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Tip revision: 39ff442a68b35e2412bd3f81a1fe0046dbad56a1 authored by ffxbld on 04 April 2012, 03:40:54 UTC
Added FENNEC_12_0b4_RELEASE FENNEC_12_0b4_BUILD1 tag(s) for changeset a8e7d1956aa3. DONTBUILD CLOSED TREE a=release
Added FENNEC_12_0b4_RELEASE FENNEC_12_0b4_BUILD1 tag(s) for changeset a8e7d1956aa3. DONTBUILD CLOSED TREE a=release
Tip revision: 39ff442
jsscript.h
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* 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"
#include "jsinfer.h"
#include "jsscope.h"
#include "gc/Barrier.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_t value;
static const uint32_t FREE_VALUE = 0xfffffffful;
void checkInvariants() {
JS_STATIC_ASSERT(sizeof(UpvarCookie) == sizeof(uint32_t));
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_t 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_t UPVAR_LEVEL_LIMIT = 16;
static const uint16_t CALLEE_SLOT = 0xffff;
static bool isLevelReserved(uint16_t level) { return level >= FREE_LEVEL; }
bool isFree() const { return value == FREE_VALUE; }
uint32_t asInteger() const { return value; }
/* isFree check should be performed before using these accessors. */
uint16_t level() const { JS_ASSERT(!isFree()); return uint16_t(value >> 16); }
uint16_t slot() const { JS_ASSERT(!isFree()); return uint16_t(value); }
void set(const UpvarCookie &other) { set(other.level(), other.slot()); }
void set(uint16_t newLevel, uint16_t newSlot) { value = (uint32_t(newLevel) << 16) | newSlot; }
void makeFree() { set(0xffff, 0xffff); JS_ASSERT(isFree()); }
void fromInteger(uint32_t u32) { value = u32; }
};
}
/*
* Exception handling record.
*/
struct JSTryNote {
uint8_t kind; /* one of JSTryNoteKind */
uint8_t padding; /* explicit padding on uint16_t boundary */
uint16_t stackDepth; /* stack depth upon exception handler entry */
uint32_t start; /* start of the try statement or for-in loop
relative to script->main */
uint32_t length; /* length of the try statement or for-in loop */
};
typedef struct JSTryNoteArray {
JSTryNote *vector; /* array of indexed try notes */
uint32_t length; /* count of indexed try notes */
} JSTryNoteArray;
typedef struct JSObjectArray {
js::HeapPtrObject *vector; /* array of indexed objects */
uint32_t length; /* count of indexed objects */
} JSObjectArray;
typedef struct JSUpvarArray {
js::UpvarCookie *vector; /* array of indexed upvar cookies */
uint32_t length; /* count of indexed upvar cookies */
} JSUpvarArray;
typedef struct JSConstArray {
js::HeapValue *vector; /* array of indexed constant values */
uint32_t length;
} JSConstArray;
namespace js {
struct GlobalSlotArray {
struct Entry {
uint32_t atomIndex; /* index into atom table */
uint32_t slot; /* global obj slot number */
};
Entry *vector;
uint32_t 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 {
HeapPtr<Shape> lastBinding;
uint16_t nargs;
uint16_t nvars;
uint16_t nupvars;
bool hasDup_:1; // true if there are duplicate argument names
inline Shape *initialShape(JSContext *cx) const;
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_t countArgs() const { return nargs; }
uint16_t countVars() const { return nvars; }
uint16_t 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; }
/* Ensure these bindings have a shape lineage. */
inline bool ensureShape(JSContext *cx);
/* Return the shape lineage generated for these bindings. */
inline Shape *lastShape() const;
/*
* Return the shape to use to create a call object for these bindings.
* The result is guaranteed not to have duplicate property names.
*/
Shape *callObjectShape(JSContext *cx) const;
/* See Scope::extensibleParents */
inline bool extensibleParents();
bool setExtensibleParents(JSContext *cx);
bool setParent(JSContext *cx, JSObject *obj);
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_t *slotp) {
JS_ASSERT(name != NULL); /* not destructuring */
*slotp = nargs;
return add(cx, name, ARGUMENT);
}
bool addDestructuring(JSContext *cx, uint16_t *slotp) {
*slotp = nargs;
return add(cx, NULL, ARGUMENT);
}
void noteDup() { hasDup_ = true; }
bool hasDup() const { return hasDup_; }
/*
* 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;
}
/*
* This method returns the local variable, argument, etc. names used by a
* script. This function must be called only when hasLocalNames().
*
* The elements of the vector with index less than nargs correspond to the
* the names of arguments. An index >= nargs addresses a var binding.
* The name at an element will be null when the element is for an argument
* corresponding to a destructuring pattern.
*/
bool getLocalNameArray(JSContext *cx, Vector<JSAtom *> *namesp);
/*
* 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.
*/
const js::Shape *lastArgument() const;
const js::Shape *lastVariable() const;
const js::Shape *lastUpvar() const;
void trace(JSTracer *trc);
/* Rooter for stack allocated Bindings. */
struct StackRoot {
RootShape root;
StackRoot(JSContext *cx, Bindings *bindings)
: root(cx, (Shape **) &bindings->lastBinding)
{}
};
};
} /* namespace js */
#define JS_OBJECT_ARRAY_SIZE(length) \
(offsetof(JSObjectArray, vector) + sizeof(JSObject *) * (length))
#ifdef JS_METHODJIT
namespace JSC {
class ExecutablePool;
}
#define JS_UNJITTABLE_SCRIPT (reinterpret_cast<void*>(1))
namespace js { namespace mjit { struct JITScript; } }
#endif
namespace js {
namespace analyze { class ScriptAnalysis; }
class ScriptOpcodeCounts
{
friend struct ::JSScript;
friend struct ScriptOpcodeCountsPair;
OpcodeCounts *counts;
public:
ScriptOpcodeCounts() : counts(NULL) {
}
inline void destroy(JSContext *cx);
void steal(ScriptOpcodeCounts &other) {
*this = other;
js::PodZero(&other);
}
// Boolean conversion, for 'if (counters) ...'
operator void*() const {
return counts;
}
};
class DebugScript
{
friend struct ::JSScript;
/*
* When non-zero, compile script in single-step mode. The top bit is set and
* cleared by setStepMode, as used by JSD. The lower bits are a count,
* adjusted by changeStepModeCount, used by the Debugger object. Only
* when the bit is clear and the count is zero may we compile the script
* without single-step support.
*/
uint32_t stepMode;
/* Number of breakpoint sites at opcodes in the script. */
uint32_t numSites;
/*
* Array with all breakpoints installed at opcodes in the script, indexed
* by the offset of the opcode into the script.
*/
BreakpointSite *breakpoints[1];
};
} /* namespace js */
static const uint32_t JS_SCRIPT_COOKIE = 0xc00cee;
struct JSScript : public js::gc::Cell {
/*
* Two successively less primitive ways to make a new JSScript. The first
* does *not* call a non-null cx->runtime->newScriptHook -- only the second,
* NewScriptFromEmitter, 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_t length, uint32_t nsrcnotes, uint32_t natoms,
uint32_t nobjects, uint32_t nupvars, uint32_t nregexps,
uint32_t ntrynotes, uint32_t nconsts, uint32_t nglobals,
uint16_t nClosedArgs, uint16_t nClosedVars, uint32_t nTypeSets,
JSVersion version);
static JSScript *NewScriptFromEmitter(JSContext *cx, js::BytecodeEmitter *bce);
#ifdef JS_CRASH_DIAGNOSTICS
/*
* Make sure that the cookie size does not affect the GC alignment
* requirements.
*/
uint32_t cookie1[Cell::CellSize / sizeof(uint32_t)];
#endif
jsbytecode *code; /* bytecodes and their immediate operands */
uint8_t *data; /* pointer to variable-length data array */
uint32_t length; /* length of code vector */
private:
uint16_t version; /* JS version under which script was compiled */
public:
uint16_t 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_t objectsOffset; /* offset to the array of nested function,
block, scope, xml and one-time regexps
objects */
uint8_t upvarsOffset; /* offset of the array of display ("up")
closure vars */
uint8_t regexpsOffset; /* offset to the array of to-be-cloned
regexps */
uint8_t trynotesOffset; /* offset to the array of try notes */
uint8_t globalsOffset; /* offset to the array of global slots */
uint8_t constOffset; /* offset to the array of constants */
uint16_t nTypeSets; /* number of type sets used in this script for
dynamic type monitoring */
uint32_t lineno; /* base line number of script */
uint32_t mainOffset; /* offset of main entry point from code, after
predef'ing prolog */
bool noScriptRval:1; /* no need for result value of last
expression statement */
bool savedCallerFun:1; /* can call getCallerFunction() */
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 warnedAboutUndefinedProp:1; /* have warned about uses of
undefined properties in this
script */
bool hasSingletons:1; /* script has singleton objects */
bool isOuterFunction:1; /* function is heavyweight, with inner functions */
bool isInnerFunction:1; /* function is directly nested in a heavyweight
* outer function */
bool isActiveEval:1; /* script came from eval(), and is still active */
bool isCachedEval:1; /* script came from eval(), and is in eval cache */
bool usedLazyArgs:1; /* script has used lazy arguments at some point */
bool createdArgs:1; /* script has had arguments objects created */
bool uninlineable:1; /* script is considered uninlineable by analysis */
bool reentrantOuterFunction:1; /* outer function marked reentrant */
bool typesPurged:1; /* TypeScript has been purged at some point */
#ifdef JS_METHODJIT
bool debugMode:1; /* script was compiled in debug mode */
bool failedBoundsCheck:1; /* script has had hoisted bounds checks fail */
#endif
bool callDestroyHook:1;/* need to call destroy hook */
uint32_t natoms; /* length of atoms array */
uint16_t nslots; /* vars plus maximum stack depth */
uint16_t staticLevel;/* static level for display maintenance */
uint16_t nClosedArgs; /* number of args which are closed over. */
uint16_t nClosedVars; /* number of vars which are closed over. */
/*
* To ensure sizeof(JSScript) % gc::Cell::CellSize == 0 on we must pad
* the script with 4 bytes. We use them to store tiny scripts like empty
* scripts.
*/
#if JS_BITS_PER_WORD == 64
#define JS_SCRIPT_INLINE_DATA_LIMIT 4
uint8_t inlineData[JS_SCRIPT_INLINE_DATA_LIMIT];
#endif
const char *filename; /* source filename or null */
JSAtom **atoms; /* maps immediate index to literal struct */
private:
size_t useCount; /* Number of times the script has been called
* or has had backedges taken. Reset if the
* script's JIT code is forcibly discarded. */
public:
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 */
JSPrincipals *originPrincipals; /* see jsapi.h 'originPrincipals' comment */
jschar *sourceMap; /* source map file or null */
/*
* A global object for the script.
* - All scripts returned by JSAPI functions (JS_CompileScript,
* JS_CompileUTF8File, etc.) have a non-null globalObject.
* - A function script has a globalObject if the function comes from a
* compile-and-go script.
* - Temporary scripts created by obj_eval, JS_EvaluateScript, and
* similar functions never have the globalObject field set; for such
* scripts the global should be extracted from the JS frame that
* execute scripts.
*/
js::HeapPtr<js::GlobalObject, JSScript*> globalObject;
/* Hash table chaining for JSCompartment::evalCache. */
JSScript *&evalHashLink() { return *globalObject.unsafeGetUnioned(); }
uint32_t *closedSlots; /* vector of closed slots; args first, then vars. */
/* Execution and profiling information for JIT code in the script. */
js::ScriptOpcodeCounts pcCounters;
private:
js::DebugScript *debug;
js::HeapPtrFunction function_;
public:
/*
* Original compiled function for the script, if it has a function.
* NULL for global and eval scripts.
*/
JSFunction *function() const { return function_; }
void setFunction(JSFunction *fun);
#ifdef JS_CRASH_DIAGNOSTICS
/* All diagnostic fields must be multiples of Cell::CellSize. */
uint32_t cookie2[Cell::CellSize / sizeof(uint32_t)];
#endif
#ifdef DEBUG
/*
* Unique identifier within the compartment for this script, used for
* printing analysis information.
*/
uint32_t id_;
uint32_t idpad;
unsigned id();
#else
unsigned id() { return 0; }
#endif
/* Persistent type information retained across GCs. */
js::types::TypeScript *types;
#if JS_BITS_PER_WORD == 32
private:
void *padding_;
public:
#endif
/* Ensure the script has a TypeScript. */
inline bool ensureHasTypes(JSContext *cx);
/*
* Ensure the script has scope and bytecode analysis information.
* Performed when the script first runs, or first runs after a TypeScript
* GC purge. If scope is NULL then the script must already have types with
* scope information.
*/
inline bool ensureRanAnalysis(JSContext *cx, JSObject *scope);
/* Ensure the script has type inference analysis information. */
inline bool ensureRanInference(JSContext *cx);
inline bool hasAnalysis();
inline void clearAnalysis();
inline js::analyze::ScriptAnalysis *analysis();
/*
* Associates this script with a specific function, constructing a new type
* object for the function if necessary.
*/
bool typeSetFunction(JSContext *cx, JSFunction *fun, bool singleton = false);
inline bool hasGlobal() const;
inline bool hasClearedGlobal() const;
inline js::GlobalObject *global() const;
inline js::types::TypeScriptNesting *nesting() const;
inline void clearNesting();
/* Return creation time global or null. */
js::GlobalObject *getGlobalObjectOrNull() const {
return isCachedEval ? NULL : globalObject.get();
}
private:
bool makeTypes(JSContext *cx);
bool makeAnalysis(JSContext *cx);
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 */
#endif
#ifdef JS_METHODJIT
bool hasJITCode() {
return jitNormal || jitCtor;
}
// These methods are implemented in MethodJIT.h.
inline void **nativeMap(bool constructing);
inline void *nativeCodeForPC(bool constructing, jsbytecode *pc);
js::mjit::JITScript *getJIT(bool constructing) {
return constructing ? jitCtor : jitNormal;
}
size_t getUseCount() const { return useCount; }
size_t incUseCount() { return ++useCount; }
size_t *addressOfUseCount() { return &useCount; }
void resetUseCount() { useCount = 0; }
/*
* Size of the JITScript and all sections. If |mallocSizeOf| is NULL, the
* size is computed analytically. (This method is implemented in
* MethodJIT.cpp.)
*/
size_t sizeOfJitScripts(JSMallocSizeOfFun mallocSizeOf);
#endif
/* Counter accessors. */
js::OpcodeCounts getCounts(jsbytecode *pc) {
JS_ASSERT(size_t(pc - code) < length);
return pcCounters.counts[pc - code];
}
bool initCounts(JSContext *cx);
void destroyCounts(JSContext *cx);
jsbytecode *main() {
return code + mainOffset;
}
/*
* computedSizeOfData() is the in-use size of all the data sections.
* sizeOfData() is the size of the block allocated to hold all the data sections
* (which can be larger than the in-use size).
*/
size_t computedSizeOfData();
size_t sizeOfData(JSMallocSizeOfFun mallocSizeOf);
uint32_t numNotes(); /* Number of srcnote slots in the srcnotes section */
/* Script notes are allocated right after the code. */
jssrcnote *notes() { return (jssrcnote *)(code + length); }
static const uint8_t INVALID_OFFSET = 0xFF;
static bool isValidOffset(uint8_t offset) { return offset != INVALID_OFFSET; }
JSObjectArray *objects() {
JS_ASSERT(isValidOffset(objectsOffset));
return reinterpret_cast<JSObjectArray *>(data + objectsOffset);
}
JSUpvarArray *upvars() {
JS_ASSERT(isValidOffset(upvarsOffset));
return reinterpret_cast<JSUpvarArray *>(data + upvarsOffset);
}
JSObjectArray *regexps() {
JS_ASSERT(isValidOffset(regexpsOffset));
return reinterpret_cast<JSObjectArray *>(data + regexpsOffset);
}
JSTryNoteArray *trynotes() {
JS_ASSERT(isValidOffset(trynotesOffset));
return reinterpret_cast<JSTryNoteArray *>(data + trynotesOffset);
}
js::GlobalSlotArray *globals() {
JS_ASSERT(isValidOffset(globalsOffset));
return reinterpret_cast<js::GlobalSlotArray *>(data + globalsOffset);
}
JSConstArray *consts() {
JS_ASSERT(isValidOffset(constOffset));
return reinterpret_cast<JSConstArray *>(data + constOffset);
}
JSAtom *getAtom(size_t index) {
JS_ASSERT(index < natoms);
return atoms[index];
}
js::PropertyName *getName(size_t index) {
return getAtom(index)->asPropertyName();
}
JSObject *getObject(size_t index) {
JSObjectArray *arr = objects();
JS_ASSERT(index < arr->length);
return arr->vector[index];
}
JSVersion getVersion() const {
return JSVersion(version);
}
inline JSFunction *getFunction(size_t index);
inline JSFunction *getCallerFunction();
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_t getClosedArg(uint32_t index) {
JS_ASSERT(index < nClosedArgs);
return closedSlots[index];
}
uint32_t getClosedVar(uint32_t index) {
JS_ASSERT(index < nClosedVars);
return closedSlots[nClosedArgs + index];
}
void copyClosedSlotsTo(JSScript *other);
private:
static const uint32_t stepFlagMask = 0x80000000U;
static const uint32_t stepCountMask = 0x7fffffffU;
/*
* Attempt to recompile with or without single-stepping support, as directed
* by stepModeEnabled().
*/
bool recompileForStepMode(JSContext *cx);
/* Attempt to change this->stepMode to |newValue|. */
bool tryNewStepMode(JSContext *cx, uint32_t newValue);
bool ensureHasDebug(JSContext *cx);
public:
bool hasBreakpointsAt(jsbytecode *pc) { return !!getBreakpointSite(pc); }
bool hasAnyBreakpointsOrStepMode() { return !!debug; }
js::BreakpointSite *getBreakpointSite(jsbytecode *pc)
{
JS_ASSERT(size_t(pc - code) < length);
return debug ? debug->breakpoints[pc - code] : NULL;
}
js::BreakpointSite *getOrCreateBreakpointSite(JSContext *cx, jsbytecode *pc,
js::GlobalObject *scriptGlobal);
void destroyBreakpointSite(JSRuntime *rt, jsbytecode *pc);
void clearBreakpointsIn(JSContext *cx, js::Debugger *dbg, JSObject *handler);
void clearTraps(JSContext *cx);
void markTrapClosures(JSTracer *trc);
/*
* Set or clear the single-step flag. If the flag is set or the count
* (adjusted by changeStepModeCount) is non-zero, then the script is in
* single-step mode. (JSD uses an on/off-style interface; Debugger uses a
* count-style interface.)
*/
bool setStepModeFlag(JSContext *cx, bool step);
/*
* Increment or decrement the single-step count. If the count is non-zero or
* the flag (set by setStepModeFlag) is set, then the script is in
* single-step mode. (JSD uses an on/off-style interface; Debugger uses a
* count-style interface.)
*/
bool changeStepModeCount(JSContext *cx, int delta);
bool stepModeEnabled() { return debug && !!debug->stepMode; }
#ifdef DEBUG
uint32_t stepModeCount() { return debug ? (debug->stepMode & stepCountMask) : 0; }
#endif
void finalize(JSContext *cx, bool background);
static inline void writeBarrierPre(JSScript *script);
static inline void writeBarrierPost(JSScript *script, void *addr);
static inline js::ThingRootKind rootKind() { return js::THING_ROOT_SCRIPT; }
};
/* If this fails, padding_ can be removed. */
JS_STATIC_ASSERT(sizeof(JSScript) % js::gc::Cell::CellSize == 0);
static JS_INLINE uintN
StackDepth(JSScript *script)
{
return script->nslots - script->nfixed;
}
extern void
js_MarkScriptFilename(const char *filename);
extern void
js_SweepScriptFilenames(JSCompartment *comp);
/*
* New-script-hook calling is factored from NewScriptFromEmitter 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);
namespace js {
struct ScriptOpcodeCountsPair
{
JSScript *script;
ScriptOpcodeCounts counters;
OpcodeCounts &getCounts(jsbytecode *pc) const {
JS_ASSERT(unsigned(pc - script->code) < script->length);
return counters.counts[pc - script->code];
}
};
#ifdef JS_CRASH_DIAGNOSTICS
void
CheckScript(JSScript *script, JSScript *prev);
#else
inline void
CheckScript(JSScript *script, JSScript *prev)
{
}
#endif /* !JS_CRASH_DIAGNOSTICS */
} /* namespace js */
/*
* 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);
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);
namespace js {
extern uintN
CurrentLine(JSContext *cx);
/*
* This function returns the file and line number of the script currently
* executing on cx. If there is no current script executing on cx (e.g., a
* native called directly through JSAPI (e.g., by setTimeout)), NULL and 0 are
* returned as the file and line. Additionally, this function avoids the full
* linear scan to compute line number when the caller guarnatees that the
* script compilation occurs at a JSOP_EVAL.
*/
enum LineOption {
CALLED_FROM_JSOP_EVAL,
NOT_CALLED_FROM_JSOP_EVAL
};
inline void
CurrentScriptFileLineOrigin(JSContext *cx, uintN *linenop, LineOption = NOT_CALLED_FROM_JSOP_EVAL);
}
extern JSScript *
js_CloneScript(JSContext *cx, JSScript *script);
/*
* 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);
#endif /* jsscript_h___ */