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851 lines
37 KiB
C++
851 lines
37 KiB
C++
/* Data structure definitions for a generic GCC target.
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Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
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Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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In other words, you are welcome to use, share and improve this program.
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You are forbidden to forbid anyone else to use, share and improve
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what you give them. Help stamp out software-hoarding! */
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/* This file contains a data structure that describes a GCC target.
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At present it is incomplete, but in future it should grow to
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contain most or all target machine and target O/S specific
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information.
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This structure has its initializer declared in target-def.h in the
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form of large macro TARGET_INITIALIZER that expands to many smaller
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macros.
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The smaller macros each initialize one component of the structure,
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and each has a default. Each target should have a file that
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includes target.h and target-def.h, and overrides any inappropriate
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defaults by undefining the relevant macro and defining a suitable
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replacement. That file should then contain the definition of
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"targetm" like so:
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struct gcc_target targetm = TARGET_INITIALIZER;
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Doing things this way allows us to bring together everything that
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defines a GCC target. By supplying a default that is appropriate
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to most targets, we can easily add new items without needing to
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edit dozens of target configuration files. It should also allow us
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to gradually reduce the amount of conditional compilation that is
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scattered throughout GCC. */
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#ifndef GCC_TARGET_H
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#define GCC_TARGET_H
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#include "tm.h"
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#include "insn-modes.h"
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struct stdarg_info;
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struct spec_info_def;
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/* The struct used by the secondary_reload target hook. */
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typedef struct secondary_reload_info
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{
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/* icode is actually an enum insn_code, but we don't want to force every
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file that includes target.h to include optabs.h . */
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int icode;
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int extra_cost; /* Cost for using (a) scratch register(s) to be taken
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into account by copy_cost. */
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/* The next two members are for the use of the backward
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compatibility hook. */
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struct secondary_reload_info *prev_sri;
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int t_icode; /* Actually an enum insn_code - see above. */
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} secondary_reload_info;
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struct gcc_target
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{
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/* Functions that output assembler for the target. */
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struct asm_out
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{
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/* Opening and closing parentheses for asm expression grouping. */
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const char *open_paren, *close_paren;
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/* Assembler instructions for creating various kinds of integer object. */
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const char *byte_op;
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struct asm_int_op
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{
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const char *hi;
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const char *si;
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const char *di;
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const char *ti;
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} aligned_op, unaligned_op;
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/* Try to output the assembler code for an integer object whose
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value is given by X. SIZE is the size of the object in bytes and
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ALIGNED_P indicates whether it is aligned. Return true if
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successful. Only handles cases for which BYTE_OP, ALIGNED_OP
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and UNALIGNED_OP are NULL. */
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bool (* integer) (rtx x, unsigned int size, int aligned_p);
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/* Output code that will globalize a label. */
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void (* globalize_label) (FILE *, const char *);
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/* Output code that will emit a label for unwind info, if this
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target requires such labels. Second argument is the decl the
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unwind info is associated with, third is a boolean: true if
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this is for exception handling, fourth is a boolean: true if
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this is only a placeholder for an omitted FDE. */
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void (* unwind_label) (FILE *, tree, int, int);
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/* Output code that will emit a label to divide up the exception
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table. */
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void (* except_table_label) (FILE *);
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/* Emit any directives required to unwind this instruction. */
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void (* unwind_emit) (FILE *, rtx);
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/* Output an internal label. */
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void (* internal_label) (FILE *, const char *, unsigned long);
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/* Emit a ttype table reference to a typeinfo object. */
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bool (* ttype) (rtx);
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/* Emit an assembler directive to set visibility for the symbol
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associated with the tree decl. */
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void (* visibility) (tree, int);
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/* Output the assembler code for entry to a function. */
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void (* function_prologue) (FILE *, HOST_WIDE_INT);
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/* Output the assembler code for end of prologue. */
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void (* function_end_prologue) (FILE *);
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/* Output the assembler code for start of epilogue. */
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void (* function_begin_epilogue) (FILE *);
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/* Output the assembler code for function exit. */
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void (* function_epilogue) (FILE *, HOST_WIDE_INT);
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/* Initialize target-specific sections. */
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void (* init_sections) (void);
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/* Tell assembler to change to section NAME with attributes FLAGS.
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If DECL is non-NULL, it is the VAR_DECL or FUNCTION_DECL with
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which this section is associated. */
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void (* named_section) (const char *name, unsigned int flags, tree decl);
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/* Return a mask describing how relocations should be treated when
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selecting sections. Bit 1 should be set if global relocations
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should be placed in a read-write section; bit 0 should be set if
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local relocations should be placed in a read-write section. */
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int (*reloc_rw_mask) (void);
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/* Return a section for EXP. It may be a DECL or a constant. RELOC
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is nonzero if runtime relocations must be applied; bit 1 will be
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set if the runtime relocations require non-local name resolution.
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ALIGN is the required alignment of the data. */
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section *(* select_section) (tree, int, unsigned HOST_WIDE_INT);
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/* Return a section for X. MODE is X's mode and ALIGN is its
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alignment in bits. */
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section *(* select_rtx_section) (enum machine_mode, rtx,
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unsigned HOST_WIDE_INT);
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/* Select a unique section name for DECL. RELOC is the same as
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for SELECT_SECTION. */
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void (* unique_section) (tree, int);
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/* Return the readonly data section associated with function DECL. */
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section *(* function_rodata_section) (tree);
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/* Output a constructor for a symbol with a given priority. */
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void (* constructor) (rtx, int);
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/* Output a destructor for a symbol with a given priority. */
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void (* destructor) (rtx, int);
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/* Output the assembler code for a thunk function. THUNK_DECL is the
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declaration for the thunk function itself, FUNCTION is the decl for
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the target function. DELTA is an immediate constant offset to be
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added to THIS. If VCALL_OFFSET is nonzero, the word at
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*(*this + vcall_offset) should be added to THIS. */
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void (* output_mi_thunk) (FILE *file, tree thunk_decl,
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HOST_WIDE_INT delta, HOST_WIDE_INT vcall_offset,
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tree function_decl);
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/* Determine whether output_mi_thunk would succeed. */
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/* ??? Ideally, this hook would not exist, and success or failure
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would be returned from output_mi_thunk directly. But there's
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too much undo-able setup involved in invoking output_mi_thunk.
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Could be fixed by making output_mi_thunk emit rtl instead of
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text to the output file. */
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bool (* can_output_mi_thunk) (tree thunk_decl, HOST_WIDE_INT delta,
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HOST_WIDE_INT vcall_offset,
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tree function_decl);
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/* Output any boilerplate text needed at the beginning of a
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translation unit. */
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void (*file_start) (void);
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/* Output any boilerplate text needed at the end of a
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translation unit. */
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void (*file_end) (void);
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/* Output an assembler pseudo-op to declare a library function name
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external. */
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void (*external_libcall) (rtx);
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/* Output an assembler directive to mark decl live. This instructs
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linker to not dead code strip this symbol. */
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void (*mark_decl_preserved) (const char *);
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/* Output the definition of a section anchor. */
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void (*output_anchor) (rtx);
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/* Output a DTP-relative reference to a TLS symbol. */
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void (*output_dwarf_dtprel) (FILE *file, int size, rtx x);
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} asm_out;
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/* Functions relating to instruction scheduling. */
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struct sched
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{
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/* Given the current cost, COST, of an insn, INSN, calculate and
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return a new cost based on its relationship to DEP_INSN through
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the dependence LINK. The default is to make no adjustment. */
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int (* adjust_cost) (rtx insn, rtx link, rtx def_insn, int cost);
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/* Adjust the priority of an insn as you see fit. Returns the new
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priority. */
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int (* adjust_priority) (rtx, int);
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/* Function which returns the maximum number of insns that can be
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scheduled in the same machine cycle. This must be constant
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over an entire compilation. The default is 1. */
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int (* issue_rate) (void);
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/* Calculate how much this insn affects how many more insns we
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can emit this cycle. Default is they all cost the same. */
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int (* variable_issue) (FILE *, int, rtx, int);
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/* Initialize machine-dependent scheduling code. */
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void (* md_init) (FILE *, int, int);
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/* Finalize machine-dependent scheduling code. */
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void (* md_finish) (FILE *, int);
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/* Initialize machine-dependent function while scheduling code. */
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void (* md_init_global) (FILE *, int, int);
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/* Finalize machine-dependent function wide scheduling code. */
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void (* md_finish_global) (FILE *, int);
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/* Reorder insns in a machine-dependent fashion, in two different
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places. Default does nothing. */
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int (* reorder) (FILE *, int, rtx *, int *, int);
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int (* reorder2) (FILE *, int, rtx *, int *, int);
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/* The following member value is a pointer to a function called
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after evaluation forward dependencies of insns in chain given
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by two parameter values (head and tail correspondingly). */
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void (* dependencies_evaluation_hook) (rtx, rtx);
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/* The values of the following four members are pointers to
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functions used to simplify the automaton descriptions.
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dfa_pre_cycle_insn and dfa_post_cycle_insn give functions
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returning insns which are used to change the pipeline hazard
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recognizer state when the new simulated processor cycle
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correspondingly starts and finishes. The function defined by
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init_dfa_pre_cycle_insn and init_dfa_post_cycle_insn are used
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to initialize the corresponding insns. The default values of
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the members result in not changing the automaton state when
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the new simulated processor cycle correspondingly starts and
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finishes. */
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void (* init_dfa_pre_cycle_insn) (void);
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rtx (* dfa_pre_cycle_insn) (void);
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void (* init_dfa_post_cycle_insn) (void);
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rtx (* dfa_post_cycle_insn) (void);
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/* The following member value is a pointer to a function returning value
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which defines how many insns in queue `ready' will we try for
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multi-pass scheduling. If the member value is nonzero and the
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function returns positive value, the DFA based scheduler will make
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multi-pass scheduling for the first cycle. In other words, we will
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try to choose ready insn which permits to start maximum number of
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insns on the same cycle. */
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int (* first_cycle_multipass_dfa_lookahead) (void);
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/* The following member value is pointer to a function controlling
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what insns from the ready insn queue will be considered for the
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multipass insn scheduling. If the hook returns zero for insn
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passed as the parameter, the insn will be not chosen to be
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issued. */
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int (* first_cycle_multipass_dfa_lookahead_guard) (rtx);
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/* The following member value is pointer to a function called by
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the insn scheduler before issuing insn passed as the third
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parameter on given cycle. If the hook returns nonzero, the
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insn is not issued on given processors cycle. Instead of that,
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the processor cycle is advanced. If the value passed through
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the last parameter is zero, the insn ready queue is not sorted
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on the new cycle start as usually. The first parameter passes
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file for debugging output. The second one passes the scheduler
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verbose level of the debugging output. The forth and the fifth
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parameter values are correspondingly processor cycle on which
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the previous insn has been issued and the current processor
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cycle. */
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int (* dfa_new_cycle) (FILE *, int, rtx, int, int, int *);
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/* The following member value is a pointer to a function called
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by the insn scheduler. It should return true if there exists a
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dependence which is considered costly by the target, between
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the insn passed as the first parameter, and the insn passed as
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the second parameter. The third parameter is the INSN_DEPEND
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link that represents the dependence between the two insns. The
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fourth argument is the cost of the dependence as estimated by
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the scheduler. The last argument is the distance in cycles
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between the already scheduled insn (first parameter) and the
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the second insn (second parameter). */
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bool (* is_costly_dependence) (rtx, rtx, rtx, int, int);
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/* Given the current cost, COST, of an insn, INSN, calculate and
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return a new cost based on its relationship to DEP_INSN through the
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dependence of type DEP_TYPE. The default is to make no adjustment. */
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int (* adjust_cost_2) (rtx insn, int, rtx def_insn, int cost);
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/* The following member value is a pointer to a function called
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by the insn scheduler. This hook is called to notify the backend
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that new instructions were emitted. */
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void (* h_i_d_extended) (void);
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/* The following member value is a pointer to a function called
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by the insn scheduler.
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The first parameter is an instruction, the second parameter is the type
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of the requested speculation, and the third parameter is a pointer to the
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speculative pattern of the corresponding type (set if return value == 1).
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It should return
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-1, if there is no pattern, that will satisfy the requested speculation
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type,
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0, if current pattern satisfies the requested speculation type,
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1, if pattern of the instruction should be changed to the newly
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generated one. */
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int (* speculate_insn) (rtx, int, rtx *);
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/* The following member value is a pointer to a function called
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by the insn scheduler. It should return true if the check instruction
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corresponding to the instruction passed as the parameter needs a
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recovery block. */
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bool (* needs_block_p) (rtx);
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/* The following member value is a pointer to a function called
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by the insn scheduler. It should return a pattern for the check
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instruction.
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The first parameter is a speculative instruction, the second parameter
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is the label of the corresponding recovery block (or null, if it is a
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simple check). If the mutation of the check is requested (e.g. from
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ld.c to chk.a), the third parameter is true - in this case the first
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parameter is the previous check. */
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rtx (* gen_check) (rtx, rtx, bool);
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/* The following member value is a pointer to a function controlling
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what insns from the ready insn queue will be considered for the
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multipass insn scheduling. If the hook returns zero for the insn
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passed as the parameter, the insn will not be chosen to be
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issued. This hook is used to discard speculative instructions,
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that stand at the first position of the ready list. */
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bool (* first_cycle_multipass_dfa_lookahead_guard_spec) (rtx);
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/* The following member value is a pointer to a function that provides
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information about the speculation capabilities of the target.
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The parameter is a pointer to spec_info variable. */
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void (* set_sched_flags) (struct spec_info_def *);
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} sched;
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/* Functions relating to vectorization. */
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struct vectorize
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{
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/* The following member value is a pointer to a function called
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by the vectorizer, and return the decl of the target builtin
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function. */
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tree (* builtin_mask_for_load) (void);
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} vectorize;
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/* The initial value of target_flags. */
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int default_target_flags;
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/* Handle target switch CODE (an OPT_* value). ARG is the argument
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passed to the switch; it is NULL if no argument was. VALUE is the
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value of ARG if CODE specifies a UInteger option, otherwise it is
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1 if the positive form of the switch was used and 0 if the negative
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form was. Return true if the switch was valid. */
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bool (* handle_option) (size_t code, const char *arg, int value);
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/* Return machine mode for filter value. */
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enum machine_mode (* eh_return_filter_mode) (void);
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/* Given two decls, merge their attributes and return the result. */
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tree (* merge_decl_attributes) (tree, tree);
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/* Given two types, merge their attributes and return the result. */
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tree (* merge_type_attributes) (tree, tree);
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/* Table of machine attributes and functions to handle them.
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Ignored if NULL. */
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const struct attribute_spec *attribute_table;
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/* Return zero if the attributes on TYPE1 and TYPE2 are incompatible,
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one if they are compatible and two if they are nearly compatible
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(which causes a warning to be generated). */
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int (* comp_type_attributes) (tree type1, tree type2);
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/* Assign default attributes to the newly defined TYPE. */
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void (* set_default_type_attributes) (tree type);
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/* Insert attributes on the newly created DECL. */
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void (* insert_attributes) (tree decl, tree *attributes);
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/* Return true if FNDECL (which has at least one machine attribute)
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can be inlined despite its machine attributes, false otherwise. */
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bool (* function_attribute_inlinable_p) (tree fndecl);
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/* Return true if bitfields in RECORD_TYPE should follow the
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Microsoft Visual C++ bitfield layout rules. */
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bool (* ms_bitfield_layout_p) (tree record_type);
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/* True if the target supports decimal floating point. */
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bool (* decimal_float_supported_p) (void);
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/* Return true if anonymous bitfields affect structure alignment. */
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bool (* align_anon_bitfield) (void);
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/* Return true if volatile bitfields should use the narrowest type possible.
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Return false if they should use the container type. */
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bool (* narrow_volatile_bitfield) (void);
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/* Set up target-specific built-in functions. */
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void (* init_builtins) (void);
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/* Expand a target-specific builtin. */
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rtx (* expand_builtin) (tree exp, rtx target, rtx subtarget,
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enum machine_mode mode, int ignore);
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/* Select a replacement for a target-specific builtin. This is done
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*before* regular type checking, and so allows the target to implement
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a crude form of function overloading. The result is a complete
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expression that implements the operation. */
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tree (*resolve_overloaded_builtin) (tree decl, tree params);
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/* Fold a target-specific builtin. */
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tree (* fold_builtin) (tree fndecl, tree arglist, bool ignore);
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/* For a vendor-specific fundamental TYPE, return a pointer to
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a statically-allocated string containing the C++ mangling for
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TYPE. In all other cases, return NULL. */
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const char * (* mangle_fundamental_type) (tree type);
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/* Make any adjustments to libfunc names needed for this target. */
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void (* init_libfuncs) (void);
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/* Given a decl, a section name, and whether the decl initializer
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has relocs, choose attributes for the section. */
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/* ??? Should be merged with SELECT_SECTION and UNIQUE_SECTION. */
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unsigned int (* section_type_flags) (tree, const char *, int);
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/* True if new jumps cannot be created, to replace existing ones or
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not, at the current point in the compilation. */
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bool (* cannot_modify_jumps_p) (void);
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/* Return a register class for which branch target register
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optimizations should be applied. */
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int (* branch_target_register_class) (void);
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/* 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) (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) (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, 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) (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);
|
|
|
|
/* True if EXP should be placed in a "small data" section. */
|
|
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) (tree);
|
|
|
|
/* 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);
|
|
|
|
/* 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) (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);
|
|
|
|
/* Return where to allocate pseudo for a given hard register initial
|
|
value. */
|
|
rtx (* allocate_initial_value) (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);
|
|
|
|
/* 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) (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);
|
|
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);
|
|
|
|
/* 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) (tree ret_type, tree fn_decl_or_type,
|
|
bool outgoing);
|
|
|
|
/* Return an rtx for the argument pointer incoming to the
|
|
current function. */
|
|
rtx (*internal_arg_pointer) (void);
|
|
} 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);
|
|
|
|
/* 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 *);
|
|
|
|
/* 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);
|
|
/* 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;
|
|
|
|
/* 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 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 */
|