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
39 #include "../besched.h"
40 #include "../begnuas.h"
41 #include "../beblocksched.h"
42 #include "../benode.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
53 * Returns the register at in position pos.
55 static const arch_register_t *get_in_reg(const ir_node *node, int pos)
57 ir_node *op = get_irn_n(node, pos);
58 return arch_get_irn_register(op);
61 void TEMPLATE_emit_immediate(const ir_node *node)
63 const TEMPLATE_attr_t *attr = get_TEMPLATE_attr_const(node);
64 be_emit_tarval(attr->value);
67 static void emit_register(const arch_register_t *reg)
69 be_emit_string(arch_register_get_name(reg));
72 void TEMPLATE_emit_source_register(const ir_node *node, int pos)
74 const arch_register_t *reg = get_in_reg(node, pos);
78 void TEMPLATE_emit_dest_register(const ir_node *node, int pos)
80 const arch_register_t *reg = arch_irn_get_register(node, pos);
85 * Returns the target label for a control flow node.
87 static void TEMPLATE_emit_cfop_target(const ir_node *node)
89 ir_node *block = (ir_node*)get_irn_link(node);
90 be_gas_emit_block_name(block);
96 * Emits code for a unconditional jump.
98 static void emit_TEMPLATE_Jmp(const ir_node *node)
100 be_emit_cstring("\tjmp ");
101 TEMPLATE_emit_cfop_target(node);
102 be_emit_finish_line_gas(node);
105 static void emit_be_IncSP(const ir_node *node)
107 int offset = be_get_IncSP_offset(node);
112 /* downwards growing stack */
114 be_emit_cstring("\tsub ");
116 be_emit_cstring("\tadd ");
120 TEMPLATE_emit_source_register(node, 0);
121 be_emit_irprintf(", %d, ", offset);
122 TEMPLATE_emit_dest_register(node, 0);
123 be_emit_finish_line_gas(node);
126 static void emit_be_Start(const ir_node *node)
128 ir_graph *irg = get_irn_irg(node);
129 ir_type *frame_type = get_irg_frame_type(irg);
130 unsigned size = get_type_size_bytes(frame_type);
132 /* emit function prolog */
134 /* allocate stackframe */
136 be_emit_cstring("\tsub ");
137 emit_register(&TEMPLATE_registers[REG_SP]);
138 be_emit_irprintf(", %u, ", size);
139 emit_register(&TEMPLATE_registers[REG_SP]);
140 be_emit_finish_line_gas(node);
144 static void emit_be_Return(const ir_node *node)
146 ir_graph *irg = get_irn_irg(node);
147 ir_type *frame_type = get_irg_frame_type(irg);
148 unsigned size = get_type_size_bytes(frame_type);
150 /* emit function epilog here */
152 /* deallocate stackframe */
154 be_emit_cstring("\tadd ");
155 emit_register(&TEMPLATE_registers[REG_SP]);
156 be_emit_irprintf(", %u, ", size);
157 emit_register(&TEMPLATE_registers[REG_SP]);
158 be_emit_finish_line_gas(node);
162 be_emit_cstring("\tret");
163 be_emit_finish_line_gas(node);
166 static void emit_nothing(const ir_node *node)
172 * The type of a emitter function.
174 typedef void (emit_func)(const ir_node *node);
176 static inline void set_emitter(ir_op *op, emit_func func)
178 op->ops.generic = (op_func)func;
182 * Enters the emitter functions for handled nodes into the generic
183 * pointer of an opcode.
185 static void TEMPLATE_register_emitters(void)
187 /* first clear the generic function pointer for all ops */
188 clear_irp_opcodes_generic_func();
190 /* register all emitter functions defined in spec */
191 TEMPLATE_register_spec_emitters();
193 /* custom emitters not provided by the spec */
194 set_emitter(op_TEMPLATE_Jmp, emit_TEMPLATE_Jmp);
195 set_emitter(op_be_IncSP, emit_be_IncSP);
196 set_emitter(op_be_Return, emit_be_Return);
197 set_emitter(op_be_Start, emit_be_Start);
199 /* no need to emit anything for the following nodes */
200 set_emitter(op_Phi, emit_nothing);
201 set_emitter(op_be_Keep, emit_nothing);
204 typedef void (*emit_func_ptr) (const ir_node *);
207 * Emits code for a node.
209 static void TEMPLATE_emit_node(const ir_node *node)
211 ir_op *op = get_irn_op(node);
213 if (op->ops.generic) {
214 emit_func_ptr func = (emit_func_ptr) op->ops.generic;
217 ir_fprintf(stderr, "No emitter for node %+F\n", node);
222 * Walks over the nodes in a block connected by scheduling edges
223 * and emits code for each node.
225 static void TEMPLATE_emit_block(ir_node *block)
229 be_gas_emit_block_name(block);
230 be_emit_cstring(":\n");
231 be_emit_write_line();
233 sched_foreach(block, node) {
234 TEMPLATE_emit_node(node);
239 * Sets labels for control flow nodes (jump target)
241 static void TEMPLATE_gen_labels(ir_node *block, void *env)
244 int n = get_Block_n_cfgpreds(block);
247 for (n--; n >= 0; n--) {
248 pred = get_Block_cfgpred(block, n);
249 set_irn_link(pred, block);
256 void TEMPLATE_emit_routine(ir_graph *irg)
258 ir_node **block_schedule;
259 ir_entity *entity = get_irg_entity(irg);
263 /* register all emitter functions */
264 TEMPLATE_register_emitters();
266 /* create the block schedule */
267 block_schedule = be_create_block_schedule(irg);
269 /* emit assembler prolog */
270 be_gas_emit_function_prolog(entity, 4);
272 /* populate jump link fields with their destinations */
273 irg_block_walk_graph(irg, TEMPLATE_gen_labels, NULL, NULL);
275 n = ARR_LEN(block_schedule);
276 for (i = 0; i < n; ++i) {
277 ir_node *block = block_schedule[i];
278 TEMPLATE_emit_block(block);
280 be_gas_emit_function_epilog(entity);