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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"
35 * Maps an input register representing the i'th register input
36 * to the i'th register output.
38 static const arch_register_t *map_i_to_o_reg(const arch_register_t *reg)
40 unsigned idx = arch_register_get_index(reg);
41 assert(REG_I0 <= idx && idx <= REG_I7);
42 idx += REG_O0 - REG_I0;
43 assert(REG_O0 <= idx && idx <= REG_O7);
44 return &sparc_gp_regs[idx];
47 calling_convention_t *sparc_decide_calling_convention(ir_type *function_type,
51 reg_or_stackslot_t *params;
52 reg_or_stackslot_t *results;
54 = sizeof(param_regs)/sizeof(param_regs[0]);
55 int n_float_result_regs
56 = sizeof(float_result_regs)/sizeof(float_result_regs[0]);
62 calling_convention_t *cconv;
64 /* determine how parameters are passed */
65 n_params = get_method_n_params(function_type);
67 params = XMALLOCNZ(reg_or_stackslot_t, n_params);
69 for (i = 0; i < n_params; ++i) {
70 ir_type *param_type = get_method_param_type(function_type,i);
71 ir_mode *mode = get_type_mode(param_type);
72 int bits = get_mode_size_bits(mode);
73 reg_or_stackslot_t *param = ¶ms[i];
75 if (regnum < n_param_regs) {
76 const arch_register_t *reg = param_regs[regnum++];
78 reg = map_i_to_o_reg(reg);
81 param->type = param_type;
82 param->offset = stack_offset;
83 /* increase offset 4 bytes so everything is aligned */
84 stack_offset += bits > 32 ? bits/8 : 4;
88 /* we might need a 2nd 32bit component (for 64bit or double values) */
91 panic("only 32 and 64bit modes supported in sparc backend");
93 if (regnum < n_param_regs) {
94 const arch_register_t *reg = param_regs[regnum++];
96 reg = map_i_to_o_reg(reg);
99 ir_mode *mode = param_regs[0]->reg_class->mode;
100 ir_type *type = get_type_for_mode(mode);
102 param->offset = stack_offset;
103 assert(get_mode_size_bits(mode) == 32);
109 /* determine how results are passed */
110 n_results = get_method_n_ress(function_type);
113 results = XMALLOCNZ(reg_or_stackslot_t, n_results);
114 for (i = 0; i < n_results; ++i) {
115 ir_type *result_type = get_method_res_type(function_type, i);
116 ir_mode *result_mode = get_type_mode(result_type);
117 reg_or_stackslot_t *result = &results[i];
119 if (mode_is_float(result_mode)) {
120 if (float_regnum >= n_float_result_regs) {
121 panic("Too many float results for sparc backend");
123 const arch_register_t *reg = float_result_regs[float_regnum++];
127 if (get_mode_size_bits(result_mode) > 32) {
128 panic("Results with more than 32bits not supported by sparc backend yet");
131 if (regnum >= n_param_regs) {
132 panic("Too many results for sparc backend");
134 const arch_register_t *reg = param_regs[regnum++];
136 reg = map_i_to_o_reg(reg);
142 cconv = XMALLOCZ(calling_convention_t);
143 cconv->parameters = params;
144 cconv->param_stack_size = stack_offset;
145 cconv->results = results;
150 void sparc_free_calling_convention(calling_convention_t *cconv)
152 free(cconv->parameters);
153 free(cconv->results);