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annotate basic/SourceLocation.d @ 164:ba94fd563548

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The symbol for the constructor a "new"-exp is calling is now stored in callSym in NewExp.
author Anders Johnsen <skabet@gmail.com>
date Tue, 22 Jul 2008 16:53:47 +0200
parents 6ec686d9c87d
children
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1 module basic.SourceLocation;
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2
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3 import Integer = tango.text.convert.Integer;
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4
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5 /// Shorter alias for SourceLocation
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6 public alias SourceLocation SLoc;
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7
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8 /// SourceLocation points to a place in some buffer
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9 struct SourceLocation
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10 {
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11 /// Returns true, if the location is from a real file
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12 bool isReal() { return (val & 0x80_00_00_00) == 0; }
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13 /// Returns true, if the location is not from a real file
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14 bool isVirtual() { return (val & 0x80_00_00_00) != 0; }
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15
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16 /// Check if this location is invalid or not
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17 bool isValid() { return val != uint.max; }
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18 /// ditto
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19 bool isInvalid() { return val == uint.max; }
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20
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21 /**
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22 Extracts the file id.
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23
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24 Warning: In release mode this may return junk, if the loc is not from a
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25 file
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26 **/
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27 uint fileID() {
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28 assert(isValid, "Location is invalid");
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29 assert(isReal, "You can only extract fileID from a real location");
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30 // Here we can rely on two facts, first that the high bit is zero
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31 // since its a real position, second that FileOffset is saved in the
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32 // high end, so all we need is some shifting
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33 return val >> Bits.FileOffset;
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34 }
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35
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36 /**
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37 Extracts the offset into the "file". (actually in to the referenced
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38 chunk)
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39
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40 Warning: In release mode this may return junk, if the loc is not from a
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41 file
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42 **/
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43 uint fileOffset() {
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44 assert(isValid, "Location is invalid");
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45 assert(isReal, "You can only extract fileOffset from real locations");
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46 // FileOffset is stored in the lower bits, so all that is needed is a
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47 // binary and with all ones in the lower bits.
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48 return val & (1 << Bits.FileOffset) - 1;
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49 }
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50
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51 /// Get a new location, placed n bytes after the given location
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52 SourceLocation opAdd(int n)
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53 {
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54 SourceLocation res = *this;
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55 res.val += n;
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56 return res;
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57 }
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58
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59 /// Get a new location, placed n bytes before the given location
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60 SourceLocation opSub(int n)
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61 {
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62 SourceLocation res = *this;
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63 res.val -= n;
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64 return res;
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65 }
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66
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67 /// Get the length between two location
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68 int opSub(SourceLocation loc)
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69 {
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70 return val - loc.val;
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71 }
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72
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73 /// Creates a SourceLocation from a File ID
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74 static SourceLocation fromFileID(uint fileID)
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75 {
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76 assert(fileID < Bits.MaxFileID, "To large fileID");
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77 SourceLocation res;
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78 res.val = fileID << Bits.FileOffset;
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79 return res;
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80 }
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81
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82 char[] toString()
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83 {
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84 return Integer.toString(val);
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85 }
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86 /**
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87 Used for invalid/unknown locations. (also the default value, but this is
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88 more explicit)
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89 **/
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90 static const SourceLocation Invalid = {val: uint.max};
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91
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92 private:
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93 /**
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94 A SourceLocation consists of 1 bit, indicating real or virtual, meaning
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95 if the location points to a file(real), a string mixin or has been
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96 affected by #line(virtual). That information is saved in the most
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97 significant bit.
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98 The rest depends on which type we are dealing with.
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99 Real:
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100 13 bits for a file identifier
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101 18 bits for offset into that "file" (one file may be split)
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102 Virtual:
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103 Unknown for now. Likely skewed toward more ids and some meta data
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104 An invalid location is uint.max, this might happen by accident but its
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105 unlikely.
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106 **/
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107 uint val = uint.max;
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108
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109 /**
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110 This enum contains some constants that are useful for manipulating
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111 SourceLocation's, like the size of various “members” of val.
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112 **/
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113 static enum Bits {
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114 /// Number of bits used for the offset into file buffers
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115 FileOffset = 18,
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116 /// Number of bits used to identify which file buffer this is from
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117 FileID = 31 - FileOffset,
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118
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119 /// Indicates how much can be indexed within one block(2^FileOffset)
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120 MaxFileOffset = 1 << FileOffset,
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121 MaxFileID = 1 << FileID,
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122 }
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123 }
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124
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125 /// A simple pair used to describe a range in a buffer and not just a point.
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126 struct SourceRange
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127 {
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128 SourceLocation begin, end;
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129
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130 static SourceRange opCall(SourceLocation loc)
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131 {
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132 return SourceRange(loc, loc + 1);
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133 }
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134
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135 static SourceRange opCall(SourceLocation begin, SourceLocation end)
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136 {
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137 SourceRange res;
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138 res.begin = begin;
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139 res.end = end;
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140 return res;
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141 }
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142
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143 bool isValid() { return begin.isValid && end.isValid; }
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144 bool isInvalid() { return begin.isInvalid || end.isInvalid; }
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145
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146 bool isReal() { return begin.isReal && end.isReal; }
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147
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148 /// Get a new range spanning both ranges
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149 SourceRange opAdd(SourceRange that)
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150 {
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151 assert(this.isValid && that.isValid, "Invalid range");
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152 return SourceRange(
eb5b2c719a39 Major change to locations, tokens and expressions.
Anders Halager <halager@gmail.com>
parents:
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153 this.begin.val < that.begin.val? this.begin : that.begin,
eb5b2c719a39 Major change to locations, tokens and expressions.
Anders Halager <halager@gmail.com>
parents:
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154 this.end.val > that.end.val? this.end : that.end);
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Anders Halager <halager@gmail.com>
parents:
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155 }
eb5b2c719a39 Major change to locations, tokens and expressions.
Anders Halager <halager@gmail.com>
parents:
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156 }
eb5b2c719a39 Major change to locations, tokens and expressions.
Anders Halager <halager@gmail.com>
parents:
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157