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Code Issues 1 Releases Wiki Activity

Allow use of stack in gc.

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This commit is contained in:
Calvin Rose 2018-09-23 17:10:41 -04:00
parent f0553e9da7
commit f5372dd188
2 changed files with 33 additions and 18 deletions
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49
src/core/gc.c
View File

@ -50,10 +50,12 @@ static void janet_mark_string(const uint8_t *str);
static void janet_mark_fiber(JanetFiber *fiber);
static void janet_mark_abstract(void *adata);
/* Mark a value (Pushes it to the black list).*/
void janet_mark(Janet x) {
static JANET_THREAD_LOCAL int recursion_depth;
/* Add a janet to the list for later processing */
static void janet_addtolist(Janet x) {
if (janet_vm_gc_marklist_count >= janet_vm_gc_marklist_capacity) {
janet_vm_gc_marklist_capacity = (3 * janet_vm_gc_marklist_count) / 2 + 1;
janet_vm_gc_marklist_capacity = (2 * janet_vm_gc_marklist_count) + 1;
janet_vm_gc_marklist = realloc(janet_vm_gc_marklist,
janet_vm_gc_marklist_capacity * sizeof(Janet));
if (NULL == janet_vm_gc_marklist) {
@ -63,6 +65,30 @@ void janet_mark(Janet x) {
janet_vm_gc_marklist[janet_vm_gc_marklist_count++] = x;
}
/* Mark a value Recurses on x, or pushes it to the black list
* if recursed too deeply (ran out of C stack).*/
void janet_mark(Janet x) {
if (recursion_depth) {
recursion_depth--;
switch (janet_type(x)) {
default: break;
case JANET_STRING:
case JANET_SYMBOL: janet_mark_string(janet_unwrap_string(x)); break;
case JANET_FUNCTION: janet_mark_function(janet_unwrap_function(x)); break;
case JANET_ARRAY: janet_mark_array(janet_unwrap_array(x)); break;
case JANET_TABLE: janet_mark_table(janet_unwrap_table(x)); break;
case JANET_STRUCT: janet_mark_struct(janet_unwrap_struct(x)); break;
case JANET_TUPLE: janet_mark_tuple(janet_unwrap_tuple(x)); break;
case JANET_BUFFER: janet_mark_buffer(janet_unwrap_buffer(x)); break;
case JANET_FIBER: janet_mark_fiber(janet_unwrap_fiber(x)); break;
case JANET_ABSTRACT: janet_mark_abstract(janet_unwrap_abstract(x)); break;
}
recursion_depth++;
} else {
janet_addtolist(x);
}
}
static void janet_mark_string(const uint8_t *str) {
janet_gc_mark(janet_string_raw(str));
}
@ -312,25 +338,14 @@ void *janet_gcalloc(enum JanetMemoryType type, size_t size) {
void janet_collect(void) {
size_t i;
if (janet_vm_gc_suspend) return;
recursion_depth = JANET_RECURSION_GUARD;
/* Mark the roots */
for (i = 0; i < janet_vm_gc_marklist_rootcount; i++)
janet_mark(janet_vm_gc_marklist[i]);
/* While list not empty */
while (janet_vm_gc_marklist_count > janet_vm_gc_marklist_rootcount) {
Janet x = janet_vm_gc_marklist[--janet_vm_gc_marklist_count];
switch (janet_type(x)) {
default: break;
case JANET_STRING:
case JANET_SYMBOL: janet_mark_string(janet_unwrap_string(x)); break;
case JANET_FUNCTION: janet_mark_function(janet_unwrap_function(x)); break;
case JANET_ARRAY: janet_mark_array(janet_unwrap_array(x)); break;
case JANET_TABLE: janet_mark_table(janet_unwrap_table(x)); break;
case JANET_STRUCT: janet_mark_struct(janet_unwrap_struct(x)); break;
case JANET_TUPLE: janet_mark_tuple(janet_unwrap_tuple(x)); break;
case JANET_BUFFER: janet_mark_buffer(janet_unwrap_buffer(x)); break;
case JANET_FIBER: janet_mark_fiber(janet_unwrap_fiber(x)); break;
case JANET_ABSTRACT: janet_mark_abstract(janet_unwrap_abstract(x)); break;
}
janet_mark(x);
}
janet_sweep();
janet_vm_next_collection = 0;
@ -340,7 +355,7 @@ void janet_collect(void) {
* and all of its children. If gcroot is called on a value n times, unroot
* must also be called n times to remove it as a gc root. */
void janet_gcroot(Janet root) {
janet_mark(root);
janet_addtolist(root);
janet_vm_gc_marklist_rootcount++;
}

2
src/core/vm.c
View File

@ -1333,7 +1333,7 @@ int janet_init(void) {
* a collection pretty much every cycle, which is
* incredibly horrible for performance, but can help ensure
* there are no memory bugs during development */
janet_vm_gc_interval = 0x4000000;
janet_vm_gc_interval = 0x10000;
janet_symcache_init();
/* Initialize gc list */
janet_vm_gc_marklist = NULL;