#include "config.h"#include "system.h"#include "coretypes.h"#include "tm.h"#include "rtl.h"#include "tm_p.h"#include "insn-config.h"#include "recog.h"#include "function.h"#include "regs.h"#include "alloc-pool.h"#include "flags.h"#include "hard-reg-set.h"#include "basic-block.h"#include "sbitmap.h"#include "bitmap.h"#include "df.h"#include "tree-pass.h"#include "params.h"
Macros | |
| #define | BB_LAST_CHANGE_AGE(bb) ((ptrdiff_t)(bb)->aux) |
Variables | |
| struct bitmap_obstack | reg_obstack |
| bitmap_obstack | df_bitmap_obstack |
| struct df_d * | df |
| static struct df_problem | user_problem |
| static struct dataflow | user_dflow |
Macro Definition Documentation
| #define BB_LAST_CHANGE_AGE | ( | bb | ) | ((ptrdiff_t)(bb)->aux) |
Return time BB when it was visited for last time.
Function Documentation
| DEBUG_FUNCTION void debug_df_chain | ( | ) |
| DEBUG_FUNCTION void debug_df_defno | ( | ) |
| DEBUG_FUNCTION void debug_df_insn | ( | ) |
Functions for debugging from GDB.
| DEBUG_FUNCTION void debug_df_ref | ( | ) |
| DEBUG_FUNCTION void debug_df_reg | ( | ) |
| DEBUG_FUNCTION void debug_df_regno | ( | ) |
| DEBUG_FUNCTION void debug_df_useno | ( | ) |
| void debug_regset | ( | regset | ) |
Print a human-readable representation of R on the standard error stream. This function is designed to be used from within the debugger.
| DEBUG_FUNCTION void debug_regset | ( | ) |
References df_d::blocks_to_analyze, df_dump_start(), and EXECUTE_IF_SET_IN_BITMAP.
| void df_add_problem | ( | ) |
Add PROBLEM (and any dependent problems) to the DF instance.
First try to add the dependent problem.
Check to see if this problem has already been defined. If it has, just return that instance, if not, add it to the end of the vector.
Make a new one and add it to the end.
Keep the defined problems ordered by index. This solves the problem that RI will use the information from UREC if UREC has been defined, or from LIVE if LIVE is defined and otherwise LR. However for this to work, the computation of RI must be pushed after which ever of those problems is defined, but we do not require any of those except for LR to have actually been defined.
Referenced by df_lr_verify_solution_end().
| void df_analyze | ( | void | ) |
Analyze dataflow info for the basic blocks specified by the bitmap BLOCKS, or for the whole CFG if BLOCKS is zero.
These should be the same.
We need to do this before the df_verify_all because this is not kept incrementally up to date.
Make sure that we have pruned any unreachable blocks from these sets.
Skip over the DF_SCAN problem.
Referenced by compute_bb_for_insn(), copyprop_hardreg_forward(), dse_step4(), duplicate_computed_gotos(), mark_artificial_uses(), move_unallocated_pseudos(), and split_live_ranges_for_shrink_wrap().
| void df_analyze_problem | ( | struct dataflow * | dflow, |
| bitmap | blocks_to_consider, | ||
| int * | postorder, | ||
| int | n_blocks | ||
| ) |
Execute dataflow analysis on a single dataflow problem.
BLOCKS_TO_CONSIDER are the blocks whose solution can either be examined or will be computed. For calls from DF_ANALYZE, this is the set of blocks that has been passed to DF_SET_BLOCKS.
(Re)Allocate the datastructures necessary to solve the problem.
Set up the problem and compute the local information.
Solve the equations.
Massage the solution.
Referenced by fast_dce().
| void df_bb_delete | ( | ) |
Free all of the per basic block dataflow from all of the problems. This is typically called before a basic block is deleted and the problem will be reanalyzed.
References df_lr, and gcc_assert.
| df_ref df_bb_regno_first_def_find | ( | ) |
Return first def of REGNO within BB.
References df_d::changeable_flags, DF_EQ_NOTES, DF_INSN_UID_EQ_USES, DF_INSN_UID_USES, DF_REF_REGNO, gcc_assert, GET_CODE, INSN_UID, NULL, REG_P, REGNO, and SUBREG_REG.
| df_ref df_bb_regno_last_def_find | ( | ) |
Return last def of REGNO within BB.
| void df_bb_replace | ( | ) |
Shove NEW_BLOCK in at OLD_INDEX. Called from ifcvt to hack a block. There is no excuse for people to do this kind of thing.
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Clear the dirty bits. This is called from places that delete blocks.
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Clear basic block info.
| int df_clear_flags | ( | ) |
Clear the MASK flags in the DFLOW problem. The old flags are returned. If a flag is not allowed to be changed this will fail if checking is enabled.
References bitmap_print(), df_d::blocks_to_analyze, and dump_file.
Referenced by df_insn_rescan_debug_internal(), df_lr_confluence_0(), fast_dce(), and split_live_ranges_for_shrink_wrap().
| void df_compact_blocks | ( | void | ) |
Called from the rtl_compact_blocks to reorganize the problems basic block info.
Need to reorganize the out_of_date_transfer_functions for the
dflow problem.
Now shuffle the block info for the problem.
Copy the bb info from the problem tmps to the proper
place in the block_info vector. Null out the copied
item. The entry and exit blocks never move. Shuffle the bits in the basic_block indexed arrays.
Referenced by unlink_block().
| void df_dump | ( | ) |
Dump dataflow info.
Referenced by mark_artificial_uses().
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Dump the top or bottom of the block information for BB.
References df_chain_dump(), DF_REF_CHAIN, and df_ref_dump().
| void df_dump_bottom | ( | ) |
Dump the bottom of the block information for BB.
| void df_dump_insn_bottom | ( | ) |
Dump information about INSN after dumping INSN itself.
References BLOCK_FOR_INSN, DF_INSN_INFO_GET, DF_INSN_INFO_LUID, and INSN_UID.
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Dump information about INSN just before or after dumping INSN itself.
References DF_INSN_UID_DEFS, DF_INSN_UID_EQ_USES, DF_INSN_UID_LUID, DF_INSN_UID_MWS, DF_INSN_UID_USES, df_mws_dump(), and df_refs_chain_dump().
Referenced by df_dump_start().
| void df_dump_insn_top | ( | ) |
Dump information about INSN before dumping INSN itself.
References df_insn_uid_debug(), and INSN_UID.
| void df_dump_region | ( | ) |
Dump dataflow info for df->blocks_to_analyze.
References dataflow::computed, df_problem::dump_insn_bottom_fun, df_problem::dump_insn_top_fun, df_d::num_problems_defined, dataflow::problem, and df_d::problems_in_order.
| void df_dump_start | ( | ) |
Dump the introductory information for each problem defined.
References df_dump_insn_problem_data().
Referenced by debug_regset().
| void df_dump_top | ( | ) |
Dump the top of the block information for BB.
References DF_MWS_REG_DEF_P.
Referenced by commit_one_edge_insertion().
| df_ref df_find_def | ( | ) |
Finds the reference corresponding to the definition of REG in INSN. DF is the dataflow object.
| df_ref df_find_use | ( | ) |
Finds the reference corresponding to the use of REG in INSN. DF is the dataflow object.
References reg_names.
Referenced by invariant_for_use().
| void df_finish_pass | ( | ) |
Remove all of the problems that are not permanent. Scanning, LR and (at -O2 or higher) LIVE are permanent, the rest are removable. Also clear all of the changeable_flags.
Clear all of the flags.
Set the focus back to the whole function.
References gcc_assert, df_problem::id, NULL, dataflow::optional_p, dataflow::problem, df_d::problems_by_index, df_d::problems_in_order, and df_problem::remove_problem_fun.
Referenced by biv_p(), and duplicate_computed_gotos().
| bool df_get_bb_dirty | ( | ) |
Return true if BB needs it's transfer functions recomputed.
References bitmap_initialize, df_d::num_problems_defined, and df_d::problems_in_order.
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Allocation for dataflow support routines. Copyright (C) 1999-2013 Free Software Foundation, Inc. Originally contributed by Michael P. Hayes (m.hayes@elec.canterbury.ac.nz, mhayes@redhat.com) Major rewrite contributed by Danny Berlin (dberlin@dberlin.org) and Kenneth Zadeck (zadeck@naturalbridge.com).
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with GCC; see the file COPYING3. If not see http://www.gnu.org/licenses/.
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Get basic block info.
References bitmap_set_bit, df_mark_solutions_dirty(), basic_block_def::flags, basic_block_def::index, df_d::num_problems_defined, dataflow::out_of_date_transfer_functions, and df_d::problems_in_order.
| int df_get_n_blocks | ( | ) |
Return the number of basic blocks from the last call to df_analyze.
References dataflow::block_info, df_problem::block_info_elt_size, dataflow::block_info_size, NULL, and dataflow::problem.
| int* df_get_postorder | ( | ) |
Return a pointer to the array of basic blocks in the reverse postorder. Depending on the direction of the dataflow problem, it returns either the usual reverse postorder array or the reverse postorder of inverted traversal.
References dataflow::block_info, df_problem::block_info_elt_size, gcc_assert, and dataflow::problem.
| void df_grow_bb_info | ( | ) |
Grow the bb_info array.
References dataflow::block_info, df_problem::block_info_elt_size, df_set_bb_info(), FOR_EACH_BB, basic_block_def::index, NUM_FIXED_BLOCKS, and dataflow::problem.
| DEBUG_FUNCTION void df_insn_debug | ( | ) |
| DEBUG_FUNCTION void df_insn_debug_regno | ( | ) |
References df_chain_dump().
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Referenced by df_dump_insn_top().
| void df_mark_solutions_dirty | ( | void | ) |
Mark the solutions as being out of date.
References bitmap_clear_bit(), basic_block_def::index, df_d::num_problems_defined, dataflow::out_of_date_transfer_functions, and df_d::problems_in_order.
Referenced by connect_dest(), and df_get_bb_info().
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Referenced by df_dump_insn_problem_data().
| void df_print_regset | ( | ) |
Write information about registers and basic blocks into FILE. This is part of making a debugging dump.
Referenced by df_live_confluence_n(), df_live_transfer_function(), df_lr_finalize(), df_lr_transfer_function(), df_remove_dead_eq_notes(), df_scan_free(), df_whole_mw_reg_dead_p(), and get_stored_val().
| void df_print_word_regset | ( | ) |
Write information about registers and basic blocks into FILE. The bitmap is in the form used by df_byte_lr. This is part of making a debugging dump.
References dataflow::computed, df_problem::dump_start_fun, dataflow::problem, and df_d::problems_in_order.
Referenced by df_word_lr_bb_local_compute(), and gate_ud_dce().
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Remove the entries not in BLOCKS from the LIST of length LEN, preserving the order of the remaining entries. Returns the length of the resulting list.
| DEBUG_FUNCTION void df_ref_debug | ( | ) |
Referenced by df_create_unused_note().
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Referenced by df_dump_bb_problem_data().
| void df_refs_chain_dump | ( | ) |
References DF_REG_DEF_CHAIN, DF_REG_EQ_USE_CHAIN, DF_REG_USE_CHAIN, and df_regs_chain_dump().
Referenced by df_dump_insn_problem_data().
| bool df_reg_used | ( | ) |
Return true if REG is referenced in INSN, zero otherwise.
| DEBUG_FUNCTION void df_regno_debug | ( | ) |
| void df_regs_chain_dump | ( | ) |
Dump either a ref-def or reg-use chain.
Referenced by df_refs_chain_dump().
| void df_remove_problem | ( | ) |
Delete a DFLOW problem (and any problems that depend on this problem).
Delete any problems that depended on this problem first.
Now remove this problem.
References NULL, df_d::num_problems_defined, and df_d::problems_in_order.
Referenced by init_dce(), and split_live_ranges_for_shrink_wrap().
| void df_set_bb_dirty | ( | ) |
Mark BB as needing it's transfer functions as being out of date.
References bitmap_bit_p, bitmap_clear(), bitmap_copy(), bitmap_set_bit, ENTRY_BLOCK, EXIT_BLOCK, FOR_EACH_BB, basic_block_def::index, NUM_FIXED_BLOCKS, and dataflow::out_of_date_transfer_functions.
Referenced by cond_exec_find_if_block(), df_get_eh_block_artificial_uses(), df_grow_insn_info(), and fixup_partition_crossing().
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Set basic block info.
Referenced by df_grow_bb_info().
| void df_set_blocks | ( | ) |
Set the blocks that are to be considered for analysis. If this is not called or is called with null, the entire function in analyzed.
This block is called to change the focus from one subset
to another.
This block of code is executed to change the focus from
the entire function to a subset. This block is executed to reset the focus to the entire
function. Setting the blocks causes the refs to be unorganized since only the refs in the blocks are seen.
| int df_set_flags | ( | ) |
Set the MASK flags in the DFLOW problem. The old flags are returned. If a flag is not allowed to be changed this will fail if checking is enabled.
References df_d::changeable_flags.
Referenced by clear_iv_info(), df_insn_rescan_debug_internal(), df_lr_confluence_0(), dse_step4(), duplicate_computed_gotos(), fast_dce(), and mark_artificial_uses().
| void df_simple_dataflow | ( | enum df_flow_dir | dir, |
| df_init_function | init_fun, | ||
| df_confluence_function_0 | con_fun_0, | ||
| df_confluence_function_n | con_fun_n, | ||
| df_transfer_function | trans_fun, | ||
| bitmap | blocks, | ||
| int * | postorder, | ||
| int | n_blocks | ||
| ) |
Interface for calling iterative dataflow with user defined confluence and transfer functions. All that is necessary is to supply DIR, a direction, CONF_FUN_0, a confluence function for blocks with no logical preds (or NULL), CONF_FUN_N, the normal confluence function, TRANS_FUN, the basic block transfer function, and BLOCKS, the set of blocks to examine, POSTORDER the blocks in postorder, and N_BLOCKS, the number of blocks in POSTORDER.
References df_d::num_problems_defined, df_d::problems_in_order, and dataflow::solutions_dirty.
| void df_verify | ( | void | ) |
Verify that there is a place for everything and everything is in its place. This is too expensive to run after every pass in the mainline. However this is an excellent debugging tool if the dataflow information is not being updated properly. You can just sprinkle calls in until you find the place that is changing an underlying structure without calling the proper updating routine.
| void df_worklist_dataflow | ( | struct dataflow * | dataflow, |
| bitmap | blocks_to_consider, | ||
| int * | blocks_in_postorder, | ||
| int | n_blocks | ||
| ) |
Worklist-based dataflow solver. It uses sbitmap as a worklist, with "n"-th bit representing the n-th block in the reverse-postorder order. The solver is a double-queue algorithm similar to the "double stack" solver from Cooper, Harvey and Kennedy, "Iterative data-flow analysis, Revisited". The only significant difference is that the worklist in this implementation is always sorted in RPO of the CFG visiting direction.
BBINDEX_TO_POSTORDER maps the bb->index to the reverse postorder.
Initialize the array to an out-of-bound value.
Initialize the considered map.
Initialize the mapping of block index to postorder.
Add all blocks to the worklist.
Initialize the problem.
Solve it.
Referenced by df_lr_confluence_0().
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Main dataflow solver loop.
DATAFLOW is problem we are solving, PENDING is worklist of basic blocks we need to visit. BLOCK_IN_POSTORDER is array of size N_BLOCKS specifying postorder in BBs and BBINDEX_TO_POSTORDER is array mapping back BB->index to postorder position. PENDING will be freed.
The worklists are bitmaps indexed by postorder positions.
The function implements standard algorithm for dataflow solving with two worklists (we are processing WORKLIST and storing new BBs to visit in PENDING).
As an optimization we maintain ages when BB was changed (stored in bb->aux) and when it was last visited (stored in last_visit_age). This avoids need to re-do confluence function for edges to basic blocks whose source did not change since destination was visited last time.
Double-queueing. Worklist is for the current iteration, and pending is for the next.
Swap pending and worklist.
Dump statistics.
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Helper function for df_worklist_dataflow. Propagate the dataflow backward.
Calculate <conf_op> of incoming edges.
The out set of this block has changed.
Propagate to the outgoing blocks.
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Helper function for df_worklist_dataflow. Propagate the dataflow forward. Given a BB_INDEX, do the dataflow propagation and set bits on for successors in PENDING if the out set of the dataflow has changed.
AGE specify time when BB was visited last time. AGE of 0 means we are visiting for first time and need to compute transfer function to initialize datastructures. Otherwise we re-do transfer function only if something change while computing confluence functions. We need to compute confluence only of basic block that are younger then last visit of the BB.
Return true if BB info has changed. This is always the case in the first visit.
Calculate <conf_op> of incoming edges.
The out set of this block has changed.
Propagate to the outgoing blocks.
| void dump_regset | ( | ) |
Write information about registers and basic blocks into FILE. This is part of making a debugging dump.
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| rtl_opt_pass* make_pass_df_finish | ( | ) |
References BASIC_BLOCK, and changed.
| rtl_opt_pass* make_pass_df_initialize_no_opt | ( | ) |
| rtl_opt_pass* make_pass_df_initialize_opt | ( | ) |
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Free all the dataflow info and the DF structure. This should be called from the df_finish macro which also NULLs the parm.
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Set up the dataflow instance for the entire back end.
Set this to a conservative value. Stack_ptr_mod will compute it correctly later.
These three problems are permanent.
After reload, some ports add certain bits to regs_ever_live so this cannot be reset.
Variable Documentation
| struct df_d* df |
This is used for debugging and for the dumpers to find the latest instance so that the df info can be added to the dumps. This should not be used by regular code.
Referenced by best_gain_for_invariant(), df_chain_finalize(), df_chain_remove_problem(), df_free_ref(), df_get_eh_block_artificial_uses(), df_grow_insn_info(), df_insn_rescan_debug_internal(), df_lr_confluence_0(), df_lr_init(), df_mw_compare(), df_record_entry_block_defs(), df_ref_chain_delete(), df_ref_change_reg_with_loc_1(), df_reorganize_refs_by_insn_bb(), df_scan_add_problem(), df_scan_free(), print_pred_bbs(), split_live_ranges_for_shrink_wrap(), and unlink_block().
| bitmap_obstack df_bitmap_obstack |
An obstack for bitmap not related to specific dataflow problems. This obstack should e.g. be used for bitmaps with a short life time such as temporary bitmaps.
Referenced by df_get_eh_block_artificial_uses(), df_insn_rescan_debug_internal(), and df_lr_verify_solution_end().
| struct bitmap_obstack reg_obstack |
The obstack on which regsets are allocated.
Referenced by get_stored_val(), and remove_pseudos().
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