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28 /* Note: I will not be using a _t suffix for the
29 * "main" ast node types for now.
32 typedef struct ast_node_common ast_node;
33 typedef struct ast_expression_common ast_expression;
35 typedef struct ast_value_s ast_value;
36 typedef struct ast_function_s ast_function;
37 typedef struct ast_block_s ast_block;
38 typedef struct ast_binary_s ast_binary;
39 typedef struct ast_store_s ast_store;
40 typedef struct ast_binstore_s ast_binstore;
41 typedef struct ast_entfield_s ast_entfield;
42 typedef struct ast_ifthen_s ast_ifthen;
43 typedef struct ast_ternary_s ast_ternary;
44 typedef struct ast_loop_s ast_loop;
45 typedef struct ast_call_s ast_call;
46 typedef struct ast_unary_s ast_unary;
47 typedef struct ast_return_s ast_return;
48 typedef struct ast_member_s ast_member;
49 typedef struct ast_array_index_s ast_array_index;
50 typedef struct ast_breakcont_s ast_breakcont;
51 typedef struct ast_switch_s ast_switch;
52 typedef struct ast_label_s ast_label;
53 typedef struct ast_goto_s ast_goto;
54 typedef struct ast_argpipe_s ast_argpipe;
57 TYPE_ast_node, /* 0 */
58 TYPE_ast_expression, /* 1 */
59 TYPE_ast_value, /* 2 */
60 TYPE_ast_function, /* 3 */
61 TYPE_ast_block, /* 4 */
62 TYPE_ast_binary, /* 5 */
63 TYPE_ast_store, /* 6 */
64 TYPE_ast_binstore, /* 7 */
65 TYPE_ast_entfield, /* 8 */
66 TYPE_ast_ifthen, /* 9 */
67 TYPE_ast_ternary, /* 10 */
68 TYPE_ast_loop, /* 11 */
69 TYPE_ast_call, /* 12 */
70 TYPE_ast_unary, /* 13 */
71 TYPE_ast_return, /* 14 */
72 TYPE_ast_member, /* 15 */
73 TYPE_ast_array_index, /* 16 */
74 TYPE_ast_breakcont, /* 17 */
75 TYPE_ast_switch, /* 18 */
76 TYPE_ast_label, /* 19 */
77 TYPE_ast_goto, /* 20 */
78 TYPE_ast_argpipe /* 21 */
81 #define ast_istype(x, t) ( ((ast_node*)x)->nodetype == (TYPE_##t) )
82 #define ast_ctx(node) (((ast_node*)(node))->context)
83 #define ast_side_effects(node) (((ast_node*)(node))->side_effects)
85 /* Node interface with common components
87 typedef void ast_node_delete(ast_node*);
88 struct ast_node_common
91 /* I don't feel comfortable using keywords like 'delete' as names... */
92 ast_node_delete *destroy;
94 /* keep: if a node contains this node, 'keep'
95 * prevents its dtor from destroying this node as well.
101 #define ast_delete(x) (*( ((ast_node*)(x))->destroy ))((ast_node*)(x))
102 #define ast_unref(x) do \
104 if (! (((ast_node*)(x))->keep) ) { \
109 /* Expression interface
111 * Any expression or block returns an ir_value, and needs
112 * to know the current function.
114 typedef bool ast_expression_codegen(ast_expression*,
118 /* TODO: the codegen function should take an output-type parameter
119 * indicating whether a variable, type, label etc. is expected, and
121 * Then later an ast_ident could have a codegen using this to figure
122 * out what to look for.
123 * eg. in code which uses a not-yet defined variable, the expression
124 * would take an ast_ident, and the codegen would be called with
125 * type `expression`, so the ast_ident's codegen would search for
126 * variables through the environment (or functions, constants...).
128 struct ast_expression_common
131 ast_expression_codegen *codegen;
133 ast_expression *next;
134 /* arrays get a member-count */
138 /* void foo(string...) gets varparam set as a restriction
139 * for variadic parameters
141 ast_expression *varparam;
142 /* The codegen functions should store their output values
143 * so we can call it multiple times without re-evaluating.
144 * Store lvalue and rvalue seperately though. So that
145 * ast_entfield for example can generate both if required.
150 #define AST_FLAG_VARIADIC (1<<0)
151 #define AST_FLAG_NORETURN (1<<1)
152 #define AST_FLAG_INLINE (1<<2)
153 #define AST_FLAG_INITIALIZED (1<<3)
154 #define AST_FLAG_DEPRECATED (1<<4)
155 #define AST_FLAG_INCLUDE_DEF (1<<5)
156 #define AST_FLAG_IS_VARARG (1<<6)
157 #define AST_FLAG_ALIAS (1<<7)
158 /* An array declared as []
159 * so that the size is taken from the initializer */
160 #define AST_FLAG_ARRAY_INIT (1<<8)
161 #define AST_FLAG_TYPE_MASK (AST_FLAG_VARIADIC | AST_FLAG_NORETURN)
165 * Types are also values, both have a type and a name.
166 * especially considering possible constructs like typedefs.
168 * is like creating a 'float foo', foo serving as the type's name.
181 ast_expression expression;
186 const char *argcounter;
188 int cvq; /* const/var qualifier */
189 bool isfield; /* this declares a field */
190 bool isimm; /* an immediate, not just const */
192 basic_value_t constval;
193 /* for TYPE_ARRAY we have an optional vector
194 * of constants when an initializer list
197 basic_value_t *initlist;
199 /* usecount for the parser */
203 ir_value **ir_values;
204 size_t ir_value_count;
206 /* ONLY for arrays in progs version up to 6 */
211 ast_value* ast_value_new(lex_ctx ctx, const char *name, int qctype);
212 ast_value* ast_value_copy(const ast_value *self);
213 /* This will NOT delete an underlying ast_function */
214 void ast_value_delete(ast_value*);
216 bool ast_value_set_name(ast_value*, const char *name);
219 bool ast_value_codegen(ast_value*, ast_function*, bool lvalue, ir_value**);
220 bool ast_local_codegen(ast_value *self, ir_function *func, bool isparam);
223 bool ast_global_codegen(ast_value *self, ir_builder *ir, bool isfield);
225 void ast_value_params_add(ast_value*, ast_value*);
227 bool ast_compare_type(ast_expression *a, ast_expression *b);
228 ast_expression* ast_type_copy(lex_ctx ctx, const ast_expression *ex);
229 #define ast_type_adopt(a, b) ast_type_adopt_impl((ast_expression*)(a), (ast_expression*)(b))
230 void ast_type_adopt_impl(ast_expression *self, const ast_expression *other);
231 void ast_type_to_string(ast_expression *e, char *buf, size_t bufsize);
233 typedef enum ast_binary_ref_s {
235 AST_REF_LEFT = 1 << 1,
236 AST_REF_RIGHT = 1 << 2,
237 AST_REF_ALL = (AST_REF_LEFT | AST_REF_RIGHT)
243 * A value-returning binary expression.
247 ast_expression expression;
250 ast_expression *left;
251 ast_expression *right;
255 ast_binary* ast_binary_new(lex_ctx ctx,
257 ast_expression *left,
258 ast_expression *right);
262 * An assignment including a binary expression with the source as left operand.
263 * Eg. a += b; is a binstore { INSTR_STORE, INSTR_ADD, a, b }
265 struct ast_binstore_s
267 ast_expression expression;
271 ast_expression *dest;
272 ast_expression *source;
273 /* for &~= which uses the destination in a binary in source we can use this */
276 ast_binstore* ast_binstore_new(lex_ctx ctx,
279 ast_expression *left,
280 ast_expression *right);
284 * Regular unary expressions: not,neg
288 ast_expression expression;
291 ast_expression *operand;
293 ast_unary* ast_unary_new(lex_ctx ctx,
295 ast_expression *expr);
299 * Make sure 'return' only happens at the end of a block, otherwise the IR
300 * will refuse to create further instructions.
301 * This should be honored by the parser.
305 ast_expression expression;
306 ast_expression *operand;
308 ast_return* ast_return_new(lex_ctx ctx,
309 ast_expression *expr);
313 * This must do 2 things:
314 * -) Provide a way to fetch an entity field value. (Rvalue)
315 * -) Provide a pointer to an entity field. (Lvalue)
317 * In original QC, there's only a STORE via pointer, but
318 * no LOAD via pointer.
319 * So we must know beforehand if we are going to read or assign
321 * For this we will have to extend the codegen() functions with
322 * a flag saying whether or not we need an L or an R-value.
324 struct ast_entfield_s
326 ast_expression expression;
327 /* The entity can come from an expression of course. */
328 ast_expression *entity;
329 /* As can the field, it just must result in a value of TYPE_FIELD */
330 ast_expression *field;
332 ast_entfield* ast_entfield_new(lex_ctx ctx, ast_expression *entity, ast_expression *field);
333 ast_entfield* ast_entfield_new_force(lex_ctx ctx, ast_expression *entity, ast_expression *field, const ast_expression *outtype);
337 * For now used for vectors. If we get structs or unions
338 * we can have them handled here as well.
342 ast_expression expression;
343 ast_expression *owner;
348 ast_member* ast_member_new(lex_ctx ctx, ast_expression *owner, unsigned int field, const char *name);
349 void ast_member_delete(ast_member*);
350 bool ast_member_set_name(ast_member*, const char *name);
353 /* Array index access:
355 * QC forces us to take special action on arrays:
356 * an ast_store on an ast_array_index must not codegen the index,
357 * but call its setter - unless we have an instruction set which supports
359 * Any other array index access will be codegened to a call to the getter.
360 * In any case, accessing an element via a compiletime-constant index will
361 * result in quick access to that variable.
363 struct ast_array_index_s
365 ast_expression expression;
366 ast_expression *array;
367 ast_expression *index;
369 ast_array_index* ast_array_index_new(lex_ctx ctx, ast_expression *array, ast_expression *index);
373 * copy all varargs starting from a specific index
377 ast_expression expression;
378 ast_expression *index;
380 ast_argpipe* ast_argpipe_new(lex_ctx ctx, ast_expression *index);
384 * Stores left<-right and returns left.
385 * Specialized binary expression node
389 ast_expression expression;
391 ast_expression *dest;
392 ast_expression *source;
394 ast_store* ast_store_new(lex_ctx ctx, int op,
395 ast_expression *d, ast_expression *s);
399 * A general 'if then else' statement, either side can be NULL and will
400 * thus be omitted. It is an error for *both* cases to be NULL at once.
402 * During its 'codegen' it'll be changing the ast_function's block.
404 * An if is also an "expression". Its codegen will put NULL into the
405 * output field though. For ternary expressions an ast_ternary will be
410 ast_expression expression;
411 ast_expression *cond;
412 /* It's all just 'expressions', since an ast_block is one too. */
413 ast_expression *on_true;
414 ast_expression *on_false;
416 ast_ifthen* ast_ifthen_new(lex_ctx ctx, ast_expression *cond, ast_expression *ontrue, ast_expression *onfalse);
418 /* Ternary expressions...
420 * Contrary to 'if-then-else' nodes, ternary expressions actually
421 * return a value, otherwise they behave the very same way.
422 * The difference in 'codegen' is that it'll return the value of
425 * The other difference is that in an ast_ternary, NEITHER side
426 * must be NULL, there's ALWAYS an else branch.
428 * This is the only ast_node beside ast_value which contains
429 * an ir_value. Theoretically we don't need to remember it though.
433 ast_expression expression;
434 ast_expression *cond;
435 /* It's all just 'expressions', since an ast_block is one too. */
436 ast_expression *on_true;
437 ast_expression *on_false;
439 ast_ternary* ast_ternary_new(lex_ctx ctx, ast_expression *cond, ast_expression *ontrue, ast_expression *onfalse);
441 /* A general loop node
443 * For convenience it contains 4 parts:
444 * -) (ini) = initializing expression
445 * -) (pre) = pre-loop condition
446 * -) (pst) = post-loop condition
447 * -) (inc) = "increment" expression
448 * The following is a psudo-representation of this loop
449 * note that '=>' bears the logical meaning of "implies".
450 * (a => b) equals (!a || b)
453 while (has_pre => {pre})
457 continue: // a 'continue' will jump here
458 if (has_pst => {pst})
466 ast_expression expression;
467 ast_expression *initexpr;
468 ast_expression *precond;
469 ast_expression *postcond;
470 ast_expression *increment;
471 ast_expression *body;
472 /* For now we allow a seperate flag on whether or not the condition
473 * is supposed to be true or false.
474 * That way, the parser can generate a 'while not(!x)' for `while(x)`
475 * if desired, which is useful for the new -f{true,false}-empty-strings
481 ast_loop* ast_loop_new(lex_ctx ctx,
482 ast_expression *initexpr,
483 ast_expression *precond, bool pre_not,
484 ast_expression *postcond, bool post_not,
485 ast_expression *increment,
486 ast_expression *body);
490 struct ast_breakcont_s
492 ast_expression expression;
496 ast_breakcont* ast_breakcont_new(lex_ctx ctx, bool iscont, unsigned int levels);
500 * A few notes about this: with the original QCVM, no real optimization
501 * is possible. The SWITCH instruction set isn't really helping a lot, since
502 * it only collapes the EQ and IF instructions into one.
503 * Note: Declaring local variables inside caseblocks is normal.
504 * Since we don't have to deal with a stack there's no unnatural behaviour to
505 * be expected from it.
509 ast_expression *value; /* #20 will replace this */
510 ast_expression *code;
514 ast_expression expression;
516 ast_expression *operand;
517 ast_switch_case *cases;
520 ast_switch* ast_switch_new(lex_ctx ctx, ast_expression *op);
524 * Introduce a label which can be used together with 'goto'
528 ast_expression expression;
532 /* means it has not yet been defined */
536 ast_label* ast_label_new(lex_ctx ctx, const char *name, bool undefined);
540 * Go to a label, the label node is filled in at a later point!
544 ast_expression expression;
547 ir_block *irblock_from;
550 ast_goto* ast_goto_new(lex_ctx ctx, const char *name);
551 void ast_goto_set_label(ast_goto*, ast_label*);
555 * Contains an ast_expression as target, rather than an ast_function/value.
556 * Since it's how QC works, every ast_function has an ast_value
557 * associated anyway - in other words, the VM contains function
558 * pointers for every function anyway. Thus, this node will call
560 * Additionally it contains a list of ast_expressions as parameters.
561 * Since calls can return values, an ast_call is also an ast_expression.
565 ast_expression expression;
566 ast_expression *func;
567 ast_expression* *params;
568 ast_expression *va_count;
570 ast_call* ast_call_new(lex_ctx ctx,
571 ast_expression *funcexpr);
572 bool ast_call_check_types(ast_call*, ast_expression *this_func_va_type);
579 ast_expression expression;
582 ast_expression* *exprs;
583 ast_expression* *collect;
585 ast_block* ast_block_new(lex_ctx ctx);
586 void ast_block_delete(ast_block*);
587 void ast_block_set_type(ast_block*, ast_expression *from);
588 void ast_block_collect(ast_block*, ast_expression*);
590 bool GMQCC_WARN ast_block_add_expr(ast_block*, ast_expression*);
594 * Contains a list of blocks... at least in theory.
595 * Usually there's just the main block, other blocks are inside that.
597 * Technically, functions don't need to be an AST node, since we have
598 * neither functions inside functions, nor lambdas, and function
599 * pointers could just work with a name. However, this way could be
600 * more flexible, and adds no real complexity.
602 struct ast_function_s
611 ir_function *ir_func;
613 ir_block **breakblocks;
614 ir_block **continueblocks;
617 /* In order for early-out logic not to go over
618 * excessive jumps, we remember their target
626 /* in order for thread safety - for the optional
627 * channel abesed multithreading... keeping a buffer
628 * here to use in ast_function_label.
636 ast_value *fixedparams;
637 ast_value *return_value;
639 ast_function* ast_function_new(lex_ctx ctx, const char *name, ast_value *vtype);
640 /* This will NOT delete the underlying ast_value */
641 void ast_function_delete(ast_function*);
642 /* For "optimized" builds this can just keep returning "foo"...
645 /*const char* ast_function_label(ast_function*, const char *prefix);*/
647 bool ast_function_codegen(ast_function *self, ir_builder *builder);
648 bool ast_generate_accessors(ast_value *asvalue, ir_builder *ir);