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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include <unistd.h>
#include "runtime.h"
#include "array.h"
#include "go-panic.h"
#include "go-string.h"
uint32 runtime_panicking;
int32
runtime_gotraceback(void)
{
const byte *p;
p = runtime_getenv("GOTRACEBACK");
if(p == nil || p[0] == '\0')
return 1; // default is on
return runtime_atoi(p);
}
static Lock paniclk;
void
runtime_startpanic(void)
{
M *m;
m = runtime_m();
if(m->dying) {
runtime_printf("panic during panic\n");
runtime_exit(3);
}
m->dying = 1;
runtime_xadd(&runtime_panicking, 1);
runtime_lock(&paniclk);
}
void
runtime_dopanic(int32 unused __attribute__ ((unused)))
{
G* g;
static bool didothers;
g = runtime_g();
if(g->sig != 0)
runtime_printf("[signal %x code=%p addr=%p]\n",
g->sig, (void*)(g->sigcode0), (void*)(g->sigcode1));
if(runtime_gotraceback()){
if(g != runtime_m()->g0) {
runtime_printf("\n");
runtime_goroutineheader(g);
runtime_traceback();
runtime_goroutinetrailer(g);
}
if(!didothers) {
didothers = true;
runtime_tracebackothers(g);
}
}
runtime_unlock(&paniclk);
if(runtime_xadd(&runtime_panicking, -1) != 0) {
// Some other m is panicking too.
// Let it print what it needs to print.
// Wait forever without chewing up cpu.
// It will exit when it's done.
static Lock deadlock;
runtime_lock(&deadlock);
runtime_lock(&deadlock);
}
runtime_exit(2);
}
void
runtime_throw(const char *s)
{
runtime_startpanic();
runtime_printf("throw: %s\n", s);
runtime_dopanic(0);
*(int32*)0 = 0; // not reached
runtime_exit(1); // even more not reached
}
void
runtime_panicstring(const char *s)
{
Eface err;
if(runtime_m()->gcing) {
runtime_printf("panic: %s\n", s);
runtime_throw("panic during gc");
}
runtime_newErrorString(runtime_gostringnocopy((const byte*)s), &err);
runtime_panic(err);
}
static int32 argc;
static byte** argv;
extern Slice os_Args asm ("os.Args");
extern Slice syscall_Envs asm ("syscall.Envs");
void
runtime_args(int32 c, byte **v)
{
argc = c;
argv = v;
}
void
runtime_goargs(void)
{
String *s;
int32 i;
// for windows implementation see "os" package
if(Windows)
return;
s = runtime_malloc(argc*sizeof s[0]);
for(i=0; i<argc; i++)
s[i] = runtime_gostringnocopy((const byte*)argv[i]);
os_Args.__values = (void*)s;
os_Args.__count = argc;
os_Args.__capacity = argc;
}
void
runtime_goenvs_unix(void)
{
String *s;
int32 i, n;
for(n=0; argv[argc+1+n] != 0; n++)
;
s = runtime_malloc(n*sizeof s[0]);
for(i=0; i<n; i++)
s[i] = runtime_gostringnocopy(argv[argc+1+i]);
syscall_Envs.__values = (void*)s;
syscall_Envs.__count = n;
syscall_Envs.__capacity = n;
}
const byte*
runtime_getenv(const char *s)
{
int32 i, j, len;
const byte *v, *bs;
String* envv;
int32 envc;
bs = (const byte*)s;
len = runtime_findnull(bs);
envv = (String*)syscall_Envs.__values;
envc = syscall_Envs.__count;
for(i=0; i<envc; i++){
if(envv[i].__length <= len)
continue;
v = (const byte*)envv[i].__data;
for(j=0; j<len; j++)
if(bs[j] != v[j])
goto nomatch;
if(v[len] != '=')
goto nomatch;
return v+len+1;
nomatch:;
}
return nil;
}
int32
runtime_atoi(const byte *p)
{
int32 n;
n = 0;
while('0' <= *p && *p <= '9')
n = n*10 + *p++ - '0';
return n;
}
uint32
runtime_fastrand1(void)
{
M *m;
uint32 x;
m = runtime_m();
x = m->fastrand;
x += x;
if(x & 0x80000000L)
x ^= 0x88888eefUL;
m->fastrand = x;
return x;
}
static struct root_list runtime_roots =
{ nil,
{ { &syscall_Envs, sizeof syscall_Envs },
{ &os_Args, sizeof os_Args },
{ nil, 0 } },
};
void
runtime_check(void)
{
__go_register_gc_roots(&runtime_roots);
}
int64
runtime_cputicks(void)
{
#if defined(__386__) || defined(__x86_64__)
uint32 low, high;
asm("rdtsc" : "=a" (low), "=d" (high));
return (int64)(((uint64)high << 32) | (uint64)low);
#else
// FIXME: implement for other processors.
return 0;
#endif
}
bool
runtime_showframe(const unsigned char *s)
{
static int32 traceback = -1;
if(traceback < 0)
traceback = runtime_gotraceback();
return traceback > 1 || (__builtin_strchr((const char*)s, '.') != nil && __builtin_memcmp(s, "runtime.", 7) != 0);
}
bool
runtime_isInf(float64 f, int32 sign)
{
if(!__builtin_isinf(f))
return false;
if(sign == 0)
return true;
if(sign > 0)
return f > 0;
return f < 0;
}
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