diff options
Diffstat (limited to 'gcc/target.h')
| -rw-r--r-- | gcc/target.h | 1173 |
1 files changed, 21 insertions, 1152 deletions
diff --git a/gcc/target.h b/gcc/target.h index e17cc21f9fc..18d160dbeb2 100644 --- a/gcc/target.h +++ b/gcc/target.h @@ -110,1164 +110,33 @@ struct asm_int_op const char *ti; }; -/* The target structure. This holds all the backend hooks. */ - -struct gcc_target +/* Types of costs for vectorizer cost model. */ +enum vect_cost_for_stmt { - /* Functions that output assembler for the target. */ - struct asm_out - { - /* Opening and closing parentheses for asm expression grouping. */ - const char *open_paren, *close_paren; - - /* Assembler instructions for creating various kinds of integer object. */ - const char *byte_op; - struct asm_int_op aligned_op, unaligned_op; - - /* Try to output the assembler code for an integer object whose - value is given by X. SIZE is the size of the object in bytes and - 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) (rtx x, unsigned int size, int aligned_p); - - /* 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 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); - - /* 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 entry to a function. */ - void (* function_prologue) (FILE *, HOST_WIDE_INT); - - /* Output the assembler code for end of prologue. */ - void (* function_end_prologue) (FILE *); - - /* Output the assembler code for start of epilogue. */ - void (* function_begin_epilogue) (FILE *); - - /* 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); - - /* 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); - - /* 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); - - /* 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); - - /* 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); - - /* Output a destructor for a symbol with a given priority. */ - 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) (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 - would be returned from output_mi_thunk directly. But there's - 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) (const_tree thunk_decl, HOST_WIDE_INT delta, - HOST_WIDE_INT vcall_offset, - const_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 any boilerplate text needed at the beginning of an - LTO output stream. */ - void (*lto_start) (void); - - /* Output any boilerplate text needed at the end of an - LTO output stream. */ - void (*lto_end) (void); - - /* Output any boilerplace text needed at the end of a - translation unit before debug and unwind info is emitted. */ - void (*code_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 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); - - /* Some target machines need to postscan each insn after it is output. */ - void (*final_postscan_insn) (FILE *, rtx, rtx *, int); - - /* Emit the trampoline template. This hook may be NULL. */ - void (*trampoline_template) (FILE *); - } asm_out; - - /* Functions relating to instruction scheduling. */ - struct sched - { - /* 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 dep_insn, int cost); - - /* Adjust the priority of an insn as you see fit. Returns the new - priority. */ - 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) (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) (FILE *, int, rtx, int); - - /* Initialize machine-dependent scheduling code. */ - void (* md_init) (FILE *, int, int); - - /* Finalize machine-dependent scheduling code. */ - void (* md_finish) (FILE *, int); - - /* Initialize machine-dependent function wide 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) (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) (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 - returning insns which are used to change the pipeline hazard - recognizer state when the new simulated processor cycle - 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 members result in not changing the automaton state when - the new simulated processor cycle correspondingly starts and - finishes. */ - 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 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 - 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) (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) (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 - insn is not issued on given processors cycle. Instead of that, - the processor cycle is advanced. If the value passed through - the last parameter is zero, the insn ready queue is not sorted - on the new cycle start as usually. The first parameter passes - file for debugging output. The second one passes the scheduler - verbose level of the debugging output. The forth and the fifth - parameter values are correspondingly processor cycle on which - the previous insn has been issued and the current processor - 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 - 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 - 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. */ - 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); - - /* Returns a code for builtin that realizes vectorized version of - function, or NULL_TREE if not available. */ - tree (* builtin_vectorized_function) (tree, tree, tree); - - /* Returns a function declaration for a builtin that realizes the - vector conversion, or NULL_TREE if not available. */ - tree (* builtin_conversion) (unsigned, tree, 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*); - - /* Return true if a vector created for builtin_vec_perm is valid. */ - bool (* builtin_vec_perm_ok) (tree, tree); - - /* Return true if the target supports misaligned store/load of a - specific factor denoted in the third parameter. The last parameter - is true if the access is defined in a packed struct. */ - bool (* builtin_support_vector_misalignment) (enum machine_mode, - const_tree, int, bool); - } vectorize; - - /* The initial value of target_flags. */ - int default_target_flags; - - /* Allow target specific overriding of option settings after options have - been changed by an attribute or pragma or when it is reset at the - end of the code affected by an attribute or pragma. */ - void (* override_options_after_change) (void); - - /* 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); - - /* Handle target-specific parts of specifying -Ofast. */ - void (* handle_ofast) (void); - - /* 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); - - /* Given two types, merge their attributes and return the result. */ - tree (* merge_type_attributes) (tree, tree); - - /* Table of machine attributes and functions to handle them. - Ignored if NULL. */ - const struct attribute_spec *attribute_table; - - /* Return true iff attribute NAME expects a plain identifier as its first - argument. */ - bool (*attribute_takes_identifier_p) (const_tree name); - - /* 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) (const_tree type1, const_tree type2); - - /* Assign default attributes to the newly defined TYPE. */ - void (* set_default_type_attributes) (tree type); - - /* Insert attributes on the newly created DECL. */ - 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) (const_tree fndecl); - - /* Return true if bitfields in RECORD_TYPE should follow the - Microsoft Visual C++ bitfield layout rules. */ - 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); - - /* Initialize (if INITIALIZE_P is true) and return the target-specific - built-in function decl for CODE. - Return NULL if that is not possible. Return error_mark_node if CODE - is outside of the range of valid target builtin function codes. */ - tree (* builtin_decl) (unsigned code, bool initialize_p); - - /* Expand a target-specific builtin. */ - 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. PARAMS really - has type VEC(tree,gc)*, but we don't want to include tree.h - here. */ - tree (*resolve_overloaded_builtin) (unsigned int /*location_t*/, - tree decl, void *params); - - /* Fold a target-specific builtin. */ - tree (* fold_builtin) (tree fndecl, int nargs, tree *argp, bool ignore); - - /* 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); - - /* 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) (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) (void); - - /* Return a register class for which branch target register - optimizations should be applied. */ - enum reg_class (* 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); - - /* Return true if the target supports conditional execution. */ - bool (* have_conditional_execution) (void); - - /* Return a new value for loop unroll size. */ - unsigned (* loop_unroll_adjust) (unsigned nunroll, struct loop *loop); - - /* True if the constant X cannot be placed in the constant pool. */ - bool (* cannot_force_const_mem) (rtx); - - /* 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); - - /* True if ADDR is an address-expression whose effect depends - on the mode of the memory reference it is used in. */ - bool (* mode_dependent_address_p) (const_rtx addr); - - /* Given an invalid address X for a given machine mode, try machine-specific - ways to make it legitimate. Return X or an invalid address on failure. */ - rtx (* legitimize_address) (rtx, rtx, enum machine_mode); - - /* Given an address RTX, undo the effects of LEGITIMIZE_ADDRESS. */ - rtx (* delegitimize_address) (rtx); - - /* Given an address RTX, say whether it is valid. */ - bool (* legitimate_address_p) (enum machine_mode, rtx, bool); - - /* 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) (const_tree); - - /* True if EXP names an object for which name resolution must resolve - to the current executable or shared library. */ - 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. */ - void (* encode_section_info) (tree, rtx, int); - - /* Undo the effects of encode_section_info on the symbol string. */ - 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); - - /* 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); - - /* Support for named address spaces. */ - struct addr_space { - /* MODE to use for a pointer into another address space. */ - enum machine_mode (* pointer_mode) (addr_space_t); - - /* MODE to use for an address in another address space. */ - enum machine_mode (* address_mode) (addr_space_t); - - /* True if MODE is valid for a pointer in __attribute__((mode("MODE"))) - in another address space. */ - bool (* valid_pointer_mode) (enum machine_mode, addr_space_t); - - /* True if an address is a valid memory address to a given named address - space for a given mode. */ - bool (* legitimate_address_p) (enum machine_mode, rtx, bool, addr_space_t); - - /* Return an updated address to convert an invalid pointer to a named - address space to a valid one. If NULL_RTX is returned use machine - independent methods to make the address valid. */ - rtx (* legitimize_address) (rtx, rtx, enum machine_mode, addr_space_t); - - /* True if one named address space is a subset of another named address. */ - bool (* subset_p) (addr_space_t, addr_space_t); - - /* Function to convert an rtl expression from one address space to - another. */ - rtx (* convert) (rtx, tree, tree); - - } addr_space; - - /* 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 for MODE if the target expects that registers in this mode will - be allocated to registers in a small register class. The compiler is - allowed to use registers explicitly used in the rtl as spill registers - but it should prevent extending the lifetime of these registers. */ - bool (* small_register_classes_for_mode_p) (enum machine_mode mode); - - /* 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 speed); - - /* Compute the cost of X, used as an address. Never called with - invalid addresses. */ - 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 - 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); - - /* 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 - 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); - - /* Enumerate the va list variants. */ - int (* enum_va_list) (int, const char **, tree *); - - /* 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, 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, - 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) (const_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. 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); - - /* If non-zero, align constant anchors in CSE to a multiple of this - value. */ - unsigned HOST_WIDE_INT const_anchor; - - /* Functions relating to calls - argument passing, returns, etc. */ - struct calls { - enum machine_mode (*promote_function_mode) (const_tree type, - enum machine_mode mode, - int *punsignedp, - const_tree fntype, - int for_return); - bool (*promote_prototypes) (const_tree fntype); - rtx (*struct_value_rtx) (tree fndecl, int incoming); - 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, - const_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) (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, 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, - 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 - 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) (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 the rtx for the result of a libcall of mode MODE, - calling the function FN_NAME. */ - rtx (*libcall_value) (enum machine_mode, const_rtx); - - /* Return true if REGNO is a possible register number for - a function value as seen by the caller. */ - bool (*function_value_regno_p) (const unsigned int); - - /* 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); - - /* Return an rtx for the static chain for FNDECL. If INCOMING_P is true, - then it should be for the callee; otherwise for the caller. */ - rtx (*static_chain) (const_tree fndecl, bool incoming_p); - - /* Fill in the trampoline at MEM with a call to FNDECL and a - static chain value of CHAIN. */ - void (*trampoline_init) (rtx mem, tree fndecl, rtx chain); - - /* Adjust the address of the trampoline in a target-specific way. */ - rtx (*trampoline_adjust_address) (rtx addr); - } 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 diagnostic message string if TYPE is not valid as a - function parameter type, NULL otherwise. */ - const char *(*invalid_parameter_type) (const_tree type); - - /* Return the diagnostic message string if TYPE is not valid as a - function return type, NULL otherwise. */ - const char *(*invalid_return_type) (const_tree type); - - /* If values of TYPE are promoted to some other type when used in - expressions (analogous to the integer promotions), return that type, - or NULL_TREE otherwise. */ - tree (*promoted_type) (const_tree type); - - /* Convert EXPR to TYPE, if target-specific types with special conversion - rules are involved. Return the converted expression, or NULL to apply - the standard conversion rules. */ - tree (*convert_to_type) (tree type, tree expr); - - /* 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, - 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); - - /* Return the smallest number of different values for which it is best to - use a jump-table instead of a tree of conditional branches. */ - unsigned int (* case_values_threshold) (void); - - /* Retutn true if a function must have and use a frame pointer. */ - bool (* frame_pointer_required) (void); - - /* Returns true if the compiler is allowed to try to replace register number - from-reg with register number to-reg. */ - bool (* can_eliminate) (const int, const int); - - /* 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. */ - 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 (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; - - /* True if thread-local storage is supported. */ - bool have_tls; - - /* True if a small readonly data section is supported. */ - bool have_srodata_section; - - /* 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 extern_prefix is to be supported. */ - bool handle_pragma_extern_prefix; + scalar_stmt, + scalar_load, + scalar_store, + vector_stmt, + vector_load, + unaligned_load, + vector_store, + vec_to_scalar, + scalar_to_vec, + cond_branch_not_taken, + cond_branch_taken, + vec_perm +}; - /* True if the target is allowed to reorder memory accesses unless - synchronization is explicitly requested. */ - bool relaxed_ordering; +/* The target structure. This holds all the backend hooks. */ +#define DEFHOOKPOD(NAME, DOC, TYPE, INIT) TYPE NAME; +#define DEFHOOK(NAME, DOC, TYPE, PARAMS, INIT) TYPE (* NAME) PARAMS; +#define DEFHOOK_UNDOC DEFHOOK +#define HOOKSTRUCT(FRAGMENT) FRAGMENT - /* 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. */ -}; +#include "target.def" 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; |