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1.1 root 1: /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- 1.1.1.2 ! root 2: * vim: set ts=8 sw=4 et tw=78: 1.1 root 3: * 4: * ***** BEGIN LICENSE BLOCK ***** 5: * Version: MPL 1.1/GPL 2.0/LGPL 2.1 6: * 7: * The contents of this file are subject to the Mozilla Public License Version 8: * 1.1 (the "License"); you may not use this file except in compliance with 9: * the License. You may obtain a copy of the License at 10: * http://www.mozilla.org/MPL/ 11: * 12: * Software distributed under the License is distributed on an "AS IS" basis, 13: * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 14: * for the specific language governing rights and limitations under the 15: * License. 16: * 17: * The Original Code is Mozilla Communicator client code, released 18: * March 31, 1998. 19: * 20: * The Initial Developer of the Original Code is 21: * Netscape Communications Corporation. 22: * Portions created by the Initial Developer are Copyright (C) 1998 23: * the Initial Developer. All Rights Reserved. 24: * 25: * Contributor(s): 26: * 27: * Alternatively, the contents of this file may be used under the terms of 28: * either of the GNU General Public License Version 2 or later (the "GPL"), 29: * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), 30: * in which case the provisions of the GPL or the LGPL are applicable instead 31: * of those above. If you wish to allow use of your version of this file only 32: * under the terms of either the GPL or the LGPL, and not to allow others to 33: * use your version of this file under the terms of the MPL, indicate your 34: * decision by deleting the provisions above and replace them with the notice 35: * and other provisions required by the GPL or the LGPL. If you do not delete 36: * the provisions above, a recipient may use your version of this file under 37: * the terms of any one of the MPL, the GPL or the LGPL. 38: * 39: * ***** END LICENSE BLOCK ***** */ 40: 41: #ifndef jsscript_h___ 42: #define jsscript_h___ 43: /* 44: * JS script descriptor. 45: */ 46: #include "jsatom.h" 47: #include "jsprvtd.h" 48: 49: JS_BEGIN_EXTERN_C 50: 51: /* 52: * Exception handling runtime information. 53: * 1.1.1.2 ! root 54: * All fields except length are code offsets relative to the main entry point ! 55: * of the script. If script->trynotes is not null, it points to a vector of 1.1 root 56: * these structs terminated by one with catchStart == 0. 57: */ 58: struct JSTryNote { 59: ptrdiff_t start; /* start of try statement */ 60: ptrdiff_t length; /* count of try statement bytecodes */ 61: ptrdiff_t catchStart; /* start of catch block (0 if end) */ 62: }; 63: 64: #define JSTRYNOTE_GRAIN sizeof(ptrdiff_t) 65: #define JSTRYNOTE_ALIGNMASK (JSTRYNOTE_GRAIN - 1) 66: 67: struct JSScript { 68: jsbytecode *code; /* bytecodes and their immediate operands */ 69: uint32 length; /* length of code vector */ 70: jsbytecode *main; /* main entry point, after predef'ing prolog */ 71: uint16 version; /* JS version under which script was compiled */ 72: uint16 numGlobalVars; /* declared global var/const/function count */ 73: JSAtomMap atomMap; /* maps immediate index to literal struct */ 74: const char *filename; /* source filename or null */ 75: uintN lineno; /* base line number of script */ 76: uintN depth; /* maximum stack depth in slots */ 77: JSTryNote *trynotes; /* exception table for this script */ 78: JSPrincipals *principals; /* principals for this script */ 79: JSObject *object; /* optional Script-class object wrapper */ 80: }; 81: 82: /* No need to store script->notes now that it is allocated right after code. */ 83: #define SCRIPT_NOTES(script) ((jssrcnote*)((script)->code+(script)->length)) 84: 85: #define SCRIPT_FIND_CATCH_START(script, pc, catchpc) \ 86: JS_BEGIN_MACRO \ 87: JSTryNote *tn_ = (script)->trynotes; \ 88: jsbytecode *catchpc_ = NULL; \ 89: if (tn_) { \ 90: ptrdiff_t off_ = PTRDIFF(pc, (script)->main, jsbytecode); \ 91: if (off_ >= 0) { \ 92: while ((jsuword)(off_ - tn_->start) >= (jsuword)tn_->length) \ 93: ++tn_; \ 94: if (tn_->catchStart) \ 95: catchpc_ = (script)->main + tn_->catchStart; \ 96: } \ 97: } \ 98: catchpc = catchpc_; \ 99: JS_END_MACRO 100: 1.1.1.2 ! root 101: /* ! 102: * Find the innermost finally block that handles the given pc. This is a ! 103: * version of SCRIPT_FIND_CATCH_START that ignore catch blocks and is used ! 104: * to implement generator.close(). ! 105: */ ! 106: jsbytecode * ! 107: js_FindFinallyHandler(JSScript *script, jsbytecode *pc); ! 108: 1.1 root 109: extern JS_FRIEND_DATA(JSClass) js_ScriptClass; 110: 111: extern JSObject * 112: js_InitScriptClass(JSContext *cx, JSObject *obj); 113: 1.1.1.2 ! root 114: /* ! 115: * On first new context in rt, initialize script runtime state, specifically ! 116: * the script filename table and its lock. ! 117: */ 1.1 root 118: extern JSBool 1.1.1.2 ! root 119: js_InitRuntimeScriptState(JSRuntime *rt); ! 120: ! 121: /* ! 122: * On last context destroy for rt, if script filenames are all GC'd, free the ! 123: * script filename table and its lock. ! 124: */ ! 125: extern void ! 126: js_FinishRuntimeScriptState(JSRuntime *rt); 1.1 root 127: 1.1.1.2 ! root 128: /* ! 129: * On JS_DestroyRuntime(rt), forcibly free script filename prefixes and any ! 130: * script filename table entries that have not been GC'd, the latter using ! 131: * js_FinishRuntimeScriptState. ! 132: * ! 133: * This allows script filename prefixes to outlive any context in rt. ! 134: */ 1.1 root 135: extern void 1.1.1.2 ! root 136: js_FreeRuntimeScriptState(JSRuntime *rt); 1.1 root 137: 138: extern const char * 139: js_SaveScriptFilename(JSContext *cx, const char *filename); 140: 1.1.1.2 ! root 141: extern const char * ! 142: js_SaveScriptFilenameRT(JSRuntime *rt, const char *filename, uint32 flags); ! 143: ! 144: extern uint32 ! 145: js_GetScriptFilenameFlags(const char *filename); ! 146: 1.1 root 147: extern void 148: js_MarkScriptFilename(const char *filename); 149: 150: extern void 1.1.1.2 ! root 151: js_MarkScriptFilenames(JSRuntime *rt, JSBool keepAtoms); ! 152: ! 153: extern void 1.1 root 154: js_SweepScriptFilenames(JSRuntime *rt); 155: 156: /* 157: * Two successively less primitive ways to make a new JSScript. The first 158: * does *not* call a non-null cx->runtime->newScriptHook -- only the second, 159: * js_NewScriptFromCG, calls this optional debugger hook. 160: * 161: * The js_NewScript function can't know whether the script it creates belongs 162: * to a function, or is top-level or eval code, but the debugger wants access 163: * to the newly made script's function, if any -- so callers of js_NewScript 164: * are responsible for notifying the debugger after successfully creating any 165: * kind (function or other) of new JSScript. 166: */ 167: extern JSScript * 168: js_NewScript(JSContext *cx, uint32 length, uint32 snlength, uint32 tnlength); 169: 170: extern JS_FRIEND_API(JSScript *) 171: js_NewScriptFromCG(JSContext *cx, JSCodeGenerator *cg, JSFunction *fun); 172: 173: /* 174: * New-script-hook calling is factored from js_NewScriptFromCG so that it 175: * and callers of js_XDRScript can share this code. In the case of callers 176: * of js_XDRScript, the hook should be invoked only after successful decode 177: * of any owning function (the fun parameter) or script object (null fun). 178: */ 179: extern JS_FRIEND_API(void) 180: js_CallNewScriptHook(JSContext *cx, JSScript *script, JSFunction *fun); 181: 1.1.1.2 ! root 182: extern JS_FRIEND_API(void) ! 183: js_CallDestroyScriptHook(JSContext *cx, JSScript *script); ! 184: 1.1 root 185: extern void 186: js_DestroyScript(JSContext *cx, JSScript *script); 187: 188: extern void 1.1.1.2 ! root 189: js_MarkScript(JSContext *cx, JSScript *script); ! 190: ! 191: /* ! 192: * To perturb as little code as possible, we introduce a js_GetSrcNote lookup ! 193: * cache without adding an explicit cx parameter. Thus js_GetSrcNote becomes ! 194: * a macro that uses cx from its calls' lexical environments. ! 195: */ ! 196: #define js_GetSrcNote(script,pc) js_GetSrcNoteCached(cx, script, pc) 1.1 root 197: 198: extern jssrcnote * 1.1.1.2 ! root 199: js_GetSrcNoteCached(JSContext *cx, JSScript *script, jsbytecode *pc); 1.1 root 200: 201: /* XXX need cx to lock function objects declared by prolog bytecodes. */ 202: extern uintN 203: js_PCToLineNumber(JSContext *cx, JSScript *script, jsbytecode *pc); 204: 205: extern jsbytecode * 206: js_LineNumberToPC(JSScript *script, uintN lineno); 207: 1.1.1.2 ! root 208: extern JS_FRIEND_API(uintN) 1.1 root 209: js_GetScriptLineExtent(JSScript *script); 210: 211: /* 212: * If magic is non-null, js_XDRScript succeeds on magic number mismatch but 213: * returns false in *magic; it reflects a match via a true *magic out param. 214: * If magic is null, js_XDRScript returns false on bad magic number errors, 215: * which it reports. 216: * 217: * NB: callers must call js_CallNewScriptHook after successful JSXDR_DECODE 218: * and subsequent set-up of owning function or script object, if any. 219: */ 220: extern JSBool 221: js_XDRScript(JSXDRState *xdr, JSScript **scriptp, JSBool *magic); 222: 223: JS_END_EXTERN_C 224: 225: #endif /* jsscript_h___ */
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