gdb/testsuite/gdb.guile/scm-value.exp

   1 # Copyright (C) 2008-2021 Free Software Foundation, Inc.
   2
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 3 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15
  16 # This file is part of the GDB testsuite.
  17 # It tests the mechanism exposing values to Guile.
  18
  19 load_lib gdb-guile.exp
  20
  21 standard_testfile
  22
  23 set has_argv0 [gdb_has_argv0]
  24
  25 # Build inferior to language specification.
  26 # LANG is one of "c" or "c++".
  27 proc build_inferior {exefile lang} {
  28     global srcdir subdir srcfile testfile hex
  29
  30     # Use different names for .o files based on the language.
  31     # For Fission, the debug info goes in foo.dwo and we don't want,
  32     # for example, a C++ compile to clobber the dwo of a C compile.
  33     # ref: http://gcc.gnu.org/wiki/DebugFission
  34     switch ${lang} {
  35         "c" { set filename ${testfile}.o }
  36         "c++" { set filename ${testfile}-cxx.o }
  37     }
  38     set objfile [standard_output_file $filename]
  39
  40     if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${objfile}" object "debug $lang"] != ""
  41          || [gdb_compile "${objfile}" "${exefile}" executable "debug $lang"] != "" } {
  42         untested "failed to compile in $lang mode"
  43         return -1
  44     }
  45     return 0
  46 }
  47
  48 proc test_value_in_inferior {} {
  49     global gdb_prompt
  50     global testfile
  51
  52     gdb_breakpoint [gdb_get_line_number "break to inspect struct and union"]
  53
  54     gdb_continue_to_breakpoint "break to inspect struct and union"
  55
  56     # Just get inferior variable s in the value history, available to guile.
  57     gdb_test "print s" "= {a = 3, b = 5}" ""
  58
  59     gdb_scm_test_silent_cmd "gu (define s (history-ref 0))" "set s"
  60
  61     gdb_test "gu (print (value-field s \"a\"))" \
  62         "= 3" "access element inside struct using string name"
  63
  64     # Append value in the value history.
  65     gdb_scm_test_silent_cmd "gu (define i (history-append! (make-value 42)))" \
  66         "append 42"
  67
  68     gdb_test "gu i" "\[0-9\]+"
  69     gdb_test "gu (history-ref i)" "#<gdb:value 42>"
  70     gdb_test "p \$" "= 42"
  71
  72     # Verify the recorded history value survives a gc.
  73     gdb_test_no_output "guile (gc)"
  74     gdb_test "p \$\$" "= 42"
  75
  76     # Make sure 'history-append!' rejects non-value objects.
  77     gdb_test "gu (history-append! 123)" \
  78         "ERROR:.* Wrong type argument.*" "history-append! type error"
  79
  80     # Test dereferencing the argv pointer.
  81
  82     # Just get inferior variable argv the value history, available to guile.
  83     gdb_test "print argv" "= \\(char \\*\\*\\) 0x.*" ""
  84
  85     gdb_scm_test_silent_cmd "gu (define argv (history-ref 0))" \
  86         "set argv"
  87     gdb_scm_test_silent_cmd "gu (define arg0 (value-dereference argv))" \
  88         "set arg0"
  89
  90     # Check that the dereferenced value is sane.
  91     global has_argv0
  92     set test "verify dereferenced value"
  93     if { $has_argv0 } {
  94         gdb_test_no_output "set print elements unlimited" ""
  95         gdb_test_no_output "set print repeats unlimited" ""
  96         gdb_test "gu (print arg0)" "0x.*$testfile\"" $test
  97     } else {
  98         unsupported $test
  99     }
 100
 101     # Smoke-test value-optimized-out?.
 102     gdb_test "gu (print (value-optimized-out? arg0))" \
 103         "= #f" "Test value-optimized-out?"
 104
 105     # Test address attribute.
 106     gdb_test "gu (print (value-address arg0))" \
 107         "= 0x\[\[:xdigit:\]\]+" "Test address attribute"
 108     # Test address attribute is #f in a non-addressable value.
 109     gdb_test "gu (print (value-address (make-value 42)))" \
 110         "= #f" "Test address attribute in non-addressable value"
 111
 112     # Test displaying a variable that is temporarily at a bad address.
 113     # But if we can examine what's at memory address 0, then we'll also be
 114     # able to display it without error.  Don't run the test in that case.
 115     set can_read_0 [is_address_zero_readable]
 116
 117     # Test memory error.
 118     set test "parse_and_eval with memory error"
 119     if {$can_read_0} {
 120         untested $test
 121     } else {
 122         gdb_test "gu (print (parse-and-eval \"*(int*)0\"))" \
 123             "ERROR: Cannot access memory at address 0x0.*" $test
 124     }
 125
 126     # Test Guile lazy value handling
 127     set test "memory error and lazy values"
 128     if {$can_read_0} {
 129         untested $test
 130     } else {
 131         gdb_test_no_output "gu (define inval (parse-and-eval \"*(int*)0\"))"
 132         gdb_test "gu (print (value-lazy? inval))" \
 133             "#t"
 134         gdb_test "gu (define inval2 (value-add inval 1))" \
 135             "ERROR: Cannot access memory at address 0x0.*" \
 136             "$test, using value in value-add"
 137         gdb_test "gu (value-fetch-lazy! inval))" \
 138             "ERROR: Cannot access memory at address 0x0.*" \
 139             "$test, using value in value-fetch-lazy!"
 140     }
 141     gdb_test_no_output "gu (define argc-lazy (parse-and-eval \"argc\"))"
 142     gdb_test_no_output "gu (define argc-notlazy (parse-and-eval \"argc\"))"
 143     gdb_test_no_output "gu (value-fetch-lazy! argc-notlazy)"
 144     gdb_test "gu (print (value-lazy? argc-lazy))" "= #t" \
 145         "argc-lazy is initially lazy"
 146     gdb_test "gu (print (value-lazy? argc-notlazy))" "= #f"
 147     gdb_test "print argc" "= 1" "sanity check argc"
 148     gdb_test "gu (print (value-lazy? argc-lazy))" "= #t" \
 149         "argc-lazy is still lazy after argc is printed"
 150     gdb_test_no_output "set argc=2"
 151     gdb_test "gu (print argc-notlazy)" "= 1"
 152     gdb_test "gu (print argc-lazy)" "= 2"
 153     gdb_test "gu (print (value-lazy? argc-lazy))" "= #f" \
 154         "argc-lazy is no longer lazy"
 155
 156     # Test string fetches, both partial and whole.
 157     gdb_test "print st" "\"divide et impera\""
 158     gdb_scm_test_silent_cmd "gu (define st (history-ref 0))" \
 159         "inf: get st value from history"
 160     gdb_test "gu (print (value->string st))" \
 161         "= divide et impera"  "Test string with no length"
 162     gdb_test "gu (print (value->string st #:length -1))" \
 163         "= divide et impera" "Test string (length = -1) is all of the string"
 164     gdb_test "gu (print (value->string st #:length 6))" \
 165         "= divide"
 166     gdb_test "gu (print (string-append \"---\" (value->string st #:length 0) \"---\"))" \
 167         "= ------" "Test string (length = 0) is empty"
 168     gdb_test "gu (print (string-length (value->string st #:length 0)))" \
 169         "= 0" "Test length is 0"
 170
 171     # Fetch a string that has embedded nulls.
 172     gdb_test "print nullst" "\"divide\\\\000et\\\\000impera\".*"
 173     gdb_scm_test_silent_cmd "gu (define nullst (history-ref 0))" \
 174         "inf: get nullst value from history"
 175     gdb_test "gu (print (value->string nullst))" \
 176         "divide" "Test string to first null"
 177     gdb_scm_test_silent_cmd "gu (set! nullst (value->string nullst #:length 9))" \
 178         "get string beyond null"
 179     gdb_test "gu (print nullst)" \
 180         "= divide\\\\000et"
 181
 182     gdb_scm_test_silent_cmd "gu (define argv-ref (value-reference-value argv))" \
 183         "test value-reference-value"
 184     gdb_test "gu (equal? argv (value-referenced-value argv-ref))" "#t"
 185     gdb_test "gu (eqv? (type-code (value-type argv-ref)) TYPE_CODE_REF)" "#t"
 186
 187     gdb_scm_test_silent_cmd "gu (define argv-rref (value-rvalue-reference-value argv))" \
 188         "test value-rvalue-reference-value"
 189     gdb_test "gu (equal? argv (value-referenced-value argv-rref))" "#t"
 190     gdb_test "gu (eqv? (type-code (value-type argv-rref)) TYPE_CODE_RVALUE_REF)" "#t"
 191
 192     gdb_test "gu (equal? (value-type (value-const-value argv)) (type-const (value-type argv)))" \
 193         "#t"
 194 }
 195
 196 proc test_strings {} {
 197     gdb_test "gu (make-value \"test\")" "#<gdb:value \"test\">" "make string"
 198
 199     # Test string conversion errors.
 200     set save_charset [get_target_charset]
 201     gdb_test_no_output "set target-charset UTF-8"
 202
 203     gdb_test_no_output "gu (set-port-conversion-strategy! #f 'error)"
 204     gdb_test "gu (print (value->string (make-value (string #\\x1234)) #:encoding \"ASCII\"))" \
 205         "ERROR.*decoding-error.*" \
 206         "value->string with default #:errors = 'error"
 207
 208     # There is no 'escape strategy for C->SCM string conversions, but it's
 209     # still a legitimate value for %default-port-conversion-strategy.
 210     # GDB handles this by, umm, substituting 'substitute.
 211     # Use this case to also handle "#:errors #f" which explicitly says
 212     # "use %default-port-conversion-strategy".
 213     gdb_test_no_output "gu (set-port-conversion-strategy! #f 'escape)"
 214     gdb_test "gu (print (value->string (make-value (string #\\x1234)) #:encoding \"ASCII\" #:errors #f))" \
 215         "= \[?\]{3}" "value->string with default #:errors = 'escape"
 216
 217     # This is last in the default conversion tests so that
 218     # %default-port-conversion-strategy ends up with the default value.
 219     gdb_test_no_output "gu (set-port-conversion-strategy! #f 'substitute)"
 220     gdb_test "gu (print (value->string (make-value (string #\\x1234)) #:encoding \"ASCII\"))" \
 221         "= \[?\]{3}" "value->string with default #:errors = 'substitute"
 222
 223     gdb_test "gu (print (value->string (make-value (string #\\x1234)) #:encoding \"ASCII\" #:errors 'error))" \
 224         "ERROR.*decoding-error.*" "value->string #:errors 'error"
 225     gdb_test "gu (print (value->string (make-value (string #\\x1234)) #:encoding \"ASCII\" #:errors 'substitute))" \
 226         "= \[?\]{3}" "value->string #:errors 'substitute"
 227     gdb_test "gu (print (value->string (make-value \"abc\") #:errors \"foo\"))" \
 228         "ERROR.*invalid error kind.*" "bad value for #:errors"
 229
 230     gdb_test_no_output "set target-charset $save_charset" \
 231         "restore target-charset"
 232 }
 233
 234 proc test_inferior_function_call {} {
 235     global gdb_prompt hex decimal
 236
 237     # Correct inferior call without arguments.
 238     gdb_test "p/x fp1" "= $hex.*"
 239     gdb_scm_test_silent_cmd "gu (define fp1 (history-ref 0))" \
 240         "get fp1 value from history"
 241     gdb_scm_test_silent_cmd "gu (set! fp1 (value-dereference fp1))" \
 242         "dereference fp1"
 243     gdb_test "gu (print (value-call fp1 '()))" \
 244         "= void"
 245
 246     # Correct inferior call with arguments.
 247     gdb_test "p/x fp2" "= $hex.*" \
 248         "place fp2 into value history, the first time"
 249     gdb_scm_test_silent_cmd "gu (define fp2 (history-ref 0))" \
 250         "get fp2 value from history"
 251     gdb_scm_test_silent_cmd "gu (set! fp2 (value-dereference fp2))" \
 252         "dereference fp2"
 253     gdb_test "gu (print (value-call fp2 (list 10 20)))" \
 254         "= 30"
 255
 256     # Incorrect to call an int value.
 257     gdb_test "p i" "= $decimal.*"
 258     gdb_scm_test_silent_cmd "gu (define i (history-ref 0))" \
 259         "inf call: get i value from history"
 260     gdb_test "gu (print (value-call i '()))" \
 261         "ERROR: .*: Wrong type argument in position 1 \\(expecting function \\(value of TYPE_CODE_FUNC\\)\\): .*"
 262
 263     # Incorrect number of arguments.
 264     gdb_test "p/x fp2" "= $hex.*" \
 265         "place fp2 into value history, the second time"
 266     gdb_scm_test_silent_cmd "gu (define fp3 (history-ref 0))" \
 267         "get fp3 value from history"
 268     gdb_scm_test_silent_cmd "gu (set! fp3 (value-dereference fp3))" \
 269         "dereference fp3"
 270     gdb_test "gu (print (value-call fp3 (list 10)))" \
 271         "ERROR: Too few arguments in function call.*"
 272 }
 273
 274 proc test_value_after_death {} {
 275     # Construct a type while the inferior is still running.
 276     gdb_scm_test_silent_cmd "gu (define ptrtype (lookup-type \"PTR\"))" \
 277         "create PTR type"
 278
 279     # Kill the inferior and remove the symbols.
 280     gdb_test "kill" "" "kill the inferior" \
 281         "Kill the program being debugged. .y or n. $" \
 282         "y"
 283     gdb_test "file" "" "discard the symbols" \
 284         "Discard symbol table from.*y or n. $" \
 285         "y"
 286
 287     # First do a garbage collect to delete anything unused.  PR 16612.
 288     gdb_scm_test_silent_cmd "gu (gc)" "garbage collect"
 289
 290     # Now create a value using that type.  Relies on arg0, created by
 291     # test_value_in_inferior.
 292     gdb_scm_test_silent_cmd "gu (define castval (value-cast arg0 (type-pointer ptrtype)))" \
 293         "cast arg0 to PTR"
 294
 295     # Make sure the type is deleted.
 296     gdb_scm_test_silent_cmd "gu (set! ptrtype #f)" \
 297         "delete PTR type"
 298
 299     # Now see if the value's type is still valid.
 300     gdb_test "gu (print (value-type castval))" \
 301         "= PTR ." "print value's type"
 302 }
 303
 304 # Regression test for invalid subscript operations.  The bug was that
 305 # the type of the value was not being checked before allowing a
 306 # subscript operation to proceed.
 307
 308 proc test_subscript_regression {exefile lang} {
 309     # Start with a fresh gdb.
 310     clean_restart ${exefile}
 311
 312     if ![gdb_guile_runto_main ] {
 313         fail "can't run to main"
 314         return
 315     }
 316
 317     if {$lang == "c++"} {
 318         gdb_breakpoint [gdb_get_line_number "break to inspect pointer by reference"]
 319         gdb_continue_to_breakpoint "break to inspect pointer by reference"
 320
 321         gdb_scm_test_silent_cmd "print rptr_int" \
 322             "Obtain address"
 323         gdb_scm_test_silent_cmd "gu (define rptr (history-ref 0))" \
 324             "set rptr"
 325         gdb_test "gu (print (value-subscript rptr 0))" \
 326             "= 2" "Check pointer passed as reference"
 327
 328         # Just the most basic test of dynamic_cast -- it is checked in
 329         # the C++ tests.
 330         gdb_test "gu (print (value->bool (value-dynamic-cast (parse-and-eval \"base\") (type-pointer (lookup-type \"Derived\")))))" \
 331             "= #t"
 332
 333         # Likewise.
 334         gdb_test "gu (print (value-dynamic-type (parse-and-eval \"base\")))" \
 335             "= Derived \[*\]"
 336         gdb_test "gu (print (value-dynamic-type (parse-and-eval \"base_ref\")))" \
 337             "= Derived \[&\]"
 338         # A static type case.
 339         gdb_test "gu (print (value-dynamic-type (parse-and-eval \"5\")))" \
 340             "= int"
 341     }
 342
 343     gdb_breakpoint [gdb_get_line_number "break to inspect struct and union"]
 344     gdb_continue_to_breakpoint "break to inspect struct and union in $lang"
 345
 346     gdb_scm_test_silent_cmd "gu (define intv (make-value 1))" \
 347         "Create int value for subscript test"
 348     gdb_scm_test_silent_cmd "gu (define stringv (make-value \"foo\"))" \
 349         "Create string value for subscript test"
 350
 351     # Try to access an int with a subscript.  This should fail.
 352     gdb_test "gu (print intv)" \
 353         "= 1" "Baseline print of an int Guile value"
 354     gdb_test "gu (print (value-subscript intv 0))" \
 355         "ERROR: Cannot subscript requested type.*" \
 356         "Attempt to access an integer with a subscript"
 357
 358     # Try to access a string with a subscript.  This should pass.
 359     gdb_test "gu (print stringv)" \
 360         "= \"foo\"" "Baseline print of a string Guile value"
 361     gdb_test "gu (print (value-subscript stringv 0))" \
 362         "= 102 'f'" "Attempt to access a string with a subscript"
 363
 364     # Try to access an int array via a pointer with a subscript.
 365     # This should pass.
 366     gdb_scm_test_silent_cmd "print p" "Build pointer to array"
 367     gdb_scm_test_silent_cmd "gu (define pointer (history-ref 0))" "set pointer"
 368     gdb_test "gu (print (value-subscript pointer 0))" \
 369         "= 1" "Access array via pointer with int subscript"
 370     gdb_test "gu (print (value-subscript pointer intv))" \
 371         "= 2" "Access array via pointer with value subscript"
 372
 373     # Try to access a single dimension array with a subscript to the
 374     # result.  This should fail.
 375     gdb_test "gu (print (value-subscript (value-subscript pointer intv) 0))" \
 376         "ERROR: Cannot subscript requested type.*" \
 377         "Attempt to access an integer with a subscript 2"
 378
 379     # Lastly, test subscript access to an array with multiple
 380     # dimensions.  This should pass.
 381     gdb_scm_test_silent_cmd "print {\"fu \",\"foo\",\"bar\"}" "Build array"
 382     gdb_scm_test_silent_cmd "gu (define marray (history-ref 0))" ""
 383     gdb_test "gu (print (value-subscript (value-subscript marray 1) 2))" \
 384         "o." "Test multiple subscript"
 385 }
 386
 387 # A few tests of gdb:parse-and-eval.
 388
 389 proc test_parse_and_eval {} {
 390     gdb_test "gu (print (parse-and-eval \"23\"))" \
 391         "= 23" "parse-and-eval constant test"
 392     gdb_test "gu (print (parse-and-eval \"5 + 7\"))" \
 393         "= 12" "parse-and-eval simple expression test"
 394     gdb_test "gu (raw-print (parse-and-eval \"5 + 7\"))" \
 395         "#<gdb:value 12>" "parse-and-eval type test"
 396 }
 397
 398 # Test that values are hashable.
 399 # N.B.: While smobs are hashable, the hash is really non-existent,
 400 # they all get hashed to the same value.  Guile may provide a hash function
 401 # for smobs in a future release.  In the meantime one should use a custom
 402 # hash table that uses gdb:hash-gsmob.
 403
 404 proc test_value_hash {} {
 405     gdb_test_multiline "Simple Guile value dictionary" \
 406         "guile" "" \
 407         "(define one (make-value 1))" "" \
 408         "(define two (make-value 2))" "" \
 409         "(define three (make-value 3))" "" \
 410         "(define vdict (make-hash-table 5))" "" \
 411         "(hash-set! vdict one \"one str\")" "" \
 412         "(hash-set! vdict two \"two str\")" "" \
 413         "(hash-set! vdict three \"three str\")" "" \
 414         "end"
 415     gdb_test "gu (print (hash-ref vdict one))" \
 416         "one str" "Test dictionary hash 1"
 417     gdb_test "gu (print (hash-ref vdict two))" \
 418         "two str" "Test dictionary hash 2"
 419     gdb_test "gu (print (hash-ref vdict three))" \
 420         "three str" "Test dictionary hash 3"
 421 }
 422
 423 # Build C version of executable.  C++ is built later.
 424 if { [build_inferior "${binfile}" "c"] < 0 } {
 425     return
 426 }
 427
 428 # Start with a fresh gdb.
 429 clean_restart ${binfile}
 430
 431 # Skip all tests if Guile scripting is not enabled.
 432 if { [skip_guile_tests] } { continue }
 433
 434 gdb_install_guile_utils
 435 gdb_install_guile_module
 436
 437 test_parse_and_eval
 438 test_value_hash
 439
 440 # The following tests require execution.
 441
 442 if ![gdb_guile_runto_main] {
 443     fail "can't run to main"
 444     return
 445 }
 446
 447 test_value_in_inferior
 448 test_inferior_function_call
 449 test_strings
 450 test_value_after_death
 451
 452 # Test either C or C++ values.
 453
 454 test_subscript_regression "${binfile}" "c"
 455
 456 if ![skip_cplus_tests] {
 457     if { [build_inferior "${binfile}-cxx" "c++"] < 0 } {
 458         return
 459     }
 460     with_test_prefix "c++" {
 461         test_subscript_regression "${binfile}-cxx" "c++"
 462     }
 463 }