src/compiler/glsl/ast.h

   1 /* -*- c++ -*- */
   2 /*
   3  * Copyright © 2009 Intel Corporation
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 #pragma once
  26 #ifndef AST_H
  27 #define AST_H
  28
  29 #include "list.h"
  30 #include "glsl_parser_extras.h"
  31
  32 struct _mesa_glsl_parse_state;
  33
  34 struct YYLTYPE;
  35
  36 /**
  37  * \defgroup AST Abstract syntax tree node definitions
  38  *
  39  * An abstract syntax tree is generated by the parser.  This is a fairly
  40  * direct representation of the gramma derivation for the source program.
  41  * No symantic checking is done during the generation of the AST.  Only
  42  * syntactic checking is done.  Symantic checking is performed by a later
  43  * stage that converts the AST to a more generic intermediate representation.
  44  *
  45  *@{
  46  */
  47 /**
  48  * Base class of all abstract syntax tree nodes
  49  */
  50 class ast_node {
  51 public:
  52    DECLARE_RALLOC_CXX_OPERATORS(ast_node);
  53
  54    /**
  55     * Print an AST node in something approximating the original GLSL code
  56     */
  57    virtual void print(void) const;
  58
  59    /**
  60     * Convert the AST node to the high-level intermediate representation
  61     */
  62    virtual ir_rvalue *hir(exec_list *instructions,
  63                           struct _mesa_glsl_parse_state *state);
  64
  65    virtual bool has_sequence_subexpression() const;
  66
  67    /**
  68     * Retrieve the source location of an AST node
  69     *
  70     * This function is primarily used to get the source position of an AST node
  71     * into a form that can be passed to \c _mesa_glsl_error.
  72     *
  73     * \sa _mesa_glsl_error, ast_node::set_location
  74     */
  75    struct YYLTYPE get_location(void) const
  76    {
  77       struct YYLTYPE locp;
  78
  79       locp.source = this->location.source;
  80       locp.first_line = this->location.first_line;
  81       locp.first_column = this->location.first_column;
  82       locp.last_line = this->location.last_line;
  83       locp.last_column = this->location.last_column;
  84
  85       return locp;
  86    }
  87
  88    /**
  89     * Set the source location of an AST node from a parser location
  90     *
  91     * \sa ast_node::get_location
  92     */
  93    void set_location(const struct YYLTYPE &locp)
  94    {
  95       this->location.source = locp.source;
  96       this->location.first_line = locp.first_line;
  97       this->location.first_column = locp.first_column;
  98       this->location.last_line = locp.last_line;
  99       this->location.last_column = locp.last_column;
 100    }
 101
 102    /**
 103     * Set the source location range of an AST node using two location nodes
 104     *
 105     * \sa ast_node::set_location
 106     */
 107    void set_location_range(const struct YYLTYPE &begin, const struct YYLTYPE &end)
 108    {
 109       this->location.source = begin.source;
 110       this->location.first_line = begin.first_line;
 111       this->location.last_line = end.last_line;
 112       this->location.first_column = begin.first_column;
 113       this->location.last_column = end.last_column;
 114    }
 115
 116    /**
 117     * Source location of the AST node.
 118     */
 119    struct {
 120       unsigned source;          /**< GLSL source number. */
 121       unsigned first_line;      /**< First line number within the source string. */
 122       unsigned first_column;    /**< First column in the first line. */
 123       unsigned last_line;       /**< Last line number within the source string. */
 124       unsigned last_column;     /**< Last column in the last line. */
 125    } location;
 126
 127    exec_node link;
 128
 129 protected:
 130    /**
 131     * The only constructor is protected so that only derived class objects can
 132     * be created.
 133     */
 134    ast_node(void);
 135 };
 136
 137
 138 /**
 139  * Operators for AST expression nodes.
 140  */
 141 enum ast_operators {
 142    ast_assign,
 143    ast_plus,        /**< Unary + operator. */
 144    ast_neg,
 145    ast_add,
 146    ast_sub,
 147    ast_mul,
 148    ast_div,
 149    ast_mod,
 150    ast_lshift,
 151    ast_rshift,
 152    ast_less,
 153    ast_greater,
 154    ast_lequal,
 155    ast_gequal,
 156    ast_equal,
 157    ast_nequal,
 158    ast_bit_and,
 159    ast_bit_xor,
 160    ast_bit_or,
 161    ast_bit_not,
 162    ast_logic_and,
 163    ast_logic_xor,
 164    ast_logic_or,
 165    ast_logic_not,
 166
 167    ast_mul_assign,
 168    ast_div_assign,
 169    ast_mod_assign,
 170    ast_add_assign,
 171    ast_sub_assign,
 172    ast_ls_assign,
 173    ast_rs_assign,
 174    ast_and_assign,
 175    ast_xor_assign,
 176    ast_or_assign,
 177
 178    ast_conditional,
 179
 180    ast_pre_inc,
 181    ast_pre_dec,
 182    ast_post_inc,
 183    ast_post_dec,
 184    ast_field_selection,
 185    ast_array_index,
 186    ast_unsized_array_dim,
 187
 188    ast_function_call,
 189
 190    ast_identifier,
 191    ast_int_constant,
 192    ast_uint_constant,
 193    ast_float_constant,
 194    ast_bool_constant,
 195    ast_double_constant,
 196
 197    ast_sequence,
 198    ast_aggregate
 199 };
 200
 201 /**
 202  * Representation of any sort of expression.
 203  */
 204 class ast_expression : public ast_node {
 205 public:
 206    ast_expression(int oper, ast_expression *,
 207                   ast_expression *, ast_expression *);
 208
 209    ast_expression(const char *identifier) :
 210       oper(ast_identifier)
 211    {
 212       subexpressions[0] = NULL;
 213       subexpressions[1] = NULL;
 214       subexpressions[2] = NULL;
 215       primary_expression.identifier = identifier;
 216       this->non_lvalue_description = NULL;
 217    }
 218
 219    static const char *operator_string(enum ast_operators op);
 220
 221    virtual ir_rvalue *hir(exec_list *instructions,
 222                           struct _mesa_glsl_parse_state *state);
 223
 224    virtual void hir_no_rvalue(exec_list *instructions,
 225                               struct _mesa_glsl_parse_state *state);
 226
 227    virtual bool has_sequence_subexpression() const;
 228
 229    ir_rvalue *do_hir(exec_list *instructions,
 230                      struct _mesa_glsl_parse_state *state,
 231                      bool needs_rvalue);
 232
 233    virtual void print(void) const;
 234
 235    enum ast_operators oper;
 236
 237    ast_expression *subexpressions[3];
 238
 239    union {
 240       const char *identifier;
 241       int int_constant;
 242       float float_constant;
 243       unsigned uint_constant;
 244       int bool_constant;
 245       double double_constant;
 246    } primary_expression;
 247
 248
 249    /**
 250     * List of expressions for an \c ast_sequence or parameters for an
 251     * \c ast_function_call
 252     */
 253    exec_list expressions;
 254
 255    /**
 256     * For things that can't be l-values, this describes what it is.
 257     *
 258     * This text is used by the code that generates IR for assignments to
 259     * detect and emit useful messages for assignments to some things that
 260     * can't be l-values.  For example, pre- or post-incerement expressions.
 261     *
 262     * \note
 263     * This pointer may be \c NULL.
 264     */
 265    const char *non_lvalue_description;
 266 };
 267
 268 class ast_expression_bin : public ast_expression {
 269 public:
 270    ast_expression_bin(int oper, ast_expression *, ast_expression *);
 271
 272    virtual void print(void) const;
 273 };
 274
 275 /**
 276  * Subclass of expressions for function calls
 277  */
 278 class ast_function_expression : public ast_expression {
 279 public:
 280    ast_function_expression(ast_expression *callee)
 281       : ast_expression(ast_function_call, callee,
 282                        NULL, NULL),
 283         cons(false)
 284    {
 285       /* empty */
 286    }
 287
 288    ast_function_expression(class ast_type_specifier *type)
 289       : ast_expression(ast_function_call, (ast_expression *) type,
 290                        NULL, NULL),
 291         cons(true)
 292    {
 293       /* empty */
 294    }
 295
 296    bool is_constructor() const
 297    {
 298       return cons;
 299    }
 300
 301    virtual ir_rvalue *hir(exec_list *instructions,
 302                           struct _mesa_glsl_parse_state *state);
 303
 304    virtual void hir_no_rvalue(exec_list *instructions,
 305                               struct _mesa_glsl_parse_state *state);
 306
 307    virtual bool has_sequence_subexpression() const;
 308
 309 private:
 310    /**
 311     * Is this function call actually a constructor?
 312     */
 313    bool cons;
 314    ir_rvalue *
 315    handle_method(exec_list *instructions,
 316                  struct _mesa_glsl_parse_state *state);
 317 };
 318
 319 class ast_subroutine_list : public ast_node
 320 {
 321 public:
 322    virtual void print(void) const;
 323    exec_list declarations;
 324 };
 325
 326 class ast_array_specifier : public ast_node {
 327 public:
 328    ast_array_specifier(const struct YYLTYPE &locp, ast_expression *dim)
 329    {
 330       set_location(locp);
 331       array_dimensions.push_tail(&dim->link);
 332    }
 333
 334    void add_dimension(ast_expression *dim)
 335    {
 336       array_dimensions.push_tail(&dim->link);
 337    }
 338
 339    bool is_single_dimension() const
 340    {
 341       return this->array_dimensions.tail_pred->prev != NULL &&
 342              this->array_dimensions.tail_pred->prev->is_head_sentinel();
 343    }
 344
 345    virtual void print(void) const;
 346
 347    /* This list contains objects of type ast_node containing the
 348     * array dimensions in outermost-to-innermost order.
 349     */
 350    exec_list array_dimensions;
 351 };
 352
 353 class ast_layout_expression : public ast_node {
 354 public:
 355    ast_layout_expression(const struct YYLTYPE &locp, ast_expression *expr)
 356    {
 357       set_location(locp);
 358       layout_const_expressions.push_tail(&expr->link);
 359    }
 360
 361    bool process_qualifier_constant(struct _mesa_glsl_parse_state *state,
 362                                    const char *qual_indentifier,
 363                                    unsigned *value, bool can_be_zero);
 364
 365    void merge_qualifier(ast_layout_expression *l_expr)
 366    {
 367       layout_const_expressions.append_list(&l_expr->layout_const_expressions);
 368    }
 369
 370    exec_list layout_const_expressions;
 371 };
 372
 373 /**
 374  * C-style aggregate initialization class
 375  *
 376  * Represents C-style initializers of vectors, matrices, arrays, and
 377  * structures. E.g., vec3 pos = {1.0, 0.0, -1.0} is equivalent to
 378  * vec3 pos = vec3(1.0, 0.0, -1.0).
 379  *
 380  * Specified in GLSL 4.20 and GL_ARB_shading_language_420pack.
 381  *
 382  * \sa _mesa_ast_set_aggregate_type
 383  */
 384 class ast_aggregate_initializer : public ast_expression {
 385 public:
 386    ast_aggregate_initializer()
 387       : ast_expression(ast_aggregate, NULL, NULL, NULL),
 388         constructor_type(NULL)
 389    {
 390       /* empty */
 391    }
 392
 393    /**
 394     * glsl_type of the aggregate, which is inferred from the LHS of whatever
 395     * the aggregate is being used to initialize.  This can't be inferred at
 396     * parse time (since the parser deals with ast_type_specifiers, not
 397     * glsl_types), so the parser leaves it NULL.  However, the ast-to-hir
 398     * conversion code makes sure to fill it in with the appropriate type
 399     * before hir() is called.
 400     */
 401    const glsl_type *constructor_type;
 402
 403    virtual ir_rvalue *hir(exec_list *instructions,
 404                           struct _mesa_glsl_parse_state *state);
 405
 406    virtual void hir_no_rvalue(exec_list *instructions,
 407                               struct _mesa_glsl_parse_state *state);
 408 };
 409
 410 /**
 411  * Number of possible operators for an ast_expression
 412  *
 413  * This is done as a define instead of as an additional value in the enum so
 414  * that the compiler won't generate spurious messages like "warning:
 415  * enumeration value ‘ast_num_operators’ not handled in switch"
 416  */
 417 #define AST_NUM_OPERATORS (ast_sequence + 1)
 418
 419
 420 class ast_compound_statement : public ast_node {
 421 public:
 422    ast_compound_statement(int new_scope, ast_node *statements);
 423    virtual void print(void) const;
 424
 425    virtual ir_rvalue *hir(exec_list *instructions,
 426                           struct _mesa_glsl_parse_state *state);
 427
 428    int new_scope;
 429    exec_list statements;
 430 };
 431
 432 class ast_declaration : public ast_node {
 433 public:
 434    ast_declaration(const char *identifier,
 435                    ast_array_specifier *array_specifier,
 436                    ast_expression *initializer);
 437    virtual void print(void) const;
 438
 439    const char *identifier;
 440
 441    ast_array_specifier *array_specifier;
 442
 443    ast_expression *initializer;
 444 };
 445
 446
 447 enum {
 448    ast_precision_none = 0, /**< Absence of precision qualifier. */
 449    ast_precision_high,
 450    ast_precision_medium,
 451    ast_precision_low
 452 };
 453
 454 struct ast_type_qualifier {
 455    DECLARE_RALLOC_CXX_OPERATORS(ast_type_qualifier);
 456
 457    union {
 458       struct {
 459          unsigned invariant:1;
 460          unsigned precise:1;
 461          unsigned constant:1;
 462          unsigned attribute:1;
 463          unsigned varying:1;
 464          unsigned in:1;
 465          unsigned out:1;
 466          unsigned centroid:1;
 467          unsigned sample:1;
 468          unsigned patch:1;
 469          unsigned uniform:1;
 470          unsigned buffer:1;
 471          unsigned shared_storage:1;
 472          unsigned smooth:1;
 473          unsigned flat:1;
 474          unsigned noperspective:1;
 475
 476          /** \name Layout qualifiers for GL_ARB_fragment_coord_conventions */
 477          /*@{*/
 478          unsigned origin_upper_left:1;
 479          unsigned pixel_center_integer:1;
 480          /*@}*/
 481
 482          /**
 483           * Flag set if GL_ARB_explicit_attrib_location "location" layout
 484           * qualifier is used.
 485           */
 486          unsigned explicit_location:1;
 487          /**
 488           * Flag set if GL_ARB_explicit_attrib_location "index" layout
 489           * qualifier is used.
 490           */
 491          unsigned explicit_index:1;
 492
 493          /**
 494           * Flag set if GL_ARB_shading_language_420pack "binding" layout
 495           * qualifier is used.
 496           */
 497          unsigned explicit_binding:1;
 498
 499          /**
 500           * Flag set if GL_ARB_shader_atomic counter "offset" layout
 501           * qualifier is used.
 502           */
 503          unsigned explicit_offset:1;
 504
 505          /** \name Layout qualifiers for GL_AMD_conservative_depth */
 506          /** \{ */
 507          unsigned depth_any:1;
 508          unsigned depth_greater:1;
 509          unsigned depth_less:1;
 510          unsigned depth_unchanged:1;
 511          /** \} */
 512
 513          /** \name Layout qualifiers for GL_ARB_uniform_buffer_object */
 514          /** \{ */
 515          unsigned std140:1;
 516          unsigned std430:1;
 517          unsigned shared:1;
 518          unsigned packed:1;
 519          unsigned column_major:1;
 520          unsigned row_major:1;
 521          /** \} */
 522
 523          /** \name Layout qualifiers for GLSL 1.50 geometry shaders */
 524          /** \{ */
 525          unsigned prim_type:1;
 526          unsigned max_vertices:1;
 527          /** \} */
 528
 529          /**
 530           * local_size_{x,y,z} flags for compute shaders.  Bit 0 represents
 531           * local_size_x, and so on.
 532           */
 533          unsigned local_size:3;
 534
 535          /** \name Layout and memory qualifiers for ARB_shader_image_load_store. */
 536          /** \{ */
 537          unsigned early_fragment_tests:1;
 538          unsigned explicit_image_format:1;
 539          unsigned coherent:1;
 540          unsigned _volatile:1;
 541          unsigned restrict_flag:1;
 542          unsigned read_only:1; /**< "readonly" qualifier. */
 543          unsigned write_only:1; /**< "writeonly" qualifier. */
 544          /** \} */
 545
 546          /** \name Layout qualifiers for GL_ARB_gpu_shader5 */
 547          /** \{ */
 548          unsigned invocations:1;
 549          unsigned stream:1; /**< Has stream value assigned  */
 550          unsigned explicit_stream:1; /**< stream value assigned explicitly by shader code */
 551          /** \} */
 552
 553          /** \name Layout qualifiers for GL_ARB_tessellation_shader */
 554          /** \{ */
 555          /* tess eval input layout */
 556          /* gs prim_type reused for primitive mode */
 557          unsigned vertex_spacing:1;
 558          unsigned ordering:1;
 559          unsigned point_mode:1;
 560          /* tess control output layout */
 561          unsigned vertices:1;
 562          /** \} */
 563
 564          /** \name Qualifiers for GL_ARB_shader_subroutine */
 565          /** \{ */
 566          unsigned subroutine:1;  /**< Is this marked 'subroutine' */
 567          unsigned subroutine_def:1; /**< Is this marked 'subroutine' with a list of types */
 568          /** \} */
 569       }
 570       /** \brief Set of flags, accessed by name. */
 571       q;
 572
 573       /** \brief Set of flags, accessed as a bitmask. */
 574       uint64_t i;
 575    } flags;
 576
 577    /** Precision of the type (highp/medium/lowp). */
 578    unsigned precision:2;
 579
 580    /** Geometry shader invocations for GL_ARB_gpu_shader5. */
 581    ast_layout_expression *invocations;
 582
 583    /**
 584     * Location specified via GL_ARB_explicit_attrib_location layout
 585     *
 586     * \note
 587     * This field is only valid if \c explicit_location is set.
 588     */
 589    ast_expression *location;
 590    /**
 591     * Index specified via GL_ARB_explicit_attrib_location layout
 592     *
 593     * \note
 594     * This field is only valid if \c explicit_index is set.
 595     */
 596    ast_expression *index;
 597
 598    /** Maximum output vertices in GLSL 1.50 geometry shaders. */
 599    ast_layout_expression *max_vertices;
 600
 601    /** Stream in GLSL 1.50 geometry shaders. */
 602    ast_expression *stream;
 603
 604    /**
 605     * Input or output primitive type in GLSL 1.50 geometry shaders
 606     * and tessellation shaders.
 607     */
 608    GLenum prim_type;
 609
 610    /**
 611     * Binding specified via GL_ARB_shading_language_420pack's "binding" keyword.
 612     *
 613     * \note
 614     * This field is only valid if \c explicit_binding is set.
 615     */
 616    ast_expression *binding;
 617
 618    /**
 619     * Offset specified via GL_ARB_shader_atomic_counter's "offset"
 620     * keyword.
 621     *
 622     * \note
 623     * This field is only valid if \c explicit_offset is set.
 624     */
 625    ast_expression *offset;
 626
 627    /**
 628     * Local size specified via GL_ARB_compute_shader's "local_size_{x,y,z}"
 629     * layout qualifier.  Element i of this array is only valid if
 630     * flags.q.local_size & (1 << i) is set.
 631     */
 632    ast_layout_expression *local_size[3];
 633
 634    /** Tessellation evaluation shader: vertex spacing (equal, fractional even/odd) */
 635    GLenum vertex_spacing;
 636
 637    /** Tessellation evaluation shader: vertex ordering (CW or CCW) */
 638    GLenum ordering;
 639
 640    /** Tessellation evaluation shader: point mode */
 641    bool point_mode;
 642
 643    /** Tessellation control shader: number of output vertices */
 644    ast_layout_expression *vertices;
 645
 646    /**
 647     * Image format specified with an ARB_shader_image_load_store
 648     * layout qualifier.
 649     *
 650     * \note
 651     * This field is only valid if \c explicit_image_format is set.
 652     */
 653    GLenum image_format;
 654
 655    /**
 656     * Base type of the data read from or written to this image.  Only
 657     * the following enumerants are allowed: GLSL_TYPE_UINT,
 658     * GLSL_TYPE_INT, GLSL_TYPE_FLOAT.
 659     *
 660     * \note
 661     * This field is only valid if \c explicit_image_format is set.
 662     */
 663    glsl_base_type image_base_type;
 664
 665    /** Flag to know if this represents a default value for a qualifier */
 666    bool is_default_qualifier;
 667
 668    /**
 669     * Return true if and only if an interpolation qualifier is present.
 670     */
 671    bool has_interpolation() const;
 672
 673    /**
 674     * Return whether a layout qualifier is present.
 675     */
 676    bool has_layout() const;
 677
 678    /**
 679     * Return whether a storage qualifier is present.
 680     */
 681    bool has_storage() const;
 682
 683    /**
 684     * Return whether an auxiliary storage qualifier is present.
 685     */
 686    bool has_auxiliary_storage() const;
 687
 688    /**
 689     * \brief Return string representation of interpolation qualifier.
 690     *
 691     * If an interpolation qualifier is present, then return that qualifier's
 692     * string representation. Otherwise, return null. For example, if the
 693     * noperspective bit is set, then this returns "noperspective".
 694     *
 695     * If multiple interpolation qualifiers are somehow present, then the
 696     * returned string is undefined but not null.
 697     */
 698    const char *interpolation_string() const;
 699
 700    bool merge_qualifier(YYLTYPE *loc,
 701                         _mesa_glsl_parse_state *state,
 702                         const ast_type_qualifier &q,
 703                         bool is_single_layout_merge);
 704
 705    bool merge_out_qualifier(YYLTYPE *loc,
 706                            _mesa_glsl_parse_state *state,
 707                            const ast_type_qualifier &q,
 708                            ast_node* &node, bool create_node);
 709
 710    bool merge_in_qualifier(YYLTYPE *loc,
 711                            _mesa_glsl_parse_state *state,
 712                            const ast_type_qualifier &q,
 713                            ast_node* &node, bool create_node);
 714
 715    ast_subroutine_list *subroutine_list;
 716 };
 717
 718 class ast_declarator_list;
 719
 720 class ast_struct_specifier : public ast_node {
 721 public:
 722    ast_struct_specifier(const char *identifier,
 723                         ast_declarator_list *declarator_list);
 724    virtual void print(void) const;
 725
 726    virtual ir_rvalue *hir(exec_list *instructions,
 727                           struct _mesa_glsl_parse_state *state);
 728
 729    const char *name;
 730    ast_type_qualifier *layout;
 731    /* List of ast_declarator_list * */
 732    exec_list declarations;
 733    bool is_declaration;
 734 };
 735
 736
 737
 738 class ast_type_specifier : public ast_node {
 739 public:
 740    /** Construct a type specifier from a type name */
 741    ast_type_specifier(const char *name)
 742       : type_name(name), structure(NULL), array_specifier(NULL),
 743         default_precision(ast_precision_none)
 744    {
 745       /* empty */
 746    }
 747
 748    /** Construct a type specifier from a structure definition */
 749    ast_type_specifier(ast_struct_specifier *s)
 750       : type_name(s->name), structure(s), array_specifier(NULL),
 751         default_precision(ast_precision_none)
 752    {
 753       /* empty */
 754    }
 755
 756    const struct glsl_type *glsl_type(const char **name,
 757                                      struct _mesa_glsl_parse_state *state)
 758       const;
 759
 760    virtual void print(void) const;
 761
 762    ir_rvalue *hir(exec_list *, struct _mesa_glsl_parse_state *);
 763
 764    const char *type_name;
 765    ast_struct_specifier *structure;
 766
 767    ast_array_specifier *array_specifier;
 768
 769    /** For precision statements, this is the given precision; otherwise none. */
 770    unsigned default_precision:2;
 771 };
 772
 773
 774 class ast_fully_specified_type : public ast_node {
 775 public:
 776    virtual void print(void) const;
 777    bool has_qualifiers(_mesa_glsl_parse_state *state) const;
 778
 779    ast_fully_specified_type() : qualifier(), specifier(NULL)
 780    {
 781    }
 782
 783    const struct glsl_type *glsl_type(const char **name,
 784                                      struct _mesa_glsl_parse_state *state)
 785       const;
 786
 787    ast_type_qualifier qualifier;
 788    ast_type_specifier *specifier;
 789 };
 790
 791
 792 class ast_declarator_list : public ast_node {
 793 public:
 794    ast_declarator_list(ast_fully_specified_type *);
 795    virtual void print(void) const;
 796
 797    virtual ir_rvalue *hir(exec_list *instructions,
 798                           struct _mesa_glsl_parse_state *state);
 799
 800    ast_fully_specified_type *type;
 801    /** List of 'ast_declaration *' */
 802    exec_list declarations;
 803
 804    /**
 805     * Flags for redeclarations. In these cases, no type is specified, to
 806     * `type` is allowed to be NULL. In all other cases, this would be an error.
 807     */
 808    int invariant;     /** < `invariant` redeclaration */
 809    int precise;       /** < `precise` redeclaration */
 810 };
 811
 812
 813 class ast_parameter_declarator : public ast_node {
 814 public:
 815    ast_parameter_declarator() :
 816       type(NULL),
 817       identifier(NULL),
 818       array_specifier(NULL),
 819       formal_parameter(false),
 820       is_void(false)
 821    {
 822       /* empty */
 823    }
 824
 825    virtual void print(void) const;
 826
 827    virtual ir_rvalue *hir(exec_list *instructions,
 828                           struct _mesa_glsl_parse_state *state);
 829
 830    ast_fully_specified_type *type;
 831    const char *identifier;
 832    ast_array_specifier *array_specifier;
 833
 834    static void parameters_to_hir(exec_list *ast_parameters,
 835                                  bool formal, exec_list *ir_parameters,
 836                                  struct _mesa_glsl_parse_state *state);
 837
 838 private:
 839    /** Is this parameter declaration part of a formal parameter list? */
 840    bool formal_parameter;
 841
 842    /**
 843     * Is this parameter 'void' type?
 844     *
 845     * This field is set by \c ::hir.
 846     */
 847    bool is_void;
 848 };
 849
 850
 851 class ast_function : public ast_node {
 852 public:
 853    ast_function(void);
 854
 855    virtual void print(void) const;
 856
 857    virtual ir_rvalue *hir(exec_list *instructions,
 858                           struct _mesa_glsl_parse_state *state);
 859
 860    ast_fully_specified_type *return_type;
 861    const char *identifier;
 862
 863    exec_list parameters;
 864
 865 private:
 866    /**
 867     * Is this prototype part of the function definition?
 868     *
 869     * Used by ast_function_definition::hir to process the parameters, etc.
 870     * of the function.
 871     *
 872     * \sa ::hir
 873     */
 874    bool is_definition;
 875
 876    /**
 877     * Function signature corresponding to this function prototype instance
 878     *
 879     * Used by ast_function_definition::hir to process the parameters, etc.
 880     * of the function.
 881     *
 882     * \sa ::hir
 883     */
 884    class ir_function_signature *signature;
 885
 886    friend class ast_function_definition;
 887 };
 888
 889
 890 class ast_expression_statement : public ast_node {
 891 public:
 892    ast_expression_statement(ast_expression *);
 893    virtual void print(void) const;
 894
 895    virtual ir_rvalue *hir(exec_list *instructions,
 896                           struct _mesa_glsl_parse_state *state);
 897
 898    ast_expression *expression;
 899 };
 900
 901
 902 class ast_case_label : public ast_node {
 903 public:
 904    ast_case_label(ast_expression *test_value);
 905    virtual void print(void) const;
 906
 907    virtual ir_rvalue *hir(exec_list *instructions,
 908                           struct _mesa_glsl_parse_state *state);
 909
 910    /**
 911     * An test value of NULL means 'default'.
 912     */
 913    ast_expression *test_value;
 914 };
 915
 916
 917 class ast_case_label_list : public ast_node {
 918 public:
 919    ast_case_label_list(void);
 920    virtual void print(void) const;
 921
 922    virtual ir_rvalue *hir(exec_list *instructions,
 923                           struct _mesa_glsl_parse_state *state);
 924
 925    /**
 926     * A list of case labels.
 927     */
 928    exec_list labels;
 929 };
 930
 931
 932 class ast_case_statement : public ast_node {
 933 public:
 934    ast_case_statement(ast_case_label_list *labels);
 935    virtual void print(void) const;
 936
 937    virtual ir_rvalue *hir(exec_list *instructions,
 938                           struct _mesa_glsl_parse_state *state);
 939
 940    ast_case_label_list *labels;
 941
 942    /**
 943     * A list of statements.
 944     */
 945    exec_list stmts;
 946 };
 947
 948
 949 class ast_case_statement_list : public ast_node {
 950 public:
 951    ast_case_statement_list(void);
 952    virtual void print(void) const;
 953
 954    virtual ir_rvalue *hir(exec_list *instructions,
 955                           struct _mesa_glsl_parse_state *state);
 956
 957    /**
 958     * A list of cases.
 959     */
 960    exec_list cases;
 961 };
 962
 963
 964 class ast_switch_body : public ast_node {
 965 public:
 966    ast_switch_body(ast_case_statement_list *stmts);
 967    virtual void print(void) const;
 968
 969    virtual ir_rvalue *hir(exec_list *instructions,
 970                           struct _mesa_glsl_parse_state *state);
 971
 972    ast_case_statement_list *stmts;
 973 };
 974
 975
 976 class ast_selection_statement : public ast_node {
 977 public:
 978    ast_selection_statement(ast_expression *condition,
 979                            ast_node *then_statement,
 980                            ast_node *else_statement);
 981    virtual void print(void) const;
 982
 983    virtual ir_rvalue *hir(exec_list *instructions,
 984                           struct _mesa_glsl_parse_state *state);
 985
 986    ast_expression *condition;
 987    ast_node *then_statement;
 988    ast_node *else_statement;
 989 };
 990
 991
 992 class ast_switch_statement : public ast_node {
 993 public:
 994    ast_switch_statement(ast_expression *test_expression,
 995                         ast_node *body);
 996    virtual void print(void) const;
 997
 998    virtual ir_rvalue *hir(exec_list *instructions,
 999                           struct _mesa_glsl_parse_state *state);
1000
1001    ast_expression *test_expression;
1002    ast_node *body;
1003
1004 protected:
1005    void test_to_hir(exec_list *, struct _mesa_glsl_parse_state *);
1006 };
1007
1008 class ast_iteration_statement : public ast_node {
1009 public:
1010    ast_iteration_statement(int mode, ast_node *init, ast_node *condition,
1011                            ast_expression *rest_expression, ast_node *body);
1012
1013    virtual void print(void) const;
1014
1015    virtual ir_rvalue *hir(exec_list *, struct _mesa_glsl_parse_state *);
1016
1017    enum ast_iteration_modes {
1018       ast_for,
1019       ast_while,
1020       ast_do_while
1021    } mode;
1022
1023
1024    ast_node *init_statement;
1025    ast_node *condition;
1026    ast_expression *rest_expression;
1027
1028    ast_node *body;
1029
1030    /**
1031     * Generate IR from the condition of a loop
1032     *
1033     * This is factored out of ::hir because some loops have the condition
1034     * test at the top (for and while), and others have it at the end (do-while).
1035     */
1036    void condition_to_hir(exec_list *, struct _mesa_glsl_parse_state *);
1037 };
1038
1039
1040 class ast_jump_statement : public ast_node {
1041 public:
1042    ast_jump_statement(int mode, ast_expression *return_value);
1043    virtual void print(void) const;
1044
1045    virtual ir_rvalue *hir(exec_list *instructions,
1046                           struct _mesa_glsl_parse_state *state);
1047
1048    enum ast_jump_modes {
1049       ast_continue,
1050       ast_break,
1051       ast_return,
1052       ast_discard
1053    } mode;
1054
1055    ast_expression *opt_return_value;
1056 };
1057
1058
1059 class ast_function_definition : public ast_node {
1060 public:
1061    ast_function_definition() : prototype(NULL), body(NULL)
1062    {
1063    }
1064
1065    virtual void print(void) const;
1066
1067    virtual ir_rvalue *hir(exec_list *instructions,
1068                           struct _mesa_glsl_parse_state *state);
1069
1070    ast_function *prototype;
1071    ast_compound_statement *body;
1072 };
1073
1074 class ast_interface_block : public ast_node {
1075 public:
1076    ast_interface_block(ast_type_qualifier layout,
1077                        const char *instance_name,
1078                        ast_array_specifier *array_specifier)
1079    : layout(layout), block_name(NULL), instance_name(instance_name),
1080      array_specifier(array_specifier)
1081    {
1082    }
1083
1084    virtual ir_rvalue *hir(exec_list *instructions,
1085                           struct _mesa_glsl_parse_state *state);
1086
1087    ast_type_qualifier layout;
1088    const char *block_name;
1089
1090    /**
1091     * Declared name of the block instance, if specified.
1092     *
1093     * If the block does not have an instance name, this field will be
1094     * \c NULL.
1095     */
1096    const char *instance_name;
1097
1098    /** List of ast_declarator_list * */
1099    exec_list declarations;
1100
1101    /**
1102     * Declared array size of the block instance
1103     *
1104     * If the block is not declared as an array or if the block instance array
1105     * is unsized, this field will be \c NULL.
1106     */
1107    ast_array_specifier *array_specifier;
1108 };
1109
1110
1111 /**
1112  * AST node representing a declaration of the output layout for tessellation
1113  * control shaders.
1114  */
1115 class ast_tcs_output_layout : public ast_node
1116 {
1117 public:
1118    ast_tcs_output_layout(const struct YYLTYPE &locp)
1119    {
1120       set_location(locp);
1121    }
1122
1123    virtual ir_rvalue *hir(exec_list *instructions,
1124                           struct _mesa_glsl_parse_state *state);
1125 };
1126
1127
1128 /**
1129  * AST node representing a declaration of the input layout for geometry
1130  * shaders.
1131  */
1132 class ast_gs_input_layout : public ast_node
1133 {
1134 public:
1135    ast_gs_input_layout(const struct YYLTYPE &locp, GLenum prim_type)
1136       : prim_type(prim_type)
1137    {
1138       set_location(locp);
1139    }
1140
1141    virtual ir_rvalue *hir(exec_list *instructions,
1142                           struct _mesa_glsl_parse_state *state);
1143
1144 private:
1145    const GLenum prim_type;
1146 };
1147
1148
1149 /**
1150  * AST node representing a decalaration of the input layout for compute
1151  * shaders.
1152  */
1153 class ast_cs_input_layout : public ast_node
1154 {
1155 public:
1156    ast_cs_input_layout(const struct YYLTYPE &locp,
1157                        ast_layout_expression *const *local_size)
1158    {
1159       for (int i = 0; i < 3; i++) {
1160          this->local_size[i] = local_size[i];
1161       }
1162       set_location(locp);
1163    }
1164
1165    virtual ir_rvalue *hir(exec_list *instructions,
1166                           struct _mesa_glsl_parse_state *state);
1167
1168 private:
1169    ast_layout_expression *local_size[3];
1170 };
1171
1172 /*@}*/
1173
1174 extern void
1175 _mesa_ast_to_hir(exec_list *instructions, struct _mesa_glsl_parse_state *state);
1176
1177 extern ir_rvalue *
1178 _mesa_ast_field_selection_to_hir(const ast_expression *expr,
1179                                  exec_list *instructions,
1180                                  struct _mesa_glsl_parse_state *state);
1181
1182 extern ir_rvalue *
1183 _mesa_ast_array_index_to_hir(void *mem_ctx,
1184                              struct _mesa_glsl_parse_state *state,
1185                              ir_rvalue *array, ir_rvalue *idx,
1186                              YYLTYPE &loc, YYLTYPE &idx_loc);
1187
1188 extern void
1189 _mesa_ast_set_aggregate_type(const glsl_type *type,
1190                              ast_expression *expr);
1191
1192 void
1193 emit_function(_mesa_glsl_parse_state *state, ir_function *f);
1194
1195 extern void
1196 check_builtin_array_max_size(const char *name, unsigned size,
1197                              YYLTYPE loc, struct _mesa_glsl_parse_state *state);
1198
1199 extern void _mesa_ast_process_interface_block(YYLTYPE *locp,
1200                                               _mesa_glsl_parse_state *state,
1201                                               ast_interface_block *const block,
1202                                               const struct ast_type_qualifier &q);
1203
1204 #endif /* AST_H */