/* Functions for generic Darwin as target machine for GNU C compiler.
- Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002, 2003
+ Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002, 2003, 2004,
+ 2005
Free Software Foundation, Inc.
Contributed by Apple Computer Inc.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+Boston, MA 02110-1301, USA. */
#include "config.h"
#include "system.h"
#include "function.h"
#include "ggc.h"
#include "langhooks.h"
+#include "target.h"
#include "tm_p.h"
-#include "errors.h"
+#include "toplev.h"
+#include "hashtab.h"
+
+/* Darwin supports a feature called fix-and-continue, which is used
+ for rapid turn around debugging. When code is compiled with the
+ -mfix-and-continue flag, two changes are made to the generated code
+ that allow the system to do things that it would normally not be
+ able to do easily. These changes allow gdb to load in
+ recompilation of a translation unit that has been changed into a
+ running program and replace existing functions and methods of that
+ translation unit with versions of those functions and methods
+ from the newly compiled translation unit. The new functions access
+ the existing static symbols from the old translation unit, if the
+ symbol existed in the unit to be replaced, and from the new
+ translation unit, otherwise.
+
+ The changes are to insert 5 nops at the beginning of all functions
+ and to use indirection to get at static symbols. The 5 nops
+ are required by consumers of the generated code. Currently, gdb
+ uses this to patch in a jump to the overriding function, this
+ allows all uses of the old name to forward to the replacement,
+ including existing function pointers and virtual methods. See
+ rs6000_emit_prologue for the code that handles the nop insertions.
+
+ The added indirection allows gdb to redirect accesses to static
+ symbols from the newly loaded translation unit to the existing
+ symbol, if any. @code{static} symbols are special and are handled by
+ setting the second word in the .non_lazy_symbol_pointer data
+ structure to symbol. See indirect_data for the code that handles
+ the extra indirection, and machopic_output_indirection and its use
+ of MACHO_SYMBOL_STATIC for the code that handles @code{static}
+ symbol indirection. */
+
+/* Section names. */
+section * darwin_sections[NUM_DARWIN_SECTIONS];
+
+/* True if we're setting __attribute__ ((ms_struct)). */
+int darwin_ms_struct = false;
+
+/* A get_unnamed_section callback used to switch to an ObjC section.
+ DIRECTIVE is as for output_section_asm_op. */
-static int machopic_data_defined_p (const char *);
-static void update_non_lazy_ptrs (const char *);
-static void update_stubs (const char *);
-static const char *machopic_non_lazy_ptr_name (const char*);
+static void
+output_objc_section_asm_op (const void *directive)
+{
+ static bool been_here = false;
+
+ if (! been_here)
+ {
+ static const enum darwin_section_enum tomark[] =
+ {
+ /* written, cold -> hot */
+ objc_cat_cls_meth_section,
+ objc_cat_inst_meth_section,
+ objc_string_object_section,
+ objc_constant_string_object_section,
+ objc_selector_refs_section,
+ objc_selector_fixup_section,
+ objc_cls_refs_section,
+ objc_class_section,
+ objc_meta_class_section,
+ /* shared, hot -> cold */
+ objc_cls_meth_section,
+ objc_inst_meth_section,
+ objc_protocol_section,
+ objc_class_names_section,
+ objc_meth_var_types_section,
+ objc_meth_var_names_section,
+ objc_category_section,
+ objc_class_vars_section,
+ objc_instance_vars_section,
+ objc_module_info_section,
+ objc_symbols_section
+ };
+ size_t i;
+
+ been_here = true;
+ for (i = 0; i < ARRAY_SIZE (tomark); i++)
+ switch_to_section (darwin_sections[tomark[i]]);
+ }
+ output_section_asm_op (directive);
+}
+
+/* Implement TARGET_ASM_INIT_SECTIONS. */
+
+void
+darwin_init_sections (void)
+{
+#define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) \
+ darwin_sections[NAME] = \
+ get_unnamed_section (FLAGS, (OBJC \
+ ? output_objc_section_asm_op \
+ : output_section_asm_op), \
+ "\t" DIRECTIVE);
+#include "config/darwin-sections.def"
+#undef DEF_SECTION
+
+ readonly_data_section = darwin_sections[const_section];
+ exception_section = darwin_sections[darwin_exception_section];
+ eh_frame_section = darwin_sections[darwin_eh_frame_section];
+}
int
name_needs_quotes (const char *name)
return 0;
}
-/*
- * flag_pic = 1 ... generate only indirections
- * flag_pic = 2 ... generate indirections and pure code
- */
-
-/* This module assumes that (const (symbol_ref "foo")) is a legal pic
- reference, which will not be changed. */
-
-static GTY(()) tree machopic_defined_list;
-
-enum machopic_addr_class
-machopic_classify_ident (tree ident)
+/* Return true if SYM_REF can be used without an indirection. */
+static int
+machopic_symbol_defined_p (rtx sym_ref)
{
- const char *name = IDENTIFIER_POINTER (ident);
- int lprefix = (((name[0] == '*' || name[0] == '&')
- && (name[1] == 'L' || (name[1] == '"' && name[2] == 'L')))
- || ( name[0] == '_'
- && name[1] == 'O'
- && name[2] == 'B'
- && name[3] == 'J'
- && name[4] == 'C'
- && name[5] == '_'));
- tree temp;
-
- /* The PIC base symbol is always defined. */
- if (! strcmp (name, "<pic base>"))
- return MACHOPIC_DEFINED_DATA;
-
- if (name[0] != '!')
+ if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_DEFINED)
+ return true;
+
+ /* If a symbol references local and is not an extern to this
+ file, then the symbol might be able to declared as defined. */
+ if (SYMBOL_REF_LOCAL_P (sym_ref) && ! SYMBOL_REF_EXTERNAL_P (sym_ref))
{
- /* Here if no special encoding to be found. */
- if (lprefix)
+ /* If the symbol references a variable and the variable is a
+ common symbol, then this symbol is not defined. */
+ if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_VARIABLE)
{
- const char *name = IDENTIFIER_POINTER (ident);
- int len = strlen (name);
-
- if ((len > 5 && !strcmp (name + len - 5, "$stub"))
- || (len > 6 && !strcmp (name + len - 6, "$stub\"")))
- return MACHOPIC_DEFINED_FUNCTION;
- return MACHOPIC_DEFINED_DATA;
+ tree decl = SYMBOL_REF_DECL (sym_ref);
+ if (!decl)
+ return true;
+ if (DECL_COMMON (decl))
+ return false;
}
+ return true;
+ }
+ return false;
+}
- for (temp = machopic_defined_list;
- temp != NULL_TREE;
- temp = TREE_CHAIN (temp))
- {
- if (ident == TREE_VALUE (temp))
- return MACHOPIC_DEFINED_DATA;
- }
+/* This module assumes that (const (symbol_ref "foo")) is a legal pic
+ reference, which will not be changed. */
- if (TREE_ASM_WRITTEN (ident))
- return MACHOPIC_DEFINED_DATA;
+enum machopic_addr_class
+machopic_classify_symbol (rtx sym_ref)
+{
+ int flags;
+ bool function_p;
+
+ flags = SYMBOL_REF_FLAGS (sym_ref);
+ function_p = SYMBOL_REF_FUNCTION_P (sym_ref);
+ if (machopic_symbol_defined_p (sym_ref))
+ return (function_p
+ ? MACHOPIC_DEFINED_FUNCTION : MACHOPIC_DEFINED_DATA);
+ else
+ return (function_p
+ ? MACHOPIC_UNDEFINED_FUNCTION : MACHOPIC_UNDEFINED_DATA);
+}
- return MACHOPIC_UNDEFINED;
- }
+#ifndef TARGET_FIX_AND_CONTINUE
+#define TARGET_FIX_AND_CONTINUE 0
+#endif
- else if (name[1] == 'D')
- return MACHOPIC_DEFINED_DATA;
+/* Indicate when fix-and-continue style code generation is being used
+ and when a reference to data should be indirected so that it can be
+ rebound in a new translation unit to reference the original instance
+ of that data. Symbol names that are for code generation local to
+ the translation unit are bound to the new translation unit;
+ currently this means symbols that begin with L or _OBJC_;
+ otherwise, we indicate that an indirect reference should be made to
+ permit the runtime to rebind new instances of the translation unit
+ to the original instance of the data. */
- else if (name[1] == 'T')
- return MACHOPIC_DEFINED_FUNCTION;
+static int
+indirect_data (rtx sym_ref)
+{
+ int lprefix;
+ const char *name;
- /* It is possible that someone is holding a "stale" name, which has
- since been defined. See if there is a "defined" name (i.e,
- different from NAME only in having a '!D_' or a '!T_' instead of
- a '!d_' or '!t_' prefix) in the identifier hash tables. If so, say
- that this identifier is defined. */
- else if (name[1] == 'd' || name[1] == 't')
- {
- char *new_name;
- new_name = (char *)alloca (strlen (name) + 1);
- strcpy (new_name, name);
- new_name[1] = (name[1] == 'd') ? 'D' : 'T';
- if (maybe_get_identifier (new_name) != NULL)
- return (name[1] == 'd') ? MACHOPIC_DEFINED_DATA
- : MACHOPIC_DEFINED_FUNCTION;
- }
+ /* If we aren't generating fix-and-continue code, don't do anything special. */
+ if (TARGET_FIX_AND_CONTINUE == 0)
+ return 0;
- for (temp = machopic_defined_list; temp != NULL_TREE; temp = TREE_CHAIN (temp))
- {
- if (ident == TREE_VALUE (temp))
- {
- if (name[1] == 'T')
- return MACHOPIC_DEFINED_FUNCTION;
- else
- return MACHOPIC_DEFINED_DATA;
- }
- }
+ /* Otherwise, all symbol except symbols that begin with L or _OBJC_
+ are indirected. Symbols that begin with L and _OBJC_ are always
+ bound to the current translation unit as they are used for
+ generated local data of the translation unit. */
- if (name[1] == 't' || name[1] == 'T')
- {
- if (lprefix)
- return MACHOPIC_DEFINED_FUNCTION;
- else
- return MACHOPIC_UNDEFINED_FUNCTION;
- }
- else
- {
- if (lprefix)
- return MACHOPIC_DEFINED_DATA;
- else
- return MACHOPIC_UNDEFINED_DATA;
- }
-}
+ name = XSTR (sym_ref, 0);
+ lprefix = (((name[0] == '*' || name[0] == '&')
+ && (name[1] == 'L' || (name[1] == '"' && name[2] == 'L')))
+ || (strncmp (name, "_OBJC_", 6) == 0));
-enum machopic_addr_class
-machopic_classify_name (const char *name)
-{
- return machopic_classify_ident (get_identifier (name));
+ return ! lprefix;
}
-int
-machopic_ident_defined_p (tree ident)
-{
- switch (machopic_classify_ident (ident))
- {
- case MACHOPIC_UNDEFINED:
- case MACHOPIC_UNDEFINED_DATA:
- case MACHOPIC_UNDEFINED_FUNCTION:
- return 0;
- default:
- return 1;
- }
-}
static int
-machopic_data_defined_p (const char *name)
+machopic_data_defined_p (rtx sym_ref)
{
- switch (machopic_classify_ident (get_identifier (name)))
+ if (indirect_data (sym_ref))
+ return 0;
+
+ switch (machopic_classify_symbol (sym_ref))
{
case MACHOPIC_DEFINED_DATA:
+ case MACHOPIC_DEFINED_FUNCTION:
return 1;
default:
return 0;
}
}
-int
-machopic_name_defined_p (const char *name)
-{
- return machopic_ident_defined_p (get_identifier (name));
-}
-
void
-machopic_define_ident (tree ident)
+machopic_define_symbol (rtx mem)
{
- if (!machopic_ident_defined_p (ident))
- machopic_defined_list =
- tree_cons (NULL_TREE, ident, machopic_defined_list);
-}
+ rtx sym_ref;
-void
-machopic_define_name (const char *name)
-{
- machopic_define_ident (get_identifier (name));
+ gcc_assert (GET_CODE (mem) == MEM);
+ sym_ref = XEXP (mem, 0);
+ SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
}
static GTY(()) char * function_base;
const char *
machopic_function_base_name (void)
{
- const char *current_name;
/* if dynamic-no-pic is on, we should not get here */
- if (MACHO_DYNAMIC_NO_PIC_P)
- abort ();
- current_name =
- IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl));
+ gcc_assert (!MACHO_DYNAMIC_NO_PIC_P);
if (function_base == NULL)
function_base =
return function_base;
}
+/* Return a SYMBOL_REF for the PIC function base. */
+
+rtx
+machopic_function_base_sym (void)
+{
+ rtx sym_ref;
+
+ sym_ref = gen_rtx_SYMBOL_REF (Pmode, machopic_function_base_name ());
+ SYMBOL_REF_FLAGS (sym_ref)
+ |= (MACHO_SYMBOL_FLAG_VARIABLE | MACHO_SYMBOL_FLAG_DEFINED);
+ return sym_ref;
+}
+
+/* Return either ORIG or (const:P (minus:P ORIG PIC_BASE)), depending
+ on whether pic_base is NULL or not. */
+static inline rtx
+gen_pic_offset (rtx orig, rtx pic_base)
+{
+ if (!pic_base)
+ return orig;
+ else
+ return gen_rtx_CONST (Pmode, gen_rtx_MINUS (Pmode, orig, pic_base));
+}
+
static GTY(()) const char * function_base_func_name;
static GTY(()) int current_pic_label_num;
const char *current_name;
/* If dynamic-no-pic is on, we should not get here. */
- if (MACHO_DYNAMIC_NO_PIC_P)
- abort ();
+ gcc_assert (!MACHO_DYNAMIC_NO_PIC_P);
current_name =
IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl));
if (function_base_func_name != current_name)
fprintf (file, "\"L%011d$pb\"", current_pic_label_num);
}
-static GTY(()) tree machopic_non_lazy_pointers;
+/* The suffix attached to non-lazy pointer symbols. */
+#define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr"
+/* The suffix attached to stub symbols. */
+#define STUB_SUFFIX "$stub"
+
+typedef struct machopic_indirection GTY (())
+{
+ /* The SYMBOL_REF for the entity referenced. */
+ rtx symbol;
+ /* The name of the stub or non-lazy pointer. */
+ const char * ptr_name;
+ /* True iff this entry is for a stub (as opposed to a non-lazy
+ pointer). */
+ bool stub_p;
+ /* True iff this stub or pointer pointer has been referenced. */
+ bool used;
+} machopic_indirection;
+
+/* A table mapping stub names and non-lazy pointer names to
+ SYMBOL_REFs for the stubbed-to and pointed-to entities. */
+
+static GTY ((param_is (struct machopic_indirection))) htab_t
+ machopic_indirections;
+
+/* Return a hash value for a SLOT in the indirections hash table. */
+
+static hashval_t
+machopic_indirection_hash (const void *slot)
+{
+ const machopic_indirection *p = (const machopic_indirection *) slot;
+ return htab_hash_string (p->ptr_name);
+}
-/* Return a non-lazy pointer name corresponding to the given name,
- either by finding it in our list of pointer names, or by generating
- a new one. */
+/* Returns true if the KEY is the same as that associated with
+ SLOT. */
-static const char *
-machopic_non_lazy_ptr_name (const char *name)
+static int
+machopic_indirection_eq (const void *slot, const void *key)
{
- const char *temp_name;
- tree temp, ident = get_identifier (name);
+ return strcmp (((const machopic_indirection *) slot)->ptr_name, key) == 0;
+}
+
+/* Return the name of the non-lazy pointer (if STUB_P is false) or
+ stub (if STUB_B is true) corresponding to the given name. */
- for (temp = machopic_non_lazy_pointers;
- temp != NULL_TREE;
- temp = TREE_CHAIN (temp))
+const char *
+machopic_indirection_name (rtx sym_ref, bool stub_p)
+{
+ char *buffer;
+ const char *name = XSTR (sym_ref, 0);
+ size_t namelen = strlen (name);
+ machopic_indirection *p;
+ void ** slot;
+ bool saw_star = false;
+ bool needs_quotes;
+ const char *suffix;
+ const char *prefix = user_label_prefix;
+ const char *quote = "";
+ tree id;
+
+ id = maybe_get_identifier (name);
+ if (id)
{
- if (ident == TREE_VALUE (temp))
- return IDENTIFIER_POINTER (TREE_PURPOSE (temp));
+ tree id_orig = id;
+
+ while (IDENTIFIER_TRANSPARENT_ALIAS (id))
+ id = TREE_CHAIN (id);
+ if (id != id_orig)
+ {
+ name = IDENTIFIER_POINTER (id);
+ namelen = strlen (name);
+ }
}
- name = darwin_strip_name_encoding (name);
+ if (name[0] == '*')
+ {
+ saw_star = true;
+ prefix = "";
+ ++name;
+ --namelen;
+ }
- /* Try again, but comparing names this time. */
- for (temp = machopic_non_lazy_pointers;
- temp != NULL_TREE;
- temp = TREE_CHAIN (temp))
+ needs_quotes = name_needs_quotes (name);
+ if (needs_quotes)
{
- if (TREE_VALUE (temp))
- {
- temp_name = IDENTIFIER_POINTER (TREE_VALUE (temp));
- temp_name = darwin_strip_name_encoding (temp_name);
- if (strcmp (name, temp_name) == 0)
- return IDENTIFIER_POINTER (TREE_PURPOSE (temp));
- }
+ quote = "\"";
+ }
+
+ if (stub_p)
+ suffix = STUB_SUFFIX;
+ else
+ suffix = NON_LAZY_POINTER_SUFFIX;
+
+ buffer = alloca (strlen ("&L")
+ + strlen (prefix)
+ + namelen
+ + strlen (suffix)
+ + 2 * strlen (quote)
+ + 1 /* '\0' */);
+
+ /* Construct the name of the non-lazy pointer or stub. */
+ sprintf (buffer, "&%sL%s%s%s%s", quote, prefix, name, suffix, quote);
+
+ if (!machopic_indirections)
+ machopic_indirections = htab_create_ggc (37,
+ machopic_indirection_hash,
+ machopic_indirection_eq,
+ /*htab_del=*/NULL);
+
+ slot = htab_find_slot_with_hash (machopic_indirections, buffer,
+ htab_hash_string (buffer), INSERT);
+ if (*slot)
+ {
+ p = (machopic_indirection *) *slot;
+ }
+ else
+ {
+ p = (machopic_indirection *) ggc_alloc (sizeof (machopic_indirection));
+ p->symbol = sym_ref;
+ p->ptr_name = xstrdup (buffer);
+ p->stub_p = stub_p;
+ p->used = false;
+ *slot = p;
}
- {
- char *buffer;
- int namelen = strlen (name);
- int bufferlen = 0;
- tree ptr_name;
-
- buffer = alloca (namelen + strlen("$non_lazy_ptr") + 5);
-
- strcpy (buffer, "&L");
- bufferlen = 2;
- if (name[0] == '*')
- {
- memcpy (buffer + bufferlen, name+1, namelen-1+1);
- bufferlen += namelen-1;
- }
- else
- {
- buffer[bufferlen] = '_';
- memcpy (buffer + bufferlen +1, name, namelen+1);
- bufferlen += namelen +1;
- }
-
- memcpy (buffer + bufferlen, "$non_lazy_ptr", strlen("$non_lazy_ptr")+1);
- bufferlen += strlen("$non_lazy_ptr");
- ptr_name = get_identifier (buffer);
-
- machopic_non_lazy_pointers
- = tree_cons (ptr_name, ident, machopic_non_lazy_pointers);
-
- TREE_USED (machopic_non_lazy_pointers) = 0;
-
- return IDENTIFIER_POINTER (ptr_name);
- }
+ return p->ptr_name;
}
-static GTY(()) tree machopic_stubs;
+/* Return the name of the stub for the mcount function. */
-/* Return the name of the stub corresponding to the given name,
- generating a new stub name if necessary. */
+const char*
+machopic_mcount_stub_name (void)
+{
+ rtx symbol = gen_rtx_SYMBOL_REF (Pmode, "*mcount");
+ return machopic_indirection_name (symbol, /*stub_p=*/true);
+}
-const char *
-machopic_stub_name (const char *name)
+/* If NAME is the name of a stub or a non-lazy pointer , mark the stub
+ or non-lazy pointer as used -- and mark the object to which the
+ pointer/stub refers as used as well, since the pointer/stub will
+ emit a reference to it. */
+
+void
+machopic_validate_stub_or_non_lazy_ptr (const char *name)
{
- tree temp, ident = get_identifier (name);
- const char *tname;
+ machopic_indirection *p;
- for (temp = machopic_stubs;
- temp != NULL_TREE;
- temp = TREE_CHAIN (temp))
+ p = ((machopic_indirection *)
+ (htab_find_with_hash (machopic_indirections, name,
+ htab_hash_string (name))));
+ if (p && ! p->used)
{
- if (ident == TREE_VALUE (temp))
- return IDENTIFIER_POINTER (TREE_PURPOSE (temp));
- tname = IDENTIFIER_POINTER (TREE_VALUE (temp));
- if (strcmp (name, tname) == 0)
- return IDENTIFIER_POINTER (TREE_PURPOSE (temp));
- /* A library call name might not be section-encoded yet, so try
- it against a stripped name. */
- if (name[0] != '!'
- && tname[0] == '!'
- && strcmp (name, tname + 4) == 0)
- return IDENTIFIER_POINTER (TREE_PURPOSE (temp));
- }
+ const char *real_name;
+ tree id;
- name = darwin_strip_name_encoding (name);
-
- {
- char *buffer;
- int bufferlen = 0;
- int namelen = strlen (name);
- tree ptr_name;
- int needs_quotes = name_needs_quotes (name);
-
- buffer = alloca (namelen + 20);
-
- if (needs_quotes)
- {
- strcpy (buffer, "&\"L");
- bufferlen = strlen("&\"L");
- }
- else
- {
- strcpy (buffer, "&L");
- bufferlen = strlen("&L");
- }
-
- if (name[0] == '*')
- {
- memcpy (buffer + bufferlen, name+1, namelen - 1 +1);
- bufferlen += namelen - 1;
- }
- else
- {
- buffer[bufferlen] = '_';
- memcpy (buffer + bufferlen +1, name, namelen+1);
- bufferlen += namelen +1;
- }
-
- if (needs_quotes)
- {
- memcpy (buffer + bufferlen, "$stub\"", strlen("$stub\"")+1);
- bufferlen += strlen("$stub\"");
- }
- else
- {
- memcpy (buffer + bufferlen, "$stub", strlen("$stub")+1);
- bufferlen += strlen("$stub");
- }
- ptr_name = get_identifier (buffer);
-
- machopic_stubs = tree_cons (ptr_name, ident, machopic_stubs);
- TREE_USED (machopic_stubs) = 0;
-
- return IDENTIFIER_POINTER (ptr_name);
- }
-}
+ p->used = true;
-void
-machopic_validate_stub_or_non_lazy_ptr (const char *name, int validate_stub)
-{
- const char *real_name;
- tree temp, ident = get_identifier (name), id2;
+ /* Do what output_addr_const will do when we actually call it. */
+ if (SYMBOL_REF_DECL (p->symbol))
+ mark_decl_referenced (SYMBOL_REF_DECL (p->symbol));
- for (temp = (validate_stub ? machopic_stubs : machopic_non_lazy_pointers);
- temp != NULL_TREE;
- temp = TREE_CHAIN (temp))
- if (ident == TREE_PURPOSE (temp))
- {
- /* Mark both the stub or non-lazy pointer as well as the
- original symbol as being referenced. */
- TREE_USED (temp) = 1;
- if (TREE_CODE (TREE_VALUE (temp)) == IDENTIFIER_NODE)
- mark_referenced (TREE_VALUE (temp));
- real_name = IDENTIFIER_POINTER (TREE_VALUE (temp));
- real_name = darwin_strip_name_encoding (real_name);
- id2 = maybe_get_identifier (real_name);
- if (id2)
- mark_referenced (id2);
- }
+ real_name = targetm.strip_name_encoding (XSTR (p->symbol, 0));
+
+ id = maybe_get_identifier (real_name);
+ if (id)
+ mark_referenced (id);
+ }
}
/* Transform ORIG, which may be any data source, to the corresponding
if (GET_CODE (orig) == SYMBOL_REF)
{
- const char *name = XSTR (orig, 0);
- int defined = machopic_data_defined_p (name);
+ int defined = machopic_data_defined_p (orig);
if (defined && MACHO_DYNAMIC_NO_PIC_P)
{
#if defined (TARGET_TOC)
- emit_insn (gen_macho_high (reg, orig));
- emit_insn (gen_macho_low (reg, reg, orig));
+ /* Create a new register for CSE opportunities. */
+ rtx hi_reg = (no_new_pseudos ? reg : gen_reg_rtx (Pmode));
+ emit_insn (gen_macho_high (hi_reg, orig));
+ emit_insn (gen_macho_low (reg, hi_reg, orig));
#else
/* some other cpu -- writeme! */
- abort ();
+ gcc_unreachable ();
#endif
return reg;
}
else if (defined)
{
#if defined (TARGET_TOC) || defined (HAVE_lo_sum)
- rtx pic_base = gen_rtx_SYMBOL_REF (Pmode,
- machopic_function_base_name ());
- rtx offset = gen_rtx_CONST (Pmode,
- gen_rtx_MINUS (Pmode, orig, pic_base));
+ rtx pic_base = machopic_function_base_sym ();
+ rtx offset = gen_pic_offset (orig, pic_base);
#endif
#if defined (TARGET_TOC) /* i.e., PowerPC */
rtx hi_sum_reg = (no_new_pseudos ? reg : gen_reg_rtx (Pmode));
- if (reg == NULL)
- abort ();
+ gcc_assert (reg);
emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
gen_rtx_PLUS (Pmode, pic_offset_table_rtx,
orig = reg;
#else
#if defined (HAVE_lo_sum)
- if (reg == 0) abort ();
+ gcc_assert (reg);
emit_insn (gen_rtx_SET (VOIDmode, reg,
gen_rtx_HIGH (Pmode, offset)));
return orig;
}
- ptr_ref = gen_rtx_SYMBOL_REF (Pmode,
- machopic_non_lazy_ptr_name (name));
+ ptr_ref = (gen_rtx_SYMBOL_REF
+ (Pmode,
+ machopic_indirection_name (orig, /*stub_p=*/false)));
- ptr_ref = gen_rtx_MEM (Pmode, ptr_ref);
- RTX_UNCHANGING_P (ptr_ref) = 1;
+ SYMBOL_REF_DATA (ptr_ref) = SYMBOL_REF_DATA (orig);
+
+ ptr_ref = gen_const_mem (Pmode, ptr_ref);
+ machopic_define_symbol (ptr_ref);
return ptr_ref;
}
if (GET_CODE (target) != MEM)
return target;
- if (MACHOPIC_INDIRECT && GET_CODE (XEXP (target, 0)) == SYMBOL_REF)
+ if (MACHOPIC_INDIRECT
+ && GET_CODE (XEXP (target, 0)) == SYMBOL_REF
+ && !(SYMBOL_REF_FLAGS (XEXP (target, 0))
+ & MACHO_SYMBOL_FLAG_DEFINED))
{
- enum machine_mode mode = GET_MODE (XEXP (target, 0));
- const char *name = XSTR (XEXP (target, 0), 0);
-
- /* If the name is already defined, we need do nothing. */
- if (name[0] == '!' && name[1] == 'T')
- return target;
-
- if (!machopic_name_defined_p (name))
- {
- const char *stub_name = machopic_stub_name (name);
-
- XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name);
- RTX_UNCHANGING_P (target) = 1;
- }
+ rtx sym_ref = XEXP (target, 0);
+ const char *stub_name = machopic_indirection_name (sym_ref,
+ /*stub_p=*/true);
+ enum machine_mode mode = GET_MODE (sym_ref);
+
+ XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name);
+ SYMBOL_REF_DATA (XEXP (target, 0)) = SYMBOL_REF_DATA (sym_ref);
+ MEM_READONLY_P (target) = 1;
+ MEM_NOTRAP_P (target) = 1;
}
return target;
return reg;
}
- /* if dynamic-no-pic then use 0 as the pic base */
+ /* if dynamic-no-pic we don't have a pic base */
if (MACHO_DYNAMIC_NO_PIC_P)
- pic_base = CONST0_RTX (Pmode);
+ pic_base = NULL;
else
- pic_base = gen_rtx_SYMBOL_REF (Pmode, machopic_function_base_name ());
+ pic_base = machopic_function_base_sym ();
if (GET_CODE (orig) == MEM)
{
if (reg == 0)
{
- if (reload_in_progress)
- abort ();
- else
- reg = gen_reg_rtx (Pmode);
+ gcc_assert (!reload_in_progress);
+ reg = gen_reg_rtx (Pmode);
}
#ifdef HAVE_lo_sum
rtx mem;
emit_insn (gen_macho_high (temp_reg, asym));
- mem = gen_rtx_MEM (GET_MODE (orig),
- gen_rtx_LO_SUM (Pmode, temp_reg, asym));
- RTX_UNCHANGING_P (mem) = 1;
+ mem = gen_const_mem (GET_MODE (orig),
+ gen_rtx_LO_SUM (Pmode, temp_reg, asym));
emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
#else
/* Some other CPU -- WriteMe! but right now there are no other platform that can use dynamic-no-pic */
- abort ();
+ gcc_unreachable ();
#endif
pic_ref = reg;
}
if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
|| GET_CODE (XEXP (orig, 0)) == LABEL_REF)
{
- rtx offset = gen_rtx_CONST (Pmode,
- gen_rtx_MINUS (Pmode,
- XEXP (orig, 0),
- pic_base));
+ rtx offset = gen_pic_offset (XEXP (orig, 0), pic_base);
#if defined (TARGET_TOC) /* i.e., PowerPC */
/* Generating a new reg may expose opportunities for
common subexpression elimination. */
- rtx hi_sum_reg = no_new_pseudos ? reg : gen_reg_rtx (SImode);
+ rtx hi_sum_reg = no_new_pseudos ? reg : gen_reg_rtx (Pmode);
rtx mem;
rtx insn;
rtx sum;
-
+
sum = gen_rtx_HIGH (Pmode, offset);
if (! MACHO_DYNAMIC_NO_PIC_P)
sum = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, sum);
emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, sum));
- mem = gen_rtx_MEM (GET_MODE (orig),
- gen_rtx_LO_SUM (Pmode,
- hi_sum_reg, offset));
- RTX_UNCHANGING_P (mem) = 1;
+ mem = gen_const_mem (GET_MODE (orig),
+ gen_rtx_LO_SUM (Pmode,
+ hi_sum_reg, offset));
insn = emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
- REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EQUAL, pic_ref,
+ REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EQUAL, pic_ref,
REG_NOTES (insn));
pic_ref = reg;
#else
emit_insn (gen_rtx_USE (VOIDmode,
- gen_rtx_REG (Pmode,
+ gen_rtx_REG (Pmode,
PIC_OFFSET_TABLE_REGNUM)));
emit_insn (gen_rtx_SET (VOIDmode, reg,
gen_rtx_HIGH (Pmode,
- gen_rtx_CONST (Pmode,
+ gen_rtx_CONST (Pmode,
offset))));
emit_insn (gen_rtx_SET (VOIDmode, reg,
gen_rtx_LO_SUM (Pmode, reg,
}
#if 0
emit_insn (gen_rtx_USE (VOIDmode,
- gen_rtx_REG (Pmode,
+ gen_rtx_REG (Pmode,
PIC_OFFSET_TABLE_REGNUM)));
#endif
- pic_ref = gen_rtx_PLUS (Pmode,
- pic,
- gen_rtx_CONST (Pmode,
- gen_rtx_MINUS (Pmode,
- XEXP (orig, 0),
- pic_base)));
+ if (reload_in_progress)
+ regs_ever_live[REGNO (pic)] = 1;
+ pic_ref = gen_rtx_PLUS (Pmode, pic,
+ gen_pic_offset (XEXP (orig, 0),
+ pic_base));
}
#if !defined (TARGET_TOC)
emit_move_insn (reg, pic_ref);
- pic_ref = gen_rtx_MEM (GET_MODE (orig), reg);
+ pic_ref = gen_const_mem (GET_MODE (orig), reg);
#endif
- RTX_UNCHANGING_P (pic_ref) = 1;
}
else
{
if (GET_CODE (orig) == SYMBOL_REF
|| GET_CODE (orig) == LABEL_REF)
{
- rtx offset = gen_rtx_CONST (Pmode,
- gen_rtx_MINUS (Pmode,
- orig, pic_base));
+ rtx offset = gen_pic_offset (orig, pic_base);
#if defined (TARGET_TOC) /* i.e., PowerPC */
rtx hi_sum_reg;
if (reg == 0)
{
- if (reload_in_progress)
- abort ();
- else
- reg = gen_reg_rtx (SImode);
+ gcc_assert (!reload_in_progress);
+ reg = gen_reg_rtx (Pmode);
}
hi_sum_reg = reg;
? gen_rtx_HIGH (Pmode, offset)
: gen_rtx_PLUS (Pmode,
pic_offset_table_rtx,
- gen_rtx_HIGH (Pmode,
+ gen_rtx_HIGH (Pmode,
offset))));
emit_insn (gen_rtx_SET (VOIDmode, reg,
gen_rtx_LO_SUM (Pmode,
hi_sum_reg, offset)));
pic_ref = reg;
- RTX_UNCHANGING_P (pic_ref) = 1;
#else
emit_insn (gen_rtx_SET (VOIDmode, reg,
gen_rtx_HIGH (Pmode, offset)));
gen_rtx_LO_SUM (Pmode, reg, offset)));
pic_ref = gen_rtx_PLUS (Pmode,
pic_offset_table_rtx, reg);
- RTX_UNCHANGING_P (pic_ref) = 1;
#endif
}
else
#endif /* HAVE_lo_sum */
{
- if (GET_CODE (orig) == REG)
+ if (REG_P (orig)
+ || GET_CODE (orig) == SUBREG)
{
return orig;
}
emit_insn (gen_rtx_USE (VOIDmode,
pic_offset_table_rtx));
#endif
+ if (reload_in_progress)
+ regs_ever_live[REGNO (pic)] = 1;
pic_ref = gen_rtx_PLUS (Pmode,
pic,
- gen_rtx_CONST (Pmode,
- gen_rtx_MINUS (Pmode,
- orig, pic_base)));
+ gen_pic_offset (orig, pic_base));
}
}
}
else
pic_ref = gen_rtx_PLUS (Pmode, base, orig);
- if (RTX_UNCHANGING_P (base) && RTX_UNCHANGING_P (orig))
- RTX_UNCHANGING_P (pic_ref) = 1;
-
if (reg && is_complex)
{
emit_move_insn (reg, pic_ref);
&& GET_CODE (XEXP (orig, 0)) == SYMBOL_REF)
{
rtx addr = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
-
- addr = gen_rtx_MEM (GET_MODE (orig), addr);
- RTX_UNCHANGING_P (addr) = RTX_UNCHANGING_P (orig);
+ addr = replace_equiv_address (orig, addr);
emit_move_insn (reg, addr);
pic_ref = reg;
}
return pic_ref;
}
+/* Output the stub or non-lazy pointer in *SLOT, if it has been used.
+ DATA is the FILE* for assembly output. Called from
+ htab_traverse. */
-void
-machopic_finish (FILE *asm_out_file)
+static int
+machopic_output_indirection (void **slot, void *data)
{
- tree temp;
+ machopic_indirection *p = *((machopic_indirection **) slot);
+ FILE *asm_out_file = (FILE *) data;
+ rtx symbol;
+ const char *sym_name;
+ const char *ptr_name;
+
+ if (!p->used)
+ return 1;
- for (temp = machopic_stubs;
- temp != NULL_TREE;
- temp = TREE_CHAIN (temp))
+ symbol = p->symbol;
+ sym_name = XSTR (symbol, 0);
+ ptr_name = p->ptr_name;
+
+ if (p->stub_p)
{
- const char *sym_name = IDENTIFIER_POINTER (TREE_VALUE (temp));
- const char *stub_name = IDENTIFIER_POINTER (TREE_PURPOSE (temp));
char *sym;
char *stub;
+ tree id;
- if (! TREE_USED (temp))
- continue;
-
- /* If the symbol is actually defined, we don't need a stub. */
- if (sym_name[0] == '!' && sym_name[1] == 'T')
- continue;
+ id = maybe_get_identifier (sym_name);
+ if (id)
+ {
+ tree id_orig = id;
- sym_name = darwin_strip_name_encoding (sym_name);
+ while (IDENTIFIER_TRANSPARENT_ALIAS (id))
+ id = TREE_CHAIN (id);
+ if (id != id_orig)
+ sym_name = IDENTIFIER_POINTER (id);
+ }
sym = alloca (strlen (sym_name) + 2);
if (sym_name[0] == '*' || sym_name[0] == '&')
else if (sym_name[0] == '-' || sym_name[0] == '+')
strcpy (sym, sym_name);
else
- sym[0] = '_', strcpy (sym + 1, sym_name);
+ sprintf (sym, "%s%s", user_label_prefix, sym_name);
- stub = alloca (strlen (stub_name) + 2);
- if (stub_name[0] == '*' || stub_name[0] == '&')
- strcpy (stub, stub_name + 1);
+ stub = alloca (strlen (ptr_name) + 2);
+ if (ptr_name[0] == '*' || ptr_name[0] == '&')
+ strcpy (stub, ptr_name + 1);
else
- stub[0] = '_', strcpy (stub + 1, stub_name);
+ sprintf (stub, "%s%s", user_label_prefix, ptr_name);
machopic_output_stub (asm_out_file, sym, stub);
}
-
- for (temp = machopic_non_lazy_pointers;
- temp != NULL_TREE;
- temp = TREE_CHAIN (temp))
+ else if (! indirect_data (symbol)
+ && (machopic_symbol_defined_p (symbol)
+ || SYMBOL_REF_LOCAL_P (symbol)))
{
- const char *const sym_name = IDENTIFIER_POINTER (TREE_VALUE (temp));
- const char *const lazy_name = IDENTIFIER_POINTER (TREE_PURPOSE (temp));
+ switch_to_section (data_section);
+ assemble_align (GET_MODE_ALIGNMENT (Pmode));
+ assemble_label (ptr_name);
+ assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name),
+ GET_MODE_SIZE (Pmode),
+ GET_MODE_ALIGNMENT (Pmode), 1);
+ }
+ else
+ {
+ rtx init = const0_rtx;
- if (! TREE_USED (temp))
- continue;
+ switch_to_section (darwin_sections[machopic_nl_symbol_ptr_section]);
+ assemble_name (asm_out_file, ptr_name);
+ fprintf (asm_out_file, ":\n");
- if (machopic_ident_defined_p (TREE_VALUE (temp)))
- {
- data_section ();
- assemble_align (GET_MODE_ALIGNMENT (Pmode));
- assemble_label (lazy_name);
- assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name),
- GET_MODE_SIZE (Pmode),
- GET_MODE_ALIGNMENT (Pmode), 1);
- }
- else
- {
- machopic_nl_symbol_ptr_section ();
- assemble_name (asm_out_file, lazy_name);
- fprintf (asm_out_file, ":\n");
+ fprintf (asm_out_file, "\t.indirect_symbol ");
+ assemble_name (asm_out_file, sym_name);
+ fprintf (asm_out_file, "\n");
- fprintf (asm_out_file, "\t.indirect_symbol ");
- assemble_name (asm_out_file, sym_name);
- fprintf (asm_out_file, "\n");
+ /* Variables that are marked with MACHO_SYMBOL_STATIC need to
+ have their symbol name instead of 0 in the second entry of
+ the non-lazy symbol pointer data structure when they are
+ defined. This allows the runtime to rebind newer instances
+ of the translation unit with the original instance of the
+ symbol. */
- assemble_integer (const0_rtx, GET_MODE_SIZE (Pmode),
- GET_MODE_ALIGNMENT (Pmode), 1);
- }
+ if ((SYMBOL_REF_FLAGS (symbol) & MACHO_SYMBOL_STATIC)
+ && machopic_symbol_defined_p (symbol))
+ init = gen_rtx_SYMBOL_REF (Pmode, sym_name);
+
+ assemble_integer (init, GET_MODE_SIZE (Pmode),
+ GET_MODE_ALIGNMENT (Pmode), 1);
}
+
+ return 1;
+}
+
+void
+machopic_finish (FILE *asm_out_file)
+{
+ if (machopic_indirections)
+ htab_traverse_noresize (machopic_indirections,
+ machopic_output_indirection,
+ asm_out_file);
}
int
op = XEXP (op, 0);
if (GET_CODE (op) == SYMBOL_REF)
- return machopic_name_defined_p (XSTR (op, 0));
+ return machopic_symbol_defined_p (op);
else
return 0;
}
if (GET_CODE (op) == MINUS
&& GET_CODE (XEXP (op, 0)) == SYMBOL_REF
&& GET_CODE (XEXP (op, 1)) == SYMBOL_REF
- && machopic_name_defined_p (XSTR (XEXP (op, 0), 0))
- && machopic_name_defined_p (XSTR (XEXP (op, 1), 0)))
+ && machopic_symbol_defined_p (XEXP (op, 0))
+ && machopic_symbol_defined_p (XEXP (op, 1)))
return 1;
return 0;
void
darwin_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
{
- char code = '\0';
- int defined = 0;
rtx sym_ref;
- const char *orig_str;
- char *new_str;
- size_t len, new_len;
/* Do the standard encoding things first. */
default_encode_section_info (decl, rtl, first);
- /* With the introduction of symbol_ref flags, some of the following
- code has become redundant and should be removed at some point. */
-
- if ((TREE_CODE (decl) == FUNCTION_DECL
- || TREE_CODE (decl) == VAR_DECL)
- && !DECL_EXTERNAL (decl)
- && ((TREE_STATIC (decl)
- && (!DECL_COMMON (decl) || !TREE_PUBLIC (decl)))
- || (DECL_INITIAL (decl)
- && DECL_INITIAL (decl) != error_mark_node)))
- defined = 1;
-
- if (TREE_CODE (decl) == FUNCTION_DECL)
- code = (defined ? 'T' : 't');
- else if (TREE_CODE (decl) == VAR_DECL)
- code = (defined ? 'D' : 'd');
-
- if (code == '\0')
+ if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
return;
sym_ref = XEXP (rtl, 0);
- orig_str = XSTR (sym_ref, 0);
- len = strlen (orig_str) + 1;
-
- if (orig_str[0] == '!')
- {
- /* Already encoded; see if we need to change it. */
- if (code == orig_str[1])
- return;
- /* Yes, tweak a copy of the name and put it in a new string. */
- new_str = alloca (len);
- memcpy (new_str, orig_str, len);
- new_str[1] = code;
- XSTR (sym_ref, 0) = ggc_alloc_string (new_str, len);
- }
- else
- {
- /* Add the encoding. */
- new_len = len + 4;
- new_str = alloca (new_len);
- new_str[0] = '!';
- new_str[1] = code;
- new_str[2] = '_';
- new_str[3] = '_';
- memcpy (new_str + 4, orig_str, len);
- XSTR (sym_ref, 0) = ggc_alloc_string (new_str, new_len);
- }
- /* The non-lazy pointer list may have captured references to the
- old encoded name, change them. */
if (TREE_CODE (decl) == VAR_DECL)
- update_non_lazy_ptrs (XSTR (sym_ref, 0));
- else
- update_stubs (XSTR (sym_ref, 0));
-}
+ SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE;
-/* Undo the effects of the above. */
-
-const char *
-darwin_strip_name_encoding (const char *str)
-{
- return str[0] == '!' ? str + 4 : str;
-}
-
-/* Scan the list of non-lazy pointers and update any recorded names whose
- stripped name matches the argument. */
-
-static void
-update_non_lazy_ptrs (const char *name)
-{
- const char *name1, *name2;
- tree temp;
-
- name1 = darwin_strip_name_encoding (name);
-
- for (temp = machopic_non_lazy_pointers;
- temp != NULL_TREE;
- temp = TREE_CHAIN (temp))
- {
- const char *sym_name = IDENTIFIER_POINTER (TREE_VALUE (temp));
+ if (!DECL_EXTERNAL (decl)
+ && (!TREE_PUBLIC (decl) || !DECL_WEAK (decl))
+ && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (decl))
+ && ((TREE_STATIC (decl)
+ && (!DECL_COMMON (decl) || !TREE_PUBLIC (decl)))
+ || (!DECL_COMMON (decl) && DECL_INITIAL (decl)
+ && DECL_INITIAL (decl) != error_mark_node)))
+ SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
- if (*sym_name == '!')
- {
- name2 = darwin_strip_name_encoding (sym_name);
- if (strcmp (name1, name2) == 0)
- {
- /* FIXME: This breaks the identifier hash table. */
- IDENTIFIER_NODE_CHECK (TREE_VALUE (temp))->identifier.id.str
- = (unsigned char *) name;
- break;
- }
- }
- }
+ if (! TREE_PUBLIC (decl))
+ SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_STATIC;
}
-/* Function NAME is being defined, and its label has just been output.
- If there's already a reference to a stub for this function, we can
- just emit the stub label now and we don't bother emitting the stub later. */
-
void
-machopic_output_possible_stub_label (FILE *file, const char *name)
+darwin_mark_decl_preserved (const char *name)
{
- tree temp;
-
- /* Ensure we're looking at a section-encoded name. */
- if (name[0] != '!' || (name[1] != 't' && name[1] != 'T'))
- return;
-
- for (temp = machopic_stubs;
- temp != NULL_TREE;
- temp = TREE_CHAIN (temp))
- {
- const char *sym_name;
-
- sym_name = IDENTIFIER_POINTER (TREE_VALUE (temp));
- if (sym_name[0] == '!' && (sym_name[1] == 'T' || sym_name[1] == 't')
- && ! strcmp (name+2, sym_name+2))
- {
- ASM_OUTPUT_LABEL (file, IDENTIFIER_POINTER (TREE_PURPOSE (temp)));
- /* Avoid generating a stub for this. */
- TREE_USED (temp) = 0;
- break;
- }
- }
-}
-
-/* Scan the list of stubs and update any recorded names whose
- stripped name matches the argument. */
-
-static void
-update_stubs (const char *name)
-{
- const char *name1, *name2;
- tree temp;
-
- name1 = darwin_strip_name_encoding (name);
-
- for (temp = machopic_stubs;
- temp != NULL_TREE;
- temp = TREE_CHAIN (temp))
- {
- const char *sym_name = IDENTIFIER_POINTER (TREE_VALUE (temp));
-
- if (*sym_name == '!')
- {
- name2 = darwin_strip_name_encoding (sym_name);
- if (strcmp (name1, name2) == 0)
- {
- /* FIXME: This breaks the identifier hash table. */
- IDENTIFIER_NODE_CHECK (TREE_VALUE (temp))->identifier.id.str
- = (unsigned char *) name;
- break;
- }
- }
- }
+ fprintf (asm_out_file, ".no_dead_strip ");
+ assemble_name (asm_out_file, name);
+ fputc ('\n', asm_out_file);
}
-void
+section *
machopic_select_section (tree exp, int reloc,
unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
{
- void (*base_function)(void);
+ section *base_section;
+ bool weak_p = (DECL_P (exp) && DECL_WEAK (exp)
+ && (lookup_attribute ("weak", DECL_ATTRIBUTES (exp))
+ || ! lookup_attribute ("weak_import",
+ DECL_ATTRIBUTES (exp))));
- if (decl_readonly_section_1 (exp, reloc, MACHOPIC_INDIRECT))
- base_function = readonly_data_section;
+ if (TREE_CODE (exp) == FUNCTION_DECL)
+ {
+ if (reloc == 1)
+ base_section = (weak_p
+ ? darwin_sections[text_unlikely_coal_section]
+ : unlikely_text_section ());
+ else
+ base_section = weak_p ? darwin_sections[text_coal_section] : text_section;
+ }
+ else if (decl_readonly_section_1 (exp, reloc, MACHOPIC_INDIRECT))
+ base_section = weak_p ? darwin_sections[const_coal_section] : darwin_sections[const_section];
else if (TREE_READONLY (exp) || TREE_CONSTANT (exp))
- base_function = const_data_section;
+ base_section = weak_p ? darwin_sections[const_data_coal_section] : darwin_sections[const_data_section];
else
- base_function = data_section;
+ base_section = weak_p ? darwin_sections[data_coal_section] : data_section;
if (TREE_CODE (exp) == STRING_CST
&& ((size_t) TREE_STRING_LENGTH (exp)
- == strlen (TREE_STRING_POINTER (exp)) + 1)
- && ! flag_writable_strings)
- cstring_section ();
+ == strlen (TREE_STRING_POINTER (exp)) + 1))
+ return darwin_sections[cstring_section];
else if ((TREE_CODE (exp) == INTEGER_CST || TREE_CODE (exp) == REAL_CST)
&& flag_merge_constants)
{
- tree size = TYPE_SIZE (TREE_TYPE (exp));
+ tree size = TYPE_SIZE_UNIT (TREE_TYPE (exp));
if (TREE_CODE (size) == INTEGER_CST &&
TREE_INT_CST_LOW (size) == 4 &&
TREE_INT_CST_HIGH (size) == 0)
- literal4_section ();
+ return darwin_sections[literal4_section];
else if (TREE_CODE (size) == INTEGER_CST &&
TREE_INT_CST_LOW (size) == 8 &&
TREE_INT_CST_HIGH (size) == 0)
- literal8_section ();
+ return darwin_sections[literal8_section];
else
- base_function ();
+ return base_section;
}
else if (TREE_CODE (exp) == CONSTRUCTOR
&& TREE_TYPE (exp)
tree name = TYPE_NAME (TREE_TYPE (exp));
if (TREE_CODE (name) == TYPE_DECL)
name = DECL_NAME (name);
- if (!strcmp (IDENTIFIER_POINTER (name), "NSConstantString"))
- objc_constant_string_object_section ();
- else if (!strcmp (IDENTIFIER_POINTER (name), "NXConstantString"))
- objc_string_object_section ();
+
+ if (!strcmp (IDENTIFIER_POINTER (name), "__builtin_ObjCString"))
+ {
+ if (flag_next_runtime)
+ return darwin_sections[objc_constant_string_object_section];
+ else
+ return darwin_sections[objc_string_object_section];
+ }
else
- base_function ();
+ return base_section;
}
else if (TREE_CODE (exp) == VAR_DECL &&
DECL_NAME (exp) &&
const char *name = IDENTIFIER_POINTER (DECL_NAME (exp));
if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20))
- objc_cls_meth_section ();
+ return darwin_sections[objc_cls_meth_section];
else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23))
- objc_inst_meth_section ();
+ return darwin_sections[objc_inst_meth_section];
else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 20))
- objc_cat_cls_meth_section ();
+ return darwin_sections[objc_cat_cls_meth_section];
else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 23))
- objc_cat_inst_meth_section ();
+ return darwin_sections[objc_cat_inst_meth_section];
else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22))
- objc_class_vars_section ();
+ return darwin_sections[objc_class_vars_section];
else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25))
- objc_instance_vars_section ();
+ return darwin_sections[objc_instance_vars_section];
else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22))
- objc_cat_cls_meth_section ();
+ return darwin_sections[objc_cat_cls_meth_section];
else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17))
- objc_class_names_section ();
+ return darwin_sections[objc_class_names_section];
else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20))
- objc_meth_var_names_section ();
+ return darwin_sections[objc_meth_var_names_section];
else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20))
- objc_meth_var_types_section ();
+ return darwin_sections[objc_meth_var_types_section];
else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22))
- objc_cls_refs_section ();
+ return darwin_sections[objc_cls_refs_section];
else if (!strncmp (name, "_OBJC_CLASS_", 12))
- objc_class_section ();
+ return darwin_sections[objc_class_section];
else if (!strncmp (name, "_OBJC_METACLASS_", 16))
- objc_meta_class_section ();
+ return darwin_sections[objc_meta_class_section];
else if (!strncmp (name, "_OBJC_CATEGORY_", 15))
- objc_category_section ();
+ return darwin_sections[objc_category_section];
else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25))
- objc_selector_refs_section ();
+ return darwin_sections[objc_selector_refs_section];
else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20))
- objc_selector_fixup_section ();
+ return darwin_sections[objc_selector_fixup_section];
else if (!strncmp (name, "_OBJC_SYMBOLS", 13))
- objc_symbols_section ();
+ return darwin_sections[objc_symbols_section];
else if (!strncmp (name, "_OBJC_MODULES", 13))
- objc_module_info_section ();
+ return darwin_sections[objc_module_info_section];
else if (!strncmp (name, "_OBJC_IMAGE_INFO", 16))
- objc_image_info_section ();
+ return darwin_sections[objc_image_info_section];
else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32))
- objc_cat_inst_meth_section ();
+ return darwin_sections[objc_cat_inst_meth_section];
else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29))
- objc_cat_cls_meth_section ();
+ return darwin_sections[objc_cat_cls_meth_section];
else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20))
- objc_cat_cls_meth_section ();
+ return darwin_sections[objc_cat_cls_meth_section];
else if (!strncmp (name, "_OBJC_PROTOCOL_", 15))
- objc_protocol_section ();
+ return darwin_sections[objc_protocol_section];
else
- base_function ();
+ return base_section;
}
else
- base_function ();
+ return base_section;
}
/* This can be called with address expressions as "rtx".
They must go in "const". */
-void
+section *
machopic_select_rtx_section (enum machine_mode mode, rtx x,
unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
{
- if (GET_MODE_SIZE (mode) == 8)
- literal8_section ();
+ if (GET_MODE_SIZE (mode) == 8
+ && (GET_CODE (x) == CONST_INT
+ || GET_CODE (x) == CONST_DOUBLE))
+ return darwin_sections[literal8_section];
else if (GET_MODE_SIZE (mode) == 4
&& (GET_CODE (x) == CONST_INT
|| GET_CODE (x) == CONST_DOUBLE))
- literal4_section ();
+ return darwin_sections[literal4_section];
else if (MACHOPIC_INDIRECT
&& (GET_CODE (x) == SYMBOL_REF
|| GET_CODE (x) == CONST
|| GET_CODE (x) == LABEL_REF))
- const_data_section ();
+ return darwin_sections[const_data_section];
else
- const_section ();
+ return darwin_sections[const_section];
}
void
machopic_asm_out_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
{
if (MACHOPIC_INDIRECT)
- mod_init_section ();
+ switch_to_section (darwin_sections[mod_init_section]);
else
- constructor_section ();
+ switch_to_section (darwin_sections[constructor_section]);
assemble_align (POINTER_SIZE);
assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
machopic_asm_out_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
{
if (MACHOPIC_INDIRECT)
- mod_term_section ();
+ switch_to_section (darwin_sections[mod_term_section]);
else
- destructor_section ();
+ switch_to_section (darwin_sections[destructor_section]);
assemble_align (POINTER_SIZE);
assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
default_globalize_label (stream, name);
}
+void
+darwin_asm_named_section (const char *name,
+ unsigned int flags ATTRIBUTE_UNUSED,
+ tree decl ATTRIBUTE_UNUSED)
+{
+ fprintf (asm_out_file, "\t.section %s\n", name);
+}
+
+void
+darwin_unique_section (tree decl ATTRIBUTE_UNUSED, int reloc ATTRIBUTE_UNUSED)
+{
+ /* Darwin does not use unique sections. */
+}
+
+/* Handle a "weak_import" attribute; arguments as in
+ struct attribute_spec.handler. */
+
+tree
+darwin_handle_weak_import_attribute (tree *node, tree name,
+ tree ARG_UNUSED (args),
+ int ARG_UNUSED (flags),
+ bool * no_add_attrs)
+{
+ if (TREE_CODE (*node) != FUNCTION_DECL && TREE_CODE (*node) != VAR_DECL)
+ {
+ warning (OPT_Wattributes, "%qs attribute ignored",
+ IDENTIFIER_POINTER (name));
+ *no_add_attrs = true;
+ }
+ else
+ declare_weak (*node);
+
+ return NULL_TREE;
+}
+
+static void
+no_dead_strip (FILE *file, const char *lab)
+{
+ fprintf (file, ".no_dead_strip %s\n", lab);
+}
+
+/* Emit a label for an FDE, making it global and/or weak if appropriate.
+ The third parameter is nonzero if this is for exception handling.
+ The fourth parameter is nonzero if this is just a placeholder for an
+ FDE that we are omitting. */
+
+void
+darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty)
+{
+ tree id = DECL_ASSEMBLER_NAME (decl)
+ ? DECL_ASSEMBLER_NAME (decl)
+ : DECL_NAME (decl);
+
+ const char *base = IDENTIFIER_POINTER (id);
+
+ bool need_quotes = name_needs_quotes (base);
+ char *lab;
+
+ if (! for_eh)
+ return;
+
+ lab = concat (need_quotes ? "\"" : "", user_label_prefix, base, ".eh",
+ need_quotes ? "\"" : "", NULL);
+
+ if (TREE_PUBLIC (decl))
+ fprintf (file, "\t%s %s\n",
+ (DECL_VISIBILITY (decl) != VISIBILITY_HIDDEN
+ ? ".globl"
+ : ".private_extern"),
+ lab);
+
+ if (DECL_WEAK (decl))
+ fprintf (file, "\t.weak_definition %s\n", lab);
+
+ if (empty)
+ {
+ fprintf (file, "%s = 0\n", lab);
+
+ /* Mark the absolute .eh and .eh1 style labels as needed to
+ ensure that we don't dead code strip them and keep such
+ labels from another instantiation point until we can fix this
+ properly with group comdat support. */
+ no_dead_strip (file, lab);
+ }
+ else
+ fprintf (file, "%s:\n", lab);
+
+ free (lab);
+}
+
+static GTY(()) unsigned long except_table_label_num;
+
+void
+darwin_emit_except_table_label (FILE *file)
+{
+ char section_start_label[30];
+
+ ASM_GENERATE_INTERNAL_LABEL (section_start_label, "GCC_except_table",
+ except_table_label_num++);
+ ASM_OUTPUT_LABEL (file, section_start_label);
+}
+/* Generate a PC-relative reference to a Mach-O non-lazy-symbol. */
+
+void
+darwin_non_lazy_pcrel (FILE *file, rtx addr)
+{
+ const char *nlp_name;
+
+ gcc_assert (GET_CODE (addr) == SYMBOL_REF);
+
+ nlp_name = machopic_indirection_name (addr, /*stub_p=*/false);
+ fputs ("\t.long\t", file);
+ ASM_OUTPUT_LABELREF (file, nlp_name);
+ fputs ("-.", file);
+}
+
/* Emit an assembler directive to set visibility for a symbol. The
only supported visibilities are VISIBILITY_DEFAULT and
VISIBILITY_HIDDEN; the latter corresponds to Darwin's "private
extern". There is no MACH-O equivalent of ELF's
VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */
-void
+void
darwin_assemble_visibility (tree decl, int vis)
{
if (vis == VISIBILITY_DEFAULT)
fputs ("\n", asm_out_file);
}
else
- warning ("internal and protected visibility attributes not supported"
- "in this configuration; ignored");
+ warning (OPT_Wattributes, "internal and protected visibility attributes "
+ "not supported in this configuration; ignored");
}
/* Output a difference of two labels that will be an assembly time
static int darwin_dwarf_label_counter;
void
-darwin_asm_output_dwarf_delta (FILE *file, int size ATTRIBUTE_UNUSED,
+darwin_asm_output_dwarf_delta (FILE *file, int size,
const char *lab1, const char *lab2)
{
- const char *p = lab1 + (lab1[0] == '*');
- int islocaldiff = (p[0] == 'L');
+ int islocaldiff = (lab1[0] == '*' && lab1[1] == 'L'
+ && lab2[0] == '*' && lab2[1] == 'L');
+ const char *directive = (size == 8 ? ".quad" : ".long");
if (islocaldiff)
fprintf (file, "\t.set L$set$%d,", darwin_dwarf_label_counter);
else
- fprintf (file, "\t%s\t", ".long");
- assemble_name (file, lab1);
+ fprintf (file, "\t%s\t", directive);
+ assemble_name_raw (file, lab1);
fprintf (file, "-");
- assemble_name (file, lab2);
+ assemble_name_raw (file, lab2);
if (islocaldiff)
- fprintf (file, "\n\t.long L$set$%d", darwin_dwarf_label_counter++);
+ fprintf (file, "\n\t%s L$set$%d", directive, darwin_dwarf_label_counter++);
+}
+
+/* Output labels for the start of the DWARF sections if necessary. */
+void
+darwin_file_start (void)
+{
+ if (write_symbols == DWARF2_DEBUG)
+ {
+ static const char * const debugnames[] =
+ {
+ DEBUG_FRAME_SECTION,
+ DEBUG_INFO_SECTION,
+ DEBUG_ABBREV_SECTION,
+ DEBUG_ARANGES_SECTION,
+ DEBUG_MACINFO_SECTION,
+ DEBUG_LINE_SECTION,
+ DEBUG_LOC_SECTION,
+ DEBUG_PUBNAMES_SECTION,
+ DEBUG_STR_SECTION,
+ DEBUG_RANGES_SECTION
+ };
+ size_t i;
+
+ for (i = 0; i < ARRAY_SIZE (debugnames); i++)
+ {
+ int namelen;
+
+ switch_to_section (get_section (debugnames[i], SECTION_DEBUG, NULL));
+
+ gcc_assert (strncmp (debugnames[i], "__DWARF,", 8) == 0);
+ gcc_assert (strchr (debugnames[i] + 8, ','));
+
+ namelen = strchr (debugnames[i] + 8, ',') - (debugnames[i] + 8);
+ fprintf (asm_out_file, "Lsection%.*s:\n", namelen, debugnames[i] + 8);
+ }
+ }
+}
+
+/* Output an offset in a DWARF section on Darwin. On Darwin, DWARF section
+ offsets are not represented using relocs in .o files; either the
+ section never leaves the .o file, or the linker or other tool is
+ responsible for parsing the DWARF and updating the offsets. */
+
+void
+darwin_asm_output_dwarf_offset (FILE *file, int size, const char * lab,
+ section *base)
+{
+ char sname[64];
+ int namelen;
+
+ gcc_assert (base->common.flags & SECTION_NAMED);
+ gcc_assert (strncmp (base->named.name, "__DWARF,", 8) == 0);
+ gcc_assert (strchr (base->named.name + 8, ','));
+
+ namelen = strchr (base->named.name + 8, ',') - (base->named.name + 8);
+ sprintf (sname, "*Lsection%.*s", namelen, base->named.name + 8);
+ darwin_asm_output_dwarf_delta (file, size, lab, sname);
}
void
machopic_finish (asm_out_file);
if (strcmp (lang_hooks.name, "GNU C++") == 0)
{
- constructor_section ();
- destructor_section ();
+ switch_to_section (darwin_sections[constructor_section]);
+ switch_to_section (darwin_sections[destructor_section]);
ASM_OUTPUT_ALIGN (asm_out_file, 1);
}
+ fprintf (asm_out_file, "\t.subsections_via_symbols\n");
+}
+
+/* Cross-module name binding. Darwin does not support overriding
+ functions at dynamic-link time. */
+
+bool
+darwin_binds_local_p (tree decl)
+{
+ return default_binds_local_p_1 (decl, 0);
+}
+
+#if 0
+/* See TARGET_ASM_OUTPUT_ANCHOR for why we can't do this yet. */
+/* The Darwin's implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
+ anchor relative to ".", the current section position. We cannot use
+ the default one because ASM_OUTPUT_DEF is wrong for Darwin. */
+
+void
+darwin_asm_output_anchor (rtx symbol)
+{
+ fprintf (asm_out_file, "\t.set\t");
+ assemble_name (asm_out_file, XSTR (symbol, 0));
+ fprintf (asm_out_file, ", . + " HOST_WIDE_INT_PRINT_DEC "\n",
+ SYMBOL_REF_BLOCK_OFFSET (symbol));
+}
+#endif
+
+/* Set the darwin specific attributes on TYPE. */
+void
+darwin_set_default_type_attributes (tree type)
+{
+ if (darwin_ms_struct
+ && TREE_CODE (type) == RECORD_TYPE)
+ TYPE_ATTRIBUTES (type) = tree_cons (get_identifier ("ms_struct"),
+ NULL_TREE,
+ TYPE_ATTRIBUTES (type));
}
#include "gt-darwin.h"
OSDN Git Service
