mirror of
https://github.com/jart/cosmopolitan.git
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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.
81 lines
3.2 KiB
ArmAsm
81 lines
3.2 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.internal.h"
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#include "libc/dce.h"
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#include "libc/notice.inc"
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#define INITIAL_CAPACITY 4
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// Invokes deferred function calls.
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//
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// This offers behavior similar to std::unique_ptr. Functions
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// overwrite their return addresses jumping here, and pushing
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// exactly one entry on the shadow stack below. Functions may
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// repeat that process multiple times, in which case the body
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// of this gadget loops and unwinds as a natural consequence.
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//
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// @param rax,rdx,xmm0,xmm1,st0,st1 is return value
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// @see test/libc/runtime/gc_test.c
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nop # backtrace workaround
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// <LIMBO>
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__gc: decq __garbage(%rip)
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mov __garbage(%rip),%r8
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mov __garbage+16(%rip),%r9
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js 9f
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shl $5,%r8
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lea (%r9,%r8),%r8
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mov 8(%r8),%r9
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mov 16(%r8),%rdi
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push 24(%r8)
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// </LIMBO>
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push %rbp
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mov %rsp,%rbp
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sub $16,%rsp
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push %rax
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push %rdx
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movdqa %xmm0,-16(%rbp)
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call *%r9
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movdqa -16(%rbp),%xmm0
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pop %rdx
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pop %rax
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leave
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ret
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9: hlt
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.endfn __gc,globl,hidden
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.source __FILE__
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.bss
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.align 8
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__garbage:
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.quad 0 # garbage.i
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.quad 0 # garbage.n
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.quad 0 # garbage.p
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.rept INITIAL_CAPACITY
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.quad 0 # garbage.p[𝑖].frame
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.quad 0 # garbage.p[𝑖].fn
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.quad 0 # garbage.p[𝑖].arg
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.quad 0 # garbage.p[𝑖].ret
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.endr
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.endobj __garbage,globl,hidden
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.previous
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.init.start 100,_init_garbage
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movb $INITIAL_CAPACITY,__garbage+8(%rip)
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movl $__garbage+24,__garbage+16(%rip)
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.init.end 100,_init_garbage
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