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1.8.1.1
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GCC Middle and Back End API Reference
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Data Structures | |
| struct | sccs |
| struct | scc_entry |
Variables | |
| static unsigned int | next_dfs_num |
| static vec< scc_entry > | sccstack |
| static struct pointer_map_t * | sccstate |
| static struct obstack | sccstate_obstack |
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static |
@verbatim
Write the GIMPLE representation to a file stream.
Copyright (C) 2009-2013 Free Software Foundation, Inc. Contributed by Kenneth Zadeck zadeck@naturalbridge.com Re-implemented 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/.
Clear the line info stored in DATA_IN.
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Copy the function body of NODE without deserializing.
We may have renamed the declaration, e.g., a static function.
Do a bit copy of the function body.
Copy decls.
The out state must have the same indices and the in state.
So just copy the vector. All the encoders in the in state
must be empty where we reach here.
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Create the output block and return it. SECTION_TYPE is LTO_section_function_body or LTO_static_initializer.
Referenced by read_inline_edge_summary().
| void destroy_output_block | ( | ) |
Destroy the output block OB.
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DFS walk EXPR and stream SCCs of tree bodies if they are not already in the streamer cache. Main routine called for each visit of EXPR.
Handle special cases.
Do not DFS walk into indexable trees.
Check if we already streamed EXPR.
Not yet visited. DFS recurse and push it onto the stack.
Walk any LTO-specific edges.
Handle DECL_INITIAL for symbols.
See if we found an SCC.
Pop the SCC and compute its size.
No need to compute hashes for LTRANS units, we don't perform
any merging there. Put the entries with the least number of collisions first.
Write LTO_tree_scc.
Write size-1 SCCs without wrapping them inside SCC bundles.
All INTEGER_CSTs need to be handled this way as we need
their type to materialize them. Also builtins are handled
this way.
??? We still wrap these in LTO_tree_scc so at the
input side we can properly identify the tree we want
to ultimatively return. Write the size of the SCC entry candidates.
Write all headers and populate the streamer cache.
Write the header, containing everything needed to
materialize EXPR on the reading side. Write the bitpacks and tree references.
Mark the end of the tree.
Finally truncate the vector.
References first.
Referenced by hash_scc().
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Handle the tree EXPR in the DFS walk with SCC state EXPR_STATE and DFS recurse for all tree edges originating from it.
Drop names that were created for anonymous entities.
Note, DECL_INITIAL is not handled here. Since DECL_INITIAL needs
special handling in LTO, it must be handled by streamer hooks. Do not follow DECL_ABSTRACT_ORIGIN. We cannot handle debug information
for early inlining so drop it on the floor instead of ICEing in
dwarf2out.c. Make sure we don't inadvertently set the assembler name.
Do not follow TYPE_POINTER_TO or TYPE_REFERENCE_TO. They will be
reconstructed during fixup. Do not follow TYPE_NEXT_VARIANT, we reconstruct the variant lists
during fixup. TYPE_CANONICAL is re-computed during type merging, so no need
to follow it here. ??? FIXME. See also streamer_write_chain.
Follow BLOCK_ABSTRACT_ORIGIN for the limited cases we can
handle - those that represent inlined function scopes.
For the drop rest them on the floor instead of ICEing
in dwarf2out.c. Do not follow BLOCK_NONLOCALIZED_VARS. We cannot handle debug
information for early inlined BLOCKs so drop it on the floor instead
of ICEing in dwarf2out.c. BLOCK_FRAGMENT_ORIGIN and BLOCK_FRAGMENT_CHAIN is not live at LTO
streaming time. Do not output BLOCK_SUBBLOCKS. Instead on streaming-in this
list is re-constructed from BLOCK_SUPERCONTEXT. Note that the number of BINFO slots has already been emitted in
EXPR's header (see streamer_write_tree_header) because this length
is needed to build the empty BINFO node on the reader side. The number of BINFO_BASE_ACCESSES has already been emitted in
EXPR's bitfield section. Do not walk BINFO_INHERITANCE_CHAIN, BINFO_SUBVTT_INDEX
and BINFO_VPTR_INDEX; these are used by C++ FE only.
References gdbhooks::IDENTIFIER_NODE.
Referenced by hash_scc().
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For EXPR lookup and return what we want to stream to OB as DECL_INITIAL.
Handle DECL_INITIAL for symbols.
Referenced by hash_scc().
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Return a hash value for the SCC on the SCC stack from FIRST with size SIZE.
Compute hash values for the SCC members.
Sort the SCC of type, hash pairs so that when we mix in
all members of the SCC the hash value becomes independent on
the order we visited the SCC. Disregard hashes equal to
the hash of the tree we mix into because we cannot guarantee
a stable sort for those across different TUs. Skip same hashes.
References DFS_write_tree(), DFS_write_tree_body(), sccs::dfsnum, first, get_symbol_initial_value(), sccs::low, sccstate_obstack, and streamer_handle_as_builtin_p().
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Return a hash value for the tree T.
Hash TS_BASE.
DECL_IN_TEXT_SECTION is set during final asm output only.
For pointers factor in the pointed-to type recursively as
we cannot recurse through only pointers.
??? We can generalize this by keeping track of the
in-SCC edges for each tree (or arbitrarily the first
such edge) and hashing that in in a second stage
(instead of the quadratic mixing of the SCC we do now). Drop names that were created for anonymous entities.
??? Hash DECL_INITIAL as streamed. Needs the output-block to
be able to call get_symbol_initial_value. Do not walk BINFO_INHERITANCE_CHAIN, BINFO_SUBVTT_INDEX
and BINFO_VPTR_INDEX; these are used by C++ FE only.
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inlinestatic |
Return true if EXPR is a tree node that can be written to disk.
Notice that we reject SSA_NAMEs as well. We only emit the SSA
name version in lto_output_tree_ref (see output_ssa_names).
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Return the written size of STATE.
References symtab_node_base::decl, IPA_REF_ALIAS, symtab_node_base::ref_list, and ipa_ref::referring.
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Main entry point from the pass manager.
Initialize the streamer.
Process only the functions with bodies.
Emit the callgraph after emitting function bodies. This needs to
be done now to make sure that all the statements in every function
have been renumbered so that edges can be associated with call
statements using the statement UIDs.
References lto_output_data_stream(), lto_tree_ref_encoder_get_tree(), streamer_tree_cache_lookup(), and output_block::writer_cache.
| void lto_output_decl_state_refs | ( | struct output_block * | ob, |
| struct lto_output_stream * | out_stream, | ||
| struct lto_out_decl_state * | state | ||
| ) |
Write all the references in an lto_out_decl_state STATE using output block OB and output stream OUT_STREAM.
Write reference to FUNCTION_DECL. If there is not function,
write reference to void_type_node.
| void lto_output_decl_state_streams | ( | struct output_block * | ob, |
| struct lto_out_decl_state * | state | ||
| ) |
Write all the streams in an lto_out_decl_state STATE using output block OB and output stream OUT_STREAM.
| void lto_output_location | ( | struct output_block * | ob, |
| struct bitpack_d * | bp, | ||
| location_t | loc | ||
| ) |
Output info about new location into bitpack BP. After outputting bitpack, lto_output_location_data has to be done to output actual data.
| void lto_output_toplevel_asms | ( | void | ) |
Emit toplevel asms.
Make string 0 be a NULL string.
The entire header stream is computed here.
Write the header.
Put all of the gimple and the string table out the asm file as a
block of text.
| void lto_output_tree | ( | struct output_block * | ob, |
| tree | expr, | ||
| bool | ref_p, | ||
| bool | this_ref_p | ||
| ) |
Emit the physical representation of tree node EXPR to output block OB. If THIS_REF_P is true, the leaves of EXPR are emitted as references via lto_output_tree_ref. REF_P is used for streaming siblings of EXPR.
If a node has already been streamed out, make sure that
we don't write it more than once. Otherwise, the reader
will instantiate two different nodes for the same object. This is the first time we see EXPR, write all reachable
trees to OB. Protect against recursion which means disconnect between
what tree edges we walk in the DFS walk and what edges
we stream out. Start the DFS walk.
Save ob state ...
let's see ...
Finally append a reference to the tree we were writing.
??? If expr ended up as a singleton we could have
inlined it here and avoid outputting a reference.
References eh_catch_d::filter_list, eh_catch_d::label, LTO_eh_catch, streamer_write_record_start(), and eh_catch_d::type_list.
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Emit the physical representation of tree node EXPR to output block OB. If THIS_REF_P is true, the leaves of EXPR are emitted as references via lto_output_tree_ref. REF_P is used for streaming siblings of EXPR.
MD and NORMAL builtins do not need to be written out
completely as they are always instantiated by the
compiler on startup. The only builtins that need to
be written out are BUILT_IN_FRONTEND. For all other
builtins, we simply write the class and code. Shared INTEGER_CST nodes are special because they need their
original type to be materialized by the reader (to implement
TYPE_CACHED_VALUES). This is the first time we see EXPR, write its fields
to OB.
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If EXPR is an indexable tree node, output a reference to it to output block OB. Otherwise, output the physical representation of EXPR to OB.
No other node is indexable, so it should have been handled by
lto_output_tree.
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Write a physical representation of tree node EXPR to output block OB. If REF_P is true, the leaves of EXPR are emitted as references via lto_output_tree_ref. IX is the index into the streamer cache where EXPR is stored.
Write the header, containing everything needed to materialize
EXPR on the reading side. Mark the end of EXPR.
References streamer_handle_as_builtin_p(), streamer_tree_cache_insert(), streamer_write_builtin(), tree_is_indexable(), and output_block::writer_cache.
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Write a physical representation of tree node EXPR to output block OB. If REF_P is true, the leaves of EXPR are emitted as references via lto_output_tree_ref. IX is the index into the streamer cache where EXPR is stored.
Pack all the non-pointer fields in EXPR into a bitpack and write
the resulting bitpack. Write all the pointer fields in EXPR.
Write any LTO-specific data to OB.
Handle DECL_INITIAL for symbols.
| ipa_opt_pass_d* make_pass_ipa_lto_finish_out | ( | ) |
| ipa_opt_pass_d* make_pass_ipa_lto_gimple_out | ( | ) |
References targetm.
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Output the cfg.
Output the number of the highest basic block.
Output the successors and the edge flags.
??? The cfgloop interface is tied to cfun.
Output the number of loops.
Output each loop, skipping the tree root which has number zero.
Write the index of the loop header. That's enough to rebuild
the loop tree on the reader side. Stream -1 for an unused
loop entry. Write everything copy_loop_info copies.
References lto_get_section_name().
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Output landing pad LP to OB.
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Output EH region R in function FN to OB. CURR_RN is the slot index that is being emitted in FN->EH->REGION_ARRAY. This is used to detect EH region sharing.
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Output the existing eh_table to OB.
Emit the index of the root of the EH region tree.
Emit all the EH regions in the region array.
Emit all landing pads.
Emit all the runtime type data.
Emit the table of action chains.
The LTO_null either terminates the record or indicates that there
are no eh_records at all.
References output_block::cfg_stream, cfun, edge_def::count, edge_def::dest, edge_def::flags, get_loop(), basic_block_def::index, output_block::main_stream, basic_block_def::next_bb, number_of_loops(), edge_def::probability, PROFILE_LAST, streamer_write_gcov_count(), streamer_write_hwi(), streamer_write_uhwi(), and basic_block_def::succs.
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Output to OB a list of try/catch handlers starting with FIRST.
References eh_landing_pad_d::index, eh_region_d::index, LTO_eh_landing_pad, LTO_null, eh_landing_pad_d::next_lp, eh_landing_pad_d::region, streamer_write_hwi(), streamer_write_record_start(), and streamer_write_zero().
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Output the body of function NODE->DECL.
Set current_function_decl and cfun.
Make string 0 be a NULL string.
Output decls for parameters and args.
Output DECL_INITIAL for the function, which contains the tree of
lexical scopes. We also stream abstract functions where we stream only stuff needed for
debug info. Output all the SSA names used in the function.
Output any exception handling regions.
We will renumber the statements. The code that does this uses
the same ordering that we use for serializing them so we can use
the same code on the other end and not have to write out the
statement numbers. We do not assign UIDs to PHIs here because
virtual PHIs get re-computed on-the-fly which would make numbers
inconsistent. Virtual PHIs are not going to be streamed.
To avoid keeping duplicate gimple IDs in the statements, renumber
virtual phis now. Output the code for the function.
The terminator for this function.
Create a section to hold the pickled output of this function.
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Output all of the active ssa names to the ssa_names stream.
??? This drops SSA_NAME_IDENTIFIER on the floor.
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Output the base body of struct function FN using output block OB.
Output the static chain and non-local goto save area.
Output all the local variables in the function.
Output current IL state of the function.
Write all the attributes for FN.
Output the function start and end loci.
| bool output_symbol_p | ( | ) |
Return true if NODE should appear in the plugin symbol table.
We keep external functions in symtab for sake of inlining
and devirtualization. We do not want to see them in symbol table as
references unless they are really used. Ignore all references from external vars initializers - they are not really
part of the compilation unit until they are used by folding. Some symbols,
like references to external construction vtables can not be referred to at all.
We decide this at can_refer_decl_in_current_unit_p.
Referenced by write_symbol().
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Look up NODE in the type table and write the index for it to OB.
| void produce_asm | ( | ) |
Create the header in the file using OB. If the section type is for a function, set FN to the decl for that function.
The entire header is stream computed here.
Write the header.
Put all of the gimple and the string table out the asm file as a
block of text.
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This pass is run after all of the functions are serialized and all of the IPA passes have written their serialized forms. This pass causes the vector of all of the global decls and types used from this file to be written in to a section that can then be read in to recover these on other side.
Make string 0 be a NULL string.
Write the global symbols.
Currently not used. This field would allow us to preallocate
the globals vector, so that it need not be resized as it is extended. Compute the total size of all decl out states.
Write the main out-decl state, followed by out-decl states of
functions. Write the symbol table. It is used by linker to determine dependencies
and thus we can skip it for WPA. Write command line opts.
Deallocate memory and clean up.
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Write an IL symbol table to OB. SET and VSET are cgraph/varpool node sets we are outputting.
Write the symbol table.
First write everything defined and then all declarations.
This is necessary to handle cases where we have duplicated symbols.
References IPA_PASS.
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Compare two SCC entries by their hash value for qsorting them.
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Return true if tree node T is written to various tables. For these nodes, we sometimes want to write their phyiscal representation (via lto_output_tree), and sometimes we need to emit an index reference into a table (via lto_output_tree_ref).
Parameters and return values of functions of variably modified types
must go to global stream, because they may be used in the type
definition. Variably modified types need to be streamed alongside function
bodies because they can refer to local entities. Together with
them we have to localize their members as well.
??? In theory that includes non-FIELD_DECLs as well.
Referenced by lto_write_tree().
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Write a sequence of indices into the globals vector corresponding to the trees in ENCODER. These are used by the reader to map the indices used to refer to global entities within function bodies to their referents.
Write size as 32-bit unsigned.
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Write each node in encoded by ENCODER to OB, as well as those reachable from it and required for correct representation of its semantics. Each node in ENCODER must be a global declaration or a type. A node is written only once, even if it appears multiple times in the vector. Certain transitively-reachable nodes, such as those representing expressions, may be duplicated, but such nodes must not appear in ENCODER itself.
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Write symbol T into STREAM in CACHE. SEEN specifies symbols we wrote so far.
None of the following kinds of symbols are needed in the
symbol table. This behaves like assemble_name_raw in varasm.c, performing the
same name manipulations that ASM_OUTPUT_LABELREF does. When something is defined, it should have node attached.
Imitate what default_elf_asm_output_external do.
When symbol is external, we need to output it with DEFAULT visibility
when compiling with -fvisibility=default, while with HIDDEN visibility
when symbol has attribute (visibility("hidden")) specified.
targetm.binds_local_p check DECL_VISIBILITY_SPECIFIED and gets this
right.
References symtab_node_base::decl, output_block::decl_state, free(), lsei_end_p(), lsei_next(), lsei_node(), lsei_start(), lto_begin_section(), lto_end_section(), lto_get_section_name(), LTO_section_symtab, lto_write_stream(), memset(), output_symbol_p(), pointer_set_create(), pointer_set_destroy(), lto_out_decl_state::symtab_node_encoder, and output_block::writer_cache.
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Referenced by hash_scc().
1.8.1.1