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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;
64 #define ast_istype(x, t) ( ((ast_node_common*)x)->nodetype == (t) )
66 /* Node interface with common components
68 typedef void ast_node_delete(ast_node*);
72 /* I don't feel comfortable using keywords like 'delete' as names... */
73 ast_node_delete *destroy;
75 /* keep: if a node contains this node, 'keep'
76 * prevents its dtor from destroying this node as well.
81 #define ast_delete(x) ( ( (ast_node*)(x) ) -> node.destroy )((ast_node*)(x))
82 #define ast_unref(x) do \
84 if (! (((ast_node*)(x))->node.keep) ) { \
89 /* Expression interface
91 * Any expression or block returns an ir_value, and needs
92 * to know the current function.
94 typedef bool ast_expression_codegen(ast_expression*,
100 ast_node_common node;
101 ast_expression_codegen *codegen;
103 ast_expression *next;
104 MEM_VECTOR_MAKE(ast_value*, params);
105 } ast_expression_common;
106 MEM_VECTOR_PROTO(ast_expression_common, ast_value*, params);
110 * Types are also values, both have a type and a name.
111 * especially considering possible constructs like typedefs.
113 * is like creating a 'float foo', foo serving as the type's name.
117 ast_expression_common expression;
139 ast_value* ast_value_new(lex_ctx ctx, const char *name, int qctype);
140 /* This will NOT delete an underlying ast_function */
141 void ast_value_delete(ast_value*);
143 bool ast_value_set_name(ast_value*, const char *name);
145 bool ast_value_codegen(ast_value*, ast_function*, bool lvalue, ir_value**);
146 bool ast_local_codegen(ast_value *self, ir_function *func, bool isparam);
147 bool ast_global_codegen(ast_value *self, ir_builder *ir);
149 bool GMQCC_WARN ast_value_params_add(ast_value*, ast_value*);
153 * A value-returning binary expression.
157 ast_expression_common expression;
160 ast_expression *left;
161 ast_expression *right;
163 ast_binary* ast_binary_new(lex_ctx ctx,
165 ast_expression *left,
166 ast_expression *right);
167 void ast_binary_delete(ast_binary*);
169 bool ast_binary_codegen(ast_binary*, ast_function*, bool lvalue, ir_value**);
173 * Regular unary expressions: not,neg
177 ast_expression_common expression;
180 ast_expression *operand;
182 ast_unary* ast_unary_new(lex_ctx ctx,
184 ast_expression *expr);
185 void ast_unary_delete(ast_unary*);
187 bool ast_unary_codegen(ast_unary*, ast_function*, bool lvalue, ir_value**);
191 * Make sure 'return' only happens at the end of a block, otherwise the IR
192 * will refuse to create further instructions.
193 * This should be honored by the parser.
197 ast_expression_common expression;
198 ast_expression *operand;
200 ast_return* ast_return_new(lex_ctx ctx,
201 ast_expression *expr);
202 void ast_return_delete(ast_return*);
204 bool ast_return_codegen(ast_return*, ast_function*, bool lvalue, ir_value**);
208 * This must do 2 things:
209 * -) Provide a way to fetch an entity field value. (Rvalue)
210 * -) Provide a pointer to an entity field. (Lvalue)
212 * In original QC, there's only a STORE via pointer, but
213 * no LOAD via pointer.
214 * So we must know beforehand if we are going to read or assign
216 * For this we will have to extend the codegen() functions with
217 * a flag saying whether or not we need an L or an R-value.
219 struct ast_entfield_s
221 ast_expression_common expression;
222 /* The entity can come from an expression of course. */
223 ast_expression *entity;
224 /* As can the field, it just must result in a value of TYPE_FIELD */
225 ast_expression *field;
227 ast_entfield* ast_entfield_new(lex_ctx ctx, ast_expression *entity, ast_expression *field);
228 void ast_entfield_delete(ast_entfield*);
230 bool ast_entfield_codegen(ast_entfield*, ast_function*, bool lvalue, ir_value**);
234 * Stores left<-right and returns left.
235 * Specialized binary expression node
239 ast_expression_common expression;
241 ast_expression *dest;
242 ast_expression *source;
244 ast_store* ast_store_new(lex_ctx ctx, int op,
245 ast_expression *d, ast_expression *s);
246 void ast_store_delete(ast_store*);
248 bool ast_store_codegen(ast_store*, ast_function*, bool lvalue, ir_value**);
252 * A general 'if then else' statement, either side can be NULL and will
253 * thus be omitted. It is an error for *both* cases to be NULL at once.
255 * During its 'codegen' it'll be changing the ast_function's block.
257 * An if is also an "expression". Its codegen will put NULL into the
258 * output field though. For ternary expressions an ast_ternary will be
263 ast_expression_common expression;
264 ast_expression *cond;
265 /* It's all just 'expressions', since an ast_block is one too. */
266 ast_expression *on_true;
267 ast_expression *on_false;
269 ast_ifthen* ast_ifthen_new(lex_ctx ctx, ast_expression *cond, ast_expression *ontrue, ast_expression *onfalse);
270 void ast_ifthen_delete(ast_ifthen*);
272 bool ast_ifthen_codegen(ast_ifthen*, ast_function*, bool lvalue, ir_value**);
274 /* Ternary expressions...
276 * Contrary to 'if-then-else' nodes, ternary expressions actually
277 * return a value, otherwise they behave the very same way.
278 * The difference in 'codegen' is that it'll return the value of
281 * The other difference is that in an ast_ternary, NEITHER side
282 * must be NULL, there's ALWAYS an else branch.
284 * This is the only ast_node beside ast_value which contains
285 * an ir_value. Theoretically we don't need to remember it though.
289 ast_expression_common expression;
290 ast_expression *cond;
291 /* It's all just 'expressions', since an ast_block is one too. */
292 ast_expression *on_true;
293 ast_expression *on_false;
294 /* After a ternary expression we find ourselves in a new IR block
295 * and start with a PHI node */
298 ast_ternary* ast_ternary_new(lex_ctx ctx, ast_expression *cond, ast_expression *ontrue, ast_expression *onfalse);
299 void ast_ternary_delete(ast_ternary*);
301 bool ast_ternary_codegen(ast_ternary*, ast_function*, bool lvalue, ir_value**);
303 /* A general loop node
305 * For convenience it contains 4 parts:
306 * -) (ini) = initializing expression
307 * -) (pre) = pre-loop condition
308 * -) (pst) = post-loop condition
309 * -) (inc) = "increment" expression
310 * The following is a psudo-representation of this loop
311 * note that '=>' bears the logical meaning of "implies".
312 * (a => b) equals (!a || b)
315 while (has_pre => {pre})
319 continue: // a 'continue' will jump here
320 if (has_pst => {pst})
328 ast_expression_common expression;
329 ast_expression *initexpr;
330 ast_expression *precond;
331 ast_expression *postcond;
332 ast_expression *increment;
333 ast_expression *body;
335 ast_loop* ast_loop_new(lex_ctx ctx,
336 ast_expression *initexpr,
337 ast_expression *precond,
338 ast_expression *postcond,
339 ast_expression *increment,
340 ast_expression *body);
341 void ast_loop_delete(ast_loop*);
343 bool ast_loop_codegen(ast_loop*, ast_function*, bool lvalue, ir_value**);
347 * Contains an ast_expression as target, rather than an ast_function/value.
348 * Since it's how QC works, every ast_function has an ast_value
349 * associated anyway - in other words, the VM contains function
350 * pointers for every function anyway. Thus, this node will call
352 * Additionally it contains a list of ast_expressions as parameters.
353 * Since calls can return values, an ast_call is also an ast_expression.
357 ast_expression_common expression;
358 ast_expression *func;
359 MEM_VECTOR_MAKE(ast_expression*, params);
361 ast_call* ast_call_new(lex_ctx ctx,
362 ast_expression *funcexpr);
363 void ast_call_delete(ast_call*);
364 bool ast_call_codegen(ast_call*, ast_function*, bool lvalue, ir_value**);
366 MEM_VECTOR_PROTO(ast_call, ast_expression*, params);
373 ast_expression_common expression;
375 MEM_VECTOR_MAKE(ast_value*, locals);
376 MEM_VECTOR_MAKE(ast_expression*, exprs);
378 ast_block* ast_block_new(lex_ctx ctx);
379 void ast_block_delete(ast_block*);
380 bool ast_block_set_type(ast_block*, ast_expression *from);
382 MEM_VECTOR_PROTO(ast_block, ast_value*, locals);
383 MEM_VECTOR_PROTO(ast_block, ast_expression*, exprs);
385 bool ast_block_codegen(ast_block*, ast_function*, bool lvalue, ir_value**);
389 * Contains a list of blocks... at least in theory.
390 * Usually there's just the main block, other blocks are inside that.
392 * Technically, functions don't need to be an AST node, since we have
393 * neither functions inside functions, nor lambdas, and function
394 * pointers could just work with a name. However, this way could be
395 * more flexible, and adds no real complexity.
397 struct ast_function_s
399 ast_node_common node;
406 ir_function *ir_func;
408 ir_block *breakblock;
409 ir_block *continueblock;
412 /* in order for thread safety - for the optional
413 * channel abesed multithreading... keeping a buffer
414 * here to use in ast_function_label.
418 MEM_VECTOR_MAKE(ast_block*, blocks);
420 ast_function* ast_function_new(lex_ctx ctx, const char *name, ast_value *vtype);
421 /* This will NOT delete the underlying ast_value */
422 void ast_function_delete(ast_function*);
423 /* For "optimized" builds this can just keep returning "foo"...
426 const char* ast_function_label(ast_function*, const char *prefix);
428 MEM_VECTOR_PROTO(ast_function, ast_block*, blocks);
430 bool ast_function_codegen(ast_function *self, ir_builder *builder);
434 union ast_expression_u
436 ast_expression_common expression;
444 ast_entfield entfield;
451 ast_node_common node;
452 ast_expression expression;