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4 | |
4 | |
5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
6 | |
6 | |
7 | use Faster; |
7 | use Faster; |
8 | |
8 | |
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9 | perl -MFaster ... |
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10 | |
9 | =head1 DESCRIPTION |
11 | =head1 DESCRIPTION |
10 | |
12 | |
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13 | This module implements a very simple-minded JIT. It works by more or less |
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14 | translating every function it sees into a C program, compiling it and then |
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15 | replacing the function by the compiled code. |
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16 | |
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17 | As a result, startup times are immense, as every function might lead to a |
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18 | full-blown compilation. |
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19 | |
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20 | The speed improvements are also not great, you can expect 20% or so on |
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21 | average, for code that runs very often. |
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22 | |
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23 | Faster is in the early stages of development. Due to its design its |
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24 | relatively safe to use (it will either work or simply slowdown the program |
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25 | immensely, but rarely cause bugs). |
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26 | |
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27 | Usage is very easy, just C<use Faster> and every function called from then |
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28 | on will be compiled. |
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29 | |
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30 | Right now, Faster will leave ltos of F<*.c>, F<*.o> and F<*.so> files in |
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31 | F</tmp>, and it will even create those temporary files in an insecure |
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32 | manner, so watch out. |
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33 | |
11 | =over 4 |
34 | =over 4 |
12 | |
35 | |
13 | =cut |
36 | =cut |
14 | |
37 | |
15 | package Faster; |
38 | package Faster; |
16 | |
39 | |
17 | use strict; |
40 | use strict; |
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41 | use Config; |
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42 | use B (); |
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43 | use Digest::MD5 (); |
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44 | use DynaLoader (); |
18 | |
45 | |
19 | BEGIN { |
46 | BEGIN { |
20 | our $VERSION = '0.01'; |
47 | our $VERSION = '0.01'; |
21 | |
48 | |
22 | require XSLoader; |
49 | require XSLoader; |
23 | XSLoader::load __PACKAGE__, $VERSION; |
50 | XSLoader::load __PACKAGE__, $VERSION; |
24 | } |
51 | } |
25 | |
52 | |
26 | use B (); |
53 | my $COMPILE = "$Config{cc} -c -I$Config{archlibexp}/CORE $Config{optimize} $Config{ccflags} $Config{cccdlflags}"; |
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54 | my $LINK = "$Config{ld} $Config{ldflags} $Config{lddlflags} $Config{ccdlflags}"; |
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55 | my $LIBS = "$Config{libs}"; |
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56 | my $_o = $Config{_o}; |
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57 | my $_so = ".so"; |
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58 | |
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59 | # we don't need no steenking PIC on x86 |
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60 | $COMPILE =~ s/-f(?:PIC|pic)//g |
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61 | if $Config{archname} =~ /^(i[3456]86)-/; |
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62 | |
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63 | my $opt_assert = 1; |
27 | |
64 | |
28 | our $source; |
65 | our $source; |
29 | our $label_next; |
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30 | our $label_last; |
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31 | our $label_redo; |
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32 | |
66 | |
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67 | our @ops; |
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68 | our $op; |
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69 | our $op_name; |
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70 | our @op_loop; |
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71 | our %op_regcomp; |
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72 | |
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73 | my %flag; |
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74 | |
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75 | # complex flag steting is no longer required, rewrite this ugly code |
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76 | for (split /\n/, <<EOF) { |
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77 | leavesub unsafe |
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78 | leavesublv unsafe |
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79 | return unsafe |
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80 | flip unsafe |
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81 | goto unsafe |
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82 | last unsafe |
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83 | redo unsafe |
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84 | next unsafe |
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85 | eval unsafe |
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86 | leaveeval unsafe |
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87 | entertry unsafe |
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88 | formline unsafe |
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89 | grepstart unsafe |
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90 | mapstart unsafe |
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91 | substcont unsafe |
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92 | entereval unsafe noasync todo |
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93 | require unsafe |
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94 | |
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95 | mapstart noasync |
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96 | grepstart noasync |
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97 | match noasync |
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98 | |
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99 | last noasync |
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100 | next noasync |
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101 | redo noasync |
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102 | seq noasync |
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103 | pushmark noasync extend=0 |
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104 | padsv noasync extend=1 |
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105 | padav noasync extend=1 |
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106 | padhv noasync extend=1 |
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107 | padany noasync extend=1 |
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108 | entersub noasync |
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109 | aassign noasync |
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110 | sassign noasync |
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111 | rv2av noasync |
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112 | rv2cv noasync |
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113 | rv2gv noasync |
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114 | rv2hv noasync |
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115 | refgen noasync |
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116 | nextstate noasync |
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117 | gv noasync |
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118 | gvsv noasync |
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119 | add noasync |
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120 | subtract noasync |
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121 | multiply noasync |
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122 | divide noasync |
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123 | complement noasync |
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124 | cond_expr noasync |
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125 | and noasync |
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126 | or noasync |
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127 | not noasync |
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128 | defined noasync |
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129 | method_named noasync |
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130 | preinc noasync |
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131 | postinc noasync |
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132 | predec noasync |
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133 | postdec noasync |
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134 | stub noasync |
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135 | unstack noasync |
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136 | leaveloop noasync |
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137 | aelem noasync |
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138 | aelemfast noasync |
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139 | helem noasync |
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140 | pushre noasync |
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141 | subst noasync |
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142 | const noasync extend=1 |
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143 | list noasync |
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144 | join noasync |
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145 | split noasync |
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146 | concat noasync |
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147 | push noasync |
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148 | pop noasync |
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149 | shift noasync |
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150 | unshift noasync |
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151 | length noasync |
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152 | substr noasync |
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153 | stringify noasync |
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154 | eq noasync |
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155 | ne noasync |
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156 | gt noasync |
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157 | lt noasync |
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158 | ge noasync |
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159 | le noasync |
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160 | enteriter noasync |
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161 | ord noasync |
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162 | orassign noasync |
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163 | regcomp noasync |
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164 | regcreset noasync |
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165 | regcmaybe noasync |
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166 | |
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167 | iter async |
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168 | EOF |
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169 | my (undef, $op, @flags) = split /\s+/; |
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170 | |
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171 | undef $flag{$_}{$op} |
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172 | for ("known", @flags); |
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173 | } |
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174 | |
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175 | my %callop = ( |
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176 | entersub => "(PL_ppaddr [OP_ENTERSUB]) (aTHX)", |
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177 | mapstart => "Perl_pp_grepstart (aTHX)", |
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178 | ); |
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179 | |
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180 | sub callop { |
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181 | $callop{$op_name} || "Perl_pp_$op_name (aTHX)" |
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182 | } |
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183 | |
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184 | sub assert { |
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185 | return unless $opt_assert; |
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186 | $source .= " assert ((\"$op_name\", ($_[0])));\n"; |
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187 | } |
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188 | |
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189 | sub out_callop { |
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190 | assert "nextop == (OP *)$$op"; |
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191 | $source .= " PL_op = nextop; nextop = " . (callop $op) . ";\n"; |
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192 | } |
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193 | |
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194 | sub out_cond_jump { |
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195 | $source .= " if (nextop == (OP *)${$_[0]}L) goto op_${$_[0]};\n"; |
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196 | } |
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197 | |
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198 | sub out_jump_next { |
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199 | out_cond_jump $op_regcomp{$$op} |
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200 | if $op_regcomp{$$op}; |
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201 | |
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202 | assert "nextop == (OP *)${$op->next}"; |
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203 | $source .= " goto op_${$op->next};\n"; |
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204 | } |
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205 | |
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206 | sub out_next { |
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207 | $source .= " nextop = (OP *)${$op->next}L;\n"; |
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208 | |
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209 | out_jump_next; |
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210 | } |
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211 | |
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212 | sub out_linear { |
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213 | out_callop; |
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214 | out_jump_next; |
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215 | } |
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216 | |
33 | sub entersub { |
217 | sub op_entersub { |
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218 | out_callop; |
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219 | $source .= " RUNOPS_TILL ((OP *)${$op->next}L);\n"; |
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220 | out_jump_next; |
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221 | } |
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222 | |
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223 | *op_require = \&op_entersub; |
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224 | |
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225 | sub op_nextstate { |
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226 | $source .= " PL_curcop = (COP *)nextop;\n"; |
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227 | $source .= " PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;\n"; |
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228 | $source .= " FREETMPS;\n"; |
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229 | |
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230 | out_next; |
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231 | } |
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232 | |
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233 | sub op_pushmark { |
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234 | $source .= " PUSHMARK (PL_stack_sp);\n"; |
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235 | |
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236 | out_next; |
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237 | } |
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238 | |
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239 | if ($Config{useithreads} ne "define") { |
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240 | # disable optimisations on ithreads |
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241 | |
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242 | *op_const = sub { |
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243 | $source .= " { dSP; XPUSHs ((SV *)${$op->sv}L); PUTBACK; }\n"; |
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244 | |
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245 | out_next; |
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246 | }; |
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247 | |
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248 | *op_gv = \&op_const; |
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249 | |
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250 | *op_aelemfast = sub { |
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251 | my $targ = $op->targ; |
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252 | my $private = $op->private; |
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253 | |
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254 | $source .= " {\n"; |
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255 | |
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256 | if ($op->flags & B::OPf_SPECIAL) { |
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257 | $source .= " AV *av = (AV*)PAD_SV((PADOFFSET)$targ);\n"; |
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258 | } else { |
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259 | $source .= " AV *av = GvAV ((GV *)${$op->sv}L);\n"; |
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260 | } |
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261 | |
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262 | if ($op->flags & B::OPf_MOD) { |
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263 | $source .= " SV *sv = *av_fetch (av, $private, 1);\n"; |
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264 | } else { |
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265 | $source .= " SV **svp = av_fetch (av, $private, 0); SV *sv = svp ? *svp : &PL_sv_undef;\n"; |
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266 | } |
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267 | |
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268 | if (!($op->flags & B::OPf_MOD)) { |
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269 | $source .= " if (SvGMAGICAL (sv)) sv = sv_mortalcopy (sv);\n"; |
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270 | } |
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271 | |
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272 | $source .= " dSP;\n"; |
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273 | $source .= " XPUSHs (sv);\n"; |
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274 | $source .= " PUTBACK;\n"; |
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275 | $source .= " }\n"; |
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276 | |
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277 | out_next; |
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278 | }; |
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279 | |
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280 | *op_gvsv = sub { |
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281 | $source .= " {\n"; |
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282 | $source .= " dSP;\n"; |
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283 | $source .= " EXTEND (SP, 1);\n"; |
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284 | |
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285 | if ($op->private & B::OPpLVAL_INTRO) { |
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286 | $source .= " PUSHs (save_scalar ((GV *)${$op->sv}L));\n"; |
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287 | } else { |
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288 | $source .= " PUSHs (GvSV ((GV *)${$op->sv}L));\n"; |
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289 | } |
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290 | |
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291 | $source .= " PUTBACK;\n"; |
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292 | $source .= " }\n"; |
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293 | |
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294 | out_next; |
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295 | }; |
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296 | } |
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297 | |
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298 | # does kill Crossfire/res2pm |
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299 | sub op_stringify { |
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300 | my $targ = $op->targ; |
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301 | |
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302 | $source .= <<EOF; |
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303 | { |
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304 | dSP; |
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305 | SV *targ = PAD_SV ((PADOFFSET)$targ); |
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306 | sv_copypv (TARG, TOPs); |
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307 | SETTARG; |
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308 | PUTBACK; |
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309 | } |
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310 | EOF |
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311 | |
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312 | out_next; |
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313 | } |
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314 | |
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315 | sub op_and { |
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316 | $source .= <<EOF; |
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317 | { |
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318 | dSP; |
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319 | |
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320 | if (SvTRUE (TOPs)) |
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321 | { |
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322 | --SP; |
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323 | PUTBACK; |
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324 | nextop = (OP *)${$op->other}L; |
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325 | goto op_${$op->other}; |
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326 | } |
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327 | } |
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328 | EOF |
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329 | |
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330 | out_next; |
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331 | } |
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332 | |
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333 | sub op_or { |
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334 | $source .= <<EOF; |
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335 | { |
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336 | dSP; |
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337 | |
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338 | if (!SvTRUE (TOPs)) |
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339 | { |
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340 | --SP; |
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341 | PUTBACK; |
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342 | nextop = (OP *)${$op->other}L; |
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343 | goto op_${$op->other}; |
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344 | } |
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345 | } |
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346 | EOF |
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347 | |
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348 | out_next; |
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349 | } |
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350 | |
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351 | sub op_padsv { |
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352 | my $flags = $op->flags; |
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353 | my $target = $op->targ; |
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354 | |
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355 | $source .= <<EOF; |
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356 | { |
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357 | dSP; |
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358 | XPUSHs (PAD_SV ((PADOFFSET)$target)); |
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359 | PUTBACK; |
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360 | EOF |
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361 | if ($op->flags & B::OPf_MOD) { |
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362 | if ($op->private & B::OPpLVAL_INTRO) { |
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363 | $source .= " SAVECLEARSV (PAD_SVl ((PADOFFSET)$target));\n"; |
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364 | } elsif ($op->private & B::OPpDEREF) { |
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365 | my $deref = $op->private & B::OPpDEREF; |
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366 | $source .= " Perl_vivify_ref (PAD_SVl ((PADOFFSET)$target), $deref);\n"; |
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367 | } |
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368 | } |
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369 | $source .= <<EOF; |
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370 | } |
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371 | EOF |
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372 | |
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373 | out_next; |
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374 | } |
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375 | |
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376 | # pattern const+ (or general push1) |
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377 | # pattern pushmark return(?) |
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378 | # pattern pushmark gv rv2av pushmark padsv+o.ä. aassign |
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379 | |
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380 | # pattern const method_named |
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381 | sub op_method_named { |
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382 | $source .= <<EOF; |
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383 | { |
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384 | static HV *last_stash; |
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385 | static SV *last_cv; |
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386 | static U32 last_sub_generation; |
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387 | |
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388 | SV *obj = *(PL_stack_base + TOPMARK + 1); |
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389 | |
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390 | if (!SvGMAGICAL (obj) && SvROK (obj) && SvOBJECT (SvRV (obj))) |
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391 | { |
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392 | dSP; |
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393 | HV *stash = SvSTASH (SvRV (obj)); |
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394 | |
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395 | /* simple "polymorphic" inline cache */ |
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396 | if (stash == last_stash |
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397 | && PL_sub_generation == last_sub_generation) |
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398 | { |
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399 | XPUSHs (last_cv); |
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400 | PUTBACK; |
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401 | } |
|
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402 | else |
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403 | { |
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404 | PL_op = nextop; nextop = Perl_pp_method_named (aTHX); |
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405 | |
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406 | SPAGAIN; |
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407 | last_sub_generation = PL_sub_generation; |
|
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408 | last_stash = stash; |
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409 | last_cv = TOPs; |
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410 | } |
|
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411 | } |
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412 | else |
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413 | { |
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414 | /* error case usually */ |
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415 | PL_op = nextop; nextop = Perl_pp_method_named (aTHX); |
|
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416 | } |
|
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417 | } |
|
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418 | EOF |
|
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419 | |
|
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420 | out_next; |
|
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421 | } |
|
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422 | |
|
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423 | sub op_grepstart { |
|
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424 | out_callop; |
|
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425 | $op = $op->next; |
|
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426 | out_cond_jump $op->other; |
|
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427 | out_jump_next; |
|
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428 | } |
|
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429 | |
|
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430 | *op_mapstart = \&op_grepstart; |
|
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431 | |
|
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432 | sub op_substcont { |
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433 | out_callop; |
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434 | out_cond_jump $op->other->pmreplstart; |
|
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435 | assert "nextop == (OP *)${$op->other->next}L"; |
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436 | $source .= " goto op_${$op->other->next};\n"; |
|
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437 | } |
|
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438 | |
|
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439 | sub out_break_op { |
|
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440 | my ($idx) = @_; |
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441 | |
|
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442 | out_callop; |
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443 | |
|
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444 | out_cond_jump $_->[$idx] |
|
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445 | for reverse @op_loop; |
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446 | |
|
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447 | $source .= " return nextop;\n"; |
|
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448 | } |
|
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449 | |
|
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450 | sub xop_next { |
|
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451 | out_break_op 0; |
|
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452 | } |
|
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453 | |
|
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454 | sub op_last { |
|
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455 | out_break_op 1; |
|
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456 | } |
|
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457 | |
|
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458 | sub xop_redo { |
|
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459 | out_break_op 2; |
|
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460 | } |
|
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461 | |
|
|
462 | sub cv2c { |
34 | my ($cv) = @_; |
463 | my ($cv) = @_; |
35 | |
464 | |
|
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465 | local @ops; |
|
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466 | local @op_loop; |
|
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467 | local %op_regcomp; |
|
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468 | |
36 | my %opsseen; |
469 | my %opsseen; |
37 | my @ops; |
|
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38 | my @todo = $cv->START; |
470 | my @todo = $cv->START; |
39 | |
471 | |
40 | while (my $op = shift @todo) { |
472 | while (my $op = shift @todo) { |
41 | for (; $$op; $op = $op->next) { |
473 | for (; $$op; $op = $op->next) { |
42 | last if $opsseen{$$op}++; |
474 | last if $opsseen{$$op}++; |
43 | push @ops, $op; |
475 | push @ops, $op; |
|
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476 | |
44 | my $name = $op->name; |
477 | my $name = $op->name; |
|
|
478 | my $class = B::class $op; |
|
|
479 | |
45 | if (B::class($op) eq "LOGOP") { |
480 | if ($class eq "LOGOP") { |
46 | push @todo, $op->other; |
481 | unshift @todo, $op->other; # unshift vs. push saves jumps |
47 | } elsif ($name eq "subst" and ${ $op->pmreplstart }) { |
482 | |
48 | push @todo, $op->pmreplstart; |
483 | # regcomp/o patches ops at runtime, lets expect that |
49 | } elsif ($name =~ /^enter(loop|iter)$/) { |
484 | $op_regcomp{${$op->first}} = $op->next |
50 | # if ($] > 5.009) { |
485 | if $name eq "regcomp" && $op->other->pmflags & B::PMf_KEEP; |
51 | # $labels{${$op->nextop}} = "NEXT"; |
486 | |
52 | # $labels{${$op->lastop}} = "LAST"; |
487 | } elsif ($class eq "PMOP") { |
53 | # $labels{${$op->redoop}} = "REDO"; |
488 | unshift @todo, $op->pmreplstart if ${$op->pmreplstart}; |
54 | # } else { |
489 | |
55 | # $labels{$op->nextop->seq} = "NEXT"; |
490 | } elsif ($class eq "LOOP") { |
56 | # $labels{$op->lastop->seq} = "LAST"; |
491 | push @op_loop, [$op->nextop, $op->lastop->next, $op->redoop->next]; |
57 | # $labels{$op->redoop->seq} = "REDO"; |
492 | push @todo, $op->nextop, $op->lastop->next, $op->redoop->next; |
58 | # } |
|
|
59 | } |
493 | } |
60 | } |
494 | } |
61 | } |
495 | } |
62 | |
496 | |
|
|
497 | local $source = <<EOF; |
|
|
498 | OP *%%%FUNC%%% (pTHX) |
|
|
499 | { |
|
|
500 | register OP *nextop = (OP *)${$ops[0]}L; |
|
|
501 | EOF |
|
|
502 | |
63 | for (@ops) { |
503 | while (@ops) { |
64 | printf "%s\n", $_->name; |
504 | $op = shift @ops; |
|
|
505 | $op_name = $op->name; |
|
|
506 | |
|
|
507 | $source .= "op_$$op: /* $op_name */\n"; |
|
|
508 | #$source .= "fprintf (stderr, \"$$op in op $op_name\\n\");\n";#d# |
|
|
509 | #$source .= "{ dSP; sv_dump (TOPs); }\n";#d# |
|
|
510 | |
|
|
511 | $source .= " PERL_ASYNC_CHECK ();\n" |
|
|
512 | unless exists $flag{noasync}{$op_name}; |
|
|
513 | |
|
|
514 | if (my $can = __PACKAGE__->can ("op_$op_name")) { |
|
|
515 | # handcrafted replacement |
|
|
516 | $can->($op); |
|
|
517 | |
|
|
518 | } elsif (exists $flag{unsafe}{$op_name}) { |
|
|
519 | # unsafe, return to interpreter |
|
|
520 | assert "nextop == (OP *)$$op"; |
|
|
521 | $source .= " return nextop;\n"; |
|
|
522 | |
|
|
523 | } elsif ("LOGOP" eq B::class $op) { |
|
|
524 | # logical operation with optionaö branch |
|
|
525 | out_callop; |
|
|
526 | out_cond_jump $op->other; |
|
|
527 | out_jump_next; |
|
|
528 | |
|
|
529 | } elsif ("PMOP" eq B::class $op) { |
|
|
530 | # regex-thingy |
|
|
531 | out_callop; |
|
|
532 | out_cond_jump $op->pmreplroot if ${$op->pmreplroot}; |
|
|
533 | out_jump_next; |
|
|
534 | |
|
|
535 | } else { |
|
|
536 | # normal operator, linear execution |
|
|
537 | out_linear; |
|
|
538 | } |
65 | } |
539 | } |
66 | # walklines(\@lines, 0); |
540 | |
|
|
541 | $op_name = "func exit"; assert (0); |
|
|
542 | |
|
|
543 | $source .= <<EOF; |
|
|
544 | op_0: |
|
|
545 | return 0; |
|
|
546 | } |
|
|
547 | EOF |
|
|
548 | #warn $source; |
|
|
549 | |
|
|
550 | $source |
|
|
551 | } |
|
|
552 | |
|
|
553 | sub source2ptr { |
|
|
554 | my ($source) = @_; |
|
|
555 | |
|
|
556 | my $md5 = Digest::MD5::md5_hex $source; |
|
|
557 | $source =~ s/%%%FUNC%%%/Faster_$md5/; |
|
|
558 | |
|
|
559 | my $stem = "/tmp/$md5"; |
|
|
560 | |
|
|
561 | unless (-e "$stem$_so") { |
|
|
562 | open FILE, ">:raw", "$stem.c"; |
|
|
563 | print FILE <<EOF; |
|
|
564 | #define PERL_NO_GET_CONTEXT |
|
|
565 | |
|
|
566 | #include <assert.h> |
|
|
567 | |
|
|
568 | #include "EXTERN.h" |
|
|
569 | #include "perl.h" |
|
|
570 | #include "XSUB.h" |
|
|
571 | |
|
|
572 | #define RUNOPS_TILL(op) \\ |
|
|
573 | while (nextop != (op)) \\ |
|
|
574 | { \\ |
|
|
575 | PERL_ASYNC_CHECK (); \\ |
|
|
576 | PL_op = nextop; nextop = (PL_op->op_ppaddr)(aTHX); \\ |
|
|
577 | } |
|
|
578 | |
|
|
579 | EOF |
|
|
580 | print FILE $source; |
|
|
581 | close FILE; |
|
|
582 | system "$COMPILE -o $stem$_o $stem.c"; |
|
|
583 | system "$LINK -o $stem$_so $stem$_o $LIBS"; |
|
|
584 | } |
|
|
585 | |
|
|
586 | # warn $source; |
|
|
587 | my $so = DynaLoader::dl_load_file "$stem$_so" |
|
|
588 | or die "$stem$_so: $!"; |
|
|
589 | |
|
|
590 | DynaLoader::dl_find_symbol $so, "Faster_$md5" |
|
|
591 | or die "Faster_$md5: $!" |
|
|
592 | } |
|
|
593 | |
|
|
594 | sub entersub { |
|
|
595 | my ($cv) = @_; |
|
|
596 | |
|
|
597 | # always compile the whole stash |
|
|
598 | # my @stash = $cv->STASH->ARRAY; |
|
|
599 | # warn join ":", @stash; |
|
|
600 | # exit; |
|
|
601 | |
|
|
602 | eval { |
|
|
603 | my $source = cv2c $cv; |
|
|
604 | |
|
|
605 | my $ptr = source2ptr $source; |
|
|
606 | |
|
|
607 | patch_cv $cv, $ptr; |
|
|
608 | }; |
|
|
609 | |
|
|
610 | warn $@ if $@; |
67 | } |
611 | } |
68 | |
612 | |
69 | hook_entersub; |
613 | hook_entersub; |
70 | |
614 | |
71 | 1; |
615 | 1; |
72 | |
616 | |
73 | =back |
617 | =back |
|
|
618 | |
|
|
619 | =head1 BUGS/LIMITATIONS |
|
|
620 | |
|
|
621 | Perl will check much less often for asynchronous signals in |
|
|
622 | Faster-compiled code. It tries to check on every function call, loop |
|
|
623 | iteration and every I/O operator, though. |
|
|
624 | |
|
|
625 | The following things will disable Faster. If you manage to enable them at |
|
|
626 | runtime, bad things will happen. |
|
|
627 | |
|
|
628 | enabled tainting |
|
|
629 | enabled debugging |
|
|
630 | |
|
|
631 | This will dramatically reduce Faster's performance: |
|
|
632 | |
|
|
633 | threads (but you don't care about speed if you use threads anyway) |
|
|
634 | |
|
|
635 | These constructs will force the use of the interpreter as soon as they are |
|
|
636 | being executed, for the rest of the currently executed: |
|
|
637 | |
|
|
638 | .., ... (flipflop operators) |
|
|
639 | goto |
|
|
640 | next, redo (but not well-behaved last's) |
|
|
641 | eval |
|
|
642 | require |
|
|
643 | any use of formats |
74 | |
644 | |
75 | =head1 AUTHOR |
645 | =head1 AUTHOR |
76 | |
646 | |
77 | Marc Lehmann <schmorp@schmorp.de> |
647 | Marc Lehmann <schmorp@schmorp.de> |
78 | http://home.schmorp.de/ |
648 | http://home.schmorp.de/ |