# 2001 September 15
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file attempts to check the library in an out-of-memory situation.
# When compiled with -DSQLITE_DEBUG=1, the SQLite library accepts a special
# command (sqlite_malloc_fail N) which causes the N-th malloc to fail.  This
# special feature is used to see what happens in the library if a malloc
# were to really fail due to an out-of-memory situation.
#
# $Id: malloc.test,v 1.31 2006/04/05 11:57:37 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Only run these tests if memory debugging is turned on.
#
if {[info command sqlite_malloc_stat]==""} {
   puts "Skipping malloc tests: not compiled with -DSQLITE_MEMDEBUG..."
   finish_test
   return
}

# Usage: do_malloc_test <test number> <options...>
#
# The first argument, <test number>, is an integer used to name the
# tests executed by this proc. Options are as follows:
#
#     -tclprep          TCL script to run to prepare test.
#     -sqlprep          SQL script to run to prepare test.
#     -tclbody          TCL script to run with malloc failure simulation.
#     -sqlbody          TCL script to run with malloc failure simulation.
#     -cleanup          TCL script to run after the test.
#
# This command runs a series of tests to verify SQLite's ability
# to handle an out-of-memory condition gracefully. It is assumed
# that if this condition occurs a malloc() call will return a
# NULL pointer. Linux, for example, doesn't do that by default. See
# the "BUGS" section of malloc(3).
#
# Each iteration of a loop, the TCL commands in any argument passed
# to the -tclbody switch, followed by the SQL commands in any argument
# passed to the -sqlbody switch are executed. Each iteration the
# Nth call to sqliteMalloc() is made to fail, where N is increased
# each time the loop runs starting from 1. When all commands execute
# successfully, the loop ends.
#
proc do_malloc_test {tn args} {
  array unset ::mallocopts 
  array set ::mallocopts $args

  set ::go 1
  for {set ::n 1} {$::go && $::n < 50000} {incr ::n} {
    do_test malloc-$tn.$::n {

      # Remove all traces of database files test.db and test2.db from the files
      # system. Then open (empty database) "test.db" with the handle [db].
      # 
      sqlite_malloc_fail 0
      catch {db close} 
      catch {file delete -force test.db}
      catch {file delete -force test.db-journal}
      catch {file delete -force test2.db}
      catch {file delete -force test2.db-journal}
      catch {sqlite3 db test.db} 
      set ::DB [sqlite3_connection_pointer db]

      # Execute any -tclprep and -sqlprep scripts.
      #
      if {[info exists ::mallocopts(-tclprep)]} {
        eval $::mallocopts(-tclprep)
      }
      if {[info exists ::mallocopts(-sqlprep)]} {
        execsql $::mallocopts(-sqlprep)
      }

      # Now set the ${::n}th malloc() to fail and execute the -tclbody and
      # -sqlbody scripts.
      #
      sqlite_malloc_fail $::n
      set ::mallocbody {}
      if {[info exists ::mallocopts(-tclbody)]} {
        append ::mallocbody "$::mallocopts(-tclbody)\n"
      }
      if {[info exists ::mallocopts(-sqlbody)]} {
        append ::mallocbody "db eval {$::mallocopts(-sqlbody)}"
      }
      set v [catch $::mallocbody msg]

      set leftover [lindex [sqlite_malloc_stat] 2]
      if {$leftover>0} {
        if {$leftover>1} {puts "\nLeftover: $leftover\nReturn=$v  Message=$msg"}
        set ::go 0
        if {$v} {
          puts "\nError message returned: $msg"
        } else {
          set v {1 1}
        }
      } else {
        set v2 [expr {$msg=="" || $msg=="out of memory"}]
        if {!$v2} {puts "\nError message returned: $msg"}
        lappend v $v2
      }
    } {1 1}

    if {[info exists ::mallocopts(-cleanup)]} {
      catch [list uplevel #0 $::mallocopts(-cleanup)] msg
    }
  }
  unset ::mallocopts
}

do_malloc_test 1 -tclprep {
  db close
} -tclbody {
  if {[catch {sqlite3 db test.db}]} {
    error "out of memory"
  }
} -sqlbody {
  CREATE TABLE t1(
     a int, b float, c double, d text, e varchar(20),
     primary key(a,b,c)
  );
  CREATE INDEX i1 ON t1(a,b);
  INSERT INTO t1 VALUES(1,2.3,4.5,'hi','there');
  INSERT INTO t1 VALUES(6,7.0,0.8,'hello','out yonder');
  SELECT * FROM t1;
  SELECT avg(b) FROM t1 GROUP BY a HAVING b>20.0;
  DELETE FROM t1 WHERE a IN (SELECT min(a) FROM t1);
  SELECT count(*) FROM t1;
} 

# Ensure that no file descriptors were leaked.
do_test malloc-1.X {
  catch {db close}
  set sqlite_open_file_count
} {0}

do_malloc_test 2 -sqlbody {
  CREATE TABLE t1(a int, b int default 'abc', c int default 1);
  CREATE INDEX i1 ON t1(a,b);
  INSERT INTO t1 VALUES(1,1,'99 abcdefghijklmnopqrstuvwxyz');
  INSERT INTO t1 VALUES(2,4,'98 abcdefghijklmnopqrstuvwxyz');
  INSERT INTO t1 VALUES(3,9,'97 abcdefghijklmnopqrstuvwxyz');
  INSERT INTO t1 VALUES(4,16,'96 abcdefghijklmnopqrstuvwxyz');
  INSERT INTO t1 VALUES(5,25,'95 abcdefghijklmnopqrstuvwxyz');
  INSERT INTO t1 VALUES(6,36,'94 abcdefghijklmnopqrstuvwxyz');
  SELECT 'stuff', count(*) as 'other stuff', max(a+10) FROM t1;
  UPDATE t1 SET b=b||b||b||b;
  UPDATE t1 SET b=a WHERE a in (10,12,22);
  INSERT INTO t1(c,b,a) VALUES(20,10,5);
  INSERT INTO t1 SELECT * FROM t1
      WHERE a IN (SELECT a FROM t1 WHERE a<10);
  DELETE FROM t1 WHERE a>=10;
  DROP INDEX i1;
  DELETE FROM t1;
} 

# Ensure that no file descriptors were leaked.
do_test malloc-2.X {
  catch {db close}
  set sqlite_open_file_count
} {0}

do_malloc_test 3 -sqlbody {
  BEGIN TRANSACTION;
  CREATE TABLE t1(a int, b int, c int);
  CREATE INDEX i1 ON t1(a,b);
  INSERT INTO t1 VALUES(1,1,99);
  INSERT INTO t1 VALUES(2,4,98);
  INSERT INTO t1 VALUES(3,9,97);
  INSERT INTO t1 VALUES(4,16,96);
  INSERT INTO t1 VALUES(5,25,95);
  INSERT INTO t1 VALUES(6,36,94);
  INSERT INTO t1(c,b,a) VALUES(20,10,5);
  DELETE FROM t1 WHERE a>=10;
  DROP INDEX i1;
  DELETE FROM t1;
  ROLLBACK;
} 


# Ensure that no file descriptors were leaked.
do_test malloc-3.X {
  catch {db close}
  set sqlite_open_file_count
} {0}

do_malloc_test 4 -sqlbody {
  BEGIN TRANSACTION;
  CREATE TABLE t1(a int, b int, c int);
  CREATE INDEX i1 ON t1(a,b);
  INSERT INTO t1 VALUES(1,1,99);
  INSERT INTO t1 VALUES(2,4,98);
  INSERT INTO t1 VALUES(3,9,97);
  INSERT INTO t1 VALUES(4,16,96);
  INSERT INTO t1 VALUES(5,25,95);
  INSERT INTO t1 VALUES(6,36,94);
  UPDATE t1 SET b=a WHERE a in (10,12,22);
  INSERT INTO t1 SELECT * FROM t1
     WHERE a IN (SELECT a FROM t1 WHERE a<10);
  DROP INDEX i1;
  DELETE FROM t1;
  COMMIT;
} 

# Ensure that no file descriptors were leaked.
do_test malloc-4.X {
  catch {db close}
  set sqlite_open_file_count
} {0}

do_malloc_test 5 -sqlbody {
  BEGIN TRANSACTION;
  CREATE TABLE t1(a,b);
  CREATE TABLE t2(x,y);
  CREATE TRIGGER r1 AFTER INSERT ON t1 BEGIN
  INSERT INTO t2(x,y) VALUES(new.rowid,1);
  END;
  INSERT INTO t1(a,b) VALUES(2,3);
  COMMIT;
} 

# Ensure that no file descriptors were leaked.
do_test malloc-5.X {
  catch {db close}
  set sqlite_open_file_count
} {0}

do_malloc_test 6 -sqlprep {
  BEGIN TRANSACTION;
  CREATE TABLE t1(a);
  INSERT INTO t1 VALUES(1);
  INSERT INTO t1 SELECT a*2 FROM t1;
  INSERT INTO t1 SELECT a*2 FROM t1;
  INSERT INTO t1 SELECT a*2 FROM t1;
  INSERT INTO t1 SELECT a*2 FROM t1;
  INSERT INTO t1 SELECT a*2 FROM t1;
  INSERT INTO t1 SELECT a*2 FROM t1;
  INSERT INTO t1 SELECT a*2 FROM t1;
  INSERT INTO t1 SELECT a*2 FROM t1;
  INSERT INTO t1 SELECT a*2 FROM t1;
  INSERT INTO t1 SELECT a*2 FROM t1;
  DELETE FROM t1 where rowid%5 = 0;
  COMMIT;
} -sqlbody {
  VACUUM;
} 

do_malloc_test 7 -sqlprep {
  CREATE TABLE t1(a, b);
  INSERT INTO t1 VALUES(1, 2);
  INSERT INTO t1 VALUES(3, 4);
  INSERT INTO t1 VALUES(5, 6);
  INSERT INTO t1 VALUES(7, randstr(1200,1200));
} -sqlbody {
  SELECT min(a) FROM t1 WHERE a<6 GROUP BY b;
  SELECT a FROM t1 WHERE a<6 ORDER BY a;
  SELECT b FROM t1 WHERE a>6;
} 

# This block is designed to test that some malloc failures that may
# occur in vdbeapi.c. Specifically, if a malloc failure that occurs
# when converting UTF-16 text to integers and real numbers is handled
# correctly. 
#
# This is done by retrieving a string from the database engine and
# manipulating it using the sqlite3_column_*** APIs. This doesn't 
# actually return an error to the user when a malloc() fails.. That 
# could be viewed as a bug.
#
# These tests only run if UTF-16 support is compiled in.
#
if {$::sqlite_options(utf16)} {
  do_malloc_test 8 -tclprep {
    set sql "SELECT '[string repeat abc 20]', '[string repeat def 20]', ?"
    set ::STMT [sqlite3_prepare $::DB $sql -1 X]
    sqlite3_step $::STMT
    if { $::tcl_platform(byteOrder)=="littleEndian" } {
      set ::bomstr "\xFF\xFE"
    } else {
      set ::bomstr "\xFE\xFF"
    }
    append ::bomstr [encoding convertto unicode "123456789_123456789_12345678"]
  } -tclbody {
    sqlite3_column_text16 $::STMT 0
    sqlite3_column_int $::STMT 0
    sqlite3_column_text16 $::STMT 1
    sqlite3_column_double $::STMT 1
    sqlite3_reset $::STMT
    sqlite3_bind_text16 $::STMT 1 $::bomstr 60
    catch {sqlite3_finalize $::STMT}
    if {[lindex [sqlite_malloc_stat] 2]<=0} {
      error "out of memory"
    }
  } -cleanup {
    sqlite3_finalize $::STMT
  }
}

# This block tests that malloc() failures that occur whilst commiting
# a multi-file transaction are handled correctly.
#
do_malloc_test 9 -sqlprep {
  ATTACH 'test2.db' as test2;
  CREATE TABLE abc1(a, b, c);
  CREATE TABLE test2.abc2(a, b, c);
} -sqlbody {
  BEGIN;
  INSERT INTO abc1 VALUES(1, 2, 3);
  INSERT INTO abc2 VALUES(1, 2, 3);
  COMMIT;
}

# This block tests malloc() failures that occur while opening a 
# connection to a database.
do_malloc_test 10 -sqlprep {
  CREATE TABLE abc(a, b, c);
} -tclbody {
  sqlite3 db2 test.db
  db2 eval {SELECT * FROM sqlite_master}
  db2 close
} 

# This block tests malloc() failures that occur within calls to
# sqlite3_create_function().
do_malloc_test 11  -tclbody {
  set rc [sqlite3_create_function $::DB]
  if {[string match $rc SQLITE_NOMEM]} {
    error "out of memory"
  }
}

do_malloc_test 12 -tclbody {
  set sql16 [encoding convertto unicode "SELECT * FROM sqlite_master"]
  append sql16 "\00\00"
  set ::STMT [sqlite3_prepare16 $::DB $sql16 -1 DUMMY]
  sqlite3_finalize $::STMT
} 

# Test malloc errors when replaying two hot journals from a 2-file 
# transaction.
ifcapable crashtest {
  do_malloc_test 13 -tclprep {
    set rc [crashsql 1 test2.db {
      ATTACH 'test2.db' as aux;
      PRAGMA cache_size = 10;
      BEGIN;
      CREATE TABLE aux.t2(a, b, c);
      CREATE TABLE t1(a, b, c);
      COMMIT;
    }]
    if {$rc!="1 {child process exited abnormally}"} {
      error "Wrong error message: $rc"
    }
  } -tclbody {
    db eval {ATTACH 'test2.db' as aux;}
    set rc [catch {db eval {
      SELECT * FROM t1; 
      SELECT * FROM t2;
    }} err]
    if {$rc && $err!="no such table: t1"} {
      error $err
    }
  }
}

if {$tcl_platform(platform)!="windows"} {
  do_malloc_test 14 -tclprep {
    catch {db close}
    sqlite3 db2 test2.db
    db2 eval {
      PRAGMA synchronous = 0;
      CREATE TABLE t1(a, b);
      INSERT INTO t1 VALUES(1, 2);
      BEGIN;
      INSERT INTO t1 VALUES(3, 4);
    }
    copy_file test2.db test.db
    copy_file test2.db-journal test.db-journal
    db2 close
  } -tclbody {
    sqlite3 db test.db
    db eval {
      SELECT * FROM t1;
    }  
  }
}

proc string_compare {a b} {
  return [string compare $a $b]
}

# Test for malloc() failures in sqlite3_create_collation() and 
# sqlite3_create_collation16().
#
do_malloc_test 15 -tclbody {
  db collate string_compare string_compare
  if {[catch {add_test_collate $::DB 1 1 1} msg]} {
    if {$msg=="SQLITE_NOMEM"} {set msg "out of memory"}
    error $msg
  }

  db complete {SELECT "hello """||'world"' [microsoft], * FROM anicetable;}
  db complete {-- Useful comment}

  execsql {
    CREATE TABLE t1(a, b COLLATE string_compare);
    INSERT INTO t1 VALUES(10, 'string');
    INSERT INTO t1 VALUES(10, 'string2');
  }
}

# Also test sqlite3_complete(). There are (currently) no malloc()
# calls in this function, but test anyway against future changes.
#
do_malloc_test 16 -tclbody {
  db complete {SELECT "hello """||'world"' [microsoft], * FROM anicetable;}
  db complete {-- Useful comment}
  db eval {
    SELECT * FROM sqlite_master;
  }
}

# Test handling of malloc() failures in sqlite3_open16().
#
do_malloc_test 17 -tclbody {
  set DB2 0
  set STMT 0

  # open database using sqlite3_open16()
  set DB2 [sqlite3_open16 test.db -unused]
  if {0==$DB2} {
    error "out of memory"
  }

  # Prepare statement
  set rc [catch {sqlite3_prepare $DB2 {SELECT * FROM sqlite_master} -1 X} msg]
  if {$rc} {
    error [string range $msg 4 end]
  }
  set STMT $msg

  # Finalize statement
  set rc [sqlite3_finalize $STMT]
  if {$rc!="SQLITE_OK"} {
    error [sqlite3_errmsg $DB2]
  }
  set STMT 0

  # Close database
  set rc [sqlite3_close $DB2]
  if {$rc!="SQLITE_OK"} {
    error [sqlite3_errmsg $DB2]
  }
  set DB2 0
} -cleanup {
  if {$STMT!="0"} {
    sqlite3_finalize $STMT
  }
  if {$DB2!="0"} {
    set rc [sqlite3_close $DB2]
  }
}

# Test handling of malloc() failures in sqlite3_errmsg16().
#
do_malloc_test 18 -tclbody {
  catch {
    db eval "SELECT [string repeat longcolumnname 10] FROM sqlite_master"
  } msg
  if {$msg=="out of memory"} {error $msg}
  set utf16 [sqlite3_errmsg16 [sqlite3_connection_pointer db]]
  binary scan $utf16 c* bytes
  if {[llength $bytes]==0} {
    error "out of memory"
  }
}

# This test is aimed at coverage testing. Specificly, it is supposed to
# cause a malloc() only used when converting between the two utf-16 
# encodings to fail (i.e. little-endian->big-endian). It only actually 
# hits this malloc() on little-endian hosts.
#
set static_string "\x00h\x00e\x00l\x00l\x00o"
for {set l 0} {$l<10} {incr l} {
  append static_string $static_string
}
append static_string "\x00\x00"
do_malloc_test 19 -tclprep {
  execsql {
    PRAGMA encoding = "UTF16be";
    CREATE TABLE abc(a, b, c);
  }
} -tclbody {
  unset -nocomplain ::STMT
  set r [catch {
    set ::STMT [sqlite3_prepare $::DB {SELECT ?} -1 DUMMY]
    sqlite3_bind_text16 -static $::STMT 1 $static_string 112
  } msg]
  if {$r} {error [string range $msg 4 end]}
  set msg
} -cleanup {
  if {[info exists ::STMT]} {
    sqlite3_finalize $::STMT
  }
}
unset static_string

# Make sure SQLITE_NOMEM is reported out on an ATTACH failure even
# when the malloc failure occurs within the nested parse.
#
do_malloc_test 20 -tclprep {
  db close
  file delete -force test2.db test2.db-journal
  sqlite3 db test2.db
  db eval {CREATE TABLE t1(x);}
  db close
} -tclbody {
  if {[catch {sqlite3 db test.db}]} {
    error "out of memory"
  }
} -sqlbody {
  ATTACH DATABASE 'test2.db' AS t2;
  SELECT * FROM t1;
  DETACH DATABASE t2;
} 


# Ensure that no file descriptors were leaked.
do_test malloc-99.X {
  catch {db close}
  set sqlite_open_file_count
} {0}

sqlite_malloc_fail 0
finish_test
