Wed, 27 Nov 2013 16:16:21 -0800
8029015: PPC64 (part 216): opto: trap based null and range checks
Summary: On PPC64 use tdi instruction that does a compare and raises SIGTRAP for NULL and range checks.
Reviewed-by: kvn
aoqi@0 | 1 | /* |
aoqi@0 | 2 | * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
aoqi@0 | 4 | * |
aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
aoqi@0 | 7 | * published by the Free Software Foundation. |
aoqi@0 | 8 | * |
aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
aoqi@0 | 13 | * accompanied this code). |
aoqi@0 | 14 | * |
aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
aoqi@0 | 18 | * |
aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
aoqi@0 | 21 | * questions. |
aoqi@0 | 22 | * |
aoqi@0 | 23 | */ |
aoqi@0 | 24 | |
aoqi@0 | 25 | #include "precompiled.hpp" |
aoqi@0 | 26 | #include "asm/macroAssembler.inline.hpp" |
aoqi@0 | 27 | #include "code/compiledIC.hpp" |
aoqi@0 | 28 | #include "code/icBuffer.hpp" |
aoqi@0 | 29 | #include "code/nmethod.hpp" |
aoqi@0 | 30 | #include "memory/resourceArea.hpp" |
aoqi@0 | 31 | #include "runtime/mutexLocker.hpp" |
aoqi@0 | 32 | #include "runtime/safepoint.hpp" |
aoqi@0 | 33 | #ifdef COMPILER2 |
aoqi@0 | 34 | #include "opto/matcher.hpp" |
aoqi@0 | 35 | #endif |
aoqi@0 | 36 | |
aoqi@0 | 37 | // Release the CompiledICHolder* associated with this call site is there is one. |
aoqi@0 | 38 | void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site) { |
aoqi@0 | 39 | // This call site might have become stale so inspect it carefully. |
aoqi@0 | 40 | NativeCall* call = nativeCall_at(call_site->addr()); |
aoqi@0 | 41 | if (is_icholder_entry(call->destination())) { |
aoqi@0 | 42 | NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value()); |
aoqi@0 | 43 | InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data()); |
aoqi@0 | 44 | } |
aoqi@0 | 45 | } |
aoqi@0 | 46 | |
aoqi@0 | 47 | bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site) { |
aoqi@0 | 48 | // This call site might have become stale so inspect it carefully. |
aoqi@0 | 49 | NativeCall* call = nativeCall_at(call_site->addr()); |
aoqi@0 | 50 | return is_icholder_entry(call->destination()); |
aoqi@0 | 51 | } |
aoqi@0 | 52 | |
aoqi@0 | 53 | //----------------------------------------------------------------------------- |
aoqi@0 | 54 | // High-level access to an inline cache. Guaranteed to be MT-safe. |
aoqi@0 | 55 | |
aoqi@0 | 56 | CompiledIC::CompiledIC(nmethod* nm, NativeCall* call) |
aoqi@0 | 57 | : _ic_call(call) |
aoqi@0 | 58 | { |
aoqi@0 | 59 | address ic_call = call->instruction_address(); |
aoqi@0 | 60 | |
aoqi@0 | 61 | assert(ic_call != NULL, "ic_call address must be set"); |
aoqi@0 | 62 | assert(nm != NULL, "must pass nmethod"); |
aoqi@0 | 63 | assert(nm->contains(ic_call), "must be in nmethod"); |
aoqi@0 | 64 | |
aoqi@0 | 65 | // Search for the ic_call at the given address. |
aoqi@0 | 66 | RelocIterator iter(nm, ic_call, ic_call+1); |
aoqi@0 | 67 | bool ret = iter.next(); |
aoqi@0 | 68 | assert(ret == true, "relocInfo must exist at this address"); |
aoqi@0 | 69 | assert(iter.addr() == ic_call, "must find ic_call"); |
aoqi@0 | 70 | if (iter.type() == relocInfo::virtual_call_type) { |
aoqi@0 | 71 | virtual_call_Relocation* r = iter.virtual_call_reloc(); |
aoqi@0 | 72 | _is_optimized = false; |
aoqi@0 | 73 | _value = nativeMovConstReg_at(r->cached_value()); |
aoqi@0 | 74 | } else { |
aoqi@0 | 75 | assert(iter.type() == relocInfo::opt_virtual_call_type, "must be a virtual call"); |
aoqi@0 | 76 | _is_optimized = true; |
aoqi@0 | 77 | _value = NULL; |
aoqi@0 | 78 | } |
aoqi@0 | 79 | } |
aoqi@0 | 80 | |
aoqi@0 | 81 | // ---------------------------------------------------------------------------- |
aoqi@0 | 82 | |
aoqi@0 | 83 | // A PPC CompiledStaticCall looks like this: |
aoqi@0 | 84 | // |
aoqi@0 | 85 | // >>>> consts |
aoqi@0 | 86 | // |
aoqi@0 | 87 | // [call target1] |
aoqi@0 | 88 | // [IC cache] |
aoqi@0 | 89 | // [call target2] |
aoqi@0 | 90 | // |
aoqi@0 | 91 | // <<<< consts |
aoqi@0 | 92 | // >>>> insts |
aoqi@0 | 93 | // |
aoqi@0 | 94 | // bl offset16 -+ -+ ??? // How many bits available? |
aoqi@0 | 95 | // | | |
aoqi@0 | 96 | // <<<< insts | | |
aoqi@0 | 97 | // >>>> stubs | | |
aoqi@0 | 98 | // | |- trampoline_stub_Reloc |
aoqi@0 | 99 | // trampoline stub: | <-+ |
aoqi@0 | 100 | // r2 = toc | |
aoqi@0 | 101 | // r2 = [r2 + offset] | // Load call target1 from const section |
aoqi@0 | 102 | // mtctr r2 | |
aoqi@0 | 103 | // bctr |- static_stub_Reloc |
aoqi@0 | 104 | // comp_to_interp_stub: <---+ |
aoqi@0 | 105 | // r1 = toc |
aoqi@0 | 106 | // ICreg = [r1 + IC_offset] // Load IC from const section |
aoqi@0 | 107 | // r1 = [r1 + offset] // Load call target2 from const section |
aoqi@0 | 108 | // mtctr r1 |
aoqi@0 | 109 | // bctr |
aoqi@0 | 110 | // |
aoqi@0 | 111 | // <<<< stubs |
aoqi@0 | 112 | // |
aoqi@0 | 113 | // The call instruction in the code either |
aoqi@0 | 114 | // - branches directly to a compiled method if offset encodable in instruction |
aoqi@0 | 115 | // - branches to the trampoline stub if offset to compiled method not encodable |
aoqi@0 | 116 | // - branches to the compiled_to_interp stub if target interpreted |
aoqi@0 | 117 | // |
aoqi@0 | 118 | // Further there are three relocations from the loads to the constants in |
aoqi@0 | 119 | // the constant section. |
aoqi@0 | 120 | // |
aoqi@0 | 121 | // Usage of r1 and r2 in the stubs allows to distinguish them. |
aoqi@0 | 122 | |
aoqi@0 | 123 | const int IC_pos_in_java_to_interp_stub = 8; |
aoqi@0 | 124 | #define __ _masm. |
aoqi@0 | 125 | void CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf) { |
aoqi@0 | 126 | #ifdef COMPILER2 |
aoqi@0 | 127 | // Get the mark within main instrs section which is set to the address of the call. |
aoqi@0 | 128 | address call_addr = cbuf.insts_mark(); |
aoqi@0 | 129 | |
aoqi@0 | 130 | // Note that the code buffer's insts_mark is always relative to insts. |
aoqi@0 | 131 | // That's why we must use the macroassembler to generate a stub. |
aoqi@0 | 132 | MacroAssembler _masm(&cbuf); |
aoqi@0 | 133 | |
aoqi@0 | 134 | // Start the stub. |
aoqi@0 | 135 | address stub = __ start_a_stub(CompiledStaticCall::to_interp_stub_size()); |
aoqi@0 | 136 | if (stub == NULL) { |
aoqi@0 | 137 | Compile::current()->env()->record_out_of_memory_failure(); |
aoqi@0 | 138 | return; |
aoqi@0 | 139 | } |
aoqi@0 | 140 | |
aoqi@0 | 141 | // For java_to_interp stubs we use R11_scratch1 as scratch register |
aoqi@0 | 142 | // and in call trampoline stubs we use R12_scratch2. This way we |
aoqi@0 | 143 | // can distinguish them (see is_NativeCallTrampolineStub_at()). |
aoqi@0 | 144 | Register reg_scratch = R11_scratch1; |
aoqi@0 | 145 | |
aoqi@0 | 146 | // Create a static stub relocation which relates this stub |
aoqi@0 | 147 | // with the call instruction at insts_call_instruction_offset in the |
aoqi@0 | 148 | // instructions code-section. |
aoqi@0 | 149 | __ relocate(static_stub_Relocation::spec(call_addr)); |
aoqi@0 | 150 | const int stub_start_offset = __ offset(); |
aoqi@0 | 151 | |
aoqi@0 | 152 | // Now, create the stub's code: |
aoqi@0 | 153 | // - load the TOC |
aoqi@0 | 154 | // - load the inline cache oop from the constant pool |
aoqi@0 | 155 | // - load the call target from the constant pool |
aoqi@0 | 156 | // - call |
aoqi@0 | 157 | __ calculate_address_from_global_toc(reg_scratch, __ method_toc()); |
aoqi@0 | 158 | AddressLiteral ic = __ allocate_metadata_address((Metadata *)NULL); |
aoqi@0 | 159 | __ load_const_from_method_toc(as_Register(Matcher::inline_cache_reg_encode()), ic, reg_scratch); |
aoqi@0 | 160 | |
aoqi@0 | 161 | if (ReoptimizeCallSequences) { |
aoqi@0 | 162 | __ b64_patchable((address)-1, relocInfo::none); |
aoqi@0 | 163 | } else { |
aoqi@0 | 164 | AddressLiteral a((address)-1); |
aoqi@0 | 165 | __ load_const_from_method_toc(reg_scratch, a, reg_scratch); |
aoqi@0 | 166 | __ mtctr(reg_scratch); |
aoqi@0 | 167 | __ bctr(); |
aoqi@0 | 168 | } |
aoqi@0 | 169 | |
aoqi@0 | 170 | // FIXME: Assert that the stub can be identified and patched. |
aoqi@0 | 171 | |
aoqi@0 | 172 | // Java_to_interp_stub_size should be good. |
aoqi@0 | 173 | assert((__ offset() - stub_start_offset) <= CompiledStaticCall::to_interp_stub_size(), |
aoqi@0 | 174 | "should be good size"); |
aoqi@0 | 175 | assert(!is_NativeCallTrampolineStub_at(__ addr_at(stub_start_offset)), |
aoqi@0 | 176 | "must not confuse java_to_interp with trampoline stubs"); |
aoqi@0 | 177 | |
aoqi@0 | 178 | // End the stub. |
aoqi@0 | 179 | __ end_a_stub(); |
aoqi@0 | 180 | #else |
aoqi@0 | 181 | ShouldNotReachHere(); |
aoqi@0 | 182 | #endif |
aoqi@0 | 183 | } |
aoqi@0 | 184 | #undef __ |
aoqi@0 | 185 | |
aoqi@0 | 186 | // Size of java_to_interp stub, this doesn't need to be accurate but it must |
aoqi@0 | 187 | // be larger or equal to the real size of the stub. |
aoqi@0 | 188 | // Used for optimization in Compile::Shorten_branches. |
aoqi@0 | 189 | int CompiledStaticCall::to_interp_stub_size() { |
aoqi@0 | 190 | return 12 * BytesPerInstWord; |
aoqi@0 | 191 | } |
aoqi@0 | 192 | |
aoqi@0 | 193 | // Relocation entries for call stub, compiled java to interpreter. |
aoqi@0 | 194 | // Used for optimization in Compile::Shorten_branches. |
aoqi@0 | 195 | int CompiledStaticCall::reloc_to_interp_stub() { |
aoqi@0 | 196 | return 5; |
aoqi@0 | 197 | } |
aoqi@0 | 198 | |
aoqi@0 | 199 | void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) { |
aoqi@0 | 200 | address stub = find_stub(); |
aoqi@0 | 201 | guarantee(stub != NULL, "stub not found"); |
aoqi@0 | 202 | |
aoqi@0 | 203 | if (TraceICs) { |
aoqi@0 | 204 | ResourceMark rm; |
aoqi@0 | 205 | tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s", |
aoqi@0 | 206 | instruction_address(), |
aoqi@0 | 207 | callee->name_and_sig_as_C_string()); |
aoqi@0 | 208 | } |
aoqi@0 | 209 | |
aoqi@0 | 210 | // Creation also verifies the object. |
aoqi@0 | 211 | NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + IC_pos_in_java_to_interp_stub); |
aoqi@0 | 212 | NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); |
aoqi@0 | 213 | |
aoqi@0 | 214 | assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(), |
aoqi@0 | 215 | "a) MT-unsafe modification of inline cache"); |
aoqi@0 | 216 | assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry, |
aoqi@0 | 217 | "b) MT-unsafe modification of inline cache"); |
aoqi@0 | 218 | |
aoqi@0 | 219 | // Update stub. |
aoqi@0 | 220 | method_holder->set_data((intptr_t)callee()); |
aoqi@0 | 221 | jump->set_jump_destination(entry); |
aoqi@0 | 222 | |
aoqi@0 | 223 | // Update jump to call. |
aoqi@0 | 224 | set_destination_mt_safe(stub); |
aoqi@0 | 225 | } |
aoqi@0 | 226 | |
aoqi@0 | 227 | void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) { |
aoqi@0 | 228 | assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); |
aoqi@0 | 229 | // Reset stub. |
aoqi@0 | 230 | address stub = static_stub->addr(); |
aoqi@0 | 231 | assert(stub != NULL, "stub not found"); |
aoqi@0 | 232 | // Creation also verifies the object. |
aoqi@0 | 233 | NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + IC_pos_in_java_to_interp_stub); |
aoqi@0 | 234 | NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); |
aoqi@0 | 235 | method_holder->set_data(0); |
aoqi@0 | 236 | jump->set_jump_destination((address)-1); |
aoqi@0 | 237 | } |
aoqi@0 | 238 | |
aoqi@0 | 239 | //----------------------------------------------------------------------------- |
aoqi@0 | 240 | // Non-product mode code |
aoqi@0 | 241 | #ifndef PRODUCT |
aoqi@0 | 242 | |
aoqi@0 | 243 | void CompiledStaticCall::verify() { |
aoqi@0 | 244 | // Verify call. |
aoqi@0 | 245 | NativeCall::verify(); |
aoqi@0 | 246 | if (os::is_MP()) { |
aoqi@0 | 247 | verify_alignment(); |
aoqi@0 | 248 | } |
aoqi@0 | 249 | |
aoqi@0 | 250 | // Verify stub. |
aoqi@0 | 251 | address stub = find_stub(); |
aoqi@0 | 252 | assert(stub != NULL, "no stub found for static call"); |
aoqi@0 | 253 | // Creation also verifies the object. |
aoqi@0 | 254 | NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + IC_pos_in_java_to_interp_stub); |
aoqi@0 | 255 | NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); |
aoqi@0 | 256 | |
aoqi@0 | 257 | // Verify state. |
aoqi@0 | 258 | assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); |
aoqi@0 | 259 | } |
aoqi@0 | 260 | |
aoqi@0 | 261 | #endif // !PRODUCT |