| /* Routines for reading GIMPLE from a file stream. |
| |
| Copyright (C) 2011-2017 Free Software Foundation, Inc. |
| Contributed by Diego Novillo <dnovillo@google.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/>. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "backend.h" |
| #include "tree.h" |
| #include "gimple.h" |
| #include "ssa.h" |
| #include "gimple-streamer.h" |
| #include "tree-eh.h" |
| #include "gimple-iterator.h" |
| #include "cgraph.h" |
| #include "value-prof.h" |
| |
| /* Read a PHI function for basic block BB in function FN. DATA_IN is |
| the file being read. IB is the input block to use for reading. */ |
| |
| static gphi * |
| input_phi (struct lto_input_block *ib, basic_block bb, struct data_in *data_in, |
| struct function *fn) |
| { |
| unsigned HOST_WIDE_INT ix; |
| tree phi_result; |
| int i, len; |
| gphi *result; |
| |
| ix = streamer_read_uhwi (ib); |
| phi_result = (*SSANAMES (fn))[ix]; |
| len = EDGE_COUNT (bb->preds); |
| result = create_phi_node (phi_result, bb); |
| |
| /* We have to go through a lookup process here because the preds in the |
| reconstructed graph are generally in a different order than they |
| were in the original program. */ |
| for (i = 0; i < len; i++) |
| { |
| tree def = stream_read_tree (ib, data_in); |
| int src_index = streamer_read_uhwi (ib); |
| bitpack_d bp = streamer_read_bitpack (ib); |
| /* Do not cache a location - we do not have API to get pointer to the |
| location in PHI statement and we may trigger reallocation. */ |
| location_t arg_loc = stream_input_location_now (&bp, data_in); |
| basic_block sbb = BASIC_BLOCK_FOR_FN (fn, src_index); |
| |
| edge e = NULL; |
| int j; |
| |
| for (j = 0; j < len; j++) |
| if (EDGE_PRED (bb, j)->src == sbb) |
| { |
| e = EDGE_PRED (bb, j); |
| break; |
| } |
| |
| add_phi_arg (result, def, e, arg_loc); |
| } |
| |
| return result; |
| } |
| |
| |
| /* Read a statement with tag TAG in function FN from block IB using |
| descriptors in DATA_IN. */ |
| |
| static gimple * |
| input_gimple_stmt (struct lto_input_block *ib, struct data_in *data_in, |
| enum LTO_tags tag) |
| { |
| gimple *stmt; |
| enum gimple_code code; |
| unsigned HOST_WIDE_INT num_ops; |
| size_t i; |
| struct bitpack_d bp; |
| bool has_hist; |
| |
| code = lto_tag_to_gimple_code (tag); |
| |
| /* Read the tuple header. */ |
| bp = streamer_read_bitpack (ib); |
| num_ops = bp_unpack_var_len_unsigned (&bp); |
| stmt = gimple_alloc (code, num_ops); |
| stmt->no_warning = bp_unpack_value (&bp, 1); |
| if (is_gimple_assign (stmt)) |
| stmt->nontemporal_move = bp_unpack_value (&bp, 1); |
| stmt->has_volatile_ops = bp_unpack_value (&bp, 1); |
| has_hist = bp_unpack_value (&bp, 1); |
| stmt->subcode = bp_unpack_var_len_unsigned (&bp); |
| |
| /* Read location information. Caching here makes no sense until streamer |
| cache can handle the following gimple_set_block. */ |
| gimple_set_location (stmt, stream_input_location_now (&bp, data_in)); |
| |
| /* Read lexical block reference. */ |
| gimple_set_block (stmt, stream_read_tree (ib, data_in)); |
| |
| /* Read in all the operands. */ |
| switch (code) |
| { |
| case GIMPLE_RESX: |
| gimple_resx_set_region (as_a <gresx *> (stmt), |
| streamer_read_hwi (ib)); |
| break; |
| |
| case GIMPLE_EH_MUST_NOT_THROW: |
| gimple_eh_must_not_throw_set_fndecl ( |
| as_a <geh_mnt *> (stmt), |
| stream_read_tree (ib, data_in)); |
| break; |
| |
| case GIMPLE_EH_DISPATCH: |
| gimple_eh_dispatch_set_region (as_a <geh_dispatch *> (stmt), |
| streamer_read_hwi (ib)); |
| break; |
| |
| case GIMPLE_ASM: |
| { |
| /* FIXME lto. Move most of this into a new gimple_asm_set_string(). */ |
| gasm *asm_stmt = as_a <gasm *> (stmt); |
| tree str; |
| asm_stmt->ni = streamer_read_uhwi (ib); |
| asm_stmt->no = streamer_read_uhwi (ib); |
| asm_stmt->nc = streamer_read_uhwi (ib); |
| asm_stmt->nl = streamer_read_uhwi (ib); |
| str = streamer_read_string_cst (data_in, ib); |
| asm_stmt->string = TREE_STRING_POINTER (str); |
| } |
| /* Fallthru */ |
| |
| case GIMPLE_ASSIGN: |
| case GIMPLE_CALL: |
| case GIMPLE_RETURN: |
| case GIMPLE_SWITCH: |
| case GIMPLE_LABEL: |
| case GIMPLE_COND: |
| case GIMPLE_GOTO: |
| case GIMPLE_DEBUG: |
| for (i = 0; i < num_ops; i++) |
| { |
| tree *opp, op = stream_read_tree (ib, data_in); |
| gimple_set_op (stmt, i, op); |
| if (!op) |
| continue; |
| |
| opp = gimple_op_ptr (stmt, i); |
| if (TREE_CODE (*opp) == ADDR_EXPR) |
| opp = &TREE_OPERAND (*opp, 0); |
| while (handled_component_p (*opp)) |
| opp = &TREE_OPERAND (*opp, 0); |
| /* At LTO output time we wrap all global decls in MEM_REFs to |
| allow seamless replacement with prevailing decls. Undo this |
| here if the prevailing decl allows for this. |
| ??? Maybe we should simply fold all stmts. */ |
| if (TREE_CODE (*opp) == MEM_REF |
| && TREE_CODE (TREE_OPERAND (*opp, 0)) == ADDR_EXPR |
| && integer_zerop (TREE_OPERAND (*opp, 1)) |
| && (TREE_THIS_VOLATILE (*opp) |
| == TREE_THIS_VOLATILE |
| (TREE_OPERAND (TREE_OPERAND (*opp, 0), 0))) |
| && !TYPE_REF_CAN_ALIAS_ALL (TREE_TYPE (TREE_OPERAND (*opp, 1))) |
| && (TREE_TYPE (*opp) |
| == TREE_TYPE (TREE_TYPE (TREE_OPERAND (*opp, 1)))) |
| && (TREE_TYPE (*opp) |
| == TREE_TYPE (TREE_OPERAND (TREE_OPERAND (*opp, 0), 0)))) |
| *opp = TREE_OPERAND (TREE_OPERAND (*opp, 0), 0); |
| } |
| if (gcall *call_stmt = dyn_cast <gcall *> (stmt)) |
| { |
| if (gimple_call_internal_p (call_stmt)) |
| gimple_call_set_internal_fn |
| (call_stmt, streamer_read_enum (ib, internal_fn, IFN_LAST)); |
| else |
| gimple_call_set_fntype (call_stmt, stream_read_tree (ib, data_in)); |
| } |
| break; |
| |
| case GIMPLE_NOP: |
| case GIMPLE_PREDICT: |
| break; |
| |
| case GIMPLE_TRANSACTION: |
| gimple_transaction_set_label_norm (as_a <gtransaction *> (stmt), |
| stream_read_tree (ib, data_in)); |
| gimple_transaction_set_label_uninst (as_a <gtransaction *> (stmt), |
| stream_read_tree (ib, data_in)); |
| gimple_transaction_set_label_over (as_a <gtransaction *> (stmt), |
| stream_read_tree (ib, data_in)); |
| break; |
| |
| default: |
| internal_error ("bytecode stream: unknown GIMPLE statement tag %s", |
| lto_tag_name (tag)); |
| } |
| |
| /* Update the properties of symbols, SSA names and labels associated |
| with STMT. */ |
| if (code == GIMPLE_ASSIGN || code == GIMPLE_CALL) |
| { |
| tree lhs = gimple_get_lhs (stmt); |
| if (lhs && TREE_CODE (lhs) == SSA_NAME) |
| SSA_NAME_DEF_STMT (lhs) = stmt; |
| } |
| else if (code == GIMPLE_ASM) |
| { |
| gasm *asm_stmt = as_a <gasm *> (stmt); |
| unsigned i; |
| |
| for (i = 0; i < gimple_asm_noutputs (asm_stmt); i++) |
| { |
| tree op = TREE_VALUE (gimple_asm_output_op (asm_stmt, i)); |
| if (TREE_CODE (op) == SSA_NAME) |
| SSA_NAME_DEF_STMT (op) = stmt; |
| } |
| } |
| |
| /* Reset alias information. */ |
| if (code == GIMPLE_CALL) |
| gimple_call_reset_alias_info (as_a <gcall *> (stmt)); |
| |
| /* Mark the statement modified so its operand vectors can be filled in. */ |
| gimple_set_modified (stmt, true); |
| if (has_hist) |
| stream_in_histogram_value (ib, stmt); |
| |
| return stmt; |
| } |
| |
| |
| /* Read a basic block with tag TAG from DATA_IN using input block IB. |
| FN is the function being processed. */ |
| |
| void |
| input_bb (struct lto_input_block *ib, enum LTO_tags tag, |
| struct data_in *data_in, struct function *fn, |
| int count_materialization_scale) |
| { |
| unsigned int index; |
| basic_block bb; |
| gimple_stmt_iterator bsi; |
| |
| /* This routine assumes that CFUN is set to FN, as it needs to call |
| basic GIMPLE routines that use CFUN. */ |
| gcc_assert (cfun == fn); |
| |
| index = streamer_read_uhwi (ib); |
| bb = BASIC_BLOCK_FOR_FN (fn, index); |
| |
| bb->count = apply_scale (streamer_read_gcov_count (ib), |
| count_materialization_scale); |
| bb->frequency = streamer_read_hwi (ib); |
| bb->flags = streamer_read_hwi (ib); |
| |
| /* LTO_bb1 has statements. LTO_bb0 does not. */ |
| if (tag == LTO_bb0) |
| return; |
| |
| bsi = gsi_start_bb (bb); |
| tag = streamer_read_record_start (ib); |
| while (tag) |
| { |
| gimple *stmt = input_gimple_stmt (ib, data_in, tag); |
| gsi_insert_after (&bsi, stmt, GSI_NEW_STMT); |
| |
| /* After the statement, expect a 0 delimiter or the EH region |
| that the previous statement belongs to. */ |
| tag = streamer_read_record_start (ib); |
| lto_tag_check_set (tag, 2, LTO_eh_region, LTO_null); |
| |
| if (tag == LTO_eh_region) |
| { |
| HOST_WIDE_INT region = streamer_read_hwi (ib); |
| gcc_assert (region == (int) region); |
| add_stmt_to_eh_lp (stmt, region); |
| } |
| |
| tag = streamer_read_record_start (ib); |
| } |
| |
| tag = streamer_read_record_start (ib); |
| while (tag) |
| { |
| input_phi (ib, bb, data_in, fn); |
| tag = streamer_read_record_start (ib); |
| } |
| } |