Mercurial > hg > graal-compiler
view src/share/vm/ci/ciStreams.cpp @ 974:26b774d693aa
Merge
author | acorn |
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date | Wed, 16 Sep 2009 09:10:57 -0400 |
parents | bd02caa94611 |
children | e66fd840cb6b |
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/* * Copyright 1999-2009 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() { #ifdef ASSERT switch (cur_bc()) { case Bytecodes::_invokeinterface: case Bytecodes::_invokevirtual: case Bytecodes::_invokespecial: case Bytecodes::_invokestatic: case Bytecodes::_invokedynamic: break; default: ShouldNotReachHere(); } #endif return get_index_int(); } // ------------------------------------------------------------------ // 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; // report as Dynamic for invokedynamic, which is syntactically classless if (cur_bc() == Bytecodes::_invokedynamic) return CURRENT_ENV->get_klass_by_name(_holder, ciSymbol::java_dyn_Dynamic(), false); 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); }