/* Data structure definitions for a generic GCC target.
- Copyright (C) 2001, 2002 Free Software Foundation, Inc.
+ Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
-Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
In other words, you are welcome to use, share and improve this program.
You are forbidden to forbid anyone else to use, share and improve
to gradually reduce the amount of conditional compilation that is
scattered throughout GCC. */
+#ifndef GCC_TARGET_H
+#define GCC_TARGET_H
+
+#include "tm.h"
+#include "insn-modes.h"
+
+struct stdarg_info;
+
struct gcc_target
{
/* Functions that output assembler for the target. */
ALIGNED_P indicates whether it is aligned. Return true if
successful. Only handles cases for which BYTE_OP, ALIGNED_OP
and UNALIGNED_OP are NULL. */
- bool (* integer) PARAMS ((rtx x, unsigned int size, int aligned_p));
+ bool (* integer) (rtx x, unsigned int size, int aligned_p);
/* Output code that will globalize a label. */
- void (* globalize_label) PARAMS ((FILE *, const char *));
+ void (* globalize_label) (FILE *, const char *);
+
+ /* Output code that will emit a label for unwind info, if this
+ target requires such labels. Second argument is the decl the
+ unwind info is associated with, third is a boolean: true if
+ this is for exception handling, fourth is a boolean: true if
+ this is only a placeholder for an omitted FDE. */
+ void (* unwind_label) (FILE *, tree, int, int);
+
+ /* Emit any directives required to unwind this instruction. */
+ void (* unwind_emit) (FILE *, rtx);
/* Output an internal label. */
- void (* internal_label) PARAMS ((FILE *, const char *, unsigned long));
+ void (* internal_label) (FILE *, const char *, unsigned long);
+
+ /* Emit a ttype table reference to a typeinfo object. */
+ bool (* ttype) (rtx);
/* Emit an assembler directive to set visibility for the symbol
associated with the tree decl. */
- void (* visibility) PARAMS ((tree, int));
+ void (* visibility) (tree, int);
/* Output the assembler code for entry to a function. */
- void (* function_prologue) PARAMS ((FILE *, HOST_WIDE_INT));
+ void (* function_prologue) (FILE *, HOST_WIDE_INT);
/* Output the assembler code for end of prologue. */
- void (* function_end_prologue) PARAMS ((FILE *));
+ void (* function_end_prologue) (FILE *);
/* Output the assembler code for start of epilogue. */
- void (* function_begin_epilogue) PARAMS ((FILE *));
+ void (* function_begin_epilogue) (FILE *);
/* Output the assembler code for function exit. */
- void (* function_epilogue) PARAMS ((FILE *, HOST_WIDE_INT));
+ void (* function_epilogue) (FILE *, HOST_WIDE_INT);
- /* Switch to an arbitrary section NAME with attributes as
- specified by FLAGS. */
- void (* named_section) PARAMS ((const char *, unsigned int));
+ /* Tell assembler to change to section NAME with attributes FLAGS.
+ If DECL is non-NULL, it is the VAR_DECL or FUNCTION_DECL with
+ which this section is associated. */
+ void (* named_section) (const char *name, unsigned int flags, tree decl);
/* Switch to the section that holds the exception table. */
- void (* exception_section) PARAMS ((void));
+ void (* exception_section) (void);
/* Switch to the section that holds the exception frames. */
- void (* eh_frame_section) PARAMS ((void));
+ void (* eh_frame_section) (void);
/* Select and switch to a section for EXP. It may be a DECL or a
- constant for which TREE_CST_RTL is valid. RELOC is nonzero if
- runtime relocations must be applied; bit 1 will be set if the
- runtime relocations require non-local name resolution. ALIGN is
- the required alignment of the data. */
- void (* select_section) PARAMS ((tree, int, unsigned HOST_WIDE_INT));
+ constant. RELOC is nonzero if runtime relocations must be applied;
+ bit 1 will be set if the runtime relocations require non-local
+ name resolution. ALIGN is the required alignment of the data. */
+ void (* select_section) (tree, int, unsigned HOST_WIDE_INT);
/* Select and switch to a section for X with MODE. ALIGN is
the desired alignment of the data. */
- void (* select_rtx_section) PARAMS ((enum machine_mode, rtx,
- unsigned HOST_WIDE_INT));
+ void (* select_rtx_section) (enum machine_mode, rtx,
+ unsigned HOST_WIDE_INT);
/* Select a unique section name for DECL. RELOC is the same as
for SELECT_SECTION. */
- void (* unique_section) PARAMS ((tree, int));
+ void (* unique_section) (tree, int);
+
+ /* Tell assembler to switch to the readonly data section associated
+ with function DECL. */
+ void (* function_rodata_section) (tree);
/* Output a constructor for a symbol with a given priority. */
- void (* constructor) PARAMS ((rtx, int));
+ void (* constructor) (rtx, int);
/* Output a destructor for a symbol with a given priority. */
- void (* destructor) PARAMS ((rtx, int));
+ void (* destructor) (rtx, int);
/* Output the assembler code for a thunk function. THUNK_DECL is the
declaration for the thunk function itself, FUNCTION is the decl for
the target function. DELTA is an immediate constant offset to be
added to THIS. If VCALL_OFFSET is nonzero, the word at
*(*this + vcall_offset) should be added to THIS. */
- void (* output_mi_thunk) PARAMS ((FILE *file, tree thunk_decl,
- HOST_WIDE_INT delta,
- HOST_WIDE_INT vcall_offset,
- tree function_decl));
+ void (* output_mi_thunk) (FILE *file, tree thunk_decl,
+ HOST_WIDE_INT delta, HOST_WIDE_INT vcall_offset,
+ tree function_decl);
/* Determine whether output_mi_thunk would succeed. */
/* ??? Ideally, this hook would not exist, and success or failure
too much undo-able setup involved in invoking output_mi_thunk.
Could be fixed by making output_mi_thunk emit rtl instead of
text to the output file. */
- bool (* can_output_mi_thunk) PARAMS ((tree thunk_decl,
- HOST_WIDE_INT delta,
- HOST_WIDE_INT vcall_offset,
- tree function_decl));
+ bool (* can_output_mi_thunk) (tree thunk_decl, HOST_WIDE_INT delta,
+ HOST_WIDE_INT vcall_offset,
+ tree function_decl);
+
+ /* Output any boilerplate text needed at the beginning of a
+ translation unit. */
+ void (*file_start) (void);
+
+ /* Output any boilerplate text needed at the end of a
+ translation unit. */
+ void (*file_end) (void);
+
+ /* Output an assembler pseudo-op to declare a library function name
+ external. */
+ void (*external_libcall) (rtx);
+
+ /* Output an assembler directive to mark decl live. This instructs
+ linker to not dead code strip this symbol. */
+ void (*mark_decl_preserved) (const char *);
+
+ /* Output a DTP-relative reference to a TLS symbol. */
+ void (*output_dwarf_dtprel) (FILE *file, int size, rtx x);
+
} asm_out;
/* Functions relating to instruction scheduling. */
/* Given the current cost, COST, of an insn, INSN, calculate and
return a new cost based on its relationship to DEP_INSN through
the dependence LINK. The default is to make no adjustment. */
- int (* adjust_cost) PARAMS ((rtx insn, rtx link, rtx def_insn, int cost));
+ int (* adjust_cost) (rtx insn, rtx link, rtx def_insn, int cost);
/* Adjust the priority of an insn as you see fit. Returns the new
priority. */
- int (* adjust_priority) PARAMS ((rtx, int));
+ int (* adjust_priority) (rtx, int);
/* Function which returns the maximum number of insns that can be
scheduled in the same machine cycle. This must be constant
over an entire compilation. The default is 1. */
- int (* issue_rate) PARAMS ((void));
+ int (* issue_rate) (void);
/* Calculate how much this insn affects how many more insns we
can emit this cycle. Default is they all cost the same. */
- int (* variable_issue) PARAMS ((FILE *, int, rtx, int));
+ int (* variable_issue) (FILE *, int, rtx, int);
/* Initialize machine-dependent scheduling code. */
- void (* md_init) PARAMS ((FILE *, int, int));
+ void (* md_init) (FILE *, int, int);
/* Finalize machine-dependent scheduling code. */
- void (* md_finish) PARAMS ((FILE *, int));
+ void (* md_finish) (FILE *, int);
+
+ /* Initialize machine-dependent function while scheduling code. */
+ void (* md_init_global) (FILE *, int, int);
+
+ /* Finalize machine-dependent function wide scheduling code. */
+ void (* md_finish_global) (FILE *, int);
/* Reorder insns in a machine-dependent fashion, in two different
places. Default does nothing. */
- int (* reorder) PARAMS ((FILE *, int, rtx *, int *, int));
- int (* reorder2) PARAMS ((FILE *, int, rtx *, int *, int));
+ int (* reorder) (FILE *, int, rtx *, int *, int);
+ int (* reorder2) (FILE *, int, rtx *, int *, int);
/* The following member value is a pointer to a function called
after evaluation forward dependencies of insns in chain given
by two parameter values (head and tail correspondingly). */
- void (* dependencies_evaluation_hook) PARAMS ((rtx, rtx));
-
- /* The following member value is a pointer to a function returning
- nonzero if we should use DFA based scheduling. The default is
- to use the old pipeline scheduler. */
- int (* use_dfa_pipeline_interface) PARAMS ((void));
- /* The values of all the following members are used only for the
- DFA based scheduler: */
+ void (* dependencies_evaluation_hook) (rtx, rtx);
+
/* The values of the following four members are pointers to
functions used to simplify the automaton descriptions.
dfa_pre_cycle_insn and dfa_post_cycle_insn give functions
correspondingly starts and finishes. The function defined by
init_dfa_pre_cycle_insn and init_dfa_post_cycle_insn are used
to initialize the corresponding insns. The default values of
- the memebers result in not changing the automaton state when
+ the members result in not changing the automaton state when
the new simulated processor cycle correspondingly starts and
finishes. */
- void (* init_dfa_pre_cycle_insn) PARAMS ((void));
- rtx (* dfa_pre_cycle_insn) PARAMS ((void));
- void (* init_dfa_post_cycle_insn) PARAMS ((void));
- rtx (* dfa_post_cycle_insn) PARAMS ((void));
+ void (* init_dfa_pre_cycle_insn) (void);
+ rtx (* dfa_pre_cycle_insn) (void);
+ void (* init_dfa_post_cycle_insn) (void);
+ rtx (* dfa_post_cycle_insn) (void);
+
/* The following member value is a pointer to a function returning value
which defines how many insns in queue `ready' will we try for
- multi-pass scheduling. if the member value is nonzero and the
+ multi-pass scheduling. If the member value is nonzero and the
function returns positive value, the DFA based scheduler will make
multi-pass scheduling for the first cycle. In other words, we will
try to choose ready insn which permits to start maximum number of
insns on the same cycle. */
- int (* first_cycle_multipass_dfa_lookahead) PARAMS ((void));
+ int (* first_cycle_multipass_dfa_lookahead) (void);
+
/* The following member value is pointer to a function controlling
what insns from the ready insn queue will be considered for the
multipass insn scheduling. If the hook returns zero for insn
passed as the parameter, the insn will be not chosen to be
issued. */
- int (* first_cycle_multipass_dfa_lookahead_guard) PARAMS ((rtx));
+ int (* first_cycle_multipass_dfa_lookahead_guard) (rtx);
+
/* The following member value is pointer to a function called by
the insn scheduler before issuing insn passed as the third
parameter on given cycle. If the hook returns nonzero, the
parameter values are correspondingly processor cycle on which
the previous insn has been issued and the current processor
cycle. */
- int (* dfa_new_cycle) PARAMS ((FILE *, int, rtx, int, int, int *));
- /* The values of the following members are pointers to functions
- used to improve the first cycle multipass scheduling by
- inserting nop insns. dfa_scheduler_bubble gives a function
- returning a nop insn with given index. The indexes start with
- zero. The function should return NULL if there are no more nop
- insns with indexes greater than given index. To initialize the
- nop insn the function given by member
- init_dfa_scheduler_bubbles is used. The default values of the
- members result in not inserting nop insns during the multipass
- scheduling. */
- void (* init_dfa_bubbles) PARAMS ((void));
- rtx (* dfa_bubble) PARAMS ((int));
+ int (* dfa_new_cycle) (FILE *, int, rtx, int, int, int *);
+
+ /* The following member value is a pointer to a function called
+ by the insn scheduler. It should return true if there exists a
+ dependence which is considered costly by the target, between
+ the insn passed as the first parameter, and the insn passed as
+ the second parameter. The third parameter is the INSN_DEPEND
+ link that represents the dependence between the two insns. The
+ fourth argument is the cost of the dependence as estimated by
+ the scheduler. The last argument is the distance in cycles
+ between the already scheduled insn (first parameter) and the
+ the second insn (second parameter). */
+ bool (* is_costly_dependence) (rtx, rtx, rtx, int, int);
} sched;
+ /* Functions relating to vectorization. */
+ struct vectorize
+ {
+ /* The following member value is a pointer to a function called
+ by the vectorizer, and return the decl of the target builtin
+ function. */
+ tree (* builtin_mask_for_load) (void);
+ } vectorize;
+
+ /* The initial value of target_flags. */
+ int default_target_flags;
+
+ /* Handle target switch CODE (an OPT_* value). ARG is the argument
+ passed to the switch; it is NULL if no argument was. VALUE is the
+ value of ARG if CODE specifies a UInteger option, otherwise it is
+ 1 if the positive form of the switch was used and 0 if the negative
+ form was. Return true if the switch was valid. */
+ bool (* handle_option) (size_t code, const char *arg, int value);
+
+ /* Return machine mode for filter value. */
+ enum machine_mode (* eh_return_filter_mode) (void);
+
/* Given two decls, merge their attributes and return the result. */
- tree (* merge_decl_attributes) PARAMS ((tree, tree));
+ tree (* merge_decl_attributes) (tree, tree);
/* Given two types, merge their attributes and return the result. */
- tree (* merge_type_attributes) PARAMS ((tree, tree));
+ tree (* merge_type_attributes) (tree, tree);
/* Table of machine attributes and functions to handle them.
Ignored if NULL. */
/* Return zero if the attributes on TYPE1 and TYPE2 are incompatible,
one if they are compatible and two if they are nearly compatible
(which causes a warning to be generated). */
- int (* comp_type_attributes) PARAMS ((tree type1, tree type2));
+ int (* comp_type_attributes) (tree type1, tree type2);
/* Assign default attributes to the newly defined TYPE. */
- void (* set_default_type_attributes) PARAMS ((tree type));
+ void (* set_default_type_attributes) (tree type);
/* Insert attributes on the newly created DECL. */
- void (* insert_attributes) PARAMS ((tree decl, tree *attributes));
+ void (* insert_attributes) (tree decl, tree *attributes);
/* Return true if FNDECL (which has at least one machine attribute)
can be inlined despite its machine attributes, false otherwise. */
- bool (* function_attribute_inlinable_p) PARAMS ((tree fndecl));
+ bool (* function_attribute_inlinable_p) (tree fndecl);
/* Return true if bitfields in RECORD_TYPE should follow the
Microsoft Visual C++ bitfield layout rules. */
- bool (* ms_bitfield_layout_p) PARAMS ((tree record_type));
+ bool (* ms_bitfield_layout_p) (tree record_type);
+
+ /* Return true if anonymous bitfields affect structure alignment. */
+ bool (* align_anon_bitfield) (void);
/* Set up target-specific built-in functions. */
- void (* init_builtins) PARAMS ((void));
+ void (* init_builtins) (void);
/* Expand a target-specific builtin. */
- rtx (* expand_builtin) PARAMS ((tree exp, rtx target, rtx subtarget,
- enum machine_mode mode, int ignore));
+ rtx (* expand_builtin) (tree exp, rtx target, rtx subtarget,
+ enum machine_mode mode, int ignore);
+
+ /* Select a replacement for a target-specific builtin. This is done
+ *before* regular type checking, and so allows the target to implement
+ a crude form of function overloading. The result is a complete
+ expression that implements the operation. */
+ tree (*resolve_overloaded_builtin) (tree decl, tree params);
+
+ /* Fold a target-specific builtin. */
+ tree (* fold_builtin) (tree fndecl, tree arglist, bool ignore);
+
+ /* For a vendor-specific fundamental TYPE, return a pointer to
+ a statically-allocated string containing the C++ mangling for
+ TYPE. In all other cases, return NULL. */
+ const char * (* mangle_fundamental_type) (tree type);
+
+ /* Make any adjustments to libfunc names needed for this target. */
+ void (* init_libfuncs) (void);
/* Given a decl, a section name, and whether the decl initializer
has relocs, choose attributes for the section. */
/* ??? Should be merged with SELECT_SECTION and UNIQUE_SECTION. */
- unsigned int (* section_type_flags) PARAMS ((tree, const char *, int));
+ unsigned int (* section_type_flags) (tree, const char *, int);
/* True if new jumps cannot be created, to replace existing ones or
not, at the current point in the compilation. */
- bool (* cannot_modify_jumps_p) PARAMS ((void));
+ bool (* cannot_modify_jumps_p) (void);
+
+ /* Return a register class for which branch target register
+ optimizations should be applied. */
+ int (* branch_target_register_class) (void);
+
+ /* Return true if branch target register optimizations should include
+ callee-saved registers that are not already live during the current
+ function. AFTER_PE_GEN is true if prologues and epilogues have
+ already been generated. */
+ bool (* branch_target_register_callee_saved) (bool after_pe_gen);
/* True if the constant X cannot be placed in the constant pool. */
- bool (* cannot_force_const_mem) PARAMS ((rtx));
+ bool (* cannot_force_const_mem) (rtx);
+
+ /* True if the insn X cannot be duplicated. */
+ bool (* cannot_copy_insn_p) (rtx);
+
+ /* Given an address RTX, undo the effects of LEGITIMIZE_ADDRESS. */
+ rtx (* delegitimize_address) (rtx);
/* True if it is OK to do sibling call optimization for the specified
call expression EXP. DECL will be the called function, or NULL if
this is an indirect call. */
- bool (*function_ok_for_sibcall) PARAMS ((tree decl, tree exp));
-
+ bool (*function_ok_for_sibcall) (tree decl, tree exp);
+
/* True if EXP should be placed in a "small data" section. */
- bool (* in_small_data_p) PARAMS ((tree));
+ bool (* in_small_data_p) (tree);
/* True if EXP names an object for which name resolution must resolve
to the current module. */
- bool (* binds_local_p) PARAMS ((tree));
+ bool (* binds_local_p) (tree);
/* Do something target-specific to record properties of the DECL into
the associated SYMBOL_REF. */
- void (* encode_section_info) PARAMS ((tree, int));
+ void (* encode_section_info) (tree, rtx, int);
/* Undo the effects of encode_section_info on the symbol string. */
- const char * (* strip_name_encoding) PARAMS ((const char *));
+ const char * (* strip_name_encoding) (const char *);
+
+ /* If shift optabs for MODE are known to always truncate the shift count,
+ return the mask that they apply. Return 0 otherwise. */
+ unsigned HOST_WIDE_INT (* shift_truncation_mask) (enum machine_mode mode);
/* True if MODE is valid for a pointer in __attribute__((mode("MODE"))). */
- bool (* valid_pointer_mode) PARAMS ((enum machine_mode mode));
+ bool (* valid_pointer_mode) (enum machine_mode mode);
+
+ /* True if MODE is valid for the target. By "valid", we mean able to
+ be manipulated in non-trivial ways. In particular, this means all
+ the arithmetic is supported. */
+ bool (* scalar_mode_supported_p) (enum machine_mode mode);
+
+ /* Similarly for vector modes. "Supported" here is less strict. At
+ least some operations are supported; need to check optabs or builtins
+ for further details. */
+ bool (* vector_mode_supported_p) (enum machine_mode mode);
+
+ /* True if a vector is opaque. */
+ bool (* vector_opaque_p) (tree);
/* Compute a (partial) cost for rtx X. Return true if the complete
cost has been computed, and false if subexpressions should be
scanned. In either case, *TOTAL contains the cost result. */
/* Note that CODE and OUTER_CODE ought to be RTX_CODE, but that's
not necessarily defined at this point. */
- bool (* rtx_costs) PARAMS ((rtx x, int code, int outer_code, int *total));
+ bool (* rtx_costs) (rtx x, int code, int outer_code, int *total);
+
+ /* Compute the cost of X, used as an address. Never called with
+ invalid addresses. */
+ int (* address_cost) (rtx x);
+
+ /* Given a register, this hook should return a parallel of registers
+ to represent where to find the register pieces. Define this hook
+ if the register and its mode are represented in Dwarf in
+ non-contiguous locations, or if the register should be
+ represented in more than one register in Dwarf. Otherwise, this
+ hook should return NULL_RTX. */
+ rtx (* dwarf_register_span) (rtx);
+
+ /* Fetch the fixed register(s) which hold condition codes, for
+ targets where it makes sense to look for duplicate assignments to
+ the condition codes. This should return true if there is such a
+ register, false otherwise. The arguments should be set to the
+ fixed register numbers. Up to two condition code registers are
+ supported. If there is only one for this target, the int pointed
+ at by the second argument should be set to -1. */
+ bool (* fixed_condition_code_regs) (unsigned int *, unsigned int *);
+
+ /* If two condition code modes are compatible, return a condition
+ code mode which is compatible with both, such that a comparison
+ done in the returned mode will work for both of the original
+ modes. If the condition code modes are not compatible, return
+ VOIDmode. */
+ enum machine_mode (* cc_modes_compatible) (enum machine_mode,
+ enum machine_mode);
+
+ /* Do machine-dependent code transformations. Called just before
+ delayed-branch scheduling. */
+ void (* machine_dependent_reorg) (void);
+
+ /* Create the __builtin_va_list type. */
+ tree (* build_builtin_va_list) (void);
+
+ /* Gimplifies a VA_ARG_EXPR. */
+ tree (* gimplify_va_arg_expr) (tree valist, tree type, tree *pre_p,
+ tree *post_p);
+
+ /* Validity-checking routines for PCH files, target-specific.
+ get_pch_validity returns a pointer to the data to be stored,
+ and stores the size in its argument. pch_valid_p gets the same
+ information back and returns NULL if the PCH is valid,
+ or an error message if not.
+ */
+ void * (* get_pch_validity) (size_t *);
+ const char * (* pch_valid_p) (const void *, size_t);
+
+ /* If nonnull, this function checks whether a PCH file with the
+ given set of target flags can be used. It returns NULL if so,
+ otherwise it returns an error message. */
+ const char *(*check_pch_target_flags) (int);
+
+ /* True if the compiler should give an enum type only as many
+ bytes as it takes to represent the range of possible values of
+ that type. */
+ bool (* default_short_enums) (void);
+
+ /* This target hook returns an rtx that is used to store the address
+ of the current frame into the built-in setjmp buffer. */
+ rtx (* builtin_setjmp_frame_value) (void);
+
+ /* This target hook should add STRING_CST trees for any hard regs
+ the port wishes to automatically clobber for an asm. */
+ tree (* md_asm_clobbers) (tree, tree, tree);
+
+ /* This target hook allows the backend to specify a calling convention
+ in the debug information. This function actually returns an
+ enum dwarf_calling_convention, but because of forward declarations
+ and not wanting to include dwarf2.h everywhere target.h is included
+ the function is being declared as an int. */
+ int (* dwarf_calling_convention) (tree);
+
+ /* This target hook allows the backend to emit frame-related insns that
+ contain UNSPECs or UNSPEC_VOLATILEs. The call frame debugging info
+ engine will invoke it on insns of the form
+ (set (reg) (unspec [...] UNSPEC_INDEX))
+ and
+ (set (reg) (unspec_volatile [...] UNSPECV_INDEX))
+ to let the backend emit the call frame instructions. */
+ void (* dwarf_handle_frame_unspec) (const char *, rtx, int);
+
+ /* Perform architecture specific checking of statements gimplified
+ from VA_ARG_EXPR. LHS is left hand side of MODIFY_EXPR, RHS
+ is right hand side. Returns true if the statements doesn't need
+ to be checked for va_list references. */
+ bool (* stdarg_optimize_hook) (struct stdarg_info *ai, tree lhs, tree rhs);
+
+ /* This target hook allows the operating system to override the DECL
+ that represents the external variable that contains the stack
+ protection guard variable. The type of this DECL is ptr_type_node. */
+ tree (* stack_protect_guard) (void);
+
+ /* This target hook allows the operating system to override the CALL_EXPR
+ that is invoked when a check vs the guard variable fails. */
+ tree (* stack_protect_fail) (void);
+
+ /* Returns NULL if target supports the insn within a doloop block,
+ otherwise it returns an error message. */
+ const char * (*invalid_within_doloop) (rtx);
+
+ /* Functions relating to calls - argument passing, returns, etc. */
+ struct calls {
+ bool (*promote_function_args) (tree fntype);
+ bool (*promote_function_return) (tree fntype);
+ bool (*promote_prototypes) (tree fntype);
+ rtx (*struct_value_rtx) (tree fndecl, int incoming);
+ bool (*return_in_memory) (tree type, tree fndecl);
+ bool (*return_in_msb) (tree type);
+
+ /* Return true if a parameter must be passed by reference. TYPE may
+ be null if this is a libcall. CA may be null if this query is
+ from __builtin_va_arg. */
+ bool (*pass_by_reference) (CUMULATIVE_ARGS *ca, enum machine_mode mode,
+ tree type, bool named_arg);
+
+ rtx (*expand_builtin_saveregs) (void);
+ /* Returns pretend_argument_size. */
+ void (*setup_incoming_varargs) (CUMULATIVE_ARGS *ca, enum machine_mode mode,
+ tree type, int *pretend_arg_size,
+ int second_time);
+ bool (*strict_argument_naming) (CUMULATIVE_ARGS *ca);
+ /* Returns true if we should use
+ targetm.calls.setup_incoming_varargs() and/or
+ targetm.calls.strict_argument_naming(). */
+ bool (*pretend_outgoing_varargs_named) (CUMULATIVE_ARGS *ca);
+
+ /* Given a complex type T, return true if a parameter of type T
+ should be passed as two scalars. */
+ bool (* split_complex_arg) (tree type);
+
+ /* Return true if type T, mode MODE, may not be passed in registers,
+ but must be passed on the stack. */
+ /* ??? This predicate should be applied strictly after pass-by-reference.
+ Need audit to verify that this is the case. */
+ bool (* must_pass_in_stack) (enum machine_mode mode, tree t);
+
+ /* Return true if type TYPE, mode MODE, which is passed by reference,
+ should have the object copy generated by the callee rather than
+ the caller. It is never called for TYPE requiring constructors. */
+ bool (* callee_copies) (CUMULATIVE_ARGS *ca, enum machine_mode mode,
+ tree type, bool named);
+
+ /* Return zero for arguments passed entirely on the stack or entirely
+ in registers. If passed in both, return the number of bytes passed
+ in registers; the balance is therefore passed on the stack. */
+ int (* arg_partial_bytes) (CUMULATIVE_ARGS *ca, enum machine_mode mode,
+ tree type, bool named);
+
+ /* Return the diagnostic message string if function without a prototype
+ is not allowed for this 'val' argument; NULL otherwise. */
+ const char *(*invalid_arg_for_unprototyped_fn) (tree typelist,
+ tree funcdecl, tree val);
+ } calls;
+
+ /* Return the diagnostic message string if conversion from FROMTYPE
+ to TOTYPE is not allowed, NULL otherwise. */
+ const char *(*invalid_conversion) (tree fromtype, tree totype);
+
+ /* Return the diagnostic message string if the unary operation OP is
+ not permitted on TYPE, NULL otherwise. */
+ const char *(*invalid_unary_op) (int op, tree type);
+
+ /* Return the diagnostic message string if the binary operation OP
+ is not permitted on TYPE1 and TYPE2, NULL otherwise. */
+ const char *(*invalid_binary_op) (int op, tree type1, tree type2);
+
+ /* Functions specific to the C++ frontend. */
+ struct cxx {
+ /* Return the integer type used for guard variables. */
+ tree (*guard_type) (void);
+ /* Return true if only the low bit of the guard should be tested. */
+ bool (*guard_mask_bit) (void);
+ /* Returns the size of the array cookie for an array of type. */
+ tree (*get_cookie_size) (tree);
+ /* Returns true if the element size should be stored in the
+ array cookie. */
+ bool (*cookie_has_size) (void);
+ /* Allows backends to perform additional processing when
+ deciding if a class should be exported or imported. */
+ int (*import_export_class) (tree, int);
+ /* Returns true if constructors and destructors return "this". */
+ bool (*cdtor_returns_this) (void);
+ /* Returns true if the key method for a class can be an inline
+ function, so long as it is not declared inline in the class
+ itself. Returning true is the behavior required by the Itanium
+ C++ ABI. */
+ bool (*key_method_may_be_inline) (void);
+ /* DECL is a virtual table, virtual table table, typeinfo object,
+ or other similar implicit class data object that will be
+ emitted with external linkage in this translation unit. No ELF
+ visibility has been explicitly specified. If the target needs
+ to specify a visibility other than that of the containing class,
+ use this hook to set DECL_VISIBILITY and
+ DECL_VISIBILITY_SPECIFIED. */
+ void (*determine_class_data_visibility) (tree decl);
+ /* Returns true (the default) if virtual tables and other
+ similar implicit class data objects are always COMDAT if they
+ have external linkage. If this hook returns false, then
+ class data for classes whose virtual table will be emitted in
+ only one translation unit will not be COMDAT. */
+ bool (*class_data_always_comdat) (void);
+ /* Returns true if __aeabi_atexit should be used to register static
+ destructors. */
+ bool (*use_aeabi_atexit) (void);
+ } cxx;
+
+ /* True if unwinding tables should be generated by default. */
+ bool unwind_tables_default;
/* Leave the boolean fields at the end. */
/* True if EH frame info sections should be zero-terminated. */
bool terminate_dw2_eh_frame_info;
+
+ /* True if #NO_APP should be emitted at the beginning of
+ assembly output. */
+ bool file_start_app_off;
+
+ /* True if output_file_directive should be called for main_input_filename
+ at the beginning of assembly output. */
+ bool file_start_file_directive;
+
+ /* True if #pragma redefine_extname is to be supported. */
+ bool handle_pragma_redefine_extname;
+
+ /* True if #pragma extern_prefix is to be supported. */
+ bool handle_pragma_extern_prefix;
+
+ /* True if the target is allowed to reorder memory accesses unless
+ synchronization is explicitly requested. */
+ bool relaxed_ordering;
+
+ /* Returns true if we should generate exception tables for use with the
+ ARM EABI. The effects the encoding of function exception specifications.
+ */
+ bool arm_eabi_unwinder;
+
+ /* Leave the boolean fields at the end. */
};
extern struct gcc_target targetm;
+
+#endif /* GCC_TARGET_H */
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