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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"
extern void runtime_printlock(void)
__asm__(GOSYM_PREFIX "runtime.printlock");
extern void runtime_printunlock(void)
__asm__(GOSYM_PREFIX "runtime.printunlock");
extern void gwrite(Slice)
__asm__(GOSYM_PREFIX "runtime.gwrite");
extern void runtime_printint(int64)
__asm__(GOSYM_PREFIX "runtime.printint");
extern void runtime_printuint(uint64)
__asm__(GOSYM_PREFIX "runtime.printuint");
extern void runtime_printhex(uint64)
__asm__(GOSYM_PREFIX "runtime.printhex");
extern void runtime_printfloat(float64)
__asm__(GOSYM_PREFIX "runtime.printfloat");
extern void runtime_printcomplex(complex double)
__asm__(GOSYM_PREFIX "runtime.printcomplex");
extern void runtime_printbool(_Bool)
__asm__(GOSYM_PREFIX "runtime.printbool");
extern void runtime_printstring(String)
__asm__(GOSYM_PREFIX "runtime.printstring");
extern void runtime_printpointer(void *)
__asm__(GOSYM_PREFIX "runtime.printpointer");
extern void runtime_printslice(Slice)
__asm__(GOSYM_PREFIX "runtime.printslice");
extern void runtime_printeface(Eface)
__asm__(GOSYM_PREFIX "runtime.printeface");
extern void runtime_printiface(Iface)
__asm__(GOSYM_PREFIX "runtime.printiface");
// Clang requires this function to not be inlined (see below).
static void go_vprintf(const char*, va_list)
__attribute__((noinline));
static void
runtime_prints(const char *s)
{
Slice sl;
// Use memcpy to avoid const-cast warning.
memcpy(&sl.__values, &s, sizeof(char*));
sl.__count = runtime_findnull((const byte*)s);
sl.__capacity = sl.__count;
gwrite(sl);
}
static void
runtime_printbyte(int8 c)
{
Slice sl;
sl.__values = &c;
sl.__count = 1;
sl.__capacity = 1;
gwrite(sl);
}
#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));
int32
runtime_snprintf(byte *buf, int32 n, 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);
}
int32
runtime_snprintf(byte *buf, int32 n, const char *s, ...)
{
G *g = runtime_g();
va_list va;
int32 m;
g->writebuf.__values = buf;
g->writebuf.__count = 0;
g->writebuf.__capacity = n-1;
va_start(va, s);
go_vprintf(s, va);
va_end(va);
m = g->writebuf.__count;
((byte*)g->writebuf.__values)[m] = '\0';
g->writebuf.__values = nil;
g->writebuf.__count = 0;
g->writebuf.__capacity = 0;
return m;
}
// 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;
Slice sl;
runtime_printlock();
lp = p = s;
for(; *p; p++) {
if(*p != '%')
continue;
if(p > lp) {
// Use memcpy to avoid const-cast warning.
memcpy(&sl.__values, &lp, sizeof(char*));
sl.__count = p - lp;
sl.__capacity = p - lp;
gwrite(sl);
}
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) {
// Use memcpy to avoid const-cast warning.
memcpy(&sl.__values, &lp, sizeof(char*));
sl.__count = p - lp;
sl.__capacity = p - lp;
gwrite(sl);
}
runtime_printunlock();
}
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