -60,6 +60,10 @@ void cont_yield(cont_t*);
// return 1 if guard bytes were overwritten.
int cont_check(cont_t* cont);
// Go through stack and check how many bytes are most probably still unchanged
// and thus weren't used by the user code. i.e. that stack space is free. (high water mark)
int cont_get_free_stack(cont_t* cont);
// Check if yield() may be called. Returns true if we are running inside
// continuation stack
bool cont_can_yield(cont_t* cont);

19
cores/esp8266/cont_util.c
View File

@ -30,6 +30,12 @@ void ICACHE_RAM_ATTR cont_init(cont_t* cont) {
cont->stack_guard2 = CONT_STACKGUARD;
cont->stack_end = cont->stack + (sizeof(cont->stack) / 4);
cont->struct_start = (unsigned*) cont;
// fill stack with magic values to check high water mark
for(int pos = 0; pos < sizeof(cont->stack) / 4; pos++)
{
cont->stack[pos] = CONT_STACKGUARD;
}
}
int ICACHE_RAM_ATTR cont_check(cont_t* cont) {
@ -38,6 +44,19 @@ int ICACHE_RAM_ATTR cont_check(cont_t* cont) {
return 0;
}
int ICACHE_RAM_ATTR cont_get_free_stack(cont_t* cont) {
uint32_t *head = cont->stack;
int freeWords = 0;
while(*head == CONT_STACKGUARD)
{
head++;
freeWords++;
}
return freeWords * 4;
}
bool ICACHE_RAM_ATTR cont_can_yield(cont_t* cont) {
return !ETS_INTR_WITHINISR() &&
cont->pc_ret != 0 && cont->pc_yield == 0;