| /* Data structures and declarations used for reading and writing |
| GIMPLE to a file stream. |
| |
| Copyright (C) 2009, 2010 Free Software Foundation, Inc. |
| Contributed by Doug Kwan <dougkwan@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/>. */ |
| |
| #ifndef GCC_LTO_STREAMER_H |
| #define GCC_LTO_STREAMER_H |
| |
| #include "plugin-api.h" |
| #include "tree.h" |
| #include "gimple.h" |
| #include "target.h" |
| #include "cgraph.h" |
| #include "vec.h" |
| #include "vecprim.h" |
| #include "alloc-pool.h" |
| #include "gcov-io.h" |
| |
| /* Define when debugging the LTO streamer. This causes the writer |
| to output the numeric value for the memory address of the tree node |
| being emitted. When debugging a problem in the reader, check the |
| original address that the writer was emitting using lto_orig_address_get. |
| With this value, set a breakpoint in the writer (e.g., lto_output_tree) |
| to trace how the faulty node is being emitted. */ |
| /* #define LTO_STREAMER_DEBUG 1 */ |
| |
| /* The encoding for a function consists of the following sections: |
| |
| 1) The header. |
| 2) FIELD_DECLS. |
| 3) FUNCTION_DECLS. |
| 4) global VAR_DECLS. |
| 5) type_decls |
| 6) types. |
| 7) Names for the labels that have names |
| 8) The SSA names. |
| 9) The control flow graph. |
| 10-11)Gimple for local decls. |
| 12) Gimple for the function. |
| 13) Strings. |
| |
| 1) THE HEADER. |
| 2-6) THE GLOBAL DECLS AND TYPES. |
| |
| The global decls and types are encoded in the same way. For each |
| entry, there is word with the offset within the section to the |
| entry. |
| |
| 7) THE LABEL NAMES. |
| |
| Since most labels do not have names, this section my be of zero |
| length. It consists of an array of string table references, one |
| per label. In the lto code, the labels are given either |
| positive or negative indexes. the positive ones have names and |
| the negative ones do not. The positive index can be used to |
| find the name in this array. |
| |
| 9) THE CFG. |
| |
| 10) Index into the local decls. Since local decls can have local |
| decls inside them, they must be read in randomly in order to |
| properly restore them. |
| |
| 11-12) GIMPLE FOR THE LOCAL DECLS AND THE FUNCTION BODY. |
| |
| The gimple consists of a set of records. |
| |
| THE FUNCTION |
| |
| At the top level of (8) is the function. It consists of five |
| pieces: |
| |
| LTO_function - The tag. |
| eh tree - This is all of the exception handling regions |
| put out in a post order traversial of the |
| tree. Siblings are output as lists terminated |
| by a 0. The set of fields matches the fields |
| defined in except.c. |
| |
| last_basic_block - in uleb128 form. |
| |
| basic blocks - This is the set of basic blocks. |
| |
| zero - The termination of the basic blocks. |
| |
| BASIC BLOCKS |
| |
| There are two forms of basic blocks depending on if they are |
| empty or not. |
| |
| The basic block consists of: |
| |
| LTO_bb1 or LTO_bb0 - The tag. |
| |
| bb->index - the index in uleb128 form. |
| |
| #succs - The number of successors un uleb128 form. |
| |
| the successors - For each edge, a pair. The first of the |
| pair is the index of the successor in |
| uleb128 form and the second are the flags in |
| uleb128 form. |
| |
| the statements - A gimple tree, as described above. |
| These are only present for LTO_BB1. |
| Following each statement is an optional |
| exception handling record LTO_eh_region |
| which contains the region number (for |
| regions >= 0). |
| |
| zero - This is only present for LTO_BB1 and is used |
| to terminate the statements and exception |
| regions within this block. |
| |
| 12) STRINGS |
| |
| String are represented in the table as pairs, a length in ULEB128 |
| form followed by the data for the string. */ |
| |
| /* The string that is the prefix on the section names we make for lto. |
| For decls the DECL_ASSEMBLER_NAME is appended to make the section |
| name for the functions and static_initializers. For other types of |
| sections a '.' and the section type are appended. */ |
| #define LTO_SECTION_NAME_PREFIX ".gnu.lto_" |
| |
| #define LTO_major_version 2 |
| #define LTO_minor_version 0 |
| |
| typedef unsigned char lto_decl_flags_t; |
| |
| |
| /* Data structures used to pack values and bitflags into a vector of |
| words. Used to stream values of a fixed number of bits in a space |
| efficient way. */ |
| static unsigned const BITS_PER_BITPACK_WORD = HOST_BITS_PER_WIDE_INT; |
| |
| typedef unsigned HOST_WIDE_INT bitpack_word_t; |
| DEF_VEC_I(bitpack_word_t); |
| DEF_VEC_ALLOC_I(bitpack_word_t, heap); |
| |
| struct bitpack_d |
| { |
| /* The position of the first unused or unconsumed bit in the word. */ |
| unsigned pos; |
| |
| /* The current word we are (un)packing. */ |
| bitpack_word_t word; |
| |
| /* The lto_output_stream or the lto_input_block we are streaming to/from. */ |
| void *stream; |
| }; |
| |
| /* Tags representing the various IL objects written to the bytecode file |
| (GIMPLE statements, basic blocks, EH regions, tree nodes, etc). |
| |
| NOTE, when adding new LTO tags, also update lto_tag_name. */ |
| enum LTO_tags |
| { |
| LTO_null = 0, |
| |
| /* Reserve enough entries to fit all the tree and gimple codes handled |
| by the streamer. This guarantees that: |
| |
| 1- Given a tree code C: |
| enum LTO_tags tag == C + 1 |
| |
| 2- Given a gimple code C: |
| enum LTO_tags tag == C + NUM_TREE_CODES + 1 |
| |
| Conversely, to map between LTO tags and tree/gimple codes, the |
| reverse operation must be applied. */ |
| LTO_bb0 = 1 + NUM_TREE_CODES + LAST_AND_UNUSED_GIMPLE_CODE, |
| LTO_bb1, |
| |
| /* EH region holding the previous statement. */ |
| LTO_eh_region, |
| |
| /* An MD or NORMAL builtin. Only the code and class are streamed out. */ |
| LTO_builtin_decl, |
| |
| /* Function body. */ |
| LTO_function, |
| |
| /* EH table. */ |
| LTO_eh_table, |
| |
| /* EH region types. These mirror enum eh_region_type. */ |
| LTO_ert_cleanup, |
| LTO_ert_try, |
| LTO_ert_allowed_exceptions, |
| LTO_ert_must_not_throw, |
| |
| /* EH landing pad. */ |
| LTO_eh_landing_pad, |
| |
| /* EH try/catch node. */ |
| LTO_eh_catch, |
| |
| /* Special for global streamer. Reference to previously-streamed node. */ |
| LTO_tree_pickle_reference, |
| |
| /* References to indexable tree nodes. These objects are stored in |
| tables that are written separately from the function bodies that |
| reference them. This way they can be instantiated even when the |
| referencing functions aren't (e.g., during WPA) and it also allows |
| functions to be copied from one file to another without having |
| to unpickle the body first (the references are location |
| independent). |
| |
| NOTE, do not regroup these values as the grouping is exposed |
| in the range checks done in lto_input_tree. */ |
| LTO_field_decl_ref, /* Do not change. */ |
| LTO_function_decl_ref, |
| LTO_label_decl_ref, |
| LTO_namespace_decl_ref, |
| LTO_result_decl_ref, |
| LTO_ssa_name_ref, |
| LTO_type_decl_ref, |
| LTO_type_ref, |
| LTO_const_decl_ref, |
| LTO_imported_decl_ref, |
| LTO_translation_unit_decl_ref, |
| LTO_global_decl_ref, /* Do not change. */ |
| |
| /* This tag must always be last. */ |
| LTO_NUM_TAGS |
| }; |
| |
| |
| /* Set of section types that are in an LTO file. This list will grow |
| as the number of IPA passes grows since each IPA pass will need its |
| own section type to store its summary information. |
| |
| When adding a new section type, you must also extend the |
| LTO_SECTION_NAME array in lto-section-in.c. */ |
| enum lto_section_type |
| { |
| LTO_section_decls = 0, |
| LTO_section_function_body, |
| LTO_section_static_initializer, |
| LTO_section_cgraph, |
| LTO_section_varpool, |
| LTO_section_refs, |
| LTO_section_jump_functions, |
| LTO_section_ipa_pure_const, |
| LTO_section_ipa_reference, |
| LTO_section_symtab, |
| LTO_section_opts, |
| LTO_section_cgraph_opt_sum, |
| LTO_N_SECTION_TYPES /* Must be last. */ |
| }; |
| |
| /* Indices to the various function, type and symbol streams. */ |
| typedef enum |
| { |
| LTO_DECL_STREAM_TYPE = 0, /* Must be first. */ |
| LTO_DECL_STREAM_FIELD_DECL, |
| LTO_DECL_STREAM_FN_DECL, |
| LTO_DECL_STREAM_VAR_DECL, |
| LTO_DECL_STREAM_TYPE_DECL, |
| LTO_DECL_STREAM_NAMESPACE_DECL, |
| LTO_DECL_STREAM_LABEL_DECL, |
| LTO_N_DECL_STREAMS |
| } lto_decl_stream_e_t; |
| |
| typedef enum ld_plugin_symbol_resolution ld_plugin_symbol_resolution_t; |
| DEF_VEC_I(ld_plugin_symbol_resolution_t); |
| DEF_VEC_ALLOC_I(ld_plugin_symbol_resolution_t, heap); |
| |
| |
| /* Macro to define convenience functions for type and decl streams |
| in lto_file_decl_data. */ |
| #define DEFINE_DECL_STREAM_FUNCS(UPPER_NAME, name) \ |
| static inline tree \ |
| lto_file_decl_data_get_ ## name (struct lto_file_decl_data *data, \ |
| unsigned int idx) \ |
| { \ |
| struct lto_in_decl_state *state = data->current_decl_state; \ |
| gcc_assert (idx < state->streams[LTO_DECL_STREAM_## UPPER_NAME].size); \ |
| return state->streams[LTO_DECL_STREAM_## UPPER_NAME].trees[idx]; \ |
| } \ |
| \ |
| static inline unsigned int \ |
| lto_file_decl_data_num_ ## name ## s (struct lto_file_decl_data *data) \ |
| { \ |
| struct lto_in_decl_state *state = data->current_decl_state; \ |
| return state->streams[LTO_DECL_STREAM_## UPPER_NAME].size; \ |
| } |
| |
| |
| /* Return a char pointer to the start of a data stream for an lto pass |
| or function. The first parameter is the file data that contains |
| the information. The second parameter is the type of information |
| to be obtained. The third parameter is the name of the function |
| and is only used when finding a function body; otherwise it is |
| NULL. The fourth parameter is the length of the data returned. */ |
| typedef const char* (lto_get_section_data_f) (struct lto_file_decl_data *, |
| enum lto_section_type, |
| const char *, |
| size_t *); |
| |
| /* Return the data found from the above call. The first three |
| parameters are the same as above. The fourth parameter is the data |
| itself and the fifth is the lenght of the data. */ |
| typedef void (lto_free_section_data_f) (struct lto_file_decl_data *, |
| enum lto_section_type, |
| const char *, |
| const char *, |
| size_t); |
| |
| /* Cache of pickled nodes. Used to avoid writing the same node more |
| than once. The first time a tree node is streamed out, it is |
| entered in this cache. Subsequent references to the same node are |
| resolved by looking it up in this cache. |
| |
| This is used in two ways: |
| |
| - On the writing side, the first time T is added to STREAMER_CACHE, |
| a new reference index is created for T and T is emitted on the |
| stream. If T needs to be emitted again to the stream, instead of |
| pickling it again, the reference index is emitted. |
| |
| - On the reading side, the first time T is read from the stream, it |
| is reconstructed in memory and a new reference index created for |
| T. The reconstructed T is inserted in some array so that when |
| the reference index for T is found in the input stream, it can be |
| used to look up into the array to get the reconstructed T. */ |
| struct lto_streamer_cache_d |
| { |
| /* The mapping between tree nodes and slots into the nodes array. */ |
| htab_t node_map; |
| |
| /* Node map to store entries into. */ |
| alloc_pool node_map_entries; |
| |
| /* Next available slot in the nodes and offsets arrays. */ |
| unsigned next_slot; |
| |
| /* The nodes pickled so far. */ |
| VEC(tree,heap) *nodes; |
| |
| /* Offset into the stream where the nodes have been written. */ |
| VEC(unsigned,heap) *offsets; |
| }; |
| |
| |
| /* Structure used as buffer for reading an LTO file. */ |
| struct lto_input_block |
| { |
| const char *data; |
| unsigned int p; |
| unsigned int len; |
| }; |
| |
| #define LTO_INIT_INPUT_BLOCK(BASE,D,P,L) \ |
| do { \ |
| BASE.data = D; \ |
| BASE.p = P; \ |
| BASE.len = L; \ |
| } while (0) |
| |
| #define LTO_INIT_INPUT_BLOCK_PTR(BASE,D,P,L) \ |
| do { \ |
| BASE->data = D; \ |
| BASE->p = P; \ |
| BASE->len = L; \ |
| } while (0) |
| |
| |
| /* The is the first part of the record for a function or constructor |
| in the .o file. */ |
| struct lto_header |
| { |
| int16_t major_version; |
| int16_t minor_version; |
| enum lto_section_type section_type; |
| }; |
| |
| /* The header for a function body. */ |
| struct lto_function_header |
| { |
| /* The header for all types of sections. */ |
| struct lto_header lto_header; |
| |
| /* Number of labels with names. */ |
| int32_t num_named_labels; |
| |
| /* Number of labels without names. */ |
| int32_t num_unnamed_labels; |
| |
| /* Size compressed or 0 if not compressed. */ |
| int32_t compressed_size; |
| |
| /* Size of names for named labels. */ |
| int32_t named_label_size; |
| |
| /* Size of the cfg. */ |
| int32_t cfg_size; |
| |
| /* Size of main gimple body of function. */ |
| int32_t main_size; |
| |
| /* Size of the string table. */ |
| int32_t string_size; |
| }; |
| |
| |
| /* Structure describing a symbol section. */ |
| struct lto_decl_header |
| { |
| /* The header for all types of sections. */ |
| struct lto_header lto_header; |
| |
| /* Size of region for decl state. */ |
| int32_t decl_state_size; |
| |
| /* Number of nodes in globals stream. */ |
| int32_t num_nodes; |
| |
| /* Size of region for expressions, decls, types, etc. */ |
| int32_t main_size; |
| |
| /* Size of the string table. */ |
| int32_t string_size; |
| }; |
| |
| |
| /* Statistics gathered during LTO, WPA and LTRANS. */ |
| struct lto_stats_d |
| { |
| unsigned HOST_WIDE_INT num_input_cgraph_nodes; |
| unsigned HOST_WIDE_INT num_output_cgraph_nodes; |
| unsigned HOST_WIDE_INT num_input_files; |
| unsigned HOST_WIDE_INT num_output_files; |
| unsigned HOST_WIDE_INT num_cgraph_partitions; |
| unsigned HOST_WIDE_INT section_size[LTO_N_SECTION_TYPES]; |
| unsigned HOST_WIDE_INT num_function_bodies; |
| unsigned HOST_WIDE_INT num_trees[NUM_TREE_CODES]; |
| unsigned HOST_WIDE_INT num_output_il_bytes; |
| unsigned HOST_WIDE_INT num_compressed_il_bytes; |
| unsigned HOST_WIDE_INT num_input_il_bytes; |
| unsigned HOST_WIDE_INT num_uncompressed_il_bytes; |
| }; |
| |
| /* Encoder data structure used to stream callgraph nodes. */ |
| struct lto_cgraph_encoder_d |
| { |
| /* Map nodes to reference number. */ |
| struct pointer_map_t *map; |
| |
| /* Map reference number to node. */ |
| VEC(cgraph_node_ptr,heap) *nodes; |
| |
| /* Map of nodes where we want to output body. */ |
| struct pointer_set_t *body; |
| }; |
| |
| typedef struct lto_cgraph_encoder_d *lto_cgraph_encoder_t; |
| |
| /* Return number of encoded nodes in ENCODER. */ |
| |
| static inline int |
| lto_cgraph_encoder_size (lto_cgraph_encoder_t encoder) |
| { |
| return VEC_length (cgraph_node_ptr, encoder->nodes); |
| } |
| |
| |
| /* Encoder data structure used to stream callgraph nodes. */ |
| struct lto_varpool_encoder_d |
| { |
| /* Map nodes to reference number. */ |
| struct pointer_map_t *map; |
| |
| /* Map reference number to node. */ |
| VEC(varpool_node_ptr,heap) *nodes; |
| |
| /* Map of nodes where we want to output initializer. */ |
| struct pointer_set_t *initializer; |
| }; |
| typedef struct lto_varpool_encoder_d *lto_varpool_encoder_t; |
| |
| /* Return number of encoded nodes in ENCODER. */ |
| |
| static inline int |
| lto_varpool_encoder_size (lto_varpool_encoder_t encoder) |
| { |
| return VEC_length (varpool_node_ptr, encoder->nodes); |
| } |
| |
| /* Mapping from indices to trees. */ |
| struct GTY(()) lto_tree_ref_table |
| { |
| /* Array of referenced trees . */ |
| tree * GTY((length ("%h.size"))) trees; |
| |
| /* Size of array. */ |
| unsigned int size; |
| }; |
| |
| |
| /* Mapping between trees and slots in an array. */ |
| struct lto_decl_slot |
| { |
| tree t; |
| int slot_num; |
| }; |
| |
| |
| /* The lto_tree_ref_encoder struct is used to encode trees into indices. */ |
| |
| struct lto_tree_ref_encoder |
| { |
| htab_t tree_hash_table; /* Maps pointers to indices. */ |
| unsigned int next_index; /* Next available index. */ |
| VEC(tree,heap) *trees; /* Maps indices to pointers. */ |
| }; |
| |
| |
| /* Structure to hold states of input scope. */ |
| struct GTY(()) lto_in_decl_state |
| { |
| /* Array of lto_in_decl_buffers to store type and decls streams. */ |
| struct lto_tree_ref_table streams[LTO_N_DECL_STREAMS]; |
| |
| /* If this in-decl state is associated with a function. FN_DECL |
| point to the FUNCTION_DECL. */ |
| tree fn_decl; |
| }; |
| |
| typedef struct lto_in_decl_state *lto_in_decl_state_ptr; |
| |
| |
| /* The structure that holds all of the vectors of global types, |
| decls and cgraph nodes used in the serialization of this file. */ |
| struct lto_out_decl_state |
| { |
| /* The buffers contain the sets of decls of various kinds and types we have |
| seen so far and the indexes assigned to them. */ |
| struct lto_tree_ref_encoder streams[LTO_N_DECL_STREAMS]; |
| |
| /* Encoder for cgraph nodes. */ |
| lto_cgraph_encoder_t cgraph_node_encoder; |
| |
| /* Encoder for varpool nodes. */ |
| lto_varpool_encoder_t varpool_node_encoder; |
| |
| /* If this out-decl state belongs to a function, fn_decl points to that |
| function. Otherwise, it is NULL. */ |
| tree fn_decl; |
| }; |
| |
| typedef struct lto_out_decl_state *lto_out_decl_state_ptr; |
| |
| DEF_VEC_P(lto_out_decl_state_ptr); |
| DEF_VEC_ALLOC_P(lto_out_decl_state_ptr, heap); |
| |
| /* One of these is allocated for each object file that being compiled |
| by lto. This structure contains the tables that are needed by the |
| serialized functions and ipa passes to connect themselves to the |
| global types and decls as they are reconstituted. */ |
| struct GTY(()) lto_file_decl_data |
| { |
| /* Decl state currently used. */ |
| struct lto_in_decl_state *current_decl_state; |
| |
| /* Decl state corresponding to regions outside of any functions |
| in the compilation unit. */ |
| struct lto_in_decl_state *global_decl_state; |
| |
| /* Table of cgraph nodes present in this file. */ |
| lto_cgraph_encoder_t GTY((skip)) cgraph_node_encoder; |
| |
| /* Table of varpool nodes present in this file. */ |
| lto_varpool_encoder_t GTY((skip)) varpool_node_encoder; |
| |
| /* Hash table maps lto-related section names to location in file. */ |
| htab_t GTY((param_is (struct lto_in_decl_state))) function_decl_states; |
| |
| /* The .o file that these offsets relate to. */ |
| const char *GTY((skip)) file_name; |
| |
| /* Hash table maps lto-related section names to location in file. */ |
| htab_t GTY((skip)) section_hash_table; |
| |
| /* Hash new name of renamed global declaration to its original name. */ |
| htab_t GTY((skip)) renaming_hash_table; |
| |
| /* Linked list used temporarily in reader */ |
| struct lto_file_decl_data *next; |
| |
| /* Sub ID for merged objects. */ |
| unsigned id; |
| |
| /* Symbol resolutions for this file */ |
| VEC(ld_plugin_symbol_resolution_t,heap) * GTY((skip)) resolutions; |
| |
| struct gcov_ctr_summary GTY((skip)) profile_info; |
| }; |
| |
| typedef struct lto_file_decl_data *lto_file_decl_data_ptr; |
| |
| struct lto_char_ptr_base |
| { |
| char *ptr; |
| }; |
| |
| /* An incore byte stream to buffer the various parts of the function. |
| The entire structure should be zeroed when created. The record |
| consists of a set of blocks. The first sizeof (ptr) bytes are used |
| as a chain, and the rest store the bytes to be written. */ |
| struct lto_output_stream |
| { |
| /* The pointer to the first block in the stream. */ |
| struct lto_char_ptr_base * first_block; |
| |
| /* The pointer to the last and current block in the stream. */ |
| struct lto_char_ptr_base * current_block; |
| |
| /* The pointer to where the next char should be written. */ |
| char * current_pointer; |
| |
| /* The number of characters left in the current block. */ |
| unsigned int left_in_block; |
| |
| /* The block size of the last block allocated. */ |
| unsigned int block_size; |
| |
| /* The total number of characters written. */ |
| unsigned int total_size; |
| }; |
| |
| /* The is the first part of the record in an LTO file for many of the |
| IPA passes. */ |
| struct lto_simple_header |
| { |
| /* The header for all types of sections. */ |
| struct lto_header lto_header; |
| |
| /* Size of main gimple body of function. */ |
| int32_t main_size; |
| |
| /* Size of main stream when compressed. */ |
| int32_t compressed_size; |
| }; |
| |
| /* A simple output block. This can be used for simple IPA passes that |
| do not need more than one stream. */ |
| struct lto_simple_output_block |
| { |
| enum lto_section_type section_type; |
| struct lto_out_decl_state *decl_state; |
| |
| /* The stream that the main tree codes are written to. */ |
| struct lto_output_stream *main_stream; |
| }; |
| |
| /* Data structure holding all the data and descriptors used when writing |
| an LTO file. */ |
| struct output_block |
| { |
| enum lto_section_type section_type; |
| struct lto_out_decl_state *decl_state; |
| |
| /* The stream that the main tree codes are written to. */ |
| struct lto_output_stream *main_stream; |
| |
| /* The stream that contains the string table. */ |
| struct lto_output_stream *string_stream; |
| |
| /* The stream that contains the cfg. */ |
| struct lto_output_stream *cfg_stream; |
| |
| /* The hash table that contains the set of strings we have seen so |
| far and the indexes assigned to them. */ |
| htab_t string_hash_table; |
| |
| /* The current cgraph_node that we are currently serializing. Null |
| if we are serializing something else. */ |
| struct cgraph_node *cgraph_node; |
| |
| /* These are the last file and line that were seen in the stream. |
| If the current node differs from these, it needs to insert |
| something into the stream and fix these up. */ |
| const char *current_file; |
| int current_line; |
| int current_col; |
| |
| /* True if writing globals and types. */ |
| bool global; |
| |
| /* Cache of nodes written in this section. */ |
| struct lto_streamer_cache_d *writer_cache; |
| }; |
| |
| |
| /* Data and descriptors used when reading from an LTO file. */ |
| struct data_in |
| { |
| /* The global decls and types. */ |
| struct lto_file_decl_data *file_data; |
| |
| /* All of the labels. */ |
| tree *labels; |
| |
| /* The string table. */ |
| const char *strings; |
| |
| /* The length of the string table. */ |
| unsigned int strings_len; |
| |
| /* Number of named labels. Used to find the index of unnamed labels |
| since they share space with the named labels. */ |
| unsigned int num_named_labels; |
| |
| /* Number of unnamed labels. */ |
| unsigned int num_unnamed_labels; |
| |
| const char *current_file; |
| int current_line; |
| int current_col; |
| |
| /* Maps each reference number to the resolution done by the linker. */ |
| VEC(ld_plugin_symbol_resolution_t,heap) *globals_resolution; |
| |
| /* Cache of pickled nodes. */ |
| struct lto_streamer_cache_d *reader_cache; |
| }; |
| |
| |
| /* In lto-section-in.c */ |
| extern struct lto_input_block * lto_create_simple_input_block ( |
| struct lto_file_decl_data *, |
| enum lto_section_type, const char **, size_t *); |
| extern void |
| lto_destroy_simple_input_block (struct lto_file_decl_data *, |
| enum lto_section_type, |
| struct lto_input_block *, const char *, size_t); |
| extern void lto_set_in_hooks (struct lto_file_decl_data **, |
| lto_get_section_data_f *, |
| lto_free_section_data_f *); |
| extern struct lto_file_decl_data **lto_get_file_decl_data (void); |
| extern const char *lto_get_section_data (struct lto_file_decl_data *, |
| enum lto_section_type, |
| const char *, size_t *); |
| extern void lto_free_section_data (struct lto_file_decl_data *, |
| enum lto_section_type, |
| const char *, const char *, size_t); |
| extern unsigned char lto_input_1_unsigned (struct lto_input_block *); |
| extern unsigned HOST_WIDE_INT lto_input_uleb128 (struct lto_input_block *); |
| extern unsigned HOST_WIDEST_INT lto_input_widest_uint_uleb128 ( |
| struct lto_input_block *); |
| extern HOST_WIDE_INT lto_input_sleb128 (struct lto_input_block *); |
| extern htab_t lto_create_renaming_table (void); |
| extern void lto_record_renamed_decl (struct lto_file_decl_data *, |
| const char *, const char *); |
| extern const char *lto_get_decl_name_mapping (struct lto_file_decl_data *, |
| const char *); |
| extern struct lto_in_decl_state *lto_new_in_decl_state (void); |
| extern void lto_delete_in_decl_state (struct lto_in_decl_state *); |
| extern hashval_t lto_hash_in_decl_state (const void *); |
| extern int lto_eq_in_decl_state (const void *, const void *); |
| extern struct lto_in_decl_state *lto_get_function_in_decl_state ( |
| struct lto_file_decl_data *, tree); |
| |
| /* In lto-section-out.c */ |
| extern hashval_t lto_hash_decl_slot_node (const void *); |
| extern int lto_eq_decl_slot_node (const void *, const void *); |
| extern hashval_t lto_hash_type_slot_node (const void *); |
| extern int lto_eq_type_slot_node (const void *, const void *); |
| extern void lto_begin_section (const char *, bool); |
| extern void lto_end_section (void); |
| extern void lto_write_stream (struct lto_output_stream *); |
| extern void lto_output_1_stream (struct lto_output_stream *, char); |
| extern void lto_output_data_stream (struct lto_output_stream *, const void *, |
| size_t); |
| extern void lto_output_uleb128_stream (struct lto_output_stream *, |
| unsigned HOST_WIDE_INT); |
| extern void lto_output_widest_uint_uleb128_stream (struct lto_output_stream *, |
| unsigned HOST_WIDEST_INT); |
| extern void lto_output_sleb128_stream (struct lto_output_stream *, |
| HOST_WIDE_INT); |
| extern bool lto_output_decl_index (struct lto_output_stream *, |
| struct lto_tree_ref_encoder *, |
| tree, unsigned int *); |
| extern void lto_output_field_decl_index (struct lto_out_decl_state *, |
| struct lto_output_stream *, tree); |
| extern void lto_output_fn_decl_index (struct lto_out_decl_state *, |
| struct lto_output_stream *, tree); |
| extern void lto_output_namespace_decl_index (struct lto_out_decl_state *, |
| struct lto_output_stream *, tree); |
| extern void lto_output_var_decl_index (struct lto_out_decl_state *, |
| struct lto_output_stream *, tree); |
| extern void lto_output_type_decl_index (struct lto_out_decl_state *, |
| struct lto_output_stream *, tree); |
| extern void lto_output_type_ref_index (struct lto_out_decl_state *, |
| struct lto_output_stream *, tree); |
| extern struct lto_simple_output_block *lto_create_simple_output_block ( |
| enum lto_section_type); |
| extern void lto_destroy_simple_output_block (struct lto_simple_output_block *); |
| extern struct lto_out_decl_state *lto_new_out_decl_state (void); |
| extern void lto_delete_out_decl_state (struct lto_out_decl_state *); |
| extern struct lto_out_decl_state *lto_get_out_decl_state (void); |
| extern void lto_push_out_decl_state (struct lto_out_decl_state *); |
| extern struct lto_out_decl_state *lto_pop_out_decl_state (void); |
| extern void lto_record_function_out_decl_state (tree, |
| struct lto_out_decl_state *); |
| |
| |
| /* In lto-streamer.c. */ |
| extern const char *lto_tag_name (enum LTO_tags); |
| extern bitmap lto_bitmap_alloc (void); |
| extern void lto_bitmap_free (bitmap); |
| extern char *lto_get_section_name (int, const char *, struct lto_file_decl_data *); |
| extern void print_lto_report (void); |
| extern bool lto_streamer_cache_insert (struct lto_streamer_cache_d *, tree, |
| int *, unsigned *); |
| extern bool lto_streamer_cache_insert_at (struct lto_streamer_cache_d *, tree, |
| int); |
| extern bool lto_streamer_cache_lookup (struct lto_streamer_cache_d *, tree, |
| int *); |
| extern tree lto_streamer_cache_get (struct lto_streamer_cache_d *, int); |
| extern struct lto_streamer_cache_d *lto_streamer_cache_create (void); |
| extern void lto_streamer_cache_delete (struct lto_streamer_cache_d *); |
| extern void lto_streamer_init (void); |
| extern bool gate_lto_out (void); |
| #ifdef LTO_STREAMER_DEBUG |
| extern void lto_orig_address_map (tree, intptr_t); |
| extern intptr_t lto_orig_address_get (tree); |
| extern void lto_orig_address_remove (tree); |
| #endif |
| extern void lto_check_version (int, int); |
| |
| |
| /* In lto-streamer-in.c */ |
| extern void lto_input_cgraph (struct lto_file_decl_data *, const char *); |
| extern void lto_init_reader (void); |
| extern tree lto_input_tree (struct lto_input_block *, struct data_in *); |
| extern void lto_input_function_body (struct lto_file_decl_data *, tree, |
| const char *); |
| extern void lto_input_constructors_and_inits (struct lto_file_decl_data *, |
| const char *); |
| extern void lto_init_reader (void); |
| extern struct data_in *lto_data_in_create (struct lto_file_decl_data *, |
| const char *, unsigned, |
| VEC(ld_plugin_symbol_resolution_t,heap) *); |
| extern void lto_data_in_delete (struct data_in *); |
| |
| |
| /* In lto-streamer-out.c */ |
| extern void lto_register_decl_definition (tree, struct lto_file_decl_data *); |
| extern struct output_block *create_output_block (enum lto_section_type); |
| extern void destroy_output_block (struct output_block *); |
| extern void lto_output_tree (struct output_block *, tree, bool); |
| extern void produce_asm (struct output_block *ob, tree fn); |
| |
| |
| /* In lto-cgraph.c */ |
| struct cgraph_node *lto_cgraph_encoder_deref (lto_cgraph_encoder_t, int); |
| int lto_cgraph_encoder_lookup (lto_cgraph_encoder_t, struct cgraph_node *); |
| lto_cgraph_encoder_t lto_cgraph_encoder_new (void); |
| int lto_cgraph_encoder_encode (lto_cgraph_encoder_t, struct cgraph_node *); |
| void lto_cgraph_encoder_delete (lto_cgraph_encoder_t); |
| bool lto_cgraph_encoder_encode_body_p (lto_cgraph_encoder_t, |
| struct cgraph_node *); |
| |
| bool lto_varpool_encoder_encode_body_p (lto_varpool_encoder_t, |
| struct varpool_node *); |
| struct varpool_node *lto_varpool_encoder_deref (lto_varpool_encoder_t, int); |
| int lto_varpool_encoder_lookup (lto_varpool_encoder_t, struct varpool_node *); |
| lto_varpool_encoder_t lto_varpool_encoder_new (void); |
| int lto_varpool_encoder_encode (lto_varpool_encoder_t, struct varpool_node *); |
| void lto_varpool_encoder_delete (lto_varpool_encoder_t); |
| bool lto_varpool_encoder_encode_initializer_p (lto_varpool_encoder_t, |
| struct varpool_node *); |
| void output_cgraph (cgraph_node_set, varpool_node_set); |
| void input_cgraph (void); |
| bool referenced_from_other_partition_p (struct ipa_ref_list *, |
| cgraph_node_set, |
| varpool_node_set vset); |
| bool reachable_from_other_partition_p (struct cgraph_node *, |
| cgraph_node_set); |
| bool referenced_from_this_partition_p (struct ipa_ref_list *, |
| cgraph_node_set, |
| varpool_node_set vset); |
| bool reachable_from_this_partition_p (struct cgraph_node *, |
| cgraph_node_set); |
| void compute_ltrans_boundary (struct lto_out_decl_state *state, |
| cgraph_node_set, varpool_node_set); |
| |
| |
| /* In lto-symtab.c. */ |
| extern void lto_symtab_register_decl (tree, ld_plugin_symbol_resolution_t, |
| struct lto_file_decl_data *); |
| extern void lto_symtab_merge_decls (void); |
| extern void lto_symtab_merge_cgraph_nodes (void); |
| extern tree lto_symtab_prevailing_decl (tree decl); |
| extern enum ld_plugin_symbol_resolution lto_symtab_get_resolution (tree decl); |
| extern void lto_symtab_free (void); |
| extern GTY(()) VEC(tree,gc) *lto_global_var_decls; |
| |
| |
| /* In lto-opts.c. */ |
| extern void lto_register_user_option (size_t, const char *, int, int); |
| extern void lto_read_file_options (struct lto_file_decl_data *); |
| extern void lto_write_options (void); |
| extern void lto_reissue_options (void); |
| void lto_clear_user_options (void); |
| void lto_clear_file_options (void); |
| |
| |
| /* In lto-wpa-fixup.c */ |
| void lto_mark_nothrow_fndecl (tree); |
| void lto_fixup_nothrow_decls (void); |
| |
| |
| /* Statistics gathered during LTO, WPA and LTRANS. */ |
| extern struct lto_stats_d lto_stats; |
| |
| /* Section names corresponding to the values of enum lto_section_type. */ |
| extern const char *lto_section_name[]; |
| |
| /* Holds all the out decl states of functions output so far in the |
| current output file. */ |
| extern VEC(lto_out_decl_state_ptr, heap) *lto_function_decl_states; |
| |
| /* Return true if LTO tag TAG corresponds to a tree code. */ |
| static inline bool |
| lto_tag_is_tree_code_p (enum LTO_tags tag) |
| { |
| return tag > LTO_null && (unsigned) tag <= NUM_TREE_CODES; |
| } |
| |
| |
| /* Return true if LTO tag TAG corresponds to a gimple code. */ |
| static inline bool |
| lto_tag_is_gimple_code_p (enum LTO_tags tag) |
| { |
| return (unsigned) tag >= NUM_TREE_CODES + 1 |
| && (unsigned) tag < 1 + NUM_TREE_CODES + LAST_AND_UNUSED_GIMPLE_CODE; |
| } |
| |
| |
| /* Return the LTO tag corresponding to gimple code CODE. See enum |
| LTO_tags for details on the conversion. */ |
| static inline enum LTO_tags |
| lto_gimple_code_to_tag (enum gimple_code code) |
| { |
| return (enum LTO_tags) ((unsigned) code + NUM_TREE_CODES + 1); |
| } |
| |
| |
| /* Return the GIMPLE code corresponding to TAG. See enum LTO_tags for |
| details on the conversion. */ |
| static inline enum gimple_code |
| lto_tag_to_gimple_code (enum LTO_tags tag) |
| { |
| gcc_assert (lto_tag_is_gimple_code_p (tag)); |
| return (enum gimple_code) ((unsigned) tag - NUM_TREE_CODES - 1); |
| } |
| |
| |
| /* Return the LTO tag corresponding to tree code CODE. See enum |
| LTO_tags for details on the conversion. */ |
| static inline enum LTO_tags |
| lto_tree_code_to_tag (enum tree_code code) |
| { |
| return (enum LTO_tags) ((unsigned) code + 1); |
| } |
| |
| |
| /* Return the tree code corresponding to TAG. See enum LTO_tags for |
| details on the conversion. */ |
| static inline enum tree_code |
| lto_tag_to_tree_code (enum LTO_tags tag) |
| { |
| gcc_assert (lto_tag_is_tree_code_p (tag)); |
| return (enum tree_code) ((unsigned) tag - 1); |
| } |
| |
| /* Initialize an lto_out_decl_buffer ENCODER. */ |
| static inline void |
| lto_init_tree_ref_encoder (struct lto_tree_ref_encoder *encoder, |
| htab_hash hash_fn, htab_eq eq_fn) |
| { |
| encoder->tree_hash_table = htab_create (37, hash_fn, eq_fn, free); |
| encoder->next_index = 0; |
| encoder->trees = NULL; |
| } |
| |
| |
| /* Destory an lto_tree_ref_encoder ENCODER by freeing its contents. The |
| memory used by ENCODER is not freed by this function. */ |
| static inline void |
| lto_destroy_tree_ref_encoder (struct lto_tree_ref_encoder *encoder) |
| { |
| /* Hash table may be delete already. */ |
| if (encoder->tree_hash_table) |
| htab_delete (encoder->tree_hash_table); |
| VEC_free (tree, heap, encoder->trees); |
| } |
| |
| /* Return the number of trees encoded in ENCODER. */ |
| static inline unsigned int |
| lto_tree_ref_encoder_size (struct lto_tree_ref_encoder *encoder) |
| { |
| return VEC_length (tree, encoder->trees); |
| } |
| |
| /* Return the IDX-th tree in ENCODER. */ |
| static inline tree |
| lto_tree_ref_encoder_get_tree (struct lto_tree_ref_encoder *encoder, |
| unsigned int idx) |
| { |
| return VEC_index (tree, encoder->trees, idx); |
| } |
| |
| |
| /* Return true if LABEL should be emitted in the global context. */ |
| static inline bool |
| emit_label_in_global_context_p (tree label) |
| { |
| return DECL_NONLOCAL (label) || FORCED_LABEL (label); |
| } |
| |
| /* Return true if tree node EXPR should be streamed as a builtin. For |
| these nodes, we just emit the class and function code. */ |
| static inline bool |
| lto_stream_as_builtin_p (tree expr) |
| { |
| return (TREE_CODE (expr) == FUNCTION_DECL |
| && DECL_IS_BUILTIN (expr) |
| && (DECL_BUILT_IN_CLASS (expr) == BUILT_IN_NORMAL |
| || DECL_BUILT_IN_CLASS (expr) == BUILT_IN_MD)); |
| } |
| |
| /* Return true if EXPR is a tree node that can be written to disk. */ |
| static inline bool |
| lto_is_streamable (tree expr) |
| { |
| enum tree_code code = TREE_CODE (expr); |
| |
| /* Notice that we reject SSA_NAMEs as well. We only emit the SSA |
| name version in lto_output_tree_ref (see output_ssa_names). */ |
| return !is_lang_specific (expr) |
| && code != SSA_NAME |
| && code != CALL_EXPR |
| && code != LANG_TYPE |
| && code != MODIFY_EXPR |
| && code != INIT_EXPR |
| && code != TARGET_EXPR |
| && code != BIND_EXPR |
| && code != WITH_CLEANUP_EXPR |
| && code != STATEMENT_LIST |
| && (code == CASE_LABEL_EXPR |
| || code == DECL_EXPR |
| || TREE_CODE_CLASS (code) != tcc_statement); |
| } |
| |
| DEFINE_DECL_STREAM_FUNCS (TYPE, type) |
| DEFINE_DECL_STREAM_FUNCS (FIELD_DECL, field_decl) |
| DEFINE_DECL_STREAM_FUNCS (FN_DECL, fn_decl) |
| DEFINE_DECL_STREAM_FUNCS (VAR_DECL, var_decl) |
| DEFINE_DECL_STREAM_FUNCS (TYPE_DECL, type_decl) |
| DEFINE_DECL_STREAM_FUNCS (NAMESPACE_DECL, namespace_decl) |
| DEFINE_DECL_STREAM_FUNCS (LABEL_DECL, label_decl) |
| |
| /* Returns a new bit-packing context for bit-packing into S. */ |
| static inline struct bitpack_d |
| bitpack_create (struct lto_output_stream *s) |
| { |
| struct bitpack_d bp; |
| bp.pos = 0; |
| bp.word = 0; |
| bp.stream = (void *)s; |
| return bp; |
| } |
| |
| /* Pack the NBITS bit sized value VAL into the bit-packing context BP. */ |
| static inline void |
| bp_pack_value (struct bitpack_d *bp, bitpack_word_t val, unsigned nbits) |
| { |
| bitpack_word_t word = bp->word; |
| int pos = bp->pos; |
| /* If val does not fit into the current bitpack word switch to the |
| next one. */ |
| if (pos + nbits > BITS_PER_BITPACK_WORD) |
| { |
| lto_output_uleb128_stream ((struct lto_output_stream *) bp->stream, word); |
| word = val; |
| pos = nbits; |
| } |
| else |
| { |
| word |= val << pos; |
| pos += nbits; |
| } |
| bp->word = word; |
| bp->pos = pos; |
| } |
| |
| /* Finishes bit-packing of BP. */ |
| static inline void |
| lto_output_bitpack (struct bitpack_d *bp) |
| { |
| lto_output_uleb128_stream ((struct lto_output_stream *) bp->stream, |
| bp->word); |
| bp->word = 0; |
| bp->pos = 0; |
| } |
| |
| /* Returns a new bit-packing context for bit-unpacking from IB. */ |
| static inline struct bitpack_d |
| lto_input_bitpack (struct lto_input_block *ib) |
| { |
| struct bitpack_d bp; |
| bp.word = lto_input_uleb128 (ib); |
| bp.pos = 0; |
| bp.stream = (void *)ib; |
| return bp; |
| } |
| |
| /* Unpacks NBITS bits from the bit-packing context BP and returns them. */ |
| static inline bitpack_word_t |
| bp_unpack_value (struct bitpack_d *bp, unsigned nbits) |
| { |
| bitpack_word_t mask, val; |
| int pos = bp->pos; |
| |
| mask = (nbits == BITS_PER_BITPACK_WORD |
| ? (bitpack_word_t) -1 |
| : ((bitpack_word_t) 1 << nbits) - 1); |
| |
| /* If there are not continuous nbits in the current bitpack word |
| switch to the next one. */ |
| if (pos + nbits > BITS_PER_BITPACK_WORD) |
| { |
| bp->word = val = lto_input_uleb128 ((struct lto_input_block *)bp->stream); |
| bp->pos = nbits; |
| return val & mask; |
| } |
| val = bp->word; |
| val >>= pos; |
| bp->pos = pos + nbits; |
| |
| return val & mask; |
| } |
| |
| #endif /* GCC_LTO_STREAMER_H */ |