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