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 #ifndef AST_H
  26 #define AST_H
  27
  28 #include "list.h"
  29 #include "glsl_parser_extras.h"
  30 #include "compiler/glsl_types.h"
  31 #include "util/bitset.h"
  32
  33 struct _mesa_glsl_parse_state;
  34
  35 struct YYLTYPE;
  36
  37 /**
  38  * \defgroup AST Abstract syntax tree node definitions
  39  *
  40  * An abstract syntax tree is generated by the parser.  This is a fairly
  41  * direct representation of the gramma derivation for the source program.
  42  * No symantic checking is done during the generation of the AST.  Only
  43  * syntactic checking is done.  Symantic checking is performed by a later
  44  * stage that converts the AST to a more generic intermediate representation.
  45  *
  46  *@{
  47  */
  48 /**
  49  * Base class of all abstract syntax tree nodes
  50  */
  51 class ast_node {
  52 public:
  53    DECLARE_LINEAR_ZALLOC_CXX_OPERATORS(ast_node);
  54
  55    /**
  56     * Print an AST node in something approximating the original GLSL code
  57     */
  58    virtual void print(void) const;
  59
  60    /**
  61     * Convert the AST node to the high-level intermediate representation
  62     */
  63    virtual ir_rvalue *hir(exec_list *instructions,
  64                           struct _mesa_glsl_parse_state *state);
  65
  66    virtual bool has_sequence_subexpression() const;
  67
  68    /**
  69     * Retrieve the source location of an AST node
  70     *
  71     * This function is primarily used to get the source position of an AST node
  72     * into a form that can be passed to \c _mesa_glsl_error.
  73     *
  74     * \sa _mesa_glsl_error, ast_node::set_location
  75     */
  76    struct YYLTYPE get_location(void) const
  77    {
  78       struct YYLTYPE locp;
  79
  80       locp.path = this->location.path;
  81       locp.source = this->location.source;
  82       locp.first_line = this->location.first_line;
  83       locp.first_column = this->location.first_column;
  84       locp.last_line = this->location.last_line;
  85       locp.last_column = this->location.last_column;
  86
  87       return locp;
  88    }
  89
  90    /**
  91     * Set the source location of an AST node from a parser location
  92     *
  93     * \sa ast_node::get_location
  94     */
  95    void set_location(const struct YYLTYPE &locp)
  96    {
  97       this->location.path = locp.path;
  98       this->location.source = locp.source;
  99       this->location.first_line = locp.first_line;
 100       this->location.first_column = locp.first_column;
 101       this->location.last_line = locp.last_line;
 102       this->location.last_column = locp.last_column;
 103    }
 104
 105    /**
 106     * Set the source location range of an AST node using two location nodes
 107     *
 108     * \sa ast_node::set_location
 109     */
 110    void set_location_range(const struct YYLTYPE &begin, const struct YYLTYPE &end)
 111    {
 112       this->location.path = begin.path;
 113       this->location.source = begin.source;
 114       this->location.first_line = begin.first_line;
 115       this->location.last_line = end.last_line;
 116       this->location.first_column = begin.first_column;
 117       this->location.last_column = end.last_column;
 118    }
 119
 120    /**
 121     * Source location of the AST node.
 122     */
 123    struct {
 124       char *path;               /**< GLSL shader include path. */
 125       unsigned source;          /**< GLSL source number. */
 126       unsigned first_line;      /**< First line number within the source string. */
 127       unsigned first_column;    /**< First column in the first line. */
 128       unsigned last_line;       /**< Last line number within the source string. */
 129       unsigned last_column;     /**< Last column in the last line. */
 130    } location;
 131
 132    exec_node link;
 133
 134    virtual void set_is_lhs(bool);
 135
 136 protected:
 137    /**
 138     * The only constructor is protected so that only derived class objects can
 139     * be created.
 140     */
 141    ast_node(void);
 142 };
 143
 144
 145 /**
 146  * Operators for AST expression nodes.
 147  */
 148 enum ast_operators {
 149    ast_assign,
 150    ast_plus,        /**< Unary + operator. */
 151    ast_neg,
 152    ast_add,
 153    ast_sub,
 154    ast_mul,
 155    ast_div,
 156    ast_mod,
 157    ast_lshift,
 158    ast_rshift,
 159    ast_less,
 160    ast_greater,
 161    ast_lequal,
 162    ast_gequal,
 163    ast_equal,
 164    ast_nequal,
 165    ast_bit_and,
 166    ast_bit_xor,
 167    ast_bit_or,
 168    ast_bit_not,
 169    ast_logic_and,
 170    ast_logic_xor,
 171    ast_logic_or,
 172    ast_logic_not,
 173
 174    ast_mul_assign,
 175    ast_div_assign,
 176    ast_mod_assign,
 177    ast_add_assign,
 178    ast_sub_assign,
 179    ast_ls_assign,
 180    ast_rs_assign,
 181    ast_and_assign,
 182    ast_xor_assign,
 183    ast_or_assign,
 184
 185    ast_conditional,
 186
 187    ast_pre_inc,
 188    ast_pre_dec,
 189    ast_post_inc,
 190    ast_post_dec,
 191    ast_field_selection,
 192    ast_array_index,
 193    ast_unsized_array_dim,
 194
 195    ast_function_call,
 196
 197    ast_identifier,
 198    ast_int_constant,
 199    ast_uint_constant,
 200    ast_float_constant,
 201    ast_bool_constant,
 202    ast_double_constant,
 203    ast_int64_constant,
 204    ast_uint64_constant,
 205
 206    ast_sequence,
 207    ast_aggregate
 208
 209    /**
 210     * Number of possible operators for an ast_expression
 211     *
 212     * This is done as a define instead of as an additional value in the enum so
 213     * that the compiler won't generate spurious messages like "warning:
 214     * enumeration value ‘ast_num_operators’ not handled in switch"
 215     */
 216    #define AST_NUM_OPERATORS (ast_aggregate + 1)
 217 };
 218
 219 /**
 220  * Representation of any sort of expression.
 221  */
 222 class ast_expression : public ast_node {
 223 public:
 224    ast_expression(int oper, ast_expression *,
 225                   ast_expression *, ast_expression *);
 226
 227    ast_expression(const char *identifier) :
 228       oper(ast_identifier)
 229    {
 230       subexpressions[0] = NULL;
 231       subexpressions[1] = NULL;
 232       subexpressions[2] = NULL;
 233       primary_expression.identifier = identifier;
 234       this->non_lvalue_description = NULL;
 235       this->is_lhs = false;
 236    }
 237
 238    static const char *operator_string(enum ast_operators op);
 239
 240    virtual ir_rvalue *hir(exec_list *instructions,
 241                           struct _mesa_glsl_parse_state *state);
 242
 243    virtual void hir_no_rvalue(exec_list *instructions,
 244                               struct _mesa_glsl_parse_state *state);
 245
 246    virtual bool has_sequence_subexpression() const;
 247
 248    ir_rvalue *do_hir(exec_list *instructions,
 249                      struct _mesa_glsl_parse_state *state,
 250                      bool needs_rvalue);
 251
 252    virtual void print(void) const;
 253
 254    enum ast_operators oper;
 255
 256    ast_expression *subexpressions[3];
 257
 258    union {
 259       const char *identifier;
 260       int int_constant;
 261       float float_constant;
 262       unsigned uint_constant;
 263       int bool_constant;
 264       double double_constant;
 265       uint64_t uint64_constant;
 266       int64_t int64_constant;
 267    } primary_expression;
 268
 269
 270    /**
 271     * List of expressions for an \c ast_sequence or parameters for an
 272     * \c ast_function_call
 273     */
 274    exec_list expressions;
 275
 276    /**
 277     * For things that can't be l-values, this describes what it is.
 278     *
 279     * This text is used by the code that generates IR for assignments to
 280     * detect and emit useful messages for assignments to some things that
 281     * can't be l-values.  For example, pre- or post-incerement expressions.
 282     *
 283     * \note
 284     * This pointer may be \c NULL.
 285     */
 286    const char *non_lvalue_description;
 287
 288    void set_is_lhs(bool new_value);
 289
 290 private:
 291    bool is_lhs;
 292 };
 293
 294 class ast_expression_bin : public ast_expression {
 295 public:
 296    ast_expression_bin(int oper, ast_expression *, ast_expression *);
 297
 298    virtual void print(void) const;
 299 };
 300
 301 /**
 302  * Subclass of expressions for function calls
 303  */
 304 class ast_function_expression : public ast_expression {
 305 public:
 306    ast_function_expression(ast_expression *callee)
 307       : ast_expression(ast_function_call, callee,
 308                        NULL, NULL),
 309         cons(false)
 310    {
 311       /* empty */
 312    }
 313
 314    ast_function_expression(class ast_type_specifier *type)
 315       : ast_expression(ast_function_call, (ast_expression *) type,
 316                        NULL, NULL),
 317         cons(true)
 318    {
 319       /* empty */
 320    }
 321
 322    bool is_constructor() const
 323    {
 324       return cons;
 325    }
 326
 327    virtual ir_rvalue *hir(exec_list *instructions,
 328                           struct _mesa_glsl_parse_state *state);
 329
 330    virtual void hir_no_rvalue(exec_list *instructions,
 331                               struct _mesa_glsl_parse_state *state);
 332
 333    virtual bool has_sequence_subexpression() const;
 334
 335 private:
 336    /**
 337     * Is this function call actually a constructor?
 338     */
 339    bool cons;
 340    ir_rvalue *
 341    handle_method(exec_list *instructions,
 342                  struct _mesa_glsl_parse_state *state);
 343 };
 344
 345 class ast_subroutine_list : public ast_node
 346 {
 347 public:
 348    virtual void print(void) const;
 349    exec_list declarations;
 350 };
 351
 352 class ast_array_specifier : public ast_node {
 353 public:
 354    ast_array_specifier(const struct YYLTYPE &locp, ast_expression *dim)
 355    {
 356       set_location(locp);
 357       array_dimensions.push_tail(&dim->link);
 358    }
 359
 360    void add_dimension(ast_expression *dim)
 361    {
 362       array_dimensions.push_tail(&dim->link);
 363    }
 364
 365    bool is_single_dimension() const
 366    {
 367       return this->array_dimensions.get_tail_raw()->prev != NULL &&
 368              this->array_dimensions.get_tail_raw()->prev->is_head_sentinel();
 369    }
 370
 371    virtual void print(void) const;
 372
 373    /* This list contains objects of type ast_node containing the
 374     * array dimensions in outermost-to-innermost order.
 375     */
 376    exec_list array_dimensions;
 377 };
 378
 379 class ast_layout_expression : public ast_node {
 380 public:
 381    ast_layout_expression(const struct YYLTYPE &locp, ast_expression *expr)
 382    {
 383       set_location(locp);
 384       layout_const_expressions.push_tail(&expr->link);
 385    }
 386
 387    bool process_qualifier_constant(struct _mesa_glsl_parse_state *state,
 388                                    const char *qual_indentifier,
 389                                    unsigned *value, bool can_be_zero);
 390
 391    void merge_qualifier(ast_layout_expression *l_expr)
 392    {
 393       layout_const_expressions.append_list(&l_expr->layout_const_expressions);
 394    }
 395
 396    exec_list layout_const_expressions;
 397 };
 398
 399 /**
 400  * C-style aggregate initialization class
 401  *
 402  * Represents C-style initializers of vectors, matrices, arrays, and
 403  * structures. E.g., vec3 pos = {1.0, 0.0, -1.0} is equivalent to
 404  * vec3 pos = vec3(1.0, 0.0, -1.0).
 405  *
 406  * Specified in GLSL 4.20 and GL_ARB_shading_language_420pack.
 407  *
 408  * \sa _mesa_ast_set_aggregate_type
 409  */
 410 class ast_aggregate_initializer : public ast_expression {
 411 public:
 412    ast_aggregate_initializer()
 413       : ast_expression(ast_aggregate, NULL, NULL, NULL),
 414         constructor_type(NULL)
 415    {
 416       /* empty */
 417    }
 418
 419    /**
 420     * glsl_type of the aggregate, which is inferred from the LHS of whatever
 421     * the aggregate is being used to initialize.  This can't be inferred at
 422     * parse time (since the parser deals with ast_type_specifiers, not
 423     * glsl_types), so the parser leaves it NULL.  However, the ast-to-hir
 424     * conversion code makes sure to fill it in with the appropriate type
 425     * before hir() is called.
 426     */
 427    const glsl_type *constructor_type;
 428
 429    virtual ir_rvalue *hir(exec_list *instructions,
 430                           struct _mesa_glsl_parse_state *state);
 431
 432    virtual void hir_no_rvalue(exec_list *instructions,
 433                               struct _mesa_glsl_parse_state *state);
 434 };
 435
 436
 437 class ast_compound_statement : public ast_node {
 438 public:
 439    ast_compound_statement(int new_scope, ast_node *statements);
 440    virtual void print(void) const;
 441
 442    virtual ir_rvalue *hir(exec_list *instructions,
 443                           struct _mesa_glsl_parse_state *state);
 444
 445    int new_scope;
 446    exec_list statements;
 447 };
 448
 449 class ast_declaration : public ast_node {
 450 public:
 451    ast_declaration(const char *identifier,
 452                    ast_array_specifier *array_specifier,
 453                    ast_expression *initializer);
 454    virtual void print(void) const;
 455
 456    const char *identifier;
 457
 458    ast_array_specifier *array_specifier;
 459
 460    ast_expression *initializer;
 461 };
 462
 463
 464 enum {
 465    ast_precision_none = 0, /**< Absence of precision qualifier. */
 466    ast_precision_high,
 467    ast_precision_medium,
 468    ast_precision_low
 469 };
 470
 471 enum {
 472    ast_depth_none = 0, /**< Absence of depth qualifier. */
 473    ast_depth_any,
 474    ast_depth_greater,
 475    ast_depth_less,
 476    ast_depth_unchanged
 477 };
 478
 479 struct ast_type_qualifier {
 480    DECLARE_RALLOC_CXX_OPERATORS(ast_type_qualifier);
 481    /* Note: this bitset needs to have at least as many bits as the 'q'
 482     * struct has flags, below.  Previously, the size was 128 instead of 96.
 483     * But an apparent bug in GCC 5.4.0 causes bad SSE code generation
 484     * elsewhere, leading to a crash.  96 bits works around the issue.
 485     * See https://bugs.freedesktop.org/show_bug.cgi?id=105497
 486     */
 487    DECLARE_BITSET_T(bitset_t, 96);
 488
 489    union flags {
 490       struct {
 491          unsigned invariant:1;
 492          unsigned precise:1;
 493          unsigned constant:1;
 494          unsigned attribute:1;
 495          unsigned varying:1;
 496          unsigned in:1;
 497          unsigned out:1;
 498          unsigned centroid:1;
 499          unsigned sample:1;
 500          unsigned patch:1;
 501          unsigned uniform:1;
 502          unsigned buffer:1;
 503          unsigned shared_storage:1;
 504          unsigned smooth:1;
 505          unsigned flat:1;
 506          unsigned noperspective:1;
 507
 508          /** \name Layout qualifiers for GL_ARB_fragment_coord_conventions */
 509          /*@{*/
 510          unsigned origin_upper_left:1;
 511          unsigned pixel_center_integer:1;
 512          /*@}*/
 513
 514          /**
 515           * Flag set if GL_ARB_enhanced_layouts "align" layout qualifier is
 516           * used.
 517           */
 518          unsigned explicit_align:1;
 519
 520          /**
 521           * Flag set if GL_ARB_explicit_attrib_location "location" layout
 522           * qualifier is used.
 523           */
 524          unsigned explicit_location:1;
 525          /**
 526           * Flag set if GL_ARB_explicit_attrib_location "index" layout
 527           * qualifier is used.
 528           */
 529          unsigned explicit_index:1;
 530
 531          /**
 532           * Flag set if GL_ARB_enhanced_layouts "component" layout
 533           * qualifier is used.
 534           */
 535          unsigned explicit_component:1;
 536
 537          /**
 538           * Flag set if GL_ARB_shading_language_420pack "binding" layout
 539           * qualifier is used.
 540           */
 541          unsigned explicit_binding:1;
 542
 543          /**
 544           * Flag set if GL_ARB_shader_atomic counter "offset" layout
 545           * qualifier is used.
 546           */
 547          unsigned explicit_offset:1;
 548
 549          /** \name Layout qualifiers for GL_AMD_conservative_depth */
 550          /** \{ */
 551          unsigned depth_type:1;
 552          /** \} */
 553
 554          /** \name Layout qualifiers for GL_ARB_uniform_buffer_object */
 555          /** \{ */
 556          unsigned std140:1;
 557          unsigned std430:1;
 558          unsigned shared:1;
 559          unsigned packed:1;
 560          unsigned column_major:1;
 561          unsigned row_major:1;
 562          /** \} */
 563
 564          /** \name Layout qualifiers for GLSL 1.50 geometry shaders */
 565          /** \{ */
 566          unsigned prim_type:1;
 567          unsigned max_vertices:1;
 568          /** \} */
 569
 570          /**
 571           * local_size_{x,y,z} flags for compute shaders.  Bit 0 represents
 572           * local_size_x, and so on.
 573           */
 574          unsigned local_size:3;
 575
 576          /** \name Layout qualifiers for ARB_compute_variable_group_size. */
 577          /** \{ */
 578          unsigned local_size_variable:1;
 579          /** \} */
 580
 581          /** \name Layout and memory qualifiers for ARB_shader_image_load_store. */
 582          /** \{ */
 583          unsigned early_fragment_tests:1;
 584          unsigned explicit_image_format:1;
 585          unsigned coherent:1;
 586          unsigned _volatile:1;
 587          unsigned restrict_flag:1;
 588          unsigned read_only:1; /**< "readonly" qualifier. */
 589          unsigned write_only:1; /**< "writeonly" qualifier. */
 590          /** \} */
 591
 592          /** \name Layout qualifiers for GL_ARB_gpu_shader5 */
 593          /** \{ */
 594          unsigned invocations:1;
 595          unsigned stream:1; /**< Has stream value assigned  */
 596          unsigned explicit_stream:1; /**< stream value assigned explicitly by shader code */
 597          /** \} */
 598
 599          /** \name Layout qualifiers for GL_ARB_enhanced_layouts */
 600          /** \{ */
 601          unsigned explicit_xfb_offset:1; /**< xfb_offset value assigned explicitly by shader code */
 602          unsigned xfb_buffer:1; /**< Has xfb_buffer value assigned  */
 603          unsigned explicit_xfb_buffer:1; /**< xfb_buffer value assigned explicitly by shader code */
 604          unsigned xfb_stride:1; /**< Is xfb_stride value yet to be merged with global values  */
 605          unsigned explicit_xfb_stride:1; /**< xfb_stride value assigned explicitly by shader code */
 606          /** \} */
 607
 608          /** \name Layout qualifiers for GL_ARB_tessellation_shader */
 609          /** \{ */
 610          /* tess eval input layout */
 611          /* gs prim_type reused for primitive mode */
 612          unsigned vertex_spacing:1;
 613          unsigned ordering:1;
 614          unsigned point_mode:1;
 615          /* tess control output layout */
 616          unsigned vertices:1;
 617          /** \} */
 618
 619          /** \name Qualifiers for GL_ARB_shader_subroutine */
 620          /** \{ */
 621          unsigned subroutine:1;  /**< Is this marked 'subroutine' */
 622          /** \} */
 623
 624          /** \name Qualifiers for GL_KHR_blend_equation_advanced */
 625          /** \{ */
 626          unsigned blend_support:1; /**< Are there any blend_support_ qualifiers */
 627          /** \} */
 628
 629          /**
 630           * Flag set if GL_ARB_post_depth_coverage layout qualifier is used.
 631           */
 632          unsigned post_depth_coverage:1;
 633
 634          /**
 635           * Flags for the layout qualifers added by ARB_fragment_shader_interlock
 636           */
 637
 638          unsigned pixel_interlock_ordered:1;
 639          unsigned pixel_interlock_unordered:1;
 640          unsigned sample_interlock_ordered:1;
 641          unsigned sample_interlock_unordered:1;
 642
 643          /**
 644           * Flag set if GL_INTEL_conservartive_rasterization layout qualifier
 645           * is used.
 646           */
 647          unsigned inner_coverage:1;
 648
 649          /** \name Layout qualifiers for GL_ARB_bindless_texture */
 650          /** \{ */
 651          unsigned bindless_sampler:1;
 652          unsigned bindless_image:1;
 653          unsigned bound_sampler:1;
 654          unsigned bound_image:1;
 655          /** \} */
 656
 657          /** \name Layout qualifiers for GL_EXT_shader_framebuffer_fetch_non_coherent */
 658          /** \{ */
 659          unsigned non_coherent:1;
 660          /** \} */
 661
 662          /** \name Layout qualifiers for NV_compute_shader_derivatives */
 663          /** \{ */
 664          unsigned derivative_group:1;
 665          /** \} */
 666       }
 667       /** \brief Set of flags, accessed by name. */
 668       q;
 669
 670       /** \brief Set of flags, accessed as a bitmask. */
 671       bitset_t i;
 672    } flags;
 673
 674    /** Precision of the type (highp/medium/lowp). */
 675    unsigned precision:2;
 676
 677    /** Type of layout qualifiers for GL_AMD_conservative_depth. */
 678    unsigned depth_type:3;
 679
 680    /**
 681     * Alignment specified via GL_ARB_enhanced_layouts "align" layout qualifier
 682     */
 683    ast_expression *align;
 684
 685    /** Geometry shader invocations for GL_ARB_gpu_shader5. */
 686    ast_layout_expression *invocations;
 687
 688    /**
 689     * Location specified via GL_ARB_explicit_attrib_location layout
 690     *
 691     * \note
 692     * This field is only valid if \c explicit_location is set.
 693     */
 694    ast_expression *location;
 695    /**
 696     * Index specified via GL_ARB_explicit_attrib_location layout
 697     *
 698     * \note
 699     * This field is only valid if \c explicit_index is set.
 700     */
 701    ast_expression *index;
 702
 703    /**
 704     * Component specified via GL_ARB_enhaced_layouts
 705     *
 706     * \note
 707     * This field is only valid if \c explicit_component is set.
 708     */
 709    ast_expression *component;
 710
 711    /** Maximum output vertices in GLSL 1.50 geometry shaders. */
 712    ast_layout_expression *max_vertices;
 713
 714    /** Stream in GLSL 1.50 geometry shaders. */
 715    ast_expression *stream;
 716
 717    /** xfb_buffer specified via the GL_ARB_enhanced_layouts keyword. */
 718    ast_expression *xfb_buffer;
 719
 720    /** xfb_stride specified via the GL_ARB_enhanced_layouts keyword. */
 721    ast_expression *xfb_stride;
 722
 723    /** global xfb_stride values for each buffer */
 724    ast_layout_expression *out_xfb_stride[MAX_FEEDBACK_BUFFERS];
 725
 726    /**
 727     * Input or output primitive type in GLSL 1.50 geometry shaders
 728     * and tessellation shaders.
 729     */
 730    GLenum prim_type;
 731
 732    /**
 733     * Binding specified via GL_ARB_shading_language_420pack's "binding" keyword.
 734     *
 735     * \note
 736     * This field is only valid if \c explicit_binding is set.
 737     */
 738    ast_expression *binding;
 739
 740    /**
 741     * Offset specified via GL_ARB_shader_atomic_counter's or
 742     * GL_ARB_enhanced_layouts "offset" keyword, or by GL_ARB_enhanced_layouts
 743     * "xfb_offset" keyword.
 744     *
 745     * \note
 746     * This field is only valid if \c explicit_offset is set.
 747     */
 748    ast_expression *offset;
 749
 750    /**
 751     * Local size specified via GL_ARB_compute_shader's "local_size_{x,y,z}"
 752     * layout qualifier.  Element i of this array is only valid if
 753     * flags.q.local_size & (1 << i) is set.
 754     */
 755    ast_layout_expression *local_size[3];
 756
 757    /** Tessellation evaluation shader: vertex spacing (equal, fractional even/odd) */
 758    enum gl_tess_spacing vertex_spacing;
 759
 760    /** Tessellation evaluation shader: vertex ordering (CW or CCW) */
 761    GLenum ordering;
 762
 763    /** Tessellation evaluation shader: point mode */
 764    bool point_mode;
 765
 766    /** Tessellation control shader: number of output vertices */
 767    ast_layout_expression *vertices;
 768
 769    /**
 770     * Image format specified with an ARB_shader_image_load_store
 771     * layout qualifier.
 772     *
 773     * \note
 774     * This field is only valid if \c explicit_image_format is set.
 775     */
 776    GLenum image_format;
 777
 778    /**
 779     * Arrangement of invocations used to calculate derivatives in a compute
 780     * shader.  From NV_compute_shader_derivatives.
 781     */
 782    enum gl_derivative_group derivative_group;
 783
 784    /**
 785     * Base type of the data read from or written to this image.  Only
 786     * the following enumerants are allowed: GLSL_TYPE_UINT,
 787     * GLSL_TYPE_INT, GLSL_TYPE_FLOAT.
 788     *
 789     * \note
 790     * This field is only valid if \c explicit_image_format is set.
 791     */
 792    glsl_base_type image_base_type;
 793
 794    /**
 795     * Return true if and only if an interpolation qualifier is present.
 796     */
 797    bool has_interpolation() const;
 798
 799    /**
 800     * Return whether a layout qualifier is present.
 801     */
 802    bool has_layout() const;
 803
 804    /**
 805     * Return whether a storage qualifier is present.
 806     */
 807    bool has_storage() const;
 808
 809    /**
 810     * Return whether an auxiliary storage qualifier is present.
 811     */
 812    bool has_auxiliary_storage() const;
 813
 814    /**
 815     * Return true if and only if a memory qualifier is present.
 816     */
 817    bool has_memory() const;
 818
 819    /**
 820     * Return true if the qualifier is a subroutine declaration.
 821     */
 822    bool is_subroutine_decl() const;
 823
 824    bool merge_qualifier(YYLTYPE *loc,
 825                         _mesa_glsl_parse_state *state,
 826                         const ast_type_qualifier &q,
 827                         bool is_single_layout_merge,
 828                         bool is_multiple_layouts_merge = false);
 829
 830    /**
 831     * Validate current qualifier against the global out one.
 832     */
 833    bool validate_out_qualifier(YYLTYPE *loc,
 834                                _mesa_glsl_parse_state *state);
 835
 836    /**
 837     * Merge current qualifier into the global out one.
 838     */
 839    bool merge_into_out_qualifier(YYLTYPE *loc,
 840                                  _mesa_glsl_parse_state *state,
 841                                  ast_node* &node);
 842
 843    /**
 844     * Validate current qualifier against the global in one.
 845     */
 846    bool validate_in_qualifier(YYLTYPE *loc,
 847                               _mesa_glsl_parse_state *state);
 848
 849    /**
 850     * Merge current qualifier into the global in one.
 851     */
 852    bool merge_into_in_qualifier(YYLTYPE *loc,
 853                                 _mesa_glsl_parse_state *state,
 854                                 ast_node* &node);
 855
 856    /**
 857     * Push pending layout qualifiers to the global values.
 858     */
 859    bool push_to_global(YYLTYPE *loc,
 860                        _mesa_glsl_parse_state *state);
 861
 862    bool validate_flags(YYLTYPE *loc,
 863                        _mesa_glsl_parse_state *state,
 864                        const ast_type_qualifier &allowed_flags,
 865                        const char *message, const char *name);
 866
 867    ast_subroutine_list *subroutine_list;
 868 };
 869
 870 class ast_declarator_list;
 871
 872 class ast_struct_specifier : public ast_node {
 873 public:
 874    ast_struct_specifier(const char *identifier,
 875                         ast_declarator_list *declarator_list);
 876    virtual void print(void) const;
 877
 878    virtual ir_rvalue *hir(exec_list *instructions,
 879                           struct _mesa_glsl_parse_state *state);
 880
 881    const char *name;
 882    ast_type_qualifier *layout;
 883    /* List of ast_declarator_list * */
 884    exec_list declarations;
 885    bool is_declaration;
 886    const glsl_type *type;
 887 };
 888
 889
 890
 891 class ast_type_specifier : public ast_node {
 892 public:
 893    /** Construct a type specifier from a type name */
 894    ast_type_specifier(const char *name)
 895       : type(NULL), type_name(name), structure(NULL), array_specifier(NULL),
 896         default_precision(ast_precision_none)
 897    {
 898       /* empty */
 899    }
 900
 901    /** Construct a type specifier from a structure definition */
 902    ast_type_specifier(ast_struct_specifier *s)
 903       : type(NULL), type_name(s->name), structure(s), array_specifier(NULL),
 904         default_precision(ast_precision_none)
 905    {
 906       /* empty */
 907    }
 908
 909    ast_type_specifier(const glsl_type *t)
 910       : type(t), type_name(t->name), structure(NULL), array_specifier(NULL),
 911         default_precision(ast_precision_none)
 912    {
 913       /* empty */
 914    }
 915
 916    const struct glsl_type *glsl_type(const char **name,
 917                                      struct _mesa_glsl_parse_state *state)
 918       const;
 919
 920    virtual void print(void) const;
 921
 922    ir_rvalue *hir(exec_list *, struct _mesa_glsl_parse_state *);
 923
 924    const struct glsl_type *type;
 925    const char *type_name;
 926    ast_struct_specifier *structure;
 927
 928    ast_array_specifier *array_specifier;
 929
 930    /** For precision statements, this is the given precision; otherwise none. */
 931    unsigned default_precision:2;
 932 };
 933
 934
 935 class ast_fully_specified_type : public ast_node {
 936 public:
 937    virtual void print(void) const;
 938    bool has_qualifiers(_mesa_glsl_parse_state *state) const;
 939
 940    ast_fully_specified_type() : qualifier(), specifier(NULL)
 941    {
 942    }
 943
 944    const struct glsl_type *glsl_type(const char **name,
 945                                      struct _mesa_glsl_parse_state *state)
 946       const;
 947
 948    ast_type_qualifier qualifier;
 949    ast_type_specifier *specifier;
 950 };
 951
 952
 953 class ast_declarator_list : public ast_node {
 954 public:
 955    ast_declarator_list(ast_fully_specified_type *);
 956    virtual void print(void) const;
 957
 958    virtual ir_rvalue *hir(exec_list *instructions,
 959                           struct _mesa_glsl_parse_state *state);
 960
 961    ast_fully_specified_type *type;
 962    /** List of 'ast_declaration *' */
 963    exec_list declarations;
 964
 965    /**
 966     * Flags for redeclarations. In these cases, no type is specified, to
 967     * `type` is allowed to be NULL. In all other cases, this would be an error.
 968     */
 969    int invariant;     /** < `invariant` redeclaration */
 970    int precise;       /** < `precise` redeclaration */
 971 };
 972
 973
 974 class ast_parameter_declarator : public ast_node {
 975 public:
 976    ast_parameter_declarator() :
 977       type(NULL),
 978       identifier(NULL),
 979       array_specifier(NULL),
 980       formal_parameter(false),
 981       is_void(false)
 982    {
 983       /* empty */
 984    }
 985
 986    virtual void print(void) const;
 987
 988    virtual ir_rvalue *hir(exec_list *instructions,
 989                           struct _mesa_glsl_parse_state *state);
 990
 991    ast_fully_specified_type *type;
 992    const char *identifier;
 993    ast_array_specifier *array_specifier;
 994
 995    static void parameters_to_hir(exec_list *ast_parameters,
 996                                  bool formal, exec_list *ir_parameters,
 997                                  struct _mesa_glsl_parse_state *state);
 998
 999 private:
1000    /** Is this parameter declaration part of a formal parameter list? */
1001    bool formal_parameter;
1002
1003    /**
1004     * Is this parameter 'void' type?
1005     *
1006     * This field is set by \c ::hir.
1007     */
1008    bool is_void;
1009 };
1010
1011
1012 class ast_function : public ast_node {
1013 public:
1014    ast_function(void);
1015
1016    virtual void print(void) const;
1017
1018    virtual ir_rvalue *hir(exec_list *instructions,
1019                           struct _mesa_glsl_parse_state *state);
1020
1021    ast_fully_specified_type *return_type;
1022    const char *identifier;
1023
1024    exec_list parameters;
1025
1026 private:
1027    /**
1028     * Is this prototype part of the function definition?
1029     *
1030     * Used by ast_function_definition::hir to process the parameters, etc.
1031     * of the function.
1032     *
1033     * \sa ::hir
1034     */
1035    bool is_definition;
1036
1037    /**
1038     * Function signature corresponding to this function prototype instance
1039     *
1040     * Used by ast_function_definition::hir to process the parameters, etc.
1041     * of the function.
1042     *
1043     * \sa ::hir
1044     */
1045    class ir_function_signature *signature;
1046
1047    friend class ast_function_definition;
1048 };
1049
1050
1051 class ast_expression_statement : public ast_node {
1052 public:
1053    ast_expression_statement(ast_expression *);
1054    virtual void print(void) const;
1055
1056    virtual ir_rvalue *hir(exec_list *instructions,
1057                           struct _mesa_glsl_parse_state *state);
1058
1059    ast_expression *expression;
1060 };
1061
1062
1063 class ast_case_label : public ast_node {
1064 public:
1065    ast_case_label(ast_expression *test_value);
1066    virtual void print(void) const;
1067
1068    virtual ir_rvalue *hir(exec_list *instructions,
1069                           struct _mesa_glsl_parse_state *state);
1070
1071    /**
1072     * An test value of NULL means 'default'.
1073     */
1074    ast_expression *test_value;
1075 };
1076
1077
1078 class ast_case_label_list : public ast_node {
1079 public:
1080    ast_case_label_list(void);
1081    virtual void print(void) const;
1082
1083    virtual ir_rvalue *hir(exec_list *instructions,
1084                           struct _mesa_glsl_parse_state *state);
1085
1086    /**
1087     * A list of case labels.
1088     */
1089    exec_list labels;
1090 };
1091
1092
1093 class ast_case_statement : public ast_node {
1094 public:
1095    ast_case_statement(ast_case_label_list *labels);
1096    virtual void print(void) const;
1097
1098    virtual ir_rvalue *hir(exec_list *instructions,
1099                           struct _mesa_glsl_parse_state *state);
1100
1101    ast_case_label_list *labels;
1102
1103    /**
1104     * A list of statements.
1105     */
1106    exec_list stmts;
1107 };
1108
1109
1110 class ast_case_statement_list : public ast_node {
1111 public:
1112    ast_case_statement_list(void);
1113    virtual void print(void) const;
1114
1115    virtual ir_rvalue *hir(exec_list *instructions,
1116                           struct _mesa_glsl_parse_state *state);
1117
1118    /**
1119     * A list of cases.
1120     */
1121    exec_list cases;
1122 };
1123
1124
1125 class ast_switch_body : public ast_node {
1126 public:
1127    ast_switch_body(ast_case_statement_list *stmts);
1128    virtual void print(void) const;
1129
1130    virtual ir_rvalue *hir(exec_list *instructions,
1131                           struct _mesa_glsl_parse_state *state);
1132
1133    ast_case_statement_list *stmts;
1134 };
1135
1136
1137 class ast_selection_statement : public ast_node {
1138 public:
1139    ast_selection_statement(ast_expression *condition,
1140                            ast_node *then_statement,
1141                            ast_node *else_statement);
1142    virtual void print(void) const;
1143
1144    virtual ir_rvalue *hir(exec_list *instructions,
1145                           struct _mesa_glsl_parse_state *state);
1146
1147    ast_expression *condition;
1148    ast_node *then_statement;
1149    ast_node *else_statement;
1150 };
1151
1152
1153 class ast_switch_statement : public ast_node {
1154 public:
1155    ast_switch_statement(ast_expression *test_expression,
1156                         ast_node *body);
1157    virtual void print(void) const;
1158
1159    virtual ir_rvalue *hir(exec_list *instructions,
1160                           struct _mesa_glsl_parse_state *state);
1161
1162    ast_expression *test_expression;
1163    ast_node *body;
1164
1165 protected:
1166    void test_to_hir(exec_list *, struct _mesa_glsl_parse_state *);
1167 };
1168
1169 class ast_iteration_statement : public ast_node {
1170 public:
1171    ast_iteration_statement(int mode, ast_node *init, ast_node *condition,
1172                            ast_expression *rest_expression, ast_node *body);
1173
1174    virtual void print(void) const;
1175
1176    virtual ir_rvalue *hir(exec_list *, struct _mesa_glsl_parse_state *);
1177
1178    enum ast_iteration_modes {
1179       ast_for,
1180       ast_while,
1181       ast_do_while
1182    } mode;
1183
1184
1185    ast_node *init_statement;
1186    ast_node *condition;
1187    ast_expression *rest_expression;
1188
1189    ast_node *body;
1190
1191    /**
1192     * Generate IR from the condition of a loop
1193     *
1194     * This is factored out of ::hir because some loops have the condition
1195     * test at the top (for and while), and others have it at the end (do-while).
1196     */
1197    void condition_to_hir(exec_list *, struct _mesa_glsl_parse_state *);
1198 };
1199
1200
1201 class ast_jump_statement : public ast_node {
1202 public:
1203    ast_jump_statement(int mode, ast_expression *return_value);
1204    virtual void print(void) const;
1205
1206    virtual ir_rvalue *hir(exec_list *instructions,
1207                           struct _mesa_glsl_parse_state *state);
1208
1209    enum ast_jump_modes {
1210       ast_continue,
1211       ast_break,
1212       ast_return,
1213       ast_discard
1214    } mode;
1215
1216    ast_expression *opt_return_value;
1217 };
1218
1219
1220 class ast_demote_statement : public ast_node {
1221 public:
1222    ast_demote_statement(void) {}
1223    virtual void print(void) const;
1224
1225    virtual ir_rvalue *hir(exec_list *instructions,
1226                           struct _mesa_glsl_parse_state *state);
1227 };
1228
1229
1230 class ast_function_definition : public ast_node {
1231 public:
1232    ast_function_definition() : prototype(NULL), body(NULL)
1233    {
1234    }
1235
1236    virtual void print(void) const;
1237
1238    virtual ir_rvalue *hir(exec_list *instructions,
1239                           struct _mesa_glsl_parse_state *state);
1240
1241    ast_function *prototype;
1242    ast_compound_statement *body;
1243 };
1244
1245 class ast_interface_block : public ast_node {
1246 public:
1247    ast_interface_block(const char *instance_name,
1248                        ast_array_specifier *array_specifier)
1249    : block_name(NULL), instance_name(instance_name),
1250      array_specifier(array_specifier)
1251    {
1252    }
1253
1254    virtual ir_rvalue *hir(exec_list *instructions,
1255                           struct _mesa_glsl_parse_state *state);
1256
1257    ast_type_qualifier default_layout;
1258    ast_type_qualifier layout;
1259    const char *block_name;
1260
1261    /**
1262     * Declared name of the block instance, if specified.
1263     *
1264     * If the block does not have an instance name, this field will be
1265     * \c NULL.
1266     */
1267    const char *instance_name;
1268
1269    /** List of ast_declarator_list * */
1270    exec_list declarations;
1271
1272    /**
1273     * Declared array size of the block instance
1274     *
1275     * If the block is not declared as an array or if the block instance array
1276     * is unsized, this field will be \c NULL.
1277     */
1278    ast_array_specifier *array_specifier;
1279 };
1280
1281
1282 /**
1283  * AST node representing a declaration of the output layout for tessellation
1284  * control shaders.
1285  */
1286 class ast_tcs_output_layout : public ast_node
1287 {
1288 public:
1289    ast_tcs_output_layout(const struct YYLTYPE &locp)
1290    {
1291       set_location(locp);
1292    }
1293
1294    virtual ir_rvalue *hir(exec_list *instructions,
1295                           struct _mesa_glsl_parse_state *state);
1296 };
1297
1298
1299 /**
1300  * AST node representing a declaration of the input layout for geometry
1301  * shaders.
1302  */
1303 class ast_gs_input_layout : public ast_node
1304 {
1305 public:
1306    ast_gs_input_layout(const struct YYLTYPE &locp, GLenum prim_type)
1307       : prim_type(prim_type)
1308    {
1309       set_location(locp);
1310    }
1311
1312    virtual ir_rvalue *hir(exec_list *instructions,
1313                           struct _mesa_glsl_parse_state *state);
1314
1315 private:
1316    const GLenum prim_type;
1317 };
1318
1319
1320 /**
1321  * AST node representing a decalaration of the input layout for compute
1322  * shaders.
1323  */
1324 class ast_cs_input_layout : public ast_node
1325 {
1326 public:
1327    ast_cs_input_layout(const struct YYLTYPE &locp,
1328                        ast_layout_expression *const *local_size)
1329    {
1330       for (int i = 0; i < 3; i++) {
1331          this->local_size[i] = local_size[i];
1332       }
1333       set_location(locp);
1334    }
1335
1336    virtual ir_rvalue *hir(exec_list *instructions,
1337                           struct _mesa_glsl_parse_state *state);
1338
1339 private:
1340    ast_layout_expression *local_size[3];
1341 };
1342
1343 class ast_warnings_toggle : public ast_node {
1344 public:
1345    ast_warnings_toggle(bool _enable)
1346       : enable(_enable)
1347    {
1348       /* empty */
1349    }
1350
1351    virtual ir_rvalue *hir(exec_list *instructions,
1352                           struct _mesa_glsl_parse_state *state);
1353
1354 private:
1355    bool enable;
1356 };
1357 /*@}*/
1358
1359 extern void
1360 _mesa_ast_to_hir(exec_list *instructions, struct _mesa_glsl_parse_state *state);
1361
1362 extern ir_rvalue *
1363 _mesa_ast_field_selection_to_hir(const ast_expression *expr,
1364                                  exec_list *instructions,
1365                                  struct _mesa_glsl_parse_state *state);
1366
1367 extern ir_rvalue *
1368 _mesa_ast_array_index_to_hir(void *mem_ctx,
1369                              struct _mesa_glsl_parse_state *state,
1370                              ir_rvalue *array, ir_rvalue *idx,
1371                              YYLTYPE &loc, YYLTYPE &idx_loc);
1372
1373 extern void
1374 _mesa_ast_set_aggregate_type(const glsl_type *type,
1375                              ast_expression *expr);
1376
1377 void
1378 emit_function(_mesa_glsl_parse_state *state, ir_function *f);
1379
1380 extern void
1381 check_builtin_array_max_size(const char *name, unsigned size,
1382                              YYLTYPE loc, struct _mesa_glsl_parse_state *state);
1383
1384 extern void _mesa_ast_process_interface_block(YYLTYPE *locp,
1385                                               _mesa_glsl_parse_state *state,
1386                                               ast_interface_block *const block,
1387                                               const struct ast_type_qualifier &q);
1388
1389 extern bool
1390 process_qualifier_constant(struct _mesa_glsl_parse_state *state,
1391                            YYLTYPE *loc,
1392                            const char *qual_indentifier,
1393                            ast_expression *const_expression,
1394                            unsigned *value);
1395 #endif /* AST_H */