f6b1e65ec3
PR go/46986 all: prepend #__USER_LABEL_PREFIX__ to mangled Go symbols For old-fashioned Darwin. From-SVN: r195438
102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
/* go-fieldtrack.c -- structure field data analysis.
|
|
|
|
Copyright 2012 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 "runtime.h"
|
|
#include "go-type.h"
|
|
#include "map.h"
|
|
|
|
/* The compiler will track fields that have the tag go:"track". Any
|
|
function that refers to such a field will call this function with a
|
|
string
|
|
fieldtrack "package.type.field"
|
|
|
|
This function does not actually do anything. Instead, we gather
|
|
the field tracking information by looking for strings of that form
|
|
in the read-only data section. This is, of course, a horrible
|
|
hack, but it's good enough for now. We can improve it, e.g., by a
|
|
linker plugin, if this turns out to be useful. */
|
|
|
|
void
|
|
__go_fieldtrack (byte *p __attribute__ ((unused)))
|
|
{
|
|
}
|
|
|
|
/* A runtime function to add all the tracked fields to a
|
|
map[string]bool. */
|
|
|
|
extern const char _etext[] __attribute__ ((weak));
|
|
extern const char __etext[] __attribute__ ((weak));
|
|
extern const char __data_start[] __attribute__ ((weak));
|
|
extern const char _edata[] __attribute__ ((weak));
|
|
extern const char __edata[] __attribute__ ((weak));
|
|
extern const char __bss_start[] __attribute__ ((weak));
|
|
|
|
void runtime_Fieldtrack (struct __go_map *) __asm__ (GOSYM_PREFIX "runtime.Fieldtrack");
|
|
|
|
void
|
|
runtime_Fieldtrack (struct __go_map *m)
|
|
{
|
|
const char *p;
|
|
const char *pend;
|
|
const char *prefix;
|
|
size_t prefix_len;
|
|
|
|
p = __data_start;
|
|
if (p == NULL)
|
|
p = __etext;
|
|
if (p == NULL)
|
|
p = _etext;
|
|
if (p == NULL)
|
|
return;
|
|
|
|
pend = __edata;
|
|
if (pend == NULL)
|
|
pend = _edata;
|
|
if (pend == NULL)
|
|
pend = __bss_start;
|
|
if (pend == NULL)
|
|
return;
|
|
|
|
prefix = "fieldtrack ";
|
|
prefix_len = __builtin_strlen (prefix);
|
|
|
|
while (p < pend)
|
|
{
|
|
const char *q1;
|
|
const char *q2;
|
|
|
|
q1 = __builtin_memchr (p + prefix_len, '"', pend - (p + prefix_len));
|
|
if (q1 == NULL)
|
|
break;
|
|
|
|
if (__builtin_memcmp (q1 - prefix_len, prefix, prefix_len) != 0)
|
|
{
|
|
p = q1 + 1;
|
|
continue;
|
|
}
|
|
|
|
q1++;
|
|
q2 = __builtin_memchr (q1, '"', pend - q1);
|
|
if (q2 == NULL)
|
|
break;
|
|
|
|
if (__builtin_memchr (q1, '\0', q2 - q1) == NULL)
|
|
{
|
|
String s;
|
|
void *v;
|
|
_Bool *pb;
|
|
|
|
s.str = (const byte *) q1;
|
|
s.len = q2 - q1;
|
|
v = __go_map_index (m, &s, 1);
|
|
pb = (_Bool *) v;
|
|
*pb = 1;
|
|
}
|
|
|
|
p = q2;
|
|
}
|
|
}
|