1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/code/compiledIC.cpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,662 @@
1.4 +/*
1.5 + * Copyright 1997-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "incls/_precompiled.incl"
1.29 +#include "incls/_compiledIC.cpp.incl"
1.30 +
1.31 +
1.32 +// Every time a compiled IC is changed or its type is being accessed,
1.33 +// either the CompiledIC_lock must be set or we must be at a safe point.
1.34 +
1.35 +//-----------------------------------------------------------------------------
1.36 +// Low-level access to an inline cache. Private, since they might not be
1.37 +// MT-safe to use.
1.38 +
1.39 +void CompiledIC::set_cached_oop(oop cache) {
1.40 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.41 + assert (!is_optimized(), "an optimized virtual call does not have a cached oop");
1.42 + assert (cache == NULL || cache != badOop, "invalid oop");
1.43 +
1.44 + if (TraceCompiledIC) {
1.45 + tty->print(" ");
1.46 + print_compiled_ic();
1.47 + tty->print_cr(" changing oop to " INTPTR_FORMAT, (address)cache);
1.48 + }
1.49 +
1.50 + if (cache == NULL) cache = (oop)Universe::non_oop_word();
1.51 +
1.52 + *_oop_addr = cache;
1.53 + // fix up the relocations
1.54 + RelocIterator iter = _oops;
1.55 + while (iter.next()) {
1.56 + if (iter.type() == relocInfo::oop_type) {
1.57 + oop_Relocation* r = iter.oop_reloc();
1.58 + if (r->oop_addr() == _oop_addr)
1.59 + r->fix_oop_relocation();
1.60 + }
1.61 + }
1.62 + return;
1.63 +}
1.64 +
1.65 +
1.66 +oop CompiledIC::cached_oop() const {
1.67 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.68 + assert (!is_optimized(), "an optimized virtual call does not have a cached oop");
1.69 +
1.70 + if (!is_in_transition_state()) {
1.71 + oop data = *_oop_addr;
1.72 + // If we let the oop value here be initialized to zero...
1.73 + assert(data != NULL || Universe::non_oop_word() == NULL,
1.74 + "no raw nulls in CompiledIC oops, because of patching races");
1.75 + return (data == (oop)Universe::non_oop_word()) ? (oop)NULL : data;
1.76 + } else {
1.77 + return InlineCacheBuffer::cached_oop_for((CompiledIC *)this);
1.78 + }
1.79 +}
1.80 +
1.81 +
1.82 +void CompiledIC::set_ic_destination(address entry_point) {
1.83 + assert(entry_point != NULL, "must set legal entry point");
1.84 + assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.85 + if (TraceCompiledIC) {
1.86 + tty->print(" ");
1.87 + print_compiled_ic();
1.88 + tty->print_cr(" changing destination to " INTPTR_FORMAT, entry_point);
1.89 + }
1.90 + MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1.91 +#ifdef ASSERT
1.92 + CodeBlob* cb = CodeCache::find_blob_unsafe(_ic_call);
1.93 + assert(cb != NULL && cb->is_nmethod(), "must be nmethod");
1.94 +#endif
1.95 + _ic_call->set_destination_mt_safe(entry_point);
1.96 +}
1.97 +
1.98 +
1.99 +address CompiledIC::ic_destination() const {
1.100 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.101 + if (!is_in_transition_state()) {
1.102 + return _ic_call->destination();
1.103 + } else {
1.104 + return InlineCacheBuffer::ic_destination_for((CompiledIC *)this);
1.105 + }
1.106 +}
1.107 +
1.108 +
1.109 +bool CompiledIC::is_in_transition_state() const {
1.110 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.111 + return InlineCacheBuffer::contains(_ic_call->destination());
1.112 +}
1.113 +
1.114 +
1.115 +// Returns native address of 'call' instruction in inline-cache. Used by
1.116 +// the InlineCacheBuffer when it needs to find the stub.
1.117 +address CompiledIC::stub_address() const {
1.118 + assert(is_in_transition_state(), "should only be called when we are in a transition state");
1.119 + return _ic_call->destination();
1.120 +}
1.121 +
1.122 +
1.123 +//-----------------------------------------------------------------------------
1.124 +// High-level access to an inline cache. Guaranteed to be MT-safe.
1.125 +
1.126 +
1.127 +void CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) {
1.128 + methodHandle method = call_info->selected_method();
1.129 + bool is_invoke_interface = (bytecode == Bytecodes::_invokeinterface && !call_info->has_vtable_index());
1.130 + assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.131 + assert(method->is_oop(), "cannot be NULL and must be oop");
1.132 + assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic");
1.133 + assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?");
1.134 +
1.135 + address entry;
1.136 + if (is_invoke_interface) {
1.137 + int index = klassItable::compute_itable_index(call_info->resolved_method()());
1.138 + entry = VtableStubs::create_stub(false, index, method());
1.139 + assert(entry != NULL, "entry not computed");
1.140 + klassOop k = call_info->resolved_method()->method_holder();
1.141 + assert(Klass::cast(k)->is_interface(), "sanity check");
1.142 + InlineCacheBuffer::create_transition_stub(this, k, entry);
1.143 + } else {
1.144 + // Can be different than method->vtable_index(), due to package-private etc.
1.145 + int vtable_index = call_info->vtable_index();
1.146 + entry = VtableStubs::create_stub(true, vtable_index, method());
1.147 + InlineCacheBuffer::create_transition_stub(this, method(), entry);
1.148 + }
1.149 +
1.150 + if (TraceICs) {
1.151 + ResourceMark rm;
1.152 + tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT,
1.153 + instruction_address(), method->print_value_string(), entry);
1.154 + }
1.155 +
1.156 + Events::log("compiledIC " INTPTR_FORMAT " --> megamorphic " INTPTR_FORMAT, this, (address)method());
1.157 + // We can't check this anymore. With lazy deopt we could have already
1.158 + // cleaned this IC entry before we even return. This is possible if
1.159 + // we ran out of space in the inline cache buffer trying to do the
1.160 + // set_next and we safepointed to free up space. This is a benign
1.161 + // race because the IC entry was complete when we safepointed so
1.162 + // cleaning it immediately is harmless.
1.163 + // assert(is_megamorphic(), "sanity check");
1.164 +}
1.165 +
1.166 +
1.167 +// true if destination is megamorphic stub
1.168 +bool CompiledIC::is_megamorphic() const {
1.169 + assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.170 + assert(!is_optimized(), "an optimized call cannot be megamorphic");
1.171 +
1.172 + // Cannot rely on cached_oop. It is either an interface or a method.
1.173 + return VtableStubs::is_entry_point(ic_destination());
1.174 +}
1.175 +
1.176 +bool CompiledIC::is_call_to_compiled() const {
1.177 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.178 +
1.179 + // Use unsafe, since an inline cache might point to a zombie method. However, the zombie
1.180 + // method is guaranteed to still exist, since we only remove methods after all inline caches
1.181 + // has been cleaned up
1.182 + CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
1.183 + bool is_monomorphic = (cb != NULL && cb->is_nmethod());
1.184 + // Check that the cached_oop is a klass for non-optimized monomorphic calls
1.185 + // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used
1.186 + // for calling directly to vep without using the inline cache (i.e., cached_oop == NULL)
1.187 +#ifdef ASSERT
1.188 +#ifdef TIERED
1.189 + CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address());
1.190 + bool is_c1_method = caller->is_compiled_by_c1();
1.191 +#else
1.192 +#ifdef COMPILER1
1.193 + bool is_c1_method = true;
1.194 +#else
1.195 + bool is_c1_method = false;
1.196 +#endif // COMPILER1
1.197 +#endif // TIERED
1.198 + assert( is_c1_method ||
1.199 + !is_monomorphic ||
1.200 + is_optimized() ||
1.201 + (cached_oop() != NULL && cached_oop()->is_klass()), "sanity check");
1.202 +#endif // ASSERT
1.203 + return is_monomorphic;
1.204 +}
1.205 +
1.206 +
1.207 +bool CompiledIC::is_call_to_interpreted() const {
1.208 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.209 + // Call to interpreter if destination is either calling to a stub (if it
1.210 + // is optimized), or calling to an I2C blob
1.211 + bool is_call_to_interpreted = false;
1.212 + if (!is_optimized()) {
1.213 + // must use unsafe because the destination can be a zombie (and we're cleaning)
1.214 + // and the print_compiled_ic code wants to know if site (in the non-zombie)
1.215 + // is to the interpreter.
1.216 + CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
1.217 + is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob());
1.218 + assert(!is_call_to_interpreted || (cached_oop() != NULL && cached_oop()->is_compiledICHolder()), "sanity check");
1.219 + } else {
1.220 + // Check if we are calling into our own codeblob (i.e., to a stub)
1.221 + CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address());
1.222 + address dest = ic_destination();
1.223 +#ifdef ASSERT
1.224 + {
1.225 + CodeBlob* db = CodeCache::find_blob_unsafe(dest);
1.226 + assert(!db->is_adapter_blob(), "must use stub!");
1.227 + }
1.228 +#endif /* ASSERT */
1.229 + is_call_to_interpreted = cb->contains(dest);
1.230 + }
1.231 + return is_call_to_interpreted;
1.232 +}
1.233 +
1.234 +
1.235 +void CompiledIC::set_to_clean() {
1.236 + assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call");
1.237 + if (TraceInlineCacheClearing || TraceICs) {
1.238 + tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", instruction_address());
1.239 + print();
1.240 + }
1.241 +
1.242 + address entry;
1.243 + if (is_optimized()) {
1.244 + entry = SharedRuntime::get_resolve_opt_virtual_call_stub();
1.245 + } else {
1.246 + entry = SharedRuntime::get_resolve_virtual_call_stub();
1.247 + }
1.248 +
1.249 + // A zombie transition will always be safe, since the oop has already been set to NULL, so
1.250 + // we only need to patch the destination
1.251 + bool safe_transition = is_optimized() || SafepointSynchronize::is_at_safepoint();
1.252 +
1.253 + if (safe_transition) {
1.254 + if (!is_optimized()) set_cached_oop(NULL);
1.255 + // Kill any leftover stub we might have too
1.256 + if (is_in_transition_state()) {
1.257 + ICStub* old_stub = ICStub_from_destination_address(stub_address());
1.258 + old_stub->clear();
1.259 + }
1.260 + set_ic_destination(entry);
1.261 + } else {
1.262 + // Unsafe transition - create stub.
1.263 + InlineCacheBuffer::create_transition_stub(this, NULL, entry);
1.264 + }
1.265 + // We can't check this anymore. With lazy deopt we could have already
1.266 + // cleaned this IC entry before we even return. This is possible if
1.267 + // we ran out of space in the inline cache buffer trying to do the
1.268 + // set_next and we safepointed to free up space. This is a benign
1.269 + // race because the IC entry was complete when we safepointed so
1.270 + // cleaning it immediately is harmless.
1.271 + // assert(is_clean(), "sanity check");
1.272 +}
1.273 +
1.274 +
1.275 +bool CompiledIC::is_clean() const {
1.276 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.277 + bool is_clean = false;
1.278 + address dest = ic_destination();
1.279 + is_clean = dest == SharedRuntime::get_resolve_opt_virtual_call_stub() ||
1.280 + dest == SharedRuntime::get_resolve_virtual_call_stub();
1.281 + assert(!is_clean || is_optimized() || cached_oop() == NULL, "sanity check");
1.282 + return is_clean;
1.283 +}
1.284 +
1.285 +
1.286 +void CompiledIC::set_to_monomorphic(const CompiledICInfo& info) {
1.287 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
1.288 + // Updating a cache to the wrong entry can cause bugs that are very hard
1.289 + // to track down - if cache entry gets invalid - we just clean it. In
1.290 + // this way it is always the same code path that is responsible for
1.291 + // updating and resolving an inline cache
1.292 + //
1.293 + // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized
1.294 + // callsites. In addition ic_miss code will update a site to monomorphic if it determines
1.295 + // that an monomorphic call to the interpreter can now be monomorphic to compiled code.
1.296 + //
1.297 + // In both of these cases the only thing being modifed is the jump/call target and these
1.298 + // transitions are mt_safe
1.299 +
1.300 + Thread *thread = Thread::current();
1.301 + if (info._to_interpreter) {
1.302 + // Call to interpreter
1.303 + if (info.is_optimized() && is_optimized()) {
1.304 + assert(is_clean(), "unsafe IC path");
1.305 + MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1.306 + // the call analysis (callee structure) specifies that the call is optimized
1.307 + // (either because of CHA or the static target is final)
1.308 + // At code generation time, this call has been emitted as static call
1.309 + // Call via stub
1.310 + assert(info.cached_oop().not_null() && info.cached_oop()->is_method(), "sanity check");
1.311 + CompiledStaticCall* csc = compiledStaticCall_at(instruction_address());
1.312 + methodHandle method (thread, (methodOop)info.cached_oop()());
1.313 + csc->set_to_interpreted(method, info.entry());
1.314 + if (TraceICs) {
1.315 + ResourceMark rm(thread);
1.316 + tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter: %s",
1.317 + instruction_address(),
1.318 + method->print_value_string());
1.319 + }
1.320 + } else {
1.321 + // Call via method-klass-holder
1.322 + assert(info.cached_oop().not_null(), "must be set");
1.323 + InlineCacheBuffer::create_transition_stub(this, info.cached_oop()(), info.entry());
1.324 +
1.325 + if (TraceICs) {
1.326 + ResourceMark rm(thread);
1.327 + tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via mkh", instruction_address());
1.328 + }
1.329 + }
1.330 + } else {
1.331 + // Call to compiled code
1.332 + bool static_bound = info.is_optimized() || (info.cached_oop().is_null());
1.333 +#ifdef ASSERT
1.334 + CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry());
1.335 + assert (cb->is_nmethod(), "must be compiled!");
1.336 +#endif /* ASSERT */
1.337 +
1.338 + // This is MT safe if we come from a clean-cache and go through a
1.339 + // non-verified entry point
1.340 + bool safe = SafepointSynchronize::is_at_safepoint() ||
1.341 + (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean()));
1.342 +
1.343 + if (!safe) {
1.344 + InlineCacheBuffer::create_transition_stub(this, info.cached_oop()(), info.entry());
1.345 + } else {
1.346 + set_ic_destination(info.entry());
1.347 + if (!is_optimized()) set_cached_oop(info.cached_oop()());
1.348 + }
1.349 +
1.350 + if (TraceICs) {
1.351 + ResourceMark rm(thread);
1.352 + assert(info.cached_oop() == NULL || info.cached_oop()()->is_klass(), "must be");
1.353 + tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s",
1.354 + instruction_address(),
1.355 + ((klassOop)info.cached_oop()())->print_value_string(),
1.356 + (safe) ? "" : "via stub");
1.357 + }
1.358 + }
1.359 + // We can't check this anymore. With lazy deopt we could have already
1.360 + // cleaned this IC entry before we even return. This is possible if
1.361 + // we ran out of space in the inline cache buffer trying to do the
1.362 + // set_next and we safepointed to free up space. This is a benign
1.363 + // race because the IC entry was complete when we safepointed so
1.364 + // cleaning it immediately is harmless.
1.365 + // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
1.366 +}
1.367 +
1.368 +
1.369 +// is_optimized: Compiler has generated an optimized call (i.e., no inline
1.370 +// cache) static_bound: The call can be static bound (i.e, no need to use
1.371 +// inline cache)
1.372 +void CompiledIC::compute_monomorphic_entry(methodHandle method,
1.373 + KlassHandle receiver_klass,
1.374 + bool is_optimized,
1.375 + bool static_bound,
1.376 + CompiledICInfo& info,
1.377 + TRAPS) {
1.378 + info._is_optimized = is_optimized;
1.379 +
1.380 + nmethod* method_code = method->code();
1.381 + address entry = NULL;
1.382 + if (method_code != NULL) {
1.383 + // Call to compiled code
1.384 + if (static_bound || is_optimized) {
1.385 + entry = method_code->verified_entry_point();
1.386 + } else {
1.387 + entry = method_code->entry_point();
1.388 + }
1.389 + }
1.390 + if (entry != NULL) {
1.391 + // Call to compiled code
1.392 + info._entry = entry;
1.393 + if (static_bound || is_optimized) {
1.394 + info._cached_oop = Handle(THREAD, (oop)NULL);
1.395 + } else {
1.396 + info._cached_oop = receiver_klass;
1.397 + }
1.398 + info._to_interpreter = false;
1.399 + } else {
1.400 + // Note: the following problem exists with Compiler1:
1.401 + // - at compile time we may or may not know if the destination is final
1.402 + // - if we know that the destination is final, we will emit an optimized
1.403 + // virtual call (no inline cache), and need a methodOop to make a call
1.404 + // to the interpreter
1.405 + // - if we do not know if the destination is final, we emit a standard
1.406 + // virtual call, and use CompiledICHolder to call interpreted code
1.407 + // (no static call stub has been generated)
1.408 + // However in that case we will now notice it is static_bound
1.409 + // and convert the call into what looks to be an optimized
1.410 + // virtual call. This causes problems in verifying the IC because
1.411 + // it look vanilla but is optimized. Code in is_call_to_interpreted
1.412 + // is aware of this and weakens its asserts.
1.413 +
1.414 + info._to_interpreter = true;
1.415 + // static_bound should imply is_optimized -- otherwise we have a
1.416 + // performance bug (statically-bindable method is called via
1.417 + // dynamically-dispatched call note: the reverse implication isn't
1.418 + // necessarily true -- the call may have been optimized based on compiler
1.419 + // analysis (static_bound is only based on "final" etc.)
1.420 +#ifdef COMPILER2
1.421 +#ifdef TIERED
1.422 +#if defined(ASSERT)
1.423 + // can't check the assert because we don't have the CompiledIC with which to
1.424 + // find the address if the call instruction.
1.425 + //
1.426 + // CodeBlob* cb = find_blob_unsafe(instruction_address());
1.427 + // assert(cb->is_compiled_by_c1() || !static_bound || is_optimized, "static_bound should imply is_optimized");
1.428 +#endif // ASSERT
1.429 +#else
1.430 + assert(!static_bound || is_optimized, "static_bound should imply is_optimized");
1.431 +#endif // TIERED
1.432 +#endif // COMPILER2
1.433 + if (is_optimized) {
1.434 + // Use stub entry
1.435 + info._entry = method()->get_c2i_entry();
1.436 + info._cached_oop = method;
1.437 + } else {
1.438 + // Use mkh entry
1.439 + oop holder = oopFactory::new_compiledICHolder(method, receiver_klass, CHECK);
1.440 + info._cached_oop = Handle(THREAD, holder);
1.441 + info._entry = method()->get_c2i_unverified_entry();
1.442 + }
1.443 + }
1.444 +}
1.445 +
1.446 +
1.447 +inline static RelocIterator parse_ic(CodeBlob* code, address ic_call, oop* &_oop_addr, bool *is_optimized) {
1.448 + address first_oop = NULL;
1.449 + // Mergers please note: Sun SC5.x CC insists on an lvalue for a reference parameter.
1.450 + CodeBlob *code1 = code;
1.451 + return virtual_call_Relocation::parse_ic(code1, ic_call, first_oop, _oop_addr, is_optimized);
1.452 +}
1.453 +
1.454 +CompiledIC::CompiledIC(NativeCall* ic_call)
1.455 + : _ic_call(ic_call),
1.456 + _oops(parse_ic(NULL, ic_call->instruction_address(), _oop_addr, &_is_optimized))
1.457 +{
1.458 +}
1.459 +
1.460 +
1.461 +CompiledIC::CompiledIC(Relocation* ic_reloc)
1.462 + : _ic_call(nativeCall_at(ic_reloc->addr())),
1.463 + _oops(parse_ic(ic_reloc->code(), ic_reloc->addr(), _oop_addr, &_is_optimized))
1.464 +{
1.465 + assert(ic_reloc->type() == relocInfo::virtual_call_type ||
1.466 + ic_reloc->type() == relocInfo::opt_virtual_call_type, "wrong reloc. info");
1.467 +}
1.468 +
1.469 +
1.470 +// ----------------------------------------------------------------------------
1.471 +
1.472 +void CompiledStaticCall::set_to_clean() {
1.473 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
1.474 + // Reset call site
1.475 + MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1.476 +#ifdef ASSERT
1.477 + CodeBlob* cb = CodeCache::find_blob_unsafe(this);
1.478 + assert(cb != NULL && cb->is_nmethod(), "must be nmethod");
1.479 +#endif
1.480 + set_destination_mt_safe(SharedRuntime::get_resolve_static_call_stub());
1.481 +
1.482 + // Do not reset stub here: It is too expensive to call find_stub.
1.483 + // Instead, rely on caller (nmethod::clear_inline_caches) to clear
1.484 + // both the call and its stub.
1.485 +}
1.486 +
1.487 +
1.488 +bool CompiledStaticCall::is_clean() const {
1.489 + return destination() == SharedRuntime::get_resolve_static_call_stub();
1.490 +}
1.491 +
1.492 +bool CompiledStaticCall::is_call_to_compiled() const {
1.493 + return CodeCache::contains(destination());
1.494 +}
1.495 +
1.496 +
1.497 +bool CompiledStaticCall::is_call_to_interpreted() const {
1.498 + // It is a call to interpreted, if it calls to a stub. Hence, the destination
1.499 + // must be in the stub part of the nmethod that contains the call
1.500 + nmethod* nm = CodeCache::find_nmethod(instruction_address());
1.501 + return nm->stub_contains(destination());
1.502 +}
1.503 +
1.504 +
1.505 +void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) {
1.506 + address stub=find_stub();
1.507 + assert(stub!=NULL, "stub not found");
1.508 +
1.509 + if (TraceICs) {
1.510 + ResourceMark rm;
1.511 + tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s",
1.512 + instruction_address(),
1.513 + callee->name_and_sig_as_C_string());
1.514 + }
1.515 +
1.516 + NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object
1.517 + NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
1.518 +
1.519 + assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(), "a) MT-unsafe modification of inline cache");
1.520 + assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry, "b) MT-unsafe modification of inline cache");
1.521 +
1.522 + // Update stub
1.523 + method_holder->set_data((intptr_t)callee());
1.524 + jump->set_jump_destination(entry);
1.525 +
1.526 + // Update jump to call
1.527 + set_destination_mt_safe(stub);
1.528 +}
1.529 +
1.530 +
1.531 +void CompiledStaticCall::set(const StaticCallInfo& info) {
1.532 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
1.533 + MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1.534 + // Updating a cache to the wrong entry can cause bugs that are very hard
1.535 + // to track down - if cache entry gets invalid - we just clean it. In
1.536 + // this way it is always the same code path that is responsible for
1.537 + // updating and resolving an inline cache
1.538 + assert(is_clean(), "do not update a call entry - use clean");
1.539 +
1.540 + if (info._to_interpreter) {
1.541 + // Call to interpreted code
1.542 + set_to_interpreted(info.callee(), info.entry());
1.543 + } else {
1.544 + if (TraceICs) {
1.545 + ResourceMark rm;
1.546 + tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT,
1.547 + instruction_address(),
1.548 + info.entry());
1.549 + }
1.550 + // Call to compiled code
1.551 + assert (CodeCache::contains(info.entry()), "wrong entry point");
1.552 + set_destination_mt_safe(info.entry());
1.553 + }
1.554 +}
1.555 +
1.556 +
1.557 +// Compute settings for a CompiledStaticCall. Since we might have to set
1.558 +// the stub when calling to the interpreter, we need to return arguments.
1.559 +void CompiledStaticCall::compute_entry(methodHandle m, StaticCallInfo& info) {
1.560 + nmethod* m_code = m->code();
1.561 + info._callee = m;
1.562 + if (m_code != NULL) {
1.563 + info._to_interpreter = false;
1.564 + info._entry = m_code->verified_entry_point();
1.565 + } else {
1.566 + // Callee is interpreted code. In any case entering the interpreter
1.567 + // puts a converter-frame on the stack to save arguments.
1.568 + info._to_interpreter = true;
1.569 + info._entry = m()->get_c2i_entry();
1.570 + }
1.571 +}
1.572 +
1.573 +
1.574 +void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) {
1.575 + assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
1.576 + // Reset stub
1.577 + address stub = static_stub->addr();
1.578 + assert(stub!=NULL, "stub not found");
1.579 + NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object
1.580 + NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
1.581 + method_holder->set_data(0);
1.582 + jump->set_jump_destination((address)-1);
1.583 +}
1.584 +
1.585 +
1.586 +address CompiledStaticCall::find_stub() {
1.587 + // Find reloc. information containing this call-site
1.588 + RelocIterator iter((nmethod*)NULL, instruction_address());
1.589 + while (iter.next()) {
1.590 + if (iter.addr() == instruction_address()) {
1.591 + switch(iter.type()) {
1.592 + case relocInfo::static_call_type:
1.593 + return iter.static_call_reloc()->static_stub();
1.594 + // We check here for opt_virtual_call_type, since we reuse the code
1.595 + // from the CompiledIC implementation
1.596 + case relocInfo::opt_virtual_call_type:
1.597 + return iter.opt_virtual_call_reloc()->static_stub();
1.598 + case relocInfo::poll_type:
1.599 + case relocInfo::poll_return_type: // A safepoint can't overlap a call.
1.600 + default:
1.601 + ShouldNotReachHere();
1.602 + }
1.603 + }
1.604 + }
1.605 + return NULL;
1.606 +}
1.607 +
1.608 +
1.609 +//-----------------------------------------------------------------------------
1.610 +// Non-product mode code
1.611 +#ifndef PRODUCT
1.612 +
1.613 +void CompiledIC::verify() {
1.614 + // make sure code pattern is actually a call imm32 instruction
1.615 + _ic_call->verify();
1.616 + if (os::is_MP()) {
1.617 + _ic_call->verify_alignment();
1.618 + }
1.619 + assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted()
1.620 + || is_optimized() || is_megamorphic(), "sanity check");
1.621 +}
1.622 +
1.623 +
1.624 +void CompiledIC::print() {
1.625 + print_compiled_ic();
1.626 + tty->cr();
1.627 +}
1.628 +
1.629 +
1.630 +void CompiledIC::print_compiled_ic() {
1.631 + tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT,
1.632 + instruction_address(), is_call_to_interpreted() ? "interpreted " : "", ic_destination());
1.633 +}
1.634 +
1.635 +
1.636 +void CompiledStaticCall::print() {
1.637 + tty->print("static call at " INTPTR_FORMAT " -> ", instruction_address());
1.638 + if (is_clean()) {
1.639 + tty->print("clean");
1.640 + } else if (is_call_to_compiled()) {
1.641 + tty->print("compiled");
1.642 + } else if (is_call_to_interpreted()) {
1.643 + tty->print("interpreted");
1.644 + }
1.645 + tty->cr();
1.646 +}
1.647 +
1.648 +void CompiledStaticCall::verify() {
1.649 + // Verify call
1.650 + NativeCall::verify();
1.651 + if (os::is_MP()) {
1.652 + verify_alignment();
1.653 + }
1.654 +
1.655 + // Verify stub
1.656 + address stub = find_stub();
1.657 + assert(stub != NULL, "no stub found for static call");
1.658 + NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object
1.659 + NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
1.660 +
1.661 + // Verify state
1.662 + assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
1.663 +}
1.664 +
1.665 +#endif
