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1 require "ldyntype"
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2
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3 -- utilities
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4
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5 local function align(x, align)
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6 return math.floor( ( x + (align-1) ) / align ) * align
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7 end
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8
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9 -- typeinfo table constructors
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10
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11 function typeinfo_base(signature, size, align)
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12 return { name = signature, signature = signature, class = "base", size = size, align = align }
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13 end
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14
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15 function typeinfo_ptr(signature, basetypeinfo, ptrlevels)
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16 return { name = signature, signature = signature, class = "ptr", basetypeinfo = basetypeinfo, ptrlevels = ptrlevels, size = _TI.p.size, align = _TI.p.align }
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17 end
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18
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19 function typeinfo_struct(name, signature, size, align, fields)
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20 return { name = name, signature = signature, class = "struct" , size = size, align = align , fields = fields }
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21 end
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22
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23 local function istypeinfo(typespec)
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24 return type(typespec) == "table"
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25 end
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26
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27 function typeinfo_tostring(typename)
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28 local ti = gettypeinfo(typename)
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29 local s = ti.name .. "\tsize=" .. ti.size .. "\talign=" .. ti.align
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30 if ti.basetypeinfo then
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31 local baseti = gettypeinfo(ti.basetypeinfo)
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32 if baseti.name then
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33 s = s .. "\tbase=" .. baseti.name
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34 else
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35 s = s .. "\tbase=" .. baseti
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36 end
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37 end
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38 if ti.fields then
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39 for k, v in pairs(ti.fields) do
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40 s = s .. "\n- "..k .. ":\toffset=" .. v.offset
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41 end
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42 end
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43 return s
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44 end
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45
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46
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47 -- typeinfo registry
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48
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49 _TI = { }
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50
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51 function settypeinfo(name,info)
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52 _TI[name] = info
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53 end
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54
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55 function gettypeinfo(typespec)
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56 if istypeinfo(typespec) then return typespec end
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57 local typeinfo = _TI[typespec]
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58 if not typeinfo then -- pointer type ?
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59 local ptrs, basename = typespec:match("(%**)<(%a+)>")
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60 if ptrs and basename then -- pointer type signature:
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61 typeinfo = typeinfo_ptr( typespec, gettypeinfo(basename), #ptrs)
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62 settypeinfo(typespec, typeinfo)
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63 end -- else, typespec remains a string (unknown type)
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64 end
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65 return typeinfo
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66 end
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67
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68 function dumptypeinfos()
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69 for k,v in pairs(_TI) do
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70 print(typeinfo_tostring(v))
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71 end
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72 end
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73
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74 function dumptypeinfo(x)
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75 print(typeinfo_tostring(x))
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76 end
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77
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78 --
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79
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80 local function regbasetypes()
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81 local sigs = "BcCsSiIjJlLpZ"
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82 for typechar in sigs:gmatch(".") do
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83 settypeinfo(typechar, typeinfo_base( typechar, ldyntype.dtSize(typechar), ldyntype.dtAlign(typechar) ) )
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84 end
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85 end
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86
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87 function regstructinfo(structsignature)
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88 local name, typeclass, signature, fieldnames = structsignature:match("(%a+)([{|])(.+)%}(.+)")
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89
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90 if name and type and signature then
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91 local offset = 0
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92 local maxalign = 0
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93 local maxsize = 0
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94 local fields = { }
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95
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96 local fieldname = signature:gmatch("(%S+)")
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97
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98 for typespec, fieldname in signature:gmatch("(%S)") do
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99
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100 local typeinfo = gettypeinfo(typespec)
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101
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102 offset = align(offset, typeinfo.align)
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103 maxalign = math.max(typeinfo.align,maxalign)
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104 maxsize = math.max(typeinfo.size, maxsize)
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105
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106 fields[fieldname] = { offset = offset, typeinfo = typeinfo }
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107
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108 if typeclass == "{" then -- structure
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109 offset = offset + typeinfo.size
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110 end
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111
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112 end
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113
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114 local structsize
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115
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116 if typeclass == "|" then
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117 structsize = maxsize
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118 else
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119 structsize = offset
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120 end
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121
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122 settypeinfo(name, typeinfo_struct(name, signature, structsize, maxalign, fields) )
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123 end
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124
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125 end
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126
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127 function regstructinfo_backup(structsignature)
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128 local name, typeclass, signature = structsignature:match("(%a+)([{|])(.+)%}")
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129
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130 if name and type and signature then
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131 local offset = 0
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132 local maxalign = 0
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133 local maxsize = 0
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134 local fields = { }
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135 for typespec, fieldname in signature:gmatch("(%S+)%s+(%S+)") do
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136
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137 local typeinfo = gettypeinfo(typespec)
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138
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139 offset = align(offset, typeinfo.align)
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140 maxalign = math.max(typeinfo.align,maxalign)
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141 maxsize = math.max(typeinfo.size, maxsize)
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142
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143 fields[fieldname] = { offset = offset, typeinfo = typeinfo }
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144
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145 if typeclass == "{" then -- structure
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146 offset = offset + typeinfo.size
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147 end
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148
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149 end
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150
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151 local structsize
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152
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153 if typeclass == "|" then
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154 structsize = maxsize
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155 else
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156 structsize = offset
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157 end
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158
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159 settypeinfo(name, typeinfo_struct(name, signature, structsize, maxalign, fields) )
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160 end
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161
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162 end
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163
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164 function parsebasetypes(basetypesignature)
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165 for type,size,align in basetypesignature:gmatch("(%a+)%s+(%d)%s+(%d)%s*") do
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166 settypeinfo(type, {signature=type,base=type,class="storage",size=size,align=align})
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167 end
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168 end
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169
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170 -- initialize typeinfo registry
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171
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172 regbasetypes()
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173
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