2005-01-21 Kenneth Zadeck <zadeck@naturalbridge.com>
* df-scan.c (problem_SCAN): Added NULL reset function.
(df_scan_reset_blocks): Added code to call reset block function
(df_bb_refs_delete) Fixed comment.
(df_insn_refs_delete): Made tolerant of deleting non existent info
for dataflow problems that need to be reset.
* df-core.c (df_set_blocks): Ditto.
* df.h (struct df_problem): Added reset_fun.
* df-problems.c (problem_RU, problem_RD, problem_LR, problem_UR,
problem_UREC, problem_CHAIN, problem_RI): Initialized reset_fun field.
(df_chain_insn_reset, df_chain_bb_reset, df_chain_reset): New
functions to clear out all references to def-use or use-def chains.
From-SVN: r110066
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