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    virtual void set_is_lhs(bool);
 130
 131 protected:
 132    /**
 133     * The only constructor is protected so that only derived class objects can
 134     * be created.
 135     */
 136    ast_node(void);
 137 };
 138
 139
 140 /**
 141  * Operators for AST expression nodes.
 142  */
 143 enum ast_operators {
 144    ast_assign,
 145    ast_plus,        /**< Unary + operator. */
 146    ast_neg,
 147    ast_add,
 148    ast_sub,
 149    ast_mul,
 150    ast_div,
 151    ast_mod,
 152    ast_lshift,
 153    ast_rshift,
 154    ast_less,
 155    ast_greater,
 156    ast_lequal,
 157    ast_gequal,
 158    ast_equal,
 159    ast_nequal,
 160    ast_bit_and,
 161    ast_bit_xor,
 162    ast_bit_or,
 163    ast_bit_not,
 164    ast_logic_and,
 165    ast_logic_xor,
 166    ast_logic_or,
 167    ast_logic_not,
 168
 169    ast_mul_assign,
 170    ast_div_assign,
 171    ast_mod_assign,
 172    ast_add_assign,
 173    ast_sub_assign,
 174    ast_ls_assign,
 175    ast_rs_assign,
 176    ast_and_assign,
 177    ast_xor_assign,
 178    ast_or_assign,
 179
 180    ast_conditional,
 181
 182    ast_pre_inc,
 183    ast_pre_dec,
 184    ast_post_inc,
 185    ast_post_dec,
 186    ast_field_selection,
 187    ast_array_index,
 188    ast_unsized_array_dim,
 189
 190    ast_function_call,
 191
 192    ast_identifier,
 193    ast_int_constant,
 194    ast_uint_constant,
 195    ast_float_constant,
 196    ast_bool_constant,
 197    ast_double_constant,
 198
 199    ast_sequence,
 200    ast_aggregate
 201 };
 202
 203 /**
 204  * Representation of any sort of expression.
 205  */
 206 class ast_expression : public ast_node {
 207 public:
 208    ast_expression(int oper, ast_expression *,
 209                   ast_expression *, ast_expression *);
 210
 211    ast_expression(const char *identifier) :
 212       oper(ast_identifier)
 213    {
 214       subexpressions[0] = NULL;
 215       subexpressions[1] = NULL;
 216       subexpressions[2] = NULL;
 217       primary_expression.identifier = identifier;
 218       this->non_lvalue_description = NULL;
 219       this->is_lhs = false;
 220    }
 221
 222    static const char *operator_string(enum ast_operators op);
 223
 224    virtual ir_rvalue *hir(exec_list *instructions,
 225                           struct _mesa_glsl_parse_state *state);
 226
 227    virtual void hir_no_rvalue(exec_list *instructions,
 228                               struct _mesa_glsl_parse_state *state);
 229
 230    virtual bool has_sequence_subexpression() const;
 231
 232    ir_rvalue *do_hir(exec_list *instructions,
 233                      struct _mesa_glsl_parse_state *state,
 234                      bool needs_rvalue);
 235
 236    virtual void print(void) const;
 237
 238    enum ast_operators oper;
 239
 240    ast_expression *subexpressions[3];
 241
 242    union {
 243       const char *identifier;
 244       int int_constant;
 245       float float_constant;
 246       unsigned uint_constant;
 247       int bool_constant;
 248       double double_constant;
 249    } primary_expression;
 250
 251
 252    /**
 253     * List of expressions for an \c ast_sequence or parameters for an
 254     * \c ast_function_call
 255     */
 256    exec_list expressions;
 257
 258    /**
 259     * For things that can't be l-values, this describes what it is.
 260     *
 261     * This text is used by the code that generates IR for assignments to
 262     * detect and emit useful messages for assignments to some things that
 263     * can't be l-values.  For example, pre- or post-incerement expressions.
 264     *
 265     * \note
 266     * This pointer may be \c NULL.
 267     */
 268    const char *non_lvalue_description;
 269
 270    void set_is_lhs(bool new_value);
 271
 272 private:
 273    bool is_lhs;
 274 };
 275
 276 class ast_expression_bin : public ast_expression {
 277 public:
 278    ast_expression_bin(int oper, ast_expression *, ast_expression *);
 279
 280    virtual void print(void) const;
 281 };
 282
 283 /**
 284  * Subclass of expressions for function calls
 285  */
 286 class ast_function_expression : public ast_expression {
 287 public:
 288    ast_function_expression(ast_expression *callee)
 289       : ast_expression(ast_function_call, callee,
 290                        NULL, NULL),
 291         cons(false)
 292    {
 293       /* empty */
 294    }
 295
 296    ast_function_expression(class ast_type_specifier *type)
 297       : ast_expression(ast_function_call, (ast_expression *) type,
 298                        NULL, NULL),
 299         cons(true)
 300    {
 301       /* empty */
 302    }
 303
 304    bool is_constructor() const
 305    {
 306       return cons;
 307    }
 308
 309    virtual ir_rvalue *hir(exec_list *instructions,
 310                           struct _mesa_glsl_parse_state *state);
 311
 312    virtual void hir_no_rvalue(exec_list *instructions,
 313                               struct _mesa_glsl_parse_state *state);
 314
 315    virtual bool has_sequence_subexpression() const;
 316
 317 private:
 318    /**
 319     * Is this function call actually a constructor?
 320     */
 321    bool cons;
 322    ir_rvalue *
 323    handle_method(exec_list *instructions,
 324                  struct _mesa_glsl_parse_state *state);
 325 };
 326
 327 class ast_subroutine_list : public ast_node
 328 {
 329 public:
 330    virtual void print(void) const;
 331    exec_list declarations;
 332 };
 333
 334 class ast_array_specifier : public ast_node {
 335 public:
 336    ast_array_specifier(const struct YYLTYPE &locp, ast_expression *dim)
 337    {
 338       set_location(locp);
 339       array_dimensions.push_tail(&dim->link);
 340    }
 341
 342    void add_dimension(ast_expression *dim)
 343    {
 344       array_dimensions.push_tail(&dim->link);
 345    }
 346
 347    bool is_single_dimension() const
 348    {
 349       return this->array_dimensions.get_tail_raw()->prev != NULL &&
 350              this->array_dimensions.get_tail_raw()->prev->is_head_sentinel();
 351    }
 352
 353    virtual void print(void) const;
 354
 355    /* This list contains objects of type ast_node containing the
 356     * array dimensions in outermost-to-innermost order.
 357     */
 358    exec_list array_dimensions;
 359 };
 360
 361 class ast_layout_expression : public ast_node {
 362 public:
 363    ast_layout_expression(const struct YYLTYPE &locp, ast_expression *expr)
 364    {
 365       set_location(locp);
 366       layout_const_expressions.push_tail(&expr->link);
 367    }
 368
 369    bool process_qualifier_constant(struct _mesa_glsl_parse_state *state,
 370                                    const char *qual_indentifier,
 371                                    unsigned *value, bool can_be_zero,
 372                                    bool must_match = false);
 373
 374    void merge_qualifier(ast_layout_expression *l_expr)
 375    {
 376       layout_const_expressions.append_list(&l_expr->layout_const_expressions);
 377    }
 378
 379    exec_list layout_const_expressions;
 380 };
 381
 382 /**
 383  * C-style aggregate initialization class
 384  *
 385  * Represents C-style initializers of vectors, matrices, arrays, and
 386  * structures. E.g., vec3 pos = {1.0, 0.0, -1.0} is equivalent to
 387  * vec3 pos = vec3(1.0, 0.0, -1.0).
 388  *
 389  * Specified in GLSL 4.20 and GL_ARB_shading_language_420pack.
 390  *
 391  * \sa _mesa_ast_set_aggregate_type
 392  */
 393 class ast_aggregate_initializer : public ast_expression {
 394 public:
 395    ast_aggregate_initializer()
 396       : ast_expression(ast_aggregate, NULL, NULL, NULL),
 397         constructor_type(NULL)
 398    {
 399       /* empty */
 400    }
 401
 402    /**
 403     * glsl_type of the aggregate, which is inferred from the LHS of whatever
 404     * the aggregate is being used to initialize.  This can't be inferred at
 405     * parse time (since the parser deals with ast_type_specifiers, not
 406     * glsl_types), so the parser leaves it NULL.  However, the ast-to-hir
 407     * conversion code makes sure to fill it in with the appropriate type
 408     * before hir() is called.
 409     */
 410    const glsl_type *constructor_type;
 411
 412    virtual ir_rvalue *hir(exec_list *instructions,
 413                           struct _mesa_glsl_parse_state *state);
 414
 415    virtual void hir_no_rvalue(exec_list *instructions,
 416                               struct _mesa_glsl_parse_state *state);
 417 };
 418
 419 /**
 420  * Number of possible operators for an ast_expression
 421  *
 422  * This is done as a define instead of as an additional value in the enum so
 423  * that the compiler won't generate spurious messages like "warning:
 424  * enumeration value ‘ast_num_operators’ not handled in switch"
 425  */
 426 #define AST_NUM_OPERATORS (ast_sequence + 1)
 427
 428
 429 class ast_compound_statement : public ast_node {
 430 public:
 431    ast_compound_statement(int new_scope, ast_node *statements);
 432    virtual void print(void) const;
 433
 434    virtual ir_rvalue *hir(exec_list *instructions,
 435                           struct _mesa_glsl_parse_state *state);
 436
 437    int new_scope;
 438    exec_list statements;
 439 };
 440
 441 class ast_declaration : public ast_node {
 442 public:
 443    ast_declaration(const char *identifier,
 444                    ast_array_specifier *array_specifier,
 445                    ast_expression *initializer);
 446    virtual void print(void) const;
 447
 448    const char *identifier;
 449
 450    ast_array_specifier *array_specifier;
 451
 452    ast_expression *initializer;
 453 };
 454
 455
 456 enum {
 457    ast_precision_none = 0, /**< Absence of precision qualifier. */
 458    ast_precision_high,
 459    ast_precision_medium,
 460    ast_precision_low
 461 };
 462
 463 struct ast_type_qualifier {
 464    DECLARE_RALLOC_CXX_OPERATORS(ast_type_qualifier);
 465
 466    union {
 467       struct {
 468          unsigned invariant:1;
 469          unsigned precise:1;
 470          unsigned constant:1;
 471          unsigned attribute:1;
 472          unsigned varying:1;
 473          unsigned in:1;
 474          unsigned out:1;
 475          unsigned centroid:1;
 476          unsigned sample:1;
 477          unsigned patch:1;
 478          unsigned uniform:1;
 479          unsigned buffer:1;
 480          unsigned shared_storage:1;
 481          unsigned smooth:1;
 482          unsigned flat:1;
 483          unsigned noperspective:1;
 484
 485          /** \name Layout qualifiers for GL_ARB_fragment_coord_conventions */
 486          /*@{*/
 487          unsigned origin_upper_left:1;
 488          unsigned pixel_center_integer:1;
 489          /*@}*/
 490
 491          /**
 492           * Flag set if GL_ARB_enhanced_layouts "align" layout qualifier is
 493           * used.
 494           */
 495          unsigned explicit_align:1;
 496
 497          /**
 498           * Flag set if GL_ARB_explicit_attrib_location "location" layout
 499           * qualifier is used.
 500           */
 501          unsigned explicit_location:1;
 502          /**
 503           * Flag set if GL_ARB_explicit_attrib_location "index" layout
 504           * qualifier is used.
 505           */
 506          unsigned explicit_index:1;
 507
 508          /**
 509           * Flag set if GL_ARB_enhanced_layouts "component" layout
 510           * qualifier is used.
 511           */
 512          unsigned explicit_component:1;
 513
 514          /**
 515           * Flag set if GL_ARB_shading_language_420pack "binding" layout
 516           * qualifier is used.
 517           */
 518          unsigned explicit_binding:1;
 519
 520          /**
 521           * Flag set if GL_ARB_shader_atomic counter "offset" layout
 522           * qualifier is used.
 523           */
 524          unsigned explicit_offset:1;
 525
 526          /** \name Layout qualifiers for GL_AMD_conservative_depth */
 527          /** \{ */
 528          unsigned depth_any:1;
 529          unsigned depth_greater:1;
 530          unsigned depth_less:1;
 531          unsigned depth_unchanged:1;
 532          /** \} */
 533
 534          /** \name Layout qualifiers for GL_ARB_uniform_buffer_object */
 535          /** \{ */
 536          unsigned std140:1;
 537          unsigned std430:1;
 538          unsigned shared:1;
 539          unsigned packed:1;
 540          unsigned column_major:1;
 541          unsigned row_major:1;
 542          /** \} */
 543
 544          /** \name Layout qualifiers for GLSL 1.50 geometry shaders */
 545          /** \{ */
 546          unsigned prim_type:1;
 547          unsigned max_vertices:1;
 548          /** \} */
 549
 550          /**
 551           * local_size_{x,y,z} flags for compute shaders.  Bit 0 represents
 552           * local_size_x, and so on.
 553           */
 554          unsigned local_size:3;
 555
 556          /** \name Layout and memory qualifiers for ARB_shader_image_load_store. */
 557          /** \{ */
 558          unsigned early_fragment_tests:1;
 559          unsigned explicit_image_format:1;
 560          unsigned coherent:1;
 561          unsigned _volatile:1;
 562          unsigned restrict_flag:1;
 563          unsigned read_only:1; /**< "readonly" qualifier. */
 564          unsigned write_only:1; /**< "writeonly" qualifier. */
 565          /** \} */
 566
 567          /** \name Layout qualifiers for GL_ARB_gpu_shader5 */
 568          /** \{ */
 569          unsigned invocations:1;
 570          unsigned stream:1; /**< Has stream value assigned  */
 571          unsigned explicit_stream:1; /**< stream value assigned explicitly by shader code */
 572          /** \} */
 573
 574          /** \name Layout qualifiers for GL_ARB_enhanced_layouts */
 575          /** \{ */
 576          unsigned explicit_xfb_offset:1; /**< xfb_offset value assigned explicitly by shader code */
 577          unsigned xfb_buffer:1; /**< Has xfb_buffer value assigned  */
 578          unsigned explicit_xfb_buffer:1; /**< xfb_buffer value assigned explicitly by shader code */
 579          unsigned xfb_stride:1; /**< Is xfb_stride value yet to be merged with global values  */
 580          unsigned explicit_xfb_stride:1; /**< xfb_stride value assigned explicitly by shader code */
 581          /** \} */
 582
 583          /** \name Layout qualifiers for GL_ARB_tessellation_shader */
 584          /** \{ */
 585          /* tess eval input layout */
 586          /* gs prim_type reused for primitive mode */
 587          unsigned vertex_spacing:1;
 588          unsigned ordering:1;
 589          unsigned point_mode:1;
 590          /* tess control output layout */
 591          unsigned vertices:1;
 592          /** \} */
 593
 594          /** \name Qualifiers for GL_ARB_shader_subroutine */
 595          /** \{ */
 596          unsigned subroutine:1;  /**< Is this marked 'subroutine' */
 597          unsigned subroutine_def:1; /**< Is this marked 'subroutine' with a list of types */
 598          /** \} */
 599       }
 600       /** \brief Set of flags, accessed by name. */
 601       q;
 602
 603       /** \brief Set of flags, accessed as a bitmask. */
 604       uint64_t i;
 605    } flags;
 606
 607    /** Precision of the type (highp/medium/lowp). */
 608    unsigned precision:2;
 609
 610    /**
 611     * Alignment specified via GL_ARB_enhanced_layouts "align" layout qualifier
 612     */
 613    ast_expression *align;
 614
 615    /** Geometry shader invocations for GL_ARB_gpu_shader5. */
 616    ast_layout_expression *invocations;
 617
 618    /**
 619     * Location specified via GL_ARB_explicit_attrib_location layout
 620     *
 621     * \note
 622     * This field is only valid if \c explicit_location is set.
 623     */
 624    ast_expression *location;
 625    /**
 626     * Index specified via GL_ARB_explicit_attrib_location layout
 627     *
 628     * \note
 629     * This field is only valid if \c explicit_index is set.
 630     */
 631    ast_expression *index;
 632
 633    /**
 634     * Component specified via GL_ARB_enhaced_layouts
 635     *
 636     * \note
 637     * This field is only valid if \c explicit_component is set.
 638     */
 639    ast_expression *component;
 640
 641    /** Maximum output vertices in GLSL 1.50 geometry shaders. */
 642    ast_layout_expression *max_vertices;
 643
 644    /** Stream in GLSL 1.50 geometry shaders. */
 645    ast_expression *stream;
 646
 647    /** xfb_buffer specified via the GL_ARB_enhanced_layouts keyword. */
 648    ast_expression *xfb_buffer;
 649
 650    /** xfb_stride specified via the GL_ARB_enhanced_layouts keyword. */
 651    ast_expression *xfb_stride;
 652
 653    /** global xfb_stride values for each buffer */
 654    ast_layout_expression *out_xfb_stride[MAX_FEEDBACK_BUFFERS];
 655
 656    /**
 657     * Input or output primitive type in GLSL 1.50 geometry shaders
 658     * and tessellation shaders.
 659     */
 660    GLenum prim_type;
 661
 662    /**
 663     * Binding specified via GL_ARB_shading_language_420pack's "binding" keyword.
 664     *
 665     * \note
 666     * This field is only valid if \c explicit_binding is set.
 667     */
 668    ast_expression *binding;
 669
 670    /**
 671     * Offset specified via GL_ARB_shader_atomic_counter's or
 672     * GL_ARB_enhanced_layouts "offset" keyword, or by GL_ARB_enhanced_layouts
 673     * "xfb_offset" keyword.
 674     *
 675     * \note
 676     * This field is only valid if \c explicit_offset is set.
 677     */
 678    ast_expression *offset;
 679
 680    /**
 681     * Local size specified via GL_ARB_compute_shader's "local_size_{x,y,z}"
 682     * layout qualifier.  Element i of this array is only valid if
 683     * flags.q.local_size & (1 << i) is set.
 684     */
 685    ast_layout_expression *local_size[3];
 686
 687    /** Tessellation evaluation shader: vertex spacing (equal, fractional even/odd) */
 688    GLenum vertex_spacing;
 689
 690    /** Tessellation evaluation shader: vertex ordering (CW or CCW) */
 691    GLenum ordering;
 692
 693    /** Tessellation evaluation shader: point mode */
 694    bool point_mode;
 695
 696    /** Tessellation control shader: number of output vertices */
 697    ast_layout_expression *vertices;
 698
 699    /**
 700     * Image format specified with an ARB_shader_image_load_store
 701     * layout qualifier.
 702     *
 703     * \note
 704     * This field is only valid if \c explicit_image_format is set.
 705     */
 706    GLenum image_format;
 707
 708    /**
 709     * Base type of the data read from or written to this image.  Only
 710     * the following enumerants are allowed: GLSL_TYPE_UINT,
 711     * GLSL_TYPE_INT, GLSL_TYPE_FLOAT.
 712     *
 713     * \note
 714     * This field is only valid if \c explicit_image_format is set.
 715     */
 716    glsl_base_type image_base_type;
 717
 718    /** Flag to know if this represents a default value for a qualifier */
 719    bool is_default_qualifier;
 720
 721    /**
 722     * Return true if and only if an interpolation qualifier is present.
 723     */
 724    bool has_interpolation() const;
 725
 726    /**
 727     * Return whether a layout qualifier is present.
 728     */
 729    bool has_layout() const;
 730
 731    /**
 732     * Return whether a storage qualifier is present.
 733     */
 734    bool has_storage() const;
 735
 736    /**
 737     * Return whether an auxiliary storage qualifier is present.
 738     */
 739    bool has_auxiliary_storage() const;
 740
 741    bool merge_qualifier(YYLTYPE *loc,
 742                         _mesa_glsl_parse_state *state,
 743                         const ast_type_qualifier &q,
 744                         bool is_single_layout_merge);
 745
 746    bool merge_out_qualifier(YYLTYPE *loc,
 747                            _mesa_glsl_parse_state *state,
 748                            const ast_type_qualifier &q,
 749                            ast_node* &node, bool create_node);
 750
 751    bool merge_in_qualifier(YYLTYPE *loc,
 752                            _mesa_glsl_parse_state *state,
 753                            const ast_type_qualifier &q,
 754                            ast_node* &node, bool create_node);
 755
 756    bool validate_flags(YYLTYPE *loc,
 757                        _mesa_glsl_parse_state *state,
 758                        const char *message,
 759                        const ast_type_qualifier &allowed_flags);
 760
 761    ast_subroutine_list *subroutine_list;
 762 };
 763
 764 class ast_declarator_list;
 765
 766 class ast_struct_specifier : public ast_node {
 767 public:
 768    ast_struct_specifier(const char *identifier,
 769                         ast_declarator_list *declarator_list);
 770    virtual void print(void) const;
 771
 772    virtual ir_rvalue *hir(exec_list *instructions,
 773                           struct _mesa_glsl_parse_state *state);
 774
 775    const char *name;
 776    ast_type_qualifier *layout;
 777    /* List of ast_declarator_list * */
 778    exec_list declarations;
 779    bool is_declaration;
 780 };
 781
 782
 783
 784 class ast_type_specifier : public ast_node {
 785 public:
 786    /** Construct a type specifier from a type name */
 787    ast_type_specifier(const char *name)
 788       : type_name(name), structure(NULL), array_specifier(NULL),
 789         default_precision(ast_precision_none)
 790    {
 791       /* empty */
 792    }
 793
 794    /** Construct a type specifier from a structure definition */
 795    ast_type_specifier(ast_struct_specifier *s)
 796       : type_name(s->name), structure(s), array_specifier(NULL),
 797         default_precision(ast_precision_none)
 798    {
 799       /* empty */
 800    }
 801
 802    const struct glsl_type *glsl_type(const char **name,
 803                                      struct _mesa_glsl_parse_state *state)
 804       const;
 805
 806    virtual void print(void) const;
 807
 808    ir_rvalue *hir(exec_list *, struct _mesa_glsl_parse_state *);
 809
 810    const char *type_name;
 811    ast_struct_specifier *structure;
 812
 813    ast_array_specifier *array_specifier;
 814
 815    /** For precision statements, this is the given precision; otherwise none. */
 816    unsigned default_precision:2;
 817 };
 818
 819
 820 class ast_fully_specified_type : public ast_node {
 821 public:
 822    virtual void print(void) const;
 823    bool has_qualifiers(_mesa_glsl_parse_state *state) const;
 824
 825    ast_fully_specified_type() : qualifier(), specifier(NULL)
 826    {
 827    }
 828
 829    const struct glsl_type *glsl_type(const char **name,
 830                                      struct _mesa_glsl_parse_state *state)
 831       const;
 832
 833    ast_type_qualifier qualifier;
 834    ast_type_specifier *specifier;
 835 };
 836
 837
 838 class ast_declarator_list : public ast_node {
 839 public:
 840    ast_declarator_list(ast_fully_specified_type *);
 841    virtual void print(void) const;
 842
 843    virtual ir_rvalue *hir(exec_list *instructions,
 844                           struct _mesa_glsl_parse_state *state);
 845
 846    ast_fully_specified_type *type;
 847    /** List of 'ast_declaration *' */
 848    exec_list declarations;
 849
 850    /**
 851     * Flags for redeclarations. In these cases, no type is specified, to
 852     * `type` is allowed to be NULL. In all other cases, this would be an error.
 853     */
 854    int invariant;     /** < `invariant` redeclaration */
 855    int precise;       /** < `precise` redeclaration */
 856 };
 857
 858
 859 class ast_parameter_declarator : public ast_node {
 860 public:
 861    ast_parameter_declarator() :
 862       type(NULL),
 863       identifier(NULL),
 864       array_specifier(NULL),
 865       formal_parameter(false),
 866       is_void(false)
 867    {
 868       /* empty */
 869    }
 870
 871    virtual void print(void) const;
 872
 873    virtual ir_rvalue *hir(exec_list *instructions,
 874                           struct _mesa_glsl_parse_state *state);
 875
 876    ast_fully_specified_type *type;
 877    const char *identifier;
 878    ast_array_specifier *array_specifier;
 879
 880    static void parameters_to_hir(exec_list *ast_parameters,
 881                                  bool formal, exec_list *ir_parameters,
 882                                  struct _mesa_glsl_parse_state *state);
 883
 884 private:
 885    /** Is this parameter declaration part of a formal parameter list? */
 886    bool formal_parameter;
 887
 888    /**
 889     * Is this parameter 'void' type?
 890     *
 891     * This field is set by \c ::hir.
 892     */
 893    bool is_void;
 894 };
 895
 896
 897 class ast_function : public ast_node {
 898 public:
 899    ast_function(void);
 900
 901    virtual void print(void) const;
 902
 903    virtual ir_rvalue *hir(exec_list *instructions,
 904                           struct _mesa_glsl_parse_state *state);
 905
 906    ast_fully_specified_type *return_type;
 907    const char *identifier;
 908
 909    exec_list parameters;
 910
 911 private:
 912    /**
 913     * Is this prototype part of the function definition?
 914     *
 915     * Used by ast_function_definition::hir to process the parameters, etc.
 916     * of the function.
 917     *
 918     * \sa ::hir
 919     */
 920    bool is_definition;
 921
 922    /**
 923     * Function signature corresponding to this function prototype instance
 924     *
 925     * Used by ast_function_definition::hir to process the parameters, etc.
 926     * of the function.
 927     *
 928     * \sa ::hir
 929     */
 930    class ir_function_signature *signature;
 931
 932    friend class ast_function_definition;
 933 };
 934
 935
 936 class ast_expression_statement : public ast_node {
 937 public:
 938    ast_expression_statement(ast_expression *);
 939    virtual void print(void) const;
 940
 941    virtual ir_rvalue *hir(exec_list *instructions,
 942                           struct _mesa_glsl_parse_state *state);
 943
 944    ast_expression *expression;
 945 };
 946
 947
 948 class ast_case_label : public ast_node {
 949 public:
 950    ast_case_label(ast_expression *test_value);
 951    virtual void print(void) const;
 952
 953    virtual ir_rvalue *hir(exec_list *instructions,
 954                           struct _mesa_glsl_parse_state *state);
 955
 956    /**
 957     * An test value of NULL means 'default'.
 958     */
 959    ast_expression *test_value;
 960 };
 961
 962
 963 class ast_case_label_list : public ast_node {
 964 public:
 965    ast_case_label_list(void);
 966    virtual void print(void) const;
 967
 968    virtual ir_rvalue *hir(exec_list *instructions,
 969                           struct _mesa_glsl_parse_state *state);
 970
 971    /**
 972     * A list of case labels.
 973     */
 974    exec_list labels;
 975 };
 976
 977
 978 class ast_case_statement : public ast_node {
 979 public:
 980    ast_case_statement(ast_case_label_list *labels);
 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_case_label_list *labels;
 987
 988    /**
 989     * A list of statements.
 990     */
 991    exec_list stmts;
 992 };
 993
 994
 995 class ast_case_statement_list : public ast_node {
 996 public:
 997    ast_case_statement_list(void);
 998    virtual void print(void) const;
 999
1000    virtual ir_rvalue *hir(exec_list *instructions,
1001                           struct _mesa_glsl_parse_state *state);
1002
1003    /**
1004     * A list of cases.
1005     */
1006    exec_list cases;
1007 };
1008
1009
1010 class ast_switch_body : public ast_node {
1011 public:
1012    ast_switch_body(ast_case_statement_list *stmts);
1013    virtual void print(void) const;
1014
1015    virtual ir_rvalue *hir(exec_list *instructions,
1016                           struct _mesa_glsl_parse_state *state);
1017
1018    ast_case_statement_list *stmts;
1019 };
1020
1021
1022 class ast_selection_statement : public ast_node {
1023 public:
1024    ast_selection_statement(ast_expression *condition,
1025                            ast_node *then_statement,
1026                            ast_node *else_statement);
1027    virtual void print(void) const;
1028
1029    virtual ir_rvalue *hir(exec_list *instructions,
1030                           struct _mesa_glsl_parse_state *state);
1031
1032    ast_expression *condition;
1033    ast_node *then_statement;
1034    ast_node *else_statement;
1035 };
1036
1037
1038 class ast_switch_statement : public ast_node {
1039 public:
1040    ast_switch_statement(ast_expression *test_expression,
1041                         ast_node *body);
1042    virtual void print(void) const;
1043
1044    virtual ir_rvalue *hir(exec_list *instructions,
1045                           struct _mesa_glsl_parse_state *state);
1046
1047    ast_expression *test_expression;
1048    ast_node *body;
1049
1050 protected:
1051    void test_to_hir(exec_list *, struct _mesa_glsl_parse_state *);
1052 };
1053
1054 class ast_iteration_statement : public ast_node {
1055 public:
1056    ast_iteration_statement(int mode, ast_node *init, ast_node *condition,
1057                            ast_expression *rest_expression, ast_node *body);
1058
1059    virtual void print(void) const;
1060
1061    virtual ir_rvalue *hir(exec_list *, struct _mesa_glsl_parse_state *);
1062
1063    enum ast_iteration_modes {
1064       ast_for,
1065       ast_while,
1066       ast_do_while
1067    } mode;
1068
1069
1070    ast_node *init_statement;
1071    ast_node *condition;
1072    ast_expression *rest_expression;
1073
1074    ast_node *body;
1075
1076    /**
1077     * Generate IR from the condition of a loop
1078     *
1079     * This is factored out of ::hir because some loops have the condition
1080     * test at the top (for and while), and others have it at the end (do-while).
1081     */
1082    void condition_to_hir(exec_list *, struct _mesa_glsl_parse_state *);
1083 };
1084
1085
1086 class ast_jump_statement : public ast_node {
1087 public:
1088    ast_jump_statement(int mode, ast_expression *return_value);
1089    virtual void print(void) const;
1090
1091    virtual ir_rvalue *hir(exec_list *instructions,
1092                           struct _mesa_glsl_parse_state *state);
1093
1094    enum ast_jump_modes {
1095       ast_continue,
1096       ast_break,
1097       ast_return,
1098       ast_discard
1099    } mode;
1100
1101    ast_expression *opt_return_value;
1102 };
1103
1104
1105 class ast_function_definition : public ast_node {
1106 public:
1107    ast_function_definition() : prototype(NULL), body(NULL)
1108    {
1109    }
1110
1111    virtual void print(void) const;
1112
1113    virtual ir_rvalue *hir(exec_list *instructions,
1114                           struct _mesa_glsl_parse_state *state);
1115
1116    ast_function *prototype;
1117    ast_compound_statement *body;
1118 };
1119
1120 class ast_interface_block : public ast_node {
1121 public:
1122    ast_interface_block(const char *instance_name,
1123                        ast_array_specifier *array_specifier)
1124    : block_name(NULL), instance_name(instance_name),
1125      array_specifier(array_specifier)
1126    {
1127    }
1128
1129    virtual ir_rvalue *hir(exec_list *instructions,
1130                           struct _mesa_glsl_parse_state *state);
1131
1132    ast_type_qualifier layout;
1133    const char *block_name;
1134
1135    /**
1136     * Declared name of the block instance, if specified.
1137     *
1138     * If the block does not have an instance name, this field will be
1139     * \c NULL.
1140     */
1141    const char *instance_name;
1142
1143    /** List of ast_declarator_list * */
1144    exec_list declarations;
1145
1146    /**
1147     * Declared array size of the block instance
1148     *
1149     * If the block is not declared as an array or if the block instance array
1150     * is unsized, this field will be \c NULL.
1151     */
1152    ast_array_specifier *array_specifier;
1153 };
1154
1155
1156 /**
1157  * AST node representing a declaration of the output layout for tessellation
1158  * control shaders.
1159  */
1160 class ast_tcs_output_layout : public ast_node
1161 {
1162 public:
1163    ast_tcs_output_layout(const struct YYLTYPE &locp)
1164    {
1165       set_location(locp);
1166    }
1167
1168    virtual ir_rvalue *hir(exec_list *instructions,
1169                           struct _mesa_glsl_parse_state *state);
1170 };
1171
1172
1173 /**
1174  * AST node representing a declaration of the input layout for geometry
1175  * shaders.
1176  */
1177 class ast_gs_input_layout : public ast_node
1178 {
1179 public:
1180    ast_gs_input_layout(const struct YYLTYPE &locp, GLenum prim_type)
1181       : prim_type(prim_type)
1182    {
1183       set_location(locp);
1184    }
1185
1186    virtual ir_rvalue *hir(exec_list *instructions,
1187                           struct _mesa_glsl_parse_state *state);
1188
1189 private:
1190    const GLenum prim_type;
1191 };
1192
1193
1194 /**
1195  * AST node representing a decalaration of the input layout for compute
1196  * shaders.
1197  */
1198 class ast_cs_input_layout : public ast_node
1199 {
1200 public:
1201    ast_cs_input_layout(const struct YYLTYPE &locp,
1202                        ast_layout_expression *const *local_size)
1203    {
1204       for (int i = 0; i < 3; i++) {
1205          this->local_size[i] = local_size[i];
1206       }
1207       set_location(locp);
1208    }
1209
1210    virtual ir_rvalue *hir(exec_list *instructions,
1211                           struct _mesa_glsl_parse_state *state);
1212
1213 private:
1214    ast_layout_expression *local_size[3];
1215 };
1216
1217 /*@}*/
1218
1219 extern void
1220 _mesa_ast_to_hir(exec_list *instructions, struct _mesa_glsl_parse_state *state);
1221
1222 extern ir_rvalue *
1223 _mesa_ast_field_selection_to_hir(const ast_expression *expr,
1224                                  exec_list *instructions,
1225                                  struct _mesa_glsl_parse_state *state);
1226
1227 extern ir_rvalue *
1228 _mesa_ast_array_index_to_hir(void *mem_ctx,
1229                              struct _mesa_glsl_parse_state *state,
1230                              ir_rvalue *array, ir_rvalue *idx,
1231                              YYLTYPE &loc, YYLTYPE &idx_loc);
1232
1233 extern void
1234 _mesa_ast_set_aggregate_type(const glsl_type *type,
1235                              ast_expression *expr);
1236
1237 void
1238 emit_function(_mesa_glsl_parse_state *state, ir_function *f);
1239
1240 extern void
1241 check_builtin_array_max_size(const char *name, unsigned size,
1242                              YYLTYPE loc, struct _mesa_glsl_parse_state *state);
1243
1244 extern void _mesa_ast_process_interface_block(YYLTYPE *locp,
1245                                               _mesa_glsl_parse_state *state,
1246                                               ast_interface_block *const block,
1247                                               const struct ast_type_qualifier &q);
1248
1249 extern bool
1250 process_qualifier_constant(struct _mesa_glsl_parse_state *state,
1251                            YYLTYPE *loc,
1252                            const char *qual_indentifier,
1253                            ast_expression *const_expression,
1254                            unsigned *value);
1255 #endif /* AST_H */