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Diffstat (limited to 'third_party/js-1.7/jsscript.h')
| -rw-r--r-- | third_party/js-1.7/jsscript.h | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/third_party/js-1.7/jsscript.h b/third_party/js-1.7/jsscript.h new file mode 100644 index 0000000..18ad373 --- /dev/null +++ b/third_party/js-1.7/jsscript.h @@ -0,0 +1,225 @@ +/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- + * vim: set ts=8 sw=4 et tw=78: + * + * ***** 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 jsscript_h___ +#define jsscript_h___ +/* + * JS script descriptor. + */ +#include "jsatom.h" +#include "jsprvtd.h" + +JS_BEGIN_EXTERN_C + +/* + * Exception handling runtime information. + * + * All fields except length are code offsets relative to the main entry point + * of the script. If script->trynotes is not null, it points to a vector of + * these structs terminated by one with catchStart == 0. + */ +struct JSTryNote { + ptrdiff_t start; /* start of try statement */ + ptrdiff_t length; /* count of try statement bytecodes */ + ptrdiff_t catchStart; /* start of catch block (0 if end) */ +}; + +#define JSTRYNOTE_GRAIN sizeof(ptrdiff_t) +#define JSTRYNOTE_ALIGNMASK (JSTRYNOTE_GRAIN - 1) + +struct JSScript { + jsbytecode *code; /* bytecodes and their immediate operands */ + uint32 length; /* length of code vector */ + jsbytecode *main; /* main entry point, after predef'ing prolog */ + uint16 version; /* JS version under which script was compiled */ + uint16 numGlobalVars; /* declared global var/const/function count */ + JSAtomMap atomMap; /* maps immediate index to literal struct */ + const char *filename; /* source filename or null */ + uintN lineno; /* base line number of script */ + uintN depth; /* maximum stack depth in slots */ + JSTryNote *trynotes; /* exception table for this script */ + JSPrincipals *principals; /* principals for this script */ + JSObject *object; /* optional Script-class object wrapper */ +}; + +/* No need to store script->notes now that it is allocated right after code. */ +#define SCRIPT_NOTES(script) ((jssrcnote*)((script)->code+(script)->length)) + +#define SCRIPT_FIND_CATCH_START(script, pc, catchpc) \ + JS_BEGIN_MACRO \ + JSTryNote *tn_ = (script)->trynotes; \ + jsbytecode *catchpc_ = NULL; \ + if (tn_) { \ + ptrdiff_t off_ = PTRDIFF(pc, (script)->main, jsbytecode); \ + if (off_ >= 0) { \ + while ((jsuword)(off_ - tn_->start) >= (jsuword)tn_->length) \ + ++tn_; \ + if (tn_->catchStart) \ + catchpc_ = (script)->main + tn_->catchStart; \ + } \ + } \ + catchpc = catchpc_; \ + JS_END_MACRO + +/* + * Find the innermost finally block that handles the given pc. This is a + * version of SCRIPT_FIND_CATCH_START that ignore catch blocks and is used + * to implement generator.close(). + */ +jsbytecode * +js_FindFinallyHandler(JSScript *script, jsbytecode *pc); + +extern JS_FRIEND_DATA(JSClass) js_ScriptClass; + +extern JSObject * +js_InitScriptClass(JSContext *cx, JSObject *obj); + +/* + * On first new context in rt, initialize script runtime state, specifically + * the script filename table and its lock. + */ +extern JSBool +js_InitRuntimeScriptState(JSRuntime *rt); + +/* + * On last context destroy for rt, if script filenames are all GC'd, free the + * script filename table and its lock. + */ +extern void +js_FinishRuntimeScriptState(JSRuntime *rt); + +/* + * On JS_DestroyRuntime(rt), forcibly free script filename prefixes and any + * script filename table entries that have not been GC'd, the latter using + * js_FinishRuntimeScriptState. + * + * This allows script filename prefixes to outlive any context in rt. + */ +extern void +js_FreeRuntimeScriptState(JSRuntime *rt); + +extern const char * +js_SaveScriptFilename(JSContext *cx, const char *filename); + +extern const char * +js_SaveScriptFilenameRT(JSRuntime *rt, const char *filename, uint32 flags); + +extern uint32 +js_GetScriptFilenameFlags(const char *filename); + +extern void +js_MarkScriptFilename(const char *filename); + +extern void +js_MarkScriptFilenames(JSRuntime *rt, JSBool keepAtoms); + +extern void +js_SweepScriptFilenames(JSRuntime *rt); + +/* + * Two successively less primitive ways to make a new JSScript. The first + * does *not* call a non-null cx->runtime->newScriptHook -- only the second, + * js_NewScriptFromCG, calls this optional debugger hook. + * + * The js_NewScript function can't know whether the script it creates belongs + * to a function, or is top-level or eval code, but the debugger wants access + * to the newly made script's function, if any -- so callers of js_NewScript + * are responsible for notifying the debugger after successfully creating any + * kind (function or other) of new JSScript. + */ +extern JSScript * +js_NewScript(JSContext *cx, uint32 length, uint32 snlength, uint32 tnlength); + +extern JS_FRIEND_API(JSScript *) +js_NewScriptFromCG(JSContext *cx, JSCodeGenerator *cg, JSFunction *fun); + +/* + * New-script-hook calling is factored from js_NewScriptFromCG so that it + * and callers of js_XDRScript can share this code. In the case of callers + * of js_XDRScript, the hook should be invoked only after successful decode + * of any owning function (the fun parameter) or script object (null fun). + */ +extern JS_FRIEND_API(void) +js_CallNewScriptHook(JSContext *cx, JSScript *script, JSFunction *fun); + +extern JS_FRIEND_API(void) +js_CallDestroyScriptHook(JSContext *cx, JSScript *script); + +extern void +js_DestroyScript(JSContext *cx, JSScript *script); + +extern void +js_MarkScript(JSContext *cx, JSScript *script); + +/* + * To perturb as little code as possible, we introduce a js_GetSrcNote lookup + * cache without adding an explicit cx parameter. Thus js_GetSrcNote becomes + * a macro that uses cx from its calls' lexical environments. + */ +#define js_GetSrcNote(script,pc) js_GetSrcNoteCached(cx, script, pc) + +extern jssrcnote * +js_GetSrcNoteCached(JSContext *cx, JSScript *script, jsbytecode *pc); + +/* XXX need cx to lock function objects declared by prolog bytecodes. */ +extern uintN +js_PCToLineNumber(JSContext *cx, JSScript *script, jsbytecode *pc); + +extern jsbytecode * +js_LineNumberToPC(JSScript *script, uintN lineno); + +extern JS_FRIEND_API(uintN) +js_GetScriptLineExtent(JSScript *script); + +/* + * If magic is non-null, js_XDRScript succeeds on magic number mismatch but + * returns false in *magic; it reflects a match via a true *magic out param. + * If magic is null, js_XDRScript returns false on bad magic number errors, + * which it reports. + * + * NB: callers must call js_CallNewScriptHook after successful JSXDR_DECODE + * and subsequent set-up of owning function or script object, if any. + */ +extern JSBool +js_XDRScript(JSXDRState *xdr, JSScript **scriptp, JSBool *magic); + +JS_END_EXTERN_C + +#endif /* jsscript_h___ */ |