#! /usr/bin/perl -w # This program generates C/C++ code for efficiently manipulating # ATerms. It generates functions to build and match ATerms according # to a set of constructor definitions defined in a file read from # standard input. A constructor is defined by a line with the # following format: # # SYM | ARGS | TYPE | FUN? # # where SYM is the name of the constructor, ARGS is a # whitespace-separated list of argument types, TYPE is the type of the # resulting ATerm (which should be `ATerm' or a type synonym for # `ATerm'), and the optional FUN is used to construct the names of the # build and match functions (it defaults to SYM; overriding it is # useful if there are overloaded constructors, e.g., with different # arities). Note that SYM may be empty. # # A line of the form # # VAR = EXPR # # causes a ATerm variable to be generated that is initialised to the # value EXPR. # # Finally, a line of the form # # init NAME # # causes the initialisation function to be called `NAME'. This # function must be called before any of the build/match functions or # the generated variables are used. die if scalar @ARGV != 2; my $syms = ""; my $init = ""; my $initFun = "init"; open HEADER, ">$ARGV[0]"; open IMPL, ">$ARGV[1]"; while (<STDIN>) { next if (/^\s*$/); if (/^\s*(\w*)\s*\|([^\|]*)\|\s*(\w+)\s*\|\s*(\w+)?/) { my $const = $1; my @types = split ' ', $2; my $result = $3; my $funname = $4; $funname = $const unless defined $funname; my $formals = ""; my $formals2 = ""; my $args = ""; my $unpack = ""; my $n = 1; foreach my $type (@types) { my $realType = $type; $args .= ", "; if ($type eq "string") { # $args .= "(ATerm) ATmakeAppl0(ATmakeAFun((char *) e$n, 0, ATtrue))"; # $type = "const char *"; $type = "ATerm"; $args .= "e$n"; # !!! in the matcher, we should check that the # argument is a string (i.e., a nullary application). } elsif ($type eq "int") { $args .= "(ATerm) ATmakeInt(e$n)"; } elsif ($type eq "ATermList" || $type eq "ATermBlob") { $args .= "(ATerm) e$n"; } else { $args .= "e$n"; } $formals .= ", " if $formals ne ""; $formals .= "$type e$n"; $formals2 .= ", "; $formals2 .= "$type & e$n"; my $m = $n - 1; # !!! more checks here if ($type eq "int") { $unpack .= " e$n = ATgetInt((ATermInt) ATgetArgument(e, $m));\n"; } elsif ($type eq "ATermList") { $unpack .= " e$n = (ATermList) ATgetArgument(e, $m);\n"; } elsif ($type eq "ATermBlob") { $unpack .= " e$n = (ATermBlob) ATgetArgument(e, $m);\n"; } elsif ($realType eq "string") { $unpack .= " e$n = ATgetArgument(e, $m);\n"; $unpack .= " if (ATgetType(e$n) != AT_APPL) return false;\n"; } else { $unpack .= " e$n = ATgetArgument(e, $m);\n"; } $n++; } my $arity = scalar @types; print HEADER "extern AFun sym$funname;\n\n"; print IMPL "AFun sym$funname = 0;\n"; print HEADER "static inline $result make$funname($formals) {\n"; print HEADER " return (ATerm) ATmakeAppl$arity(sym$funname$args);\n"; print HEADER "}\n\n"; print HEADER "#ifdef __cplusplus\n"; print HEADER "static inline bool match$funname(ATerm e$formals2) {\n"; print HEADER " if (ATgetType(e) != AT_APPL || ATgetAFun(e) != sym$funname) return false;\n"; print HEADER "$unpack"; print HEADER " return true;\n"; print HEADER "}\n"; print HEADER "#endif\n\n\n"; $init .= " sym$funname = ATmakeAFun(\"$const\", $arity, ATfalse);\n"; $init .= " ATprotectAFun(sym$funname);\n"; } elsif (/^\s*(\w+)\s*=\s*(.*)$/) { my $name = $1; my $value = $2; print HEADER "extern ATerm $name;\n"; print IMPL "ATerm $name = 0;\n"; $init .= " $name = $value;\n"; } elsif (/^\s*init\s+(\w+)\s*$/) { $initFun = $1; } else { die "bad line: `$_'"; } } print HEADER "void $initFun();\n\n"; print HEADER "static inline const char * aterm2String(ATerm t) {\n"; print HEADER " return (const char *) ATgetName(ATgetAFun(t));\n"; print HEADER "}\n\n"; print IMPL "\n"; print IMPL "void $initFun() {\n"; print IMPL "$init"; print IMPL "}\n"; close HEADER; close IMPL;