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// go-diagnostics.cc -- Go error/warning diagnostics utilities.
// Copyright 2016 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 "go-diagnostics.h"
static std::string
mformat_value()
{
return std::string(xstrerror(errno));
}
// Rewrite a format string to expand any extensions not
// supported by sprintf(). See comments in go-diagnostics.h
// for list of supported format specifiers.
static std::string
expand_format(const char* fmt)
{
std::stringstream ss;
for (const char* c = fmt; *c; ++c)
{
if (*c != '%')
{
ss << *c;
continue;
}
c++;
switch (*c)
{
case '\0':
{
// malformed format string
go_unreachable();
}
case '%':
{
ss << "%";
break;
}
case 'm':
{
ss << mformat_value();
break;
}
case '<':
{
ss << go_open_quote();
break;
}
case '>':
{
ss << go_close_quote();
break;
}
case 'q':
{
ss << go_open_quote();
c++;
if (*c == 'm')
{
ss << mformat_value();
}
else
{
ss << "%" << *c;
}
ss << go_close_quote();
break;
}
default:
{
ss << "%" << *c;
}
}
}
return ss.str();
}
// Expand message format specifiers, using a combination of
// expand_format above to handle extensions (ex: %m, %q) and vasprintf()
// to handle regular printf-style formatting. A pragma is being used here to
// suppress this warning:
//
// warning: function ‘std::__cxx11::string expand_message(const char*, __va_list_tag*)’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]
//
// What appears to be happening here is that the checker is deciding that
// because of the call to vasprintf() (which has attribute gnu_printf), the
// calling function must need to have attribute gnu_printf as well, even
// though there is already an attribute declaration for it.
static std::string
expand_message(const char* fmt, va_list ap) GO_ATTRIBUTE_GCC_DIAG(1,0);
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wsuggest-attribute=format"
static std::string
expand_message(const char* fmt, va_list ap)
{
char* mbuf = 0;
std::string expanded_fmt = expand_format(fmt);
int nwr = vasprintf(&mbuf, expanded_fmt.c_str(), ap);
if (nwr == -1)
{
// memory allocation failed
go_be_error_at(Linemap::unknown_location(),
"memory allocation failed in vasprintf");
go_assert(0);
}
std::string rval = std::string(mbuf);
free(mbuf);
return rval;
}
#pragma GCC diagnostic pop
static const char* cached_open_quote = NULL;
static const char* cached_close_quote = NULL;
const char*
go_open_quote()
{
if (cached_open_quote == NULL)
go_be_get_quotechars(&cached_open_quote, &cached_close_quote);
return cached_open_quote;
}
const char*
go_close_quote()
{
if (cached_close_quote == NULL)
go_be_get_quotechars(&cached_open_quote, &cached_close_quote);
return cached_close_quote;
}
void
go_error_at(const Location location, const char* fmt, ...)
{
va_list ap;
va_start(ap, fmt);
go_be_error_at(location, expand_message(fmt, ap));
va_end(ap);
}
void
go_warning_at(const Location location, int opt, const char* fmt, ...)
{
va_list ap;
va_start(ap, fmt);
go_be_warning_at(location, opt, expand_message(fmt, ap));
va_end(ap);
}
void
go_fatal_error(const Location location, const char* fmt, ...)
{
va_list ap;
va_start(ap, fmt);
go_be_fatal_error(location, expand_message(fmt, ap));
va_end(ap);
}
void
go_inform(const Location location, const char* fmt, ...)
{
va_list ap;
va_start(ap, fmt);
go_be_inform(location, expand_message(fmt, ap));
va_end(ap);
}
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