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0
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1 module dmd.AsmStatement;
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2
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114
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3 import dmd.common;
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0
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4 import dmd.Loc;
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5 import dmd.Statement;
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6 import dmd.Token;
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7 import dmd.Scope;
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8 import dmd.OutBuffer;
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9 import dmd.HdrGenState;
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10 import dmd.IRState;
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11 import dmd.BE;
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12 import dmd.LabelDsymbol;
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13 import dmd.Dsymbol;
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14 import dmd.Id;
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15 import dmd.TOK;
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16 import dmd.Global;
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17 import dmd.FuncDeclaration;
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18 import dmd.Declaration;
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19 import dmd.LabelStatement;
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20 import dmd.Util;
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21
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22 import dmd.backend.code;
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23 import dmd.backend.iasm;
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24 import dmd.backend.block;
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25 import dmd.backend.Blockx;
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26 import dmd.backend.Util;
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27 import dmd.codegen.Util;
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28 import dmd.backend.BC;
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29 import dmd.backend.FL;
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30 import dmd.backend.SFL;
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31 import dmd.backend.SC;
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32 import dmd.backend.mTY;
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33 import dmd.backend.Symbol;
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34 import dmd.backend.LIST;
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35
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36 import core.stdc.string : memset;
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37 import core.stdc.stdlib : exit, EXIT_FAILURE;
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38
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39 class AsmStatement : Statement
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40 {
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41 Token* tokens;
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42 code* asmcode;
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43 uint asmalign; // alignment of this statement
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44 bool refparam; // true if function parameter is referenced
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45 bool naked; // true if function is to be naked
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46 uint regs; // mask of registers modified
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47
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48 this(Loc loc, Token* tokens)
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49 {
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50 super(loc);
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51 this.tokens = tokens;
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52 }
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53
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72
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54 override Statement syntaxCopy()
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0
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55 {
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56 assert(false);
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57 }
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58
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72
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59 override Statement semantic(Scope sc)
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0
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60 {
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61 //printf("AsmStatement.semantic()\n");
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62
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63 if (global.params.safe && !sc.module_.safe)
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64 {
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65 error("inline assembler not allowed in safe mode");
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66 }
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67
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68 OP* o;
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69 OPND* o1 = null;
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70 OPND* o2 = null;
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71 OPND* o3 = null;
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72
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73 PTRNTAB ptb;
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74 uint usNumops;
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75 ubyte uchPrefix = 0;
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76 ubyte bAsmseen;
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77 char* pszLabel = null;
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78 code* c;
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79 FuncDeclaration fd = sc.parent.isFuncDeclaration();
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80
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81 assert(fd);
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82 fd.inlineAsm = 1;
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83
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84 if (!tokens)
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85 return null;
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86
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87 memset(&asmstate, 0, asmstate.sizeof);
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88
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89 asmstate.statement = this;
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90 asmstate.sc = sc;
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91
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92 static if (false) {
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93 // don't use bReturnax anymore, and will fail anyway if we use return type inference
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94 // Scalar return values will always be in AX. So if it is a scalar
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95 // then asm block sets return value if it modifies AX, if it is non-scalar
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96 // then always assume that the ASM block sets up an appropriate return
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97 // value.
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98
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99 asmstate.bReturnax = 1;
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100 if (sc.func.type.nextOf().isscalar())
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101 asmstate.bReturnax = 0;
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102 }
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103
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104 // Assume assembler code takes care of setting the return value
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105 sc.func.hasReturnExp |= 8;
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106
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107 if (!asmstate.bInit)
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108 {
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109 asmstate.bInit = true;
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110 init_optab();
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111 asmstate.psDollar = new LabelDsymbol(Id.__dollar);
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112 //asmstate.psLocalsize = new VarDeclaration(0, Type.tint32, Id.__LOCAL_SIZE, null);
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113 asmstate.psLocalsize = new Dsymbol(Id.__LOCAL_SIZE);
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114 cod3_set386();
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115 }
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116
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117 asmstate.loc = loc;
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118
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119 asmtok = tokens;
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120 asm_token_trans(asmtok);
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121 if (setjmp(asmstate.env))
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122 {
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123 asmtok = null; // skip rest of line
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124 tok_value = TOK.TOKeof;
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125 exit(EXIT_FAILURE);
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126 goto AFTER_EMIT;
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127 }
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128
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129 switch (cast(int)tok_value)
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130 {
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131 case ASMTK.ASMTKnaked:
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132 naked = true;
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133 sc.func.naked = true;
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134 asm_token();
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135 break;
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136
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137 case ASMTK.ASMTKeven:
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138 asm_token();
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139 asmalign = 2;
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140 break;
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141
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142 case TOK.TOKalign:
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143 {
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144 asm_token();
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145 uint align_ = asm_getnum();
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146 if (ispow2(align_) == -1)
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147 asmerr(ASMERRMSGS.EM_align, align_); // power of 2 expected
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148 else
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149 asmalign = align_;
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150 break;
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151 }
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152
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153 // The following three convert the keywords 'int', 'in', 'out'
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154 // to identifiers, since they are x86 instructions.
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155 case TOK.TOKint32:
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156 o = asm_op_lookup(Id.__int.toChars());
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157 goto Lopcode;
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158
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159 case TOK.TOKin:
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160 o = asm_op_lookup(Id.___in.toChars());
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161 goto Lopcode;
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162
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163 case TOK.TOKout:
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164 o = asm_op_lookup(Id.___out.toChars());
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165 goto Lopcode;
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166
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167 case TOK.TOKidentifier:
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168 o = asm_op_lookup(asmtok.ident.toChars());
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169 if (!o)
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170 goto OPCODE_EXPECTED;
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171
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172 Lopcode:
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173 asmstate.ucItype = o.usNumops & IT.ITMASK;
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174 asm_token();
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175 if (o.usNumops > 3)
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176 {
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177 switch (asmstate.ucItype)
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178 {
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179 case IT.ITdata:
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180 asmcode = asm_db_parse(o);
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181 goto AFTER_EMIT;
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182
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183 case IT.ITaddr:
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184 asmcode = asm_da_parse(o);
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185 goto AFTER_EMIT;
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186
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187 default:
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188 break;
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189 }
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190 }
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191 // get the first part of an expr
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192 o1 = asm_cond_exp();
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193 if (tok_value == TOK.TOKcomma)
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194 {
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195 asm_token();
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196 o2 = asm_cond_exp();
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197 }
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198 if (tok_value == TOK.TOKcomma)
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199 {
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200 asm_token();
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201 o3 = asm_cond_exp();
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202 }
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203 // match opcode and operands in ptrntab to verify legal inst and
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204 // generate
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205
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206 ptb = asm_classify(o, o1, o2, o3, &usNumops);
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207 assert(ptb.pptb0);
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208
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209 //
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210 // The Multiply instruction takes 3 operands, but if only 2 are seen
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211 // then the third should be the second and the second should
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212 // be a duplicate of the first.
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213 //
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214
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215 if (asmstate.ucItype == IT.ITopt &&
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216 (usNumops == 2) &&
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217 (ASM_GET_aopty(o2.usFlags) == ASM_OPERAND_TYPE._imm) &&
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218 ((o.usNumops & IT.ITSIZE) == 3))
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219 {
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220 o3 = o2;
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221 o2 = opnd_calloc();
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222 *o2 = *o1;
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223
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224 // Re-classify the opcode because the first classification
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225 // assumed 2 operands.
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226
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227 ptb = asm_classify(o, o1, o2, o3, &usNumops);
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228 }
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229 else
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230 {
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231 static if (false) {
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232 if (asmstate.ucItype == IT.ITshift && (ptb.pptb2.usOp2 == 0 ||
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233 (ptb.pptb2.usOp2 & _cl))) {
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234 opnd_free(o2);
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235 o2 = null;
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236 usNumops = 1;
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237 }
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238 }
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239 }
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240
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241 asmcode = asm_emit(loc, usNumops, ptb, o, o1, o2, o3);
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242 break;
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243
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244 default:
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245 OPCODE_EXPECTED:
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246 asmerr(ASMERRMSGS.EM_opcode_exp, asmtok.toChars()); // assembler opcode expected
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247 break;
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248 }
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249
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250 AFTER_EMIT:
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251 opnd_free(o1);
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252 opnd_free(o2);
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253 opnd_free(o3);
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254 o1 = o2 = o3 = null;
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255
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256 if (tok_value != TOK.TOKeof)
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257 asmerr(ASMERRMSGS.EM_eol); // end of line expected
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258
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259 //return asmstate.bReturnax;
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260 return this;
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261 }
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262
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263 override BE blockExit()
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264 {
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265 assert(false);
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266 }
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267
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268 override bool comeFrom()
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269 {
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270 assert(false);
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271 }
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272
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273 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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0
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274 {
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275 assert(false);
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276 }
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277
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278 override AsmStatement isAsmStatement() { return this; }
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279
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280 override void toIR(IRState *irs)
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281 {
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282 block* bpre;
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283 block* basm;
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284 Declaration d;
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285 Symbol* s;
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286 Blockx* blx = irs.blx;
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287
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288 // dumpCode(asmcode);
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289
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290 //printf("AsmStatement::toIR(asmcode = %x)\n", asmcode);
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291 bpre = blx.curblock;
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292 block_next(blx,BCgoto,null);
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293 basm = blx.curblock;
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294 list_append(&bpre.Bsucc, basm);
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295 basm.Bcode = asmcode;
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296 basm.Balign = cast(ubyte)asmalign;
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297 static if (false) {
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298 if (label)
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299 {
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300 block* b = labelToBlock(loc, blx, label);
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301 printf("AsmStatement::toIR() %p\n", b);
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302 if (b)
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303 list_append(&basm.Bsucc, b);
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304 }
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305 }
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306 // Loop through each instruction, fixing Dsymbols into Symbol's
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307 for (code* c = asmcode; c; c = c.next)
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308 {
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309 LabelDsymbol label;
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310 block* b;
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311
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312 switch (c.IFL1)
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313 {
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314 case FLblockoff:
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315 case FLblock:
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316 // FLblock and FLblockoff have LabelDsymbol's - convert to blocks
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317 label = c.IEVlsym1;
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318 b = labelToBlock(loc, blx, label);
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319 list_append(&basm.Bsucc, b);
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320 c.IEV1.Vblock = b;
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321 break;
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322
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323 case FLdsymbol:
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324 case FLfunc:
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325 s = c.IEVdsym1.toSymbol();
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326 if (s.Sclass == SCauto && s.Ssymnum == -1)
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327 symbol_add(s);
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328 c.IEVsym1() = s;
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329 c.IFL1 = s.Sfl ? s.Sfl : FLauto;
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330 break;
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331 default:
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332 break;
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333 }
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334
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335 // Repeat for second operand
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336 switch (c.IFL2)
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337 {
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338 case FLblockoff:
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339 case FLblock:
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340 label = c.IEVlsym2;
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341 b = labelToBlock(loc, blx, label);
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342 list_append(&basm.Bsucc, b);
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343 c.IEV2.Vblock = b;
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344 break;
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345
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346 case FLdsymbol:
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347 case FLfunc:
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348 d = c.IEVdsym2;
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349 s = d.toSymbol();
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350 if (s.Sclass == SCauto && s.Ssymnum == -1)
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351 symbol_add(s);
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352 c.IEVsym2() = s;
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353 c.IFL2 = s.Sfl ? s.Sfl : FLauto;
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354 if (d.isDataseg())
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355 s.Sflags |= SFLlivexit;
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356 break;
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357 default:
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358 break;
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359 }
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360 //c.print();
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361 }
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362
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363 basm.bIasmrefparam = refparam; // are parameters reference?
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364 basm.usIasmregs = cast(ushort)regs; // registers modified
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365
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366 block_next(blx,BCasm, null);
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367 list_prepend(&basm.Bsucc, blx.curblock);
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368
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369 if (naked)
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370 {
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371 blx.funcsym.Stype.Tty |= mTYnaked;
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372 }
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373 }
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72
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374 }
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