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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
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9 * packaging of this file.
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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 "arm_cconv.h"
34 calling_convention_t *decide_calling_convention(ir_type *function_type)
37 reg_or_stackslot_t *params;
38 reg_or_stackslot_t *results;
40 = sizeof(param_regs)/sizeof(param_regs[0]);
42 = sizeof(result_regs)/sizeof(result_regs[0]);
43 int n_float_result_regs
44 = sizeof(float_result_regs)/sizeof(float_result_regs[0]);
50 calling_convention_t *cconv;
52 /* determine how parameters are passed */
53 n_params = get_method_n_params(function_type);
55 params = XMALLOCNZ(reg_or_stackslot_t, n_params);
57 for (i = 0; i < n_params; ++i) {
58 ir_type *param_type = get_method_param_type(function_type,i);
59 ir_mode *mode = get_type_mode(param_type);
60 int bits = get_mode_size_bits(mode);
61 reg_or_stackslot_t *param = ¶ms[i];
62 param->type = param_type;
64 if (regnum < n_param_regs) {
65 const arch_register_t *reg = param_regs[regnum++];
68 param->offset = stack_offset;
69 /* increase offset 4 bytes so everything is aligned */
70 stack_offset += bits > 32 ? bits/8 : 4;
74 /* we might need a 2nd 32bit component (for 64bit or double values) */
77 panic("only 32 and 64bit modes supported in arm backend");
79 if (regnum < n_param_regs) {
80 const arch_register_t *reg = param_regs[regnum++];
83 ir_mode *mode = param_regs[0]->reg_class->mode;
84 ir_type *type = get_type_for_mode(mode);
86 param->offset = stack_offset;
87 assert(get_mode_size_bits(mode) == 32);
93 n_results = get_method_n_ress(function_type);
96 results = XMALLOCNZ(reg_or_stackslot_t, n_results);
97 for (i = 0; i < n_results; ++i) {
98 ir_type *result_type = get_method_res_type(function_type, i);
99 ir_mode *result_mode = get_type_mode(result_type);
100 reg_or_stackslot_t *result = &results[i];
102 if (mode_is_float(result_mode)) {
103 if (float_regnum >= n_float_result_regs) {
104 panic("Too many float results for arm backend");
106 const arch_register_t *reg = float_result_regs[float_regnum++];
110 if (get_mode_size_bits(result_mode) > 32) {
111 panic("Results with more than 32bits not supported by arm backend yet");
114 if (regnum >= n_result_regs) {
115 panic("Too many results for arm backend");
117 const arch_register_t *reg = result_regs[regnum++];
123 cconv = XMALLOCZ(calling_convention_t);
124 cconv->parameters = params;
125 cconv->param_stack_size = stack_offset;
126 cconv->results = results;
131 void free_calling_convention(calling_convention_t *cconv)
133 free(cconv->parameters);
134 free(cconv->results);