GNU Compiler Collection (GCC) Internals: Dump types

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9.7.5 Dump types

dump_printf

This is a generic method for doing formatted output. It takes an additional argument dump_kind which signifies the type of dump. This method outputs information only when the dumps are enabled for this particular dump_kind. Note that the caller doesn’t need to know if the particular dump is enabled or not, or even the file name. The caller only needs to decide which dump output information is relevant, and under what conditions. This determines the associated flags.

Consider the following example from loop-unroll.c where an informative message about a loop (along with its location) is printed when any of the following flags is enabled

  • - optimization messages
  • - RTL dumps
  • - detailed dumps 
int report_flags = MSG_OPTIMIZED_LOCATIONS | TDF_RTL | TDF_DETAILS;
dump_printf_loc (report_flags, locus,
                 "loop turned into non-loop; it never loops.\n");
dump_basic_block

Output basic block.

dump_generic_expr

Output generic expression.

dump_gimple_stmt

Output gimple statement.

Note that the above methods also have variants prefixed with _loc, such as dump_printf_loc, which are similar except they also output the source location information.