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annotate gen/dvalue.h @ 1168:ab186e535e72

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A different fix to #218 and DMD2682 that does not lead to constant folding regressions. Fixes run/const_15, run/c/const_16_B. The price is removing the lvalueness of struct literals. If it turns out too much code depends on this behavior or we don't want to break with DMD, we could keep struct literals as lvalues and instead convert struct literals used as expression initializers into struct initializers.
author Christian Kamm <kamm incasoftware de>
date Sun, 29 Mar 2009 11:43:45 +0200
parents 3cf0066e6faf
children f5729209a1d4
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eef8ac26c66c Some missed LLVMDC -> LDC.
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1 #ifndef LDC_GEN_DVALUE_H
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2 #define LDC_GEN_DVALUE_H
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3
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4 /*
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5 These classes are used for generating the IR. They encapsulate D values and
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6 provide a common interface to the most common operations. When more specialized
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7 handling is necessary, they hold enough information to do-the-right-thing (TM)
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8 */
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9
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10 #include <cassert>
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11 #include "root.h"
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12
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13 struct Type;
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14 struct Dsymbol;
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15 struct VarDeclaration;
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16 struct FuncDeclaration;
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17
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18 namespace llvm
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19 {
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20 class Value;
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21 class Type;
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22 class Constant;
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23 }
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24
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25 struct DImValue;
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26 struct DConstValue;
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27 struct DNullValue;
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28 struct DVarValue;
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29 struct DFieldValue;
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30 struct DFuncValue;
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31 struct DSliceValue;
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32
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33 // base class for d-values
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34 struct DValue : Object
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35 {
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36 virtual Type*& getType() = 0;
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37
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38 virtual LLValue* getLVal() { assert(0); return 0; }
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39 virtual LLValue* getRVal() { assert(0); return 0; }
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40
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41 virtual bool isLVal() { return false; }
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42
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43 virtual DImValue* isIm() { return NULL; }
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44 virtual DConstValue* isConst() { return NULL; }
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45 virtual DNullValue* isNull() { return NULL; }
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46 virtual DVarValue* isVar() { return NULL; }
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47 virtual DFieldValue* isField() { return NULL; }
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48 virtual DSliceValue* isSlice() { return NULL; }
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49 virtual DFuncValue* isFunc() { return NULL; }
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50
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51 protected:
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52 DValue() {}
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53 DValue(const DValue&) { }
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54 DValue& operator=(const DValue&) { return *this; }
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55 };
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56
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57 // immediate d-value
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58 struct DImValue : DValue
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59 {
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60 Type* type;
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61 LLValue* val;
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62
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63 DImValue(Type* t, LLValue* v) : type(t), val(v) { }
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64
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65 virtual LLValue* getRVal() { assert(val); return val; }
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67 virtual Type*& getType() { assert(type); return type; }
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68 virtual DImValue* isIm() { return this; }
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69 };
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70
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71 // constant d-value
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72 struct DConstValue : DValue
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73 {
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74 Type* type;
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75 LLConstant* c;
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77 DConstValue(Type* t, LLConstant* con) { type = t; c = con; }
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79 virtual LLValue* getRVal();
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81 virtual Type*& getType() { assert(type); return type; }
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82 virtual DConstValue* isConst() { return this; }
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83 };
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84
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85 // null d-value
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86 struct DNullValue : DConstValue
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87 {
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88 DNullValue(Type* t, LLConstant* con) : DConstValue(t,con) {}
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89 virtual DNullValue* isNull() { return this; }
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90 };
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91
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92 // variable d-value
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93 struct DVarValue : DValue
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94 {
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95 Type* type;
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96 VarDeclaration* var;
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97 LLValue* val;
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98
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99 DVarValue(Type* t, VarDeclaration* vd, LLValue* llvmValue);
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100 DVarValue(Type* t, LLValue* llvmValue);
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101
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102 virtual bool isLVal() { return true; }
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103 virtual LLValue* getLVal();
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104 virtual LLValue* getRVal();
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106 virtual Type*& getType() { assert(type); return type; }
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107 virtual DVarValue* isVar() { return this; }
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108 };
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109
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110 // field d-value
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111 struct DFieldValue : DVarValue
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112 {
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113 DFieldValue(Type* t, LLValue* llvmValue) : DVarValue(t, llvmValue) {}
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114 virtual DFieldValue* isField() { return this; }
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115 };
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116
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117 // slice d-value
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118 struct DSliceValue : DValue
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119 {
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120 Type* type;
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121 LLValue* len;
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122 LLValue* ptr;
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123
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124 DSliceValue(Type* t, LLValue* l, LLValue* p) { type=t; ptr=p; len=l; }
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125
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126 virtual LLValue* getRVal();
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127
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128 virtual Type*& getType() { assert(type); return type; }
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129 virtual DSliceValue* isSlice() { return this; }
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130 };
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131
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132 // function d-value
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133 struct DFuncValue : DValue
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134 {
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135 Type* type;
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136 FuncDeclaration* func;
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137 LLValue* val;
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138 LLValue* vthis;
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139
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140 DFuncValue(FuncDeclaration* fd, LLValue* v, LLValue* vt = 0);
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7816aafeea3c [svn r229] Updated the object.d implementation to the latest Tango.
lindquist
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142 virtual LLValue* getRVal();
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932229a851a4 [svn r382] In CastExp, after the cast to CastExp.to force the type to be CastExp.type.
ChristianK
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144 virtual Type*& getType() { assert(type); return type; }
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145 virtual DFuncValue* isFunc() { return this; }
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146 };
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147
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eef8ac26c66c Some missed LLVMDC -> LDC.
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148 #endif // LDC_GEN_DVALUE_H