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Oracle Solaris Modular Debugger Guide
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Document Information


1.  Modular Debugger Overview

2.  Debugger Concepts

3.  MDB Language Syntax




Arithmetic Expansion

Unary Operators

Binary Operators


Shell Escapes


Symbol Name Resolution

Symbol Tables

Symbol Name Scoping

Scoping Within User-Level Applications and Shared Libraries

Object Identifier

Link Map Identifier

Scoping Within the Kernel

Kernel Debug Information

Using the Scoping Operator With a Kernel Module

Dcmd and Walker Name Resolution

Dcmd Pipelines

Formatting Dcmds

4.  Using MDB Commands Interactively

5.  Built-In Commands

6.  Execution Control

7.  Kernel Execution Control

8.  Kernel Debugging Modules

9.  Debugging With the Kernel Memory Allocator

10.  Module Programming API

A.  MDB Options

B.  Notes

C.  Transition From adb and kadb

D.  Transition From crash


Dcmd and Walker Name Resolution

As described earlier, each MDB dmod provides a set of dcmds and walkers. Dcmds and walkers are tracked in two distinct, global namespaces. MDB also keeps track of a dcmd and walker namespace associated with each dmod. Identically named dcmds or walkers within a given dmod are not allowed. A dmod with this type of naming conflict will fail to load.

Name conflicts between dcmds or walkers from different dmods are allowed in the global namespace. In the case of a conflict, the first dcmd or walker with that particular name to be loaded is given precedence in the global namespace. Alternate definitions are kept in a list in load order.

Use the backquote character (`) in a dcmd or walker name as a scoping operator to select an alternate definition. For example, if dmods m1 and m2 each provide a dcmd d, and m1 is loaded prior to m2, then you can use the scoping operator as shown below to specify the dcmd you want:


Executes m1's definition of d


Executes m1's definition of d


Executes m2's definition of d

If module m1 is unloaded, the next dcmd on the global definition list (m2`d) is promoted to global visibility. Use the ::which dcmd to determine the current definition of a dcmd or walker. Use the ::which -v dcmd to display the global definition list.