1 /* 2 * Copyright (c) 2000, 2009, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.runtime; 26 27 import java.util.*; 28 import sun.jvm.hotspot.code.*; 29 import sun.jvm.hotspot.debugger.*; 30 import sun.jvm.hotspot.oops.*; 31 import sun.jvm.hotspot.utilities.*; 32 33 /** FIXME: missing many accessors; all we have right now is the method 34 and BCI. NOTE that this has been modified from the VM's version to 35 handle NULL ScopeDescs for the debugging case. This simplifies 36 using code a great deal. */ 37 38 public class CompiledVFrame extends JavaVFrame { 39 private ScopeDesc scope; 40 private boolean mayBeImprecise; 41 42 public CompiledVFrame(Frame fr, RegisterMap regMap, JavaThread thread, ScopeDesc scope, boolean mayBeImprecise) { 43 super(fr, regMap, thread); 44 this.scope = scope; 45 this.mayBeImprecise = mayBeImprecise; 46 if (!VM.getVM().isDebugging()) { 47 Assert.that(scope != null, "scope must be present"); 48 } 49 } 50 51 public boolean isTop() { 52 if (VM.getVM().isDebugging()) { 53 return (getScope() == null || getScope().isTop()); 54 } else { 55 return getScope().isTop(); 56 } 57 } 58 59 public boolean isCompiledFrame() { 60 return true; 61 } 62 63 public boolean isDeoptimized() { 64 return fr.isDeoptimized(); 65 } 66 67 public boolean mayBeImpreciseDbg() { 68 return mayBeImprecise; 69 } 70 71 /** Returns the active method */ 72 public NMethod getCode() { 73 return VM.getVM().getCodeCache().findNMethod(fr.getPC()); 74 } 75 76 /** Returns the active method. Does not perform a guarantee 77 regarding unloaded methods -- more suitable for debugging 78 system. */ 79 public NMethod getCodeUnsafe() { 80 return VM.getVM().getCodeCache().findNMethodUnsafe(fr.getPC()); 81 } 82 83 /** Returns the ScopeDesc */ 84 public ScopeDesc getScope() { 85 return scope; 86 } 87 88 public Method getMethod() { 89 if (VM.getVM().isDebugging() && getScope() == null) { 90 return getCodeUnsafe().getMethod(); 91 } 92 return getScope().getMethod(); 93 } 94 95 public StackValueCollection getLocals() { 96 if (getScope() == null) 97 return new StackValueCollection(); 98 List scvList = getScope().getLocals(); 99 if (scvList == null) 100 return new StackValueCollection(); 101 102 // scvList is the list of ScopeValues describing the JVM stack state. 103 // There is one scv_list entry for every JVM stack state in use. 104 int length = scvList.size(); 105 StackValueCollection result = new StackValueCollection(length); 106 for( int i = 0; i < length; i++ ) 107 result.add( createStackValue((ScopeValue) scvList.get(i)) ); 108 109 return result; 110 } 111 112 public StackValueCollection getExpressions() { 113 if (getScope() == null) 114 return new StackValueCollection(); 115 List scvList = getScope().getExpressions(); 116 if (scvList == null) 117 return new StackValueCollection(); 118 119 // scvList is the list of ScopeValues describing the JVM stack state. 120 // There is one scv_list entry for every JVM stack state in use. 121 int length = scvList.size(); 122 StackValueCollection result = new StackValueCollection(length); 123 for( int i = 0; i < length; i++ ) 124 result.add( createStackValue((ScopeValue) scvList.get(i)) ); 125 126 return result; 127 } 128 129 /** Returns List<MonitorInfo> */ 130 public List<MonitorInfo> getMonitors() { 131 List monitors = getScope().getMonitors(); 132 if (monitors == null) { 133 return new ArrayList<>(); 134 } 135 List<MonitorInfo> result = new ArrayList<>(monitors.size()); 136 for (int i = 0; i < monitors.size(); i++) { 137 MonitorValue mv = (MonitorValue) monitors.get(i); 138 ScopeValue ov = mv.owner(); 139 StackValue ownerSV = createStackValue(ov); // it is an oop 140 if (ov.isObject()) { // The owner object was scalar replaced 141 Assert.that(mv.eliminated() && ownerSV.objIsScalarReplaced(), "monitor should be eliminated for scalar replaced object"); 142 // Put klass for scalar replaced object. 143 ScopeValue kv = ((ObjectValue)ov).getKlass(); 144 Assert.that(kv.isConstantOop(), "klass should be oop constant for scalar replaced object"); 145 OopHandle k = ((ConstantOopReadValue)kv).getValue(); 146 result.add(new MonitorInfo(k, resolveMonitorLock(mv.basicLock()), mv.eliminated(), true)); 147 } else { 148 result.add(new MonitorInfo(ownerSV.getObject(), resolveMonitorLock(mv.basicLock()), mv.eliminated(), false)); 149 } 150 } 151 return result; 152 } 153 154 public int getBCI() { 155 int raw = getRawBCI(); 156 return ((raw == DebugInformationRecorder.SYNCHRONIZATION_ENTRY_BCI) ? 0 : raw); 157 } 158 159 /** Returns SynchronizationEntryBCI or bci() (used for synchronization) */ 160 public int getRawBCI() { 161 if (VM.getVM().isDebugging() && getScope() == null) { 162 return 0; // No debugging information! 163 } 164 return getScope().getBCI(); 165 } 166 167 /** Returns the sender vframe */ 168 public VFrame sender() { 169 if (Assert.ASSERTS_ENABLED) { 170 Assert.that(isTop(), "just checking"); 171 } 172 return sender(false); 173 } 174 175 public VFrame sender(boolean mayBeImprecise) { 176 if (!VM.getVM().isDebugging()) { 177 if (Assert.ASSERTS_ENABLED) { 178 Assert.that(scope != null, "When new stub generator is in place, then scope can never be NULL"); 179 } 180 } 181 Frame f = (Frame) getFrame().clone(); 182 return (isTop() 183 ? super.sender(false) 184 : new CompiledVFrame(f, getRegisterMap(), getThread(), getScope().sender(), mayBeImprecise)); 185 } 186 187 private StackValue createStackValue(ScopeValue sv) { 188 // FIXME: this code appears to be out-of-date with respect to the VM especially in 64-bit mode 189 if (sv.isLocation()) { 190 // Stack or register value 191 Location loc = ((LocationValue) sv).getLocation(); 192 193 if (loc.isIllegal()) return new StackValue(); 194 195 // First find address of value 196 Address valueAddr = loc.isRegister() 197 // Value was in a callee-save register 198 ? getRegisterMap().getLocation(new VMReg(loc.getRegisterNumber())) 199 // Else value was directly saved on the stack. The frame's original stack pointer, 200 // before any extension by its callee (due to Compiler1 linkage on SPARC), must be used. 201 : ((Address)fr.getUnextendedSP()).addOffsetTo(loc.getStackOffset()); 202 203 // Then package it right depending on type 204 if (loc.holdsFloat()) { // Holds a float in a double register? 205 // The callee has no clue whether the register holds a float, 206 // double or is unused. He always saves a double. Here we know 207 // a double was saved, but we only want a float back. Narrow the 208 // saved double to the float that the JVM wants. 209 if (Assert.ASSERTS_ENABLED) { 210 Assert.that( loc.isRegister(), "floats always saved to stack in 1 word" ); 211 } 212 float value = (float) valueAddr.getJDoubleAt(0); 213 return new StackValue(Float.floatToIntBits(value) & 0xFFFFFFFF); // 64-bit high half is stack junk 214 } else if (loc.holdsInt()) { // Holds an int in a long register? 215 // The callee has no clue whether the register holds an int, 216 // long or is unused. He always saves a long. Here we know 217 // a long was saved, but we only want an int back. Narrow the 218 // saved long to the int that the JVM wants. 219 if (Assert.ASSERTS_ENABLED) { 220 Assert.that( loc.isRegister(), "ints always saved to stack in 1 word" ); 221 } 222 return new StackValue(valueAddr.getJLongAt(0) & 0xFFFFFFFF); 223 } else if (loc.holdsNarrowOop()) { // Holds an narrow oop? 224 if (loc.isRegister() && VM.getVM().isBigEndian()) { 225 // The callee has no clue whether the register holds an narrow oop, 226 // long or is unused. He always saves a long. Here we know 227 // a long was saved, but we only want an narrow oop back. Narrow the 228 // saved long to the narrow oop that the JVM wants. 229 return new StackValue(valueAddr.getCompOopHandleAt(VM.getVM().getIntSize()), 0); 230 } else { 231 return new StackValue(valueAddr.getCompOopHandleAt(0), 0); 232 } 233 } else if( loc.holdsOop() ) { // Holds an oop? 234 return new StackValue(valueAddr.getOopHandleAt(0), 0); 235 } else if( loc.holdsDouble() ) { 236 // Double value in a single stack slot 237 return new StackValue(valueAddr.getJIntAt(0) & 0xFFFFFFFF); 238 } else if(loc.holdsAddr()) { 239 if (Assert.ASSERTS_ENABLED) { 240 Assert.that(!VM.getVM().isServerCompiler(), "No address type for locations with C2 (jsr-s are inlined)"); 241 } 242 // FIXME: not yet implemented (no access to safepoint state yet) 243 return new StackValue(0); 244 // intptr_t return_addr_tmp = *(intptr_t *)value_addr; 245 // int bci = -1; 246 // // Get the bci of the jsr that generated this returnAddress value. 247 // // If the destination of a jsr is a block that ends with a return or throw, then 248 // // the GraphBuilder converts the jsr into a direct goto. This has the side effect that 249 // // the return address for the jsr gets emitted as a bci instead of as a real pc 250 // if (code()->contains((address)return_addr_tmp)) { 251 // ScopeDesc* scope = code()->scope_desc_at((address)(return_addr_tmp - jsr_call_offset), false); 252 // bci = scope->bci(); 253 // } else { 254 // bci = (int)return_addr_tmp; 255 // } 256 // // no need to lock method as this happens at Safepoint 257 // assert (SafepointSynchronize::is_at_safepoint(), "must be at safepoint, otherwise lock method()"); 258 // // make sure bci points to jsr 259 // Bytecode* bytecode = Bytecode_at(method()->bcp_from(bci)); 260 // Bytecodes::Code bc = bytecode->code(); 261 // assert (bc == Bytecodes::_jsr || bc == Bytecodes::_jsr_w, "must be jsr"); 262 // 263 // // the real returnAddress is the bytecode following the jsr 264 // return new StackValue((intptr_t)(bci + Bytecodes::length_for(bc))); 265 } else if (VM.getVM().isLP64() && loc.holdsLong()) { 266 if ( loc.isRegister() ) { 267 // Long value in two registers, high half in the first, low in the second 268 return new StackValue(((valueAddr.getJLongAt(0) & 0xFFFFFFFF) << 32) | 269 ((valueAddr.getJLongAt(8) & 0xFFFFFFFF))); 270 } else { 271 // Long value in a single stack slot 272 return new StackValue(valueAddr.getJLongAt(0)); 273 } 274 } else if( loc.isRegister() ) { 275 // At the moment, all non-oop values in registers are 4 bytes, 276 // including double and long halves (see Compile::FillLocArray() in 277 // opto/output.cpp). Haul them out as such and return a StackValue 278 // containing an image of the value as it appears in a stack slot. 279 // If this is a double or long half, the interpreter _must_ deal 280 // with doubles and longs as entities split across two stack slots. 281 // To change this so doubles and/or longs can live in one stack slot, 282 // a StackValue will have to understand that it can contain an 283 // undivided double or long, implying that a Location (and the debug 284 // info mechanism) and FillLocArray() will also have to understand it. 285 return new StackValue(valueAddr.getJIntAt(0) & 0xFFFFFFFF); 286 } else { 287 return new StackValue(valueAddr.getJIntAt(0) & 0xFFFFFFFF); 288 } 289 } else if (sv.isConstantInt()) { 290 // Constant int: treat same as register int. 291 return new StackValue(((ConstantIntValue) sv).getValue() & 0xFFFFFFFF); 292 } else if (sv.isConstantOop()) { 293 // constant oop 294 return new StackValue(((ConstantOopReadValue) sv).getValue(), 0); 295 } else if (sv.isConstantDouble()) { 296 // Constant double in a single stack slot 297 double d = ((ConstantDoubleValue) sv).getValue(); 298 return new StackValue(Double.doubleToLongBits(d) & 0xFFFFFFFF); 299 } else if (VM.getVM().isLP64() && sv.isConstantLong()) { 300 // Constant long in a single stack slot 301 return new StackValue(((ConstantLongValue) sv).getValue() & 0xFFFFFFFF); 302 } else if (sv.isObject()) { 303 // Scalar replaced object in compiled frame 304 return new StackValue(((ObjectValue)sv).getValue(), 1); 305 } 306 307 // Unknown ScopeValue type 308 Assert.that(false, "Should not reach here"); 309 return new StackValue(0); // dummy 310 } 311 312 private BasicLock resolveMonitorLock(Location location) { 313 if (Assert.ASSERTS_ENABLED) { 314 Assert.that(location.isStack(), "for now we only look at the stack"); 315 } 316 int byteOffset = location.getStackOffset(); 317 // (stack picture) 318 // high: [ ] byte_offset + wordSize 319 // low [ ] byte_offset 320 // 321 // sp-> [ ] 0 322 // the byte_offset is the distance from the stack pointer to the lowest address 323 // The frame's original stack pointer, before any extension by its callee 324 // (due to Compiler1 linkage on SPARC), must be used. 325 return new BasicLock(getFrame().getUnextendedSP().addOffsetTo(byteOffset)); 326 } 327 }