5 =head1 TEST FOR B::Assembler.pm AND B::Disassembler.pm
9 The general idea is to test by assembling a choice set of assembler
10 instructions, then disassemble them, and check that we've completed the
11 round trip. Also, error checking of Assembler.pm is tested by feeding
14 Since Assembler.pm likes to assemble a file, we comply by writing a
15 text file. This file contains three sections:
17 testing operand categories
19 erronous assembler instructions
21 An "operand category" is identified by the suffix of the PUT_/GET_
22 subroutines as shown in the C<%Asmdata::insn_data> initialization, e.g.
23 opcode C<ldsv> has operand category C<svindex>:
25 insn_data{ldsv} = [1, \&PUT_svindex, "GET_svindex"];
27 Because Disassembler.pm also assumes input from a file, we write the
28 resulting object code to a file. And disassembled output is written to
29 yet another text file which is then compared to the original input.
30 (Erronous assembler instructions still generate code, but this is not
31 written to the object file; therefore disassembly bails out at the first
32 instruction in error.)
34 All files are kept in memory by using TIEHASH.
39 An error where Assembler.pm and Disassembler.pm agree but Assembler.pm
40 generates invalid object code will not be detected.
42 Due to the way this test has been set up, failure of a single test
43 could cause all subsequent tests to fail as well: After an unexpected
44 assembler error no output is written, and disassembled lines will be
45 out of sync for all lines thereafter.
47 Not all possibilities for writing a valid operand value can be tested
48 because disassembly results in a uniform representation.
53 New opcodes are added automatically.
55 A new operand category will cause this program to die ("no operand list
56 for XXX"). The cure is to add suitable entries to C<%goodlist> and
57 C<%badlist>. (Since the data in Asmdata.pm is autogenerated, it may also
58 happen that the corresponding assembly or disassembly subroutine is
59 missing.) Note that an empty array as a C<%goodlist> entry means that
60 opcodes of the operand category do not take an operand (and therefore the
61 corresponding entry in C<%badlist> should have one). An C<undef> entry
62 in C<%badlist> means that any value is acceptable (and thus there is no
63 way to cause an error).
65 Set C<$dbg> to debug this test.
72 # Note: This is NOT a general purpose package. It implements
73 # sequential text and binary file i/o in a rather simple form.
76 my( $class, $data ) = @_;
77 my $obj = { data => defined( $data ) ? $data : '',
79 return bless( $obj, $class );
84 $self->{data} .= join( '', @_ );
88 my( $self, $buf, $len, $offset ) = @_;
89 unless( defined( $len ) ){
90 $len = length( $buf );
93 unless( defined( $offset ) ){
96 $self->{data} .= substr( $buf, $offset, $len );
103 return undef() if $self->{pos} >= length( $self->{data} );
104 return substr( $self->{data}, $self->{pos}++, 1 );
109 return undef() if $self->{pos} >= length( $self->{data} );
110 my $lfpos = index( $self->{data}, "\n", $self->{pos} );
112 $lfpos = length( $self->{data} );
114 my $pos = $self->{pos};
115 $self->{pos} = $lfpos + 1;
116 return substr( $self->{data}, $pos, $self->{pos} - $pos );
122 my( undef, $len, $offset ) = @_;
124 die( "offset beyond end of buffer\n" )
125 if ! defined( $$bufref ) || $offset > length( $$bufref );
130 my $remlen = length( $self->{data} ) - $self->{pos};
131 $len = $remlen if $remlen < $len;
132 return 0 unless $len;
133 substr( $$bufref, $offset, $len ) =
134 substr( $self->{data}, $self->{pos}, $len );
135 $self->{pos} += $len;
155 use Config qw(%Config);
158 if (($Config{'extensions'} !~ /\bByteLoader\b/) ){
159 print "1..0 # Skip -- Perl configured without ByteLoader module\n";
162 print "1..0\n"; exit 0;
165 use B::Asmdata qw( %insn_data );
166 use B::Assembler qw( &assemble_fh );
167 use B::Disassembler qw( &disassemble_fh &get_header );
169 my( %opsByType, @code2name );
170 my( $lineno, $dbg, $firstbadline, @descr );
171 $dbg = 0; # debug switch
173 # $SIG{__WARN__} handler to catch Assembler error messages
178 print "error: $warnmsg\n" if $dbg;
181 # Callback for writing assembled bytes. This is where we check
182 # that we do get an error.
185 if( ++$lineno >= $firstbadline ){
186 ok( $warnmsg && $warnmsg =~ /^\d+:\s/, $descr[$lineno] );
189 my $l = syswrite( OBJ, $_[0] );
193 # Callback for writing a disassembled statement.
196 my $line = join( ' ', @_ );
199 printf "%5d %s\n", $lineno, $line if $dbg;
202 # Generate assembler instructions from a hash of operand types: each
203 # existing entry contains a list of good or bad operand values. The
204 # corresponding opcodes can be found in %opsByType.
207 my( $href, $descref, $text ) = @_;
208 for my $odt ( sort( keys( %opsByType ) ) ){
209 my $opcode = $opsByType{$odt}->[0];
212 die( "no operand list for $sel\n" ) unless exists( $href->{$sel} );
213 if( defined( $href->{$sel} ) ){
214 if( @{$href->{$sel}} ){
215 for my $od ( @{$href->{$sel}} ){
217 $descref->[$lineno] = "$text: $code2name[$opcode] $od";
218 print ASM "$code2name[$opcode] $od\n";
219 printf "%5d %s %s\n", $lineno, $code2name[$opcode], $od if $dbg;
223 $descref->[$lineno] = "$text: $code2name[$opcode]";
224 print ASM "$code2name[$opcode]\n";
225 printf "%5d %s\n", $lineno, $code2name[$opcode] if $dbg;
231 # Interesting operand values
234 comment_t => [ '"a comment"' ], # no \n
236 svindex => [ 0x7fffffff, 0 ],
237 opindex => [ 0x7fffffff, 0 ],
238 pvindex => [ 0x7fffffff, 0 ],
239 U32 => [ 0xffffffff, 0 ],
241 PV => [ '""', '"a string"', ],
242 I32 => [ -0x80000000, 0x7fffffff ],
243 IV64 => [ '0x000000000', '0x0ffffffff', '0x000000001' ], # disass formats 0x%09x
244 IV => $Config{ivsize} == 4 ?
245 [ -0x80000000, 0x7fffffff ] :
246 [ '0x000000000', '0x0ffffffff', '0x000000001' ],
247 NV => [ 1.23456789E3 ],
248 U16 => [ 0xffff, 0 ],
250 strconst => [ '""', '"another string"' ], # no NUL
251 op_tr_array => [ join( ',', 0..255 ) ],
254 # Erronous operand values
257 comment_t => [ '"multi-line\ncomment"' ], # no \n
258 none => [ '"spurious arg"' ],
259 svindex => [ 0xffffffff * 2, -1 ],
260 opindex => [ 0xffffffff * 2, -2 ],
261 pvindex => [ 0xffffffff * 2, -3 ],
262 U32 => [ 0xffffffff * 2, -4 ],
263 U16 => [ 0x5ffff, -5 ],
265 PV => [ 'no quote"' ],
266 I32 => [ -0x80000001, 0x80000000 ],
267 IV64 => undef, # PUT_IV64 doesn't check - no integrity there
268 IV => $Config{ivsize} == 4 ?
269 [ -0x80000001, 0x80000000 ] : undef,
270 NV => undef, # PUT_NV accepts anything - it shouldn't, real-ly
271 pvcontents => [ '"spurious arg"' ],
272 strconst => [ 'no quote"', '"with NUL '."\0".' char"' ], # no NUL
273 op_tr_array => [ join( ',', 1..42 ) ],
277 # Determine all operand types from %Asmdata::insn_data
279 for my $opname ( keys( %insn_data ) ){
280 my ( $opcode, $put, $getname ) = @{$insn_data{$opname}};
281 push( @{$opsByType{$getname}}, $opcode );
282 $code2name[$opcode] = $opname;
286 # Write instruction(s) for correct operand values each operand type class
289 tie( *ASM, 'VirtFile' );
290 gen_type( \%goodlist, \@descr, 'round trip' );
292 # Write one instruction for each opcode.
294 for my $opcode ( 0..$#code2name ){
295 next unless defined( $code2name[$opcode] );
296 my $sel = $insn_data{$code2name[$opcode]}->[2];
298 die( "no operand list for $sel\n" ) unless exists( $goodlist{$sel} );
299 if( defined( $goodlist{$sel} ) ){
301 if( @{$goodlist{$sel}} ){
302 my $od = $goodlist{$sel}[0];
303 $descr[$lineno] = "round trip: $code2name[$opcode] $od";
304 print ASM "$code2name[$opcode] $od\n";
305 printf "%5d %s %s\n", $lineno, $code2name[$opcode], $od if $dbg;
307 $descr[$lineno] = "round trip: $code2name[$opcode]";
308 print ASM "$code2name[$opcode]\n";
309 printf "%5d %s\n", $lineno, $code2name[$opcode] if $dbg;
314 # Write instruction(s) for incorrect operand values each operand type class
316 $firstbadline = $lineno + 1;
317 gen_type( \%badlist, \@descr, 'asm error' );
319 # invalid opcode is an odd-man-out ;-)
322 $descr[$lineno] = "asm error: Gollum";
323 print ASM "Gollum\n";
324 printf "%5d %s\n", $lineno, 'Gollum' if $dbg;
328 # Now that we have defined all of our tests: plan
330 plan( tests => $lineno );
331 print "firstbadline=$firstbadline\n" if $dbg;
333 # assemble (guard against warnings and death from assembly errors)
335 $SIG{'__WARN__'} = \&catchwarn;
337 $lineno = -1; # account for the assembly header
338 tie( *OBJ, 'VirtFile' );
339 eval { assemble_fh( \*ASM, \&putobj ); };
340 print "eval: $@" if $dbg;
343 $SIG{'__WARN__'} = 'DEFAULT';
347 print "--- disassembling ---\n" if $dbg;
349 tie( *DIS, 'VirtFile' );
350 disassemble_fh( \*OBJ, \&putdis );
354 # get header (for debugging only)
357 my( $magic, $archname, $blversion, $ivsize, $ptrsize, $byteorder ) =
359 printf "Magic: 0x%08x\n", $magic;
360 print "Architecture: $archname\n";
361 print "Byteloader V: $blversion\n";
362 print "ivsize: $ivsize\n";
363 print "ptrsize: $ptrsize\n";
364 print "Byteorder: $byteorder\n";
367 # check by comparing files line by line
369 print "--- checking ---\n" if $dbg;
371 my( $asmline, $disline );
372 while( defined( $asmline = <ASM> ) ){
375 last if $lineno eq $firstbadline; # bail out where errors begin
376 ok( $asmline eq $disline, $descr[$lineno] );
377 printf "%5d %s\n", $lineno, $asmline if $dbg;