Manually expand the macro to its corresponding source code.This section describes programming practices that make debugging with CodeView easier and more efficient.
CodeView treats each source-code line as a unit. For this reason, you cannot trace and set a breakpoint on more than one statement per line. You can change from Source display mode to Mixed or Assembly display mode (see “The Source Windows”) and then set breakpoints at individual assembly instructions. If a single statement is broken across multiple lines, you may be able to set breakpoints on only the starting or ending line of the statement.
Microsoft C, C++, and MASM support macro expansion. Microsoft C and C++ also support inline code generation. These features pose a debugging problem because a macro or an inlined function is expanded where it is used, and CodeView has no information about the source code. This means that you cannot trace or set breakpoints in a macro or inlined function when debugging at the source level.
To work around this condition, you can:
Manually expand the macro to its corresponding source code.
Rewrite the macro as a function.
Suppress inline code generation with the /Ob0 compiler option.
You can often rewrite macros as inline functions, then selectively disable inlining with a compiler option or pragma so that you can step and trace the routine. Rewriting macros as inlined functions can have additional benefits such as argument type checking. However, in some cases the best solution for debugging macros or inline code is to use Assembly or Mixed display mode.
For assembly-language programs, you must declare your segments according to the standard Microsoft high-level language format. MASM versions 5.10 and later provide directives to specify the standard segment order and naming.
Programs that Alter the Environment
Programs that run under CodeView can read the environment table, but they cannot permanently change it. When you exit CodeView, changes to the environment are lost.
Programs that Access the Program Segment Prefix
CodeView processes the command line in the program segment prefix (PSP) the same way as the C/C++ run-time library does. Quotation marks are removed, and exactly one space is left between command-line arguments. As a result, a program that accesses the PSP directly cannot expect the command line to appear exactly as typed.