rtl.h

早期freebsd实现

     REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use
   CC0, respectively.  Normally, these are required to be consecutive insns,
   but we permit putting a cc0-setting insn in the delay slot of a branch
   as long as only one copy of the insn exists.  In that case, these notes
   point from one to the other to allow code generation to determine what
   any require information and to properly update CC_STATUS.
     REG_LABEL points to a CODE_LABEL.  Used by non-JUMP_INSNs to
   say that the CODE_LABEL contained in the REG_LABEL note is used
   by the insn.
     REG_DEP_ANTI is used in LOG_LINKS which represent anti (write after read)
   dependencies.  REG_DEP_OUTPUT is used in LOG_LINKS which represent output
   (write after write) dependencies.  Data dependencies, which are the only
   type of LOG_LINK created by flow, are represented by a 0 reg note kind.  */

#define REG_NOTES(INSN)	((INSN)->fld[6].rtx)

/* Don't forget to change reg_note_name in rtl.c.  */
enum reg_note { REG_DEAD = 1, REG_INC = 2, REG_EQUIV = 3, REG_WAS_0 = 4,
		REG_EQUAL = 5, REG_RETVAL = 6, REG_LIBCALL = 7,
		REG_NONNEG = 8, REG_NO_CONFLICT = 9, REG_UNUSED = 10,
		REG_CC_SETTER = 11, REG_CC_USER = 12, REG_LABEL = 13,
		REG_DEP_ANTI = 14, REG_DEP_OUTPUT = 15 };

/* Define macros to extract and insert the reg-note kind in an EXPR_LIST.  */
#define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
#define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))

/* Names for REG_NOTE's in EXPR_LIST insn's.  */

extern char *reg_note_name[];
#define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int)(MODE)])

/* The label-number of a code-label.  The assembler label
   is made from `L' and the label-number printed in decimal.
   Label numbers are unique in a compilation.  */
#define CODE_LABEL_NUMBER(INSN)	((INSN)->fld[3].rtint)

#define LINE_NUMBER NOTE

/* In a NOTE that is a line number, this is a string for the file name
   that the line is in.  We use the same field to record block numbers
   temporarily in NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes.
   (We avoid lots of casts between ints and pointers if we use a
   different macro for the bock number.)  */

#define NOTE_SOURCE_FILE(INSN)  ((INSN)->fld[3].rtstr)
#define NOTE_BLOCK_NUMBER(INSN) ((INSN)->fld[3].rtint)

/* In a NOTE that is a line number, this is the line number.
   Other kinds of NOTEs are identified by negative numbers here.  */
#define NOTE_LINE_NUMBER(INSN) ((INSN)->fld[4].rtint)

/* Codes that appear in the NOTE_LINE_NUMBER field
   for kinds of notes that are not line numbers.  */

/* This note indicates the end of the real body of the function,
   after moving the parms into their homes, etc.  */
#define NOTE_INSN_FUNCTION_BEG 0

/* This note is used to get rid of an insn
   when it isn't safe to patch the insn out of the chain.  */
#define NOTE_INSN_DELETED -1
#define NOTE_INSN_BLOCK_BEG -2
#define NOTE_INSN_BLOCK_END -3
#define NOTE_INSN_LOOP_BEG -4
#define NOTE_INSN_LOOP_END -5
/* This kind of note is generated at the end of the function body,
   just before the return insn or return label.
   In an optimizing compilation it is deleted by the first jump optimization,
   after enabling that optimizer to determine whether control can fall
   off the end of the function body without a return statement.  */
#define NOTE_INSN_FUNCTION_END -6
/* This kind of note is generated just after each call to `setjmp', et al.  */
#define NOTE_INSN_SETJMP -7
/* Generated at the place in a loop that `continue' jumps to.  */
#define NOTE_INSN_LOOP_CONT -8
/* Generated at the start of a duplicated exit test.  */
#define NOTE_INSN_LOOP_VTOP -9
/* This marks the point immediately after the last prologue insn.  */
#define NOTE_INSN_PROLOGUE_END -10
/* This marks the point immediately prior to the first epilogue insn.  */
#define NOTE_INSN_EPILOGUE_BEG -11
/* Generated in place of user-declared labels when they are deleted.  */
#define NOTE_INSN_DELETED_LABEL -12
/* Don't forget to change note_insn_name in rtl.c.  */


#if 0 /* These are not used, and I don't know what they were for. --rms.  */
#define NOTE_DECL_NAME(INSN) ((INSN)->fld[3].rtstr)
#define NOTE_DECL_CODE(INSN) ((INSN)->fld[4].rtint)
#define NOTE_DECL_RTL(INSN) ((INSN)->fld[5].rtx)
#define NOTE_DECL_IDENTIFIER(INSN) ((INSN)->fld[6].rtint)
#define NOTE_DECL_TYPE(INSN) ((INSN)->fld[7].rtint)
#endif /* 0 */

/* Names for NOTE insn's other than line numbers.  */

extern char *note_insn_name[];
#define GET_NOTE_INSN_NAME(NOTE_CODE) (note_insn_name[-(NOTE_CODE)])

/* The name of a label, in case it corresponds to an explicit label
   in the input source code.  */
#define LABEL_NAME(LABEL) ((LABEL)->fld[4].rtstr)

/* In jump.c, each label contains a count of the number
   of LABEL_REFs that point at it, so unused labels can be deleted.  */
#define LABEL_NUSES(LABEL) ((LABEL)->fld[5].rtint)

/* In jump.c, each JUMP_INSN can point to a label that it can jump to,
   so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
   be decremented and possibly the label can be deleted.  */
#define JUMP_LABEL(INSN)   ((INSN)->fld[7].rtx)

/* Once basic blocks are found in flow.c,
   each CODE_LABEL starts a chain that goes through
   all the LABEL_REFs that jump to that label.
   The chain eventually winds up at the CODE_LABEL; it is circular.  */
#define LABEL_REFS(LABEL) ((LABEL)->fld[5].rtx)

/* This is the field in the LABEL_REF through which the circular chain
   of references to a particular label is linked.
   This chain is set up in flow.c.  */

#define LABEL_NEXTREF(REF) ((REF)->fld[1].rtx)

/* Once basic blocks are found in flow.c,
   Each LABEL_REF points to its containing instruction with this field.  */

#define CONTAINING_INSN(RTX) ((RTX)->fld[2].rtx)

/* For a REG rtx, REGNO extracts the register number.  */

#define REGNO(RTX) ((RTX)->fld[0].rtint)

/* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
   is the current function's return value.  */

#define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)

/* 1 in a REG rtx if it corresponds to a variable declared by the user.  */
#define REG_USERVAR_P(RTX) ((RTX)->volatil)

/* For a CONST_INT rtx, INTVAL extracts the integer.  */

#define INTVAL(RTX) ((RTX)->fld[0].rtwint)

/* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
   SUBREG_WORD extracts the word-number.  */

#define SUBREG_REG(RTX) ((RTX)->fld[0].rtx)
#define SUBREG_WORD(RTX) ((RTX)->fld[1].rtint)

/* 1 if the REG contained in SUBREG_REG is already known to be
   sign- or zero-extended from the mode of the SUBREG to the mode of
   the reg.  SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
   extension.  

   When used as a LHS, is means that this extension must be done
   when assigning to SUBREG_REG.  */

#define SUBREG_PROMOTED_VAR_P(RTX) ((RTX)->in_struct)
#define SUBREG_PROMOTED_UNSIGNED_P(RTX) ((RTX)->unchanging)

/* Access various components of an ASM_OPERANDS rtx.  */

#define ASM_OPERANDS_TEMPLATE(RTX) XSTR ((RTX), 0)
#define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XSTR ((RTX), 1)
#define ASM_OPERANDS_OUTPUT_IDX(RTX) XINT ((RTX), 2)
#define ASM_OPERANDS_INPUT_VEC(RTX) XVEC ((RTX), 3)
#define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XVEC ((RTX), 4)
#define ASM_OPERANDS_INPUT(RTX, N) XVECEXP ((RTX), 3, (N))
#define ASM_OPERANDS_INPUT_LENGTH(RTX) XVECLEN ((RTX), 3)
#define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) XSTR (XVECEXP ((RTX), 4, (N)), 0)
#define ASM_OPERANDS_INPUT_MODE(RTX, N) GET_MODE (XVECEXP ((RTX), 4, (N)))
#define ASM_OPERANDS_SOURCE_FILE(RTX) XSTR ((RTX), 5)
#define ASM_OPERANDS_SOURCE_LINE(RTX) XINT ((RTX), 6)

/* For a MEM rtx, 1 if it's a volatile reference.
   Also in an ASM_OPERANDS rtx.  */
#define MEM_VOLATILE_P(RTX) ((RTX)->volatil)

/* For a MEM rtx, 1 if it refers to a structure or union component.  */
#define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)

/* For a LABEL_REF, 1 means that this reference is to a label outside the
   loop containing the reference.  */
#define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)

/* For a LABEL_REF, 1 means it is for a nonlocal label.  */
/* Likewise in an EXPR_LIST for a REG_LABEL note.  */
#define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil)

/* For a CODE_LABEL, 1 means always consider this label to be needed.  */
#define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)

/* For a REG, 1 means the register is used only in an exit test of a loop.  */
#define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)

/* During sched, for an insn, 1 means that the insn must be scheduled together
   with the preceding insn.  */
#define SCHED_GROUP_P(INSN) ((INSN)->in_struct)

/* During sched, for the LOG_LINKS of an insn, these cache the adjusted
   cost of the dependence link.  The cost of executing an instruction
   may vary based on how the results are used.  LINK_COST_ZERO is 1 when
   the cost through the link varies and is unchanged (i.e., the link has
   zero additional cost).  LINK_COST_FREE is 1 when the cost through the
   link is zero (i.e., the link makes the cost free).  In other cases,
   the adjustment to the cost is recomputed each time it is needed.  */
#define LINK_COST_ZERO(X) ((X)->jump)
#define LINK_COST_FREE(X) ((X)->call)

/* For a SET rtx, SET_DEST is the place that is set
   and SET_SRC is the value it is set to.  */
#define SET_DEST(RTX) ((RTX)->fld[0].rtx)
#define SET_SRC(RTX) ((RTX)->fld[1].rtx)

/* For a TRAP_IF rtx, TRAP_CONDITION is an expression.  */
#define TRAP_CONDITION(RTX) ((RTX)->fld[0].rtx)

/* 1 in a SYMBOL_REF if it addresses this function's constants pool.  */
#define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)

/* Flag in a SYMBOL_REF for machine-specific purposes.  */
#define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)

/* 1 means a SYMBOL_REF has been the library function in emit_library_call.  */
#define SYMBOL_REF_USED(RTX) ((RTX)->used)

/* For an INLINE_HEADER rtx, FIRST_FUNCTION_INSN is the first insn
   of the function that is not involved in copying parameters to
   pseudo-registers.  FIRST_PARM_INSN is the very first insn of
   the function, including the parameter copying.
   We keep this around in case we must splice
   this function into the assembly code at the end of the file.
   FIRST_LABELNO is the first label number used by the function (inclusive).
   LAST_LABELNO is the last label used by the function (exclusive).
   MAX_REGNUM is the largest pseudo-register used by that function.
   FUNCTION_ARGS_SIZE is the size of the argument block in the stack.
   POPS_ARGS is the number of bytes of input arguments popped by the function
   STACK_SLOT_LIST is the list of stack slots.
   FUNCTION_FLAGS are where single-bit flags are saved.
   OUTGOING_ARGS_SIZE is the size of the largest outgoing stack parameter list.
   ORIGINAL_ARG_VECTOR is a vector of the original DECL_RTX values
    for the function arguments.
   ORIGINAL_DECL_INITIAL is a pointer to the original DECL_INITIAL for the
    function.

   We want this to lay down like an INSN.  The PREV_INSN field
   is always NULL.  The NEXT_INSN field always points to the
   first function insn of the function being squirreled away.  */

#define FIRST_FUNCTION_INSN(RTX) ((RTX)->fld[2].rtx)
#define FIRST_PARM_INSN(RTX) ((RTX)->fld[3].rtx)
#define FIRST_LABELNO(RTX) ((RTX)->fld[4].rtint)
#define LAST_LABELNO(RTX) ((RTX)->fld[5].rtint)
#define MAX_PARMREG(RTX) ((RTX)->fld[6].rtint)
#define MAX_REGNUM(RTX) ((RTX)->fld[7].rtint)
#define FUNCTION_ARGS_SIZE(RTX) ((RTX)->fld[8].rtint)
#define POPS_ARGS(RTX) ((RTX)->fld[9].rtint)
#define STACK_SLOT_LIST(RTX) ((RTX)->fld[10].rtx)
#define FUNCTION_FLAGS(RTX) ((RTX)->fld[11].rtint)
#define OUTGOING_ARGS_SIZE(RTX) ((RTX)->fld[12].rtint)
#define ORIGINAL_ARG_VECTOR(RTX) ((RTX)->fld[13].rtvec)
#define ORIGINAL_DECL_INITIAL(RTX) ((RTX)->fld[14].rtx)

/* In FUNCTION_FLAGS we save some variables computed when emitting the code
   for the function and which must be `or'ed into the current flag values when
   insns from that function are being inlined.  */

/* These ought to be an enum, but non-ANSI compilers don't like that.  */
#define FUNCTION_FLAGS_CALLS_ALLOCA 01
#define FUNCTION_FLAGS_CALLS_SETJMP 02
#define FUNCTION_FLAGS_RETURNS_STRUCT 04
#define FUNCTION_FLAGS_RETURNS_PCC_STRUCT 010
#define FUNCTION_FLAGS_NEEDS_CONTEXT 020
#define FUNCTION_FLAGS_HAS_NONLOCAL_LABEL 040
#define FUNCTION_FLAGS_RETURNS_POINTER 0100
#define FUNCTION_FLAGS_USES_CONST_POOL 0200
#define FUNCTION_FLAGS_CALLS_LONGJMP 0400
#define FUNCTION_FLAGS_USES_PIC_OFFSET_TABLE 01000

/* Define a macro to look for REG_INC notes,
   but save time on machines where they never exist.  */

/* Don't continue this line--convex cc version 4.1 would lose.  */
#if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
#define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
#else
#define FIND_REG_INC_NOTE(insn, reg) 0
#endif

/* Indicate whether the machine has any sort of auto increment addressing.
   If not, we can avoid checking for REG_INC notes.  */

/* Don't continue this line--convex cc version 4.1 would lose.  */
#if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
#define AUTO_INC_DEC
#endif

/* Generally useful functions.  */