gdb/testsuite/gdb.python/py-value.exp

   1 # Copyright (C) 2008-2019 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.  It tests the mechanism
  17 # exposing values to Python.
  18
  19 load_lib gdb-python.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_creation {} {
  49   global gdb_prompt
  50   global gdb_py_is_py3k
  51
  52   gdb_py_test_silent_cmd "python i = gdb.Value (True)" "create boolean value" 1
  53   gdb_py_test_silent_cmd "python i = gdb.Value (5)" "create integer value" 1
  54   if { $gdb_py_is_py3k == 0 } {
  55     gdb_py_test_silent_cmd "python i = gdb.Value (5L)" "create long value" 1
  56   }
  57
  58   gdb_py_test_silent_cmd "python l = gdb.Value(0xffffffff12345678)" "create large unsigned 64-bit value" 1
  59   if { $gdb_py_is_py3k == 0 } {
  60     gdb_test "python print long(l)" "18446744069720004216" "large unsigned 64-bit int conversion to python"
  61   } else {
  62     gdb_test "python print (int(l))" "18446744069720004216" "large unsigned 64-bit int conversion to python"
  63   }
  64
  65   gdb_py_test_silent_cmd "python f = gdb.Value (1.25)" "create double value" 1
  66   gdb_py_test_silent_cmd "python a = gdb.Value ('string test')" "create 8-bit string value" 1
  67   gdb_test "python print (a)" "\"string test\"" "print 8-bit string"
  68   gdb_test "python print (a.__class__)" "<(type|class) 'gdb.Value'>" "verify type of 8-bit string"
  69
  70   if { $gdb_py_is_py3k == 0 } {
  71     gdb_py_test_silent_cmd "python a = gdb.Value (u'unicode test')" "create unicode value" 1
  72     gdb_test "python print (a)" "\"unicode test\"" "print Unicode string"
  73     gdb_test "python print (a.__class__)" "<(type|class) 'gdb.Value'>" "verify type of unicode string"
  74   }
  75
  76   # Test address attribute is None in a non-addressable value
  77   gdb_test "python print ('result = %s' % i.address)" "= None" "test address attribute in non-addressable value"
  78 }
  79
  80 proc test_value_numeric_ops {} {
  81   global gdb_prompt
  82   global gdb_py_is_py3k
  83
  84   gdb_py_test_silent_cmd "python i = gdb.Value (5)" "create first integer value" 0
  85   gdb_py_test_silent_cmd "python j = gdb.Value (2)" "create second integer value" 0
  86   gdb_py_test_silent_cmd "python f = gdb.Value (1.25)" "create first double value" 0
  87   gdb_py_test_silent_cmd "python g = gdb.Value (2.5)" "create second double value" 0
  88   gdb_test "python print ('result = ' + str(i+j))" " = 7" "add two integer values"
  89   gdb_test "python print ((i+j).__class__)" "<(type|class) 'gdb.Value'>" "verify type of integer add result"
  90
  91   gdb_test "python print ('result = ' + str(f+g))" " = 3.75" "add two double values"
  92   gdb_test "python print ('result = ' + str(i-j))" " = 3" "subtract two integer values"
  93   gdb_test "python print ('result = ' + str(f-g))" " = -1.25" "subtract two double values"
  94   gdb_test "python print ('result = ' + str(i*j))" " = 10" "multiply two integer values"
  95   gdb_test "python print ('result = ' + str(f*g))" " = 3.125" "multiply two double values"
  96   gdb_test "python print ('result = ' + str(i/j))" " = 2" "divide two integer values"
  97   gdb_test "python print ('result = ' + str(f/g))" " = 0.5" "divide two double values"
  98   gdb_test "python print ('result = ' + str(i%j))" " = 1" "take remainder of two integer values"
  99   # Remainder of float is implemented in Python but not in GDB's value system.
 100
 101   gdb_test "python print ('result = ' + str(i**j))" " = 25" "integer value raised to the power of another integer value"
 102   gdb_test "python print ('result = ' + str(g**j))" " = 6.25" "double value raised to the power of integer value"
 103
 104   gdb_test "python print ('result = ' + str(-i))" " = -5" "negated integer value"
 105   gdb_test "python print ('result = ' + str(+i))" " = 5" "positive integer value"
 106   gdb_test "python print ('result = ' + str(-f))" " = -1.25" "negated double value"
 107   gdb_test "python print ('result = ' + str(+f))" " = 1.25" "positive double value"
 108   gdb_test "python print ('result = ' + str(abs(j-i)))" " = 3" "absolute of integer value"
 109   gdb_test "python print ('result = ' + str(abs(f-g)))" " = 1.25" "absolute of double value"
 110
 111   # Test gdb.Value mixed with Python types.
 112
 113   gdb_test "python print ('result = ' + str(i-1))" " = 4" "subtract integer value from python integer"
 114   gdb_test "python print ((i-1).__class__)" "<(type|class) 'gdb.Value'>" "verify type of mixed integer subtraction result"
 115   gdb_test "python print ('result = ' + str(f+1.5))" " = 2.75" "add double value with python float"
 116
 117   gdb_test "python print ('result = ' + str(1-i))" " = -4" "subtract python integer from integer value"
 118   gdb_test "python print ('result = ' + str(1.5+f))" " = 2.75" "add python float with double value"
 119
 120   # Conversion test.
 121   gdb_test "print evalue" " = TWO"
 122   gdb_test_no_output "python evalue = gdb.history (0)"
 123   gdb_test "python print (int (evalue))" "2"
 124
 125   # Test pointer arithmethic
 126
 127   # First, obtain the pointers
 128   gdb_test "print (void *) 2" ".*" ""
 129   gdb_test_no_output "python a = gdb.history (0)" ""
 130   gdb_test "print (void *) 5" ".*" ""
 131   gdb_test_no_output "python b = gdb.history (0)" ""
 132
 133   gdb_test "python print(int(b))" "5" "convert pointer to int"
 134   if {!$gdb_py_is_py3k} {
 135     gdb_test "python print(long(b))" "5" "convert pointer to long"
 136   }
 137
 138   gdb_test "python print ('result = ' + str(a+5))" " = 0x7( <.*>)?" "add pointer value with python integer"
 139   gdb_test "python print ('result = ' + str(b-2))" " = 0x3( <.*>)?" "subtract python integer from pointer value"
 140   gdb_test "python print ('result = ' + str(b-a))" " = 3" "subtract two pointer values"
 141
 142   gdb_test "python print ('result = ' + 'result'\[gdb.Value(0)\])" \
 143     "result = r" "use value as string index"
 144   gdb_test "python print ('result = ' + str((1,2,3)\[gdb.Value(0)\]))" \
 145     "result = 1" "use value as tuple index"
 146   if {!$gdb_py_is_py3k} {
 147     gdb_test "python print ('result = ' + str(\[1,2,3\]\[gdb.Value(0)\]))" \
 148       "result = 1" "use value as array index"
 149   }
 150
 151   gdb_test "python print('%x' % int(gdb.parse_and_eval('-1ull')))" \
 152       "f+" "int conversion respect type sign"
 153   if {!$gdb_py_is_py3k} {
 154     gdb_test "python print('%x' % long(gdb.parse_and_eval('-1ull')))" \
 155       "f+" "long conversion respect type sign"
 156   }
 157
 158   # Test some invalid operations.
 159
 160   gdb_test_multiple "python print ('result = ' + str(i+'foo'))" "catch error in python type conversion" {
 161       -re "Argument to arithmetic operation not a number or boolean.*$gdb_prompt $"   {pass "catch error in python type conversion"}
 162       -re "result = .*$gdb_prompt $"                  {fail "catch error in python type conversion"}
 163       -re "$gdb_prompt $"                             {fail "catch error in python type conversion"}
 164   }
 165
 166   gdb_test_multiple "python print ('result = ' + str(i+gdb.Value('foo')))" "catch throw of GDB error" {
 167       -re "Traceback.*$gdb_prompt $"  {pass "catch throw of GDB error"}
 168       -re "result = .*$gdb_prompt $"  {fail "catch throw of GDB error"}
 169       -re "$gdb_prompt $"             {fail "catch throw of GDB error"}
 170   }
 171 }
 172
 173 proc test_value_boolean {} {
 174   # First, define a useful function to test booleans.
 175   gdb_py_test_multiple "define function to test booleans" \
 176     "python" "" \
 177     "def test_bool (val):" "" \
 178     "  if val:" "" \
 179     "    print ('yay')" "" \
 180     "  else:" "" \
 181     "    print ('nay')" "" \
 182     "end" ""
 183
 184   gdb_test "py test_bool (gdb.Value (True))" "yay" "check evaluation of true boolean value in expression"
 185
 186   gdb_test "py test_bool (gdb.Value (False))" "nay" "check evaluation of false boolean value in expression"
 187
 188   gdb_test "py test_bool (gdb.Value (5))" "yay" "check evaluation of true integer value in expression"
 189
 190   gdb_test "py test_bool (gdb.Value (0))" "nay" "check evaluation of false integer value in expression"
 191
 192   gdb_test "py test_bool (gdb.Value (5.2))" "yay" "check evaluation of true integer value in expression"
 193
 194   gdb_test "py test_bool (gdb.Value (0.0))" "nay" "check evaluation of false integer value in expression"
 195 }
 196
 197 proc test_value_compare {} {
 198   gdb_test "py print (gdb.Value (1) < gdb.Value (1))" "False" "less than, equal"
 199   gdb_test "py print (gdb.Value (1) < gdb.Value (2))" "True" "less than, less"
 200   gdb_test "py print (gdb.Value (2) < gdb.Value (1))" "False" "less than, greater"
 201   gdb_test "py print (gdb.Value (2) < None)" "False" "less than, None"
 202
 203   gdb_test "py print (gdb.Value (1) <= gdb.Value (1))" "True" "less or equal, equal"
 204   gdb_test "py print (gdb.Value (1) <= gdb.Value (2))" "True" "less or equal, less"
 205   gdb_test "py print (gdb.Value (2) <= gdb.Value (1))" "False" "less or equal, greater"
 206   gdb_test "py print (gdb.Value (2) <= None)" "False" "less or equal, None"
 207
 208   gdb_test "py print (gdb.Value (1) == gdb.Value (1))" "True" "equality of gdb.Values"
 209   gdb_test "py print (gdb.Value (1) == gdb.Value (2))" "False" "inequality of gdb.Values"
 210   gdb_test "py print (gdb.Value (1) == 1.0)" "True" "equality of gdb.Value with Python value"
 211   gdb_test "py print (gdb.Value (1) == 2)" "False" "inequality of gdb.Value with Python value"
 212   gdb_test "py print (gdb.Value (1) == None)" "False" "inequality of gdb.Value with None"
 213
 214   gdb_test "py print (gdb.Value (1) != gdb.Value (1))" "False" "inequality, false"
 215   gdb_test "py print (gdb.Value (1) != gdb.Value (2))" "True" "inequality, true"
 216   gdb_test "py print (gdb.Value (1) != None)" "True" "inequality, None"
 217
 218   gdb_test "py print (gdb.Value (1) > gdb.Value (1))" "False" "greater than, equal"
 219   gdb_test "py print (gdb.Value (1) > gdb.Value (2))" "False" "greater than, less"
 220   gdb_test "py print (gdb.Value (2) > gdb.Value (1))" "True" "greater than, greater"
 221   gdb_test "py print (gdb.Value (2) > None)" "True" "greater than, None"
 222
 223   gdb_test "py print (gdb.Value (1) >= gdb.Value (1))" "True" "greater or equal, equal"
 224   gdb_test "py print (gdb.Value (1) >= gdb.Value (2))" "False" "greater or equal, less"
 225   gdb_test "py print (gdb.Value (2) >= gdb.Value (1))" "True" "greater or equal, greater"
 226   gdb_test "py print (gdb.Value (2) >= None)" "True" "greater or equal, None"
 227 }
 228
 229 proc test_value_in_inferior {} {
 230   global gdb_prompt
 231   global testfile
 232   global gdb_py_is_py3k
 233
 234   gdb_breakpoint [gdb_get_line_number "break to inspect struct and union"]
 235
 236   gdb_continue_to_breakpoint "break to inspect struct and union"
 237
 238   # Just get inferior variable s in the value history, available to python.
 239   gdb_test "print s" " = {a = 3, b = 5}" ""
 240
 241   gdb_py_test_silent_cmd "python s = gdb.history (0)" "get value from history" 1
 242
 243   gdb_test "python print ('result = ' + str(s\['a'\]))" " = 3" "access element inside struct using 8-bit string name"
 244   if { $gdb_py_is_py3k == 0 } {
 245     gdb_test "python print ('result = ' + str(s\[u'a'\]))" " = 3" "access element inside struct using unicode name"
 246   }
 247
 248   # Test dereferencing the argv pointer
 249
 250   # Just get inferior variable argv the value history, available to python.
 251   gdb_test "print argv" " = \\(char \\*\\*\\) 0x.*" ""
 252
 253   gdb_py_test_silent_cmd "python argv = gdb.history (0)" "" 0
 254   gdb_py_test_silent_cmd "python arg0 = argv.dereference ()" "dereference value" 1
 255
 256   # Check that the dereferenced value is sane
 257   global has_argv0
 258   set test "verify dereferenced value"
 259   if { $has_argv0 } {
 260     gdb_test_no_output "set print elements unlimited" ""
 261     gdb_test_no_output "set print repeats unlimited" ""
 262     gdb_test "python print (arg0)" "0x.*$testfile\"" $test
 263   } else {
 264     unsupported $test
 265   }
 266
 267   # Smoke-test is_optimized_out attribute
 268   gdb_test "python print ('result = %s' % arg0.is_optimized_out)" "= False" "test is_optimized_out attribute"
 269
 270   # Test address attribute
 271   gdb_test "python print ('result = %s' % arg0.address)" "= 0x\[\[:xdigit:\]\]+" "test address attribute"
 272
 273   # Test displaying a variable that is temporarily at a bad address.
 274   # But if we can examine what's at memory address 0, then we'll also be
 275   # able to display it without error.  Don't run the test in that case.
 276   set can_read_0 [is_address_zero_readable]
 277
 278   # Test memory error.
 279   set test "parse_and_eval with memory error"
 280   if {$can_read_0} {
 281     untested $test
 282   } else {
 283     gdb_test "python print (gdb.parse_and_eval('*(int*)0'))" "gdb.MemoryError: Cannot access memory at address 0x0.*" $test
 284   }
 285
 286   # Test Python lazy value handling
 287   set test "memory error and lazy values"
 288   if {$can_read_0} {
 289     untested $test
 290   } else {
 291     gdb_test "python inval = gdb.parse_and_eval('*(int*)0')"
 292     gdb_test "python print (inval.is_lazy)" "True"
 293     gdb_test "python inval2 = inval+1" "gdb.MemoryError: Cannot access memory at address 0x0.*" $test
 294     gdb_test "python inval.fetch_lazy ()" "gdb.MemoryError: Cannot access memory at address 0x0.*" $test
 295   }
 296   set argc_value [get_integer_valueof "argc" 0]
 297   gdb_test "python argc_lazy = gdb.parse_and_eval('argc')"
 298   gdb_test "python argc_notlazy = gdb.parse_and_eval('argc')"
 299   gdb_test "python argc_notlazy.fetch_lazy()"
 300   gdb_test "python print (argc_lazy.is_lazy)" "True"
 301   gdb_test "python print (argc_notlazy.is_lazy)" "False"
 302   gdb_test "print argc" " = $argc_value" "sanity check argc"
 303   gdb_test "python print (argc_lazy.is_lazy)" "\r\nTrue"
 304   gdb_test_no_output "set argc=[expr $argc_value + 1]" "change argc"
 305   gdb_test "python print (argc_notlazy)" "\r\n$argc_value"
 306   gdb_test "python print (argc_lazy)" "\r\n[expr $argc_value + 1]"
 307   gdb_test "python print (argc_lazy.is_lazy)" "False"
 308
 309   # Test string fetches,  both partial and whole.
 310   gdb_test "print st" "\"divide et impera\""
 311   gdb_py_test_silent_cmd "python st = gdb.history (0)" "get value from history" 1
 312   gdb_test "python print (st.string ())"  "divide et impera"  "Test string with no length"
 313   gdb_test "python print (st.string (length = -1))" "divide et impera" "test string (length = -1) is all of the string"
 314   gdb_test "python print (st.string (length = 6))" "divide"
 315   gdb_test "python print (\"---\"+st.string (length = 0)+\"---\")" "------" "test string (length = 0) is empty"
 316   gdb_test "python print (len(st.string (length = 0)))" "0" "test length is 0"
 317
 318   # We choose Ada here to test a language where c_style_arrays is
 319   # false.
 320   gdb_test "set lang ada" \
 321       "Warning: the current language does not match this frame."
 322   gdb_test "python print (st.string ())"  "divide et impera"  \
 323       "Test string with no length in ada"
 324   gdb_test_no_output "set lang auto"
 325
 326   # Fetch a string that has embedded nulls.
 327   gdb_test "print nullst" "\"divide\\\\000et\\\\000impera\".*"
 328   gdb_py_test_silent_cmd "python nullst = gdb.history (0)" "get value from history" 1
 329   gdb_test "python print (nullst.string ())" "divide" "test string to first null"
 330   # Python cannot print strings that contain the null (\0) character.
 331   # For the purposes of this test, use repr()
 332   gdb_py_test_silent_cmd "python nullst = nullst.string (length = 9)" "get string beyond null" 1
 333   gdb_test "python print (repr(nullst))" "u?'divide\\\\x00et'"
 334
 335   # Test fetching a string longer than its declared (in C) size.
 336   # PR 16286
 337   gdb_py_test_silent_cmd "python xstr = gdb.parse_and_eval('xstr')" "get xstr" 1
 338   gdb_test "python print(xstr\['text'\].string (length = xstr\['length'\]))" "x{100}" \
 339     "read string beyond declared size"
 340
 341   # However it shouldn't be possible to fetch past the end of a
 342   # non-memory value.
 343   gdb_py_test_silent_cmd "python str = '\"str\"'" "set up str variable" 1
 344   gdb_test "python print (gdb.parse_and_eval (str).string (length = 10))" \
 345       "gdb.error: Attempt to take address of value not located in memory.\r\nError while executing Python code."
 346 }
 347
 348 proc test_inferior_function_call {} {
 349     global gdb_prompt hex decimal
 350
 351     # Correct inferior call without arguments.
 352     gdb_test "p/x fp1" " = $hex.*"
 353     gdb_py_test_silent_cmd "python fp1 = gdb.history (0)" "get value from history" 1
 354     gdb_test "python fp1 = fp1.dereference()" ""
 355     gdb_test "python result = fp1()" ""
 356     gdb_test "python print (result)" "void"
 357
 358     # Correct inferior call with arguments.
 359     gdb_test "p/x fp2" " = $hex.*"
 360     gdb_py_test_silent_cmd "python fp2 = gdb.history (0)" "get value from history" 1
 361     gdb_test "python fp2 = fp2.dereference()" ""
 362     gdb_test "python result2 = fp2(10,20)" ""
 363     gdb_test "python print (result2)" "30"
 364
 365     # Incorrect to call an int value.
 366     gdb_test "p i" " = $decimal.*"
 367     gdb_py_test_silent_cmd "python i = gdb.history (0)" "get value from history" 1
 368     gdb_test "python result3 = i()" ".*Value is not callable.*"
 369
 370     # Incorrect number of arguments.
 371     gdb_test "p/x fp2" " = $hex.*"
 372     gdb_py_test_silent_cmd "python fp3 = gdb.history (0)" "get value from history" 1
 373     gdb_test "python fp3 = fp3.dereference()" ""
 374     gdb_test "python result2 = fp3(10)" ".*Too few arguments in function call.*"
 375 }
 376
 377 # A few objfile tests.
 378 proc test_objfiles {} {
 379     gdb_test "python\nok=False\nfor file in gdb.objfiles():\n  if 'py-value' in file.filename:\n    ok=True\nprint (ok)\nend" "True" \
 380              "py-value in file.filename"
 381
 382     gdb_test "python print (gdb.objfiles()\[0\].pretty_printers)" "\\\[\\\]"
 383
 384     gdb_test "python gdb.objfiles()\[0\].pretty_printers = 0" \
 385       "pretty_printers attribute must be a list.*Error while executing Python code."
 386 }
 387
 388 proc test_value_after_death {} {
 389   # Construct a type while the inferior is still running.
 390   gdb_py_test_silent_cmd "python ptrtype = gdb.lookup_type('PTR')" \
 391     "create PTR type" 1
 392
 393   # Kill the inferior and remove the symbols.
 394   gdb_test "kill" "" "kill the inferior" \
 395     "Kill the program being debugged. .y or n. $" \
 396     "y"
 397   gdb_test "file" "" "discard the symbols" \
 398     "Discard symbol table from.*y or n. $" \
 399     "y"
 400
 401   # Now create a value using that type.  Relies on arg0, created by
 402   # test_value_in_inferior.
 403   gdb_py_test_silent_cmd "python castval = arg0.cast(ptrtype.pointer())" \
 404     "cast arg0 to PTR" 1
 405
 406   # Make sure the type is deleted.
 407   gdb_py_test_silent_cmd "python ptrtype = None" \
 408     "delete PTR type" 1
 409
 410   # Now see if the value's type is still valid.
 411   gdb_test "python print (castval.type)" "PTR ." \
 412     "print value's type"
 413 }
 414
 415 # Regression test for invalid subscript operations.  The bug was that
 416 # the type of the value was not being checked before allowing a
 417 # subscript operation to proceed.
 418
 419 proc test_subscript_regression {exefile lang} {
 420  # Start with a fresh gdb.
 421  clean_restart ${exefile}
 422
 423  if ![runto_main ] then {
 424      perror "couldn't run to breakpoint"
 425      return
 426  }
 427
 428  if {$lang == "c++"} {
 429      gdb_breakpoint [gdb_get_line_number "break to inspect pointer by reference"]
 430      gdb_continue_to_breakpoint "break to inspect pointer by reference"
 431
 432      gdb_py_test_silent_cmd "print rptr_int" \
 433          "Obtain address" 1
 434      gdb_py_test_silent_cmd "python rptr = gdb.history(0)" \
 435          "Obtains value from GDB" 1
 436      gdb_test "python print (rptr\[0\])" "2" "check pointer passed as reference"
 437
 438      # Just the most basic test of dynamic_cast -- it is checked in
 439      # the C++ tests.
 440      gdb_test "python print (bool(gdb.parse_and_eval('base').dynamic_cast(gdb.lookup_type('Derived').pointer())))" \
 441          True
 442
 443      # Likewise.
 444      gdb_test "python print (gdb.parse_and_eval('base').dynamic_type)" \
 445          "Derived \[*\]"
 446      gdb_test "python print (gdb.parse_and_eval('base_ref').dynamic_type)" \
 447          "Derived \[&\]"
 448      # A static type case.
 449      gdb_test "python print (gdb.parse_and_eval('5').dynamic_type)" \
 450          "int"
 451  }
 452
 453  gdb_breakpoint [gdb_get_line_number "break to inspect struct and union"]
 454  gdb_continue_to_breakpoint "break to inspect struct and union"
 455
 456  gdb_py_test_silent_cmd "python intv = gdb.Value(1)" \
 457      "Create a value for subscript test" 1
 458  gdb_py_test_silent_cmd "python stringv = gdb.Value(\"foo\")" \
 459      "Create a value for subscript test" 1
 460
 461  # Try to access an int with a subscript.  This should fail.
 462  gdb_test "python print (intv)" "1" "baseline print of an int Python value"
 463  gdb_test "python print (intv\[0\])" "gdb.error: Cannot subscript requested type.*" \
 464      "Attempt to access an integer with a subscript"
 465
 466  # Try to access a string with a subscript.  This should pass.
 467  gdb_test "python print (stringv)" "foo." "baseline print of a string Python value"
 468  gdb_test "python print (stringv\[0\])" "f." "attempt to access a string with a subscript"
 469
 470  # Try to access an int array via a pointer with a subscript.  This should pass.
 471  gdb_py_test_silent_cmd "print p" "Build pointer to array" 1
 472  gdb_py_test_silent_cmd "python pointer = gdb.history(0)" "" 1
 473  gdb_test "python print (pointer\[0\])" "1" "access array via pointer with int subscript"
 474  gdb_test "python print (pointer\[intv\])" "2" "access array via pointer with value subscript"
 475
 476  # Try to access a single dimension array with a subscript to the
 477  # result.  This should fail.
 478  gdb_test "python print (pointer\[intv\]\[0\])" "gdb.error: Cannot subscript requested type.*" \
 479      "Attempt to access an integer with a subscript"
 480
 481  # Lastly, test subscript access to an array with multiple
 482  # dimensions.  This should pass.
 483  gdb_py_test_silent_cmd "print {\"fu \",\"foo\",\"bar\"}" "Build array" 1
 484  gdb_py_test_silent_cmd "python marray = gdb.history(0)" "" 1
 485  gdb_test "python print (marray\[1\]\[2\])" "o." "test multiple subscript"
 486 }
 487
 488 # A few tests of gdb.parse_and_eval.
 489 proc test_parse_and_eval {} {
 490   gdb_test "python print (gdb.parse_and_eval ('23'))" "23" \
 491     "parse_and_eval constant test"
 492   gdb_test "python print (gdb.parse_and_eval ('5 + 7'))" "12" \
 493     "parse_and_eval simple expression test"
 494   gdb_test "python print (type(gdb.parse_and_eval ('5 + 7')))" \
 495     ".(type|class) 'gdb.Value'."\
 496     "parse_and_eval type test"
 497 }
 498
 499 # Test that values are hashable.
 500 proc test_value_hash {} {
 501   gdb_py_test_multiple "Simple Python value dictionary" \
 502     "python" "" \
 503     "one = gdb.Value(1)" "" \
 504     "two = gdb.Value(2)" "" \
 505     "three = gdb.Value(3)" "" \
 506     "vdict = {one:\"one str\",two:\"two str\",three:\"three str\"}" "" \
 507     "end"
 508     gdb_test "python print (vdict\[one\])" "one str" "test dictionary hash"
 509     gdb_test "python print (vdict\[two\])" "two str" "test dictionary hash"
 510     gdb_test "python print (vdict\[three\])" "three str" "test dictionary hash"
 511     gdb_test "python print (one.__hash__() == hash(one))" "True" "test inbuilt hash"
 512 }
 513
 514 proc test_float_conversion {} {
 515     global gdb_py_is_py3k
 516     gdb_test "python print(int(gdb.Value(0)))" "0"
 517     gdb_test "python print(int(gdb.Value(2.5)))" "2"
 518     if {!$gdb_py_is_py3k} {
 519         gdb_test "python print(long(gdb.Value(0)))" "0"
 520         gdb_test "python print(long(gdb.Value(2.5)))" "2"
 521     }
 522     gdb_test "python print(float(gdb.Value(2.5)))" "2\\.5"
 523     gdb_test "python print(float(gdb.Value(0)))" "0\\.0"
 524 }
 525
 526 proc test_value_from_buffer {} {
 527   global gdb_prompt
 528   global gdb_py_is_py3k
 529
 530   gdb_py_test_silent_cmd "python tp=gdb.lookup_type('int')" "look up int type" 0
 531   gdb_py_test_silent_cmd "python size_a=gdb.parse_and_eval('sizeof(a)')" \
 532                          "find size of a" 0
 533   gdb_py_test_silent_cmd "python size_a0=gdb.parse_and_eval('sizeof(a\[0\])')" \
 534                          "find size of element of a" 0
 535   gdb_py_test_silent_cmd "python addr=gdb.parse_and_eval('&a')" \
 536                          "find address of a" 0
 537   gdb_py_test_silent_cmd "python b=gdb.selected_inferior().read_memory(addr,size_a)" \
 538                          "read buffer from memory" 1
 539   gdb_test "python v=gdb.Value(b,tp); print(v)" "1" \
 540             "construct value from buffer"
 541   gdb_test "python v=gdb.Value(b\[size_a0:\],tp); print(v)" "2" \
 542             "convert 2nd elem of buffer to value"
 543   gdb_test "python v=gdb.Value(b\[2*size_a0:\],tp); print(v)" "3" \
 544            "convert 3rd elem of buffer to value"
 545   gdb_test "python v=gdb.Value(b\[2*size_a0+1:\],tp); print(v)" \
 546            "ValueError: Size of type is larger than that of buffer object\..*" \
 547            "attempt to convert smaller buffer than size of type"
 548   gdb_py_test_silent_cmd "python atp=tp.array(2) ; print(atp)" \
 549                          "make array type" 0
 550   gdb_py_test_silent_cmd "python va=gdb.Value(b,atp)" \
 551                          "construct array value from buffer" 0
 552   gdb_test "python print(va)" "\\{1, 2, 3\\}" "print array value"
 553   gdb_test "python print(va\[0\])" "1" "print first array element"
 554   gdb_test "python print(va\[1\])" "2" "print second array element"
 555   gdb_test "python print(va\[2\])" "3" "print third array element"
 556   gdb_test "python print(va\[3\])" "gdb\.error: no such vector element.*" \
 557            "print out of bounds array element"
 558   gdb_py_test_silent_cmd "python atpbig=tp.array(3)" "make bigger array type" 0
 559   gdb_test "python vabig=gdb.Value(b,atpbig)" \
 560            "ValueError: Size of type is larger than that of buffer object\..*" \
 561            "attempt to construct large value with small buffer"
 562   gdb_test "python v=gdb.Value(2048,tp)" \
 563            "TypeError: Object must support the python buffer protocol\..*" \
 564            "attempt to construct value from buffer with non-buffer object"
 565   gdb_test "python v=gdb.Value(b,'int'); print(v)" \
 566            "TypeError: type argument must be a gdb\.Type\..*" \
 567            "attempt to construct value with string as type"
 568 }
 569
 570 # Build C version of executable.  C++ is built later.
 571 if { [build_inferior "${binfile}" "c"] < 0 } {
 572     return -1
 573 }
 574
 575 # Start with a fresh gdb.
 576 clean_restart ${binfile}
 577
 578 # Skip all tests if Python scripting is not enabled.
 579 if { [skip_python_tests] } { continue }
 580
 581 test_value_creation
 582 test_value_numeric_ops
 583 test_value_boolean
 584 test_value_compare
 585 test_objfiles
 586 test_parse_and_eval
 587 test_value_hash
 588 test_float_conversion
 589
 590 # The following tests require execution.
 591
 592 if ![runto_main] then {
 593     fail "can't run to main"
 594     return 0
 595 }
 596
 597 test_value_in_inferior
 598 test_value_from_buffer
 599 test_inferior_function_call
 600 test_value_after_death
 601
 602 # Test either C or C++ values.
 603
 604 test_subscript_regression "${binfile}" "c"
 605
 606 if ![skip_cplus_tests] {
 607     if { [build_inferior "${binfile}-cxx" "c++"] < 0 } {
 608         return -1
 609     }
 610     with_test_prefix "c++" {
 611         test_subscript_regression "${binfile}-cxx" "c++"
 612     }
 613 }