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[python] Fixed the Python stack length computation.

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On the device, the stack is stored in reverse order, but it might not be
the case on other platforms, which changes stack length computation.

Change-Id: I0218224a77465b9672f137771c00f734fdfaea64
This commit is contained in:
Léa Saviot
2017-11-21 17:47:23 +01:00
parent 52bdf4a41f
commit 6ccd0c1c55
1 changed files with 11 additions and 1 deletions
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12
python/port/port.cpp
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@@ -133,7 +133,17 @@ void gc_collect(void) {
setjmp(regs);
void **regs_ptr = (void**)(void*)&regs;
gc_collect_root(regs_ptr, ((uintptr_t)python_stack_top - (uintptr_t)&regs) / sizeof(uintptr_t));
/* On the device, the stack is stored in reverse order, but it might not be
* the case on a computer. We thus have to take the absolute value of the
* addresses difference. */
size_t stackLength;
if ((uintptr_t)python_stack_top > (uintptr_t)(&regs)) {
stackLength = (((uintptr_t)python_stack_top - (uintptr_t)(&regs)) / sizeof(uintptr_t));
} else {
stackLength = (((uintptr_t)(&regs) - (uintptr_t)python_stack_top) / sizeof(uintptr_t));
}
gc_collect_root(regs_ptr, stackLength);
gc_collect_end();
}