ager@chromium.org | 5ec4892 | 2009-05-05 07:25:34 +0000 | [diff] [blame] | 1 | // Copyright 2009 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 28 | #include "v8.h" |
| 29 | |
| 30 | #include "bootstrapper.h" |
| 31 | #include "codegen-inl.h" |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 32 | #include "assembler-x64.h" |
ager@chromium.org | e2902be | 2009-06-08 12:21:35 +0000 | [diff] [blame] | 33 | #include "macro-assembler-x64.h" |
sgjesse@chromium.org | b9d7da1 | 2009-08-05 08:38:10 +0000 | [diff] [blame] | 34 | #include "serialize.h" |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 35 | #include "debug.h" |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 36 | |
| 37 | namespace v8 { |
| 38 | namespace internal { |
| 39 | |
| 40 | MacroAssembler::MacroAssembler(void* buffer, int size) |
| 41 | : Assembler(buffer, size), |
| 42 | unresolved_(0), |
| 43 | generating_stub_(false), |
| 44 | allow_stub_calls_(true), |
| 45 | code_object_(Heap::undefined_value()) { |
| 46 | } |
| 47 | |
ager@chromium.org | e2902be | 2009-06-08 12:21:35 +0000 | [diff] [blame] | 48 | |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame^] | 49 | void MacroAssembler::LoadRoot(Register destination, |
| 50 | Heap::RootListIndex index) { |
| 51 | movq(destination, Operand(r13, index << kPointerSizeLog2)); |
| 52 | } |
| 53 | |
| 54 | |
| 55 | void MacroAssembler::PushRoot(Heap::RootListIndex index) { |
| 56 | push(Operand(r13, index << kPointerSizeLog2)); |
| 57 | } |
| 58 | |
| 59 | |
| 60 | void MacroAssembler::CompareRoot(Register with, |
| 61 | Heap::RootListIndex index) { |
| 62 | cmpq(with, Operand(r13, index << kPointerSizeLog2)); |
| 63 | } |
| 64 | |
sgjesse@chromium.org | b9d7da1 | 2009-08-05 08:38:10 +0000 | [diff] [blame] | 65 | |
| 66 | static void RecordWriteHelper(MacroAssembler* masm, |
| 67 | Register object, |
| 68 | Register addr, |
| 69 | Register scratch) { |
| 70 | Label fast; |
| 71 | |
christian.plesner.hansen@gmail.com | 5a6af92 | 2009-08-12 14:20:51 +0000 | [diff] [blame] | 72 | // Compute the page start address from the heap object pointer, and reuse |
| 73 | // the 'object' register for it. |
sgjesse@chromium.org | b9d7da1 | 2009-08-05 08:38:10 +0000 | [diff] [blame] | 74 | ASSERT(is_int32(~Page::kPageAlignmentMask)); |
| 75 | masm->and_(object, |
| 76 | Immediate(static_cast<int32_t>(~Page::kPageAlignmentMask))); |
christian.plesner.hansen@gmail.com | 5a6af92 | 2009-08-12 14:20:51 +0000 | [diff] [blame] | 77 | Register page_start = object; |
sgjesse@chromium.org | b9d7da1 | 2009-08-05 08:38:10 +0000 | [diff] [blame] | 78 | |
christian.plesner.hansen@gmail.com | 5a6af92 | 2009-08-12 14:20:51 +0000 | [diff] [blame] | 79 | // Compute the bit addr in the remembered set/index of the pointer in the |
| 80 | // page. Reuse 'addr' as pointer_offset. |
| 81 | masm->subq(addr, page_start); |
sgjesse@chromium.org | b9d7da1 | 2009-08-05 08:38:10 +0000 | [diff] [blame] | 82 | masm->shr(addr, Immediate(kPointerSizeLog2)); |
christian.plesner.hansen@gmail.com | 5a6af92 | 2009-08-12 14:20:51 +0000 | [diff] [blame] | 83 | Register pointer_offset = addr; |
sgjesse@chromium.org | b9d7da1 | 2009-08-05 08:38:10 +0000 | [diff] [blame] | 84 | |
| 85 | // If the bit offset lies beyond the normal remembered set range, it is in |
| 86 | // the extra remembered set area of a large object. |
christian.plesner.hansen@gmail.com | 5a6af92 | 2009-08-12 14:20:51 +0000 | [diff] [blame] | 87 | masm->cmpq(pointer_offset, Immediate(Page::kPageSize / kPointerSize)); |
sgjesse@chromium.org | b9d7da1 | 2009-08-05 08:38:10 +0000 | [diff] [blame] | 88 | masm->j(less, &fast); |
| 89 | |
christian.plesner.hansen@gmail.com | 5a6af92 | 2009-08-12 14:20:51 +0000 | [diff] [blame] | 90 | // Adjust 'page_start' so that addressing using 'pointer_offset' hits the |
| 91 | // extra remembered set after the large object. |
| 92 | |
sgjesse@chromium.org | b9d7da1 | 2009-08-05 08:38:10 +0000 | [diff] [blame] | 93 | // Load the array length into 'scratch'. |
| 94 | masm->movl(scratch, |
christian.plesner.hansen@gmail.com | 5a6af92 | 2009-08-12 14:20:51 +0000 | [diff] [blame] | 95 | Operand(page_start, |
sgjesse@chromium.org | b9d7da1 | 2009-08-05 08:38:10 +0000 | [diff] [blame] | 96 | Page::kObjectStartOffset + FixedArray::kLengthOffset)); |
christian.plesner.hansen@gmail.com | 5a6af92 | 2009-08-12 14:20:51 +0000 | [diff] [blame] | 97 | Register array_length = scratch; |
| 98 | |
| 99 | // Extra remembered set starts right after the large object (a FixedArray), at |
| 100 | // page_start + kObjectStartOffset + objectSize |
| 101 | // where objectSize is FixedArray::kHeaderSize + kPointerSize * array_length. |
| 102 | // Add the delta between the end of the normal RSet and the start of the |
| 103 | // extra RSet to 'page_start', so that addressing the bit using |
| 104 | // 'pointer_offset' hits the extra RSet words. |
| 105 | masm->lea(page_start, |
| 106 | Operand(page_start, array_length, times_pointer_size, |
| 107 | Page::kObjectStartOffset + FixedArray::kHeaderSize |
| 108 | - Page::kRSetEndOffset)); |
sgjesse@chromium.org | b9d7da1 | 2009-08-05 08:38:10 +0000 | [diff] [blame] | 109 | |
| 110 | // NOTE: For now, we use the bit-test-and-set (bts) x86 instruction |
| 111 | // to limit code size. We should probably evaluate this decision by |
| 112 | // measuring the performance of an equivalent implementation using |
| 113 | // "simpler" instructions |
| 114 | masm->bind(&fast); |
christian.plesner.hansen@gmail.com | 5a6af92 | 2009-08-12 14:20:51 +0000 | [diff] [blame] | 115 | masm->bts(Operand(page_start, Page::kRSetOffset), pointer_offset); |
sgjesse@chromium.org | b9d7da1 | 2009-08-05 08:38:10 +0000 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | |
| 119 | class RecordWriteStub : public CodeStub { |
| 120 | public: |
| 121 | RecordWriteStub(Register object, Register addr, Register scratch) |
| 122 | : object_(object), addr_(addr), scratch_(scratch) { } |
| 123 | |
| 124 | void Generate(MacroAssembler* masm); |
| 125 | |
| 126 | private: |
| 127 | Register object_; |
| 128 | Register addr_; |
| 129 | Register scratch_; |
| 130 | |
| 131 | #ifdef DEBUG |
| 132 | void Print() { |
| 133 | PrintF("RecordWriteStub (object reg %d), (addr reg %d), (scratch reg %d)\n", |
| 134 | object_.code(), addr_.code(), scratch_.code()); |
| 135 | } |
| 136 | #endif |
| 137 | |
| 138 | // Minor key encoding in 12 bits of three registers (object, address and |
| 139 | // scratch) OOOOAAAASSSS. |
| 140 | class ScratchBits: public BitField<uint32_t, 0, 4> {}; |
| 141 | class AddressBits: public BitField<uint32_t, 4, 4> {}; |
| 142 | class ObjectBits: public BitField<uint32_t, 8, 4> {}; |
| 143 | |
| 144 | Major MajorKey() { return RecordWrite; } |
| 145 | |
| 146 | int MinorKey() { |
| 147 | // Encode the registers. |
| 148 | return ObjectBits::encode(object_.code()) | |
| 149 | AddressBits::encode(addr_.code()) | |
| 150 | ScratchBits::encode(scratch_.code()); |
| 151 | } |
| 152 | }; |
| 153 | |
| 154 | |
| 155 | void RecordWriteStub::Generate(MacroAssembler* masm) { |
| 156 | RecordWriteHelper(masm, object_, addr_, scratch_); |
| 157 | masm->ret(0); |
| 158 | } |
| 159 | |
| 160 | |
| 161 | // Set the remembered set bit for [object+offset]. |
| 162 | // object is the object being stored into, value is the object being stored. |
| 163 | // If offset is zero, then the scratch register contains the array index into |
| 164 | // the elements array represented as a Smi. |
| 165 | // All registers are clobbered by the operation. |
| 166 | void MacroAssembler::RecordWrite(Register object, |
| 167 | int offset, |
| 168 | Register value, |
| 169 | Register scratch) { |
| 170 | // First, check if a remembered set write is even needed. The tests below |
| 171 | // catch stores of Smis and stores into young gen (which does not have space |
| 172 | // for the remembered set bits. |
| 173 | Label done; |
| 174 | |
| 175 | // Test that the object address is not in the new space. We cannot |
| 176 | // set remembered set bits in the new space. |
| 177 | movq(value, object); |
| 178 | ASSERT(is_int32(static_cast<int64_t>(Heap::NewSpaceMask()))); |
| 179 | and_(value, Immediate(static_cast<int32_t>(Heap::NewSpaceMask()))); |
| 180 | movq(kScratchRegister, ExternalReference::new_space_start()); |
| 181 | cmpq(value, kScratchRegister); |
| 182 | j(equal, &done); |
| 183 | |
| 184 | if ((offset > 0) && (offset < Page::kMaxHeapObjectSize)) { |
| 185 | // Compute the bit offset in the remembered set, leave it in 'value'. |
| 186 | lea(value, Operand(object, offset)); |
| 187 | ASSERT(is_int32(Page::kPageAlignmentMask)); |
| 188 | and_(value, Immediate(static_cast<int32_t>(Page::kPageAlignmentMask))); |
| 189 | shr(value, Immediate(kObjectAlignmentBits)); |
| 190 | |
| 191 | // Compute the page address from the heap object pointer, leave it in |
| 192 | // 'object' (immediate value is sign extended). |
| 193 | and_(object, Immediate(~Page::kPageAlignmentMask)); |
| 194 | |
| 195 | // NOTE: For now, we use the bit-test-and-set (bts) x86 instruction |
| 196 | // to limit code size. We should probably evaluate this decision by |
| 197 | // measuring the performance of an equivalent implementation using |
| 198 | // "simpler" instructions |
| 199 | bts(Operand(object, Page::kRSetOffset), value); |
| 200 | } else { |
| 201 | Register dst = scratch; |
| 202 | if (offset != 0) { |
| 203 | lea(dst, Operand(object, offset)); |
| 204 | } else { |
| 205 | // array access: calculate the destination address in the same manner as |
| 206 | // KeyedStoreIC::GenerateGeneric. Multiply a smi by 4 to get an offset |
christian.plesner.hansen@gmail.com | 5a6af92 | 2009-08-12 14:20:51 +0000 | [diff] [blame] | 207 | // into an array of pointers. |
sgjesse@chromium.org | b9d7da1 | 2009-08-05 08:38:10 +0000 | [diff] [blame] | 208 | lea(dst, Operand(object, dst, times_half_pointer_size, |
| 209 | FixedArray::kHeaderSize - kHeapObjectTag)); |
| 210 | } |
| 211 | // If we are already generating a shared stub, not inlining the |
| 212 | // record write code isn't going to save us any memory. |
| 213 | if (generating_stub()) { |
| 214 | RecordWriteHelper(this, object, dst, value); |
| 215 | } else { |
| 216 | RecordWriteStub stub(object, dst, value); |
| 217 | CallStub(&stub); |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | bind(&done); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 222 | } |
| 223 | |
| 224 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 225 | void MacroAssembler::Assert(Condition cc, const char* msg) { |
| 226 | if (FLAG_debug_code) Check(cc, msg); |
| 227 | } |
| 228 | |
| 229 | |
| 230 | void MacroAssembler::Check(Condition cc, const char* msg) { |
| 231 | Label L; |
| 232 | j(cc, &L); |
| 233 | Abort(msg); |
| 234 | // will not return here |
| 235 | bind(&L); |
| 236 | } |
| 237 | |
| 238 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 239 | void MacroAssembler::NegativeZeroTest(Register result, |
| 240 | Register op, |
| 241 | Label* then_label) { |
| 242 | Label ok; |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 243 | testl(result, result); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 244 | j(not_zero, &ok); |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 245 | testl(op, op); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 246 | j(sign, then_label); |
| 247 | bind(&ok); |
| 248 | } |
| 249 | |
| 250 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 251 | void MacroAssembler::Abort(const char* msg) { |
| 252 | // We want to pass the msg string like a smi to avoid GC |
| 253 | // problems, however msg is not guaranteed to be aligned |
| 254 | // properly. Instead, we pass an aligned pointer that is |
| 255 | // a proper v8 smi, but also pass the alignment difference |
| 256 | // from the real pointer as a smi. |
| 257 | intptr_t p1 = reinterpret_cast<intptr_t>(msg); |
| 258 | intptr_t p0 = (p1 & ~kSmiTagMask) + kSmiTag; |
| 259 | // Note: p0 might not be a valid Smi *value*, but it has a valid Smi tag. |
| 260 | ASSERT(reinterpret_cast<Object*>(p0)->IsSmi()); |
| 261 | #ifdef DEBUG |
| 262 | if (msg != NULL) { |
| 263 | RecordComment("Abort message: "); |
| 264 | RecordComment(msg); |
| 265 | } |
| 266 | #endif |
| 267 | push(rax); |
| 268 | movq(kScratchRegister, p0, RelocInfo::NONE); |
| 269 | push(kScratchRegister); |
| 270 | movq(kScratchRegister, |
| 271 | reinterpret_cast<intptr_t>(Smi::FromInt(p1 - p0)), |
| 272 | RelocInfo::NONE); |
| 273 | push(kScratchRegister); |
| 274 | CallRuntime(Runtime::kAbort, 2); |
| 275 | // will not return here |
| 276 | } |
| 277 | |
| 278 | |
| 279 | void MacroAssembler::CallStub(CodeStub* stub) { |
| 280 | ASSERT(allow_stub_calls()); // calls are not allowed in some stubs |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 281 | Call(stub->GetCode(), RelocInfo::CODE_TARGET); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 282 | } |
| 283 | |
| 284 | |
| 285 | void MacroAssembler::StubReturn(int argc) { |
| 286 | ASSERT(argc >= 1 && generating_stub()); |
| 287 | ret((argc - 1) * kPointerSize); |
| 288 | } |
| 289 | |
| 290 | |
| 291 | void MacroAssembler::IllegalOperation(int num_arguments) { |
| 292 | if (num_arguments > 0) { |
| 293 | addq(rsp, Immediate(num_arguments * kPointerSize)); |
| 294 | } |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame^] | 295 | LoadRoot(rax, Heap::kUndefinedValueRootIndex); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 296 | } |
| 297 | |
| 298 | |
| 299 | void MacroAssembler::CallRuntime(Runtime::FunctionId id, int num_arguments) { |
| 300 | CallRuntime(Runtime::FunctionForId(id), num_arguments); |
| 301 | } |
| 302 | |
| 303 | |
| 304 | void MacroAssembler::CallRuntime(Runtime::Function* f, int num_arguments) { |
| 305 | // If the expected number of arguments of the runtime function is |
| 306 | // constant, we check that the actual number of arguments match the |
| 307 | // expectation. |
| 308 | if (f->nargs >= 0 && f->nargs != num_arguments) { |
| 309 | IllegalOperation(num_arguments); |
| 310 | return; |
| 311 | } |
| 312 | |
| 313 | Runtime::FunctionId function_id = |
| 314 | static_cast<Runtime::FunctionId>(f->stub_id); |
| 315 | RuntimeStub stub(function_id, num_arguments); |
| 316 | CallStub(&stub); |
| 317 | } |
| 318 | |
| 319 | |
| 320 | void MacroAssembler::TailCallRuntime(ExternalReference const& ext, |
| 321 | int num_arguments) { |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 322 | // ----------- S t a t e ------------- |
| 323 | // -- rsp[0] : return address |
| 324 | // -- rsp[8] : argument num_arguments - 1 |
| 325 | // ... |
| 326 | // -- rsp[8 * num_arguments] : argument 0 (receiver) |
| 327 | // ----------------------------------- |
| 328 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 329 | // TODO(1236192): Most runtime routines don't need the number of |
| 330 | // arguments passed in because it is constant. At some point we |
| 331 | // should remove this need and make the runtime routine entry code |
| 332 | // smarter. |
| 333 | movq(rax, Immediate(num_arguments)); |
| 334 | JumpToBuiltin(ext); |
| 335 | } |
| 336 | |
| 337 | |
| 338 | void MacroAssembler::JumpToBuiltin(const ExternalReference& ext) { |
| 339 | // Set the entry point and jump to the C entry runtime stub. |
| 340 | movq(rbx, ext); |
| 341 | CEntryStub ces; |
| 342 | movq(kScratchRegister, ces.GetCode(), RelocInfo::CODE_TARGET); |
| 343 | jmp(kScratchRegister); |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 344 | } |
| 345 | |
ager@chromium.org | e2902be | 2009-06-08 12:21:35 +0000 | [diff] [blame] | 346 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 347 | void MacroAssembler::GetBuiltinEntry(Register target, Builtins::JavaScript id) { |
| 348 | bool resolved; |
| 349 | Handle<Code> code = ResolveBuiltin(id, &resolved); |
| 350 | |
| 351 | const char* name = Builtins::GetName(id); |
| 352 | int argc = Builtins::GetArgumentsCount(id); |
| 353 | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 354 | movq(target, code, RelocInfo::EMBEDDED_OBJECT); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 355 | if (!resolved) { |
| 356 | uint32_t flags = |
| 357 | Bootstrapper::FixupFlagsArgumentsCount::encode(argc) | |
| 358 | Bootstrapper::FixupFlagsIsPCRelative::encode(false) | |
| 359 | Bootstrapper::FixupFlagsUseCodeObject::encode(true); |
| 360 | Unresolved entry = { pc_offset() - sizeof(intptr_t), flags, name }; |
| 361 | unresolved_.Add(entry); |
| 362 | } |
| 363 | addq(target, Immediate(Code::kHeaderSize - kHeapObjectTag)); |
| 364 | } |
| 365 | |
| 366 | |
| 367 | Handle<Code> MacroAssembler::ResolveBuiltin(Builtins::JavaScript id, |
| 368 | bool* resolved) { |
| 369 | // Move the builtin function into the temporary function slot by |
| 370 | // reading it from the builtins object. NOTE: We should be able to |
| 371 | // reduce this to two instructions by putting the function table in |
| 372 | // the global object instead of the "builtins" object and by using a |
| 373 | // real register for the function. |
| 374 | movq(rdx, Operand(rsi, Context::SlotOffset(Context::GLOBAL_INDEX))); |
| 375 | movq(rdx, FieldOperand(rdx, GlobalObject::kBuiltinsOffset)); |
| 376 | int builtins_offset = |
| 377 | JSBuiltinsObject::kJSBuiltinsOffset + (id * kPointerSize); |
| 378 | movq(rdi, FieldOperand(rdx, builtins_offset)); |
| 379 | |
| 380 | |
| 381 | return Builtins::GetCode(id, resolved); |
| 382 | } |
| 383 | |
| 384 | |
ager@chromium.org | e2902be | 2009-06-08 12:21:35 +0000 | [diff] [blame] | 385 | void MacroAssembler::Set(Register dst, int64_t x) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 386 | if (x == 0) { |
| 387 | xor_(dst, dst); |
| 388 | } else if (is_int32(x)) { |
ager@chromium.org | e2902be | 2009-06-08 12:21:35 +0000 | [diff] [blame] | 389 | movq(dst, Immediate(x)); |
| 390 | } else if (is_uint32(x)) { |
| 391 | movl(dst, Immediate(x)); |
| 392 | } else { |
| 393 | movq(dst, x, RelocInfo::NONE); |
| 394 | } |
| 395 | } |
| 396 | |
| 397 | |
| 398 | void MacroAssembler::Set(const Operand& dst, int64_t x) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 399 | if (x == 0) { |
| 400 | xor_(kScratchRegister, kScratchRegister); |
| 401 | movq(dst, kScratchRegister); |
| 402 | } else if (is_int32(x)) { |
| 403 | movq(dst, Immediate(x)); |
ager@chromium.org | e2902be | 2009-06-08 12:21:35 +0000 | [diff] [blame] | 404 | } else if (is_uint32(x)) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 405 | movl(dst, Immediate(x)); |
ager@chromium.org | e2902be | 2009-06-08 12:21:35 +0000 | [diff] [blame] | 406 | } else { |
| 407 | movq(kScratchRegister, x, RelocInfo::NONE); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 408 | movq(dst, kScratchRegister); |
ager@chromium.org | e2902be | 2009-06-08 12:21:35 +0000 | [diff] [blame] | 409 | } |
ager@chromium.org | e2902be | 2009-06-08 12:21:35 +0000 | [diff] [blame] | 410 | } |
| 411 | |
| 412 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 413 | bool MacroAssembler::IsUnsafeSmi(Smi* value) { |
| 414 | return false; |
| 415 | } |
| 416 | |
| 417 | void MacroAssembler::LoadUnsafeSmi(Register dst, Smi* source) { |
| 418 | UNIMPLEMENTED(); |
| 419 | } |
| 420 | |
| 421 | |
| 422 | void MacroAssembler::Move(Register dst, Handle<Object> source) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 423 | ASSERT(!source->IsFailure()); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 424 | if (source->IsSmi()) { |
| 425 | if (IsUnsafeSmi(source)) { |
| 426 | LoadUnsafeSmi(dst, source); |
| 427 | } else { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 428 | int32_t smi = static_cast<int32_t>(reinterpret_cast<intptr_t>(*source)); |
| 429 | movq(dst, Immediate(smi)); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 430 | } |
| 431 | } else { |
| 432 | movq(dst, source, RelocInfo::EMBEDDED_OBJECT); |
| 433 | } |
| 434 | } |
| 435 | |
| 436 | |
| 437 | void MacroAssembler::Move(const Operand& dst, Handle<Object> source) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 438 | if (source->IsSmi()) { |
| 439 | int32_t smi = static_cast<int32_t>(reinterpret_cast<intptr_t>(*source)); |
| 440 | movq(dst, Immediate(smi)); |
| 441 | } else { |
| 442 | movq(kScratchRegister, source, RelocInfo::EMBEDDED_OBJECT); |
| 443 | movq(dst, kScratchRegister); |
| 444 | } |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 445 | } |
| 446 | |
| 447 | |
| 448 | void MacroAssembler::Cmp(Register dst, Handle<Object> source) { |
| 449 | Move(kScratchRegister, source); |
| 450 | cmpq(dst, kScratchRegister); |
| 451 | } |
| 452 | |
| 453 | |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 454 | void MacroAssembler::Cmp(const Operand& dst, Handle<Object> source) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 455 | if (source->IsSmi()) { |
| 456 | if (IsUnsafeSmi(source)) { |
| 457 | LoadUnsafeSmi(kScratchRegister, source); |
| 458 | cmpl(dst, kScratchRegister); |
| 459 | } else { |
| 460 | // For smi-comparison, it suffices to compare the low 32 bits. |
| 461 | int32_t smi = static_cast<int32_t>(reinterpret_cast<intptr_t>(*source)); |
| 462 | cmpl(dst, Immediate(smi)); |
| 463 | } |
| 464 | } else { |
| 465 | ASSERT(source->IsHeapObject()); |
| 466 | movq(kScratchRegister, source, RelocInfo::EMBEDDED_OBJECT); |
| 467 | cmpq(dst, kScratchRegister); |
| 468 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 469 | } |
| 470 | |
| 471 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 472 | void MacroAssembler::Push(Handle<Object> source) { |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 473 | if (source->IsSmi()) { |
| 474 | if (IsUnsafeSmi(source)) { |
| 475 | LoadUnsafeSmi(kScratchRegister, source); |
| 476 | push(kScratchRegister); |
| 477 | } else { |
| 478 | int32_t smi = static_cast<int32_t>(reinterpret_cast<intptr_t>(*source)); |
| 479 | push(Immediate(smi)); |
| 480 | } |
| 481 | } else { |
| 482 | ASSERT(source->IsHeapObject()); |
| 483 | movq(kScratchRegister, source, RelocInfo::EMBEDDED_OBJECT); |
| 484 | push(kScratchRegister); |
| 485 | } |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 486 | } |
| 487 | |
| 488 | |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 489 | void MacroAssembler::Push(Smi* source) { |
| 490 | if (IsUnsafeSmi(source)) { |
| 491 | LoadUnsafeSmi(kScratchRegister, source); |
| 492 | push(kScratchRegister); |
| 493 | } else { |
| 494 | int32_t smi = static_cast<int32_t>(reinterpret_cast<intptr_t>(source)); |
| 495 | push(Immediate(smi)); |
| 496 | } |
| 497 | } |
| 498 | |
| 499 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 500 | void MacroAssembler::Jump(ExternalReference ext) { |
| 501 | movq(kScratchRegister, ext); |
| 502 | jmp(kScratchRegister); |
| 503 | } |
| 504 | |
| 505 | |
| 506 | void MacroAssembler::Jump(Address destination, RelocInfo::Mode rmode) { |
| 507 | movq(kScratchRegister, destination, rmode); |
| 508 | jmp(kScratchRegister); |
| 509 | } |
| 510 | |
| 511 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 512 | void MacroAssembler::Jump(Handle<Code> code_object, RelocInfo::Mode rmode) { |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 513 | ASSERT(RelocInfo::IsCodeTarget(rmode)); |
| 514 | movq(kScratchRegister, code_object, rmode); |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 515 | #ifdef DEBUG |
| 516 | Label target; |
| 517 | bind(&target); |
| 518 | #endif |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 519 | jmp(kScratchRegister); |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 520 | #ifdef DEBUG |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 521 | ASSERT_EQ(kPatchReturnSequenceLength, |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 522 | SizeOfCodeGeneratedSince(&target) + kPointerSize); |
| 523 | #endif |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 524 | } |
| 525 | |
| 526 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 527 | void MacroAssembler::Call(ExternalReference ext) { |
| 528 | movq(kScratchRegister, ext); |
| 529 | call(kScratchRegister); |
| 530 | } |
| 531 | |
| 532 | |
| 533 | void MacroAssembler::Call(Address destination, RelocInfo::Mode rmode) { |
| 534 | movq(kScratchRegister, destination, rmode); |
| 535 | call(kScratchRegister); |
| 536 | } |
| 537 | |
| 538 | |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 539 | void MacroAssembler::Call(Handle<Code> code_object, RelocInfo::Mode rmode) { |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 540 | ASSERT(RelocInfo::IsCodeTarget(rmode)); |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 541 | WriteRecordedPositions(); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 542 | movq(kScratchRegister, code_object, rmode); |
| 543 | #ifdef DEBUG |
sgjesse@chromium.org | 0b6db59 | 2009-07-30 14:48:31 +0000 | [diff] [blame] | 544 | // Patch target is kPointer size bytes *before* target label. |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 545 | Label target; |
| 546 | bind(&target); |
| 547 | #endif |
| 548 | call(kScratchRegister); |
| 549 | #ifdef DEBUG |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 550 | ASSERT_EQ(kPatchReturnSequenceLength, |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 551 | SizeOfCodeGeneratedSince(&target) + kPointerSize); |
| 552 | #endif |
| 553 | } |
| 554 | |
| 555 | |
ager@chromium.org | e2902be | 2009-06-08 12:21:35 +0000 | [diff] [blame] | 556 | void MacroAssembler::PushTryHandler(CodeLocation try_location, |
| 557 | HandlerType type) { |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 558 | // Adjust this code if not the case. |
| 559 | ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize); |
| 560 | |
| 561 | // The pc (return address) is already on TOS. This code pushes state, |
| 562 | // frame pointer and current handler. Check that they are expected |
| 563 | // next on the stack, in that order. |
ager@chromium.org | e2902be | 2009-06-08 12:21:35 +0000 | [diff] [blame] | 564 | ASSERT_EQ(StackHandlerConstants::kStateOffset, |
| 565 | StackHandlerConstants::kPCOffset - kPointerSize); |
ager@chromium.org | e2902be | 2009-06-08 12:21:35 +0000 | [diff] [blame] | 566 | ASSERT_EQ(StackHandlerConstants::kFPOffset, |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 567 | StackHandlerConstants::kStateOffset - kPointerSize); |
| 568 | ASSERT_EQ(StackHandlerConstants::kNextOffset, |
ager@chromium.org | e2902be | 2009-06-08 12:21:35 +0000 | [diff] [blame] | 569 | StackHandlerConstants::kFPOffset - kPointerSize); |
| 570 | |
| 571 | if (try_location == IN_JAVASCRIPT) { |
| 572 | if (type == TRY_CATCH_HANDLER) { |
| 573 | push(Immediate(StackHandler::TRY_CATCH)); |
| 574 | } else { |
| 575 | push(Immediate(StackHandler::TRY_FINALLY)); |
| 576 | } |
ager@chromium.org | e2902be | 2009-06-08 12:21:35 +0000 | [diff] [blame] | 577 | push(rbp); |
ager@chromium.org | e2902be | 2009-06-08 12:21:35 +0000 | [diff] [blame] | 578 | } else { |
| 579 | ASSERT(try_location == IN_JS_ENTRY); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 580 | // The frame pointer does not point to a JS frame so we save NULL |
| 581 | // for rbp. We expect the code throwing an exception to check rbp |
| 582 | // before dereferencing it to restore the context. |
ager@chromium.org | e2902be | 2009-06-08 12:21:35 +0000 | [diff] [blame] | 583 | push(Immediate(StackHandler::ENTRY)); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 584 | push(Immediate(0)); // NULL frame pointer. |
ager@chromium.org | e2902be | 2009-06-08 12:21:35 +0000 | [diff] [blame] | 585 | } |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 586 | // Save the current handler. |
ager@chromium.org | e2902be | 2009-06-08 12:21:35 +0000 | [diff] [blame] | 587 | movq(kScratchRegister, ExternalReference(Top::k_handler_address)); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 588 | push(Operand(kScratchRegister, 0)); |
ager@chromium.org | e2902be | 2009-06-08 12:21:35 +0000 | [diff] [blame] | 589 | // Link this handler. |
| 590 | movq(Operand(kScratchRegister, 0), rsp); |
| 591 | } |
| 592 | |
| 593 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 594 | void MacroAssembler::Ret() { |
| 595 | ret(0); |
| 596 | } |
| 597 | |
| 598 | |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 599 | void MacroAssembler::FCmp() { |
| 600 | fcompp(); |
| 601 | push(rax); |
| 602 | fnstsw_ax(); |
ager@chromium.org | 532c497 | 2009-09-01 16:23:26 +0000 | [diff] [blame] | 603 | if (CpuFeatures::IsSupported(CpuFeatures::SAHF)) { |
| 604 | sahf(); |
| 605 | } else { |
| 606 | shrl(rax, Immediate(8)); |
| 607 | and_(rax, Immediate(0xFF)); |
| 608 | push(rax); |
| 609 | popfq(); |
| 610 | } |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 611 | pop(rax); |
| 612 | } |
| 613 | |
| 614 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 615 | void MacroAssembler::CmpObjectType(Register heap_object, |
| 616 | InstanceType type, |
| 617 | Register map) { |
| 618 | movq(map, FieldOperand(heap_object, HeapObject::kMapOffset)); |
| 619 | CmpInstanceType(map, type); |
| 620 | } |
| 621 | |
| 622 | |
| 623 | void MacroAssembler::CmpInstanceType(Register map, InstanceType type) { |
| 624 | cmpb(FieldOperand(map, Map::kInstanceTypeOffset), |
| 625 | Immediate(static_cast<int8_t>(type))); |
| 626 | } |
| 627 | |
| 628 | |
kasperl@chromium.org | 86f77b7 | 2009-07-06 08:21:57 +0000 | [diff] [blame] | 629 | void MacroAssembler::TryGetFunctionPrototype(Register function, |
| 630 | Register result, |
| 631 | Label* miss) { |
| 632 | // Check that the receiver isn't a smi. |
| 633 | testl(function, Immediate(kSmiTagMask)); |
| 634 | j(zero, miss); |
| 635 | |
| 636 | // Check that the function really is a function. |
| 637 | CmpObjectType(function, JS_FUNCTION_TYPE, result); |
| 638 | j(not_equal, miss); |
| 639 | |
| 640 | // Make sure that the function has an instance prototype. |
| 641 | Label non_instance; |
| 642 | testb(FieldOperand(result, Map::kBitFieldOffset), |
| 643 | Immediate(1 << Map::kHasNonInstancePrototype)); |
| 644 | j(not_zero, &non_instance); |
| 645 | |
| 646 | // Get the prototype or initial map from the function. |
| 647 | movq(result, |
| 648 | FieldOperand(function, JSFunction::kPrototypeOrInitialMapOffset)); |
| 649 | |
| 650 | // If the prototype or initial map is the hole, don't return it and |
| 651 | // simply miss the cache instead. This will allow us to allocate a |
| 652 | // prototype object on-demand in the runtime system. |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame^] | 653 | CompareRoot(result, Heap::kTheHoleValueRootIndex); |
kasperl@chromium.org | 86f77b7 | 2009-07-06 08:21:57 +0000 | [diff] [blame] | 654 | j(equal, miss); |
| 655 | |
| 656 | // If the function does not have an initial map, we're done. |
| 657 | Label done; |
| 658 | CmpObjectType(result, MAP_TYPE, kScratchRegister); |
| 659 | j(not_equal, &done); |
| 660 | |
| 661 | // Get the prototype from the initial map. |
| 662 | movq(result, FieldOperand(result, Map::kPrototypeOffset)); |
| 663 | jmp(&done); |
| 664 | |
| 665 | // Non-instance prototype: Fetch prototype from constructor field |
| 666 | // in initial map. |
| 667 | bind(&non_instance); |
| 668 | movq(result, FieldOperand(result, Map::kConstructorOffset)); |
| 669 | |
| 670 | // All done. |
| 671 | bind(&done); |
| 672 | } |
| 673 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 674 | |
| 675 | void MacroAssembler::SetCounter(StatsCounter* counter, int value) { |
| 676 | if (FLAG_native_code_counters && counter->Enabled()) { |
| 677 | movq(kScratchRegister, ExternalReference(counter)); |
| 678 | movl(Operand(kScratchRegister, 0), Immediate(value)); |
| 679 | } |
| 680 | } |
| 681 | |
| 682 | |
| 683 | void MacroAssembler::IncrementCounter(StatsCounter* counter, int value) { |
| 684 | ASSERT(value > 0); |
| 685 | if (FLAG_native_code_counters && counter->Enabled()) { |
| 686 | movq(kScratchRegister, ExternalReference(counter)); |
| 687 | Operand operand(kScratchRegister, 0); |
| 688 | if (value == 1) { |
| 689 | incl(operand); |
| 690 | } else { |
| 691 | addl(operand, Immediate(value)); |
| 692 | } |
| 693 | } |
| 694 | } |
| 695 | |
| 696 | |
| 697 | void MacroAssembler::DecrementCounter(StatsCounter* counter, int value) { |
| 698 | ASSERT(value > 0); |
| 699 | if (FLAG_native_code_counters && counter->Enabled()) { |
| 700 | movq(kScratchRegister, ExternalReference(counter)); |
| 701 | Operand operand(kScratchRegister, 0); |
| 702 | if (value == 1) { |
| 703 | decl(operand); |
| 704 | } else { |
| 705 | subl(operand, Immediate(value)); |
| 706 | } |
| 707 | } |
| 708 | } |
| 709 | |
| 710 | |
| 711 | #ifdef ENABLE_DEBUGGER_SUPPORT |
| 712 | |
| 713 | void MacroAssembler::PushRegistersFromMemory(RegList regs) { |
| 714 | ASSERT((regs & ~kJSCallerSaved) == 0); |
| 715 | // Push the content of the memory location to the stack. |
| 716 | for (int i = 0; i < kNumJSCallerSaved; i++) { |
| 717 | int r = JSCallerSavedCode(i); |
| 718 | if ((regs & (1 << r)) != 0) { |
| 719 | ExternalReference reg_addr = |
| 720 | ExternalReference(Debug_Address::Register(i)); |
| 721 | movq(kScratchRegister, reg_addr); |
| 722 | push(Operand(kScratchRegister, 0)); |
| 723 | } |
| 724 | } |
| 725 | } |
| 726 | |
| 727 | void MacroAssembler::SaveRegistersToMemory(RegList regs) { |
| 728 | ASSERT((regs & ~kJSCallerSaved) == 0); |
| 729 | // Copy the content of registers to memory location. |
| 730 | for (int i = 0; i < kNumJSCallerSaved; i++) { |
| 731 | int r = JSCallerSavedCode(i); |
| 732 | if ((regs & (1 << r)) != 0) { |
| 733 | Register reg = { r }; |
| 734 | ExternalReference reg_addr = |
| 735 | ExternalReference(Debug_Address::Register(i)); |
| 736 | movq(kScratchRegister, reg_addr); |
| 737 | movq(Operand(kScratchRegister, 0), reg); |
| 738 | } |
| 739 | } |
| 740 | } |
| 741 | |
| 742 | |
| 743 | void MacroAssembler::RestoreRegistersFromMemory(RegList regs) { |
| 744 | ASSERT((regs & ~kJSCallerSaved) == 0); |
| 745 | // Copy the content of memory location to registers. |
| 746 | for (int i = kNumJSCallerSaved - 1; i >= 0; i--) { |
| 747 | int r = JSCallerSavedCode(i); |
| 748 | if ((regs & (1 << r)) != 0) { |
| 749 | Register reg = { r }; |
| 750 | ExternalReference reg_addr = |
| 751 | ExternalReference(Debug_Address::Register(i)); |
| 752 | movq(kScratchRegister, reg_addr); |
| 753 | movq(reg, Operand(kScratchRegister, 0)); |
| 754 | } |
| 755 | } |
| 756 | } |
| 757 | |
| 758 | |
| 759 | void MacroAssembler::PopRegistersToMemory(RegList regs) { |
| 760 | ASSERT((regs & ~kJSCallerSaved) == 0); |
| 761 | // Pop the content from the stack to the memory location. |
| 762 | for (int i = kNumJSCallerSaved - 1; i >= 0; i--) { |
| 763 | int r = JSCallerSavedCode(i); |
| 764 | if ((regs & (1 << r)) != 0) { |
| 765 | ExternalReference reg_addr = |
| 766 | ExternalReference(Debug_Address::Register(i)); |
| 767 | movq(kScratchRegister, reg_addr); |
| 768 | pop(Operand(kScratchRegister, 0)); |
| 769 | } |
| 770 | } |
| 771 | } |
| 772 | |
| 773 | |
| 774 | void MacroAssembler::CopyRegistersFromStackToMemory(Register base, |
| 775 | Register scratch, |
| 776 | RegList regs) { |
| 777 | ASSERT(!scratch.is(kScratchRegister)); |
| 778 | ASSERT(!base.is(kScratchRegister)); |
| 779 | ASSERT(!base.is(scratch)); |
| 780 | ASSERT((regs & ~kJSCallerSaved) == 0); |
| 781 | // Copy the content of the stack to the memory location and adjust base. |
| 782 | for (int i = kNumJSCallerSaved - 1; i >= 0; i--) { |
| 783 | int r = JSCallerSavedCode(i); |
| 784 | if ((regs & (1 << r)) != 0) { |
| 785 | movq(scratch, Operand(base, 0)); |
| 786 | ExternalReference reg_addr = |
| 787 | ExternalReference(Debug_Address::Register(i)); |
| 788 | movq(kScratchRegister, reg_addr); |
| 789 | movq(Operand(kScratchRegister, 0), scratch); |
| 790 | lea(base, Operand(base, kPointerSize)); |
| 791 | } |
| 792 | } |
| 793 | } |
| 794 | |
| 795 | #endif // ENABLE_DEBUGGER_SUPPORT |
| 796 | |
| 797 | |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 798 | void MacroAssembler::InvokeBuiltin(Builtins::JavaScript id, InvokeFlag flag) { |
| 799 | bool resolved; |
| 800 | Handle<Code> code = ResolveBuiltin(id, &resolved); |
| 801 | |
| 802 | // Calls are not allowed in some stubs. |
| 803 | ASSERT(flag == JUMP_FUNCTION || allow_stub_calls()); |
| 804 | |
| 805 | // Rely on the assertion to check that the number of provided |
| 806 | // arguments match the expected number of arguments. Fake a |
| 807 | // parameter count to avoid emitting code to do the check. |
| 808 | ParameterCount expected(0); |
| 809 | InvokeCode(Handle<Code>(code), expected, expected, |
| 810 | RelocInfo::CODE_TARGET, flag); |
| 811 | |
| 812 | const char* name = Builtins::GetName(id); |
| 813 | int argc = Builtins::GetArgumentsCount(id); |
| 814 | // The target address for the jump is stored as an immediate at offset |
| 815 | // kInvokeCodeAddressOffset. |
| 816 | if (!resolved) { |
| 817 | uint32_t flags = |
| 818 | Bootstrapper::FixupFlagsArgumentsCount::encode(argc) | |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 819 | Bootstrapper::FixupFlagsIsPCRelative::encode(false) | |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 820 | Bootstrapper::FixupFlagsUseCodeObject::encode(false); |
| 821 | Unresolved entry = |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 822 | { pc_offset() - kPatchReturnSequenceLength, flags, name }; |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 823 | unresolved_.Add(entry); |
| 824 | } |
| 825 | } |
| 826 | |
| 827 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 828 | void MacroAssembler::InvokePrologue(const ParameterCount& expected, |
| 829 | const ParameterCount& actual, |
| 830 | Handle<Code> code_constant, |
| 831 | Register code_register, |
| 832 | Label* done, |
| 833 | InvokeFlag flag) { |
| 834 | bool definitely_matches = false; |
| 835 | Label invoke; |
| 836 | if (expected.is_immediate()) { |
| 837 | ASSERT(actual.is_immediate()); |
| 838 | if (expected.immediate() == actual.immediate()) { |
| 839 | definitely_matches = true; |
| 840 | } else { |
| 841 | movq(rax, Immediate(actual.immediate())); |
| 842 | if (expected.immediate() == |
| 843 | SharedFunctionInfo::kDontAdaptArgumentsSentinel) { |
| 844 | // Don't worry about adapting arguments for built-ins that |
| 845 | // don't want that done. Skip adaption code by making it look |
| 846 | // like we have a match between expected and actual number of |
| 847 | // arguments. |
| 848 | definitely_matches = true; |
| 849 | } else { |
| 850 | movq(rbx, Immediate(expected.immediate())); |
| 851 | } |
| 852 | } |
| 853 | } else { |
| 854 | if (actual.is_immediate()) { |
| 855 | // Expected is in register, actual is immediate. This is the |
| 856 | // case when we invoke function values without going through the |
| 857 | // IC mechanism. |
| 858 | cmpq(expected.reg(), Immediate(actual.immediate())); |
| 859 | j(equal, &invoke); |
| 860 | ASSERT(expected.reg().is(rbx)); |
| 861 | movq(rax, Immediate(actual.immediate())); |
| 862 | } else if (!expected.reg().is(actual.reg())) { |
| 863 | // Both expected and actual are in (different) registers. This |
| 864 | // is the case when we invoke functions using call and apply. |
| 865 | cmpq(expected.reg(), actual.reg()); |
| 866 | j(equal, &invoke); |
| 867 | ASSERT(actual.reg().is(rax)); |
| 868 | ASSERT(expected.reg().is(rbx)); |
| 869 | } |
| 870 | } |
| 871 | |
| 872 | if (!definitely_matches) { |
| 873 | Handle<Code> adaptor = |
| 874 | Handle<Code>(Builtins::builtin(Builtins::ArgumentsAdaptorTrampoline)); |
| 875 | if (!code_constant.is_null()) { |
| 876 | movq(rdx, code_constant, RelocInfo::EMBEDDED_OBJECT); |
| 877 | addq(rdx, Immediate(Code::kHeaderSize - kHeapObjectTag)); |
| 878 | } else if (!code_register.is(rdx)) { |
| 879 | movq(rdx, code_register); |
| 880 | } |
| 881 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 882 | if (flag == CALL_FUNCTION) { |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 883 | Call(adaptor, RelocInfo::CODE_TARGET); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 884 | jmp(done); |
| 885 | } else { |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 886 | Jump(adaptor, RelocInfo::CODE_TARGET); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 887 | } |
| 888 | bind(&invoke); |
| 889 | } |
| 890 | } |
| 891 | |
| 892 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 893 | void MacroAssembler::InvokeCode(Register code, |
| 894 | const ParameterCount& expected, |
| 895 | const ParameterCount& actual, |
| 896 | InvokeFlag flag) { |
| 897 | Label done; |
| 898 | InvokePrologue(expected, actual, Handle<Code>::null(), code, &done, flag); |
| 899 | if (flag == CALL_FUNCTION) { |
| 900 | call(code); |
| 901 | } else { |
| 902 | ASSERT(flag == JUMP_FUNCTION); |
| 903 | jmp(code); |
| 904 | } |
| 905 | bind(&done); |
| 906 | } |
| 907 | |
| 908 | |
| 909 | void MacroAssembler::InvokeCode(Handle<Code> code, |
| 910 | const ParameterCount& expected, |
| 911 | const ParameterCount& actual, |
| 912 | RelocInfo::Mode rmode, |
| 913 | InvokeFlag flag) { |
| 914 | Label done; |
| 915 | Register dummy = rax; |
| 916 | InvokePrologue(expected, actual, code, dummy, &done, flag); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 917 | if (flag == CALL_FUNCTION) { |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 918 | Call(code, rmode); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 919 | } else { |
| 920 | ASSERT(flag == JUMP_FUNCTION); |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 921 | Jump(code, rmode); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 922 | } |
| 923 | bind(&done); |
| 924 | } |
| 925 | |
| 926 | |
| 927 | void MacroAssembler::InvokeFunction(Register function, |
| 928 | const ParameterCount& actual, |
| 929 | InvokeFlag flag) { |
| 930 | ASSERT(function.is(rdi)); |
| 931 | movq(rdx, FieldOperand(function, JSFunction::kSharedFunctionInfoOffset)); |
| 932 | movq(rsi, FieldOperand(function, JSFunction::kContextOffset)); |
ager@chromium.org | 3e87580 | 2009-06-29 08:26:34 +0000 | [diff] [blame] | 933 | movsxlq(rbx, |
| 934 | FieldOperand(rdx, SharedFunctionInfo::kFormalParameterCountOffset)); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 935 | movq(rdx, FieldOperand(rdx, SharedFunctionInfo::kCodeOffset)); |
ager@chromium.org | 5aa501c | 2009-06-23 07:57:28 +0000 | [diff] [blame] | 936 | // Advances rdx to the end of the Code object header, to the start of |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 937 | // the executable code. |
| 938 | lea(rdx, FieldOperand(rdx, Code::kHeaderSize)); |
| 939 | |
| 940 | ParameterCount expected(rbx); |
| 941 | InvokeCode(rdx, expected, actual, flag); |
| 942 | } |
| 943 | |
| 944 | |
| 945 | void MacroAssembler::EnterFrame(StackFrame::Type type) { |
| 946 | push(rbp); |
| 947 | movq(rbp, rsp); |
| 948 | push(rsi); // Context. |
| 949 | push(Immediate(Smi::FromInt(type))); |
| 950 | movq(kScratchRegister, CodeObject(), RelocInfo::EMBEDDED_OBJECT); |
| 951 | push(kScratchRegister); |
| 952 | if (FLAG_debug_code) { |
| 953 | movq(kScratchRegister, |
| 954 | Factory::undefined_value(), |
| 955 | RelocInfo::EMBEDDED_OBJECT); |
| 956 | cmpq(Operand(rsp, 0), kScratchRegister); |
| 957 | Check(not_equal, "code object not properly patched"); |
| 958 | } |
| 959 | } |
| 960 | |
| 961 | |
| 962 | void MacroAssembler::LeaveFrame(StackFrame::Type type) { |
| 963 | if (FLAG_debug_code) { |
| 964 | movq(kScratchRegister, Immediate(Smi::FromInt(type))); |
| 965 | cmpq(Operand(rbp, StandardFrameConstants::kMarkerOffset), kScratchRegister); |
| 966 | Check(equal, "stack frame types must match"); |
| 967 | } |
| 968 | movq(rsp, rbp); |
| 969 | pop(rbp); |
| 970 | } |
| 971 | |
| 972 | |
| 973 | |
| 974 | void MacroAssembler::EnterExitFrame(StackFrame::Type type) { |
| 975 | ASSERT(type == StackFrame::EXIT || type == StackFrame::EXIT_DEBUG); |
| 976 | |
| 977 | // Setup the frame structure on the stack. |
kasperl@chromium.org | 86f77b7 | 2009-07-06 08:21:57 +0000 | [diff] [blame] | 978 | // All constants are relative to the frame pointer of the exit frame. |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 979 | ASSERT(ExitFrameConstants::kCallerSPDisplacement == +2 * kPointerSize); |
| 980 | ASSERT(ExitFrameConstants::kCallerPCOffset == +1 * kPointerSize); |
| 981 | ASSERT(ExitFrameConstants::kCallerFPOffset == 0 * kPointerSize); |
| 982 | push(rbp); |
| 983 | movq(rbp, rsp); |
| 984 | |
| 985 | // Reserve room for entry stack pointer and push the debug marker. |
| 986 | ASSERT(ExitFrameConstants::kSPOffset == -1 * kPointerSize); |
| 987 | push(Immediate(0)); // saved entry sp, patched before call |
| 988 | push(Immediate(type == StackFrame::EXIT_DEBUG ? 1 : 0)); |
| 989 | |
| 990 | // Save the frame pointer and the context in top. |
| 991 | ExternalReference c_entry_fp_address(Top::k_c_entry_fp_address); |
| 992 | ExternalReference context_address(Top::k_context_address); |
kasperl@chromium.org | 86f77b7 | 2009-07-06 08:21:57 +0000 | [diff] [blame] | 993 | movq(r14, rax); // Backup rax before we use it. |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 994 | |
| 995 | movq(rax, rbp); |
| 996 | store_rax(c_entry_fp_address); |
| 997 | movq(rax, rsi); |
| 998 | store_rax(context_address); |
| 999 | |
| 1000 | // Setup argv in callee-saved register r15. It is reused in LeaveExitFrame, |
| 1001 | // so it must be retained across the C-call. |
| 1002 | int offset = StandardFrameConstants::kCallerSPOffset - kPointerSize; |
kasperl@chromium.org | 86f77b7 | 2009-07-06 08:21:57 +0000 | [diff] [blame] | 1003 | lea(r15, Operand(rbp, r14, times_pointer_size, offset)); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 1004 | |
| 1005 | #ifdef ENABLE_DEBUGGER_SUPPORT |
| 1006 | // Save the state of all registers to the stack from the memory |
| 1007 | // location. This is needed to allow nested break points. |
| 1008 | if (type == StackFrame::EXIT_DEBUG) { |
| 1009 | // TODO(1243899): This should be symmetric to |
| 1010 | // CopyRegistersFromStackToMemory() but it isn't! esp is assumed |
| 1011 | // correct here, but computed for the other call. Very error |
| 1012 | // prone! FIX THIS. Actually there are deeper problems with |
| 1013 | // register saving than this asymmetry (see the bug report |
| 1014 | // associated with this issue). |
| 1015 | PushRegistersFromMemory(kJSCallerSaved); |
| 1016 | } |
| 1017 | #endif |
| 1018 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 1019 | // Get the required frame alignment for the OS. |
| 1020 | static const int kFrameAlignment = OS::ActivationFrameAlignment(); |
| 1021 | if (kFrameAlignment > 0) { |
| 1022 | ASSERT(IsPowerOf2(kFrameAlignment)); |
| 1023 | movq(kScratchRegister, Immediate(-kFrameAlignment)); |
| 1024 | and_(rsp, kScratchRegister); |
| 1025 | } |
| 1026 | |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame^] | 1027 | #ifdef _WIN64 |
| 1028 | // Reserve space for the Arguments object. The Windows 64-bit ABI |
| 1029 | // requires us to pass this structure as a pointer to its location on |
| 1030 | // the stack. The structure contains 2 pointers. |
| 1031 | // The structure on the stack must be 16-byte aligned. |
| 1032 | // We also need backing space for 4 parameters, even though |
| 1033 | // we only pass one parameter, and it is in a register. |
| 1034 | subq(rsp, Immediate(6 * kPointerSize)); |
| 1035 | ASSERT(kFrameAlignment == 2 * kPointerSize); // Change the padding if needed. |
| 1036 | #endif |
| 1037 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 1038 | // Patch the saved entry sp. |
| 1039 | movq(Operand(rbp, ExitFrameConstants::kSPOffset), rsp); |
| 1040 | } |
| 1041 | |
| 1042 | |
| 1043 | void MacroAssembler::LeaveExitFrame(StackFrame::Type type) { |
| 1044 | // Registers: |
| 1045 | // r15 : argv |
| 1046 | #ifdef ENABLE_DEBUGGER_SUPPORT |
| 1047 | // Restore the memory copy of the registers by digging them out from |
| 1048 | // the stack. This is needed to allow nested break points. |
| 1049 | if (type == StackFrame::EXIT_DEBUG) { |
| 1050 | // It's okay to clobber register ebx below because we don't need |
| 1051 | // the function pointer after this. |
| 1052 | const int kCallerSavedSize = kNumJSCallerSaved * kPointerSize; |
| 1053 | int kOffset = ExitFrameConstants::kDebugMarkOffset - kCallerSavedSize; |
| 1054 | lea(rbx, Operand(rbp, kOffset)); |
| 1055 | CopyRegistersFromStackToMemory(rbx, rcx, kJSCallerSaved); |
| 1056 | } |
| 1057 | #endif |
| 1058 | |
| 1059 | // Get the return address from the stack and restore the frame pointer. |
| 1060 | movq(rcx, Operand(rbp, 1 * kPointerSize)); |
| 1061 | movq(rbp, Operand(rbp, 0 * kPointerSize)); |
| 1062 | |
| 1063 | // Pop the arguments and the receiver from the caller stack. |
| 1064 | lea(rsp, Operand(r15, 1 * kPointerSize)); |
| 1065 | |
| 1066 | // Restore current context from top and clear it in debug mode. |
| 1067 | ExternalReference context_address(Top::k_context_address); |
| 1068 | movq(kScratchRegister, context_address); |
| 1069 | movq(rsi, Operand(kScratchRegister, 0)); |
| 1070 | #ifdef DEBUG |
| 1071 | movq(Operand(kScratchRegister, 0), Immediate(0)); |
| 1072 | #endif |
| 1073 | |
| 1074 | // Push the return address to get ready to return. |
| 1075 | push(rcx); |
| 1076 | |
| 1077 | // Clear the top frame. |
| 1078 | ExternalReference c_entry_fp_address(Top::k_c_entry_fp_address); |
| 1079 | movq(kScratchRegister, c_entry_fp_address); |
| 1080 | movq(Operand(kScratchRegister, 0), Immediate(0)); |
| 1081 | } |
| 1082 | |
| 1083 | |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 1084 | Register MacroAssembler::CheckMaps(JSObject* object, Register object_reg, |
| 1085 | JSObject* holder, Register holder_reg, |
| 1086 | Register scratch, |
| 1087 | Label* miss) { |
| 1088 | // Make sure there's no overlap between scratch and the other |
| 1089 | // registers. |
| 1090 | ASSERT(!scratch.is(object_reg) && !scratch.is(holder_reg)); |
| 1091 | |
| 1092 | // Keep track of the current object in register reg. On the first |
| 1093 | // iteration, reg is an alias for object_reg, on later iterations, |
| 1094 | // it is an alias for holder_reg. |
| 1095 | Register reg = object_reg; |
| 1096 | int depth = 1; |
| 1097 | |
| 1098 | // Check the maps in the prototype chain. |
| 1099 | // Traverse the prototype chain from the object and do map checks. |
| 1100 | while (object != holder) { |
| 1101 | depth++; |
| 1102 | |
| 1103 | // Only global objects and objects that do not require access |
| 1104 | // checks are allowed in stubs. |
| 1105 | ASSERT(object->IsJSGlobalProxy() || !object->IsAccessCheckNeeded()); |
| 1106 | |
| 1107 | JSObject* prototype = JSObject::cast(object->GetPrototype()); |
| 1108 | if (Heap::InNewSpace(prototype)) { |
| 1109 | // Get the map of the current object. |
| 1110 | movq(scratch, FieldOperand(reg, HeapObject::kMapOffset)); |
| 1111 | Cmp(scratch, Handle<Map>(object->map())); |
| 1112 | // Branch on the result of the map check. |
| 1113 | j(not_equal, miss); |
| 1114 | // Check access rights to the global object. This has to happen |
| 1115 | // after the map check so that we know that the object is |
| 1116 | // actually a global object. |
| 1117 | if (object->IsJSGlobalProxy()) { |
| 1118 | CheckAccessGlobalProxy(reg, scratch, miss); |
| 1119 | |
| 1120 | // Restore scratch register to be the map of the object. |
| 1121 | // We load the prototype from the map in the scratch register. |
| 1122 | movq(scratch, FieldOperand(reg, HeapObject::kMapOffset)); |
| 1123 | } |
| 1124 | // The prototype is in new space; we cannot store a reference |
| 1125 | // to it in the code. Load it from the map. |
| 1126 | reg = holder_reg; // from now the object is in holder_reg |
| 1127 | movq(reg, FieldOperand(scratch, Map::kPrototypeOffset)); |
| 1128 | |
| 1129 | } else { |
| 1130 | // Check the map of the current object. |
| 1131 | Cmp(FieldOperand(reg, HeapObject::kMapOffset), |
| 1132 | Handle<Map>(object->map())); |
| 1133 | // Branch on the result of the map check. |
| 1134 | j(not_equal, miss); |
| 1135 | // Check access rights to the global object. This has to happen |
| 1136 | // after the map check so that we know that the object is |
| 1137 | // actually a global object. |
| 1138 | if (object->IsJSGlobalProxy()) { |
| 1139 | CheckAccessGlobalProxy(reg, scratch, miss); |
| 1140 | } |
| 1141 | // The prototype is in old space; load it directly. |
| 1142 | reg = holder_reg; // from now the object is in holder_reg |
| 1143 | Move(reg, Handle<JSObject>(prototype)); |
| 1144 | } |
| 1145 | |
| 1146 | // Go to the next object in the prototype chain. |
| 1147 | object = prototype; |
| 1148 | } |
| 1149 | |
| 1150 | // Check the holder map. |
| 1151 | Cmp(FieldOperand(reg, HeapObject::kMapOffset), |
| 1152 | Handle<Map>(holder->map())); |
| 1153 | j(not_equal, miss); |
| 1154 | |
| 1155 | // Log the check depth. |
| 1156 | LOG(IntEvent("check-maps-depth", depth)); |
| 1157 | |
| 1158 | // Perform security check for access to the global object and return |
| 1159 | // the holder register. |
| 1160 | ASSERT(object == holder); |
| 1161 | ASSERT(object->IsJSGlobalProxy() || !object->IsAccessCheckNeeded()); |
| 1162 | if (object->IsJSGlobalProxy()) { |
| 1163 | CheckAccessGlobalProxy(reg, scratch, miss); |
| 1164 | } |
| 1165 | return reg; |
| 1166 | } |
| 1167 | |
| 1168 | |
| 1169 | |
| 1170 | |
| 1171 | void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg, |
| 1172 | Register scratch, |
| 1173 | Label* miss) { |
| 1174 | Label same_contexts; |
| 1175 | |
| 1176 | ASSERT(!holder_reg.is(scratch)); |
| 1177 | ASSERT(!scratch.is(kScratchRegister)); |
| 1178 | // Load current lexical context from the stack frame. |
| 1179 | movq(scratch, Operand(rbp, StandardFrameConstants::kContextOffset)); |
| 1180 | |
| 1181 | // When generating debug code, make sure the lexical context is set. |
| 1182 | if (FLAG_debug_code) { |
| 1183 | cmpq(scratch, Immediate(0)); |
| 1184 | Check(not_equal, "we should not have an empty lexical context"); |
| 1185 | } |
| 1186 | // Load the global context of the current context. |
| 1187 | int offset = Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize; |
| 1188 | movq(scratch, FieldOperand(scratch, offset)); |
| 1189 | movq(scratch, FieldOperand(scratch, GlobalObject::kGlobalContextOffset)); |
| 1190 | |
| 1191 | // Check the context is a global context. |
| 1192 | if (FLAG_debug_code) { |
| 1193 | Cmp(FieldOperand(scratch, HeapObject::kMapOffset), |
| 1194 | Factory::global_context_map()); |
| 1195 | Check(equal, "JSGlobalObject::global_context should be a global context."); |
| 1196 | } |
| 1197 | |
| 1198 | // Check if both contexts are the same. |
| 1199 | cmpq(scratch, FieldOperand(holder_reg, JSGlobalProxy::kContextOffset)); |
| 1200 | j(equal, &same_contexts); |
| 1201 | |
| 1202 | // Compare security tokens. |
| 1203 | // Check that the security token in the calling global object is |
| 1204 | // compatible with the security token in the receiving global |
| 1205 | // object. |
| 1206 | |
| 1207 | // Check the context is a global context. |
| 1208 | if (FLAG_debug_code) { |
| 1209 | // Preserve original value of holder_reg. |
| 1210 | push(holder_reg); |
| 1211 | movq(holder_reg, FieldOperand(holder_reg, JSGlobalProxy::kContextOffset)); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame^] | 1212 | CompareRoot(holder_reg, Heap::kNullValueRootIndex); |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 1213 | Check(not_equal, "JSGlobalProxy::context() should not be null."); |
| 1214 | |
| 1215 | // Read the first word and compare to global_context_map(), |
| 1216 | movq(holder_reg, FieldOperand(holder_reg, HeapObject::kMapOffset)); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame^] | 1217 | CompareRoot(holder_reg, Heap::kGlobalContextMapRootIndex); |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 1218 | Check(equal, "JSGlobalObject::global_context should be a global context."); |
| 1219 | pop(holder_reg); |
| 1220 | } |
| 1221 | |
| 1222 | movq(kScratchRegister, |
| 1223 | FieldOperand(holder_reg, JSGlobalProxy::kContextOffset)); |
| 1224 | int token_offset = Context::kHeaderSize + |
| 1225 | Context::SECURITY_TOKEN_INDEX * kPointerSize; |
| 1226 | movq(scratch, FieldOperand(scratch, token_offset)); |
| 1227 | cmpq(scratch, FieldOperand(kScratchRegister, token_offset)); |
| 1228 | j(not_equal, miss); |
| 1229 | |
| 1230 | bind(&same_contexts); |
| 1231 | } |
| 1232 | |
| 1233 | |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame^] | 1234 | void MacroAssembler::LoadAllocationTopHelper( |
| 1235 | Register result, |
| 1236 | Register result_end, |
| 1237 | Register scratch, |
| 1238 | bool result_contains_top_on_entry) { |
| 1239 | ExternalReference new_space_allocation_top = |
| 1240 | ExternalReference::new_space_allocation_top_address(); |
| 1241 | |
| 1242 | // Just return if allocation top is already known. |
| 1243 | if (result_contains_top_on_entry) { |
| 1244 | // No use of scratch if allocation top is provided. |
| 1245 | ASSERT(scratch.is(no_reg)); |
| 1246 | return; |
| 1247 | } |
| 1248 | |
| 1249 | // Move address of new object to result. Use scratch register if available. |
| 1250 | if (scratch.is(no_reg)) { |
| 1251 | movq(kScratchRegister, new_space_allocation_top); |
| 1252 | movq(result, Operand(kScratchRegister, 0)); |
| 1253 | } else { |
| 1254 | ASSERT(!scratch.is(result_end)); |
| 1255 | movq(scratch, new_space_allocation_top); |
| 1256 | movq(result, Operand(scratch, 0)); |
| 1257 | } |
| 1258 | } |
| 1259 | |
| 1260 | |
| 1261 | void MacroAssembler::UpdateAllocationTopHelper(Register result_end, |
| 1262 | Register scratch) { |
| 1263 | ExternalReference new_space_allocation_top = |
| 1264 | ExternalReference::new_space_allocation_top_address(); |
| 1265 | |
| 1266 | // Update new top. |
| 1267 | if (result_end.is(rax)) { |
| 1268 | // rax can be stored directly to a memory location. |
| 1269 | store_rax(new_space_allocation_top); |
| 1270 | } else { |
| 1271 | // Register required - use scratch provided if available. |
| 1272 | if (scratch.is(no_reg)) { |
| 1273 | movq(kScratchRegister, new_space_allocation_top); |
| 1274 | movq(Operand(kScratchRegister, 0), result_end); |
| 1275 | } else { |
| 1276 | movq(Operand(scratch, 0), result_end); |
| 1277 | } |
| 1278 | } |
| 1279 | } |
| 1280 | |
| 1281 | |
| 1282 | void MacroAssembler::AllocateObjectInNewSpace( |
| 1283 | int object_size, |
| 1284 | Register result, |
| 1285 | Register result_end, |
| 1286 | Register scratch, |
| 1287 | Label* gc_required, |
| 1288 | bool result_contains_top_on_entry) { |
| 1289 | ASSERT(!result.is(result_end)); |
| 1290 | |
| 1291 | // Load address of new object into result. |
| 1292 | LoadAllocationTopHelper(result, |
| 1293 | result_end, |
| 1294 | scratch, |
| 1295 | result_contains_top_on_entry); |
| 1296 | |
| 1297 | // Calculate new top and bail out if new space is exhausted. |
| 1298 | ExternalReference new_space_allocation_limit = |
| 1299 | ExternalReference::new_space_allocation_limit_address(); |
| 1300 | lea(result_end, Operand(result, object_size)); |
| 1301 | movq(kScratchRegister, new_space_allocation_limit); |
| 1302 | cmpq(result_end, Operand(kScratchRegister, 0)); |
| 1303 | j(above, gc_required); |
| 1304 | |
| 1305 | // Update allocation top. |
| 1306 | UpdateAllocationTopHelper(result_end, scratch); |
| 1307 | } |
| 1308 | |
| 1309 | |
| 1310 | void MacroAssembler::AllocateObjectInNewSpace( |
| 1311 | int header_size, |
| 1312 | ScaleFactor element_size, |
| 1313 | Register element_count, |
| 1314 | Register result, |
| 1315 | Register result_end, |
| 1316 | Register scratch, |
| 1317 | Label* gc_required, |
| 1318 | bool result_contains_top_on_entry) { |
| 1319 | ASSERT(!result.is(result_end)); |
| 1320 | |
| 1321 | // Load address of new object into result. |
| 1322 | LoadAllocationTopHelper(result, |
| 1323 | result_end, |
| 1324 | scratch, |
| 1325 | result_contains_top_on_entry); |
| 1326 | |
| 1327 | // Calculate new top and bail out if new space is exhausted. |
| 1328 | ExternalReference new_space_allocation_limit = |
| 1329 | ExternalReference::new_space_allocation_limit_address(); |
| 1330 | lea(result_end, Operand(result, element_count, element_size, header_size)); |
| 1331 | movq(kScratchRegister, new_space_allocation_limit); |
| 1332 | cmpq(result_end, Operand(kScratchRegister, 0)); |
| 1333 | j(above, gc_required); |
| 1334 | |
| 1335 | // Update allocation top. |
| 1336 | UpdateAllocationTopHelper(result_end, scratch); |
| 1337 | } |
| 1338 | |
| 1339 | |
| 1340 | void MacroAssembler::AllocateObjectInNewSpace( |
| 1341 | Register object_size, |
| 1342 | Register result, |
| 1343 | Register result_end, |
| 1344 | Register scratch, |
| 1345 | Label* gc_required, |
| 1346 | bool result_contains_top_on_entry) { |
| 1347 | |
| 1348 | // Load address of new object into result. |
| 1349 | LoadAllocationTopHelper(result, |
| 1350 | result_end, |
| 1351 | scratch, |
| 1352 | result_contains_top_on_entry); |
| 1353 | |
| 1354 | |
| 1355 | // Calculate new top and bail out if new space is exhausted. |
| 1356 | ExternalReference new_space_allocation_limit = |
| 1357 | ExternalReference::new_space_allocation_limit_address(); |
| 1358 | if (!object_size.is(result_end)) { |
| 1359 | movq(result_end, object_size); |
| 1360 | } |
| 1361 | addq(result_end, result); |
| 1362 | movq(kScratchRegister, new_space_allocation_limit); |
| 1363 | cmpq(result_end, Operand(kScratchRegister, 0)); |
| 1364 | j(above, gc_required); |
| 1365 | |
| 1366 | // Update allocation top. |
| 1367 | UpdateAllocationTopHelper(result_end, scratch); |
| 1368 | } |
| 1369 | |
| 1370 | |
| 1371 | void MacroAssembler::UndoAllocationInNewSpace(Register object) { |
| 1372 | ExternalReference new_space_allocation_top = |
| 1373 | ExternalReference::new_space_allocation_top_address(); |
| 1374 | |
| 1375 | // Make sure the object has no tag before resetting top. |
| 1376 | and_(object, Immediate(~kHeapObjectTagMask)); |
| 1377 | movq(kScratchRegister, new_space_allocation_top); |
| 1378 | #ifdef DEBUG |
| 1379 | cmpq(object, Operand(kScratchRegister, 0)); |
| 1380 | Check(below, "Undo allocation of non allocated memory"); |
| 1381 | #endif |
| 1382 | movq(Operand(kScratchRegister, 0), object); |
| 1383 | } |
| 1384 | |
| 1385 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 1386 | } } // namespace v8::internal |