src/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    /**
  66     * Retrieve the source location of an AST node
  67     *
  68     * This function is primarily used to get the source position of an AST node
  69     * into a form that can be passed to \c _mesa_glsl_error.
  70     *
  71     * \sa _mesa_glsl_error, ast_node::set_location
  72     */
  73    struct YYLTYPE get_location(void) const
  74    {
  75       struct YYLTYPE locp;
  76
  77       locp.source = this->location.source;
  78       locp.first_line = this->location.line;
  79       locp.first_column = this->location.column;
  80       locp.last_line = locp.first_line;
  81       locp.last_column = locp.first_column;
  82
  83       return locp;
  84    }
  85
  86    /**
  87     * Set the source location of an AST node from a parser location
  88     *
  89     * \sa ast_node::get_location
  90     */
  91    void set_location(const struct YYLTYPE &locp)
  92    {
  93       this->location.source = locp.source;
  94       this->location.line = locp.first_line;
  95       this->location.column = locp.first_column;
  96    }
  97
  98    /**
  99     * Source location of the AST node.
 100     */
 101    struct {
 102       unsigned source;    /**< GLSL source number. */
 103       unsigned line;      /**< Line number within the source string. */
 104       unsigned column;    /**< Column in the line. */
 105    } location;
 106
 107    exec_node link;
 108
 109 protected:
 110    /**
 111     * The only constructor is protected so that only derived class objects can
 112     * be created.
 113     */
 114    ast_node(void);
 115 };
 116
 117
 118 /**
 119  * Operators for AST expression nodes.
 120  */
 121 enum ast_operators {
 122    ast_assign,
 123    ast_plus,        /**< Unary + operator. */
 124    ast_neg,
 125    ast_add,
 126    ast_sub,
 127    ast_mul,
 128    ast_div,
 129    ast_mod,
 130    ast_lshift,
 131    ast_rshift,
 132    ast_less,
 133    ast_greater,
 134    ast_lequal,
 135    ast_gequal,
 136    ast_equal,
 137    ast_nequal,
 138    ast_bit_and,
 139    ast_bit_xor,
 140    ast_bit_or,
 141    ast_bit_not,
 142    ast_logic_and,
 143    ast_logic_xor,
 144    ast_logic_or,
 145    ast_logic_not,
 146
 147    ast_mul_assign,
 148    ast_div_assign,
 149    ast_mod_assign,
 150    ast_add_assign,
 151    ast_sub_assign,
 152    ast_ls_assign,
 153    ast_rs_assign,
 154    ast_and_assign,
 155    ast_xor_assign,
 156    ast_or_assign,
 157
 158    ast_conditional,
 159
 160    ast_pre_inc,
 161    ast_pre_dec,
 162    ast_post_inc,
 163    ast_post_dec,
 164    ast_field_selection,
 165    ast_array_index,
 166
 167    ast_function_call,
 168
 169    ast_identifier,
 170    ast_int_constant,
 171    ast_uint_constant,
 172    ast_float_constant,
 173    ast_bool_constant,
 174
 175    ast_sequence,
 176    ast_aggregate
 177 };
 178
 179 /**
 180  * Representation of any sort of expression.
 181  */
 182 class ast_expression : public ast_node {
 183 public:
 184    ast_expression(int oper, ast_expression *,
 185                   ast_expression *, ast_expression *);
 186
 187    ast_expression(const char *identifier) :
 188       oper(ast_identifier)
 189    {
 190       subexpressions[0] = NULL;
 191       subexpressions[1] = NULL;
 192       subexpressions[2] = NULL;
 193       primary_expression.identifier = identifier;
 194       this->non_lvalue_description = NULL;
 195    }
 196
 197    static const char *operator_string(enum ast_operators op);
 198
 199    virtual ir_rvalue *hir(exec_list *instructions,
 200                           struct _mesa_glsl_parse_state *state);
 201
 202    virtual void print(void) const;
 203
 204    enum ast_operators oper;
 205
 206    ast_expression *subexpressions[3];
 207
 208    union {
 209       const char *identifier;
 210       int int_constant;
 211       float float_constant;
 212       unsigned uint_constant;
 213       int bool_constant;
 214    } primary_expression;
 215
 216
 217    /**
 218     * List of expressions for an \c ast_sequence or parameters for an
 219     * \c ast_function_call
 220     */
 221    exec_list expressions;
 222
 223    /**
 224     * For things that can't be l-values, this describes what it is.
 225     *
 226     * This text is used by the code that generates IR for assignments to
 227     * detect and emit useful messages for assignments to some things that
 228     * can't be l-values.  For example, pre- or post-incerement expressions.
 229     *
 230     * \note
 231     * This pointer may be \c NULL.
 232     */
 233    const char *non_lvalue_description;
 234 };
 235
 236 class ast_expression_bin : public ast_expression {
 237 public:
 238    ast_expression_bin(int oper, ast_expression *, ast_expression *);
 239
 240    virtual void print(void) const;
 241 };
 242
 243 /**
 244  * Subclass of expressions for function calls
 245  */
 246 class ast_function_expression : public ast_expression {
 247 public:
 248    ast_function_expression(ast_expression *callee)
 249       : ast_expression(ast_function_call, callee,
 250                        NULL, NULL),
 251         cons(false)
 252    {
 253       /* empty */
 254    }
 255
 256    ast_function_expression(class ast_type_specifier *type)
 257       : ast_expression(ast_function_call, (ast_expression *) type,
 258                        NULL, NULL),
 259         cons(true)
 260    {
 261       /* empty */
 262    }
 263
 264    bool is_constructor() const
 265    {
 266       return cons;
 267    }
 268
 269    virtual ir_rvalue *hir(exec_list *instructions,
 270                           struct _mesa_glsl_parse_state *state);
 271
 272 private:
 273    /**
 274     * Is this function call actually a constructor?
 275     */
 276    bool cons;
 277 };
 278
 279 class ast_array_specifier : public ast_node {
 280 public:
 281    /** Unsized array specifier ([]) */
 282    explicit ast_array_specifier(const struct YYLTYPE &locp)
 283      : dimension_count(1), is_unsized_array(true)
 284    {
 285       set_location(locp);
 286    }
 287
 288    /** Sized array specifier ([dim]) */
 289    ast_array_specifier(const struct YYLTYPE &locp, ast_expression *dim)
 290      : dimension_count(1), is_unsized_array(false)
 291    {
 292       set_location(locp);
 293       array_dimensions.push_tail(&dim->link);
 294    }
 295
 296    void add_dimension(ast_expression *dim)
 297    {
 298       array_dimensions.push_tail(&dim->link);
 299       dimension_count++;
 300    }
 301
 302    virtual void print(void) const;
 303
 304    /* Count including sized and unsized dimensions */
 305    unsigned dimension_count;
 306
 307    /* If true, this means that the array has an unsized outermost dimension. */
 308    bool is_unsized_array;
 309
 310    /* This list contains objects of type ast_node containing the
 311     * sized dimensions only, in outermost-to-innermost order.
 312     */
 313    exec_list array_dimensions;
 314 };
 315
 316 /**
 317  * C-style aggregate initialization class
 318  *
 319  * Represents C-style initializers of vectors, matrices, arrays, and
 320  * structures. E.g., vec3 pos = {1.0, 0.0, -1.0} is equivalent to
 321  * vec3 pos = vec3(1.0, 0.0, -1.0).
 322  *
 323  * Specified in GLSL 4.20 and GL_ARB_shading_language_420pack.
 324  *
 325  * \sa _mesa_ast_set_aggregate_type
 326  */
 327 class ast_aggregate_initializer : public ast_expression {
 328 public:
 329    ast_aggregate_initializer()
 330       : ast_expression(ast_aggregate, NULL, NULL, NULL),
 331         constructor_type(NULL)
 332    {
 333       /* empty */
 334    }
 335
 336    /**
 337     * glsl_type of the aggregate, which is inferred from the LHS of whatever
 338     * the aggregate is being used to initialize.  This can't be inferred at
 339     * parse time (since the parser deals with ast_type_specifiers, not
 340     * glsl_types), so the parser leaves it NULL.  However, the ast-to-hir
 341     * conversion code makes sure to fill it in with the appropriate type
 342     * before hir() is called.
 343     */
 344    const glsl_type *constructor_type;
 345
 346    virtual ir_rvalue *hir(exec_list *instructions,
 347                           struct _mesa_glsl_parse_state *state);
 348 };
 349
 350 /**
 351  * Number of possible operators for an ast_expression
 352  *
 353  * This is done as a define instead of as an additional value in the enum so
 354  * that the compiler won't generate spurious messages like "warning:
 355  * enumeration value ‘ast_num_operators’ not handled in switch"
 356  */
 357 #define AST_NUM_OPERATORS (ast_sequence + 1)
 358
 359
 360 class ast_compound_statement : public ast_node {
 361 public:
 362    ast_compound_statement(int new_scope, ast_node *statements);
 363    virtual void print(void) const;
 364
 365    virtual ir_rvalue *hir(exec_list *instructions,
 366                           struct _mesa_glsl_parse_state *state);
 367
 368    int new_scope;
 369    exec_list statements;
 370 };
 371
 372 class ast_declaration : public ast_node {
 373 public:
 374    ast_declaration(const char *identifier,
 375                    ast_array_specifier *array_specifier,
 376                    ast_expression *initializer);
 377    virtual void print(void) const;
 378
 379    const char *identifier;
 380
 381    ast_array_specifier *array_specifier;
 382
 383    ast_expression *initializer;
 384 };
 385
 386
 387 enum {
 388    ast_precision_none = 0, /**< Absence of precision qualifier. */
 389    ast_precision_high,
 390    ast_precision_medium,
 391    ast_precision_low
 392 };
 393
 394 struct ast_type_qualifier {
 395    DECLARE_RALLOC_CXX_OPERATORS(ast_type_qualifier);
 396
 397    union {
 398       struct {
 399          unsigned invariant:1;
 400          unsigned constant:1;
 401          unsigned attribute:1;
 402          unsigned varying:1;
 403          unsigned in:1;
 404          unsigned out:1;
 405          unsigned centroid:1;
 406          unsigned sample:1;
 407          unsigned uniform:1;
 408          unsigned smooth:1;
 409          unsigned flat:1;
 410          unsigned noperspective:1;
 411
 412          /** \name Layout qualifiers for GL_ARB_fragment_coord_conventions */
 413          /*@{*/
 414          unsigned origin_upper_left:1;
 415          unsigned pixel_center_integer:1;
 416          /*@}*/
 417
 418          /**
 419           * Flag set if GL_ARB_explicit_attrib_location "location" layout
 420           * qualifier is used.
 421           */
 422          unsigned explicit_location:1;
 423          /**
 424           * Flag set if GL_ARB_explicit_attrib_location "index" layout
 425           * qualifier is used.
 426           */
 427          unsigned explicit_index:1;
 428
 429          /**
 430           * Flag set if GL_ARB_shading_language_420pack "binding" layout
 431           * qualifier is used.
 432           */
 433          unsigned explicit_binding:1;
 434
 435          /**
 436           * Flag set if GL_ARB_shader_atomic counter "offset" layout
 437           * qualifier is used.
 438           */
 439          unsigned explicit_offset:1;
 440
 441          /** \name Layout qualifiers for GL_AMD_conservative_depth */
 442          /** \{ */
 443          unsigned depth_any:1;
 444          unsigned depth_greater:1;
 445          unsigned depth_less:1;
 446          unsigned depth_unchanged:1;
 447          /** \} */
 448
 449          /** \name Layout qualifiers for GL_ARB_uniform_buffer_object */
 450          /** \{ */
 451          unsigned std140:1;
 452          unsigned shared:1;
 453          unsigned packed:1;
 454          unsigned column_major:1;
 455          unsigned row_major:1;
 456          /** \} */
 457
 458          /** \name Layout qualifiers for GLSL 1.50 geometry shaders */
 459          /** \{ */
 460          unsigned prim_type:1;
 461          unsigned max_vertices:1;
 462          /** \} */
 463       }
 464       /** \brief Set of flags, accessed by name. */
 465       q;
 466
 467       /** \brief Set of flags, accessed as a bitmask. */
 468       unsigned i;
 469    } flags;
 470
 471    /** Precision of the type (highp/medium/lowp). */
 472    unsigned precision:2;
 473
 474    /**
 475     * Location specified via GL_ARB_explicit_attrib_location layout
 476     *
 477     * \note
 478     * This field is only valid if \c explicit_location is set.
 479     */
 480    int location;
 481    /**
 482     * Index specified via GL_ARB_explicit_attrib_location layout
 483     *
 484     * \note
 485     * This field is only valid if \c explicit_index is set.
 486     */
 487    int index;
 488
 489    /** Maximum output vertices in GLSL 1.50 geometry shaders. */
 490    int max_vertices;
 491
 492    /** Input or output primitive type in GLSL 1.50 geometry shaders */
 493    GLenum prim_type;
 494
 495    /**
 496     * Binding specified via GL_ARB_shading_language_420pack's "binding" keyword.
 497     *
 498     * \note
 499     * This field is only valid if \c explicit_binding is set.
 500     */
 501    int binding;
 502
 503    /**
 504     * Offset specified via GL_ARB_shader_atomic_counter's "offset"
 505     * keyword.
 506     *
 507     * \note
 508     * This field is only valid if \c explicit_offset is set.
 509     */
 510    int offset;
 511
 512    /**
 513     * Return true if and only if an interpolation qualifier is present.
 514     */
 515    bool has_interpolation() const;
 516
 517    /**
 518     * Return whether a layout qualifier is present.
 519     */
 520    bool has_layout() const;
 521
 522    /**
 523     * Return whether a storage qualifier is present.
 524     */
 525    bool has_storage() const;
 526
 527    /**
 528     * Return whether an auxiliary storage qualifier is present.
 529     */
 530    bool has_auxiliary_storage() const;
 531
 532    /**
 533     * \brief Return string representation of interpolation qualifier.
 534     *
 535     * If an interpolation qualifier is present, then return that qualifier's
 536     * string representation. Otherwise, return null. For example, if the
 537     * noperspective bit is set, then this returns "noperspective".
 538     *
 539     * If multiple interpolation qualifiers are somehow present, then the
 540     * returned string is undefined but not null.
 541     */
 542    const char *interpolation_string() const;
 543
 544    bool merge_qualifier(YYLTYPE *loc,
 545                         _mesa_glsl_parse_state *state,
 546                         ast_type_qualifier q);
 547 };
 548
 549 class ast_declarator_list;
 550
 551 class ast_struct_specifier : public ast_node {
 552 public:
 553    /**
 554     * \brief Make a shallow copy of an ast_struct_specifier.
 555     *
 556     * Use only if the objects are allocated from the same context and will not
 557     * be modified. Zeros the inherited ast_node's fields.
 558     */
 559    ast_struct_specifier(const ast_struct_specifier& that):
 560       ast_node(), name(that.name), declarations(that.declarations),
 561       is_declaration(that.is_declaration)
 562    {
 563       /* empty */
 564    }
 565
 566    ast_struct_specifier(const char *identifier,
 567                         ast_declarator_list *declarator_list);
 568    virtual void print(void) const;
 569
 570    virtual ir_rvalue *hir(exec_list *instructions,
 571                           struct _mesa_glsl_parse_state *state);
 572
 573    const char *name;
 574    /* List of ast_declarator_list * */
 575    exec_list declarations;
 576    bool is_declaration;
 577 };
 578
 579
 580
 581 class ast_type_specifier : public ast_node {
 582 public:
 583    /**
 584     * \brief Make a shallow copy of an ast_type_specifier, specifying array
 585     *        fields.
 586     *
 587     * Use only if the objects are allocated from the same context and will not
 588     * be modified. Zeros the inherited ast_node's fields.
 589     */
 590    ast_type_specifier(const ast_type_specifier *that,
 591                       ast_array_specifier *array_specifier)
 592       : ast_node(), type_name(that->type_name), structure(that->structure),
 593         array_specifier(array_specifier),
 594         default_precision(that->default_precision)
 595    {
 596       /* empty */
 597    }
 598
 599    /** Construct a type specifier from a type name */
 600    ast_type_specifier(const char *name)
 601       : type_name(name), structure(NULL), array_specifier(NULL),
 602         default_precision(ast_precision_none)
 603    {
 604       /* empty */
 605    }
 606
 607    /** Construct a type specifier from a structure definition */
 608    ast_type_specifier(ast_struct_specifier *s)
 609       : type_name(s->name), structure(s), array_specifier(NULL),
 610         default_precision(ast_precision_none)
 611    {
 612       /* empty */
 613    }
 614
 615    const struct glsl_type *glsl_type(const char **name,
 616                                      struct _mesa_glsl_parse_state *state)
 617       const;
 618
 619    virtual void print(void) const;
 620
 621    ir_rvalue *hir(exec_list *, struct _mesa_glsl_parse_state *);
 622
 623    const char *type_name;
 624    ast_struct_specifier *structure;
 625
 626    ast_array_specifier *array_specifier;
 627
 628    /** For precision statements, this is the given precision; otherwise none. */
 629    unsigned default_precision:2;
 630 };
 631
 632
 633 class ast_fully_specified_type : public ast_node {
 634 public:
 635    virtual void print(void) const;
 636    bool has_qualifiers() const;
 637
 638    ast_fully_specified_type() : qualifier(), specifier(NULL)
 639    {
 640    }
 641
 642    const struct glsl_type *glsl_type(const char **name,
 643                                      struct _mesa_glsl_parse_state *state)
 644       const;
 645
 646    ast_type_qualifier qualifier;
 647    ast_type_specifier *specifier;
 648 };
 649
 650
 651 class ast_declarator_list : public ast_node {
 652 public:
 653    ast_declarator_list(ast_fully_specified_type *);
 654    virtual void print(void) const;
 655
 656    virtual ir_rvalue *hir(exec_list *instructions,
 657                           struct _mesa_glsl_parse_state *state);
 658
 659    ast_fully_specified_type *type;
 660    /** List of 'ast_declaration *' */
 661    exec_list declarations;
 662
 663    /**
 664     * Special flag for vertex shader "invariant" declarations.
 665     *
 666     * Vertex shaders can contain "invariant" variable redeclarations that do
 667     * not include a type.  For example, "invariant gl_Position;".  This flag
 668     * is used to note these cases when no type is specified.
 669     */
 670    int invariant;
 671 };
 672
 673
 674 class ast_parameter_declarator : public ast_node {
 675 public:
 676    ast_parameter_declarator() :
 677       type(NULL),
 678       identifier(NULL),
 679       array_specifier(NULL),
 680       formal_parameter(false),
 681       is_void(false)
 682    {
 683       /* empty */
 684    }
 685
 686    virtual void print(void) const;
 687
 688    virtual ir_rvalue *hir(exec_list *instructions,
 689                           struct _mesa_glsl_parse_state *state);
 690
 691    ast_fully_specified_type *type;
 692    const char *identifier;
 693    ast_array_specifier *array_specifier;
 694
 695    static void parameters_to_hir(exec_list *ast_parameters,
 696                                  bool formal, exec_list *ir_parameters,
 697                                  struct _mesa_glsl_parse_state *state);
 698
 699 private:
 700    /** Is this parameter declaration part of a formal parameter list? */
 701    bool formal_parameter;
 702
 703    /**
 704     * Is this parameter 'void' type?
 705     *
 706     * This field is set by \c ::hir.
 707     */
 708    bool is_void;
 709 };
 710
 711
 712 class ast_function : public ast_node {
 713 public:
 714    ast_function(void);
 715
 716    virtual void print(void) const;
 717
 718    virtual ir_rvalue *hir(exec_list *instructions,
 719                           struct _mesa_glsl_parse_state *state);
 720
 721    ast_fully_specified_type *return_type;
 722    const char *identifier;
 723
 724    exec_list parameters;
 725
 726 private:
 727    /**
 728     * Is this prototype part of the function definition?
 729     *
 730     * Used by ast_function_definition::hir to process the parameters, etc.
 731     * of the function.
 732     *
 733     * \sa ::hir
 734     */
 735    bool is_definition;
 736
 737    /**
 738     * Function signature corresponding to this function prototype instance
 739     *
 740     * Used by ast_function_definition::hir to process the parameters, etc.
 741     * of the function.
 742     *
 743     * \sa ::hir
 744     */
 745    class ir_function_signature *signature;
 746
 747    friend class ast_function_definition;
 748 };
 749
 750
 751 class ast_expression_statement : public ast_node {
 752 public:
 753    ast_expression_statement(ast_expression *);
 754    virtual void print(void) const;
 755
 756    virtual ir_rvalue *hir(exec_list *instructions,
 757                           struct _mesa_glsl_parse_state *state);
 758
 759    ast_expression *expression;
 760 };
 761
 762
 763 class ast_case_label : public ast_node {
 764 public:
 765    ast_case_label(ast_expression *test_value);
 766    virtual void print(void) const;
 767
 768    virtual ir_rvalue *hir(exec_list *instructions,
 769                           struct _mesa_glsl_parse_state *state);
 770
 771    /**
 772     * An test value of NULL means 'default'.
 773     */
 774    ast_expression *test_value;
 775 };
 776
 777
 778 class ast_case_label_list : public ast_node {
 779 public:
 780    ast_case_label_list(void);
 781    virtual void print(void) const;
 782
 783    virtual ir_rvalue *hir(exec_list *instructions,
 784                           struct _mesa_glsl_parse_state *state);
 785
 786    /**
 787     * A list of case labels.
 788     */
 789    exec_list labels;
 790 };
 791
 792
 793 class ast_case_statement : public ast_node {
 794 public:
 795    ast_case_statement(ast_case_label_list *labels);
 796    virtual void print(void) const;
 797
 798    virtual ir_rvalue *hir(exec_list *instructions,
 799                           struct _mesa_glsl_parse_state *state);
 800
 801    ast_case_label_list *labels;
 802
 803    /**
 804     * A list of statements.
 805     */
 806    exec_list stmts;
 807 };
 808
 809
 810 class ast_case_statement_list : public ast_node {
 811 public:
 812    ast_case_statement_list(void);
 813    virtual void print(void) const;
 814
 815    virtual ir_rvalue *hir(exec_list *instructions,
 816                           struct _mesa_glsl_parse_state *state);
 817
 818    /**
 819     * A list of cases.
 820     */
 821    exec_list cases;
 822 };
 823
 824
 825 class ast_switch_body : public ast_node {
 826 public:
 827    ast_switch_body(ast_case_statement_list *stmts);
 828    virtual void print(void) const;
 829
 830    virtual ir_rvalue *hir(exec_list *instructions,
 831                           struct _mesa_glsl_parse_state *state);
 832
 833    ast_case_statement_list *stmts;
 834 };
 835
 836
 837 class ast_selection_statement : public ast_node {
 838 public:
 839    ast_selection_statement(ast_expression *condition,
 840                            ast_node *then_statement,
 841                            ast_node *else_statement);
 842    virtual void print(void) const;
 843
 844    virtual ir_rvalue *hir(exec_list *instructions,
 845                           struct _mesa_glsl_parse_state *state);
 846
 847    ast_expression *condition;
 848    ast_node *then_statement;
 849    ast_node *else_statement;
 850 };
 851
 852
 853 class ast_switch_statement : public ast_node {
 854 public:
 855    ast_switch_statement(ast_expression *test_expression,
 856                         ast_node *body);
 857    virtual void print(void) const;
 858
 859    virtual ir_rvalue *hir(exec_list *instructions,
 860                           struct _mesa_glsl_parse_state *state);
 861
 862    ast_expression *test_expression;
 863    ast_node *body;
 864
 865 protected:
 866    void test_to_hir(exec_list *, struct _mesa_glsl_parse_state *);
 867 };
 868
 869 class ast_iteration_statement : public ast_node {
 870 public:
 871    ast_iteration_statement(int mode, ast_node *init, ast_node *condition,
 872                            ast_expression *rest_expression, ast_node *body);
 873
 874    virtual void print(void) const;
 875
 876    virtual ir_rvalue *hir(exec_list *, struct _mesa_glsl_parse_state *);
 877
 878    enum ast_iteration_modes {
 879       ast_for,
 880       ast_while,
 881       ast_do_while
 882    } mode;
 883
 884
 885    ast_node *init_statement;
 886    ast_node *condition;
 887    ast_expression *rest_expression;
 888
 889    ast_node *body;
 890
 891    /**
 892     * Generate IR from the condition of a loop
 893     *
 894     * This is factored out of ::hir because some loops have the condition
 895     * test at the top (for and while), and others have it at the end (do-while).
 896     */
 897    void condition_to_hir(exec_list *, struct _mesa_glsl_parse_state *);
 898 };
 899
 900
 901 class ast_jump_statement : public ast_node {
 902 public:
 903    ast_jump_statement(int mode, ast_expression *return_value);
 904    virtual void print(void) const;
 905
 906    virtual ir_rvalue *hir(exec_list *instructions,
 907                           struct _mesa_glsl_parse_state *state);
 908
 909    enum ast_jump_modes {
 910       ast_continue,
 911       ast_break,
 912       ast_return,
 913       ast_discard
 914    } mode;
 915
 916    ast_expression *opt_return_value;
 917 };
 918
 919
 920 class ast_function_definition : public ast_node {
 921 public:
 922    ast_function_definition() : prototype(NULL), body(NULL)
 923    {
 924    }
 925
 926    virtual void print(void) const;
 927
 928    virtual ir_rvalue *hir(exec_list *instructions,
 929                           struct _mesa_glsl_parse_state *state);
 930
 931    ast_function *prototype;
 932    ast_compound_statement *body;
 933 };
 934
 935 class ast_interface_block : public ast_node {
 936 public:
 937    ast_interface_block(ast_type_qualifier layout,
 938                        const char *instance_name,
 939                        ast_array_specifier *array_specifier)
 940    : layout(layout), block_name(NULL), instance_name(instance_name),
 941      array_specifier(array_specifier)
 942    {
 943    }
 944
 945    virtual ir_rvalue *hir(exec_list *instructions,
 946                           struct _mesa_glsl_parse_state *state);
 947
 948    ast_type_qualifier layout;
 949    const char *block_name;
 950
 951    /**
 952     * Declared name of the block instance, if specified.
 953     *
 954     * If the block does not have an instance name, this field will be
 955     * \c NULL.
 956     */
 957    const char *instance_name;
 958
 959    /** List of ast_declarator_list * */
 960    exec_list declarations;
 961
 962    /**
 963     * Declared array size of the block instance
 964     *
 965     * If the block is not declared as an array or if the block instance array
 966     * is unsized, this field will be \c NULL.
 967     */
 968    ast_array_specifier *array_specifier;
 969 };
 970
 971
 972 /**
 973  * AST node representing a declaration of the input layout for geometry
 974  * shaders.
 975  */
 976 class ast_gs_input_layout : public ast_node
 977 {
 978 public:
 979    ast_gs_input_layout(const struct YYLTYPE &locp, GLenum prim_type)
 980       : prim_type(prim_type)
 981    {
 982       set_location(locp);
 983    }
 984
 985    virtual ir_rvalue *hir(exec_list *instructions,
 986                           struct _mesa_glsl_parse_state *state);
 987
 988 private:
 989    const GLenum prim_type;
 990 };
 991
 992 /*@}*/
 993
 994 extern void
 995 _mesa_ast_to_hir(exec_list *instructions, struct _mesa_glsl_parse_state *state);
 996
 997 extern ir_rvalue *
 998 _mesa_ast_field_selection_to_hir(const ast_expression *expr,
 999                                  exec_list *instructions,
1000                                  struct _mesa_glsl_parse_state *state);
1001
1002 extern ir_rvalue *
1003 _mesa_ast_array_index_to_hir(void *mem_ctx,
1004                              struct _mesa_glsl_parse_state *state,
1005                              ir_rvalue *array, ir_rvalue *idx,
1006                              YYLTYPE &loc, YYLTYPE &idx_loc);
1007
1008 extern void
1009 _mesa_ast_set_aggregate_type(const glsl_type *type,
1010                              ast_expression *expr);
1011
1012 void
1013 emit_function(_mesa_glsl_parse_state *state, ir_function *f);
1014
1015 extern void
1016 check_builtin_array_max_size(const char *name, unsigned size,
1017                              YYLTYPE loc, struct _mesa_glsl_parse_state *state);
1018
1019 #endif /* AST_H */