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";
164 use B::Asmdata qw( %insn_data );
165 use B::Assembler qw( &assemble_fh );
166 use B::Disassembler qw( &disassemble_fh &get_header );
168 my( %opsByType, @code2name );
169 my( $lineno, $dbg, $firstbadline, @descr );
170 $dbg = 0; # debug switch
172 # $SIG{__WARN__} handler to catch Assembler error messages
177 print "error: $warnmsg\n" if $dbg;
180 # Callback for writing assembled bytes. This is where we check
181 # that we do get an error.
184 if( ++$lineno >= $firstbadline ){
185 ok( $warnmsg && $warnmsg =~ /^\d+:\s/, $descr[$lineno] );
188 my $l = syswrite( OBJ, $_[0] );
192 # Callback for writing a disassembled statement.
195 my $line = join( ' ', @_ );
198 printf "%5d %s\n", $lineno, $line if $dbg;
201 # Generate assembler instructions from a hash of operand types: each
202 # existing entry contains a list of good or bad operand values. The
203 # corresponding opcodes can be found in %opsByType.
206 my( $href, $descref, $text ) = @_;
207 for my $odt ( sort( keys( %opsByType ) ) ){
208 my $opcode = $opsByType{$odt}->[0];
211 die( "no operand list for $sel\n" ) unless exists( $href->{$sel} );
212 if( defined( $href->{$sel} ) ){
213 if( @{$href->{$sel}} ){
214 for my $od ( @{$href->{$sel}} ){
216 $descref->[$lineno] = "$text: $code2name[$opcode] $od";
217 print ASM "$code2name[$opcode] $od\n";
218 printf "%5d %s %s\n", $lineno, $code2name[$opcode], $od if $dbg;
222 $descref->[$lineno] = "$text: $code2name[$opcode]";
223 print ASM "$code2name[$opcode]\n";
224 printf "%5d %s\n", $lineno, $code2name[$opcode] if $dbg;
230 # Interesting operand values
233 comment_t => [ '"a comment"' ], # no \n
235 svindex => [ 0x7fffffff, 0 ],
236 opindex => [ 0x7fffffff, 0 ],
237 pvindex => [ 0x7fffffff, 0 ],
238 U32 => [ 0xffffffff, 0 ],
240 PV => [ '""', '"a string"', ],
241 I32 => [ -0x80000000, 0x7fffffff ],
242 IV64 => [ '0x000000000', '0x0ffffffff', '0x000000001' ], # disass formats 0x%09x
243 IV => $Config{ivsize} == 4 ?
244 [ -0x80000000, 0x7fffffff ] :
245 [ '0x000000000', '0x0ffffffff', '0x000000001' ],
246 NV => [ 1.23456789E3 ],
247 U16 => [ 0xffff, 0 ],
249 strconst => [ '""', '"another string"' ], # no NUL
250 op_tr_array => [ join( ',', 256, 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 => undef, # op_pv_tr is no longer exactly 256 shorts
278 # Determine all operand types from %Asmdata::insn_data
280 for my $opname ( keys( %insn_data ) ){
281 my ( $opcode, $put, $getname ) = @{$insn_data{$opname}};
282 push( @{$opsByType{$getname}}, $opcode );
283 $code2name[$opcode] = $opname;
287 # Write instruction(s) for correct operand values each operand type class
290 tie( *ASM, 'VirtFile' );
291 gen_type( \%goodlist, \@descr, 'round trip' );
293 # Write one instruction for each opcode.
295 for my $opcode ( 0..$#code2name ){
296 next unless defined( $code2name[$opcode] );
297 my $sel = $insn_data{$code2name[$opcode]}->[2];
299 die( "no operand list for $sel\n" ) unless exists( $goodlist{$sel} );
300 if( defined( $goodlist{$sel} ) ){
302 if( @{$goodlist{$sel}} ){
303 my $od = $goodlist{$sel}[0];
304 $descr[$lineno] = "round trip: $code2name[$opcode] $od";
305 print ASM "$code2name[$opcode] $od\n";
306 printf "%5d %s %s\n", $lineno, $code2name[$opcode], $od if $dbg;
308 $descr[$lineno] = "round trip: $code2name[$opcode]";
309 print ASM "$code2name[$opcode]\n";
310 printf "%5d %s\n", $lineno, $code2name[$opcode] if $dbg;
315 # Write instruction(s) for incorrect operand values each operand type class
317 $firstbadline = $lineno + 1;
318 gen_type( \%badlist, \@descr, 'asm error' );
320 # invalid opcode is an odd-man-out ;-)
323 $descr[$lineno] = "asm error: Gollum";
324 print ASM "Gollum\n";
325 printf "%5d %s\n", $lineno, 'Gollum' if $dbg;
329 # Now that we have defined all of our tests: plan
331 plan( tests => $lineno );
332 print "firstbadline=$firstbadline\n" if $dbg;
334 # assemble (guard against warnings and death from assembly errors)
336 $SIG{'__WARN__'} = \&catchwarn;
338 $lineno = -1; # account for the assembly header
339 tie( *OBJ, 'VirtFile' );
340 eval { assemble_fh( \*ASM, \&putobj ); };
341 print "eval: $@" if $dbg;
344 $SIG{'__WARN__'} = 'DEFAULT';
348 print "--- disassembling ---\n" if $dbg;
350 tie( *DIS, 'VirtFile' );
351 disassemble_fh( \*OBJ, \&putdis );
355 # get header (for debugging only)
358 my( $magic, $archname, $blversion, $ivsize, $ptrsize, $byteorder ) =
360 printf "Magic: 0x%08x\n", $magic;
361 print "Architecture: $archname\n";
362 print "Byteloader V: $blversion\n";
363 print "ivsize: $ivsize\n";
364 print "ptrsize: $ptrsize\n";
365 print "Byteorder: $byteorder\n";
368 # check by comparing files line by line
370 print "--- checking ---\n" if $dbg;
372 my( $asmline, $disline );
373 while( defined( $asmline = <ASM> ) ){
376 last if $lineno eq $firstbadline; # bail out where errors begin
377 ok( $asmline eq $disline, $descr[$lineno] );
378 printf "%5d %s\n", $lineno, $asmline if $dbg;