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Diffstat (limited to 'gcc/c-omp.c')
| -rw-r--r-- | gcc/c-omp.c | 429 |
1 files changed, 429 insertions, 0 deletions
diff --git a/gcc/c-omp.c b/gcc/c-omp.c new file mode 100644 index 00000000000..30e7e64b47b --- /dev/null +++ b/gcc/c-omp.c @@ -0,0 +1,429 @@ +/* This file contains routines to construct GNU OpenMP constructs, + called from parsing in the C and C++ front ends. + + Copyright (C) 2005 Free Software Foundation, Inc. + Contributed by Richard Henderson <rth@redhat.com>, + Diego Novillo <dnovillo@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 2, 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 COPYING. If not, write to the Free +Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301, USA. */ + +#include "config.h" +#include "system.h" +#include "coretypes.h" +#include "tm.h" +#include "tree.h" +#include "function.h" +#include "c-common.h" +#include "toplev.h" +#include "tree-gimple.h" +#include "bitmap.h" +#include "langhooks.h" + + +/* Complete a #pragma omp master construct. STMT is the structured-block + that follows the pragma. */ + +tree +c_finish_omp_master (tree stmt) +{ + return add_stmt (build1 (OMP_MASTER, void_type_node, stmt)); +} + +/* Complete a #pragma omp critical construct. STMT is the structured-block + that follows the pragma, NAME is the identifier in the pragma, or null + if it was omitted. */ + +tree +c_finish_omp_critical (tree body, tree name) +{ + tree stmt = make_node (OMP_CRITICAL); + TREE_TYPE (stmt) = void_type_node; + OMP_CRITICAL_BODY (stmt) = body; + OMP_CRITICAL_NAME (stmt) = name; + return add_stmt (stmt); +} + +/* Complete a #pragma omp ordered construct. STMT is the structured-block + that follows the pragma. */ + +tree +c_finish_omp_ordered (tree stmt) +{ + return add_stmt (build1 (OMP_ORDERED, void_type_node, stmt)); +} + + +/* Complete a #pragma omp barrier construct. */ + +void +c_finish_omp_barrier (void) +{ + tree x; + + x = built_in_decls[BUILT_IN_GOMP_BARRIER]; + x = build_function_call_expr (x, NULL); + add_stmt (x); +} + + +/* Complete a #pragma omp atomic construct. The expression to be + implemented atomically is LHS code= RHS. */ + +void +c_finish_omp_atomic (enum tree_code code, tree lhs, tree rhs) +{ + tree x, type, addr; + + if (lhs == error_mark_node || rhs == error_mark_node) + return; + + /* ??? According to one reading of the OpenMP spec, complex type are + supported, but there are no atomic stores for any architecture. + But at least icc 9.0 doesn't support complex types here either. + And lets not even talk about vector types... */ + type = TREE_TYPE (lhs); + if (!INTEGRAL_TYPE_P (type) + && !POINTER_TYPE_P (type) + && !SCALAR_FLOAT_TYPE_P (type)) + { + error ("invalid expression type for %<#pragma omp atomic%>"); + return; + } + + /* ??? Validate that rhs does not overlap lhs. */ + + /* Take and save the address of the lhs. From then on we'll reference it + via indirection. */ + addr = build_unary_op (ADDR_EXPR, lhs, 0); + if (addr == error_mark_node) + return; + addr = save_expr (addr); + lhs = build_indirect_ref (addr, NULL); + + /* There are lots of warnings, errors, and conversions that need to happen + in the course of interpreting a statement. Use the normal mechanisms + to do this, and then take it apart again. */ + x = build_modify_expr (lhs, code, rhs); + if (x == error_mark_node) + return; + gcc_assert (TREE_CODE (x) == MODIFY_EXPR); + rhs = TREE_OPERAND (x, 1); + + /* Punt the actual generation of atomic operations to common code. */ + add_stmt (build2 (OMP_ATOMIC, void_type_node, addr, rhs)); +} + + +/* Complete a #pragma omp flush construct. We don't do anything with the + variable list that the syntax allows. */ + +void +c_finish_omp_flush (void) +{ + tree x; + + x = built_in_decls[BUILT_IN_SYNCHRONIZE]; + x = build_function_call_expr (x, NULL); + add_stmt (x); +} + + +/* Check and canonicalize #pragma omp for increment expression. + Helper function for c_finish_omp_for. */ + +static tree +check_omp_for_incr_expr (tree exp, tree decl) +{ + tree t; + + if (!INTEGRAL_TYPE_P (TREE_TYPE (exp)) + || TYPE_PRECISION (TREE_TYPE (exp)) < TYPE_PRECISION (TREE_TYPE (decl))) + return error_mark_node; + + if (exp == decl) + return build_int_cst (TREE_TYPE (exp), 0); + + switch (TREE_CODE (exp)) + { + case NOP_EXPR: + t = check_omp_for_incr_expr (TREE_OPERAND (exp, 0), decl); + if (t != error_mark_node) + return fold_convert (TREE_TYPE (exp), t); + break; + case MINUS_EXPR: + t = check_omp_for_incr_expr (TREE_OPERAND (exp, 0), decl); + if (t != error_mark_node) + return fold_build2 (MINUS_EXPR, TREE_TYPE (exp), t, TREE_OPERAND (exp, 1)); + break; + case PLUS_EXPR: + t = check_omp_for_incr_expr (TREE_OPERAND (exp, 0), decl); + if (t != error_mark_node) + return fold_build2 (PLUS_EXPR, TREE_TYPE (exp), t, TREE_OPERAND (exp, 1)); + t = check_omp_for_incr_expr (TREE_OPERAND (exp, 1), decl); + if (t != error_mark_node) + return fold_build2 (PLUS_EXPR, TREE_TYPE (exp), TREE_OPERAND (exp, 0), t); + break; + default: + break; + } + + return error_mark_node; +} + +/* Validate and emit code for the OpenMP directive #pragma omp for. + INIT, COND, INCR, BODY and PRE_BODY are the five basic elements + of the loop (initialization expression, controlling predicate, increment + expression, body of the loop and statements to go before the loop). + DECL is the iteration variable. */ + +tree +c_finish_omp_for (location_t locus, tree decl, tree init, tree cond, + tree incr, tree body, tree pre_body) +{ + location_t elocus = locus; + bool fail = false; + + if (EXPR_HAS_LOCATION (init)) + elocus = EXPR_LOCATION (init); + + /* Validate the iteration variable. */ + if (!INTEGRAL_TYPE_P (TREE_TYPE (decl))) + { + error ("%Hinvalid type for iteration variable %qE", &elocus, decl); + fail = true; + } + if (TYPE_UNSIGNED (TREE_TYPE (decl))) + warning (0, "%Hiteration variable %qE is unsigned", &elocus, decl); + + /* In the case of "for (int i = 0...)", init will be a decl. It should + have a DECL_INITIAL that we can turn into an assignment. */ + if (init == decl) + { + elocus = DECL_SOURCE_LOCATION (decl); + + init = DECL_INITIAL (decl); + if (init == NULL) + { + error ("%H%qE is not initialized", &elocus, decl); + init = integer_zero_node; + fail = true; + } + + init = build_modify_expr (decl, NOP_EXPR, init); + SET_EXPR_LOCATION (init, elocus); + } + gcc_assert (TREE_CODE (init) == MODIFY_EXPR); + gcc_assert (TREE_OPERAND (init, 0) == decl); + + if (cond == NULL_TREE) + { + error ("%Hmissing controlling predicate", &elocus); + fail = true; + } + else + { + bool cond_ok = false; + + if (EXPR_HAS_LOCATION (cond)) + elocus = EXPR_LOCATION (cond); + + if (TREE_CODE (cond) == LT_EXPR + || TREE_CODE (cond) == LE_EXPR + || TREE_CODE (cond) == GT_EXPR + || TREE_CODE (cond) == GE_EXPR) + { + tree op0 = TREE_OPERAND (cond, 0); + tree op1 = TREE_OPERAND (cond, 1); + + /* 2.5.1. The comparison in the condition is computed in the type + of DECL, otherwise the behavior is undefined. + + For example: + long n; int i; + i < n; + + according to ISO will be evaluated as: + (long)i < n; + + We want to force: + i < (int)n; */ + if (TREE_CODE (op0) == NOP_EXPR + && decl == TREE_OPERAND (op0, 0)) + { + TREE_OPERAND (cond, 0) = TREE_OPERAND (op0, 0); + TREE_OPERAND (cond, 1) = fold_build1 (NOP_EXPR, TREE_TYPE (decl), + TREE_OPERAND (cond, 1)); + } + else if (TREE_CODE (op1) == NOP_EXPR + && decl == TREE_OPERAND (op1, 0)) + { + TREE_OPERAND (cond, 1) = TREE_OPERAND (op1, 0); + TREE_OPERAND (cond, 0) = fold_build1 (NOP_EXPR, TREE_TYPE (decl), + TREE_OPERAND (cond, 0)); + } + + if (decl == TREE_OPERAND (cond, 0)) + cond_ok = true; + else if (decl == TREE_OPERAND (cond, 1)) + { + TREE_SET_CODE (cond, swap_tree_comparison (TREE_CODE (cond))); + TREE_OPERAND (cond, 1) = TREE_OPERAND (cond, 0); + TREE_OPERAND (cond, 0) = decl; + cond_ok = true; + } + } + + if (!cond_ok) + { + error ("%Hinvalid controlling predicate", &elocus); + fail = true; + } + } + + if (incr == NULL_TREE) + { + error ("%Hmissing increment expression", &elocus); + fail = true; + } + else + { + bool incr_ok = false; + + if (EXPR_HAS_LOCATION (incr)) + elocus = EXPR_LOCATION (incr); + + /* Check all the valid increment expressions: v++, v--, ++v, --v, + v = v + incr, v = incr + v and v = v - incr. */ + switch (TREE_CODE (incr)) + { + case POSTINCREMENT_EXPR: + case PREINCREMENT_EXPR: + case POSTDECREMENT_EXPR: + case PREDECREMENT_EXPR: + incr_ok = (TREE_OPERAND (incr, 0) == decl); + break; + + case MODIFY_EXPR: + if (TREE_OPERAND (incr, 0) != decl) + break; + if (TREE_OPERAND (incr, 1) == decl) + break; + if (TREE_CODE (TREE_OPERAND (incr, 1)) == PLUS_EXPR + && (TREE_OPERAND (TREE_OPERAND (incr, 1), 0) == decl + || TREE_OPERAND (TREE_OPERAND (incr, 1), 1) == decl)) + incr_ok = true; + else if (TREE_CODE (TREE_OPERAND (incr, 1)) == MINUS_EXPR + && TREE_OPERAND (TREE_OPERAND (incr, 1), 0) == decl) + incr_ok = true; + else + { + tree t = check_omp_for_incr_expr (TREE_OPERAND (incr, 1), decl); + if (t != error_mark_node) + { + incr_ok = true; + t = build2 (PLUS_EXPR, TREE_TYPE (decl), decl, t); + incr = build2 (MODIFY_EXPR, void_type_node, decl, t); + } + } + break; + + default: + break; + } + if (!incr_ok) + { + error ("%Hinvalid increment expression", &elocus); + fail = true; + } + } + + if (fail) + return NULL; + else + { + tree t = make_node (OMP_FOR); + + TREE_TYPE (t) = void_type_node; + OMP_FOR_INIT (t) = init; + OMP_FOR_COND (t) = cond; + OMP_FOR_INCR (t) = incr; + OMP_FOR_BODY (t) = body; + OMP_FOR_PRE_BODY (t) = pre_body; + + SET_EXPR_LOCATION (t, locus); + return add_stmt (t); + } +} + + +/* Divide CLAUSES into two lists: those that apply to a parallel construct, + and those that apply to a work-sharing construct. Place the results in + *PAR_CLAUSES and *WS_CLAUSES respectively. In addition, add a nowait + clause to the work-sharing list. */ + +void +c_split_parallel_clauses (tree clauses, tree *par_clauses, tree *ws_clauses) +{ + tree next; + + *par_clauses = NULL; + *ws_clauses = make_node (OMP_CLAUSE_NOWAIT); + + for (; clauses ; clauses = next) + { + next = OMP_CLAUSE_CHAIN (clauses); + + switch (TREE_CODE (clauses)) + { + case OMP_CLAUSE_PRIVATE: + case OMP_CLAUSE_SHARED: + case OMP_CLAUSE_FIRSTPRIVATE: + case OMP_CLAUSE_LASTPRIVATE: + case OMP_CLAUSE_REDUCTION: + case OMP_CLAUSE_COPYIN: + case OMP_CLAUSE_IF: + case OMP_CLAUSE_NUM_THREADS: + case OMP_CLAUSE_DEFAULT: + OMP_CLAUSE_CHAIN (clauses) = *par_clauses; + *par_clauses = clauses; + break; + + case OMP_CLAUSE_SCHEDULE: + case OMP_CLAUSE_ORDERED: + OMP_CLAUSE_CHAIN (clauses) = *ws_clauses; + *ws_clauses = clauses; + break; + + default: + gcc_unreachable (); + } + } +} + +/* True if OpenMP sharing attribute of DECL is predetermined. */ + +enum omp_clause_default_kind +c_omp_predetermined_sharing (tree decl) +{ + /* Variables with const-qualified type having no mutable member + are predetermined shared. */ + if (TREE_READONLY (decl)) + return OMP_CLAUSE_DEFAULT_SHARED; + + return OMP_CLAUSE_DEFAULT_UNSPECIFIED; +} |