gcc/libgo/runtime/print.c

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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 <complex.h>
#include <math.h>
#include <stdarg.h>
#include "runtime.h"
#include "array.h"
#include "go-type.h"
//static Lock debuglock;
// Clang requires this function to not be inlined (see below).
static void go_vprintf(const char*, va_list)
__attribute__((noinline));
// write to goroutine-local buffer if diverting output,
// or else standard error.
static void
gwrite(const void *v, intgo n)
{
G* g = runtime_g();
if(g == nil || g->writebuf == nil) {
// Avoid -D_FORTIFY_SOURCE problems.
int rv __attribute__((unused));
rv = runtime_write(2, v, n);
return;
}
if(g->writenbuf == 0)
return;
if(n > g->writenbuf)
n = g->writenbuf;
runtime_memmove(g->writebuf, v, n);
g->writebuf += n;
g->writenbuf -= n;
}
void
runtime_dump(byte *p, int32 n)
{
int32 i;
for(i=0; i<n; i++) {
runtime_printpointer((byte*)(uintptr)(p[i]>>4));
runtime_printpointer((byte*)(uintptr)(p[i]&0xf));
if((i&15) == 15)
runtime_prints("\n");
else
runtime_prints(" ");
}
if(n & 15)
runtime_prints("\n");
}
void
runtime_prints(const char *s)
{
gwrite(s, runtime_findnull((const byte*)s));
}
#if defined (__clang__) && (defined (__i386__) || defined (__x86_64__))
// LLVM's code generator does not currently support split stacks for vararg
// functions, so we disable the feature for this function under Clang. This
// appears to be OK as long as:
// - this function only calls non-inlined, internal-linkage (hence no dynamic
// loader) functions compiled with split stacks (i.e. go_vprintf), which can
// allocate more stack space as required;
// - this function itself does not occupy more than BACKOFF bytes of stack space
// (see libgcc/config/i386/morestack.S).
// These conditions are currently known to be satisfied by Clang on x86-32 and
// x86-64. Note that signal handlers receive slightly less stack space than they
// would normally do if they happen to be called while this function is being
// run. If this turns out to be a problem we could consider increasing BACKOFF.
void
runtime_printf(const char *s, ...)
__attribute__((no_split_stack));
#endif
void
runtime_printf(const char *s, ...)
{
va_list va;
va_start(va, s);
go_vprintf(s, va);
va_end(va);
}
// Very simple printf. Only for debugging prints.
// Do not add to this without checking with Rob.
static void
go_vprintf(const char *s, va_list va)
{
const char *p, *lp;
//runtime_lock(&debuglock);
lp = p = s;
for(; *p; p++) {
if(*p != '%')
continue;
if(p > lp)
gwrite(lp, p-lp);
p++;
switch(*p) {
case 'a':
runtime_printslice(va_arg(va, Slice));
break;
case 'c':
runtime_printbyte(va_arg(va, int32));
break;
case 'd':
runtime_printint(va_arg(va, int32));
break;
case 'D':
runtime_printint(va_arg(va, int64));
break;
case 'e':
runtime_printeface(va_arg(va, Eface));
break;
case 'f':
runtime_printfloat(va_arg(va, float64));
break;
case 'C':
runtime_printcomplex(va_arg(va, complex double));
break;
case 'i':
runtime_printiface(va_arg(va, Iface));
break;
case 'p':
runtime_printpointer(va_arg(va, void*));
break;
case 's':
runtime_prints(va_arg(va, char*));
break;
case 'S':
runtime_printstring(va_arg(va, String));
break;
case 't':
runtime_printbool(va_arg(va, int));
break;
case 'U':
runtime_printuint(va_arg(va, uint64));
break;
case 'x':
runtime_printhex(va_arg(va, uint32));
break;
case 'X':
runtime_printhex(va_arg(va, uint64));
break;
}
lp = p+1;
}
if(p > lp)
gwrite(lp, p-lp);
//runtime_unlock(&debuglock);
}
void
runtime_printpc(void *p __attribute__ ((unused)))
{
runtime_prints("PC=");
runtime_printhex((uint64)(uintptr)runtime_getcallerpc(p));
}
void
runtime_printbool(_Bool v)
{
if(v) {
gwrite("true", 4);
return;
}
gwrite("false", 5);
}
void
runtime_printbyte(int8 c)
{
gwrite(&c, 1);
}
void
runtime_printfloat(double v)
{
byte buf[20];
int32 e, s, i, n;
float64 h;
if(ISNAN(v)) {
gwrite("NaN", 3);
return;
}
if(isinf(v)) {
if(signbit(v)) {
gwrite("-Inf", 4);
} else {
gwrite("+Inf", 4);
}
return;
}
n = 7; // digits printed
e = 0; // exp
s = 0; // sign
if(v == 0) {
if(isinf(1/v) && 1/v < 0)
s = 1;
} else {
// sign
if(v < 0) {
v = -v;
s = 1;
}
// normalize
while(v >= 10) {
e++;
v /= 10;
}
while(v < 1) {
e--;
v *= 10;
}
// round
h = 5;
for(i=0; i<n; i++)
h /= 10;
v += h;
if(v >= 10) {
e++;
v /= 10;
}
}
// format +d.dddd+edd
buf[0] = '+';
if(s)
buf[0] = '-';
for(i=0; i<n; i++) {
s = v;
buf[i+2] = s+'0';
v -= s;
v *= 10.;
}
buf[1] = buf[2];
buf[2] = '.';
buf[n+2] = 'e';
buf[n+3] = '+';
if(e < 0) {
e = -e;
buf[n+3] = '-';
}
buf[n+4] = (e/100) + '0';
buf[n+5] = (e/10)%10 + '0';
buf[n+6] = (e%10) + '0';
gwrite(buf, n+7);
}
void
runtime_printcomplex(complex double v)
{
gwrite("(", 1);
runtime_printfloat(creal(v));
runtime_printfloat(cimag(v));
gwrite("i)", 2);
}
void
runtime_printuint(uint64 v)
{
byte buf[100];
int32 i;
for(i=nelem(buf)-1; i>0; i--) {
buf[i] = v%10 + '0';
if(v < 10)
break;
v = v/10;
}
gwrite(buf+i, nelem(buf)-i);
}
void
runtime_printint(int64 v)
{
if(v < 0) {
gwrite("-", 1);
v = -v;
}
runtime_printuint(v);
}
void
runtime_printhex(uint64 v)
{
static const char *dig = "0123456789abcdef";
byte buf[100];
int32 i;
i=nelem(buf);
for(; v>0; v/=16)
buf[--i] = dig[v%16];
if(i == nelem(buf))
buf[--i] = '0';
buf[--i] = 'x';
buf[--i] = '0';
gwrite(buf+i, nelem(buf)-i);
}
void
runtime_printpointer(void *p)
{
runtime_printhex((uintptr)p);
}
void
runtime_printstring(String v)
{
// if(v.len > runtime_maxstring) {
// gwrite("[string too long]", 17);
// return;
// }
if(v.len > 0)
gwrite(v.str, v.len);
}
void
__go_print_space(void)
{
gwrite(" ", 1);
}
void
__go_print_nl(void)
{
gwrite("\n", 1);
}