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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_entfield_s ast_entfield;
40 typedef struct ast_ifthen_s ast_ifthen;
41 typedef struct ast_ternary_s ast_ternary;
42 typedef struct ast_loop_s ast_loop;
43 typedef struct ast_call_s ast_call;
44 typedef struct ast_unary_s ast_unary;
45 typedef struct ast_return_s ast_return;
46 typedef struct ast_member_s ast_member;
66 #define ast_istype(x, t) ( ((ast_node_common*)x)->nodetype == (t) )
68 /* Node interface with common components
70 typedef void ast_node_delete(ast_node*);
74 /* I don't feel comfortable using keywords like 'delete' as names... */
75 ast_node_delete *destroy;
77 /* keep: if a node contains this node, 'keep'
78 * prevents its dtor from destroying this node as well.
83 #define ast_delete(x) ( ( (ast_node*)(x) ) -> node.destroy )((ast_node*)(x))
84 #define ast_unref(x) do \
86 if (! (((ast_node*)(x))->node.keep) ) { \
91 /* Expression interface
93 * Any expression or block returns an ir_value, and needs
94 * to know the current function.
96 typedef bool ast_expression_codegen(ast_expression*,
102 ast_node_common node;
103 ast_expression_codegen *codegen;
105 ast_expression *next;
106 MEM_VECTOR_MAKE(ast_value*, params);
107 } ast_expression_common;
108 MEM_VECTOR_PROTO(ast_expression_common, ast_value*, params);
112 * Types are also values, both have a type and a name.
113 * especially considering possible constructs like typedefs.
115 * is like creating a 'float foo', foo serving as the type's name.
119 ast_expression_common expression;
141 ast_value* ast_value_new(lex_ctx ctx, const char *name, int qctype);
142 /* This will NOT delete an underlying ast_function */
143 void ast_value_delete(ast_value*);
145 bool ast_value_set_name(ast_value*, const char *name);
147 bool ast_value_codegen(ast_value*, ast_function*, bool lvalue, ir_value**);
148 bool ast_local_codegen(ast_value *self, ir_function *func, bool isparam);
149 bool ast_global_codegen(ast_value *self, ir_builder *ir);
151 bool GMQCC_WARN ast_value_params_add(ast_value*, ast_value*);
155 * A value-returning binary expression.
159 ast_expression_common expression;
162 ast_expression *left;
163 ast_expression *right;
165 ast_binary* ast_binary_new(lex_ctx ctx,
167 ast_expression *left,
168 ast_expression *right);
169 void ast_binary_delete(ast_binary*);
171 bool ast_binary_codegen(ast_binary*, ast_function*, bool lvalue, ir_value**);
175 * Regular unary expressions: not,neg
179 ast_expression_common expression;
182 ast_expression *operand;
184 ast_unary* ast_unary_new(lex_ctx ctx,
186 ast_expression *expr);
187 void ast_unary_delete(ast_unary*);
189 bool ast_unary_codegen(ast_unary*, ast_function*, bool lvalue, ir_value**);
193 * Make sure 'return' only happens at the end of a block, otherwise the IR
194 * will refuse to create further instructions.
195 * This should be honored by the parser.
199 ast_expression_common expression;
200 ast_expression *operand;
202 ast_return* ast_return_new(lex_ctx ctx,
203 ast_expression *expr);
204 void ast_return_delete(ast_return*);
206 bool ast_return_codegen(ast_return*, ast_function*, bool lvalue, ir_value**);
210 * This must do 2 things:
211 * -) Provide a way to fetch an entity field value. (Rvalue)
212 * -) Provide a pointer to an entity field. (Lvalue)
214 * In original QC, there's only a STORE via pointer, but
215 * no LOAD via pointer.
216 * So we must know beforehand if we are going to read or assign
218 * For this we will have to extend the codegen() functions with
219 * a flag saying whether or not we need an L or an R-value.
221 struct ast_entfield_s
223 ast_expression_common expression;
224 /* The entity can come from an expression of course. */
225 ast_expression *entity;
226 /* As can the field, it just must result in a value of TYPE_FIELD */
227 ast_expression *field;
229 ast_entfield* ast_entfield_new(lex_ctx ctx, ast_expression *entity, ast_expression *field);
230 void ast_entfield_delete(ast_entfield*);
232 bool ast_entfield_codegen(ast_entfield*, ast_function*, bool lvalue, ir_value**);
236 * For now used for vectors. If we get structs or unions
237 * we can have them handled here as well.
241 ast_expression_common expression;
242 ast_expression *owner;
245 ast_member* ast_member_new(lex_ctx ctx, ast_expression *owner, unsigned int field);
246 void ast_member_delete(ast_member*);
248 bool ast_member_codegen(ast_member*, ast_function*, bool lvalue, ir_value**);
252 * Stores left<-right and returns left.
253 * Specialized binary expression node
257 ast_expression_common expression;
259 ast_expression *dest;
260 ast_expression *source;
262 ast_store* ast_store_new(lex_ctx ctx, int op,
263 ast_expression *d, ast_expression *s);
264 void ast_store_delete(ast_store*);
266 bool ast_store_codegen(ast_store*, ast_function*, bool lvalue, ir_value**);
270 * A general 'if then else' statement, either side can be NULL and will
271 * thus be omitted. It is an error for *both* cases to be NULL at once.
273 * During its 'codegen' it'll be changing the ast_function's block.
275 * An if is also an "expression". Its codegen will put NULL into the
276 * output field though. For ternary expressions an ast_ternary will be
281 ast_expression_common expression;
282 ast_expression *cond;
283 /* It's all just 'expressions', since an ast_block is one too. */
284 ast_expression *on_true;
285 ast_expression *on_false;
287 ast_ifthen* ast_ifthen_new(lex_ctx ctx, ast_expression *cond, ast_expression *ontrue, ast_expression *onfalse);
288 void ast_ifthen_delete(ast_ifthen*);
290 bool ast_ifthen_codegen(ast_ifthen*, ast_function*, bool lvalue, ir_value**);
292 /* Ternary expressions...
294 * Contrary to 'if-then-else' nodes, ternary expressions actually
295 * return a value, otherwise they behave the very same way.
296 * The difference in 'codegen' is that it'll return the value of
299 * The other difference is that in an ast_ternary, NEITHER side
300 * must be NULL, there's ALWAYS an else branch.
302 * This is the only ast_node beside ast_value which contains
303 * an ir_value. Theoretically we don't need to remember it though.
307 ast_expression_common expression;
308 ast_expression *cond;
309 /* It's all just 'expressions', since an ast_block is one too. */
310 ast_expression *on_true;
311 ast_expression *on_false;
312 /* After a ternary expression we find ourselves in a new IR block
313 * and start with a PHI node */
316 ast_ternary* ast_ternary_new(lex_ctx ctx, ast_expression *cond, ast_expression *ontrue, ast_expression *onfalse);
317 void ast_ternary_delete(ast_ternary*);
319 bool ast_ternary_codegen(ast_ternary*, ast_function*, bool lvalue, ir_value**);
321 /* A general loop node
323 * For convenience it contains 4 parts:
324 * -) (ini) = initializing expression
325 * -) (pre) = pre-loop condition
326 * -) (pst) = post-loop condition
327 * -) (inc) = "increment" expression
328 * The following is a psudo-representation of this loop
329 * note that '=>' bears the logical meaning of "implies".
330 * (a => b) equals (!a || b)
333 while (has_pre => {pre})
337 continue: // a 'continue' will jump here
338 if (has_pst => {pst})
346 ast_expression_common expression;
347 ast_expression *initexpr;
348 ast_expression *precond;
349 ast_expression *postcond;
350 ast_expression *increment;
351 ast_expression *body;
353 ast_loop* ast_loop_new(lex_ctx ctx,
354 ast_expression *initexpr,
355 ast_expression *precond,
356 ast_expression *postcond,
357 ast_expression *increment,
358 ast_expression *body);
359 void ast_loop_delete(ast_loop*);
361 bool ast_loop_codegen(ast_loop*, ast_function*, bool lvalue, ir_value**);
365 * Contains an ast_expression as target, rather than an ast_function/value.
366 * Since it's how QC works, every ast_function has an ast_value
367 * associated anyway - in other words, the VM contains function
368 * pointers for every function anyway. Thus, this node will call
370 * Additionally it contains a list of ast_expressions as parameters.
371 * Since calls can return values, an ast_call is also an ast_expression.
375 ast_expression_common expression;
376 ast_expression *func;
377 MEM_VECTOR_MAKE(ast_expression*, params);
379 ast_call* ast_call_new(lex_ctx ctx,
380 ast_expression *funcexpr);
381 void ast_call_delete(ast_call*);
382 bool ast_call_codegen(ast_call*, ast_function*, bool lvalue, ir_value**);
384 MEM_VECTOR_PROTO(ast_call, ast_expression*, params);
391 ast_expression_common expression;
393 MEM_VECTOR_MAKE(ast_value*, locals);
394 MEM_VECTOR_MAKE(ast_expression*, exprs);
396 ast_block* ast_block_new(lex_ctx ctx);
397 void ast_block_delete(ast_block*);
398 bool ast_block_set_type(ast_block*, ast_expression *from);
400 MEM_VECTOR_PROTO(ast_block, ast_value*, locals);
401 MEM_VECTOR_PROTO(ast_block, ast_expression*, exprs);
403 bool ast_block_codegen(ast_block*, ast_function*, bool lvalue, ir_value**);
407 * Contains a list of blocks... at least in theory.
408 * Usually there's just the main block, other blocks are inside that.
410 * Technically, functions don't need to be an AST node, since we have
411 * neither functions inside functions, nor lambdas, and function
412 * pointers could just work with a name. However, this way could be
413 * more flexible, and adds no real complexity.
415 struct ast_function_s
417 ast_node_common node;
424 ir_function *ir_func;
426 ir_block *breakblock;
427 ir_block *continueblock;
430 /* in order for thread safety - for the optional
431 * channel abesed multithreading... keeping a buffer
432 * here to use in ast_function_label.
436 MEM_VECTOR_MAKE(ast_block*, blocks);
438 ast_function* ast_function_new(lex_ctx ctx, const char *name, ast_value *vtype);
439 /* This will NOT delete the underlying ast_value */
440 void ast_function_delete(ast_function*);
441 /* For "optimized" builds this can just keep returning "foo"...
444 const char* ast_function_label(ast_function*, const char *prefix);
446 MEM_VECTOR_PROTO(ast_function, ast_block*, blocks);
448 bool ast_function_codegen(ast_function *self, ir_builder *builder);
452 union ast_expression_u
454 ast_expression_common expression;
462 ast_entfield entfield;
469 ast_node_common node;
470 ast_expression expression;