include/pet.h

   1 #ifndef PET_H
   2 #define PET_H
   3
   4 #include <isl/aff.h>
   5 #include <isl/arg.h>
   6 #include <isl/ast_build.h>
   7 #include <isl/set.h>
   8 #include <isl/map.h>
   9 #include <isl/union_map.h>
  10 #include <isl/printer.h>
  11 #include <isl/id_to_ast_expr.h>
  12
  13 #if defined(__cplusplus)
  14 extern "C" {
  15 #endif
  16
  17 struct pet_options;
  18 ISL_ARG_DECL(pet_options, struct pet_options, pet_options_args)
  19
  20 /* If autodetect is set, any valid scop is extracted.
  21  * Otherwise, the scop needs to be delimited by pragmas.
  22  */
  23 int pet_options_set_autodetect(isl_ctx *ctx, int val);
  24 int pet_options_get_autodetect(isl_ctx *ctx);
  25
  26 #define PET_OVERFLOW_AVOID      0
  27 #define PET_OVERFLOW_IGNORE     1
  28 int pet_options_set_signed_overflow(isl_ctx *ctx, int val);
  29 int pet_options_get_signed_overflow(isl_ctx *ctx);
  30
  31 enum pet_expr_type {
  32         pet_expr_access,
  33         pet_expr_call,
  34         pet_expr_cast,
  35         pet_expr_double,
  36         pet_expr_unary,
  37         pet_expr_binary,
  38         pet_expr_ternary
  39 };
  40
  41 enum pet_op_type {
  42         /* only compound assignments operators before assignment */
  43         pet_op_add_assign,
  44         pet_op_sub_assign,
  45         pet_op_mul_assign,
  46         pet_op_div_assign,
  47         pet_op_assign,
  48         pet_op_add,
  49         pet_op_sub,
  50         pet_op_mul,
  51         pet_op_div,
  52         pet_op_mod,
  53         pet_op_eq,
  54         pet_op_le,
  55         pet_op_lt,
  56         pet_op_gt,
  57         pet_op_minus,
  58         pet_op_post_inc,
  59         pet_op_post_dec,
  60         pet_op_pre_inc,
  61         pet_op_pre_dec,
  62         pet_op_address_of,
  63         pet_op_kill,
  64         pet_op_last
  65 };
  66
  67 /* Index into the pet_expr->args array when pet_expr->type == pet_expr_unary
  68  */
  69 enum pet_un_arg_type {
  70         pet_un_arg
  71 };
  72
  73 /* Indices into the pet_expr->args array when
  74  * pet_expr->type == pet_expr_binary
  75  */
  76 enum pet_bin_arg_type {
  77         pet_bin_lhs,
  78         pet_bin_rhs
  79 };
  80
  81 /* Indices into the pet_expr->args array when
  82  * pet_expr->type == pet_expr_ternary
  83  */
  84 enum pet_ter_arg_type {
  85         pet_ter_cond,
  86         pet_ter_true,
  87         pet_ter_false
  88 };
  89
  90 /* d is valid when type == pet_expr_double
  91  * acc is valid when type == pet_expr_access
  92  * name is valid when type == pet_expr_call
  93  * type is valid when type == pet_expr_cast
  94  * op is valid otherwise
  95  *
  96  * For each access expression inside the body of a statement, acc.ref_id
  97  * is a unique reference identifier.
  98  * acc.index represents the index expression, while acc.access
  99  * represents the corresponding access relation.
 100  * The output dimension of the index expression may be smaller
 101  * than the number of dimensions of the accessed array.
 102  * The target space of the access relation, on the other hand,
 103  * is equal to the array space.
 104  * Both acc.index and acc.access usually map an iteration space
 105  * to a (partial) data space.
 106  * If the access has arguments, however, then the domain of the
 107  * mapping is a wrapped mapping from the iteration space
 108  * to a space of dimensionality equal to the number of arguments.
 109  * Each dimension in this space corresponds to the value of the
 110  * corresponding argument.
 111  *
 112  * If the data space is unnamed (and 1D), then it represents
 113  * the set of integers.  That is, the access represents a value that
 114  * is equal to the index.
 115  *
 116  * A double is represented as both an (approximate) value "val" and
 117  * a string representation "s".
 118  */
 119 struct pet_expr {
 120         enum pet_expr_type type;
 121
 122         unsigned n_arg;
 123         struct pet_expr **args;
 124
 125         union {
 126                 struct {
 127                         isl_id *ref_id;
 128                         isl_map *access;
 129                         isl_multi_pw_aff *index;
 130                         int read;
 131                         int write;
 132                 } acc;
 133                 enum pet_op_type op;
 134                 char *name;
 135                 char *type_name;
 136                 struct {
 137                         double val;
 138                         char *s;
 139                 } d;
 140         };
 141 };
 142
 143 /* If the statement has arguments, i.e., n_arg != 0, then
 144  * "domain" is a wrapped map, mapping the iteration domain
 145  * to the values of the arguments for which this statement
 146  * is executed.
 147  * Otherwise, it is simply the iteration domain.
 148  *
 149  * If one of the arguments is an access expression that accesses
 150  * more than one element for a given iteration, then the constraints
 151  * on the value of this argument (encoded in "domain") should be satisfied
 152  * for all of those accessed elements.
 153  */
 154 struct pet_stmt {
 155         int line;
 156         isl_set *domain;
 157         isl_map *schedule;
 158         struct pet_expr *body;
 159
 160         unsigned n_arg;
 161         struct pet_expr **args;
 162 };
 163
 164 /* Construct an associative array from reference identifiers of
 165  * access expressions in "stmt" to the corresponding isl_ast_expr.
 166  * Each index expression is first transformed through "fn_index"
 167  * (if not NULL).  Then an AST expression is generated using "build".
 168  * Finally, the AST expression is transformed using "fn_expr"
 169  * (if not NULL).
 170  */
 171 __isl_give isl_id_to_ast_expr *pet_stmt_build_ast_exprs(struct pet_stmt *stmt,
 172         __isl_keep isl_ast_build *build,
 173         __isl_give isl_multi_pw_aff *(*fn_index)(
 174                 __isl_take isl_multi_pw_aff *mpa, __isl_keep isl_id *id,
 175                 void *user), void *user_index,
 176         __isl_give isl_ast_expr *(*fn_expr)(__isl_take isl_ast_expr *expr,
 177                 __isl_keep isl_id *id, void *user), void *user_expr);
 178
 179 /* Print "stmt" to "p".
 180  *
 181  * The access expressions in "stmt" are replaced by the isl_ast_expr
 182  * associated to its reference identifier in "ref2expr".
 183  */
 184 __isl_give isl_printer *pet_stmt_print_body(struct pet_stmt *stmt,
 185         __isl_take isl_printer *p, __isl_keep isl_id_to_ast_expr *ref2expr);
 186
 187 /* context holds constraints on the parameter that ensure that
 188  * this array has a valid (i.e., non-negative) size
 189  *
 190  * extent holds constraints on the indices
 191  *
 192  * value_bounds holds constraints on the elements of the array
 193  * and may be NULL if no such constraints were specified by the user
 194  *
 195  * element_size is the size in bytes of each array element
 196  *
 197  * live_out is set if the array appears in a live-out pragma
 198  *
 199  * if uniquely_defined is set then the array is written by a single access
 200  * such that any element that is ever read
 201  * is known to be assigned exactly once before the read
 202  *
 203  * declared is set if the array was declared somewhere inside the scop.
 204  * exposed is set if the declared array is visible outside the scop.
 205  */
 206 struct pet_array {
 207         isl_set *context;
 208         isl_set *extent;
 209         isl_set *value_bounds;
 210         char *element_type;
 211         int element_size;
 212         int live_out;
 213         int uniquely_defined;
 214         int declared;
 215         int exposed;
 216 };
 217
 218 /* This structure represents an implication on a boolean filter.
 219  * In particular, if the filter value of an element in the domain
 220  * of "extension" is equal to "satisfied", then the filter values
 221  * of the corresponding images in "extension" are also equal
 222  * to "satisfied".
 223  */
 224 struct pet_implication {
 225         int satisfied;
 226         isl_map *extension;
 227 };
 228
 229 /* The start and end fields contain the offsets in the input file
 230  * of the scop, where end points to the first character after the scop.
 231  * If the scop was detected based on scop and endscop pragmas, then
 232  * the lines containing these pragmas are included in this range.
 233  * Internally, end may be zero to indicate that no offset information is
 234  * available (yet).
 235  * The context describes the set of parameter values for which
 236  * the scop can be executed.
 237  * context_value describes assignments to the parameters (if any)
 238  * outside of the scop.
 239  *
 240  * The n_implication implications describe implications on boolean filters.
 241  */
 242 struct pet_scop {
 243         unsigned start;
 244         unsigned end;
 245
 246         isl_set *context;
 247         isl_set *context_value;
 248
 249         int n_array;
 250         struct pet_array **arrays;
 251
 252         int n_stmt;
 253         struct pet_stmt **stmts;
 254
 255         int n_implication;
 256         struct pet_implication **implications;
 257 };
 258
 259 /* Return a textual representation of the operator. */
 260 const char *pet_op_str(enum pet_op_type op);
 261 int pet_op_is_inc_dec(enum pet_op_type op);
 262
 263 /* Extract a pet_scop from a C source file.
 264  * If function is not NULL, then the pet_scop is extracted from
 265  * a function with that name.
 266  */
 267 struct pet_scop *pet_scop_extract_from_C_source(isl_ctx *ctx,
 268         const char *filename, const char *function);
 269
 270 /* Transform the C source file "input" by rewriting each scop
 271  * When autodetecting scops, at most one scop per function is rewritten.
 272  * The transformed C code is written to "output".
 273  */
 274 int pet_transform_C_source(isl_ctx *ctx, const char *input, FILE *output,
 275         __isl_give isl_printer *(*transform)(__isl_take isl_printer *p,
 276                 struct pet_scop *scop, void *user), void *user);
 277 /* Given a scop and a printer passed to a pet_transform_C_source callback,
 278  * print the original corresponding code to the printer.
 279  */
 280 __isl_give isl_printer *pet_scop_print_original(struct pet_scop *scop,
 281         __isl_take isl_printer *p);
 282
 283 /* Update all isl_sets and isl_maps such that they all have the same
 284  * parameters in the same order.
 285  */
 286 struct pet_scop *pet_scop_align_params(struct pet_scop *scop);
 287
 288 /* Does "scop" contain any data dependent accesses? */
 289 int pet_scop_has_data_dependent_accesses(struct pet_scop *scop);
 290 /* Does "scop" contain any data dependent conditions? */
 291 int pet_scop_has_data_dependent_conditions(struct pet_scop *scop);
 292
 293 void pet_scop_dump(struct pet_scop *scop);
 294 struct pet_scop *pet_scop_free(struct pet_scop *scop);
 295
 296 __isl_give isl_union_set *pet_scop_collect_domains(struct pet_scop *scop);
 297 /* Collect all potential read access relations. */
 298 __isl_give isl_union_map *pet_scop_collect_may_reads(struct pet_scop *scop);
 299 /* Collect all potential write access relations. */
 300 __isl_give isl_union_map *pet_scop_collect_may_writes(struct pet_scop *scop);
 301 /* Collect all definite write access relations. */
 302 __isl_give isl_union_map *pet_scop_collect_must_writes(struct pet_scop *scop);
 303 __isl_give isl_union_map *pet_scop_collect_schedule(struct pet_scop *scop);
 304
 305 #if defined(__cplusplus)
 306 }
 307 #endif
 308
 309 #endif