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9.6.5 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

int report_flags = MSG_OPTIMIZED_LOCATIONS | TDF_RTL | TDF_DETAILS;
dump_printf_loc (report_flags, insn,
                 "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. The _loc variants take a const dump_location_t &. This class can be constructed from a gimple * or from a rtx_insn *, and so callers can pass a gimple * or a rtx_insn * as the _loc argument. The dump_location_t constructor will extract the source location from the statement or instruction, along with the profile count, and the location in GCC’s own source code (or the plugin) from which the dump call was emitted. Only the source location is currently used. There is also a dump_user_location_t class, capturing the source location and profile count, but not the dump emission location, so that locations in the user’s code can be passed around. This can also be constructed from a gimple * and from a rtx_insn *, and it too can be passed as the _loc argument.


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