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/* Paths through the code associated with a diagnostic.
Copyright (C) 2019-2020 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/>. */
#ifndef GCC_DIAGNOSTIC_PATH_H
#define GCC_DIAGNOSTIC_PATH_H
#include "diagnostic.h" /* for ATTRIBUTE_GCC_DIAG. */
#include "diagnostic-event-id.h"
/* A diagnostic_path is an optional additional piece of metadata associated
with a diagnostic (via its rich_location).
It describes a sequence of events predicted by the compiler that
lead to the problem occurring, with their locations in the user's source,
and text descriptions.
For example, the following error has a 3-event path:
test.c: In function 'demo':
test.c:29:5: error: passing NULL as argument 1 to 'PyList_Append' which
requires a non-NULL parameter
29 | PyList_Append(list, item);
| ^~~~~~~~~~~~~~~~~~~~~~~~~
'demo': events 1-3
|
| 25 | list = PyList_New(0);
| | ^~~~~~~~~~~~~
| | |
| | (1) when 'PyList_New' fails, returning NULL
| 26 |
| 27 | for (i = 0; i < count; i++) {
| | ~~~
| | |
| | (2) when 'i < count'
| 28 | item = PyLong_FromLong(random());
| 29 | PyList_Append(list, item);
| | ~~~~~~~~~~~~~~~~~~~~~~~~~
| | |
| | (3) when calling 'PyList_Append', passing NULL from (1) as argument 1
|
The diagnostic-printing code has consolidated the path into a single
run of events, since all the events are near each other and within the same
function; more complicated examples (such as interprocedural paths)
might be printed as multiple runs of events. */
/* Abstract base classes, describing events within a path, and the paths
themselves. */
/* One event within a diagnostic_path. */
class diagnostic_event
{
public:
virtual ~diagnostic_event () {}
virtual location_t get_location () const = 0;
virtual tree get_fndecl () const = 0;
/* Stack depth, so that consumers can visualizes the interprocedural
calls, returns, and frame nesting. */
virtual int get_stack_depth () const = 0;
/* Get a localized (and possibly colorized) description of this event. */
virtual label_text get_desc (bool can_colorize) const = 0;
};
/* Abstract base class for getting at a sequence of events. */
class diagnostic_path
{
public:
virtual ~diagnostic_path () {}
virtual unsigned num_events () const = 0;
virtual const diagnostic_event & get_event (int idx) const = 0;
bool interprocedural_p () const;
};
/* Concrete subclasses. */
/* A simple implementation of diagnostic_event. */
class simple_diagnostic_event : public diagnostic_event
{
public:
simple_diagnostic_event (location_t loc, tree fndecl, int depth,
const char *desc);
~simple_diagnostic_event ();
location_t get_location () const FINAL OVERRIDE { return m_loc; }
tree get_fndecl () const FINAL OVERRIDE { return m_fndecl; }
int get_stack_depth () const FINAL OVERRIDE { return m_depth; }
label_text get_desc (bool) const FINAL OVERRIDE
{
return label_text::borrow (m_desc);
}
private:
location_t m_loc;
tree m_fndecl;
int m_depth;
char *m_desc; // has been i18n-ed and formatted
};
/* A simple implementation of diagnostic_path, as a vector of
simple_diagnostic_event instances. */
class simple_diagnostic_path : public diagnostic_path
{
public:
simple_diagnostic_path (pretty_printer *event_pp)
: m_event_pp (event_pp) {}
unsigned num_events () const FINAL OVERRIDE;
const diagnostic_event & get_event (int idx) const FINAL OVERRIDE;
diagnostic_event_id_t add_event (location_t loc, tree fndecl, int depth,
const char *fmt, ...)
ATTRIBUTE_GCC_DIAG(5,6);
private:
auto_delete_vec<simple_diagnostic_event> m_events;
/* (for use by add_event). */
pretty_printer *m_event_pp;
};
extern void debug (diagnostic_path *path);
#endif /* ! GCC_DIAGNOSTIC_PATH_H */
|
