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 for source-level debugger
From The Free On-line Dictionary of Computing (30 December 2018) :

  source-level debugger
      A debugger that shows the programmer the
     line or expression in the source code that resulted in a
     particular machine code instruction of a running program
     loaded in memory.  This helps the programmer to analyse a
     program's behaviour in the high-level terms like source-level
     flow control constructs, procedure calls, named
     variables, etc instead of machine instructions and memory
     locations.  Source-level debugging also makes it possible to
     step through execution a line at a time and set source-level
     In order to support source-level debugging, the program must
     be compiled with this option enabled so that extra information
     is included in the executable code to identify the
     corresponding positions in the source code.
     A symbolic debugger is one level lower - it displays symbols
     (procedure and variable names) stored in the executable but
     not individual source code lines.
     GDB is a widely used example of a source-level debugger.

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