/usr/include/js/jsscript.h is in libmozjs185-dev 1.8.5-1.0.0+dfsg-4.5.
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* vim: set ts=4 sw=4 et tw=79 ft=cpp:
*
* ***** 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"
#include "jsdbgapi.h"
#include "jsclist.h"
/*
* Type of try note associated with each catch or finally block, and also with
* for-in loops.
*/
typedef enum JSTryNoteKind {
JSTRY_CATCH,
JSTRY_FINALLY,
JSTRY_ITER
} JSTryNoteKind;
namespace js {
/*
* Indicates a location in the stack that an upvar value can be retrieved from
* as a two tuple of (level, slot).
*
* Some existing client code uses the level value as a delta, or level "skip"
* quantity. We could probably document that through use of more types at some
* point in the future.
*
* Existing XDR code wants this to be backed by a 32b integer for serialization,
* so we oblige.
*
* TODO: consider giving more bits to the slot value and takings ome from the level.
*/
class UpvarCookie
{
uint32 value;
static const uint32 FREE_VALUE = 0xfffffffful;
void checkInvariants() {
JS_STATIC_ASSERT(sizeof(UpvarCookie) == sizeof(uint32));
JS_STATIC_ASSERT(UPVAR_LEVEL_LIMIT < FREE_LEVEL);
}
public:
/*
* All levels above-and-including FREE_LEVEL are reserved so that
* FREE_VALUE can be used as a special value.
*/
static const uint16 FREE_LEVEL = 0x3fff;
/*
* If a function has a higher static level than this limit, we will not
* optimize it using UPVAR opcodes.
*/
static const uint16 UPVAR_LEVEL_LIMIT = 16;
static const uint16 CALLEE_SLOT = 0xffff;
static bool isLevelReserved(uint16 level) { return level >= FREE_LEVEL; }
bool isFree() const { return value == FREE_VALUE; }
uint32 asInteger() const { return value; }
/* isFree check should be performed before using these accessors. */
uint16 level() const { JS_ASSERT(!isFree()); return uint16(value >> 16); }
uint16 slot() const { JS_ASSERT(!isFree()); return uint16(value); }
void set(const UpvarCookie &other) { set(other.level(), other.slot()); }
void set(uint16 newLevel, uint16 newSlot) { value = (uint32(newLevel) << 16) | newSlot; }
void makeFree() { set(0xffff, 0xffff); JS_ASSERT(isFree()); }
void fromInteger(uint32 u32) { value = u32; }
};
}
/*
* Exception handling record.
*/
struct JSTryNote {
uint8 kind; /* one of JSTryNoteKind */
uint8 padding; /* explicit padding on uint16 boundary */
uint16 stackDepth; /* stack depth upon exception handler entry */
uint32 start; /* start of the try statement or for-in loop
relative to script->main */
uint32 length; /* length of the try statement or for-in loop */
};
typedef struct JSTryNoteArray {
JSTryNote *vector; /* array of indexed try notes */
uint32 length; /* count of indexed try notes */
} JSTryNoteArray;
typedef struct JSObjectArray {
JSObject **vector; /* array of indexed objects */
uint32 length; /* count of indexed objects */
} JSObjectArray;
typedef struct JSUpvarArray {
js::UpvarCookie *vector; /* array of indexed upvar cookies */
uint32 length; /* count of indexed upvar cookies */
} JSUpvarArray;
typedef struct JSConstArray {
js::Value *vector; /* array of indexed constant values */
uint32 length;
} JSConstArray;
struct JSArenaPool;
namespace js {
struct GlobalSlotArray {
struct Entry {
uint32 atomIndex; /* index into atom table */
uint32 slot; /* global obj slot number */
};
Entry *vector;
uint32 length;
};
struct Shape;
enum BindingKind { NONE, ARGUMENT, VARIABLE, CONSTANT, UPVAR };
/*
* Formal parameters, local variables, and upvars are stored in a shape tree
* path encapsulated within this class. This class represents bindings for
* both function and top-level scripts (the latter is needed to track names in
* strict mode eval code, to give such code its own lexical environment).
*/
class Bindings {
js::Shape *lastBinding;
uint16 nargs;
uint16 nvars;
uint16 nupvars;
public:
inline Bindings(JSContext *cx);
/*
* Transfers ownership of bindings data from bindings into this fresh
* Bindings instance. Once such a transfer occurs, the old bindings must
* not be used again.
*/
inline void transfer(JSContext *cx, Bindings *bindings);
/*
* Clones bindings data from bindings, which must be immutable, into this
* fresh Bindings instance. A Bindings instance may be cloned multiple
* times.
*/
inline void clone(JSContext *cx, Bindings *bindings);
uint16 countArgs() const { return nargs; }
uint16 countVars() const { return nvars; }
uint16 countUpvars() const { return nupvars; }
uintN countArgsAndVars() const { return nargs + nvars; }
uintN countLocalNames() const { return nargs + nvars + nupvars; }
bool hasUpvars() const { return nupvars > 0; }
bool hasLocalNames() const { return countLocalNames() > 0; }
/* Returns the shape lineage generated for these bindings. */
inline const js::Shape *lastShape() const;
enum {
/*
* A script may have no more than this many arguments, variables, or
* upvars.
*/
BINDING_COUNT_LIMIT = 0xFFFF
};
/*
* Add a local binding for the given name, of the given type, for the code
* being compiled. If fun is non-null, this binding set is being created
* for that function, so adjust corresponding metadata in that function
* while adding. Otherwise this set must correspond to a top-level script.
*
* A binding may be added twice with different kinds; the last one for a
* given name prevails. (We preserve both bindings for the decompiler,
* which must deal with such cases.) Pass null for name when indicating a
* destructuring argument. Return true on success.
*
* The parser builds shape paths for functions, usable by Call objects at
* runtime, by calling an "add" method. All ARGUMENT bindings must be added
* before before any VARIABLE or CONSTANT bindings, which themselves must
* be added before all UPVAR bindings.
*/
bool add(JSContext *cx, JSAtom *name, BindingKind kind);
/* Convenience specializations. */
bool addVariable(JSContext *cx, JSAtom *name) {
return add(cx, name, VARIABLE);
}
bool addConstant(JSContext *cx, JSAtom *name) {
return add(cx, name, CONSTANT);
}
bool addUpvar(JSContext *cx, JSAtom *name) {
return add(cx, name, UPVAR);
}
bool addArgument(JSContext *cx, JSAtom *name, uint16 *slotp) {
JS_ASSERT(name != NULL); /* not destructuring */
*slotp = nargs;
return add(cx, name, ARGUMENT);
}
bool addDestructuring(JSContext *cx, uint16 *slotp) {
*slotp = nargs;
return add(cx, NULL, ARGUMENT);
}
/*
* Look up an argument or variable name, returning its kind when found or
* NONE when no such name exists. When indexp is not null and the name
* exists, *indexp will receive the index of the corresponding argument or
* variable.
*/
BindingKind lookup(JSContext *cx, JSAtom *name, uintN *indexp) const;
/* Convenience method to check for any binding for a name. */
bool hasBinding(JSContext *cx, JSAtom *name) const {
return lookup(cx, name, NULL) != NONE;
}
/*
* Function and macros to work with local names as an array of words.
* getLocalNameArray returns the array, or null if we are out of memory.
* This function must be called only when hasLocalNames().
*
* The supplied pool is used to allocate the returned array, so the caller
* is obligated to mark and release to free it.
*
* The elements of the array with index less than nargs correspond to the
* the names of arguments. An index >= nargs addresses a var binding. Use
* JS_LOCAL_NAME_TO_ATOM to convert array's element to an atom pointer.
* This pointer can be null when the element is for an argument
* corresponding to a destructuring pattern.
*
* If nameWord does not name an argument, use JS_LOCAL_NAME_IS_CONST to
* check if nameWord corresponds to the const declaration.
*/
jsuword *
getLocalNameArray(JSContext *cx, JSArenaPool *pool);
/*
* Returns the slot where the sharp array is stored, or a value < 0 if no
* sharps are present or in case of failure.
*/
int sharpSlotBase(JSContext *cx);
/*
* Protect stored bindings from mutation. Subsequent attempts to add
* bindings will copy the existing bindings before adding to them, allowing
* the original bindings to be safely shared.
*/
void makeImmutable();
/*
* These methods provide direct access to the shape path normally
* encapsulated by js::Bindings. These methods may be used to make a
* Shape::Range for iterating over the relevant shapes from youngest to
* oldest (i.e., last or right-most to first or left-most in source order).
*
* Sometimes iteration order must be from oldest to youngest, however. For
* such cases, use js::Bindings::getLocalNameArray. The RAII class
* js::AutoLocalNameArray, defined in jscntxt.h, should be used where
* possible instead of direct calls to getLocalNameArray.
*/
const js::Shape *lastArgument() const;
const js::Shape *lastVariable() const;
const js::Shape *lastUpvar() const;
void trace(JSTracer *trc);
};
} /* namespace js */
#define JS_OBJECT_ARRAY_SIZE(length) \
(offsetof(JSObjectArray, vector) + sizeof(JSObject *) * (length))
#if defined DEBUG && defined JS_THREADSAFE
# define CHECK_SCRIPT_OWNER 1
#endif
#ifdef JS_METHODJIT
namespace JSC {
class ExecutablePool;
}
#define JS_UNJITTABLE_SCRIPT (reinterpret_cast<void*>(1))
enum JITScriptStatus {
JITScript_None,
JITScript_Invalid,
JITScript_Valid
};
namespace js {
namespace mjit {
struct JITScript;
}
}
#endif
struct JSScript {
/*
* Two successively less primitive ways to make a new JSScript. The first
* does *not* call a non-null cx->runtime->newScriptHook -- only the second,
* NewScriptFromCG, calls this optional debugger hook.
*
* The 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 NewScript
* are responsible for notifying the debugger after successfully creating any
* kind (function or other) of new JSScript.
*/
static JSScript *NewScript(JSContext *cx, uint32 length, uint32 nsrcnotes, uint32 natoms,
uint32 nobjects, uint32 nupvars, uint32 nregexps,
uint32 ntrynotes, uint32 nconsts, uint32 nglobals,
uint16 nClosedArgs, uint16 nClosedVars, JSVersion version);
static JSScript *NewScriptFromCG(JSContext *cx, JSCodeGenerator *cg);
/* FIXME: bug 586181 */
JSCList links; /* Links for compartment script list */
jsbytecode *code; /* bytecodes and their immediate operands */
uint32 length; /* length of code vector */
private:
uint16 version; /* JS version under which script was compiled */
size_t callCount_; /* Number of times the script has been called. */
public:
uint16 nfixed; /* number of slots besides stack operands in
slot array */
/*
* Offsets to various array structures from the end of this script, or
* JSScript::INVALID_OFFSET if the array has length 0.
*/
uint8 objectsOffset; /* offset to the array of nested function,
block, scope, xml and one-time regexps
objects */
uint8 upvarsOffset; /* offset of the array of display ("up")
closure vars */
uint8 regexpsOffset; /* offset to the array of to-be-cloned
regexps */
uint8 trynotesOffset; /* offset to the array of try notes */
uint8 globalsOffset; /* offset to the array of global slots */
uint8 constOffset; /* offset to the array of constants */
bool noScriptRval:1; /* no need for result value of last
expression statement */
bool savedCallerFun:1; /* object 0 is caller function */
bool hasSharps:1; /* script uses sharp variables */
bool strictModeCode:1; /* code is in strict mode */
bool compileAndGo:1; /* script was compiled with TCF_COMPILE_N_GO */
bool usesEval:1; /* script uses eval() */
bool usesArguments:1; /* script uses arguments */
bool warnedAboutTwoArgumentEval:1; /* have warned about use of
obsolete eval(s, o) in
this script */
bool hasSingletons:1; /* script has singleton objects */
#ifdef JS_METHODJIT
bool debugMode:1; /* script was compiled in debug mode */
bool singleStepMode:1; /* compile script in single-step mode */
#endif
jsbytecode *main; /* main entry point, after predef'ing prolog */
JSAtomMap atomMap; /* maps immediate index to literal struct */
JSCompartment *compartment; /* compartment the script was compiled for */
const char *filename; /* source filename or null */
uint32 lineno; /* base line number of script */
uint16 nslots; /* vars plus maximum stack depth */
uint16 staticLevel;/* static level for display maintenance */
uint16 nClosedArgs; /* number of args which are closed over. */
uint16 nClosedVars; /* number of vars which are closed over. */
js::Bindings bindings; /* names of top-level variables in this script
(and arguments if this is a function script) */
JSPrincipals *principals;/* principals for this script */
union {
/*
* A script object of class js_ScriptClass, to ensure the script is GC'd.
* - All scripts returned by JSAPI functions (JS_CompileScript,
* JS_CompileFile, etc.) have these objects.
* - Function scripts never have script objects; such scripts are owned
* by their function objects.
* - Temporary scripts created by obj_eval, JS_EvaluateScript, and
* similar functions never have these objects; such scripts are
* explicitly destroyed by the code that created them.
* Debugging API functions (JSDebugHooks::newScriptHook;
* JS_GetFunctionScript) may reveal sans-script-object Function and
* temporary scripts to clients, but clients must never call
* JS_NewScriptObject on such scripts: doing so would double-free them,
* once from the explicit call to js_DestroyScript, and once when the
* script object is garbage collected.
*/
JSObject *object;
JSScript *nextToGC; /* next to GC in rt->scriptsToGC list */
} u;
#ifdef CHECK_SCRIPT_OWNER
JSThread *owner; /* for thread-safe life-cycle assertions */
#endif
uint32 *closedSlots; /* vector of closed slots; args first, then vars. */
public:
#ifdef JS_METHODJIT
// Fast-cached pointers to make calls faster. These are also used to
// quickly test whether there is JIT code; a NULL value means no
// compilation has been attempted. A JS_UNJITTABLE_SCRIPT value means
// compilation failed. Any value is the arity-check entry point.
void *jitArityCheckNormal;
void *jitArityCheckCtor;
js::mjit::JITScript *jitNormal; /* Extra JIT info for normal scripts */
js::mjit::JITScript *jitCtor; /* Extra JIT info for constructors */
bool hasJITCode() {
return jitNormal || jitCtor;
}
// These methods are implemented in MethodJIT.h.
inline void **nativeMap(bool constructing);
inline void *maybeNativeCodeForPC(bool constructing, jsbytecode *pc);
inline void *nativeCodeForPC(bool constructing, jsbytecode *pc);
js::mjit::JITScript *getJIT(bool constructing) {
return constructing ? jitCtor : jitNormal;
}
size_t callCount() const { return callCount_; }
size_t incCallCount() { return ++callCount_; }
JITScriptStatus getJITStatus(bool constructing) {
void *addr = constructing ? jitArityCheckCtor : jitArityCheckNormal;
if (addr == NULL)
return JITScript_None;
if (addr == JS_UNJITTABLE_SCRIPT)
return JITScript_Invalid;
return JITScript_Valid;
}
#endif
/* Script notes are allocated right after the code. */
jssrcnote *notes() { return (jssrcnote *)(code + length); }
static const uint8 INVALID_OFFSET = 0xFF;
static bool isValidOffset(uint8 offset) { return offset != INVALID_OFFSET; }
JSObjectArray *objects() {
JS_ASSERT(isValidOffset(objectsOffset));
return (JSObjectArray *)((uint8 *) (this + 1) + objectsOffset);
}
JSUpvarArray *upvars() {
JS_ASSERT(isValidOffset(upvarsOffset));
return (JSUpvarArray *) ((uint8 *) (this + 1) + upvarsOffset);
}
JSObjectArray *regexps() {
JS_ASSERT(isValidOffset(regexpsOffset));
return (JSObjectArray *) ((uint8 *) (this + 1) + regexpsOffset);
}
JSTryNoteArray *trynotes() {
JS_ASSERT(isValidOffset(trynotesOffset));
return (JSTryNoteArray *) ((uint8 *) (this + 1) + trynotesOffset);
}
js::GlobalSlotArray *globals() {
JS_ASSERT(isValidOffset(globalsOffset));
return (js::GlobalSlotArray *) ((uint8 *) (this + 1) + globalsOffset);
}
JSConstArray *consts() {
JS_ASSERT(isValidOffset(constOffset));
return (JSConstArray *) ((uint8 *) (this + 1) + constOffset);
}
JSAtom *getAtom(size_t index) {
JS_ASSERT(index < atomMap.length);
return atomMap.vector[index];
}
JSObject *getObject(size_t index) {
JSObjectArray *arr = objects();
JS_ASSERT(index < arr->length);
return arr->vector[index];
}
uint32 getGlobalSlot(size_t index) {
js::GlobalSlotArray *arr = globals();
JS_ASSERT(index < arr->length);
return arr->vector[index].slot;
}
JSAtom *getGlobalAtom(size_t index) {
js::GlobalSlotArray *arr = globals();
JS_ASSERT(index < arr->length);
return getAtom(arr->vector[index].atomIndex);
}
JSVersion getVersion() const {
return JSVersion(version);
}
inline JSFunction *getFunction(size_t index);
inline JSObject *getRegExp(size_t index);
const js::Value &getConst(size_t index) {
JSConstArray *arr = consts();
JS_ASSERT(index < arr->length);
return arr->vector[index];
}
/*
* The isEmpty method tells whether this script has code that computes any
* result (not return value, result AKA normal completion value) other than
* JSVAL_VOID, or any other effects.
*/
inline bool isEmpty() const;
uint32 getClosedArg(uint32 index) {
JS_ASSERT(index < nClosedArgs);
return closedSlots[index];
}
uint32 getClosedVar(uint32 index) {
JS_ASSERT(index < nClosedVars);
return closedSlots[nClosedArgs + index];
}
void copyClosedSlotsTo(JSScript *other);
};
#define SHARP_NSLOTS 2 /* [#array, #depth] slots if the script
uses sharp variables */
static JS_INLINE uintN
StackDepth(JSScript *script)
{
return script->nslots - script->nfixed;
}
/*
* If pc_ does not point within script_'s bytecode, then it must point into an
* imacro body, so we use cx->runtime common atoms instead of script_'s atoms.
* This macro uses cx from its callers' environments in the pc-in-imacro case.
*/
#define JS_GET_SCRIPT_ATOM(script_, pc_, index, atom) \
JS_BEGIN_MACRO \
if ((pc_) < (script_)->code || \
(script_)->code + (script_)->length <= (pc_)) { \
JS_ASSERT((size_t)(index) < js_common_atom_count); \
(atom) = COMMON_ATOMS_START(&cx->runtime->atomState)[index]; \
} else { \
(atom) = script_->getAtom(index); \
} \
JS_END_MACRO
extern JS_FRIEND_DATA(js::Class) 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 JS_DestroyRuntime(rt), forcibly free script filename prefixes and any
* script filename table entries that have not been GC'd.
*
* 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);
extern void
js_SweepScriptFilenames(JSRuntime *rt);
/*
* 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 void
js_CallDestroyScriptHook(JSContext *cx, JSScript *script);
/*
* The function must be used only outside the GC for a script that was run
* only on the current thread.
*/
extern void
js_DestroyScript(JSContext *cx, JSScript *script);
extern void
js_DestroyScriptFromGC(JSContext *cx, JSScript *script);
/*
* Script objects may be cached and reused, in which case their JSD-visible
* lifetimes may be shorter than their actual lifetimes. Destroy one such
* script for real as part of a GC pass. From JSD's point of view, the script
* is already dead.
*/
extern void
js_DestroyCachedScript(JSContext *cx, JSScript *script);
extern void
js_TraceScript(JSTracer *trc, JSScript *script);
extern JSObject *
js_NewScriptObject(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);
/*
* NOTE: use js_FramePCToLineNumber(cx, fp) when you have an active fp, in
* preference to js_PCToLineNumber (cx, fp->script fp->regs->pc), because
* fp->imacpc may be non-null, indicating an active imacro.
*/
extern uintN
js_FramePCToLineNumber(JSContext *cx, JSStackFrame *fp);
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);
static JS_INLINE JSOp
js_GetOpcode(JSContext *cx, JSScript *script, jsbytecode *pc)
{
JSOp op = (JSOp) *pc;
if (op == JSOP_TRAP)
op = JS_GetTrapOpcode(cx, script, pc);
return op;
}
extern JSScript *
js_CloneScript(JSContext *cx, 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: after a successful JSXDR_DECODE, js_XDRScript callers must do any
* required subsequent set-up of owning function or script object and then call
* js_CallNewScriptHook.
*/
extern JSBool
js_XDRScript(JSXDRState *xdr, JSScript **scriptp, JSBool *hasMagic);
inline bool
JSObject::isScript() const
{
return getClass() == &js_ScriptClass;
}
inline JSScript *
JSObject::getScript() const
{
JS_ASSERT(isScript());
return static_cast<JSScript *>(getPrivate());
}
#endif /* jsscript_h___ */
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