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https://github.com/jart/cosmopolitan.git
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ead3fc2b31
It turned out that specifying all SRCS and INCS as dependencies on the pattern rules for all headers, caused `make` memory usage to skyrocket from 40mb ot 160mb. This change also reduces the build graph another 4%.
62 lines
2.9 KiB
C
62 lines
2.9 KiB
C
#ifndef COSMOPOLITAN_LIBC_LOG_GDB_H_
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#define COSMOPOLITAN_LIBC_LOG_GDB_H_
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#include "libc/calls/calls.h"
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#include "libc/calls/wait4.h"
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#include "libc/dce.h"
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#include "libc/sysv/consts/nr.h"
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#include "libc/sysv/consts/w.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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/**
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* @fileoverview GDB Attach Support Code.
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*
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* The goal of these macros is to make the backtrace into the failing
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* code as short as possible. It also helps avoid GDB getting confused
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* about how we don't use its readability destroying unwind directives.
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*/
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extern volatile int g_gdbsync;
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int gdbexec(const char *);
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int AttachDebugger(intptr_t);
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#define AttachDebugger(CONTINUE_TO_ADDR) /* shorten backtraces */ \
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SYNCHRONIZE_DEBUGGER((AttachDebugger)(CONTINUE_TO_ADDR))
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#define SYNCHRONIZE_DEBUGGER(PID) \
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({ \
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int Rc, Pid = (PID); \
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if (Pid != -1) { \
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while ((Rc = __inline_wait4(Pid, NULL, WNOHANG, NULL)) == 0) { \
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if (g_gdbsync) { \
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g_gdbsync = 0; \
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if (Rc > 0) Pid = 0; \
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break; \
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} else { \
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sched_yield(); \
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} \
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} \
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} \
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Pid; \
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})
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#define __inline_wait4(PID, OPT_OUT_WSTATUS, OPTIONS, OPT_OUT_RUSAGE) \
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({ \
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int64_t WaAx; \
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if (!IsWindows()) { \
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asm volatile("mov\t%5,%%r10\n\t" \
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"syscall" \
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: "=a"(WaAx) \
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: "0"(__NR_wait4), "D"(PID), "S"(OPT_OUT_WSTATUS), \
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"d"(OPTIONS), "g"(OPT_OUT_RUSAGE) \
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: "rcx", "r8", "r9", "r10", "r11", "memory", "cc"); \
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} else { \
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WaAx = sys_wait4_nt(PID, OPT_OUT_WSTATUS, OPTIONS, OPT_OUT_RUSAGE); \
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} \
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WaAx; \
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})
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_LOG_GDB_H_ */
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