8000 sqlcipher/mkopcodeh.awk at master · orakle/sqlcipher · GitHub
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","#","# The lines of the vdbe.c that we are interested in are of the form:","#","# case OP_aaaa: /* same as TK_bbbbb */","#","# The TK_ comment is optional. If it is present, then the value assigned to","# the OP_ is the same as the TK_ value. If missing, the OP_ value is assigned","# a small integer that is different from every other OP_ value.","#","# We go to the trouble of making some OP_ values the same as TK_ values","# as an optimization. During parsing, things like expression operators","# are coded with TK_ values such as TK_ADD, TK_DIVIDE, and so forth. Later","# during code generation, we need to generate corresponding opcodes like","# OP_Add and OP_Divide. By making TK_ADD==OP_Add and TK_DIVIDE==OP_Divide,","# code to translate from one to the other is avoided. This makes the","# code generator run (infinitesimally) faster and more importantly it makes","# the library footprint smaller.","#","# This script also scans for lines of the form:","#","# case OP_aaaa: /* jump, in1, in2, in3, out2-prerelease, out3 */","#","# When such comments are found on an opcode, it means that certain","# properties apply to that opcode. Set corresponding flags using the","# OPFLG_INITIALIZER macro.","#","","","# Remember the TK_ values from the parse.h file","/^#define TK_/ {"," tk[$2] = 0+$3","}","","# Scan for \"case OP_aaaa:\" lines in the vdbe.c file","/^case OP_/ {"," name = $2"," sub(/:/,\"\",name)"," sub(\"\\r\",\"\",name)"," op[name] = -1"," jump[name] = 0"," out2_prerelease[name] = 0"," in1[name] = 0"," in2[name] = 0"," in3[name] = 0"," out2[name] = 0"," out3[name] = 0"," for(i=3; i\u003cNF; i++){"," if($i==\"same\" \u0026\u0026 $(i+1)==\"as\"){"," sym = $(i+2)"," sub(/,/,\"\",sym)"," op[name] = tk[sym]"," used[op[name]] = 1"," sameas[op[name]] = sym"," }"," x = $i"," sub(\",\",\"\",x)"," if(x==\"jump\"){"," jump[name] = 1"," }else if(x==\"out2-prerelease\"){"," out2_prerelease[name] = 1"," }else if(x==\"in1\"){"," in1[name] = 1"," }else if(x==\"in2\"){"," in2[name] = 1"," }else if(x==\"in3\"){"," in3[name] = 1"," }else if(x==\"out2\"){"," out2[name] = 1"," }else if(x==\"out3\"){"," out3[name] = 1"," }"," }"," order[n_op++] = name;","}","","# Assign numbers to all opcodes and output the result.","END {"," cnt = 0"," max = 0"," print \"/* Automatically generated. Do not edit */\""," print \"/* See the mkopcodeh.awk script for details */\""," op[\"OP_Noop\"] = -1;"," order[n_op++] = \"OP_Noop\";"," op[\"OP_Explain\"] = -1;"," order[n_op++] = \"OP_Explain\";"," for(i=0; i\u003cn_op; i++){"," name = order[i];"," if( op[name]\u003c0 ){"," cnt++"," while( used[cnt] ) cnt++"," op[name] = cnt"," }"," used[op[name]] = 1;"," if( op[name]\u003emax ) max = op[name]"," printf \"#define %-25s %15d\", name, op[name]"," if( sameas[op[name]] ) {"," printf \" /* same as %-12s*/\", sameas[op[name]]"," } "," printf \"\\n\"",""," }"," seenUnused = 0;"," for(i=1; i\u003cmax; i++){"," if( !used[i] ){"," if( !seenUnused ){"," printf \"\\n/* The following opcode values are never used */\\n\""," seenUnused = 1"," }"," printf \"#define %-25s %15d\\n\", sprintf( \"OP_NotUsed_%-3d\", i ), i"," }"," }",""," # Generate the bitvectors:"," #"," # bit 0: jump"," # bit 1: pushes a result onto stack"," # bit 2: output to p1. release p1 before opcode runs"," #"," for(i=0; i\u003c=max; i++) bv[i] = 0;"," for(i=0; i\u003cn_op; i++){"," name = order[i];"," x = op[name]"," a0 = a1 = a2 = a3 = a4 = a5 = a6 = a7 = 0"," # a7 = a9 = a10 = a11 = a12 = a13 = a14 = a15 = 0"," if( jump[name] ) a0 = 1;"," if( out2_prerelease[name] ) a1 = 2;"," if( in1[name] ) a2 = 4;"," if( in2[name] ) a3 = 8;"," if( in3[name] ) a4 = 16;"," if( out2[name] ) a5 = 32;"," if( out3[name] ) a6 = 64;"," # bv[x] = a0+a1+a2+a3+a4+a5+a6+a7+a8+a9+a10+a11+a12+a13+a14+a15;"," bv[x] = a0+a1+a2+a3+a4+a5+a6+a7;"," }"," print \"\\n\""," print \"/* Properties such as \\\"out2\\\" or \\\"jump\\\" that are specified in\""," print \"** comments following the \\\"case\\\" for each opcode in the vdbe.c\""," print \"** are encoded into bitvectors as follows:\""," print \"*/\""," print \"#define OPFLG_JUMP 0x0001 /* jump: P2 holds jmp target */\""," print \"#define OPFLG_OUT2_PRERELEASE 0x0002 /* out2-prerelease: */\""," print \"#define OPFLG_IN1 0x0004 /* in1: P1 is an input */\""," print \"#define OPFLG_IN2 0x0008 /* in2: P2 is an input */\""," print \"#define OPFLG_IN3 0x0010 /* in3: P3 is an input */\""," print \"#define OPFLG_OUT2 0x0020 /* out2: P2 is an output */\""," print \"#define OPFLG_OUT3 0x0040 /* out3: P3 is an output */\""," print \"#define OPFLG_INITIALIZER {\\\\\""," for(i=0; 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