TotalView Users Guide - CI Wiki

Setting Breakpoints and Barriers
Figure 230: Action Point >
Properties: Selecting
Figure 231: Breakpoint at
Assembler Instruction
Setting Machine-Level Breakpoints
To set a machine-level breakpoint, you must first display assembler code.
(For information, see “Viewing the Assembler Version of Your Code” on page 171.)
You can now select an instruction. TotalView replaces some line numbers
with a dotted box ( )—this indicates the line is the beginning of a machine
instruction. If a line has a line number, this is the line number that appears
in the Source Pane. Since instruction sets on some platforms support variable-length
instructions, you might see a different number of lines associated
with a single line contained in the dotted box. The icon appears,
indicating that the breakpoint occurs before the instruction executes.
If you set a breakpoint on the first instruction after a source statement,
however, TotalView assumes that you are creating a source-level breakpoint,
not an assembler-level breakpoint.
358 Chapter 16: Setting Action Points