DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Untracked file

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209
/* -*- 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 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

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, uintN gcflags);

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, void *arg);

extern jssrcnote *
js_GetSrcNote(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___ */