expr.h

gcc库的原代码,对编程有很大帮助.


/* Functions from expmed.c:  */

/* Arguments MODE, RTX: return an rtx for the negation of that value.
   May emit insns.  */
extern rtx negate_rtx PROTO((enum machine_mode, rtx));

/* Expand a logical AND operation.  */
extern rtx expand_and PROTO((rtx, rtx, rtx));

/* Emit a store-flag operation.  */
extern rtx emit_store_flag PROTO((rtx, enum rtx_code, rtx, rtx,
				  enum machine_mode, int, int));

/* Functions from loop.c:  */

/* Given a JUMP_INSN, return a description of the test being made.  */
extern rtx get_condition PROTO((rtx, rtx *));

/* Functions from expr.c:  */

/* This is run once per compilation to set up which modes can be used
   directly in memory and to initialize the block move optab.  */
extern void init_expr_once PROTO((void));

/* This is run at the start of compiling a function.  */
extern void init_expr PROTO((void));

/* Use protect_from_queue to convert a QUEUED expression
   into something that you can put immediately into an instruction.  */
extern rtx protect_from_queue PROTO((rtx, int));

/* Perform all the pending incrementations.  */
extern void emit_queue PROTO((void));

/* Emit some rtl insns to move data between rtx's, converting machine modes.
   Both modes must be floating or both fixed.  */
extern void convert_move PROTO((rtx, rtx, int));

/* Convert an rtx to specified machine mode and return the result.  */
extern rtx convert_to_mode PROTO((enum machine_mode, rtx, int));

/* Convert an rtx to MODE from OLDMODE and return the result.  */
extern rtx convert_modes PROTO((enum machine_mode, enum machine_mode, rtx, int));

/* Emit code to move a block Y to a block X.  */
extern void emit_block_move PROTO((rtx, rtx, rtx, int));

/* Copy all or part of a value X into registers starting at REGNO.
   The number of registers to be filled is NREGS.  */
extern void move_block_to_reg PROTO((int, rtx, int, enum machine_mode));

/* Copy all or part of a BLKmode value X out of registers starting at REGNO.
   The number of registers to be filled is NREGS.  */
extern void move_block_from_reg PROTO((int, rtx, int, int));

/* Mark REG as holding a parameter for the next CALL_INSN.  */
extern void use_reg PROTO((rtx*, rtx));
/* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
   for the next CALL_INSN.  */
extern void use_regs PROTO((rtx*, int, int));

/* Write zeros through the storage of OBJECT.
   If OBJECT has BLKmode, SIZE is its length in bytes.  */
extern void clear_storage PROTO((rtx, rtx));

/* Emit insns to set X from Y.  */
extern rtx emit_move_insn PROTO((rtx, rtx));

/* Emit insns to set X from Y, with no frills.  */
extern rtx emit_move_insn_1 PROTO ((rtx, rtx));

/* Push a block of length SIZE (perhaps variable)
   and return an rtx to address the beginning of the block.  */
extern rtx push_block PROTO((rtx, int, int));

/* Make an operand to push something on the stack.  */
extern rtx gen_push_operand PROTO((void));

#ifdef TREE_CODE
/* Generate code to push something onto the stack, given its mode and type.  */
extern void emit_push_insn PROTO((rtx, enum machine_mode, tree, rtx, int,
				  int, rtx, int, rtx, rtx));

/* Emit library call.  */
extern void emit_library_call PVPROTO((rtx orgfun, int no_queue,
  enum machine_mode outmode, int nargs, ...));
extern rtx emit_library_call_value PVPROTO((rtx orgfun, rtx value, int no_queue,
  enum machine_mode outmode, int nargs, ...));

/* Expand an assignment that stores the value of FROM into TO. */
extern rtx expand_assignment PROTO((tree, tree, int, int));

/* Generate code for computing expression EXP,
   and storing the value into TARGET.
   If SUGGEST_REG is nonzero, copy the value through a register
   and return that register, if that is possible.  */
extern rtx store_expr PROTO((tree, rtx, int));
#endif

/* Given an rtx that may include add and multiply operations,
   generate them as insns and return a pseudo-reg containing the value.
   Useful after calling expand_expr with 1 as sum_ok.  */
extern rtx force_operand PROTO((rtx, rtx));

#ifdef TREE_CODE
/* Generate code for computing expression EXP.
   An rtx for the computed value is returned.  The value is never null.
   In the case of a void EXP, const0_rtx is returned.  */
extern rtx expand_expr PROTO((tree, rtx, enum machine_mode,
			      enum expand_modifier));
#endif

/* At the start of a function, record that we have no previously-pushed
   arguments waiting to be popped.  */
extern void init_pending_stack_adjust PROTO((void));

/* When exiting from function, if safe, clear out any pending stack adjust
   so the adjustment won't get done.  */
extern void clear_pending_stack_adjust PROTO((void));

/* Pop any previously-pushed arguments that have not been popped yet.  */
extern void do_pending_stack_adjust PROTO((void));

#ifdef TREE_CODE
/* Expand all cleanups up to OLD_CLEANUPS.  */
extern void expand_cleanups_to PROTO((tree));

/* Generate code to evaluate EXP and jump to LABEL if the value is zero.  */
extern void jumpifnot PROTO((tree, rtx));

/* Generate code to evaluate EXP and jump to LABEL if the value is nonzero.  */
extern void jumpif PROTO((tree, rtx));

/* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
   the result is zero, or IF_TRUE_LABEL if the result is one.  */
extern void do_jump PROTO((tree, rtx, rtx));
#endif

/* Generate rtl to compare two rtx's, will call emit_cmp_insn.  */
extern rtx compare_from_rtx PROTO((rtx, rtx, enum rtx_code, int,
				   enum machine_mode, rtx, int));

/* Generate a tablejump instruction (used for switch statements).  */
extern void do_tablejump PROTO((rtx, enum machine_mode, rtx, rtx, rtx));

#ifdef TREE_CODE
/* rtl.h and tree.h were included.  */
/* Return an rtx for the size in bytes of the value of an expr.  */
extern rtx expr_size PROTO((tree));

extern rtx lookup_static_chain PROTO((tree));

/* Convert a stack slot address ADDR valid in function FNDECL
   into an address valid in this function (using a static chain).  */
extern rtx fix_lexical_addr PROTO((rtx, tree));

/* Return the address of the trampoline for entering nested fn FUNCTION.  */
extern rtx trampoline_address PROTO((tree));

/* Return an rtx that refers to the value returned by a function
   in its original home.  This becomes invalid if any more code is emitted.  */
extern rtx hard_function_value PROTO((tree, tree));

extern rtx prepare_call_address	PROTO((rtx, tree, rtx *, int));

extern rtx expand_call PROTO((tree, rtx, int));

extern rtx expand_shift PROTO((enum tree_code, enum machine_mode, rtx, tree, rtx, int));
extern rtx expand_divmod PROTO((int, enum tree_code, enum machine_mode, rtx, rtx, rtx, int));
extern void locate_and_pad_parm PROTO((enum machine_mode, tree, int, tree, struct args_size *, struct args_size *, struct args_size *));
extern rtx expand_inline_function PROTO((tree, tree, rtx, int, tree, rtx));
/* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary.  */
extern rtx label_rtx PROTO((tree));
#endif

/* Indicate how an input argument register was promoted.  */
extern rtx promoted_input_arg PROTO((int, enum machine_mode *, int *));

/* Return an rtx like arg but sans any constant terms.
   Returns the original rtx if it has no constant terms.
   The constant terms are added and stored via a second arg.  */
extern rtx eliminate_constant_term PROTO((rtx, rtx *));

/* Convert arg to a valid memory address for specified machine mode,
   by emitting insns to perform arithmetic if nec.  */
extern rtx memory_address PROTO((enum machine_mode, rtx));

/* Like `memory_address' but pretent `flag_force_addr' is 0.  */
extern rtx memory_address_noforce PROTO((enum machine_mode, rtx));

/* Return a memory reference like MEMREF, but with its mode changed
   to MODE and its address changed to ADDR.
   (VOIDmode means don't change the mode.
   NULL for ADDR means don't change the address.)  */
extern rtx change_address PROTO((rtx, enum machine_mode, rtx));

/* Return a memory reference like MEMREF, but which is known to have a
   valid address.  */

extern rtx validize_mem PROTO((rtx));

/* Assemble the static constant template for function entry trampolines.  */
extern rtx assemble_trampoline_template PROTO((void));

/* Return 1 if two rtx's are equivalent in structure and elements.  */
extern int rtx_equal_p PROTO((rtx, rtx));

/* Given rtx, return new rtx whose address won't be affected by
   any side effects.  It has been copied to a new temporary reg.  */
extern rtx stabilize PROTO((rtx));

/* Given an rtx, copy all regs it refers to into new temps
   and return a modified copy that refers to the new temps.  */
extern rtx copy_all_regs PROTO((rtx));

/* Copy given rtx to a new temp reg and return that.  */
extern rtx copy_to_reg PROTO((rtx));

/* Like copy_to_reg but always make the reg Pmode.  */
extern rtx copy_addr_to_reg PROTO((rtx));

/* Like copy_to_reg but always make the reg the specified mode MODE.  */
extern rtx copy_to_mode_reg PROTO((enum machine_mode, rtx));

/* Copy given rtx to given temp reg and return that.  */
extern rtx copy_to_suggested_reg PROTO((rtx, rtx, enum machine_mode));

/* Copy a value to a register if it isn't already a register.
   Args are mode (in case value is a constant) and the value.  */
extern rtx force_reg PROTO((enum machine_mode, rtx));

/* Return given rtx, copied into a new temp reg if it was in memory.  */
extern rtx force_not_mem PROTO((rtx));

#ifdef TREE_CODE
/* Return mode and signedness to use when object is promoted.  */
extern enum machine_mode promote_mode PROTO((tree, enum machine_mode,
					     int *, int));
#endif

/* Remove some bytes from the stack.  An rtx says how many.  */
extern void adjust_stack PROTO((rtx));

/* Add some bytes to the stack.  An rtx says how many.  */
extern void anti_adjust_stack PROTO((rtx));

/* This enum is used for the following two functions.  */
enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};

/* Save the stack pointer at the specified level.  */
extern void emit_stack_save PROTO((enum save_level, rtx *, rtx));

/* Restore the stack pointer from a save area of the specified level.  */
extern void emit_stack_restore PROTO((enum save_level, rtx, rtx));

/* Allocate some space on the stack dynamically and return its address.  An rtx
   says how many bytes.  */
extern rtx allocate_dynamic_stack_space PROTO((rtx, rtx, int));

/* Emit code to copy function value to a new temp reg and return that reg.  */
extern rtx function_value ();

/* Return an rtx that refers to the value returned by a library call
   in its original home.  This becomes invalid if any more code is emitted.  */
extern rtx hard_libcall_value PROTO((enum machine_mode));

/* Given an rtx, return an rtx for a value rounded up to a multiple
   of STACK_BOUNDARY / BITS_PER_UNIT.  */
extern rtx round_push PROTO((rtx));

extern void emit_block_move PROTO((rtx, rtx, rtx, int));

extern rtx store_bit_field PROTO((rtx, int, int, enum machine_mode, rtx, int, int));
extern rtx extract_bit_field PROTO((rtx, int, int, int, rtx, enum machine_mode, enum machine_mode, int, int));
extern rtx expand_mult PROTO((enum machine_mode, rtx, rtx, rtx, int));
extern rtx expand_mult_add PROTO((rtx, rtx, rtx, rtx,enum machine_mode, int));

extern rtx assemble_static_space PROTO((int));

/* Hook called by expand_expr for language-specific tree codes.
   It is up to the language front end to install a hook
   if it has any such codes that expand_expr needs to know about.  */
extern rtx (*lang_expand_expr) ();