/usr/lib/gcc/x86_64-linux-gnu/6/include/d/core/sys/freebsd/execinfo.d is in libgphobos-6-dev 6.4.0-17ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 | /**
* FreeBSD implementation of glibc's $(LINK2 http://www.gnu.org/software/libc/manual/html_node/Backtraces.html backtrace) facility.
*
* Copyright: Copyright Martin Nowak 2012.
* License: $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
* Authors: Martin Nowak
* Source: $(DRUNTIMESRC core/sys/freebsd/_execinfo.d)
*/
module core.sys.freebsd.execinfo;
version (FreeBSD):
extern (C):
nothrow:
import core.sys.freebsd.dlfcn;
// Use extern (D) so that these functions don't collide with libexecinfo.
extern (D) int backtrace(void** buffer, int size)
{
import core.thread : thread_stackBottom;
void** p, pend=cast(void**)thread_stackBottom();
version (D_InlineAsm_X86)
asm nothrow @trusted { mov p[EBP], EBP; }
else version (D_InlineAsm_X86_64)
asm nothrow @trusted { mov p[RBP], RBP; }
else
static assert(false, "Architecture not supported.");
int i;
for (; i < size && p < pend; ++i)
{
buffer[i] = *(p + 1);
auto pnext = cast(void**)*p;
if (pnext <= p) break;
p = pnext;
}
return i;
}
extern (D) char** backtrace_symbols(const(void*)* buffer, int size)
{
static void* realloc(void* p, size_t len) nothrow
{
static import cstdlib=core.stdc.stdlib;
auto res = cstdlib.realloc(p, len);
if (res is null) cstdlib.free(p);
return res;
}
if (size <= 0) return null;
size_t pos = size * (char*).sizeof;
char** p = cast(char**)realloc(null, pos);
if (p is null) return null;
Dl_info info;
foreach (i, addr; buffer[0 .. size])
{
if (dladdr(addr, &info) == 0)
(cast(ubyte*)&info)[0 .. info.sizeof] = 0;
fixupDLInfo(addr, info);
immutable len = formatStackFrame(null, 0, addr, info);
assert(len > 0);
p = cast(char**)realloc(p, pos + len);
if (p is null) return null;
formatStackFrame(cast(char*)p + pos, len, addr, info) == len || assert(0);
p[i] = cast(char*)pos;
pos += len;
}
foreach (i; 0 .. size)
{
pos = cast(size_t)p[i];
p[i] = cast(char*)p + pos;
}
return p;
}
extern (D) void backtrace_symbols_fd(const(void*)* buffer, int size, int fd)
{
import core.sys.posix.unistd : write;
import core.stdc.stdlib : alloca;
if (size <= 0) return;
Dl_info info;
foreach (i, addr; buffer[0 .. size])
{
if (dladdr(addr, &info) == 0)
(cast(ubyte*)&info)[0 .. info.sizeof] = 0;
fixupDLInfo(addr, info);
enum maxAlloca = 1024;
enum min = (size_t a, size_t b) => a <= b ? a : b;
immutable len = min(formatStackFrame(null, 0, addr, info), maxAlloca);
assert(len > 0);
auto p = cast(char*)alloca(len);
if (p is null) return;
formatStackFrame(p, len, addr, info) >= len || assert(0);
p[len - 1] = '\n';
write(fd, p, len);
}
}
private void fixupDLInfo(const(void)* addr, ref Dl_info info)
{
if (info.dli_fname is null) info.dli_fname = "???";
if (info.dli_fbase is null) info.dli_fbase = null;
if (info.dli_sname is null) info.dli_sname = "???";
if (info.dli_saddr is null) info.dli_saddr = cast(void*)addr;
}
private size_t formatStackFrame(char* p, size_t plen, const(void)* addr, const ref Dl_info info)
{
import core.stdc.stdio : snprintf;
immutable off = addr - info.dli_saddr;
immutable len = snprintf(p, plen, "%p <%s+%zd> at %s",
addr, info.dli_sname, off, info.dli_fname);
assert(len > 0);
return cast(size_t)len + 1; // + '\0'
}
|