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rt: Switch to the C stack in reset_stack_limit

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This commit is contained in:
Brian Anderson 2012-02-22 23:50:27 -08:00
parent c16bfbe0c3
commit b5c7997ef5
2 changed files with 24 additions and 5 deletions
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27
src/rt/rust_task.cpp
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@ -687,6 +687,23 @@ sp_in_stk_seg(uintptr_t sp, stk_seg *stk) {
return (uintptr_t)stk->data <= sp && sp <= stk->end;
}
struct reset_args {
rust_task *task;
uintptr_t sp;
};
void
reset_stack_limit_on_c_stack(reset_args *args) {
rust_task *task = args->task;
uintptr_t sp = args->sp;
while (!sp_in_stk_seg(sp, task->stk)) {
task->del_stack();
A(task->thread, task->stk != NULL,
"Failed to find the current stack");
}
task->record_stack_limit();
}
/*
Called by landing pads during unwinding to figure out which
stack segment we are currently running on, delete the others,
@ -695,12 +712,12 @@ through __morestack).
*/
void
rust_task::reset_stack_limit() {
I(thread, on_rust_stack());
uintptr_t sp = get_sp();
while (!sp_in_stk_seg(sp, stk)) {
del_stack();
A(thread, stk != NULL, "Failed to find the current stack");
}
record_stack_limit();
// Have to do the rest on the C stack because it involves
// freeing stack segments, logging, etc.
reset_args ra = {this, sp};
call_on_c_stack(&ra, (void*)reset_stack_limit_on_c_stack);
}
void

2
src/rt/rust_task.h
View file

@ -39,6 +39,7 @@ typedef unsigned long task_result;
struct spawn_args;
struct cleanup_args;
struct reset_args;
// std::lib::task::task_notification
//
@ -131,6 +132,7 @@ private:
friend void task_start_wrapper(spawn_args *a);
friend void cleanup_task(cleanup_args *a);
friend void reset_stack_limit_on_c_stack(reset_args *a);
public: