210 lines
8.1 KiB
C
210 lines
8.1 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code, released
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* March 31, 1998.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef jsscript_h___
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#define jsscript_h___
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/*
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* JS script descriptor.
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*/
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#include "jsatom.h"
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#include "jsprvtd.h"
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JS_BEGIN_EXTERN_C
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/*
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* Exception handling runtime information.
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*
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* All fields except length are code offsets relative to the main entry point
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* of the script. If script->trynotes is not null, it points to a vector of
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* these structs terminated by one with catchStart == 0.
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*/
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struct JSTryNote {
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ptrdiff_t start; /* start of try statement */
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ptrdiff_t length; /* count of try statement bytecodes */
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ptrdiff_t catchStart; /* start of catch block (0 if end) */
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};
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#define JSTRYNOTE_GRAIN sizeof(ptrdiff_t)
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#define JSTRYNOTE_ALIGNMASK (JSTRYNOTE_GRAIN - 1)
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struct JSScript {
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jsbytecode *code; /* bytecodes and their immediate operands */
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uint32 length; /* length of code vector */
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jsbytecode *main; /* main entry point, after predef'ing prolog */
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uint16 version; /* JS version under which script was compiled */
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uint16 numGlobalVars; /* declared global var/const/function count */
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JSAtomMap atomMap; /* maps immediate index to literal struct */
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const char *filename; /* source filename or null */
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uintN lineno; /* base line number of script */
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uintN depth; /* maximum stack depth in slots */
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JSTryNote *trynotes; /* exception table for this script */
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JSPrincipals *principals; /* principals for this script */
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JSObject *object; /* optional Script-class object wrapper */
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};
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/* No need to store script->notes now that it is allocated right after code. */
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#define SCRIPT_NOTES(script) ((jssrcnote*)((script)->code+(script)->length))
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#define SCRIPT_FIND_CATCH_START(script, pc, catchpc) \
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JS_BEGIN_MACRO \
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JSTryNote *tn_ = (script)->trynotes; \
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jsbytecode *catchpc_ = NULL; \
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if (tn_) { \
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ptrdiff_t off_ = PTRDIFF(pc, (script)->main, jsbytecode); \
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if (off_ >= 0) { \
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while ((jsuword)(off_ - tn_->start) >= (jsuword)tn_->length) \
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++tn_; \
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if (tn_->catchStart) \
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catchpc_ = (script)->main + tn_->catchStart; \
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} \
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} \
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catchpc = catchpc_; \
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JS_END_MACRO
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extern JS_FRIEND_DATA(JSClass) js_ScriptClass;
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extern JSObject *
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js_InitScriptClass(JSContext *cx, JSObject *obj);
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/*
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* On first new context in rt, initialize script runtime state, specifically
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* the script filename table and its lock.
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*/
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extern JSBool
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js_InitRuntimeScriptState(JSRuntime *rt);
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/*
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* On last context destroy for rt, if script filenames are all GC'd, free the
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* script filename table and its lock.
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*/
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extern void
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js_FinishRuntimeScriptState(JSRuntime *rt);
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/*
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* On JS_DestroyRuntime(rt), forcibly free script filename prefixes and any
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* script filename table entries that have not been GC'd, the latter using
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* js_FinishRuntimeScriptState.
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*
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* This allows script filename prefixes to outlive any context in rt.
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*/
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extern void
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js_FreeRuntimeScriptState(JSRuntime *rt);
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extern const char *
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js_SaveScriptFilename(JSContext *cx, const char *filename);
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extern const char *
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js_SaveScriptFilenameRT(JSRuntime *rt, const char *filename, uint32 flags);
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extern uint32
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js_GetScriptFilenameFlags(const char *filename);
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extern void
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js_MarkScriptFilename(const char *filename);
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extern void
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js_MarkScriptFilenames(JSRuntime *rt, uintN gcflags);
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extern void
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js_SweepScriptFilenames(JSRuntime *rt);
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/*
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* Two successively less primitive ways to make a new JSScript. The first
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* does *not* call a non-null cx->runtime->newScriptHook -- only the second,
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* js_NewScriptFromCG, calls this optional debugger hook.
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*
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* The js_NewScript function can't know whether the script it creates belongs
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* to a function, or is top-level or eval code, but the debugger wants access
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* to the newly made script's function, if any -- so callers of js_NewScript
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* are responsible for notifying the debugger after successfully creating any
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* kind (function or other) of new JSScript.
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*/
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extern JSScript *
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js_NewScript(JSContext *cx, uint32 length, uint32 snlength, uint32 tnlength);
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extern JS_FRIEND_API(JSScript *)
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js_NewScriptFromCG(JSContext *cx, JSCodeGenerator *cg, JSFunction *fun);
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/*
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* New-script-hook calling is factored from js_NewScriptFromCG so that it
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* and callers of js_XDRScript can share this code. In the case of callers
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* of js_XDRScript, the hook should be invoked only after successful decode
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* of any owning function (the fun parameter) or script object (null fun).
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*/
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extern JS_FRIEND_API(void)
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js_CallNewScriptHook(JSContext *cx, JSScript *script, JSFunction *fun);
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extern JS_FRIEND_API(void)
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js_CallDestroyScriptHook(JSContext *cx, JSScript *script);
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extern void
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js_DestroyScript(JSContext *cx, JSScript *script);
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extern void
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js_MarkScript(JSContext *cx, JSScript *script, void *arg);
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extern jssrcnote *
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js_GetSrcNote(JSScript *script, jsbytecode *pc);
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/* XXX need cx to lock function objects declared by prolog bytecodes. */
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extern uintN
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js_PCToLineNumber(JSContext *cx, JSScript *script, jsbytecode *pc);
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extern jsbytecode *
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js_LineNumberToPC(JSScript *script, uintN lineno);
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extern JS_FRIEND_API(uintN)
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js_GetScriptLineExtent(JSScript *script);
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/*
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* If magic is non-null, js_XDRScript succeeds on magic number mismatch but
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* returns false in *magic; it reflects a match via a true *magic out param.
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* If magic is null, js_XDRScript returns false on bad magic number errors,
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* which it reports.
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*
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* NB: callers must call js_CallNewScriptHook after successful JSXDR_DECODE
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* and subsequent set-up of owning function or script object, if any.
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*/
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extern JSBool
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js_XDRScript(JSXDRState *xdr, JSScript **scriptp, JSBool *magic);
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JS_END_EXTERN_C
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#endif /* jsscript_h___ */
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