Add a way to retrieve stack bottom of the main thread

I'm working on Nim bindings and Nim GC needs to know the stack
boundaries to check whether certain pointers are located on the stack
or in the heap. This commit adds godot_get_stack_bottom procedure
to gdnative module which returns pointer to the stack bottom of the
main thread. Later on this may be improved to return stack bottom of
the current thread.
This commit is contained in:
Ruslan Mustakov 2017-07-19 18:49:19 +07:00
parent b31973b64d
commit 3b88476130
4 changed files with 25 additions and 0 deletions

View file

@ -512,7 +512,13 @@ bool OS::check_feature_support(const String &p_feature) {
return false;
}
void *OS::get_stack_bottom() const {
return _stack_bottom;
}
OS::OS() {
void *volatile stack_bottom;
last_error = NULL;
singleton = this;
_keep_screen_on = true; // set default value to true, because this had been true before godot 2.0.
@ -525,6 +531,7 @@ OS::OS() {
_render_thread_mode = RENDER_THREAD_SAFE;
_allow_hidpi = true;
_stack_bottom = (void *)(&stack_bottom);
}
OS::~OS() {

View file

@ -60,6 +60,8 @@ class OS {
char *last_error;
void *_stack_bottom;
public:
enum RenderThreadMode {
@ -411,6 +413,13 @@ public:
bool check_feature_support(const String &p_feature);
/**
* Returns the stack bottom of the main thread of the application.
* This may be of use when integrating languages with garbage collectors that
* need to check whether a pointer is on the stack.
*/
virtual void *get_stack_bottom() const;
bool is_hidpi_allowed() const { return _allow_hidpi; }
OS();
virtual ~OS();

View file

@ -33,6 +33,7 @@
#include "error_macros.h"
#include "gdnative.h"
#include "global_constants.h"
#include "os/os.h"
#include "project_settings.h"
#include "variant.h"
@ -89,6 +90,10 @@ godot_object GDAPI *godot_global_get_singleton(char *p_name) {
return (godot_object *)ProjectSettings::get_singleton()->get_singleton_object(String(p_name));
} // result shouldn't be freed
void GDAPI *godot_get_stack_bottom() {
return OS::get_singleton()->get_stack_bottom();
}
// MethodBind API
godot_method_bind GDAPI *godot_method_bind_get_method(const char *p_classname, const char *p_methodname) {

View file

@ -245,6 +245,10 @@ void GDAPI godot_object_destroy(godot_object *p_o);
godot_object GDAPI *godot_global_get_singleton(char *p_name); // result shouldn't be freed
////// OS API
void GDAPI *godot_get_stack_bottom(); // returns stack bottom of the main thread
////// MethodBind API
typedef struct {