/* Functions for generic Darwin as target machine for GNU C compiler.
Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002, 2003, 2004,
- 2005, 2006, 2007, 2008, 2009, 2010
+ 2005, 2006, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
Contributed by Apple Computer Inc.
#include "rtl.h"
#include "regs.h"
#include "hard-reg-set.h"
-#include "real.h"
#include "insn-config.h"
#include "conditions.h"
#include "insn-flags.h"
#include "langhooks.h"
#include "target.h"
#include "tm_p.h"
+#include "diagnostic-core.h"
#include "toplev.h"
#include "hashtab.h"
#include "df.h"
of MACHO_SYMBOL_STATIC for the code that handles @code{static}
symbol indirection. */
+/* For darwin >= 9 (OSX 10.5) the linker is capable of making the necessary
+ branch islands and we no longer need to emit darwin stubs.
+ However, if we are generating code for earlier systems (or for use in the
+ kernel) the stubs might still be required, and this will be set true. */
+int darwin_emit_branch_islands = false;
+
+/* A flag to determine whether we are running c++ or obj-c++. This has to be
+ settable from non-c-family contexts too (i.e. we can't use the c_dialect_
+ functions). */
+int darwin_running_cxx;
+
+/* Some code-gen now depends on OS major version numbers (at least). */
+int generating_for_darwin_version ;
+
/* Section names. */
section * darwin_sections[NUM_DARWIN_SECTIONS];
+/* While we transition to using in-tests instead of ifdef'd code. */
+#ifndef HAVE_lo_sum
+#define HAVE_lo_sum 0
+#define gen_macho_high(a,b) (a)
+#define gen_macho_low(a,b,c) (a)
+#endif
+
/* True if we're setting __attribute__ ((ms_struct)). */
int darwin_ms_struct = false;
+/* Earlier versions of Darwin as do not recognize an alignment field in
+ .comm directives, this should be set for versions that allow it. */
+int emit_aligned_common = false;
+
/* A get_unnamed_section callback used to switch to an ObjC section.
DIRECTIVE is as for output_section_asm_op. */
{
static bool been_here = false;
+ /* The NeXT ObjC Runtime requires these sections to be present and in
+ order in the object. The code below implements this by emitting
+ a section header for each ObjC section the first time that an ObjC
+ section is requested. */
if (! been_here)
{
+ section *saved_in_section = in_section;
static const enum darwin_section_enum tomark[] =
{
/* written, cold -> hot */
objc_class_vars_section,
objc_instance_vars_section,
objc_module_info_section,
- objc_symbols_section
+ objc_symbols_section,
};
+ /* ABI=1 */
+ static const enum darwin_section_enum tomarkv1[] =
+ {
+ objc1_protocol_ext_section,
+ objc1_class_ext_section,
+ objc1_prop_list_section
+ } ;
+ /* ABI=2 */
+ static const enum darwin_section_enum tomarkv2[] =
+ {
+ objc2_message_refs_section,
+ objc2_classdefs_section,
+ objc2_metadata_section,
+ objc2_classrefs_section,
+ objc2_classlist_section,
+ objc2_categorylist_section,
+ objc2_selector_refs_section,
+ objc2_nonlazy_class_section,
+ objc2_nonlazy_category_section,
+ objc2_protocollist_section,
+ objc2_protocolrefs_section,
+ objc2_super_classrefs_section,
+ objc2_image_info_section,
+ objc2_constant_string_object_section
+ } ;
size_t i;
been_here = true;
- for (i = 0; i < ARRAY_SIZE (tomark); i++)
- switch_to_section (darwin_sections[tomark[i]]);
+ if (flag_objc_abi < 2)
+ {
+ for (i = 0; i < ARRAY_SIZE (tomark); i++)
+ switch_to_section (darwin_sections[tomark[i]]);
+ if (flag_objc_abi == 1)
+ for (i = 0; i < ARRAY_SIZE (tomarkv1); i++)
+ switch_to_section (darwin_sections[tomarkv1[i]]);
+ }
+ else
+ for (i = 0; i < ARRAY_SIZE (tomarkv2); i++)
+ switch_to_section (darwin_sections[tomarkv2[i]]);
+ /* Make sure we don't get varasm.c out of sync with us. */
+ switch_to_section (saved_in_section);
}
output_section_asm_op (directive);
}
+
+/* Private flag applied to disable section-anchors in a particular section. */
+#define SECTION_NO_ANCHOR SECTION_MACH_DEP
+
+
/* Implement TARGET_ASM_INIT_SECTIONS. */
void
{
int c;
while ((c = *name++) != '\0')
- if (! ISIDNUM (c) && c != '.' && c != '$')
+ if (! ISIDNUM (c)
+ && c != '.' && c != '$' && c != '_' )
return 1;
return 0;
}
/* Return true if SYM_REF can be used without an indirection. */
-static int
+int
machopic_symbol_defined_p (rtx sym_ref)
{
if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_DEFINED)
return ! lprefix;
}
-
static int
machopic_data_defined_p (rtx sym_ref)
{
/* If dynamic-no-pic is on, we should not get here. */
gcc_assert (!MACHO_DYNAMIC_NO_PIC_P);
- current_name =
- IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl));
- if (function_base_func_name != current_name)
+ /* When we are generating _get_pc thunks within stubs, there is no current
+ function. */
+ if (current_function_decl)
+ {
+ current_name =
+ IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl));
+ if (function_base_func_name != current_name)
+ {
+ ++current_pic_label_num;
+ function_base_func_name = current_name;
+ }
+ }
+ else
{
++current_pic_label_num;
- function_base_func_name = current_name;
+ function_base_func_name = "L_machopic_stub_dummy";
}
- fprintf (file, "\"L%011d$pb\"", current_pic_label_num);
+ fprintf (file, "L%011d$pb", current_pic_label_num);
}
/* The suffix attached to non-lazy pointer symbols. */
}
else
{
- p = (machopic_indirection *) ggc_alloc (sizeof (machopic_indirection));
+ p = ggc_alloc_machopic_indirection ();
p->symbol = sym_ref;
p->ptr_name = xstrdup (buffer);
p->stub_p = stub_p;
if (defined && MACHO_DYNAMIC_NO_PIC_P)
{
-#if defined (TARGET_TOC)
+ if (DARWIN_PPC)
+ {
/* Create a new register for CSE opportunities. */
rtx hi_reg = (!can_create_pseudo_p () ? reg : gen_reg_rtx (Pmode));
emit_insn (gen_macho_high (hi_reg, orig));
emit_insn (gen_macho_low (reg, hi_reg, orig));
-#else
+ return reg;
+ }
+ else if (DARWIN_X86)
+ return orig;
+ else
/* some other cpu -- writeme! */
gcc_unreachable ();
-#endif
- return reg;
}
else if (defined)
{
-#if defined (TARGET_TOC) || defined (HAVE_lo_sum)
- rtx offset = machopic_gen_offset (orig);
-#endif
+ rtx offset = NULL;
+ if (DARWIN_PPC || HAVE_lo_sum)
+ offset = machopic_gen_offset (orig);
-#if defined (TARGET_TOC) /* i.e., PowerPC */
+ if (DARWIN_PPC)
+ {
rtx hi_sum_reg = (!can_create_pseudo_p ()
? reg
: gen_reg_rtx (Pmode));
copy_rtx (offset))));
orig = reg;
-#else
-#if defined (HAVE_lo_sum)
+ }
+ else if (HAVE_lo_sum)
+ {
gcc_assert (reg);
emit_insn (gen_rtx_SET (VOIDmode, reg,
emit_use (pic_offset_table_rtx);
orig = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, reg);
-#endif
-#endif
+ }
return orig;
}
ptr_ref = gen_const_mem (Pmode, ptr_ref);
machopic_define_symbol (ptr_ref);
+ if (DARWIN_X86
+ && reg
+ && MACHO_DYNAMIC_NO_PIC_P)
+ {
+ emit_insn (gen_rtx_SET (Pmode, reg, ptr_ref));
+ ptr_ref = reg;
+ }
+
return ptr_ref;
}
else if (GET_CODE (orig) == CONST)
{
- rtx base, result;
-
- /* legitimize both operands of the PLUS */
+ /* If "(const (plus ...", walk the PLUS and return that result.
+ PLUS processing (below) will restore the "(const ..." if
+ appropriate. */
if (GET_CODE (XEXP (orig, 0)) == PLUS)
+ return machopic_indirect_data_reference (XEXP (orig, 0), reg);
+ else
+ return orig;
+ }
+ else if (GET_CODE (orig) == MEM)
+ {
+ XEXP (ptr_ref, 0) =
+ machopic_indirect_data_reference (XEXP (orig, 0), reg);
+ return ptr_ref;
+ }
+ else if (GET_CODE (orig) == PLUS)
+ {
+ rtx base, result;
+ /* When the target is i386, this code prevents crashes due to the
+ compiler's ignorance on how to move the PIC base register to
+ other registers. (The reload phase sometimes introduces such
+ insns.) */
+ if (GET_CODE (XEXP (orig, 0)) == REG
+ && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM
+ /* Prevent the same register from being erroneously used
+ as both the base and index registers. */
+ && (DARWIN_X86 && (GET_CODE (XEXP (orig, 1)) == CONST))
+ && reg)
{
- base = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 0),
- reg);
- orig = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 1),
- (base == reg ? 0 : reg));
+ emit_move_insn (reg, XEXP (orig, 0));
+ XEXP (ptr_ref, 0) = reg;
+ return ptr_ref;
}
- else
- return orig;
- if (MACHOPIC_PURE && GET_CODE (orig) == CONST_INT)
+ /* Legitimize both operands of the PLUS. */
+ base = machopic_indirect_data_reference (XEXP (orig, 0), reg);
+ orig = machopic_indirect_data_reference (XEXP (orig, 1),
+ (base == reg ? 0 : reg));
+ if (MACHOPIC_INDIRECT && (GET_CODE (orig) == CONST_INT))
result = plus_constant (base, INTVAL (orig));
else
result = gen_rtx_PLUS (Pmode, base, orig);
}
return result;
-
- }
- else if (GET_CODE (orig) == MEM)
- XEXP (ptr_ref, 0) = machopic_indirect_data_reference (XEXP (orig, 0), reg);
- /* When the target is i386, this code prevents crashes due to the
- compiler's ignorance on how to move the PIC base register to
- other registers. (The reload phase sometimes introduces such
- insns.) */
- else if (GET_CODE (orig) == PLUS
- && GET_CODE (XEXP (orig, 0)) == REG
- && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM
-#ifdef I386
- /* Prevent the same register from being erroneously used
- as both the base and index registers. */
- && GET_CODE (XEXP (orig, 1)) == CONST
-#endif
- && reg)
- {
- emit_move_insn (reg, XEXP (orig, 0));
- XEXP (ptr_ref, 0) = reg;
}
return ptr_ref;
}
rtx
machopic_indirect_call_target (rtx target)
{
+ if (! darwin_emit_branch_islands)
+ return target;
+
if (GET_CODE (target) != MEM)
return target;
reg = gen_reg_rtx (Pmode);
}
-#ifdef HAVE_lo_sum
+#if HAVE_lo_sum
if (MACHO_DYNAMIC_NO_PIC_P
&& (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
|| GET_CODE (XEXP (orig, 0)) == LABEL_REF))
else
{
-#ifdef HAVE_lo_sum
+#if HAVE_lo_sum
if (GET_CODE (orig) == SYMBOL_REF
|| GET_CODE (orig) == LABEL_REF)
{
{
switch_to_section (data_section);
assemble_align (GET_MODE_ALIGNMENT (Pmode));
- assemble_label (ptr_name);
+ assemble_label (asm_out_file, ptr_name);
assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name),
GET_MODE_SIZE (Pmode),
GET_MODE_ALIGNMENT (Pmode), 1);
void
darwin_mark_decl_preserved (const char *name)
{
- fprintf (asm_out_file, ".no_dead_strip ");
+ fprintf (asm_out_file, "\t.no_dead_strip ");
assemble_name (asm_out_file, name);
fputc ('\n', asm_out_file);
}
static section *
-darwin_text_section (int reloc, int weak)
-{
- if (reloc)
- return (weak
- ? darwin_sections[text_unlikely_coal_section]
- : unlikely_text_section ());
- else
- return (weak
- ? darwin_sections[text_coal_section]
- : text_section);
-}
-
-static section *
-darwin_rodata_section (int weak)
+darwin_rodata_section (int weak, bool zsize)
{
return (weak
? darwin_sections[const_coal_section]
- : darwin_sections[const_section]);
+ : (zsize ? darwin_sections[zobj_const_section]
+ : darwin_sections[const_section]));
}
static section *
darwin_mergeable_string_section (tree exp,
unsigned HOST_WIDE_INT align)
{
- if (flag_merge_constants
+ /* Darwin's ld expects to see non-writable string literals in the .cstring
+ section. Later versions of ld check and complain when CFStrings are
+ enabled. Therefore we shall force the strings into .cstring since we
+ don't support writable ones anyway. */
+ if ((darwin_constant_cfstrings || flag_merge_constants)
&& TREE_CODE (exp) == STRING_CST
&& TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE
&& align <= 256
== strlen (TREE_STRING_POINTER (exp)) + 1))
return darwin_sections[cstring_section];
+ if (DARWIN_SECTION_ANCHORS && flag_section_anchors
+ && TREE_CODE (exp) == STRING_CST
+ && TREE_STRING_LENGTH (exp) == 0)
+ return darwin_sections[zobj_const_section];
+
return readonly_data_section;
}
static section *
darwin_mergeable_constant_section (tree exp,
- unsigned HOST_WIDE_INT align)
+ unsigned HOST_WIDE_INT align,
+ bool zsize)
{
enum machine_mode mode = DECL_MODE (exp);
unsigned int modesize = GET_MODE_BITSIZE (mode);
+ if (DARWIN_SECTION_ANCHORS
+ && flag_section_anchors
+ && zsize)
+ return darwin_sections[zobj_const_section];
+
if (flag_merge_constants
&& mode != VOIDmode
&& mode != BLKmode
return readonly_data_section;
}
+section *
+darwin_tm_clone_table_section (void)
+{
+ return get_named_section (NULL,
+ "__DATA,__tm_clone_table,regular,no_dead_strip",
+ 3);
+}
+
int
machopic_reloc_rw_mask (void)
{
return MACHOPIC_INDIRECT ? 3 : 0;
}
+/* We have to deal with ObjC/C++ metadata section placement in the common
+ code, since it will also be called from LTO.
+
+ Return metadata attributes, if present (searching for ABI=2 first)
+ Return NULL_TREE if no such attributes are found. */
+
+static tree
+is_objc_metadata (tree decl)
+{
+ if (DECL_P (decl)
+ && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == CONST_DECL)
+ && DECL_ATTRIBUTES (decl))
+ {
+ tree meta = lookup_attribute ("OBJC2META", DECL_ATTRIBUTES (decl));
+ if (meta)
+ return meta;
+ meta = lookup_attribute ("OBJC1META", DECL_ATTRIBUTES (decl));
+ if (meta)
+ return meta;
+ }
+ return NULL_TREE;
+}
+
+/* Return the section required for Objective C ABI 2 metadata. */
+static section *
+darwin_objc2_section (tree decl ATTRIBUTE_UNUSED, tree meta, section * base)
+{
+ const char *p;
+ tree ident = TREE_VALUE (meta);
+ gcc_assert (TREE_CODE (ident) == IDENTIFIER_NODE);
+ p = IDENTIFIER_POINTER (ident);
+
+ /* If we are in LTO, then we don't know the state of flag_next_runtime
+ or flag_objc_abi when the code was generated. We set these from the
+ meta-data - which is needed to deal with const string constructors. */
+
+ flag_next_runtime = 1;
+ flag_objc_abi = 2;
+
+ if (base == data_section)
+ base = darwin_sections[objc2_metadata_section];
+
+ /* Most of the OBJC2 META-data end up in the base section, so check it
+ first. */
+ if (!strncmp (p, "V2_BASE", 7))
+ return base;
+ else if (!strncmp (p, "V2_STRG", 7))
+ return darwin_sections[cstring_section];
+
+ else if (!strncmp (p, "G2_META", 7) || !strncmp (p, "G2_CLAS", 7))
+ return darwin_sections[objc2_classdefs_section];
+ else if (!strncmp (p, "V2_MREF", 7))
+ return darwin_sections[objc2_message_refs_section];
+ else if (!strncmp (p, "V2_CLRF", 7))
+ return darwin_sections[objc2_classrefs_section];
+ else if (!strncmp (p, "V2_SURF", 7))
+ return darwin_sections[objc2_super_classrefs_section];
+ else if (!strncmp (p, "V2_NLCL", 7))
+ return darwin_sections[objc2_nonlazy_class_section];
+ else if (!strncmp (p, "V2_CLAB", 7))
+ return darwin_sections[objc2_classlist_section];
+ else if (!strncmp (p, "V2_SRFS", 7))
+ return darwin_sections[objc2_selector_refs_section];
+ else if (!strncmp (p, "V2_NLCA", 7))
+ return darwin_sections[objc2_nonlazy_category_section];
+ else if (!strncmp (p, "V2_CALA", 7))
+ return darwin_sections[objc2_categorylist_section];
+
+ else if (!strncmp (p, "V2_PLST", 7))
+ return darwin_sections[objc2_protocollist_section];
+ else if (!strncmp (p, "V2_PRFS", 7))
+ return darwin_sections[objc2_protocolrefs_section];
+
+ else if (!strncmp (p, "V2_INFO", 7))
+ return darwin_sections[objc2_image_info_section];
+
+ else if (!strncmp (p, "V2_EHTY", 7))
+ return darwin_sections[data_coal_section];
+
+ else if (!strncmp (p, "V2_CSTR", 7))
+ return darwin_sections[objc2_constant_string_object_section];
+
+ /* Not recognized, default. */
+ return base;
+}
+
+/* Return the section required for Objective C ABI 0/1 metadata. */
+static section *
+darwin_objc1_section (tree decl ATTRIBUTE_UNUSED, tree meta, section * base)
+{
+ const char *p;
+ tree ident = TREE_VALUE (meta);
+ gcc_assert (TREE_CODE (ident) == IDENTIFIER_NODE);
+ p = IDENTIFIER_POINTER (ident);
+
+ /* If we are in LTO, then we don't know the state of flag_next_runtime
+ or flag_objc_abi when the code was generated. We set these from the
+ meta-data - which is needed to deal with const string constructors. */
+ flag_next_runtime = 1;
+ if (!global_options_set.x_flag_objc_abi)
+ flag_objc_abi = 1;
+
+ /* String sections first, cos there are lots of strings. */
+ if (!strncmp (p, "V1_STRG", 7))
+ return darwin_sections[cstring_section];
+ else if (!strncmp (p, "V1_CLSN", 7))
+ return darwin_sections[objc_class_names_section];
+ else if (!strncmp (p, "V1_METN", 7))
+ return darwin_sections[objc_meth_var_names_section];
+ else if (!strncmp (p, "V1_METT", 7))
+ return darwin_sections[objc_meth_var_types_section];
+
+ else if (!strncmp (p, "V1_CLAS", 7))
+ return darwin_sections[objc_class_section];
+ else if (!strncmp (p, "V1_META", 7))
+ return darwin_sections[objc_meta_class_section];
+ else if (!strncmp (p, "V1_CATG", 7))
+ return darwin_sections[objc_category_section];
+ else if (!strncmp (p, "V1_PROT", 7))
+ return darwin_sections[objc_protocol_section];
+
+ else if (!strncmp (p, "V1_CLCV", 7))
+ return darwin_sections[objc_class_vars_section];
+ else if (!strncmp (p, "V1_CLIV", 7))
+ return darwin_sections[objc_instance_vars_section];
+
+ else if (!strncmp (p, "V1_CLCM", 7))
+ return darwin_sections[objc_cls_meth_section];
+ else if (!strncmp (p, "V1_CLIM", 7))
+ return darwin_sections[objc_inst_meth_section];
+ else if (!strncmp (p, "V1_CACM", 7))
+ return darwin_sections[objc_cat_cls_meth_section];
+ else if (!strncmp (p, "V1_CAIM", 7))
+ return darwin_sections[objc_cat_inst_meth_section];
+ else if (!strncmp (p, "V1_PNSM", 7))
+ return darwin_sections[objc_cat_inst_meth_section];
+ else if (!strncmp (p, "V1_PCLM", 7))
+ return darwin_sections[objc_cat_cls_meth_section];
+
+ else if (!strncmp (p, "V1_CLPR", 7))
+ return darwin_sections[objc_cat_cls_meth_section];
+ else if (!strncmp (p, "V1_CAPR", 7))
+ return darwin_sections[objc_category_section]; /* ??? CHECK me. */
+
+ else if (!strncmp (p, "V1_PRFS", 7))
+ return darwin_sections[objc_cat_cls_meth_section];
+ else if (!strncmp (p, "V1_CLRF", 7))
+ return darwin_sections[objc_cls_refs_section];
+ else if (!strncmp (p, "V1_SRFS", 7))
+ return darwin_sections[objc_selector_refs_section];
+
+ else if (!strncmp (p, "V1_MODU", 7))
+ return darwin_sections[objc_module_info_section];
+ else if (!strncmp (p, "V1_SYMT", 7))
+ return darwin_sections[objc_symbols_section];
+ else if (!strncmp (p, "V1_INFO", 7))
+ return darwin_sections[objc_image_info_section];
+
+ else if (!strncmp (p, "V1_PLST", 7))
+ return darwin_sections[objc1_prop_list_section];
+ else if (!strncmp (p, "V1_PEXT", 7))
+ return darwin_sections[objc1_protocol_ext_section];
+ else if (!strncmp (p, "V1_CEXT", 7))
+ return darwin_sections[objc1_class_ext_section];
+
+ else if (!strncmp (p, "V2_CSTR", 7))
+ return darwin_sections[objc_constant_string_object_section];
+
+ return base;
+}
+
section *
machopic_select_section (tree decl,
int reloc,
unsigned HOST_WIDE_INT align)
{
- bool weak = (DECL_P (decl)
- && DECL_WEAK (decl)
- && !lookup_attribute ("weak_import",
- DECL_ATTRIBUTES (decl)));
- section *base_section;
+ bool zsize, one, weak, ro;
+ section *base_section = NULL;
+
+ weak = (DECL_P (decl)
+ && DECL_WEAK (decl)
+ && !lookup_attribute ("weak_import", DECL_ATTRIBUTES (decl)));
+
+ zsize = (DECL_P (decl)
+ && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == CONST_DECL)
+ && tree_low_cst (DECL_SIZE_UNIT (decl), 1) == 0);
+
+ one = DECL_P (decl)
+ && TREE_CODE (decl) == VAR_DECL
+ && DECL_ONE_ONLY (decl);
+
+ ro = TREE_READONLY (decl) || TREE_CONSTANT (decl) ;
switch (categorize_decl_for_section (decl, reloc))
{
case SECCAT_TEXT:
- base_section = darwin_text_section (reloc, weak);
+ gcc_unreachable ();
break;
case SECCAT_RODATA:
case SECCAT_SRODATA:
- base_section = darwin_rodata_section (weak);
+ base_section = darwin_rodata_section (weak, zsize);
break;
case SECCAT_RODATA_MERGE_STR:
break;
case SECCAT_RODATA_MERGE_CONST:
- base_section = darwin_mergeable_constant_section (decl, align);
+ base_section = darwin_mergeable_constant_section (decl, align, zsize);
break;
case SECCAT_DATA:
case SECCAT_DATA_REL_RO_LOCAL:
case SECCAT_SDATA:
case SECCAT_TDATA:
+ if (weak || one)
+ {
+ if (ro)
+ base_section = darwin_sections[const_data_coal_section];
+ else
+ base_section = darwin_sections[data_coal_section];
+ }
+ else if (DARWIN_SECTION_ANCHORS
+ && flag_section_anchors
+ && zsize)
+ {
+ /* If we're doing section anchors, then punt zero-sized objects into
+ their own sections so that they don't interfere with offset
+ computation for the remaining vars. This does not need to be done
+ for stuff in mergeable sections, since these are ineligible for
+ anchors. */
+ if (ro)
+ base_section = darwin_sections[zobj_const_data_section];
+ else
+ base_section = darwin_sections[zobj_data_section];
+ }
+ else if (ro)
+ base_section = darwin_sections[const_data_section];
+ else
+ base_section = data_section;
+ break;
case SECCAT_BSS:
case SECCAT_SBSS:
case SECCAT_TBSS:
- if (TREE_READONLY (decl) || TREE_CONSTANT (decl))
- base_section = weak ? darwin_sections[const_data_coal_section]
- : darwin_sections[const_data_section];
+ if (weak || one)
+ base_section = darwin_sections[data_coal_section];
else
- base_section = weak ? darwin_sections[data_coal_section] : data_section;
+ {
+ if (!TREE_PUBLIC (decl))
+ base_section = lcomm_section;
+ else if (bss_noswitch_section)
+ base_section = bss_noswitch_section;
+ else
+ base_section = data_section;
+ }
break;
default:
gcc_unreachable ();
}
- /* Darwin weird special cases. */
+ /* Darwin weird special cases.
+ a) OBJC Meta-data. */
+ if (DECL_P (decl)
+ && (TREE_CODE (decl) == VAR_DECL
+ || TREE_CODE (decl) == CONST_DECL)
+ && DECL_ATTRIBUTES (decl))
+ {
+ tree meta = lookup_attribute ("OBJC2META", DECL_ATTRIBUTES (decl));
+ if (meta)
+ return darwin_objc2_section (decl, meta, base_section);
+ meta = lookup_attribute ("OBJC1META", DECL_ATTRIBUTES (decl));
+ if (meta)
+ return darwin_objc1_section (decl, meta, base_section);
+ meta = lookup_attribute ("OBJC1METG", DECL_ATTRIBUTES (decl));
+ if (meta)
+ return base_section; /* GNU runtime is happy with it all in one pot. */
+ }
+
+ /* b) Constant string objects. */
if (TREE_CODE (decl) == CONSTRUCTOR
&& TREE_TYPE (decl)
&& TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
if (TREE_CODE (name) == TYPE_DECL)
name = DECL_NAME (name);
+ /* FIXME: This is unsatisfactory for LTO, since it relies on other
+ metadata determining the source FE. */
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];
- }
+ {
+ if (flag_next_runtime)
+ {
+ if (flag_objc_abi == 2)
+ return darwin_sections[objc2_constant_string_object_section];
+ else
+ return darwin_sections[objc_constant_string_object_section];
+ }
+ else
+ return darwin_sections[objc_string_object_section];
+ }
+ else if (!strcmp (IDENTIFIER_POINTER (name), "__builtin_CFString"))
+ return darwin_sections[cfstring_constant_object_section];
else
- return base_section;
+ return base_section;
}
+ /* c) legacy meta-data selection. */
else if (TREE_CODE (decl) == VAR_DECL
&& DECL_NAME (decl)
&& TREE_CODE (DECL_NAME (decl)) == IDENTIFIER_NODE
&& IDENTIFIER_POINTER (DECL_NAME (decl))
+ && flag_next_runtime
&& !strncmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "_OBJC_", 6))
{
const char *name = IDENTIFIER_POINTER (DECL_NAME (decl));
-
+ static bool warned_objc_46 = false;
+ /* We shall assert that zero-sized objects are an error in ObjC
+ meta-data. */
+ gcc_assert (tree_low_cst (DECL_SIZE_UNIT (decl), 1) != 0);
+
+ /* ??? This mechanism for determining the metadata section is
+ broken when LTO is in use, since the frontend that generated
+ the data is not identified. We will keep the capability for
+ the short term - in case any non-Objective-C programs are using
+ it to place data in specified sections. */
+ if (!warned_objc_46)
+ {
+ location_t loc = DECL_SOURCE_LOCATION (decl);
+ warning_at (loc, 0, "the use of _OBJC_-prefixed variable names"
+ " to select meta-data sections is deprecated at 4.6"
+ " and will be removed in 4.7");
+ warned_objc_46 = true;
+ }
+
if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20))
return darwin_sections[objc_cls_meth_section];
else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23))
return darwin_sections[objc_inst_meth_section];
- else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 20))
+ else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 29))
return darwin_sections[objc_cat_cls_meth_section];
- else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 23))
+ else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 32))
return darwin_sections[objc_cat_inst_meth_section];
else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22))
return darwin_sections[objc_class_vars_section];
return (!strncmp ((const char *)p, "_OBJC_", 6));
}
-/* LTO support for Mach-O. */
+/* LTO support for Mach-O.
+
+ This version uses three mach-o sections to encapsulate the (unlimited
+ number of) lto sections.
+
+ __GNU_LTO, __lto_sections contains the concatented GNU LTO section data.
+ __GNU_LTO, __section_names contains the GNU LTO section names.
+ __GNU_LTO, __section_index contains an array of values that index these.
+
+ Indexed thus:
+ <section offset from the start of __GNU_LTO, __lto_sections>,
+ <section length>
+ <name offset from the start of __GNU_LTO, __section_names,
+ <name length>.
+
+ At present, for both m32 and m64 mach-o files each of these fields is
+ represented by a uint32_t. This is because, AFAICT, a mach-o object
+ cannot exceed 4Gb because the section_64 offset field (see below) is 32bits.
+
+ uint32_t offset;
+ "offset An integer specifying the offset to this section in the file." */
-/* Section names for LTO sections. */
-static unsigned int lto_section_names_offset = 0;
+/* Count lto section numbers. */
+static unsigned int lto_section_num = 0;
-/* This is the obstack which we use to allocate the many strings. */
-static struct obstack lto_section_names_obstack;
+/* A vector of information about LTO sections, at present, we only have
+ the name. TODO: see if we can get the data length somehow. */
+typedef struct GTY (()) darwin_lto_section_e {
+ const char *sectname;
+} darwin_lto_section_e ;
+DEF_VEC_O(darwin_lto_section_e);
+DEF_VEC_ALLOC_O(darwin_lto_section_e, gc);
-/* Segment name for LTO sections. */
+static GTY (()) VEC (darwin_lto_section_e, gc) * lto_section_names;
+
+/* Segment for LTO data. */
#define LTO_SEGMENT_NAME "__GNU_LTO"
-/* Section name for LTO section names section. */
-#define LTO_NAMES_SECTION "__section_names"
+/* Section wrapper scheme (used here to wrap the unlimited number of LTO
+ sections into three Mach-O ones).
+ NOTE: These names MUST be kept in sync with those in
+ libiberty/simple-object-mach-o. */
+#define LTO_SECTS_SECTION "__wrapper_sects"
+#define LTO_NAMES_SECTION "__wrapper_names"
+#define LTO_INDEX_SECTION "__wrapper_index"
/* File to temporarily store LTO data. This is appended to asm_out_file
in darwin_end_file. */
saved_asm_out_file = NULL;
}
+static void
+darwin_asm_dwarf_section (const char *name, unsigned int flags, tree decl);
+
+/* Called for the TARGET_ASM_NAMED_SECTION hook. */
+
void
darwin_asm_named_section (const char *name,
unsigned int flags,
tree decl ATTRIBUTE_UNUSED)
{
- /* LTO sections go in a special segment __GNU_LTO. We want to replace the
- section name with something we can use to represent arbitrary-length
- names (section names in Mach-O are at most 16 characters long). */
+ /* LTO sections go in a special section that encapsulates the (unlimited)
+ number of GNU LTO sections within a single mach-o one. */
if (strncmp (name, LTO_SECTION_NAME_PREFIX,
strlen (LTO_SECTION_NAME_PREFIX)) == 0)
{
+ darwin_lto_section_e e;
/* We expect certain flags to be set... */
gcc_assert ((flags & (SECTION_DEBUG | SECTION_NAMED))
== (SECTION_DEBUG | SECTION_NAMED));
- /* Add the section name to the things to output when we end the
- current assembler output file.
- This is all not very efficient, but that doesn't matter -- this
- shouldn't be a hot path in the compiler... */
- obstack_1grow (<o_section_names_obstack, '\t');
- obstack_grow (<o_section_names_obstack, ".ascii ", 7);
- obstack_1grow (<o_section_names_obstack, '"');
- obstack_grow (<o_section_names_obstack, name, strlen (name));
- obstack_grow (<o_section_names_obstack, "\\0\"\n", 4);
-
- /* Output the dummy section name. */
- fprintf (asm_out_file, "\t# %s\n", name);
- fprintf (asm_out_file, "\t.section %s,__%08X,regular,debug\n",
- LTO_SEGMENT_NAME, lto_section_names_offset);
-
- /* Update the offset for the next section name. Make sure we stay
- within reasonable length. */
- lto_section_names_offset += strlen (name) + 1;
- gcc_assert (lto_section_names_offset > 0
- && lto_section_names_offset < ((unsigned) 1 << 31));
- }
+ /* Switch to our combined section. */
+ fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n",
+ LTO_SEGMENT_NAME, LTO_SECTS_SECTION);
+ /* Output a label for the start of this sub-section. */
+ fprintf (asm_out_file, "L_GNU_LTO%d:\t;# %s\n",
+ lto_section_num, name);
+ /* We have to jump through hoops to get the values of the intra-section
+ offsets... */
+ fprintf (asm_out_file, "\t.set L$gnu$lto$offs%d,L_GNU_LTO%d-L_GNU_LTO0\n",
+ lto_section_num, lto_section_num);
+ fprintf (asm_out_file,
+ "\t.set L$gnu$lto$size%d,L_GNU_LTO%d-L_GNU_LTO%d\n",
+ lto_section_num, lto_section_num+1, lto_section_num);
+ lto_section_num++;
+ e.sectname = xstrdup (name);
+ /* Keep the names, we'll need to make a table later.
+ TODO: check that we do not revisit sections, that would break
+ the assumption of how this is done. */
+ if (lto_section_names == NULL)
+ lto_section_names = VEC_alloc (darwin_lto_section_e, gc, 16);
+ VEC_safe_push (darwin_lto_section_e, gc, lto_section_names, &e);
+ }
+ else if (strncmp (name, "__DWARF,", 8) == 0)
+ darwin_asm_dwarf_section (name, flags, decl);
else
fprintf (asm_out_file, "\t.section %s\n", name);
}
void
darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty)
{
- char *lab;
-
- if (! for_eh)
+ char *lab ;
+ char buf[32];
+ static int invok_count = 0;
+ static tree last_fun_decl = NULL_TREE;
+
+ /* We use the linker to emit the .eh labels for Darwin 9 and above. */
+ if (! for_eh || generating_for_darwin_version >= 9)
return;
- lab = concat (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)), ".eh", NULL);
+ /* FIXME: This only works when the eh for all sections of a function is
+ emitted at the same time. If that changes, we would need to use a lookup
+ table of some form to determine what to do. Also, we should emit the
+ unadorned label for the partition containing the public label for a
+ function. This is of limited use, probably, since we do not currently
+ enable partitioning. */
+ strcpy (buf, ".eh");
+ if (decl && TREE_CODE (decl) == FUNCTION_DECL)
+ {
+ if (decl == last_fun_decl)
+ {
+ invok_count++;
+ snprintf (buf, 31, "$$part$$%d.eh", invok_count);
+ }
+ else
+ {
+ last_fun_decl = decl;
+ invok_count = 0;
+ }
+ }
+
+ lab = concat (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)), buf, NULL);
if (TREE_PUBLIC (decl))
{
fputs ("-.", file);
}
+/* If this is uncommented, details of each allocation will be printed
+ in the asm right before the actual code. WARNING - this will cause some
+ test-suite fails (since the printout will contain items that some tests
+ are not expecting) -- so don't leave it on by default (it bloats the
+ asm too). */
+/*#define DEBUG_DARWIN_MEM_ALLOCATORS*/
+
+/* The first two of these routines are ostensibly just intended to put
+ names into the asm. However, they are both hijacked in order to ensure
+ that zero-sized items do not make their way into the output. Consequently,
+ we also need to make these participate in provisions for dealing with
+ such items in section anchors. */
+
+/* The implementation of ASM_DECLARE_OBJECT_NAME. */
+/* The RTTI data (e.g., __ti4name) is common and public (and static),
+ but it does need to be referenced via indirect PIC data pointers.
+ The machopic_define_symbol calls are telling the machopic subsystem
+ that the name *is* defined in this module, so it doesn't need to
+ make them indirect. */
+void
+darwin_asm_declare_object_name (FILE *file,
+ const char *nam, tree decl)
+{
+ const char *xname = nam;
+ unsigned HOST_WIDE_INT size;
+ bool local_def, weak;
+
+ weak = (DECL_P (decl)
+ && DECL_WEAK (decl)
+ && !lookup_attribute ("weak_import",
+ DECL_ATTRIBUTES (decl)));
+
+ local_def = DECL_INITIAL (decl) || (TREE_STATIC (decl)
+ && (!DECL_COMMON (decl)
+ || !TREE_PUBLIC (decl)));
+
+ if (GET_CODE (XEXP (DECL_RTL (decl), 0)) != SYMBOL_REF)
+ xname = IDENTIFIER_POINTER (DECL_NAME (decl));
+
+ if (local_def)
+ {
+ (* targetm.encode_section_info) (decl, DECL_RTL (decl), false);
+ if (!weak)
+ machopic_define_symbol (DECL_RTL (decl));
+ }
+
+ size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
+
+#ifdef DEBUG_DARWIN_MEM_ALLOCATORS
+fprintf (file, "# dadon: %s %s (%llu, %u) local %d weak %d"
+ " stat %d com %d pub %d t-const %d t-ro %d init %lx\n",
+ xname, (TREE_CODE (decl) == VAR_DECL?"var":"const"),
+ (unsigned long long)size, DECL_ALIGN (decl), local_def,
+ DECL_WEAK (decl), TREE_STATIC (decl), DECL_COMMON (decl),
+ TREE_PUBLIC (decl), TREE_CONSTANT (decl), TREE_READONLY (decl),
+ (unsigned long)DECL_INITIAL (decl));
+#endif
+
+ /* Darwin needs help to support local zero-sized objects.
+ They must be made at least one byte, and the section containing must be
+ marked as unsuitable for section-anchors (see storage allocators below).
+
+ For non-zero objects this output is handled by varasm.c.
+ */
+ if (!size)
+ {
+ unsigned int l2align = 0;
+
+ /* The align must be honored, even for zero-sized. */
+ if (DECL_ALIGN (decl))
+ {
+ l2align = floor_log2 (DECL_ALIGN (decl) / BITS_PER_UNIT);
+ fprintf (file, "\t.align\t%u\n", l2align);
+ }
+
+ ASM_OUTPUT_LABEL (file, xname);
+ size = 1;
+ fprintf (file, "\t.space\t"HOST_WIDE_INT_PRINT_UNSIGNED"\n", size);
+
+ /* Check that we've correctly picked up the zero-sized item and placed it
+ properly. */
+ gcc_assert ((!DARWIN_SECTION_ANCHORS || !flag_section_anchors)
+ || (in_section
+ && (in_section->common.flags & SECTION_NO_ANCHOR)));
+ }
+ else
+ ASM_OUTPUT_LABEL (file, xname);
+}
+
+/* The implementation of ASM_DECLARE_CONSTANT_NAME. */
+void
+darwin_asm_declare_constant_name (FILE *file, const char *name,
+ const_tree exp ATTRIBUTE_UNUSED,
+ HOST_WIDE_INT size)
+{
+ assemble_label (file, name);
+ /* As for other items, we need at least one byte. */
+ if (!size)
+ {
+ fputs ("\t.space\t1\n", file);
+ /* Check that we've correctly picked up the zero-sized item and placed it
+ properly. */
+ gcc_assert ((!DARWIN_SECTION_ANCHORS || !flag_section_anchors)
+ || (in_section
+ && (in_section->common.flags & SECTION_NO_ANCHOR)));
+ }
+}
+
+/* Darwin storage allocators.
+
+ Zerofill sections are desirable for large blank data since, otherwise, these
+ data bloat objects (PR33210).
+
+ However, section anchors don't work in .zerofill sections (one cannot switch
+ to a zerofill section). Ergo, for Darwin targets using section anchors we need
+ to put (at least some) data into 'normal' switchable sections.
+
+ Here we set a relatively arbitrary value for the size of an object to trigger
+ zerofill when section anchors are enabled (anything bigger than a page for
+ current Darwin implementations). FIXME: there ought to be some objective way
+ to make this choice.
+
+ When section anchor are off this is ignored anyway. */
+
+#define BYTES_ZFILL 4096
+
+/* Emit a chunk of data for items coalesced by the linker. */
+static void
+darwin_emit_weak_or_comdat (FILE *fp, tree decl, const char *name,
+ unsigned HOST_WIDE_INT size,
+ unsigned int align)
+{
+ /* Since the sections used here are coalesed, they will not be eligible
+ for section anchors, and therefore we don't need to break that out. */
+ if (TREE_READONLY (decl) || TREE_CONSTANT (decl))
+ switch_to_section (darwin_sections[const_data_coal_section]);
+ else
+ switch_to_section (darwin_sections[data_coal_section]);
+
+ /* To be consistent, we'll allow darwin_asm_declare_object_name to assemble
+ the align info for zero-sized items... but do it here otherwise. */
+ if (size && align)
+ fprintf (fp, "\t.align\t%d\n", floor_log2 (align / BITS_PER_UNIT));
+
+ if (TREE_PUBLIC (decl))
+ darwin_globalize_label (fp, name);
+
+ /* ... and we let it deal with outputting one byte of zero for them too. */
+ darwin_asm_declare_object_name (fp, name, decl);
+ if (size)
+ assemble_zeros (size);
+}
+
+/* Emit a chunk of data for ObjC meta-data that got placed in BSS erroneously. */
+static void
+darwin_emit_objc_zeroed (FILE *fp, tree decl, const char *name,
+ unsigned HOST_WIDE_INT size,
+ unsigned int align, tree meta)
+{
+ section *ocs = data_section;
+
+ if (TREE_PURPOSE (meta) == get_identifier("OBJC2META"))
+ ocs = darwin_objc2_section (decl, meta, ocs);
+ else
+ ocs = darwin_objc1_section (decl, meta, ocs);
+
+ switch_to_section (ocs);
+
+ /* We shall declare that zero-sized meta-data are not valid (yet). */
+ gcc_assert (size);
+ fprintf (fp, "\t.align\t%d\n", floor_log2 (align / BITS_PER_UNIT));
+
+ /* ... and we let it deal with outputting one byte of zero for them too. */
+ darwin_asm_declare_object_name (fp, name, decl);
+ assemble_zeros (size);
+}
+
+/* This routine emits 'local' storage:
+
+ When Section Anchors are off this routine emits .zerofill commands in
+ sections named for their alignment.
+
+ When Section Anchors are on, smaller (non-zero-sized) items are placed in
+ the .static_data section so that the section anchoring system can see them.
+ Larger items are still placed in .zerofill sections, addressing PR33210.
+ The routine has no checking - it is all assumed to be done by the caller.
+*/
+static void
+darwin_emit_local_bss (FILE *fp, tree decl, const char *name,
+ unsigned HOST_WIDE_INT size,
+ unsigned int l2align)
+{
+ /* FIXME: We have a fudge to make this work with Java even when the target does
+ not use sections anchors -- Java seems to need at least one small item in a
+ non-zerofill segment. */
+ if ((DARWIN_SECTION_ANCHORS && flag_section_anchors && size < BYTES_ZFILL)
+ || (size && size <= 2))
+ {
+ /* Put smaller objects in _static_data, where the section anchors system
+ can get them.
+ However, if they are zero-sized punt them to yet a different section
+ (that is not allowed to participate in anchoring). */
+ if (!size)
+ {
+ fputs ("\t.section\t__DATA,__zobj_bss\n", fp);
+ in_section = darwin_sections[zobj_bss_section];
+ size = 1;
+ }
+ else
+ {
+ fputs ("\t.static_data\n", fp);
+ in_section = darwin_sections[static_data_section];
+ }
+
+ if (l2align)
+ fprintf (fp, "\t.align\t%u\n", l2align);
+
+ assemble_name (fp, name);
+ fprintf (fp, ":\n\t.space\t"HOST_WIDE_INT_PRINT_UNSIGNED"\n", size);
+ }
+ else
+ {
+ /* When we are on a non-section anchor target, we can get zero-sized
+ items here. However, all we need to do is to bump them to one byte
+ and the section alignment will take care of the rest. */
+ char secnam[64];
+ unsigned int flags ;
+ snprintf (secnam, 64, "__DATA,__%sbss%u", ((size)?"":"zo_"),
+ (unsigned) l2align);
+ /* We can't anchor (yet, if ever) in zerofill sections, because we can't
+ switch to them and emit a label. */
+ flags = SECTION_BSS|SECTION_WRITE|SECTION_NO_ANCHOR;
+ in_section = get_section (secnam, flags, NULL);
+ fprintf (fp, "\t.zerofill %s,", secnam);
+ assemble_name (fp, name);
+ if (!size)
+ size = 1;
+
+ if (l2align)
+ fprintf (fp, ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n",
+ size, (unsigned) l2align);
+ else
+ fprintf (fp, ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", size);
+ }
+
+ (*targetm.encode_section_info) (decl, DECL_RTL (decl), false);
+ /* This is defined as a file-scope var, so we know to notify machopic. */
+ machopic_define_symbol (DECL_RTL (decl));
+}
+
+/* Emit a chunk of common. */
+static void
+darwin_emit_common (FILE *fp, const char *name,
+ unsigned HOST_WIDE_INT size, unsigned int align)
+{
+ unsigned HOST_WIDE_INT rounded;
+ unsigned int l2align;
+
+ /* Earlier systems complain if the alignment exceeds the page size.
+ The magic number is 4096 * 8 - hard-coded for legacy systems. */
+ if (!emit_aligned_common && (align > 32768UL))
+ align = 4096UL; /* In units. */
+ else
+ align /= BITS_PER_UNIT;
+
+ /* Make sure we have a meaningful align. */
+ if (!align)
+ align = 1;
+
+ /* For earlier toolchains, we need to emit the var as a rounded size to
+ tell ld the alignment. */
+ if (size < align)
+ rounded = align;
+ else
+ rounded = (size + (align-1)) & ~(align-1);
+
+ l2align = floor_log2 (align);
+ gcc_assert (l2align <= L2_MAX_OFILE_ALIGNMENT);
+
+ in_section = comm_section;
+ /* We mustn't allow multiple public symbols to share an address when using
+ the normal OSX toolchain. */
+ if (!size)
+ {
+ /* Put at least one byte. */
+ size = 1;
+ /* This section can no longer participate in section anchoring. */
+ comm_section->common.flags |= SECTION_NO_ANCHOR;
+ }
+
+ fputs ("\t.comm\t", fp);
+ assemble_name (fp, name);
+ fprintf (fp, "," HOST_WIDE_INT_PRINT_UNSIGNED,
+ emit_aligned_common?size:rounded);
+ if (l2align && emit_aligned_common)
+ fprintf (fp, ",%u", l2align);
+ fputs ("\n", fp);
+}
+
+/* Output a var which is all zero - into aligned BSS sections, common, lcomm
+ or coalescable data sections (for weak or comdat) as appropriate. */
+
+void
+darwin_output_aligned_bss (FILE *fp, tree decl, const char *name,
+ unsigned HOST_WIDE_INT size, unsigned int align)
+{
+ unsigned int l2align;
+ bool one, pub, weak;
+ tree meta;
+
+ pub = TREE_PUBLIC (decl);
+ one = DECL_ONE_ONLY (decl);
+ weak = (DECL_P (decl)
+ && DECL_WEAK (decl)
+ && !lookup_attribute ("weak_import",
+ DECL_ATTRIBUTES (decl)));
+
+#ifdef DEBUG_DARWIN_MEM_ALLOCATORS
+fprintf (fp, "# albss: %s (%lld,%d) ro %d cst %d stat %d com %d"
+ " pub %d weak %d one %d init %lx\n",
+ name, (long long)size, (int)align, TREE_READONLY (decl),
+ TREE_CONSTANT (decl), TREE_STATIC (decl), DECL_COMMON (decl),
+ pub, weak, one, (unsigned long)DECL_INITIAL (decl));
+#endif
+
+ /* ObjC metadata can get put in BSS because varasm.c decides it's BSS
+ before the target has a chance to comment. */
+ if ((meta = is_objc_metadata (decl)))
+ {
+ darwin_emit_objc_zeroed (fp, decl, name, size, DECL_ALIGN (decl), meta);
+ return;
+ }
+
+ /* Check that any initializer is valid. */
+ gcc_assert ((DECL_INITIAL (decl) == NULL)
+ || (DECL_INITIAL (decl) == error_mark_node)
+ || initializer_zerop (DECL_INITIAL (decl)));
+
+ gcc_assert (DECL_SECTION_NAME (decl) == NULL);
+ gcc_assert (!DECL_COMMON (decl));
+
+ /* Pick up the correct alignment. */
+ if (!size || !align)
+ align = DECL_ALIGN (decl);
+
+ l2align = floor_log2 (align / BITS_PER_UNIT);
+ gcc_assert (l2align <= L2_MAX_OFILE_ALIGNMENT);
+
+ last_assemble_variable_decl = decl;
+
+ /* We would rather not have to check this here - but it seems that we might
+ be passed a decl that should be in coalesced space. */
+ if (one || weak)
+ {
+ /* Weak or COMDAT objects are put in mergeable sections. */
+ darwin_emit_weak_or_comdat (fp, decl, name, size,
+ DECL_ALIGN (decl));
+ return;
+ }
+
+ /* If this is not public, then emit according to local rules. */
+ if (!pub)
+ {
+ darwin_emit_local_bss (fp, decl, name, size, l2align);
+ return;
+ }
+
+ /* So we have a public symbol (small item fudge for Java, see above). */
+ if ((DARWIN_SECTION_ANCHORS && flag_section_anchors && size < BYTES_ZFILL)
+ || (size && size <= 2))
+ {
+ /* Put smaller objects in data, where the section anchors system can get
+ them. However, if they are zero-sized punt them to yet a different
+ section (that is not allowed to participate in anchoring). */
+ if (!size)
+ {
+ fputs ("\t.section\t__DATA,__zobj_data\n", fp);
+ in_section = darwin_sections[zobj_data_section];
+ size = 1;
+ }
+ else
+ {
+ fputs ("\t.data\n", fp);
+ in_section = data_section;
+ }
+
+ if (l2align)
+ fprintf (fp, "\t.align\t%u\n", l2align);
+
+ assemble_name (fp, name);
+ fprintf (fp, ":\n\t.space\t"HOST_WIDE_INT_PRINT_UNSIGNED"\n", size);
+ }
+ else
+ {
+ char secnam[64];
+ unsigned int flags ;
+ /* When we are on a non-section anchor target, we can get zero-sized
+ items here. However, all we need to do is to bump them to one byte
+ and the section alignment will take care of the rest. */
+ snprintf (secnam, 64, "__DATA,__%spu_bss%u", ((size)?"":"zo_"), l2align);
+
+ /* We can't anchor in zerofill sections, because we can't switch
+ to them and emit a label. */
+ flags = SECTION_BSS|SECTION_WRITE|SECTION_NO_ANCHOR;
+ in_section = get_section (secnam, flags, NULL);
+ fprintf (fp, "\t.zerofill %s,", secnam);
+ assemble_name (fp, name);
+ if (!size)
+ size = 1;
+
+ if (l2align)
+ fprintf (fp, ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", size, l2align);
+ else
+ fprintf (fp, ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", size);
+ }
+ (* targetm.encode_section_info) (decl, DECL_RTL (decl), false);
+}
+
+/* Output a chunk of common, with alignment specified (where the target
+ supports this). */
+void
+darwin_asm_output_aligned_decl_common (FILE *fp, tree decl, const char *name,
+ unsigned HOST_WIDE_INT size,
+ unsigned int align)
+{
+ unsigned int l2align;
+ bool one, weak;
+ tree meta;
+
+ /* No corresponding var. */
+ if (decl==NULL)
+ {
+#ifdef DEBUG_DARWIN_MEM_ALLOCATORS
+fprintf (fp, "# adcom: %s (%d,%d) decl=0x0\n", name, (int)size, (int)align);
+#endif
+ darwin_emit_common (fp, name, size, align);
+ return;
+ }
+
+ one = DECL_ONE_ONLY (decl);
+ weak = (DECL_P (decl)
+ && DECL_WEAK (decl)
+ && !lookup_attribute ("weak_import",
+ DECL_ATTRIBUTES (decl)));
+
+#ifdef DEBUG_DARWIN_MEM_ALLOCATORS
+fprintf (fp, "# adcom: %s (%lld,%d) ro %d cst %d stat %d com %d pub %d"
+ " weak %d one %d init %lx\n",
+ name, (long long)size, (int)align, TREE_READONLY (decl),
+ TREE_CONSTANT (decl), TREE_STATIC (decl), DECL_COMMON (decl),
+ TREE_PUBLIC (decl), weak, one, (unsigned long)DECL_INITIAL (decl));
+#endif
+
+ /* ObjC metadata can get put in BSS because varasm.c decides it's BSS
+ before the target has a chance to comment. */
+ if ((meta = is_objc_metadata (decl)))
+ {
+ darwin_emit_objc_zeroed (fp, decl, name, size, DECL_ALIGN (decl), meta);
+ return;
+ }
+
+ /* We shouldn't be messing with this if the decl has a section name. */
+ gcc_assert (DECL_SECTION_NAME (decl) == NULL);
+
+ /* We would rather not have to check this here - but it seems that we might
+ be passed a decl that should be in coalesced space. */
+ if (one || weak)
+ {
+ /* Weak or COMDAT objects are put in mergable sections. */
+ darwin_emit_weak_or_comdat (fp, decl, name, size,
+ DECL_ALIGN (decl));
+ return;
+ }
+
+ /* We should only get here for DECL_COMMON, with a zero init (and, in
+ principle, only for public symbols too - although we deal with local
+ ones below). */
+
+ /* Check the initializer is OK. */
+ gcc_assert (DECL_COMMON (decl)
+ && ((DECL_INITIAL (decl) == NULL)
+ || (DECL_INITIAL (decl) == error_mark_node)
+ || initializer_zerop (DECL_INITIAL (decl))));
+
+ last_assemble_variable_decl = decl;
+
+ if (!size || !align)
+ align = DECL_ALIGN (decl);
+
+ l2align = floor_log2 (align / BITS_PER_UNIT);
+ /* Check we aren't asking for more aligment than the platform allows. */
+ gcc_assert (l2align <= L2_MAX_OFILE_ALIGNMENT);
+
+ if (TREE_PUBLIC (decl) != 0)
+ darwin_emit_common (fp, name, size, align);
+ else
+ darwin_emit_local_bss (fp, decl, name, size, l2align);
+}
+
+/* Output a chunk of BSS with alignment specfied. */
+void
+darwin_asm_output_aligned_decl_local (FILE *fp, tree decl, const char *name,
+ unsigned HOST_WIDE_INT size,
+ unsigned int align)
+{
+ unsigned long l2align;
+ bool one, weak;
+ tree meta;
+
+ one = DECL_ONE_ONLY (decl);
+ weak = (DECL_P (decl)
+ && DECL_WEAK (decl)
+ && !lookup_attribute ("weak_import",
+ DECL_ATTRIBUTES (decl)));
+
+#ifdef DEBUG_DARWIN_MEM_ALLOCATORS
+fprintf (fp, "# adloc: %s (%lld,%d) ro %d cst %d stat %d one %d pub %d"
+ " weak %d init %lx\n",
+ name, (long long)size, (int)align, TREE_READONLY (decl),
+ TREE_CONSTANT (decl), TREE_STATIC (decl), one, TREE_PUBLIC (decl),
+ weak , (unsigned long)DECL_INITIAL (decl));
+#endif
+
+ /* ObjC metadata can get put in BSS because varasm.c decides it's BSS
+ before the target has a chance to comment. */
+ if ((meta = is_objc_metadata (decl)))
+ {
+ darwin_emit_objc_zeroed (fp, decl, name, size, DECL_ALIGN (decl), meta);
+ return;
+ }
+
+ /* We shouldn't be messing with this if the decl has a section name. */
+ gcc_assert (DECL_SECTION_NAME (decl) == NULL);
+
+ /* We would rather not have to check this here - but it seems that we might
+ be passed a decl that should be in coalesced space. */
+ if (one || weak)
+ {
+ /* Weak or COMDAT objects are put in mergable sections. */
+ darwin_emit_weak_or_comdat (fp, decl, name, size,
+ DECL_ALIGN (decl));
+ return;
+ }
+
+ /* .. and it should be suitable for placement in local mem. */
+ gcc_assert(!TREE_PUBLIC (decl) && !DECL_COMMON (decl));
+ /* .. and any initializer must be all-zero. */
+ gcc_assert ((DECL_INITIAL (decl) == NULL)
+ || (DECL_INITIAL (decl) == error_mark_node)
+ || initializer_zerop (DECL_INITIAL (decl)));
+
+ last_assemble_variable_decl = decl;
+
+ if (!size || !align)
+ align = DECL_ALIGN (decl);
+
+ l2align = floor_log2 (align / BITS_PER_UNIT);
+ gcc_assert (l2align <= L2_MAX_OFILE_ALIGNMENT);
+
+ darwin_emit_local_bss (fp, decl, name, size, l2align);
+}
+
/* 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
"not supported in this configuration; ignored");
}
+/* VEC Used by darwin_asm_dwarf_section.
+ Maybe a hash tab would be better here - but the intention is that this is
+ a very short list (fewer than 16 items) and each entry should (ideally,
+ eventually) only be presented once.
+
+ A structure to hold a dwarf debug section used entry. */
+
+typedef struct GTY(()) dwarf_sect_used_entry {
+ const char *name;
+ unsigned count;
+}
+dwarf_sect_used_entry;
+
+DEF_VEC_O(dwarf_sect_used_entry);
+DEF_VEC_ALLOC_O(dwarf_sect_used_entry, gc);
+
+/* A list of used __DWARF sections. */
+static GTY (()) VEC (dwarf_sect_used_entry, gc) * dwarf_sect_names_table;
+
+/* This is called when we are asked to assemble a named section and the
+ name begins with __DWARF,. We keep a list of the section names (without
+ the __DWARF, prefix) and use this to emit our required start label on the
+ first switch to each section. */
+
+static void
+darwin_asm_dwarf_section (const char *name, unsigned int flags,
+ tree ARG_UNUSED (decl))
+{
+ unsigned i;
+ int namelen;
+ const char * sname;
+ dwarf_sect_used_entry *ref;
+ bool found = false;
+ gcc_assert ((flags & (SECTION_DEBUG | SECTION_NAMED))
+ == (SECTION_DEBUG | SECTION_NAMED));
+ /* We know that the name starts with __DWARF, */
+ sname = name + 8;
+ namelen = strchr (sname, ',') - sname;
+ gcc_assert (namelen);
+ if (dwarf_sect_names_table == NULL)
+ dwarf_sect_names_table = VEC_alloc (dwarf_sect_used_entry, gc, 16);
+ else
+ for (i = 0;
+ VEC_iterate (dwarf_sect_used_entry, dwarf_sect_names_table, i, ref);
+ i++)
+ {
+ if (!ref)
+ break;
+ if (!strcmp (ref->name, sname))
+ {
+ found = true;
+ ref->count++;
+ break;
+ }
+ }
+
+ fprintf (asm_out_file, "\t.section %s\n", name);
+ if (!found)
+ {
+ dwarf_sect_used_entry e;
+ fprintf (asm_out_file, "Lsection%.*s:\n", namelen, sname);
+ e.count = 1;
+ e.name = xstrdup (sname);
+ VEC_safe_push (dwarf_sect_used_entry, gc, dwarf_sect_names_table, &e);
+ }
+}
+
/* Output a difference of two labels that will be an assembly time
constant if the two labels are local. (.long lab1-lab2 will be
very different if lab1 is at the boundary between two sections; it
fprintf (file, "\t.set L$set$%d,", darwin_dwarf_label_counter);
else
fprintf (file, "\t%s\t", directive);
+
assemble_name_raw (file, lab1);
fprintf (file, "-");
assemble_name_raw (file, lab2);
fprintf (file, "\n\t%s L$set$%d", directive, darwin_dwarf_label_counter++);
}
-/* Output labels for the start of the DWARF sections if necessary.
- Initialize the stuff we need for LTO long section names support. */
-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_PUBTYPES_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);
- }
- }
-
- /* We fill this obstack with the complete section text for the lto section
- names to write in darwin_file_end. */
- obstack_init (<o_section_names_obstack);
- lto_section_names_offset = 0;
-}
-
/* 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
darwin_asm_output_dwarf_delta (file, size, lab, sname);
}
+/* Called from the within the TARGET_ASM_FILE_START for each target. */
+
void
-darwin_file_end (void)
+darwin_file_start (void)
{
- const char *lto_section_names;
+ /* Nothing to do. */
+}
+
+/* Called for the TARGET_ASM_FILE_END hook.
+ Emit the mach-o pic indirection data, the lto data and, finally a flag
+ to tell the linker that it can break the file object into sections and
+ move those around for efficiency. */
+void
+darwin_file_end (void)
+{
machopic_finish (asm_out_file);
if (strcmp (lang_hooks.name, "GNU C++") == 0)
{
lto_asm_txt = buf = (char *) xmalloc (n + 1);
while (fgets (lto_asm_txt, n, lto_asm_out_file))
fputs (lto_asm_txt, asm_out_file);
+ /* Put a termination label. */
+ fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n",
+ LTO_SEGMENT_NAME, LTO_SECTS_SECTION);
+ fprintf (asm_out_file, "L_GNU_LTO%d:\t;# end of lto\n",
+ lto_section_num);
+ /* Make sure our termination label stays in this section. */
+ fputs ("\t.space\t1\n", asm_out_file);
}
/* Remove the temporary file. */
free (lto_asm_out_name);
}
- /* Finish the LTO section names obstack. Don't output anything if
- there are no recorded section names. */
- obstack_1grow (<o_section_names_obstack, '\0');
- lto_section_names = XOBFINISH (<o_section_names_obstack, const char *);
- if (strlen (lto_section_names) > 0)
+ /* Output the names and indices. */
+ if (lto_section_names && VEC_length (darwin_lto_section_e, lto_section_names))
{
- fprintf (asm_out_file,
- "\t.section %s,%s,regular,debug\n",
+ int count;
+ darwin_lto_section_e *ref;
+ /* For now, we'll make the offsets 4 bytes and unaligned - we'll fix
+ the latter up ourselves. */
+ const char *op = integer_asm_op (4,0);
+
+ /* Emit the names. */
+ fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n",
LTO_SEGMENT_NAME, LTO_NAMES_SECTION);
- fprintf (asm_out_file,
- "\t# Section names in %s are offsets into this table\n",
- LTO_SEGMENT_NAME);
- fprintf (asm_out_file, "%s\n", lto_section_names);
+ FOR_EACH_VEC_ELT (darwin_lto_section_e, lto_section_names, count, ref)
+ {
+ fprintf (asm_out_file, "L_GNU_LTO_NAME%d:\n", count);
+ /* We have to jump through hoops to get the values of the intra-section
+ offsets... */
+ fprintf (asm_out_file,
+ "\t.set L$gnu$lto$noff%d,L_GNU_LTO_NAME%d-L_GNU_LTO_NAME0\n",
+ count, count);
+ fprintf (asm_out_file,
+ "\t.set L$gnu$lto$nsiz%d,L_GNU_LTO_NAME%d-L_GNU_LTO_NAME%d\n",
+ count, count+1, count);
+ fprintf (asm_out_file, "\t.asciz\t\"%s\"\n", ref->sectname);
+ }
+ fprintf (asm_out_file, "L_GNU_LTO_NAME%d:\t;# end\n", lto_section_num);
+ /* make sure our termination label stays in this section. */
+ fputs ("\t.space\t1\n", asm_out_file);
+
+ /* Emit the Index. */
+ fprintf (asm_out_file, "\t.section %s,%s,regular,debug\n",
+ LTO_SEGMENT_NAME, LTO_INDEX_SECTION);
+ fputs ("\t.align\t2\n", asm_out_file);
+ fputs ("# Section offset, Section length, Name offset, Name length\n",
+ asm_out_file);
+ FOR_EACH_VEC_ELT (darwin_lto_section_e, lto_section_names, count, ref)
+ {
+ fprintf (asm_out_file, "%s L$gnu$lto$offs%d\t;# %s\n",
+ op, count, ref->sectname);
+ fprintf (asm_out_file, "%s L$gnu$lto$size%d\n", op, count);
+ fprintf (asm_out_file, "%s L$gnu$lto$noff%d\n", op, count);
+ fprintf (asm_out_file, "%s L$gnu$lto$nsiz%d\n", op, count);
+ }
}
- obstack_free (<o_section_names_obstack, NULL);
- fprintf (asm_out_file, "\t.subsections_via_symbols\n");
+ /* If we have section anchors, then we must prevent the linker from
+ re-arranging data. */
+ if (!DARWIN_SECTION_ANCHORS || !flag_section_anchors)
+ fprintf (asm_out_file, "\t.subsections_via_symbols\n");
}
/* TODO: Add a language hook for identifying if a decl is a vtable. */
TARGET_KEXTABI && DARWIN_VTABLE_P (decl));
}
-#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, ", . + " HOST_WIDE_INT_PRINT_DEC "\n",
SYMBOL_REF_BLOCK_OFFSET (symbol));
}
-#endif
+
+/* Disable section anchoring on any section containing a zero-sized
+ object. */
+bool
+darwin_use_anchors_for_symbol_p (const_rtx symbol)
+{
+ if (DARWIN_SECTION_ANCHORS && flag_section_anchors)
+ {
+ section *sect;
+ /* If the section contains a zero-sized object it's ineligible. */
+ sect = SYMBOL_REF_BLOCK (symbol)->sect;
+ /* This should have the effect of disabling anchors for vars that follow
+ any zero-sized one, in a given section. */
+ if (sect->common.flags & SECTION_NO_ANCHOR)
+ return false;
+
+ /* Also check the normal reasons for suppressing. */
+ return default_use_anchors_for_symbol_p (symbol);
+ }
+ else
+ return false;
+}
/* Set the darwin specific attributes on TYPE. */
void
void
darwin_override_options (void)
{
+ /* Keep track of which (major) version we're generating code for. */
+ if (darwin_macosx_version_min)
+ {
+ if (strverscmp (darwin_macosx_version_min, "10.6") >= 0)
+ generating_for_darwin_version = 10;
+ else if (strverscmp (darwin_macosx_version_min, "10.5") >= 0)
+ generating_for_darwin_version = 9;
+
+ /* Earlier versions are not specifically accounted, until required. */
+ }
+
+ /* In principle, this should be c-family only. However, we really need to
+ set sensible defaults for LTO as well, since the section selection stuff
+ should check for correctness re. the ABI. TODO: check and provide the
+ flags (runtime & ABI) from the lto wrapper). */
+
+ /* Unless set, force ABI=2 for NeXT and m64, 0 otherwise. */
+ if (!global_options_set.x_flag_objc_abi)
+ global_options.x_flag_objc_abi
+ = (!flag_next_runtime)
+ ? 0
+ : (TARGET_64BIT ? 2
+ : (generating_for_darwin_version >= 9) ? 1
+ : 0);
+
+ /* Objective-C family ABI 2 is only valid for next/m64 at present. */
+ if (global_options_set.x_flag_objc_abi && flag_next_runtime)
+ {
+ if (TARGET_64BIT && global_options.x_flag_objc_abi < 2)
+ error_at (UNKNOWN_LOCATION, "%<-fobjc-abi-version%> >= 2 must be"
+ " used for %<-m64%> targets with"
+ " %<-fnext-runtime%>");
+ if (!TARGET_64BIT && global_options.x_flag_objc_abi >= 2)
+ error_at (UNKNOWN_LOCATION, "%<-fobjc-abi-version%> >= 2 is not"
+ " supported on %<-m32%> targets with"
+ " %<-fnext-runtime%>");
+ }
+
/* Don't emit DWARF3/4 unless specifically selected. This is a
workaround for tool bugs. */
- if (dwarf_strict < 0)
+ if (!global_options_set.x_dwarf_strict)
dwarf_strict = 1;
- /* Disable -freorder-blocks-and-partition for darwin_emit_unwind_label. */
- if (flag_reorder_blocks_and_partition
- && (targetm.asm_out.unwind_label == darwin_emit_unwind_label))
+ /* Do not allow unwind tables to be generated by default for m32.
+ fnon-call-exceptions will override this, regardless of what we do. */
+ if (generating_for_darwin_version < 10
+ && !global_options_set.x_flag_asynchronous_unwind_tables
+ && !TARGET_64BIT)
+ global_options.x_flag_asynchronous_unwind_tables = 0;
+
+ /* Disable -freorder-blocks-and-partition when unwind tables are being
+ emitted for Darwin < 9 (OSX 10.5).
+ The strategy is, "Unless the User has specifically set/unset an unwind
+ flag we will switch off -freorder-blocks-and-partition when unwind tables
+ will be generated". If the User specifically sets flags... we assume
+ (s)he knows why... */
+ if (generating_for_darwin_version < 9
+ && global_options_set.x_flag_reorder_blocks_and_partition
+ && ((global_options.x_flag_exceptions /* User, c++, java */
+ && !global_options_set.x_flag_exceptions) /* User specified... */
+ || (global_options.x_flag_unwind_tables
+ && !global_options_set.x_flag_unwind_tables)
+ || (global_options.x_flag_non_call_exceptions
+ && !global_options_set.x_flag_non_call_exceptions)
+ || (global_options.x_flag_asynchronous_unwind_tables
+ && !global_options_set.x_flag_asynchronous_unwind_tables)))
{
inform (input_location,
- "-freorder-blocks-and-partition does not work with exceptions "
- "on this architecture");
+ "-freorder-blocks-and-partition does not work with exceptions "
+ "on this architecture");
flag_reorder_blocks_and_partition = 0;
flag_reorder_blocks = 1;
}
flag_exceptions = 0;
/* No -fnon-call-exceptions data in kexts. */
flag_non_call_exceptions = 0;
+ /* so no tables either.. */
+ flag_unwind_tables = 0;
+ flag_asynchronous_unwind_tables = 0;
+ /* We still need to emit branch islands for kernel context. */
+ darwin_emit_branch_islands = true;
}
+
if (flag_var_tracking
- && strverscmp (darwin_macosx_version_min, "10.5") >= 0
- && debug_info_level >= DINFO_LEVEL_NORMAL
- && debug_hooks->var_location != do_nothing_debug_hooks.var_location)
+ && generating_for_darwin_version >= 9
+ && (flag_gtoggle ? (debug_info_level == DINFO_LEVEL_NONE)
+ : (debug_info_level >= DINFO_LEVEL_NORMAL))
+ && write_symbols == DWARF2_DEBUG)
flag_var_tracking_uninit = 1;
+
+ if (MACHO_DYNAMIC_NO_PIC_P)
+ {
+ if (flag_pic)
+ warning_at (UNKNOWN_LOCATION, 0,
+ "%<-mdynamic-no-pic%> overrides %<-fpic%>, %<-fPIC%>,"
+ " %<-fpie%> or %<-fPIE%>");
+ flag_pic = 0;
+ }
+ else if (flag_pic == 1)
+ {
+ /* Darwin's -fpic is -fPIC. */
+ flag_pic = 2;
+ }
+
+ /* It is assumed that branch island stubs are needed for earlier systems. */
+ if (generating_for_darwin_version < 9)
+ darwin_emit_branch_islands = true;
+ else
+ emit_aligned_common = true; /* Later systems can support aligned common. */
+
+ /* The c_dialect...() macros are not available to us here. */
+ darwin_running_cxx = (strstr (lang_hooks.name, "C++") != 0);
}
-/* Add $LDBL128 suffix to long double builtins. */
+#if DARWIN_PPC
+/* Add $LDBL128 suffix to long double builtins for ppc darwin. */
static void
-darwin_patch_builtin (int fncode)
+darwin_patch_builtin (enum built_in_function fncode)
{
- tree fn = built_in_decls[fncode];
+ tree fn = builtin_decl_explicit (fncode);
tree sym;
char *newname;
set_user_assembler_name (fn, newname);
- fn = implicit_built_in_decls[fncode];
+ fn = builtin_decl_implicit (fncode);
if (fn)
set_user_assembler_name (fn, newname);
}
#undef PATCH_BUILTIN_NO64
#undef PATCH_BUILTIN_VARIADIC
}
+#endif
+
+/* CFStrings implementation. */
+static GTY(()) tree cfstring_class_reference = NULL_TREE;
+static GTY(()) tree cfstring_type_node = NULL_TREE;
+static GTY(()) tree ccfstring_type_node = NULL_TREE;
+static GTY(()) tree pccfstring_type_node = NULL_TREE;
+static GTY(()) tree pcint_type_node = NULL_TREE;
+static GTY(()) tree pcchar_type_node = NULL_TREE;
+
+static enum built_in_function darwin_builtin_cfstring;
+
+/* Store all constructed constant CFStrings in a hash table so that
+ they get uniqued properly. */
+
+typedef struct GTY (()) cfstring_descriptor {
+ /* The string literal. */
+ tree literal;
+ /* The resulting constant CFString. */
+ tree constructor;
+} cfstring_descriptor;
+
+static GTY ((param_is (struct cfstring_descriptor))) htab_t cfstring_htab;
+
+static hashval_t cfstring_hash (const void *);
+static int cfstring_eq (const void *, const void *);
+
+static tree
+add_builtin_field_decl (tree type, const char *name, tree **chain)
+{
+ tree field = build_decl (BUILTINS_LOCATION, FIELD_DECL,
+ get_identifier (name), type);
+
+ if (*chain != NULL)
+ **chain = field;
+ *chain = &DECL_CHAIN (field);
+
+ return field;
+}
+
+tree
+darwin_init_cfstring_builtins (unsigned builtin_cfstring)
+{
+ tree cfsfun, fields, pccfstring_ftype_pcchar;
+ tree *chain = NULL;
+
+ darwin_builtin_cfstring =
+ (enum built_in_function) builtin_cfstring;
+
+ /* struct __builtin_CFString {
+ const int *isa; (will point at
+ int flags; __CFConstantStringClassReference)
+ const char *str;
+ long length;
+ }; */
+
+ pcint_type_node = build_pointer_type
+ (build_qualified_type (integer_type_node, TYPE_QUAL_CONST));
+
+ pcchar_type_node = build_pointer_type
+ (build_qualified_type (char_type_node, TYPE_QUAL_CONST));
+
+ cfstring_type_node = (*lang_hooks.types.make_type) (RECORD_TYPE);
+
+ /* Have to build backwards for finish struct. */
+ fields = add_builtin_field_decl (long_integer_type_node, "length", &chain);
+ add_builtin_field_decl (pcchar_type_node, "str", &chain);
+ add_builtin_field_decl (integer_type_node, "flags", &chain);
+ add_builtin_field_decl (pcint_type_node, "isa", &chain);
+ finish_builtin_struct (cfstring_type_node, "__builtin_CFString",
+ fields, NULL_TREE);
+
+ /* const struct __builtin_CFstring *
+ __builtin___CFStringMakeConstantString (const char *); */
+
+ ccfstring_type_node = build_qualified_type
+ (cfstring_type_node, TYPE_QUAL_CONST);
+ pccfstring_type_node = build_pointer_type (ccfstring_type_node);
+ pccfstring_ftype_pcchar = build_function_type_list
+ (pccfstring_type_node, pcchar_type_node, NULL_TREE);
+
+ cfsfun = build_decl (BUILTINS_LOCATION, FUNCTION_DECL,
+ get_identifier ("__builtin___CFStringMakeConstantString"),
+ pccfstring_ftype_pcchar);
+
+ TREE_PUBLIC (cfsfun) = 1;
+ DECL_EXTERNAL (cfsfun) = 1;
+ DECL_ARTIFICIAL (cfsfun) = 1;
+ /* Make a lang-specific section - dup_lang_specific_decl makes a new node
+ in place of the existing, which may be NULL. */
+ DECL_LANG_SPECIFIC (cfsfun) = NULL;
+ (*lang_hooks.dup_lang_specific_decl) (cfsfun);
+ DECL_BUILT_IN_CLASS (cfsfun) = BUILT_IN_MD;
+ DECL_FUNCTION_CODE (cfsfun) = darwin_builtin_cfstring;
+ lang_hooks.builtin_function (cfsfun);
+
+ /* extern int __CFConstantStringClassReference[]; */
+ cfstring_class_reference = build_decl (BUILTINS_LOCATION, VAR_DECL,
+ get_identifier ("__CFConstantStringClassReference"),
+ build_array_type (integer_type_node, NULL_TREE));
+
+ TREE_PUBLIC (cfstring_class_reference) = 1;
+ DECL_ARTIFICIAL (cfstring_class_reference) = 1;
+ (*lang_hooks.decls.pushdecl) (cfstring_class_reference);
+ DECL_EXTERNAL (cfstring_class_reference) = 1;
+ rest_of_decl_compilation (cfstring_class_reference, 0, 0);
+
+ /* Initialize the hash table used to hold the constant CFString objects. */
+ cfstring_htab = htab_create_ggc (31, cfstring_hash, cfstring_eq, NULL);
+
+ return cfstring_type_node;
+}
+
+tree
+darwin_fold_builtin (tree fndecl, int n_args, tree *argp,
+ bool ARG_UNUSED (ignore))
+{
+ unsigned int fcode = DECL_FUNCTION_CODE (fndecl);
+
+ if (fcode == darwin_builtin_cfstring)
+ {
+ if (!darwin_constant_cfstrings)
+ {
+ error ("built-in function %qD requires the"
+ " %<-mconstant-cfstrings%> flag", fndecl);
+ return error_mark_node;
+ }
+
+ if (n_args != 1)
+ {
+ error ("built-in function %qD takes one argument only", fndecl);
+ return error_mark_node;
+ }
+
+ return darwin_build_constant_cfstring (*argp);
+ }
+
+ return NULL_TREE;
+}
+
+void
+darwin_rename_builtins (void)
+{
+ /* The system ___divdc3 routine in libSystem on darwin10 is not
+ accurate to 1ulp, ours is, so we avoid ever using the system name
+ for this routine and instead install a non-conflicting name that
+ is accurate.
+
+ When -ffast-math or -funsafe-math-optimizations is given, we can
+ use the faster version. */
+ if (!flag_unsafe_math_optimizations)
+ {
+ enum built_in_function dcode
+ = (enum built_in_function)(BUILT_IN_COMPLEX_DIV_MIN
+ + DCmode - MIN_MODE_COMPLEX_FLOAT);
+ tree fn = builtin_decl_explicit (dcode);
+ /* Fortran and c call TARGET_INIT_BUILTINS and
+ TARGET_INIT_LIBFUNCS at different times, so we have to put a
+ call into each to ensure that at least one of them is called
+ after build_common_builtin_nodes. A better fix is to add a
+ new hook to run after build_common_builtin_nodes runs. */
+ if (fn)
+ set_user_assembler_name (fn, "___ieee_divdc3");
+ fn = builtin_decl_implicit (dcode);
+ if (fn)
+ set_user_assembler_name (fn, "___ieee_divdc3");
+ }
+}
+
+static hashval_t
+cfstring_hash (const void *ptr)
+{
+ tree str = ((const struct cfstring_descriptor *)ptr)->literal;
+ const unsigned char *p = (const unsigned char *) TREE_STRING_POINTER (str);
+ int i, len = TREE_STRING_LENGTH (str);
+ hashval_t h = len;
+
+ for (i = 0; i < len; i++)
+ h = ((h * 613) + p[i]);
+
+ return h;
+}
+static int
+cfstring_eq (const void *ptr1, const void *ptr2)
+{
+ tree str1 = ((const struct cfstring_descriptor *)ptr1)->literal;
+ tree str2 = ((const struct cfstring_descriptor *)ptr2)->literal;
+ int len1 = TREE_STRING_LENGTH (str1);
+
+ return (len1 == TREE_STRING_LENGTH (str2)
+ && !memcmp (TREE_STRING_POINTER (str1), TREE_STRING_POINTER (str2),
+ len1));
+}
+
+tree
+darwin_build_constant_cfstring (tree str)
+{
+ struct cfstring_descriptor *desc, key;
+ void **loc;
+ tree addr;
+
+ if (!str)
+ {
+ error ("CFString literal is missing");
+ return error_mark_node;
+ }
+
+ STRIP_NOPS (str);
+
+ if (TREE_CODE (str) == ADDR_EXPR)
+ str = TREE_OPERAND (str, 0);
+
+ if (TREE_CODE (str) != STRING_CST)
+ {
+ error ("CFString literal expression is not a string constant");
+ return error_mark_node;
+ }
+
+ /* Perhaps we already constructed a constant CFString just like this one? */
+ key.literal = str;
+ loc = htab_find_slot (cfstring_htab, &key, INSERT);
+ desc = (struct cfstring_descriptor *) *loc;
+
+ if (!desc)
+ {
+ tree var, constructor, field;
+ VEC(constructor_elt,gc) *v = NULL;
+ int length = TREE_STRING_LENGTH (str) - 1;
+
+ if (darwin_warn_nonportable_cfstrings)
+ {
+ const char *s = TREE_STRING_POINTER (str);
+ int l = 0;
+
+ for (l = 0; l < length; l++)
+ if (!s[l] || !isascii (s[l]))
+ {
+ warning (darwin_warn_nonportable_cfstrings, "%s in CFString literal",
+ s[l] ? "non-ASCII character" : "embedded NUL");
+ break;
+ }
+ }
+
+ *loc = desc = ggc_alloc_cleared_cfstring_descriptor ();
+ desc->literal = str;
+
+ /* isa *. */
+ field = TYPE_FIELDS (ccfstring_type_node);
+ CONSTRUCTOR_APPEND_ELT(v, NULL_TREE,
+ build1 (ADDR_EXPR, TREE_TYPE (field),
+ cfstring_class_reference));
+ /* flags */
+ field = DECL_CHAIN (field);
+ CONSTRUCTOR_APPEND_ELT(v, NULL_TREE,
+ build_int_cst (TREE_TYPE (field), 0x000007c8));
+ /* string *. */
+ field = DECL_CHAIN (field);
+ CONSTRUCTOR_APPEND_ELT(v, NULL_TREE,
+ build1 (ADDR_EXPR, TREE_TYPE (field), str));
+ /* length */
+ field = DECL_CHAIN (field);
+ CONSTRUCTOR_APPEND_ELT(v, NULL_TREE,
+ build_int_cst (TREE_TYPE (field), length));
+
+ constructor = build_constructor (ccfstring_type_node, v);
+ TREE_READONLY (constructor) = 1;
+ TREE_CONSTANT (constructor) = 1;
+ TREE_STATIC (constructor) = 1;
+
+ /* Fromage: The C++ flavor of 'build_unary_op' expects constructor nodes
+ to have the TREE_HAS_CONSTRUCTOR (...) bit set. However, this file is
+ being built without any knowledge of C++ tree accessors; hence, we shall
+ use the generic accessor that TREE_HAS_CONSTRUCTOR actually maps to! */
+ if (darwin_running_cxx)
+ TREE_LANG_FLAG_4 (constructor) = 1; /* TREE_HAS_CONSTRUCTOR */
+
+ /* Create an anonymous global variable for this CFString. */
+ var = build_decl (input_location, CONST_DECL,
+ NULL, TREE_TYPE (constructor));
+ DECL_ARTIFICIAL (var) = 1;
+ TREE_STATIC (var) = 1;
+ DECL_INITIAL (var) = constructor;
+ /* FIXME: This should use a translation_unit_decl to indicate file scope. */
+ DECL_CONTEXT (var) = NULL_TREE;
+ desc->constructor = var;
+ }
+
+ addr = build1 (ADDR_EXPR, pccfstring_type_node, desc->constructor);
+ TREE_CONSTANT (addr) = 1;
+
+ return addr;
+}
+
+bool
+darwin_cfstring_p (tree str)
+{
+ struct cfstring_descriptor key;
+ void **loc;
+
+ if (!str)
+ return false;
+
+ STRIP_NOPS (str);
+
+ if (TREE_CODE (str) == ADDR_EXPR)
+ str = TREE_OPERAND (str, 0);
+
+ if (TREE_CODE (str) != STRING_CST)
+ return false;
+
+ key.literal = str;
+ loc = htab_find_slot (cfstring_htab, &key, NO_INSERT);
+
+ if (loc)
+ return true;
+
+ return false;
+}
+
+void
+darwin_enter_string_into_cfstring_table (tree str)
+{
+ struct cfstring_descriptor key;
+ void **loc;
+
+ key.literal = str;
+ loc = htab_find_slot (cfstring_htab, &key, INSERT);
+
+ if (!*loc)
+ {
+ *loc = ggc_alloc_cleared_cfstring_descriptor ();
+ ((struct cfstring_descriptor *)*loc)->literal = str;
+ }
+}
+
+/* Choose named function section based on its frequency. */
+
+section *
+darwin_function_section (tree decl, enum node_frequency freq,
+ bool startup, bool exit)
+{
+ /* Decide if we need to put this in a coalescable section. */
+ bool weak = (decl
+ && DECL_WEAK (decl)
+ && (!DECL_ATTRIBUTES (decl)
+ || !lookup_attribute ("weak_import",
+ DECL_ATTRIBUTES (decl))));
+
+ /* If there is a specified section name, we should not be trying to
+ override. */
+ if (decl && DECL_SECTION_NAME (decl) != NULL_TREE)
+ return get_named_section (decl, NULL, 0);
+
+ /* Default when there is no function re-ordering. */
+ if (!flag_reorder_functions)
+ return (weak)
+ ? darwin_sections[text_coal_section]
+ : text_section;
+
+ /* Startup code should go to startup subsection unless it is
+ unlikely executed (this happens especially with function splitting
+ where we can split away unnecesary parts of static constructors). */
+ if (startup && freq != NODE_FREQUENCY_UNLIKELY_EXECUTED)
+ return (weak)
+ ? darwin_sections[text_startup_coal_section]
+ : darwin_sections[text_startup_section];
+
+ /* Similarly for exit. */
+ if (exit && freq != NODE_FREQUENCY_UNLIKELY_EXECUTED)
+ return (weak)
+ ? darwin_sections[text_exit_coal_section]
+ : darwin_sections[text_exit_section];
+
+ /* Group cold functions together, similarly for hot code. */
+ switch (freq)
+ {
+ case NODE_FREQUENCY_UNLIKELY_EXECUTED:
+ return (weak)
+ ? darwin_sections[text_cold_coal_section]
+ : darwin_sections[text_cold_section];
+ break;
+ case NODE_FREQUENCY_HOT:
+ return (weak)
+ ? darwin_sections[text_hot_coal_section]
+ : darwin_sections[text_hot_section];
+ break;
+ default:
+ return (weak)
+ ? darwin_sections[text_coal_section]
+ : text_section;
+ break;
+ }
+}
+
+/* When a function is partitioned between sections, we need to insert a label
+ at the start of each new chunk - so that it may become a valid 'atom' for
+ eh and debug purposes. Without this the linker will emit warnings if one
+ tries to add line location information (since the switched fragment will
+ be anonymous). */
+
+void
+darwin_function_switched_text_sections (FILE *fp, tree decl, bool new_is_cold)
+{
+ char buf[128];
+ snprintf (buf, 128, "%s%s",new_is_cold?"__cold_sect_of_":"__hot_sect_of_",
+ IDENTIFIER_POINTER (DECL_NAME (decl)));
+ /* Make sure we pick up all the relevant quotes etc. */
+ assemble_name_raw (fp, (const char *) buf);
+ fputs (":\n", fp);
+}
#include "gt-darwin.h"
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