Collaboration diagram for omp_region:

Data Fields
struct omp_region *	outer
struct omp_region *	inner
struct omp_region *	next
basic_block	entry
basic_block	exit
basic_block	cont
vec< tree, va_gc > *	ws_args
enum gimple_code	type
enum omp_clause_schedule_kind	sched_kind
bool	is_combined_parallel

Detailed Description

Lowering pass for OpenMP directives. Converts OpenMP directives into explicit calls to the runtime library (libgomp) and data marshalling to implement data sharing and copying clauses. Contributed by Diego Novillo dnovi.nosp@m.llo@.nosp@m.redha.nosp@m.t.co.nosp@m.m

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/. Lowering of OpenMP parallel and workshare constructs proceeds in two phases. The first phase scans the function looking for OMP statements and then for variables that must be replaced to satisfy data sharing clauses. The second phase expands code for the constructs, as well as re-gimplifying things when variables have been replaced with complex expressions.

Final code generation is done by pass_expand_omp. The flowgraph is scanned for parallel regions which are then moved to a new function, to be invoked by the thread library. Parallel region information. Every parallel and workshare directive is enclosed between two markers, the OMP_* directive and a corresponding OMP_RETURN statement.