2 * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief emit assembler for a backend graph
40 #include "beblocksched.h"
43 #include "TEMPLATE_emitter.h"
44 #include "gen_TEMPLATE_emitter.h"
45 #include "gen_TEMPLATE_regalloc_if.h"
46 #include "TEMPLATE_nodes_attr.h"
47 #include "TEMPLATE_new_nodes.h"
49 #define SNPRINTF_BUF_LEN 128
51 void TEMPLATE_emit_immediate(const ir_node *node)
53 const TEMPLATE_attr_t *attr = get_TEMPLATE_attr_const(node);
54 be_emit_tarval(attr->value);
57 static void emit_register(const arch_register_t *reg)
59 be_emit_string(arch_register_get_name(reg));
62 void TEMPLATE_emit_source_register(const ir_node *node, int pos)
64 const arch_register_t *reg = arch_get_irn_register_in(node, pos);
68 void TEMPLATE_emit_dest_register(const ir_node *node, int pos)
70 const arch_register_t *reg = arch_get_irn_register_out(node, pos);
75 * Returns the target label for a control flow node.
77 static void TEMPLATE_emit_cfop_target(const ir_node *node)
79 ir_node *block = (ir_node*)get_irn_link(node);
80 be_gas_emit_block_name(block);
86 * Emits code for a unconditional jump.
88 static void emit_TEMPLATE_Jmp(const ir_node *node)
90 be_emit_cstring("\tjmp ");
91 TEMPLATE_emit_cfop_target(node);
92 be_emit_finish_line_gas(node);
95 static void emit_be_IncSP(const ir_node *node)
97 int offset = be_get_IncSP_offset(node);
102 /* downwards growing stack */
104 be_emit_cstring("\tsub ");
106 be_emit_cstring("\tadd ");
110 TEMPLATE_emit_source_register(node, 0);
111 be_emit_irprintf(", %d, ", offset);
112 TEMPLATE_emit_dest_register(node, 0);
113 be_emit_finish_line_gas(node);
116 static void emit_be_Start(const ir_node *node)
118 ir_graph *irg = get_irn_irg(node);
119 ir_type *frame_type = get_irg_frame_type(irg);
120 unsigned size = get_type_size_bytes(frame_type);
122 /* emit function prolog */
124 /* allocate stackframe */
126 be_emit_cstring("\tsub ");
127 emit_register(&TEMPLATE_registers[REG_SP]);
128 be_emit_irprintf(", %u, ", size);
129 emit_register(&TEMPLATE_registers[REG_SP]);
130 be_emit_finish_line_gas(node);
134 static void emit_be_Return(const ir_node *node)
136 ir_graph *irg = get_irn_irg(node);
137 ir_type *frame_type = get_irg_frame_type(irg);
138 unsigned size = get_type_size_bytes(frame_type);
140 /* emit function epilog here */
142 /* deallocate stackframe */
144 be_emit_cstring("\tadd ");
145 emit_register(&TEMPLATE_registers[REG_SP]);
146 be_emit_irprintf(", %u, ", size);
147 emit_register(&TEMPLATE_registers[REG_SP]);
148 be_emit_finish_line_gas(node);
152 be_emit_cstring("\tret");
153 be_emit_finish_line_gas(node);
156 static void emit_nothing(const ir_node *node)
162 * The type of a emitter function.
164 typedef void (emit_func)(const ir_node *node);
166 static inline void set_emitter(ir_op *op, emit_func func)
168 op->ops.generic = (op_func)func;
172 * Enters the emitter functions for handled nodes into the generic
173 * pointer of an opcode.
175 static void TEMPLATE_register_emitters(void)
177 /* first clear the generic function pointer for all ops */
178 clear_irp_opcodes_generic_func();
180 /* register all emitter functions defined in spec */
181 TEMPLATE_register_spec_emitters();
183 /* custom emitters not provided by the spec */
184 set_emitter(op_TEMPLATE_Jmp, emit_TEMPLATE_Jmp);
185 set_emitter(op_be_IncSP, emit_be_IncSP);
186 set_emitter(op_be_Return, emit_be_Return);
187 set_emitter(op_be_Start, emit_be_Start);
189 /* no need to emit anything for the following nodes */
190 set_emitter(op_Phi, emit_nothing);
191 set_emitter(op_be_Keep, emit_nothing);
194 typedef void (*emit_func_ptr) (const ir_node *);
197 * Emits code for a node.
199 static void TEMPLATE_emit_node(const ir_node *node)
201 ir_op *op = get_irn_op(node);
203 if (op->ops.generic) {
204 emit_func_ptr func = (emit_func_ptr) op->ops.generic;
207 ir_fprintf(stderr, "No emitter for node %+F\n", node);
212 * Walks over the nodes in a block connected by scheduling edges
213 * and emits code for each node.
215 static void TEMPLATE_emit_block(ir_node *block)
219 be_gas_emit_block_name(block);
220 be_emit_cstring(":\n");
221 be_emit_write_line();
223 sched_foreach(block, node) {
224 TEMPLATE_emit_node(node);
229 * Sets labels for control flow nodes (jump target)
231 static void TEMPLATE_gen_labels(ir_node *block, void *env)
234 int n = get_Block_n_cfgpreds(block);
237 for (n--; n >= 0; n--) {
238 pred = get_Block_cfgpred(block, n);
239 set_irn_link(pred, block);
246 void TEMPLATE_emit_routine(ir_graph *irg)
248 ir_node **block_schedule;
249 ir_entity *entity = get_irg_entity(irg);
253 /* register all emitter functions */
254 TEMPLATE_register_emitters();
256 /* create the block schedule */
257 block_schedule = be_create_block_schedule(irg);
259 /* emit assembler prolog */
260 be_gas_emit_function_prolog(entity, 4);
262 /* populate jump link fields with their destinations */
263 irg_block_walk_graph(irg, TEMPLATE_gen_labels, NULL, NULL);
265 n = ARR_LEN(block_schedule);
266 for (i = 0; i < n; ++i) {
267 ir_node *block = block_schedule[i];
268 TEMPLATE_emit_block(block);
270 be_gas_emit_function_epilog(entity);