| /* Callgraph clones |
| Copyright (C) 2003-2013 Free Software Foundation, Inc. |
| Contributed by Jan Hubicka |
| |
| 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/>. */ |
| |
| /* This module provide facilities for clonning functions. I.e. creating |
| new functions based on existing functions with simple modifications, |
| such as replacement of parameters. |
| |
| To allow whole program optimization without actual presence of function |
| bodies, an additional infrastructure is provided for so-called virtual |
| clones |
| |
| A virtual clone in the callgraph is a function that has no |
| associated body, just a description of how to create its body based |
| on a different function (which itself may be a virtual clone). |
| |
| The description of function modifications includes adjustments to |
| the function's signature (which allows, for example, removing or |
| adding function arguments), substitutions to perform on the |
| function body, and, for inlined functions, a pointer to the |
| function that it will be inlined into. |
| |
| It is also possible to redirect any edge of the callgraph from a |
| function to its virtual clone. This implies updating of the call |
| site to adjust for the new function signature. |
| |
| Most of the transformations performed by inter-procedural |
| optimizations can be represented via virtual clones. For |
| instance, a constant propagation pass can produce a virtual clone |
| of the function which replaces one of its arguments by a |
| constant. The inliner can represent its decisions by producing a |
| clone of a function whose body will be later integrated into |
| a given function. |
| |
| Using virtual clones, the program can be easily updated |
| during the Execute stage, solving most of pass interactions |
| problems that would otherwise occur during Transform. |
| |
| Virtual clones are later materialized in the LTRANS stage and |
| turned into real functions. Passes executed after the virtual |
| clone were introduced also perform their Transform stage |
| on new functions, so for a pass there is no significant |
| difference between operating on a real function or a virtual |
| clone introduced before its Execute stage. |
| |
| Optimization passes then work on virtual clones introduced before |
| their Execute stage as if they were real functions. The |
| only difference is that clones are not visible during the |
| Generate Summary stage. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "tm.h" |
| #include "tree.h" |
| #include "rtl.h" |
| #include "tree-flow.h" |
| #include "tree-inline.h" |
| #include "langhooks.h" |
| #include "pointer-set.h" |
| #include "toplev.h" |
| #include "flags.h" |
| #include "ggc.h" |
| #include "debug.h" |
| #include "target.h" |
| #include "cgraph.h" |
| #include "diagnostic.h" |
| #include "params.h" |
| #include "intl.h" |
| #include "function.h" |
| #include "ipa-prop.h" |
| #include "gimple.h" |
| #include "tree-iterator.h" |
| #include "tree-dump.h" |
| #include "gimple-pretty-print.h" |
| #include "coverage.h" |
| #include "ipa-inline.h" |
| #include "ipa-utils.h" |
| #include "lto-streamer.h" |
| #include "except.h" |
| |
| /* Create clone of E in the node N represented by CALL_EXPR the callgraph. */ |
| struct cgraph_edge * |
| cgraph_clone_edge (struct cgraph_edge *e, struct cgraph_node *n, |
| gimple call_stmt, unsigned stmt_uid, gcov_type count_scale, |
| int freq_scale, bool update_original) |
| { |
| struct cgraph_edge *new_edge; |
| gcov_type count = e->count * count_scale / REG_BR_PROB_BASE; |
| gcov_type freq; |
| |
| /* We do not want to ignore loop nest after frequency drops to 0. */ |
| if (!freq_scale) |
| freq_scale = 1; |
| freq = e->frequency * (gcov_type) freq_scale / CGRAPH_FREQ_BASE; |
| if (freq > CGRAPH_FREQ_MAX) |
| freq = CGRAPH_FREQ_MAX; |
| |
| if (e->indirect_unknown_callee) |
| { |
| tree decl; |
| |
| if (call_stmt && (decl = gimple_call_fndecl (call_stmt))) |
| { |
| struct cgraph_node *callee = cgraph_get_node (decl); |
| gcc_checking_assert (callee); |
| new_edge = cgraph_create_edge (n, callee, call_stmt, count, freq); |
| } |
| else |
| { |
| new_edge = cgraph_create_indirect_edge (n, call_stmt, |
| e->indirect_info->ecf_flags, |
| count, freq); |
| *new_edge->indirect_info = *e->indirect_info; |
| } |
| } |
| else |
| { |
| new_edge = cgraph_create_edge (n, e->callee, call_stmt, count, freq); |
| if (e->indirect_info) |
| { |
| new_edge->indirect_info |
| = ggc_alloc_cleared_cgraph_indirect_call_info (); |
| *new_edge->indirect_info = *e->indirect_info; |
| } |
| } |
| |
| new_edge->inline_failed = e->inline_failed; |
| new_edge->indirect_inlining_edge = e->indirect_inlining_edge; |
| new_edge->lto_stmt_uid = stmt_uid; |
| /* Clone flags that depend on call_stmt availability manually. */ |
| new_edge->can_throw_external = e->can_throw_external; |
| new_edge->call_stmt_cannot_inline_p = e->call_stmt_cannot_inline_p; |
| if (update_original) |
| { |
| e->count -= new_edge->count; |
| if (e->count < 0) |
| e->count = 0; |
| } |
| cgraph_call_edge_duplication_hooks (e, new_edge); |
| return new_edge; |
| } |
| |
| |
| /* Create node representing clone of N executed COUNT times. Decrease |
| the execution counts from original node too. |
| The new clone will have decl set to DECL that may or may not be the same |
| as decl of N. |
| |
| When UPDATE_ORIGINAL is true, the counts are subtracted from the original |
| function's profile to reflect the fact that part of execution is handled |
| by node. |
| When CALL_DUPLICATOIN_HOOK is true, the ipa passes are acknowledged about |
| the new clone. Otherwise the caller is responsible for doing so later. */ |
| |
| struct cgraph_node * |
| cgraph_clone_node (struct cgraph_node *n, tree decl, gcov_type count, int freq, |
| bool update_original, |
| vec<cgraph_edge_p> redirect_callers, |
| bool call_duplication_hook) |
| { |
| struct cgraph_node *new_node = cgraph_create_empty_node (); |
| struct cgraph_edge *e; |
| gcov_type count_scale; |
| unsigned i; |
| |
| new_node->symbol.decl = decl; |
| symtab_register_node ((symtab_node)new_node); |
| new_node->origin = n->origin; |
| new_node->symbol.lto_file_data = n->symbol.lto_file_data; |
| if (new_node->origin) |
| { |
| new_node->next_nested = new_node->origin->nested; |
| new_node->origin->nested = new_node; |
| } |
| new_node->analyzed = n->analyzed; |
| new_node->local = n->local; |
| new_node->symbol.externally_visible = false; |
| new_node->local.local = true; |
| new_node->global = n->global; |
| new_node->rtl = n->rtl; |
| new_node->count = count; |
| new_node->frequency = n->frequency; |
| new_node->clone = n->clone; |
| new_node->clone.tree_map = NULL; |
| if (n->count) |
| { |
| if (new_node->count > n->count) |
| count_scale = REG_BR_PROB_BASE; |
| else |
| count_scale = new_node->count * REG_BR_PROB_BASE / n->count; |
| } |
| else |
| count_scale = 0; |
| if (update_original) |
| { |
| n->count -= count; |
| if (n->count < 0) |
| n->count = 0; |
| } |
| |
| FOR_EACH_VEC_ELT (redirect_callers, i, e) |
| { |
| /* Redirect calls to the old version node to point to its new |
| version. */ |
| cgraph_redirect_edge_callee (e, new_node); |
| } |
| |
| |
| for (e = n->callees;e; e=e->next_callee) |
| cgraph_clone_edge (e, new_node, e->call_stmt, e->lto_stmt_uid, |
| count_scale, freq, update_original); |
| |
| for (e = n->indirect_calls; e; e = e->next_callee) |
| cgraph_clone_edge (e, new_node, e->call_stmt, e->lto_stmt_uid, |
| count_scale, freq, update_original); |
| ipa_clone_references ((symtab_node)new_node, &n->symbol.ref_list); |
| |
| new_node->next_sibling_clone = n->clones; |
| if (n->clones) |
| n->clones->prev_sibling_clone = new_node; |
| n->clones = new_node; |
| new_node->clone_of = n; |
| |
| if (call_duplication_hook) |
| cgraph_call_node_duplication_hooks (n, new_node); |
| return new_node; |
| } |
| |
| /* Create a new name for clone of DECL, add SUFFIX. Returns an identifier. */ |
| |
| static GTY(()) unsigned int clone_fn_id_num; |
| |
| tree |
| clone_function_name (tree decl, const char *suffix) |
| { |
| tree name = DECL_ASSEMBLER_NAME (decl); |
| size_t len = IDENTIFIER_LENGTH (name); |
| char *tmp_name, *prefix; |
| |
| prefix = XALLOCAVEC (char, len + strlen (suffix) + 2); |
| memcpy (prefix, IDENTIFIER_POINTER (name), len); |
| strcpy (prefix + len + 1, suffix); |
| #ifndef NO_DOT_IN_LABEL |
| prefix[len] = '.'; |
| #elif !defined NO_DOLLAR_IN_LABEL |
| prefix[len] = '$'; |
| #else |
| prefix[len] = '_'; |
| #endif |
| ASM_FORMAT_PRIVATE_NAME (tmp_name, prefix, clone_fn_id_num++); |
| return get_identifier (tmp_name); |
| } |
| |
| /* Create callgraph node clone with new declaration. The actual body will |
| be copied later at compilation stage. |
| |
| TODO: after merging in ipa-sra use function call notes instead of args_to_skip |
| bitmap interface. |
| */ |
| struct cgraph_node * |
| cgraph_create_virtual_clone (struct cgraph_node *old_node, |
| vec<cgraph_edge_p> redirect_callers, |
| vec<ipa_replace_map_p, va_gc> *tree_map, |
| bitmap args_to_skip, |
| const char * suffix) |
| { |
| tree old_decl = old_node->symbol.decl; |
| struct cgraph_node *new_node = NULL; |
| tree new_decl; |
| size_t i; |
| struct ipa_replace_map *map; |
| |
| if (!flag_wpa) |
| gcc_checking_assert (tree_versionable_function_p (old_decl)); |
| |
| gcc_assert (old_node->local.can_change_signature || !args_to_skip); |
| |
| /* Make a new FUNCTION_DECL tree node */ |
| if (!args_to_skip) |
| new_decl = copy_node (old_decl); |
| else |
| new_decl = build_function_decl_skip_args (old_decl, args_to_skip, false); |
| DECL_STRUCT_FUNCTION (new_decl) = NULL; |
| |
| /* Generate a new name for the new version. */ |
| DECL_NAME (new_decl) = clone_function_name (old_decl, suffix); |
| SET_DECL_ASSEMBLER_NAME (new_decl, DECL_NAME (new_decl)); |
| SET_DECL_RTL (new_decl, NULL); |
| |
| new_node = cgraph_clone_node (old_node, new_decl, old_node->count, |
| CGRAPH_FREQ_BASE, false, |
| redirect_callers, false); |
| /* Update the properties. |
| Make clone visible only within this translation unit. Make sure |
| that is not weak also. |
| ??? We cannot use COMDAT linkage because there is no |
| ABI support for this. */ |
| DECL_EXTERNAL (new_node->symbol.decl) = 0; |
| if (DECL_ONE_ONLY (old_decl)) |
| DECL_SECTION_NAME (new_node->symbol.decl) = NULL; |
| DECL_COMDAT_GROUP (new_node->symbol.decl) = 0; |
| TREE_PUBLIC (new_node->symbol.decl) = 0; |
| DECL_COMDAT (new_node->symbol.decl) = 0; |
| DECL_WEAK (new_node->symbol.decl) = 0; |
| DECL_VIRTUAL_P (new_node->symbol.decl) = 0; |
| DECL_STATIC_CONSTRUCTOR (new_node->symbol.decl) = 0; |
| DECL_STATIC_DESTRUCTOR (new_node->symbol.decl) = 0; |
| new_node->clone.tree_map = tree_map; |
| new_node->clone.args_to_skip = args_to_skip; |
| FOR_EACH_VEC_SAFE_ELT (tree_map, i, map) |
| { |
| tree var = map->new_tree; |
| symtab_node ref_node; |
| |
| STRIP_NOPS (var); |
| if (TREE_CODE (var) != ADDR_EXPR) |
| continue; |
| var = get_base_var (var); |
| if (!var) |
| continue; |
| if (TREE_CODE (var) != FUNCTION_DECL |
| && TREE_CODE (var) != VAR_DECL) |
| continue; |
| |
| /* Record references of the future statement initializing the constant |
| argument. */ |
| ref_node = symtab_get_node (var); |
| gcc_checking_assert (ref_node); |
| ipa_record_reference ((symtab_node)new_node, (symtab_node)ref_node, |
| IPA_REF_ADDR, NULL); |
| } |
| if (!args_to_skip) |
| new_node->clone.combined_args_to_skip = old_node->clone.combined_args_to_skip; |
| else if (old_node->clone.combined_args_to_skip) |
| { |
| int newi = 0, oldi = 0; |
| tree arg; |
| bitmap new_args_to_skip = BITMAP_GGC_ALLOC (); |
| struct cgraph_node *orig_node; |
| for (orig_node = old_node; orig_node->clone_of; orig_node = orig_node->clone_of) |
| ; |
| for (arg = DECL_ARGUMENTS (orig_node->symbol.decl); |
| arg; arg = DECL_CHAIN (arg), oldi++) |
| { |
| if (bitmap_bit_p (old_node->clone.combined_args_to_skip, oldi)) |
| { |
| bitmap_set_bit (new_args_to_skip, oldi); |
| continue; |
| } |
| if (bitmap_bit_p (args_to_skip, newi)) |
| bitmap_set_bit (new_args_to_skip, oldi); |
| newi++; |
| } |
| new_node->clone.combined_args_to_skip = new_args_to_skip; |
| } |
| else |
| new_node->clone.combined_args_to_skip = args_to_skip; |
| new_node->symbol.externally_visible = 0; |
| new_node->local.local = 1; |
| new_node->lowered = true; |
| |
| cgraph_call_node_duplication_hooks (old_node, new_node); |
| |
| |
| return new_node; |
| } |
| |
| /* NODE is being removed from symbol table; see if its entry can be replaced by |
| other inline clone. */ |
| struct cgraph_node * |
| cgraph_find_replacement_node (struct cgraph_node *node) |
| { |
| struct cgraph_node *next_inline_clone, *replacement; |
| |
| for (next_inline_clone = node->clones; |
| next_inline_clone |
| && next_inline_clone->symbol.decl != node->symbol.decl; |
| next_inline_clone = next_inline_clone->next_sibling_clone) |
| ; |
| |
| /* If there is inline clone of the node being removed, we need |
| to put it into the position of removed node and reorganize all |
| other clones to be based on it. */ |
| if (next_inline_clone) |
| { |
| struct cgraph_node *n; |
| struct cgraph_node *new_clones; |
| |
| replacement = next_inline_clone; |
| |
| /* Unlink inline clone from the list of clones of removed node. */ |
| if (next_inline_clone->next_sibling_clone) |
| next_inline_clone->next_sibling_clone->prev_sibling_clone |
| = next_inline_clone->prev_sibling_clone; |
| if (next_inline_clone->prev_sibling_clone) |
| { |
| gcc_assert (node->clones != next_inline_clone); |
| next_inline_clone->prev_sibling_clone->next_sibling_clone |
| = next_inline_clone->next_sibling_clone; |
| } |
| else |
| { |
| gcc_assert (node->clones == next_inline_clone); |
| node->clones = next_inline_clone->next_sibling_clone; |
| } |
| |
| new_clones = node->clones; |
| node->clones = NULL; |
| |
| /* Copy clone info. */ |
| next_inline_clone->clone = node->clone; |
| |
| /* Now place it into clone tree at same level at NODE. */ |
| next_inline_clone->clone_of = node->clone_of; |
| next_inline_clone->prev_sibling_clone = NULL; |
| next_inline_clone->next_sibling_clone = NULL; |
| if (node->clone_of) |
| { |
| if (node->clone_of->clones) |
| node->clone_of->clones->prev_sibling_clone = next_inline_clone; |
| next_inline_clone->next_sibling_clone = node->clone_of->clones; |
| node->clone_of->clones = next_inline_clone; |
| } |
| |
| /* Merge the clone list. */ |
| if (new_clones) |
| { |
| if (!next_inline_clone->clones) |
| next_inline_clone->clones = new_clones; |
| else |
| { |
| n = next_inline_clone->clones; |
| while (n->next_sibling_clone) |
| n = n->next_sibling_clone; |
| n->next_sibling_clone = new_clones; |
| new_clones->prev_sibling_clone = n; |
| } |
| } |
| |
| /* Update clone_of pointers. */ |
| n = new_clones; |
| while (n) |
| { |
| n->clone_of = next_inline_clone; |
| n = n->next_sibling_clone; |
| } |
| return replacement; |
| } |
| else |
| return NULL; |
| } |
| |
| /* Like cgraph_set_call_stmt but walk the clone tree and update all |
| clones sharing the same function body. */ |
| |
| void |
| cgraph_set_call_stmt_including_clones (struct cgraph_node *orig, |
| gimple old_stmt, gimple new_stmt) |
| { |
| struct cgraph_node *node; |
| struct cgraph_edge *edge = cgraph_edge (orig, old_stmt); |
| |
| if (edge) |
| cgraph_set_call_stmt (edge, new_stmt); |
| |
| node = orig->clones; |
| if (node) |
| while (node != orig) |
| { |
| struct cgraph_edge *edge = cgraph_edge (node, old_stmt); |
| if (edge) |
| cgraph_set_call_stmt (edge, new_stmt); |
| if (node->clones) |
| node = node->clones; |
| else if (node->next_sibling_clone) |
| node = node->next_sibling_clone; |
| else |
| { |
| while (node != orig && !node->next_sibling_clone) |
| node = node->clone_of; |
| if (node != orig) |
| node = node->next_sibling_clone; |
| } |
| } |
| } |
| |
| /* Like cgraph_create_edge walk the clone tree and update all clones sharing |
| same function body. If clones already have edge for OLD_STMT; only |
| update the edge same way as cgraph_set_call_stmt_including_clones does. |
| |
| TODO: COUNT and LOOP_DEPTH should be properly distributed based on relative |
| frequencies of the clones. */ |
| |
| void |
| cgraph_create_edge_including_clones (struct cgraph_node *orig, |
| struct cgraph_node *callee, |
| gimple old_stmt, |
| gimple stmt, gcov_type count, |
| int freq, |
| cgraph_inline_failed_t reason) |
| { |
| struct cgraph_node *node; |
| struct cgraph_edge *edge; |
| |
| if (!cgraph_edge (orig, stmt)) |
| { |
| edge = cgraph_create_edge (orig, callee, stmt, count, freq); |
| edge->inline_failed = reason; |
| } |
| |
| node = orig->clones; |
| if (node) |
| while (node != orig) |
| { |
| struct cgraph_edge *edge = cgraph_edge (node, old_stmt); |
| |
| /* It is possible that clones already contain the edge while |
| master didn't. Either we promoted indirect call into direct |
| call in the clone or we are processing clones of unreachable |
| master where edges has been removed. */ |
| if (edge) |
| cgraph_set_call_stmt (edge, stmt); |
| else if (!cgraph_edge (node, stmt)) |
| { |
| edge = cgraph_create_edge (node, callee, stmt, count, |
| freq); |
| edge->inline_failed = reason; |
| } |
| |
| if (node->clones) |
| node = node->clones; |
| else if (node->next_sibling_clone) |
| node = node->next_sibling_clone; |
| else |
| { |
| while (node != orig && !node->next_sibling_clone) |
| node = node->clone_of; |
| if (node != orig) |
| node = node->next_sibling_clone; |
| } |
| } |
| } |
| |
| /* Remove the node from cgraph and all inline clones inlined into it. |
| Skip however removal of FORBIDDEN_NODE and return true if it needs to be |
| removed. This allows to call the function from outer loop walking clone |
| tree. */ |
| |
| bool |
| cgraph_remove_node_and_inline_clones (struct cgraph_node *node, struct cgraph_node *forbidden_node) |
| { |
| struct cgraph_edge *e, *next; |
| bool found = false; |
| |
| if (node == forbidden_node) |
| { |
| cgraph_remove_edge (node->callers); |
| return true; |
| } |
| for (e = node->callees; e; e = next) |
| { |
| next = e->next_callee; |
| if (!e->inline_failed) |
| found |= cgraph_remove_node_and_inline_clones (e->callee, forbidden_node); |
| } |
| cgraph_remove_node (node); |
| return found; |
| } |
| |
| /* The edges representing the callers of the NEW_VERSION node were |
| fixed by cgraph_function_versioning (), now the call_expr in their |
| respective tree code should be updated to call the NEW_VERSION. */ |
| |
| static void |
| update_call_expr (struct cgraph_node *new_version) |
| { |
| struct cgraph_edge *e; |
| |
| gcc_assert (new_version); |
| |
| /* Update the call expr on the edges to call the new version. */ |
| for (e = new_version->callers; e; e = e->next_caller) |
| { |
| struct function *inner_function = DECL_STRUCT_FUNCTION (e->caller->symbol.decl); |
| gimple_call_set_fndecl (e->call_stmt, new_version->symbol.decl); |
| maybe_clean_eh_stmt_fn (inner_function, e->call_stmt); |
| } |
| } |
| |
| |
| /* Create a new cgraph node which is the new version of |
| OLD_VERSION node. REDIRECT_CALLERS holds the callers |
| edges which should be redirected to point to |
| NEW_VERSION. ALL the callees edges of OLD_VERSION |
| are cloned to the new version node. Return the new |
| version node. |
| |
| If non-NULL BLOCK_TO_COPY determine what basic blocks |
| was copied to prevent duplications of calls that are dead |
| in the clone. */ |
| |
| struct cgraph_node * |
| cgraph_copy_node_for_versioning (struct cgraph_node *old_version, |
| tree new_decl, |
| vec<cgraph_edge_p> redirect_callers, |
| bitmap bbs_to_copy) |
| { |
| struct cgraph_node *new_version; |
| struct cgraph_edge *e; |
| unsigned i; |
| |
| gcc_assert (old_version); |
| |
| new_version = cgraph_create_node (new_decl); |
| |
| new_version->analyzed = old_version->analyzed; |
| new_version->local = old_version->local; |
| new_version->symbol.externally_visible = false; |
| new_version->local.local = old_version->analyzed; |
| new_version->global = old_version->global; |
| new_version->rtl = old_version->rtl; |
| new_version->count = old_version->count; |
| |
| for (e = old_version->callees; e; e=e->next_callee) |
| if (!bbs_to_copy |
| || bitmap_bit_p (bbs_to_copy, gimple_bb (e->call_stmt)->index)) |
| cgraph_clone_edge (e, new_version, e->call_stmt, |
| e->lto_stmt_uid, REG_BR_PROB_BASE, |
| CGRAPH_FREQ_BASE, |
| true); |
| for (e = old_version->indirect_calls; e; e=e->next_callee) |
| if (!bbs_to_copy |
| || bitmap_bit_p (bbs_to_copy, gimple_bb (e->call_stmt)->index)) |
| cgraph_clone_edge (e, new_version, e->call_stmt, |
| e->lto_stmt_uid, REG_BR_PROB_BASE, |
| CGRAPH_FREQ_BASE, |
| true); |
| FOR_EACH_VEC_ELT (redirect_callers, i, e) |
| { |
| /* Redirect calls to the old version node to point to its new |
| version. */ |
| cgraph_redirect_edge_callee (e, new_version); |
| } |
| |
| cgraph_call_node_duplication_hooks (old_version, new_version); |
| |
| return new_version; |
| } |
| |
| /* Perform function versioning. |
| Function versioning includes copying of the tree and |
| a callgraph update (creating a new cgraph node and updating |
| its callees and callers). |
| |
| REDIRECT_CALLERS varray includes the edges to be redirected |
| to the new version. |
| |
| TREE_MAP is a mapping of tree nodes we want to replace with |
| new ones (according to results of prior analysis). |
| OLD_VERSION_NODE is the node that is versioned. |
| |
| If non-NULL ARGS_TO_SKIP determine function parameters to remove |
| from new version. |
| If SKIP_RETURN is true, the new version will return void. |
| If non-NULL BLOCK_TO_COPY determine what basic blocks to copy. |
| If non_NULL NEW_ENTRY determine new entry BB of the clone. |
| |
| Return the new version's cgraph node. */ |
| |
| struct cgraph_node * |
| cgraph_function_versioning (struct cgraph_node *old_version_node, |
| vec<cgraph_edge_p> redirect_callers, |
| vec<ipa_replace_map_p, va_gc> *tree_map, |
| bitmap args_to_skip, |
| bool skip_return, |
| bitmap bbs_to_copy, |
| basic_block new_entry_block, |
| const char *clone_name) |
| { |
| tree old_decl = old_version_node->symbol.decl; |
| struct cgraph_node *new_version_node = NULL; |
| tree new_decl; |
| |
| if (!tree_versionable_function_p (old_decl)) |
| return NULL; |
| |
| gcc_assert (old_version_node->local.can_change_signature || !args_to_skip); |
| |
| /* Make a new FUNCTION_DECL tree node for the new version. */ |
| if (!args_to_skip && !skip_return) |
| new_decl = copy_node (old_decl); |
| else |
| new_decl |
| = build_function_decl_skip_args (old_decl, args_to_skip, skip_return); |
| |
| /* Generate a new name for the new version. */ |
| DECL_NAME (new_decl) = clone_function_name (old_decl, clone_name); |
| SET_DECL_ASSEMBLER_NAME (new_decl, DECL_NAME (new_decl)); |
| SET_DECL_RTL (new_decl, NULL); |
| |
| /* When the old decl was a con-/destructor make sure the clone isn't. */ |
| DECL_STATIC_CONSTRUCTOR(new_decl) = 0; |
| DECL_STATIC_DESTRUCTOR(new_decl) = 0; |
| |
| /* Create the new version's call-graph node. |
| and update the edges of the new node. */ |
| new_version_node = |
| cgraph_copy_node_for_versioning (old_version_node, new_decl, |
| redirect_callers, bbs_to_copy); |
| |
| /* Copy the OLD_VERSION_NODE function tree to the new version. */ |
| tree_function_versioning (old_decl, new_decl, tree_map, false, args_to_skip, |
| skip_return, bbs_to_copy, new_entry_block); |
| |
| /* Update the new version's properties. |
| Make The new version visible only within this translation unit. Make sure |
| that is not weak also. |
| ??? We cannot use COMDAT linkage because there is no |
| ABI support for this. */ |
| symtab_make_decl_local (new_version_node->symbol.decl); |
| DECL_VIRTUAL_P (new_version_node->symbol.decl) = 0; |
| new_version_node->symbol.externally_visible = 0; |
| new_version_node->local.local = 1; |
| new_version_node->lowered = true; |
| |
| /* Update the call_expr on the edges to call the new version node. */ |
| update_call_expr (new_version_node); |
| |
| cgraph_call_function_insertion_hooks (new_version_node); |
| return new_version_node; |
| } |
| |
| /* Given virtual clone, turn it into actual clone. */ |
| |
| static void |
| cgraph_materialize_clone (struct cgraph_node *node) |
| { |
| bitmap_obstack_initialize (NULL); |
| node->former_clone_of = node->clone_of->symbol.decl; |
| if (node->clone_of->former_clone_of) |
| node->former_clone_of = node->clone_of->former_clone_of; |
| /* Copy the OLD_VERSION_NODE function tree to the new version. */ |
| tree_function_versioning (node->clone_of->symbol.decl, node->symbol.decl, |
| node->clone.tree_map, true, |
| node->clone.args_to_skip, false, |
| NULL, NULL); |
| if (cgraph_dump_file) |
| { |
| dump_function_to_file (node->clone_of->symbol.decl, cgraph_dump_file, dump_flags); |
| dump_function_to_file (node->symbol.decl, cgraph_dump_file, dump_flags); |
| } |
| |
| /* Function is no longer clone. */ |
| if (node->next_sibling_clone) |
| node->next_sibling_clone->prev_sibling_clone = node->prev_sibling_clone; |
| if (node->prev_sibling_clone) |
| node->prev_sibling_clone->next_sibling_clone = node->next_sibling_clone; |
| else |
| node->clone_of->clones = node->next_sibling_clone; |
| node->next_sibling_clone = NULL; |
| node->prev_sibling_clone = NULL; |
| if (!node->clone_of->analyzed && !node->clone_of->clones) |
| { |
| cgraph_release_function_body (node->clone_of); |
| cgraph_node_remove_callees (node->clone_of); |
| ipa_remove_all_references (&node->clone_of->symbol.ref_list); |
| } |
| node->clone_of = NULL; |
| bitmap_obstack_release (NULL); |
| } |
| |
| /* Once all functions from compilation unit are in memory, produce all clones |
| and update all calls. We might also do this on demand if we don't want to |
| bring all functions to memory prior compilation, but current WHOPR |
| implementation does that and it is is bit easier to keep everything right in |
| this order. */ |
| |
| void |
| cgraph_materialize_all_clones (void) |
| { |
| struct cgraph_node *node; |
| bool stabilized = false; |
| |
| if (cgraph_dump_file) |
| fprintf (cgraph_dump_file, "Materializing clones\n"); |
| #ifdef ENABLE_CHECKING |
| verify_cgraph (); |
| #endif |
| |
| /* We can also do topological order, but number of iterations should be |
| bounded by number of IPA passes since single IPA pass is probably not |
| going to create clones of clones it created itself. */ |
| while (!stabilized) |
| { |
| stabilized = true; |
| FOR_EACH_FUNCTION (node) |
| { |
| if (node->clone_of && node->symbol.decl != node->clone_of->symbol.decl |
| && !gimple_has_body_p (node->symbol.decl)) |
| { |
| if (gimple_has_body_p (node->clone_of->symbol.decl)) |
| { |
| if (cgraph_dump_file) |
| { |
| fprintf (cgraph_dump_file, "cloning %s to %s\n", |
| xstrdup (cgraph_node_name (node->clone_of)), |
| xstrdup (cgraph_node_name (node))); |
| if (node->clone.tree_map) |
| { |
| unsigned int i; |
| fprintf (cgraph_dump_file, " replace map: "); |
| for (i = 0; |
| i < vec_safe_length (node->clone.tree_map); |
| i++) |
| { |
| struct ipa_replace_map *replace_info; |
| replace_info = (*node->clone.tree_map)[i]; |
| print_generic_expr (cgraph_dump_file, replace_info->old_tree, 0); |
| fprintf (cgraph_dump_file, " -> "); |
| print_generic_expr (cgraph_dump_file, replace_info->new_tree, 0); |
| fprintf (cgraph_dump_file, "%s%s;", |
| replace_info->replace_p ? "(replace)":"", |
| replace_info->ref_p ? "(ref)":""); |
| } |
| fprintf (cgraph_dump_file, "\n"); |
| } |
| if (node->clone.args_to_skip) |
| { |
| fprintf (cgraph_dump_file, " args_to_skip: "); |
| dump_bitmap (cgraph_dump_file, node->clone.args_to_skip); |
| } |
| if (node->clone.args_to_skip) |
| { |
| fprintf (cgraph_dump_file, " combined_args_to_skip:"); |
| dump_bitmap (cgraph_dump_file, node->clone.combined_args_to_skip); |
| } |
| } |
| cgraph_materialize_clone (node); |
| stabilized = false; |
| } |
| } |
| } |
| } |
| FOR_EACH_FUNCTION (node) |
| if (!node->analyzed && node->callees) |
| cgraph_node_remove_callees (node); |
| if (cgraph_dump_file) |
| fprintf (cgraph_dump_file, "Materialization Call site updates done.\n"); |
| #ifdef ENABLE_CHECKING |
| verify_cgraph (); |
| #endif |
| symtab_remove_unreachable_nodes (false, cgraph_dump_file); |
| } |
| |
| #include "gt-cgraphclones.h" |