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- /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
- *
- * ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is Mozilla Communicator client code, released
- * March 31, 1998.
- *
- * The Initial Developer of the Original Code is
- * Netscape Communications Corporation.
- * Portions created by the Initial Developer are Copyright (C) 1998
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either of the GNU General Public License Version 2 or later (the "GPL"),
- * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
- #ifndef jsparse_h___
- #define jsparse_h___
- /*
- * JS parser definitions.
- */
- #include "jsconfig.h"
- #include "jsprvtd.h"
- #include "jspubtd.h"
- #include "jsscan.h"
-
- JS_BEGIN_EXTERN_C
-
- /*
- * Parsing builds a tree of nodes that directs code generation. This tree is
- * not a concrete syntax tree in all respects (for example, || and && are left
- * associative, but (A && B && C) translates into the right-associated tree
- * <A && <B && C>> so that code generation can emit a left-associative branch
- * around <B && C> when A is false). Nodes are labeled by token type, with a
- * JSOp secondary label when needed:
- *
- * Label Variant Members
- * ----- ------- -------
- * <Definitions>
- * TOK_FUNCTION func pn_funAtom: atom holding function object containing
- * arg and var properties. We create the function
- * object at parse (not emit) time to specialize arg
- * and var bytecodes early.
- * pn_body: TOK_LC node for function body statements
- * pn_flags: TCF_FUN_* flags (see jsemit.h) collected
- * while parsing the function's body
- * pn_tryCount: of try statements in function
- *
- * <Statements>
- * TOK_LC list pn_head: list of pn_count statements
- * TOK_EXPORT list pn_head: list of pn_count TOK_NAMEs or one TOK_STAR
- * (which is not a multiply node)
- * TOK_IMPORT list pn_head: list of pn_count sub-trees of the form
- * a.b.*, a[b].*, a.*, a.b, or a[b] -- but never a.
- * Each member is expressed with TOK_DOT or TOK_LB.
- * Each sub-tree's root node has a pn_op in the set
- * JSOP_IMPORT{ALL,PROP,ELEM}
- * TOK_IF ternary pn_kid1: cond, pn_kid2: then, pn_kid3: else or null
- * TOK_SWITCH binary pn_left: discriminant
- * pn_right: list of TOK_CASE nodes, with at most one
- * TOK_DEFAULT node
- * TOK_CASE, binary pn_left: case expr or null if TOK_DEFAULT
- * TOK_DEFAULT pn_right: TOK_LC node for this case's statements
- * pn_val: constant value if lookup or table switch
- * TOK_WHILE binary pn_left: cond, pn_right: body
- * TOK_DO binary pn_left: body, pn_right: cond
- * TOK_FOR binary pn_left: either
- * for/in loop: a binary TOK_IN node with
- * pn_left: TOK_VAR or TOK_NAME to left of 'in'
- * if TOK_VAR, its pn_extra may have PNX_POPVAR
- * and PNX_FORINVAR bits set
- * pn_right: object expr to right of 'in'
- * for(;;) loop: a ternary TOK_RESERVED node with
- * pn_kid1: init expr before first ';'
- * pn_kid2: cond expr before second ';'
- * pn_kid3: update expr after second ';'
- * any kid may be null
- * pn_right: body
- * TOK_THROW unary pn_op: JSOP_THROW, pn_kid: exception
- * TOK_TRY ternary pn_kid1: try block
- * pn_kid2: catch blocks or null
- * pn_kid3: finally block or null
- * TOK_CATCH ternary pn_kid1: PN_NAME node for catch var (with pn_expr
- * null or the catch guard expression)
- * pn_kid2: more catch blocks or null
- * pn_kid3: catch block statements
- * TOK_BREAK name pn_atom: label or null
- * TOK_CONTINUE name pn_atom: label or null
- * TOK_WITH binary pn_left: head expr, pn_right: body
- * TOK_VAR list pn_head: list of pn_count TOK_NAME nodes
- * each name node has
- * pn_atom: variable name
- * pn_expr: initializer or null
- * TOK_RETURN unary pn_kid: return expr or null
- * TOK_SEMI unary pn_kid: expr or null statement
- * TOK_COLON name pn_atom: label, pn_expr: labeled statement
- *
- * <Expressions>
- * All left-associated binary trees of the same type are optimized into lists
- * to avoid recursion when processing expression chains.
- * TOK_COMMA list pn_head: list of pn_count comma-separated exprs
- * TOK_ASSIGN binary pn_left: lvalue, pn_right: rvalue
- * pn_op: JSOP_ADD for +=, etc.
- * TOK_HOOK ternary pn_kid1: cond, pn_kid2: then, pn_kid3: else
- * TOK_OR binary pn_left: first in || chain, pn_right: rest of chain
- * TOK_AND binary pn_left: first in && chain, pn_right: rest of chain
- * TOK_BITOR binary pn_left: left-assoc | expr, pn_right: ^ expr
- * TOK_BITXOR binary pn_left: left-assoc ^ expr, pn_right: & expr
- * TOK_BITAND binary pn_left: left-assoc & expr, pn_right: EQ expr
- * TOK_EQOP binary pn_left: left-assoc EQ expr, pn_right: REL expr
- * pn_op: JSOP_EQ, JSOP_NE, JSOP_NEW_EQ, JSOP_NEW_NE
- * TOK_RELOP binary pn_left: left-assoc REL expr, pn_right: SH expr
- * pn_op: JSOP_LT, JSOP_LE, JSOP_GT, JSOP_GE
- * TOK_SHOP binary pn_left: left-assoc SH expr, pn_right: ADD expr
- * pn_op: JSOP_LSH, JSOP_RSH, JSOP_URSH
- * TOK_PLUS, binary pn_left: left-assoc ADD expr, pn_right: MUL expr
- * pn_extra: if a left-associated binary TOK_PLUS
- * tree has been flattened into a list (see above
- * under <Expressions>), pn_extra will contain
- * PNX_STRCAT if at least one list element is a
- * string literal (TOK_STRING); if such a list has
- * any non-string, non-number term, pn_extra will
- * contain PNX_CANTFOLD.
- * pn_
- * TOK_MINUS pn_op: JSOP_ADD, JSOP_SUB
- * TOK_STAR, binary pn_left: left-assoc MUL expr, pn_right: UNARY expr
- * TOK_DIVOP pn_op: JSOP_MUL, JSOP_DIV, JSOP_MOD
- * TOK_UNARYOP unary pn_kid: UNARY expr, pn_op: JSOP_NEG, JSOP_POS,
- * JSOP_NOT, JSOP_BITNOT, JSOP_TYPEOF, JSOP_VOID
- * TOK_INC, unary pn_kid: MEMBER expr
- * TOK_DEC
- * TOK_NEW list pn_head: list of ctor, arg1, arg2, ... argN
- * pn_count: 1 + N (where N is number of args)
- * ctor is a MEMBER expr
- * TOK_DELETE unary pn_kid: MEMBER expr
- * TOK_DOT, name pn_expr: MEMBER expr to left of .
- * TOK_DBLDOT pn_atom: name to right of .
- * TOK_LB binary pn_left: MEMBER expr to left of [
- * pn_right: expr between [ and ]
- * TOK_LP list pn_head: list of call, arg1, arg2, ... argN
- * pn_count: 1 + N (where N is number of args)
- * call is a MEMBER expr naming a callable object
- * TOK_RB list pn_head: list of pn_count array element exprs
- * [,,] holes are represented by TOK_COMMA nodes
- * #n=[...] produces TOK_DEFSHARP at head of list
- * pn_extra: PN_ENDCOMMA if extra comma at end
- * TOK_RC list pn_head: list of pn_count TOK_COLON nodes where
- * each has pn_left: property id, pn_right: value
- * #n={...} produces TOK_DEFSHARP at head of list
- * TOK_DEFSHARP unary pn_num: jsint value of n in #n=
- * pn_kid: null for #n=[...] and #n={...}, primary
- * if #n=primary for function, paren, name, object
- * literal expressions
- * TOK_USESHARP nullary pn_num: jsint value of n in #n#
- * TOK_RP unary pn_kid: parenthesized expression
- * TOK_NAME, name pn_atom: name, string, or object atom
- * TOK_STRING, pn_op: JSOP_NAME, JSOP_STRING, or JSOP_OBJECT, or
- * JSOP_REGEXP
- * TOK_OBJECT If JSOP_NAME, pn_op may be JSOP_*ARG or JSOP_*VAR
- * with pn_slot >= 0 and pn_attrs telling const-ness
- * TOK_NUMBER dval pn_dval: double value of numeric literal
- * TOK_PRIMARY nullary pn_op: JSOp bytecode
- * TOK_ANYNAME nullary pn_op: JSOP_ANYNAME
- * pn_atom: cx->runtime->atomState.starAtom
- * TOK_AT unary pn_op: JSOP_TOATTRNAME; pn_kid attribute id/expr
- * TOK_DBLCOLON binary pn_op: JSOP_QNAME
- * pn_left: TOK_ANYNAME or TOK_NAME node
- * pn_right: TOK_STRING "*" node, or expr within []
- * name pn_op: JSOP_QNAMECONST
- * pn_expr: TOK_ANYNAME or TOK_NAME left operand
- * pn_atom: name on right of ::
- * TOK_XMLELEM list XML element node
- * pn_head: start tag, content1, ... contentN, end tag
- * pn_count: 2 + N where N is number of content nodes
- * N may be > x.length() if {expr} embedded
- * TOK_XMLLIST list XML list node
- * pn_head: content1, ... contentN
- * TOK_XMLSTAGO, list XML start, end, and point tag contents
- * TOK_XMLETAGC, pn_head: tag name or {expr}, ... XML attrs ...
- * TOK_XMLPTAGO
- * TOK_XMLNAME nullary pn_atom: XML name, with no {expr} embedded
- * TOK_XMLNAME list pn_head: tag name or {expr}, ... name or {expr}
- * TOK_XMLATTR, nullary pn_atom: attribute value string; pn_op: JSOP_STRING
- * TOK_XMLCDATA,
- * TOK_XMLCOMMENT
- * TOK_XMLPI nullary pn_atom: XML processing instruction target
- * pn_atom2: XML PI content, or null if no content
- * TOK_XMLTEXT nullary pn_atom: marked-up text, or null if empty string
- * TOK_LC unary {expr} in XML tag or content; pn_kid is expr
- *
- * So an XML tag with no {expr} and three attributes is a list with the form:
- *
- * (tagname attrname1 attrvalue1 attrname2 attrvalue2 attrname2 attrvalue3)
- *
- * An XML tag with embedded expressions like so:
- *
- * <name1{expr1} name2{expr2}name3={expr3}>
- *
- * would have the form:
- *
- * ((name1 {expr1}) (name2 {expr2} name3) {expr3})
- *
- * where () bracket a list with elements separated by spaces, and {expr} is a
- * TOK_LC unary node with expr as its kid.
- *
- * Thus, the attribute name/value pairs occupy successive odd and even list
- * locations, where pn_head is the TOK_XMLNAME node at list location 0. The
- * parser builds the same sort of structures for elements:
- *
- * <a x={x}>Hi there!<b y={y}>How are you?</b><answer>{x + y}</answer></a>
- *
- * translates to:
- *
- * ((a x {x}) 'Hi there!' ((b y {y}) 'How are you?') ((answer) {x + y}))
- */
- typedef enum JSParseNodeArity {
- PN_FUNC = -3,
- PN_LIST = -2,
- PN_TERNARY = 3,
- PN_BINARY = 2,
- PN_UNARY = 1,
- PN_NAME = -1,
- PN_NULLARY = 0
- } JSParseNodeArity;
-
- struct JSParseNode {
- uint16 pn_type;
- uint8 pn_op;
- int8 pn_arity;
- JSTokenPos pn_pos;
- ptrdiff_t pn_offset; /* first generated bytecode offset */
- union {
- struct { /* TOK_FUNCTION node */
- JSAtom *funAtom; /* atomized function object */
- JSParseNode *body; /* TOK_LC list of statements */
- uint32 flags; /* accumulated tree context flags */
- uint32 tryCount; /* count of try statements in body */
- } func;
- struct { /* list of next-linked nodes */
- JSParseNode *head; /* first node in list */
- JSParseNode **tail; /* ptr to ptr to last node in list */
- uint32 count; /* number of nodes in list */
- uint32 extra; /* extra comma flag for [1,2,,] */
- } list;
- struct { /* ternary: if, for(;;), ?: */
- JSParseNode *kid1; /* condition, discriminant, etc. */
- JSParseNode *kid2; /* then-part, case list, etc. */
- JSParseNode *kid3; /* else-part, default case, etc. */
- } ternary;
- struct { /* two kids if binary */
- JSParseNode *left;
- JSParseNode *right;
- jsval val; /* switch case value */
- } binary;
- struct { /* one kid if unary */
- JSParseNode *kid;
- jsint num; /* -1 or sharp variable number */
- } unary;
- struct { /* name, labeled statement, etc. */
- JSAtom *atom; /* name or label atom, null if slot */
- JSParseNode *expr; /* object or initializer */
- jsint slot; /* -1 or arg or local var slot */
- uintN attrs; /* attributes if local var or const */
- } name;
- struct {
- JSAtom *atom; /* first atom in pair */
- JSAtom *atom2; /* second atom in pair or null */
- } apair;
- jsdouble dval; /* aligned numeric literal value */
- } pn_u;
- JSParseNode *pn_next; /* to align dval and pn_u on RISCs */
- #if JS_HAS_XML_SUPPORT
- JSTokenStream *pn_ts; /* token stream for XML error reports */
- #endif
- };
-
- #define pn_funAtom pn_u.func.funAtom
- #define pn_body pn_u.func.body
- #define pn_flags pn_u.func.flags
- #define pn_tryCount pn_u.func.tryCount
- #define pn_head pn_u.list.head
- #define pn_tail pn_u.list.tail
- #define pn_count pn_u.list.count
- #define pn_extra pn_u.list.extra
- #define pn_kid1 pn_u.ternary.kid1
- #define pn_kid2 pn_u.ternary.kid2
- #define pn_kid3 pn_u.ternary.kid3
- #define pn_left pn_u.binary.left
- #define pn_right pn_u.binary.right
- #define pn_val pn_u.binary.val
- #define pn_kid pn_u.unary.kid
- #define pn_num pn_u.unary.num
- #define pn_atom pn_u.name.atom
- #define pn_expr pn_u.name.expr
- #define pn_slot pn_u.name.slot
- #define pn_attrs pn_u.name.attrs
- #define pn_dval pn_u.dval
- #define pn_atom2 pn_u.apair.atom2
-
- /* PN_LIST pn_extra flags. */
- #define PNX_STRCAT 0x01 /* TOK_PLUS list has string term */
- #define PNX_CANTFOLD 0x02 /* TOK_PLUS list has unfoldable term */
- #define PNX_POPVAR 0x04 /* TOK_VAR last result needs popping */
- #define PNX_FORINVAR 0x08 /* TOK_VAR is left kid of TOK_IN node,
- which is left kid of TOK_FOR */
- #define PNX_ENDCOMMA 0x10 /* array literal has comma at end */
- #define PNX_XMLROOT 0x20 /* top-most node in XML literal tree */
-
- /*
- * Move pn2 into pn, preserving pn->pn_pos and pn->pn_offset and handing off
- * any kids in pn2->pn_u, by clearing pn2.
- */
- #define PN_MOVE_NODE(pn, pn2) \
- JS_BEGIN_MACRO \
- (pn)->pn_type = (pn2)->pn_type; \
- (pn)->pn_op = (pn2)->pn_op; \
- (pn)->pn_arity = (pn2)->pn_arity; \
- (pn)->pn_u = (pn2)->pn_u; \
- PN_CLEAR_NODE(pn2); \
- JS_END_MACRO
-
- #define PN_CLEAR_NODE(pn) \
- JS_BEGIN_MACRO \
- (pn)->pn_type = TOK_EOF; \
- (pn)->pn_op = JSOP_NOP; \
- (pn)->pn_arity = PN_NULLARY; \
- JS_END_MACRO
-
- /* True if pn is a parsenode representing a literal constant. */
- #define PN_IS_CONSTANT(pn) \
- ((pn)->pn_type == TOK_NUMBER || \
- (pn)->pn_type == TOK_STRING || \
- ((pn)->pn_type == TOK_PRIMARY && (pn)->pn_op != JSOP_THIS))
-
- /*
- * Compute a pointer to the last JSParseNode element in a singly-linked list.
- * NB: list must be non-empty for correct PN_LAST usage!
- */
- #define PN_LAST(list) \
- ((JSParseNode *)((char *)(list)->pn_tail - offsetof(JSParseNode, pn_next)))
-
- #define PN_INIT_LIST(list) \
- JS_BEGIN_MACRO \
- (list)->pn_head = NULL; \
- (list)->pn_tail = &(list)->pn_head; \
- (list)->pn_count = (list)->pn_extra = 0; \
- JS_END_MACRO
-
- #define PN_INIT_LIST_1(list, pn) \
- JS_BEGIN_MACRO \
- (list)->pn_head = (pn); \
- (list)->pn_tail = &(pn)->pn_next; \
- (list)->pn_count = 1; \
- (list)->pn_extra = 0; \
- JS_END_MACRO
-
- #define PN_APPEND(list, pn) \
- JS_BEGIN_MACRO \
- *(list)->pn_tail = (pn); \
- (list)->pn_tail = &(pn)->pn_next; \
- (list)->pn_count++; \
- JS_END_MACRO
-
- /*
- * Parse a top-level JS script.
- *
- * The caller must prevent the GC from running while this function is active,
- * because atoms and function newborns are not rooted yet.
- */
- extern JS_FRIEND_API(JSParseNode *)
- js_ParseTokenStream(JSContext *cx, JSObject *chain, JSTokenStream *ts);
-
- extern JS_FRIEND_API(JSBool)
- js_CompileTokenStream(JSContext *cx, JSObject *chain, JSTokenStream *ts,
- JSCodeGenerator *cg);
-
- extern JSBool
- js_CompileFunctionBody(JSContext *cx, JSTokenStream *ts, JSFunction *fun);
-
- extern JSBool
- js_FoldConstants(JSContext *cx, JSParseNode *pn, JSTreeContext *tc);
-
- #if JS_HAS_XML_SUPPORT
- JS_FRIEND_API(JSParseNode *)
- js_ParseXMLTokenStream(JSContext *cx, JSObject *chain, JSTokenStream *ts,
- JSBool allowList);
- #endif
-
- JS_END_EXTERN_C
-
- #endif /* jsparse_h___ */
-