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/* Support for buffering diagnostics before flushing them to output sinks.
Copyright (C) 2024-2025 Free Software Foundation, Inc.
Contributed by David Malcolm <dmalcolm@redhat.com>.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "diagnostic.h"
#include "diagnostics/buffering.h"
#include "diagnostics/sink.h"
namespace diagnostics {
/* Methods fns of diagnostics::context relating to buffering. */
/* If BUFFER_ is non-null, use BUFFER as the active diagnostics::buffer on
this context. BUFFER is borrowed.
If BUFFER_ is null, stop any buffering on this context until the next call
to this function. */
void
context::set_diagnostic_buffer (buffer *buffer_)
{
/* We don't allow changing buffering within a diagnostic group
(to simplify handling of buffered diagnostics within the
diagnostic_format implementations). */
gcc_assert (m_diagnostic_groups.m_group_nesting_depth == 0);
/* Likewise, for simplicity, we only allow changing buffers
at nesting level 0. */
gcc_assert (m_diagnostic_groups.m_diagnostic_nesting_level == 0);
m_diagnostic_buffer = buffer_;
if (buffer_)
{
buffer_->ensure_per_sink_buffers ();
gcc_assert (buffer_->m_per_sink_buffers);
gcc_assert (buffer_->m_per_sink_buffers->length ()
== m_sinks.length ());
for (unsigned idx = 0; idx < m_sinks.length (); ++idx)
{
auto sink_ = m_sinks[idx];
auto per_sink_buffer = (*buffer_->m_per_sink_buffers)[idx];
sink_->set_buffer (per_sink_buffer);
}
}
else
for (auto sink_ : m_sinks)
sink_->set_buffer (nullptr);
}
/* Clear BUFFER_ without flushing it. */
void
context::clear_diagnostic_buffer (buffer &buffer_)
{
if (buffer_.m_per_sink_buffers)
for (auto per_sink_buffer_ : *buffer_.m_per_sink_buffers)
per_sink_buffer_->clear ();
buffer_.m_diagnostic_counters.clear ();
/* We need to reset last_location, otherwise we may skip caret lines
when we actually give a diagnostic. */
m_last_location = UNKNOWN_LOCATION;
}
/* Flush the diagnostics in BUFFER_ to this context, clearing BUFFER_. */
void
context::flush_diagnostic_buffer (buffer &buffer_)
{
bool had_errors
= (buffer_.diagnostic_count (kind::error) > 0
|| buffer_.diagnostic_count (kind::werror) > 0);
if (buffer_.m_per_sink_buffers)
for (auto per_sink_buffer_ : *buffer_.m_per_sink_buffers)
per_sink_buffer_->flush ();
buffer_.m_diagnostic_counters.move_to (m_diagnostic_counters);
action_after_output (had_errors ? kind::error : kind::warning);
check_max_errors (true);
}
/* class diagnostics::buffer. */
buffer::buffer (context &ctxt)
: m_ctxt (ctxt),
m_per_sink_buffers (nullptr)
{
}
buffer::~buffer ()
{
if (m_per_sink_buffers)
{
for (auto iter : *m_per_sink_buffers)
delete iter;
delete m_per_sink_buffers;
}
}
void
buffer::dump (FILE *out, int indent) const
{
m_diagnostic_counters.dump (out, indent + 2);
fprintf (out, "%*sm_per_sink_buffers:\n", indent, "");
if (m_per_sink_buffers)
for (auto per_sink_buffer_ : *m_per_sink_buffers)
per_sink_buffer_->dump (out, indent + 2);
else
fprintf (out, "%*s(none)\n", indent + 2, "");
}
bool
buffer::empty_p () const
{
if (m_per_sink_buffers)
for (auto per_sink_buffer_ : *m_per_sink_buffers)
/* Query initial buffer. */
return per_sink_buffer_->empty_p ();
return true;
}
void
buffer::move_to (buffer &dest)
{
/* Bail if there's nothing to move. */
if (!m_per_sink_buffers)
return;
m_diagnostic_counters.move_to (dest.m_diagnostic_counters);
if (!dest.m_per_sink_buffers)
{
/* Optimization for the "move to empty" case:
simply move the vec to the dest. */
dest.m_per_sink_buffers = m_per_sink_buffers;
m_per_sink_buffers = nullptr;
return;
}
dest.ensure_per_sink_buffers ();
gcc_assert (m_per_sink_buffers);
gcc_assert (m_per_sink_buffers->length ()
== m_ctxt.m_sinks.length ());
gcc_assert (dest.m_per_sink_buffers);
gcc_assert (dest.m_per_sink_buffers->length ()
== m_ctxt.m_sinks.length ());
for (unsigned idx = 0; idx < m_ctxt.m_sinks.length (); ++idx)
{
auto per_sink_buffer_src = (*m_per_sink_buffers)[idx];
auto per_sink_buffer_dest = (*dest.m_per_sink_buffers)[idx];
per_sink_buffer_src->move_to (*per_sink_buffer_dest);
}
}
/* Lazily get the output formats to create their own kind of buffers.
We can't change the output sinks on a context once this has been called
on any diagnostics::buffer instances for that context, since there's no
way to update all diagnostics::buffer instances for that context. */
void
buffer::ensure_per_sink_buffers ()
{
if (!m_per_sink_buffers)
{
m_per_sink_buffers = new auto_vec<per_sink_buffer *> ();
for (unsigned idx = 0; idx < m_ctxt.m_sinks.length (); ++idx)
{
auto sink_ = m_ctxt.m_sinks[idx];
auto per_sink_buffer = sink_->make_per_sink_buffer ();
m_per_sink_buffers->safe_push (per_sink_buffer.release ());
}
}
gcc_assert (m_per_sink_buffers);
gcc_assert (m_per_sink_buffers->length ()
== m_ctxt.m_sinks.length ());
}
} // namespace diagnostics
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