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27 /* Note: I will not be using a _t suffix for the
28 * "main" ast node types for now.
31 typedef union ast_node_u ast_node;
32 typedef union ast_expression_u ast_expression;
34 typedef struct ast_value_s ast_value;
35 typedef struct ast_function_s ast_function;
36 typedef struct ast_block_s ast_block;
37 typedef struct ast_binary_s ast_binary;
38 typedef struct ast_store_s ast_store;
39 typedef struct ast_binstore_s ast_binstore;
40 typedef struct ast_entfield_s ast_entfield;
41 typedef struct ast_ifthen_s ast_ifthen;
42 typedef struct ast_ternary_s ast_ternary;
43 typedef struct ast_loop_s ast_loop;
44 typedef struct ast_call_s ast_call;
45 typedef struct ast_unary_s ast_unary;
46 typedef struct ast_return_s ast_return;
47 typedef struct ast_member_s ast_member;
68 #define ast_istype(x, t) ( ((ast_node_common*)x)->nodetype == (TYPE_##t) )
69 #define ast_ctx(node) (((ast_node_common*)(node))->context)
71 /* Node interface with common components
73 typedef void ast_node_delete(ast_node*);
77 /* I don't feel comfortable using keywords like 'delete' as names... */
78 ast_node_delete *destroy;
80 /* keep: if a node contains this node, 'keep'
81 * prevents its dtor from destroying this node as well.
86 #define ast_delete(x) ( ( (ast_node*)(x) ) -> node.destroy )((ast_node*)(x))
87 #define ast_unref(x) do \
89 if (! (((ast_node*)(x))->node.keep) ) { \
94 /* Expression interface
96 * Any expression or block returns an ir_value, and needs
97 * to know the current function.
99 typedef bool ast_expression_codegen(ast_expression*,
105 ast_node_common node;
106 ast_expression_codegen *codegen;
108 ast_expression *next;
109 MEM_VECTOR_MAKE(ast_value*, params);
110 /* The codegen functions should store their output values
111 * so we can call it multiple times without re-evaluating.
112 * Store lvalue and rvalue seperately though. So that
113 * ast_entfield for example can generate both if required.
117 } ast_expression_common;
118 MEM_VECTOR_PROTO(ast_expression_common, ast_value*, params);
122 * Types are also values, both have a type and a name.
123 * especially considering possible constructs like typedefs.
125 * is like creating a 'float foo', foo serving as the type's name.
129 ast_expression_common expression;
151 ast_value* ast_value_new(lex_ctx ctx, const char *name, int qctype);
152 /* This will NOT delete an underlying ast_function */
153 void ast_value_delete(ast_value*);
155 bool ast_value_set_name(ast_value*, const char *name);
157 bool ast_value_codegen(ast_value*, ast_function*, bool lvalue, ir_value**);
158 bool ast_local_codegen(ast_value *self, ir_function *func, bool isparam);
159 bool ast_global_codegen(ast_value *self, ir_builder *ir);
161 bool GMQCC_WARN ast_value_params_add(ast_value*, ast_value*);
163 bool ast_compare_type(ast_expression *a, ast_expression *b);
167 * A value-returning binary expression.
171 ast_expression_common expression;
174 ast_expression *left;
175 ast_expression *right;
177 ast_binary* ast_binary_new(lex_ctx ctx,
179 ast_expression *left,
180 ast_expression *right);
181 void ast_binary_delete(ast_binary*);
183 bool ast_binary_codegen(ast_binary*, ast_function*, bool lvalue, ir_value**);
187 * An assignment including a binary expression with the source as left operand.
188 * Eg. a += b; is a binstore { INSTR_STORE, INSTR_ADD, a, b }
190 struct ast_binstore_s
192 ast_expression_common expression;
196 ast_expression *dest;
197 ast_expression *source;
199 ast_binstore* ast_binstore_new(lex_ctx ctx,
202 ast_expression *left,
203 ast_expression *right);
204 void ast_binstore_delete(ast_binstore*);
206 bool ast_binstore_codegen(ast_binstore*, ast_function*, bool lvalue, ir_value**);
210 * Regular unary expressions: not,neg
214 ast_expression_common expression;
217 ast_expression *operand;
219 ast_unary* ast_unary_new(lex_ctx ctx,
221 ast_expression *expr);
222 void ast_unary_delete(ast_unary*);
224 bool ast_unary_codegen(ast_unary*, ast_function*, bool lvalue, ir_value**);
228 * Make sure 'return' only happens at the end of a block, otherwise the IR
229 * will refuse to create further instructions.
230 * This should be honored by the parser.
234 ast_expression_common expression;
235 ast_expression *operand;
237 ast_return* ast_return_new(lex_ctx ctx,
238 ast_expression *expr);
239 void ast_return_delete(ast_return*);
241 bool ast_return_codegen(ast_return*, ast_function*, bool lvalue, ir_value**);
245 * This must do 2 things:
246 * -) Provide a way to fetch an entity field value. (Rvalue)
247 * -) Provide a pointer to an entity field. (Lvalue)
249 * In original QC, there's only a STORE via pointer, but
250 * no LOAD via pointer.
251 * So we must know beforehand if we are going to read or assign
253 * For this we will have to extend the codegen() functions with
254 * a flag saying whether or not we need an L or an R-value.
256 struct ast_entfield_s
258 ast_expression_common expression;
259 /* The entity can come from an expression of course. */
260 ast_expression *entity;
261 /* As can the field, it just must result in a value of TYPE_FIELD */
262 ast_expression *field;
264 ast_entfield* ast_entfield_new(lex_ctx ctx, ast_expression *entity, ast_expression *field);
265 void ast_entfield_delete(ast_entfield*);
267 bool ast_entfield_codegen(ast_entfield*, ast_function*, bool lvalue, ir_value**);
271 * For now used for vectors. If we get structs or unions
272 * we can have them handled here as well.
276 ast_expression_common expression;
277 ast_expression *owner;
280 ast_member* ast_member_new(lex_ctx ctx, ast_expression *owner, unsigned int field);
281 void ast_member_delete(ast_member*);
283 bool ast_member_codegen(ast_member*, ast_function*, bool lvalue, ir_value**);
287 * Stores left<-right and returns left.
288 * Specialized binary expression node
292 ast_expression_common expression;
294 ast_expression *dest;
295 ast_expression *source;
297 ast_store* ast_store_new(lex_ctx ctx, int op,
298 ast_expression *d, ast_expression *s);
299 void ast_store_delete(ast_store*);
301 bool ast_store_codegen(ast_store*, ast_function*, bool lvalue, ir_value**);
305 * A general 'if then else' statement, either side can be NULL and will
306 * thus be omitted. It is an error for *both* cases to be NULL at once.
308 * During its 'codegen' it'll be changing the ast_function's block.
310 * An if is also an "expression". Its codegen will put NULL into the
311 * output field though. For ternary expressions an ast_ternary will be
316 ast_expression_common expression;
317 ast_expression *cond;
318 /* It's all just 'expressions', since an ast_block is one too. */
319 ast_expression *on_true;
320 ast_expression *on_false;
322 ast_ifthen* ast_ifthen_new(lex_ctx ctx, ast_expression *cond, ast_expression *ontrue, ast_expression *onfalse);
323 void ast_ifthen_delete(ast_ifthen*);
325 bool ast_ifthen_codegen(ast_ifthen*, ast_function*, bool lvalue, ir_value**);
327 /* Ternary expressions...
329 * Contrary to 'if-then-else' nodes, ternary expressions actually
330 * return a value, otherwise they behave the very same way.
331 * The difference in 'codegen' is that it'll return the value of
334 * The other difference is that in an ast_ternary, NEITHER side
335 * must be NULL, there's ALWAYS an else branch.
337 * This is the only ast_node beside ast_value which contains
338 * an ir_value. Theoretically we don't need to remember it though.
342 ast_expression_common expression;
343 ast_expression *cond;
344 /* It's all just 'expressions', since an ast_block is one too. */
345 ast_expression *on_true;
346 ast_expression *on_false;
347 /* After a ternary expression we find ourselves in a new IR block
348 * and start with a PHI node */
351 ast_ternary* ast_ternary_new(lex_ctx ctx, ast_expression *cond, ast_expression *ontrue, ast_expression *onfalse);
352 void ast_ternary_delete(ast_ternary*);
354 bool ast_ternary_codegen(ast_ternary*, ast_function*, bool lvalue, ir_value**);
356 /* A general loop node
358 * For convenience it contains 4 parts:
359 * -) (ini) = initializing expression
360 * -) (pre) = pre-loop condition
361 * -) (pst) = post-loop condition
362 * -) (inc) = "increment" expression
363 * The following is a psudo-representation of this loop
364 * note that '=>' bears the logical meaning of "implies".
365 * (a => b) equals (!a || b)
368 while (has_pre => {pre})
372 continue: // a 'continue' will jump here
373 if (has_pst => {pst})
381 ast_expression_common expression;
382 ast_expression *initexpr;
383 ast_expression *precond;
384 ast_expression *postcond;
385 ast_expression *increment;
386 ast_expression *body;
388 ast_loop* ast_loop_new(lex_ctx ctx,
389 ast_expression *initexpr,
390 ast_expression *precond,
391 ast_expression *postcond,
392 ast_expression *increment,
393 ast_expression *body);
394 void ast_loop_delete(ast_loop*);
396 bool ast_loop_codegen(ast_loop*, ast_function*, bool lvalue, ir_value**);
400 * Contains an ast_expression as target, rather than an ast_function/value.
401 * Since it's how QC works, every ast_function has an ast_value
402 * associated anyway - in other words, the VM contains function
403 * pointers for every function anyway. Thus, this node will call
405 * Additionally it contains a list of ast_expressions as parameters.
406 * Since calls can return values, an ast_call is also an ast_expression.
410 ast_expression_common expression;
411 ast_expression *func;
412 MEM_VECTOR_MAKE(ast_expression*, params);
414 ast_call* ast_call_new(lex_ctx ctx,
415 ast_expression *funcexpr);
416 void ast_call_delete(ast_call*);
417 bool ast_call_codegen(ast_call*, ast_function*, bool lvalue, ir_value**);
419 MEM_VECTOR_PROTO(ast_call, ast_expression*, params);
426 ast_expression_common expression;
428 MEM_VECTOR_MAKE(ast_value*, locals);
429 MEM_VECTOR_MAKE(ast_expression*, exprs);
431 ast_block* ast_block_new(lex_ctx ctx);
432 void ast_block_delete(ast_block*);
433 bool ast_block_set_type(ast_block*, ast_expression *from);
435 MEM_VECTOR_PROTO(ast_block, ast_value*, locals);
436 MEM_VECTOR_PROTO(ast_block, ast_expression*, exprs);
438 bool ast_block_codegen(ast_block*, ast_function*, bool lvalue, ir_value**);
442 * Contains a list of blocks... at least in theory.
443 * Usually there's just the main block, other blocks are inside that.
445 * Technically, functions don't need to be an AST node, since we have
446 * neither functions inside functions, nor lambdas, and function
447 * pointers could just work with a name. However, this way could be
448 * more flexible, and adds no real complexity.
450 struct ast_function_s
452 ast_node_common node;
459 ir_function *ir_func;
461 ir_block *breakblock;
462 ir_block *continueblock;
465 /* in order for thread safety - for the optional
466 * channel abesed multithreading... keeping a buffer
467 * here to use in ast_function_label.
471 MEM_VECTOR_MAKE(ast_block*, blocks);
473 ast_function* ast_function_new(lex_ctx ctx, const char *name, ast_value *vtype);
474 /* This will NOT delete the underlying ast_value */
475 void ast_function_delete(ast_function*);
476 /* For "optimized" builds this can just keep returning "foo"...
479 const char* ast_function_label(ast_function*, const char *prefix);
481 MEM_VECTOR_PROTO(ast_function, ast_block*, blocks);
483 bool ast_function_codegen(ast_function *self, ir_builder *builder);
487 union ast_expression_u
489 ast_expression_common expression;
497 ast_entfield entfield;
504 ast_node_common node;
505 ast_expression expression;