/* Language-independent node constructors for parse phase of GNU compiler. Copyright (C) 1987, 88, 92-98, 1999 Free Software Foundation, Inc. This file is part of GNU CC. GNU CC 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 2, or (at your option) any later version. GNU CC 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 GNU CC; see the file COPYING. If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* This file contains the low level primitives for operating on tree nodes, including allocation, list operations, interning of identifiers, construction of data type nodes and statement nodes, and construction of type conversion nodes. It also contains tables index by tree code that describe how to take apart nodes of that code. It is intended to be language-independent, but occasionally calls language-dependent routines defined (for C) in typecheck.c. The low-level allocation routines oballoc and permalloc are used also for allocating many other kinds of objects by all passes of the compiler. */ #include "config.h" #include "system.h" #include #include "flags.h" #include "tree.h" #include "except.h" #include "function.h" #include "obstack.h" #include "toplev.h" #define obstack_chunk_alloc xmalloc #define obstack_chunk_free free /* obstack.[ch] explicitly declined to prototype this. */ extern int _obstack_allocated_p PROTO ((struct obstack *h, GENERIC_PTR obj)); /* Tree nodes of permanent duration are allocated in this obstack. They are the identifier nodes, and everything outside of the bodies and parameters of function definitions. */ struct obstack permanent_obstack; /* The initial RTL, and all ..._TYPE nodes, in a function are allocated in this obstack. Usually they are freed at the end of the function, but if the function is inline they are saved. For top-level functions, this is maybepermanent_obstack. Separate obstacks are made for nested functions. */ struct obstack *function_maybepermanent_obstack; /* This is the function_maybepermanent_obstack for top-level functions. */ struct obstack maybepermanent_obstack; /* This is a list of function_maybepermanent_obstacks for top-level inline functions that are compiled in the middle of compiling other functions. */ struct simple_obstack_stack *toplev_inline_obstacks; /* Former elements of toplev_inline_obstacks that have been recycled. */ struct simple_obstack_stack *extra_inline_obstacks; /* This is a list of function_maybepermanent_obstacks for inline functions nested in the current function that were compiled in the middle of compiling other functions. */ struct simple_obstack_stack *inline_obstacks; /* The contents of the current function definition are allocated in this obstack, and all are freed at the end of the function. For top-level functions, this is temporary_obstack. Separate obstacks are made for nested functions. */ struct obstack *function_obstack; /* This is used for reading initializers of global variables. */ struct obstack temporary_obstack; /* The tree nodes of an expression are allocated in this obstack, and all are freed at the end of the expression. */ struct obstack momentary_obstack; /* The tree nodes of a declarator are allocated in this obstack, and all are freed when the declarator has been parsed. */ static struct obstack temp_decl_obstack; /* This points at either permanent_obstack or the current function_maybepermanent_obstack. */ struct obstack *saveable_obstack; /* This is same as saveable_obstack during parse and expansion phase; it points to the current function's obstack during optimization. This is the obstack to be used for creating rtl objects. */ struct obstack *rtl_obstack; /* This points at either permanent_obstack or the current function_obstack. */ struct obstack *current_obstack; /* This points at either permanent_obstack or the current function_obstack or momentary_obstack. */ struct obstack *expression_obstack; /* Stack of obstack selections for push_obstacks and pop_obstacks. */ struct obstack_stack { struct obstack_stack *next; struct obstack *current; struct obstack *saveable; struct obstack *expression; struct obstack *rtl; }; struct obstack_stack *obstack_stack; /* Obstack for allocating struct obstack_stack entries. */ static struct obstack obstack_stack_obstack; /* Addresses of first objects in some obstacks. This is for freeing their entire contents. */ char *maybepermanent_firstobj; char *temporary_firstobj; char *momentary_firstobj; char *temp_decl_firstobj; /* This is used to preserve objects (mainly array initializers) that need to live until the end of the current function, but no further. */ char *momentary_function_firstobj; /* Nonzero means all ..._TYPE nodes should be allocated permanently. */ int all_types_permanent; /* Stack of places to restore the momentary obstack back to. */ struct momentary_level { /* Pointer back to previous such level. */ struct momentary_level *prev; /* First object allocated within this level. */ char *base; /* Value of expression_obstack saved at entry to this level. */ struct obstack *obstack; }; struct momentary_level *momentary_stack; /* Table indexed by tree code giving a string containing a character classifying the tree code. Possibilities are t, d, s, c, r, <, 1, 2 and e. See tree.def for details. */ #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE, char tree_code_type[MAX_TREE_CODES] = { #include "tree.def" }; #undef DEFTREECODE /* Table indexed by tree code giving number of expression operands beyond the fixed part of the node structure. Not used for types or decls. */ #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH, int tree_code_length[MAX_TREE_CODES] = { #include "tree.def" }; #undef DEFTREECODE /* Names of tree components. Used for printing out the tree and error messages. */ #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME, char *tree_code_name[MAX_TREE_CODES] = { #include "tree.def" }; #undef DEFTREECODE /* Statistics-gathering stuff. */ typedef enum { d_kind, t_kind, b_kind, s_kind, r_kind, e_kind, c_kind, id_kind, op_id_kind, perm_list_kind, temp_list_kind, vec_kind, x_kind, lang_decl, lang_type, all_kinds } tree_node_kind; int tree_node_counts[(int)all_kinds]; int tree_node_sizes[(int)all_kinds]; int id_string_size = 0; char *tree_node_kind_names[] = { "decls", "types", "blocks", "stmts", "refs", "exprs", "constants", "identifiers", "op_identifiers", "perm_tree_lists", "temp_tree_lists", "vecs", "random kinds", "lang_decl kinds", "lang_type kinds" }; /* Hash table for uniquizing IDENTIFIER_NODEs by name. */ #define MAX_HASH_TABLE 1009 static tree hash_table[MAX_HASH_TABLE]; /* id hash buckets */ /* 0 while creating built-in identifiers. */ static int do_identifier_warnings; /* Unique id for next decl created. */ static int next_decl_uid; /* Unique id for next type created. */ static int next_type_uid = 1; /* The language-specific function for alias analysis. If NULL, the language does not do any special alias analysis. */ int (*lang_get_alias_set) PROTO((tree)); /* Here is how primitive or already-canonicalized types' hash codes are made. */ #define TYPE_HASH(TYPE) ((unsigned long) (TYPE) & 0777777) static void set_type_quals PROTO((tree, int)); static void append_random_chars PROTO((char *)); extern char *mode_name[]; void gcc_obstack_init (); /* Init the principal obstacks. */ void init_obstacks () { gcc_obstack_init (&obstack_stack_obstack); gcc_obstack_init (&permanent_obstack); gcc_obstack_init (&temporary_obstack); temporary_firstobj = (char *) obstack_alloc (&temporary_obstack, 0); gcc_obstack_init (&momentary_obstack); momentary_firstobj = (char *) obstack_alloc (&momentary_obstack, 0); momentary_function_firstobj = momentary_firstobj; gcc_obstack_init (&maybepermanent_obstack); maybepermanent_firstobj = (char *) obstack_alloc (&maybepermanent_obstack, 0); gcc_obstack_init (&temp_decl_obstack); temp_decl_firstobj = (char *) obstack_alloc (&temp_decl_obstack, 0); function_obstack = &temporary_obstack; function_maybepermanent_obstack = &maybepermanent_obstack; current_obstack = &permanent_obstack; expression_obstack = &permanent_obstack; rtl_obstack = saveable_obstack = &permanent_obstack; /* Init the hash table of identifiers. */ bzero ((char *) hash_table, sizeof hash_table); } void gcc_obstack_init (obstack) struct obstack *obstack; { /* Let particular systems override the size of a chunk. */ #ifndef OBSTACK_CHUNK_SIZE #define OBSTACK_CHUNK_SIZE 0 #endif /* Let them override the alloc and free routines too. */ #ifndef OBSTACK_CHUNK_ALLOC #define OBSTACK_CHUNK_ALLOC xmalloc #endif #ifndef OBSTACK_CHUNK_FREE #define OBSTACK_CHUNK_FREE free #endif _obstack_begin (obstack, OBSTACK_CHUNK_SIZE, 0, (void *(*) ()) OBSTACK_CHUNK_ALLOC, (void (*) ()) OBSTACK_CHUNK_FREE); } /* Save all variables describing the current status into the structure *P. This is used before starting a nested function. CONTEXT is the decl_function_context for the function we're about to compile; if it isn't current_function_decl, we have to play some games. */ void save_tree_status (p, context) struct function *p; tree context; { p->all_types_permanent = all_types_permanent; p->momentary_stack = momentary_stack; p->maybepermanent_firstobj = maybepermanent_firstobj; p->temporary_firstobj = temporary_firstobj; p->momentary_firstobj = momentary_firstobj; p->momentary_function_firstobj = momentary_function_firstobj; p->function_obstack = function_obstack; p->function_maybepermanent_obstack = function_maybepermanent_obstack; p->current_obstack = current_obstack; p->expression_obstack = expression_obstack; p->saveable_obstack = saveable_obstack; p->rtl_obstack = rtl_obstack; p->inline_obstacks = inline_obstacks; if (context == current_function_decl) /* Objects that need to be saved in this function can be in the nonsaved obstack of the enclosing function since they can't possibly be needed once it has returned. */ function_maybepermanent_obstack = function_obstack; else { /* We're compiling a function which isn't nested in the current function. We need to create a new maybepermanent_obstack for this function, since it can't go onto any of the existing obstacks. */ struct simple_obstack_stack **head; struct simple_obstack_stack *current; if (context == NULL_TREE) head = &toplev_inline_obstacks; else { struct function *f = find_function_data (context); head = &f->inline_obstacks; } if (context == NULL_TREE && extra_inline_obstacks) { current = extra_inline_obstacks; extra_inline_obstacks = current->next; } else { current = ((struct simple_obstack_stack *) xmalloc (sizeof (struct simple_obstack_stack))); current->obstack = (struct obstack *) xmalloc (sizeof (struct obstack)); gcc_obstack_init (current->obstack); } function_maybepermanent_obstack = current->obstack; current->next = *head; *head = current; } maybepermanent_firstobj = (char *) obstack_finish (function_maybepermanent_obstack); function_obstack = (struct obstack *) xmalloc (sizeof (struct obstack)); gcc_obstack_init (function_obstack); current_obstack = &permanent_obstack; expression_obstack = &permanent_obstack; rtl_obstack = saveable_obstack = &permanent_obstack; temporary_firstobj = (char *) obstack_alloc (&temporary_obstack, 0); momentary_firstobj = (char *) obstack_finish (&momentary_obstack); momentary_function_firstobj = momentary_firstobj; } /* Restore all variables describing the current status from the structure *P. This is used after a nested function. */ void restore_tree_status (p, context) struct function *p; tree context; { all_types_permanent = p->all_types_permanent; momentary_stack = p->momentary_stack; obstack_free (&momentary_obstack, momentary_function_firstobj); /* Free saveable storage used by the function just compiled and not saved. CAUTION: This is in function_obstack of the containing function. So we must be sure that we never allocate from that obstack during the compilation of a nested function if we expect it to survive past the nested function's end. */ obstack_free (function_maybepermanent_obstack, maybepermanent_firstobj); /* If we were compiling a toplevel function, we can free this space now. */ if (context == NULL_TREE) { obstack_free (&temporary_obstack, temporary_firstobj); obstack_free (&momentary_obstack, momentary_function_firstobj); } /* If we were compiling a toplevel function that we don't actually want to save anything from, return the obstack to the pool. */ if (context == NULL_TREE && obstack_empty_p (function_maybepermanent_obstack)) { struct simple_obstack_stack *current, **p = &toplev_inline_obstacks; if ((*p) != NULL) { while ((*p)->obstack != function_maybepermanent_obstack) p = &((*p)->next); current = *p; *p = current->next; current->next = extra_inline_obstacks; extra_inline_obstacks = current; } } obstack_free (function_obstack, 0); free (function_obstack); temporary_firstobj = p->temporary_firstobj; momentary_firstobj = p->momentary_firstobj; momentary_function_firstobj = p->momentary_function_firstobj; maybepermanent_firstobj = p->maybepermanent_firstobj; function_obstack = p->function_obstack; function_maybepermanent_obstack = p->function_maybepermanent_obstack; current_obstack = p->current_obstack; expression_obstack = p->expression_obstack; saveable_obstack = p->saveable_obstack; rtl_obstack = p->rtl_obstack; inline_obstacks = p->inline_obstacks; } /* Start allocating on the temporary (per function) obstack. This is done in start_function before parsing the function body, and before each initialization at top level, and to go back to temporary allocation after doing permanent_allocation. */ void temporary_allocation () { /* Note that function_obstack at top level points to temporary_obstack. But within a nested function context, it is a separate obstack. */ current_obstack = function_obstack; expression_obstack = function_obstack; rtl_obstack = saveable_obstack = function_maybepermanent_obstack; momentary_stack = 0; inline_obstacks = 0; } /* Start allocating on the permanent obstack but don't free the temporary data. After calling this, call `permanent_allocation' to fully resume permanent allocation status. */ void end_temporary_allocation () { current_obstack = &permanent_obstack; expression_obstack = &permanent_obstack; rtl_obstack = saveable_obstack = &permanent_obstack; } /* Resume allocating on the temporary obstack, undoing effects of `end_temporary_allocation'. */ void resume_temporary_allocation () { current_obstack = function_obstack; expression_obstack = function_obstack; rtl_obstack = saveable_obstack = function_maybepermanent_obstack; } /* While doing temporary allocation, switch to allocating in such a way as to save all nodes if the function is inlined. Call resume_temporary_allocation to go back to ordinary temporary allocation. */ void saveable_allocation () { /* Note that function_obstack at top level points to temporary_obstack. But within a nested function context, it is a separate obstack. */ expression_obstack = current_obstack = saveable_obstack; } /* Switch to current obstack CURRENT and maybepermanent obstack SAVEABLE, recording the previously current obstacks on a stack. This does not free any storage in any obstack. */ void push_obstacks (current, saveable) struct obstack *current, *saveable; { struct obstack_stack *p = (struct obstack_stack *) obstack_alloc (&obstack_stack_obstack, (sizeof (struct obstack_stack))); p->current = current_obstack; p->saveable = saveable_obstack; p->expression = expression_obstack; p->rtl = rtl_obstack; p->next = obstack_stack; obstack_stack = p; current_obstack = current; expression_obstack = current; rtl_obstack = saveable_obstack = saveable; } /* Save the current set of obstacks, but don't change them. */ void push_obstacks_nochange () { struct obstack_stack *p = (struct obstack_stack *) obstack_alloc (&obstack_stack_obstack, (sizeof (struct obstack_stack))); p->current = current_obstack; p->saveable = saveable_obstack; p->expression = expression_obstack; p->rtl = rtl_obstack; p->next = obstack_stack; obstack_stack = p; } /* Pop the obstack selection stack. */ void pop_obstacks () { struct obstack_stack *p = obstack_stack; obstack_stack = p->next; current_obstack = p->current; saveable_obstack = p->saveable; expression_obstack = p->expression; rtl_obstack = p->rtl; obstack_free (&obstack_stack_obstack, p); } /* Nonzero if temporary allocation is currently in effect. Zero if currently doing permanent allocation. */ int allocation_temporary_p () { return current_obstack != &permanent_obstack; } /* Go back to allocating on the permanent obstack and free everything in the temporary obstack. FUNCTION_END is true only if we have just finished compiling a function. In that case, we also free preserved initial values on the momentary obstack. */ void permanent_allocation (function_end) int function_end; { /* Free up previous temporary obstack data */ obstack_free (&temporary_obstack, temporary_firstobj); if (function_end) { obstack_free (&momentary_obstack, momentary_function_firstobj); momentary_firstobj = momentary_function_firstobj; } else obstack_free (&momentary_obstack, momentary_firstobj); obstack_free (function_maybepermanent_obstack, maybepermanent_firstobj); obstack_free (&temp_decl_obstack, temp_decl_firstobj); /* Free up the maybepermanent_obstacks for any of our nested functions which were compiled at a lower level. */ while (inline_obstacks) { struct simple_obstack_stack *current = inline_obstacks; inline_obstacks = current->next; obstack_free (current->obstack, 0); free (current->obstack); free (current); } current_obstack = &permanent_obstack; expression_obstack = &permanent_obstack; rtl_obstack = saveable_obstack = &permanent_obstack; } /* Save permanently everything on the maybepermanent_obstack. */ void preserve_data () { maybepermanent_firstobj = (char *) obstack_alloc (function_maybepermanent_obstack, 0); } void preserve_initializer () { struct momentary_level *tem; char *old_momentary; temporary_firstobj = (char *) obstack_alloc (&temporary_obstack, 0); maybepermanent_firstobj = (char *) obstack_alloc (function_maybepermanent_obstack, 0); old_momentary = momentary_firstobj; momentary_firstobj = (char *) obstack_alloc (&momentary_obstack, 0); if (momentary_firstobj != old_momentary) for (tem = momentary_stack; tem; tem = tem->prev) tem->base = momentary_firstobj; } /* Start allocating new rtl in current_obstack. Use resume_temporary_allocation to go back to allocating rtl in saveable_obstack. */ void rtl_in_current_obstack () { rtl_obstack = current_obstack; } /* Start allocating rtl from saveable_obstack. Intended to be used after a call to push_obstacks_nochange. */ void rtl_in_saveable_obstack () { rtl_obstack = saveable_obstack; } /* Allocate SIZE bytes in the current obstack and return a pointer to them. In practice the current obstack is always the temporary one. */ char * oballoc (size) int size; { return (char *) obstack_alloc (current_obstack, size); } /* Free the object PTR in the current obstack as well as everything allocated since PTR. In practice the current obstack is always the temporary one. */ void obfree (ptr) char *ptr; { obstack_free (current_obstack, ptr); } /* Allocate SIZE bytes in the permanent obstack and return a pointer to them. */ char * permalloc (size) int size; { return (char *) obstack_alloc (&permanent_obstack, size); } /* Allocate NELEM items of SIZE bytes in the permanent obstack and return a pointer to them. The storage is cleared before returning the value. */ char * perm_calloc (nelem, size) int nelem; long size; { char *rval = (char *) obstack_alloc (&permanent_obstack, nelem * size); bzero (rval, nelem * size); return rval; } /* Allocate SIZE bytes in the saveable obstack and return a pointer to them. */ char * savealloc (size) int size; { return (char *) obstack_alloc (saveable_obstack, size); } /* Allocate SIZE bytes in the expression obstack and return a pointer to them. */ char * expralloc (size) int size; { return (char *) obstack_alloc (expression_obstack, size); } /* Print out which obstack an object is in. */ void print_obstack_name (object, file, prefix) char *object; FILE *file; char *prefix; { struct obstack *obstack = NULL; char *obstack_name = NULL; struct function *p; for (p = outer_function_chain; p; p = p->next) { if (_obstack_allocated_p (p->function_obstack, object)) { obstack = p->function_obstack; obstack_name = "containing function obstack"; } if (_obstack_allocated_p (p->function_maybepermanent_obstack, object)) { obstack = p->function_maybepermanent_obstack; obstack_name = "containing function maybepermanent obstack"; } } if (_obstack_allocated_p (&obstack_stack_obstack, object)) { obstack = &obstack_stack_obstack; obstack_name = "obstack_stack_obstack"; } else if (_obstack_allocated_p (function_obstack, object)) { obstack = function_obstack; obstack_name = "function obstack"; } else if (_obstack_allocated_p (&permanent_obstack, object)) { obstack = &permanent_obstack; obstack_name = "permanent_obstack"; } else if (_obstack_allocated_p (&momentary_obstack, object)) { obstack = &momentary_obstack; obstack_name = "momentary_obstack"; } else if (_obstack_allocated_p (function_maybepermanent_obstack, object)) { obstack = function_maybepermanent_obstack; obstack_name = "function maybepermanent obstack"; } else if (_obstack_allocated_p (&temp_decl_obstack, object)) { obstack = &temp_decl_obstack; obstack_name = "temp_decl_obstack"; } /* Check to see if the object is in the free area of the obstack. */ if (obstack != NULL) { if (object >= obstack->next_free && object < obstack->chunk_limit) fprintf (file, "%s in free portion of obstack %s", prefix, obstack_name); else fprintf (file, "%s allocated from %s", prefix, obstack_name); } else fprintf (file, "%s not allocated from any obstack", prefix); } void debug_obstack (object) char *object; { print_obstack_name (object, stderr, "object"); fprintf (stderr, ".\n"); } /* Return 1 if OBJ is in the permanent obstack. This is slow, and should be used only for debugging. Use TREE_PERMANENT for other purposes. */ int object_permanent_p (obj) tree obj; { return _obstack_allocated_p (&permanent_obstack, obj); } /* Start a level of momentary allocation. In C, each compound statement has its own level and that level is freed at the end of each statement. All expression nodes are allocated in the momentary allocation level. */ void push_momentary () { struct momentary_level *tem = (struct momentary_level *) obstack_alloc (&momentary_obstack, sizeof (struct momentary_level)); tem->prev = momentary_stack; tem->base = (char *) obstack_base (&momentary_obstack); tem->obstack = expression_obstack; momentary_stack = tem; expression_obstack = &momentary_obstack; } /* Set things up so the next clear_momentary will only clear memory past our present position in momentary_obstack. */ void preserve_momentary () { momentary_stack->base = (char *) obstack_base (&momentary_obstack); } /* Free all the storage in the current momentary-allocation level. In C, this happens at the end of each statement. */ void clear_momentary () { obstack_free (&momentary_obstack, momentary_stack->base); } /* Discard a level of momentary allocation. In C, this happens at the end of each compound statement. Restore the status of expression node allocation that was in effect before this level was created. */ void pop_momentary () { struct momentary_level *tem = momentary_stack; momentary_stack = tem->prev; expression_obstack = tem->obstack; /* We can't free TEM from the momentary_obstack, because there might be objects above it which have been saved. We can free back to the stack of the level we are popping off though. */ obstack_free (&momentary_obstack, tem->base); } /* Pop back to the previous level of momentary allocation, but don't free any momentary data just yet. */ void pop_momentary_nofree () { struct momentary_level *tem = momentary_stack; momentary_stack = tem->prev; expression_obstack = tem->obstack; } /* Call when starting to parse a declaration: make expressions in the declaration last the length of the function. Returns an argument that should be passed to resume_momentary later. */ int suspend_momentary () { register int tem = expression_obstack == &momentary_obstack; expression_obstack = saveable_obstack; return tem; } /* Call when finished parsing a declaration: restore the treatment of node-allocation that was in effect before the suspension. YES should be the value previously returned by suspend_momentary. */ void resume_momentary (yes) int yes; { if (yes) expression_obstack = &momentary_obstack; } /* Init the tables indexed by tree code. Note that languages can add to these tables to define their own codes. */ void init_tree_codes () { } /* Return a newly allocated node of code CODE. Initialize the node's unique id and its TREE_PERMANENT flag. For decl and type nodes, some other fields are initialized. The rest of the node is initialized to zero. Achoo! I got a code in the node. */ tree make_node (code) enum tree_code code; { register tree t; register int type = TREE_CODE_CLASS (code); register int length = 0; register struct obstack *obstack = current_obstack; #ifdef GATHER_STATISTICS register tree_node_kind kind; #endif switch (type) { case 'd': /* A decl node */ #ifdef GATHER_STATISTICS kind = d_kind; #endif length = sizeof (struct tree_decl); /* All decls in an inline function need to be saved. */ if (obstack != &permanent_obstack) obstack = saveable_obstack; /* PARM_DECLs go on the context of the parent. If this is a nested function, then we must allocate the PARM_DECL on the parent's obstack, so that they will live to the end of the parent's closing brace. This is necessary in case we try to inline the function into its parent. PARM_DECLs of top-level functions do not have this problem. However, we allocate them where we put the FUNCTION_DECL for languages such as Ada that need to consult some flags in the PARM_DECLs of the function when calling it. See comment in restore_tree_status for why we can't put this in function_obstack. */ if (code == PARM_DECL && obstack != &permanent_obstack) { tree context = 0; if (current_function_decl) context = decl_function_context (current_function_decl); if (context) obstack = find_function_data (context)->function_maybepermanent_obstack; } break; case 't': /* a type node */ #ifdef GATHER_STATISTICS kind = t_kind; #endif length = sizeof (struct tree_type); /* All data types are put where we can preserve them if nec. */ if (obstack != &permanent_obstack) obstack = all_types_permanent ? &permanent_obstack : saveable_obstack; break; case 'b': /* a lexical block */ #ifdef GATHER_STATISTICS kind = b_kind; #endif length = sizeof (struct tree_block); /* All BLOCK nodes are put where we can preserve them if nec. */ if (obstack != &permanent_obstack) obstack = saveable_obstack; break; case 's': /* an expression with side effects */ #ifdef GATHER_STATISTICS kind = s_kind; goto usual_kind; #endif case 'r': /* a reference */ #ifdef GATHER_STATISTICS kind = r_kind; goto usual_kind; #endif case 'e': /* an expression */ case '<': /* a comparison expression */ case '1': /* a unary arithmetic expression */ case '2': /* a binary arithmetic expression */ #ifdef GATHER_STATISTICS kind = e_kind; usual_kind: #endif obstack = expression_obstack; /* All BIND_EXPR nodes are put where we can preserve them if nec. */ if (code == BIND_EXPR && obstack != &permanent_obstack) obstack = saveable_obstack; length = sizeof (struct tree_exp) + (tree_code_length[(int) code] - 1) * sizeof (char *); break; case 'c': /* a constant */ #ifdef GATHER_STATISTICS kind = c_kind; #endif obstack = expression_obstack; /* We can't use tree_code_length for INTEGER_CST, since the number of words is machine-dependent due to varying length of HOST_WIDE_INT, which might be wider than a pointer (e.g., long long). Similarly for REAL_CST, since the number of words is machine-dependent due to varying size and alignment of `double'. */ if (code == INTEGER_CST) length = sizeof (struct tree_int_cst); else if (code == REAL_CST) length = sizeof (struct tree_real_cst); else length = sizeof (struct tree_common) + tree_code_length[(int) code] * sizeof (char *); break; case 'x': /* something random, like an identifier. */ #ifdef GATHER_STATISTICS if (code == IDENTIFIER_NODE) kind = id_kind; else if (code == OP_IDENTIFIER) kind = op_id_kind; else if (code == TREE_VEC) kind = vec_kind; else kind = x_kind; #endif length = sizeof (struct tree_common) + tree_code_length[(int) code] * sizeof (char *); /* Identifier nodes are always permanent since they are unique in a compiler run. */ if (code == IDENTIFIER_NODE) obstack = &permanent_obstack; break; default: abort (); } t = (tree) obstack_alloc (obstack, length); bzero (t, length); #ifdef GATHER_STATISTICS tree_node_counts[(int)kind]++; tree_node_sizes[(int)kind] += length; #endif TREE_SET_CODE (t, code); if (obstack == &permanent_obstack) TREE_PERMANENT (t) = 1; switch (type) { case 's': TREE_SIDE_EFFECTS (t) = 1; TREE_TYPE (t) = void_type_node; break; case 'd': if (code != FUNCTION_DECL) DECL_ALIGN (t) = 1; DECL_IN_SYSTEM_HEADER (t) = in_system_header && (obstack == &permanent_obstack); DECL_SOURCE_LINE (t) = lineno; DECL_SOURCE_FILE (t) = (input_filename) ? input_filename : ""; DECL_UID (t) = next_decl_uid++; /* Note that we have not yet computed the alias set for this declaration. */ DECL_POINTER_ALIAS_SET (t) = -1; break; case 't': TYPE_UID (t) = next_type_uid++; TYPE_ALIGN (t) = 1; TYPE_MAIN_VARIANT (t) = t; TYPE_OBSTACK (t) = obstack; TYPE_ATTRIBUTES (t) = NULL_TREE; #ifdef SET_DEFAULT_TYPE_ATTRIBUTES SET_DEFAULT_TYPE_ATTRIBUTES (t); #endif /* Note that we have not yet computed the alias set for this type. */ TYPE_ALIAS_SET (t) = -1; break; case 'c': TREE_CONSTANT (t) = 1; break; } return t; } /* Return a new node with the same contents as NODE except that its TREE_CHAIN is zero and it has a fresh uid. */ tree copy_node (node) tree node; { register tree t; register enum tree_code code = TREE_CODE (node); register int length = 0; switch (TREE_CODE_CLASS (code)) { case 'd': /* A decl node */ length = sizeof (struct tree_decl); break; case 't': /* a type node */ length = sizeof (struct tree_type); break; case 'b': /* a lexical block node */ length = sizeof (struct tree_block); break; case 'r': /* a reference */ case 'e': /* an expression */ case 's': /* an expression with side effects */ case '<': /* a comparison expression */ case '1': /* a unary arithmetic expression */ case '2': /* a binary arithmetic expression */ length = sizeof (struct tree_exp) + (tree_code_length[(int) code] - 1) * sizeof (char *); break; case 'c': /* a constant */ /* We can't use tree_code_length for INTEGER_CST, since the number of words is machine-dependent due to varying length of HOST_WIDE_INT, which might be wider than a pointer (e.g., long long). Similarly for REAL_CST, since the number of words is machine-dependent due to varying size and alignment of `double'. */ if (code == INTEGER_CST) length = sizeof (struct tree_int_cst); else if (code == REAL_CST) length = sizeof (struct tree_real_cst); else length = (sizeof (struct tree_common) + tree_code_length[(int) code] * sizeof (char *)); break; case 'x': /* something random, like an identifier. */ length = sizeof (struct tree_common) + tree_code_length[(int) code] * sizeof (char *); if (code == TREE_VEC) length += (TREE_VEC_LENGTH (node) - 1) * sizeof (char *); } t = (tree) obstack_alloc (current_obstack, length); memcpy (t, node, length); /* EXPR_WITH_FILE_LOCATION must keep filename info stored in TREE_CHAIN */ if (TREE_CODE (node) != EXPR_WITH_FILE_LOCATION) TREE_CHAIN (t) = 0; TREE_ASM_WRITTEN (t) = 0; if (TREE_CODE_CLASS (code) == 'd') DECL_UID (t) = next_decl_uid++; else if (TREE_CODE_CLASS (code) == 't') { TYPE_UID (t) = next_type_uid++; TYPE_OBSTACK (t) = current_obstack; /* The following is so that the debug code for the copy is different from the original type. The two statements usually duplicate each other (because they clear fields of the same union), but the optimizer should catch that. */ TYPE_SYMTAB_POINTER (t) = 0; TYPE_SYMTAB_ADDRESS (t) = 0; } TREE_PERMANENT (t) = (current_obstack == &permanent_obstack); return t; } /* Return a copy of a chain of nodes, chained through the TREE_CHAIN field. For example, this can copy a list made of TREE_LIST nodes. */ tree copy_list (list) tree list; { tree head; register tree prev, next; if (list == 0) return 0; head = prev = copy_node (list); next = TREE_CHAIN (list); while (next) { TREE_CHAIN (prev) = copy_node (next); prev = TREE_CHAIN (prev); next = TREE_CHAIN (next); } return head; } #define HASHBITS 30 /* Return an IDENTIFIER_NODE whose name is TEXT (a null-terminated string). If an identifier with that name has previously been referred to, the same node is returned this time. */ tree get_identifier (text) register char *text; { register int hi; register int i; register tree idp; register int len, hash_len; /* Compute length of text in len. */ len = strlen (text); /* Decide how much of that length to hash on */ hash_len = len; if (warn_id_clash && (unsigned)len > id_clash_len) hash_len = id_clash_len; /* Compute hash code */ hi = hash_len * 613 + (unsigned) text[0]; for (i = 1; i < hash_len; i += 2) hi = ((hi * 613) + (unsigned) (text[i])); hi &= (1 << HASHBITS) - 1; hi %= MAX_HASH_TABLE; /* Search table for identifier */ for (idp = hash_table[hi]; idp; idp = TREE_CHAIN (idp)) if (IDENTIFIER_LENGTH (idp) == len && IDENTIFIER_POINTER (idp)[0] == text[0] && !bcmp (IDENTIFIER_POINTER (idp), text, len)) return idp; /* <-- return if found */ /* Not found; optionally warn about a similar identifier */ if (warn_id_clash && do_identifier_warnings && (unsigned)len >= id_clash_len) for (idp = hash_table[hi]; idp; idp = TREE_CHAIN (idp)) if (!strncmp (IDENTIFIER_POINTER (idp), text, id_clash_len)) { warning ("`%s' and `%s' identical in first %d characters", IDENTIFIER_POINTER (idp), text, id_clash_len); break; } if (tree_code_length[(int) IDENTIFIER_NODE] < 0) abort (); /* set_identifier_size hasn't been called. */ /* Not found, create one, add to chain */ idp = make_node (IDENTIFIER_NODE); IDENTIFIER_LENGTH (idp) = len; #ifdef GATHER_STATISTICS id_string_size += len; #endif IDENTIFIER_POINTER (idp) = obstack_copy0 (&permanent_obstack, text, len); TREE_CHAIN (idp) = hash_table[hi]; hash_table[hi] = idp; return idp; /* <-- return if created */ } /* If an identifier with the name TEXT (a null-terminated string) has previously been referred to, return that node; otherwise return NULL_TREE. */ tree maybe_get_identifier (text) register char *text; { register int hi; register int i; register tree idp; register int len, hash_len; /* Compute length of text in len. */ len = strlen (text); /* Decide how much of that length to hash on */ hash_len = len; if (warn_id_clash && (unsigned)len > id_clash_len) hash_len = id_clash_len; /* Compute hash code */ hi = hash_len * 613 + (unsigned) text[0]; for (i = 1; i < hash_len; i += 2) hi = ((hi * 613) + (unsigned) (text[i])); hi &= (1 << HASHBITS) - 1; hi %= MAX_HASH_TABLE; /* Search table for identifier */ for (idp = hash_table[hi]; idp; idp = TREE_CHAIN (idp)) if (IDENTIFIER_LENGTH (idp) == len && IDENTIFIER_POINTER (idp)[0] == text[0] && !bcmp (IDENTIFIER_POINTER (idp), text, len)) return idp; /* <-- return if found */ return NULL_TREE; } /* Enable warnings on similar identifiers (if requested). Done after the built-in identifiers are created. */ void start_identifier_warnings () { do_identifier_warnings = 1; } /* Record the size of an identifier node for the language in use. SIZE is the total size in bytes. This is called by the language-specific files. This must be called before allocating any identifiers. */ void set_identifier_size (size) int size; { tree_code_length[(int) IDENTIFIER_NODE] = (size - sizeof (struct tree_common)) / sizeof (tree); } /* Return a newly constructed INTEGER_CST node whose constant value is specified by the two ints LOW and HI. The TREE_TYPE is set to `int'. This function should be used via the `build_int_2' macro. */ tree build_int_2_wide (low, hi) HOST_WIDE_INT low, hi; { register tree t = make_node (INTEGER_CST); TREE_INT_CST_LOW (t) = low; TREE_INT_CST_HIGH (t) = hi; TREE_TYPE (t) = integer_type_node; return t; } /* Return a new REAL_CST node whose type is TYPE and value is D. */ tree build_real (type, d) tree type; REAL_VALUE_TYPE d; { tree v; int overflow = 0; /* Check for valid float value for this type on this target machine; if not, can print error message and store a valid value in D. */ #ifdef CHECK_FLOAT_VALUE CHECK_FLOAT_VALUE (TYPE_MODE (type), d, overflow); #endif v = make_node (REAL_CST); TREE_TYPE (v) = type; TREE_REAL_CST (v) = d; TREE_OVERFLOW (v) = TREE_CONSTANT_OVERFLOW (v) = overflow; return v; } /* Return a new REAL_CST node whose type is TYPE and whose value is the integer value of the INTEGER_CST node I. */ #if !defined (REAL_IS_NOT_DOUBLE) || defined (REAL_ARITHMETIC) REAL_VALUE_TYPE real_value_from_int_cst (type, i) tree type, i; { REAL_VALUE_TYPE d; #ifdef REAL_ARITHMETIC if (! TREE_UNSIGNED (TREE_TYPE (i))) REAL_VALUE_FROM_INT (d, TREE_INT_CST_LOW (i), TREE_INT_CST_HIGH (i), TYPE_MODE (type)); else REAL_VALUE_FROM_UNSIGNED_INT (d, TREE_INT_CST_LOW (i), TREE_INT_CST_HIGH (i), TYPE_MODE (type)); #else /* not REAL_ARITHMETIC */ /* Some 386 compilers mishandle unsigned int to float conversions, so introduce a temporary variable E to avoid those bugs. */ if (TREE_INT_CST_HIGH (i) < 0 && ! TREE_UNSIGNED (TREE_TYPE (i))) { REAL_VALUE_TYPE e; d = (double) (~ TREE_INT_CST_HIGH (i)); e = ((double) ((HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT / 2)) * (double) ((HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT / 2))); d *= e; e = (double) (unsigned HOST_WIDE_INT) (~ TREE_INT_CST_LOW (i)); d += e; d = (- d - 1.0); } else { REAL_VALUE_TYPE e; d = (double) (unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (i); e = ((double) ((HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT / 2)) * (double) ((HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT / 2))); d *= e; e = (double) (unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (i); d += e; } #endif /* not REAL_ARITHMETIC */ return d; } /* This function can't be implemented if we can't do arithmetic on the float representation. */ tree build_real_from_int_cst (type, i) tree type; tree i; { tree v; int overflow = TREE_OVERFLOW (i); REAL_VALUE_TYPE d; jmp_buf float_error; v = make_node (REAL_CST); TREE_TYPE (v) = type; if (setjmp (float_error)) { d = dconst0; overflow = 1; goto got_it; } set_float_handler (float_error); #ifdef REAL_ARITHMETIC d = real_value_from_int_cst (type, i); #else d = REAL_VALUE_TRUNCATE (TYPE_MODE (type), real_value_from_int_cst (type, i)); #endif /* Check for valid float value for this type on this target machine. */ got_it: set_float_handler (NULL_PTR); #ifdef CHECK_FLOAT_VALUE CHECK_FLOAT_VALUE (TYPE_MODE (type), d, overflow); #endif TREE_REAL_CST (v) = d; TREE_OVERFLOW (v) = TREE_CONSTANT_OVERFLOW (v) = overflow; return v; } #endif /* not REAL_IS_NOT_DOUBLE, or REAL_ARITHMETIC */ /* Return a newly constructed STRING_CST node whose value is the LEN characters at STR. The TREE_TYPE is not initialized. */ tree build_string (len, str) int len; char *str; { /* Put the string in saveable_obstack since it will be placed in the RTL for an "asm" statement and will also be kept around a while if deferring constant output in varasm.c. */ register tree s = make_node (STRING_CST); TREE_STRING_LENGTH (s) = len; TREE_STRING_POINTER (s) = obstack_copy0 (saveable_obstack, str, len); return s; } /* Return a newly constructed COMPLEX_CST node whose value is specified by the real and imaginary parts REAL and IMAG. Both REAL and IMAG should be constant nodes. TYPE, if specified, will be the type of the COMPLEX_CST; otherwise a new type will be made. */ tree build_complex (type, real, imag) tree type; tree real, imag; { register tree t = make_node (COMPLEX_CST); TREE_REALPART (t) = real; TREE_IMAGPART (t) = imag; TREE_TYPE (t) = type ? type : build_complex_type (TREE_TYPE (real)); TREE_OVERFLOW (t) = TREE_OVERFLOW (real) | TREE_OVERFLOW (imag); TREE_CONSTANT_OVERFLOW (t) = TREE_CONSTANT_OVERFLOW (real) | TREE_CONSTANT_OVERFLOW (imag); return t; } /* Build a newly constructed TREE_VEC node of length LEN. */ tree make_tree_vec (len) int len; { register tree t; register int length = (len-1) * sizeof (tree) + sizeof (struct tree_vec); register struct obstack *obstack = current_obstack; #ifdef GATHER_STATISTICS tree_node_counts[(int)vec_kind]++; tree_node_sizes[(int)vec_kind] += length; #endif t = (tree) obstack_alloc (obstack, length); bzero (t, length); TREE_SET_CODE (t, TREE_VEC); TREE_VEC_LENGTH (t) = len; if (obstack == &permanent_obstack) TREE_PERMANENT (t) = 1; return t; } /* Return 1 if EXPR is the integer constant zero or a complex constant of zero. */ int integer_zerop (expr) tree expr; { STRIP_NOPS (expr); return ((TREE_CODE (expr) == INTEGER_CST && ! TREE_CONSTANT_OVERFLOW (expr) && TREE_INT_CST_LOW (expr) == 0 && TREE_INT_CST_HIGH (expr) == 0) || (TREE_CODE (expr) == COMPLEX_CST && integer_zerop (TREE_REALPART (expr)) && integer_zerop (TREE_IMAGPART (expr)))); } /* Return 1 if EXPR is the integer constant one or the corresponding complex constant. */ int integer_onep (expr) tree expr; { STRIP_NOPS (expr); return ((TREE_CODE (expr) == INTEGER_CST && ! TREE_CONSTANT_OVERFLOW (expr) && TREE_INT_CST_LOW (expr) == 1 && TREE_INT_CST_HIGH (expr) == 0) || (TREE_CODE (expr) == COMPLEX_CST && integer_onep (TREE_REALPART (expr)) && integer_zerop (TREE_IMAGPART (expr)))); } /* Return 1 if EXPR is an integer containing all 1's in as much precision as it contains. Likewise for the corresponding complex constant. */ int integer_all_onesp (expr) tree expr; { register int prec; register int uns; STRIP_NOPS (expr); if (TREE_CODE (expr) == COMPLEX_CST && integer_all_onesp (TREE_REALPART (expr)) && integer_zerop (TREE_IMAGPART (expr))) return 1; else if (TREE_CODE (expr) != INTEGER_CST || TREE_CONSTANT_OVERFLOW (expr)) return 0; uns = TREE_UNSIGNED (TREE_TYPE (expr)); if (!uns) return TREE_INT_CST_LOW (expr) == -1 && TREE_INT_CST_HIGH (expr) == -1; /* Note that using TYPE_PRECISION here is wrong. We care about the actual bits, not the (arbitrary) range of the type. */ prec = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr))); if (prec >= HOST_BITS_PER_WIDE_INT) { int high_value, shift_amount; shift_amount = prec - HOST_BITS_PER_WIDE_INT; if (shift_amount > HOST_BITS_PER_WIDE_INT) /* Can not handle precisions greater than twice the host int size. */ abort (); else if (shift_amount == HOST_BITS_PER_WIDE_INT) /* Shifting by the host word size is undefined according to the ANSI standard, so we must handle this as a special case. */ high_value = -1; else high_value = ((HOST_WIDE_INT) 1 << shift_amount) - 1; return TREE_INT_CST_LOW (expr) == -1 && TREE_INT_CST_HIGH (expr) == high_value; } else return TREE_INT_CST_LOW (expr) == ((HOST_WIDE_INT) 1 << prec) - 1; } /* Return 1 if EXPR is an integer constant that is a power of 2 (i.e., has only one bit on). */ int integer_pow2p (expr) tree expr; { int prec; HOST_WIDE_INT high, low; STRIP_NOPS (expr); if (TREE_CODE (expr) == COMPLEX_CST && integer_pow2p (TREE_REALPART (expr)) && integer_zerop (TREE_IMAGPART (expr))) return 1; if (TREE_CODE (expr) != INTEGER_CST || TREE_CONSTANT_OVERFLOW (expr)) return 0; prec = (POINTER_TYPE_P (TREE_TYPE (expr)) ? POINTER_SIZE : TYPE_PRECISION (TREE_TYPE (expr))); high = TREE_INT_CST_HIGH (expr); low = TREE_INT_CST_LOW (expr); /* First clear all bits that are beyond the type's precision in case we've been sign extended. */ if (prec == 2 * HOST_BITS_PER_WIDE_INT) ; else if (prec > HOST_BITS_PER_WIDE_INT) high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT)); else { high = 0; if (prec < HOST_BITS_PER_WIDE_INT) low &= ~((HOST_WIDE_INT) (-1) << prec); } if (high == 0 && low == 0) return 0; return ((high == 0 && (low & (low - 1)) == 0) || (low == 0 && (high & (high - 1)) == 0)); } /* Return the power of two represented by a tree node known to be a power of two. */ int tree_log2 (expr) tree expr; { int prec; HOST_WIDE_INT high, low; STRIP_NOPS (expr); if (TREE_CODE (expr) == COMPLEX_CST) return tree_log2 (TREE_REALPART (expr)); prec = (POINTER_TYPE_P (TREE_TYPE (expr)) ? POINTER_SIZE : TYPE_PRECISION (TREE_TYPE (expr))); high = TREE_INT_CST_HIGH (expr); low = TREE_INT_CST_LOW (expr); /* First clear all bits that are beyond the type's precision in case we've been sign extended. */ if (prec == 2 * HOST_BITS_PER_WIDE_INT) ; else if (prec > HOST_BITS_PER_WIDE_INT) high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT)); else { high = 0; if (prec < HOST_BITS_PER_WIDE_INT) low &= ~((HOST_WIDE_INT) (-1) << prec); } return (high != 0 ? HOST_BITS_PER_WIDE_INT + exact_log2 (high) : exact_log2 (low)); } /* Return 1 if EXPR is the real constant zero. */ int real_zerop (expr) tree expr; { STRIP_NOPS (expr); return ((TREE_CODE (expr) == REAL_CST && ! TREE_CONSTANT_OVERFLOW (expr) && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst0)) || (TREE_CODE (expr) == COMPLEX_CST && real_zerop (TREE_REALPART (expr)) && real_zerop (TREE_IMAGPART (expr)))); } /* Return 1 if EXPR is the real constant one in real or complex form. */ int real_onep (expr) tree expr; { STRIP_NOPS (expr); return ((TREE_CODE (expr) == REAL_CST && ! TREE_CONSTANT_OVERFLOW (expr) && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst1)) || (TREE_CODE (expr) == COMPLEX_CST && real_onep (TREE_REALPART (expr)) && real_zerop (TREE_IMAGPART (expr)))); } /* Return 1 if EXPR is the real constant two. */ int real_twop (expr) tree expr; { STRIP_NOPS (expr); return ((TREE_CODE (expr) == REAL_CST && ! TREE_CONSTANT_OVERFLOW (expr) && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst2)) || (TREE_CODE (expr) == COMPLEX_CST && real_twop (TREE_REALPART (expr)) && real_zerop (TREE_IMAGPART (expr)))); } /* Nonzero if EXP is a constant or a cast of a constant. */ int really_constant_p (exp) tree exp; { /* This is not quite the same as STRIP_NOPS. It does more. */ while (TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR || TREE_CODE (exp) == NON_LVALUE_EXPR) exp = TREE_OPERAND (exp, 0); return TREE_CONSTANT (exp); } /* Return first list element whose TREE_VALUE is ELEM. Return 0 if ELEM is not in LIST. */ tree value_member (elem, list) tree elem, list; { while (list) { if (elem == TREE_VALUE (list)) return list; list = TREE_CHAIN (list); } return NULL_TREE; } /* Return first list element whose TREE_PURPOSE is ELEM. Return 0 if ELEM is not in LIST. */ tree purpose_member (elem, list) tree elem, list; { while (list) { if (elem == TREE_PURPOSE (list)) return list; list = TREE_CHAIN (list); } return NULL_TREE; } /* Return first list element whose BINFO_TYPE is ELEM. Return 0 if ELEM is not in LIST. */ tree binfo_member (elem, list) tree elem, list; { while (list) { if (elem == BINFO_TYPE (list)) return list; list = TREE_CHAIN (list); } return NULL_TREE; } /* Return nonzero if ELEM is part of the chain CHAIN. */ int chain_member (elem, chain) tree elem, chain; { while (chain) { if (elem == chain) return 1; chain = TREE_CHAIN (chain); } return 0; } /* Return nonzero if ELEM is equal to TREE_VALUE (CHAIN) for any piece of chain CHAIN. */ /* ??? This function was added for machine specific attributes but is no longer used. It could be deleted if we could confirm all front ends don't use it. */ int chain_member_value (elem, chain) tree elem, chain; { while (chain) { if (elem == TREE_VALUE (chain)) return 1; chain = TREE_CHAIN (chain); } return 0; } /* Return nonzero if ELEM is equal to TREE_PURPOSE (CHAIN) for any piece of chain CHAIN. */ /* ??? This function was added for machine specific attributes but is no longer used. It could be deleted if we could confirm all front ends don't use it. */ int chain_member_purpose (elem, chain) tree elem, chain; { while (chain) { if (elem == TREE_PURPOSE (chain)) return 1; chain = TREE_CHAIN (chain); } return 0; } /* Return the length of a chain of nodes chained through TREE_CHAIN. We expect a null pointer to mark the end of the chain. This is the Lisp primitive `length'. */ int list_length (t) tree t; { register tree tail; register int len = 0; for (tail = t; tail; tail = TREE_CHAIN (tail)) len++; return len; } /* Concatenate two chains of nodes (chained through TREE_CHAIN) by modifying the last node in chain 1 to point to chain 2. This is the Lisp primitive `nconc'. */ tree chainon (op1, op2) tree op1, op2; { if (op1) { register tree t1; register tree t2; for (t1 = op1; TREE_CHAIN (t1); t1 = TREE_CHAIN (t1)) ; TREE_CHAIN (t1) = op2; for (t2 = op2; t2; t2 = TREE_CHAIN (t2)) if (t2 == t1) abort (); /* Circularity created. */ return op1; } else return op2; } /* Return the last node in a chain of nodes (chained through TREE_CHAIN). */ tree tree_last (chain) register tree chain; { register tree next; if (chain) while ((next = TREE_CHAIN (chain))) chain = next; return chain; } /* Reverse the order of elements in the chain T, and return the new head of the chain (old last element). */ tree nreverse (t) tree t; { register tree prev = 0, decl, next; for (decl = t; decl; decl = next) { next = TREE_CHAIN (decl); TREE_CHAIN (decl) = prev; prev = decl; } return prev; } /* Given a chain CHAIN of tree nodes, construct and return a list of those nodes. */ tree listify (chain) tree chain; { tree result = NULL_TREE; tree in_tail = chain; tree out_tail = NULL_TREE; while (in_tail) { tree next = tree_cons (NULL_TREE, in_tail, NULL_TREE); if (out_tail) TREE_CHAIN (out_tail) = next; else result = next; out_tail = next; in_tail = TREE_CHAIN (in_tail); } return result; } /* Return a newly created TREE_LIST node whose purpose and value fields are PARM and VALUE. */ tree build_tree_list (parm, value) tree parm, value; { register tree t = make_node (TREE_LIST); TREE_PURPOSE (t) = parm; TREE_VALUE (t) = value; return t; } /* Similar, but build on the temp_decl_obstack. */ tree build_decl_list (parm, value) tree parm, value; { register tree node; register struct obstack *ambient_obstack = current_obstack; current_obstack = &temp_decl_obstack; node = build_tree_list (parm, value); current_obstack = ambient_obstack; return node; } /* Similar, but build on the expression_obstack. */ tree build_expr_list (parm, value) tree parm, value; { register tree node; register struct obstack *ambient_obstack = current_obstack; current_obstack = expression_obstack; node = build_tree_list (parm, value); current_obstack = ambient_obstack; return node; } /* Return a newly created TREE_LIST node whose purpose and value fields are PARM and VALUE and whose TREE_CHAIN is CHAIN. */ tree tree_cons (purpose, value, chain) tree purpose, value, chain; { #if 0 register tree node = make_node (TREE_LIST); #else register int i; register tree node = (tree) obstack_alloc (current_obstack, sizeof (struct tree_list)); #ifdef GATHER_STATISTICS tree_node_counts[(int)x_kind]++; tree_node_sizes[(int)x_kind] += sizeof (struct tree_list); #endif for (i = (sizeof (struct tree_common) / sizeof (int)) - 1; i >= 0; i--) ((int *) node)[i] = 0; TREE_SET_CODE (node, TREE_LIST); if (current_obstack == &permanent_obstack) TREE_PERMANENT (node) = 1; #endif TREE_CHAIN (node) = chain; TREE_PURPOSE (node) = purpose; TREE_VALUE (node) = value; return node; } /* Similar, but build on the temp_decl_obstack. */ tree decl_tree_cons (purpose, value, chain) tree purpose, value, chain; { register tree node; register struct obstack *ambient_obstack = current_obstack; current_obstack = &temp_decl_obstack; node = tree_cons (purpose, value, chain); current_obstack = ambient_obstack; return node; } /* Similar, but build on the expression_obstack. */ tree expr_tree_cons (purpose, value, chain) tree purpose, value, chain; { register tree node; register struct obstack *ambient_obstack = current_obstack; current_obstack = expression_obstack; node = tree_cons (purpose, value, chain); current_obstack = ambient_obstack; return node; } /* Same as `tree_cons' but make a permanent object. */ tree perm_tree_cons (purpose, value, chain) tree purpose, value, chain; { register tree node; register struct obstack *ambient_obstack = current_obstack; current_obstack = &permanent_obstack; node = tree_cons (purpose, value, chain); current_obstack = ambient_obstack; return node; } /* Same as `tree_cons', but make this node temporary, regardless. */ tree temp_tree_cons (purpose, value, chain) tree purpose, value, chain; { register tree node; register struct obstack *ambient_obstack = current_obstack; current_obstack = &temporary_obstack; node = tree_cons (purpose, value, chain); current_obstack = ambient_obstack; return node; } /* Same as `tree_cons', but save this node if the function's RTL is saved. */ tree saveable_tree_cons (purpose, value, chain) tree purpose, value, chain; { register tree node; register struct obstack *ambient_obstack = current_obstack; current_obstack = saveable_obstack; node = tree_cons (purpose, value, chain); current_obstack = ambient_obstack; return node; } /* Return the size nominally occupied by an object of type TYPE when it resides in memory. The value is measured in units of bytes, and its data type is that normally used for type sizes (which is the first type created by make_signed_type or make_unsigned_type). */ tree size_in_bytes (type) tree type; { tree t; if (type == error_mark_node) return integer_zero_node; type = TYPE_MAIN_VARIANT (type); t = TYPE_SIZE_UNIT (type); if (t == 0) { incomplete_type_error (NULL_TREE, type); return integer_zero_node; } if (TREE_CODE (t) == INTEGER_CST) force_fit_type (t, 0); return t; } /* Return the size of TYPE (in bytes) as a wide integer or return -1 if the size can vary or is larger than an integer. */ HOST_WIDE_INT int_size_in_bytes (type) tree type; { tree t; if (type == error_mark_node) return 0; type = TYPE_MAIN_VARIANT (type); t = TYPE_SIZE_UNIT (type); if (t == 0 || TREE_CODE (t) != INTEGER_CST || TREE_INT_CST_HIGH (t) != 0) return -1; return TREE_INT_CST_LOW (t); } /* Return, as a tree node, the number of elements for TYPE (which is an ARRAY_TYPE) minus one. This counts only elements of the top array. Don't let any SAVE_EXPRs escape; if we are called as part of a cleanup action, they would get unsaved. */ tree array_type_nelts (type) tree type; { tree index_type, min, max; /* If they did it with unspecified bounds, then we should have already given an error about it before we got here. */ if (! TYPE_DOMAIN (type)) return error_mark_node; index_type = TYPE_DOMAIN (type); min = TYPE_MIN_VALUE (index_type); max = TYPE_MAX_VALUE (index_type); if (! TREE_CONSTANT (min)) { STRIP_NOPS (min); if (TREE_CODE (min) == SAVE_EXPR) min = build (RTL_EXPR, TREE_TYPE (TYPE_MIN_VALUE (index_type)), 0, SAVE_EXPR_RTL (min)); else min = TYPE_MIN_VALUE (index_type); } if (! TREE_CONSTANT (max)) { STRIP_NOPS (max); if (TREE_CODE (max) == SAVE_EXPR) max = build (RTL_EXPR, TREE_TYPE (TYPE_MAX_VALUE (index_type)), 0, SAVE_EXPR_RTL (max)); else max = TYPE_MAX_VALUE (index_type); } return (integer_zerop (min) ? max : fold (build (MINUS_EXPR, TREE_TYPE (max), max, min))); } /* Return nonzero if arg is static -- a reference to an object in static storage. This is not the same as the C meaning of `static'. */ int staticp (arg) tree arg; { switch (TREE_CODE (arg)) { case FUNCTION_DECL: /* Nested functions aren't static, since taking their address involves a trampoline. */ return (decl_function_context (arg) == 0 || DECL_NO_STATIC_CHAIN (arg)) && ! DECL_NON_ADDR_CONST_P (arg); case VAR_DECL: return (TREE_STATIC (arg) || DECL_EXTERNAL (arg)) && ! DECL_NON_ADDR_CONST_P (arg); case CONSTRUCTOR: return TREE_STATIC (arg); case STRING_CST: return 1; /* If we are referencing a bitfield, we can't evaluate an ADDR_EXPR at compile time and so it isn't a constant. */ case COMPONENT_REF: return (! DECL_BIT_FIELD (TREE_OPERAND (arg, 1)) && staticp (TREE_OPERAND (arg, 0))); case BIT_FIELD_REF: return 0; #if 0 /* This case is technically correct, but results in setting TREE_CONSTANT on ADDR_EXPRs that cannot be evaluated at compile time. */ case INDIRECT_REF: return TREE_CONSTANT (TREE_OPERAND (arg, 0)); #endif case ARRAY_REF: if (TREE_CODE (TYPE_SIZE (TREE_TYPE (arg))) == INTEGER_CST && TREE_CODE (TREE_OPERAND (arg, 1)) == INTEGER_CST) return staticp (TREE_OPERAND (arg, 0)); default: return 0; } } /* Wrap a SAVE_EXPR around EXPR, if appropriate. Do this to any expression which may be used in more than one place, but must be evaluated only once. Normally, expand_expr would reevaluate the expression each time. Calling save_expr produces something that is evaluated and recorded the first time expand_expr is called on it. Subsequent calls to expand_expr just reuse the recorded value. The call to expand_expr that generates code that actually computes the value is the first call *at compile time*. Subsequent calls *at compile time* generate code to use the saved value. This produces correct result provided that *at run time* control always flows through the insns made by the first expand_expr before reaching the other places where the save_expr was evaluated. You, the caller of save_expr, must make sure this is so. Constants, and certain read-only nodes, are returned with no SAVE_EXPR because that is safe. Expressions containing placeholders are not touched; see tree.def for an explanation of what these are used for. */ tree save_expr (expr) tree expr; { register tree t = fold (expr); /* We don't care about whether this can be used as an lvalue in this context. */ while (TREE_CODE (t) == NON_LVALUE_EXPR) t = TREE_OPERAND (t, 0); /* If the tree evaluates to a constant, then we don't want to hide that fact (i.e. this allows further folding, and direct checks for constants). However, a read-only object that has side effects cannot be bypassed. Since it is no problem to reevaluate literals, we just return the literal node. */ if (TREE_CONSTANT (t) || (TREE_READONLY (t) && ! TREE_SIDE_EFFECTS (t)) || TREE_CODE (t) == SAVE_EXPR || TREE_CODE (t) == ERROR_MARK) return t; /* If T contains a PLACEHOLDER_EXPR, we must evaluate it each time, since it means that the size or offset of some field of an object depends on the value within another field. Note that it must not be the case that T contains both a PLACEHOLDER_EXPR and some variable since it would then need to be both evaluated once and evaluated more than once. Front-ends must assure this case cannot happen by surrounding any such subexpressions in their own SAVE_EXPR and forcing evaluation at the proper time. */ if (contains_placeholder_p (t)) return t; t = build (SAVE_EXPR, TREE_TYPE (expr), t, current_function_decl, NULL_TREE); /* This expression might be placed ahead of a jump to ensure that the value was computed on both sides of the jump. So make sure it isn't eliminated as dead. */ TREE_SIDE_EFFECTS (t) = 1; return t; } /* Arrange for an expression to be expanded multiple independent times. This is useful for cleanup actions, as the backend can expand them multiple times in different places. */ tree unsave_expr (expr) tree expr; { tree t; /* If this is already protected, no sense in protecting it again. */ if (TREE_CODE (expr) == UNSAVE_EXPR) return expr; t = build1 (UNSAVE_EXPR, TREE_TYPE (expr), expr); TREE_SIDE_EFFECTS (t) = TREE_SIDE_EFFECTS (expr); return t; } /* Returns the index of the first non-tree operand for CODE, or the number of operands if all are trees. */ int first_rtl_op (code) enum tree_code code; { switch (code) { case SAVE_EXPR: return 2; case RTL_EXPR: return 0; case CALL_EXPR: return 2; case WITH_CLEANUP_EXPR: /* Should be defined to be 2. */ return 1; case METHOD_CALL_EXPR: return 3; default: return tree_code_length [(int) code]; } } /* Modify a tree in place so that all the evaluate only once things are cleared out. Return the EXPR given. */ tree unsave_expr_now (expr) tree expr; { enum tree_code code; register int i; int first_rtl; if (expr == NULL_TREE) return expr; code = TREE_CODE (expr); first_rtl = first_rtl_op (code); switch (code) { case SAVE_EXPR: SAVE_EXPR_RTL (expr) = 0; break; case TARGET_EXPR: TREE_OPERAND (expr, 1) = TREE_OPERAND (expr, 3); TREE_OPERAND (expr, 3) = NULL_TREE; break; case RTL_EXPR: /* I don't yet know how to emit a sequence multiple times. */ if (RTL_EXPR_SEQUENCE (expr) != 0) abort (); break; case CALL_EXPR: CALL_EXPR_RTL (expr) = 0; if (TREE_OPERAND (expr, 1) && TREE_CODE (TREE_OPERAND (expr, 1)) == TREE_LIST) { tree exp = TREE_OPERAND (expr, 1); while (exp) { unsave_expr_now (TREE_VALUE (exp)); exp = TREE_CHAIN (exp); } } break; default: break; } switch (TREE_CODE_CLASS (code)) { case 'c': /* a constant */ case 't': /* a type node */ case 'x': /* something random, like an identifier or an ERROR_MARK. */ case 'd': /* A decl node */ case 'b': /* A block node */ return expr; case 'e': /* an expression */ case 'r': /* a reference */ case 's': /* an expression with side effects */ case '<': /* a comparison expression */ case '2': /* a binary arithmetic expression */ case '1': /* a unary arithmetic expression */ for (i = first_rtl - 1; i >= 0; i--) unsave_expr_now (TREE_OPERAND (expr, i)); return expr; default: abort (); } } /* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size or offset that depends on a field within a record. */ int contains_placeholder_p (exp) tree exp; { register enum tree_code code = TREE_CODE (exp); int result; /* If we have a WITH_RECORD_EXPR, it "cancels" any PLACEHOLDER_EXPR in it since it is supplying a value for it. */ if (code == WITH_RECORD_EXPR) return 0; else if (code == PLACEHOLDER_EXPR) return 1; switch (TREE_CODE_CLASS (code)) { case 'r': /* Don't look at any PLACEHOLDER_EXPRs that might be in index or bit position computations since they will be converted into a WITH_RECORD_EXPR involving the reference, which will assume here will be valid. */ return contains_placeholder_p (TREE_OPERAND (exp, 0)); case 'x': if (code == TREE_LIST) return (contains_placeholder_p (TREE_VALUE (exp)) || (TREE_CHAIN (exp) != 0 && contains_placeholder_p (TREE_CHAIN (exp)))); break; case '1': case '2': case '<': case 'e': switch (code) { case COMPOUND_EXPR: /* Ignoring the first operand isn't quite right, but works best. */ return contains_placeholder_p (TREE_OPERAND (exp, 1)); case RTL_EXPR: case CONSTRUCTOR: return 0; case COND_EXPR: return (contains_placeholder_p (TREE_OPERAND (exp, 0)) || contains_placeholder_p (TREE_OPERAND (exp, 1)) || contains_placeholder_p (TREE_OPERAND (exp, 2))); case SAVE_EXPR: /* If we already know this doesn't have a placeholder, don't check again. */ if (SAVE_EXPR_NOPLACEHOLDER (exp) || SAVE_EXPR_RTL (exp) != 0) return 0; SAVE_EXPR_NOPLACEHOLDER (exp) = 1; result = contains_placeholder_p (TREE_OPERAND (exp, 0)); if (result) SAVE_EXPR_NOPLACEHOLDER (exp) = 0; return result; case CALL_EXPR: return (TREE_OPERAND (exp, 1) != 0 && contains_placeholder_p (TREE_OPERAND (exp, 1))); default: break; } switch (tree_code_length[(int) code]) { case 1: return contains_placeholder_p (TREE_OPERAND (exp, 0)); case 2: return (contains_placeholder_p (TREE_OPERAND (exp, 0)) || contains_placeholder_p (TREE_OPERAND (exp, 1))); default: return 0; } default: return 0; } return 0; } /* Return 1 if EXP contains any expressions that produce cleanups for an outer scope to deal with. Used by fold. */ int has_cleanups (exp) tree exp; { int i, nops, cmp; if (! TREE_SIDE_EFFECTS (exp)) return 0; switch (TREE_CODE (exp)) { case TARGET_EXPR: case WITH_CLEANUP_EXPR: return 1; case CLEANUP_POINT_EXPR: return 0; case CALL_EXPR: for (exp = TREE_OPERAND (exp, 1); exp; exp = TREE_CHAIN (exp)) { cmp = has_cleanups (TREE_VALUE (exp)); if (cmp) return cmp; } return 0; default: break; } /* This general rule works for most tree codes. All exceptions should be handled above. If this is a language-specific tree code, we can't trust what might be in the operand, so say we don't know the situation. */ if ((int) TREE_CODE (exp) >= (int) LAST_AND_UNUSED_TREE_CODE) return -1; nops = first_rtl_op (TREE_CODE (exp)); for (i = 0; i < nops; i++) if (TREE_OPERAND (exp, i) != 0) { int type = TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, i))); if (type == 'e' || type == '<' || type == '1' || type == '2' || type == 'r' || type == 's') { cmp = has_cleanups (TREE_OPERAND (exp, i)); if (cmp) return cmp; } } return 0; } /* Given a tree EXP, a FIELD_DECL F, and a replacement value R, return a tree with all occurrences of references to F in a PLACEHOLDER_EXPR replaced by R. Note that we assume here that EXP contains only arithmetic expressions or a CALL_EXPR with a PLACEHOLDER_EXPR occurring only in its arglist. */ tree substitute_in_expr (exp, f, r) tree exp; tree f; tree r; { enum tree_code code = TREE_CODE (exp); tree op0, op1, op2; tree new; tree inner; switch (TREE_CODE_CLASS (code)) { case 'c': case 'd': return exp; case 'x': if (code == PLACEHOLDER_EXPR) return exp; else if (code == TREE_LIST) { op0 = (TREE_CHAIN (exp) == 0 ? 0 : substitute_in_expr (TREE_CHAIN (exp), f, r)); op1 = substitute_in_expr (TREE_VALUE (exp), f, r); if (op0 == TREE_CHAIN (exp) && op1 == TREE_VALUE (exp)) return exp; return tree_cons (TREE_PURPOSE (exp), op1, op0); } abort (); case '1': case '2': case '<': case 'e': switch (tree_code_length[(int) code]) { case 1: op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r); if (op0 == TREE_OPERAND (exp, 0)) return exp; new = fold (build1 (code, TREE_TYPE (exp), op0)); break; case 2: /* An RTL_EXPR cannot contain a PLACEHOLDER_EXPR; a CONSTRUCTOR could, but we don't support it. */ if (code == RTL_EXPR) return exp; else if (code == CONSTRUCTOR) abort (); op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r); op1 = substitute_in_expr (TREE_OPERAND (exp, 1), f, r); if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)) return exp; new = fold (build (code, TREE_TYPE (exp), op0, op1)); break; case 3: /* It cannot be that anything inside a SAVE_EXPR contains a PLACEHOLDER_EXPR. */ if (code == SAVE_EXPR) return exp; else if (code == CALL_EXPR) { op1 = substitute_in_expr (TREE_OPERAND (exp, 1), f, r); if (op1 == TREE_OPERAND (exp, 1)) return exp; return build (code, TREE_TYPE (exp), TREE_OPERAND (exp, 0), op1, NULL_TREE); } else if (code != COND_EXPR) abort (); op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r); op1 = substitute_in_expr (TREE_OPERAND (exp, 1), f, r); op2 = substitute_in_expr (TREE_OPERAND (exp, 2), f, r); if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1) && op2 == TREE_OPERAND (exp, 2)) return exp; new = fold (build (code, TREE_TYPE (exp), op0, op1, op2)); break; default: abort (); } break; case 'r': switch (code) { case COMPONENT_REF: /* If this expression is getting a value from a PLACEHOLDER_EXPR and it is the right field, replace it with R. */ for (inner = TREE_OPERAND (exp, 0); TREE_CODE_CLASS (TREE_CODE (inner)) == 'r'; inner = TREE_OPERAND (inner, 0)) ; if (TREE_CODE (inner) == PLACEHOLDER_EXPR && TREE_OPERAND (exp, 1) == f) return r; /* If this expression hasn't been completed let, leave it alone. */ if (TREE_CODE (inner) == PLACEHOLDER_EXPR && TREE_TYPE (inner) == 0) return exp; op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r); if (op0 == TREE_OPERAND (exp, 0)) return exp; new = fold (build (code, TREE_TYPE (exp), op0, TREE_OPERAND (exp, 1))); break; case BIT_FIELD_REF: op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r); op1 = substitute_in_expr (TREE_OPERAND (exp, 1), f, r); op2 = substitute_in_expr (TREE_OPERAND (exp, 2), f, r); if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1) && op2 == TREE_OPERAND (exp, 2)) return exp; new = fold (build (code, TREE_TYPE (exp), op0, op1, op2)); break; case INDIRECT_REF: case BUFFER_REF: op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r); if (op0 == TREE_OPERAND (exp, 0)) return exp; new = fold (build1 (code, TREE_TYPE (exp), op0)); break; default: abort (); } break; default: abort (); } TREE_READONLY (new) = TREE_READONLY (exp); return new; } /* Stabilize a reference so that we can use it any number of times without causing its operands to be evaluated more than once. Returns the stabilized reference. This works by means of save_expr, so see the caveats in the comments about save_expr. Also allows conversion expressions whose operands are references. Any other kind of expression is returned unchanged. */ tree stabilize_reference (ref) tree ref; { register tree result; register enum tree_code code = TREE_CODE (ref); switch (code) { case VAR_DECL: case PARM_DECL: case RESULT_DECL: /* No action is needed in this case. */ return ref; case NOP_EXPR: case CONVERT_EXPR: case FLOAT_EXPR: case FIX_TRUNC_EXPR: case FIX_FLOOR_EXPR: case FIX_ROUND_EXPR: case FIX_CEIL_EXPR: result = build_nt (code, stabilize_reference (TREE_OPERAND (ref, 0))); break; case INDIRECT_REF: result = build_nt (INDIRECT_REF, stabilize_reference_1 (TREE_OPERAND (ref, 0))); break; case COMPONENT_REF: result = build_nt (COMPONENT_REF, stabilize_reference (TREE_OPERAND (ref, 0)), TREE_OPERAND (ref, 1)); break; case BIT_FIELD_REF: result = build_nt (BIT_FIELD_REF, stabilize_reference (TREE_OPERAND (ref, 0)), stabilize_reference_1 (TREE_OPERAND (ref, 1)), stabilize_reference_1 (TREE_OPERAND (ref, 2))); break; case ARRAY_REF: result = build_nt (ARRAY_REF, stabilize_reference (TREE_OPERAND (ref, 0)), stabilize_reference_1 (TREE_OPERAND (ref, 1))); break; case COMPOUND_EXPR: /* We cannot wrap the first expression in a SAVE_EXPR, as then it wouldn't be ignored. This matters when dealing with volatiles. */ return stabilize_reference_1 (ref); case RTL_EXPR: result = build1 (INDIRECT_REF, TREE_TYPE (ref), save_expr (build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (ref)), ref))); break; /* If arg isn't a kind of lvalue we recognize, make no change. Caller should recognize the error for an invalid lvalue. */ default: return ref; case ERROR_MARK: return error_mark_node; } TREE_TYPE (result) = TREE_TYPE (ref); TREE_READONLY (result) = TREE_READONLY (ref); TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (ref); TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (ref); TREE_RAISES (result) = TREE_RAISES (ref); return result; } /* Subroutine of stabilize_reference; this is called for subtrees of references. Any expression with side-effects must be put in a SAVE_EXPR to ensure that it is only evaluated once. We don't put SAVE_EXPR nodes around everything, because assigning very simple expressions to temporaries causes us to miss good opportunities for optimizations. Among other things, the opportunity to fold in the addition of a constant into an addressing mode often gets lost, e.g. "y[i+1] += x;". In general, we take the approach that we should not make an assignment unless we are forced into it - i.e., that any non-side effect operator should be allowed, and that cse should take care of coalescing multiple utterances of the same expression should that prove fruitful. */ tree stabilize_reference_1 (e) tree e; { register tree result; register enum tree_code code = TREE_CODE (e); /* We cannot ignore const expressions because it might be a reference to a const array but whose index contains side-effects. But we can ignore things that are actual constant or that already have been handled by this function. */ if (TREE_CONSTANT (e) || code == SAVE_EXPR) return e; switch (TREE_CODE_CLASS (code)) { case 'x': case 't': case 'd': case 'b': case '<': case 's': case 'e': case 'r': /* If the expression has side-effects, then encase it in a SAVE_EXPR so that it will only be evaluated once. */ /* The reference (r) and comparison (<) classes could be handled as below, but it is generally faster to only evaluate them once. */ if (TREE_SIDE_EFFECTS (e)) return save_expr (e); return e; case 'c': /* Constants need no processing. In fact, we should never reach here. */ return e; case '2': /* Division is slow and tends to be compiled with jumps, especially the division by powers of 2 that is often found inside of an array reference. So do it just once. */ if (code == TRUNC_DIV_EXPR || code == TRUNC_MOD_EXPR || code == FLOOR_DIV_EXPR || code == FLOOR_MOD_EXPR || code == CEIL_DIV_EXPR || code == CEIL_MOD_EXPR || code == ROUND_DIV_EXPR || code == ROUND_MOD_EXPR) return save_expr (e); /* Recursively stabilize each operand. */ result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)), stabilize_reference_1 (TREE_OPERAND (e, 1))); break; case '1': /* Recursively stabilize each operand. */ result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0))); break; default: abort (); } TREE_TYPE (result) = TREE_TYPE (e); TREE_READONLY (result) = TREE_READONLY (e); TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (e); TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (e); TREE_RAISES (result) = TREE_RAISES (e); return result; } /* Low-level constructors for expressions. */ /* Build an expression of code CODE, data type TYPE, and operands as specified by the arguments ARG1 and following arguments. Expressions and reference nodes can be created this way. Constants, decls, types and misc nodes cannot be. */ tree build VPROTO((enum tree_code code, tree tt, ...)) { #ifndef ANSI_PROTOTYPES enum tree_code code; tree tt; #endif va_list p; register tree t; register int length; register int i; VA_START (p, tt); #ifndef ANSI_PROTOTYPES code = va_arg (p, enum tree_code); tt = va_arg (p, tree); #endif t = make_node (code); length = tree_code_length[(int) code]; TREE_TYPE (t) = tt; if (length == 2) { /* This is equivalent to the loop below, but faster. */ register tree arg0 = va_arg (p, tree); register tree arg1 = va_arg (p, tree); TREE_OPERAND (t, 0) = arg0; TREE_OPERAND (t, 1) = arg1; if ((arg0 && TREE_SIDE_EFFECTS (arg0)) || (arg1 && TREE_SIDE_EFFECTS (arg1))) TREE_SIDE_EFFECTS (t) = 1; TREE_RAISES (t) = (arg0 && TREE_RAISES (arg0)) || (arg1 && TREE_RAISES (arg1)); } else if (length == 1) { register tree arg0 = va_arg (p, tree); /* Call build1 for this! */ if (TREE_CODE_CLASS (code) != 's') abort (); TREE_OPERAND (t, 0) = arg0; if (arg0 && TREE_SIDE_EFFECTS (arg0)) TREE_SIDE_EFFECTS (t) = 1; TREE_RAISES (t) = (arg0 && TREE_RAISES (arg0)); } else { for (i = 0; i < length; i++) { register tree operand = va_arg (p, tree); TREE_OPERAND (t, i) = operand; if (operand) { if (TREE_SIDE_EFFECTS (operand)) TREE_SIDE_EFFECTS (t) = 1; if (TREE_RAISES (operand)) TREE_RAISES (t) = 1; } } } va_end (p); return t; } /* Same as above, but only builds for unary operators. Saves lions share of calls to `build'; cuts down use of varargs, which is expensive for RISC machines. */ tree build1 (code, type, node) enum tree_code code; tree type; tree node; { register struct obstack *obstack = expression_obstack; register int length; #ifdef GATHER_STATISTICS register tree_node_kind kind; #endif register tree t; #ifdef GATHER_STATISTICS if (TREE_CODE_CLASS (code) == 'r') kind = r_kind; else kind = e_kind; #endif length = sizeof (struct tree_exp); t = (tree) obstack_alloc (obstack, length); bzero (t, length); #ifdef GATHER_STATISTICS tree_node_counts[(int)kind]++; tree_node_sizes[(int)kind] += length; #endif TREE_TYPE (t) = type; TREE_SET_CODE (t, code); if (obstack == &permanent_obstack) TREE_PERMANENT (t) = 1; TREE_OPERAND (t, 0) = node; if (node) { if (TREE_SIDE_EFFECTS (node)) TREE_SIDE_EFFECTS (t) = 1; if (TREE_RAISES (node)) TREE_RAISES (t) = 1; } return t; } /* Similar except don't specify the TREE_TYPE and leave the TREE_SIDE_EFFECTS as 0. It is permissible for arguments to be null, or even garbage if their values do not matter. */ tree build_nt VPROTO((enum tree_code code, ...)) { #ifndef ANSI_PROTOTYPES enum tree_code code; #endif va_list p; register tree t; register int length; register int i; VA_START (p, code); #ifndef ANSI_PROTOTYPES code = va_arg (p, enum tree_code); #endif t = make_node (code); length = tree_code_length[(int) code]; for (i = 0; i < length; i++) TREE_OPERAND (t, i) = va_arg (p, tree); va_end (p); return t; } /* Similar to `build_nt', except we build on the temp_decl_obstack, regardless. */ tree build_parse_node VPROTO((enum tree_code code, ...)) { #ifndef ANSI_PROTOTYPES enum tree_code code; #endif register struct obstack *ambient_obstack = expression_obstack; va_list p; register tree t; register int length; register int i; VA_START (p, code); #ifndef ANSI_PROTOTYPES code = va_arg (p, enum tree_code); #endif expression_obstack = &temp_decl_obstack; t = make_node (code); length = tree_code_length[(int) code]; for (i = 0; i < length; i++) TREE_OPERAND (t, i) = va_arg (p, tree); va_end (p); expression_obstack = ambient_obstack; return t; } #if 0 /* Commented out because this wants to be done very differently. See cp-lex.c. */ tree build_op_identifier (op1, op2) tree op1, op2; { register tree t = make_node (OP_IDENTIFIER); TREE_PURPOSE (t) = op1; TREE_VALUE (t) = op2; return t; } #endif /* Create a DECL_... node of code CODE, name NAME and data type TYPE. We do NOT enter this node in any sort of symbol table. layout_decl is used to set up the decl's storage layout. Other slots are initialized to 0 or null pointers. */ tree build_decl (code, name, type) enum tree_code code; tree name, type; { register tree t; t = make_node (code); /* if (type == error_mark_node) type = integer_type_node; */ /* That is not done, deliberately, so that having error_mark_node as the type can suppress useless errors in the use of this variable. */ DECL_NAME (t) = name; DECL_ASSEMBLER_NAME (t) = name; TREE_TYPE (t) = type; if (code == VAR_DECL || code == PARM_DECL || code == RESULT_DECL) layout_decl (t, 0); else if (code == FUNCTION_DECL) DECL_MODE (t) = FUNCTION_MODE; return t; } /* BLOCK nodes are used to represent the structure of binding contours and declarations, once those contours have been exited and their contents compiled. This information is used for outputting debugging info. */ tree build_block (vars, tags, subblocks, supercontext, chain) tree vars, tags, subblocks, supercontext, chain; { register tree block = make_node (BLOCK); BLOCK_VARS (block) = vars; BLOCK_TYPE_TAGS (block) = tags; BLOCK_SUBBLOCKS (block) = subblocks; BLOCK_SUPERCONTEXT (block) = supercontext; BLOCK_CHAIN (block) = chain; return block; } /* EXPR_WITH_FILE_LOCATION are used to keep track of the exact location where an expression or an identifier were encountered. It is necessary for languages where the frontend parser will handle recursively more than one file (Java is one of them). */ tree build_expr_wfl (node, file, line, col) tree node; char *file; int line, col; { static char *last_file = 0; static tree last_filenode = NULL_TREE; register tree wfl = make_node (EXPR_WITH_FILE_LOCATION); EXPR_WFL_NODE (wfl) = node; EXPR_WFL_SET_LINECOL (wfl, line, col); if (file != last_file) { last_file = file; last_filenode = file ? get_identifier (file) : NULL_TREE; } EXPR_WFL_FILENAME_NODE (wfl) = last_filenode; if (node) { TREE_SIDE_EFFECTS (wfl) = TREE_SIDE_EFFECTS (node); TREE_TYPE (wfl) = TREE_TYPE (node); } return wfl; } /* Return a declaration like DDECL except that its DECL_MACHINE_ATTRIBUTE is ATTRIBUTE. */ tree build_decl_attribute_variant (ddecl, attribute) tree ddecl, attribute; { DECL_MACHINE_ATTRIBUTES (ddecl) = attribute; return ddecl; } /* Return a type like TTYPE except that its TYPE_ATTRIBUTE is ATTRIBUTE. Record such modified types already made so we don't make duplicates. */ tree build_type_attribute_variant (ttype, attribute) tree ttype, attribute; { if ( ! attribute_list_equal (TYPE_ATTRIBUTES (ttype), attribute)) { register int hashcode; register struct obstack *ambient_obstack = current_obstack; tree ntype; if (ambient_obstack != &permanent_obstack) current_obstack = TYPE_OBSTACK (ttype); ntype = copy_node (ttype); current_obstack = ambient_obstack; TYPE_POINTER_TO (ntype) = 0; TYPE_REFERENCE_TO (ntype) = 0; TYPE_ATTRIBUTES (ntype) = attribute; /* Create a new main variant of TYPE. */ TYPE_MAIN_VARIANT (ntype) = ntype; TYPE_NEXT_VARIANT (ntype) = 0; set_type_quals (ntype, TYPE_UNQUALIFIED); hashcode = TYPE_HASH (TREE_CODE (ntype)) + TYPE_HASH (TREE_TYPE (ntype)) + attribute_hash_list (attribute); switch (TREE_CODE (ntype)) { case FUNCTION_TYPE: hashcode += TYPE_HASH (TYPE_ARG_TYPES (ntype)); break; case ARRAY_TYPE: hashcode += TYPE_HASH (TYPE_DOMAIN (ntype)); break; case INTEGER_TYPE: hashcode += TYPE_HASH (TYPE_MAX_VALUE (ntype)); break; case REAL_TYPE: hashcode += TYPE_HASH (TYPE_PRECISION (ntype)); break; default: break; } ntype = type_hash_canon (hashcode, ntype); ttype = build_qualified_type (ntype, TYPE_QUALS (ttype)); } return ttype; } /* Return a 1 if ATTR_NAME and ATTR_ARGS is valid for either declaration DECL or type TYPE and 0 otherwise. Validity is determined the configuration macros VALID_MACHINE_DECL_ATTRIBUTE and VALID_MACHINE_TYPE_ATTRIBUTE. */ int valid_machine_attribute (attr_name, attr_args, decl, type) tree attr_name; tree attr_args ATTRIBUTE_UNUSED; tree decl ATTRIBUTE_UNUSED; tree type ATTRIBUTE_UNUSED; { int valid = 0; #ifdef VALID_MACHINE_DECL_ATTRIBUTE tree decl_attr_list = decl != 0 ? DECL_MACHINE_ATTRIBUTES (decl) : 0; #endif #ifdef VALID_MACHINE_TYPE_ATTRIBUTE tree type_attr_list = TYPE_ATTRIBUTES (type); #endif if (TREE_CODE (attr_name) != IDENTIFIER_NODE) abort (); #ifdef VALID_MACHINE_DECL_ATTRIBUTE if (decl != 0 && VALID_MACHINE_DECL_ATTRIBUTE (decl, decl_attr_list, attr_name, attr_args)) { tree attr = lookup_attribute (IDENTIFIER_POINTER (attr_name), decl_attr_list); if (attr != NULL_TREE) { /* Override existing arguments. Declarations are unique so we can modify this in place. */ TREE_VALUE (attr) = attr_args; } else { decl_attr_list = tree_cons (attr_name, attr_args, decl_attr_list); decl = build_decl_attribute_variant (decl, decl_attr_list); } valid = 1; } #endif #ifdef VALID_MACHINE_TYPE_ATTRIBUTE if (valid) /* Don't apply the attribute to both the decl and the type. */; else if (VALID_MACHINE_TYPE_ATTRIBUTE (type, type_attr_list, attr_name, attr_args)) { tree attr = lookup_attribute (IDENTIFIER_POINTER (attr_name), type_attr_list); if (attr != NULL_TREE) { /* Override existing arguments. ??? This currently works since attribute arguments are not included in `attribute_hash_list'. Something more complicated may be needed in the future. */ TREE_VALUE (attr) = attr_args; } else { /* If this is part of a declaration, create a type variant, otherwise, this is part of a type definition, so add it to the base type. */ type_attr_list = tree_cons (attr_name, attr_args, type_attr_list); if (decl != 0) type = build_type_attribute_variant (type, type_attr_list); else TYPE_ATTRIBUTES (type) = type_attr_list; } if (decl != 0) TREE_TYPE (decl) = type; valid = 1; } /* Handle putting a type attribute on pointer-to-function-type by putting the attribute on the function type. */ else if (POINTER_TYPE_P (type) && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE && VALID_MACHINE_TYPE_ATTRIBUTE (TREE_TYPE (type), type_attr_list, attr_name, attr_args)) { tree inner_type = TREE_TYPE (type); tree inner_attr_list = TYPE_ATTRIBUTES (inner_type); tree attr = lookup_attribute (IDENTIFIER_POINTER (attr_name), type_attr_list); if (attr != NULL_TREE) TREE_VALUE (attr) = attr_args; else { inner_attr_list = tree_cons (attr_name, attr_args, inner_attr_list); inner_type = build_type_attribute_variant (inner_type, inner_attr_list); } if (decl != 0) TREE_TYPE (decl) = build_pointer_type (inner_type); valid = 1; } #endif return valid; } /* Return non-zero if IDENT is a valid name for attribute ATTR, or zero if not. We try both `text' and `__text__', ATTR may be either one. */ /* ??? It might be a reasonable simplification to require ATTR to be only `text'. One might then also require attribute lists to be stored in their canonicalized form. */ int is_attribute_p (attr, ident) char *attr; tree ident; { int ident_len, attr_len; char *p; if (TREE_CODE (ident) != IDENTIFIER_NODE) return 0; if (strcmp (attr, IDENTIFIER_POINTER (ident)) == 0) return 1; p = IDENTIFIER_POINTER (ident); ident_len = strlen (p); attr_len = strlen (attr); /* If ATTR is `__text__', IDENT must be `text'; and vice versa. */ if (attr[0] == '_') { if (attr[1] != '_' || attr[attr_len - 2] != '_' || attr[attr_len - 1] != '_') abort (); if (ident_len == attr_len - 4 && strncmp (attr + 2, p, attr_len - 4) == 0) return 1; } else { if (ident_len == attr_len + 4 && p[0] == '_' && p[1] == '_' && p[ident_len - 2] == '_' && p[ident_len - 1] == '_' && strncmp (attr, p + 2, attr_len) == 0) return 1; } return 0; } /* Given an attribute name and a list of attributes, return a pointer to the attribute's list element if the attribute is part of the list, or NULL_TREE if not found. */ tree lookup_attribute (attr_name, list) char *attr_name; tree list; { tree l; for (l = list; l; l = TREE_CHAIN (l)) { if (TREE_CODE (TREE_PURPOSE (l)) != IDENTIFIER_NODE) abort (); if (is_attribute_p (attr_name, TREE_PURPOSE (l))) return l; } return NULL_TREE; } /* Return an attribute list that is the union of a1 and a2. */ tree merge_attributes (a1, a2) register tree a1, a2; { tree attributes; /* Either one unset? Take the set one. */ if (! (attributes = a1)) attributes = a2; /* One that completely contains the other? Take it. */ else if (a2 && ! attribute_list_contained (a1, a2)) { if (attribute_list_contained (a2, a1)) attributes = a2; else { /* Pick the longest list, and hang on the other list. */ /* ??? For the moment we punt on the issue of attrs with args. */ if (list_length (a1) < list_length (a2)) attributes = a2, a2 = a1; for (; a2; a2 = TREE_CHAIN (a2)) if (lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2)), attributes) == NULL_TREE) { a1 = copy_node (a2); TREE_CHAIN (a1) = attributes; attributes = a1; } } } return attributes; } /* Given types T1 and T2, merge their attributes and return the result. */ tree merge_machine_type_attributes (t1, t2) tree t1, t2; { #ifdef MERGE_MACHINE_TYPE_ATTRIBUTES return MERGE_MACHINE_TYPE_ATTRIBUTES (t1, t2); #else return merge_attributes (TYPE_ATTRIBUTES (t1), TYPE_ATTRIBUTES (t2)); #endif } /* Given decls OLDDECL and NEWDECL, merge their attributes and return the result. */ tree merge_machine_decl_attributes (olddecl, newdecl) tree olddecl, newdecl; { #ifdef MERGE_MACHINE_DECL_ATTRIBUTES return MERGE_MACHINE_DECL_ATTRIBUTES (olddecl, newdecl); #else return merge_attributes (DECL_MACHINE_ATTRIBUTES (olddecl), DECL_MACHINE_ATTRIBUTES (newdecl)); #endif } /* Set the type qualifiers for TYPE to TYPE_QUALS, which is a bitmask of the various TYPE_QUAL values. */ static void set_type_quals (type, type_quals) tree type; int type_quals; { TYPE_READONLY (type) = (type_quals & TYPE_QUAL_CONST) != 0; TYPE_VOLATILE (type) = (type_quals & TYPE_QUAL_VOLATILE) != 0; TYPE_RESTRICT (type) = (type_quals & TYPE_QUAL_RESTRICT) != 0; } /* Given a type node TYPE and a TYPE_QUALIFIER_SET, return a type for the same kind of data as TYPE describes. Variants point to the "main variant" (which has no qualifiers set) via TYPE_MAIN_VARIANT, and it points to a chain of other variants so that duplicate variants are never made. Only main variants should ever appear as types of expressions. */ tree build_qualified_type (type, type_quals) tree type; int type_quals; { register tree t; /* Search the chain of variants to see if there is already one there just like the one we need to have. If so, use that existing one. We must preserve the TYPE_NAME, since there is code that depends on this. */ for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t)) if (TYPE_QUALS (t) == type_quals && TYPE_NAME (t) == TYPE_NAME (type)) return t; /* We need a new one. */ t = build_type_copy (type); set_type_quals (t, type_quals); return t; } /* Create a new variant of TYPE, equivalent but distinct. This is so the caller can modify it. */ tree build_type_copy (type) tree type; { register tree t, m = TYPE_MAIN_VARIANT (type); register struct obstack *ambient_obstack = current_obstack; current_obstack = TYPE_OBSTACK (type); t = copy_node (type); current_obstack = ambient_obstack; TYPE_POINTER_TO (t) = 0; TYPE_REFERENCE_TO (t) = 0; /* Add this type to the chain of variants of TYPE. */ TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (m); TYPE_NEXT_VARIANT (m) = t; return t; } /* Hashing of types so that we don't make duplicates. The entry point is `type_hash_canon'. */ /* Each hash table slot is a bucket containing a chain of these structures. */ struct type_hash { struct type_hash *next; /* Next structure in the bucket. */ int hashcode; /* Hash code of this type. */ tree type; /* The type recorded here. */ }; /* Now here is the hash table. When recording a type, it is added to the slot whose index is the hash code mod the table size. Note that the hash table is used for several kinds of types (function types, array types and array index range types, for now). While all these live in the same table, they are completely independent, and the hash code is computed differently for each of these. */ #define TYPE_HASH_SIZE 59 struct type_hash *type_hash_table[TYPE_HASH_SIZE]; /* Compute a hash code for a list of types (chain of TREE_LIST nodes with types in the TREE_VALUE slots), by adding the hash codes of the individual types. */ int type_hash_list (list) tree list; { register int hashcode; register tree tail; for (hashcode = 0, tail = list; tail; tail = TREE_CHAIN (tail)) hashcode += TYPE_HASH (TREE_VALUE (tail)); return hashcode; } /* Look in the type hash table for a type isomorphic to TYPE. If one is found, return it. Otherwise return 0. */ tree type_hash_lookup (hashcode, type) int hashcode; tree type; { register struct type_hash *h; for (h = type_hash_table[hashcode % TYPE_HASH_SIZE]; h; h = h->next) if (h->hashcode == hashcode && TREE_CODE (h->type) == TREE_CODE (type) && TREE_TYPE (h->type) == TREE_TYPE (type) && attribute_list_equal (TYPE_ATTRIBUTES (h->type), TYPE_ATTRIBUTES (type)) && (TYPE_MAX_VALUE (h->type) == TYPE_MAX_VALUE (type) || tree_int_cst_equal (TYPE_MAX_VALUE (h->type), TYPE_MAX_VALUE (type))) && (TYPE_MIN_VALUE (h->type) == TYPE_MIN_VALUE (type) || tree_int_cst_equal (TYPE_MIN_VALUE (h->type), TYPE_MIN_VALUE (type))) /* Note that TYPE_DOMAIN is TYPE_ARG_TYPES for FUNCTION_TYPE. */ && (TYPE_DOMAIN (h->type) == TYPE_DOMAIN (type) || (TYPE_DOMAIN (h->type) && TREE_CODE (TYPE_DOMAIN (h->type)) == TREE_LIST && TYPE_DOMAIN (type) && TREE_CODE (TYPE_DOMAIN (type)) == TREE_LIST && type_list_equal (TYPE_DOMAIN (h->type), TYPE_DOMAIN (type))))) return h->type; return 0; } /* Add an entry to the type-hash-table for a type TYPE whose hash code is HASHCODE. */ void type_hash_add (hashcode, type) int hashcode; tree type; { register struct type_hash *h; h = (struct type_hash *) oballoc (sizeof (struct type_hash)); h->hashcode = hashcode; h->type = type; h->next = type_hash_table[hashcode % TYPE_HASH_SIZE]; type_hash_table[hashcode % TYPE_HASH_SIZE] = h; } /* Given TYPE, and HASHCODE its hash code, return the canonical object for an identical type if one already exists. Otherwise, return TYPE, and record it as the canonical object if it is a permanent object. To use this function, first create a type of the sort you want. Then compute its hash code from the fields of the type that make it different from other similar types. Then call this function and use the value. This function frees the type you pass in if it is a duplicate. */ /* Set to 1 to debug without canonicalization. Never set by program. */ int debug_no_type_hash = 0; tree type_hash_canon (hashcode, type) int hashcode; tree type; { tree t1; if (debug_no_type_hash) return type; t1 = type_hash_lookup (hashcode, type); if (t1 != 0) { obstack_free (TYPE_OBSTACK (type), type); #ifdef GATHER_STATISTICS tree_node_counts[(int)t_kind]--; tree_node_sizes[(int)t_kind] -= sizeof (struct tree_type); #endif return t1; } /* If this is a permanent type, record it for later reuse. */ if (TREE_PERMANENT (type)) type_hash_add (hashcode, type); return type; } /* Compute a hash code for a list of attributes (chain of TREE_LIST nodes with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots), by adding the hash codes of the individual attributes. */ int attribute_hash_list (list) tree list; { register int hashcode; register tree tail; for (hashcode = 0, tail = list; tail; tail = TREE_CHAIN (tail)) /* ??? Do we want to add in TREE_VALUE too? */ hashcode += TYPE_HASH (TREE_PURPOSE (tail)); return hashcode; } /* Given two lists of attributes, return true if list l2 is equivalent to l1. */ int attribute_list_equal (l1, l2) tree l1, l2; { return attribute_list_contained (l1, l2) && attribute_list_contained (l2, l1); } /* Given two lists of attributes, return true if list L2 is completely contained within L1. */ /* ??? This would be faster if attribute names were stored in a canonicalized form. Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method must be used to show these elements are equivalent (which they are). */ /* ??? It's not clear that attributes with arguments will always be handled correctly. */ int attribute_list_contained (l1, l2) tree l1, l2; { register tree t1, t2; /* First check the obvious, maybe the lists are identical. */ if (l1 == l2) return 1; /* Maybe the lists are similar. */ for (t1 = l1, t2 = l2; t1 && t2 && TREE_PURPOSE (t1) == TREE_PURPOSE (t2) && TREE_VALUE (t1) == TREE_VALUE (t2); t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2)); /* Maybe the lists are equal. */ if (t1 == 0 && t2 == 0) return 1; for (; t2; t2 = TREE_CHAIN (t2)) { tree attr = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2)), l1); if (attr == NULL_TREE) return 0; if (simple_cst_equal (TREE_VALUE (t2), TREE_VALUE (attr)) != 1) return 0; } return 1; } /* Given two lists of types (chains of TREE_LIST nodes with types in the TREE_VALUE slots) return 1 if the lists contain the same types in the same order. Also, the TREE_PURPOSEs must match. */ int type_list_equal (l1, l2) tree l1, l2; { register tree t1, t2; for (t1 = l1, t2 = l2; t1 && t2; t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2)) if (TREE_VALUE (t1) != TREE_VALUE (t2) || (TREE_PURPOSE (t1) != TREE_PURPOSE (t2) && ! (1 == simple_cst_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2)) && (TREE_TYPE (TREE_PURPOSE (t1)) == TREE_TYPE (TREE_PURPOSE (t2)))))) return 0; return t1 == t2; } /* Nonzero if integer constants T1 and T2 represent the same constant value. */ int tree_int_cst_equal (t1, t2) tree t1, t2; { if (t1 == t2) return 1; if (t1 == 0 || t2 == 0) return 0; if (TREE_CODE (t1) == INTEGER_CST && TREE_CODE (t2) == INTEGER_CST && TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2) && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2)) return 1; return 0; } /* Nonzero if integer constants T1 and T2 represent values that satisfy <. The precise way of comparison depends on their data type. */ int tree_int_cst_lt (t1, t2) tree t1, t2; { if (t1 == t2) return 0; if (!TREE_UNSIGNED (TREE_TYPE (t1))) return INT_CST_LT (t1, t2); return INT_CST_LT_UNSIGNED (t1, t2); } /* Return an indication of the sign of the integer constant T. The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0. Note that -1 will never be returned it T's type is unsigned. */ int tree_int_cst_sgn (t) tree t; { if (TREE_INT_CST_LOW (t) == 0 && TREE_INT_CST_HIGH (t) == 0) return 0; else if (TREE_UNSIGNED (TREE_TYPE (t))) return 1; else if (TREE_INT_CST_HIGH (t) < 0) return -1; else return 1; } /* Compare two constructor-element-type constants. Return 1 if the lists are known to be equal; otherwise return 0. */ int simple_cst_list_equal (l1, l2) tree l1, l2; { while (l1 != NULL_TREE && l2 != NULL_TREE) { if (simple_cst_equal (TREE_VALUE (l1), TREE_VALUE (l2)) != 1) return 0; l1 = TREE_CHAIN (l1); l2 = TREE_CHAIN (l2); } return (l1 == l2); } /* Return truthvalue of whether T1 is the same tree structure as T2. Return 1 if they are the same. Return 0 if they are understandably different. Return -1 if either contains tree structure not understood by this function. */ int simple_cst_equal (t1, t2) tree t1, t2; { register enum tree_code code1, code2; int cmp; if (t1 == t2) return 1; if (t1 == 0 || t2 == 0) return 0; code1 = TREE_CODE (t1); code2 = TREE_CODE (t2); if (code1 == NOP_EXPR || code1 == CONVERT_EXPR || code1 == NON_LVALUE_EXPR) { if (code2 == NOP_EXPR || code2 == CONVERT_EXPR || code2 == NON_LVALUE_EXPR) return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0)); else return simple_cst_equal (TREE_OPERAND (t1, 0), t2); } else if (code2 == NOP_EXPR || code2 == CONVERT_EXPR || code2 == NON_LVALUE_EXPR) return simple_cst_equal (t1, TREE_OPERAND (t2, 0)); if (code1 != code2) return 0; switch (code1) { case INTEGER_CST: return TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2) && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2); case REAL_CST: return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2)); case STRING_CST: return TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2) && !bcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2), TREE_STRING_LENGTH (t1)); case CONSTRUCTOR: if (CONSTRUCTOR_ELTS (t1) == CONSTRUCTOR_ELTS (t2)) return 1; else abort (); case SAVE_EXPR: return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0)); case CALL_EXPR: cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0)); if (cmp <= 0) return cmp; return simple_cst_list_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)); case TARGET_EXPR: /* Special case: if either target is an unallocated VAR_DECL, it means that it's going to be unified with whatever the TARGET_EXPR is really supposed to initialize, so treat it as being equivalent to anything. */ if ((TREE_CODE (TREE_OPERAND (t1, 0)) == VAR_DECL && DECL_NAME (TREE_OPERAND (t1, 0)) == NULL_TREE && DECL_RTL (TREE_OPERAND (t1, 0)) == 0) || (TREE_CODE (TREE_OPERAND (t2, 0)) == VAR_DECL && DECL_NAME (TREE_OPERAND (t2, 0)) == NULL_TREE && DECL_RTL (TREE_OPERAND (t2, 0)) == 0)) cmp = 1; else cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0)); if (cmp <= 0) return cmp; return simple_cst_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)); case WITH_CLEANUP_EXPR: cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0)); if (cmp <= 0) return cmp; return simple_cst_equal (TREE_OPERAND (t1, 2), TREE_OPERAND (t1, 2)); case COMPONENT_REF: if (TREE_OPERAND (t1, 1) == TREE_OPERAND (t2, 1)) return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0)); return 0; case VAR_DECL: case PARM_DECL: case CONST_DECL: case FUNCTION_DECL: return 0; default: break; } /* This general rule works for most tree codes. All exceptions should be handled above. If this is a language-specific tree code, we can't trust what might be in the operand, so say we don't know the situation. */ if ((int) code1 >= (int) LAST_AND_UNUSED_TREE_CODE) return -1; switch (TREE_CODE_CLASS (code1)) { int i; case '1': case '2': case '<': case 'e': case 'r': case 's': cmp = 1; for (i=0; i> 1; maxint = (int) (highint - lowint); return type_hash_canon (maxint < 0 ? ~maxint : maxint, itype); } else return itype; } /* Just like build_index_type, but takes lowval and highval instead of just highval (maxval). */ tree build_index_2_type (lowval,highval) tree lowval, highval; { return build_range_type (NULL_TREE, lowval, highval); } /* Return nonzero iff ITYPE1 and ITYPE2 are equal (in the LISP sense). Needed because when index types are not hashed, equal index types built at different times appear distinct, even though structurally, they are not. */ int index_type_equal (itype1, itype2) tree itype1, itype2; { if (TREE_CODE (itype1) != TREE_CODE (itype2)) return 0; if (TREE_CODE (itype1) == INTEGER_TYPE) { if (TYPE_PRECISION (itype1) != TYPE_PRECISION (itype2) || TYPE_MODE (itype1) != TYPE_MODE (itype2) || simple_cst_equal (TYPE_SIZE (itype1), TYPE_SIZE (itype2)) != 1 || TYPE_ALIGN (itype1) != TYPE_ALIGN (itype2)) return 0; if (1 == simple_cst_equal (TYPE_MIN_VALUE (itype1), TYPE_MIN_VALUE (itype2)) && 1 == simple_cst_equal (TYPE_MAX_VALUE (itype1), TYPE_MAX_VALUE (itype2))) return 1; } return 0; } /* Construct, lay out and return the type of arrays of elements with ELT_TYPE and number of elements specified by the range of values of INDEX_TYPE. If such a type has already been constructed, reuse it. */ tree build_array_type (elt_type, index_type) tree elt_type, index_type; { register tree t; int hashcode; if (TREE_CODE (elt_type) == FUNCTION_TYPE) { error ("arrays of functions are not meaningful"); elt_type = integer_type_node; } /* Make sure TYPE_POINTER_TO (elt_type) is filled in. */ build_pointer_type (elt_type); /* Allocate the array after the pointer type, in case we free it in type_hash_canon. */ t = make_node (ARRAY_TYPE); TREE_TYPE (t) = elt_type; TYPE_DOMAIN (t) = index_type; if (index_type == 0) { return t; } hashcode = TYPE_HASH (elt_type) + TYPE_HASH (index_type); t = type_hash_canon (hashcode, t); if (TYPE_SIZE (t) == 0) layout_type (t); return t; } /* Return the TYPE of the elements comprising the innermost dimension of ARRAY. */ tree get_inner_array_type (array) tree array; { tree type = TREE_TYPE (array); while (TREE_CODE (type) == ARRAY_TYPE) type = TREE_TYPE (type); return type; } /* Construct, lay out and return the type of functions returning type VALUE_TYPE given arguments of types ARG_TYPES. ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs are data type nodes for the arguments of the function. If such a type has already been constructed, reuse it. */ tree build_function_type (value_type, arg_types) tree value_type, arg_types; { register tree t; int hashcode; if (TREE_CODE (value_type) == FUNCTION_TYPE) { error ("function return type cannot be function"); value_type = integer_type_node; } /* Make a node of the sort we want. */ t = make_node (FUNCTION_TYPE); TREE_TYPE (t) = value_type; TYPE_ARG_TYPES (t) = arg_types; /* If we already have such a type, use the old one and free this one. */ hashcode = TYPE_HASH (value_type) + type_hash_list (arg_types); t = type_hash_canon (hashcode, t); if (TYPE_SIZE (t) == 0) layout_type (t); return t; } /* Build the node for the type of references-to-TO_TYPE. */ tree build_reference_type (to_type) tree to_type; { register tree t = TYPE_REFERENCE_TO (to_type); /* First, if we already have a type for pointers to TO_TYPE, use it. */ if (t) return t; /* We need a new one. Put this in the same obstack as TO_TYPE. */ push_obstacks (TYPE_OBSTACK (to_type), TYPE_OBSTACK (to_type)); t = make_node (REFERENCE_TYPE); pop_obstacks (); TREE_TYPE (t) = to_type; /* Record this type as the pointer to TO_TYPE. */ TYPE_REFERENCE_TO (to_type) = t; layout_type (t); return t; } /* Construct, lay out and return the type of methods belonging to class BASETYPE and whose arguments and values are described by TYPE. If that type exists already, reuse it. TYPE must be a FUNCTION_TYPE node. */ tree build_method_type (basetype, type) tree basetype, type; { register tree t; int hashcode; /* Make a node of the sort we want. */ t = make_node (METHOD_TYPE); if (TREE_CODE (type) != FUNCTION_TYPE) abort (); TYPE_METHOD_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype); TREE_TYPE (t) = TREE_TYPE (type); /* The actual arglist for this function includes a "hidden" argument which is "this". Put it into the list of argument types. */ TYPE_ARG_TYPES (t) = tree_cons (NULL_TREE, build_pointer_type (basetype), TYPE_ARG_TYPES (type)); /* If we already have such a type, use the old one and free this one. */ hashcode = TYPE_HASH (basetype) + TYPE_HASH (type); t = type_hash_canon (hashcode, t); if (TYPE_SIZE (t) == 0) layout_type (t); return t; } /* Construct, lay out and return the type of offsets to a value of type TYPE, within an object of type BASETYPE. If a suitable offset type exists already, reuse it. */ tree build_offset_type (basetype, type) tree basetype, type; { register tree t; int hashcode; /* Make a node of the sort we want. */ t = make_node (OFFSET_TYPE); TYPE_OFFSET_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype); TREE_TYPE (t) = type; /* If we already have such a type, use the old one and free this one. */ hashcode = TYPE_HASH (basetype) + TYPE_HASH (type); t = type_hash_canon (hashcode, t); if (TYPE_SIZE (t) == 0) layout_type (t); return t; } /* Create a complex type whose components are COMPONENT_TYPE. */ tree build_complex_type (component_type) tree component_type; { register tree t; int hashcode; /* Make a node of the sort we want. */ t = make_node (COMPLEX_TYPE); TREE_TYPE (t) = TYPE_MAIN_VARIANT (component_type); set_type_quals (t, TYPE_QUALS (component_type)); /* If we already have such a type, use the old one and free this one. */ hashcode = TYPE_HASH (component_type); t = type_hash_canon (hashcode, t); if (TYPE_SIZE (t) == 0) layout_type (t); return t; } /* Return OP, stripped of any conversions to wider types as much as is safe. Converting the value back to OP's type makes a value equivalent to OP. If FOR_TYPE is nonzero, we return a value which, if converted to type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE. If FOR_TYPE is nonzero, unaligned bit-field references may be changed to the narrowest type that can hold the value, even if they don't exactly fit. Otherwise, bit-field references are changed to a narrower type only if they can be fetched directly from memory in that type. OP must have integer, real or enumeral type. Pointers are not allowed! There are some cases where the obvious value we could return would regenerate to OP if converted to OP's type, but would not extend like OP to wider types. If FOR_TYPE indicates such extension is contemplated, we eschew such values. For example, if OP is (unsigned short)(signed char)-1, we avoid returning (signed char)-1 if FOR_TYPE is int, even though extending that to an unsigned short would regenerate OP, since the result of extending (signed char)-1 to (int) is different from (int) OP. */ tree get_unwidened (op, for_type) register tree op; tree for_type; { /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension. */ register tree type = TREE_TYPE (op); register unsigned final_prec = TYPE_PRECISION (for_type != 0 ? for_type : type); register int uns = (for_type != 0 && for_type != type && final_prec > TYPE_PRECISION (type) && TREE_UNSIGNED (type)); register tree win = op; while (TREE_CODE (op) == NOP_EXPR) { register int bitschange = TYPE_PRECISION (TREE_TYPE (op)) - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0))); /* Truncations are many-one so cannot be removed. Unless we are later going to truncate down even farther. */ if (bitschange < 0 && final_prec > TYPE_PRECISION (TREE_TYPE (op))) break; /* See what's inside this conversion. If we decide to strip it, we will set WIN. */ op = TREE_OPERAND (op, 0); /* If we have not stripped any zero-extensions (uns is 0), we can strip any kind of extension. If we have previously stripped a zero-extension, only zero-extensions can safely be stripped. Any extension can be stripped if the bits it would produce are all going to be discarded later by truncating to FOR_TYPE. */ if (bitschange > 0) { if (! uns || final_prec <= TYPE_PRECISION (TREE_TYPE (op))) win = op; /* TREE_UNSIGNED says whether this is a zero-extension. Let's avoid computing it if it does not affect WIN and if UNS will not be needed again. */ if ((uns || TREE_CODE (op) == NOP_EXPR) && TREE_UNSIGNED (TREE_TYPE (op))) { uns = 1; win = op; } } } if (TREE_CODE (op) == COMPONENT_REF /* Since type_for_size always gives an integer type. */ && TREE_CODE (type) != REAL_TYPE /* Don't crash if field not laid out yet. */ && DECL_SIZE (TREE_OPERAND (op, 1)) != 0) { unsigned innerprec = TREE_INT_CST_LOW (DECL_SIZE (TREE_OPERAND (op, 1))); type = type_for_size (innerprec, TREE_UNSIGNED (TREE_OPERAND (op, 1))); /* We can get this structure field in the narrowest type it fits in. If FOR_TYPE is 0, do this only for a field that matches the narrower type exactly and is aligned for it The resulting extension to its nominal type (a fullword type) must fit the same conditions as for other extensions. */ if (innerprec < TYPE_PRECISION (TREE_TYPE (op)) && (for_type || ! DECL_BIT_FIELD (TREE_OPERAND (op, 1))) && (! uns || final_prec <= innerprec || TREE_UNSIGNED (TREE_OPERAND (op, 1))) && type != 0) { win = build (COMPONENT_REF, type, TREE_OPERAND (op, 0), TREE_OPERAND (op, 1)); TREE_SIDE_EFFECTS (win) = TREE_SIDE_EFFECTS (op); TREE_THIS_VOLATILE (win) = TREE_THIS_VOLATILE (op); TREE_RAISES (win) = TREE_RAISES (op); } } return win; } /* Return OP or a simpler expression for a narrower value which can be sign-extended or zero-extended to give back OP. Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended or 0 if the value should be sign-extended. */ tree get_narrower (op, unsignedp_ptr) register tree op; int *unsignedp_ptr; { register int uns = 0; int first = 1; register tree win = op; while (TREE_CODE (op) == NOP_EXPR) { register int bitschange = TYPE_PRECISION (TREE_TYPE (op)) - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0))); /* Truncations are many-one so cannot be removed. */ if (bitschange < 0) break; /* See what's inside this conversion. If we decide to strip it, we will set WIN. */ op = TREE_OPERAND (op, 0); if (bitschange > 0) { /* An extension: the outermost one can be stripped, but remember whether it is zero or sign extension. */ if (first) uns = TREE_UNSIGNED (TREE_TYPE (op)); /* Otherwise, if a sign extension has been stripped, only sign extensions can now be stripped; if a zero extension has been stripped, only zero-extensions. */ else if (uns != TREE_UNSIGNED (TREE_TYPE (op))) break; first = 0; } else /* bitschange == 0 */ { /* A change in nominal type can always be stripped, but we must preserve the unsignedness. */ if (first) uns = TREE_UNSIGNED (TREE_TYPE (op)); first = 0; } win = op; } if (TREE_CODE (op) == COMPONENT_REF /* Since type_for_size always gives an integer type. */ && TREE_CODE (TREE_TYPE (op)) != REAL_TYPE) { unsigned innerprec = TREE_INT_CST_LOW (DECL_SIZE (TREE_OPERAND (op, 1))); tree type = type_for_size (innerprec, TREE_UNSIGNED (op)); /* We can get this structure field in a narrower type that fits it, but the resulting extension to its nominal type (a fullword type) must satisfy the same conditions as for other extensions. Do this only for fields that are aligned (not bit-fields), because when bit-field insns will be used there is no advantage in doing this. */ if (innerprec < TYPE_PRECISION (TREE_TYPE (op)) && ! DECL_BIT_FIELD (TREE_OPERAND (op, 1)) && (first || uns == TREE_UNSIGNED (TREE_OPERAND (op, 1))) && type != 0) { if (first) uns = TREE_UNSIGNED (TREE_OPERAND (op, 1)); win = build (COMPONENT_REF, type, TREE_OPERAND (op, 0), TREE_OPERAND (op, 1)); TREE_SIDE_EFFECTS (win) = TREE_SIDE_EFFECTS (op); TREE_THIS_VOLATILE (win) = TREE_THIS_VOLATILE (op); TREE_RAISES (win) = TREE_RAISES (op); } } *unsignedp_ptr = uns; return win; } /* Nonzero if integer constant C has a value that is permissible for type TYPE (an INTEGER_TYPE). */ int int_fits_type_p (c, type) tree c, type; { if (TREE_UNSIGNED (type)) return (! (TREE_CODE (TYPE_MAX_VALUE (type)) == INTEGER_CST && INT_CST_LT_UNSIGNED (TYPE_MAX_VALUE (type), c)) && ! (TREE_CODE (TYPE_MIN_VALUE (type)) == INTEGER_CST && INT_CST_LT_UNSIGNED (c, TYPE_MIN_VALUE (type))) /* Negative ints never fit unsigned types. */ && ! (TREE_INT_CST_HIGH (c) < 0 && ! TREE_UNSIGNED (TREE_TYPE (c)))); else return (! (TREE_CODE (TYPE_MAX_VALUE (type)) == INTEGER_CST && INT_CST_LT (TYPE_MAX_VALUE (type), c)) && ! (TREE_CODE (TYPE_MIN_VALUE (type)) == INTEGER_CST && INT_CST_LT (c, TYPE_MIN_VALUE (type))) /* Unsigned ints with top bit set never fit signed types. */ && ! (TREE_INT_CST_HIGH (c) < 0 && TREE_UNSIGNED (TREE_TYPE (c)))); } /* Return the innermost context enclosing DECL that is a FUNCTION_DECL, or zero if none. */ tree decl_function_context (decl) tree decl; { tree context; if (TREE_CODE (decl) == ERROR_MARK) return 0; if (TREE_CODE (decl) == SAVE_EXPR) context = SAVE_EXPR_CONTEXT (decl); else context = DECL_CONTEXT (decl); while (context && TREE_CODE (context) != FUNCTION_DECL) { if (TREE_CODE_CLASS (TREE_CODE (context)) == 't') context = TYPE_CONTEXT (context); else if (TREE_CODE_CLASS (TREE_CODE (context)) == 'd') context = DECL_CONTEXT (context); else if (TREE_CODE (context) == BLOCK) context = BLOCK_SUPERCONTEXT (context); else /* Unhandled CONTEXT !? */ abort (); } return context; } /* Return the innermost context enclosing DECL that is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none. TYPE_DECLs and FUNCTION_DECLs are transparent to this function. */ tree decl_type_context (decl) tree decl; { tree context = DECL_CONTEXT (decl); while (context) { if (TREE_CODE (context) == RECORD_TYPE || TREE_CODE (context) == UNION_TYPE || TREE_CODE (context) == QUAL_UNION_TYPE) return context; if (TREE_CODE (context) == TYPE_DECL || TREE_CODE (context) == FUNCTION_DECL) context = DECL_CONTEXT (context); else if (TREE_CODE (context) == BLOCK) context = BLOCK_SUPERCONTEXT (context); else /* Unhandled CONTEXT!? */ abort (); } return NULL_TREE; } /* Print debugging information about the size of the toplev_inline_obstacks. */ void print_inline_obstack_statistics () { struct simple_obstack_stack *current = toplev_inline_obstacks; int n_obstacks = 0; int n_alloc = 0; int n_chunks = 0; for (; current; current = current->next, ++n_obstacks) { struct obstack *o = current->obstack; struct _obstack_chunk *chunk = o->chunk; n_alloc += o->next_free - chunk->contents; chunk = chunk->prev; ++n_chunks; for (; chunk; chunk = chunk->prev, ++n_chunks) n_alloc += chunk->limit - &chunk->contents[0]; } fprintf (stderr, "inline obstacks: %d obstacks, %d bytes, %d chunks\n", n_obstacks, n_alloc, n_chunks); } /* Print debugging information about the obstack O, named STR. */ void print_obstack_statistics (str, o) char *str; struct obstack *o; { struct _obstack_chunk *chunk = o->chunk; int n_chunks = 1; int n_alloc = 0; n_alloc += o->next_free - chunk->contents; chunk = chunk->prev; while (chunk) { n_chunks += 1; n_alloc += chunk->limit - &chunk->contents[0]; chunk = chunk->prev; } fprintf (stderr, "obstack %s: %u bytes, %d chunks\n", str, n_alloc, n_chunks); } /* Print debugging information about tree nodes generated during the compile, and any language-specific information. */ void dump_tree_statistics () { #ifdef GATHER_STATISTICS int i; int total_nodes, total_bytes; #endif fprintf (stderr, "\n??? tree nodes created\n\n"); #ifdef GATHER_STATISTICS fprintf (stderr, "Kind Nodes Bytes\n"); fprintf (stderr, "-------------------------------------\n"); total_nodes = total_bytes = 0; for (i = 0; i < (int) all_kinds; i++) { fprintf (stderr, "%-20s %6d %9d\n", tree_node_kind_names[i], tree_node_counts[i], tree_node_sizes[i]); total_nodes += tree_node_counts[i]; total_bytes += tree_node_sizes[i]; } fprintf (stderr, "%-20s %9d\n", "identifier names", id_string_size); fprintf (stderr, "-------------------------------------\n"); fprintf (stderr, "%-20s %6d %9d\n", "Total", total_nodes, total_bytes); fprintf (stderr, "-------------------------------------\n"); #else fprintf (stderr, "(No per-node statistics)\n"); #endif print_obstack_statistics ("permanent_obstack", &permanent_obstack); print_obstack_statistics ("maybepermanent_obstack", &maybepermanent_obstack); print_obstack_statistics ("temporary_obstack", &temporary_obstack); print_obstack_statistics ("momentary_obstack", &momentary_obstack); print_obstack_statistics ("temp_decl_obstack", &temp_decl_obstack); print_inline_obstack_statistics (); print_lang_statistics (); } #define FILE_FUNCTION_PREFIX_LEN 9 #ifndef NO_DOLLAR_IN_LABEL #define FILE_FUNCTION_FORMAT "_GLOBAL_$%s$%s" #else /* NO_DOLLAR_IN_LABEL */ #ifndef NO_DOT_IN_LABEL #define FILE_FUNCTION_FORMAT "_GLOBAL_.%s.%s" #else /* NO_DOT_IN_LABEL */ #define FILE_FUNCTION_FORMAT "_GLOBAL__%s_%s" #endif /* NO_DOT_IN_LABEL */ #endif /* NO_DOLLAR_IN_LABEL */ extern char * first_global_object_name; extern char * weak_global_object_name; /* Appends 6 random characters to TEMPLATE to (hopefully) avoid name clashes in cases where we can't reliably choose a unique name. Derived from mkstemp.c in libiberty. */ static void append_random_chars (template) char *template; { static const char letters[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; static unsigned HOST_WIDE_INT value; unsigned HOST_WIDE_INT v; #ifdef HAVE_GETTIMEOFDAY struct timeval tv; #endif template += strlen (template); #ifdef HAVE_GETTIMEOFDAY /* Get some more or less random data. */ gettimeofday (&tv, NULL); value += ((unsigned HOST_WIDE_INT) tv.tv_usec << 16) ^ tv.tv_sec ^ getpid (); #else value += getpid (); #endif v = value; /* Fill in the random bits. */ template[0] = letters[v % 62]; v /= 62; template[1] = letters[v % 62]; v /= 62; template[2] = letters[v % 62]; v /= 62; template[3] = letters[v % 62]; v /= 62; template[4] = letters[v % 62]; v /= 62; template[5] = letters[v % 62]; template[6] = '\0'; } /* Generate a name for a function unique to this translation unit. TYPE is some string to identify the purpose of this function to the linker or collect2. */ tree get_file_function_name_long (type) char *type; { char *buf; register char *p; if (first_global_object_name) p = first_global_object_name; else { /* We don't have anything that we know to be unique to this translation unit, so use what we do have and throw in some randomness. */ char *name = weak_global_object_name; char *file = main_input_filename; if (! name) name = ""; if (! file) file = input_filename; p = (char *) alloca (7 + strlen (name) + strlen (file)); sprintf (p, "%s%s", name, file); append_random_chars (p); } buf = (char *) alloca (sizeof (FILE_FUNCTION_FORMAT) + strlen (p) + strlen (type)); /* Set up the name of the file-level functions we may need. */ /* Use a global object (which is already required to be unique over the program) rather than the file name (which imposes extra constraints). -- Raeburn@MIT.EDU, 10 Jan 1990. */ sprintf (buf, FILE_FUNCTION_FORMAT, type, p); /* Don't need to pull weird characters out of global names. */ if (p != first_global_object_name) { for (p = buf+11; *p; p++) if (! ((*p >= '0' && *p <= '9') #if 0 /* we always want labels, which are valid C++ identifiers (+ `$') */ #ifndef ASM_IDENTIFY_GCC /* this is required if `.' is invalid -- k. raeburn */ || *p == '.' #endif #endif #ifndef NO_DOLLAR_IN_LABEL /* this for `$'; unlikely, but... -- kr */ || *p == '$' #endif #ifndef NO_DOT_IN_LABEL /* this for `.'; unlikely, but... */ || *p == '.' #endif || (*p >= 'A' && *p <= 'Z') || (*p >= 'a' && *p <= 'z'))) *p = '_'; } return get_identifier (buf); } /* If KIND=='I', return a suitable global initializer (constructor) name. If KIND=='D', return a suitable global clean-up (destructor) name. */ tree get_file_function_name (kind) int kind; { char p[2]; p[0] = kind; p[1] = 0; return get_file_function_name_long (p); } /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node. The result is placed in BUFFER (which has length BIT_SIZE), with one bit in each char ('\000' or '\001'). If the constructor is constant, NULL_TREE is returned. Otherwise, a TREE_LIST of the non-constant elements is emitted. */ tree get_set_constructor_bits (init, buffer, bit_size) tree init; char *buffer; int bit_size; { int i; tree vals; HOST_WIDE_INT domain_min = TREE_INT_CST_LOW (TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (init)))); tree non_const_bits = NULL_TREE; for (i = 0; i < bit_size; i++) buffer[i] = 0; for (vals = TREE_OPERAND (init, 1); vals != NULL_TREE; vals = TREE_CHAIN (vals)) { if (TREE_CODE (TREE_VALUE (vals)) != INTEGER_CST || (TREE_PURPOSE (vals) != NULL_TREE && TREE_CODE (TREE_PURPOSE (vals)) != INTEGER_CST)) non_const_bits = tree_cons (TREE_PURPOSE (vals), TREE_VALUE (vals), non_const_bits); else if (TREE_PURPOSE (vals) != NULL_TREE) { /* Set a range of bits to ones. */ HOST_WIDE_INT lo_index = TREE_INT_CST_LOW (TREE_PURPOSE (vals)) - domain_min; HOST_WIDE_INT hi_index = TREE_INT_CST_LOW (TREE_VALUE (vals)) - domain_min; if (lo_index < 0 || lo_index >= bit_size || hi_index < 0 || hi_index >= bit_size) abort (); for ( ; lo_index <= hi_index; lo_index++) buffer[lo_index] = 1; } else { /* Set a single bit to one. */ HOST_WIDE_INT index = TREE_INT_CST_LOW (TREE_VALUE (vals)) - domain_min; if (index < 0 || index >= bit_size) { error ("invalid initializer for bit string"); return NULL_TREE; } buffer[index] = 1; } } return non_const_bits; } /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node. The result is placed in BUFFER (which is an array of bytes). If the constructor is constant, NULL_TREE is returned. Otherwise, a TREE_LIST of the non-constant elements is emitted. */ tree get_set_constructor_bytes (init, buffer, wd_size) tree init; unsigned char *buffer; int wd_size; { int i; int set_word_size = BITS_PER_UNIT; int bit_size = wd_size * set_word_size; int bit_pos = 0; unsigned char *bytep = buffer; char *bit_buffer = (char *) alloca(bit_size); tree non_const_bits = get_set_constructor_bits (init, bit_buffer, bit_size); for (i = 0; i < wd_size; i++) buffer[i] = 0; for (i = 0; i < bit_size; i++) { if (bit_buffer[i]) { if (BYTES_BIG_ENDIAN) *bytep |= (1 << (set_word_size - 1 - bit_pos)); else *bytep |= 1 << bit_pos; } bit_pos++; if (bit_pos >= set_word_size) bit_pos = 0, bytep++; } return non_const_bits; } #ifdef ENABLE_CHECKING /* Complain if the tree code does not match the expected one. NODE is the tree node in question, CODE is the expected tree code, and FILE and LINE are the filename and line number, respectively, of the line on which the check was done. If NONFATAL is nonzero, don't abort if the reference is invalid; instead, return 0. If the reference is valid, return NODE. */ tree tree_check (node, code, file, line, nofatal) tree node; enum tree_code code; char *file; int line; int nofatal; { if (TREE_CODE (node) == code) return node; else if (nofatal) return 0; else fatal ("%s:%d: Expect %s, have %s\n", file, line, tree_code_name[code], tree_code_name[TREE_CODE (node)]); } /* Similar to above, except that we check for a class of tree code, given in CL. */ tree tree_class_check (node, cl, file, line, nofatal) tree node; char cl; char *file; int line; int nofatal; { if (TREE_CODE_CLASS (TREE_CODE (node)) == cl) return node; else if (nofatal) return 0; else fatal ("%s:%d: Expect '%c', have '%s'\n", file, line, cl, tree_code_name[TREE_CODE (node)]); } /* Likewise, but complain if the tree node is not an expression. */ tree expr_check (node, ignored, file, line, nofatal) tree node; int ignored; char *file; int line; int nofatal; { switch (TREE_CODE_CLASS (TREE_CODE (node))) { case 'r': case 's': case 'e': case '<': case '1': case '2': break; default: if (nofatal) return 0; else fatal ("%s:%d: Expect expression, have '%s'\n", file, line, tree_code_name[TREE_CODE (node)]); } return node; } #endif /* Return the alias set for T, which may be either a type or an expression. */ int get_alias_set (t) tree t; { if (!flag_strict_aliasing || !lang_get_alias_set) /* If we're not doing any lanaguage-specific alias analysis, just assume everything aliases everything else. */ return 0; else return (*lang_get_alias_set) (t); } /* Return a brand-new alias set. */ int new_alias_set () { static int last_alias_set; if (flag_strict_aliasing) return ++last_alias_set; else return 0; }