/* Definitions of various defaults for tm.h macros.
Copyright (C) 1992, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
- 2005, 2007, 2008
+ 2005, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
Contributed by Ron Guilmette (rfg@monkeys.com)
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
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#ifndef GCC_DEFAULTS_H
#define GCC_DEFAULTS_H
-#ifndef GET_ENVIRONMENT
-#define GET_ENVIRONMENT(VALUE, NAME) do { (VALUE) = getenv (NAME); } while (0)
+/* How to start an assembler comment. */
+#ifndef ASM_COMMENT_START
+#define ASM_COMMENT_START ";#"
#endif
-#define obstack_chunk_alloc ((void *(*) (long)) xmalloc)
-#define obstack_chunk_free ((void (*) (void *)) free)
-#define OBSTACK_CHUNK_SIZE 0
-#define gcc_obstack_init(OBSTACK) \
- _obstack_begin ((OBSTACK), OBSTACK_CHUNK_SIZE, 0, \
- obstack_chunk_alloc, \
- obstack_chunk_free)
-
/* Store in OUTPUT a string (made with alloca) containing an
assembler-name for a local static variable or function named NAME.
LABELNO is an integer which is different for each call. */
#endif
#endif
+#ifndef IFUNC_ASM_TYPE
+#define IFUNC_ASM_TYPE "gnu_indirect_function"
+#endif
+
+#ifndef TLS_COMMON_ASM_OP
+#define TLS_COMMON_ASM_OP ".tls_common"
+#endif
+
#if defined (HAVE_AS_TLS) && !defined (ASM_OUTPUT_TLS_COMMON)
#define ASM_OUTPUT_TLS_COMMON(FILE, DECL, NAME, SIZE) \
do \
{ \
- fprintf ((FILE), "\t.tls_common\t"); \
+ fprintf ((FILE), "\t%s\t", TLS_COMMON_ASM_OP); \
assemble_name ((FILE), (NAME)); \
fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", \
(SIZE), DECL_ALIGN (DECL) / BITS_PER_UNIT); \
#endif
/* This is how to output the definition of a user-level label named
- NAME, such as the label on a static function or variable NAME. */
+ NAME, such as the label on variable NAME. */
#ifndef ASM_OUTPUT_LABEL
#define ASM_OUTPUT_LABEL(FILE,NAME) \
do { assemble_name ((FILE), (NAME)); fputs (":\n", (FILE)); } while (0)
#endif
+/* This is how to output the definition of a user-level label named
+ NAME, such as the label on a function. */
+
+#ifndef ASM_OUTPUT_FUNCTION_LABEL
+#define ASM_OUTPUT_FUNCTION_LABEL(FILE, NAME, DECL) \
+ ASM_OUTPUT_LABEL ((FILE), (NAME))
+#endif
+
/* Output the definition of a compiler-generated label named NAME. */
#ifndef ASM_OUTPUT_INTERNAL_LABEL
#define ASM_OUTPUT_INTERNAL_LABEL(FILE,NAME) \
#endif
#endif
-/* This determines whether or not we support weak symbols. */
+/* This determines whether or not we support weak symbols. SUPPORTS_WEAK
+ must be a preprocessor constant. */
#ifndef SUPPORTS_WEAK
#if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
#define SUPPORTS_WEAK 1
#endif
#endif
+/* This determines whether or not we support weak symbols during target
+ code generation. TARGET_SUPPORTS_WEAK can be any valid C expression. */
+#ifndef TARGET_SUPPORTS_WEAK
+#define TARGET_SUPPORTS_WEAK (SUPPORTS_WEAK)
+#endif
+
+/* This determines whether or not we support the discriminator
+ attribute in the .loc directive. */
+#ifndef SUPPORTS_DISCRIMINATOR
+#ifdef HAVE_GAS_DISCRIMINATOR
+#define SUPPORTS_DISCRIMINATOR 1
+#else
+#define SUPPORTS_DISCRIMINATOR 0
+#endif
+#endif
+
/* This determines whether or not we support link-once semantics. */
#ifndef SUPPORTS_ONE_ONLY
#ifdef MAKE_DECL_ONE_ONLY
/* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
the rest of the DWARF 2 frame unwind support is also provided. */
-#if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX) \
- && !defined (TARGET_UNWIND_INFO)
+#if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
#define DWARF2_UNWIND_INFO 1
#endif
#define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
#endif
+/* Offsets recorded in opcodes are a multiple of this alignment factor. */
+#ifndef DWARF_CIE_DATA_ALIGNMENT
+#ifdef STACK_GROWS_DOWNWARD
+#define DWARF_CIE_DATA_ALIGNMENT (-((int) UNITS_PER_WORD))
+#else
+#define DWARF_CIE_DATA_ALIGNMENT ((int) UNITS_PER_WORD)
+#endif
+#endif
+
+/* The DWARF 2 CFA column which tracks the return address. Normally this
+ is the column for PC, or the first column after all of the hard
+ registers. */
+#ifndef DWARF_FRAME_RETURN_COLUMN
+#ifdef PC_REGNUM
+#define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (PC_REGNUM)
+#else
+#define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGISTERS
+#endif
+#endif
+
/* How to renumber registers for dbx and gdb. If not defined, assume
no renumbering is necessary. */
#define DBX_REGISTER_NUMBER(REGNO) (REGNO)
#endif
+/* The mapping from gcc register number to DWARF 2 CFA column number.
+ By default, we just provide columns for all registers. */
+#ifndef DWARF_FRAME_REGNUM
+#define DWARF_FRAME_REGNUM(REG) DBX_REGISTER_NUMBER (REG)
+#endif
+
+/* Map register numbers held in the call frame info that gcc has
+ collected using DWARF_FRAME_REGNUM to those that should be output in
+ .debug_frame and .eh_frame. */
+#ifndef DWARF2_FRAME_REG_OUT
+#define DWARF2_FRAME_REG_OUT(REGNO, FOR_EH) (REGNO)
+#endif
+
+/* The size of addresses as they appear in the Dwarf 2 data.
+ Some architectures use word addresses to refer to code locations,
+ but Dwarf 2 info always uses byte addresses. On such machines,
+ Dwarf 2 addresses need to be larger than the architecture's
+ pointers. */
+#ifndef DWARF2_ADDR_SIZE
+#define DWARF2_ADDR_SIZE (POINTER_SIZE / BITS_PER_UNIT)
+#endif
+
+/* The size in bytes of a DWARF field indicating an offset or length
+ relative to a debug info section, specified to be 4 bytes in the
+ DWARF-2 specification. The SGI/MIPS ABI defines it to be the same
+ as PTR_SIZE. */
+#ifndef DWARF_OFFSET_SIZE
+#define DWARF_OFFSET_SIZE 4
+#endif
+
+/* The size in bytes of a DWARF 4 type signature. */
+#ifndef DWARF_TYPE_SIGNATURE_SIZE
+#define DWARF_TYPE_SIGNATURE_SIZE 8
+#endif
+
/* Default sizes for base C types. If the sizes are different for
your target, you should override these values by defining the
appropriate symbols in your tm.h file. */
#ifndef DECIMAL32_TYPE_SIZE
#define DECIMAL32_TYPE_SIZE 32
-#endif
+#endif
-#ifndef DECIMAL64_TYPE_SIZE
+#ifndef DECIMAL64_TYPE_SIZE
#define DECIMAL64_TYPE_SIZE 64
-#endif
+#endif
#ifndef DECIMAL128_TYPE_SIZE
#define DECIMAL128_TYPE_SIZE 128
#define LONG_LONG_ACCUM_TYPE_SIZE (LONG_LONG_FRACT_TYPE_SIZE * 2)
#endif
+/* We let tm.h override the types used here, to handle trivial differences
+ such as the choice of unsigned int or long unsigned int for size_t.
+ When machines start needing nontrivial differences in the size type,
+ it would be best to do something here to figure out automatically
+ from other information what type to use. */
+
+#ifndef SIZE_TYPE
+#define SIZE_TYPE "long unsigned int"
+#endif
+
+#ifndef PID_TYPE
+#define PID_TYPE "int"
+#endif
+
+/* If GCC knows the exact uint_least16_t and uint_least32_t types from
+ <stdint.h>, use them for char16_t and char32_t. Otherwise, use
+ these guesses; getting the wrong type of a given width will not
+ affect C++ name mangling because in C++ these are distinct types
+ not typedefs. */
+
+#ifdef UINT_LEAST16_TYPE
+#define CHAR16_TYPE UINT_LEAST16_TYPE
+#else
+#define CHAR16_TYPE "short unsigned int"
+#endif
+
+#ifdef UINT_LEAST32_TYPE
+#define CHAR32_TYPE UINT_LEAST32_TYPE
+#else
+#define CHAR32_TYPE "unsigned int"
+#endif
+
+#ifndef WCHAR_TYPE
+#define WCHAR_TYPE "int"
+#endif
+
+/* WCHAR_TYPE gets overridden by -fshort-wchar. */
+#define MODIFIED_WCHAR_TYPE \
+ (flag_short_wchar ? "short unsigned int" : WCHAR_TYPE)
+
+#ifndef PTRDIFF_TYPE
+#define PTRDIFF_TYPE "long int"
+#endif
+
+#ifndef WINT_TYPE
+#define WINT_TYPE "unsigned int"
+#endif
+
+#ifndef INTMAX_TYPE
+#define INTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
+ ? "int" \
+ : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
+ ? "long int" \
+ : "long long int"))
+#endif
+
+#ifndef UINTMAX_TYPE
+#define UINTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
+ ? "unsigned int" \
+ : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
+ ? "long unsigned int" \
+ : "long long unsigned int"))
+#endif
+
+
+/* There are no default definitions of these <stdint.h> types. */
+
+#ifndef SIG_ATOMIC_TYPE
+#define SIG_ATOMIC_TYPE ((const char *) NULL)
+#endif
+
+#ifndef INT8_TYPE
+#define INT8_TYPE ((const char *) NULL)
+#endif
+
+#ifndef INT16_TYPE
+#define INT16_TYPE ((const char *) NULL)
+#endif
+
+#ifndef INT32_TYPE
+#define INT32_TYPE ((const char *) NULL)
+#endif
+
+#ifndef INT64_TYPE
+#define INT64_TYPE ((const char *) NULL)
+#endif
+
+#ifndef UINT8_TYPE
+#define UINT8_TYPE ((const char *) NULL)
+#endif
+
+#ifndef UINT16_TYPE
+#define UINT16_TYPE ((const char *) NULL)
+#endif
+
+#ifndef UINT32_TYPE
+#define UINT32_TYPE ((const char *) NULL)
+#endif
+
+#ifndef UINT64_TYPE
+#define UINT64_TYPE ((const char *) NULL)
+#endif
+
+#ifndef INT_LEAST8_TYPE
+#define INT_LEAST8_TYPE ((const char *) NULL)
+#endif
+
+#ifndef INT_LEAST16_TYPE
+#define INT_LEAST16_TYPE ((const char *) NULL)
+#endif
+
+#ifndef INT_LEAST32_TYPE
+#define INT_LEAST32_TYPE ((const char *) NULL)
+#endif
+
+#ifndef INT_LEAST64_TYPE
+#define INT_LEAST64_TYPE ((const char *) NULL)
+#endif
+
+#ifndef UINT_LEAST8_TYPE
+#define UINT_LEAST8_TYPE ((const char *) NULL)
+#endif
+
+#ifndef UINT_LEAST16_TYPE
+#define UINT_LEAST16_TYPE ((const char *) NULL)
+#endif
+
+#ifndef UINT_LEAST32_TYPE
+#define UINT_LEAST32_TYPE ((const char *) NULL)
+#endif
+
+#ifndef UINT_LEAST64_TYPE
+#define UINT_LEAST64_TYPE ((const char *) NULL)
+#endif
+
+#ifndef INT_FAST8_TYPE
+#define INT_FAST8_TYPE ((const char *) NULL)
+#endif
+
+#ifndef INT_FAST16_TYPE
+#define INT_FAST16_TYPE ((const char *) NULL)
+#endif
+
+#ifndef INT_FAST32_TYPE
+#define INT_FAST32_TYPE ((const char *) NULL)
+#endif
+
+#ifndef INT_FAST64_TYPE
+#define INT_FAST64_TYPE ((const char *) NULL)
+#endif
+
+#ifndef UINT_FAST8_TYPE
+#define UINT_FAST8_TYPE ((const char *) NULL)
+#endif
+
+#ifndef UINT_FAST16_TYPE
+#define UINT_FAST16_TYPE ((const char *) NULL)
+#endif
+
+#ifndef UINT_FAST32_TYPE
+#define UINT_FAST32_TYPE ((const char *) NULL)
+#endif
+
+#ifndef UINT_FAST64_TYPE
+#define UINT_FAST64_TYPE ((const char *) NULL)
+#endif
+
+#ifndef INTPTR_TYPE
+#define INTPTR_TYPE ((const char *) NULL)
+#endif
+
+#ifndef UINTPTR_TYPE
+#define UINTPTR_TYPE ((const char *) NULL)
+#endif
+
/* Width in bits of a pointer. Mind the value of the macro `Pmode'. */
#ifndef POINTER_SIZE
#define POINTER_SIZE BITS_PER_WORD
#define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
#endif
+#ifndef PIC_OFFSET_TABLE_REG_CALL_CLOBBERED
+#define PIC_OFFSET_TABLE_REG_CALL_CLOBBERED 0
+#endif
+
#ifndef TARGET_DLLIMPORT_DECL_ATTRIBUTES
#define TARGET_DLLIMPORT_DECL_ATTRIBUTES 0
#endif
#define TARGET_DEFAULT_PACK_STRUCT 0
#endif
-/* By default, the C++ compiler will use function addresses in the
- vtable entries. Setting this nonzero tells the compiler to use
- function descriptors instead. The value of this macro says how
- many words wide the descriptor is (normally 2). It is assumed
- that the address of a function descriptor may be treated as a
- pointer to a function. */
-#ifndef TARGET_VTABLE_USES_DESCRIPTORS
-#define TARGET_VTABLE_USES_DESCRIPTORS 0
-#endif
-
/* By default, the vtable entries are void pointers, the so the alignment
is the same as pointer alignment. The value of this macro specifies
the alignment of the vtable entry in bits. It should be defined only
#define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
#endif
-#ifndef TARGET_FLT_EVAL_METHOD
+#ifndef REG_WORDS_BIG_ENDIAN
+#define REG_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
+#endif
+
+#ifdef TARGET_FLT_EVAL_METHOD
+#define TARGET_FLT_EVAL_METHOD_NON_DEFAULT 1
+#else
#define TARGET_FLT_EVAL_METHOD 0
+#define TARGET_FLT_EVAL_METHOD_NON_DEFAULT 0
#endif
#ifndef TARGET_DEC_EVAL_METHOD
#define TARGET_DEC_EVAL_METHOD 2
#endif
-#ifndef HOT_TEXT_SECTION_NAME
-#define HOT_TEXT_SECTION_NAME ".text.hot"
-#endif
-
-#ifndef UNLIKELY_EXECUTED_TEXT_SECTION_NAME
-#define UNLIKELY_EXECUTED_TEXT_SECTION_NAME ".text.unlikely"
-#endif
-
#ifndef HAS_LONG_COND_BRANCH
#define HAS_LONG_COND_BRANCH 0
#endif
#define HAS_LONG_UNCOND_BRANCH 0
#endif
-/* By default, only attempt to parallelize bitwise operations, and
- possibly adds/subtracts using bit-twiddling. */
-#ifndef UNITS_PER_SIMD_WORD
-#define UNITS_PER_SIMD_WORD(MODE) UNITS_PER_WORD
-#endif
-
/* Determine whether __cxa_atexit, rather than atexit, is used to
register C++ destructors for local statics and global objects. */
#ifndef DEFAULT_USE_CXA_ATEXIT
#endif /* old constraint mechanism in use */
-#ifndef REGISTER_MOVE_COST
-#define REGISTER_MOVE_COST(m, x, y) 2
-#endif
-
/* Determine whether the entire c99 runtime
is present in the runtime library. */
#ifndef TARGET_C99_FUNCTIONS
#define MOVE_MAX_PIECES MOVE_MAX
#endif
+#ifndef MAX_MOVE_MAX
+#define MAX_MOVE_MAX MOVE_MAX
+#endif
+
+#ifndef MIN_UNITS_PER_WORD
+#define MIN_UNITS_PER_WORD UNITS_PER_WORD
+#endif
+
+#ifndef MAX_BITS_PER_WORD
+#define MAX_BITS_PER_WORD BITS_PER_WORD
+#endif
+
#ifndef STACK_POINTER_OFFSET
#define STACK_POINTER_OFFSET 0
#endif
#define SHIFT_COUNT_TRUNCATED 0
#endif
-#ifndef LEGITIMIZE_ADDRESS
-#define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN)
-#endif
-
#ifndef LEGITIMATE_PIC_OPERAND_P
#define LEGITIMATE_PIC_OPERAND_P(X) 1
#endif
/* On most machines, the CFA coincides with the first incoming parm. */
#ifndef ARG_POINTER_CFA_OFFSET
-#define ARG_POINTER_CFA_OFFSET(FNDECL) FIRST_PARM_OFFSET (FNDECL)
+#define ARG_POINTER_CFA_OFFSET(FNDECL) \
+ (FIRST_PARM_OFFSET (FNDECL) + crtl->args.pretend_args_size)
#endif
/* On most machines, we use the CFA as DW_AT_frame_base. */
((TYPE) ? LOCAL_ALIGNMENT ((TYPE), (ALIGN)) : (ALIGN))
#endif
+#ifndef LOCAL_DECL_ALIGNMENT
+#define LOCAL_DECL_ALIGNMENT(DECL) \
+ LOCAL_ALIGNMENT (TREE_TYPE (DECL), DECL_ALIGN (DECL))
+#endif
+
+#ifndef MINIMUM_ALIGNMENT
+#define MINIMUM_ALIGNMENT(EXP,MODE,ALIGN) (ALIGN)
+#endif
+
/* Alignment value for attribute ((aligned)). */
#ifndef ATTRIBUTE_ALIGNED_VALUE
#define ATTRIBUTE_ALIGNED_VALUE BIGGEST_ALIGNMENT
#endif
+/* Many ports have no mode-dependent addresses (except possibly autoincrement
+ and autodecrement addresses, which are handled by target-independent code
+ in recog.c). */
+#ifndef GO_IF_MODE_DEPENDENT_ADDRESS
+#define GO_IF_MODE_DEPENDENT_ADDRESS(X, WIN)
+#endif
+
+/* For most ports anything that evaluates to a constant symbolic
+ or integer value is acceptable as a constant address. */
+#ifndef CONSTANT_ADDRESS_P
+#define CONSTANT_ADDRESS_P(X) (CONSTANT_P (X) && GET_CODE (X) != CONST_DOUBLE)
+#endif
+
+#ifndef MAX_FIXED_MODE_SIZE
+#define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (DImode)
+#endif
+
+/* Nonzero if structures and unions should be returned in memory.
+
+ This should only be defined if compatibility with another compiler or
+ with an ABI is needed, because it results in slower code. */
+
+#ifndef DEFAULT_PCC_STRUCT_RETURN
+#define DEFAULT_PCC_STRUCT_RETURN 1
+#endif
+
+#ifdef GCC_INSN_FLAGS_H
+/* Dependent default target macro definitions
+
+ This section of defaults.h defines target macros that depend on generated
+ headers. This is a bit awkward: We want to put all default definitions
+ for target macros in defaults.h, but some of the defaults depend on the
+ HAVE_* flags defines of insn-flags.h. But insn-flags.h is not always
+ included by files that do include defaults.h.
+
+ Fortunately, the default macro definitions that depend on the HAVE_*
+ macros are also the ones that will only be used inside GCC itself, i.e.
+ not in the gen* programs or in target objects like libgcc.
+
+ Obviously, it would be best to keep this section of defaults.h as small
+ as possible, by converting the macros defined below to target hooks or
+ functions.
+*/
+
+/* The default branch cost is 1. */
+#ifndef BRANCH_COST
+#define BRANCH_COST(speed_p, predictable_p) 1
+#endif
+
+/* If a memory-to-memory move would take MOVE_RATIO or more simple
+ move-instruction sequences, we will do a movmem or libcall instead. */
+
+#ifndef MOVE_RATIO
+#if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
+#define MOVE_RATIO(speed) 2
+#else
+/* If we are optimizing for space (-Os), cut down the default move ratio. */
+#define MOVE_RATIO(speed) ((speed) ? 15 : 3)
+#endif
+#endif
+
+/* If a clear memory operation would take CLEAR_RATIO or more simple
+ move-instruction sequences, we will do a setmem or libcall instead. */
+
+#ifndef CLEAR_RATIO
+#if defined (HAVE_setmemqi) || defined (HAVE_setmemhi) || defined (HAVE_setmemsi) || defined (HAVE_setmemdi) || defined (HAVE_setmemti)
+#define CLEAR_RATIO(speed) 2
+#else
+/* If we are optimizing for space, cut down the default clear ratio. */
+#define CLEAR_RATIO(speed) ((speed) ? 15 :3)
+#endif
+#endif
+
+/* If a memory set (to value other than zero) operation would take
+ SET_RATIO or more simple move-instruction sequences, we will do a movmem
+ or libcall instead. */
+#ifndef SET_RATIO
+#define SET_RATIO(speed) MOVE_RATIO(speed)
+#endif
+
+/* Supply a default definition for FUNCTION_ARG_PADDING:
+ usually pad upward, but pad short args downward on
+ big-endian machines. */
+
+#define DEFAULT_FUNCTION_ARG_PADDING(MODE, TYPE) \
+ (! BYTES_BIG_ENDIAN \
+ ? upward \
+ : (((MODE) == BLKmode \
+ ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
+ && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
+ : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
+ ? downward : upward))
+
+#ifndef FUNCTION_ARG_PADDING
+#define FUNCTION_ARG_PADDING(MODE, TYPE) \
+ DEFAULT_FUNCTION_ARG_PADDING ((MODE), (TYPE))
+#endif
+
+/* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
+ Normally move_insn, so Pmode stack pointer. */
+
+#ifndef STACK_SAVEAREA_MODE
+#define STACK_SAVEAREA_MODE(LEVEL) Pmode
+#endif
+
+/* Supply a default definition of STACK_SIZE_MODE for
+ allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */
+
+#ifndef STACK_SIZE_MODE
+#define STACK_SIZE_MODE word_mode
+#endif
+
+/* Provide default values for the macros controlling stack checking. */
+
+/* The default is neither full builtin stack checking... */
+#ifndef STACK_CHECK_BUILTIN
+#define STACK_CHECK_BUILTIN 0
+#endif
+
+/* ...nor static builtin stack checking. */
+#ifndef STACK_CHECK_STATIC_BUILTIN
+#define STACK_CHECK_STATIC_BUILTIN 0
+#endif
+
+/* The default interval is one page (4096 bytes). */
+#ifndef STACK_CHECK_PROBE_INTERVAL_EXP
+#define STACK_CHECK_PROBE_INTERVAL_EXP 12
+#endif
+
+/* The default is not to move the stack pointer. */
+#ifndef STACK_CHECK_MOVING_SP
+#define STACK_CHECK_MOVING_SP 0
+#endif
+
+/* This is a kludge to try to capture the discrepancy between the old
+ mechanism (generic stack checking) and the new mechanism (static
+ builtin stack checking). STACK_CHECK_PROTECT needs to be bumped
+ for the latter because part of the protection area is effectively
+ included in STACK_CHECK_MAX_FRAME_SIZE for the former. */
+#ifdef STACK_CHECK_PROTECT
+#define STACK_OLD_CHECK_PROTECT STACK_CHECK_PROTECT
+#else
+#define STACK_OLD_CHECK_PROTECT \
+ (targetm_common.except_unwind_info (&global_options) == UI_SJLJ \
+ ? 75 * UNITS_PER_WORD \
+ : 8 * 1024)
+#endif
+
+/* Minimum amount of stack required to recover from an anticipated stack
+ overflow detection. The default value conveys an estimate of the amount
+ of stack required to propagate an exception. */
+#ifndef STACK_CHECK_PROTECT
+#define STACK_CHECK_PROTECT \
+ (targetm_common.except_unwind_info (&global_options) == UI_SJLJ \
+ ? 75 * UNITS_PER_WORD \
+ : 12 * 1024)
+#endif
+
+/* Make the maximum frame size be the largest we can and still only need
+ one probe per function. */
+#ifndef STACK_CHECK_MAX_FRAME_SIZE
+#define STACK_CHECK_MAX_FRAME_SIZE \
+ ((1 << STACK_CHECK_PROBE_INTERVAL_EXP) - UNITS_PER_WORD)
+#endif
+
+/* This is arbitrary, but should be large enough everywhere. */
+#ifndef STACK_CHECK_FIXED_FRAME_SIZE
+#define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
+#endif
+
+/* Provide a reasonable default for the maximum size of an object to
+ allocate in the fixed frame. We may need to be able to make this
+ controllable by the user at some point. */
+#ifndef STACK_CHECK_MAX_VAR_SIZE
+#define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
+#endif
+
+/* By default, the C++ compiler will use function addresses in the
+ vtable entries. Setting this nonzero tells the compiler to use
+ function descriptors instead. The value of this macro says how
+ many words wide the descriptor is (normally 2). It is assumed
+ that the address of a function descriptor may be treated as a
+ pointer to a function. */
+#ifndef TARGET_VTABLE_USES_DESCRIPTORS
+#define TARGET_VTABLE_USES_DESCRIPTORS 0
+#endif
+
+#ifndef SWITCHABLE_TARGET
+#define SWITCHABLE_TARGET 0
+#endif
+
+#endif /* GCC_INSN_FLAGS_H */
+
#endif /* ! GCC_DEFAULTS_H */
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