nsz Git - libfirm/blob - ir/be/sparc/sparc_cconv.c

   1 /*
   2  * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
   3  *
   4  * This file is part of libFirm.
   5  *
   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.
  10  *
  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.
  14  *
  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
  17  * PURPOSE.
  18  */
  19
  20 /**
  21  * @file
  22  * @brief   calling convention helpers
  23  * @author  Matthias Braun
  24  * @version $Id$
  25  */
  26 #include "config.h"
  27
  28 #include "sparc_cconv.h"
  29 #include "irmode.h"
  30 #include "typerep.h"
  31 #include "xmalloc.h"
  32 #include "error.h"
  33
  34 static const arch_register_t *map_i_to_o_reg(const arch_register_t *reg)
  35 {
  36         unsigned idx = arch_register_get_index(reg);
  37         assert(REG_I0 <= idx && idx <= REG_I7);
  38         idx += REG_O0 - REG_I0;
  39         assert(REG_O0 <= idx && idx <= REG_O7);
  40         return &sparc_gp_regs[idx];
  41 }
  42
  43 calling_convention_t *sparc_decide_calling_convention(ir_type *function_type,
  44                                                       bool caller)
  45 {
  46         int                   stack_offset = 0;
  47         reg_or_stackslot_t   *params;
  48         reg_or_stackslot_t   *results;
  49         int                   n_param_regs
  50                 = sizeof(param_regs)/sizeof(param_regs[0]);
  51         int                   n_float_result_regs
  52                 = sizeof(float_result_regs)/sizeof(float_result_regs[0]);
  53         int                   n_params;
  54         int                   n_results;
  55         int                   i;
  56         int                   regnum;
  57         int                   float_regnum;
  58         calling_convention_t *cconv;
  59
  60         /* determine how parameters are passed */
  61         n_params = get_method_n_params(function_type);
  62         regnum   = 0;
  63         params   = XMALLOCNZ(reg_or_stackslot_t, n_params);
  64
  65         for (i = 0; i < n_params; ++i) {
  66                 ir_type            *param_type = get_method_param_type(function_type,i);
  67                 ir_mode            *mode       = get_type_mode(param_type);
  68                 int                 bits       = get_mode_size_bits(mode);
  69                 reg_or_stackslot_t *param      = &params[i];
  70                 param->type = param_type;
  71
  72                 if (regnum < n_param_regs) {
  73                         const arch_register_t *reg = param_regs[regnum++];
  74                         if (caller)
  75                                 reg = map_i_to_o_reg(reg);
  76                         param->reg0 = reg;
  77                 } else {
  78                         param->offset = stack_offset;
  79                         /* increase offset 4 bytes so everything is aligned */
  80                         stack_offset += bits > 32 ? bits/8 : 4;
  81                         continue;
  82                 }
  83
  84                 /* we might need a 2nd 32bit component (for 64bit or double values) */
  85                 if (bits > 32) {
  86                         if (bits > 64)
  87                                 panic("only 32 and 64bit modes supported in sparc backend");
  88
  89                         if (regnum < n_param_regs) {
  90                                 const arch_register_t *reg = param_regs[regnum++];
  91                                 if (caller)
  92                                         reg = map_i_to_o_reg(reg);
  93                                 param->reg1 = reg;
  94                         } else {
  95                                 ir_mode *mode = param_regs[0]->reg_class->mode;
  96                                 ir_type *type = get_type_for_mode(mode);
  97                                 param->type   = type;
  98                                 param->offset = stack_offset;
  99                                 assert(get_mode_size_bits(mode) == 32);
 100                                 stack_offset += 4;
 101                         }
 102                 }
 103         }
 104
 105         /* determine how results are passed */
 106         n_results    = get_method_n_ress(function_type);
 107         regnum       = 0;
 108         float_regnum = 0;
 109         results      = XMALLOCNZ(reg_or_stackslot_t, n_results);
 110         for (i = 0; i < n_results; ++i) {
 111                 ir_type            *result_type = get_method_res_type(function_type, i);
 112                 ir_mode            *result_mode = get_type_mode(result_type);
 113                 reg_or_stackslot_t *result      = &results[i];
 114
 115                 if (mode_is_float(result_mode)) {
 116                         if (float_regnum >= n_float_result_regs) {
 117                                 panic("Too many float results for sparc backend");
 118                         } else {
 119                                 const arch_register_t *reg = float_result_regs[float_regnum++];
 120                                 result->reg0 = reg;
 121                         }
 122                 } else {
 123                         if (get_mode_size_bits(result_mode) > 32) {
 124                                 panic("Results with more than 32bits not supported by sparc backend yet");
 125                         }
 126
 127                         if (regnum >= n_param_regs) {
 128                                 panic("Too many results for sparc backend");
 129                         } else {
 130                                 const arch_register_t *reg = param_regs[regnum++];
 131                                 if (caller)
 132                                         reg = map_i_to_o_reg(reg);
 133                                 result->reg0 = reg;
 134                         }
 135                 }
 136         }
 137
 138         cconv                   = XMALLOCZ(calling_convention_t);
 139         cconv->parameters       = params;
 140         cconv->param_stack_size = stack_offset;
 141         cconv->results          = results;
 142
 143         return cconv;
 144 }
 145
 146 void sparc_free_calling_convention(calling_convention_t *cconv)
 147 {
 148         free(cconv->parameters);
 149         free(cconv->results);
 150         free(cconv);
 151 }