Mercurial > hg > truffle
diff src/share/vm/ci/ciStreams.cpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | be93aad57795 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/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); +}