392 lines
10 KiB
Tcl
392 lines
10 KiB
Tcl
# 2007 May 10
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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#
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# $Id: fuzz_common.tcl,v 1.2 2009/01/05 19:36:30 drh Exp $
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proc fuzz {TemplateList} {
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set n [llength $TemplateList]
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set i [expr {int(rand()*$n)}]
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set r [uplevel 1 subst -novar [list [lindex $TemplateList $i]]]
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string map {"\n" " "} $r
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}
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# Fuzzy generation primitives:
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#
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# Literal
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# UnaryOp
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# BinaryOp
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# Expr
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# Table
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# Select
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# Insert
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#
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# Returns a string representing an SQL literal.
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#
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proc Literal {} {
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set TemplateList {
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456 0 -456 1 -1
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2147483648 2147483647 2147483649 -2147483647 -2147483648 -2147483649
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'The' 'first' 'experiments' 'in' 'hardware' 'fault' 'injection'
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zeroblob(1000)
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NULL
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56.1 -56.1
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123456789.1234567899
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}
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fuzz $TemplateList
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}
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# Returns a string containing an SQL unary operator (e.g. "+" or "NOT").
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#
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proc UnaryOp {} {
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set TemplateList {+ - NOT ~}
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fuzz $TemplateList
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}
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# Returns a string containing an SQL binary operator (e.g. "*" or "/").
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#
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proc BinaryOp {} {
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set TemplateList {
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|| * / % + - << >> & | < <= > >= = == != <> AND OR
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LIKE GLOB {NOT LIKE}
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}
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fuzz $TemplateList
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}
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# Return the complete text of an SQL expression.
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#
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set ::ExprDepth 0
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proc Expr { {c {}} } {
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incr ::ExprDepth
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set TemplateList [concat $c $c $c {[Literal]}]
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if {$::ExprDepth < 3} {
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lappend TemplateList \
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{[Expr $c] [BinaryOp] [Expr $c]} \
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{[UnaryOp] [Expr $c]} \
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{[Expr $c] ISNULL} \
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{[Expr $c] NOTNULL} \
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{CAST([Expr $c] AS blob)} \
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{CAST([Expr $c] AS text)} \
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{CAST([Expr $c] AS integer)} \
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{CAST([Expr $c] AS real)} \
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{abs([Expr])} \
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{coalesce([Expr], [Expr])} \
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{hex([Expr])} \
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{length([Expr])} \
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{lower([Expr])} \
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{upper([Expr])} \
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{quote([Expr])} \
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{random()} \
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{randomblob(min(max([Expr],1), 500))} \
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{typeof([Expr])} \
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{substr([Expr],[Expr],[Expr])} \
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{CASE WHEN [Expr $c] THEN [Expr $c] ELSE [Expr $c] END} \
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{[Literal]} {[Literal]} {[Literal]} \
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{[Literal]} {[Literal]} {[Literal]} \
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{[Literal]} {[Literal]} {[Literal]} \
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{[Literal]} {[Literal]} {[Literal]}
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}
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if {$::SelectDepth < 4} {
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lappend TemplateList \
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{([Select 1])} \
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{[Expr $c] IN ([Select 1])} \
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{[Expr $c] NOT IN ([Select 1])} \
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{EXISTS ([Select 1])} \
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}
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set res [fuzz $TemplateList]
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incr ::ExprDepth -1
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return $res
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}
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# Return a valid table name.
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#
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set ::TableList [list]
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proc Table {} {
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set TemplateList [concat sqlite_master $::TableList]
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fuzz $TemplateList
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}
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# Return one of:
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#
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# "SELECT DISTINCT", "SELECT ALL" or "SELECT"
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#
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proc SelectKw {} {
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set TemplateList {
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"SELECT DISTINCT"
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"SELECT ALL"
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"SELECT"
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}
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fuzz $TemplateList
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}
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# Return a result set for a SELECT statement.
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#
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proc ResultSet {{nRes 0} {c ""}} {
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if {$nRes == 0} {
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set nRes [expr {rand()*2 + 1}]
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}
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set aRes [list]
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for {set ii 0} {$ii < $nRes} {incr ii} {
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lappend aRes [Expr $c]
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}
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join $aRes ", "
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}
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set ::SelectDepth 0
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set ::ColumnList [list]
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proc SimpleSelect {{nRes 0}} {
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set TemplateList {
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{[SelectKw] [ResultSet $nRes]}
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}
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# The ::SelectDepth variable contains the number of ancestor SELECT
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# statements (i.e. for a top level SELECT it is set to 0, for a
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# sub-select 1, for a sub-select of a sub-select 2 etc.).
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#
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# If this is already greater than 3, do not generate a complicated
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# SELECT statement. This tends to cause parser stack overflow (too
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# boring to bother with).
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#
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if {$::SelectDepth < 4} {
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lappend TemplateList \
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{[SelectKw] [ResultSet $nRes $::ColumnList] FROM ([Select])} \
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{[SelectKw] [ResultSet $nRes] FROM ([Select])} \
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{[SelectKw] [ResultSet $nRes $::ColumnList] FROM [Table]} \
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{
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[SelectKw] [ResultSet $nRes $::ColumnList]
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FROM ([Select])
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GROUP BY [Expr]
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HAVING [Expr]
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} \
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if {0 == $nRes} {
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lappend TemplateList \
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{[SelectKw] * FROM ([Select])} \
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{[SelectKw] * FROM [Table]} \
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{[SelectKw] * FROM [Table] WHERE [Expr $::ColumnList]} \
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{
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[SelectKw] *
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FROM [Table],[Table] AS t2
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WHERE [Expr $::ColumnList]
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} {
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[SelectKw] *
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FROM [Table] LEFT OUTER JOIN [Table] AS t2
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ON [Expr $::ColumnList]
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WHERE [Expr $::ColumnList]
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}
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}
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}
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fuzz $TemplateList
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}
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# Return a SELECT statement.
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#
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# If boolean parameter $isExpr is set to true, make sure the
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# returned SELECT statement returns a single column of data.
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#
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proc Select {{nMulti 0}} {
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set TemplateList {
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{[SimpleSelect $nMulti]} {[SimpleSelect $nMulti]} {[SimpleSelect $nMulti]}
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{[SimpleSelect $nMulti]} {[SimpleSelect $nMulti]} {[SimpleSelect $nMulti]}
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{[SimpleSelect $nMulti]} {[SimpleSelect $nMulti]} {[SimpleSelect $nMulti]}
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{[SimpleSelect $nMulti]} {[SimpleSelect $nMulti]} {[SimpleSelect $nMulti]}
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{[SimpleSelect $nMulti] ORDER BY [Expr] DESC}
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{[SimpleSelect $nMulti] ORDER BY [Expr] ASC}
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{[SimpleSelect $nMulti] ORDER BY [Expr] ASC, [Expr] DESC}
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{[SimpleSelect $nMulti] ORDER BY [Expr] LIMIT [Expr] OFFSET [Expr]}
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}
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if {$::SelectDepth < 4} {
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if {$nMulti == 0} {
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set nMulti [expr {(rand()*2)+1}]
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}
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lappend TemplateList \
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{[SimpleSelect $nMulti] UNION [Select $nMulti]} \
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{[SimpleSelect $nMulti] UNION ALL [Select $nMulti]} \
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{[SimpleSelect $nMulti] EXCEPT [Select $nMulti]} \
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{[SimpleSelect $nMulti] INTERSECT [Select $nMulti]}
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}
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incr ::SelectDepth
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set res [fuzz $TemplateList]
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incr ::SelectDepth -1
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set res
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}
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# Generate and return a fuzzy INSERT statement.
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#
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proc Insert {} {
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set TemplateList {
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{INSERT INTO [Table] VALUES([Expr], [Expr], [Expr]);}
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{INSERT INTO [Table] VALUES([Expr], [Expr], [Expr], [Expr]);}
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{INSERT INTO [Table] VALUES([Expr], [Expr]);}
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}
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fuzz $TemplateList
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}
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proc Column {} {
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fuzz $::ColumnList
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}
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# Generate and return a fuzzy UPDATE statement.
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#
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proc Update {} {
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set TemplateList {
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{UPDATE [Table]
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SET [Column] = [Expr $::ColumnList]
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WHERE [Expr $::ColumnList]}
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}
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fuzz $TemplateList
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}
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proc Delete {} {
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set TemplateList {
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{DELETE FROM [Table] WHERE [Expr $::ColumnList]}
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}
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fuzz $TemplateList
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}
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proc Statement {} {
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set TemplateList {
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{[Update]}
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{[Insert]}
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{[Select]}
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{[Delete]}
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}
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fuzz $TemplateList
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}
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# Return an identifier. This just chooses randomly from a fixed set
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# of strings.
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proc Identifier {} {
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set TemplateList {
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This just chooses randomly a fixed
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We would also thank the developers
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for their analysis Samba
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}
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fuzz $TemplateList
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}
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proc Check {} {
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# Use a large value for $::SelectDepth, because sub-selects are
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# not allowed in expressions used by CHECK constraints.
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#
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set sd $::SelectDepth
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set ::SelectDepth 500
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set TemplateList {
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{}
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{CHECK ([Expr])}
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}
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set res [fuzz $TemplateList]
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set ::SelectDepth $sd
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set res
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}
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proc Coltype {} {
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set TemplateList {
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{INTEGER PRIMARY KEY}
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{VARCHAR [Check]}
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{PRIMARY KEY}
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}
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fuzz $TemplateList
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}
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proc DropTable {} {
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set TemplateList {
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{DROP TABLE IF EXISTS [Identifier]}
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}
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fuzz $TemplateList
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}
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proc CreateView {} {
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set TemplateList {
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{CREATE VIEW [Identifier] AS [Select]}
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}
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fuzz $TemplateList
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}
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proc DropView {} {
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set TemplateList {
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{DROP VIEW IF EXISTS [Identifier]}
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}
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fuzz $TemplateList
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}
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proc CreateTable {} {
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set TemplateList {
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{CREATE TABLE [Identifier]([Identifier] [Coltype], [Identifier] [Coltype])}
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{CREATE TEMP TABLE [Identifier]([Identifier] [Coltype])}
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}
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fuzz $TemplateList
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}
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proc CreateOrDropTableOrView {} {
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set TemplateList {
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{[CreateTable]}
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{[DropTable]}
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{[CreateView]}
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{[DropView]}
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}
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fuzz $TemplateList
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}
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########################################################################
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set ::log [open fuzzy.log w]
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#
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# Usage: do_fuzzy_test <testname> ?<options>?
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#
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# -template
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# -errorlist
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# -repeats
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#
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proc do_fuzzy_test {testname args} {
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set ::fuzzyopts(-errorlist) [list]
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set ::fuzzyopts(-repeats) $::REPEATS
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array set ::fuzzyopts $args
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lappend ::fuzzyopts(-errorlist) {parser stack overflow}
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lappend ::fuzzyopts(-errorlist) {ORDER BY}
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lappend ::fuzzyopts(-errorlist) {GROUP BY}
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lappend ::fuzzyopts(-errorlist) {datatype mismatch}
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for {set ii 0} {$ii < $::fuzzyopts(-repeats)} {incr ii} {
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do_test ${testname}.$ii {
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set ::sql [subst $::fuzzyopts(-template)]
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puts $::log $::sql
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flush $::log
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set rc [catch {execsql $::sql} msg]
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set e 1
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if {$rc} {
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set e 0
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foreach error $::fuzzyopts(-errorlist) {
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if {[string first $error $msg]>=0} {
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set e 1
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break
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}
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}
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}
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if {$e == 0} {
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puts ""
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puts $::sql
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puts $msg
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}
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set e
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} {1}
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}
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}
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