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Annotation of GNUtools/cc/tree.h, revision 1.1

1.1     ! root        1: /* Front-end tree definitions for GNU compiler.
        !             2:    Copyright (C) 1989, 1993 Free Software Foundation, Inc.
        !             3: 
        !             4: This file is part of GNU CC.
        !             5: 
        !             6: GNU CC is free software; you can redistribute it and/or modify
        !             7: it under the terms of the GNU General Public License as published by
        !             8: the Free Software Foundation; either version 2, or (at your option)
        !             9: any later version.
        !            10: 
        !            11: GNU CC is distributed in the hope that it will be useful,
        !            12: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            14: GNU General Public License for more details.
        !            15: 
        !            16: You should have received a copy of the GNU General Public License
        !            17: along with GNU CC; see the file COPYING.  If not, write to
        !            18: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            19: 
        !            20: #include "machmode.h"
        !            21: 
        !            22: /* codes of tree nodes */
        !            23: 
        !            24: #define DEFTREECODE(SYM, STRING, TYPE, NARGS)   SYM,
        !            25: 
        !            26: enum tree_code {
        !            27: #include "tree.def"
        !            28: 
        !            29:   LAST_AND_UNUSED_TREE_CODE    /* A convenient way to get a value for
        !            30:                                   NUM_TREE_CODE.  */
        !            31: };
        !            32: 
        !            33: #undef DEFTREECODE
        !            34: 
        !            35: /* Number of tree codes.  */
        !            36: #define NUM_TREE_CODES ((int)LAST_AND_UNUSED_TREE_CODE)
        !            37: 
        !            38: /* Indexed by enum tree_code, contains a character which is
        !            39:    `<' for a comparison expression, `1', for a unary arithmetic
        !            40:    expression, `2' for a binary arithmetic expression, `e' for
        !            41:    other types of expressions, `r' for a reference, `c' for a
        !            42:    constant, `d' for a decl, `t' for a type, `s' for a statement,
        !            43:    and `x' for anything else (TREE_LIST, IDENTIFIER, etc).  */
        !            44: 
        !            45: extern char **tree_code_type;
        !            46: #define TREE_CODE_CLASS(CODE)  (*tree_code_type[(int) (CODE)])
        !            47: 
        !            48: /* Number of argument-words in each kind of tree-node.  */
        !            49: 
        !            50: extern int *tree_code_length;
        !            51: 
        !            52: /* Names of tree components.  */
        !            53: 
        !            54: extern char **tree_code_name;
        !            55: 
        !            56: /* Codes that identify the various built in functions
        !            57:    so that expand_call can identify them quickly.  */
        !            58: 
        !            59: enum built_in_function
        !            60: {
        !            61:   NOT_BUILT_IN,
        !            62:   BUILT_IN_ALLOCA,
        !            63:   BUILT_IN_ABS,
        !            64:   BUILT_IN_FABS,
        !            65:   BUILT_IN_LABS,
        !            66:   BUILT_IN_FFS,
        !            67:   BUILT_IN_DIV,
        !            68:   BUILT_IN_LDIV,
        !            69:   BUILT_IN_FFLOOR,
        !            70:   BUILT_IN_FCEIL,
        !            71:   BUILT_IN_FMOD,
        !            72:   BUILT_IN_FREM,
        !            73:   BUILT_IN_MEMCPY,
        !            74:   BUILT_IN_MEMCMP,
        !            75:   BUILT_IN_MEMSET,
        !            76:   BUILT_IN_STRCPY,
        !            77:   BUILT_IN_STRCMP,
        !            78:   BUILT_IN_STRLEN,
        !            79:   BUILT_IN_FSQRT,
        !            80:   BUILT_IN_SIN,
        !            81:   BUILT_IN_COS,
        !            82:   BUILT_IN_GETEXP,
        !            83:   BUILT_IN_GETMAN,
        !            84:   BUILT_IN_SAVEREGS,
        !            85:   BUILT_IN_CLASSIFY_TYPE,
        !            86:   BUILT_IN_NEXT_ARG,
        !            87:   BUILT_IN_ARGS_INFO,
        !            88:   BUILT_IN_CONSTANT_P,
        !            89:   BUILT_IN_FRAME_ADDRESS,
        !            90:   BUILT_IN_RETURN_ADDRESS,
        !            91:   BUILT_IN_CALLER_RETURN_ADDRESS,
        !            92:   BUILT_IN_APPLY_ARGS,
        !            93:   BUILT_IN_APPLY,
        !            94:   BUILT_IN_RETURN,
        !            95: 
        !            96:   /* C++ extensions */
        !            97:   BUILT_IN_NEW,
        !            98:   BUILT_IN_VEC_NEW,
        !            99:   BUILT_IN_DELETE,
        !           100:   BUILT_IN_VEC_DELETE,
        !           101: 
        !           102:   /* Upper bound on non-language-specific builtins. */
        !           103:   END_BUILTINS
        !           104: };
        !           105: 
        !           106: /* The definition of tree nodes fills the next several pages.  */
        !           107: 
        !           108: /* A tree node can represent a data type, a variable, an expression
        !           109:    or a statement.  Each node has a TREE_CODE which says what kind of
        !           110:    thing it represents.  Some common codes are:
        !           111:    INTEGER_TYPE -- represents a type of integers.
        !           112:    ARRAY_TYPE -- represents a type of pointer.
        !           113:    VAR_DECL -- represents a declared variable.
        !           114:    INTEGER_CST -- represents a constant integer value.
        !           115:    PLUS_EXPR -- represents a sum (an expression).
        !           116: 
        !           117:    As for the contents of a tree node: there are some fields
        !           118:    that all nodes share.  Each TREE_CODE has various special-purpose
        !           119:    fields as well.  The fields of a node are never accessed directly,
        !           120:    always through accessor macros.  */
        !           121: 
        !           122: /* This type is used everywhere to refer to a tree node.  */
        !           123: 
        !           124: typedef union tree_node *tree;
        !           125: 
        !           126: /* Every kind of tree node starts with this structure,
        !           127:    so all nodes have these fields.
        !           128: 
        !           129:    See the accessor macros, defined below, for documentation of the fields.  */
        !           130: 
        !           131: struct tree_common
        !           132: {
        !           133:   union tree_node *chain;
        !           134:   union tree_node *type;
        !           135: #ifdef ONLY_INT_FIELDS
        !           136:   unsigned int code : 8;
        !           137: #else
        !           138:   enum tree_code code : 8;
        !           139: #endif
        !           140: 
        !           141:   unsigned side_effects_flag : 1;
        !           142:   unsigned constant_flag : 1;
        !           143:   unsigned permanent_flag : 1;
        !           144:   unsigned addressable_flag : 1;
        !           145:   unsigned volatile_flag : 1;
        !           146:   unsigned readonly_flag : 1;
        !           147:   unsigned unsigned_flag : 1;
        !           148:   unsigned asm_written_flag: 1;
        !           149: 
        !           150:   unsigned used_flag : 1;
        !           151:   unsigned raises_flag : 1;
        !           152:   unsigned static_flag : 1;
        !           153:   unsigned public_flag : 1;
        !           154:   unsigned private_flag : 1;
        !           155:   unsigned protected_flag : 1;
        !           156: 
        !           157:   unsigned lang_flag_0 : 1;
        !           158:   unsigned lang_flag_1 : 1;
        !           159:   unsigned lang_flag_2 : 1;
        !           160:   unsigned lang_flag_3 : 1;
        !           161:   unsigned lang_flag_4 : 1;
        !           162:   unsigned lang_flag_5 : 1;
        !           163:   unsigned lang_flag_6 : 1;
        !           164:   /* There is room for two more flags.  */
        !           165: };
        !           166: 
        !           167: /* Define accessors for the fields that all tree nodes have
        !           168:    (though some fields are not used for all kinds of nodes).  */
        !           169: 
        !           170: /* The tree-code says what kind of node it is.
        !           171:    Codes are defined in tree.def.  */
        !           172: #define TREE_CODE(NODE) ((enum tree_code) (NODE)->common.code)
        !           173: #define TREE_SET_CODE(NODE, VALUE) ((NODE)->common.code = (int) (VALUE))
        !           174: 
        !           175: /* In all nodes that are expressions, this is the data type of the expression.
        !           176:    In POINTER_TYPE nodes, this is the type that the pointer points to.
        !           177:    In ARRAY_TYPE nodes, this is the type of the elements.  */
        !           178: #define TREE_TYPE(NODE) ((NODE)->common.type)
        !           179: 
        !           180: /* Nodes are chained together for many purposes.
        !           181:    Types are chained together to record them for being output to the debugger
        !           182:    (see the function `chain_type').
        !           183:    Decls in the same scope are chained together to record the contents
        !           184:    of the scope.
        !           185:    Statement nodes for successive statements used to be chained together.
        !           186:    Often lists of things are represented by TREE_LIST nodes that
        !           187:    are chained together.  */
        !           188: 
        !           189: #define TREE_CHAIN(NODE) ((NODE)->common.chain)
        !           190: 
        !           191: /* Given an expression as a tree, strip any NON_LVALUE_EXPRs and NOP_EXPRs
        !           192:    that don't change the machine mode.  */
        !           193: 
        !           194: #define STRIP_NOPS(EXP) \
        !           195:   while ((TREE_CODE (EXP) == NOP_EXPR                          \
        !           196:          || TREE_CODE (EXP) == CONVERT_EXPR                    \
        !           197:          || TREE_CODE (EXP) == NON_LVALUE_EXPR)                \
        !           198:         && (TYPE_MODE (TREE_TYPE (EXP))                        \
        !           199:             == TYPE_MODE (TREE_TYPE (TREE_OPERAND (EXP, 0))))) \
        !           200:     (EXP) = TREE_OPERAND (EXP, 0);
        !           201: 
        !           202: /* Like STRIP_NOPS, but don't alter the TREE_TYPE either.  */
        !           203: 
        !           204: #define STRIP_TYPE_NOPS(EXP) \
        !           205:   while ((TREE_CODE (EXP) == NOP_EXPR                          \
        !           206:          || TREE_CODE (EXP) == CONVERT_EXPR                    \
        !           207:          || TREE_CODE (EXP) == NON_LVALUE_EXPR)                \
        !           208:         && (TREE_TYPE (EXP)                                    \
        !           209:             == TREE_TYPE (TREE_OPERAND (EXP, 0))))             \
        !           210:     (EXP) = TREE_OPERAND (EXP, 0);
        !           211: 
        !           212: /* Nonzero if TYPE represents an integral type.  Note that we do not
        !           213:    include COMPLEX types here.  */
        !           214: 
        !           215: #define INTEGRAL_TYPE_P(TYPE)  \
        !           216:   (TREE_CODE (TYPE) == INTEGER_TYPE || TREE_CODE (TYPE) == ENUMERAL_TYPE  \
        !           217:    || TREE_CODE (TYPE) == BOOLEAN_TYPE || TREE_CODE (TYPE) == CHAR_TYPE)
        !           218: 
        !           219: /* Nonzero if TYPE represents a floating-point type, including complex
        !           220:    floating-point types.  */
        !           221: 
        !           222: #define FLOAT_TYPE_P(TYPE)             \
        !           223:   (TREE_CODE (TYPE) == REAL_TYPE       \
        !           224:    || (TREE_CODE (TYPE) == COMPLEX_TYPE \
        !           225:        && TREE_CODE (TREE_TYPE (TYPE)) == REAL_TYPE))
        !           226: 
        !           227: /* Define many boolean fields that all tree nodes have.  */
        !           228: 
        !           229: /* In VAR_DECL nodes, nonzero means address of this is needed.
        !           230:    So it cannot be in a register.
        !           231:    In a FUNCTION_DECL, nonzero means its address is needed.
        !           232:    So it must be compiled even if it is an inline function.
        !           233:    In CONSTRUCTOR nodes, it means object constructed must be in memory.
        !           234:    In LABEL_DECL nodes, it means a goto for this label has been seen 
        !           235:    from a place outside all binding contours that restore stack levels.
        !           236:    In ..._TYPE nodes, it means that objects of this type must
        !           237:    be fully addressable.  This means that pieces of this
        !           238:    object cannot go into register parameters, for example.
        !           239:    In IDENTIFIER_NODEs, this means that some extern decl for this name
        !           240:    had its address taken.  That matters for inline functions.  */
        !           241: #define TREE_ADDRESSABLE(NODE) ((NODE)->common.addressable_flag)
        !           242: 
        !           243: /* In a VAR_DECL, nonzero means allocate static storage.
        !           244:    In a FUNCTION_DECL, nonzero if function has been defined.
        !           245:    In a CONSTRUCTOR, nonzero means allocate static storage.  */
        !           246: #define TREE_STATIC(NODE) ((NODE)->common.static_flag)
        !           247: 
        !           248: /* In a CONVERT_EXPR or NOP_EXPR, this means the node was made
        !           249:    implicitly and should not lead to an "unused value" warning.  */
        !           250: #define TREE_NO_UNUSED_WARNING(NODE) ((NODE)->common.static_flag)
        !           251: 
        !           252: /* Nonzero for a TREE_LIST or TREE_VEC node means that the derivation
        !           253:    chain is via a `virtual' declaration.  */
        !           254: #define TREE_VIA_VIRTUAL(NODE) ((NODE)->common.static_flag)
        !           255: 
        !           256: /* In an INTEGER_CST, this means there was an overflow in folding.
        !           257:    This is distinct from TREE_OVERFLOW because ANSI C requires a diagnostic
        !           258:    when overflows occur in constant expressions.  */
        !           259: #define TREE_CONSTANT_OVERFLOW(NODE) ((NODE)->common.static_flag)
        !           260: 
        !           261: /* In an INTEGER_CST, this means there was an overflow in folding,
        !           262:    and no warning has been issued for this subexpression.
        !           263:    TREE_OVERFLOW implies TREE_CONSTANT_OVERFLOW, but not vice versa.  */
        !           264: #define TREE_OVERFLOW(NODE) ((NODE)->common.public_flag)
        !           265: 
        !           266: /* In a VAR_DECL or FUNCTION_DECL,
        !           267:    nonzero means name is to be accessible from outside this module.
        !           268:    In an identifier node, nonzero means an external declaration
        !           269:    accessible from outside this module was previously seen
        !           270:    for this name in an inner scope.  */
        !           271: #define TREE_PUBLIC(NODE) ((NODE)->common.public_flag)
        !           272: 
        !           273: /* Nonzero for TREE_LIST or TREE_VEC node means that the path to the
        !           274:    base class is via a `public' declaration, which preserves public
        !           275:    fields from the base class as public.  */
        !           276: #define TREE_VIA_PUBLIC(NODE) ((NODE)->common.public_flag)
        !           277: 
        !           278: /* Ditto, for `private' declarations.  */
        !           279: #define TREE_VIA_PRIVATE(NODE) ((NODE)->common.private_flag)
        !           280: 
        !           281: /* Nonzero for TREE_LIST node means that the path to the
        !           282:    base class is via a `protected' declaration, which preserves
        !           283:    protected fields from the base class as protected.
        !           284:    OVERLOADED.  */
        !           285: #define TREE_VIA_PROTECTED(NODE) ((NODE)->common.protected_flag)
        !           286: 
        !           287: /* In any expression, nonzero means it has side effects or reevaluation
        !           288:    of the whole expression could produce a different value.
        !           289:    This is set if any subexpression is a function call, a side effect
        !           290:    or a reference to a volatile variable.
        !           291:    In a ..._DECL, this is set only if the declaration said `volatile'.  */
        !           292: #define TREE_SIDE_EFFECTS(NODE) ((NODE)->common.side_effects_flag)
        !           293: 
        !           294: /* Nonzero means this expression is volatile in the C sense:
        !           295:    its address should be of type `volatile WHATEVER *'.
        !           296:    In other words, the declared item is volatile qualified.
        !           297:    This is used in _DECL nodes and _REF nodes.
        !           298: 
        !           299:    In a ..._TYPE node, means this type is volatile-qualified.
        !           300:    But use TYPE_VOLATILE instead of this macro when the node is a type,
        !           301:    because eventually we may make that a different bit.
        !           302: 
        !           303:    If this bit is set in an expression, so is TREE_SIDE_EFFECTS.  */
        !           304: #define TREE_THIS_VOLATILE(NODE) ((NODE)->common.volatile_flag)
        !           305: 
        !           306: /* In a VAR_DECL, PARM_DECL or FIELD_DECL, or any kind of ..._REF node,
        !           307:    nonzero means it may not be the lhs of an assignment.
        !           308:    In a ..._TYPE node, means this type is const-qualified
        !           309:    (but the macro TYPE_READONLY should be used instead of this macro
        !           310:    when the node is a type).  */
        !           311: #define TREE_READONLY(NODE) ((NODE)->common.readonly_flag)
        !           312: 
        !           313: /* Value of expression is constant.
        !           314:    Always appears in all ..._CST nodes.
        !           315:    May also appear in an arithmetic expression, an ADDR_EXPR or a CONSTRUCTOR
        !           316:    if the value is constant.  */
        !           317: #define TREE_CONSTANT(NODE) ((NODE)->common.constant_flag)
        !           318: 
        !           319: /* Nonzero means permanent node;
        !           320:    node will continue to exist for the entire compiler run.
        !           321:    Otherwise it will be recycled at the end of the function.  */
        !           322: #define TREE_PERMANENT(NODE) ((NODE)->common.permanent_flag)
        !           323: 
        !           324: /* In INTEGER_TYPE or ENUMERAL_TYPE nodes, means an unsigned type.
        !           325:    In FIELD_DECL nodes, means an unsigned bit field.
        !           326:    The same bit is used in functions as DECL_BUILT_IN_NONANSI.  */
        !           327: #define TREE_UNSIGNED(NODE) ((NODE)->common.unsigned_flag)
        !           328: 
        !           329: /* Nonzero in a VAR_DECL means assembler code has been written.
        !           330:    Nonzero in a FUNCTION_DECL means that the function has been compiled.
        !           331:    This is interesting in an inline function, since it might not need
        !           332:    to be compiled separately.
        !           333:    Nonzero in a RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE or ENUMERAL_TYPE
        !           334:    if the sdb debugging info for the type has been written.
        !           335:    In a BLOCK node, nonzero if reorder_blocks has already seen this block.  */
        !           336: #define TREE_ASM_WRITTEN(NODE) ((NODE)->common.asm_written_flag)
        !           337: 
        !           338: /* Nonzero in a _DECL if the name is used in its scope.
        !           339:    Nonzero in an expr node means inhibit warning if value is unused.
        !           340:    In IDENTIFIER_NODEs, this means that some extern decl for this name
        !           341:    was used.  */
        !           342: #define TREE_USED(NODE) ((NODE)->common.used_flag)
        !           343: 
        !           344: /* Nonzero for a tree node whose evaluation could result
        !           345:    in the raising of an exception.  Not implemented yet.  */
        !           346: #define TREE_RAISES(NODE) ((NODE)->common.raises_flag)
        !           347: 
        !           348: /* Used in classes in C++.  */
        !           349: #define TREE_PRIVATE(NODE) ((NODE)->common.private_flag)
        !           350: /* Used in classes in C++.
        !           351:    In a BLOCK node, this is BLOCK_HANDLER_BLOCK.  */
        !           352: #define TREE_PROTECTED(NODE) ((NODE)->common.protected_flag)
        !           353: 
        !           354: /* This specifies for a decl, if it is a offset type */
        !           355: #define TREE_SELF_OFFSET(NODE) TREE_LANG_FLAG_6 (NODE)
        !           356: 
        !           357: /* These flags are available for each language front end to use internally.  */
        !           358: #define TREE_LANG_FLAG_0(NODE) ((NODE)->common.lang_flag_0)
        !           359: #define TREE_LANG_FLAG_1(NODE) ((NODE)->common.lang_flag_1)
        !           360: #define TREE_LANG_FLAG_2(NODE) ((NODE)->common.lang_flag_2)
        !           361: #define TREE_LANG_FLAG_3(NODE) ((NODE)->common.lang_flag_3)
        !           362: #define TREE_LANG_FLAG_4(NODE) ((NODE)->common.lang_flag_4)
        !           363: #define TREE_LANG_FLAG_5(NODE) ((NODE)->common.lang_flag_5)
        !           364: #define TREE_LANG_FLAG_6(NODE) ((NODE)->common.lang_flag_6)
        !           365: 
        !           366: /* Define additional fields and accessors for nodes representing constants.  */
        !           367: 
        !           368: /* In an INTEGER_CST node.  These two together make a 2-word integer.
        !           369:    If the data type is signed, the value is sign-extended to 2 words
        !           370:    even though not all of them may really be in use.
        !           371:    In an unsigned constant shorter than 2 words, the extra bits are 0.  */
        !           372: #define TREE_INT_CST_LOW(NODE) ((NODE)->int_cst.int_cst_low)
        !           373: #define TREE_INT_CST_HIGH(NODE) ((NODE)->int_cst.int_cst_high)
        !           374: 
        !           375: #define INT_CST_LT(A, B)  \
        !           376: (TREE_INT_CST_HIGH (A) < TREE_INT_CST_HIGH (B)                 \
        !           377:  || (TREE_INT_CST_HIGH (A) == TREE_INT_CST_HIGH (B)            \
        !           378:      && ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (A)         \
        !           379:         < (unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (B))))
        !           380: 
        !           381: #define INT_CST_LT_UNSIGNED(A, B)  \
        !           382: (((unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (A)       \
        !           383:   < (unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (B))    \
        !           384:  || (((unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (A)   \
        !           385:       == (unsigned HOST_WIDE_INT ) TREE_INT_CST_HIGH (B)) \
        !           386:      && (((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (A)        \
        !           387:          < (unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (B)))))
        !           388: 
        !           389: struct tree_int_cst
        !           390: {
        !           391:   char common[sizeof (struct tree_common)];
        !           392:   HOST_WIDE_INT int_cst_low;
        !           393:   HOST_WIDE_INT int_cst_high;
        !           394: };
        !           395: 
        !           396: /* In REAL_CST, STRING_CST, COMPLEX_CST nodes, and CONSTRUCTOR nodes,
        !           397:    and generally in all kinds of constants that could
        !           398:    be given labels (rather than being immediate).  */
        !           399: 
        !           400: #define TREE_CST_RTL(NODE) ((NODE)->real_cst.rtl)
        !           401: 
        !           402: /* In a REAL_CST node.  */
        !           403: /* We can represent a real value as either a `double' or a string.
        !           404:    Strings don't allow for any optimization, but they do allow
        !           405:    for cross-compilation.  */
        !           406: 
        !           407: #define TREE_REAL_CST(NODE) ((NODE)->real_cst.real_cst)
        !           408: 
        !           409: #include "real.h"
        !           410: 
        !           411: struct tree_real_cst
        !           412: {
        !           413:   char common[sizeof (struct tree_common)];
        !           414:   struct rtx_def *rtl; /* acts as link to register transfer language
        !           415:                                   (rtl) info */
        !           416:   REAL_VALUE_TYPE real_cst;
        !           417: };
        !           418: 
        !           419: /* In a STRING_CST */
        !           420: #define TREE_STRING_LENGTH(NODE) ((NODE)->string.length)
        !           421: #define TREE_STRING_POINTER(NODE) ((NODE)->string.pointer)
        !           422: 
        !           423: struct tree_string
        !           424: {
        !           425:   char common[sizeof (struct tree_common)];
        !           426:   struct rtx_def *rtl; /* acts as link to register transfer language
        !           427:                                   (rtl) info */
        !           428:   int length;
        !           429:   char *pointer;
        !           430: };
        !           431: 
        !           432: /* In a COMPLEX_CST node.  */
        !           433: #define TREE_REALPART(NODE) ((NODE)->complex.real)
        !           434: #define TREE_IMAGPART(NODE) ((NODE)->complex.imag)
        !           435: 
        !           436: struct tree_complex
        !           437: {
        !           438:   char common[sizeof (struct tree_common)];
        !           439:   struct rtx_def *rtl; /* acts as link to register transfer language
        !           440:                                   (rtl) info */
        !           441:   union tree_node *real;
        !           442:   union tree_node *imag;
        !           443: };
        !           444: 
        !           445: /* Define fields and accessors for some special-purpose tree nodes.  */
        !           446: 
        !           447: #define IDENTIFIER_LENGTH(NODE) ((NODE)->identifier.length)
        !           448: #define IDENTIFIER_POINTER(NODE) ((NODE)->identifier.pointer)
        !           449: 
        !           450: struct tree_identifier
        !           451: {
        !           452:   char common[sizeof (struct tree_common)];
        !           453:   int length;
        !           454:   char *pointer;
        !           455: };
        !           456: 
        !           457: /* In a TREE_LIST node.  */
        !           458: #define TREE_PURPOSE(NODE) ((NODE)->list.purpose)
        !           459: #define TREE_VALUE(NODE) ((NODE)->list.value)
        !           460: 
        !           461: struct tree_list
        !           462: {
        !           463:   char common[sizeof (struct tree_common)];
        !           464:   union tree_node *purpose;
        !           465:   union tree_node *value;
        !           466: };
        !           467: 
        !           468: /* In a TREE_VEC node.  */
        !           469: #define TREE_VEC_LENGTH(NODE) ((NODE)->vec.length)
        !           470: #define TREE_VEC_ELT(NODE,I) ((NODE)->vec.a[I])
        !           471: #define TREE_VEC_END(NODE) (&((NODE)->vec.a[(NODE)->vec.length]))
        !           472: 
        !           473: struct tree_vec
        !           474: {
        !           475:   char common[sizeof (struct tree_common)];
        !           476:   int length;
        !           477:   union tree_node *a[1];
        !           478: };
        !           479: 
        !           480: /* Define fields and accessors for some nodes that represent expressions.  */
        !           481: 
        !           482: /* In a SAVE_EXPR node.  */
        !           483: #define SAVE_EXPR_CONTEXT(NODE) TREE_OPERAND(NODE, 1)
        !           484: #define SAVE_EXPR_RTL(NODE) (*(struct rtx_def **) &(NODE)->exp.operands[2])
        !           485: 
        !           486: /* In a RTL_EXPR node.  */
        !           487: #define RTL_EXPR_SEQUENCE(NODE) (*(struct rtx_def **) &(NODE)->exp.operands[0])
        !           488: #define RTL_EXPR_RTL(NODE) (*(struct rtx_def **) &(NODE)->exp.operands[1])
        !           489: 
        !           490: /* In a CALL_EXPR node.  */
        !           491: #define CALL_EXPR_RTL(NODE) (*(struct rtx_def **) &(NODE)->exp.operands[2])
        !           492: 
        !           493: /* In a CONSTRUCTOR node.  */
        !           494: #define CONSTRUCTOR_ELTS(NODE) TREE_OPERAND (NODE, 1)
        !           495: 
        !           496: /* In ordinary expression nodes.  */
        !           497: #define TREE_OPERAND(NODE, I) ((NODE)->exp.operands[I])
        !           498: #define TREE_COMPLEXITY(NODE) ((NODE)->exp.complexity)
        !           499: 
        !           500: struct tree_exp
        !           501: {
        !           502:   char common[sizeof (struct tree_common)];
        !           503:   int complexity;
        !           504:   union tree_node *operands[1];
        !           505: };
        !           506: 
        !           507: /* In a BLOCK node.  */
        !           508: #define BLOCK_VARS(NODE) ((NODE)->block.vars)
        !           509: #define BLOCK_TYPE_TAGS(NODE) ((NODE)->block.type_tags)
        !           510: #define BLOCK_SUBBLOCKS(NODE) ((NODE)->block.subblocks)
        !           511: #define BLOCK_SUPERCONTEXT(NODE) ((NODE)->block.supercontext)
        !           512: /* Note: when changing this, make sure to find the places
        !           513:    that use chainon or nreverse.  */
        !           514: #define BLOCK_CHAIN(NODE) TREE_CHAIN (NODE)
        !           515: #define BLOCK_ABSTRACT_ORIGIN(NODE) ((NODE)->block.abstract_origin)
        !           516: #define BLOCK_ABSTRACT(NODE) ((NODE)->block.abstract_flag)
        !           517: #define BLOCK_END_NOTE(NODE) ((NODE)->block.end_note)
        !           518: 
        !           519: /* Nonzero means that this block is prepared to handle exceptions
        !           520:    listed in the BLOCK_VARS slot.  */
        !           521: #define BLOCK_HANDLER_BLOCK(NODE) ((NODE)->block.handler_block_flag)
        !           522: 
        !           523: struct tree_block
        !           524: {
        !           525:   char common[sizeof (struct tree_common)];
        !           526: 
        !           527:   unsigned handler_block_flag : 1;
        !           528:   unsigned abstract_flag : 1;
        !           529: 
        !           530:   union tree_node *vars;
        !           531:   union tree_node *type_tags;
        !           532:   union tree_node *subblocks;
        !           533:   union tree_node *supercontext;
        !           534:   union tree_node *abstract_origin;
        !           535:   struct rtx_def *end_note;
        !           536: };
        !           537: 
        !           538: /* Define fields and accessors for nodes representing data types.  */
        !           539: 
        !           540: /* See tree.def for documentation of the use of these fields.
        !           541:    Look at the documentation of the various ..._TYPE tree codes.  */
        !           542: 
        !           543: #define TYPE_UID(NODE) ((NODE)->type.uid)
        !           544: #define TYPE_SIZE(NODE) ((NODE)->type.size)
        !           545: #define TYPE_MODE(NODE) ((NODE)->type.mode)
        !           546: #define TYPE_VALUES(NODE) ((NODE)->type.values)
        !           547: #define TYPE_DOMAIN(NODE) ((NODE)->type.values)
        !           548: #define TYPE_FIELDS(NODE) ((NODE)->type.values)
        !           549: #define TYPE_METHODS(NODE) ((NODE)->type.maxval)
        !           550: #define TYPE_VFIELD(NODE) ((NODE)->type.minval)
        !           551: #define TYPE_ARG_TYPES(NODE) ((NODE)->type.values)
        !           552: #define TYPE_METHOD_BASETYPE(NODE) ((NODE)->type.maxval)
        !           553: #define TYPE_OFFSET_BASETYPE(NODE) ((NODE)->type.maxval)
        !           554: #define TYPE_POINTER_TO(NODE) ((NODE)->type.pointer_to)
        !           555: #define TYPE_REFERENCE_TO(NODE) ((NODE)->type.reference_to)
        !           556: #define TYPE_MIN_VALUE(NODE) ((NODE)->type.minval)
        !           557: #define TYPE_MAX_VALUE(NODE) ((NODE)->type.maxval)
        !           558: #define TYPE_PRECISION(NODE) ((NODE)->type.precision)
        !           559: #define TYPE_PARSE_INFO(NODE) ((NODE)->type.parse_info)
        !           560: #define TYPE_SYMTAB_ADDRESS(NODE) ((NODE)->type.symtab.address)
        !           561: #define TYPE_SYMTAB_POINTER(NODE) ((NODE)->type.symtab.pointer)
        !           562: #define TYPE_NAME(NODE) ((NODE)->type.name)
        !           563: #define TYPE_NEXT_VARIANT(NODE) ((NODE)->type.next_variant)
        !           564: #define TYPE_MAIN_VARIANT(NODE) ((NODE)->type.main_variant)
        !           565: #define TYPE_BINFO(NODE) ((NODE)->type.binfo)
        !           566: #define TYPE_NONCOPIED_PARTS(NODE) ((NODE)->type.noncopied_parts)
        !           567: #define TYPE_CONTEXT(NODE) ((NODE)->type.context)
        !           568: #define TYPE_OBSTACK(NODE) ((NODE)->type.obstack)
        !           569: #define TYPE_LANG_SPECIFIC(NODE) ((NODE)->type.lang_specific)
        !           570: 
        !           571: /* The alignment necessary for objects of this type.
        !           572:    The value is an int, measured in bits.  */
        !           573: #define TYPE_ALIGN(NODE) ((NODE)->type.align)
        !           574: 
        !           575: #define TYPE_STUB_DECL(NODE) (TREE_CHAIN (NODE))
        !           576: 
        !           577: /* In a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, it means the type
        !           578:    has BLKmode only because it lacks the alignment requirement for
        !           579:    its size.  */
        !           580: #define TYPE_NO_FORCE_BLK(NODE) ((NODE)->type.no_force_blk_flag)
        !           581: 
        !           582: /* Nonzero in a type considered volatile as a whole.  */
        !           583: #define TYPE_VOLATILE(NODE) ((NODE)->common.volatile_flag)
        !           584: 
        !           585: /* Means this type is const-qualified.  */
        !           586: #define TYPE_READONLY(NODE) ((NODE)->common.readonly_flag)
        !           587: 
        !           588: /* These flags are available for each language front end to use internally.  */
        !           589: #define TYPE_LANG_FLAG_0(NODE) ((NODE)->type.lang_flag_0)
        !           590: #define TYPE_LANG_FLAG_1(NODE) ((NODE)->type.lang_flag_1)
        !           591: #define TYPE_LANG_FLAG_2(NODE) ((NODE)->type.lang_flag_2)
        !           592: #define TYPE_LANG_FLAG_3(NODE) ((NODE)->type.lang_flag_3)
        !           593: #define TYPE_LANG_FLAG_4(NODE) ((NODE)->type.lang_flag_4)
        !           594: #define TYPE_LANG_FLAG_5(NODE) ((NODE)->type.lang_flag_5)
        !           595: #define TYPE_LANG_FLAG_6(NODE) ((NODE)->type.lang_flag_6)
        !           596: 
        !           597: struct tree_type
        !           598: {
        !           599:   char common[sizeof (struct tree_common)];
        !           600:   union tree_node *values;
        !           601:   union tree_node *size;
        !           602:   unsigned uid;
        !           603: 
        !           604: #ifdef ONLY_INT_FIELDS
        !           605:   int mode : 8;
        !           606: #else
        !           607:   enum machine_mode mode : 8;
        !           608: #endif
        !           609:   unsigned char precision;
        !           610: 
        !           611:   unsigned no_force_blk_flag : 1;
        !           612:   unsigned lang_flag_0 : 1;
        !           613:   unsigned lang_flag_1 : 1;
        !           614:   unsigned lang_flag_2 : 1;
        !           615:   unsigned lang_flag_3 : 1;
        !           616:   unsigned lang_flag_4 : 1;
        !           617:   unsigned lang_flag_5 : 1;
        !           618:   unsigned lang_flag_6 : 1;
        !           619: 
        !           620:   unsigned int align;
        !           621:   union tree_node *pointer_to;
        !           622:   union tree_node *reference_to;
        !           623:   int parse_info;
        !           624:   union {int address; char *pointer; } symtab;
        !           625:   union tree_node *name;
        !           626:   union tree_node *minval;
        !           627:   union tree_node *maxval;
        !           628:   union tree_node *next_variant;
        !           629:   union tree_node *main_variant;
        !           630:   union tree_node *binfo;
        !           631:   union tree_node *noncopied_parts;
        !           632:   union tree_node *context;
        !           633:   struct obstack *obstack;
        !           634:   /* Points to a structure whose details depend on the language in use.  */
        !           635:   struct lang_type *lang_specific;
        !           636: };
        !           637: 
        !           638: /* Define accessor macros for information about type inheritance
        !           639:    and basetypes.
        !           640: 
        !           641:    A "basetype" means a particular usage of a data type for inheritance
        !           642:    in another type.  Each such basetype usage has its own "binfo"
        !           643:    object to describe it.  The binfo object is a TREE_VEC node.
        !           644: 
        !           645:    Inheritance is represented by the binfo nodes allocated for a
        !           646:    given type.  For example, given types C and D, such that D is
        !           647:    inherited by C, 3 binfo nodes will be allocated: one for describing
        !           648:    the binfo properties of C, similarly one for D, and one for
        !           649:    describing the binfo properties of D as a base type for C.
        !           650:    Thus, given a pointer to class C, one can get a pointer to the binfo
        !           651:    of D acting as a basetype for C by looking at C's binfo's basetypes.  */
        !           652: 
        !           653: /* The actual data type node being inherited in this basetype.  */
        !           654: #define BINFO_TYPE(NODE) TREE_TYPE (NODE)
        !           655: 
        !           656: /* The offset where this basetype appears in its containing type.
        !           657:    BINFO_OFFSET slot holds the offset (in bytes)
        !           658:    from the base of the complete object to the base of the part of the
        !           659:    object that is allocated on behalf of this `type'.
        !           660:    This is always 0 except when there is multiple inheritance.  */
        !           661:    
        !           662: #define BINFO_OFFSET(NODE) TREE_VEC_ELT ((NODE), 1)
        !           663: #define TYPE_BINFO_OFFSET(NODE) BINFO_OFFSET (TYPE_BINFO (NODE))
        !           664: #define BINFO_OFFSET_ZEROP(NODE) (BINFO_OFFSET (NODE) == integer_zero_node)
        !           665: 
        !           666: /* The virtual function table belonging to this basetype.  Virtual
        !           667:    function tables provide a mechanism for run-time method dispatching.
        !           668:    The entries of a virtual function table are language-dependent.  */
        !           669: 
        !           670: #define BINFO_VTABLE(NODE) TREE_VEC_ELT ((NODE), 2)
        !           671: #define TYPE_BINFO_VTABLE(NODE) BINFO_VTABLE (TYPE_BINFO (NODE))
        !           672: 
        !           673: /* The virtual functions in the virtual function table.  This is
        !           674:    a TREE_LIST that is used as an initial approximation for building
        !           675:    a virtual function table for this basetype.  */
        !           676: #define BINFO_VIRTUALS(NODE) TREE_VEC_ELT ((NODE), 3)
        !           677: #define TYPE_BINFO_VIRTUALS(NODE) BINFO_VIRTUALS (TYPE_BINFO (NODE))
        !           678: 
        !           679: /* A vector of additional binfos for the types inherited by this basetype.
        !           680: 
        !           681:    If this basetype describes type D as inherited in C,
        !           682:    and if the basetypes of D are E anf F,
        !           683:    then this vector contains binfos for inheritance of E and F by C.
        !           684: 
        !           685:    ??? This could probably be done by just allocating the
        !           686:    base types at the end of this TREE_VEC (instead of using
        !           687:    another TREE_VEC).  This would simplify the calculation
        !           688:    of how many basetypes a given type had.  */
        !           689: #define BINFO_BASETYPES(NODE) TREE_VEC_ELT ((NODE), 4)
        !           690: #define TYPE_BINFO_BASETYPES(NODE) TREE_VEC_ELT (TYPE_BINFO (NODE), 4)
        !           691: 
        !           692: /* For a BINFO record describing an inheritance, this yields a pointer
        !           693:    to the artificial FIELD_DECL node which contains the "virtual base
        !           694:    class pointer" for the given inheritance.  */
        !           695: 
        !           696: #define BINFO_VPTR_FIELD(NODE) TREE_VEC_ELT ((NODE), 5)
        !           697: 
        !           698: /* Accessor macro to get to the Nth basetype of this basetype.  */
        !           699: #define BINFO_BASETYPE(NODE,N) TREE_VEC_ELT (BINFO_BASETYPES (NODE), (N))
        !           700: #define TYPE_BINFO_BASETYPE(NODE,N) BINFO_TYPE (TREE_VEC_ELT (BINFO_BASETYPES (TYPE_BINFO (NODE)), (N)))
        !           701: 
        !           702: /* Slot used to build a chain that represents a use of inheritance.
        !           703:    For example, if X is derived from Y, and Y is derived from Z,
        !           704:    then this field can be used to link the binfo node for X to
        !           705:    the binfo node for X's Y to represent the use of inheritance
        !           706:    from X to Y.  Similarly, this slot of the binfo node for X's Y
        !           707:    can point to the Z from which Y is inherited (in X's inheritance
        !           708:    hierarchy).  In this fashion, one can represent and traverse specific
        !           709:    uses of inheritance using the binfo nodes themselves (instead of
        !           710:    consing new space pointing to binfo nodes).
        !           711:    It is up to the language-dependent front-ends to maintain
        !           712:    this information as necessary.  */
        !           713: #define BINFO_INHERITANCE_CHAIN(NODE) TREE_VEC_ELT ((NODE), 0)
        !           714: 
        !           715: /* Define fields and accessors for nodes representing declared names.  */
        !           716: 
        !           717: /* This is the name of the object as written by the user.
        !           718:    It is an IDENTIFIER_NODE.  */
        !           719: #define DECL_NAME(NODE) ((NODE)->decl.name)
        !           720: /* This macro is marked for death.  */
        !           721: #define DECL_PRINT_NAME(NODE) ((NODE)->decl.print_name)
        !           722: /* This is the name of the object as the assembler will see it
        !           723:    (but before any translations made by ASM_OUTPUT_LABELREF).
        !           724:    Often this is the same as DECL_NAME.
        !           725:    It is an IDENTIFIER_NODE.  */
        !           726: #define DECL_ASSEMBLER_NAME(NODE) ((NODE)->decl.assembler_name)
        !           727: /*  For FIELD_DECLs, this is the
        !           728:     RECORD_TYPE, UNION_TYPE, or QUAL_UNION_TYPE node that the field is
        !           729:     a member of.  For VAR_DECL, PARM_DECL, FUNCTION_DECL, LABEL_DECL,
        !           730:     and CONST_DECL nodes, this points to the FUNCTION_DECL for the
        !           731:     containing function, or else yields NULL_TREE if the given decl has "file scope".  */
        !           732: #define DECL_CONTEXT(NODE) ((NODE)->decl.context)
        !           733: #define DECL_FIELD_CONTEXT(NODE) ((NODE)->decl.context)
        !           734: /* In a FIELD_DECL, this is the field position, counting in bits,
        !           735:    of the bit closest to the beginning of the structure.  */
        !           736: #define DECL_FIELD_BITPOS(NODE) ((NODE)->decl.arguments)
        !           737: /* In a FIELD_DECL, this indicates whether the field was a bit-field and
        !           738:    if so, the type that was originally specified for it.
        !           739:    TREE_TYPE may have been modified (in finish_struct).  */
        !           740: #define DECL_BIT_FIELD_TYPE(NODE) ((NODE)->decl.result)
        !           741: /* In FUNCTION_DECL, a chain of ..._DECL nodes.  */
        !           742: /* VAR_DECL and PARM_DECL reserve the arguments slot
        !           743:    for language-specific uses.  */
        !           744: #define DECL_ARGUMENTS(NODE) ((NODE)->decl.arguments)
        !           745: /* In FUNCTION_DECL, holds the decl for the return value.  */
        !           746: #define DECL_RESULT(NODE) ((NODE)->decl.result)
        !           747: /* In PARM_DECL, holds the type as written (perhaps a function or array).  */
        !           748: #define DECL_ARG_TYPE_AS_WRITTEN(NODE) ((NODE)->decl.result)
        !           749: /* For a FUNCTION_DECL, holds the tree of BINDINGs.
        !           750:    For a VAR_DECL, holds the initial value.
        !           751:    For a PARM_DECL, not used--default
        !           752:    values for parameters are encoded in the type of the function,
        !           753:    not in the PARM_DECL slot.  */
        !           754: #define DECL_INITIAL(NODE) ((NODE)->decl.initial)
        !           755: /* For a PARM_DECL, records the data type used to pass the argument,
        !           756:    which may be different from the type seen in the program.  */
        !           757: #define DECL_ARG_TYPE(NODE) ((NODE)->decl.initial)   /* In PARM_DECL.  */
        !           758: /* For a FIELD_DECL in a QUAL_UNION_TYPE, records the expression, which
        !           759:    if nonzero, indicates that the field occupies the type.  */
        !           760: #define DECL_QUALIFIER(NODE) ((NODE)->decl.initial)
        !           761: /* These two fields describe where in the source code the declaration was.  */
        !           762: #define DECL_SOURCE_FILE(NODE) ((NODE)->decl.filename)
        !           763: #define DECL_SOURCE_LINE(NODE) ((NODE)->decl.linenum)
        !           764: /* Holds the size of the datum, as a tree expression.
        !           765:    Need not be constant.  */
        !           766: #define DECL_SIZE(NODE) ((NODE)->decl.size)
        !           767: /* Holds the alignment required for the datum.  */
        !           768: #define DECL_ALIGN(NODE) ((NODE)->decl.frame_size)
        !           769: /* Holds the machine mode corresponding to the declaration of a variable or
        !           770:    field.  Always equal to TYPE_MODE (TREE_TYPE (decl)) except for a
        !           771:    FIELD_DECL.  */
        !           772: #define DECL_MODE(NODE) ((NODE)->decl.mode)
        !           773: /* Holds the RTL expression for the value of a variable or function.  If
        !           774:    PROMOTED_MODE is defined, the mode of this expression may not be same
        !           775:    as DECL_MODE.  In that case, DECL_MODE contains the mode corresponding
        !           776:    to the variable's data type, while the mode
        !           777:    of DECL_RTL is the mode actually used to contain the data.  */
        !           778: #define DECL_RTL(NODE) ((NODE)->decl.rtl)
        !           779: /* For PARM_DECL, holds an RTL for the stack slot or register
        !           780:    where the data was actually passed.  */
        !           781: #define DECL_INCOMING_RTL(NODE) ((NODE)->decl.saved_insns.r)
        !           782: /* For FUNCTION_DECL, if it is inline, holds the saved insn chain.  */
        !           783: #define DECL_SAVED_INSNS(NODE) ((NODE)->decl.saved_insns.r)
        !           784: /* For FUNCTION_DECL, if it is inline,
        !           785:    holds the size of the stack frame, as an integer.  */
        !           786: #define DECL_FRAME_SIZE(NODE) ((NODE)->decl.frame_size)
        !           787: /* For FUNCTION_DECL, if it is built-in,
        !           788:    this identifies which built-in operation it is.  */
        !           789: #define DECL_FUNCTION_CODE(NODE) \
        !           790:  ((enum built_in_function) (NODE)->decl.frame_size)
        !           791: #define DECL_SET_FUNCTION_CODE(NODE,VAL) \
        !           792:  ((NODE)->decl.frame_size = (int) (VAL))
        !           793: /* For a FIELD_DECL, holds the size of the member as an integer.  */
        !           794: #define DECL_FIELD_SIZE(NODE) ((NODE)->decl.saved_insns.i)
        !           795: 
        !           796: /* The DECL_VINDEX is used for FUNCTION_DECLS in two different ways.
        !           797:    Before the struct containing the FUNCTION_DECL is laid out,
        !           798:    DECL_VINDEX may point to a FUNCTION_DECL in a base class which
        !           799:    is the FUNCTION_DECL which this FUNCTION_DECL will replace as a virtual
        !           800:    function.  When the class is laid out, this pointer is changed
        !           801:    to an INTEGER_CST node which is suitable for use as an index
        !           802:    into the virtual function table.  */
        !           803: #define DECL_VINDEX(NODE) ((NODE)->decl.vindex)
        !           804: /* For FIELD_DECLS, DECL_FCONTEXT is the *first* baseclass in
        !           805:    which this FIELD_DECL is defined.  This information is needed when
        !           806:    writing debugging information about vfield and vbase decls for C++.  */
        !           807: #define DECL_FCONTEXT(NODE) ((NODE)->decl.vindex)
        !           808: 
        !           809: /* Every ..._DECL node gets a unique number.  */
        !           810: #define DECL_UID(NODE) ((NODE)->decl.uid)
        !           811: 
        !           812: /* For any sort of a ..._DECL node, this points to the original (abstract)
        !           813:    decl node which this decl is an instance of, or else it is NULL indicating
        !           814:    that this decl is not an instance of some other decl.  */
        !           815: #define DECL_ABSTRACT_ORIGIN(NODE) ((NODE)->decl.abstract_origin)
        !           816: 
        !           817: /* Nonzero for any sort of ..._DECL node means this decl node represents
        !           818:    an inline instance of some original (abstract) decl from an inline function;
        !           819:    suppress any warnings about shadowing some other variable.  */
        !           820: #define DECL_FROM_INLINE(NODE) (DECL_ABSTRACT_ORIGIN (NODE) != (tree) 0)
        !           821: 
        !           822: /* Nonzero if a _DECL means that the name of this decl should be ignored
        !           823:    for symbolic debug purposes.  */
        !           824: #define DECL_IGNORED_P(NODE) ((NODE)->decl.ignored_flag)
        !           825: 
        !           826: /* Nonzero for a given ..._DECL node means that this node represents an
        !           827:    "abstract instance" of the given declaration (e.g. in the original
        !           828:    declaration of an inline function).  When generating symbolic debugging
        !           829:    information, we musn't try to generate any address information for nodes
        !           830:    marked as "abstract instances" because we don't actually generate
        !           831:    any code or allocate any data space for such instances.  */
        !           832: #define DECL_ABSTRACT(NODE) ((NODE)->decl.abstract_flag)
        !           833: 
        !           834: /* Nonzero if a _DECL means that no warnings should be generated just
        !           835:    because this decl is unused.  */
        !           836: #define DECL_IN_SYSTEM_HEADER(NODE) ((NODE)->decl.in_system_header_flag)
        !           837: 
        !           838: /* Language-specific decl information.  */
        !           839: #define DECL_LANG_SPECIFIC(NODE) ((NODE)->decl.lang_specific)
        !           840: 
        !           841: /* In a VAR_DECL or FUNCTION_DECL,
        !           842:    nonzero means external reference:
        !           843:    do not allocate storage, and refer to a definition elsewhere.  */
        !           844: #define DECL_EXTERNAL(NODE) ((NODE)->decl.external_flag)
        !           845: 
        !           846: /* In VAR_DECL and PARM_DECL nodes, nonzero means declared `register'.
        !           847:    In LABEL_DECL nodes, nonzero means that an error message about
        !           848:    jumping into such a binding contour has been printed for this label.  */
        !           849: #define DECL_REGISTER(NODE) ((NODE)->decl.regdecl_flag)
        !           850: /* In a FIELD_DECL, indicates this field should be bit-packed.  */
        !           851: #define DECL_PACKED(NODE) ((NODE)->decl.regdecl_flag)
        !           852: 
        !           853: /* Nonzero in a ..._DECL means this variable is ref'd from a nested function.
        !           854:    For VAR_DECL nodes, PARM_DECL nodes, and FUNCTION_DECL nodes.
        !           855: 
        !           856:    For LABEL_DECL nodes, nonzero if nonlocal gotos to the label are permitted.
        !           857: 
        !           858:    Also set in some languages for variables, etc., outside the normal
        !           859:    lexical scope, such as class instance variables.  */
        !           860: #define DECL_NONLOCAL(NODE) ((NODE)->decl.nonlocal_flag)
        !           861: 
        !           862: /* Nonzero in a FUNCTION_DECL means this function can be substituted
        !           863:    where it is called.  */
        !           864: #define DECL_INLINE(NODE) ((NODE)->decl.inline_flag)
        !           865: 
        !           866: /* Nonzero in a FUNCTION_DECL means this is a built-in function
        !           867:    that is not specified by ansi C and that users are supposed to be allowed
        !           868:    to redefine for any purpose whatever.  */
        !           869: #define DECL_BUILT_IN_NONANSI(NODE) ((NODE)->common.unsigned_flag)
        !           870: 
        !           871: /* Nonzero in a FIELD_DECL means it is a bit field, and must be accessed
        !           872:    specially.  */
        !           873: #define DECL_BIT_FIELD(NODE) ((NODE)->decl.bit_field_flag)
        !           874: /* In a LABEL_DECL, nonzero means label was defined inside a binding
        !           875:    contour that restored a stack level and which is now exited.  */
        !           876: #define DECL_TOO_LATE(NODE) ((NODE)->decl.bit_field_flag)
        !           877: /* In a FUNCTION_DECL, nonzero means a built in function.  */
        !           878: #define DECL_BUILT_IN(NODE) ((NODE)->decl.bit_field_flag)
        !           879: /* In a VAR_DECL that's static,
        !           880:    nonzero if the space is in the text section.  */
        !           881: #define DECL_IN_TEXT_SECTION(NODE) ((NODE)->decl.bit_field_flag)
        !           882: 
        !           883: /* Used in VAR_DECLs to indicate that the variable is a vtable.
        !           884:    It is also used in FIELD_DECLs for vtable pointers.  */
        !           885: #define DECL_VIRTUAL_P(NODE) ((NODE)->decl.virtual_flag)
        !           886: 
        !           887: /* Additional flags for language-specific uses.  */
        !           888: #define DECL_LANG_FLAG_0(NODE) ((NODE)->decl.lang_flag_0)
        !           889: #define DECL_LANG_FLAG_1(NODE) ((NODE)->decl.lang_flag_1)
        !           890: #define DECL_LANG_FLAG_2(NODE) ((NODE)->decl.lang_flag_2)
        !           891: #define DECL_LANG_FLAG_3(NODE) ((NODE)->decl.lang_flag_3)
        !           892: #define DECL_LANG_FLAG_4(NODE) ((NODE)->decl.lang_flag_4)
        !           893: #define DECL_LANG_FLAG_5(NODE) ((NODE)->decl.lang_flag_5)
        !           894: #define DECL_LANG_FLAG_6(NODE) ((NODE)->decl.lang_flag_6)
        !           895: #define DECL_LANG_FLAG_7(NODE) ((NODE)->decl.lang_flag_7)
        !           896: 
        !           897: struct tree_decl
        !           898: {
        !           899:   char common[sizeof (struct tree_common)];
        !           900:   char *filename;
        !           901:   int linenum;
        !           902:   union tree_node *size;
        !           903:   unsigned int uid;
        !           904: #ifdef ONLY_INT_FIELDS
        !           905:   int mode : 8;
        !           906: #else
        !           907:   enum machine_mode mode : 8;
        !           908: #endif
        !           909: 
        !           910:   unsigned external_flag : 1;
        !           911:   unsigned nonlocal_flag : 1;
        !           912:   unsigned regdecl_flag : 1;
        !           913:   unsigned inline_flag : 1;
        !           914:   unsigned bit_field_flag : 1;
        !           915:   unsigned virtual_flag : 1;
        !           916:   unsigned ignored_flag : 1;
        !           917:   unsigned abstract_flag : 1;
        !           918: 
        !           919:   unsigned in_system_header_flag : 1;
        !           920:   /* room for seven more */
        !           921: 
        !           922:   unsigned lang_flag_0 : 1;
        !           923:   unsigned lang_flag_1 : 1;
        !           924:   unsigned lang_flag_2 : 1;
        !           925:   unsigned lang_flag_3 : 1;
        !           926:   unsigned lang_flag_4 : 1;
        !           927:   unsigned lang_flag_5 : 1;
        !           928:   unsigned lang_flag_6 : 1;
        !           929:   unsigned lang_flag_7 : 1;
        !           930: 
        !           931:   union tree_node *name;
        !           932:   union tree_node *context;
        !           933:   union tree_node *arguments;
        !           934:   union tree_node *result;
        !           935:   union tree_node *initial;
        !           936:   union tree_node *abstract_origin;
        !           937:   /* The PRINT_NAME field is marked for death.  */
        !           938:   char *print_name;
        !           939:   union tree_node *assembler_name;
        !           940:   struct rtx_def *rtl; /* acts as link to register transfer language
        !           941:                                   (rtl) info */
        !           942:   /* For a FUNCTION_DECL, if inline, this is the size of frame needed.
        !           943:      If built-in, this is the code for which built-in function.
        !           944:      For other kinds of decls, this is DECL_ALIGN.  */
        !           945:   int frame_size;
        !           946:   /* For FUNCTION_DECLs: points to insn that constitutes its definition
        !           947:      on the permanent obstack.  For any other kind of decl, this is the
        !           948:      alignment.  */
        !           949:   union {
        !           950:     struct rtx_def *r;
        !           951:     int i;
        !           952:   } saved_insns;
        !           953:   union tree_node *vindex;
        !           954:   /* Points to a structure whose details depend on the language in use.  */
        !           955:   struct lang_decl *lang_specific;
        !           956: };
        !           957: 
        !           958: /* Define the overall contents of a tree node.
        !           959:    It may be any of the structures declared above
        !           960:    for various types of node.  */
        !           961: 
        !           962: union tree_node
        !           963: {
        !           964:   struct tree_common common;
        !           965:   struct tree_int_cst int_cst;
        !           966:   struct tree_real_cst real_cst;
        !           967:   struct tree_string string;
        !           968:   struct tree_complex complex;
        !           969:   struct tree_identifier identifier;
        !           970:   struct tree_decl decl;
        !           971:   struct tree_type type;
        !           972:   struct tree_list list;
        !           973:   struct tree_vec vec;
        !           974:   struct tree_exp exp;
        !           975:   struct tree_block block;
        !           976:  };
        !           977: 
        !           978: /* Add prototype support.  */
        !           979: #ifndef PROTO
        !           980: #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
        !           981: #define PROTO(ARGS) ARGS
        !           982: #else
        !           983: #define PROTO(ARGS) ()
        !           984: #endif
        !           985: #endif
        !           986: 
        !           987: 
        !           988: #define NULL_TREE (tree) NULL
        !           989: 
        !           990: /* Define a generic NULL if one hasn't already been defined.  */
        !           991: 
        !           992: #ifndef NULL
        !           993: #define NULL 0
        !           994: #endif
        !           995: 
        !           996: #ifndef GENERIC_PTR
        !           997: #if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
        !           998: #define GENERIC_PTR void *
        !           999: #else
        !          1000: #define GENERIC_PTR char *
        !          1001: #endif
        !          1002: #endif
        !          1003: 
        !          1004: #ifndef NULL_PTR
        !          1005: #define NULL_PTR ((GENERIC_PTR)0)
        !          1006: #endif
        !          1007: 
        !          1008: /* The following functions accept a wide integer argument.  Rather than
        !          1009:    having to cast on every function call, we use a macro instead, that is
        !          1010:    defined here and in rtl.h.  */
        !          1011: 
        !          1012: #ifndef exact_log2
        !          1013: #define exact_log2(N) exact_log2_wide ((HOST_WIDE_INT) (N))
        !          1014: #define floor_log2(N) floor_log2_wide ((HOST_WIDE_INT) (N))
        !          1015: #endif
        !          1016: 
        !          1017: #if 0
        !          1018: /* At present, don't prototype xrealloc, since all of the callers don't
        !          1019:    cast their pointers to char *, and all of the xrealloc's don't use
        !          1020:    void * yet.  */
        !          1021: extern char *xmalloc                   PROTO((size_t));
        !          1022: extern char *xrealloc                  PROTO((void *, size_t));
        !          1023: #else
        !          1024: extern char *xmalloc ();
        !          1025: extern char *xrealloc ();
        !          1026: #endif
        !          1027: 
        !          1028: extern char *oballoc                   PROTO((int));
        !          1029: extern char *permalloc                 PROTO((int));
        !          1030: extern char *savealloc                 PROTO((int));
        !          1031: extern void free                       PROTO((void *));
        !          1032: 
        !          1033: /* Lowest level primitive for allocating a node.
        !          1034:    The TREE_CODE is the only argument.  Contents are initialized
        !          1035:    to zero except for a few of the common fields.  */
        !          1036: 
        !          1037: extern tree make_node                  PROTO((enum tree_code));
        !          1038: 
        !          1039: /* Make a copy of a node, with all the same contents except
        !          1040:    for TREE_PERMANENT.  (The copy is permanent
        !          1041:    iff nodes being made now are permanent.)  */
        !          1042: 
        !          1043: extern tree copy_node                  PROTO((tree));
        !          1044: 
        !          1045: /* Make a copy of a chain of TREE_LIST nodes.  */
        !          1046: 
        !          1047: extern tree copy_list                  PROTO((tree));
        !          1048: 
        !          1049: /* Make a TREE_VEC.  */
        !          1050: 
        !          1051: extern tree make_tree_vec              PROTO((int));
        !          1052: 
        !          1053: /* Return the (unique) IDENTIFIER_NODE node for a given name.
        !          1054:    The name is supplied as a char *.  */
        !          1055: 
        !          1056: extern tree get_identifier             PROTO((char *));
        !          1057: 
        !          1058: /* Construct various types of nodes.  */
        !          1059: 
        !          1060: #define build_int_2(LO,HI)  \
        !          1061:   build_int_2_wide ((HOST_WIDE_INT) (LO), (HOST_WIDE_INT) (HI))
        !          1062: 
        !          1063: #if 0
        !          1064: /* We cannot define prototypes for the variable argument functions,
        !          1065:    since they have not been ANSI-fied, and an ANSI compiler would
        !          1066:    complain when compiling the definition of these functions.  */
        !          1067: 
        !          1068: extern tree build                      PROTO((enum tree_code, tree, ...));
        !          1069: extern tree build_nt                   PROTO((enum tree_code, ...));
        !          1070: extern tree build_parse_node           PROTO((enum tree_code, ...));
        !          1071: #else
        !          1072: extern tree build ();
        !          1073: extern tree build_nt ();
        !          1074: extern tree build_parse_node ();
        !          1075: #endif
        !          1076: 
        !          1077: extern tree build_int_2_wide           PROTO((HOST_WIDE_INT, HOST_WIDE_INT));
        !          1078: extern tree build_real                 PROTO((tree, REAL_VALUE_TYPE));
        !          1079: extern tree build_real_from_int_cst    PROTO((tree, tree));
        !          1080: extern tree build_complex              PROTO((tree, tree));
        !          1081: extern tree build_string               PROTO((int, char *));
        !          1082: extern tree build1                     PROTO((enum tree_code, tree, tree));
        !          1083: extern tree build_tree_list            PROTO((tree, tree));
        !          1084: extern tree build_decl_list            PROTO((tree, tree));
        !          1085: extern tree build_decl                 PROTO((enum tree_code, tree, tree));
        !          1086: extern tree build_block                        PROTO((tree, tree, tree, tree, tree));
        !          1087: 
        !          1088: /* Construct various nodes representing data types.  */
        !          1089: 
        !          1090: extern tree make_signed_type           PROTO((int));
        !          1091: extern tree make_unsigned_type         PROTO((int));
        !          1092: extern tree signed_or_unsigned_type    PROTO((int, tree));
        !          1093: extern void fixup_unsigned_type                PROTO((tree));
        !          1094: extern tree build_pointer_type         PROTO((tree));
        !          1095: extern tree build_reference_type       PROTO((tree));
        !          1096: extern tree build_index_type           PROTO((tree));
        !          1097: extern tree build_index_2_type         PROTO((tree, tree));
        !          1098: extern tree build_array_type           PROTO((tree, tree));
        !          1099: extern tree build_function_type                PROTO((tree, tree));
        !          1100: extern tree build_method_type          PROTO((tree, tree));
        !          1101: extern tree build_offset_type          PROTO((tree, tree));
        !          1102: extern tree build_complex_type         PROTO((tree));
        !          1103: extern tree array_type_nelts           PROTO((tree));
        !          1104: 
        !          1105: extern tree value_member               PROTO((tree, tree));
        !          1106: extern tree purpose_member             PROTO((tree, tree));
        !          1107: extern tree binfo_member               PROTO((tree, tree));
        !          1108: extern int tree_int_cst_equal          PROTO((tree, tree));
        !          1109: extern int tree_int_cst_lt             PROTO((tree, tree));
        !          1110: extern int index_type_equal            PROTO((tree, tree));
        !          1111: 
        !          1112: /* From expmed.c.  Since rtl.h is included after tree.h, we can't
        !          1113:    put the prototype here.  Rtl.h does declare the prototype if
        !          1114:    tree.h had been included.  */
        !          1115: 
        !          1116: extern tree make_tree ();
        !          1117: 
        !          1118: /* Given a type node TYPE, and CONSTP and VOLATILEP, return a type
        !          1119:    for the same kind of data as TYPE describes.
        !          1120:    Variants point to the "main variant" (which has neither CONST nor VOLATILE)
        !          1121:    via TYPE_MAIN_VARIANT, and it points to a chain of other variants
        !          1122:    so that duplicate variants are never made.
        !          1123:    Only main variants should ever appear as types of expressions.  */
        !          1124: 
        !          1125: extern tree build_type_variant         PROTO((tree, int, int));
        !          1126: 
        !          1127: /* Make a copy of a type node.  */
        !          1128: 
        !          1129: extern tree build_type_copy            PROTO((tree));
        !          1130: 
        !          1131: /* Given a ..._TYPE node, calculate the TYPE_SIZE, TYPE_SIZE_UNIT,
        !          1132:    TYPE_ALIGN and TYPE_MODE fields.
        !          1133:    If called more than once on one node, does nothing except
        !          1134:    for the first time.  */
        !          1135: 
        !          1136: extern void layout_type                        PROTO((tree));
        !          1137: 
        !          1138: /* Given a hashcode and a ..._TYPE node (for which the hashcode was made),
        !          1139:    return a canonicalized ..._TYPE node, so that duplicates are not made.
        !          1140:    How the hash code is computed is up to the caller, as long as any two
        !          1141:    callers that could hash identical-looking type nodes agree.  */
        !          1142: 
        !          1143: extern tree type_hash_canon            PROTO((int, tree));
        !          1144: 
        !          1145: /* Given a VAR_DECL, PARM_DECL, RESULT_DECL or FIELD_DECL node,
        !          1146:    calculates the DECL_SIZE, DECL_SIZE_UNIT, DECL_ALIGN and DECL_MODE
        !          1147:    fields.  Call this only once for any given decl node.
        !          1148: 
        !          1149:    Second argument is the boundary that this field can be assumed to
        !          1150:    be starting at (in bits).  Zero means it can be assumed aligned
        !          1151:    on any boundary that may be needed.  */
        !          1152: 
        !          1153: extern void layout_decl                        PROTO((tree, unsigned));
        !          1154: 
        !          1155: /* Return an expr equal to X but certainly not valid as an lvalue.  */
        !          1156: 
        !          1157: extern tree non_lvalue                 PROTO((tree));
        !          1158: extern tree pedantic_non_lvalue                PROTO((tree));
        !          1159: 
        !          1160: extern tree convert                    PROTO((tree, tree));
        !          1161: extern tree size_in_bytes              PROTO((tree));
        !          1162: extern int int_size_in_bytes           PROTO((tree));
        !          1163: extern tree size_binop                 PROTO((enum tree_code, tree, tree));
        !          1164: extern tree size_int                   PROTO((unsigned));
        !          1165: extern tree round_up                   PROTO((tree, int));
        !          1166: extern tree get_pending_sizes          PROTO((void));
        !          1167: 
        !          1168: /* Type for sizes of data-type.  */
        !          1169: 
        !          1170: extern tree sizetype;
        !          1171: 
        !          1172: /* Concatenate two lists (chains of TREE_LIST nodes) X and Y
        !          1173:    by making the last node in X point to Y.
        !          1174:    Returns X, except if X is 0 returns Y.  */
        !          1175: 
        !          1176: extern tree chainon                    PROTO((tree, tree));
        !          1177: 
        !          1178: /* Make a new TREE_LIST node from specified PURPOSE, VALUE and CHAIN.  */
        !          1179: 
        !          1180: extern tree tree_cons                  PROTO((tree, tree, tree));
        !          1181: extern tree perm_tree_cons             PROTO((tree, tree, tree));
        !          1182: extern tree temp_tree_cons             PROTO((tree, tree, tree));
        !          1183: extern tree saveable_tree_cons         PROTO((tree, tree, tree));
        !          1184: extern tree decl_tree_cons             PROTO((tree, tree, tree));
        !          1185: 
        !          1186: /* Return the last tree node in a chain.  */
        !          1187: 
        !          1188: extern tree tree_last                  PROTO((tree));
        !          1189: 
        !          1190: /* Reverse the order of elements in a chain, and return the new head.  */
        !          1191: 
        !          1192: extern tree nreverse                   PROTO((tree));
        !          1193: 
        !          1194: /* Returns the length of a chain of nodes
        !          1195:    (number of chain pointers to follow before reaching a null pointer).  */
        !          1196: 
        !          1197: extern int list_length                 PROTO((tree));
        !          1198: 
        !          1199: /* integer_zerop (tree x) is nonzero if X is an integer constant of value 0 */
        !          1200: 
        !          1201: extern int integer_zerop               PROTO((tree));
        !          1202: 
        !          1203: /* integer_onep (tree x) is nonzero if X is an integer constant of value 1 */
        !          1204: 
        !          1205: extern int integer_onep                        PROTO((tree));
        !          1206: 
        !          1207: /* integer_all_onesp (tree x) is nonzero if X is an integer constant
        !          1208:    all of whose significant bits are 1.  */
        !          1209: 
        !          1210: extern int integer_all_onesp           PROTO((tree));
        !          1211: 
        !          1212: /* integer_pow2p (tree x) is nonzero is X is an integer constant with
        !          1213:    exactly one bit 1.  */
        !          1214: 
        !          1215: extern int integer_pow2p               PROTO((tree));
        !          1216: 
        !          1217: /* staticp (tree x) is nonzero if X is a reference to data allocated
        !          1218:    at a fixed address in memory.  */
        !          1219: 
        !          1220: extern int staticp                     PROTO((tree));
        !          1221: 
        !          1222: /* Gets an error if argument X is not an lvalue.
        !          1223:    Also returns 1 if X is an lvalue, 0 if not.  */
        !          1224: 
        !          1225: extern int lvalue_or_else              PROTO((tree, char *));
        !          1226: 
        !          1227: /* save_expr (EXP) returns an expression equivalent to EXP
        !          1228:    but it can be used multiple times within context CTX
        !          1229:    and only evaluate EXP once.  */
        !          1230: 
        !          1231: extern tree save_expr                  PROTO((tree));
        !          1232: 
        !          1233: /* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size
        !          1234:    or offset that depends on a field within a record.
        !          1235: 
        !          1236:    Note that we only allow such expressions within simple arithmetic
        !          1237:    or a COND_EXPR.  */
        !          1238: 
        !          1239: extern int contains_placeholder_p      PROTO((tree));
        !          1240: 
        !          1241: /* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
        !          1242:    return a tree with all occurrences of references to F in a
        !          1243:    PLACEHOLDER_EXPR replaced by R.   Note that we assume here that EXP
        !          1244:    contains only arithmetic expressions.  */
        !          1245: 
        !          1246: extern tree substitute_in_expr         PROTO((tree, tree, tree));
        !          1247: 
        !          1248: /* Given a type T, a FIELD_DECL F, and a replacement value R,
        !          1249:    return a new type with all size expressions that contain F
        !          1250:    updated by replacing the reference to F with R.  */
        !          1251: 
        !          1252: extern tree substitute_in_type         PROTO((tree, tree, tree));
        !          1253: 
        !          1254: /* variable_size (EXP) is like save_expr (EXP) except that it
        !          1255:    is for the special case of something that is part of a
        !          1256:    variable size for a data type.  It makes special arrangements
        !          1257:    to compute the value at the right time when the data type
        !          1258:    belongs to a function parameter.  */
        !          1259: 
        !          1260: extern tree variable_size              PROTO((tree));
        !          1261: 
        !          1262: /* stabilize_reference (EXP) returns an reference equivalent to EXP
        !          1263:    but it can be used multiple times
        !          1264:    and only evaluate the subexpressions once.  */
        !          1265: 
        !          1266: extern tree stabilize_reference                PROTO((tree));
        !          1267: 
        !          1268: /* Return EXP, stripped of any conversions to wider types
        !          1269:    in such a way that the result of converting to type FOR_TYPE
        !          1270:    is the same as if EXP were converted to FOR_TYPE.
        !          1271:    If FOR_TYPE is 0, it signifies EXP's type.  */
        !          1272: 
        !          1273: extern tree get_unwidened              PROTO((tree, tree));
        !          1274: 
        !          1275: /* Return OP or a simpler expression for a narrower value
        !          1276:    which can be sign-extended or zero-extended to give back OP.
        !          1277:    Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
        !          1278:    or 0 if the value should be sign-extended.  */
        !          1279: 
        !          1280: extern tree get_narrower               PROTO((tree, int *));
        !          1281: 
        !          1282: /* Given MODE and UNSIGNEDP, return a suitable type-tree
        !          1283:    with that mode.
        !          1284:    The definition of this resides in language-specific code
        !          1285:    as the repertoire of available types may vary.  */
        !          1286: 
        !          1287: extern tree type_for_mode              PROTO((enum machine_mode, int));
        !          1288: 
        !          1289: /* Given PRECISION and UNSIGNEDP, return a suitable type-tree
        !          1290:    for an integer type with at least that precision.
        !          1291:    The definition of this resides in language-specific code
        !          1292:    as the repertoire of available types may vary.  */
        !          1293: 
        !          1294: extern tree type_for_size              PROTO((unsigned, int));
        !          1295: 
        !          1296: /* Given an integer type T, return a type like T but unsigned.
        !          1297:    If T is unsigned, the value is T.
        !          1298:    The definition of this resides in language-specific code
        !          1299:    as the repertoire of available types may vary.  */
        !          1300: 
        !          1301: extern tree unsigned_type              PROTO((tree));
        !          1302: 
        !          1303: /* Given an integer type T, return a type like T but signed.
        !          1304:    If T is signed, the value is T.
        !          1305:    The definition of this resides in language-specific code
        !          1306:    as the repertoire of available types may vary.  */
        !          1307: 
        !          1308: extern tree signed_type                        PROTO((tree));
        !          1309: 
        !          1310: /* This function must be defined in the language-specific files.
        !          1311:    expand_expr calls it to build the cleanup-expression for a TARGET_EXPR.
        !          1312:    This is defined in a language-specific file.  */
        !          1313: 
        !          1314: extern tree maybe_build_cleanup                PROTO((tree));
        !          1315: 
        !          1316: /* Given an expression EXP that may be a COMPONENT_REF or an ARRAY_REF,
        !          1317:    look for nested component-refs or array-refs at constant positions
        !          1318:    and find the ultimate containing object, which is returned.  */
        !          1319: 
        !          1320: extern tree get_inner_reference                PROTO((tree, int *, int *, tree *, enum machine_mode *, int *, int *));
        !          1321: 
        !          1322: /* Return the FUNCTION_DECL which provides this _DECL with its context,
        !          1323:    or zero if none.  */
        !          1324: extern tree decl_function_context      PROTO((tree));
        !          1325: 
        !          1326: /* Return the RECORD_TYPE, UNION_TYPE, or QUAL_UNION_TYPE which provides
        !          1327:    this _DECL with its context, or zero if none.  */
        !          1328: extern tree decl_type_context          PROTO((tree));
        !          1329: 
        !          1330: /* Given the FUNCTION_DECL for the current function,
        !          1331:    return zero if it is ok for this function to be inline.
        !          1332:    Otherwise return a warning message with a single %s
        !          1333:    for the function's name.  */
        !          1334: 
        !          1335: extern char *function_cannot_inline_p  PROTO((tree));
        !          1336: 
        !          1337: /* Return 1 if EXPR is the real constant zero.  */
        !          1338: extern int real_zerop PROTO((tree));
        !          1339: 
        !          1340: /* Declare commonly used variables for tree structure.  */
        !          1341: 
        !          1342: /* An integer constant with value 0 */
        !          1343: extern tree integer_zero_node;
        !          1344: 
        !          1345: /* An integer constant with value 1 */
        !          1346: extern tree integer_one_node;
        !          1347: 
        !          1348: /* An integer constant with value 0 whose type is sizetype.  */
        !          1349: extern tree size_zero_node;
        !          1350: 
        !          1351: /* An integer constant with value 1 whose type is sizetype.  */
        !          1352: extern tree size_one_node;
        !          1353: 
        !          1354: /* A constant of type pointer-to-int and value 0 */
        !          1355: extern tree null_pointer_node;
        !          1356: 
        !          1357: /* A node of type ERROR_MARK.  */
        !          1358: extern tree error_mark_node;
        !          1359: 
        !          1360: /* The type node for the void type.  */
        !          1361: extern tree void_type_node;
        !          1362: 
        !          1363: /* The type node for the ordinary (signed) integer type.  */
        !          1364: extern tree integer_type_node;
        !          1365: 
        !          1366: /* The type node for the unsigned integer type.  */
        !          1367: extern tree unsigned_type_node;
        !          1368: 
        !          1369: /* The type node for the ordinary character type.  */
        !          1370: extern tree char_type_node;
        !          1371: 
        !          1372: /* Points to the name of the input file from which the current input
        !          1373:    being parsed originally came (before it went into cpp).  */
        !          1374: extern char *input_filename;
        !          1375: 
        !          1376: /* Current line number in input file.  */
        !          1377: extern int lineno;
        !          1378: 
        !          1379: /* Nonzero for -pedantic switch: warn about anything
        !          1380:    that standard C forbids.  */
        !          1381: extern int pedantic;
        !          1382: 
        !          1383: /* Nonzero means can safely call expand_expr now;
        !          1384:    otherwise layout_type puts variable sizes onto `pending_sizes' instead.  */
        !          1385: 
        !          1386: extern int immediate_size_expand;
        !          1387: 
        !          1388: /* Points to the FUNCTION_DECL of the function whose body we are reading. */
        !          1389: 
        !          1390: extern tree current_function_decl;
        !          1391: 
        !          1392: /* Nonzero if function being compiled can call setjmp.  */
        !          1393: 
        !          1394: extern int current_function_calls_setjmp;
        !          1395: 
        !          1396: /* Nonzero if function being compiled can call longjmp.  */
        !          1397: 
        !          1398: extern int current_function_calls_longjmp;
        !          1399: 
        !          1400: /* Nonzero means all ..._TYPE nodes should be allocated permanently.  */
        !          1401: 
        !          1402: extern int all_types_permanent;
        !          1403: 
        !          1404: /* Pointer to function to compute the name to use to print a declaration.  */
        !          1405: 
        !          1406: extern char *(*decl_printable_name) ();
        !          1407: 
        !          1408: /* Pointer to function to finish handling an incomplete decl at the
        !          1409:    end of compilation.  */
        !          1410: 
        !          1411: extern void (*incomplete_decl_finalize_hook) ();
        !          1412: 
        !          1413: /* In tree.c */
        !          1414: extern char *perm_calloc                       PROTO((int, long));
        !          1415: 
        !          1416: /* In stmt.c */
        !          1417: 
        !          1418: extern tree expand_start_stmt_expr             PROTO((void));
        !          1419: extern tree expand_end_stmt_expr               PROTO((tree));
        !          1420: extern void expand_expr_stmt                   PROTO((tree));
        !          1421: extern void expand_decl_init                   PROTO((tree));
        !          1422: extern void clear_last_expr                    PROTO((void));
        !          1423: extern void expand_label                       PROTO((tree));
        !          1424: extern void expand_goto                                PROTO((tree));
        !          1425: extern void expand_asm                         PROTO((tree));
        !          1426: extern void expand_start_cond                  PROTO((tree, int));
        !          1427: extern void expand_end_cond                    PROTO((void));
        !          1428: extern void expand_start_else                  PROTO((void));
        !          1429: extern void expand_start_elseif                        PROTO((tree));
        !          1430: extern struct nesting *expand_start_loop       PROTO((int));
        !          1431: extern struct nesting *expand_start_loop_continue_elsewhere    PROTO((int));
        !          1432: extern void expand_loop_continue_here          PROTO((void));
        !          1433: extern void expand_end_loop                    PROTO((void));
        !          1434: extern int expand_continue_loop                        PROTO((struct nesting *));
        !          1435: extern int expand_exit_loop                    PROTO((struct nesting *));
        !          1436: extern int expand_exit_loop_if_false           PROTO((struct nesting *, tree));
        !          1437: extern int expand_exit_something               PROTO((void));
        !          1438: 
        !          1439: extern void expand_null_return                 PROTO((void));
        !          1440: extern void expand_return                      PROTO((tree));
        !          1441: extern void expand_start_bindings              PROTO((int));
        !          1442: extern void expand_end_bindings                        PROTO((tree, int, int));
        !          1443: extern tree last_cleanup_this_contour          PROTO((void));
        !          1444: extern void expand_start_case                  PROTO((int, tree, tree, char *));
        !          1445: extern void expand_end_case                    PROTO((tree));
        !          1446: extern int pushcase                            PROTO((tree, tree (*) (tree, tree), tree, tree *));
        !          1447: extern int pushcase_range                      PROTO((tree, tree, tree (*) (tree, tree), tree, tree *));
        !          1448: 
        !          1449: /* In fold-const.c */
        !          1450: 
        !          1451: /* Fold constants as much as possible in an expression.
        !          1452:    Returns the simplified expression.
        !          1453:    Acts only on the top level of the expression;
        !          1454:    if the argument itself cannot be simplified, its
        !          1455:    subexpressions are not changed.  */
        !          1456: 
        !          1457: extern tree fold               PROTO((tree));
        !          1458: 
        !          1459: extern int force_fit_type      PROTO((tree, int));
        !          1460: extern int add_double          PROTO((HOST_WIDE_INT, HOST_WIDE_INT,
        !          1461:                                       HOST_WIDE_INT, HOST_WIDE_INT,
        !          1462:                                       HOST_WIDE_INT *, HOST_WIDE_INT *));
        !          1463: extern int neg_double          PROTO((HOST_WIDE_INT, HOST_WIDE_INT,
        !          1464:                                       HOST_WIDE_INT *, HOST_WIDE_INT *));
        !          1465: extern int mul_double          PROTO((HOST_WIDE_INT, HOST_WIDE_INT,
        !          1466:                                       HOST_WIDE_INT, HOST_WIDE_INT,
        !          1467:                                       HOST_WIDE_INT *, HOST_WIDE_INT *));
        !          1468: extern void lshift_double      PROTO((HOST_WIDE_INT, HOST_WIDE_INT,
        !          1469:                                       HOST_WIDE_INT, int, HOST_WIDE_INT *,
        !          1470:                                       HOST_WIDE_INT *, int));
        !          1471: extern void rshift_double      PROTO((HOST_WIDE_INT, HOST_WIDE_INT,
        !          1472:                                       HOST_WIDE_INT, int,
        !          1473:                                       HOST_WIDE_INT *, HOST_WIDE_INT *, int));
        !          1474: extern void lrotate_double     PROTO((HOST_WIDE_INT, HOST_WIDE_INT,
        !          1475:                                       HOST_WIDE_INT, int, HOST_WIDE_INT *,
        !          1476:                                       HOST_WIDE_INT *));
        !          1477: extern void rrotate_double     PROTO((HOST_WIDE_INT, HOST_WIDE_INT,
        !          1478:                                       HOST_WIDE_INT, int, HOST_WIDE_INT *,
        !          1479:                                       HOST_WIDE_INT *));
        !          1480: extern int operand_equal_p     PROTO((tree, tree, int));
        !          1481: extern tree invert_truthvalue  PROTO((tree));
        !          1482: 
        !          1483: /* The language front-end must define these functions.  */
        !          1484: 
        !          1485: /* Function of no arguments for initializing lexical scanning.  */
        !          1486: extern void init_lex                           PROTO((void));
        !          1487: /* Function of no arguments for initializing the symbol table.  */
        !          1488: extern void init_decl_processing               PROTO((void));
        !          1489: 
        !          1490: /* Functions called with no arguments at the beginning and end or processing
        !          1491:    the input source file.  */
        !          1492: extern void lang_init                          PROTO((void));
        !          1493: extern void lang_finish                                PROTO((void));
        !          1494: 
        !          1495: /* Funtion to identify which front-end produced the output file. */
        !          1496: extern char *lang_identify                     PROTO((void));
        !          1497: 
        !          1498: /* Function called with no arguments to parse and compile the input.  */
        !          1499: extern int yyparse                             PROTO((void));
        !          1500: /* Function called with option as argument
        !          1501:    to decode options starting with -f or -W or +.
        !          1502:    It should return nonzero if it handles the option.  */
        !          1503: extern int lang_decode_option                  PROTO((char *));
        !          1504: 
        !          1505: /* Functions for processing symbol declarations.  */
        !          1506: /* Function to enter a new lexical scope.
        !          1507:    Takes one argument: always zero when called from outside the front end.  */
        !          1508: extern void pushlevel                          PROTO((int));
        !          1509: /* Function to exit a lexical scope.  It returns a BINDING for that scope.
        !          1510:    Takes three arguments:
        !          1511:      KEEP -- nonzero if there were declarations in this scope.
        !          1512:      REVERSE -- reverse the order of decls before returning them.
        !          1513:      FUNCTIONBODY -- nonzero if this level is the body of a function.  */
        !          1514: extern tree poplevel                           PROTO((int, int, int));
        !          1515: /* Set the BLOCK node for the current scope level.  */
        !          1516: extern void set_block                          PROTO((tree));
        !          1517: /* Function to add a decl to the current scope level.
        !          1518:    Takes one argument, a decl to add.
        !          1519:    Returns that decl, or, if the same symbol is already declared, may
        !          1520:    return a different decl for that name.  */
        !          1521: extern tree pushdecl                           PROTO((tree));
        !          1522: /* Function to return the chain of decls so far in the current scope level.  */
        !          1523: extern tree getdecls                           PROTO((void));
        !          1524: /* Function to return the chain of structure tags in the current scope level.  */
        !          1525: extern tree gettags                            PROTO((void));
        !          1526: 
        !          1527: extern tree build_range_type PROTO((tree, tree, tree));
        !          1528: 
        !          1529: /* Call when starting to parse a declaration:
        !          1530:    make expressions in the declaration last the length of the function.
        !          1531:    Returns an argument that should be passed to resume_momentary later.  */
        !          1532: extern int suspend_momentary PROTO((void));
        !          1533: 
        !          1534: extern int allocation_temporary_p PROTO((void));
        !          1535: 
        !          1536: /* Call when finished parsing a declaration:
        !          1537:    restore the treatment of node-allocation that was
        !          1538:    in effect before the suspension.
        !          1539:    YES should be the value previously returned by suspend_momentary.  */
        !          1540: extern void resume_momentary PROTO((int));
        !          1541: 
        !          1542: /* Called after finishing a record, union or enumeral type.  */
        !          1543: extern void rest_of_type_compilation PROTO((tree, int));
        !          1544: 
        !          1545: /* Save the current set of obstacks, but don't change them.  */
        !          1546: extern void push_obstacks_nochange PROTO((void));
        !          1547: 
        !          1548: extern void push_momentary PROTO((void));
        !          1549: 
        !          1550: extern void clear_momentary PROTO((void));
        !          1551: 
        !          1552: extern void pop_momentary PROTO((void));
        !          1553: 
        !          1554: extern void end_temporary_allocation PROTO((void));
        !          1555: 
        !          1556: /* Pop the obstack selection stack.  */
        !          1557: extern void pop_obstacks PROTO((void));

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