--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/ci/ciStreams.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,485 @@
+/*
+ * Copyright (c) 1999, 2016, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "ci/ciCallSite.hpp"
+#include "ci/ciConstant.hpp"
+#include "ci/ciField.hpp"
+#include "ci/ciStreams.hpp"
+#include "ci/ciUtilities.hpp"
+
+// 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::next_wide_or_table
+//
+// Special handling for switch ops
+Bytecodes::Code ciBytecodeStream::next_wide_or_table(Bytecodes::Code bc) {
+ switch (bc) { // Check for special bytecode handling
+ case Bytecodes::_wide:
+ // Special handling for the wide bytcode
+ // Get following bytecode; do not return wide
+ assert(Bytecodes::Code(_pc[0]) == Bytecodes::_wide, "");
+ bc = Bytecodes::java_code(_raw_bc = (Bytecodes::Code)_pc[1]);
+ assert(Bytecodes::wide_length_for(bc) > 2, "must make progress");
+ _pc += Bytecodes::wide_length_for(bc);
+ _was_wide = _pc; // Flag last wide bytecode found
+ assert(is_wide(), "accessor works right");
+ break;
+
+ 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_u1();
+ 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_u2();
+ 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) {
+ VM_ENTRY_MARK;
+ constantPoolHandle cpool(_method->get_Method()->constants());
+ return CURRENT_ENV->get_klass_by_index(cpool, get_klass_index(), will_link, _holder);
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_constant_raw_index
+//
+// If this bytecode is one of the ldc variants, get the index of the
+// referenced constant.
+int ciBytecodeStream::get_constant_raw_index() const {
+ // work-alike for Bytecode_loadconstant::raw_index()
+ switch (cur_bc()) {
+ case Bytecodes::_ldc:
+ return get_index_u1();
+ case Bytecodes::_ldc_w:
+ case Bytecodes::_ldc2_w:
+ return get_index_u2();
+ default:
+ ShouldNotReachHere();
+ return 0;
+ }
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_constant_pool_index
+// Decode any reference index into a regular pool index.
+int ciBytecodeStream::get_constant_pool_index() const {
+ // work-alike for Bytecode_loadconstant::pool_index()
+ int index = get_constant_raw_index();
+ if (has_cache_index()) {
+ VM_ENTRY_MARK;
+ constantPoolHandle cpool(_method->get_Method()->constants());
+ return cpool->object_to_cp_index(index);
+ }
+ return index;
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_constant_cache_index
+// Return the CP cache index, or -1 if there isn't any.
+int ciBytecodeStream::get_constant_cache_index() const {
+ // work-alike for Bytecode_loadconstant::cache_index()
+ return has_cache_index() ? get_constant_raw_index() : -1;
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_constant
+//
+// If this bytecode is one of the ldc variants, get the referenced
+// constant.
+ciConstant ciBytecodeStream::get_constant() {
+ int pool_index = get_constant_raw_index();
+ int cache_index = -1;
+ if (has_cache_index()) {
+ cache_index = pool_index;
+ pool_index = -1;
+ }
+ VM_ENTRY_MARK;
+ constantPoolHandle cpool(_method->get_Method()->constants());
+ return CURRENT_ENV->get_constant_by_index(cpool, pool_index, cache_index, _holder);
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_constant_pool_tag
+//
+// If this bytecode is one of the ldc variants, get the referenced
+// constant.
+constantTag ciBytecodeStream::get_constant_pool_tag(int index) const {
+ VM_ENTRY_MARK;
+ return _method->get_Method()->constants()->tag_at(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_u2_cpcache();
+}
+
+
+// ------------------------------------------------------------------
+// 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(_method, _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() {
+ VM_ENTRY_MARK;
+ constantPoolHandle cpool(_method->get_Method()->constants());
+ int holder_index = get_field_holder_index();
+ bool ignore;
+ return CURRENT_ENV->get_klass_by_index(cpool, holder_index, ignore, _holder)
+ ->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() {
+ GUARDED_VM_ENTRY(
+ ConstantPool* 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;
+ ConstantPool* 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
+ if (has_index_u4())
+ return get_index_u4(); // invokedynamic
+ return get_index_u2_cpcache();
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_method
+//
+// If this is a method invocation bytecode, get the invoked method.
+// Additionally return the declared signature to get more concrete
+// type information if required (Cf. invokedynamic and invokehandle).
+ciMethod* ciBytecodeStream::get_method(bool& will_link, ciSignature* *declared_signature_result) {
+ VM_ENTRY_MARK;
+ ciEnv* env = CURRENT_ENV;
+ constantPoolHandle cpool(THREAD, _method->get_Method()->constants());
+ ciMethod* m = env->get_method_by_index(cpool, get_method_index(), cur_bc(), _holder);
+ will_link = m->is_loaded();
+
+ // Use the MethodType stored in the CP cache to create a signature
+ // with correct types (in respect to class loaders).
+ if (has_method_type()) {
+ ciSymbol* sig_sym = env->get_symbol(cpool->symbol_at(get_method_signature_index(cpool)));
+ ciKlass* pool_holder = env->get_klass(cpool->pool_holder());
+ ciMethodType* method_type = get_method_type();
+ ciSignature* declared_signature = new (env->arena()) ciSignature(pool_holder, sig_sym, method_type);
+ (*declared_signature_result) = declared_signature;
+ } else {
+ (*declared_signature_result) = m->signature();
+ }
+ return m;
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::has_appendix
+//
+// Returns true if there is an appendix argument stored in the
+// constant pool cache at the current bci.
+bool ciBytecodeStream::has_appendix() {
+ VM_ENTRY_MARK;
+ constantPoolHandle cpool(_method->get_Method()->constants());
+ return ConstantPool::has_appendix_at_if_loaded(cpool, get_method_index());
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_appendix
+//
+// Return the appendix argument stored in the constant pool cache at
+// the current bci.
+ciObject* ciBytecodeStream::get_appendix() {
+ VM_ENTRY_MARK;
+ constantPoolHandle cpool(_method->get_Method()->constants());
+ oop appendix_oop = ConstantPool::appendix_at_if_loaded(cpool, get_method_index());
+ return CURRENT_ENV->get_object(appendix_oop);
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::has_method_type
+//
+// Returns true if there is a MethodType argument stored in the
+// constant pool cache at the current bci.
+bool ciBytecodeStream::has_method_type() {
+ GUARDED_VM_ENTRY(
+ constantPoolHandle cpool(_method->get_Method()->constants());
+ return ConstantPool::has_method_type_at_if_loaded(cpool, get_method_index());
+ )
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_method_type
+//
+// Return the MethodType stored in the constant pool cache at
+// the current bci.
+ciMethodType* ciBytecodeStream::get_method_type() {
+ GUARDED_VM_ENTRY(
+ constantPoolHandle cpool(_method->get_Method()->constants());
+ oop method_type_oop = ConstantPool::method_type_at_if_loaded(cpool, get_method_index());
+ return CURRENT_ENV->get_object(method_type_oop)->as_method_type();
+ )
+}
+
+// ------------------------------------------------------------------
+// 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() {
+ VM_ENTRY_MARK;
+ constantPoolHandle cpool(_method->get_Method()->constants());
+ bool ignore;
+ // report as MethodHandle for invokedynamic, which is syntactically classless
+ if (cur_bc() == Bytecodes::_invokedynamic)
+ return CURRENT_ENV->get_klass_by_name(_holder, ciSymbol::java_lang_invoke_MethodHandle(), false);
+ return CURRENT_ENV->get_klass_by_index(cpool, get_method_holder_index(), ignore, _holder);
+}
+
+// ------------------------------------------------------------------
+// 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() {
+ ConstantPool* cpool = _method->get_Method()->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(const constantPoolHandle& cpool) {
+ GUARDED_VM_ENTRY(
+ const int method_index = get_method_index();
+ const int name_and_type_index = cpool->name_and_type_ref_index_at(method_index);
+ return cpool->signature_ref_index_at(name_and_type_index);
+ )
+}
+
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_resolved_references
+ciObjArray* ciBytecodeStream::get_resolved_references() {
+ VM_ENTRY_MARK;
+ // Get the constant pool.
+ ConstantPool* cpool = _holder->get_instanceKlass()->constants();
+
+ // Create a resolved references array and return it.
+ return CURRENT_ENV->get_object(cpool->resolved_references())->as_obj_array();
+ }