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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;
45 /* Node interface with common components
47 typedef void ast_node_delete(ast_node*);
51 /* I don't feel comfortable using keywords like 'delete' as names... */
52 ast_node_delete *destroy;
53 /* keep: if a node contains this node, 'keep'
54 * prevents its dtor from destroying this node as well.
59 #define ast_delete(x) ( ( (ast_node*)(x) ) -> node.destroy )((ast_node*)(x))
60 #define ast_unref(x) do \
62 if (! (((ast_node*)(x))->node.keep) ) { \
67 /* Expression interface
69 * Any expression or block returns an ir_value, and needs
70 * to know the current function.
72 typedef bool ast_expression_codegen(ast_expression*,
79 ast_expression_codegen *codegen;
82 } ast_expression_common;
86 * Types are also values, both have a type and a name.
87 * especially considering possible constructs like typedefs.
89 * is like creating a 'float foo', foo serving as the type's name.
93 ast_expression_common expression;
116 /* if vtype is qc_function, params contain parameters, and
117 * 'next' the return type.
119 MEM_VECTOR_MAKE(ast_value*, params);
121 MEM_VECTOR_PROTO(ast_value, ast_value*, params);
123 ast_value* ast_value_new(lex_ctx ctx, const char *name, int qctype);
124 /* This will NOT delete an underlying ast_function */
125 void ast_value_delete(ast_value*);
127 bool ast_value_set_name(ast_value*, const char *name);
129 bool ast_value_codegen(ast_value*, ast_function*, bool lvalue, ir_value**);
130 bool ast_local_codegen(ast_value *self, ir_function *func, bool isparam);
131 bool ast_global_codegen(ast_value *self, ir_builder *ir);
135 * A value-returning binary expression.
139 ast_expression_common expression;
142 ast_expression *left;
143 ast_expression *right;
145 ast_binary* ast_binary_new(lex_ctx ctx,
147 ast_expression *left,
148 ast_expression *right);
149 void ast_binary_delete(ast_binary*);
151 bool ast_binary_codegen(ast_binary*, ast_function*, bool lvalue, ir_value**);
155 * This must do 2 things:
156 * -) Provide a way to fetch an entity field value. (Rvalue)
157 * -) Provide a pointer to an entity field. (Lvalue)
159 * In original QC, there's only a STORE via pointer, but
160 * no LOAD via pointer.
161 * So we must know beforehand if we are going to read or assign
163 * For this we will have to extend the codegen() functions with
164 * a flag saying whether or not we need an L or an R-value.
166 struct ast_entfield_s
168 ast_expression_common expression;
169 /* The entity can come from an expression of course. */
170 ast_expression *entity;
171 /* As can the field, it just must result in a value of TYPE_FIELD */
172 ast_expression *field;
174 ast_entfield* ast_entfield_new(lex_ctx ctx, ast_expression *entity, ast_expression *field);
175 void ast_entfield_delete(ast_entfield*);
177 bool ast_entfield_codegen(ast_entfield*, ast_function*, bool lvalue, ir_value**);
181 * Stores left<-right and returns left.
182 * Specialized binary expression node
186 ast_expression_common expression;
188 ast_value *dest; /* When we add pointers this might have to change to expression */
189 ast_expression *source;
191 ast_store* ast_store_new(lex_ctx ctx, int op,
192 ast_value *d, ast_expression *s);
193 void ast_store_delete(ast_store*);
195 bool ast_store_codegen(ast_store*, ast_function*, bool lvalue, ir_value**);
199 * A general 'if then else' statement, either side can be NULL and will
200 * thus be omitted. It is an error for *both* cases to be NULL at once.
202 * During its 'codegen' it'll be changing the ast_function's block.
204 * An if is also an "expression". Its codegen will put NULL into the
205 * output field though. For ternary expressions an ast_ternary will be
210 ast_expression_common expression;
211 ast_expression *cond;
212 /* It's all just 'expressions', since an ast_block is one too. */
213 ast_expression *on_true;
214 ast_expression *on_false;
216 ast_ifthen* ast_ifthen_new(lex_ctx ctx, ast_expression *cond, ast_expression *ontrue, ast_expression *onfalse);
217 void ast_ifthen_delete(ast_ifthen*);
219 bool ast_ifthen_codegen(ast_ifthen*, ast_function*, bool lvalue, ir_value**);
221 /* Ternary expressions...
223 * Contrary to 'if-then-else' nodes, ternary expressions actually
224 * return a value, otherwise they behave the very same way.
225 * The difference in 'codegen' is that it'll return the value of
228 * The other difference is that in an ast_ternary, NEITHER side
229 * must be NULL, there's ALWAYS an else branch.
231 * This is the only ast_node beside ast_value which contains
232 * an ir_value. Theoretically we don't need to remember it though.
236 ast_expression_common expression;
237 ast_expression *cond;
238 /* It's all just 'expressions', since an ast_block is one too. */
239 ast_expression *on_true;
240 ast_expression *on_false;
241 /* After a ternary expression we find ourselves in a new IR block
242 * and start with a PHI node */
245 ast_ternary* ast_ternary_new(lex_ctx ctx, ast_expression *cond, ast_expression *ontrue, ast_expression *onfalse);
246 void ast_ternary_delete(ast_ternary*);
248 bool ast_ternary_codegen(ast_ternary*, ast_function*, bool lvalue, ir_value**);
250 /* A general loop node
252 * For convenience it contains 4 parts:
253 * -) (ini) = initializing expression
254 * -) (pre) = pre-loop condition
255 * -) (pst) = post-loop condition
256 * -) (inc) = "increment" expression
257 * The following is a psudo-representation of this loop
258 * note that '=>' bears the logical meaning of "implies".
259 * (a => b) equals (!a || b)
262 while (has_pre => {pre})
266 continue: // a 'continue' will jump here
267 if (has_pst => {pst})
275 ast_expression_common expression;
276 ast_expression *initexpr;
277 ast_expression *precond;
278 ast_expression *postcond;
279 ast_expression *increment;
280 ast_expression *body;
282 ast_loop* ast_loop_new(lex_ctx ctx,
283 ast_expression *initexpr,
284 ast_expression *precond,
285 ast_expression *postcond,
286 ast_expression *increment,
287 ast_expression *body);
288 void ast_loop_delete(ast_loop*);
290 bool ast_loop_codegen(ast_loop*, ast_function*, bool lvalue, ir_value**);
294 * Contains an ast_expression as target, rather than an ast_function/value.
295 * Since it's how QC works, every ast_function has an ast_value
296 * associated anyway - in other words, the VM contains function
297 * pointers for every function anyway. Thus, this node will call
299 * Additionally it contains a list of ast_expressions as parameters.
300 * Since calls can return values, an ast_call is also an ast_expression.
304 ast_expression_common expression;
305 ast_expression *func;
306 MEM_VECTOR_MAKE(ast_expression*, params);
308 ast_call* ast_call_new(lex_ctx ctx,
309 ast_expression *funcexpr);
310 void ast_call_delete(ast_call*);
311 bool ast_call_codegen(ast_call*, ast_function*, bool lvalue, ir_value**);
313 MEM_VECTOR_PROTO(ast_call, ast_expression*, params);
320 ast_expression_common expression;
322 MEM_VECTOR_MAKE(ast_value*, locals);
323 MEM_VECTOR_MAKE(ast_expression*, exprs);
325 ast_block* ast_block_new(lex_ctx ctx);
326 void ast_block_delete(ast_block*);
328 MEM_VECTOR_PROTO(ast_block, ast_value*, locals);
329 MEM_VECTOR_PROTO(ast_block, ast_expression*, exprs);
331 bool ast_block_codegen(ast_block*, ast_function*, bool lvalue, ir_value**);
335 * Contains a list of blocks... at least in theory.
336 * Usually there's just the main block, other blocks are inside that.
338 * Technically, functions don't need to be an AST node, since we have
339 * neither functions inside functions, nor lambdas, and function
340 * pointers could just work with a name. However, this way could be
341 * more flexible, and adds no real complexity.
343 struct ast_function_s
345 ast_node_common node;
352 ir_function *ir_func;
354 ir_block *breakblock;
355 ir_block *continueblock;
358 /* in order for thread safety - for the optional
359 * channel abesed multithreading... keeping a buffer
360 * here to use in ast_function_label.
364 MEM_VECTOR_MAKE(ast_block*, blocks);
366 /* contrary to the params in ast_value, these are the parameter variables
367 * which are to be used in expressions.
368 * The ast_value for the function contains only the parameter types used
369 * to generate ast_calls, and ast_call contains the parameter values
373 ast_function* ast_function_new(lex_ctx ctx, const char *name, ast_value *vtype);
374 /* This will NOT delete the underlying ast_value */
375 void ast_function_delete(ast_function*);
376 /* For "optimized" builds this can just keep returning "foo"...
379 const char* ast_function_label(ast_function*, const char *prefix);
381 MEM_VECTOR_PROTO(ast_function, ast_block*, blocks);
383 bool ast_function_codegen(ast_function *self, ir_builder *builder);
387 union ast_expression_u
389 ast_expression_common expression;
397 ast_entfield entfield;
404 ast_node_common node;
405 ast_expression expression;