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/gcc/gcc/config/i386/darwin.h

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/* Target definitions for x86 running Darwin.
   Copyright (C) 2001-2021 Free Software Foundation, Inc.
   Contributed by Apple Computer Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

/* Enable Mach-O bits in generic x86 code.  */
#undef TARGET_MACHO
#define TARGET_MACHO 1

#undef DARWIN_X86
#define DARWIN_X86 1

#undef TARGET_64BIT
#define TARGET_64BIT TARGET_ISA_64BIT
#undef TARGET_64BIT_P
#define TARGET_64BIT_P(x) TARGET_ISA_64BIT_P(x)

#ifdef IN_LIBGCC2
#undef TARGET_64BIT
#ifdef __x86_64__
#define TARGET_64BIT 1
#else
#define TARGET_64BIT 0
#endif
#endif

/* WORKAROUND pr80556:
   For x86_64 Darwin10 and later, the unwinder is in libunwind (redirected
   from libSystem).  This doesn't use the keymgr (see keymgr.c) and therefore
   the calls that libgcc makes to obtain the KEYMGR_GCC3_DW2_OBJ_LIST are not
   updated to include new images, and might not even be valid for a single
   image.
   Therefore, for 64b exes at least, we must use the libunwind implementation,
   even when static-libgcc is specified.  We put libSystem first so that
   unwinder symbols are satisfied from there.
   We default to 64b for single-arch builds, so apply this unconditionally. */
#undef REAL_LIBGCC_SPEC
#define REAL_LIBGCC_SPEC						   \
   "%{static-libgcc|static: 						   \
       %:version-compare(>= 10.6 mmacosx-version-min= -lSystem)		   \
       -lgcc_eh -lgcc;							   \
      shared-libgcc|fexceptions|fgnu-runtime:				   \
       %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4)	   \
       %:version-compare(>< 10.5 10.6 mmacosx-version-min= -lgcc_s.10.5)   \
       %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_ext.10.4)	   \
       %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_ext.10.5)	   \
       -lgcc ;								   \
      :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \
       %:version-compare(>< 10.5 10.6 mmacosx-version-min= -lgcc_s.10.5)   \
       %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_ext.10.4)	   \
       %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_ext.10.5)	   \
       -lgcc }"

/* Size of the Obj-C jump buffer.  */
#define OBJC_JBLEN ((TARGET_64BIT) ? ((9 * 2) + 3 + 16) : (18))

#undef TARGET_FPMATH_DEFAULT
#define TARGET_FPMATH_DEFAULT (TARGET_SSE ? FPMATH_SSE : FPMATH_387)
#undef TARGET_FPMATH_DEFAULT_P
#define TARGET_FPMATH_DEFAULT_P(x) \
  (TARGET_SSE_P(x) ? FPMATH_SSE : FPMATH_387)

#define TARGET_OS_CPP_BUILTINS()                \
  do {						\
    builtin_define ("__LITTLE_ENDIAN__");	\
    darwin_cpp_builtins (pfile);		\
  } while (0)

#undef PTRDIFF_TYPE
#define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")

#undef WCHAR_TYPE
#define WCHAR_TYPE "int"

#undef WCHAR_TYPE_SIZE
#define WCHAR_TYPE_SIZE 32

/* Generate pic symbol indirection stubs if this is true.  */
#undef TARGET_MACHO_SYMBOL_STUBS
#define TARGET_MACHO_SYMBOL_STUBS (darwin_symbol_stubs)

/* For compatibility with OSX system tools, use the new style of pic stub
   if this is set (default).  */
#undef  MACHOPIC_ATT_STUB
#define MACHOPIC_ATT_STUB (darwin_macho_att_stub)

#undef MAX_BITS_PER_WORD
#define MAX_BITS_PER_WORD 64

#undef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
#define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN (0)

#undef TARGET_KEEPS_VECTOR_ALIGNED_STACK
#define TARGET_KEEPS_VECTOR_ALIGNED_STACK 1

/* On Darwin, the stack is 128-bit aligned at the point of every call.
   Failure to ensure this will lead to a crash in the system libraries
   or dynamic loader.  */

#undef MAIN_STACK_BOUNDARY
#define MAIN_STACK_BOUNDARY 128

/* Since we'll never want a stack boundary less aligned than 128 bits
   we need the extra work here otherwise bits of gcc get very grumpy
   when we ask for lower alignment.  We could just reject values less
   than 128 bits for Darwin, but it's easier to up the alignment if
   it's below the minimum.  */
#undef PREFERRED_STACK_BOUNDARY
#define PREFERRED_STACK_BOUNDARY \
  MAX (128, ix86_preferred_stack_boundary)

/* We want -fPIC by default, unless we're using -static to compile for
   the kernel or some such.  */

#undef CC1_SPEC
#define CC1_SPEC "%(cc1_cpu) \
  %{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \
  %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} \
  %{mx32:%eDarwin is not an mx32 platform} \
  %{mfentry*:%eDarwin does not support -mfentry or associated options}" \
  DARWIN_CC1_SPEC

#undef ASM_SPEC
#define ASM_SPEC "-arch %(darwin_arch) \
  " ASM_OPTIONS " -force_cpusubtype_ALL \
  %{static}" ASM_MMACOSX_VERSION_MIN_SPEC

#undef ENDFILE_SPEC
#define ENDFILE_SPEC \
  "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
   %{mpc32:crtprec32.o%s} \
   %{mpc64:crtprec64.o%s} \
   %{mpc80:crtprec80.o%s}" TM_DESTRUCTOR

/* We default to x86_64 for single-arch builds, bi-arch overrides.  */
#define DARWIN_ARCH_SPEC "x86_64"

#undef SUBTARGET_EXTRA_SPECS
#define SUBTARGET_EXTRA_SPECS                                   \
  DARWIN_EXTRA_SPECS                                            \
  { "darwin_arch", DARWIN_ARCH_SPEC },				\
  { "darwin_crt2", "" },                                        \
  { "darwin_subarch", DARWIN_ARCH_SPEC },

/* The Darwin assembler mostly follows AT&T syntax.  */
#undef ASSEMBLER_DIALECT
#define ASSEMBLER_DIALECT ASM_ATT

/* Define macro used to output shift-double opcodes when the shift
   count is in %cl.  Some assemblers require %cl as an argument;
   some don't.  This macro controls what to do: by default, don't
   print %cl.  */

#define SHIFT_DOUBLE_OMITS_COUNT 0

#undef TARGET_ASM_FILE_END
#define TARGET_ASM_FILE_END darwin_file_end

/* Define the syntax of pseudo-ops, labels and comments.  */

/* String containing the assembler's comment-starter.  */

#define ASM_COMMENT_START "#"

/* By default, target has a 80387, uses IEEE compatible arithmetic,
   and returns float values in the 387.  */

#undef TARGET_SUBTARGET_DEFAULT
#define TARGET_SUBTARGET_DEFAULT \
  (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE)

/* For darwin we want to target specific processor features as a minimum,
   but these unfortunately don't correspond to a specific processor.  */
#undef TARGET_SUBTARGET32_ISA_DEFAULT
#define TARGET_SUBTARGET32_ISA_DEFAULT			\
  (OPTION_MASK_ISA_MMX | OPTION_MASK_ISA_SSE		\
   | OPTION_MASK_ISA_SSE2 | OPTION_MASK_ISA_SSE3)

#undef TARGET_SUBTARGET64_ISA_DEFAULT
#define TARGET_SUBTARGET64_ISA_DEFAULT TARGET_SUBTARGET32_ISA_DEFAULT

#undef GOT_SYMBOL_NAME
#define GOT_SYMBOL_NAME MACHOPIC_FUNCTION_BASE_NAME

/* Define the syntax of pseudo-ops, labels and comments.  */

#define LPREFIX "L"

/* Assembler pseudos to introduce constants of various size.  */

#define ASM_BYTE "\t.byte\t"
#define ASM_SHORT "\t.word\t"
#define ASM_LONG "\t.long\t"
#define ASM_QUAD "\t.quad\t"

#define SUBTARGET_ENCODE_SECTION_INFO  darwin_encode_section_info

#undef ASM_OUTPUT_ALIGN
#define ASM_OUTPUT_ALIGN(FILE,LOG)				   \
  do {								   \
    if ((LOG) != 0)						   \
      {								   \
	if (in_section == text_section)				   \
	  fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG));   \
	else							   \
	  fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG));	   \
      }								   \
  } while (0)

#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP)                    \
  do {                                                                  \
    if ((LOG) != 0) {                                                   \
      if ((MAX_SKIP) == 0 || (MAX_SKIP) >= (1 << (LOG)) - 1)            \
        fprintf ((FILE), "\t.p2align %d\n", (LOG));                     \
      else                                                              \
        fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP));     \
    }                                                                   \
  } while (0)
#endif

/* Darwin x86 assemblers support the .ident directive.  */

#undef TARGET_ASM_OUTPUT_IDENT
#define TARGET_ASM_OUTPUT_IDENT default_asm_output_ident_directive

/* We always want jump tables in the text section:
   * for PIC code, we need the subtracted symbol to be defined at
     assembly-time.
   * for mdynamic-no-pic, we cannot support jump tables in the .const
     section for weak functions, this looks to ld64 like direct access
     to the weak symbol from an anonymous atom.  */

#undef JUMP_TABLES_IN_TEXT_SECTION
#define JUMP_TABLES_IN_TEXT_SECTION 1

/* Darwin profiling -- call mcount.
   If we need a stub, then we unconditionally mark it as used.  */
#undef FUNCTION_PROFILER
#define FUNCTION_PROFILER(FILE, LABELNO)				\
  do {									\
    if (TARGET_MACHO_SYMBOL_STUBS 					\
	&& MACHOPIC_INDIRECT && !TARGET_64BIT)				\
      {									\
	const char *name = machopic_mcount_stub_name ();		\
	fprintf (FILE, "\tcall %s\n", name+1);  /*  skip '&'  */	\
      }									\
    else fprintf (FILE, "\tcall mcount\n");				\
  } while (0)

#define C_COMMON_OVERRIDE_OPTIONS					\
  do {									\
    SUBTARGET_C_COMMON_OVERRIDE_OPTIONS;				\
  } while (0)

#undef SUBTARGET_OVERRIDE_OPTIONS
#define SUBTARGET_OVERRIDE_OPTIONS					\
  do {									\
    if (TARGET_64BIT && MACHO_DYNAMIC_NO_PIC_P)				\
      target_flags &= ~MASK_MACHO_DYNAMIC_NO_PIC;			\
  } while (0)

/* Darwin on x86_64 uses dwarf-2 by default.  Pre-darwin9 32-bit
   compiles default to stabs+.  darwin9+ defaults to dwarf-2.  */
#ifndef DARWIN_PREFER_DWARF
#undef PREFERRED_DEBUGGING_TYPE
#ifdef HAVE_AS_STABS_DIRECTIVE
#define PREFERRED_DEBUGGING_TYPE (TARGET_64BIT ? DWARF2_DEBUG : DBX_DEBUG)
#else
#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
#endif
#endif

/* Darwin uses the standard DWARF register numbers but the default
   register numbers for STABS.  Fortunately for 64-bit code the
   default and the standard are the same.  */
#undef DBX_REGISTER_NUMBER
#define DBX_REGISTER_NUMBER(n) 					\
  (TARGET_64BIT ? dbx64_register_map[n]				\
   : write_symbols == DWARF2_DEBUG ? svr4_dbx_register_map[n]	\
   : dbx_register_map[n])

/* Unfortunately, the 32-bit EH information also doesn't use the standard
   DWARF register numbers.  */
#define DWARF2_FRAME_REG_OUT(n, for_eh)					\
  (! (for_eh) || write_symbols != DWARF2_DEBUG || TARGET_64BIT ? (n)	\
   : (n) == 5 ? 4							\
   : (n) == 4 ? 5							\
   : (n) >= 11 && (n) <= 18 ? (n) + 1					\
   : (n))

#undef REGISTER_SUBTARGET_PRAGMAS
#define REGISTER_SUBTARGET_PRAGMAS() DARWIN_REGISTER_TARGET_PRAGMAS()

#undef TARGET_SET_DEFAULT_TYPE_ATTRIBUTES
#define TARGET_SET_DEFAULT_TYPE_ATTRIBUTES darwin_set_default_type_attributes

/* For 64-bit, we need to add 4 because @GOTPCREL is relative to the
   end of the instruction, but without the 4 we'd only have the right
   address for the start of the instruction.  */
#undef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
  if (TARGET_64BIT)							\
    {									\
      if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_pcrel)		\
	{								\
	  fputs (ASM_LONG, FILE);					\
	  assemble_name (FILE, XSTR (ADDR, 0));				\
	  fputs ("+4@GOTPCREL", FILE);					\
	  goto DONE;							\
	}								\
    }									\
  else									\
    {									\
      if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1))		\
        {								\
          darwin_non_lazy_pcrel (FILE, ADDR);				\
          goto DONE;							\
        }								\
    }

/* First available SYMBOL flag bit for use by subtargets.  */
#define SYMBOL_FLAG_SUBT_DEP (SYMBOL_FLAG_MACH_DEP << 5)

#undef MACHOPIC_NL_SYMBOL_PTR_SECTION
#define MACHOPIC_NL_SYMBOL_PTR_SECTION \
		".section __IMPORT,__pointers,non_lazy_symbol_pointers"

#define SUBTARGET32_DEFAULT_CPU "i686"

#undef  SUBTARGET_INIT_BUILTINS
#define SUBTARGET_INIT_BUILTINS						\
  do {									\
    ix86_builtins[(int) IX86_BUILTIN_CFSTRING]				\
      = darwin_init_cfstring_builtins ((unsigned) (IX86_BUILTIN_CFSTRING)); \
    darwin_rename_builtins ();						\
  } while(0)

/* Define the shadow offset for asan.  */
#undef SUBTARGET_SHADOW_OFFSET
#define SUBTARGET_SHADOW_OFFSET	\
  (TARGET_LP64 ? HOST_WIDE_INT_1 << 44 : HOST_WIDE_INT_1 << 29)