// jvm.h - Header file for private implementation information. -*- c++ -*-
-/* Copyright (C) 1998, 1999, 2000 Free Software Foundation
+/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation
This file is part of libgcj.
#ifndef __JAVA_JVM_H__
#define __JAVA_JVM_H__
-// FIXME: __builtin_expect doesn't work yet.
-#define __builtin_expect(A,B) (A)
+// Define this before including jni.h.
+// jni.h is included by jvmpi.h, which might be included. We define
+// this unconditionally because it is convenient and it lets other
+// files include jni.h without difficulty.
+#define __GCJ_JNI_IMPL__
#include <gcj/javaprims.h>
#include <gcj/cni.h>
#include <gcj/field.h>
+/* Macro for possible unused arguments. */
+#define MAYBE_UNUSED __attribute__((__unused__))
+
/* Structure of the virtual table. */
struct _Jv_VTable
{
+#ifdef __ia64__
+ typedef struct { void *pc, *gp; } vtable_elt;
+#else
+ typedef void *vtable_elt;
+#endif
jclass clas;
- void *method[1];
+ void *gc_descr;
+
+ // This must be last, as derived classes "extend" this by
+ // adding new data members.
+ vtable_elt method[1];
+
+#ifdef __ia64__
+ void *get_method(int i) { return &method[i]; }
+ void set_method(int i, void *fptr) { method[i] = *(vtable_elt *)fptr; }
+ void *get_finalizer()
+ {
+ // We know that get_finalizer is only used for checking whether
+ // this object needs to have a finalizer registered. So it is
+ // safe to simply return just the PC component of the vtable
+ // slot.
+ return ((vtable_elt *)(get_method(0)))->pc;
+ }
+#else
+ void *get_method(int i) { return method[i]; }
+ void set_method(int i, void *fptr) { method[i] = fptr; }
+ void *get_finalizer() { return get_method(0); }
+#endif
+
+ static size_t vtable_elt_size() { return sizeof(vtable_elt); }
+
+ // Given a method index, return byte offset from the vtable pointer.
+ static jint idx_to_offset (int index)
+ {
+ return (2 * sizeof (void *)) + (index * vtable_elt_size ());
+ }
+ static _Jv_VTable *new_vtable (int count);
};
// Number of virtual methods on object. FIXME: it sucks that we have
// to keep this up to date by hand.
#define NUM_OBJECT_METHODS 5
-// This structure is the type of an array's vtable.
-struct _Jv_ArrayVTable
-{
- jclass clas;
- // `+1' because there is an extra slot for C++ RTTI compatibility.
- void *method[NUM_OBJECT_METHODS + 1];
-};
-
union _Jv_word
{
jobject o;
jdouble d;
};
+union _Jv_value
+{
+ jbyte byte_value;
+ jshort short_value;
+ jchar char_value;
+ jint int_value;
+ jlong long_value;
+ jfloat float_value;
+ jdouble double_value;
+ jobject object_value;
+};
+
/* Extract a character from a Java-style Utf8 string.
* PTR points to the current character.
* LIMIT points to the end of the Utf8 string.
typedef struct _Jv_Utf8Const Utf8Const;
_Jv_Utf8Const *_Jv_makeUtf8Const (char *s, int len);
_Jv_Utf8Const *_Jv_makeUtf8Const (jstring string);
-extern jboolean _Jv_equalUtf8Consts (_Jv_Utf8Const *, _Jv_Utf8Const *);
+extern jboolean _Jv_equalUtf8Consts (const _Jv_Utf8Const *, const _Jv_Utf8Const *);
extern jboolean _Jv_equal (_Jv_Utf8Const *, jstring, jint);
extern jboolean _Jv_equaln (_Jv_Utf8Const *, jstring, jint);
-#define StringClass _CL_Q34java4lang6String
-extern java::lang::Class StringClass;
+/* Helper class which converts a jstring to a temporary char*.
+ Uses the supplied buffer, if non-null. Otherwise, allocates
+ the buffer on the heap. Use the JV_TEMP_UTF_STRING macro,
+ which follows, to automatically allocate a stack buffer if
+ the string is small enough. */
+class _Jv_TempUTFString
+{
+public:
+ _Jv_TempUTFString(jstring jstr, char* buf=0);
+ ~_Jv_TempUTFString();
+
+// Accessors
+ operator const char*() const
+ {
+ return buf_;
+ }
+ const char* buf() const
+ {
+ return buf_;
+ }
+ char* buf()
+ {
+ return buf_;
+ }
+
+private:
+ char* buf_;
+ bool heapAllocated_;
+};
+
+inline _Jv_TempUTFString::_Jv_TempUTFString (jstring jstr, char* buf)
+ : buf_(0), heapAllocated_(false)
+{
+ if (!jstr) return;
+ jsize len = JvGetStringUTFLength (jstr);
+ if (buf)
+ buf_ = buf;
+ else
+ {
+ buf_ = (char*) _Jv_Malloc (len+1);
+ heapAllocated_ = true;
+ }
+
+ JvGetStringUTFRegion (jstr, 0, jstr->length(), buf_);
+ buf_[len] = '\0';
+}
+
+inline _Jv_TempUTFString::~_Jv_TempUTFString ()
+{
+ if (heapAllocated_)
+ _Jv_Free (buf_);
+}
+
+/* Macro which uses _Jv_TempUTFString. Allocates a stack-based
+ buffer if the string and its null terminator are <= 256
+ characters in length. Otherwise, a heap-based buffer is
+ used. The parameters to this macro are the variable name
+ which is an instance of _Jv_TempUTFString (above) and a
+ jstring.
+
+ Sample Usage:
+
+ jstring jstr = getAJString();
+ JV_TEMP_UTF_STRING(utfstr, jstr);
+ printf("The string is: %s\n", utfstr.buf());
+
+ */
+#define JV_TEMP_UTF_STRING(utfstr, jstr) \
+ jstring utfstr##thejstr = (jstr); \
+ jsize utfstr##_len = utfstr##thejstr ? JvGetStringUTFLength (utfstr##thejstr) + 1 : 0; \
+ char utfstr##_buf[utfstr##_len <= 256 ? utfstr##_len : 0]; \
+ _Jv_TempUTFString utfstr(utfstr##thejstr, sizeof(utfstr##_buf)==0 ? 0 : utfstr##_buf)
+
+namespace gcj
+{
+ /* Some constants used during lookup of special class methods. */
+ extern _Jv_Utf8Const *void_signature; /* "()V" */
+ extern _Jv_Utf8Const *clinit_name; /* "<clinit>" */
+ extern _Jv_Utf8Const *init_name; /* "<init>" */
+ extern _Jv_Utf8Const *finit_name; /* "finit$", */
+
+ /* Set to true by _Jv_CreateJavaVM. */
+ extern bool runtimeInitialized;
+
+ /* Print out class names as they are initialized. */
+ extern bool verbose_class_flag;
+}
+
+// This class handles all aspects of class preparation and linking.
+class _Jv_Linker
+{
+private:
+ static _Jv_Field *find_field_helper(jclass, _Jv_Utf8Const *, _Jv_Utf8Const *,
+ jclass *);
+ static _Jv_Field *find_field(jclass, jclass, _Jv_Utf8Const *,
+ _Jv_Utf8Const *);
+ static void prepare_constant_time_tables(jclass);
+ static jshort get_interfaces(jclass, _Jv_ifaces *);
+ static void link_symbol_table(jclass);
+ static void link_exception_table(jclass);
+ static void layout_interface_methods(jclass);
+ static void layout_vtable_methods(jclass);
+ static void set_vtable_entries(jclass, _Jv_VTable *);
+ static void make_vtable(jclass);
+ static void ensure_fields_laid_out(jclass);
+ static void ensure_class_linked(jclass);
+ static void ensure_supers_installed(jclass);
+ static void add_miranda_methods(jclass, jclass);
+ static void ensure_method_table_complete(jclass);
+ static void verify_class(jclass);
+ static jshort find_iindex(jclass *, jshort *, jshort);
+ static jshort indexof(void *, void **, jshort);
+ static int get_alignment_from_class(jclass);
+ static void generate_itable(jclass, _Jv_ifaces *, jshort *);
+ static jshort append_partial_itable(jclass, jclass, void **, jshort);
+ static _Jv_Method *search_method_in_class (jclass, jclass,
+ _Jv_Utf8Const *,
+ _Jv_Utf8Const *);
+
+public:
+
+ static bool has_field_p (jclass, _Jv_Utf8Const *);
+ static void print_class_loaded (jclass);
+ static void resolve_class_ref (jclass, jclass *);
+ static void wait_for_state(jclass, int);
+ static _Jv_word resolve_pool_entry (jclass, int);
+ static void resolve_field (_Jv_Field *, java::lang::ClassLoader *);
+ static void verify_type_assertions (jclass);
+};
/* Type of pointer used as finalizer. */
typedef void _Jv_FinalizerFunc (jobject);
/* Allocate space for a new Java object. */
-void *_Jv_AllocObj (jsize size) __attribute__((__malloc__));
+void *_Jv_AllocObj (jsize size, jclass cl) __attribute__((__malloc__));
+/* Allocate space for a potentially uninitialized pointer-free object.
+ Interesting only with JV_HASH_SYNCHRONIZATION. */
+void *_Jv_AllocPtrFreeObj (jsize size, jclass cl) __attribute__((__malloc__));
/* Allocate space for an array of Java objects. */
-void *_Jv_AllocArray (jsize size) __attribute__((__malloc__));
+void *_Jv_AllocArray (jsize size, jclass cl) __attribute__((__malloc__));
/* Allocate space that is known to be pointer-free. */
void *_Jv_AllocBytes (jsize size) __attribute__((__malloc__));
+/* Allocate space for a new non-Java object, which does not have the usual
+ Java object header but may contain pointers to other GC'ed objects. */
+void *_Jv_AllocRawObj (jsize size) __attribute__((__malloc__));
+/* Explicitly throw an out-of-memory exception. */
+void _Jv_ThrowNoMemory() __attribute__((__noreturn__));
+/* Allocate an object with a single pointer. The first word is reserved
+ for the GC, and the second word is the traced pointer. */
+void *_Jv_AllocTraceOne (jsize size /* incl. reserved slot */);
+/* Ditto, but for two traced pointers. */
+void *_Jv_AllocTraceTwo (jsize size /* incl. reserved slot */);
/* Initialize the GC. */
void _Jv_InitGC (void);
/* Register a finalizer. */
void _Jv_RegisterFinalizer (void *object, _Jv_FinalizerFunc *method);
+/* Compute the GC descriptor for a class */
+void * _Jv_BuildGCDescr(jclass);
/* Allocate some unscanned, unmoveable memory. Return NULL if out of
memory. */
void *_Jv_MallocUnchecked (jsize size) __attribute__((__malloc__));
+/* Initialize finalizers. The argument is a function to be called
+ when a finalizer is ready to be run. */
+void _Jv_GCInitializeFinalizers (void (*notifier) (void));
/* Run finalizers for objects ready to be finalized.. */
void _Jv_RunFinalizers (void);
/* Run all finalizers. Should be called only before exit. */
/* Disable and enable GC. */
void _Jv_DisableGC (void);
void _Jv_EnableGC (void);
+/* Register a disappearing link. This is a field F which should be
+ cleared when *F is found to be inaccessible. This is used in the
+ implementation of java.lang.ref.Reference. */
+void _Jv_GCRegisterDisappearingLink (jobject *objp);
+/* Return true if OBJECT should be reclaimed. This is used to
+ implement soft references. */
+jboolean _Jv_GCCanReclaimSoftReference (jobject obj);
+
+/* Register a finalizer for a String object. This is only used by
+ the intern() implementation. */
+void _Jv_RegisterStringFinalizer (jobject str);
+/* This is called to actually finalize a possibly-intern()d String. */
+void _Jv_FinalizeString (jobject str);
/* Return approximation of total size of heap. */
long _Jv_GCTotalMemory (void);
_Jv_GCSetMaximumHeapSize. */
void _Jv_SetMaximumHeapSize (const char *arg);
-/* Allocate some unscanned bytes. Throw exception if out of memory. */
-void *_Jv_AllocBytesChecked (jsize size) __attribute__((__malloc__));
-
extern "C" void JvRunMain (jclass klass, int argc, const char **argv);
-void _Jv_RunMain (const char* name, int argc, const char **argv, bool is_jar);
+void _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
+ bool is_jar);
+
+// Delayed until after _Jv_AllocBytes is declared.
+//
+// Note that we allocate this as unscanned memory -- the vtables
+// are handled specially by the GC.
+
+inline _Jv_VTable *
+_Jv_VTable::new_vtable (int count)
+{
+ size_t size = sizeof(_Jv_VTable) + (count - 1) * vtable_elt_size ();
+ return (_Jv_VTable *) _Jv_AllocBytes (size);
+}
+
+// Determine if METH gets an entry in a VTable.
+static inline jboolean _Jv_isVirtualMethod (_Jv_Method *meth)
+{
+ using namespace java::lang::reflect;
+ return (((meth->accflags & (Modifier::STATIC | Modifier::PRIVATE)) == 0)
+ && meth->name->first() != '<');
+}
// This function is used to determine the hash code of an object.
inline jint
_Jv_HashCode (jobject obj)
{
// This was chosen to yield relatively well distributed results on
- // both 32- and 64-bit architectures.
- return (jint) ((unsigned long long) obj % 0x7fffffff);
+ // both 32- and 64-bit architectures. Note 0x7fffffff is prime.
+ // FIXME: we assume sizeof(long) == sizeof(void *).
+ return (jint) ((unsigned long) obj % 0x7fffffff);
}
// Return a raw pointer to the elements of an array given the array
return elts;
}
-extern "C" void _Jv_ThrowBadArrayIndex (jint bad_index);
-extern "C" void _Jv_ThrowNullPointerException (void);
+extern "C" void _Jv_ThrowBadArrayIndex (jint bad_index)
+ __attribute__((noreturn));
+extern "C" void _Jv_ThrowNullPointerException (void)
+ __attribute__((noreturn));
extern "C" jobject _Jv_NewArray (jint type, jint size)
__attribute__((__malloc__));
extern "C" jobject _Jv_NewMultiArray (jclass klass, jint dims, ...)
int meth_idx);
extern "C" void _Jv_CheckArrayStore (jobject array, jobject obj);
extern "C" void _Jv_RegisterClass (jclass klass);
-extern "C" void _Jv_RegisterClasses (jclass *classes);
+extern "C" void _Jv_RegisterClasses (const jclass *classes);
+extern "C" void _Jv_RegisterClasses_Counted (const jclass *classes,
+ size_t count);
+extern "C" void _Jv_RegisterResource (void *vptr);
extern void _Jv_UnregisterClass (_Jv_Utf8Const*, java::lang::ClassLoader*);
extern jclass _Jv_FindClass (_Jv_Utf8Const *name,
JArray<jclass> **arg_types_out,
jclass *return_type_out);
+extern jboolean _Jv_CheckAccess (jclass self_klass, jclass other_klass,
+ jint flags);
+
extern jobject _Jv_CallAnyMethodA (jobject obj, jclass return_type,
jmethodID meth, jboolean is_constructor,
JArray<jclass> *parameter_types,
- jobjectArray args);
+ jobjectArray args,
+ jclass iface = NULL);
union jvalue;
-extern jthrowable _Jv_CallAnyMethodA (jobject obj,
- jclass return_type,
- jmethodID meth,
- jboolean is_constructor,
- JArray<jclass> *parameter_types,
- jvalue *args,
- jvalue *result);
+extern void _Jv_CallAnyMethodA (jobject obj,
+ jclass return_type,
+ jmethodID meth,
+ jboolean is_constructor,
+ jboolean is_virtual_call,
+ JArray<jclass> *parameter_types,
+ jvalue *args,
+ jvalue *result,
+ jboolean is_jni_call = true,
+ jclass iface = NULL);
extern jobject _Jv_NewMultiArray (jclass, jint ndims, jint* dims)
__attribute__((__malloc__));
jlong _Jv_remJ (jlong, jlong);
}
-/* get/set the name of the running executable. */
-extern char *_Jv_ThisExecutable (void);
-extern void _Jv_ThisExecutable (const char *);
+/* Get the number of arguments (cf. argc) or 0 if our argument
+ list was never initialized. */
+extern int _Jv_GetNbArgs (void);
+
+/* Get the specified argument (cf. argv[index]) or "" if either
+ our argument list was never initialized or the specified index
+ is out of bounds. */
+extern const char * _Jv_GetSafeArg (int index);
+
+/* Sets our argument list. Can be used by programs with non-standard
+ entry points. */
+extern void _Jv_SetArgs (int argc, const char **argv);
+
+/* Get the name of the running executable. */
+extern const char *_Jv_ThisExecutable (void);
/* Return a pointer to a symbol in executable or loaded library. */
void *_Jv_FindSymbolInExecutable (const char *);
_Jv_JNIEnv *_Jv_GetCurrentJNIEnv ();
void _Jv_SetCurrentJNIEnv (_Jv_JNIEnv *);
+/* Free a JNIEnv. */
+void _Jv_FreeJNIEnv (_Jv_JNIEnv *);
+
+/* Free a JNIEnv. */
+void _Jv_FreeJNIEnv (_Jv_JNIEnv *);
+
struct _Jv_JavaVM;
-_Jv_JavaVM *_Jv_GetJavaVM ();
+_Jv_JavaVM *_Jv_GetJavaVM ();
+
+// Some verification functions from defineclass.cc.
+bool _Jv_VerifyFieldSignature (_Jv_Utf8Const*sig);
+bool _Jv_VerifyMethodSignature (_Jv_Utf8Const*sig);
+bool _Jv_VerifyClassName (unsigned char* ptr, _Jv_ushort length);
+bool _Jv_VerifyClassName (_Jv_Utf8Const *name);
+bool _Jv_VerifyIdentifier (_Jv_Utf8Const *);
+bool _Jv_ClassNameSamePackage (_Jv_Utf8Const *name1, _Jv_Utf8Const *name2);
+
+struct _Jv_core_chain
+{
+ int name_length;
+ const char *name;
+ int data_length;
+ const void *data;
+
+ struct _Jv_core_chain *next;
+};
+
+// This is called when new core data is loaded.
+extern void (*_Jv_RegisterCoreHook) (_Jv_core_chain *);
+
+_Jv_core_chain *_Jv_FindCore (_Jv_core_chain *node, jstring name);
+void _Jv_FreeCoreChain (_Jv_core_chain *chain);
#ifdef ENABLE_JVMPI
+
#include "jvmpi.h"
extern void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
extern void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
#endif
+/* FIXME: this should really be defined in some more generic place */
+#define ROUND(V, A) (((((unsigned) (V))-1) | ((A)-1))+1)
+
+extern void _Jv_RegisterBootstrapPackages ();
+
+
+// This is used to find ABI versions we recognize.
+#define GCJ_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 10)
+#define GCJ_BINARYCOMPAT_ADDITION 5
+
+inline bool
+_Jv_CheckABIVersion (unsigned long value)
+{
+ // For this release, recognize just our defined C++ ABI and our
+ // defined BC ABI. (In the future we may recognize past BC ABIs as
+ // well.)
+ return (value == GCJ_VERSION
+ || value == (GCJ_VERSION + GCJ_BINARYCOMPAT_ADDITION));
+}
+
+// It makes the source cleaner if we simply always define this
+// function. If the interpreter is not built, it will never return
+// 'true'.
+extern inline jboolean
+_Jv_IsInterpretedClass (jclass c)
+{
+ return (c->accflags & java::lang::reflect::Modifier::INTERPRETED) != 0;
+}
+
#endif /* __JAVA_JVM_H__ */
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