/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- * * The contents of this file are subject to the Netscape 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/NPL/ * * 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 Netscape are * Copyright (C) 1998 Netscape Communications Corporation. All * Rights Reserved. * * Contributor(s): * * Alternatively, the contents of this file may be used under the * terms of the GNU Public License (the "GPL"), in which case the * provisions of the GPL are applicable instead of those above. * If you wish to allow use of your version of this file only * under the terms of the GPL and not to allow others to use your * version of this file under the NPL, indicate your decision by * deleting the provisions above and replace them with the notice * and other provisions required by the GPL. If you do not delete * the provisions above, a recipient may use your version of this * file under either the NPL or the GPL. */ #ifndef jsparse_h___ #define jsparse_h___ /* * JS parser definitions. */ #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 * > so that code generation can emit a left-associative branch * around when A is false). Nodes are labeled by token type, with a * JSOp secondary label when needed: * * Label Variant Members * ----- ------- ------- * * TOK_FUNCTION func pn_fun: function, contains arg and var properties * NB: We create the function object at parse (not * emit) time, in order 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 * * * 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 * 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' * 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 and * 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 * * * 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 * 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 . * 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: true 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 * 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 */ 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 { JSTokenType pn_type; JSTokenPos pn_pos; JSOp pn_op; ptrdiff_t pn_offset; /* first generated bytecode offset */ JSParseNodeArity pn_arity; union { struct { /* TOK_FUNCTION node */ JSFunction *fun; /* function object private data */ 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 */ JSBool 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; jsdouble dval; /* aligned numeric literal value */ } pn_u; JSParseNode *pn_next; /* to align dval and pn_u on RISCs */ }; #define pn_fun pn_u.func.fun #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 /* * 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 = 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; \ 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); JS_END_EXTERN_C #endif /* jsparse_h___ */