mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 23:13:34 +00:00
226aaf3547
This commit makes numerous refinements to cosmopolitan memory handling.
The default stack size has been reduced from 2mb to 128kb. A new macro
is now provided so you can easily reconfigure the stack size to be any
value you want. Work around the breaking change by adding to your main:
STATIC_STACK_SIZE(0x00200000); // 2mb stack
If you're not sure how much stack you need, then you can use:
STATIC_YOINK("stack_usage_logging");
After which you can `sort -nr o/$MODE/stack.log`. Based on the unit test
suite, nothing in the Cosmopolitan repository (except for Python) needs
a stack size greater than 30kb. There are also new macros for detecting
the size and address of the stack at runtime, e.g. GetStackAddr(). We
also now support sigaltstack() so if you want to see nice looking crash
reports whenever a stack overflow happens, you can put this in main():
ShowCrashReports();
Under `make MODE=dbg` and `make MODE=asan` the unit testing framework
will now automatically print backtraces of memory allocations when
things like memory leaks happen. Bugs are now fixed in ASAN global
variable overrun detection. The memtrack and asan runtimes also handle
edge cases now. The new tools helped to identify a few memory leaks,
which are fixed by this change.
This change should fix an issue reported in #288 with ARG_MAX limits.
Fixing this doubled the performance of MKDEPS.COM and AR.COM yet again.
79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
#ifndef COSMOPOLITAN_LIBC_RUNTIME_STACK_H_
|
|
#define COSMOPOLITAN_LIBC_RUNTIME_STACK_H_
|
|
#include "ape/config.h"
|
|
#include "libc/dce.h"
|
|
#if !(__ASSEMBLER__ + __LINKER__ + 0)
|
|
|
|
/**
|
|
* Tunes APE stack maximum size.
|
|
*
|
|
* This defaults to `STACKSIZE`. The bottom-most page will be protected
|
|
* to ensure your stack does not magically grow beyond this value. It's
|
|
* possible to detect stack overflows, by calling `ShowCrashReports()`.
|
|
*
|
|
* If you want to know how much stack your programs needs, then
|
|
*
|
|
* STATIC_YOINK("stack_usage_logging");
|
|
*
|
|
* will install an atexit() handler that appends to `o/$MODE/stack.log`
|
|
*
|
|
* @see libc/sysv/systemfive.S
|
|
* @see ape/ape.lds
|
|
*/
|
|
#define STATIC_STACK_SIZE(BYTES) \
|
|
STATIC_SYMBOL("ape_stack_memsz", _STACK_STRINGIFY(BYTES) _STACK_EXTRA)
|
|
|
|
/**
|
|
* Tunes APE stack virtual address.
|
|
*
|
|
* This defaults to `0x700000000000 - STACKSIZE`. The value defined by
|
|
* this macro will be respected, with two exceptions: (1) in MODE=tiny
|
|
* the operating system provided stack is used instead and (2) Windows
|
|
* Seven doesn't support 64-bit addresses so 0x10000000 - GetStackSize
|
|
* is used instead.
|
|
*
|
|
* @see libc/sysv/systemfive.S
|
|
* @see libc/nt/winmain.greg.c
|
|
* @see ape/ape.lds
|
|
*/
|
|
#define STATIC_STACK_ADDR(ADDR) \
|
|
STATIC_SYMBOL("ape_stack_vaddr", _STACK_STRINGIFY(ADDR))
|
|
|
|
#define _STACK_STRINGIFY(ADDR) #ADDR
|
|
|
|
#if IsAsan()
|
|
#define _STACK_EXTRA "*2"
|
|
#else
|
|
#define _STACK_EXTRA ""
|
|
#endif
|
|
|
|
#if defined(__GNUC__) && defined(__ELF__)
|
|
COSMOPOLITAN_C_START_
|
|
|
|
extern char ape_stack_memsz[] __attribute__((__weak__));
|
|
|
|
#define GetStackSize() ((uintptr_t)ape_stack_memsz)
|
|
|
|
/**
|
|
* Returns address of bottom of stack.
|
|
*/
|
|
#define GetStackAddr(ADDEND) \
|
|
(((intptr_t)__builtin_frame_address(0) & -GetStackSize()) + (ADDEND))
|
|
|
|
/**
|
|
* Returns preferred bottom address of stack.
|
|
*/
|
|
#define GetStaticStackAddr(ADDEND) \
|
|
({ \
|
|
intptr_t vAddr = 0; \
|
|
asm(".weak\tape_stack_vaddr\n\t" \
|
|
"movabs\t%1+ape_stack_vaddr,%0" \
|
|
: "=r"(vAddr) \
|
|
: "i"(ADDEND)); \
|
|
vAddr; \
|
|
})
|
|
|
|
COSMOPOLITAN_C_END_
|
|
#endif /* GNU ELF */
|
|
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
|
|
#endif /* COSMOPOLITAN_LIBC_RUNTIME_STACK_H_ */
|