/* * Copyright (C) 2012 * Wolfgang Bumiller * * Permission is hereby granted, free of charge, to any person obtaining a copy of * this software and associated documentation files (the "Software"), to deal in * the Software without restriction, including without limitation the rights to * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies * of the Software, and to permit persons to whom the Software is furnished to do * so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #include #include #include #include "gmqcc.h" #include "ast.h" #define ast_instantiate(T, ctx, destroyfn) \ T* self = (T*)mem_a(sizeof(T)); \ if (!self) { \ return NULL; \ } \ ast_node_init((ast_node*)self, ctx, TYPE_##T); \ ( (ast_node*)self )->node.destroy = (ast_node_delete*)destroyfn /* error handling */ static void asterror(lex_ctx ctx, const char *msg, ...) { va_list ap; va_start(ap, msg); con_cvprintmsg((void*)&ctx, LVL_ERROR, "error", msg, ap); va_end(ap); } /* It must not be possible to get here. */ static GMQCC_NORETURN void _ast_node_destroy(ast_node *self) { con_err("ast node missing destroy()\n"); abort(); } /* Initialize main ast node aprts */ static void ast_node_init(ast_node *self, lex_ctx ctx, int nodetype) { self->node.context = ctx; self->node.destroy = &_ast_node_destroy; self->node.keep = false; self->node.nodetype = nodetype; } /* General expression initialization */ static void ast_expression_init(ast_expression *self, ast_expression_codegen *codegen) { self->expression.codegen = codegen; self->expression.vtype = TYPE_VOID; self->expression.next = NULL; self->expression.outl = NULL; self->expression.outr = NULL; self->expression.variadic = false; self->expression.params = NULL; } static void ast_expression_delete(ast_expression *self) { size_t i; if (self->expression.next) ast_delete(self->expression.next); for (i = 0; i < vec_size(self->expression.params); ++i) { ast_delete(self->expression.params[i]); } vec_free(self->expression.params); } static void ast_expression_delete_full(ast_expression *self) { ast_expression_delete(self); mem_d(self); } ast_value* ast_value_copy(const ast_value *self) { size_t i; const ast_expression_common *fromex; ast_expression_common *selfex; ast_value *cp = ast_value_new(self->expression.node.context, self->name, self->expression.vtype); if (self->expression.next) { cp->expression.next = ast_type_copy(self->expression.node.context, self->expression.next); if (!cp->expression.next) { ast_value_delete(cp); return NULL; } } fromex = &self->expression; selfex = &cp->expression; selfex->variadic = fromex->variadic; for (i = 0; i < vec_size(fromex->params); ++i) { ast_value *v = ast_value_copy(fromex->params[i]); if (!v) { ast_value_delete(cp); return NULL; } vec_push(selfex->params, v); } return cp; } bool ast_type_adopt_impl(ast_expression *self, const ast_expression *other) { size_t i; const ast_expression_common *fromex; ast_expression_common *selfex; self->expression.vtype = other->expression.vtype; if (other->expression.next) { self->expression.next = (ast_expression*)ast_type_copy(ast_ctx(self), other->expression.next); if (!self->expression.next) return false; } fromex = &other->expression; selfex = &self->expression; selfex->variadic = fromex->variadic; for (i = 0; i < vec_size(fromex->params); ++i) { ast_value *v = ast_value_copy(fromex->params[i]); if (!v) return false; vec_push(selfex->params, v); } return true; } static ast_expression* ast_shallow_type(lex_ctx ctx, int vtype) { ast_instantiate(ast_expression, ctx, ast_expression_delete_full); ast_expression_init(self, NULL); self->expression.codegen = NULL; self->expression.next = NULL; self->expression.vtype = vtype; return self; } ast_expression* ast_type_copy(lex_ctx ctx, const ast_expression *ex) { size_t i; const ast_expression_common *fromex; ast_expression_common *selfex; if (!ex) return NULL; else { ast_instantiate(ast_expression, ctx, ast_expression_delete_full); ast_expression_init(self, NULL); fromex = &ex->expression; selfex = &self->expression; /* This may never be codegen()d */ selfex->codegen = NULL; selfex->vtype = fromex->vtype; if (fromex->next) { selfex->next = ast_type_copy(ctx, fromex->next); if (!selfex->next) { ast_expression_delete_full(self); return NULL; } } else selfex->next = NULL; selfex->variadic = fromex->variadic; for (i = 0; i < vec_size(fromex->params); ++i) { ast_value *v = ast_value_copy(fromex->params[i]); if (!v) { ast_expression_delete_full(self); return NULL; } vec_push(selfex->params, v); } return self; } } bool ast_compare_type(ast_expression *a, ast_expression *b) { if (a->expression.vtype != b->expression.vtype) return false; if (!a->expression.next != !b->expression.next) return false; if (vec_size(a->expression.params) != vec_size(b->expression.params)) return false; if (a->expression.variadic != b->expression.variadic) return false; if (vec_size(a->expression.params)) { size_t i; for (i = 0; i < vec_size(a->expression.params); ++i) { if (!ast_compare_type((ast_expression*)a->expression.params[i], (ast_expression*)b->expression.params[i])) return false; } } if (a->expression.next) return ast_compare_type(a->expression.next, b->expression.next); return true; } static size_t ast_type_to_string_impl(ast_expression *e, char *buf, size_t bufsize, size_t pos) { const char *typestr; size_t typelen; size_t i; if (!e) { if (pos + 6 >= bufsize) goto full; strcpy(buf + pos, "(null)"); return pos + 6; } if (pos + 1 >= bufsize) goto full; switch (e->expression.vtype) { case TYPE_VARIANT: strcpy(buf + pos, "(variant)"); return pos + 9; case TYPE_FIELD: buf[pos++] = '.'; return ast_type_to_string_impl(e->expression.next, buf, bufsize, pos); case TYPE_POINTER: if (pos + 3 >= bufsize) goto full; buf[pos++] = '*'; buf[pos++] = '('; pos = ast_type_to_string_impl(e->expression.next, buf, bufsize, pos); if (pos + 1 >= bufsize) goto full; buf[pos++] = ')'; return pos; case TYPE_FUNCTION: pos = ast_type_to_string_impl(e->expression.next, buf, bufsize, pos); if (pos + 2 >= bufsize) goto full; if (!vec_size(e->expression.params)) { buf[pos++] = '('; buf[pos++] = ')'; return pos; } buf[pos++] = '('; pos = ast_type_to_string_impl((ast_expression*)(e->expression.params[0]), buf, bufsize, pos); for (i = 1; i < vec_size(e->expression.params); ++i) { if (pos + 2 >= bufsize) goto full; buf[pos++] = ','; buf[pos++] = ' '; pos = ast_type_to_string_impl((ast_expression*)(e->expression.params[i]), buf, bufsize, pos); } if (pos + 1 >= bufsize) goto full; buf[pos++] = ')'; return pos; case TYPE_ARRAY: pos = ast_type_to_string_impl(e->expression.next, buf, bufsize, pos); if (pos + 1 >= bufsize) goto full; buf[pos++] = '['; pos += snprintf(buf + pos, bufsize - pos - 1, "%i", (int)e->expression.count); if (pos + 1 >= bufsize) goto full; buf[pos++] = ']'; return pos; default: typestr = type_name[e->expression.vtype]; typelen = strlen(typestr); if (pos + typelen >= bufsize) goto full; strcpy(buf + pos, typestr); return pos + typelen; } full: buf[bufsize-3] = '.'; buf[bufsize-2] = '.'; buf[bufsize-1] = '.'; return bufsize; } void ast_type_to_string(ast_expression *e, char *buf, size_t bufsize) { size_t pos = ast_type_to_string_impl(e, buf, bufsize-1, 0); buf[pos] = 0; } ast_value* ast_value_new(lex_ctx ctx, const char *name, int t) { ast_instantiate(ast_value, ctx, ast_value_delete); ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_value_codegen); self->expression.node.keep = true; /* keep */ self->name = name ? util_strdup(name) : NULL; self->expression.vtype = t; self->expression.next = NULL; self->isconst = false; self->uses = 0; memset(&self->constval, 0, sizeof(self->constval)); self->ir_v = NULL; self->ir_values = NULL; self->ir_value_count = 0; self->setter = NULL; self->getter = NULL; return self; } void ast_value_delete(ast_value* self) { if (self->name) mem_d((void*)self->name); if (self->isconst) { switch (self->expression.vtype) { case TYPE_STRING: mem_d((void*)self->constval.vstring); break; case TYPE_FUNCTION: /* unlink us from the function node */ self->constval.vfunc->vtype = NULL; break; /* NOTE: delete function? currently collected in * the parser structure */ default: break; } } if (self->ir_values) mem_d(self->ir_values); ast_expression_delete((ast_expression*)self); mem_d(self); } void ast_value_params_add(ast_value *self, ast_value *p) { vec_push(self->expression.params, p); } bool ast_value_set_name(ast_value *self, const char *name) { if (self->name) mem_d((void*)self->name); self->name = util_strdup(name); return !!self->name; } ast_binary* ast_binary_new(lex_ctx ctx, int op, ast_expression* left, ast_expression* right) { ast_instantiate(ast_binary, ctx, ast_binary_delete); ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_binary_codegen); self->op = op; self->left = left; self->right = right; if (op >= INSTR_EQ_F && op <= INSTR_GT) self->expression.vtype = TYPE_FLOAT; else if (op == INSTR_AND || op == INSTR_OR || op == INSTR_BITAND || op == INSTR_BITOR) self->expression.vtype = TYPE_FLOAT; else if (op == INSTR_MUL_VF || op == INSTR_MUL_FV) self->expression.vtype = TYPE_VECTOR; else if (op == INSTR_MUL_V) self->expression.vtype = TYPE_FLOAT; else self->expression.vtype = left->expression.vtype; return self; } void ast_binary_delete(ast_binary *self) { ast_unref(self->left); ast_unref(self->right); ast_expression_delete((ast_expression*)self); mem_d(self); } ast_binstore* ast_binstore_new(lex_ctx ctx, int storop, int op, ast_expression* left, ast_expression* right) { ast_instantiate(ast_binstore, ctx, ast_binstore_delete); ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_binstore_codegen); self->opstore = storop; self->opbin = op; self->dest = left; self->source = right; self->expression.vtype = left->expression.vtype; if (left->expression.next) { self->expression.next = ast_type_copy(ctx, left); if (!self->expression.next) { ast_delete(self); return NULL; } } else self->expression.next = NULL; return self; } void ast_binstore_delete(ast_binstore *self) { ast_unref(self->dest); ast_unref(self->source); ast_expression_delete((ast_expression*)self); mem_d(self); } ast_unary* ast_unary_new(lex_ctx ctx, int op, ast_expression *expr) { ast_instantiate(ast_unary, ctx, ast_unary_delete); ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_unary_codegen); self->op = op; self->operand = expr; if (op >= INSTR_NOT_F && op <= INSTR_NOT_FNC) { self->expression.vtype = TYPE_FLOAT; } else asterror(ctx, "cannot determine type of unary operation %s", asm_instr[op].m); return self; } void ast_unary_delete(ast_unary *self) { ast_unref(self->operand); ast_expression_delete((ast_expression*)self); mem_d(self); } ast_return* ast_return_new(lex_ctx ctx, ast_expression *expr) { ast_instantiate(ast_return, ctx, ast_return_delete); ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_return_codegen); self->operand = expr; return self; } void ast_return_delete(ast_return *self) { if (self->operand) ast_unref(self->operand); ast_expression_delete((ast_expression*)self); mem_d(self); } ast_entfield* ast_entfield_new(lex_ctx ctx, ast_expression *entity, ast_expression *field) { if (field->expression.vtype != TYPE_FIELD) { asterror(ctx, "ast_entfield_new with expression not of type field"); return NULL; } return ast_entfield_new_force(ctx, entity, field, field->expression.next); } ast_entfield* ast_entfield_new_force(lex_ctx ctx, ast_expression *entity, ast_expression *field, const ast_expression *outtype) { ast_instantiate(ast_entfield, ctx, ast_entfield_delete); if (!outtype) { mem_d(self); /* Error: field has no type... */ return NULL; } ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_entfield_codegen); self->entity = entity; self->field = field; if (!ast_type_adopt(self, outtype)) { ast_entfield_delete(self); return NULL; } return self; } void ast_entfield_delete(ast_entfield *self) { ast_unref(self->entity); ast_unref(self->field); ast_expression_delete((ast_expression*)self); mem_d(self); } ast_member* ast_member_new(lex_ctx ctx, ast_expression *owner, unsigned int field) { ast_instantiate(ast_member, ctx, ast_member_delete); if (field >= 3) { mem_d(self); return NULL; } if (owner->expression.vtype != TYPE_VECTOR && owner->expression.vtype != TYPE_FIELD) { asterror(ctx, "member-access on an invalid owner of type %s", type_name[owner->expression.vtype]); mem_d(self); return NULL; } ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_member_codegen); self->expression.node.keep = true; /* keep */ if (owner->expression.vtype == TYPE_VECTOR) { self->expression.vtype = TYPE_FLOAT; self->expression.next = NULL; } else { self->expression.vtype = TYPE_FIELD; self->expression.next = ast_shallow_type(ctx, TYPE_FLOAT); } self->owner = owner; self->field = field; return self; } void ast_member_delete(ast_member *self) { /* The owner is always an ast_value, which has .keep=true, * also: ast_members are usually deleted after the owner, thus * this will cause invalid access ast_unref(self->owner); * once we allow (expression).x to access a vector-member, we need * to change this: preferably by creating an alternate ast node for this * purpose that is not garbage-collected. */ ast_expression_delete((ast_expression*)self); mem_d(self); } ast_array_index* ast_array_index_new(lex_ctx ctx, ast_expression *array, ast_expression *index) { ast_expression *outtype; ast_instantiate(ast_array_index, ctx, ast_array_index_delete); outtype = array->expression.next; if (!outtype) { mem_d(self); /* Error: field has no type... */ return NULL; } ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_array_index_codegen); self->array = array; self->index = index; if (!ast_type_adopt(self, outtype)) { ast_array_index_delete(self); return NULL; } if (array->expression.vtype == TYPE_FIELD && outtype->expression.vtype == TYPE_ARRAY) { if (self->expression.vtype != TYPE_ARRAY) { asterror(ast_ctx(self), "array_index node on type"); ast_array_index_delete(self); return NULL; } self->array = outtype; self->expression.vtype = TYPE_FIELD; } return self; } void ast_array_index_delete(ast_array_index *self) { ast_unref(self->array); ast_unref(self->index); ast_expression_delete((ast_expression*)self); mem_d(self); } ast_ifthen* ast_ifthen_new(lex_ctx ctx, ast_expression *cond, ast_expression *ontrue, ast_expression *onfalse) { ast_instantiate(ast_ifthen, ctx, ast_ifthen_delete); if (!ontrue && !onfalse) { /* because it is invalid */ mem_d(self); return NULL; } ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_ifthen_codegen); self->cond = cond; self->on_true = ontrue; self->on_false = onfalse; return self; } void ast_ifthen_delete(ast_ifthen *self) { ast_unref(self->cond); if (self->on_true) ast_unref(self->on_true); if (self->on_false) ast_unref(self->on_false); ast_expression_delete((ast_expression*)self); mem_d(self); } ast_ternary* ast_ternary_new(lex_ctx ctx, ast_expression *cond, ast_expression *ontrue, ast_expression *onfalse) { ast_instantiate(ast_ternary, ctx, ast_ternary_delete); /* This time NEITHER must be NULL */ if (!ontrue || !onfalse) { mem_d(self); return NULL; } ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_ternary_codegen); self->cond = cond; self->on_true = ontrue; self->on_false = onfalse; self->phi_out = NULL; return self; } void ast_ternary_delete(ast_ternary *self) { ast_unref(self->cond); ast_unref(self->on_true); ast_unref(self->on_false); ast_expression_delete((ast_expression*)self); mem_d(self); } ast_loop* ast_loop_new(lex_ctx ctx, ast_expression *initexpr, ast_expression *precond, ast_expression *postcond, ast_expression *increment, ast_expression *body) { ast_instantiate(ast_loop, ctx, ast_loop_delete); ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_loop_codegen); self->initexpr = initexpr; self->precond = precond; self->postcond = postcond; self->increment = increment; self->body = body; return self; } void ast_loop_delete(ast_loop *self) { if (self->initexpr) ast_unref(self->initexpr); if (self->precond) ast_unref(self->precond); if (self->postcond) ast_unref(self->postcond); if (self->increment) ast_unref(self->increment); if (self->body) ast_unref(self->body); ast_expression_delete((ast_expression*)self); mem_d(self); } ast_breakcont* ast_breakcont_new(lex_ctx ctx, bool iscont) { ast_instantiate(ast_breakcont, ctx, ast_breakcont_delete); ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_breakcont_codegen); self->is_continue = iscont; return self; } void ast_breakcont_delete(ast_breakcont *self) { ast_expression_delete((ast_expression*)self); mem_d(self); } ast_switch* ast_switch_new(lex_ctx ctx, ast_expression *op) { ast_instantiate(ast_switch, ctx, ast_switch_delete); ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_switch_codegen); self->operand = op; self->cases = NULL; return self; } void ast_switch_delete(ast_switch *self) { size_t i; ast_unref(self->operand); for (i = 0; i < vec_size(self->cases); ++i) { if (self->cases[i].value) ast_unref(self->cases[i].value); ast_unref(self->cases[i].code); } vec_free(self->cases); ast_expression_delete((ast_expression*)self); mem_d(self); } ast_call* ast_call_new(lex_ctx ctx, ast_expression *funcexpr) { ast_instantiate(ast_call, ctx, ast_call_delete); ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_call_codegen); self->params = NULL; self->func = funcexpr; self->expression.vtype = funcexpr->expression.next->expression.vtype; if (funcexpr->expression.next->expression.next) self->expression.next = ast_type_copy(ctx, funcexpr->expression.next->expression.next); return self; } void ast_call_delete(ast_call *self) { size_t i; for (i = 0; i < vec_size(self->params); ++i) ast_unref(self->params[i]); vec_free(self->params); if (self->func) ast_unref(self->func); ast_expression_delete((ast_expression*)self); mem_d(self); } bool ast_call_check_types(ast_call *self) { size_t i; bool retval = true; const ast_expression *func = self->func; size_t count = vec_size(self->params); if (count > vec_size(func->expression.params)) count = vec_size(func->expression.params); for (i = 0; i < count; ++i) { if (!ast_compare_type(self->params[i], (ast_expression*)(func->expression.params[i]))) { asterror(ast_ctx(self), "invalid type for parameter %u in function call", (unsigned int)(i+1)); /* we don't immediately return */ retval = false; } } return retval; } ast_store* ast_store_new(lex_ctx ctx, int op, ast_expression *dest, ast_expression *source) { ast_instantiate(ast_store, ctx, ast_store_delete); ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_store_codegen); self->op = op; self->dest = dest; self->source = source; self->expression.vtype = dest->expression.vtype; if (dest->expression.next) { self->expression.next = ast_type_copy(ctx, dest); if (!self->expression.next) { ast_delete(self); return NULL; } } else self->expression.next = NULL; return self; } void ast_store_delete(ast_store *self) { ast_unref(self->dest); ast_unref(self->source); ast_expression_delete((ast_expression*)self); mem_d(self); } ast_block* ast_block_new(lex_ctx ctx) { ast_instantiate(ast_block, ctx, ast_block_delete); ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_block_codegen); self->locals = NULL; self->exprs = NULL; self->collect = NULL; return self; } void ast_block_collect(ast_block *self, ast_expression *expr) { vec_push(self->collect, expr); expr->expression.node.keep = true; } void ast_block_delete(ast_block *self) { size_t i; for (i = 0; i < vec_size(self->exprs); ++i) ast_unref(self->exprs[i]); vec_free(self->exprs); for (i = 0; i < vec_size(self->locals); ++i) ast_delete(self->locals[i]); vec_free(self->locals); for (i = 0; i < vec_size(self->collect); ++i) ast_delete(self->collect[i]); vec_free(self->collect); ast_expression_delete((ast_expression*)self); mem_d(self); } bool ast_block_set_type(ast_block *self, ast_expression *from) { if (self->expression.next) ast_delete(self->expression.next); self->expression.vtype = from->expression.vtype; if (from->expression.next) { self->expression.next = ast_type_copy(self->expression.node.context, from->expression.next); if (!self->expression.next) return false; } else self->expression.next = NULL; return true; } ast_function* ast_function_new(lex_ctx ctx, const char *name, ast_value *vtype) { ast_instantiate(ast_function, ctx, ast_function_delete); if (!vtype || vtype->isconst || vtype->expression.vtype != TYPE_FUNCTION) { mem_d(self); return NULL; } self->vtype = vtype; self->name = name ? util_strdup(name) : NULL; self->blocks = NULL; self->labelcount = 0; self->builtin = 0; self->ir_func = NULL; self->curblock = NULL; self->breakblock = NULL; self->continueblock = NULL; vtype->isconst = true; vtype->constval.vfunc = self; return self; } void ast_function_delete(ast_function *self) { size_t i; if (self->name) mem_d((void*)self->name); if (self->vtype) { /* ast_value_delete(self->vtype); */ self->vtype->isconst = false; self->vtype->constval.vfunc = NULL; /* We use unref - if it was stored in a global table it is supposed * to be deleted from *there* */ ast_unref(self->vtype); } for (i = 0; i < vec_size(self->blocks); ++i) ast_delete(self->blocks[i]); vec_free(self->blocks); mem_d(self); } const char* ast_function_label(ast_function *self, const char *prefix) { size_t id; size_t len; char *from; if (!opts_dump) return NULL; id = (self->labelcount++); len = strlen(prefix); from = self->labelbuf + sizeof(self->labelbuf)-1; *from-- = 0; do { unsigned int digit = id % 10; *from = digit + '0'; id /= 10; } while (id); memcpy(from - len, prefix, len); return from - len; } /*********************************************************************/ /* AST codegen part * by convention you must never pass NULL to the 'ir_value **out' * parameter. If you really don't care about the output, pass a dummy. * But I can't imagine a pituation where the output is truly unnecessary. */ bool ast_value_codegen(ast_value *self, ast_function *func, bool lvalue, ir_value **out) { /* NOTE: This is the codegen for a variable used in an expression. * It is not the codegen to generate the value. For this purpose, * ast_local_codegen and ast_global_codegen are to be used before this * is executed. ast_function_codegen should take care of its locals, * and the ast-user should take care of ast_global_codegen to be used * on all the globals. */ if (!self->ir_v) { char typename[1024]; ast_type_to_string((ast_expression*)self, typename, sizeof(typename)); asterror(ast_ctx(self), "ast_value used before generated %s %s", typename, self->name); return false; } *out = self->ir_v; return true; } bool ast_global_codegen(ast_value *self, ir_builder *ir, bool isfield) { ir_value *v = NULL; if (self->isconst && self->expression.vtype == TYPE_FUNCTION) { ir_function *func = ir_builder_create_function(ir, self->name, self->expression.next->expression.vtype); if (!func) return false; func->context = ast_ctx(self); func->value->context = ast_ctx(self); self->constval.vfunc->ir_func = func; self->ir_v = func->value; /* The function is filled later on ast_function_codegen... */ return true; } if (isfield && self->expression.vtype == TYPE_FIELD) { ast_expression *fieldtype = self->expression.next; if (self->isconst) { asterror(ast_ctx(self), "TODO: constant field pointers with value"); goto error; } if (fieldtype->expression.vtype == TYPE_ARRAY) { size_t ai; char *name; size_t namelen; ast_expression_common *elemtype; int vtype; ast_value *array = (ast_value*)fieldtype; if (!ast_istype(fieldtype, ast_value)) { asterror(ast_ctx(self), "internal error: ast_value required"); return false; } /* we are lame now - considering the way QC works we won't tolerate arrays > 1024 elements */ if (!array->expression.count || array->expression.count > opts_max_array_size) asterror(ast_ctx(self), "Invalid array of size %lu", (unsigned long)array->expression.count); elemtype = &array->expression.next->expression; vtype = elemtype->vtype; v = ir_builder_create_field(ir, self->name, vtype); if (!v) { asterror(ast_ctx(self), "ir_builder_create_global failed"); return false; } if (vtype == TYPE_FIELD) v->fieldtype = elemtype->next->expression.vtype; v->context = ast_ctx(self); array->ir_v = self->ir_v = v; namelen = strlen(self->name); name = (char*)mem_a(namelen + 16); strcpy(name, self->name); array->ir_values = (ir_value**)mem_a(sizeof(array->ir_values[0]) * array->expression.count); array->ir_values[0] = v; for (ai = 1; ai < array->expression.count; ++ai) { snprintf(name + namelen, 16, "[%u]", (unsigned int)ai); array->ir_values[ai] = ir_builder_create_field(ir, name, vtype); if (!array->ir_values[ai]) { mem_d(name); asterror(ast_ctx(self), "ir_builder_create_global failed"); return false; } if (vtype == TYPE_FIELD) array->ir_values[ai]->fieldtype = elemtype->next->expression.vtype; array->ir_values[ai]->context = ast_ctx(self); } mem_d(name); } else { v = ir_builder_create_field(ir, self->name, self->expression.next->expression.vtype); if (!v) return false; v->context = ast_ctx(self); self->ir_v = v; } return true; } if (self->expression.vtype == TYPE_ARRAY) { size_t ai; char *name; size_t namelen; ast_expression_common *elemtype = &self->expression.next->expression; int vtype = elemtype->vtype; /* same as with field arrays */ if (!self->expression.count || self->expression.count > opts_max_array_size) asterror(ast_ctx(self), "Invalid array of size %lu", (unsigned long)self->expression.count); v = ir_builder_create_global(ir, self->name, vtype); if (!v) { asterror(ast_ctx(self), "ir_builder_create_global failed"); return false; } if (vtype == TYPE_FIELD) v->fieldtype = elemtype->next->expression.vtype; v->context = ast_ctx(self); namelen = strlen(self->name); name = (char*)mem_a(namelen + 16); strcpy(name, self->name); self->ir_values = (ir_value**)mem_a(sizeof(self->ir_values[0]) * self->expression.count); self->ir_values[0] = v; for (ai = 1; ai < self->expression.count; ++ai) { snprintf(name + namelen, 16, "[%u]", (unsigned int)ai); self->ir_values[ai] = ir_builder_create_global(ir, name, vtype); if (!self->ir_values[ai]) { mem_d(name); asterror(ast_ctx(self), "ir_builder_create_global failed"); return false; } if (vtype == TYPE_FIELD) self->ir_values[ai]->fieldtype = elemtype->next->expression.vtype; self->ir_values[ai]->context = ast_ctx(self); } mem_d(name); } else { /* Arrays don't do this since there's no "array" value which spans across the * whole thing. */ v = ir_builder_create_global(ir, self->name, self->expression.vtype); if (!v) { asterror(ast_ctx(self), "ir_builder_create_global failed"); return false; } if (self->expression.vtype == TYPE_FIELD) v->fieldtype = self->expression.next->expression.vtype; v->context = ast_ctx(self); } if (self->isconst) { switch (self->expression.vtype) { case TYPE_FLOAT: if (!ir_value_set_float(v, self->constval.vfloat)) goto error; break; case TYPE_VECTOR: if (!ir_value_set_vector(v, self->constval.vvec)) goto error; break; case TYPE_STRING: if (!ir_value_set_string(v, self->constval.vstring)) goto error; break; case TYPE_ARRAY: asterror(ast_ctx(self), "TODO: global constant array"); break; case TYPE_FUNCTION: asterror(ast_ctx(self), "global of type function not properly generated"); goto error; /* Cannot generate an IR value for a function, * need a pointer pointing to a function rather. */ default: asterror(ast_ctx(self), "TODO: global constant type %i", self->expression.vtype); break; } } /* link us to the ir_value */ self->ir_v = v; return true; error: /* clean up */ ir_value_delete(v); return false; } bool ast_local_codegen(ast_value *self, ir_function *func, bool param) { ir_value *v = NULL; if (self->isconst && self->expression.vtype == TYPE_FUNCTION) { /* Do we allow local functions? I think not... * this is NOT a function pointer atm. */ return false; } if (self->expression.vtype == TYPE_ARRAY) { size_t ai; char *name; size_t namelen; ast_expression_common *elemtype = &self->expression.next->expression; int vtype = elemtype->vtype; if (param) { asterror(ast_ctx(self), "array-parameters are not supported"); return false; } /* we are lame now - considering the way QC works we won't tolerate arrays > 1024 elements */ if (!self->expression.count || self->expression.count > opts_max_array_size) { asterror(ast_ctx(self), "Invalid array of size %lu", (unsigned long)self->expression.count); } self->ir_values = (ir_value**)mem_a(sizeof(self->ir_values[0]) * self->expression.count); if (!self->ir_values) { asterror(ast_ctx(self), "failed to allocate array values"); return false; } v = ir_function_create_local(func, self->name, vtype, param); if (!v) { asterror(ast_ctx(self), "ir_function_create_local failed"); return false; } if (vtype == TYPE_FIELD) v->fieldtype = elemtype->next->expression.vtype; v->context = ast_ctx(self); namelen = strlen(self->name); name = (char*)mem_a(namelen + 16); strcpy(name, self->name); self->ir_values[0] = v; for (ai = 1; ai < self->expression.count; ++ai) { snprintf(name + namelen, 16, "[%u]", (unsigned int)ai); self->ir_values[ai] = ir_function_create_local(func, name, vtype, param); if (!self->ir_values[ai]) { asterror(ast_ctx(self), "ir_builder_create_global failed"); return false; } if (vtype == TYPE_FIELD) self->ir_values[ai]->fieldtype = elemtype->next->expression.vtype; self->ir_values[ai]->context = ast_ctx(self); } } else { v = ir_function_create_local(func, self->name, self->expression.vtype, param); if (!v) return false; if (self->expression.vtype == TYPE_FIELD) v->fieldtype = self->expression.next->expression.vtype; v->context = ast_ctx(self); } /* A constant local... hmmm... * I suppose the IR will have to deal with this */ if (self->isconst) { switch (self->expression.vtype) { case TYPE_FLOAT: if (!ir_value_set_float(v, self->constval.vfloat)) goto error; break; case TYPE_VECTOR: if (!ir_value_set_vector(v, self->constval.vvec)) goto error; break; case TYPE_STRING: if (!ir_value_set_string(v, self->constval.vstring)) goto error; break; default: asterror(ast_ctx(self), "TODO: global constant type %i", self->expression.vtype); break; } } /* link us to the ir_value */ self->ir_v = v; if (self->setter) { if (!ast_global_codegen(self->setter, func->owner, false) || !ast_function_codegen(self->setter->constval.vfunc, func->owner) || !ir_function_finalize(self->setter->constval.vfunc->ir_func)) return false; } if (self->getter) { if (!ast_global_codegen(self->getter, func->owner, false) || !ast_function_codegen(self->getter->constval.vfunc, func->owner) || !ir_function_finalize(self->getter->constval.vfunc->ir_func)) return false; } return true; error: /* clean up */ ir_value_delete(v); return false; } bool ast_function_codegen(ast_function *self, ir_builder *ir) { ir_function *irf; ir_value *dummy; ast_expression_common *ec; size_t i; irf = self->ir_func; if (!irf) { asterror(ast_ctx(self), "ast_function's related ast_value was not generated yet"); return false; } /* fill the parameter list */ ec = &self->vtype->expression; for (i = 0; i < vec_size(ec->params); ++i) { vec_push(irf->params, ec->params[i]->expression.vtype); if (!self->builtin) { if (!ast_local_codegen(ec->params[i], self->ir_func, true)) return false; } } if (self->builtin) { irf->builtin = self->builtin; return true; } if (!vec_size(self->blocks)) { asterror(ast_ctx(self), "function `%s` has no body", self->name); return false; } self->curblock = ir_function_create_block(irf, "entry"); if (!self->curblock) { asterror(ast_ctx(self), "failed to allocate entry block for `%s`", self->name); return false; } for (i = 0; i < vec_size(self->blocks); ++i) { ast_expression_codegen *gen = self->blocks[i]->expression.codegen; if (!(*gen)((ast_expression*)self->blocks[i], self, false, &dummy)) return false; } /* TODO: check return types */ if (!self->curblock->is_return) { return ir_block_create_return(self->curblock, NULL); /* From now on the parser has to handle this situation */ #if 0 if (!self->vtype->expression.next || self->vtype->expression.next->expression.vtype == TYPE_VOID) { return ir_block_create_return(self->curblock, NULL); } else { /* error("missing return"); */ asterror(ast_ctx(self), "function `%s` missing return value", self->name); return false; } #endif } return true; } /* Note, you will not see ast_block_codegen generate ir_blocks. * To the AST and the IR, blocks are 2 different things. * In the AST it represents a block of code, usually enclosed in * curly braces {...}. * While in the IR it represents a block in terms of control-flow. */ bool ast_block_codegen(ast_block *self, ast_function *func, bool lvalue, ir_value **out) { size_t i; /* We don't use this * Note: an ast-representation using the comma-operator * of the form: (a, b, c) = x should not assign to c... */ if (lvalue) { asterror(ast_ctx(self), "not an l-value (code-block)"); return false; } if (self->expression.outr) { *out = self->expression.outr; return true; } /* output is NULL at first, we'll have each expression * assign to out output, thus, a comma-operator represention * using an ast_block will return the last generated value, * so: (b, c) + a executed both b and c, and returns c, * which is then added to a. */ *out = NULL; /* generate locals */ for (i = 0; i < vec_size(self->locals); ++i) { if (!ast_local_codegen(self->locals[i], func->ir_func, false)) { if (opts_debug) asterror(ast_ctx(self), "failed to generate local `%s`", self->locals[i]->name); return false; } } for (i = 0; i < vec_size(self->exprs); ++i) { ast_expression_codegen *gen = self->exprs[i]->expression.codegen; if (func->curblock->final) { asterror(ast_ctx(self->exprs[i]), "unreachable statement"); return false; } if (!(*gen)(self->exprs[i], func, false, out)) return false; } self->expression.outr = *out; return true; } bool ast_store_codegen(ast_store *self, ast_function *func, bool lvalue, ir_value **out) { ast_expression_codegen *cgen; ir_value *left, *right; ast_value *arr; ast_value *idx; ast_array_index *ai = NULL; if (lvalue && self->expression.outl) { *out = self->expression.outl; return true; } if (!lvalue && self->expression.outr) { *out = self->expression.outr; return true; } if (ast_istype(self->dest, ast_array_index)) { ai = (ast_array_index*)self->dest; idx = (ast_value*)ai->index; if (ast_istype(ai->index, ast_value) && idx->isconst) ai = NULL; } if (ai) { /* we need to call the setter */ ir_value *iridx, *funval; ir_instr *call; if (lvalue) { asterror(ast_ctx(self), "array-subscript assignment cannot produce lvalues"); return false; } arr = (ast_value*)ai->array; if (!ast_istype(ai->array, ast_value) || !arr->setter) { asterror(ast_ctx(self), "value has no setter (%s)", arr->name); return false; } cgen = idx->expression.codegen; if (!(*cgen)((ast_expression*)(idx), func, false, &iridx)) return false; cgen = arr->setter->expression.codegen; if (!(*cgen)((ast_expression*)(arr->setter), func, true, &funval)) return false; cgen = self->source->expression.codegen; if (!(*cgen)((ast_expression*)(self->source), func, false, &right)) return false; call = ir_block_create_call(func->curblock, ast_function_label(func, "store"), funval); if (!call) return false; ir_call_param(call, iridx); ir_call_param(call, right); self->expression.outr = right; } else { /* regular code */ cgen = self->dest->expression.codegen; /* lvalue! */ if (!(*cgen)((ast_expression*)(self->dest), func, true, &left)) return false; self->expression.outl = left; cgen = self->source->expression.codegen; /* rvalue! */ if (!(*cgen)((ast_expression*)(self->source), func, false, &right)) return false; if (!ir_block_create_store_op(func->curblock, self->op, left, right)) return false; self->expression.outr = right; } /* Theoretically, an assinment returns its left side as an * lvalue, if we don't need an lvalue though, we return * the right side as an rvalue, otherwise we have to * somehow know whether or not we need to dereference the pointer * on the left side - that is: OP_LOAD if it was an address. * Also: in original QC we cannot OP_LOADP *anyway*. */ *out = (lvalue ? left : right); return true; } bool ast_binary_codegen(ast_binary *self, ast_function *func, bool lvalue, ir_value **out) { ast_expression_codegen *cgen; ir_value *left, *right; /* A binary operation cannot yield an l-value */ if (lvalue) { asterror(ast_ctx(self), "not an l-value (binop)"); return false; } if (self->expression.outr) { *out = self->expression.outr; return true; } cgen = self->left->expression.codegen; /* lvalue! */ if (!(*cgen)((ast_expression*)(self->left), func, false, &left)) return false; cgen = self->right->expression.codegen; /* rvalue! */ if (!(*cgen)((ast_expression*)(self->right), func, false, &right)) return false; *out = ir_block_create_binop(func->curblock, ast_function_label(func, "bin"), self->op, left, right); if (!*out) return false; self->expression.outr = *out; return true; } bool ast_binstore_codegen(ast_binstore *self, ast_function *func, bool lvalue, ir_value **out) { ast_expression_codegen *cgen; ir_value *leftl, *leftr, *right, *bin; if (lvalue && self->expression.outl) { *out = self->expression.outl; return true; } if (!lvalue && self->expression.outr) { *out = self->expression.outr; return true; } /* for a binstore we need both an lvalue and an rvalue for the left side */ /* rvalue of destination! */ cgen = self->dest->expression.codegen; if (!(*cgen)((ast_expression*)(self->dest), func, false, &leftr)) return false; /* source as rvalue only */ cgen = self->source->expression.codegen; if (!(*cgen)((ast_expression*)(self->source), func, false, &right)) return false; /* now the binary */ bin = ir_block_create_binop(func->curblock, ast_function_label(func, "binst"), self->opbin, leftr, right); self->expression.outr = bin; /* now store them */ cgen = self->dest->expression.codegen; /* lvalue of destination */ if (!(*cgen)((ast_expression*)(self->dest), func, true, &leftl)) return false; self->expression.outl = leftl; if (!ir_block_create_store_op(func->curblock, self->opstore, leftl, bin)) return false; self->expression.outr = bin; /* Theoretically, an assinment returns its left side as an * lvalue, if we don't need an lvalue though, we return * the right side as an rvalue, otherwise we have to * somehow know whether or not we need to dereference the pointer * on the left side - that is: OP_LOAD if it was an address. * Also: in original QC we cannot OP_LOADP *anyway*. */ *out = (lvalue ? leftl : bin); return true; } bool ast_unary_codegen(ast_unary *self, ast_function *func, bool lvalue, ir_value **out) { ast_expression_codegen *cgen; ir_value *operand; /* An unary operation cannot yield an l-value */ if (lvalue) { asterror(ast_ctx(self), "not an l-value (binop)"); return false; } if (self->expression.outr) { *out = self->expression.outr; return true; } cgen = self->operand->expression.codegen; /* lvalue! */ if (!(*cgen)((ast_expression*)(self->operand), func, false, &operand)) return false; *out = ir_block_create_unary(func->curblock, ast_function_label(func, "unary"), self->op, operand); if (!*out) return false; self->expression.outr = *out; return true; } bool ast_return_codegen(ast_return *self, ast_function *func, bool lvalue, ir_value **out) { ast_expression_codegen *cgen; ir_value *operand; /* In the context of a return operation, we don't actually return * anything... */ if (lvalue) { asterror(ast_ctx(self), "return-expression is not an l-value"); return false; } if (self->expression.outr) { asterror(ast_ctx(self), "internal error: ast_return cannot be reused, it bears no result!"); return false; } self->expression.outr = (ir_value*)1; if (self->operand) { cgen = self->operand->expression.codegen; /* lvalue! */ if (!(*cgen)((ast_expression*)(self->operand), func, false, &operand)) return false; if (!ir_block_create_return(func->curblock, operand)) return false; } else { if (!ir_block_create_return(func->curblock, NULL)) return false; } return true; } bool ast_entfield_codegen(ast_entfield *self, ast_function *func, bool lvalue, ir_value **out) { ast_expression_codegen *cgen; ir_value *ent, *field; /* This function needs to take the 'lvalue' flag into account! * As lvalue we provide a field-pointer, as rvalue we provide the * value in a temp. */ if (lvalue && self->expression.outl) { *out = self->expression.outl; return true; } if (!lvalue && self->expression.outr) { *out = self->expression.outr; return true; } cgen = self->entity->expression.codegen; if (!(*cgen)((ast_expression*)(self->entity), func, false, &ent)) return false; cgen = self->field->expression.codegen; if (!(*cgen)((ast_expression*)(self->field), func, false, &field)) return false; if (lvalue) { /* address! */ *out = ir_block_create_fieldaddress(func->curblock, ast_function_label(func, "efa"), ent, field); } else { *out = ir_block_create_load_from_ent(func->curblock, ast_function_label(func, "efv"), ent, field, self->expression.vtype); } if (!*out) { asterror(ast_ctx(self), "failed to create %s instruction (output type %s)", (lvalue ? "ADDRESS" : "FIELD"), type_name[self->expression.vtype]); return false; } if (lvalue) self->expression.outl = *out; else self->expression.outr = *out; /* Hm that should be it... */ return true; } bool ast_member_codegen(ast_member *self, ast_function *func, bool lvalue, ir_value **out) { ast_expression_codegen *cgen; ir_value *vec; /* in QC this is always an lvalue */ (void)lvalue; if (self->expression.outl) { *out = self->expression.outl; return true; } cgen = self->owner->expression.codegen; if (!(*cgen)((ast_expression*)(self->owner), func, true, &vec)) return false; if (vec->vtype != TYPE_VECTOR && !(vec->vtype == TYPE_FIELD && self->owner->expression.next->expression.vtype == TYPE_VECTOR)) { return false; } *out = ir_value_vector_member(vec, self->field); self->expression.outl = *out; return (*out != NULL); } bool ast_array_index_codegen(ast_array_index *self, ast_function *func, bool lvalue, ir_value **out) { ast_value *arr; ast_value *idx; if (!lvalue && self->expression.outr) { *out = self->expression.outr; } if (lvalue && self->expression.outl) { *out = self->expression.outl; } if (!ast_istype(self->array, ast_value)) { asterror(ast_ctx(self), "array indexing this way is not supported"); /* note this would actually be pointer indexing because the left side is * not an actual array but (hopefully) an indexable expression. * Once we get integer arithmetic, and GADDRESS/GSTORE/GLOAD instruction * support this path will be filled. */ return false; } arr = (ast_value*)self->array; idx = (ast_value*)self->index; if (!ast_istype(self->index, ast_value) || !idx->isconst) { /* Time to use accessor functions */ ast_expression_codegen *cgen; ir_value *iridx, *funval; ir_instr *call; if (lvalue) { asterror(ast_ctx(self), "(.2) array indexing here needs a compile-time constant"); return false; } if (!arr->getter) { asterror(ast_ctx(self), "value has no getter, don't know how to index it"); return false; } cgen = self->index->expression.codegen; if (!(*cgen)((ast_expression*)(self->index), func, true, &iridx)) return false; cgen = arr->getter->expression.codegen; if (!(*cgen)((ast_expression*)(arr->getter), func, true, &funval)) return false; call = ir_block_create_call(func->curblock, ast_function_label(func, "fetch"), funval); if (!call) return false; ir_call_param(call, iridx); *out = ir_call_value(call); self->expression.outr = *out; return true; } if (idx->expression.vtype == TYPE_FLOAT) *out = arr->ir_values[(int)idx->constval.vfloat]; else if (idx->expression.vtype == TYPE_INTEGER) *out = arr->ir_values[idx->constval.vint]; else { asterror(ast_ctx(self), "array indexing here needs an integer constant"); return false; } return true; } bool ast_ifthen_codegen(ast_ifthen *self, ast_function *func, bool lvalue, ir_value **out) { ast_expression_codegen *cgen; ir_value *condval; ir_value *dummy; ir_block *cond = func->curblock; ir_block *ontrue; ir_block *onfalse; ir_block *ontrue_endblock = NULL; ir_block *onfalse_endblock = NULL; ir_block *merge; /* We don't output any value, thus also don't care about r/lvalue */ (void)out; (void)lvalue; if (self->expression.outr) { asterror(ast_ctx(self), "internal error: ast_ifthen cannot be reused, it bears no result!"); return false; } self->expression.outr = (ir_value*)1; /* generate the condition */ func->curblock = cond; cgen = self->cond->expression.codegen; if (!(*cgen)((ast_expression*)(self->cond), func, false, &condval)) return false; /* on-true path */ if (self->on_true) { /* create on-true block */ ontrue = ir_function_create_block(func->ir_func, ast_function_label(func, "ontrue")); if (!ontrue) return false; /* enter the block */ func->curblock = ontrue; /* generate */ cgen = self->on_true->expression.codegen; if (!(*cgen)((ast_expression*)(self->on_true), func, false, &dummy)) return false; /* we now need to work from the current endpoint */ ontrue_endblock = func->curblock; } else ontrue = NULL; /* on-false path */ if (self->on_false) { /* create on-false block */ onfalse = ir_function_create_block(func->ir_func, ast_function_label(func, "onfalse")); if (!onfalse) return false; /* enter the block */ func->curblock = onfalse; /* generate */ cgen = self->on_false->expression.codegen; if (!(*cgen)((ast_expression*)(self->on_false), func, false, &dummy)) return false; /* we now need to work from the current endpoint */ onfalse_endblock = func->curblock; } else onfalse = NULL; /* Merge block were they all merge in to */ merge = ir_function_create_block(func->ir_func, ast_function_label(func, "endif")); if (!merge) return false; /* add jumps ot the merge block */ if (ontrue && !ontrue_endblock->final && !ir_block_create_jump(ontrue_endblock, merge)) return false; if (onfalse && !onfalse_endblock->final && !ir_block_create_jump(onfalse_endblock, merge)) return false; /* we create the if here, that way all blocks are ordered :) */ if (!ir_block_create_if(cond, condval, (ontrue ? ontrue : merge), (onfalse ? onfalse : merge))) { return false; } /* Now enter the merge block */ func->curblock = merge; return true; } bool ast_ternary_codegen(ast_ternary *self, ast_function *func, bool lvalue, ir_value **out) { ast_expression_codegen *cgen; ir_value *condval; ir_value *trueval, *falseval; ir_instr *phi; ir_block *cond = func->curblock; ir_block *ontrue; ir_block *onfalse; ir_block *merge; /* Ternary can never create an lvalue... */ if (lvalue) return false; /* In theory it shouldn't be possible to pass through a node twice, but * in case we add any kind of optimization pass for the AST itself, it * may still happen, thus we remember a created ir_value and simply return one * if it already exists. */ if (self->phi_out) { *out = self->phi_out; return true; } /* In the following, contraty to ast_ifthen, we assume both paths exist. */ /* generate the condition */ func->curblock = cond; cgen = self->cond->expression.codegen; if (!(*cgen)((ast_expression*)(self->cond), func, false, &condval)) return false; /* create on-true block */ ontrue = ir_function_create_block(func->ir_func, ast_function_label(func, "tern_T")); if (!ontrue) return false; else { /* enter the block */ func->curblock = ontrue; /* generate */ cgen = self->on_true->expression.codegen; if (!(*cgen)((ast_expression*)(self->on_true), func, false, &trueval)) return false; } /* create on-false block */ onfalse = ir_function_create_block(func->ir_func, ast_function_label(func, "tern_F")); if (!onfalse) return false; else { /* enter the block */ func->curblock = onfalse; /* generate */ cgen = self->on_false->expression.codegen; if (!(*cgen)((ast_expression*)(self->on_false), func, false, &falseval)) return false; } /* create merge block */ merge = ir_function_create_block(func->ir_func, ast_function_label(func, "tern_out")); if (!merge) return false; /* jump to merge block */ if (!ir_block_create_jump(ontrue, merge)) return false; if (!ir_block_create_jump(onfalse, merge)) return false; /* create if instruction */ if (!ir_block_create_if(cond, condval, ontrue, onfalse)) return false; /* Now enter the merge block */ func->curblock = merge; /* Here, now, we need a PHI node * but first some sanity checking... */ if (trueval->vtype != falseval->vtype) { /* error("ternary with different types on the two sides"); */ return false; } /* create PHI */ phi = ir_block_create_phi(merge, ast_function_label(func, "phi"), trueval->vtype); if (!phi) return false; ir_phi_add(phi, ontrue, trueval); ir_phi_add(phi, onfalse, falseval); self->phi_out = ir_phi_value(phi); *out = self->phi_out; return true; } bool ast_loop_codegen(ast_loop *self, ast_function *func, bool lvalue, ir_value **out) { ast_expression_codegen *cgen; ir_value *dummy = NULL; ir_value *precond = NULL; ir_value *postcond = NULL; /* Since we insert some jumps "late" so we have blocks * ordered "nicely", we need to keep track of the actual end-blocks * of expressions to add the jumps to. */ ir_block *bbody = NULL, *end_bbody = NULL; ir_block *bprecond = NULL, *end_bprecond = NULL; ir_block *bpostcond = NULL, *end_bpostcond = NULL; ir_block *bincrement = NULL, *end_bincrement = NULL; ir_block *bout = NULL, *bin = NULL; /* let's at least move the outgoing block to the end */ size_t bout_id; /* 'break' and 'continue' need to be able to find the right blocks */ ir_block *bcontinue = NULL; ir_block *bbreak = NULL; ir_block *old_bcontinue = NULL; ir_block *old_bbreak = NULL; ir_block *tmpblock = NULL; (void)lvalue; (void)out; if (self->expression.outr) { asterror(ast_ctx(self), "internal error: ast_loop cannot be reused, it bears no result!"); return false; } self->expression.outr = (ir_value*)1; /* NOTE: * Should we ever need some kind of block ordering, better make this function * move blocks around than write a block ordering algorithm later... after all * the ast and ir should work together, not against each other. */ /* initexpr doesn't get its own block, it's pointless, it could create more blocks * anyway if for example it contains a ternary. */ if (self->initexpr) { cgen = self->initexpr->expression.codegen; if (!(*cgen)((ast_expression*)(self->initexpr), func, false, &dummy)) return false; } /* Store the block from which we enter this chaos */ bin = func->curblock; /* The pre-loop condition needs its own block since we * need to be able to jump to the start of that expression. */ if (self->precond) { bprecond = ir_function_create_block(func->ir_func, ast_function_label(func, "pre_loop_cond")); if (!bprecond) return false; /* the pre-loop-condition the least important place to 'continue' at */ bcontinue = bprecond; /* enter */ func->curblock = bprecond; /* generate */ cgen = self->precond->expression.codegen; if (!(*cgen)((ast_expression*)(self->precond), func, false, &precond)) return false; end_bprecond = func->curblock; } else { bprecond = end_bprecond = NULL; } /* Now the next blocks won't be ordered nicely, but we need to * generate them this early for 'break' and 'continue'. */ if (self->increment) { bincrement = ir_function_create_block(func->ir_func, ast_function_label(func, "loop_increment")); if (!bincrement) return false; bcontinue = bincrement; /* increment comes before the pre-loop-condition */ } else { bincrement = end_bincrement = NULL; } if (self->postcond) { bpostcond = ir_function_create_block(func->ir_func, ast_function_label(func, "post_loop_cond")); if (!bpostcond) return false; bcontinue = bpostcond; /* postcond comes before the increment */ } else { bpostcond = end_bpostcond = NULL; } bout_id = vec_size(func->ir_func->blocks); bout = ir_function_create_block(func->ir_func, ast_function_label(func, "after_loop")); if (!bout) return false; bbreak = bout; /* The loop body... */ if (self->body) { bbody = ir_function_create_block(func->ir_func, ast_function_label(func, "loop_body")); if (!bbody) return false; /* enter */ func->curblock = bbody; old_bbreak = func->breakblock; old_bcontinue = func->continueblock; func->breakblock = bbreak; func->continueblock = bcontinue; /* generate */ cgen = self->body->expression.codegen; if (!(*cgen)((ast_expression*)(self->body), func, false, &dummy)) return false; end_bbody = func->curblock; func->breakblock = old_bbreak; func->continueblock = old_bcontinue; } /* post-loop-condition */ if (self->postcond) { /* enter */ func->curblock = bpostcond; /* generate */ cgen = self->postcond->expression.codegen; if (!(*cgen)((ast_expression*)(self->postcond), func, false, &postcond)) return false; end_bpostcond = func->curblock; } /* The incrementor */ if (self->increment) { /* enter */ func->curblock = bincrement; /* generate */ cgen = self->increment->expression.codegen; if (!(*cgen)((ast_expression*)(self->increment), func, false, &dummy)) return false; end_bincrement = func->curblock; } /* In any case now, we continue from the outgoing block */ func->curblock = bout; /* Now all blocks are in place */ /* From 'bin' we jump to whatever comes first */ if (bprecond) tmpblock = bprecond; else if (bbody) tmpblock = bbody; else if (bpostcond) tmpblock = bpostcond; else tmpblock = bout; if (!ir_block_create_jump(bin, tmpblock)) return false; /* From precond */ if (bprecond) { ir_block *ontrue, *onfalse; if (bbody) ontrue = bbody; else if (bincrement) ontrue = bincrement; else if (bpostcond) ontrue = bpostcond; else ontrue = bprecond; onfalse = bout; if (!ir_block_create_if(end_bprecond, precond, ontrue, onfalse)) return false; } /* from body */ if (bbody) { if (bincrement) tmpblock = bincrement; else if (bpostcond) tmpblock = bpostcond; else if (bprecond) tmpblock = bprecond; else tmpblock = bout; if (!end_bbody->final && !ir_block_create_jump(end_bbody, tmpblock)) return false; } /* from increment */ if (bincrement) { if (bpostcond) tmpblock = bpostcond; else if (bprecond) tmpblock = bprecond; else if (bbody) tmpblock = bbody; else tmpblock = bout; if (!ir_block_create_jump(end_bincrement, tmpblock)) return false; } /* from postcond */ if (bpostcond) { ir_block *ontrue, *onfalse; if (bprecond) ontrue = bprecond; else if (bbody) ontrue = bbody; else if (bincrement) ontrue = bincrement; else ontrue = bpostcond; onfalse = bout; if (!ir_block_create_if(end_bpostcond, postcond, ontrue, onfalse)) return false; } /* Move 'bout' to the end */ vec_remove(func->ir_func->blocks, bout_id, 1); vec_push(func->ir_func->blocks, bout); return true; } bool ast_breakcont_codegen(ast_breakcont *self, ast_function *func, bool lvalue, ir_value **out) { ir_block *target; if (lvalue) { asterror(ast_ctx(self), "break/continue expression is not an l-value"); return false; } if (self->expression.outr) { asterror(ast_ctx(self), "internal error: ast_breakcont cannot be reused!"); return false; } self->expression.outr = (ir_value*)1; if (self->is_continue) target = func->continueblock; else target = func->breakblock; if (!ir_block_create_jump(func->curblock, target)) return false; return true; } bool ast_switch_codegen(ast_switch *self, ast_function *func, bool lvalue, ir_value **out) { ast_expression_codegen *cgen; ast_switch_case *def_case = NULL; ir_block *def_bfall = NULL; ir_value *dummy = NULL; ir_value *irop = NULL; ir_block *old_break = NULL; ir_block *bout = NULL; ir_block *bfall = NULL; size_t bout_id; size_t c; char typestr[1024]; uint16_t cmpinstr; if (lvalue) { asterror(ast_ctx(self), "switch expression is not an l-value"); return false; } if (self->expression.outr) { asterror(ast_ctx(self), "internal error: ast_switch cannot be reused!"); return false; } self->expression.outr = (ir_value*)1; (void)lvalue; (void)out; cgen = self->operand->expression.codegen; if (!(*cgen)((ast_expression*)(self->operand), func, false, &irop)) return false; if (!vec_size(self->cases)) return true; cmpinstr = type_eq_instr[irop->vtype]; if (cmpinstr >= AINSTR_END) { ast_type_to_string(self->operand, typestr, sizeof(typestr)); asterror(ast_ctx(self), "invalid type to perform a switch on: %s", typestr); return false; } bout_id = vec_size(func->ir_func->blocks); bout = ir_function_create_block(func->ir_func, ast_function_label(func, "after_switch")); if (!bout) return false; /* setup the break block */ old_break = func->breakblock; func->breakblock = bout; /* Now create all cases */ for (c = 0; c < vec_size(self->cases); ++c) { ir_value *cond, *val; ir_block *bcase, *bnot; size_t bnot_id; ast_switch_case *swcase = &self->cases[c]; if (swcase->value) { /* A regular case */ /* generate the condition operand */ cgen = swcase->value->expression.codegen; if (!(*cgen)((ast_expression*)(swcase->value), func, false, &val)) return false; /* generate the condition */ cond = ir_block_create_binop(func->curblock, ast_function_label(func, "switch_eq"), cmpinstr, irop, val); if (!cond) return false; bcase = ir_function_create_block(func->ir_func, ast_function_label(func, "case")); bnot_id = vec_size(func->ir_func->blocks); bnot = ir_function_create_block(func->ir_func, ast_function_label(func, "not_case")); if (!bcase || !bnot) return false; if (!ir_block_create_if(func->curblock, cond, bcase, bnot)) return false; /* Make the previous case-end fall through */ if (bfall && !bfall->final) { if (!ir_block_create_jump(bfall, bcase)) return false; } /* enter the case */ func->curblock = bcase; cgen = swcase->code->expression.codegen; if (!(*cgen)((ast_expression*)swcase->code, func, false, &dummy)) return false; /* remember this block to fall through from */ bfall = func->curblock; /* enter the else and move it down */ func->curblock = bnot; vec_remove(func->ir_func->blocks, bnot_id, 1); vec_push(func->ir_func->blocks, bnot); } else { /* The default case */ /* Remember where to fall through from: */ def_bfall = bfall; bfall = NULL; /* remember which case it was */ def_case = swcase; } } /* If there was a default case, put it down here */ if (def_case) { ir_block *bcase; /* No need to create an extra block */ bcase = func->curblock; /* Insert the fallthrough jump */ if (def_bfall && !def_bfall->final) { if (!ir_block_create_jump(def_bfall, bcase)) return false; } /* Now generate the default code */ cgen = def_case->code->expression.codegen; if (!(*cgen)((ast_expression*)def_case->code, func, false, &dummy)) return false; } /* Jump from the last bnot to bout */ if (!func->curblock->final && !ir_block_create_jump(func->curblock, bout)) return false; /* enter the outgoing block */ func->curblock = bout; /* restore the break block */ func->breakblock = old_break; /* Move 'bout' to the end, it's nicer */ vec_remove(func->ir_func->blocks, bout_id, 1); vec_push(func->ir_func->blocks, bout); return true; } bool ast_call_codegen(ast_call *self, ast_function *func, bool lvalue, ir_value **out) { ast_expression_codegen *cgen; ir_value **params; ir_instr *callinstr; size_t i; ir_value *funval = NULL; /* return values are never lvalues */ if (lvalue) { asterror(ast_ctx(self), "not an l-value (function call)"); return false; } if (self->expression.outr) { *out = self->expression.outr; return true; } cgen = self->func->expression.codegen; if (!(*cgen)((ast_expression*)(self->func), func, false, &funval)) return false; if (!funval) return false; params = NULL; /* parameters */ for (i = 0; i < vec_size(self->params); ++i) { ir_value *param; ast_expression *expr = self->params[i]; cgen = expr->expression.codegen; if (!(*cgen)(expr, func, false, ¶m)) goto error; if (!param) goto error; vec_push(params, param); } callinstr = ir_block_create_call(func->curblock, ast_function_label(func, "call"), funval); if (!callinstr) goto error; for (i = 0; i < vec_size(params); ++i) { ir_call_param(callinstr, params[i]); } *out = ir_call_value(callinstr); self->expression.outr = *out; vec_free(params); return true; error: vec_free(params); return false; }