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
41 #include "beblocksched.h"
44 #include "TEMPLATE_emitter.h"
45 #include "gen_TEMPLATE_emitter.h"
46 #include "gen_TEMPLATE_regalloc_if.h"
47 #include "TEMPLATE_nodes_attr.h"
48 #include "TEMPLATE_new_nodes.h"
50 #define SNPRINTF_BUF_LEN 128
52 void TEMPLATE_emit_immediate(const ir_node *node)
54 const TEMPLATE_attr_t *attr = get_TEMPLATE_attr_const(node);
55 be_emit_tarval(attr->value);
58 static void emit_register(const arch_register_t *reg)
60 be_emit_string(arch_register_get_name(reg));
63 void TEMPLATE_emit_source_register(const ir_node *node, int pos)
65 const arch_register_t *reg = arch_get_irn_register_in(node, pos);
69 void TEMPLATE_emit_dest_register(const ir_node *node, int pos)
71 const arch_register_t *reg = arch_get_irn_register_out(node, pos);
76 * Returns the target label for a control flow node.
78 static void TEMPLATE_emit_cfop_target(const ir_node *node)
80 ir_node *block = (ir_node*)get_irn_link(node);
81 be_gas_emit_block_name(block);
87 * Emits code for a unconditional jump.
89 static void emit_TEMPLATE_Jmp(const ir_node *node)
91 be_emit_cstring("\tjmp ");
92 TEMPLATE_emit_cfop_target(node);
93 be_emit_finish_line_gas(node);
96 static void emit_be_IncSP(const ir_node *node)
98 int offset = be_get_IncSP_offset(node);
103 /* downwards growing stack */
105 be_emit_cstring("\tsub ");
107 be_emit_cstring("\tadd ");
111 TEMPLATE_emit_source_register(node, 0);
112 be_emit_irprintf(", %d, ", offset);
113 TEMPLATE_emit_dest_register(node, 0);
114 be_emit_finish_line_gas(node);
117 static void emit_be_Start(const ir_node *node)
119 ir_graph *irg = get_irn_irg(node);
120 ir_type *frame_type = get_irg_frame_type(irg);
121 unsigned size = get_type_size_bytes(frame_type);
123 /* emit function prolog */
125 /* allocate stackframe */
127 be_emit_cstring("\tsub ");
128 emit_register(&TEMPLATE_registers[REG_SP]);
129 be_emit_irprintf(", %u, ", size);
130 emit_register(&TEMPLATE_registers[REG_SP]);
131 be_emit_finish_line_gas(node);
135 static void emit_be_Return(const ir_node *node)
137 ir_graph *irg = get_irn_irg(node);
138 ir_type *frame_type = get_irg_frame_type(irg);
139 unsigned size = get_type_size_bytes(frame_type);
141 /* emit function epilog here */
143 /* deallocate stackframe */
145 be_emit_cstring("\tadd ");
146 emit_register(&TEMPLATE_registers[REG_SP]);
147 be_emit_irprintf(", %u, ", size);
148 emit_register(&TEMPLATE_registers[REG_SP]);
149 be_emit_finish_line_gas(node);
153 be_emit_cstring("\tret");
154 be_emit_finish_line_gas(node);
157 static void emit_nothing(const ir_node *node)
163 * The type of a emitter function.
165 typedef void (emit_func)(const ir_node *node);
167 static inline void set_emitter(ir_op *op, emit_func func)
169 op->ops.generic = (op_func)func;
173 * Enters the emitter functions for handled nodes into the generic
174 * pointer of an opcode.
176 static void TEMPLATE_register_emitters(void)
178 /* first clear the generic function pointer for all ops */
179 clear_irp_opcodes_generic_func();
181 /* register all emitter functions defined in spec */
182 TEMPLATE_register_spec_emitters();
184 /* custom emitters not provided by the spec */
185 set_emitter(op_TEMPLATE_Jmp, emit_TEMPLATE_Jmp);
186 set_emitter(op_be_IncSP, emit_be_IncSP);
187 set_emitter(op_be_Return, emit_be_Return);
188 set_emitter(op_be_Start, emit_be_Start);
190 /* no need to emit anything for the following nodes */
191 set_emitter(op_Phi, emit_nothing);
192 set_emitter(op_be_Keep, emit_nothing);
195 typedef void (*emit_func_ptr) (const ir_node *);
198 * Emits code for a node.
200 static void TEMPLATE_emit_node(const ir_node *node)
202 ir_op *op = get_irn_op(node);
204 if (op->ops.generic) {
205 emit_func_ptr func = (emit_func_ptr) op->ops.generic;
208 ir_fprintf(stderr, "No emitter for node %+F\n", node);
213 * Walks over the nodes in a block connected by scheduling edges
214 * and emits code for each node.
216 static void TEMPLATE_emit_block(ir_node *block)
220 be_gas_emit_block_name(block);
221 be_emit_cstring(":\n");
222 be_emit_write_line();
224 sched_foreach(block, node) {
225 TEMPLATE_emit_node(node);
230 * Sets labels for control flow nodes (jump target)
232 static void TEMPLATE_gen_labels(ir_node *block, void *env)
235 int n = get_Block_n_cfgpreds(block);
238 for (n--; n >= 0; n--) {
239 pred = get_Block_cfgpred(block, n);
240 set_irn_link(pred, block);
247 void TEMPLATE_emit_routine(ir_graph *irg)
249 ir_node **block_schedule;
250 ir_entity *entity = get_irg_entity(irg);
254 /* register all emitter functions */
255 TEMPLATE_register_emitters();
257 /* create the block schedule */
258 block_schedule = be_create_block_schedule(irg);
260 /* emit assembler prolog */
261 be_gas_emit_function_prolog(entity, 4);
263 /* populate jump link fields with their destinations */
264 irg_block_walk_graph(irg, TEMPLATE_gen_labels, NULL, NULL);
266 n = ARR_LEN(block_schedule);
267 for (i = 0; i < n; ++i) {
268 ir_node *block = block_schedule[i];
269 TEMPLATE_emit_block(block);
271 be_gas_emit_function_epilog(entity);