1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/code/compiledIC.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,618 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "classfile/systemDictionary.hpp"
1.30 +#include "code/codeCache.hpp"
1.31 +#include "code/compiledIC.hpp"
1.32 +#include "code/icBuffer.hpp"
1.33 +#include "code/nmethod.hpp"
1.34 +#include "code/vtableStubs.hpp"
1.35 +#include "interpreter/interpreter.hpp"
1.36 +#include "interpreter/linkResolver.hpp"
1.37 +#include "memory/metadataFactory.hpp"
1.38 +#include "memory/oopFactory.hpp"
1.39 +#include "oops/method.hpp"
1.40 +#include "oops/oop.inline.hpp"
1.41 +#include "oops/symbol.hpp"
1.42 +#include "runtime/icache.hpp"
1.43 +#include "runtime/sharedRuntime.hpp"
1.44 +#include "runtime/stubRoutines.hpp"
1.45 +#include "utilities/events.hpp"
1.46 +
1.47 +
1.48 +// Every time a compiled IC is changed or its type is being accessed,
1.49 +// either the CompiledIC_lock must be set or we must be at a safe point.
1.50 +
1.51 +//-----------------------------------------------------------------------------
1.52 +// Low-level access to an inline cache. Private, since they might not be
1.53 +// MT-safe to use.
1.54 +
1.55 +void* CompiledIC::cached_value() const {
1.56 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.57 + assert (!is_optimized(), "an optimized virtual call does not have a cached metadata");
1.58 +
1.59 + if (!is_in_transition_state()) {
1.60 + void* data = (void*)_value->data();
1.61 + // If we let the metadata value here be initialized to zero...
1.62 + assert(data != NULL || Universe::non_oop_word() == NULL,
1.63 + "no raw nulls in CompiledIC metadatas, because of patching races");
1.64 + return (data == (void*)Universe::non_oop_word()) ? NULL : data;
1.65 + } else {
1.66 + return InlineCacheBuffer::cached_value_for((CompiledIC *)this);
1.67 + }
1.68 +}
1.69 +
1.70 +
1.71 +void CompiledIC::internal_set_ic_destination(address entry_point, bool is_icstub, void* cache, bool is_icholder) {
1.72 + assert(entry_point != NULL, "must set legal entry point");
1.73 + assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.74 + assert (!is_optimized() || cache == NULL, "an optimized virtual call does not have a cached metadata");
1.75 + assert (cache == NULL || cache != (Metadata*)badOopVal, "invalid metadata");
1.76 +
1.77 + assert(!is_icholder || is_icholder_entry(entry_point), "must be");
1.78 +
1.79 + // Don't use ic_destination for this test since that forwards
1.80 + // through ICBuffer instead of returning the actual current state of
1.81 + // the CompiledIC.
1.82 + if (is_icholder_entry(_ic_call->destination())) {
1.83 + // When patching for the ICStub case the cached value isn't
1.84 + // overwritten until the ICStub copied into the CompiledIC during
1.85 + // the next safepoint. Make sure that the CompiledICHolder* is
1.86 + // marked for release at this point since it won't be identifiable
1.87 + // once the entry point is overwritten.
1.88 + InlineCacheBuffer::queue_for_release((CompiledICHolder*)_value->data());
1.89 + }
1.90 +
1.91 + if (TraceCompiledIC) {
1.92 + tty->print(" ");
1.93 + print_compiled_ic();
1.94 + tty->print(" changing destination to " INTPTR_FORMAT, p2i(entry_point));
1.95 + if (!is_optimized()) {
1.96 + tty->print(" changing cached %s to " INTPTR_FORMAT, is_icholder ? "icholder" : "metadata", p2i((address)cache));
1.97 + }
1.98 + if (is_icstub) {
1.99 + tty->print(" (icstub)");
1.100 + }
1.101 + tty->cr();
1.102 + }
1.103 +
1.104 + {
1.105 + MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1.106 +#ifdef ASSERT
1.107 + CodeBlob* cb = CodeCache::find_blob_unsafe(_ic_call);
1.108 + assert(cb != NULL && cb->is_nmethod(), "must be nmethod");
1.109 +#endif
1.110 + _ic_call->set_destination_mt_safe(entry_point);
1.111 +}
1.112 +
1.113 + if (is_optimized() || is_icstub) {
1.114 + // Optimized call sites don't have a cache value and ICStub call
1.115 + // sites only change the entry point. Changing the value in that
1.116 + // case could lead to MT safety issues.
1.117 + assert(cache == NULL, "must be null");
1.118 + return;
1.119 + }
1.120 +
1.121 + if (cache == NULL) cache = (void*)Universe::non_oop_word();
1.122 +
1.123 + _value->set_data((intptr_t)cache);
1.124 +}
1.125 +
1.126 +
1.127 +void CompiledIC::set_ic_destination(ICStub* stub) {
1.128 + internal_set_ic_destination(stub->code_begin(), true, NULL, false);
1.129 +}
1.130 +
1.131 +
1.132 +
1.133 +address CompiledIC::ic_destination() const {
1.134 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.135 + if (!is_in_transition_state()) {
1.136 + return _ic_call->destination();
1.137 + } else {
1.138 + return InlineCacheBuffer::ic_destination_for((CompiledIC *)this);
1.139 + }
1.140 +}
1.141 +
1.142 +
1.143 +bool CompiledIC::is_in_transition_state() const {
1.144 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.145 + return InlineCacheBuffer::contains(_ic_call->destination());
1.146 +}
1.147 +
1.148 +
1.149 +bool CompiledIC::is_icholder_call() const {
1.150 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.151 + return !_is_optimized && is_icholder_entry(ic_destination());
1.152 +}
1.153 +
1.154 +// Returns native address of 'call' instruction in inline-cache. Used by
1.155 +// the InlineCacheBuffer when it needs to find the stub.
1.156 +address CompiledIC::stub_address() const {
1.157 + assert(is_in_transition_state(), "should only be called when we are in a transition state");
1.158 + return _ic_call->destination();
1.159 +}
1.160 +
1.161 +
1.162 +//-----------------------------------------------------------------------------
1.163 +// High-level access to an inline cache. Guaranteed to be MT-safe.
1.164 +
1.165 +
1.166 +bool CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) {
1.167 + assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.168 + assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic");
1.169 + assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?");
1.170 +
1.171 + address entry;
1.172 + if (call_info->call_kind() == CallInfo::itable_call) {
1.173 + assert(bytecode == Bytecodes::_invokeinterface, "");
1.174 + int itable_index = call_info->itable_index();
1.175 + entry = VtableStubs::find_itable_stub(itable_index);
1.176 + if (entry == false) {
1.177 + return false;
1.178 + }
1.179 +#ifdef ASSERT
1.180 + int index = call_info->resolved_method()->itable_index();
1.181 + assert(index == itable_index, "CallInfo pre-computes this");
1.182 +#endif //ASSERT
1.183 + InstanceKlass* k = call_info->resolved_method()->method_holder();
1.184 + assert(k->verify_itable_index(itable_index), "sanity check");
1.185 + InlineCacheBuffer::create_transition_stub(this, k, entry);
1.186 + } else {
1.187 + assert(call_info->call_kind() == CallInfo::vtable_call, "either itable or vtable");
1.188 + // Can be different than selected_method->vtable_index(), due to package-private etc.
1.189 + int vtable_index = call_info->vtable_index();
1.190 + assert(call_info->resolved_klass()->verify_vtable_index(vtable_index), "sanity check");
1.191 + entry = VtableStubs::find_vtable_stub(vtable_index);
1.192 + if (entry == NULL) {
1.193 + return false;
1.194 + }
1.195 + InlineCacheBuffer::create_transition_stub(this, NULL, entry);
1.196 + }
1.197 +
1.198 + if (TraceICs) {
1.199 + ResourceMark rm;
1.200 + tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT,
1.201 + p2i(instruction_address()), call_info->selected_method()->print_value_string(), p2i(entry));
1.202 + }
1.203 +
1.204 + // We can't check this anymore. With lazy deopt we could have already
1.205 + // cleaned this IC entry before we even return. This is possible if
1.206 + // we ran out of space in the inline cache buffer trying to do the
1.207 + // set_next and we safepointed to free up space. This is a benign
1.208 + // race because the IC entry was complete when we safepointed so
1.209 + // cleaning it immediately is harmless.
1.210 + // assert(is_megamorphic(), "sanity check");
1.211 + return true;
1.212 +}
1.213 +
1.214 +
1.215 +// true if destination is megamorphic stub
1.216 +bool CompiledIC::is_megamorphic() const {
1.217 + assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.218 + assert(!is_optimized(), "an optimized call cannot be megamorphic");
1.219 +
1.220 + // Cannot rely on cached_value. It is either an interface or a method.
1.221 + return VtableStubs::is_entry_point(ic_destination());
1.222 +}
1.223 +
1.224 +bool CompiledIC::is_call_to_compiled() const {
1.225 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.226 +
1.227 + // Use unsafe, since an inline cache might point to a zombie method. However, the zombie
1.228 + // method is guaranteed to still exist, since we only remove methods after all inline caches
1.229 + // has been cleaned up
1.230 + CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
1.231 + bool is_monomorphic = (cb != NULL && cb->is_nmethod());
1.232 + // Check that the cached_value is a klass for non-optimized monomorphic calls
1.233 + // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used
1.234 + // for calling directly to vep without using the inline cache (i.e., cached_value == NULL)
1.235 +#ifdef ASSERT
1.236 + CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address());
1.237 + bool is_c1_method = caller->is_compiled_by_c1();
1.238 + assert( is_c1_method ||
1.239 + !is_monomorphic ||
1.240 + is_optimized() ||
1.241 + (cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check");
1.242 +#endif // ASSERT
1.243 + return is_monomorphic;
1.244 +}
1.245 +
1.246 +
1.247 +bool CompiledIC::is_call_to_interpreted() const {
1.248 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.249 + // Call to interpreter if destination is either calling to a stub (if it
1.250 + // is optimized), or calling to an I2C blob
1.251 + bool is_call_to_interpreted = false;
1.252 + if (!is_optimized()) {
1.253 + // must use unsafe because the destination can be a zombie (and we're cleaning)
1.254 + // and the print_compiled_ic code wants to know if site (in the non-zombie)
1.255 + // is to the interpreter.
1.256 + CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
1.257 + is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob());
1.258 + assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check");
1.259 + } else {
1.260 + // Check if we are calling into our own codeblob (i.e., to a stub)
1.261 + CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address());
1.262 + address dest = ic_destination();
1.263 +#ifdef ASSERT
1.264 + {
1.265 + CodeBlob* db = CodeCache::find_blob_unsafe(dest);
1.266 + assert(!db->is_adapter_blob(), "must use stub!");
1.267 + }
1.268 +#endif /* ASSERT */
1.269 + is_call_to_interpreted = cb->contains(dest);
1.270 + }
1.271 + return is_call_to_interpreted;
1.272 +}
1.273 +
1.274 +
1.275 +void CompiledIC::set_to_clean() {
1.276 + assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call");
1.277 + if (TraceInlineCacheClearing || TraceICs) {
1.278 + tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", p2i(instruction_address()));
1.279 + print();
1.280 + }
1.281 +
1.282 + address entry;
1.283 + if (is_optimized()) {
1.284 + entry = SharedRuntime::get_resolve_opt_virtual_call_stub();
1.285 + } else {
1.286 + entry = SharedRuntime::get_resolve_virtual_call_stub();
1.287 + }
1.288 +
1.289 + // A zombie transition will always be safe, since the metadata has already been set to NULL, so
1.290 + // we only need to patch the destination
1.291 + bool safe_transition = is_optimized() || SafepointSynchronize::is_at_safepoint();
1.292 +
1.293 + if (safe_transition) {
1.294 + // Kill any leftover stub we might have too
1.295 + if (is_in_transition_state()) {
1.296 + ICStub* old_stub = ICStub_from_destination_address(stub_address());
1.297 + old_stub->clear();
1.298 + }
1.299 + if (is_optimized()) {
1.300 + set_ic_destination(entry);
1.301 + } else {
1.302 + set_ic_destination_and_value(entry, (void*)NULL);
1.303 + }
1.304 + } else {
1.305 + // Unsafe transition - create stub.
1.306 + InlineCacheBuffer::create_transition_stub(this, NULL, entry);
1.307 + }
1.308 + // We can't check this anymore. With lazy deopt we could have already
1.309 + // cleaned this IC entry before we even return. This is possible if
1.310 + // we ran out of space in the inline cache buffer trying to do the
1.311 + // set_next and we safepointed to free up space. This is a benign
1.312 + // race because the IC entry was complete when we safepointed so
1.313 + // cleaning it immediately is harmless.
1.314 + // assert(is_clean(), "sanity check");
1.315 +}
1.316 +
1.317 +
1.318 +bool CompiledIC::is_clean() const {
1.319 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.320 + bool is_clean = false;
1.321 + address dest = ic_destination();
1.322 + is_clean = dest == SharedRuntime::get_resolve_opt_virtual_call_stub() ||
1.323 + dest == SharedRuntime::get_resolve_virtual_call_stub();
1.324 + assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check");
1.325 + return is_clean;
1.326 +}
1.327 +
1.328 +
1.329 +void CompiledIC::set_to_monomorphic(CompiledICInfo& info) {
1.330 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.331 + // Updating a cache to the wrong entry can cause bugs that are very hard
1.332 + // to track down - if cache entry gets invalid - we just clean it. In
1.333 + // this way it is always the same code path that is responsible for
1.334 + // updating and resolving an inline cache
1.335 + //
1.336 + // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized
1.337 + // callsites. In addition ic_miss code will update a site to monomorphic if it determines
1.338 + // that an monomorphic call to the interpreter can now be monomorphic to compiled code.
1.339 + //
1.340 + // In both of these cases the only thing being modifed is the jump/call target and these
1.341 + // transitions are mt_safe
1.342 +
1.343 + Thread *thread = Thread::current();
1.344 + if (info.to_interpreter()) {
1.345 + // Call to interpreter
1.346 + if (info.is_optimized() && is_optimized()) {
1.347 + assert(is_clean(), "unsafe IC path");
1.348 + MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1.349 + // the call analysis (callee structure) specifies that the call is optimized
1.350 + // (either because of CHA or the static target is final)
1.351 + // At code generation time, this call has been emitted as static call
1.352 + // Call via stub
1.353 + assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check");
1.354 + CompiledStaticCall* csc = compiledStaticCall_at(instruction_address());
1.355 + methodHandle method (thread, (Method*)info.cached_metadata());
1.356 + csc->set_to_interpreted(method, info.entry());
1.357 + if (TraceICs) {
1.358 + ResourceMark rm(thread);
1.359 + tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter: %s",
1.360 + p2i(instruction_address()),
1.361 + method->print_value_string());
1.362 + }
1.363 + } else {
1.364 + // Call via method-klass-holder
1.365 + InlineCacheBuffer::create_transition_stub(this, info.claim_cached_icholder(), info.entry());
1.366 + if (TraceICs) {
1.367 + ResourceMark rm(thread);
1.368 + tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", p2i(instruction_address()));
1.369 + }
1.370 + }
1.371 + } else {
1.372 + // Call to compiled code
1.373 + bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL);
1.374 +#ifdef ASSERT
1.375 + CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry());
1.376 + assert (cb->is_nmethod(), "must be compiled!");
1.377 +#endif /* ASSERT */
1.378 +
1.379 + // This is MT safe if we come from a clean-cache and go through a
1.380 + // non-verified entry point
1.381 + bool safe = SafepointSynchronize::is_at_safepoint() ||
1.382 + (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean()));
1.383 +
1.384 + if (!safe) {
1.385 + InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry());
1.386 + } else {
1.387 + if (is_optimized()) {
1.388 + set_ic_destination(info.entry());
1.389 + } else {
1.390 + set_ic_destination_and_value(info.entry(), info.cached_metadata());
1.391 + }
1.392 + }
1.393 +
1.394 + if (TraceICs) {
1.395 + ResourceMark rm(thread);
1.396 + assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be");
1.397 + tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s",
1.398 + p2i(instruction_address()),
1.399 + ((Klass*)info.cached_metadata())->print_value_string(),
1.400 + (safe) ? "" : "via stub");
1.401 + }
1.402 + }
1.403 + // We can't check this anymore. With lazy deopt we could have already
1.404 + // cleaned this IC entry before we even return. This is possible if
1.405 + // we ran out of space in the inline cache buffer trying to do the
1.406 + // set_next and we safepointed to free up space. This is a benign
1.407 + // race because the IC entry was complete when we safepointed so
1.408 + // cleaning it immediately is harmless.
1.409 + // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
1.410 +}
1.411 +
1.412 +
1.413 +// is_optimized: Compiler has generated an optimized call (i.e., no inline
1.414 +// cache) static_bound: The call can be static bound (i.e, no need to use
1.415 +// inline cache)
1.416 +void CompiledIC::compute_monomorphic_entry(methodHandle method,
1.417 + KlassHandle receiver_klass,
1.418 + bool is_optimized,
1.419 + bool static_bound,
1.420 + CompiledICInfo& info,
1.421 + TRAPS) {
1.422 + nmethod* method_code = method->code();
1.423 + address entry = NULL;
1.424 + if (method_code != NULL && method_code->is_in_use()) {
1.425 + // Call to compiled code
1.426 + if (static_bound || is_optimized) {
1.427 + entry = method_code->verified_entry_point();
1.428 + } else {
1.429 + entry = method_code->entry_point();
1.430 + }
1.431 + }
1.432 + if (entry != NULL) {
1.433 + // Call to compiled code
1.434 + info.set_compiled_entry(entry, (static_bound || is_optimized) ? NULL : receiver_klass(), is_optimized);
1.435 + } else {
1.436 + // Note: the following problem exists with Compiler1:
1.437 + // - at compile time we may or may not know if the destination is final
1.438 + // - if we know that the destination is final, we will emit an optimized
1.439 + // virtual call (no inline cache), and need a Method* to make a call
1.440 + // to the interpreter
1.441 + // - if we do not know if the destination is final, we emit a standard
1.442 + // virtual call, and use CompiledICHolder to call interpreted code
1.443 + // (no static call stub has been generated)
1.444 + // However in that case we will now notice it is static_bound
1.445 + // and convert the call into what looks to be an optimized
1.446 + // virtual call. This causes problems in verifying the IC because
1.447 + // it look vanilla but is optimized. Code in is_call_to_interpreted
1.448 + // is aware of this and weakens its asserts.
1.449 +
1.450 + // static_bound should imply is_optimized -- otherwise we have a
1.451 + // performance bug (statically-bindable method is called via
1.452 + // dynamically-dispatched call note: the reverse implication isn't
1.453 + // necessarily true -- the call may have been optimized based on compiler
1.454 + // analysis (static_bound is only based on "final" etc.)
1.455 +#ifdef COMPILER2
1.456 +#ifdef TIERED
1.457 +#if defined(ASSERT)
1.458 + // can't check the assert because we don't have the CompiledIC with which to
1.459 + // find the address if the call instruction.
1.460 + //
1.461 + // CodeBlob* cb = find_blob_unsafe(instruction_address());
1.462 + // assert(cb->is_compiled_by_c1() || !static_bound || is_optimized, "static_bound should imply is_optimized");
1.463 +#endif // ASSERT
1.464 +#else
1.465 + assert(!static_bound || is_optimized, "static_bound should imply is_optimized");
1.466 +#endif // TIERED
1.467 +#endif // COMPILER2
1.468 + if (is_optimized) {
1.469 + // Use stub entry
1.470 + info.set_interpreter_entry(method()->get_c2i_entry(), method());
1.471 + } else {
1.472 + // Use icholder entry
1.473 + CompiledICHolder* holder = new CompiledICHolder(method(), receiver_klass());
1.474 + info.set_icholder_entry(method()->get_c2i_unverified_entry(), holder);
1.475 + }
1.476 + }
1.477 + assert(info.is_optimized() == is_optimized, "must agree");
1.478 +}
1.479 +
1.480 +
1.481 +bool CompiledIC::is_icholder_entry(address entry) {
1.482 + CodeBlob* cb = CodeCache::find_blob_unsafe(entry);
1.483 + return (cb != NULL && cb->is_adapter_blob());
1.484 +}
1.485 +
1.486 +// ----------------------------------------------------------------------------
1.487 +
1.488 +void CompiledStaticCall::set_to_clean() {
1.489 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
1.490 + // Reset call site
1.491 + MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1.492 +#ifdef ASSERT
1.493 + CodeBlob* cb = CodeCache::find_blob_unsafe(this);
1.494 + assert(cb != NULL && cb->is_nmethod(), "must be nmethod");
1.495 +#endif
1.496 + set_destination_mt_safe(SharedRuntime::get_resolve_static_call_stub());
1.497 +
1.498 + // Do not reset stub here: It is too expensive to call find_stub.
1.499 + // Instead, rely on caller (nmethod::clear_inline_caches) to clear
1.500 + // both the call and its stub.
1.501 +}
1.502 +
1.503 +
1.504 +bool CompiledStaticCall::is_clean() const {
1.505 + return destination() == SharedRuntime::get_resolve_static_call_stub();
1.506 +}
1.507 +
1.508 +bool CompiledStaticCall::is_call_to_compiled() const {
1.509 + return CodeCache::contains(destination());
1.510 +}
1.511 +
1.512 +
1.513 +bool CompiledStaticCall::is_call_to_interpreted() const {
1.514 + // It is a call to interpreted, if it calls to a stub. Hence, the destination
1.515 + // must be in the stub part of the nmethod that contains the call
1.516 + nmethod* nm = CodeCache::find_nmethod(instruction_address());
1.517 + return nm->stub_contains(destination());
1.518 +}
1.519 +
1.520 +void CompiledStaticCall::set(const StaticCallInfo& info) {
1.521 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
1.522 + MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1.523 + // Updating a cache to the wrong entry can cause bugs that are very hard
1.524 + // to track down - if cache entry gets invalid - we just clean it. In
1.525 + // this way it is always the same code path that is responsible for
1.526 + // updating and resolving an inline cache
1.527 + assert(is_clean(), "do not update a call entry - use clean");
1.528 +
1.529 + if (info._to_interpreter) {
1.530 + // Call to interpreted code
1.531 + set_to_interpreted(info.callee(), info.entry());
1.532 + } else {
1.533 + if (TraceICs) {
1.534 + ResourceMark rm;
1.535 + tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT,
1.536 + p2i(instruction_address()),
1.537 + p2i(info.entry()));
1.538 + }
1.539 + // Call to compiled code
1.540 + assert (CodeCache::contains(info.entry()), "wrong entry point");
1.541 + set_destination_mt_safe(info.entry());
1.542 + }
1.543 +}
1.544 +
1.545 +
1.546 +// Compute settings for a CompiledStaticCall. Since we might have to set
1.547 +// the stub when calling to the interpreter, we need to return arguments.
1.548 +void CompiledStaticCall::compute_entry(methodHandle m, StaticCallInfo& info) {
1.549 + nmethod* m_code = m->code();
1.550 + info._callee = m;
1.551 + if (m_code != NULL && m_code->is_in_use()) {
1.552 + info._to_interpreter = false;
1.553 + info._entry = m_code->verified_entry_point();
1.554 + } else {
1.555 + // Callee is interpreted code. In any case entering the interpreter
1.556 + // puts a converter-frame on the stack to save arguments.
1.557 + info._to_interpreter = true;
1.558 + info._entry = m()->get_c2i_entry();
1.559 + }
1.560 +}
1.561 +
1.562 +address CompiledStaticCall::find_stub() {
1.563 + // Find reloc. information containing this call-site
1.564 + RelocIterator iter((nmethod*)NULL, instruction_address());
1.565 + while (iter.next()) {
1.566 + if (iter.addr() == instruction_address()) {
1.567 + switch(iter.type()) {
1.568 + case relocInfo::static_call_type:
1.569 + return iter.static_call_reloc()->static_stub();
1.570 + // We check here for opt_virtual_call_type, since we reuse the code
1.571 + // from the CompiledIC implementation
1.572 + case relocInfo::opt_virtual_call_type:
1.573 + return iter.opt_virtual_call_reloc()->static_stub();
1.574 + case relocInfo::poll_type:
1.575 + case relocInfo::poll_return_type: // A safepoint can't overlap a call.
1.576 + default:
1.577 + ShouldNotReachHere();
1.578 + }
1.579 + }
1.580 + }
1.581 + return NULL;
1.582 +}
1.583 +
1.584 +
1.585 +//-----------------------------------------------------------------------------
1.586 +// Non-product mode code
1.587 +#ifndef PRODUCT
1.588 +
1.589 +void CompiledIC::verify() {
1.590 + // make sure code pattern is actually a call imm32 instruction
1.591 + _ic_call->verify();
1.592 + if (os::is_MP()) {
1.593 + _ic_call->verify_alignment();
1.594 + }
1.595 + assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted()
1.596 + || is_optimized() || is_megamorphic(), "sanity check");
1.597 +}
1.598 +
1.599 +void CompiledIC::print() {
1.600 + print_compiled_ic();
1.601 + tty->cr();
1.602 +}
1.603 +
1.604 +void CompiledIC::print_compiled_ic() {
1.605 + tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT,
1.606 + p2i(instruction_address()), is_call_to_interpreted() ? "interpreted " : "", p2i(ic_destination()), p2i(is_optimized() ? NULL : cached_value()));
1.607 +}
1.608 +
1.609 +void CompiledStaticCall::print() {
1.610 + tty->print("static call at " INTPTR_FORMAT " -> ", p2i(instruction_address()));
1.611 + if (is_clean()) {
1.612 + tty->print("clean");
1.613 + } else if (is_call_to_compiled()) {
1.614 + tty->print("compiled");
1.615 + } else if (is_call_to_interpreted()) {
1.616 + tty->print("interpreted");
1.617 + }
1.618 + tty->cr();
1.619 +}
1.620 +
1.621 +#endif // !PRODUCT
