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j (Execute If - Else)

The j command conditionally executes one of the specified commands, depending on the evaluation of a given expression.

j Expression Command1 ; Command2 
j Expression 'Command1' ; 'Command2' 

Parameters

Expression

The expression to evaluate. If this expression evaluates to a nonzero value, Command1 is executed. If this expression evaluates to zero, Command2 is executed. For more information about the syntax of this expression, see Numerical Expression Syntax.

Command1

The command string to be executed if the expression in Expression evaluates to a nonzero value (TRUE). You can combine multiple commands by surrounding the command string with single straight quotation marks ( ' ) and separating commands by using semicolons. If the command string is a single command, the single quotation marks are optional.

Command2

The command string to be executed if the expression in Expression evaluates to zero (FALSE). You can combine multiple commands by surrounding the command string with single straight quotation marks ( ' ) and separating commands by using semicolons. If the command string is a single command, the single quotation marks are optional.

Environment

Modes

User mode, kernel mode

Targets

Live, crash dump

Platforms

All

 

Remarks

You cannot add a semicolon or additional commands after the j command. If a semicolon appears after Command2, everything after the semicolon is ignored.

The following command displays the value of eax if MySymbol is equal to zero and displays the values of ebx and ecx otherwise.


0:000> j (MySymbol=0) 'r eax'; 'r ebx; r ecx' 

You could omit the single quotation marks around r eax, but they make the command easier to read. If you want to omit one of the commands, you can include empty quotation marks or omit the parameter for that command, as in the following commands.


0:000> j (MySymbol=0) ''; 'r ebx; r ecx' 
0:000> j (MySymbol=0)  ; 'r ebx; r ecx' 

You can also use the j command inside other commands. For example, you can use a j command to create conditional breakpoints.


0:000> bp `mysource.cpp:143` "j (poi(MyVar)>0n20) ''; 'gc' "

For more information about the syntax for conditional breakpoints, see Setting a Conditional Breakpoint.

See also

z (Execute While)

 

 

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