2 * Copyright (C) 1995-2010 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 calling convention helpers
23 * @author Matthias Braun
28 #include "sparc_cconv.h"
36 * Maps an input register representing the i'th register input
37 * to the i'th register output.
39 static const arch_register_t *map_i_to_o_reg(const arch_register_t *reg)
41 unsigned idx = reg->global_index;
42 assert(REG_I0 <= idx && idx <= REG_I7);
43 idx += REG_O0 - REG_I0;
44 assert(REG_O0 <= idx && idx <= REG_O7);
45 return &sparc_registers[idx];
48 static void check_omit_fp(ir_node *node, void *env)
50 bool *can_omit_fp = (bool*) env;
52 /* omit-fp is not possible if:
53 * - we have allocations on the stack
54 * - we have calls (with the exception of tail-calls once we support them)
56 if ((is_Alloc(node) && get_Alloc_where(node) == stack_alloc)
57 || (is_Free(node) && get_Free_where(node) == stack_alloc)
63 calling_convention_t *sparc_decide_calling_convention(ir_type *function_type,
67 reg_or_stackslot_t *params;
68 reg_or_stackslot_t *results;
70 = sizeof(param_regs)/sizeof(param_regs[0]);
71 int n_float_result_regs
72 = sizeof(float_result_regs)/sizeof(float_result_regs[0]);
78 calling_convention_t *cconv;
82 const be_options_t *options = be_get_irg_options(irg);
83 omit_fp = options->omit_fp;
84 irg_walk_graph(irg, check_omit_fp, NULL, &omit_fp);
87 /* determine how parameters are passed */
88 n_params = get_method_n_params(function_type);
90 params = XMALLOCNZ(reg_or_stackslot_t, n_params);
92 for (i = 0; i < n_params; ++i) {
93 ir_type *param_type = get_method_param_type(function_type,i);
94 ir_mode *mode = get_type_mode(param_type);
95 int bits = get_mode_size_bits(mode);
96 reg_or_stackslot_t *param = ¶ms[i];
98 if (regnum < n_param_regs) {
99 const arch_register_t *reg = param_regs[regnum++];
100 if (irg == NULL || omit_fp)
101 reg = map_i_to_o_reg(reg);
104 param->type = param_type;
105 param->offset = stack_offset;
106 /* increase offset 4 bytes so everything is aligned */
107 stack_offset += bits > 32 ? bits/8 : 4;
111 /* we might need a 2nd 32bit component (for 64bit or double values) */
114 panic("only 32 and 64bit modes supported in sparc backend");
116 if (regnum < n_param_regs) {
117 const arch_register_t *reg = param_regs[regnum++];
118 if (irg == NULL || omit_fp)
119 reg = map_i_to_o_reg(reg);
122 ir_mode *mode = param_regs[0]->reg_class->mode;
123 ir_type *type = get_type_for_mode(mode);
125 param->offset = stack_offset;
126 assert(get_mode_size_bits(mode) == 32);
132 /* determine how results are passed */
133 n_results = get_method_n_ress(function_type);
136 results = XMALLOCNZ(reg_or_stackslot_t, n_results);
137 for (i = 0; i < n_results; ++i) {
138 ir_type *result_type = get_method_res_type(function_type, i);
139 ir_mode *result_mode = get_type_mode(result_type);
140 reg_or_stackslot_t *result = &results[i];
142 if (mode_is_float(result_mode)) {
143 if (float_regnum >= n_float_result_regs) {
144 panic("Too many float results for sparc backend");
146 const arch_register_t *reg = float_result_regs[float_regnum++];
150 if (get_mode_size_bits(result_mode) > 32) {
151 panic("Results with more than 32bits not supported by sparc backend yet");
154 if (regnum >= n_param_regs) {
155 panic("Too many results for sparc backend");
157 const arch_register_t *reg = param_regs[regnum++];
158 if (irg == NULL || omit_fp)
159 reg = map_i_to_o_reg(reg);
165 cconv = XMALLOCZ(calling_convention_t);
166 cconv->parameters = params;
167 cconv->param_stack_size = stack_offset;
168 cconv->results = results;
169 cconv->omit_fp = omit_fp;
174 void sparc_free_calling_convention(calling_convention_t *cconv)
176 free(cconv->parameters);
177 free(cconv->results);