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Fix stack memory, undefined behavior, etc.

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Justine Tunney 2023-08-15 19:09:35 -07:00
parent 110559ce6a
commit 507d7a0b0b
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GPG key ID: BE714B4575D6E328
11 changed files with 41 additions and 186 deletions
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21
libc/runtime/stack.h
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@ -81,9 +81,18 @@ extern char ape_stack_memsz[] __attribute__((__weak__));
extern char ape_stack_align[] __attribute__((__weak__));
/**
* Returns size of stack, which is always a two power.
* Returns preferred size and alignment of thread stack.
*
* This will always be equal to `PTHREAD_STACK_MIN`.
*/
#define GetStackSize() ((uintptr_t)ape_stack_memsz)
#define GetStackSize() 262144
/**
* Returns preferred stack guard size.
*
* This is the max cpu page size of supported architectures.
*/
#define GetGuardSize() 16384
/**
* Returns address of bottom of stack.
@ -124,9 +133,13 @@ extern char ape_stack_align[] __attribute__((__weak__));
/**
* Returns true if at least `n` bytes of stack are available.
*/
#define HaveStackMemory(n) \
((intptr_t)__builtin_frame_address(0) >= GetStackAddr() + 16384 + (n))
#define HaveStackMemory(n) \
((intptr_t)__builtin_frame_address(0) >= \
GetStackAddr() + GetGuardSize() + (n))
/**
* Extends stack memory by poking large allocations.
*/
forceinline void CheckLargeStackAllocation(void *p, ssize_t n) {
for (; n > 0; n -= 4096) {
((char *)p)[n - 1] = 0;