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/**
* 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:
version (GNU)
version = BacktraceExternal;
version (BacktraceExternal)
{
size_t backtrace(void**, size_t);
char** backtrace_symbols(const(void*)*, size_t);
void backtrace_symbols_fd(const(void*)*, size_t, int);
char** backtrace_symbols_fmt(const(void*)*, size_t, const char*);
int backtrace_symbols_fd_fmt(const(void*)*, size_t, int, const char*);
}
else
{
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 version (AArch64)
asm nothrow @trusted { "str x29, %0" : "=m" (p); }
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'
}
}
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