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/* context.h - Holder for global state
Copyright (C) 2013 Free Software Foundation, Inc.
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_CONTEXT_H
#define GCC_CONTEXT_H
namespace gcc {
class pass_manager;
/* GCC's internal state can be divided into zero or more
"parallel universe" of state; an instance of this class is one such
context of state. */
class GTY((user)) context
{
public:
/* Ensure that instances are allocated within the GC-heap. */
void *operator new (std::size_t size);
context();
/* Garbage-collector integration.
Each context assumes it has full control of the GC-heap that it
is associated with. It acts as a root for that GC-heap, owning
references to within it.
Note that context instances are allocated within their own GC
heap.
The methods are called the *first time* that the context is reached
during a ggc/pch traversal, rather than every time. */
void gt_ggc_mx ();
void gt_pch_nx ();
void gt_pch_nx (gt_pointer_operator op, void *cookie);
/* Pass-management. */
pass_manager *get_passes () { gcc_assert (passes_); return passes_; }
private:
/* Pass-management. */
pass_manager *passes_;
}; // class context
} // namespace gcc
/* The global singleton context aka "g".
(the name is chosen to be easy to type in a debugger). */
extern GTY(()) gcc::context *g;
/* Global hooks for ggc/pch.
The gcc::context class is marked with GTY((user)), which leads to
gengtype creating autogenerated functions for handling context within
gtype-desc.c:
void gt_ggc_mx_context (void *x_p);
void gt_pch_nx_context (void *x_p)
void gt_pch_p_7context (void *this_obj,
void *x_p,
gt_pointer_operator op,
void *cookie);
Those functions call the following global functions the first time
that the context is reached during a traversal, and the following
global functions in turn simply call the corresponding methods of the
context (so that they can access private fields of the context). */
inline void
gt_ggc_mx (gcc::context *ctxt)
{
ctxt->gt_ggc_mx ();
}
inline void
gt_pch_nx (gcc::context *ctxt)
{
ctxt->gt_pch_nx ();
}
inline void
gt_pch_nx (gcc::context *ctxt, gt_pointer_operator op, void *cookie)
{
ctxt->gt_pch_nx (op, cookie);
}
#endif /* ! GCC_CONTEXT_H */
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