dbx allows you to set breakpoints on inlined functions. Control stops at the first instruction from the inlined function in the caller. You can perform the same dbx operations (for example, step, next, and list commands) on inlined functions as you can perform on non-inlined functions.
The where command shows the call stack with the inlined function and the parameters if location information for the inlined parameters is available.
The up and down commands for moving up and down the call stack are also supported for inlined functions.
Local variables from the caller are not available in the inline frame.
Registers, if shown, are those from the caller's window.
Functions that the compilers might inline include the C++ inline functions, the C functions with the C99 inline keyword, and any other functions that the compiler deems profitable for performance.
The Oracle Solaris Studio 12.4: Performance Analyzer contains information that might be helpful when debugging an optimized program.