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- /* Declarations for insn-output.c and other code to write to asm_out_file.
- These functions are defined in final.c, and varasm.c.
- Copyright (C) 1987-2019 Free Software Foundation, Inc.
- This file is part of GCC.
- GCC is free software; you can redistribute it and/or modify it under
- the terms of the GNU General Public License as published by the Free
- Software Foundation; either version 3, or (at your option) any later
- version.
- GCC is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or
- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- for more details.
- You should have received a copy of the GNU General Public License
- along with GCC; see the file COPYING3. If not see
- <http://www.gnu.org/licenses/>. */
- #ifndef GCC_OUTPUT_H
- #define GCC_OUTPUT_H
- /* Initialize data in final at the beginning of a compilation. */
- extern void init_final (const char *);
- /* Enable APP processing of subsequent output.
- Used before the output from an `asm' statement. */
- extern void app_enable (void);
- /* Disable APP processing of subsequent output.
- Called from varasm.c before most kinds of output. */
- extern void app_disable (void);
- /* Return the number of slots filled in the current
- delayed branch sequence (we don't count the insn needing the
- delay slot). Zero if not in a delayed branch sequence. */
- extern int dbr_sequence_length (void);
- /* Indicate that branch shortening hasn't yet been done. */
- extern void init_insn_lengths (void);
- /* Obtain the current length of an insn. If branch shortening has been done,
- get its actual length. Otherwise, get its maximum length. */
- extern int get_attr_length (rtx_insn *);
- /* Obtain the current length of an insn. If branch shortening has been done,
- get its actual length. Otherwise, get its minimum length. */
- extern int get_attr_min_length (rtx_insn *);
- /* Make a pass over all insns and compute their actual lengths by shortening
- any branches of variable length if possible. */
- extern void shorten_branches (rtx_insn *);
- const char *get_some_local_dynamic_name ();
- /* Output assembler code for the start of a function,
- and initialize some of the variables in this file
- for the new function. The label for the function and associated
- assembler pseudo-ops have already been output in
- `assemble_start_function'. */
- extern void final_start_function (rtx_insn *, FILE *, int);
- /* Output assembler code for the end of a function.
- For clarity, args are same as those of `final_start_function'
- even though not all of them are needed. */
- extern void final_end_function (void);
- /* Output assembler code for some insns: all or part of a function. */
- extern void final (rtx_insn *, FILE *, int);
- /* The final scan for one insn, INSN. Args are same as in `final', except
- that INSN is the insn being scanned. Value returned is the next insn to
- be scanned. */
- extern rtx_insn *final_scan_insn (rtx_insn *, FILE *, int, int, int *);
- /* Replace a SUBREG with a REG or a MEM, based on the thing it is a
- subreg of. */
- extern rtx alter_subreg (rtx *, bool);
- /* Print an operand using machine-dependent assembler syntax. */
- extern void output_operand (rtx, int);
- /* Report inconsistency between the assembler template and the operands.
- In an `asm', it's the user's fault; otherwise, the compiler's fault. */
- extern void output_operand_lossage (const char *, ...) ATTRIBUTE_PRINTF_1;
- /* Output a string of assembler code, substituting insn operands.
- Defined in final.c. */
- extern void output_asm_insn (const char *, rtx *);
- /* Compute a worst-case reference address of a branch so that it
- can be safely used in the presence of aligned labels.
- Defined in final.c. */
- extern int insn_current_reference_address (rtx_insn *);
- /* Find the alignment associated with a CODE_LABEL.
- Defined in final.c. */
- extern align_flags label_to_alignment (rtx);
- /* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol. */
- extern void output_asm_label (rtx);
- /* Marks SYMBOL_REFs in x as referenced through use of assemble_external. */
- extern void mark_symbol_refs_as_used (rtx);
- /* Print a memory reference operand for address X with access mode MODE
- using machine-dependent assembler syntax. */
- extern void output_address (machine_mode, rtx);
- /* Print an integer constant expression in assembler syntax.
- Addition and subtraction are the only arithmetic
- that may appear in these expressions. */
- extern void output_addr_const (FILE *, rtx);
- /* Output a string of assembler code, substituting numbers, strings
- and fixed syntactic prefixes. */
- #if GCC_VERSION >= 3004
- #define ATTRIBUTE_ASM_FPRINTF(m, n) __attribute__ ((__format__ (__asm_fprintf__, m, n))) ATTRIBUTE_NONNULL(m)
- #else
- #define ATTRIBUTE_ASM_FPRINTF(m, n) ATTRIBUTE_NONNULL(m)
- #endif
- extern void fprint_whex (FILE *, unsigned HOST_WIDE_INT);
- extern void fprint_ul (FILE *, unsigned long);
- extern int sprint_ul (char *, unsigned long);
- extern void asm_fprintf (FILE *file, const char *p, ...)
- ATTRIBUTE_ASM_FPRINTF(2, 3);
- /* Return nonzero if this function has no function calls. */
- extern int leaf_function_p (void);
- /* Return 1 if branch is a forward branch.
- Uses insn_shuid array, so it works only in the final pass. May be used by
- output templates to add branch prediction hints, for example. */
- extern int final_forward_branch_p (rtx_insn *);
- /* Return 1 if this function uses only the registers that can be
- safely renumbered. */
- extern int only_leaf_regs_used (void);
- /* Scan IN_RTX and its subexpressions, and renumber all regs into those
- available in leaf functions. */
- extern void leaf_renumber_regs_insn (rtx);
- /* Locate the proper template for the given insn-code. */
- extern const char *get_insn_template (int, rtx_insn *);
- /* Functions in varasm.c. */
- /* Emit any pending weak declarations. */
- extern void weak_finish (void);
- /* Decode an `asm' spec for a declaration as a register name.
- Return the register number, or -1 if nothing specified,
- or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
- or -3 if ASMSPEC is `cc' and is not recognized,
- or -4 if ASMSPEC is `memory' and is not recognized.
- Accept an exact spelling or a decimal number.
- Prefixes such as % are optional. */
- extern int decode_reg_name (const char *);
- /* Similar to decode_reg_name, but takes an extra parameter that is a
- pointer to the number of (internal) registers described by the
- external name. */
- extern int decode_reg_name_and_count (const char *, int *);
- extern void do_assemble_alias (tree, tree);
- extern void default_assemble_visibility (tree, int);
- /* Output a string of literal assembler code
- for an `asm' keyword used between functions. */
- extern void assemble_asm (tree);
- /* Get the function's name from a decl, as described by its RTL. */
- extern const char *get_fnname_from_decl (tree);
- /* Output assembler code for the constant pool of a function and associated
- with defining the name of the function. DECL describes the function.
- NAME is the function's name. For the constant pool, we use the current
- constant pool data. */
- extern void assemble_start_function (tree, const char *);
- /* Output assembler code associated with defining the size of the
- function. DECL describes the function. NAME is the function's name. */
- extern void assemble_end_function (tree, const char *);
- /* Assemble everything that is needed for a variable or function declaration.
- Not used for automatic variables, and not used for function definitions.
- Should not be called for variables of incomplete structure type.
- TOP_LEVEL is nonzero if this variable has file scope.
- AT_END is nonzero if this is the special handling, at end of compilation,
- to define things that have had only tentative definitions.
- DONT_OUTPUT_DATA if nonzero means don't actually output the
- initial value (that will be done by the caller). */
- extern void assemble_variable (tree, int, int, int);
- /* Put the vtable verification constructor initialization function
- into the preinit array. */
- extern void assemble_vtv_preinit_initializer (tree);
- /* Assemble everything that is needed for a variable declaration that has
- no definition in the current translation unit. */
- extern void assemble_undefined_decl (tree);
- /* Compute the alignment of variable specified by DECL.
- DONT_OUTPUT_DATA is from assemble_variable. */
- extern void align_variable (tree decl, bool dont_output_data);
- /* Queue for outputting something to declare an external symbol to the
- assembler. (Most assemblers don't need this, so we normally output
- nothing.) Do nothing if DECL is not external. */
- extern void assemble_external (tree);
- /* Assemble code to leave SIZE bytes of zeros. */
- extern void assemble_zeros (unsigned HOST_WIDE_INT);
- /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
- extern void assemble_align (unsigned int);
- /* Assemble a string constant with the specified C string as contents. */
- extern void assemble_string (const char *, int);
- /* Similar, for calling a library function FUN. */
- extern void assemble_external_libcall (rtx);
- /* Assemble a label named NAME. */
- extern void assemble_label (FILE *, const char *);
- /* Output to FILE (an assembly file) a reference to NAME. If NAME
- starts with a *, the rest of NAME is output verbatim. Otherwise
- NAME is transformed in a target-specific way (usually by the
- addition of an underscore). */
- extern void assemble_name_raw (FILE *, const char *);
- /* Return NAME that should actually be emitted, looking through
- transparent aliases. If NAME refers to an entity that is also
- represented as a tree (like a function or variable), mark the entity
- as referenced. */
- extern const char *assemble_name_resolve (const char *);
- /* Like assemble_name_raw, but should be used when NAME might refer to
- an entity that is also represented as a tree (like a function or
- variable). If NAME does refer to such an entity, that entity will
- be marked as referenced. */
- extern void assemble_name (FILE *, const char *);
- /* Return the assembler directive for creating a given kind of integer
- object. SIZE is the number of bytes in the object and ALIGNED_P
- indicates whether it is known to be aligned. Return NULL if the
- assembly dialect has no such directive.
- The returned string should be printed at the start of a new line and
- be followed immediately by the object's initial value. */
- extern const char *integer_asm_op (int, int);
- /* Use directive OP to assemble an integer object X. Print OP at the
- start of the line, followed immediately by the value of X. */
- extern void assemble_integer_with_op (const char *, rtx);
- /* The default implementation of the asm_out.integer target hook. */
- extern bool default_assemble_integer (rtx, unsigned int, int);
- /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
- the alignment of the integer in bits. Return 1 if we were able to output
- the constant, otherwise 0. If FORCE is nonzero the constant must
- be outputable. */
- extern bool assemble_integer (rtx, unsigned, unsigned, int);
- /* Return section for TEXT_SECITON_NAME if DECL or DECL_SECTION_NAME (DECL)
- is NULL. */
- extern section *get_named_text_section (tree, const char *, const char *);
- /* An interface to assemble_integer for the common case in which a value is
- fully aligned and must be printed. VALUE is the value of the integer
- object and SIZE is the number of bytes it contains. */
- #define assemble_aligned_integer(SIZE, VALUE) \
- assemble_integer (VALUE, SIZE, (SIZE) * BITS_PER_UNIT, 1)
- /* Assemble the floating-point constant D into an object of size MODE. ALIGN
- is the alignment of the constant in bits. If REVERSE is true, D is output
- in reverse storage order. */
- extern void assemble_real (REAL_VALUE_TYPE, scalar_float_mode, unsigned,
- bool = false);
- /* Write the address of the entity given by SYMBOL to SEC. */
- extern void assemble_addr_to_section (rtx, section *);
- /* Return TRUE if and only if the constant pool has no entries. Note
- that even entries we might end up choosing not to emit are counted
- here, so there is the potential for missed optimizations. */
- extern bool constant_pool_empty_p (void);
- extern rtx_insn *peephole (rtx_insn *);
- extern void output_shared_constant_pool (void);
- extern void output_object_blocks (void);
- extern void output_quoted_string (FILE *, const char *);
- /* When outputting delayed branch sequences, this rtx holds the
- sequence being output. It is null when no delayed branch
- sequence is being output, so it can be used as a test in the
- insn output code.
- This variable is defined in final.c. */
- extern rtx_sequence *final_sequence;
- /* File in which assembler code is being written. */
- #ifdef BUFSIZ
- extern FILE *asm_out_file;
- #endif
- /* The first global object in the file. */
- extern const char *first_global_object_name;
- /* The first weak object in the file. */
- extern const char *weak_global_object_name;
- /* Nonnull if the insn currently being emitted was a COND_EXEC pattern. */
- extern rtx current_insn_predicate;
- /* Last insn processed by final_scan_insn. */
- extern rtx_insn *current_output_insn;
- /* Nonzero while outputting an `asm' with operands.
- This means that inconsistencies are the user's fault, so don't die.
- The precise value is the insn being output, to pass to error_for_asm. */
- extern const rtx_insn *this_is_asm_operands;
- /* Carry information from ASM_DECLARE_OBJECT_NAME
- to ASM_FINISH_DECLARE_OBJECT. */
- extern int size_directive_output;
- extern tree last_assemble_variable_decl;
- extern bool first_function_block_is_cold;
- /* Decide whether DECL needs to be in a writable section.
- RELOC is the same as for SELECT_SECTION. */
- extern bool decl_readonly_section (const_tree, int);
- /* This can be used to compute RELOC for the function above, when
- given a constant expression. */
- extern int compute_reloc_for_constant (tree);
- /* User label prefix in effect for this compilation. */
- extern const char *user_label_prefix;
- /* Default target function prologue and epilogue assembler output. */
- extern void default_function_pro_epilogue (FILE *);
- /* Default target function switched text sections. */
- extern void default_function_switched_text_sections (FILE *, tree, bool);
- /* Default target hook that outputs nothing to a stream. */
- extern void no_asm_to_stream (FILE *);
- /* Flags controlling properties of a section. */
- #define SECTION_ENTSIZE 0x000ff /* entity size in section */
- #define SECTION_CODE 0x00100 /* contains code */
- #define SECTION_WRITE 0x00200 /* data is writable */
- #define SECTION_DEBUG 0x00400 /* contains debug data */
- #define SECTION_LINKONCE 0x00800 /* is linkonce */
- #define SECTION_SMALL 0x01000 /* contains "small data" */
- #define SECTION_BSS 0x02000 /* contains zeros only */
- #define SECTION_FORGET 0x04000 /* forget that we've entered the section */
- #define SECTION_MERGE 0x08000 /* contains mergeable data */
- #define SECTION_STRINGS 0x10000 /* contains zero terminated strings without
- embedded zeros */
- #define SECTION_OVERRIDE 0x20000 /* allow override of default flags */
- #define SECTION_TLS 0x40000 /* contains thread-local storage */
- #define SECTION_NOTYPE 0x80000 /* don't output @progbits */
- #define SECTION_DECLARED 0x100000 /* section has been used */
- #define SECTION_STYLE_MASK 0x600000 /* bits used for SECTION_STYLE */
- #define SECTION_COMMON 0x800000 /* contains common data */
- #define SECTION_RELRO 0x1000000 /* data is readonly after relocation processing */
- #define SECTION_EXCLUDE 0x2000000 /* discarded by the linker */
- #define SECTION_MACH_DEP 0x4000000 /* subsequent bits reserved for target */
- /* This SECTION_STYLE is used for unnamed sections that we can switch
- to using a special assembler directive. */
- #define SECTION_UNNAMED 0x000000
- /* This SECTION_STYLE is used for named sections that we can switch
- to using a general section directive. */
- #define SECTION_NAMED 0x200000
- /* This SECTION_STYLE is used for sections that we cannot switch to at
- all. The choice of section is implied by the directive that we use
- to declare the object. */
- #define SECTION_NOSWITCH 0x400000
- /* A helper function for default_elf_select_section and
- default_elf_unique_section. Categorizes the DECL. */
- enum section_category
- {
- SECCAT_TEXT,
- SECCAT_RODATA,
- SECCAT_RODATA_MERGE_STR,
- SECCAT_RODATA_MERGE_STR_INIT,
- SECCAT_RODATA_MERGE_CONST,
- SECCAT_SRODATA,
- SECCAT_DATA,
- /* To optimize loading of shared programs, define following subsections
- of data section:
- _REL Contains data that has relocations, so they get grouped
- together and dynamic linker will visit fewer pages in memory.
- _RO Contains data that is otherwise read-only. This is useful
- with prelinking as most relocations won't be dynamically
- linked and thus stay read only.
- _LOCAL Marks data containing relocations only to local objects.
- These relocations will get fully resolved by prelinking. */
- SECCAT_DATA_REL,
- SECCAT_DATA_REL_LOCAL,
- SECCAT_DATA_REL_RO,
- SECCAT_DATA_REL_RO_LOCAL,
- SECCAT_SDATA,
- SECCAT_TDATA,
- SECCAT_BSS,
- SECCAT_SBSS,
- SECCAT_TBSS
- };
- /* Information that is provided by all instances of the section type. */
- struct GTY(()) section_common {
- /* The set of SECTION_* flags that apply to this section. */
- unsigned int flags;
- };
- /* Information about a SECTION_NAMED section. */
- struct GTY(()) named_section {
- struct section_common common;
- /* The name of the section. */
- const char *name;
- /* If nonnull, the VAR_DECL or FUNCTION_DECL with which the
- section is associated. */
- tree decl;
- };
- /* A callback that writes the assembly code for switching to an unnamed
- section. The argument provides callback-specific data. */
- typedef void (*unnamed_section_callback) (const void *);
- /* Information about a SECTION_UNNAMED section. */
- struct GTY(()) unnamed_section {
- struct section_common common;
- /* The callback used to switch to the section, and the data that
- should be passed to the callback. */
- unnamed_section_callback GTY ((skip)) callback;
- const void *GTY ((skip)) data;
- /* The next entry in the chain of unnamed sections. */
- section *next;
- };
- /* A callback that writes the assembly code for a decl in a
- SECTION_NOSWITCH section. DECL is the decl that should be assembled
- and NAME is the name of its SYMBOL_REF. SIZE is the size of the decl
- in bytes and ROUNDED is that size rounded up to the next
- BIGGEST_ALIGNMENT / BITS_PER_UNIT boundary.
- Return true if the callback used DECL_ALIGN to set the object's
- alignment. A false return value implies that we are relying
- on the rounded size to align the decl. */
- typedef bool (*noswitch_section_callback) (tree decl, const char *name,
- unsigned HOST_WIDE_INT size,
- unsigned HOST_WIDE_INT rounded);
- /* Information about a SECTION_NOSWITCH section. */
- struct GTY(()) noswitch_section {
- struct section_common common;
- /* The callback used to assemble decls in this section. */
- noswitch_section_callback GTY ((skip)) callback;
- };
- /* Information about a section, which may be named or unnamed. */
- union GTY ((desc ("SECTION_STYLE (&(%h))"), for_user)) section {
- struct section_common GTY ((skip)) common;
- struct named_section GTY ((tag ("SECTION_NAMED"))) named;
- struct unnamed_section GTY ((tag ("SECTION_UNNAMED"))) unnamed;
- struct noswitch_section GTY ((tag ("SECTION_NOSWITCH"))) noswitch;
- };
- /* Return the style of section SECT. */
- #define SECTION_STYLE(SECT) ((SECT)->common.flags & SECTION_STYLE_MASK)
- struct object_block;
- /* Special well-known sections. */
- extern GTY(()) section *text_section;
- extern GTY(()) section *data_section;
- extern GTY(()) section *readonly_data_section;
- extern GTY(()) section *sdata_section;
- extern GTY(()) section *ctors_section;
- extern GTY(()) section *dtors_section;
- extern GTY(()) section *bss_section;
- extern GTY(()) section *sbss_section;
- extern GTY(()) section *exception_section;
- extern GTY(()) section *eh_frame_section;
- extern GTY(()) section *tls_comm_section;
- extern GTY(()) section *comm_section;
- extern GTY(()) section *lcomm_section;
- extern GTY(()) section *bss_noswitch_section;
- extern GTY(()) section *in_section;
- extern GTY(()) bool in_cold_section_p;
- extern section *get_unnamed_section (unsigned int, void (*) (const void *),
- const void *);
- extern section *get_section (const char *, unsigned int, tree);
- extern section *get_named_section (tree, const char *, int);
- extern section *get_variable_section (tree, bool);
- extern void place_block_symbol (rtx);
- extern rtx get_section_anchor (struct object_block *, HOST_WIDE_INT,
- enum tls_model);
- extern section *mergeable_constant_section (machine_mode,
- unsigned HOST_WIDE_INT,
- unsigned int);
- extern section *function_section (tree);
- extern section *unlikely_text_section (void);
- extern section *current_function_section (void);
- extern void switch_to_other_text_partition (void);
- /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
- not) section for PRIORITY. */
- extern section *get_cdtor_priority_section (int, bool);
- extern bool unlikely_text_section_p (section *);
- extern void switch_to_section (section *);
- extern void output_section_asm_op (const void *);
- extern void record_tm_clone_pair (tree, tree);
- extern void finish_tm_clone_pairs (void);
- extern tree get_tm_clone_pair (tree);
- extern void default_asm_output_source_filename (FILE *, const char *);
- extern void output_file_directive (FILE *, const char *);
- extern unsigned int default_section_type_flags (tree, const char *, int);
- extern bool have_global_bss_p (void);
- extern bool bss_initializer_p (const_tree, bool = false);
- extern void default_no_named_section (const char *, unsigned int, tree);
- extern void default_elf_asm_named_section (const char *, unsigned int, tree);
- extern enum section_category categorize_decl_for_section (const_tree, int);
- extern void default_coff_asm_named_section (const char *, unsigned int, tree);
- extern void default_pe_asm_named_section (const char *, unsigned int, tree);
- extern void default_named_section_asm_out_destructor (rtx, int);
- extern void default_dtor_section_asm_out_destructor (rtx, int);
- extern void default_named_section_asm_out_constructor (rtx, int);
- extern void default_ctor_section_asm_out_constructor (rtx, int);
- extern section *default_select_section (tree, int, unsigned HOST_WIDE_INT);
- extern section *default_elf_select_section (tree, int, unsigned HOST_WIDE_INT);
- extern void default_unique_section (tree, int);
- extern section *default_function_rodata_section (tree);
- extern section *default_no_function_rodata_section (tree);
- extern section *default_clone_table_section (void);
- extern section *default_select_rtx_section (machine_mode, rtx,
- unsigned HOST_WIDE_INT);
- extern section *default_elf_select_rtx_section (machine_mode, rtx,
- unsigned HOST_WIDE_INT);
- extern void default_encode_section_info (tree, rtx, int);
- extern const char *default_strip_name_encoding (const char *);
- extern void default_asm_output_anchor (rtx);
- extern bool default_use_anchors_for_symbol_p (const_rtx);
- extern bool default_binds_local_p (const_tree);
- extern bool default_binds_local_p_1 (const_tree, int);
- extern bool default_binds_local_p_2 (const_tree);
- extern bool default_binds_local_p_3 (const_tree, bool, bool, bool, bool);
- extern void default_globalize_label (FILE *, const char *);
- extern void default_globalize_decl_name (FILE *, tree);
- extern void default_emit_unwind_label (FILE *, tree, int, int);
- extern void default_emit_except_table_label (FILE *);
- extern void default_generate_internal_label (char *, const char *,
- unsigned long);
- extern void default_internal_label (FILE *, const char *, unsigned long);
- extern void default_asm_declare_constant_name (FILE *, const char *,
- const_tree, HOST_WIDE_INT);
- extern void default_file_start (void);
- extern void file_end_indicate_exec_stack (void);
- extern void file_end_indicate_split_stack (void);
- extern void default_elf_asm_output_external (FILE *file, tree,
- const char *);
- extern void default_elf_asm_output_limited_string (FILE *, const char *);
- extern void default_elf_asm_output_ascii (FILE *, const char *, unsigned int);
- extern void default_elf_internal_label (FILE *, const char *, unsigned long);
- extern void default_elf_init_array_asm_out_constructor (rtx, int);
- extern void default_elf_fini_array_asm_out_destructor (rtx, int);
- extern int maybe_assemble_visibility (tree);
- extern int default_address_cost (rtx, machine_mode, addr_space_t, bool);
- /* Output stack usage information. */
- extern void output_stack_usage (void);
- #endif /* ! GCC_OUTPUT_H */
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