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111
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1 /* This file is part of the Intel(R) Cilk(TM) Plus support
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2 This file contains routines to handle Cilk Plus specific
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3 routines for the C++ Compiler.
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4 Copyright (C) 2013-2017 Free Software Foundation, Inc.
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5 Contributed by Aldy Hernandez <aldyh@redhat.com>.
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6
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7 This file is part of GCC.
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8
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9 GCC is free software; you can redistribute it and/or modify it
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10 under the terms of the GNU General Public License as published by
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11 the Free Software Foundation; either version 3, or (at your option)
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12 any later version.
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13
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14 GCC is distributed in the hope that it will be useful, but
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15 WITHOUT ANY WARRANTY; without even the implied warranty of
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16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 General Public License for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with GCC; see the file COPYING3. If not see
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21 <http://www.gnu.org/licenses/>. */
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22
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23 #include "config.h"
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24 #include "system.h"
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25 #include "coretypes.h"
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26 #include "cp-tree.h"
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27 #include "tree-iterator.h"
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28 #include "cilk.h"
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29 #include "c-family/c-common.h"
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30
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31 /* Return TRUE if T is a FUNCTION_DECL for a type-conversion operator. */
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32
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33 static bool
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34 is_conversion_operator_function_decl_p (tree t)
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35 {
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36 if (TREE_CODE (t) != FUNCTION_DECL)
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37 return false;
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38
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39 return DECL_CONV_FN_P (t);
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40 }
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41
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42 /* Recursively traverse EXP to search for a CILK_SPAWN_STMT subtree.
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43 Return the CILK_SPAWN_STMT subtree if found; otherwise, the last subtree
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44 searched. */
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45
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46 static tree
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47 find_spawn (tree exp)
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48 {
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49 /* Happens with C++ TARGET_EXPR. */
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50 if (exp == NULL_TREE)
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51 return exp;
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52
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53 if (cilk_ignorable_spawn_rhs_op (exp))
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54 return find_spawn (TREE_OPERAND (exp, 0));
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55
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56 switch (TREE_CODE (exp))
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57 {
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58 case AGGR_INIT_EXPR:
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59 {
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60 /* Check for initialization via a constructor call that represents
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61 implicit conversion. */
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62 if (AGGR_INIT_VIA_CTOR_P (exp) && aggr_init_expr_nargs (exp) == 2)
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63 return find_spawn (AGGR_INIT_EXPR_ARG (exp, 1));
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64
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65 /* Check for initialization via a call to a type-conversion
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66 operator. */
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67 tree fn = AGGR_INIT_EXPR_FN (exp);
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68 if (TREE_CODE (fn) == ADDR_EXPR
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69 && is_conversion_operator_function_decl_p (TREE_OPERAND (fn, 0))
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70 && aggr_init_expr_nargs (exp) == 1)
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71 return find_spawn (AGGR_INIT_EXPR_ARG (exp, 0));
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72 }
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73 break;
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74
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75 case CALL_EXPR:
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76 {
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77 /* Check for a call to a type-conversion operator. */
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78 tree fndecl = TREE_OPERAND (CALL_EXPR_FN (exp), 0);
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79 if (is_conversion_operator_function_decl_p (fndecl)
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80 && call_expr_nargs (exp) == 1)
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81 return find_spawn (CALL_EXPR_ARG (exp, 0));
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82 }
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83 break;
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84
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85 case TARGET_EXPR:
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86 return find_spawn (TARGET_EXPR_INITIAL (exp));
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87
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88 case CLEANUP_POINT_EXPR:
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89 case COMPOUND_EXPR:
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90 case EXPR_STMT:
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91 return find_spawn (TREE_OPERAND (exp, 0));
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92
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93 default:
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94 break;
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95 }
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96
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97 return exp;
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98 }
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99
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100 /* Return true if *EXP0 is a recognized form of spawn. Recognized forms
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101 are, after conversion to void, a call expression at outer level or an
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102 assignment at outer level with the right hand side being a spawned call.
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103 In addition to this, it also unwraps the CILK_SPAWN_STMT cover from the
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104 CALL_EXPR that is being spawned.
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105
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106 Note that `=' in C++ may turn into a CALL_EXPR rather than a
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107 MODIFY_EXPR. */
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108
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109 bool
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110 cilk_cp_detect_spawn_and_unwrap (tree *exp0)
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111 {
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112 tree exp = *exp0;
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113
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114 if (!TREE_SIDE_EFFECTS (exp))
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115 return false;
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116
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117 /* Strip off any conversion to void. It does not affect whether spawn
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118 is supported here. */
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119 if (TREE_CODE (exp) == CONVERT_EXPR && VOID_TYPE_P (TREE_TYPE (exp)))
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120 exp = TREE_OPERAND (exp, 0);
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121
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122 if (TREE_CODE (exp) == MODIFY_EXPR || TREE_CODE (exp) == INIT_EXPR)
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123 exp = TREE_OPERAND (exp, 1);
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124
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125 exp = find_spawn (exp);
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126 if (exp == NULL_TREE)
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127 return false;
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128
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129 /* Now we should have a CALL_EXPR with a CILK_SPAWN_STMT wrapper around
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130 it, or return false. */
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131 return cilk_recognize_spawn (exp, exp0);
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132 }
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133
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134 /* Callback for cp_walk_tree to validate the body of a pragma simd loop
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135 or _cilk_for loop.
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136
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137 This function is passed in as a function pointer to walk_tree. *TP is
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138 the current tree pointer, *WALK_SUBTREES is set to 0 by this function if
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139 recursing into TP's subtrees is unnecessary. *DATA is a bool variable that
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140 is set to false if an error has occurred. */
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141
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142 static tree
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143 cpp_validate_cilk_plus_loop_aux (tree *tp, int *walk_subtrees, void *data)
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144 {
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145 bool *valid = (bool *) data;
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146
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147 if (!tp || !*tp)
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148 return NULL_TREE;
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149
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150 location_t loc = EXPR_LOCATION (*tp);
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151 if (TREE_CODE (*tp) == THROW_EXPR)
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152 {
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153 error_at (loc, "throw expressions are not allowed inside loops "
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154 "marked with pragma simd");
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155 *walk_subtrees = 0;
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156 *valid = false;
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157 }
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158 else if (TREE_CODE (*tp) == TRY_BLOCK)
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159 {
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160 error_at (loc, "try statements are not allowed inside loops marked "
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161 "with #pragma simd");
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162 *valid = false;
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163 *walk_subtrees = 0;
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164 }
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165 return NULL_TREE;
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166 }
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167
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168
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169 /* Walks through all the subtrees of BODY using walk_tree to make sure
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170 invalid statements/expressions are not found inside BODY. Returns
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171 false if any invalid statements are found. */
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172
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173 bool
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174 cpp_validate_cilk_plus_loop (tree body)
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175 {
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176 bool valid = true;
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177 cp_walk_tree (&body, cpp_validate_cilk_plus_loop_aux,
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178 (void *) &valid, NULL);
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179 return valid;
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180 }
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181
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182 /* Sets the EXCEPTION bit (0x10) in the FRAME.flags field. */
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183
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184 static tree
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185 set_cilk_except_flag (tree frame)
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186 {
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187 tree flags = cilk_dot (frame, CILK_TI_FRAME_FLAGS, 0);
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188
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189 flags = build2 (MODIFY_EXPR, void_type_node, flags,
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190 build2 (BIT_IOR_EXPR, TREE_TYPE (flags), flags,
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191 build_int_cst (TREE_TYPE (flags),
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192 CILK_FRAME_EXCEPTING)));
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193 return flags;
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194 }
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195
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196 /* Sets the frame.EXCEPT_DATA field to the head of the exception pointer. */
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197
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198 static tree
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199 set_cilk_except_data (tree frame)
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200 {
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201 tree except_data = cilk_dot (frame, CILK_TI_FRAME_EXCEPTION, 0);
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202 tree uresume_fn = builtin_decl_implicit (BUILT_IN_EH_POINTER);
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203 tree ret_expr;
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204 uresume_fn = build_call_expr (uresume_fn, 1,
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205 build_int_cst (integer_type_node, 0));
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206 ret_expr = build2 (MODIFY_EXPR, void_type_node, except_data, uresume_fn);
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207 return ret_expr;
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208 }
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209
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210 /* Installs BODY into function FNDECL with appropriate exception handling
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211 code. WD holds information of wrapper function used to pass into the
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212 outlining function, cilk_outline. */
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213
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214 void
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215 cilk_install_body_with_frame_cleanup (tree fndecl, tree orig_body, void *wd)
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216 {
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217 tree frame = make_cilk_frame (fndecl);
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218 tree dtor = create_cilk_function_exit (frame, false, false);
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219 add_local_decl (cfun, frame);
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220
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221 cfun->language = ggc_cleared_alloc<language_function> ();
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222
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223 location_t loc = EXPR_LOCATION (orig_body);
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224 tree list = alloc_stmt_list ();
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225 DECL_SAVED_TREE (fndecl) = list;
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226 tree body = alloc_stmt_list ();
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227 cilk_outline (fndecl, &orig_body, (struct wrapper_data *) wd);
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228 append_to_statement_list (orig_body, &body);
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229 if (flag_exceptions)
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230 {
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231 tree except_flag = set_cilk_except_flag (frame);
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232 tree except_data = set_cilk_except_data (frame);
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233 tree catch_list = alloc_stmt_list ();
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234 append_to_statement_list (except_flag, &catch_list);
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235 append_to_statement_list (except_data, &catch_list);
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236 body = create_try_catch_expr (body, catch_list);
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237 }
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238 append_to_statement_list (build_stmt (loc, TRY_FINALLY_EXPR, body, dtor),
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239 &list);
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240 }
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