--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/ci/ciStreams.cpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,367 @@
+/*
+ * Copyright 1999-2005 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_ciStreams.cpp.incl"
+
+// ciExceptionHandlerStream
+//
+// Walk over some selected set of a methods exception handlers.
+
+// ------------------------------------------------------------------
+// ciExceptionHandlerStream::count
+//
+// How many exception handlers are there in this stream?
+//
+// Implementation note: Compiler2 needs this functionality, so I had
+int ciExceptionHandlerStream::count() {
+ int save_pos = _pos;
+ int save_end = _end;
+
+ int count = 0;
+
+ _pos = -1;
+ _end = _method->_handler_count;
+
+
+ next();
+ while (!is_done()) {
+ count++;
+ next();
+ }
+
+ _pos = save_pos;
+ _end = save_end;
+
+ return count;
+}
+
+int ciExceptionHandlerStream::count_remaining() {
+ int save_pos = _pos;
+ int save_end = _end;
+
+ int count = 0;
+
+ while (!is_done()) {
+ count++;
+ next();
+ }
+
+ _pos = save_pos;
+ _end = save_end;
+
+ return count;
+}
+
+// ciBytecodeStream
+//
+// The class is used to iterate over the bytecodes of a method.
+// It hides the details of constant pool structure/access by
+// providing accessors for constant pool items.
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::wide
+//
+// Special handling for the wide bytcode
+Bytecodes::Code ciBytecodeStream::wide()
+{
+ // Get following bytecode; do not return wide
+ Bytecodes::Code bc = (Bytecodes::Code)_pc[1];
+ _pc += 2; // Skip both bytecodes
+ _pc += 2; // Skip index always
+ if( bc == Bytecodes::_iinc )
+ _pc += 2; // Skip optional constant
+ _was_wide = _pc; // Flag last wide bytecode found
+ return bc;
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::table
+//
+// Special handling for switch ops
+Bytecodes::Code ciBytecodeStream::table( Bytecodes::Code bc ) {
+ switch( bc ) { // Check for special bytecode handling
+
+ case Bytecodes::_lookupswitch:
+ _pc++; // Skip wide bytecode
+ _pc += (_start-_pc)&3; // Word align
+ _table_base = (jint*)_pc; // Capture for later usage
+ // table_base[0] is default far_dest
+ // Table has 2 lead elements (default, length), then pairs of u4 values.
+ // So load table length, and compute address at end of table
+ _pc = (address)&_table_base[2+ 2*Bytes::get_Java_u4((address)&_table_base[1])];
+ break;
+
+ case Bytecodes::_tableswitch: {
+ _pc++; // Skip wide bytecode
+ _pc += (_start-_pc)&3; // Word align
+ _table_base = (jint*)_pc; // Capture for later usage
+ // table_base[0] is default far_dest
+ int lo = Bytes::get_Java_u4((address)&_table_base[1]);// Low bound
+ int hi = Bytes::get_Java_u4((address)&_table_base[2]);// High bound
+ int len = hi - lo + 1; // Dense table size
+ _pc = (address)&_table_base[3+len]; // Skip past table
+ break;
+ }
+
+ default:
+ fatal("unhandled bytecode");
+ }
+ return bc;
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::reset_to_bci
+void ciBytecodeStream::reset_to_bci( int bci ) {
+ _bc_start=_was_wide=0;
+ _pc = _start+bci;
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::force_bci
+void ciBytecodeStream::force_bci(int bci) {
+ if (bci < 0) {
+ reset_to_bci(0);
+ _bc_start = _start + bci;
+ _bc = EOBC();
+ } else {
+ reset_to_bci(bci);
+ next();
+ }
+}
+
+
+// ------------------------------------------------------------------
+// Constant pool access
+// ------------------------------------------------------------------
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_klass_index
+//
+// If this bytecodes references a klass, return the index of the
+// referenced klass.
+int ciBytecodeStream::get_klass_index() const {
+ switch(cur_bc()) {
+ case Bytecodes::_ldc:
+ return get_index();
+ case Bytecodes::_ldc_w:
+ case Bytecodes::_ldc2_w:
+ case Bytecodes::_checkcast:
+ case Bytecodes::_instanceof:
+ case Bytecodes::_anewarray:
+ case Bytecodes::_multianewarray:
+ case Bytecodes::_new:
+ case Bytecodes::_newarray:
+ return get_index_big();
+ default:
+ ShouldNotReachHere();
+ return 0;
+ }
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_klass
+//
+// If this bytecode is a new, newarray, multianewarray, instanceof,
+// or checkcast, get the referenced klass.
+ciKlass* ciBytecodeStream::get_klass(bool& will_link) {
+ return CURRENT_ENV->get_klass_by_index(_holder, get_klass_index(),
+ will_link);
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_constant_index
+//
+// If this bytecode is one of the ldc variants, get the index of the
+// referenced constant.
+int ciBytecodeStream::get_constant_index() const {
+ switch(cur_bc()) {
+ case Bytecodes::_ldc:
+ return get_index();
+ case Bytecodes::_ldc_w:
+ case Bytecodes::_ldc2_w:
+ return get_index_big();
+ default:
+ ShouldNotReachHere();
+ return 0;
+ }
+}
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_constant
+//
+// If this bytecode is one of the ldc variants, get the referenced
+// constant.
+ciConstant ciBytecodeStream::get_constant() {
+ return CURRENT_ENV->get_constant_by_index(_holder, get_constant_index());
+}
+
+// ------------------------------------------------------------------
+bool ciBytecodeStream::is_unresolved_string() const {
+ return CURRENT_ENV->is_unresolved_string(_holder, get_constant_index());
+}
+
+// ------------------------------------------------------------------
+bool ciBytecodeStream::is_unresolved_klass() const {
+ return CURRENT_ENV->is_unresolved_klass(_holder, get_klass_index());
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_field_index
+//
+// If this is a field access bytecode, get the constant pool
+// index of the referenced field.
+int ciBytecodeStream::get_field_index() {
+ assert(cur_bc() == Bytecodes::_getfield ||
+ cur_bc() == Bytecodes::_putfield ||
+ cur_bc() == Bytecodes::_getstatic ||
+ cur_bc() == Bytecodes::_putstatic, "wrong bc");
+ return get_index_big();
+}
+
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_field
+//
+// If this bytecode is one of get_field, get_static, put_field,
+// or put_static, get the referenced field.
+ciField* ciBytecodeStream::get_field(bool& will_link) {
+ ciField* f = CURRENT_ENV->get_field_by_index(_holder, get_field_index());
+ will_link = f->will_link(_holder, _bc);
+ return f;
+}
+
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_declared_field_holder
+//
+// Get the declared holder of the currently referenced field.
+//
+// Usage note: the holder() of a ciField class returns the canonical
+// holder of the field, rather than the holder declared in the
+// bytecodes.
+//
+// There is no "will_link" result passed back. The user is responsible
+// for checking linkability when retrieving the associated field.
+ciInstanceKlass* ciBytecodeStream::get_declared_field_holder() {
+ int holder_index = get_field_holder_index();
+ bool ignore;
+ return CURRENT_ENV->get_klass_by_index(_holder, holder_index, ignore)
+ ->as_instance_klass();
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_field_holder_index
+//
+// Get the constant pool index of the declared holder of the field
+// referenced by the current bytecode. Used for generating
+// deoptimization information.
+int ciBytecodeStream::get_field_holder_index() {
+ VM_ENTRY_MARK;
+ constantPoolOop cpool = _holder->get_instanceKlass()->constants();
+ return cpool->klass_ref_index_at(get_field_index());
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_field_signature_index
+//
+// Get the constant pool index of the signature of the field
+// referenced by the current bytecode. Used for generating
+// deoptimization information.
+int ciBytecodeStream::get_field_signature_index() {
+ VM_ENTRY_MARK;
+ constantPoolOop cpool = _holder->get_instanceKlass()->constants();
+ int nt_index = cpool->name_and_type_ref_index_at(get_field_index());
+ return cpool->signature_ref_index_at(nt_index);
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_method_index
+//
+// If this is a method invocation bytecode, get the constant pool
+// index of the invoked method.
+int ciBytecodeStream::get_method_index() {
+ switch (cur_bc()) {
+ case Bytecodes::_invokeinterface:
+ return Bytes::get_Java_u2(_pc-4);
+ case Bytecodes::_invokevirtual:
+ case Bytecodes::_invokespecial:
+ case Bytecodes::_invokestatic:
+ return get_index_big();
+ default:
+ ShouldNotReachHere();
+ return 0;
+ }
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_method
+//
+// If this is a method invocation bytecode, get the invoked method.
+ciMethod* ciBytecodeStream::get_method(bool& will_link) {
+ ciMethod* m = CURRENT_ENV->get_method_by_index(_holder, get_method_index(),cur_bc());
+ will_link = m->is_loaded();
+ return m;
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_declared_method_holder
+//
+// Get the declared holder of the currently referenced method.
+//
+// Usage note: the holder() of a ciMethod class returns the canonical
+// holder of the method, rather than the holder declared in the
+// bytecodes.
+//
+// There is no "will_link" result passed back. The user is responsible
+// for checking linkability when retrieving the associated method.
+ciKlass* ciBytecodeStream::get_declared_method_holder() {
+ bool ignore;
+ return CURRENT_ENV->get_klass_by_index(_holder, get_method_holder_index(), ignore);
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_method_holder_index
+//
+// Get the constant pool index of the declared holder of the method
+// referenced by the current bytecode. Used for generating
+// deoptimization information.
+int ciBytecodeStream::get_method_holder_index() {
+ VM_ENTRY_MARK;
+ constantPoolOop cpool = _holder->get_instanceKlass()->constants();
+ return cpool->klass_ref_index_at(get_method_index());
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_method_signature_index
+//
+// Get the constant pool index of the signature of the method
+// referenced by the current bytecode. Used for generating
+// deoptimization information.
+int ciBytecodeStream::get_method_signature_index() {
+ VM_ENTRY_MARK;
+ constantPoolOop cpool = _holder->get_instanceKlass()->constants();
+ int method_index = get_method_index();
+ int name_and_type_index = cpool->name_and_type_ref_index_at(method_index);
+ return cpool->signature_ref_index_at(name_and_type_index);
+}