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19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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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);
111 /* The codegen functions should store their output values
112 * so we can call it multiple times without re-evaluating.
113 * Store lvalue and rvalue seperately though. So that
114 * ast_entfield for example can generate both if required.
118 } ast_expression_common;
119 MEM_VECTOR_PROTO(ast_expression_common, ast_value*, params);
123 * Types are also values, both have a type and a name.
124 * especially considering possible constructs like typedefs.
126 * is like creating a 'float foo', foo serving as the type's name.
130 ast_expression_common expression;
149 /* usecount for the parser */
155 ast_value* ast_value_new(lex_ctx ctx, const char *name, int qctype);
156 ast_value* ast_value_copy(const ast_value *self);
157 /* This will NOT delete an underlying ast_function */
158 void ast_value_delete(ast_value*);
160 bool ast_value_set_name(ast_value*, const char *name);
162 bool ast_value_codegen(ast_value*, ast_function*, bool lvalue, ir_value**);
163 bool ast_local_codegen(ast_value *self, ir_function *func, bool isparam);
164 bool ast_global_codegen(ast_value *self, ir_builder *ir);
166 bool GMQCC_WARN ast_value_params_add(ast_value*, ast_value*);
168 bool ast_compare_type(ast_expression *a, ast_expression *b);
169 ast_expression* ast_type_copy(lex_ctx ctx, const ast_expression *ex);
170 #define ast_type_adopt(a, b) ast_type_adopt_impl((ast_expression*)(a), (ast_expression*)(b))
171 bool ast_type_adopt_impl(ast_expression *self, const ast_expression *other);
172 void ast_type_to_string(ast_expression *e, char *buf, size_t bufsize);
176 * A value-returning binary expression.
180 ast_expression_common expression;
183 ast_expression *left;
184 ast_expression *right;
186 ast_binary* ast_binary_new(lex_ctx ctx,
188 ast_expression *left,
189 ast_expression *right);
190 void ast_binary_delete(ast_binary*);
192 bool ast_binary_codegen(ast_binary*, ast_function*, bool lvalue, ir_value**);
196 * An assignment including a binary expression with the source as left operand.
197 * Eg. a += b; is a binstore { INSTR_STORE, INSTR_ADD, a, b }
199 struct ast_binstore_s
201 ast_expression_common expression;
205 ast_expression *dest;
206 ast_expression *source;
208 ast_binstore* ast_binstore_new(lex_ctx ctx,
211 ast_expression *left,
212 ast_expression *right);
213 void ast_binstore_delete(ast_binstore*);
215 bool ast_binstore_codegen(ast_binstore*, ast_function*, bool lvalue, ir_value**);
219 * Regular unary expressions: not,neg
223 ast_expression_common expression;
226 ast_expression *operand;
228 ast_unary* ast_unary_new(lex_ctx ctx,
230 ast_expression *expr);
231 void ast_unary_delete(ast_unary*);
233 bool ast_unary_codegen(ast_unary*, ast_function*, bool lvalue, ir_value**);
237 * Make sure 'return' only happens at the end of a block, otherwise the IR
238 * will refuse to create further instructions.
239 * This should be honored by the parser.
243 ast_expression_common expression;
244 ast_expression *operand;
246 ast_return* ast_return_new(lex_ctx ctx,
247 ast_expression *expr);
248 void ast_return_delete(ast_return*);
250 bool ast_return_codegen(ast_return*, ast_function*, bool lvalue, ir_value**);
254 * This must do 2 things:
255 * -) Provide a way to fetch an entity field value. (Rvalue)
256 * -) Provide a pointer to an entity field. (Lvalue)
258 * In original QC, there's only a STORE via pointer, but
259 * no LOAD via pointer.
260 * So we must know beforehand if we are going to read or assign
262 * For this we will have to extend the codegen() functions with
263 * a flag saying whether or not we need an L or an R-value.
265 struct ast_entfield_s
267 ast_expression_common expression;
268 /* The entity can come from an expression of course. */
269 ast_expression *entity;
270 /* As can the field, it just must result in a value of TYPE_FIELD */
271 ast_expression *field;
273 ast_entfield* ast_entfield_new(lex_ctx ctx, ast_expression *entity, ast_expression *field);
274 void ast_entfield_delete(ast_entfield*);
276 bool ast_entfield_codegen(ast_entfield*, ast_function*, bool lvalue, ir_value**);
280 * For now used for vectors. If we get structs or unions
281 * we can have them handled here as well.
285 ast_expression_common expression;
286 ast_expression *owner;
289 ast_member* ast_member_new(lex_ctx ctx, ast_expression *owner, unsigned int field);
290 void ast_member_delete(ast_member*);
292 bool ast_member_codegen(ast_member*, ast_function*, bool lvalue, ir_value**);
296 * Stores left<-right and returns left.
297 * Specialized binary expression node
301 ast_expression_common expression;
303 ast_expression *dest;
304 ast_expression *source;
306 ast_store* ast_store_new(lex_ctx ctx, int op,
307 ast_expression *d, ast_expression *s);
308 void ast_store_delete(ast_store*);
310 bool ast_store_codegen(ast_store*, ast_function*, bool lvalue, ir_value**);
314 * A general 'if then else' statement, either side can be NULL and will
315 * thus be omitted. It is an error for *both* cases to be NULL at once.
317 * During its 'codegen' it'll be changing the ast_function's block.
319 * An if is also an "expression". Its codegen will put NULL into the
320 * output field though. For ternary expressions an ast_ternary will be
325 ast_expression_common expression;
326 ast_expression *cond;
327 /* It's all just 'expressions', since an ast_block is one too. */
328 ast_expression *on_true;
329 ast_expression *on_false;
331 ast_ifthen* ast_ifthen_new(lex_ctx ctx, ast_expression *cond, ast_expression *ontrue, ast_expression *onfalse);
332 void ast_ifthen_delete(ast_ifthen*);
334 bool ast_ifthen_codegen(ast_ifthen*, ast_function*, bool lvalue, ir_value**);
336 /* Ternary expressions...
338 * Contrary to 'if-then-else' nodes, ternary expressions actually
339 * return a value, otherwise they behave the very same way.
340 * The difference in 'codegen' is that it'll return the value of
343 * The other difference is that in an ast_ternary, NEITHER side
344 * must be NULL, there's ALWAYS an else branch.
346 * This is the only ast_node beside ast_value which contains
347 * an ir_value. Theoretically we don't need to remember it though.
351 ast_expression_common expression;
352 ast_expression *cond;
353 /* It's all just 'expressions', since an ast_block is one too. */
354 ast_expression *on_true;
355 ast_expression *on_false;
356 /* After a ternary expression we find ourselves in a new IR block
357 * and start with a PHI node */
360 ast_ternary* ast_ternary_new(lex_ctx ctx, ast_expression *cond, ast_expression *ontrue, ast_expression *onfalse);
361 void ast_ternary_delete(ast_ternary*);
363 bool ast_ternary_codegen(ast_ternary*, ast_function*, bool lvalue, ir_value**);
365 /* A general loop node
367 * For convenience it contains 4 parts:
368 * -) (ini) = initializing expression
369 * -) (pre) = pre-loop condition
370 * -) (pst) = post-loop condition
371 * -) (inc) = "increment" expression
372 * The following is a psudo-representation of this loop
373 * note that '=>' bears the logical meaning of "implies".
374 * (a => b) equals (!a || b)
377 while (has_pre => {pre})
381 continue: // a 'continue' will jump here
382 if (has_pst => {pst})
390 ast_expression_common expression;
391 ast_expression *initexpr;
392 ast_expression *precond;
393 ast_expression *postcond;
394 ast_expression *increment;
395 ast_expression *body;
397 ast_loop* ast_loop_new(lex_ctx ctx,
398 ast_expression *initexpr,
399 ast_expression *precond,
400 ast_expression *postcond,
401 ast_expression *increment,
402 ast_expression *body);
403 void ast_loop_delete(ast_loop*);
405 bool ast_loop_codegen(ast_loop*, ast_function*, bool lvalue, ir_value**);
409 * Contains an ast_expression as target, rather than an ast_function/value.
410 * Since it's how QC works, every ast_function has an ast_value
411 * associated anyway - in other words, the VM contains function
412 * pointers for every function anyway. Thus, this node will call
414 * Additionally it contains a list of ast_expressions as parameters.
415 * Since calls can return values, an ast_call is also an ast_expression.
419 ast_expression_common expression;
420 ast_expression *func;
421 MEM_VECTOR_MAKE(ast_expression*, params);
423 ast_call* ast_call_new(lex_ctx ctx,
424 ast_expression *funcexpr);
425 void ast_call_delete(ast_call*);
426 bool ast_call_codegen(ast_call*, ast_function*, bool lvalue, ir_value**);
427 bool ast_call_check_types(ast_call*);
429 MEM_VECTOR_PROTO(ast_call, ast_expression*, params);
436 ast_expression_common expression;
438 MEM_VECTOR_MAKE(ast_value*, locals);
439 MEM_VECTOR_MAKE(ast_expression*, exprs);
440 MEM_VECTOR_MAKE(ast_expression*, collect);
442 ast_block* ast_block_new(lex_ctx ctx);
443 void ast_block_delete(ast_block*);
444 bool ast_block_set_type(ast_block*, ast_expression *from);
446 MEM_VECTOR_PROTO(ast_block, ast_value*, locals);
447 MEM_VECTOR_PROTO(ast_block, ast_expression*, exprs);
448 MEM_VECTOR_PROTO(ast_block, ast_expression*, collect);
450 bool ast_block_codegen(ast_block*, ast_function*, bool lvalue, ir_value**);
451 bool ast_block_collect(ast_block*, ast_expression*);
455 * Contains a list of blocks... at least in theory.
456 * Usually there's just the main block, other blocks are inside that.
458 * Technically, functions don't need to be an AST node, since we have
459 * neither functions inside functions, nor lambdas, and function
460 * pointers could just work with a name. However, this way could be
461 * more flexible, and adds no real complexity.
463 struct ast_function_s
465 ast_node_common node;
472 ir_function *ir_func;
474 ir_block *breakblock;
475 ir_block *continueblock;
478 /* in order for thread safety - for the optional
479 * channel abesed multithreading... keeping a buffer
480 * here to use in ast_function_label.
484 MEM_VECTOR_MAKE(ast_block*, blocks);
486 ast_function* ast_function_new(lex_ctx ctx, const char *name, ast_value *vtype);
487 /* This will NOT delete the underlying ast_value */
488 void ast_function_delete(ast_function*);
489 /* For "optimized" builds this can just keep returning "foo"...
492 const char* ast_function_label(ast_function*, const char *prefix);
494 MEM_VECTOR_PROTO(ast_function, ast_block*, blocks);
496 bool ast_function_codegen(ast_function *self, ir_builder *builder);
500 union ast_expression_u
502 ast_expression_common expression;
510 ast_entfield entfield;
517 ast_node_common node;
518 ast_expression expression;