373 lines
6.3 KiB
C
373 lines
6.3 KiB
C
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include <complex.h>
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#include <math.h>
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#include <stdarg.h>
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#include "runtime.h"
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#include "array.h"
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#include "go-type.h"
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//static Lock debuglock;
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// Clang requires this function to not be inlined (see below).
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static void go_vprintf(const char*, va_list)
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__attribute__((noinline));
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// write to goroutine-local buffer if diverting output,
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// or else standard error.
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static void
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gwrite(const void *v, intgo n)
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{
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G* g = runtime_g();
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if(g == nil || g->writebuf == nil) {
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// Avoid -D_FORTIFY_SOURCE problems.
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int rv __attribute__((unused));
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rv = runtime_write(2, v, n);
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return;
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}
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if(g->writenbuf == 0)
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return;
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if(n > g->writenbuf)
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n = g->writenbuf;
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runtime_memmove(g->writebuf, v, n);
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g->writebuf += n;
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g->writenbuf -= n;
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}
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void
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runtime_dump(byte *p, int32 n)
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{
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int32 i;
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for(i=0; i<n; i++) {
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runtime_printpointer((byte*)(uintptr)(p[i]>>4));
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runtime_printpointer((byte*)(uintptr)(p[i]&0xf));
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if((i&15) == 15)
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runtime_prints("\n");
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else
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runtime_prints(" ");
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}
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if(n & 15)
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runtime_prints("\n");
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}
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void
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runtime_prints(const char *s)
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{
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gwrite(s, runtime_findnull((const byte*)s));
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}
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#if defined (__clang__) && (defined (__i386__) || defined (__x86_64__))
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// LLVM's code generator does not currently support split stacks for vararg
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// functions, so we disable the feature for this function under Clang. This
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// appears to be OK as long as:
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// - this function only calls non-inlined, internal-linkage (hence no dynamic
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// loader) functions compiled with split stacks (i.e. go_vprintf), which can
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// allocate more stack space as required;
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// - this function itself does not occupy more than BACKOFF bytes of stack space
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// (see libgcc/config/i386/morestack.S).
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// These conditions are currently known to be satisfied by Clang on x86-32 and
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// x86-64. Note that signal handlers receive slightly less stack space than they
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// would normally do if they happen to be called while this function is being
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// run. If this turns out to be a problem we could consider increasing BACKOFF.
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void
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runtime_printf(const char *s, ...)
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__attribute__((no_split_stack));
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int32
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runtime_snprintf(byte *buf, int32 n, const char *s, ...)
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__attribute__((no_split_stack));
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#endif
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void
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runtime_printf(const char *s, ...)
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{
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va_list va;
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va_start(va, s);
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go_vprintf(s, va);
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va_end(va);
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}
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int32
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runtime_snprintf(byte *buf, int32 n, const char *s, ...)
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{
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G *g = runtime_g();
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va_list va;
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int32 m;
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g->writebuf = buf;
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g->writenbuf = n-1;
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va_start(va, s);
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go_vprintf(s, va);
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va_end(va);
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*g->writebuf = '\0';
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m = g->writebuf - buf;
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g->writenbuf = 0;
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g->writebuf = nil;
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return m;
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}
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// Very simple printf. Only for debugging prints.
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// Do not add to this without checking with Rob.
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static void
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go_vprintf(const char *s, va_list va)
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{
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const char *p, *lp;
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//runtime_lock(&debuglock);
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lp = p = s;
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for(; *p; p++) {
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if(*p != '%')
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continue;
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if(p > lp)
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gwrite(lp, p-lp);
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p++;
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switch(*p) {
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case 'a':
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runtime_printslice(va_arg(va, Slice));
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break;
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case 'c':
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runtime_printbyte(va_arg(va, int32));
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break;
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case 'd':
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runtime_printint(va_arg(va, int32));
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break;
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case 'D':
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runtime_printint(va_arg(va, int64));
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break;
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case 'e':
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runtime_printeface(va_arg(va, Eface));
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break;
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case 'f':
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runtime_printfloat(va_arg(va, float64));
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break;
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case 'C':
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runtime_printcomplex(va_arg(va, complex double));
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break;
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case 'i':
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runtime_printiface(va_arg(va, Iface));
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break;
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case 'p':
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runtime_printpointer(va_arg(va, void*));
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break;
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case 's':
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runtime_prints(va_arg(va, char*));
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break;
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case 'S':
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runtime_printstring(va_arg(va, String));
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break;
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case 't':
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runtime_printbool(va_arg(va, int));
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break;
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case 'U':
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runtime_printuint(va_arg(va, uint64));
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break;
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case 'x':
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runtime_printhex(va_arg(va, uint32));
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break;
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case 'X':
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runtime_printhex(va_arg(va, uint64));
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break;
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}
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lp = p+1;
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}
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if(p > lp)
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gwrite(lp, p-lp);
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//runtime_unlock(&debuglock);
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}
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void
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runtime_printpc(void *p __attribute__ ((unused)))
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{
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runtime_prints("PC=");
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runtime_printhex((uint64)(uintptr)runtime_getcallerpc(p));
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}
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void
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runtime_printbool(_Bool v)
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{
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if(v) {
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gwrite("true", 4);
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return;
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}
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gwrite("false", 5);
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}
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void
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runtime_printbyte(int8 c)
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{
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gwrite(&c, 1);
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}
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void
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runtime_printfloat(double v)
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{
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byte buf[20];
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int32 e, s, i, n;
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float64 h;
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if(ISNAN(v)) {
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gwrite("NaN", 3);
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return;
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}
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if(isinf(v)) {
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if(signbit(v)) {
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gwrite("-Inf", 4);
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} else {
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gwrite("+Inf", 4);
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}
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return;
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}
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n = 7; // digits printed
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e = 0; // exp
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s = 0; // sign
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if(v == 0) {
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if(isinf(1/v) && 1/v < 0)
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s = 1;
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} else {
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// sign
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if(v < 0) {
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v = -v;
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s = 1;
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}
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// normalize
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while(v >= 10) {
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e++;
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v /= 10;
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}
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while(v < 1) {
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e--;
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v *= 10;
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}
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// round
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h = 5;
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for(i=0; i<n; i++)
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h /= 10;
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v += h;
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if(v >= 10) {
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e++;
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v /= 10;
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}
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}
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// format +d.dddd+edd
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buf[0] = '+';
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if(s)
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buf[0] = '-';
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for(i=0; i<n; i++) {
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s = v;
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buf[i+2] = s+'0';
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v -= s;
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v *= 10.;
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}
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buf[1] = buf[2];
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buf[2] = '.';
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buf[n+2] = 'e';
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buf[n+3] = '+';
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if(e < 0) {
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e = -e;
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buf[n+3] = '-';
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}
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buf[n+4] = (e/100) + '0';
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buf[n+5] = (e/10)%10 + '0';
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buf[n+6] = (e%10) + '0';
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gwrite(buf, n+7);
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}
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void
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runtime_printcomplex(complex double v)
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{
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gwrite("(", 1);
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runtime_printfloat(creal(v));
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runtime_printfloat(cimag(v));
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gwrite("i)", 2);
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}
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void
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runtime_printuint(uint64 v)
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{
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byte buf[100];
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int32 i;
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for(i=nelem(buf)-1; i>0; i--) {
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buf[i] = v%10 + '0';
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if(v < 10)
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break;
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v = v/10;
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}
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gwrite(buf+i, nelem(buf)-i);
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}
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void
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runtime_printint(int64 v)
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{
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if(v < 0) {
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gwrite("-", 1);
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v = -v;
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}
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runtime_printuint(v);
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}
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void
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runtime_printhex(uint64 v)
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{
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static const char *dig = "0123456789abcdef";
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byte buf[100];
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int32 i;
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i=nelem(buf);
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for(; v>0; v/=16)
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buf[--i] = dig[v%16];
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if(i == nelem(buf))
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buf[--i] = '0';
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buf[--i] = 'x';
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buf[--i] = '0';
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gwrite(buf+i, nelem(buf)-i);
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}
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void
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runtime_printpointer(void *p)
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{
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runtime_printhex((uintptr)p);
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}
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void
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runtime_printstring(String v)
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{
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// if(v.len > runtime_maxstring) {
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// gwrite("[string too long]", 17);
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// return;
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// }
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if(v.len > 0)
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gwrite(v.str, v.len);
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}
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void
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__go_print_space(void)
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{
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gwrite(" ", 1);
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}
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void
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__go_print_nl(void)
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{
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gwrite("\n", 1);
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}
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