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Version: 9.21.253

Navigation: Debugging > Windows

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Callstack

In this topic:

Toolbar

Stack Usage display

Columns

Setting the context of a specific call stack frame

Viewing the variables in a specific context

 

 

Introduction

The Callstack Window displays a list of functions from top to bottom called at run time from the beginning of a program until the execution of the current statement. It is mainly intended to keep track of the point to which each active subroutine should return control when it finishes executing. Call stack acts as a tool to debug an application when the function to be traced can be called in more than one context.

 

You can open the Callstack Window by clicking View | Debug | Callstack.

 

callstackwindow_zoom57

 

 

Toolbar

Icon

Description

Options-icon

Set Window Options

Opens Options dialog which allows you to configure how and if the source lines should be displayed; colors and fonts.

callstack-view-source-line-info

View Source line information

Toggles the display of source lines.

callstack-set-context

Set Context

Sets context of the chosen call stack item.

CallstackWindow - ReseedCallstackButton

Reseed Stack

Seeds the stack with the specified pattern. The pattern is used to measure the amount of stack that has been used.

 

The Reseed Stack function fills the stack with a defined pattern. Before executing your application code, the RAM associated with the stack will be filled with this pattern. As the memory assigned to the stack is used, this pattern will be overwritten with new values. By analyzing the stack, winIDEA can determine how much stack the application code has used during code execution.

 

 

Stack Usage display

The usage bar displays:

 

CallstackUsageBar

 

Maximum usage - Shaded area

Current stack pointer position - Vertical line in the bar

Numerical - Current Usage / Maximum usage / Total size

 

Warning_orange

Stack usage measurement needs to be enabled in the Stack Usage options and is displayed only when the CPU is stopped.

 

 

Columns

The Callstack pane shows the current call stack content. Function names are shown on the left, while the source line numbers at which the next function call occurred are listed on the right. Double clicking on an item will automatically set the context for that specific item. Other windows e.g. Editor, Disassembly, Locals synchronize the content, e.g. Locals display local variables of selected function context.

 

The Callstack pane is divided into:

Name column - Holds the name and the return type of the function from which the next function on the call stack was called. In case macros were used to define this function, the function name will be displayed. Optionally the source lines surrounding the function call are displayed. In case a macro function was called, macro call will be in the displayed source lines.

Source line column - Holds the information about the location (line number and the source file) of the source line.

Callstack frames - Shows the list of function calls that are currently active in the program, with the most recently called function at the top of the list. Each function call is represented by a stack frame, which contains information about the function's arguments, local variables, and return address.

 

Callstack pointers display:

Icon

Description

CallStack-GreenArrow

Active stack frame

CallStack-WhiteArrow

Execution point of a stack frame

 

Warning_orange

If you are experiencing issues with the Callstack display, check the compiler manual for any relevant compiler switches. Compilers might optimize the code to an extent that the callstack information is no longer available.

 

 

Setting the context of a specific call stack frame

You can double-click a function in the Callstack (or click Set Context button) to navigate to a function's source code or disassembled object code from the Callstack. If source code for the selected function is not available, it displays the function's object code in the Disassembly.

 

Setting the context to a specific stack frame changes the view of the program shown in the Locals and other debugger windows (i.e. displays local variables and register values for the selected function context), but does not change the next line of execution or the value stored in the program counter.

 

When a context other than the active is selected, the program execution point is indicated with a triangular indicator:

 

CallstackWindow - ProgramExecutionPoint

 

 

Viewing the variables in a specific context

When a context is set to one of the previous call stack frames, Locals changes the context as well, and shows the variables valid in this new context. The values of the variables are reconstructed (if possible).

 

 

More resources

Callstack Window in winIDEA - Video Tutorial

Troubleshooting tips and tricks in Knowledge Base

 

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