-/* Callgraph based intraprocedural optimizations.
- Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
+/* Callgraph based interprocedural optimizations.
+ Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
Contributed by Jan Hubicka
This file is part of GCC.
02110-1301, USA. */
/* This module implements main driver of compilation process as well as
- few basic intraprocedural optimizers.
+ few basic interprocedural optimizers.
The main scope of this file is to act as an interface in between
tree based frontends and the backend (and middle end)
This function is called once front-end has parsed whole body of function
and it is certain that the function body nor the declaration will change.
- (There is one exception needed for implementing GCC extern inline function.)
+ (There is one exception needed for implementing GCC extern inline
+ function.)
- - cgraph_varpool_finalize_variable
+ - varpool_finalize_variable
This function has same behavior as the above but is used for static
variables.
- cgraph_finalize_compilation_unit
- This function is called once compilation unit is finalized and it will
- no longer change.
+ This function is called once (source level) compilation unit is finalized
+ and it will no longer change.
In the unit-at-a-time the call-graph construction and local function
analysis takes place here. Bodies of unreachable functions are released
to conserve memory usage.
- ??? The compilation unit in this point of view should be compilation
- unit as defined by the language - for instance C frontend allows multiple
- compilation units to be parsed at once and it should call function each
- time parsing is done so we save memory.
+ The function can be called multiple times when multiple source level
+ compilation units are combined (such as in C frontend)
- cgraph_optimize
taken are marked as local. Backend can then use this information to
modify calling conventions, do better inlining or similar optimizations.
- - cgraph_assemble_pending_functions
- - cgraph_varpool_assemble_pending_variables
-
- In non-unit-at-a-time mode these functions can be used to force compilation
- of functions or variables that are known to be needed at given stage
- of compilation
-
- cgraph_mark_needed_node
- - cgraph_varpool_mark_needed_node
+ - varpool_mark_needed_node
- When function or variable is referenced by some hidden way (for instance
- via assembly code and marked by attribute "used"), the call-graph data structure
- must be updated accordingly by this function.
+ When function or variable is referenced by some hidden way the call-graph
+ data structure must be updated accordingly by this function.
+ There should be little need to call this function and all the references
+ should be made explicit to cgraph code. At present these functions are
+ used by C++ frontend to explicitly mark the keyed methods.
- analyze_expr callback
This function is used to expand function and pass it into RTL back-end.
Front-end should not make any assumptions about when this function can be
called. In particular cgraph_assemble_pending_functions,
- cgraph_varpool_assemble_pending_variables, cgraph_finalize_function,
- cgraph_varpool_finalize_function, cgraph_optimize can cause arbitrarily
+ varpool_assemble_pending_variables, cgraph_finalize_function,
+ varpool_finalize_function, cgraph_optimize can cause arbitrarily
previously finalized functions to be expanded.
We implement two compilation modes.
static void cgraph_expand_all_functions (void);
static void cgraph_mark_functions_to_output (void);
static void cgraph_expand_function (struct cgraph_node *);
-static tree record_reference (tree *, int *, void *);
-static void cgraph_analyze_function (struct cgraph_node *node);
-
-/* Records tree nodes seen in record_reference. Simply using
- walk_tree_without_duplicates doesn't guarantee each node is visited
- once because it gets a new htab upon each recursive call from
- record_reference itself. */
-static struct pointer_set_t *visited_nodes;
+static void cgraph_output_pending_asms (void);
static FILE *cgraph_dump_file;
}
/* If the user told us it is used, then it must be so. */
- if (node->local.externally_visible
- || lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
+ if (node->local.externally_visible)
+ return true;
+
+ if (!flag_unit_at_a_time && lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
return true;
/* ??? If the assembler name is set by hand, it is possible to assemble
&& TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
return true;
+ /* With -fkeep-inline-functions we are keeping all inline functions except
+ for extern inline ones. */
+ if (flag_keep_inline_functions
+ && DECL_DECLARED_INLINE_P (decl)
+ && !DECL_EXTERNAL (decl))
+ return true;
+
/* If we decided it was needed before, but at the time we didn't have
the body of the function available, then it's still needed. We have
to go back and re-check its dependencies now. */
return true;
/* Externally visible functions must be output. The exception is
- COMDAT functions that must be output only when they are needed. */
- if ((TREE_PUBLIC (decl) && !flag_whole_program)
+ COMDAT functions that must be output only when they are needed.
+
+ When not optimizing, also output the static functions. (see
+ PR24561), but don't do so for always_inline functions, functions
+ declared inline and nested functions. These was optimized out
+ in the original implementation and it is unclear whether we want
+ to change the behavior here. */
+ if (((TREE_PUBLIC (decl)
+ || (!optimize && !node->local.disregard_inline_limits
+ && !DECL_DECLARED_INLINE_P (decl)
+ && !node->origin))
+ && !flag_whole_program)
&& !DECL_COMDAT (decl) && !DECL_EXTERNAL (decl))
return true;
|| (!node->local.disregard_inline_limits
/* When declared inline, defer even the uninlinable functions.
This allows them to be eliminated when unused. */
- && !DECL_DECLARED_INLINE_P (decl)
+ && !DECL_DECLARED_INLINE_P (decl)
&& (!node->local.inlinable || !cgraph_default_inline_p (node, NULL))))
return true;
return false;
}
-/* Walk the decls we marked as necessary and see if they reference new
- variables or functions and add them into the worklists. */
-static bool
-cgraph_varpool_analyze_pending_decls (void)
+/* Process CGRAPH_NEW_FUNCTIONS and perform actions necessary to add these
+ functions into callgraph in a way so they look like ordinary reachable
+ functions inserted into callgraph already at construction time. */
+
+bool
+cgraph_process_new_functions (void)
{
- bool changed = false;
- timevar_push (TV_CGRAPH);
+ bool output = false;
+ tree fndecl;
+ struct cgraph_node *node;
- while (cgraph_varpool_first_unanalyzed_node)
+ /* Note that this queue may grow as its being processed, as the new
+ functions may generate new ones. */
+ while (cgraph_new_nodes)
{
- tree decl = cgraph_varpool_first_unanalyzed_node->decl;
-
- cgraph_varpool_first_unanalyzed_node->analyzed = true;
-
- cgraph_varpool_first_unanalyzed_node = cgraph_varpool_first_unanalyzed_node->next_needed;
-
- if (DECL_INITIAL (decl))
+ node = cgraph_new_nodes;
+ fndecl = node->decl;
+ cgraph_new_nodes = cgraph_new_nodes->next_needed;
+ switch (cgraph_state)
{
- visited_nodes = pointer_set_create ();
- walk_tree (&DECL_INITIAL (decl), record_reference, NULL, visited_nodes);
- pointer_set_destroy (visited_nodes);
- visited_nodes = NULL;
- }
- changed = true;
- }
- timevar_pop (TV_CGRAPH);
- return changed;
-}
-
-/* Optimization of function bodies might've rendered some variables as
- unnecessary so we want to avoid these from being compiled.
-
- This is done by pruning the queue and keeping only the variables that
- really appear needed (ie they are either externally visible or referenced
- by compiled function). Re-doing the reachability analysis on variables
- brings back the remaining variables referenced by these. */
-static void
-cgraph_varpool_remove_unreferenced_decls (void)
-{
- struct cgraph_varpool_node *next, *node = cgraph_varpool_nodes_queue;
+ case CGRAPH_STATE_CONSTRUCTION:
+ /* At construction time we just need to finalize function and move
+ it into reachable functions list. */
+
+ node->next_needed = NULL;
+ node->needed = node->reachable = false;
+ cgraph_finalize_function (fndecl, false);
+ cgraph_mark_reachable_node (node);
+ output = true;
+ break;
- cgraph_varpool_reset_queue ();
+ case CGRAPH_STATE_IPA:
+ case CGRAPH_STATE_IPA_SSA:
+ /* When IPA optimization already started, do all essential
+ transformations that has been already performed on the whole
+ cgraph but not on this function. */
+
+ tree_register_cfg_hooks ();
+ if (!node->analyzed)
+ cgraph_analyze_function (node);
+ push_cfun (DECL_STRUCT_FUNCTION (fndecl));
+ current_function_decl = fndecl;
+ node->local.inlinable = tree_inlinable_function_p (fndecl);
+ node->local.self_insns = estimate_num_insns (fndecl,
+ &eni_inlining_weights);
+ node->local.disregard_inline_limits
+ = lang_hooks.tree_inlining.disregard_inline_limits (fndecl);
+ /* Inlining characteristics are maintained by the
+ cgraph_mark_inline. */
+ node->global.insns = node->local.self_insns;
+ if (flag_really_no_inline && !node->local.disregard_inline_limits)
+ node->local.inlinable = 0;
+ if ((cgraph_state == CGRAPH_STATE_IPA_SSA
+ && !gimple_in_ssa_p (DECL_STRUCT_FUNCTION (fndecl)))
+ /* When not optimizing, be sure we run early local passes anyway
+ to expand OMP. */
+ || !optimize)
+ execute_pass_list (pass_early_local_passes.sub);
+ free_dominance_info (CDI_POST_DOMINATORS);
+ free_dominance_info (CDI_DOMINATORS);
+ pop_cfun ();
+ current_function_decl = NULL;
+ break;
- if (errorcount || sorrycount)
- return;
+ case CGRAPH_STATE_EXPANSION:
+ /* Functions created during expansion shall be compiled
+ directly. */
+ node->output = 0;
+ cgraph_expand_function (node);
+ break;
- while (node)
- {
- tree decl = node->decl;
- next = node->next_needed;
- node->needed = 0;
-
- if (node->finalized
- && ((DECL_ASSEMBLER_NAME_SET_P (decl)
- && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
- || node->force_output
- || decide_is_variable_needed (node, decl)
- /* ??? Cgraph does not yet rule the world with an iron hand,
- and does not control the emission of debug information.
- After a variable has its DECL_RTL set, we must assume that
- it may be referenced by the debug information, and we can
- no longer elide it. */
- || DECL_RTL_SET_P (decl)))
- cgraph_varpool_mark_needed_node (node);
-
- node = next;
+ default:
+ gcc_unreachable ();
+ break;
+ }
}
- cgraph_varpool_analyze_pending_decls ();
+ return output;
}
-
/* When not doing unit-at-a-time, output all functions enqueued.
Return true when such a functions were found. */
-bool
+static bool
cgraph_assemble_pending_functions (void)
{
bool output = false;
if (flag_unit_at_a_time)
return false;
+ cgraph_output_pending_asms ();
+
while (cgraph_nodes_queue)
{
struct cgraph_node *n = cgraph_nodes_queue;
cgraph_expand_function (n);
output = true;
}
+ output |= cgraph_process_new_functions ();
}
return output;
}
+
+
/* As an GCC extension we allow redefinition of the function. The
semantics when both copies of bodies differ is not well defined.
We replace the old body with new body so in unit at a time mode
/* If node->output is set, then this is a unit-at-a-time compilation
and we have already begun whole-unit analysis. This is *not*
testing for whether we've already emitted the function. That
- case can be sort-of legitimately seen with real function
+ case can be sort-of legitimately seen with real function
redefinition errors. I would argue that the front end should
never present us with such a case, but don't enforce that for now. */
gcc_assert (!node->output);
if (!flag_unit_at_a_time)
{
- struct cgraph_node *n;
+ struct cgraph_node *n, *next;
- for (n = cgraph_nodes; n; n = n->next)
- if (n->global.inlined_to == node)
- cgraph_remove_node (n);
+ for (n = cgraph_nodes; n; n = next)
+ {
+ next = n->next;
+ if (n->global.inlined_to == node)
+ cgraph_remove_node (n);
+ }
}
cgraph_node_remove_callees (node);
}
}
+static void
+cgraph_lower_function (struct cgraph_node *node)
+{
+ if (node->lowered)
+ return;
+ tree_lowering_passes (node->decl);
+ node->lowered = true;
+}
+
/* DECL has been parsed. Take it, queue it, compile it at the whim of the
logic in effect. If NESTED is true, then our caller cannot stand to have
the garbage collector run at the moment. We would need to either create
if (node->local.finalized)
cgraph_reset_node (node);
+ node->pid = cgraph_max_pid ++;
notice_global_symbol (decl);
node->decl = decl;
node->local.finalized = true;
/* If not unit at a time, then we need to create the call graph
now, so that called functions can be queued and emitted now. */
if (!flag_unit_at_a_time)
- {
- cgraph_analyze_function (node);
- cgraph_decide_inlining_incrementally (node, false);
- }
+ cgraph_analyze_function (node);
if (decide_is_function_needed (node, decl))
cgraph_mark_needed_node (node);
do_warn_unused_parameter (decl);
}
-void
-cgraph_lower_function (struct cgraph_node *node)
-{
- if (node->lowered)
- return;
- tree_lowering_passes (node->decl);
- node->lowered = true;
-}
-
-/* Walk tree and record all calls. Called via walk_tree. */
-static tree
-record_reference (tree *tp, int *walk_subtrees, void *data)
-{
- tree t = *tp;
-
- switch (TREE_CODE (t))
- {
- case VAR_DECL:
- /* ??? Really, we should mark this decl as *potentially* referenced
- by this function and re-examine whether the decl is actually used
- after rtl has been generated. */
- if (TREE_STATIC (t) || DECL_EXTERNAL (t))
- {
- cgraph_varpool_mark_needed_node (cgraph_varpool_node (t));
- if (lang_hooks.callgraph.analyze_expr)
- return lang_hooks.callgraph.analyze_expr (tp, walk_subtrees,
- data);
- }
- break;
-
- case FDESC_EXPR:
- case ADDR_EXPR:
- if (flag_unit_at_a_time)
- {
- /* Record dereferences to the functions. This makes the
- functions reachable unconditionally. */
- tree decl = TREE_OPERAND (*tp, 0);
- if (TREE_CODE (decl) == FUNCTION_DECL)
- cgraph_mark_needed_node (cgraph_node (decl));
- }
- break;
-
- default:
- /* Save some cycles by not walking types and declaration as we
- won't find anything useful there anyway. */
- if (IS_TYPE_OR_DECL_P (*tp))
- {
- *walk_subtrees = 0;
- break;
- }
-
- if ((unsigned int) TREE_CODE (t) >= LAST_AND_UNUSED_TREE_CODE)
- return lang_hooks.callgraph.analyze_expr (tp, walk_subtrees, data);
- break;
- }
-
- return NULL;
-}
-
-/* Create cgraph edges for function calls inside BODY from NODE. */
-
-static void
-cgraph_create_edges (struct cgraph_node *node, tree body)
-{
- basic_block bb;
-
- struct function *this_cfun = DECL_STRUCT_FUNCTION (body);
- block_stmt_iterator bsi;
- tree step;
- visited_nodes = pointer_set_create ();
-
- /* Reach the trees by walking over the CFG, and note the
- enclosing basic-blocks in the call edges. */
- FOR_EACH_BB_FN (bb, this_cfun)
- for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
- {
- tree stmt = bsi_stmt (bsi);
- tree call = get_call_expr_in (stmt);
- tree decl;
-
- if (call && (decl = get_callee_fndecl (call)))
- {
- cgraph_create_edge (node, cgraph_node (decl), stmt,
- bb->count,
- bb->loop_depth);
- walk_tree (&TREE_OPERAND (call, 1),
- record_reference, node, visited_nodes);
- if (TREE_CODE (stmt) == MODIFY_EXPR)
- walk_tree (&TREE_OPERAND (stmt, 0),
- record_reference, node, visited_nodes);
- }
- else
- walk_tree (bsi_stmt_ptr (bsi), record_reference, node, visited_nodes);
- }
-
- /* Look for initializers of constant variables and private statics. */
- for (step = DECL_STRUCT_FUNCTION (body)->unexpanded_var_list;
- step;
- step = TREE_CHAIN (step))
- {
- tree decl = TREE_VALUE (step);
- if (TREE_CODE (decl) == VAR_DECL
- && (TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
- && flag_unit_at_a_time)
- cgraph_varpool_finalize_decl (decl);
- else if (TREE_CODE (decl) == VAR_DECL && DECL_INITIAL (decl))
- walk_tree (&DECL_INITIAL (decl), record_reference, node, visited_nodes);
- }
-
- pointer_set_destroy (visited_nodes);
- visited_nodes = NULL;
-}
-
-/* Give initial reasons why inlining would fail. Those gets
- either NULLified or usually overwritten by more precise reason
- later. */
-static void
-initialize_inline_failed (struct cgraph_node *node)
-{
- struct cgraph_edge *e;
-
- for (e = node->callers; e; e = e->next_caller)
- {
- gcc_assert (!e->callee->global.inlined_to);
- gcc_assert (e->inline_failed);
- if (node->local.redefined_extern_inline)
- e->inline_failed = N_("redefined extern inline functions are not "
- "considered for inlining");
- else if (!node->local.inlinable)
- e->inline_failed = N_("function not inlinable");
- else
- e->inline_failed = N_("function not considered for inlining");
- }
-}
-
-/* Rebuild call edges from current function after a passes not aware
- of cgraph updating. */
-static void
-rebuild_cgraph_edges (void)
-{
- basic_block bb;
- struct cgraph_node *node = cgraph_node (current_function_decl);
- block_stmt_iterator bsi;
-
- cgraph_node_remove_callees (node);
-
- node->count = ENTRY_BLOCK_PTR->count;
-
- FOR_EACH_BB (bb)
- for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
- {
- tree stmt = bsi_stmt (bsi);
- tree call = get_call_expr_in (stmt);
- tree decl;
-
- if (call && (decl = get_callee_fndecl (call)))
- cgraph_create_edge (node, cgraph_node (decl), stmt,
- bb->count,
- bb->loop_depth);
- }
- initialize_inline_failed (node);
- gcc_assert (!node->global.inlined_to);
-}
-
-struct tree_opt_pass pass_rebuild_cgraph_edges =
-{
- NULL, /* name */
- NULL, /* gate */
- rebuild_cgraph_edges, /* execute */
- NULL, /* sub */
- NULL, /* next */
- 0, /* static_pass_number */
- 0, /* tv_id */
- PROP_cfg, /* properties_required */
- 0, /* properties_provided */
- 0, /* properties_destroyed */
- 0, /* todo_flags_start */
- 0, /* todo_flags_finish */
- 0 /* letter */
-};
-
/* Verify cgraph nodes of given cgraph node. */
void
verify_cgraph_node (struct cgraph_node *node)
block_stmt_iterator bsi;
bool error_found = false;
+ if (errorcount || sorrycount)
+ return;
+
timevar_push (TV_CGRAPH_VERIFY);
for (e = node->callees; e; e = e->next_callee)
if (e->aux)
cgraph_node_name (e->caller), cgraph_node_name (e->callee));
error_found = true;
}
+ if (node->count < 0)
+ {
+ error ("Execution count is negative");
+ error_found = true;
+ }
for (e = node->callers; e; e = e->next_caller)
{
+ if (e->count < 0)
+ {
+ error ("caller edge count is negative");
+ error_found = true;
+ }
+ if (e->frequency < 0)
+ {
+ error ("caller edge frequency is negative");
+ error_found = true;
+ }
+ if (e->frequency > CGRAPH_FREQ_MAX)
+ {
+ error ("caller edge frequency is too large");
+ error_found = true;
+ }
if (!e->inline_failed)
{
if (node->global.inlined_to
}
if (!node->callers && node->global.inlined_to)
{
- error ("inlined_to pointer is set but no predecesors found");
+ error ("inlined_to pointer is set but no predecessors found");
error_found = true;
}
if (node->global.inlined_to == node)
main_clone = main_clone->next_clone)
if (main_clone == node)
break;
- if (!node)
+ if (!cgraph_node (node->decl))
{
- error ("node not found in DECL_ASSEMBLER_NAME hash");
+ error ("node not found in cgraph_hash");
error_found = true;
}
-
+
if (node->analyzed
&& DECL_SAVED_TREE (node->decl) && !TREE_ASM_WRITTEN (node->decl)
&& (!DECL_EXTERNAL (node->decl) || node->global.inlined_to))
{
/* The nodes we're interested in are never shared, so walk
the tree ignoring duplicates. */
- visited_nodes = pointer_set_create ();
+ struct pointer_set_t *visited_nodes = pointer_set_create ();
/* Reach the trees by walking over the CFG, and note the
enclosing basic-blocks in the call edges. */
FOR_EACH_BB_FN (this_block, this_cfun)
debug_generic_stmt (stmt);
error_found = true;
}
- if (e->callee->decl != cgraph_node (decl)->decl)
+ if (e->callee->decl != cgraph_node (decl)->decl
+ && e->inline_failed)
{
error ("edge points to wrong declaration:");
debug_tree (e->callee->decl);
}
}
pointer_set_destroy (visited_nodes);
- visited_nodes = NULL;
}
else
/* No CFG available?! */
verify_cgraph_node (node);
}
+/* Output all asm statements we have stored up to be output. */
-/* Output all variables enqueued to be assembled. */
-bool
-cgraph_varpool_assemble_pending_decls (void)
+static void
+cgraph_output_pending_asms (void)
{
- bool changed = false;
+ struct cgraph_asm_node *can;
if (errorcount || sorrycount)
- return false;
-
- /* EH might mark decls as needed during expansion. This should be safe since
- we don't create references to new function, but it should not be used
- elsewhere. */
- cgraph_varpool_analyze_pending_decls ();
-
- while (cgraph_varpool_nodes_queue)
- {
- tree decl = cgraph_varpool_nodes_queue->decl;
- struct cgraph_varpool_node *node = cgraph_varpool_nodes_queue;
+ return;
- cgraph_varpool_nodes_queue = cgraph_varpool_nodes_queue->next_needed;
- if (!TREE_ASM_WRITTEN (decl) && !node->alias && !DECL_EXTERNAL (decl))
- {
- assemble_variable (decl, 0, 1, 0);
- /* Local static variables are never seen by check_global_declarations
- so we need to output debug info by hand. */
- if (DECL_CONTEXT (decl)
- && (TREE_CODE (DECL_CONTEXT (decl)) == BLOCK
- || TREE_CODE (DECL_CONTEXT (decl)) == FUNCTION_DECL)
- && errorcount == 0 && sorrycount == 0)
- {
- timevar_push (TV_SYMOUT);
- (*debug_hooks->global_decl) (decl);
- timevar_pop (TV_SYMOUT);
- }
- changed = true;
- }
- node->next_needed = NULL;
- }
- return changed;
+ for (can = cgraph_asm_nodes; can; can = can->next)
+ assemble_asm (can->asm_str);
+ cgraph_asm_nodes = NULL;
}
/* Analyze the function scheduled to be output. */
-static void
+void
cgraph_analyze_function (struct cgraph_node *node)
{
tree decl = node->decl;
push_cfun (DECL_STRUCT_FUNCTION (decl));
cgraph_lower_function (node);
- /* First kill forward declaration so reverse inlining works properly. */
- cgraph_create_edges (node, decl);
-
+ node->local.estimated_self_stack_size = estimated_stack_frame_size ();
+ node->global.estimated_stack_size = node->local.estimated_self_stack_size;
+ node->global.stack_frame_offset = 0;
node->local.inlinable = tree_inlinable_function_p (decl);
- node->local.self_insns = estimate_num_insns (decl);
+ if (!flag_unit_at_a_time)
+ node->local.self_insns = estimate_num_insns (decl, &eni_inlining_weights);
if (node->local.inlinable)
node->local.disregard_inline_limits
= lang_hooks.tree_inlining.disregard_inline_limits (decl);
- initialize_inline_failed (node);
if (flag_really_no_inline && !node->local.disregard_inline_limits)
node->local.inlinable = 0;
/* Inlining characteristics are maintained by the cgraph_mark_inline. */
node->global.insns = node->local.self_insns;
+ if (!flag_unit_at_a_time)
+ {
+ bitmap_obstack_initialize (NULL);
+ tree_register_cfg_hooks ();
+ execute_pass_list (pass_early_local_passes.sub);
+ free_dominance_info (CDI_POST_DOMINATORS);
+ free_dominance_info (CDI_DOMINATORS);
+ bitmap_obstack_release (NULL);
+ }
node->analyzed = true;
pop_cfun ();
current_function_decl = NULL;
}
-/* Analyze the whole compilation unit once it is parsed completely. */
+/* Look for externally_visible and used attributes and mark cgraph nodes
+ accordingly.
-void
-cgraph_finalize_compilation_unit (void)
+ We cannot mark the nodes at the point the attributes are processed (in
+ handle_*_attribute) because the copy of the declarations available at that
+ point may not be canonical. For example, in:
+
+ void f();
+ void f() __attribute__((used));
+
+ the declaration we see in handle_used_attribute will be the second
+ declaration -- but the front end will subsequently merge that declaration
+ with the original declaration and discard the second declaration.
+
+ Furthermore, we can't mark these nodes in cgraph_finalize_function because:
+
+ void f() {}
+ void f() __attribute__((externally_visible));
+
+ is valid.
+
+ So, we walk the nodes at the end of the translation unit, applying the
+ attributes at that point. */
+
+static void
+process_function_and_variable_attributes (struct cgraph_node *first,
+ struct varpool_node *first_var)
{
struct cgraph_node *node;
- /* Keep track of already processed nodes when called multiple times for
- intermodule optimization. */
- static struct cgraph_node *first_analyzed;
-
- finish_aliases_1 ();
+ struct varpool_node *vnode;
- if (!flag_unit_at_a_time)
+ for (node = cgraph_nodes; node != first; node = node->next)
{
- cgraph_assemble_pending_functions ();
- return;
+ tree decl = node->decl;
+ if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
+ {
+ mark_decl_referenced (decl);
+ if (node->local.finalized)
+ cgraph_mark_needed_node (node);
+ }
+ if (lookup_attribute ("externally_visible", DECL_ATTRIBUTES (decl)))
+ {
+ if (! TREE_PUBLIC (node->decl))
+ warning (OPT_Wattributes,
+ "%J%<externally_visible%> attribute have effect only on public objects",
+ node->decl);
+ else
+ {
+ if (node->local.finalized)
+ cgraph_mark_needed_node (node);
+ node->local.externally_visible = true;
+ }
+ }
}
-
- if (!quiet_flag)
+ for (vnode = varpool_nodes; vnode != first_var; vnode = vnode->next)
{
- fprintf (stderr, "\nAnalyzing compilation unit");
- fflush (stderr);
+ tree decl = vnode->decl;
+ if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
+ {
+ mark_decl_referenced (decl);
+ if (vnode->finalized)
+ varpool_mark_needed_node (vnode);
+ }
+ if (lookup_attribute ("externally_visible", DECL_ATTRIBUTES (decl)))
+ {
+ if (! TREE_PUBLIC (vnode->decl))
+ warning (OPT_Wattributes,
+ "%J%<externally_visible%> attribute have effect only on public objects",
+ vnode->decl);
+ else
+ {
+ if (vnode->finalized)
+ varpool_mark_needed_node (vnode);
+ vnode->externally_visible = true;
+ }
+ }
}
+}
- timevar_push (TV_CGRAPH);
- cgraph_varpool_analyze_pending_decls ();
+/* Process CGRAPH_NODES_NEEDED queue, analyze each function (and transitively
+ each reachable functions) and build cgraph.
+ The function can be called multiple times after inserting new nodes
+ into beginning of queue. Just the new part of queue is re-scanned then. */
+
+static void
+cgraph_analyze_functions (void)
+{
+ /* Keep track of already processed nodes when called multiple times for
+ intermodule optimization. */
+ static struct cgraph_node *first_analyzed;
+ struct cgraph_node *first_processed = first_analyzed;
+ static struct varpool_node *first_analyzed_var;
+ struct cgraph_node *node, *next;
+
+ process_function_and_variable_attributes (first_processed,
+ first_analyzed_var);
+ first_processed = cgraph_nodes;
+ first_analyzed_var = varpool_nodes;
+ varpool_analyze_pending_decls ();
if (cgraph_dump_file)
{
fprintf (cgraph_dump_file, "Initial entry points:");
fprintf (cgraph_dump_file, " %s", cgraph_node_name (node));
fprintf (cgraph_dump_file, "\n");
}
+ cgraph_process_new_functions ();
/* Propagate reachability flag and lower representation of all reachable
functions. In the future, lowering will introduce new functions and
if (!edge->callee->reachable)
cgraph_mark_reachable_node (edge->callee);
- cgraph_varpool_analyze_pending_decls ();
+ /* We finalize local static variables during constructing callgraph
+ edges. Process their attributes too. */
+ process_function_and_variable_attributes (first_processed,
+ first_analyzed_var);
+ first_processed = cgraph_nodes;
+ first_analyzed_var = varpool_nodes;
+ varpool_analyze_pending_decls ();
+ cgraph_process_new_functions ();
}
/* Collect entry points to the unit. */
-
if (cgraph_dump_file)
{
fprintf (cgraph_dump_file, "Unit entry points:");
if (cgraph_dump_file)
fprintf (cgraph_dump_file, "\nReclaiming functions:");
- for (node = cgraph_nodes; node != first_analyzed; node = node->next)
+ for (node = cgraph_nodes; node != first_analyzed; node = next)
{
tree decl = node->decl;
+ next = node->next;
if (node->local.finalized && !DECL_SAVED_TREE (decl))
- cgraph_reset_node (node);
+ cgraph_reset_node (node);
if (!node->reachable && DECL_SAVED_TREE (decl))
{
}
first_analyzed = cgraph_nodes;
ggc_collect ();
+}
+
+/* Analyze the whole compilation unit once it is parsed completely. */
+
+void
+cgraph_finalize_compilation_unit (void)
+{
+ if (errorcount || sorrycount)
+ return;
+
+ finish_aliases_1 ();
+
+ if (!flag_unit_at_a_time)
+ {
+ cgraph_output_pending_asms ();
+ cgraph_assemble_pending_functions ();
+ varpool_output_debug_info ();
+ return;
+ }
+
+ if (!quiet_flag)
+ {
+ fprintf (stderr, "\nAnalyzing compilation unit\n");
+ fflush (stderr);
+ }
+
+ timevar_push (TV_CGRAPH);
+ cgraph_analyze_functions ();
timevar_pop (TV_CGRAPH);
}
/* Figure out what functions we want to assemble. */
{
tree decl = node->decl;
struct cgraph_edge *e;
-
+
gcc_assert (!node->output);
for (e = node->callers; e; e = e->next_caller)
|| DECL_EXTERNAL (decl));
}
-
+
}
}
static void
cgraph_expand_function (struct cgraph_node *node)
{
+ enum debug_info_type save_write_symbols = NO_DEBUG;
+ const struct gcc_debug_hooks *save_debug_hooks = NULL;
tree decl = node->decl;
/* We ought to not compile any inline clones. */
if (flag_unit_at_a_time)
announce_function (decl);
- cgraph_lower_function (node);
+ gcc_assert (node->lowered);
+
+ if (DECL_IGNORED_P (decl))
+ {
+ save_write_symbols = write_symbols;
+ write_symbols = NO_DEBUG;
+ save_debug_hooks = debug_hooks;
+ debug_hooks = &do_nothing_debug_hooks;
+ }
/* Generate RTL for the body of DECL. */
lang_hooks.callgraph.expand_function (decl);
/* ??? Can happen with nested function of extern inline. */
gcc_assert (TREE_ASM_WRITTEN (node->decl));
+ if (DECL_IGNORED_P (decl))
+ {
+ write_symbols = save_write_symbols;
+ debug_hooks = save_debug_hooks;
+ }
+
current_function_decl = NULL;
if (!cgraph_preserve_function_body_p (node->decl))
{
- DECL_SAVED_TREE (node->decl) = NULL;
- DECL_STRUCT_FUNCTION (node->decl) = NULL;
- DECL_INITIAL (node->decl) = error_mark_node;
+ cgraph_release_function_body (node);
/* Eliminate all call edges. This is important so the call_expr no longer
points to the dead function body. */
cgraph_node_remove_callees (node);
cgraph_expand_all_functions (void)
{
struct cgraph_node *node;
- struct cgraph_node **order =
- xcalloc (cgraph_n_nodes, sizeof (struct cgraph_node *));
+ struct cgraph_node **order = XCNEWVEC (struct cgraph_node *, cgraph_n_nodes);
int order_pos = 0, new_order_pos = 0;
int i;
cgraph_expand_function (node);
}
}
+ cgraph_process_new_functions ();
+
free (order);
+
}
-/* Mark visibility of all functions.
-
- A local function is one whose calls can occur only in the current
- compilation unit and all its calls are explicit, so we can change
- its calling convention. We simply mark all static functions whose
- address is not taken as local.
+/* This is used to sort the node types by the cgraph order number. */
+
+struct cgraph_order_sort
+{
+ enum { ORDER_UNDEFINED = 0, ORDER_FUNCTION, ORDER_VAR, ORDER_ASM } kind;
+ union
+ {
+ struct cgraph_node *f;
+ struct varpool_node *v;
+ struct cgraph_asm_node *a;
+ } u;
+};
- We also change the TREE_PUBLIC flag of all declarations that are public
- in language point of view but we want to overwrite this default
- via visibilities for the backend point of view. */
+/* Output all functions, variables, and asm statements in the order
+ according to their order fields, which is the order in which they
+ appeared in the file. This implements -fno-toplevel-reorder. In
+ this mode we may output functions and variables which don't really
+ need to be output. */
static void
-cgraph_function_and_variable_visibility (void)
+cgraph_output_in_order (void)
{
- struct cgraph_node *node;
- struct cgraph_varpool_node *vnode;
+ int max;
+ size_t size;
+ struct cgraph_order_sort *nodes;
+ int i;
+ struct cgraph_node *pf;
+ struct varpool_node *pv;
+ struct cgraph_asm_node *pa;
- for (node = cgraph_nodes; node; node = node->next)
+ max = cgraph_order;
+ size = max * sizeof (struct cgraph_order_sort);
+ nodes = (struct cgraph_order_sort *) alloca (size);
+ memset (nodes, 0, size);
+
+ varpool_analyze_pending_decls ();
+
+ for (pf = cgraph_nodes; pf; pf = pf->next)
{
- if (node->reachable
- && (DECL_COMDAT (node->decl)
- || (!flag_whole_program
- && TREE_PUBLIC (node->decl) && !DECL_EXTERNAL (node->decl))))
- node->local.externally_visible = true;
- if (!node->local.externally_visible && node->analyzed
- && !DECL_EXTERNAL (node->decl))
+ if (pf->output)
{
- gcc_assert (flag_whole_program || !TREE_PUBLIC (node->decl));
- TREE_PUBLIC (node->decl) = 0;
+ i = pf->order;
+ gcc_assert (nodes[i].kind == ORDER_UNDEFINED);
+ nodes[i].kind = ORDER_FUNCTION;
+ nodes[i].u.f = pf;
}
- node->local.local = (!node->needed
- && node->analyzed
- && !DECL_EXTERNAL (node->decl)
- && !node->local.externally_visible);
}
- for (vnode = cgraph_varpool_nodes_queue; vnode; vnode = vnode->next_needed)
+
+ for (pv = varpool_nodes_queue; pv; pv = pv->next_needed)
{
- if (vnode->needed
- && !flag_whole_program
- && (DECL_COMDAT (vnode->decl) || TREE_PUBLIC (vnode->decl)))
- vnode->externally_visible = 1;
- if (!vnode->externally_visible)
- {
- gcc_assert (flag_whole_program || !TREE_PUBLIC (vnode->decl));
- TREE_PUBLIC (vnode->decl) = 0;
- }
- gcc_assert (TREE_STATIC (vnode->decl));
+ i = pv->order;
+ gcc_assert (nodes[i].kind == ORDER_UNDEFINED);
+ nodes[i].kind = ORDER_VAR;
+ nodes[i].u.v = pv;
}
- /* Because we have to be conservative on the boundaries of source
- level units, it is possible that we marked some functions in
- reachable just because they might be used later via external
- linkage, but after making them local they are really unreachable
- now. */
- cgraph_remove_unreachable_nodes (true, cgraph_dump_file);
+ for (pa = cgraph_asm_nodes; pa; pa = pa->next)
+ {
+ i = pa->order;
+ gcc_assert (nodes[i].kind == ORDER_UNDEFINED);
+ nodes[i].kind = ORDER_ASM;
+ nodes[i].u.a = pa;
+ }
- if (cgraph_dump_file)
+ for (i = 0; i < max; ++i)
{
- fprintf (cgraph_dump_file, "\nMarking local functions:");
- for (node = cgraph_nodes; node; node = node->next)
- if (node->local.local)
- fprintf (cgraph_dump_file, " %s", cgraph_node_name (node));
- fprintf (cgraph_dump_file, "\n\n");
- fprintf (cgraph_dump_file, "\nMarking externally visible functions:");
- for (node = cgraph_nodes; node; node = node->next)
- if (node->local.externally_visible)
- fprintf (cgraph_dump_file, " %s", cgraph_node_name (node));
- fprintf (cgraph_dump_file, "\n\n");
+ switch (nodes[i].kind)
+ {
+ case ORDER_FUNCTION:
+ nodes[i].u.f->output = 0;
+ cgraph_expand_function (nodes[i].u.f);
+ break;
+
+ case ORDER_VAR:
+ varpool_assemble_decl (nodes[i].u.v);
+ break;
+
+ case ORDER_ASM:
+ assemble_asm (nodes[i].u.a->asm_str);
+ break;
+
+ case ORDER_UNDEFINED:
+ break;
+
+ default:
+ gcc_unreachable ();
+ }
}
- cgraph_function_flags_ready = true;
+
+ cgraph_asm_nodes = NULL;
}
/* Return true when function body of DECL still needs to be kept around
cgraph_preserve_function_body_p (tree decl)
{
struct cgraph_node *node;
- /* Keep the body; we're going to dump it. */
- if (dump_enabled_p (TDI_tree_all))
- return true;
if (!cgraph_global_info_ready)
- return (DECL_INLINE (decl) && !flag_really_no_inline);
+ return (flag_really_no_inline
+ ? lang_hooks.tree_inlining.disregard_inline_limits (decl)
+ : DECL_INLINE (decl));
/* Look if there is any clone around. */
for (node = cgraph_node (decl); node; node = node->next_clone)
if (node->global.inlined_to)
ipa_passes (void)
{
cfun = NULL;
+ current_function_decl = NULL;
tree_register_cfg_hooks ();
bitmap_obstack_initialize (NULL);
execute_ipa_pass_list (all_ipa_passes);
void
cgraph_optimize (void)
{
+ if (errorcount || sorrycount)
+ return;
+
#ifdef ENABLE_CHECKING
verify_cgraph ();
#endif
if (!flag_unit_at_a_time)
{
- cgraph_varpool_assemble_pending_decls ();
+ cgraph_assemble_pending_functions ();
+ cgraph_process_new_functions ();
+ cgraph_state = CGRAPH_STATE_FINISHED;
+ cgraph_output_pending_asms ();
+ varpool_assemble_pending_decls ();
+ varpool_output_debug_info ();
return;
}
- process_pending_assemble_externals ();
-
/* Frontend may output common variables after the unit has been finalized.
It is safe to deal with them here as they are always zero initialized. */
- cgraph_varpool_analyze_pending_decls ();
+ varpool_analyze_pending_decls ();
+ cgraph_analyze_functions ();
timevar_push (TV_CGRAPHOPT);
- if (!quiet_flag)
- fprintf (stderr, "Performing intraprocedural optimizations\n");
-
- cgraph_function_and_variable_visibility ();
- if (cgraph_dump_file)
+ if (pre_ipa_mem_report)
{
- fprintf (cgraph_dump_file, "Marked ");
- dump_cgraph (cgraph_dump_file);
+ fprintf (stderr, "Memory consumption before IPA\n");
+ dump_memory_report (false);
}
- ipa_passes ();
+ if (!quiet_flag)
+ fprintf (stderr, "Performing interprocedural optimizations\n");
+ cgraph_state = CGRAPH_STATE_IPA;
+
+ /* Don't run the IPA passes if there was any error or sorry messages. */
+ if (errorcount == 0 && sorrycount == 0)
+ ipa_passes ();
+
/* This pass remove bodies of extern inline functions we never inlined.
Do this later so other IPA passes see what is really going on. */
cgraph_remove_unreachable_nodes (false, dump_file);
dump_cgraph (cgraph_dump_file);
dump_varpool (cgraph_dump_file);
}
+ if (post_ipa_mem_report)
+ {
+ fprintf (stderr, "Memory consumption after IPA\n");
+ dump_memory_report (false);
+ }
timevar_pop (TV_CGRAPHOPT);
/* Output everything. */
#ifdef ENABLE_CHECKING
verify_cgraph ();
#endif
-
+
cgraph_mark_functions_to_output ();
- cgraph_expand_all_functions ();
- cgraph_varpool_remove_unreferenced_decls ();
- cgraph_varpool_assemble_pending_decls ();
+ cgraph_state = CGRAPH_STATE_EXPANSION;
+ if (!flag_toplevel_reorder)
+ cgraph_output_in_order ();
+ else
+ {
+ cgraph_output_pending_asms ();
+
+ cgraph_expand_all_functions ();
+ varpool_remove_unreferenced_decls ();
+
+ varpool_assemble_pending_decls ();
+ varpool_output_debug_info ();
+ }
+ cgraph_process_new_functions ();
+ cgraph_state = CGRAPH_STATE_FINISHED;
if (cgraph_dump_file)
{
/* Double check that all inline clones are gone and that all
function bodies have been released from memory. */
if (flag_unit_at_a_time
- && !dump_enabled_p (TDI_tree_all)
&& !(sorrycount || errorcount))
{
struct cgraph_node *node;
for (node = cgraph_nodes; node; node = node->next)
if (node->analyzed
&& (node->global.inlined_to
- || DECL_SAVED_TREE (node->decl)))
+ || DECL_SAVED_TREE (node->decl)))
{
error_found = true;
dump_cgraph_node (stderr, node);
- }
+ }
if (error_found)
internal_error ("nodes with no released memory found");
}
#endif
}
-
/* Generate and emit a static constructor or destructor. WHICH must be
- one of 'I' or 'D'. BODY should be a STATEMENT_LIST containing
+ one of 'I' or 'D'. BODY should be a STATEMENT_LIST containing
GENERIC statements. */
void
tree decl, name, resdecl;
sprintf (which_buf, "%c_%d", which, counter++);
- name = get_file_function_name_long (which_buf);
+ name = get_file_function_name (which_buf);
decl = build_decl (FUNCTION_DECL, name,
build_function_type (void_type_node, void_list_node));
gimplify_function_tree (decl);
- /* ??? We will get called LATE in the compilation process. */
- if (cgraph_global_info_ready)
- {
- tree_lowering_passes (decl);
- tree_rest_of_compilation (decl);
- }
- else
- cgraph_finalize_function (decl, 0);
-
+ cgraph_add_new_function (decl, false);
+ cgraph_mark_needed_node (cgraph_node (decl));
+
if (targetm.have_ctors_dtors)
{
void (*fn) (rtx, int);
cgraph_dump_file = dump_begin (TDI_cgraph, NULL);
}
-/* The edges representing the callers of the NEW_VERSION node were
+/* 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. */
for (e = new_version->callers; e; e = e->next_caller)
/* Update the call expr on the edges
to call the new version. */
- TREE_OPERAND (TREE_OPERAND (get_call_expr_in (e->call_stmt), 0), 0) = new_version->decl;
+ TREE_OPERAND (CALL_EXPR_FN (get_call_expr_in (e->call_stmt)), 0) = new_version->decl;
}
static struct cgraph_node *
cgraph_copy_node_for_versioning (struct cgraph_node *old_version,
- tree new_decl, varray_type redirect_callers)
+ tree new_decl,
+ VEC(cgraph_edge_p,heap) *redirect_callers)
{
struct cgraph_node *new_version;
struct cgraph_edge *e, *new_e;
unsigned i;
gcc_assert (old_version);
-
+
new_version = cgraph_node (new_decl);
new_version->analyzed = true;
also cloned. */
for (e = old_version->callees;e; e=e->next_callee)
{
- new_e = cgraph_clone_edge (e, new_version, e->call_stmt, 0, e->loop_nest, true);
+ new_e = cgraph_clone_edge (e, new_version, e->call_stmt, 0, e->frequency,
+ e->loop_nest, true);
new_e->count = e->count;
}
/* Fix recursive calls.
next_callee = e->next_callee;
if (e->callee == old_version)
cgraph_redirect_edge_callee (e, new_version);
-
+
if (!next_callee)
break;
}
- if (redirect_callers)
- for (i = 0; i < VARRAY_ACTIVE_SIZE (redirect_callers); i++)
- {
- e = VARRAY_GENERIC_PTR (redirect_callers, i);
- /* Redirect calls to the old version node
- to point to it's new version. */
- cgraph_redirect_edge_callee (e, new_version);
- }
+ for (i = 0; VEC_iterate (cgraph_edge_p, redirect_callers, i, e); i++)
+ {
+ /* Redirect calls to the old version node to point to its new
+ version. */
+ cgraph_redirect_edge_callee (e, new_version);
+ }
return new_version;
}
/* Perform function versioning.
- Function versioning includes copying of the tree and
+ Function versioning includes copying of the tree and
a callgraph update (creating a new cgraph node and updating
its callees and callers).
struct cgraph_node *
cgraph_function_versioning (struct cgraph_node *old_version_node,
- varray_type redirect_callers,
+ VEC(cgraph_edge_p,heap) *redirect_callers,
varray_type tree_map)
{
tree old_decl = old_version_node->decl;
redirect_callers);
/* Copy the OLD_VERSION_NODE function tree to the new version. */
- tree_function_versioning (old_decl, new_decl, tree_map);
+ tree_function_versioning (old_decl, new_decl, tree_map, false);
/* Update the call_expr on the edges to call the new version node. */
update_call_expr (new_version_node);
- /* Update the new version's properties.
+ /* Update the new version's properties.
Make The new version visible only within this translation unit.
- ??? We cannot use COMDAT linkage because there is no
+ ??? We cannot use COMDAT linkage because there is no
ABI support for this. */
DECL_EXTERNAL (new_version_node->decl) = 0;
DECL_ONE_ONLY (new_version_node->decl) = 0;
new_version_node->lowered = true;
return new_version_node;
}
+
+/* Produce separate function body for inline clones so the offline copy can be
+ modified without affecting them. */
+struct cgraph_node *
+save_inline_function_body (struct cgraph_node *node)
+{
+ struct cgraph_node *first_clone;
+
+ gcc_assert (node == cgraph_node (node->decl));
+
+ cgraph_lower_function (node);
+
+ /* In non-unit-at-a-time we construct full fledged clone we never output to
+ assembly file. This clone is pointed out by inline_decl of original function
+ and inlining infrastructure knows how to deal with this. */
+ if (!flag_unit_at_a_time)
+ {
+ struct cgraph_edge *e;
+
+ first_clone = cgraph_clone_node (node, node->count, 0, CGRAPH_FREQ_BASE,
+ false);
+ first_clone->needed = 0;
+ first_clone->reachable = 1;
+ /* Recursively clone all bodies. */
+ for (e = first_clone->callees; e; e = e->next_callee)
+ if (!e->inline_failed)
+ cgraph_clone_inlined_nodes (e, true, false);
+ }
+ else
+ first_clone = node->next_clone;
+
+ first_clone->decl = copy_node (node->decl);
+ node->next_clone = NULL;
+ if (!flag_unit_at_a_time)
+ node->inline_decl = first_clone->decl;
+ first_clone->prev_clone = NULL;
+ cgraph_insert_node_to_hashtable (first_clone);
+ gcc_assert (first_clone == cgraph_node (first_clone->decl));
+
+ /* Copy the OLD_VERSION_NODE function tree to the new version. */
+ tree_function_versioning (node->decl, first_clone->decl, NULL, true);
+
+ DECL_EXTERNAL (first_clone->decl) = 0;
+ DECL_ONE_ONLY (first_clone->decl) = 0;
+ TREE_PUBLIC (first_clone->decl) = 0;
+ DECL_COMDAT (first_clone->decl) = 0;
+
+ for (node = first_clone->next_clone; node; node = node->next_clone)
+ node->decl = first_clone->decl;
+#ifdef ENABLE_CHECKING
+ verify_cgraph_node (first_clone);
+#endif
+ return first_clone;
+}
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