# 2008 June 18

#

# 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 contains tests of the memory allocation subsystem.

#

# $Id: memsubsys2.test,v 1.2 2008/08/12 15:21:12 drh Exp $

set testdir [file dirname $argv0]

source $testdir/tester.tcl

sqlite3_reset_auto_extension

# This procedure constructs a new database in test.db.  It fills

# this database with many small records (enough to force multiple

# rebalance operations in the btree-layer and to require a large

# page cache), verifies correct results, then returns.

#

proc build_test_db {testname pragmas} {

  catch {db close}

  file delete -force test.db test.db-journal

  sqlite3 db test.db

  db eval $pragmas

  db eval {

    CREATE TABLE t1(x, y);

    CREATE TABLE t2(a, b);

    CREATE INDEX i1 ON t1(x,y);

    INSERT INTO t1 VALUES(1, 100);

    INSERT INTO t1 VALUES(2, 200);

  }

  for {set i 2} {$i<5000} {incr i $i} {

    db eval {INSERT INTO t2 SELECT * FROM t1}

    db eval {INSERT INTO t1 SELECT a+$i, a+b*100 FROM t2}

    db eval {DELETE FROM t2}

  }

  do_test $testname.1 {

    db eval {SELECT count(*) FROM t1}

  } 8192

  integrity_check $testname.2

}

# Reset all of the highwater marks.

#

proc reset_highwater_marks {} {

  sqlite3_status SQLITE_STATUS_MEMORY_USED 1

  sqlite3_status SQLITE_STATUS_MALLOC_SIZE 1

  sqlite3_status SQLITE_STATUS_PAGECACHE_USED 1

  sqlite3_status SQLITE_STATUS_PAGECACHE_OVERFLOW 1

  sqlite3_status SQLITE_STATUS_PAGECACHE_SIZE 1

  sqlite3_status SQLITE_STATUS_SCRATCH_USED 1

  sqlite3_status SQLITE_STATUS_SCRATCH_OVERFLOW 1

  sqlite3_status SQLITE_STATUS_SCRATCH_SIZE 1

  sqlite3_status SQLITE_STATUS_PARSER_STACK 1

}

# Test 1:  Verify that calling sqlite3_malloc(0) returns a NULL

# pointer.

#

set highwater [sqlite3_memory_highwater 0]

do_test memsubsys2-1.1 {

  sqlite3_malloc 0

} {0}

do_test memsubsys2-1.2 {

  sqlite3_memory_highwater 0

} $highwater

# Test 2:  Verify that the highwater mark increases after a large

# allocation.

#

sqlite3_memory_highwater 1

set highwater [sqlite3_memory_highwater 0]

do_test memsubsys2-2.1 {

  sqlite3_free [set x [sqlite3_malloc 100000]]

  expr {$x!="0"}

} {1}

do_test memsubsys2-2.2 {

  expr {[sqlite3_memory_highwater 0]>=[sqlite3_memory_used]+$highwater}

} {1}

# Test 3: Verify that turning of memstatus disables the statistics

# tracking.

#

db close

sqlite3_shutdown

sqlite3_config_memstatus 0

sqlite3_initialize

reset_highwater_marks

set highwater [sqlite3_memory_highwater 0]

do_test memsubsys2-3.1 {

  set highwater

} {0}

do_test memsubsys2-3.2 {

  sqlite3_malloc 0

} {0}

do_test memsubsys2-3.3 {

  sqlite3_memory_highwater 0

} {0}

do_test memsubsys2-3.4 {

  sqlite3_memory_used

} {0}

do_test memsubsys2-3.5 {

  set ::allocation [sqlite3_malloc 100000]

  expr {$::allocation!="0"}

} {1}

do_test memsubsys2-3.6 {

  sqlite3_memory_highwater 0

} {0}

do_test memsubsys2-3.7 {

  sqlite3_memory_used

} {0}

do_test memsubsys2-3.8 {

  sqlite3_free $::allocation

} {}

do_test memsubsys2-3.9 {

  sqlite3_free 0

} {}

# Test 4: Verify that turning on memstatus reenables the statistics

# tracking.

#

sqlite3_shutdown

sqlite3_config_memstatus 1

sqlite3_initialize

reset_highwater_marks

set highwater [sqlite3_memory_highwater 0]

do_test memsubsys2-4.1 {

  set highwater

} {0}

do_test memsubsys2-4.2 {

  sqlite3_malloc 0

} {0}

do_test memsubsys2-4.3 {

  sqlite3_memory_highwater 0

} {0}

do_test memsubsys2-4.4 {

  sqlite3_memory_used

} {0}

do_test memsubsys2-4.5 {

  set ::allocation [sqlite3_malloc 100000]

  expr {$::allocation!="0"}

} {1}

do_test memsubsys2-4.6 {

  expr {[sqlite3_memory_highwater 0]>=100000}

} {1}

do_test memsubsys2-4.7 {

  expr {[sqlite3_memory_used]>=100000}

} {1}

do_test memsubsys2-4.8 {

  sqlite3_free $::allocation

} {}

do_test memsubsys2-4.9 {

  sqlite3_free 0

} {}

do_test memsubsys2-4.10 {

  expr {[sqlite3_memory_highwater 0]>=100000}

} {1}

do_test memsubsys2-4.11 {

  sqlite3_memory_used

} {0}

autoinstall_test_functions

finish_test