Mercurial > projects > ldc
annotate gen/asmstmt.cpp @ 233:76ee1bbe487e trunk
[svn r249] Changed inline asm clobbers to a set instead of a list so we don't get duplicate clobbers.
author | lindquist |
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date | Sun, 08 Jun 2008 06:45:54 +0200 |
parents | 092468448d25 |
children | 9760f54af0b7 |
rev | line source |
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1 // Taken from GDC source tree, licence unclear? |
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2 // |
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3 // Taken from an earlier version of DMD -- why is it missing from 0.79? |
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4 |
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5 #include "gen/llvm.h" |
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6 #include "llvm/InlineAsm.h" |
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7 |
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8 //#include "d-gcc-includes.h" |
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9 //#include "total.h" |
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10 #include "dmd/statement.h" |
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11 #include "dmd/scope.h" |
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12 #include "dmd/declaration.h" |
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13 #include "dmd/dsymbol.h" |
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14 |
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15 #include <cassert> |
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16 #include <deque> |
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17 #include <iostream> |
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18 #include <sstream> |
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19 #include <cstring> |
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20 |
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21 //#include "d-lang.h" |
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22 //#include "d-codegen.h" |
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23 |
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24 #include "gen/irstate.h" |
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25 #include "gen/dvalue.h" |
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26 #include "gen/tollvm.h" |
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27 #include "gen/logger.h" |
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28 #include "gen/todebug.h" |
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29 |
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30 typedef enum { |
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31 Arg_Integer, |
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32 Arg_Pointer, |
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33 Arg_Memory, |
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34 Arg_FrameRelative, |
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35 Arg_LocalSize, |
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36 Arg_Dollar |
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37 } AsmArgType; |
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38 |
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39 typedef enum { |
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40 Mode_Input, |
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41 Mode_Output, |
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42 Mode_Update |
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43 } AsmArgMode; |
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44 |
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45 struct AsmArg { |
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46 AsmArgType type; |
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47 Expression * expr; |
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48 AsmArgMode mode; |
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49 AsmArg(AsmArgType type, Expression * expr, AsmArgMode mode) { |
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50 this->type = type; |
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51 this->expr = expr; |
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52 this->mode = mode; |
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53 } |
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54 }; |
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55 |
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56 struct AsmCode { |
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57 char * insnTemplate; |
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58 unsigned insnTemplateLen; |
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59 Array args; // of AsmArg |
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60 unsigned moreRegs; |
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61 unsigned dollarLabel; |
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62 int clobbersMemory; |
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63 AsmCode() { |
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64 insnTemplate = NULL; |
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65 insnTemplateLen = 0; |
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66 moreRegs = 0; |
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67 dollarLabel = 0; |
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68 clobbersMemory = 0; |
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69 } |
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70 }; |
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71 |
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72 AsmStatement::AsmStatement(Loc loc, Token *tokens) : |
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73 Statement(loc) |
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74 { |
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75 this->tokens = tokens; // Do I need to copy these? |
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76 asmcode = 0; |
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77 asmalign = 0; |
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78 refparam = 0; |
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79 naked = 0; |
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80 regs = 0; |
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81 } |
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82 |
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83 Statement *AsmStatement::syntaxCopy() |
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84 { |
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85 // copy tokens? copy 'code'? |
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86 AsmStatement * a_s = new AsmStatement(loc,tokens); |
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87 a_s->asmcode = asmcode; |
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88 a_s->refparam = refparam; |
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89 a_s->naked = naked; |
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90 a_s->regs = a_s->regs; |
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91 return a_s; |
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92 } |
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93 |
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94 void AsmStatement::toCBuffer(OutBuffer *buf, HdrGenState *hgs) |
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95 { |
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96 bool sep = 0, nsep = 0; |
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97 buf->writestring("asm { "); |
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98 |
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99 for (Token * t = tokens; t; t = t->next) { |
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100 switch (t->value) { |
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101 case TOKlparen: |
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102 case TOKrparen: |
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103 case TOKlbracket: |
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104 case TOKrbracket: |
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105 case TOKcolon: |
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106 case TOKsemicolon: |
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107 case TOKcomma: |
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108 case TOKstring: |
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109 case TOKcharv: |
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110 case TOKwcharv: |
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111 case TOKdcharv: |
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112 nsep = 0; |
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113 break; |
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114 default: |
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115 nsep = 1; |
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116 } |
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117 if (sep + nsep == 2) |
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118 buf->writeByte(' '); |
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119 sep = nsep; |
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120 buf->writestring(t->toChars()); |
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121 } |
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122 buf->writestring("; }"); |
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123 buf->writenl(); |
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124 } |
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125 |
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126 int AsmStatement::comeFrom() |
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127 { |
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128 return FALSE; |
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129 } |
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130 |
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131 /* GCC does not support jumps from asm statements. When optimization |
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132 is turned on, labels referenced only from asm statements will not |
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133 be output at the correct location. There are ways around this: |
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134 |
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135 1) Reference the label with a reachable goto statement |
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136 2) Have reachable computed goto in the function |
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137 3) Hack cfgbuild.c to act as though there is a computed goto. |
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138 |
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139 These are all pretty bad, but if would be nice to be able to tell |
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140 GCC not to optimize in this case (even on per label/block basis). |
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141 |
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142 The current solution is output our own private labels (as asm |
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143 statements) along with the "real" label. If the label happens to |
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144 be referred to by a goto statement, the "real" label will also be |
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145 output in the correct location. |
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146 |
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147 Also had to add 'asmLabelNum' to LabelDsymbol to indicate it needs |
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148 special processing. |
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149 |
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150 (junk) d-lang.cc:916:case LABEL_DECL: // C doesn't do this. D needs this for referencing labels in inline assembler since there may be not goto referencing it. |
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151 |
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152 */ |
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153 |
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154 static unsigned d_priv_asm_label_serial = 0; |
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155 |
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156 // may need to make this target-specific |
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157 static void d_format_priv_asm_label(char * buf, unsigned n) |
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158 { |
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159 //ASM_GENERATE_INTERNAL_LABEL(buf, "LDASM", n);//inserts a '*' for use with assemble_name |
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160 sprintf(buf, ".LDASM%u", n); |
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161 } |
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162 |
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163 void |
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164 d_expand_priv_asm_label(IRState * irs, unsigned n) |
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165 { |
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166 /* char buf[64]; |
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167 d_format_priv_asm_label(buf, n); |
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168 strcat(buf, ":"); |
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169 tree insnt = build_string(strlen(buf), buf); |
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170 #if D_GCC_VER < 40 |
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171 expand_asm(insnt, 1); |
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172 #else |
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173 tree t = d_build_asm_stmt(insnt, NULL_TREE, NULL_TREE, NULL_TREE); |
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174 ASM_VOLATILE_P( t ) = 1; |
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175 ASM_INPUT_P( t) = 1; // what is this doing? |
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176 irs->addExp(t); |
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177 #endif*/ |
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178 } |
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179 |
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180 |
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181 // StringExp::toIR usually adds a NULL. We don't want that... |
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182 |
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183 /*static tree |
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184 naturalString(Expression * e) |
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185 { |
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186 // don't fail, just an error? |
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187 assert(e->op == TOKstring); |
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188 StringExp * s = (StringExp *) e; |
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189 assert(s->sz == 1); |
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190 return build_string(s->len, (char *) s->string); |
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191 }*/ |
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192 |
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193 |
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194 #include "d-asm-i386.h" |
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195 |
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196 bool d_have_inline_asm() { return true; } |
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197 |
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198 Statement *AsmStatement::semantic(Scope *sc) |
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199 { |
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200 |
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201 sc->func->inlineAsm = 1; |
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202 sc->func->inlineStatus = ILSno; // %% not sure |
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203 // %% need to set DECL_UNINLINABLE too? |
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204 sc->func->hasReturnExp = 1; // %% DMD does this, apparently... |
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205 |
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206 // empty statement -- still do the above things because they might be expected? |
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207 if (! tokens) |
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208 return this; |
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209 |
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210 AsmProcessor ap(sc, this); |
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211 ap.run(); |
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212 return this; |
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213 } |
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214 |
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215 void |
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216 AsmStatement::toIR(IRState * irs) |
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217 { |
220
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218 Logger::println("AsmStatement::toIR(): %s", loc.toChars()); |
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219 LOG_SCOPE; |
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220 |
233
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221 // get asm block |
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222 IRAsmBlock* asmblock = irs->asmBlock; |
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223 assert(asmblock); |
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224 |
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225 // debug info |
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226 if (global.params.symdebug) |
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227 DtoDwarfStopPoint(loc.linnum); |
219
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228 |
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229 if (! asmcode) |
233
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230 return; |
219
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231 |
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232 static std::string i_cns = "i"; |
231
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233 static std::string p_cns = "i"; |
229
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234 static std::string l_cns = "X"; |
222
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235 static std::string m_cns = "*m"; |
221
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236 static std::string mw_cns = "=*m"; |
223
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237 static std::string mrw_cns = "+*m"; |
219
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238 static std::string memory_name = "memory"; |
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239 |
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240 AsmCode * code = (AsmCode *) asmcode; |
229
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241 std::deque<LLValue*> input_values; |
219
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242 std::deque<std::string> input_constraints; |
229
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243 std::deque<LLValue*> output_values; |
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244 std::deque<std::string> output_constraints; |
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245 std::deque<std::string> clobbers; |
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246 |
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247 // FIXME |
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248 #define HOST_WIDE_INT long |
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249 HOST_WIDE_INT var_frame_offset; // "frame_offset" is a macro |
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250 bool clobbers_mem = code->clobbersMemory; |
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251 int input_idx = 0; |
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252 int n_outputs = 0; |
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253 int arg_map[10]; |
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254 |
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255 assert(code->args.dim <= 10); |
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256 |
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257 for (unsigned i = 0; i < code->args.dim; i++) { |
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258 AsmArg * arg = (AsmArg *) code->args.data[i]; |
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259 |
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260 bool is_input = true; |
229
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261 LLValue* arg_val = 0; |
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262 std::string cns; |
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263 |
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264 std::cout << std::endl; |
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265 |
219
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266 switch (arg->type) { |
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267 case Arg_Integer: |
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268 arg_val = arg->expr->toElem(irs)->getRVal(); |
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269 do_integer: |
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270 cns = i_cns; |
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271 break; |
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272 case Arg_Pointer: |
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273 // FIXME |
220
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274 std::cout << "asm fixme Arg_Pointer" << std::endl; |
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275 if (arg->expr->op == TOKdsymbol) |
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276 { |
232
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277 assert(0); |
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278 DsymbolExp* dse = (DsymbolExp*)arg->expr; |
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279 LabelDsymbol* lbl = dse->s->isLabel(); |
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280 assert(lbl); |
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281 arg_val = lbl->statement->llvmBB; |
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282 if (!arg_val) |
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283 { |
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284 arg_val = lbl->statement->llvmBB = llvm::BasicBlock::Create("label", irs->topfunc()); |
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285 } |
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286 cns = l_cns; |
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287 } |
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288 else |
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289 { |
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290 arg_val = arg->expr->toElem(irs)->getRVal(); |
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291 cns = p_cns; |
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292 } |
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293 /*if (arg->expr->op == TOKvar) |
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294 arg_val = arg->expr->toElem(irs); |
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295 else if (arg->expr->op == TOKdsymbol) |
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296 arg_val = arg->expr->toElem(irs); |
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297 else |
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298 assert(0);*/ |
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299 |
219
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300 break; |
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301 case Arg_Memory: |
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302 // FIXME |
220
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303 std::cout << "asm fixme Arg_Memory" << std::endl; |
229
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304 arg_val = arg->expr->toElem(irs)->getRVal(); |
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305 // if (arg->expr->op == TOKvar) |
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306 // arg_val = arg->expr->toElem(irs); |
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307 // else |
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308 // arg_val = arg->expr->toElem(irs); |
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309 |
219
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310 switch (arg->mode) { |
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311 case Mode_Input: cns = m_cns; break; |
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312 case Mode_Output: cns = mw_cns; is_input = false; break; |
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313 case Mode_Update: cns = mrw_cns; is_input = false; break; |
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314 default: assert(0); break; |
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315 } |
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316 break; |
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317 case Arg_FrameRelative: |
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318 // FIXME |
220
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319 std::cout << "asm fixme Arg_FrameRelative" << std::endl; |
229
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320 assert(0); |
219
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321 /* if (arg->expr->op == TOKvar) |
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322 arg_val = ((VarExp *) arg->expr)->var->toSymbol()->Stree; |
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323 else |
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324 assert(0);*/ |
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325 if ( getFrameRelativeValue(arg_val, & var_frame_offset) ) { |
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326 // arg_val = irs->integerConstant(var_frame_offset); |
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327 cns = i_cns; |
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328 } else { |
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329 this->error("%s", "argument not frame relative"); |
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330 return; |
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331 } |
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332 if (arg->mode != Mode_Input) |
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333 clobbers_mem = true; |
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334 break; |
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335 case Arg_LocalSize: |
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336 // FIXME |
220
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337 std::cout << "asm fixme Arg_LocalSize" << std::endl; |
229
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338 assert(0); |
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339 /* var_frame_offset = cfun->x_frame_offset; |
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340 if (var_frame_offset < 0) |
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341 var_frame_offset = - var_frame_offset; |
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342 arg_val = irs->integerConstant( var_frame_offset );*/ |
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343 goto do_integer; |
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344 default: |
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345 assert(0); |
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346 } |
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347 |
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348 if (is_input) { |
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349 arg_map[i] = --input_idx; |
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350 //inputs.cons(tree_cons(NULL_TREE, cns, NULL_TREE), arg_val); |
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351 input_values.push_back(arg_val); |
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352 input_constraints.push_back(cns); |
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353 } else { |
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354 arg_map[i] = n_outputs++; |
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355 //outputs.cons(tree_cons(NULL_TREE, cns, NULL_TREE), arg_val); |
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356 output_values.push_back(arg_val); |
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357 output_constraints.push_back(cns); |
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358 } |
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359 } |
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360 |
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361 // Telling GCC that callee-saved registers are clobbered makes it preserve |
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362 // those registers. This changes the stack from what a naked function |
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363 // expects. |
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364 |
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365 // FIXME |
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366 // if (! irs->func->naked) { |
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367 for (int i = 0; i < 32; i++) { |
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368 if (regs & (1 << i)) { |
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369 //clobbers.cons(NULL_TREE, regInfo[i].gccName); |
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370 clobbers.push_back(regInfo[i].gccName); |
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371 } |
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372 } |
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373 for (int i = 0; i < 32; i++) { |
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374 if (code->moreRegs & (1 << (i-32))) { |
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375 //clobbers.cons(NULL_TREE, regInfo[i].gccName); |
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376 clobbers.push_back(regInfo[i].gccName); |
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377 } |
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378 } |
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379 if (clobbers_mem) |
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380 clobbers.push_back(memory_name); |
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381 //clobbers.cons(NULL_TREE, memory_name); |
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382 // } |
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383 |
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384 |
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385 // Remap argument numbers |
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386 for (unsigned i = 0; i < code->args.dim; i++) { |
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387 if (arg_map[i] < 0) |
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388 arg_map[i] = -arg_map[i] - 1 + n_outputs; |
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389 } |
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390 |
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391 bool pct = false; |
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392 char * p = code->insnTemplate; |
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393 char * q = p + code->insnTemplateLen; |
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394 //printf("start: %.*s\n", code->insnTemplateLen, code->insnTemplate); |
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395 while (p < q) { |
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396 if (pct) { |
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397 if (*p >= '0' && *p <= '9') { |
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398 // %% doesn't check against nargs |
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399 *p = '0' + arg_map[*p - '0']; |
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400 pct = false; |
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401 } else if (*p == '$') { |
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402 pct = false; |
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403 } |
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404 //assert(*p == '%');// could be 'a', etc. so forget it.. |
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405 } else if (*p == '$') |
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406 pct = true; |
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407 ++p; |
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408 } |
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409 |
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410 printf("final: %.*s\n", code->insnTemplateLen, code->insnTemplate); |
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411 |
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412 std::string insnt(code->insnTemplate, code->insnTemplateLen); |
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413 |
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414 // rewrite GCC-style constraints to LLVM-style constraints |
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415 std::string llvmOutConstraints; |
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416 std::string llvmInConstraints; |
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417 int n = 0; |
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418 typedef std::deque<std::string>::iterator it; |
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419 for(it i = output_constraints.begin(), e = output_constraints.end(); i != e; ++i, ++n) { |
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420 // rewrite update constraint to in and out constraints |
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421 if((*i)[0] == '+') { |
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422 (*i)[0] = '='; |
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423 std::string input_constraint; |
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424 std::stringstream ss; |
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425 ss << n; |
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426 ss >> input_constraint; |
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427 //FIXME: I think multiple inout constraints will mess up the order! |
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428 input_constraints.push_front(input_constraint); |
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429 input_values.push_front(output_values[n]); |
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430 } |
232
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431 llvmOutConstraints += *i; |
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432 llvmOutConstraints += ","; |
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433 } |
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434 for(it i = input_constraints.begin(), e = input_constraints.end(); i != e; ++i) { |
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435 llvmInConstraints += *i; |
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436 llvmInConstraints += ","; |
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437 } |
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438 |
233
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439 std::string clobstr; |
232
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440 for(it i = clobbers.begin(), e = clobbers.end(); i != e; ++i) { |
233
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441 clobstr = "~{" + *i + "},"; |
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442 asmblock->clobs.insert(clobstr); |
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443 } |
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444 |
232
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445 // excessive commas are removed later... |
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446 |
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447 // push asm statement |
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448 IRAsmStmt* asmStmt = new IRAsmStmt; |
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449 asmStmt->code = insnt; |
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450 asmStmt->out_c = llvmOutConstraints; |
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451 asmStmt->in_c = llvmInConstraints; |
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452 asmStmt->out.insert(asmStmt->out.begin(), output_values.begin(), output_values.end()); |
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453 asmStmt->in.insert(asmStmt->in.begin(), input_values.begin(), input_values.end()); |
233
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454 asmblock->s.push_back(asmStmt); |
232
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455 } |
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456 |
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457 ////////////////////////////////////////////////////////////////////////////// |
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458 |
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459 AsmBlockStatement::AsmBlockStatement(Loc loc, Statements* s) |
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460 : CompoundStatement(loc, s) |
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461 { |
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462 } |
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|
463 |
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464 // rewrite argument indices to the block scope indices |
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465 static void remap_outargs(std::string& insnt, size_t nargs, size_t& idx) |
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466 { |
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467 static const std::string digits[10] = |
220
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468 { |
232
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469 "0","1","2","3","4", |
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470 "5","6","7","8","9" |
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471 }; |
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472 assert(nargs <= 10); |
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|
473 |
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474 static const std::string prefix("<<<out"); |
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475 static const std::string suffix(">>>"); |
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476 std::string argnum; |
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|
477 std::string needle; |
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478 char buf[10]; |
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479 for (unsigned i = 0; i < nargs; i++) { |
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480 needle = prefix + digits[i] + suffix; |
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481 sprintf(buf, "%u", idx++); |
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482 insnt.replace(insnt.find(needle), needle.size(), buf); |
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|
483 } |
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|
484 } |
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|
485 |
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|
486 // rewrite argument indices to the block scope indices |
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487 static void remap_inargs(std::string& insnt, size_t nargs, size_t& idx) |
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488 { |
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489 static const std::string digits[10] = |
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490 { |
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|
491 "0","1","2","3","4", |
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492 "5","6","7","8","9" |
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493 }; |
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|
494 assert(nargs <= 10); |
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|
495 |
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|
496 static const std::string prefix("<<<in"); |
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497 static const std::string suffix(">>>"); |
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498 std::string argnum; |
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|
499 std::string needle; |
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|
500 char buf[10]; |
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501 for (unsigned i = 0; i < nargs; i++) { |
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502 needle = prefix + digits[i] + suffix; |
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503 sprintf(buf, "%u", idx++); |
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504 insnt.replace(insnt.find(needle), needle.size(), buf); |
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|
505 } |
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|
506 } |
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|
507 |
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508 void AsmBlockStatement::toIR(IRState* p) |
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509 { |
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510 Logger::println("AsmBlockStatement::toIR(): %s", loc.toChars()); |
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511 LOG_SCOPE; |
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512 Logger::println("BEGIN ASM"); |
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513 |
233
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514 // create asm block structure |
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515 assert(!p->asmBlock); |
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516 IRAsmBlock* asmblock = new IRAsmBlock; |
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517 p->asmBlock = asmblock; |
232
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|
518 |
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|
519 // do asm statements |
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|
520 for (int i=0; i<statements->dim; i++) |
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|
521 { |
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|
522 Statement* s = (Statement*)statements->data[i]; |
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523 if (s) { |
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|
524 s->toIR(p); |
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|
525 } |
220
ccc2e6898a78
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|
526 } |
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|
527 |
232
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528 // build asm block |
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529 std::vector<LLValue*> outargs; |
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530 std::vector<LLValue*> inargs; |
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531 std::vector<const LLType*> outtypes; |
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532 std::vector<const LLType*> intypes; |
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533 std::string out_c; |
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534 std::string in_c; |
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535 std::string clobbers; |
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536 std::string code; |
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537 size_t asmIdx = 0; |
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538 |
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539 size_t n = asmblock->s.size(); |
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540 for (size_t i=0; i<n; ++i) |
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541 { |
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542 IRAsmStmt* a = asmblock->s[i]; |
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543 assert(a); |
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544 size_t onn = a->out.size(); |
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545 for (size_t j=0; j<onn; ++j) |
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546 { |
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547 outargs.push_back(a->out[j]); |
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548 outtypes.push_back(a->out[j]->getType()); |
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549 } |
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550 if (!a->out_c.empty()) |
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551 { |
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552 out_c += a->out_c; |
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553 } |
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554 remap_outargs(a->code, onn, asmIdx); |
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555 } |
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556 for (size_t i=0; i<n; ++i) |
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557 { |
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558 IRAsmStmt* a = asmblock->s[i]; |
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559 assert(a); |
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560 size_t inn = a->in.size(); |
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561 for (size_t j=0; j<inn; ++j) |
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562 { |
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563 inargs.push_back(a->in[j]); |
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564 intypes.push_back(a->in[j]->getType()); |
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565 } |
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566 if (!a->in_c.empty()) |
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567 { |
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568 in_c += a->in_c; |
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569 } |
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570 remap_inargs(a->code, inn, asmIdx); |
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571 if (!code.empty()) |
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572 code += " ; "; |
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573 code += a->code; |
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574 } |
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575 asmblock->s.clear(); |
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576 |
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577 // append inputs |
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578 out_c += in_c; |
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579 |
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580 // append clobbers |
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581 typedef std::set<std::string>::iterator clobs_it; |
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582 for (clobs_it i=asmblock->clobs.begin(); i!=asmblock->clobs.end(); ++i) |
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583 { |
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584 out_c += *i; |
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585 } |
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586 |
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587 // remove excessive comma |
232
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588 if (!out_c.empty()) |
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589 out_c.resize(out_c.size()-1); |
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590 |
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591 Logger::println("code = \"%s\"", code.c_str()); |
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592 Logger::println("constraints = \"%s\"", out_c.c_str()); |
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593 |
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594 std::vector<const LLType*> types; |
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595 types.insert(types.end(), outtypes.begin(), outtypes.end()); |
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596 types.insert(types.end(), intypes.begin(), intypes.end()); |
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597 llvm::FunctionType* fty = llvm::FunctionType::get(llvm::Type::VoidTy, types, false); |
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598 Logger::cout() << "function type = " << *fty << '\n'; |
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599 llvm::InlineAsm* ia = llvm::InlineAsm::get(fty, code, out_c, true); |
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600 |
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601 std::vector<LLValue*> args; |
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602 args.insert(args.end(), outargs.begin(), outargs.end()); |
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603 args.insert(args.end(), inargs.begin(), inargs.end()); |
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604 llvm::CallInst* call = p->ir->CreateCall(ia, args.begin(), args.end(), ""); |
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605 |
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606 p->asmBlock = NULL; |
232
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607 Logger::println("END ASM"); |
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608 } |
232
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609 |
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610 // the whole idea of this statement is to avoid the flattening |
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611 Statements* AsmBlockStatement::flatten(Scope* sc) |
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612 { |
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613 return NULL; |
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614 } |