HP 68000 Series, User Manual

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(H W)
This type cast coerces an expression into a word (2 bytes). For example,
assuming the symbol int_val has the value 0x12345678,
Expression Display_Value (H W) int_val
will cause int_val to be displayed as 0x5678.
(H B)
This type cast coerces an expression into a byte. For example, assuming the
symbol int_val has a value of 0x12345678,
Expression Display_Value (H B) int_val
will cause int_val to be displayed as 0x78.
Scoping Rules
R eferences to symbols follow the standard scoping rules of C. For example, if
the symbol ’x’ is referenced, the debugger searches its symbol table for ’x’ using
the following priority:
•
A variable local to the current macro (if any).
•
A variable local to the current function (if any).
•
A variable static to the current module (if any).
•
A global variable or debugger symbol.
Referencing Symbols
Symbols are qualified (and therefore referenced) according to their context.
Context in the debugger is defined by a symbol tree and, if applicable, by a
module and function name.
Root Names
Within the debugger, the symbol table is represented as a hierarchical tree,
with each level representing a scoping level. There are two types of symbol
trees which exist within the debugger:
•
non-program symbol tree
•
program symbol tree
Chapter 10: Expressions and Symbols in Debugger Commands
Symbolic Referencing
437