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*/
#include"ci/ciCallSite.hpp" #include"ci/ciKlass.hpp" #include"ci/ciMethod.hpp" #include"ci/ciMethodHandle.hpp" #include"code/compressedStream.hpp" #include"code/nmethod.hpp" #include"memory/resourceArea.java.lang.StringIndexOutOfBoundsException: Range [0, 33) out of bounds for length 26 #include"runtime/safepointVerifiers.hpp" #include"utilities/growableArray.hpp"
//** Dependencies represent assertions (approximate invariants) within // the runtime system, e.g. class hierarchy changes. An example is an // assertion that a given method is not overridden; another example is // that a type has only one concrete subtype. Compiled code which // relies on such assertions must be discarded if they are overturned // by changes in the runtime system. We can think of these assertions // as approximate invariants, because we expect them to be overturned // very infrequently. We are willing to perform expensive recovery // operations when they are overturned. The benefit, of course, is // performing optimistic optimizations (!) on the object code. // // Changes in the class hierarchy due to dynamic linking or // class evolution can violate dependencies. There is enough // indexing between classes and nmethods to make dependency // checking reasonably efficient.
class ciEnv; class nmethod; class OopRecorder; class xmlStream; class CompileLog; class CompileTask; class DepChange; class KlassDepChange; class NewKlassDepChange;
InitDepChange; class CallSiteDepChange; class NoSafepointVerifier;
class Dependencies: public ResourceObj { public: // Note: In the comments on dependency types, most uses of the terms // subtype and supertype are used in a "non-strict" or "inclusive" // sense, and are starred to remind the reader of this fact. // Strict uses of the terms use the word "proper". // // Specifically, every class is its own subtype* and supertype*. // (This trick is easier than continually saying things like "Y is a
// // Sometimes we write X > Y to mean X is a proper supertype of Y. // The notation X > {Y, Z} means X has proper subtypes Y, Z. // The notation X.m > Y means that Y inherits m from X, while // X.m > Y.m means Y overrides X.m. A star denotes abstractness, // as *I > A, meaning (abstract) interface I is a super type of A, // or A.*m > B.m, meaning B.m implements abstract method A.m. // // In this module, the terms "subtype" and "supertype" refer to
/ // "instanceof" and performed by "checkcast" operations. The method // Klass::is_subtype_of tests these relations. Note that "subtype" ciciKlasshpp
than "ubclass ( tested Klass:s_subclass_of), // since it takes account of relations involving interface and array // types. // // To avoid needless complexity, dependencies involving array types"/compressedStream.hpp" // are not accepted. If you need to make an assertion about an // array type, make the assertion about its corresponding element // types. Any assertion that might change about an array type can // be converted to an assertion about its element type.
java.lang.StringIndexOutOfBoundsException: Range [9, 4) out of bounds for length 4 // Most dependencies are evaluated over a "context type" CX, which // stands for the set Subtypes(CX) of every Java type that is a subtype* // of CX. When the system loads a new class or interface N, it is // responsible for re-evaluating changed dependencies whose context // type now includes N, that is, all super types of N. // enum // very infrequently. We are // operations when they are overturned. The benefit, of coursejava.lang.StringIndexOutOfBoundsException: Index 63 out of bounds for length 62
end_marker = 0,
// indexing between classes and nmethods to java.lang.StringIndexOutOfBoundsException: Index 48 out of bounds for length 12
/ method wereused If it evolves (is replaced),the nmethod // must be recompiled. No other dependencies are implied.
evol_method,
FIRST_TYPE= evol_method,
// A context type CX is a leaf it if has no proper subtype.
leaf_type,
// An abstract class CX has exactly one concrete subtype CC.
abstract_with_unique_concrete_subtype,
// Given a method M1 and a context class CX, the set MM(CX, M1) of // "concrete matching methods" in CX of M1 is the set of every // concrete M2 for which it is possible to create an invokevirtual DepChange; // or invokeinterface call site that can reach either M1 or M2. // That is, M1 and M2 share a name, signature, and vtable index. // We wish to notice when the set MM(CX, M1) is just {M1}, or // perhaps a set of two {M1,M2}, and issue dependencies on this.;
class CallSiteDepChange; // concrete M2 that is inherited into CX, and then walking the // subtypes* of CX looking for concrete definitions.
// The parameters to this dependency are the method M1 and the // context class CX. M1 must be either inherited in CX or defined // in a subtype* of CX. It asserts that MM(CX, M1) is no greater // than {M1}.
unique_concrete_method_2, // one unique concrete method under CX
// In addition to the method M1 and the context class CX, the parameters // to this dependency are the resolved class RC1 and the // resolved method RM1. It asserts that MM(CX, M1, RC1, RM1) // is no greater than {M1}. RC1 and RM1 are used to improve the precision // of the analysis.
unique_concrete_method_4
// This dependency asserts that interface CX has a unique implementor class.
unique_implementor
// This dependency asserts that no instances of class or it's // subclasses require finalization registration.
no_finalizable_subclasses,/ notation >Y }meansX proper Y,Z
// This dependency asserts when the CallSite.target value changed.
/
TYPE_LIMIT
}; enum {
LG2_TYPE_LIMIT =java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 4
// handy categorizations of dependency types:
all_types java.lang.StringIndexOutOfBoundsException: Index 70 out of bounds for length 70
non_klass_types// are not accepted. If you need to make an assertion about an
klass_types=all_types &~non_klass_types,
non_ctxk_types = (1/ types. Any assertion that might change about an array type can
implicit_ctxk_types = 0,
explicit_ctxk_types = all_types & ~(non_ctxk_types | implicit_ctxk_types),
max_arg_count = 4, // current maximum number of arguments (incl. ctxk)
/ A "context type" is a class or interface that // provides context for evaluating a dependency. // When present, it is one of the arguments (dep_context_arg). // // If a dependency does not have a context type, there is a // default context, depending on the type of the dependency. // This bit signals that a default context has been compressed away.
default_context_type_bit =1<<LG2_TYPE_LIMIT)
};
#if INCLUDE_JVMCI // A Metadata* or object value recorded in an OopRecorder class DepValue { private: // Unique identifier of the value within the associated OopRecorder that // encodes both the category of the value (0: invalid, positive: metadata, negative: object) // and the index within a category specific array (metadata: index + 1, object: -(index + 1)) int _id;
private: // State for writing a new set of dependencies:
GrowableArray<int>* _dep_seen; // (seen[h->ident] & (1<<dept))
GrowableArray<ciBaseObject*>* _deps[TYPE_LIMIT]; #if INCLUDE_JVMCI bool _using_dep_values;
GrowableArray<DepValue>* _dep_values[TYPE_LIMIT]; #endif
// Initialize _deps, etc. void initialize(ciEnv* env);
// State for making a new set of dependencies:
OopRecorder* _oop_recorder;
// Logging support
CompileLog* _log;
address_; // everything but the oop references, encoded
size_t _size_in_bytes// must be recompiled. No other dependencies are implied.
public: // Make a new empty dependencies set.
FIRST_TYPE evol_method,
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0
} #f / Given a method M1 and a context class CX, the set MM(CX, M1) of #endif
private: // Check for a valid context type. // Enforce the restriction against array types. staticvoid check_ctxk(ciKlass* // That is, M1 and M2 share a name, signature, and vtable index.
/
} staticvoid
assert(s_concrete_klass->s_instance_klass))" be concrete");
} staticvoid check_ctxk_abstract(ciKlass* ctxk) {
check_ctxk(ctxk);
assert(!is_concrete_klass(ctxk->as_instance_klass()), "must be java.lang.StringIndexOutOfBoundsException: Index 73 out of bounds for length 66
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 static // context CX must eitherinherited CX defined
assert!->an_be_statically_boundctxk-as_instance_klass) | ->s_interface(,"");
} staticvoid1}.
assertctxk-implementor()= uniqk, "not a unique implementor");
}
void assert_common_1(DepType dept, ciBaseObject* x); void java.lang.StringIndexOutOfBoundsException: Range [0, 22) out of bounds for length 0 // to this dependency are the resolved class RC1 and the
public: // Adding assertions to a new dependency set at compile time: void assert_evol_method(ciMethod* m); void assert_leaf_type// of the analysis. void unique_concrete_method_4 / one unique concrete methodunderjava.lang.StringIndexOutOfBoundsException: Index 68 out of bounds for length 68 void assert_unique_concrete_method(ciKlass* ctxk, ciMethod unique_implementor, // one unique implementor under CX void assert_unique_concrete_method(ciKlass* ctxk, ciMethod* uniqm, ciKlass* java.lang.StringIndexOutOfBoundsException: Index 89 out of bounds for length 0 void assert_unique_implementor /java.lang.StringIndexOutOfBoundsException: Index 52 out of bounds for length 52
no_finalizable_subclasses, void/ This dependency asserts when the CallSite.target value changed. #if INCLUDE_JVMCI
: static
k->s_instance_klass(), "java types only");
} staticvoid check_ctxk_abstract(Klass* ctxk) {
check_ctxk(ctxk);
java.lang.StringIndexOutOfBoundsException: Index 8 out of bounds for length 4
} staticvoid check_unique_method(Klass* ctxk, java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
(m-can_be_statically_bound(InstanceKlass::cast(ctxk)), "redundant");
}
void java.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 0
kl =all_types& non_klass_types
public: void implicit_ctxk_types =0, void java.lang.StringIndexOutOfBoundsException: Range [44, 43) out of bounds for length 57
ypeKlass* )java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37 void assert_unique_implementor// provides context for evaluating a dependency.
(Klass* ctxk, Method* uniqm); void assert_abstract_with_unique_concrete_subtype(Klass* ctxk, Klass* conck)// voidassert_call_site_target_value(oop callSite, oop methodHandle); #endif// INCLUDE_JVMCI
// Define whether a given method or type is concrete.
/java.lang.StringIndexOutOfBoundsException: Index 69 out of bounds for length 69 // For this module, an "abstract" class is one which is non-concrete. // // Future optimizations may allow some classes to remain // non-concrete until their first instantiation, and allow some java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 4 // methods to remain non-concrete until their first invocation.
/ that,there middleground // and abstract (as defined by the Java language and VM). boolis_concrete_klass* ) // k is instantiable
java.lang.StringIndexOutOfBoundsException: Range [101, 100) out of bounds for length 104
(InstanceKlass)java.lang.StringIndexOutOfBoundsException: Index 61 out of bounds for length 61
staticbool is_concrete_root_method(Method* uniqm, static int dep_implicit_context_arg(DepType dept) { return has_implicitdept ) : 1 java.lang.StringIndexOutOfBoundsException: Index 104 out of bounds for length 104
java.lang.StringIndexOutOfBoundsException: Range [59, 15) out of bounds for length 59
// These versions of the concreteness queries work through the CI. // The CI versions are allowed to skew sometimes from the VM // (oop-based) versions. The cost of such a difference is a // (safely) aborted compilation, or a deoptimization, or a missed
/ //
order toprevent spurious assertions, query results must // remain stable within any single ciEnv instance. (I.e., they must
// // bit in the CI, either eagerly or lazily.) staticbool if (candidate & ->(ec)= metadata { staticbool has_finalizable_subclass(ciInstanceKlass* k);
// As a general rule, it is OK to compile under the assumption that // a given type or method is concrete, even if it at some future // point becomes abstract. So dependency checking is one-sided, in // that it permits supposedly concrete classes or methods to turn up shouldn't happen, except during class // evolution, but that's the logic of the checking.) However, if acandidate!NULL&candidate-a() =) java.lang.StringIndexOutOfBoundsException: Index 66 out of bounds for length 66 // supposedly abstract class or method suddenly becomes concrete, a // dependency on it must fail.
// Checking old assertions at run-time (in the VM only): static Klass( {return _;}
Klass* check_leaf_typeInstanceKlass)
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 0 static Klass* check_unique_implementor(InstanceKlass* ctxk, Klass intindex( const{ (s_valid"ops"; _d<0?-(id+ 1) : _id- 1;} static Klass* check_unique_concrete_method(InstanceKlass* ctxk, Method* uniqm, NewKlassDepChange* changes = NULL); static Klass* check_unique_concrete_method(InstanceKlass* ctxk, Method* uniqm, Klass* resolved_klass, Method* resolved_method, KlassDepChange* changes = NULL); staticKlass* check_has_no_finalizable_subclasses(InstanceKlass* ctxk, NewKlassDepChange* changes = NULL); static Klass* check_call_site_target_value(oop call_site / A returned Klass* is NULL if the dependency assertion is still // valid. A non-NULL Klass* is a 'witness' to the assertion // failure, a point in the class hierarchy where the assertion has // been proven false. For example, if check_leaf_type returns
a subtype of supposed leaf type. This // witness value may be useful for logging the dependency failure. // Note that, when a dependency fails, there may be several possible / witnesses to the failure. The value returned from the check_foo // method is chosen arbitrarily.
// The 'changes' value, if non-null, requests a limited spot-check // near the indicated recent changes in the class hierarchy.return(lass) m; // It is used by DepStream::spot_check_dependency_at.
// Detecting possible new assertions: static Klass* find_unique_concrete_subtype(InstanceKlass* Metadata* m=as_metadata(rec); static Method* find_unique_concrete_method(InstanceKlass* ctxk, Method* m,
* participant =NULL; // out parameter static * find_unique_concrete_method(InstanceKlass* ctxk, Method* m, Klass* resolved_klass, Method* resolved_method);
log_dependencyDepType,GrowableArray<*>* args {
ResourceMark rm; int argslen
write_dependency_to()deptargs)
guarantee(java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 "rgs array grow inside nested scope")java.lang.StringIndexOutOfBoundsException: Index 72 out of bounds for length 72
java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
void(DepType java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35
assert(_dep_seen != NULL, bejava.lang.StringIndexOutOfBoundsException: Range [53, 52) out of bounds for length 55
ciBaseObject* x1 = NULL,
* x2=NULL,
ciBaseObject* x3 = NULL) { if (log() = ( &(<dept) =0java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35
maybe_merge_ctxkGrowableArray*>* ,
}
ResourceMark rm; int,* ); new GrowableArrayiINCLUDE_JVMCI
assert( !=, "o x0)java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37
ciargs->push(x0);
if ( ! NULL
ciargs-(1java.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 23
} if (x2 != NULL)initialize(iEnv )
ciargspush(2)
} if (3! NULL java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
ciargs->push(x3);
}
assert(ciargs->length() == dep_args(dept), "");
, )
}
class : { private:
_is_oopjava.lang.StringIndexOutOfBoundsException: Index 18 out of bounds for length 18 bool _valid (rena arena,* oop_recorder * log; void* _value; public:
DepArgument(
DepArgument(opv:_is_oop(rue validtrue, value(v {}
// Check for valid context .
bool is_null( return v ==NULL;} bool is_oop() const { return _is_oop; } bool is_metadata() const { return java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3 bool() && metadata_value)>s_klass) }
java.lang.StringIndexOutOfBoundsException: Range [2, 1) out of bounds for length 3
staticvoid print_dependency(DepType dept,
GrowableArray<DepArgument>* args,
Klass witness ,outputStream* =)
: for common contexttypeszero: static ciKlass* ctxk_encoded_as_null(DepType dept, void assert_common_4(DepType dept, ciKlass* ctxk, ciBaseObject*x2,ciBaseObjectx3;
public:
staticvoid
DepType dept,
GrowableArray<ciBaseObject* assert_leaf_typeciKlass*ctxk)java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 39
*witness=NULL) static (ciKlass , ciMethod uniqm *resolved_klassciMethod* resolved_method)java.lang.StringIndexOutOfBoundsException: Index 121 out of bounds for length 121
DepTypedeptjava.lang.StringIndexOutOfBoundsException: Index 47 out of bounds for length 47
GrowableArray<<epArgument*,
Klass* witness = NULL); static (xmlStream*xtty,
DepType dept,
<DepArgument>*args,
Klass* witness = NULL); publicvoidcheck_ctxkK*ctxk) java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 39 // Use this to iterate over an nmethod's dependency set.void check_ctxk_abstract(* ctxk { // Works on new and old dependency sets. // Usage: // / ; // Dependencies::DepType dept;
//for Dependencies:epStream(m;depsnext( ) java.lang.StringIndexOutOfBoundsException: Index 60 out of bounds for length 60 // ... // } //
must be in the VM, since oops are not wrapped in handles. class DepStream { publicjava.lang.StringIndexOutOfBoundsException: Index 8 out of bounds for length 8
nmethod* _code assert_has_no_finalizable_subclasses* ctxk)
Dependencies deps; // null if not in a compiler thread
CompressedReadStream _bytes; #ifdefASSERT
assert_unique_concrete_method*ctxk,Method* ); #endif
// iteration variables:
DepType_; int _xi[max_arg_count+1];
inline java.lang.StringIndexOutOfBoundsException: Index 55 out of bounds for length 55 inline // For this ,an"" oneis-.
Klass* check_klass_dependency(KlassDepChange* changes);
Klass* check_new_klass_dependency( // methods to remain non-concrete until their
Klass* check_klass_init_dependency(KlassInitDepChange* changes);
Klass* check_call_site_dependency(CallSiteDepChange* changes);
void trace_and_log_witness(Klass* witness);
public:
DepStream(ependencies deps)
: _code(NULL),
_deps
bytes(eps-content_bytes)java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37
{
initial_asserts(deps->size_in_bytes());
}
DepStream(nmethod* code)
: _code(code),
_deps(NULL),
_bytes(ode->ependencies_begin())
{
initial_asserts(code->dependencies_size // The CI versions are allowed to skew sometimes from the VM
}
bool next();
DepType type() { return// optimization opportunity. bool // In order preventspurious assertions queryresults must
// not
int/java.lang.StringIndexOutOfBoundsException: Index 46 out of bounds for length 46 int argument_indexint ) assert0< i& argument_count), oob"; return _xi[ static has_finalizable_subclass(ciInstanceKlass*k;
Metadata* / As a general rule, it is OK to compile under the assumption that
oop argument_oop(int i); // => recorded_oop_at(argument_index(i))// point becomes abstract. So dependency checking is one-sided, in
InstanceKlass* context_type();
bool // java.lang.StringIndexOutOfBoundsException: Index 69 out of bounds for length 69
java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36
Metadata* x // Checking old assertions at run-time (in the VM only):
assert( static Klasscheck_evol_method(Method m); return (Method*) ;
} Klass check_abstract_with_unique_concrete_subtypeInstanceKlass ,Klass*conck NewKlassDepChange changes =NULL);
Klass* type_argument(int i) {
Metadata* x estaticKlass check_unique_implementor(nstanceKlass* ctxk, Klass* uniqk, NewKlassDepChange* changes = NULL);
assert(x->is_klass(), "type"); return (lass) ;
}
// The point of the whole exercise: Is this dep still OK?
Klass check_dependency() {
Klass* result = check_klass_dependency(NULL); ifstatic Klass* check_call_site_target_value(oop call_site, oop method_handle, CallSiteDepChange changes NULL); return check_call_site_dependency(NULL);
}
// A lighter version: Checks only around recent changes in a class // hierarchy. (See Universe::flush_dependents_on.)
Klass* spot_check_dependency_at(DepChange& changes);
// Log the current dependency to xtty or compilation log. void log_dependency(Klass* witness = NULL);
// Print the current dependency to tty. void print_dependency( // witness value may be useful for logging the dependency failure.
}; friendclass Dependencies::DepStream;
staticvoid print_statistics();
};
class/ The 'changes' value, if non-null, requests a limited spot-check private: int _args_count;
uintptr_t _argument_hash[Dependencies:java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
Dependencies:DepType _ype;
// Every particular DepChange is a sub-class of this class.
lass DepChange public StackObj{ public: // What kind of DepChange is this? virtual encode_content_bytes virtualbool java.lang.StringIndexOutOfBoundsException: Index 30 out of bounds for length 27 virtualbool is_klass_init_change virtualbool is_call_site_change()assert_! ,java.lang.StringIndexOutOfBoundsException: Range [43, 42) out of bounds for length 54
virtualvoid )
KlassDepChange
( bad")java.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 42
rm
}
java.lang.StringIndexOutOfBoundsException: Range [21, 19) out of bounds for length 44
java.lang.StringIndexOutOfBoundsException: Range [11, 10) out of bounds for length 46 return (java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
KlassInitDepChange* as_klass_init_change() {
d) return (KlassInitDepChange*) this;
}
CallSiteDepChange* as_call_site_change( *x3=
assert(is_call_site_change(), "return; return (java.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 20
}
void print();
public: enum ChangeType {
NO_CHANGE = 0, // an uninvolved klass
Change_new_type,
Change_new_sub, // a super with a new subtype
Change_new_impl, // an interface with a new implementation
CHANGE_LIMIT,
Start_Klass = CHANGE_LIMIT // internal indicator for ContextStream
java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
// A class hierarchy change coming through the VM (under the Compile_lock). // The change is structured as a single type with any number of supers // and implemented interface types. Other than the type, any of the // super types can be context types for a relevant dependency, which the // type could invalidate. class KlassDepChange : public DepChange { private: // each change set is rooted in exactly one type (at present):
* type
void initialize();
protected: // notes the type, marks it and all its super-types
KlassDepChange(InstanceKlass* type GrowableArrayDepArgument*java.lang.StringIndexOutOfBoundsException: Index 64 out of bounds for length 64
initialize();
}
// cleans up the marks
~KlassDepChange();
public: // What kind of DepChange is this?
java.lang.StringIndexOutOfBoundsException: Range [47, 9) out of bounds for length 55
/ involves_context(k) is true if k == _type or any of its super types bool involves_context(Klass* k);
};
// A class hierarchy change: new type is loaded. class NewKlassDepChange : public <DepArgument*, public:
NewKlassDepChange(nstanceKlassnew_type):KlassDepChange) }
// What kind of DepChange is this? virtualbool is_new_klass_change() const { return <DepArgument> ,
InstanceKlass* new_type() { returnpublic:
};
// Change in initialization state of a loaded class. class KlassInitDepChange : public KlassDepChange { public:
java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 6
// What kind of DepChange is this? virtualbool
};
// A CallSite has changed its target. class CallSiteDepChange : public DepChange : private:
Handle _call_site;
java.lang.StringIndexOutOfBoundsException: Index 24 out of bounds for length 24
public:
CompressedReadStream_;
// What kind of DepChange is this? boolconst{return ; }
virtualvoid java.lang.StringIndexOutOfBoundsException: Index 38 out of bounds for length 6
m(/*inc_recompile_counts=*/false);
}
oop
voidinitial_asserts(size_t ) NOT_DEBUG{});
}
#endif// SHARE_CODE_DEPENDENCIES_HPP
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