/* Data structure definitions for a generic GCC target.
- Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ 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
-Free Software Foundation; either version 2, or (at your option) any
-later version.
+ 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
+ Free Software Foundation; either version 3, or (at your option) any
+ later version.
-This program 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.
+ This program 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 this program; if not, write to the Free Software
-Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ You should have received a copy of the GNU General Public License
+ along with this program; see the file COPYING3. If not see
+ <http://www.gnu.org/licenses/>.
+
+ 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
+ what you give them. Help stamp out software-hoarding! */
- 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
- what you give them. Help stamp out software-hoarding! */
/* This file contains a data structure that describes a GCC target.
At present it is incomplete, but in future it should grow to
#include "tm.h"
#include "insn-modes.h"
+/* Types used by the record_gcc_switches() target function. */
+typedef enum
+{
+ SWITCH_TYPE_PASSED, /* A switch passed on the command line. */
+ SWITCH_TYPE_ENABLED, /* An option that is currently enabled. */
+ SWITCH_TYPE_DESCRIPTIVE, /* Descriptive text, not a switch or option. */
+ SWITCH_TYPE_LINE_START, /* Please emit any necessary text at the start of a line. */
+ SWITCH_TYPE_LINE_END /* Please emit a line terminator. */
+}
+print_switch_type;
+
+typedef int (* print_switch_fn_type) (print_switch_type, const char *);
+
+/* An example implementation for ELF targets. Defined in varasm.c */
+extern int elf_record_gcc_switches (print_switch_type type, const char *);
+
+struct stdarg_info;
+struct spec_info_def;
+
+/* The struct used by the secondary_reload target hook. */
+typedef struct secondary_reload_info
+{
+ /* icode is actually an enum insn_code, but we don't want to force every
+ file that includes target.h to include optabs.h . */
+ int icode;
+ int extra_cost; /* Cost for using (a) scratch register(s) to be taken
+ into account by copy_cost. */
+ /* The next two members are for the use of the backward
+ compatibility hook. */
+ struct secondary_reload_info *prev_sri;
+ int t_icode; /* Actually an enum insn_code - see above. */
+} secondary_reload_info;
+
+/* This is defined in sched-int.h . */
+struct _dep;
+
+/* This is defined in ddg.h . */
+struct ddg;
+
struct gcc_target
{
/* Functions that output assembler for the target. */
/* Output code that will globalize a label. */
void (* globalize_label) (FILE *, const char *);
+ /* Output code that will globalize a declaration. */
+ void (* globalize_decl_name) (FILE *, tree);
+
/* 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 only a placeholder for an omitted FDE. */
void (* unwind_label) (FILE *, tree, int, int);
+ /* Output code that will emit a label to divide up the exception
+ table. */
+ void (* except_table_label) (FILE *);
+
/* Emit any directives required to unwind this instruction. */
void (* unwind_emit) (FILE *, rtx);
/* Output an internal label. */
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) (tree, int);
/* Output the assembler code for function exit. */
void (* function_epilogue) (FILE *, HOST_WIDE_INT);
+ /* Initialize target-specific sections. */
+ void (* init_sections) (void);
+
/* 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) (void);
+ /* Return a mask describing how relocations should be treated when
+ selecting sections. Bit 1 should be set if global relocations
+ should be placed in a read-write section; bit 0 should be set if
+ local relocations should be placed in a read-write section. */
+ int (*reloc_rw_mask) (void);
- /* Switch to the section that holds the exception frames. */
- void (* eh_frame_section) (void);
+ /* Return a section for EXP. It may be a DECL or a 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. */
+ section *(* select_section) (tree, int, unsigned HOST_WIDE_INT);
- /* Select and switch to a section for EXP. It may be a DECL or a
- 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) (enum machine_mode, rtx,
- unsigned HOST_WIDE_INT);
+ /* Return a section for X. MODE is X's mode and ALIGN is its
+ alignment in bits. */
+ section *(* 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) (tree, int);
- /* Tell assembler to switch to the readonly data section associated
- with function DECL. */
- void (* function_rodata_section) (tree);
+ /* Return the readonly data section associated with function DECL. */
+ section *(* function_rodata_section) (tree);
/* Output a constructor for a symbol with a given priority. */
void (* constructor) (rtx, int);
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) (tree thunk_decl, HOST_WIDE_INT delta,
+ bool (* can_output_mi_thunk) (const_tree thunk_decl, HOST_WIDE_INT delta,
HOST_WIDE_INT vcall_offset,
- tree function_decl);
+ const_tree function_decl);
/* Output any boilerplate text needed at the beginning of a
translation unit. */
external. */
void (*external_libcall) (rtx);
- /* Output an assembler directive to mark decl live. This instructs
+ /* 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 record of the command line switches that have been passed. */
+ print_switch_fn_type record_gcc_switches;
+ /* The name of the section that the example ELF implementation of
+ record_gcc_switches will use to store the information. Target
+ specific versions of record_gcc_switches may or may not use
+ this information. */
+ const char * record_gcc_switches_section;
+
+ /* Output the definition of a section anchor. */
+ void (*output_anchor) (rtx);
+
+ /* 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) (rtx insn, rtx link, rtx def_insn, int cost);
+ int (* adjust_cost) (rtx insn, rtx link, rtx dep_insn, int cost);
/* Adjust the priority of an insn as you see fit. Returns the new
priority. */
/* Finalize machine-dependent scheduling code. */
void (* md_finish) (FILE *, int);
- /* Initialize machine-dependent function while scheduling code. */
+ /* Initialize machine-dependent function wide scheduling code. */
void (* md_init_global) (FILE *, int, int);
/* Finalize machine-dependent function wide scheduling code. */
void (* init_dfa_post_cycle_insn) (void);
rtx (* dfa_post_cycle_insn) (void);
+ /* The values of the following two members are pointers to
+ functions used to simplify the automaton descriptions.
+ dfa_pre_advance_cycle and dfa_post_advance_cycle are getting called
+ immediately before and after cycle is advanced. */
+ void (* dfa_pre_advance_cycle) (void);
+ void (* dfa_post_advance_cycle) (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
cycle. */
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 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
+ DEP_PRO (&_DEP), and the insn DEP_CON (&_DEP). The first parameter is
+ the dep that represents the dependence between the two insns. The
+ second 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);
+ second insn (second parameter). */
+ bool (* is_costly_dependence) (struct _dep *_dep, int, int);
+
+ /* 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 of type DEP_TYPE. The default is to make no adjustment. */
+ int (* adjust_cost_2) (rtx insn, int, rtx dep_insn, int cost, int dw);
+
+ /* The following member value is a pointer to a function called
+ by the insn scheduler. This hook is called to notify the backend
+ that new instructions were emitted. */
+ void (* h_i_d_extended) (void);
+
+ /* Next 5 functions are for multi-point scheduling. */
+
+ /* Allocate memory for scheduler context. */
+ void *(* alloc_sched_context) (void);
+
+ /* Fills the context from the local machine scheduler context. */
+ void (* init_sched_context) (void *, bool);
+
+ /* Sets local machine scheduler context to a saved value. */
+ void (* set_sched_context) (void *);
+
+ /* Clears a scheduler context so it becomes like after init. */
+ void (* clear_sched_context) (void *);
+
+ /* Frees the scheduler context. */
+ void (* free_sched_context) (void *);
+
+ /* The following member value is a pointer to a function called
+ by the insn scheduler.
+ The first parameter is an instruction, the second parameter is the type
+ of the requested speculation, and the third parameter is a pointer to the
+ speculative pattern of the corresponding type (set if return value == 1).
+ It should return
+ -1, if there is no pattern, that will satisfy the requested speculation
+ type,
+ 0, if current pattern satisfies the requested speculation type,
+ 1, if pattern of the instruction should be changed to the newly
+ generated one. */
+ int (* speculate_insn) (rtx, int, rtx *);
+
+ /* The following member value is a pointer to a function called
+ by the insn scheduler. It should return true if the check instruction
+ passed as the parameter needs a recovery block. */
+ bool (* needs_block_p) (int);
+
+ /* The following member value is a pointer to a function called
+ by the insn scheduler. It should return a pattern for the check
+ instruction.
+ The first parameter is a speculative instruction, the second parameter
+ is the label of the corresponding recovery block (or null, if it is a
+ simple check). If the mutation of the check is requested (e.g. from
+ ld.c to chk.a), the third parameter is true - in this case the first
+ parameter is the previous check. */
+ rtx (* gen_spec_check) (rtx, rtx, int);
+
+ /* The following member value is a 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 the insn
+ passed as the parameter, the insn will not be chosen to be
+ issued. This hook is used to discard speculative instructions,
+ that stand at the first position of the ready list. */
+ bool (* first_cycle_multipass_dfa_lookahead_guard_spec) (const_rtx);
+
+ /* The following member value is a pointer to a function that provides
+ information about the speculation capabilities of the target.
+ The parameter is a pointer to spec_info variable. */
+ void (* set_sched_flags) (struct spec_info_def *);
+
+ /* Return speculation types of the instruction passed as the parameter. */
+ int (* get_insn_spec_ds) (rtx);
+
+ /* Return speculation types that are checked for the instruction passed as
+ the parameter. */
+ int (* get_insn_checked_ds) (rtx);
+
+ /* Return bool if rtx scanning should just skip current layer and
+ advance to the inner rtxes. */
+ bool (* skip_rtx_p) (const_rtx);
+
+ /* The following member value is a pointer to a function that provides
+ information about the target resource-based lower bound which is
+ used by the swing modulo scheduler. The parameter is a pointer
+ to ddg variable. */
+ int (* sms_res_mii) (struct ddg *);
} sched;
/* Functions relating to vectorization. */
by the vectorizer, and return the decl of the target builtin
function. */
tree (* builtin_mask_for_load) (void);
- } vectorize;
+
+ /* Returns a code for builtin that realizes vectorized version of
+ function, or NULL_TREE if not available. */
+ tree (* builtin_vectorized_function) (unsigned, tree, tree);
+
+ /* Returns a code for builtin that realizes vectorized version of
+ conversion, or NULL_TREE if not available. */
+ tree (* builtin_conversion) (unsigned, tree);
+
+ /* Target builtin that implements vector widening multiplication.
+ builtin_mul_widen_eve computes the element-by-element products
+ for the even elements, and builtin_mul_widen_odd computes the
+ element-by-element products for the odd elements. */
+ tree (* builtin_mul_widen_even) (tree);
+ tree (* builtin_mul_widen_odd) (tree);
+
+ /* Returns the cost to be added to the overheads involved with
+ executing the vectorized version of a loop. */
+ int (*builtin_vectorization_cost) (bool);
+
+ /* Return true if vector alignment is reachable (by peeling N
+ iterations) for the given type. */
+ bool (* vector_alignment_reachable) (const_tree, bool);
+
+ /* Target builtin that implements vector permute. */
+ tree (* builtin_vec_perm) (tree, tree*);
+} vectorize;
/* The initial value of target_flags. */
int default_target_flags;
form was. Return true if the switch was valid. */
bool (* handle_option) (size_t code, const char *arg, int value);
+ /* Display extra, target specific information in response to a
+ --target-help switch. */
+ void (* target_help) (void);
+
/* Return machine mode for filter value. */
enum machine_mode (* eh_return_filter_mode) (void);
+ /* Return machine mode for libgcc expanded cmp instructions. */
+ enum machine_mode (* libgcc_cmp_return_mode) (void);
+
+ /* Return machine mode for libgcc expanded shift instructions. */
+ enum machine_mode (* libgcc_shift_count_mode) (void);
+
+ /* Return machine mode to be used for _Unwind_Word type. */
+ enum machine_mode (* unwind_word_mode) (void);
+
/* Given two decls, merge their attributes and return the result. */
tree (* merge_decl_attributes) (tree, tree);
/* 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) (tree type1, tree type2);
+ int (* comp_type_attributes) (const_tree type1, const_tree type2);
/* Assign default attributes to the newly defined TYPE. */
void (* set_default_type_attributes) (tree type);
/* 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) (tree fndecl);
+ bool (* function_attribute_inlinable_p) (const_tree fndecl);
/* Return true if bitfields in RECORD_TYPE should follow the
Microsoft Visual C++ bitfield layout rules. */
- bool (* ms_bitfield_layout_p) (tree record_type);
+ bool (* ms_bitfield_layout_p) (const_tree record_type);
+
+ /* True if the target supports decimal floating point. */
+ bool (* decimal_float_supported_p) (void);
+
+ /* True if the target supports fixed-point. */
+ bool (* fixed_point_supported_p) (void);
/* Return true if anonymous bitfields affect structure alignment. */
bool (* align_anon_bitfield) (void);
+ /* Return true if volatile bitfields should use the narrowest type possible.
+ Return false if they should use the container type. */
+ bool (* narrow_volatile_bitfield) (void);
+
/* Set up target-specific built-in functions. */
void (* init_builtins) (void);
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);
+ /* Returns a code for a target-specific builtin that implements
+ reciprocal of the function, or NULL_TREE if not available. */
+ tree (* builtin_reciprocal) (unsigned, bool, bool);
+
+ /* For a vendor-specific TYPE, return a pointer to a statically-allocated
+ string containing the C++ mangling for TYPE. In all other cases, return
+ NULL. */
+ const char * (* mangle_type) (const_tree type);
/* Make any adjustments to libfunc names needed for this target. */
void (* init_libfuncs) (void);
/* True if the insn X cannot be duplicated. */
bool (* cannot_copy_insn_p) (rtx);
+ /* True if X is considered to be commutative. */
+ bool (* commutative_p) (const_rtx, int);
+
/* Given an address RTX, undo the effects of LEGITIMIZE_ADDRESS. */
rtx (* delegitimize_address) (rtx);
+ /* True if the given constant can be put into an object_block. */
+ bool (* use_blocks_for_constant_p) (enum machine_mode, const_rtx);
+
+ /* The minimum and maximum byte offsets for anchored addresses. */
+ HOST_WIDE_INT min_anchor_offset;
+ HOST_WIDE_INT max_anchor_offset;
+
+ /* True if section anchors can be used to access the given symbol. */
+ bool (* use_anchors_for_symbol_p) (const_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) (tree decl, tree exp);
+ /* Establish appropriate back-end context for processing the function
+ FNDECL. The argument might be NULL to indicate processing at top
+ level, outside of any function scope. */
+ void (*set_current_function) (tree fndecl);
+
/* True if EXP should be placed in a "small data" section. */
- bool (* in_small_data_p) (tree);
+ bool (* in_small_data_p) (const_tree);
/* True if EXP names an object for which name resolution must resolve
to the current module. */
- bool (* binds_local_p) (tree);
+ bool (* binds_local_p) (const_tree);
+
+ /* Modify and return the identifier of a DECL's external name,
+ originally identified by ID, as required by the target,
+ (eg, append @nn to windows32 stdcall function names).
+ The default is to return ID without modification. */
+ tree (* mangle_decl_assembler_name) (tree decl, tree id);
/* Do something target-specific to record properties of the DECL into
the associated SYMBOL_REF. */
return the mask that they apply. Return 0 otherwise. */
unsigned HOST_WIDE_INT (* shift_truncation_mask) (enum machine_mode mode);
+ /* Return the number of divisions in the given MODE that should be present,
+ so that it is profitable to turn the division into a multiplication by
+ the reciprocal. */
+ unsigned int (* min_divisions_for_recip_mul) (enum machine_mode mode);
+
+ /* If the representation of integral MODE is such that values are
+ always sign-extended to a wider mode MODE_REP then return
+ SIGN_EXTEND. Return UNKNOWN otherwise. */
+ /* Note that the return type ought to be RTX_CODE, but that's not
+ necessarily defined at this point. */
+ int (* mode_rep_extended) (enum machine_mode mode,
+ enum machine_mode mode_rep);
+
/* True if MODE is valid for a pointer in __attribute__((mode("MODE"))). */
bool (* valid_pointer_mode) (enum machine_mode mode);
bool (* vector_mode_supported_p) (enum machine_mode mode);
/* True if a vector is opaque. */
- bool (* vector_opaque_p) (tree);
+ bool (* vector_opaque_p) (const_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) (rtx x, int code, int outer_code, int *total);
+ bool (* rtx_costs) (rtx x, int code, int outer_code, int *total, bool speed);
/* Compute the cost of X, used as an address. Never called with
invalid addresses. */
- int (* address_cost) (rtx x);
+ int (* address_cost) (rtx x, bool speed);
+
+ /* Return where to allocate pseudo for a given hard register initial
+ value. */
+ rtx (* allocate_initial_value) (rtx x);
+
+ /* Return nonzero if evaluating UNSPEC[_VOLATILE] X might cause a trap.
+ FLAGS has the same meaning as in rtlanal.c: may_trap_p_1. */
+ int (* unspec_may_trap_p) (const_rtx x, unsigned flags);
/* Given a register, this hook should return a parallel of registers
to represent where to find the register pieces. Define this hook
hook should return NULL_RTX. */
rtx (* dwarf_register_span) (rtx);
+ /* If expand_builtin_init_dwarf_reg_sizes needs to fill in table
+ entries not corresponding directly to registers below
+ FIRST_PSEUDO_REGISTER, this hook should generate the necessary
+ code, given the address of the table. */
+ void (* init_dwarf_reg_sizes_extra) (tree);
+
/* 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
/* Create the __builtin_va_list type. */
tree (* build_builtin_va_list) (void);
+ /* Get the cfun/fndecl calling abi __builtin_va_list type. */
+ tree (* fn_abi_va_list) (tree);
+
+ /* Get the __builtin_va_list type dependent on input type. */
+ tree (* canonical_va_list_type) (tree);
+
+ /* Expand the __builtin_va_start builtin. */
+ void (* expand_builtin_va_start) (tree valist, rtx nextarg);
+
/* Gimplifies a VA_ARG_EXPR. */
- tree (* gimplify_va_arg_expr) (tree valist, tree type, tree *pre_p,
- tree *post_p);
+ tree (* gimplify_va_arg_expr) (tree valist, tree type, gimple_seq *pre_p,
+ gimple_seq *post_p);
/* Validity-checking routines for PCH files, target-specific.
get_pch_validity returns a pointer to the data to be stored,
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. */
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);
+ int (* dwarf_calling_convention) (const_tree);
/* This target hook allows the backend to emit frame-related insns that
contain UNSPECs or UNSPEC_VOLATILEs. The call frame debugging info
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. STMT is the statement. Returns true if the statement
+ doesn't need to be checked for va_list references. */
+ bool (* stdarg_optimize_hook) (struct stdarg_info *ai, const_gimple stmt);
+
+ /* 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) (const_rtx);
+
+ /* DECL is a variable or function with __attribute__((dllimport))
+ specified. Use this hook if the target needs to add extra validation
+ checks to handle_dll_attribute (). */
+ bool (* valid_dllimport_attribute_p) (const_tree decl);
+
/* 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);
+ bool (*promote_function_args) (const_tree fntype);
+ bool (*promote_function_return) (const_tree fntype);
+ bool (*promote_prototypes) (const_tree fntype);
rtx (*struct_value_rtx) (tree fndecl, int incoming);
- bool (*return_in_memory) (tree type, tree fndecl);
- bool (*return_in_msb) (tree type);
+ bool (*return_in_memory) (const_tree type, const_tree fndecl);
+ bool (*return_in_msb) (const_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);
+ const_tree type, bool named_arg);
rtx (*expand_builtin_saveregs) (void);
/* Returns pretend_argument_size. */
/* 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);
+ bool (* split_complex_arg) (const_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);
+ bool (* must_pass_in_stack) (enum machine_mode mode, const_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);
+ const_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
/* 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);
+ const char *(*invalid_arg_for_unprototyped_fn) (const_tree typelist,
+ const_tree funcdecl,
+ const_tree val);
+
+ /* Return an rtx for the return value location of the function
+ specified by FN_DECL_OR_TYPE with a return type of RET_TYPE. */
+ rtx (*function_value) (const_tree ret_type, const_tree fn_decl_or_type,
+ bool outgoing);
+
+ /* Return an rtx for the argument pointer incoming to the
+ current function. */
+ rtx (*internal_arg_pointer) (void);
+
+ /* Update the current function stack boundary if needed. */
+ void (*update_stack_boundary) (void);
+
+ /* Handle stack alignment and return an rtx for Dynamic Realign
+ Argument Pointer if necessary. */
+ rtx (*get_drap_rtx) (void);
+
+ /* Return true if all function parameters should be spilled to the
+ stack. */
+ bool (*allocate_stack_slots_for_args) (void);
+
} calls;
+ /* Return the diagnostic message string if conversion from FROMTYPE
+ to TOTYPE is not allowed, NULL otherwise. */
+ const char *(*invalid_conversion) (const_tree fromtype, const_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, const_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, const_tree type1, const_tree type2);
+
+ /* Return the array of IRA cover classes for the current target. */
+ const enum reg_class *(*ira_cover_classes) (void);
+
+ /* Return the class for a secondary reload, and fill in extra information. */
+ enum reg_class (*secondary_reload) (bool, rtx, enum reg_class,
+ enum machine_mode,
+ struct secondary_reload_info *);
+
+ /* This target hook allows the backend to perform additional
+ processing while initializing for variable expansion. */
+ void (* expand_to_rtl_hook) (void);
+
+ /* This target hook allows the backend to perform additional
+ instantiations on rtx that are not actually in insns yet,
+ but will be later. */
+ void (* instantiate_decls) (void);
+
+ /* Return true if is OK to use a hard register REGNO as scratch register
+ in peephole2. */
+ bool (* hard_regno_scratch_ok) (unsigned int regno);
+
+ /* Functions specific to the C family of frontends. */
+ struct c {
+ /* Return machine mode for non-standard suffix
+ or VOIDmode if non-standard suffixes are unsupported. */
+ enum machine_mode (*mode_for_suffix) (char);
+ } c;
+
/* Functions specific to the C++ frontend. */
struct cxx {
/* Return the integer type used for guard variables. */
itself. Returning true is the behavior required by the Itanium
C++ ABI. */
bool (*key_method_may_be_inline) (void);
- /* Returns true if all class data (virtual tables, type info,
- etc.) should be exported from the current DLL, even when the
- associated class is not exported. */
- bool (*export_class_data) (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 (the default) if the RTTI for the basic types,
+ which is always defined in the C++ runtime, should be COMDAT;
+ false if it should not be COMDAT. */
+ bool (*library_rtti_comdat) (void);
+ /* Returns true if __aeabi_atexit should be used to register static
+ destructors. */
+ bool (*use_aeabi_atexit) (void);
+ /* Returns true if target may use atexit in the same manner as
+ __cxa_atexit to register static destructors. */
+ bool (*use_atexit_for_cxa_atexit) (void);
+ /* TYPE is a C++ class (i.e., RECORD_TYPE or UNION_TYPE) that
+ has just been defined. Use this hook to make adjustments to the
+ class (eg, tweak visibility or perform any other required
+ target modifications). */
+ void (*adjust_class_at_definition) (tree type);
} cxx;
+ /* Functions and data for emulated TLS support. */
+ struct emutls {
+ /* Name of the address and common functions. */
+ const char *get_address;
+ const char *register_common;
+
+ /* Prefixes for proxy variable and template. */
+ const char *var_section;
+ const char *tmpl_section;
+
+ /* Prefixes for proxy variable and template. */
+ const char *var_prefix;
+ const char *tmpl_prefix;
+
+ /* Function to generate field definitions of the proxy variable. */
+ tree (*var_fields) (tree, tree *);
+
+ /* Function to initialize a proxy variable. */
+ tree (*var_init) (tree, tree, tree);
+
+ /* Whether we are allowed to alter the usual alignment of the
+ proxy variable. */
+ bool var_align_fixed;
+
+ /* Whether we can emit debug information for TLS vars. */
+ bool debug_form_tls_address;
+ } emutls;
+
+ struct target_option_hooks {
+ /* Function to validate the attribute((option(...))) strings or NULL. If
+ the option is validated, it is assumed that DECL_FUNCTION_SPECIFIC will
+ be filled in in the function decl node. */
+ bool (*valid_attribute_p) (tree, tree, tree, int);
+
+ /* Function to save any extra target state in the target options
+ structure. */
+ void (*save) (struct cl_target_option *);
+
+ /* Function to restore any extra target state from the target options
+ structure. */
+ void (*restore) (struct cl_target_option *);
+
+ /* Function to print any extra target state from the target options
+ structure. */
+ void (*print) (FILE *, int, struct cl_target_option *);
+
+ /* Function to parse arguments to be validated for #pragma option, and to
+ change the state if the options are valid. If the first argument is
+ NULL, the second argument specifies the default options to use. Return
+ true if the options are valid, and set the current state. */
+ bool (*pragma_parse) (tree, tree);
+
+ /* Function to determine if one function can inline another function. */
+ bool (*can_inline_p) (tree, tree);
+ } target_option;
+
+ /* For targets that need to mark extra registers as live on entry to
+ the function, they should define this target hook and set their
+ bits in the bitmap passed in. */
+ void (*live_on_entry) (bitmap);
+
+ /* True if unwinding tables should be generated by default. */
+ bool unwind_tables_default;
+
/* Leave the boolean fields at the end. */
/* True if arbitrary sections are supported. */
bool have_named_sections;
+ /* True if we can create zeroed data by switching to a BSS section
+ and then using ASM_OUTPUT_SKIP to allocate the space. */
+ bool have_switchable_bss_sections;
+
/* True if "native" constructors and destructors are supported,
false if we're using collect2 for the job. */
bool have_ctors_dtors;
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;
+struct gcc_targetcm {
+ /* 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_c_option) (size_t code, const char *arg, int value);
+};
+
+/* Each target can provide their own. */
+extern struct gcc_targetcm targetcm;
+
#endif /* GCC_TARGET_H */
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