Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 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 | |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 28 | #include <limits.h> // For LONG_MIN, LONG_MAX. |
| 29 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 30 | #include "v8.h" |
| 31 | |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 32 | #if defined(V8_TARGET_ARCH_ARM) |
| 33 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 34 | #include "bootstrapper.h" |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 35 | #include "codegen.h" |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 36 | #include "debug.h" |
| 37 | #include "runtime.h" |
| 38 | |
| 39 | namespace v8 { |
| 40 | namespace internal { |
| 41 | |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 42 | MacroAssembler::MacroAssembler(Isolate* arg_isolate, void* buffer, int size) |
| 43 | : Assembler(arg_isolate, buffer, size), |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 44 | generating_stub_(false), |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 45 | allow_stub_calls_(true), |
| 46 | has_frame_(false) { |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 47 | if (isolate() != NULL) { |
| 48 | code_object_ = Handle<Object>(isolate()->heap()->undefined_value(), |
| 49 | isolate()); |
| 50 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 51 | } |
| 52 | |
| 53 | |
| 54 | // We always generate arm code, never thumb code, even if V8 is compiled to |
| 55 | // thumb, so we require inter-working support |
| 56 | #if defined(__thumb__) && !defined(USE_THUMB_INTERWORK) |
| 57 | #error "flag -mthumb-interwork missing" |
| 58 | #endif |
| 59 | |
| 60 | |
| 61 | // We do not support thumb inter-working with an arm architecture not supporting |
| 62 | // the blx instruction (below v5t). If you know what CPU you are compiling for |
| 63 | // you can use -march=armv7 or similar. |
| 64 | #if defined(USE_THUMB_INTERWORK) && !defined(CAN_USE_THUMB_INSTRUCTIONS) |
| 65 | # error "For thumb inter-working we require an architecture which supports blx" |
| 66 | #endif |
| 67 | |
| 68 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 69 | // Using bx does not yield better code, so use it only when required |
| 70 | #if defined(USE_THUMB_INTERWORK) |
| 71 | #define USE_BX 1 |
| 72 | #endif |
| 73 | |
| 74 | |
| 75 | void MacroAssembler::Jump(Register target, Condition cond) { |
| 76 | #if USE_BX |
| 77 | bx(target, cond); |
| 78 | #else |
| 79 | mov(pc, Operand(target), LeaveCC, cond); |
| 80 | #endif |
| 81 | } |
| 82 | |
| 83 | |
| 84 | void MacroAssembler::Jump(intptr_t target, RelocInfo::Mode rmode, |
| 85 | Condition cond) { |
| 86 | #if USE_BX |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 87 | mov(ip, Operand(target, rmode)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 88 | bx(ip, cond); |
| 89 | #else |
| 90 | mov(pc, Operand(target, rmode), LeaveCC, cond); |
| 91 | #endif |
| 92 | } |
| 93 | |
| 94 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 95 | void MacroAssembler::Jump(Address target, RelocInfo::Mode rmode, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 96 | Condition cond) { |
| 97 | ASSERT(!RelocInfo::IsCodeTarget(rmode)); |
| 98 | Jump(reinterpret_cast<intptr_t>(target), rmode, cond); |
| 99 | } |
| 100 | |
| 101 | |
| 102 | void MacroAssembler::Jump(Handle<Code> code, RelocInfo::Mode rmode, |
| 103 | Condition cond) { |
| 104 | ASSERT(RelocInfo::IsCodeTarget(rmode)); |
| 105 | // 'code' is always generated ARM code, never THUMB code |
| 106 | Jump(reinterpret_cast<intptr_t>(code.location()), rmode, cond); |
| 107 | } |
| 108 | |
| 109 | |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 110 | int MacroAssembler::CallSize(Register target, Condition cond) { |
| 111 | #if USE_BLX |
| 112 | return kInstrSize; |
| 113 | #else |
| 114 | return 2 * kInstrSize; |
| 115 | #endif |
| 116 | } |
| 117 | |
| 118 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 119 | void MacroAssembler::Call(Register target, Condition cond) { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 120 | // Block constant pool for the call instruction sequence. |
| 121 | BlockConstPoolScope block_const_pool(this); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 122 | Label start; |
| 123 | bind(&start); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 124 | #if USE_BLX |
| 125 | blx(target, cond); |
| 126 | #else |
| 127 | // set lr for return at current pc + 8 |
| 128 | mov(lr, Operand(pc), LeaveCC, cond); |
| 129 | mov(pc, Operand(target), LeaveCC, cond); |
| 130 | #endif |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 131 | ASSERT_EQ(CallSize(target, cond), SizeOfCodeGeneratedSince(&start)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 132 | } |
| 133 | |
| 134 | |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 135 | int MacroAssembler::CallSize( |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 136 | Address target, RelocInfo::Mode rmode, Condition cond) { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 137 | int size = 2 * kInstrSize; |
| 138 | Instr mov_instr = cond | MOV | LeaveCC; |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 139 | intptr_t immediate = reinterpret_cast<intptr_t>(target); |
| 140 | if (!Operand(immediate, rmode).is_single_instruction(mov_instr)) { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 141 | size += kInstrSize; |
| 142 | } |
| 143 | return size; |
| 144 | } |
| 145 | |
| 146 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 147 | void MacroAssembler::Call(Address target, |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 148 | RelocInfo::Mode rmode, |
| 149 | Condition cond) { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 150 | // Block constant pool for the call instruction sequence. |
| 151 | BlockConstPoolScope block_const_pool(this); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 152 | Label start; |
| 153 | bind(&start); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 154 | #if USE_BLX |
| 155 | // On ARMv5 and after the recommended call sequence is: |
| 156 | // ldr ip, [pc, #...] |
| 157 | // blx ip |
| 158 | |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 159 | // Statement positions are expected to be recorded when the target |
| 160 | // address is loaded. The mov method will automatically record |
| 161 | // positions when pc is the target, since this is not the case here |
| 162 | // we have to do it explicitly. |
| 163 | positions_recorder()->WriteRecordedPositions(); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 164 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 165 | mov(ip, Operand(reinterpret_cast<int32_t>(target), rmode)); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 166 | blx(ip, cond); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 167 | |
| 168 | ASSERT(kCallTargetAddressOffset == 2 * kInstrSize); |
| 169 | #else |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 170 | // Set lr for return at current pc + 8. |
| 171 | mov(lr, Operand(pc), LeaveCC, cond); |
| 172 | // Emit a ldr<cond> pc, [pc + offset of target in constant pool]. |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 173 | mov(pc, Operand(reinterpret_cast<int32_t>(target), rmode), LeaveCC, cond); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 174 | ASSERT(kCallTargetAddressOffset == kInstrSize); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 175 | #endif |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 176 | ASSERT_EQ(CallSize(target, rmode, cond), SizeOfCodeGeneratedSince(&start)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 177 | } |
| 178 | |
| 179 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 180 | int MacroAssembler::CallSize(Handle<Code> code, |
| 181 | RelocInfo::Mode rmode, |
| 182 | unsigned ast_id, |
| 183 | Condition cond) { |
| 184 | return CallSize(reinterpret_cast<Address>(code.location()), rmode, cond); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 185 | } |
| 186 | |
| 187 | |
| 188 | void MacroAssembler::Call(Handle<Code> code, |
| 189 | RelocInfo::Mode rmode, |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 190 | unsigned ast_id, |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 191 | Condition cond) { |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 192 | Label start; |
| 193 | bind(&start); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 194 | ASSERT(RelocInfo::IsCodeTarget(rmode)); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 195 | if (rmode == RelocInfo::CODE_TARGET && ast_id != kNoASTId) { |
| 196 | SetRecordedAstId(ast_id); |
| 197 | rmode = RelocInfo::CODE_TARGET_WITH_ID; |
| 198 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 199 | // 'code' is always generated ARM code, never THUMB code |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 200 | Call(reinterpret_cast<Address>(code.location()), rmode, cond); |
| 201 | ASSERT_EQ(CallSize(code, rmode, ast_id, cond), |
| 202 | SizeOfCodeGeneratedSince(&start)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | |
| 206 | void MacroAssembler::Ret(Condition cond) { |
| 207 | #if USE_BX |
| 208 | bx(lr, cond); |
| 209 | #else |
| 210 | mov(pc, Operand(lr), LeaveCC, cond); |
| 211 | #endif |
| 212 | } |
| 213 | |
| 214 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 215 | void MacroAssembler::Drop(int count, Condition cond) { |
| 216 | if (count > 0) { |
| 217 | add(sp, sp, Operand(count * kPointerSize), LeaveCC, cond); |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 222 | void MacroAssembler::Ret(int drop, Condition cond) { |
| 223 | Drop(drop, cond); |
| 224 | Ret(cond); |
| 225 | } |
| 226 | |
| 227 | |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 228 | void MacroAssembler::Swap(Register reg1, |
| 229 | Register reg2, |
| 230 | Register scratch, |
| 231 | Condition cond) { |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 232 | if (scratch.is(no_reg)) { |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 233 | eor(reg1, reg1, Operand(reg2), LeaveCC, cond); |
| 234 | eor(reg2, reg2, Operand(reg1), LeaveCC, cond); |
| 235 | eor(reg1, reg1, Operand(reg2), LeaveCC, cond); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 236 | } else { |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 237 | mov(scratch, reg1, LeaveCC, cond); |
| 238 | mov(reg1, reg2, LeaveCC, cond); |
| 239 | mov(reg2, scratch, LeaveCC, cond); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 240 | } |
| 241 | } |
| 242 | |
| 243 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 244 | void MacroAssembler::Call(Label* target) { |
| 245 | bl(target); |
| 246 | } |
| 247 | |
| 248 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 249 | void MacroAssembler::Push(Handle<Object> handle) { |
| 250 | mov(ip, Operand(handle)); |
| 251 | push(ip); |
| 252 | } |
| 253 | |
| 254 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 255 | void MacroAssembler::Move(Register dst, Handle<Object> value) { |
| 256 | mov(dst, Operand(value)); |
| 257 | } |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 258 | |
| 259 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 260 | void MacroAssembler::Move(Register dst, Register src, Condition cond) { |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 261 | if (!dst.is(src)) { |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 262 | mov(dst, src, LeaveCC, cond); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 263 | } |
| 264 | } |
| 265 | |
| 266 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 267 | void MacroAssembler::Move(DoubleRegister dst, DoubleRegister src) { |
| 268 | ASSERT(CpuFeatures::IsSupported(VFP3)); |
| 269 | CpuFeatures::Scope scope(VFP3); |
| 270 | if (!dst.is(src)) { |
| 271 | vmov(dst, src); |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | |
Kristian Monsen | 9dcf7e2 | 2010-06-28 14:14:28 +0100 | [diff] [blame] | 276 | void MacroAssembler::And(Register dst, Register src1, const Operand& src2, |
| 277 | Condition cond) { |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 278 | if (!src2.is_reg() && |
| 279 | !src2.must_use_constant_pool() && |
| 280 | src2.immediate() == 0) { |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 281 | mov(dst, Operand(0, RelocInfo::NONE), LeaveCC, cond); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 282 | |
| 283 | } else if (!src2.is_single_instruction() && |
| 284 | !src2.must_use_constant_pool() && |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 285 | CpuFeatures::IsSupported(ARMv7) && |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 286 | IsPowerOf2(src2.immediate() + 1)) { |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 287 | ubfx(dst, src1, 0, |
| 288 | WhichPowerOf2(static_cast<uint32_t>(src2.immediate()) + 1), cond); |
Teng-Hui Zhu | 3e5fa29 | 2010-11-09 16:16:48 -0800 | [diff] [blame] | 289 | |
| 290 | } else { |
| 291 | and_(dst, src1, src2, LeaveCC, cond); |
Kristian Monsen | 9dcf7e2 | 2010-06-28 14:14:28 +0100 | [diff] [blame] | 292 | } |
Kristian Monsen | 9dcf7e2 | 2010-06-28 14:14:28 +0100 | [diff] [blame] | 293 | } |
| 294 | |
| 295 | |
| 296 | void MacroAssembler::Ubfx(Register dst, Register src1, int lsb, int width, |
| 297 | Condition cond) { |
| 298 | ASSERT(lsb < 32); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 299 | if (!CpuFeatures::IsSupported(ARMv7)) { |
Kristian Monsen | 9dcf7e2 | 2010-06-28 14:14:28 +0100 | [diff] [blame] | 300 | int mask = (1 << (width + lsb)) - 1 - ((1 << lsb) - 1); |
| 301 | and_(dst, src1, Operand(mask), LeaveCC, cond); |
| 302 | if (lsb != 0) { |
| 303 | mov(dst, Operand(dst, LSR, lsb), LeaveCC, cond); |
| 304 | } |
| 305 | } else { |
| 306 | ubfx(dst, src1, lsb, width, cond); |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | |
| 311 | void MacroAssembler::Sbfx(Register dst, Register src1, int lsb, int width, |
| 312 | Condition cond) { |
| 313 | ASSERT(lsb < 32); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 314 | if (!CpuFeatures::IsSupported(ARMv7)) { |
Kristian Monsen | 9dcf7e2 | 2010-06-28 14:14:28 +0100 | [diff] [blame] | 315 | int mask = (1 << (width + lsb)) - 1 - ((1 << lsb) - 1); |
| 316 | and_(dst, src1, Operand(mask), LeaveCC, cond); |
| 317 | int shift_up = 32 - lsb - width; |
| 318 | int shift_down = lsb + shift_up; |
| 319 | if (shift_up != 0) { |
| 320 | mov(dst, Operand(dst, LSL, shift_up), LeaveCC, cond); |
| 321 | } |
| 322 | if (shift_down != 0) { |
| 323 | mov(dst, Operand(dst, ASR, shift_down), LeaveCC, cond); |
| 324 | } |
| 325 | } else { |
| 326 | sbfx(dst, src1, lsb, width, cond); |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 331 | void MacroAssembler::Bfi(Register dst, |
| 332 | Register src, |
| 333 | Register scratch, |
| 334 | int lsb, |
| 335 | int width, |
| 336 | Condition cond) { |
| 337 | ASSERT(0 <= lsb && lsb < 32); |
| 338 | ASSERT(0 <= width && width < 32); |
| 339 | ASSERT(lsb + width < 32); |
| 340 | ASSERT(!scratch.is(dst)); |
| 341 | if (width == 0) return; |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 342 | if (!CpuFeatures::IsSupported(ARMv7)) { |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 343 | int mask = (1 << (width + lsb)) - 1 - ((1 << lsb) - 1); |
| 344 | bic(dst, dst, Operand(mask)); |
| 345 | and_(scratch, src, Operand((1 << width) - 1)); |
| 346 | mov(scratch, Operand(scratch, LSL, lsb)); |
| 347 | orr(dst, dst, scratch); |
| 348 | } else { |
| 349 | bfi(dst, src, lsb, width, cond); |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | |
Kristian Monsen | 9dcf7e2 | 2010-06-28 14:14:28 +0100 | [diff] [blame] | 354 | void MacroAssembler::Bfc(Register dst, int lsb, int width, Condition cond) { |
| 355 | ASSERT(lsb < 32); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 356 | if (!CpuFeatures::IsSupported(ARMv7)) { |
Kristian Monsen | 9dcf7e2 | 2010-06-28 14:14:28 +0100 | [diff] [blame] | 357 | int mask = (1 << (width + lsb)) - 1 - ((1 << lsb) - 1); |
| 358 | bic(dst, dst, Operand(mask)); |
| 359 | } else { |
| 360 | bfc(dst, lsb, width, cond); |
| 361 | } |
| 362 | } |
| 363 | |
| 364 | |
Kristian Monsen | 50ef84f | 2010-07-29 15:18:00 +0100 | [diff] [blame] | 365 | void MacroAssembler::Usat(Register dst, int satpos, const Operand& src, |
| 366 | Condition cond) { |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 367 | if (!CpuFeatures::IsSupported(ARMv7)) { |
Kristian Monsen | 50ef84f | 2010-07-29 15:18:00 +0100 | [diff] [blame] | 368 | ASSERT(!dst.is(pc) && !src.rm().is(pc)); |
| 369 | ASSERT((satpos >= 0) && (satpos <= 31)); |
| 370 | |
| 371 | // These asserts are required to ensure compatibility with the ARMv7 |
| 372 | // implementation. |
| 373 | ASSERT((src.shift_op() == ASR) || (src.shift_op() == LSL)); |
| 374 | ASSERT(src.rs().is(no_reg)); |
| 375 | |
| 376 | Label done; |
| 377 | int satval = (1 << satpos) - 1; |
| 378 | |
| 379 | if (cond != al) { |
| 380 | b(NegateCondition(cond), &done); // Skip saturate if !condition. |
| 381 | } |
| 382 | if (!(src.is_reg() && dst.is(src.rm()))) { |
| 383 | mov(dst, src); |
| 384 | } |
| 385 | tst(dst, Operand(~satval)); |
| 386 | b(eq, &done); |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 387 | mov(dst, Operand(0, RelocInfo::NONE), LeaveCC, mi); // 0 if negative. |
Kristian Monsen | 50ef84f | 2010-07-29 15:18:00 +0100 | [diff] [blame] | 388 | mov(dst, Operand(satval), LeaveCC, pl); // satval if positive. |
| 389 | bind(&done); |
| 390 | } else { |
| 391 | usat(dst, satpos, src, cond); |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 396 | void MacroAssembler::LoadRoot(Register destination, |
| 397 | Heap::RootListIndex index, |
| 398 | Condition cond) { |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 399 | ldr(destination, MemOperand(kRootRegister, index << kPointerSizeLog2), cond); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 400 | } |
| 401 | |
| 402 | |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 403 | void MacroAssembler::StoreRoot(Register source, |
| 404 | Heap::RootListIndex index, |
| 405 | Condition cond) { |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 406 | str(source, MemOperand(kRootRegister, index << kPointerSizeLog2), cond); |
| 407 | } |
| 408 | |
| 409 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 410 | void MacroAssembler::LoadHeapObject(Register result, |
| 411 | Handle<HeapObject> object) { |
| 412 | if (isolate()->heap()->InNewSpace(*object)) { |
| 413 | Handle<JSGlobalPropertyCell> cell = |
| 414 | isolate()->factory()->NewJSGlobalPropertyCell(object); |
| 415 | mov(result, Operand(cell)); |
| 416 | ldr(result, FieldMemOperand(result, JSGlobalPropertyCell::kValueOffset)); |
| 417 | } else { |
| 418 | mov(result, Operand(object)); |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 419 | } |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 420 | } |
| 421 | |
| 422 | |
| 423 | void MacroAssembler::InNewSpace(Register object, |
| 424 | Register scratch, |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 425 | Condition cond, |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 426 | Label* branch) { |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 427 | ASSERT(cond == eq || cond == ne); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 428 | and_(scratch, object, Operand(ExternalReference::new_space_mask(isolate()))); |
| 429 | cmp(scratch, Operand(ExternalReference::new_space_start(isolate()))); |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 430 | b(cond, branch); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 431 | } |
| 432 | |
| 433 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 434 | void MacroAssembler::RecordWriteField( |
| 435 | Register object, |
| 436 | int offset, |
| 437 | Register value, |
| 438 | Register dst, |
| 439 | LinkRegisterStatus lr_status, |
| 440 | SaveFPRegsMode save_fp, |
| 441 | RememberedSetAction remembered_set_action, |
| 442 | SmiCheck smi_check) { |
| 443 | // First, check if a write barrier is even needed. The tests below |
| 444 | // catch stores of Smis. |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 445 | Label done; |
| 446 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 447 | // Skip barrier if writing a smi. |
| 448 | if (smi_check == INLINE_SMI_CHECK) { |
| 449 | JumpIfSmi(value, &done); |
| 450 | } |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 451 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 452 | // Although the object register is tagged, the offset is relative to the start |
| 453 | // of the object, so so offset must be a multiple of kPointerSize. |
| 454 | ASSERT(IsAligned(offset, kPointerSize)); |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 455 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 456 | add(dst, object, Operand(offset - kHeapObjectTag)); |
| 457 | if (emit_debug_code()) { |
| 458 | Label ok; |
| 459 | tst(dst, Operand((1 << kPointerSizeLog2) - 1)); |
| 460 | b(eq, &ok); |
| 461 | stop("Unaligned cell in write barrier"); |
| 462 | bind(&ok); |
| 463 | } |
| 464 | |
| 465 | RecordWrite(object, |
| 466 | dst, |
| 467 | value, |
| 468 | lr_status, |
| 469 | save_fp, |
| 470 | remembered_set_action, |
| 471 | OMIT_SMI_CHECK); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 472 | |
| 473 | bind(&done); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 474 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 475 | // Clobber clobbered input registers when running with the debug-code flag |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 476 | // turned on to provoke errors. |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 477 | if (emit_debug_code()) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 478 | mov(value, Operand(BitCast<int32_t>(kZapValue + 4))); |
| 479 | mov(dst, Operand(BitCast<int32_t>(kZapValue + 8))); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 480 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 481 | } |
| 482 | |
| 483 | |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 484 | // Will clobber 4 registers: object, address, scratch, ip. The |
| 485 | // register 'object' contains a heap object pointer. The heap object |
| 486 | // tag is shifted away. |
| 487 | void MacroAssembler::RecordWrite(Register object, |
| 488 | Register address, |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 489 | Register value, |
| 490 | LinkRegisterStatus lr_status, |
| 491 | SaveFPRegsMode fp_mode, |
| 492 | RememberedSetAction remembered_set_action, |
| 493 | SmiCheck smi_check) { |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 494 | // The compiled code assumes that record write doesn't change the |
| 495 | // context register, so we check that none of the clobbered |
| 496 | // registers are cp. |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 497 | ASSERT(!address.is(cp) && !value.is(cp)); |
| 498 | |
| 499 | if (emit_debug_code()) { |
| 500 | ldr(ip, MemOperand(address)); |
| 501 | cmp(ip, value); |
| 502 | Check(eq, "Wrong address or value passed to RecordWrite"); |
| 503 | } |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 504 | |
| 505 | Label done; |
| 506 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 507 | if (smi_check == INLINE_SMI_CHECK) { |
| 508 | ASSERT_EQ(0, kSmiTag); |
| 509 | tst(value, Operand(kSmiTagMask)); |
| 510 | b(eq, &done); |
| 511 | } |
| 512 | |
| 513 | CheckPageFlag(value, |
| 514 | value, // Used as scratch. |
| 515 | MemoryChunk::kPointersToHereAreInterestingMask, |
| 516 | eq, |
| 517 | &done); |
| 518 | CheckPageFlag(object, |
| 519 | value, // Used as scratch. |
| 520 | MemoryChunk::kPointersFromHereAreInterestingMask, |
| 521 | eq, |
| 522 | &done); |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 523 | |
| 524 | // Record the actual write. |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 525 | if (lr_status == kLRHasNotBeenSaved) { |
| 526 | push(lr); |
| 527 | } |
| 528 | RecordWriteStub stub(object, value, address, remembered_set_action, fp_mode); |
| 529 | CallStub(&stub); |
| 530 | if (lr_status == kLRHasNotBeenSaved) { |
| 531 | pop(lr); |
| 532 | } |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 533 | |
| 534 | bind(&done); |
| 535 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 536 | // Clobber clobbered registers when running with the debug-code flag |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 537 | // turned on to provoke errors. |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 538 | if (emit_debug_code()) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 539 | mov(address, Operand(BitCast<int32_t>(kZapValue + 12))); |
| 540 | mov(value, Operand(BitCast<int32_t>(kZapValue + 16))); |
| 541 | } |
| 542 | } |
| 543 | |
| 544 | |
| 545 | void MacroAssembler::RememberedSetHelper(Register object, // For debug tests. |
| 546 | Register address, |
| 547 | Register scratch, |
| 548 | SaveFPRegsMode fp_mode, |
| 549 | RememberedSetFinalAction and_then) { |
| 550 | Label done; |
| 551 | if (emit_debug_code()) { |
| 552 | Label ok; |
| 553 | JumpIfNotInNewSpace(object, scratch, &ok); |
| 554 | stop("Remembered set pointer is in new space"); |
| 555 | bind(&ok); |
| 556 | } |
| 557 | // Load store buffer top. |
| 558 | ExternalReference store_buffer = |
| 559 | ExternalReference::store_buffer_top(isolate()); |
| 560 | mov(ip, Operand(store_buffer)); |
| 561 | ldr(scratch, MemOperand(ip)); |
| 562 | // Store pointer to buffer and increment buffer top. |
| 563 | str(address, MemOperand(scratch, kPointerSize, PostIndex)); |
| 564 | // Write back new top of buffer. |
| 565 | str(scratch, MemOperand(ip)); |
| 566 | // Call stub on end of buffer. |
| 567 | // Check for end of buffer. |
| 568 | tst(scratch, Operand(StoreBuffer::kStoreBufferOverflowBit)); |
| 569 | if (and_then == kFallThroughAtEnd) { |
| 570 | b(eq, &done); |
| 571 | } else { |
| 572 | ASSERT(and_then == kReturnAtEnd); |
| 573 | Ret(eq); |
| 574 | } |
| 575 | push(lr); |
| 576 | StoreBufferOverflowStub store_buffer_overflow = |
| 577 | StoreBufferOverflowStub(fp_mode); |
| 578 | CallStub(&store_buffer_overflow); |
| 579 | pop(lr); |
| 580 | bind(&done); |
| 581 | if (and_then == kReturnAtEnd) { |
| 582 | Ret(); |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 583 | } |
| 584 | } |
| 585 | |
| 586 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 587 | // Push and pop all registers that can hold pointers. |
| 588 | void MacroAssembler::PushSafepointRegisters() { |
| 589 | // Safepoints expect a block of contiguous register values starting with r0: |
| 590 | ASSERT(((1 << kNumSafepointSavedRegisters) - 1) == kSafepointSavedRegisters); |
| 591 | // Safepoints expect a block of kNumSafepointRegisters values on the |
| 592 | // stack, so adjust the stack for unsaved registers. |
| 593 | const int num_unsaved = kNumSafepointRegisters - kNumSafepointSavedRegisters; |
| 594 | ASSERT(num_unsaved >= 0); |
| 595 | sub(sp, sp, Operand(num_unsaved * kPointerSize)); |
| 596 | stm(db_w, sp, kSafepointSavedRegisters); |
| 597 | } |
| 598 | |
| 599 | |
| 600 | void MacroAssembler::PopSafepointRegisters() { |
| 601 | const int num_unsaved = kNumSafepointRegisters - kNumSafepointSavedRegisters; |
| 602 | ldm(ia_w, sp, kSafepointSavedRegisters); |
| 603 | add(sp, sp, Operand(num_unsaved * kPointerSize)); |
| 604 | } |
| 605 | |
| 606 | |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 607 | void MacroAssembler::PushSafepointRegistersAndDoubles() { |
| 608 | PushSafepointRegisters(); |
| 609 | sub(sp, sp, Operand(DwVfpRegister::kNumAllocatableRegisters * |
| 610 | kDoubleSize)); |
| 611 | for (int i = 0; i < DwVfpRegister::kNumAllocatableRegisters; i++) { |
| 612 | vstr(DwVfpRegister::FromAllocationIndex(i), sp, i * kDoubleSize); |
| 613 | } |
| 614 | } |
| 615 | |
| 616 | |
| 617 | void MacroAssembler::PopSafepointRegistersAndDoubles() { |
| 618 | for (int i = 0; i < DwVfpRegister::kNumAllocatableRegisters; i++) { |
| 619 | vldr(DwVfpRegister::FromAllocationIndex(i), sp, i * kDoubleSize); |
| 620 | } |
| 621 | add(sp, sp, Operand(DwVfpRegister::kNumAllocatableRegisters * |
| 622 | kDoubleSize)); |
| 623 | PopSafepointRegisters(); |
| 624 | } |
| 625 | |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 626 | void MacroAssembler::StoreToSafepointRegistersAndDoublesSlot(Register src, |
| 627 | Register dst) { |
| 628 | str(src, SafepointRegistersAndDoublesSlot(dst)); |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 629 | } |
| 630 | |
| 631 | |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 632 | void MacroAssembler::StoreToSafepointRegisterSlot(Register src, Register dst) { |
| 633 | str(src, SafepointRegisterSlot(dst)); |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 634 | } |
| 635 | |
| 636 | |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 637 | void MacroAssembler::LoadFromSafepointRegisterSlot(Register dst, Register src) { |
| 638 | ldr(dst, SafepointRegisterSlot(src)); |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 639 | } |
| 640 | |
| 641 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 642 | int MacroAssembler::SafepointRegisterStackIndex(int reg_code) { |
| 643 | // The registers are pushed starting with the highest encoding, |
| 644 | // which means that lowest encodings are closest to the stack pointer. |
| 645 | ASSERT(reg_code >= 0 && reg_code < kNumSafepointRegisters); |
| 646 | return reg_code; |
| 647 | } |
| 648 | |
| 649 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 650 | MemOperand MacroAssembler::SafepointRegisterSlot(Register reg) { |
| 651 | return MemOperand(sp, SafepointRegisterStackIndex(reg.code()) * kPointerSize); |
| 652 | } |
| 653 | |
| 654 | |
| 655 | MemOperand MacroAssembler::SafepointRegistersAndDoublesSlot(Register reg) { |
| 656 | // General purpose registers are pushed last on the stack. |
| 657 | int doubles_size = DwVfpRegister::kNumAllocatableRegisters * kDoubleSize; |
| 658 | int register_offset = SafepointRegisterStackIndex(reg.code()) * kPointerSize; |
| 659 | return MemOperand(sp, doubles_size + register_offset); |
| 660 | } |
| 661 | |
| 662 | |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 663 | void MacroAssembler::Ldrd(Register dst1, Register dst2, |
| 664 | const MemOperand& src, Condition cond) { |
| 665 | ASSERT(src.rm().is(no_reg)); |
| 666 | ASSERT(!dst1.is(lr)); // r14. |
| 667 | ASSERT_EQ(0, dst1.code() % 2); |
| 668 | ASSERT_EQ(dst1.code() + 1, dst2.code()); |
| 669 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 670 | // V8 does not use this addressing mode, so the fallback code |
| 671 | // below doesn't support it yet. |
| 672 | ASSERT((src.am() != PreIndex) && (src.am() != NegPreIndex)); |
| 673 | |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 674 | // Generate two ldr instructions if ldrd is not available. |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 675 | if (CpuFeatures::IsSupported(ARMv7)) { |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 676 | CpuFeatures::Scope scope(ARMv7); |
| 677 | ldrd(dst1, dst2, src, cond); |
| 678 | } else { |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 679 | if ((src.am() == Offset) || (src.am() == NegOffset)) { |
| 680 | MemOperand src2(src); |
| 681 | src2.set_offset(src2.offset() + 4); |
| 682 | if (dst1.is(src.rn())) { |
| 683 | ldr(dst2, src2, cond); |
| 684 | ldr(dst1, src, cond); |
| 685 | } else { |
| 686 | ldr(dst1, src, cond); |
| 687 | ldr(dst2, src2, cond); |
| 688 | } |
| 689 | } else { // PostIndex or NegPostIndex. |
| 690 | ASSERT((src.am() == PostIndex) || (src.am() == NegPostIndex)); |
| 691 | if (dst1.is(src.rn())) { |
| 692 | ldr(dst2, MemOperand(src.rn(), 4, Offset), cond); |
| 693 | ldr(dst1, src, cond); |
| 694 | } else { |
| 695 | MemOperand src2(src); |
| 696 | src2.set_offset(src2.offset() - 4); |
| 697 | ldr(dst1, MemOperand(src.rn(), 4, PostIndex), cond); |
| 698 | ldr(dst2, src2, cond); |
| 699 | } |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 700 | } |
| 701 | } |
| 702 | } |
| 703 | |
| 704 | |
| 705 | void MacroAssembler::Strd(Register src1, Register src2, |
| 706 | const MemOperand& dst, Condition cond) { |
| 707 | ASSERT(dst.rm().is(no_reg)); |
| 708 | ASSERT(!src1.is(lr)); // r14. |
| 709 | ASSERT_EQ(0, src1.code() % 2); |
| 710 | ASSERT_EQ(src1.code() + 1, src2.code()); |
| 711 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 712 | // V8 does not use this addressing mode, so the fallback code |
| 713 | // below doesn't support it yet. |
| 714 | ASSERT((dst.am() != PreIndex) && (dst.am() != NegPreIndex)); |
| 715 | |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 716 | // Generate two str instructions if strd is not available. |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 717 | if (CpuFeatures::IsSupported(ARMv7)) { |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 718 | CpuFeatures::Scope scope(ARMv7); |
| 719 | strd(src1, src2, dst, cond); |
| 720 | } else { |
| 721 | MemOperand dst2(dst); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 722 | if ((dst.am() == Offset) || (dst.am() == NegOffset)) { |
| 723 | dst2.set_offset(dst2.offset() + 4); |
| 724 | str(src1, dst, cond); |
| 725 | str(src2, dst2, cond); |
| 726 | } else { // PostIndex or NegPostIndex. |
| 727 | ASSERT((dst.am() == PostIndex) || (dst.am() == NegPostIndex)); |
| 728 | dst2.set_offset(dst2.offset() - 4); |
| 729 | str(src1, MemOperand(dst.rn(), 4, PostIndex), cond); |
| 730 | str(src2, dst2, cond); |
| 731 | } |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 732 | } |
| 733 | } |
| 734 | |
| 735 | |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 736 | void MacroAssembler::ClearFPSCRBits(const uint32_t bits_to_clear, |
| 737 | const Register scratch, |
| 738 | const Condition cond) { |
| 739 | vmrs(scratch, cond); |
| 740 | bic(scratch, scratch, Operand(bits_to_clear), LeaveCC, cond); |
| 741 | vmsr(scratch, cond); |
| 742 | } |
| 743 | |
| 744 | |
| 745 | void MacroAssembler::VFPCompareAndSetFlags(const DwVfpRegister src1, |
| 746 | const DwVfpRegister src2, |
| 747 | const Condition cond) { |
| 748 | // Compare and move FPSCR flags to the normal condition flags. |
| 749 | VFPCompareAndLoadFlags(src1, src2, pc, cond); |
| 750 | } |
| 751 | |
| 752 | void MacroAssembler::VFPCompareAndSetFlags(const DwVfpRegister src1, |
| 753 | const double src2, |
| 754 | const Condition cond) { |
| 755 | // Compare and move FPSCR flags to the normal condition flags. |
| 756 | VFPCompareAndLoadFlags(src1, src2, pc, cond); |
| 757 | } |
| 758 | |
| 759 | |
| 760 | void MacroAssembler::VFPCompareAndLoadFlags(const DwVfpRegister src1, |
| 761 | const DwVfpRegister src2, |
| 762 | const Register fpscr_flags, |
| 763 | const Condition cond) { |
| 764 | // Compare and load FPSCR. |
| 765 | vcmp(src1, src2, cond); |
| 766 | vmrs(fpscr_flags, cond); |
| 767 | } |
| 768 | |
| 769 | void MacroAssembler::VFPCompareAndLoadFlags(const DwVfpRegister src1, |
| 770 | const double src2, |
| 771 | const Register fpscr_flags, |
| 772 | const Condition cond) { |
| 773 | // Compare and load FPSCR. |
| 774 | vcmp(src1, src2, cond); |
| 775 | vmrs(fpscr_flags, cond); |
Ben Murdoch | 086aeea | 2011-05-13 15:57:08 +0100 | [diff] [blame] | 776 | } |
| 777 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 778 | void MacroAssembler::Vmov(const DwVfpRegister dst, |
| 779 | const double imm, |
| 780 | const Condition cond) { |
| 781 | ASSERT(CpuFeatures::IsEnabled(VFP3)); |
| 782 | static const DoubleRepresentation minus_zero(-0.0); |
| 783 | static const DoubleRepresentation zero(0.0); |
| 784 | DoubleRepresentation value(imm); |
| 785 | // Handle special values first. |
| 786 | if (value.bits == zero.bits) { |
| 787 | vmov(dst, kDoubleRegZero, cond); |
| 788 | } else if (value.bits == minus_zero.bits) { |
| 789 | vneg(dst, kDoubleRegZero, cond); |
| 790 | } else { |
| 791 | vmov(dst, imm, cond); |
| 792 | } |
| 793 | } |
| 794 | |
Ben Murdoch | 086aeea | 2011-05-13 15:57:08 +0100 | [diff] [blame] | 795 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 796 | void MacroAssembler::EnterFrame(StackFrame::Type type) { |
| 797 | // r0-r3: preserved |
| 798 | stm(db_w, sp, cp.bit() | fp.bit() | lr.bit()); |
| 799 | mov(ip, Operand(Smi::FromInt(type))); |
| 800 | push(ip); |
| 801 | mov(ip, Operand(CodeObject())); |
| 802 | push(ip); |
| 803 | add(fp, sp, Operand(3 * kPointerSize)); // Adjust FP to point to saved FP. |
| 804 | } |
| 805 | |
| 806 | |
| 807 | void MacroAssembler::LeaveFrame(StackFrame::Type type) { |
| 808 | // r0: preserved |
| 809 | // r1: preserved |
| 810 | // r2: preserved |
| 811 | |
| 812 | // Drop the execution stack down to the frame pointer and restore |
| 813 | // the caller frame pointer and return address. |
| 814 | mov(sp, fp); |
| 815 | ldm(ia_w, sp, fp.bit() | lr.bit()); |
| 816 | } |
| 817 | |
| 818 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 819 | void MacroAssembler::EnterExitFrame(bool save_doubles, int stack_space) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 820 | // Set up the frame structure on the stack. |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 821 | ASSERT_EQ(2 * kPointerSize, ExitFrameConstants::kCallerSPDisplacement); |
| 822 | ASSERT_EQ(1 * kPointerSize, ExitFrameConstants::kCallerPCOffset); |
| 823 | ASSERT_EQ(0 * kPointerSize, ExitFrameConstants::kCallerFPOffset); |
| 824 | Push(lr, fp); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 825 | mov(fp, Operand(sp)); // Set up new frame pointer. |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 826 | // Reserve room for saved entry sp and code object. |
| 827 | sub(sp, sp, Operand(2 * kPointerSize)); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 828 | if (emit_debug_code()) { |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 829 | mov(ip, Operand(0)); |
| 830 | str(ip, MemOperand(fp, ExitFrameConstants::kSPOffset)); |
| 831 | } |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 832 | mov(ip, Operand(CodeObject())); |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 833 | str(ip, MemOperand(fp, ExitFrameConstants::kCodeOffset)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 834 | |
| 835 | // Save the frame pointer and the context in top. |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 836 | mov(ip, Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate()))); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 837 | str(fp, MemOperand(ip)); |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 838 | mov(ip, Operand(ExternalReference(Isolate::kContextAddress, isolate()))); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 839 | str(cp, MemOperand(ip)); |
| 840 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 841 | // Optionally save all double registers. |
| 842 | if (save_doubles) { |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 843 | DwVfpRegister first = d0; |
| 844 | DwVfpRegister last = |
| 845 | DwVfpRegister::from_code(DwVfpRegister::kNumRegisters - 1); |
| 846 | vstm(db_w, sp, first, last); |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 847 | // Note that d0 will be accessible at |
| 848 | // fp - 2 * kPointerSize - DwVfpRegister::kNumRegisters * kDoubleSize, |
| 849 | // since the sp slot and code slot were pushed after the fp. |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 850 | } |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 851 | |
| 852 | // Reserve place for the return address and stack space and align the frame |
| 853 | // preparing for calling the runtime function. |
| 854 | const int frame_alignment = MacroAssembler::ActivationFrameAlignment(); |
| 855 | sub(sp, sp, Operand((stack_space + 1) * kPointerSize)); |
| 856 | if (frame_alignment > 0) { |
| 857 | ASSERT(IsPowerOf2(frame_alignment)); |
| 858 | and_(sp, sp, Operand(-frame_alignment)); |
| 859 | } |
| 860 | |
| 861 | // Set the exit frame sp value to point just before the return address |
| 862 | // location. |
| 863 | add(ip, sp, Operand(kPointerSize)); |
| 864 | str(ip, MemOperand(fp, ExitFrameConstants::kSPOffset)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 865 | } |
| 866 | |
| 867 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 868 | void MacroAssembler::InitializeNewString(Register string, |
| 869 | Register length, |
| 870 | Heap::RootListIndex map_index, |
| 871 | Register scratch1, |
| 872 | Register scratch2) { |
| 873 | mov(scratch1, Operand(length, LSL, kSmiTagSize)); |
| 874 | LoadRoot(scratch2, map_index); |
| 875 | str(scratch1, FieldMemOperand(string, String::kLengthOffset)); |
| 876 | mov(scratch1, Operand(String::kEmptyHashField)); |
| 877 | str(scratch2, FieldMemOperand(string, HeapObject::kMapOffset)); |
| 878 | str(scratch1, FieldMemOperand(string, String::kHashFieldOffset)); |
| 879 | } |
| 880 | |
| 881 | |
| 882 | int MacroAssembler::ActivationFrameAlignment() { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 883 | #if defined(V8_HOST_ARCH_ARM) |
| 884 | // Running on the real platform. Use the alignment as mandated by the local |
| 885 | // environment. |
| 886 | // Note: This will break if we ever start generating snapshots on one ARM |
| 887 | // platform for another ARM platform with a different alignment. |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 888 | return OS::ActivationFrameAlignment(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 889 | #else // defined(V8_HOST_ARCH_ARM) |
| 890 | // If we are using the simulator then we should always align to the expected |
| 891 | // alignment. As the simulator is used to generate snapshots we do not know |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 892 | // if the target platform will need alignment, so this is controlled from a |
| 893 | // flag. |
| 894 | return FLAG_sim_stack_alignment; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 895 | #endif // defined(V8_HOST_ARCH_ARM) |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 896 | } |
| 897 | |
| 898 | |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 899 | void MacroAssembler::LeaveExitFrame(bool save_doubles, |
| 900 | Register argument_count) { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 901 | // Optionally restore all double registers. |
| 902 | if (save_doubles) { |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 903 | // Calculate the stack location of the saved doubles and restore them. |
| 904 | const int offset = 2 * kPointerSize; |
| 905 | sub(r3, fp, Operand(offset + DwVfpRegister::kNumRegisters * kDoubleSize)); |
| 906 | DwVfpRegister first = d0; |
| 907 | DwVfpRegister last = |
| 908 | DwVfpRegister::from_code(DwVfpRegister::kNumRegisters - 1); |
| 909 | vldm(ia, r3, first, last); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 910 | } |
| 911 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 912 | // Clear top frame. |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 913 | mov(r3, Operand(0, RelocInfo::NONE)); |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 914 | mov(ip, Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate()))); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 915 | str(r3, MemOperand(ip)); |
| 916 | |
| 917 | // Restore current context from top and clear it in debug mode. |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 918 | mov(ip, Operand(ExternalReference(Isolate::kContextAddress, isolate()))); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 919 | ldr(cp, MemOperand(ip)); |
| 920 | #ifdef DEBUG |
| 921 | str(r3, MemOperand(ip)); |
| 922 | #endif |
| 923 | |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 924 | // Tear down the exit frame, pop the arguments, and return. |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 925 | mov(sp, Operand(fp)); |
| 926 | ldm(ia_w, sp, fp.bit() | lr.bit()); |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 927 | if (argument_count.is_valid()) { |
| 928 | add(sp, sp, Operand(argument_count, LSL, kPointerSizeLog2)); |
| 929 | } |
| 930 | } |
| 931 | |
| 932 | void MacroAssembler::GetCFunctionDoubleResult(const DoubleRegister dst) { |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 933 | if (use_eabi_hardfloat()) { |
| 934 | Move(dst, d0); |
| 935 | } else { |
| 936 | vmov(dst, r0, r1); |
| 937 | } |
| 938 | } |
| 939 | |
| 940 | |
| 941 | void MacroAssembler::SetCallKind(Register dst, CallKind call_kind) { |
| 942 | // This macro takes the dst register to make the code more readable |
| 943 | // at the call sites. However, the dst register has to be r5 to |
| 944 | // follow the calling convention which requires the call type to be |
| 945 | // in r5. |
| 946 | ASSERT(dst.is(r5)); |
| 947 | if (call_kind == CALL_AS_FUNCTION) { |
| 948 | mov(dst, Operand(Smi::FromInt(1))); |
| 949 | } else { |
| 950 | mov(dst, Operand(Smi::FromInt(0))); |
| 951 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 952 | } |
| 953 | |
| 954 | |
| 955 | void MacroAssembler::InvokePrologue(const ParameterCount& expected, |
| 956 | const ParameterCount& actual, |
| 957 | Handle<Code> code_constant, |
| 958 | Register code_reg, |
| 959 | Label* done, |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 960 | bool* definitely_mismatches, |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 961 | InvokeFlag flag, |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 962 | const CallWrapper& call_wrapper, |
| 963 | CallKind call_kind) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 964 | bool definitely_matches = false; |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 965 | *definitely_mismatches = false; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 966 | Label regular_invoke; |
| 967 | |
| 968 | // Check whether the expected and actual arguments count match. If not, |
| 969 | // setup registers according to contract with ArgumentsAdaptorTrampoline: |
| 970 | // r0: actual arguments count |
| 971 | // r1: function (passed through to callee) |
| 972 | // r2: expected arguments count |
| 973 | // r3: callee code entry |
| 974 | |
| 975 | // The code below is made a lot easier because the calling code already sets |
| 976 | // up actual and expected registers according to the contract if values are |
| 977 | // passed in registers. |
| 978 | ASSERT(actual.is_immediate() || actual.reg().is(r0)); |
| 979 | ASSERT(expected.is_immediate() || expected.reg().is(r2)); |
| 980 | ASSERT((!code_constant.is_null() && code_reg.is(no_reg)) || code_reg.is(r3)); |
| 981 | |
| 982 | if (expected.is_immediate()) { |
| 983 | ASSERT(actual.is_immediate()); |
| 984 | if (expected.immediate() == actual.immediate()) { |
| 985 | definitely_matches = true; |
| 986 | } else { |
| 987 | mov(r0, Operand(actual.immediate())); |
| 988 | const int sentinel = SharedFunctionInfo::kDontAdaptArgumentsSentinel; |
| 989 | if (expected.immediate() == sentinel) { |
| 990 | // Don't worry about adapting arguments for builtins that |
| 991 | // don't want that done. Skip adaption code by making it look |
| 992 | // like we have a match between expected and actual number of |
| 993 | // arguments. |
| 994 | definitely_matches = true; |
| 995 | } else { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 996 | *definitely_mismatches = true; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 997 | mov(r2, Operand(expected.immediate())); |
| 998 | } |
| 999 | } |
| 1000 | } else { |
| 1001 | if (actual.is_immediate()) { |
| 1002 | cmp(expected.reg(), Operand(actual.immediate())); |
| 1003 | b(eq, ®ular_invoke); |
| 1004 | mov(r0, Operand(actual.immediate())); |
| 1005 | } else { |
| 1006 | cmp(expected.reg(), Operand(actual.reg())); |
| 1007 | b(eq, ®ular_invoke); |
| 1008 | } |
| 1009 | } |
| 1010 | |
| 1011 | if (!definitely_matches) { |
| 1012 | if (!code_constant.is_null()) { |
| 1013 | mov(r3, Operand(code_constant)); |
| 1014 | add(r3, r3, Operand(Code::kHeaderSize - kHeapObjectTag)); |
| 1015 | } |
| 1016 | |
| 1017 | Handle<Code> adaptor = |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 1018 | isolate()->builtins()->ArgumentsAdaptorTrampoline(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1019 | if (flag == CALL_FUNCTION) { |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 1020 | call_wrapper.BeforeCall(CallSize(adaptor)); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1021 | SetCallKind(r5, call_kind); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 1022 | Call(adaptor); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1023 | call_wrapper.AfterCall(); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1024 | if (!*definitely_mismatches) { |
| 1025 | b(done); |
| 1026 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1027 | } else { |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1028 | SetCallKind(r5, call_kind); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1029 | Jump(adaptor, RelocInfo::CODE_TARGET); |
| 1030 | } |
| 1031 | bind(®ular_invoke); |
| 1032 | } |
| 1033 | } |
| 1034 | |
| 1035 | |
| 1036 | void MacroAssembler::InvokeCode(Register code, |
| 1037 | const ParameterCount& expected, |
| 1038 | const ParameterCount& actual, |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1039 | InvokeFlag flag, |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1040 | const CallWrapper& call_wrapper, |
| 1041 | CallKind call_kind) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1042 | // You can't call a function without a valid frame. |
| 1043 | ASSERT(flag == JUMP_FUNCTION || has_frame()); |
| 1044 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1045 | Label done; |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1046 | bool definitely_mismatches = false; |
| 1047 | InvokePrologue(expected, actual, Handle<Code>::null(), code, |
| 1048 | &done, &definitely_mismatches, flag, |
Ben Murdoch | 85b7179 | 2012-04-11 18:30:58 +0100 | [diff] [blame] | 1049 | call_wrapper, call_kind); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1050 | if (!definitely_mismatches) { |
| 1051 | if (flag == CALL_FUNCTION) { |
| 1052 | call_wrapper.BeforeCall(CallSize(code)); |
| 1053 | SetCallKind(r5, call_kind); |
| 1054 | Call(code); |
| 1055 | call_wrapper.AfterCall(); |
| 1056 | } else { |
| 1057 | ASSERT(flag == JUMP_FUNCTION); |
| 1058 | SetCallKind(r5, call_kind); |
| 1059 | Jump(code); |
| 1060 | } |
Ben Murdoch | 85b7179 | 2012-04-11 18:30:58 +0100 | [diff] [blame] | 1061 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1062 | // Continue here if InvokePrologue does handle the invocation due to |
| 1063 | // mismatched parameter counts. |
| 1064 | bind(&done); |
| 1065 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1066 | } |
| 1067 | |
| 1068 | |
| 1069 | void MacroAssembler::InvokeCode(Handle<Code> code, |
| 1070 | const ParameterCount& expected, |
| 1071 | const ParameterCount& actual, |
| 1072 | RelocInfo::Mode rmode, |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1073 | InvokeFlag flag, |
| 1074 | CallKind call_kind) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1075 | // You can't call a function without a valid frame. |
| 1076 | ASSERT(flag == JUMP_FUNCTION || has_frame()); |
| 1077 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1078 | Label done; |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1079 | bool definitely_mismatches = false; |
| 1080 | InvokePrologue(expected, actual, code, no_reg, |
| 1081 | &done, &definitely_mismatches, flag, |
Ben Murdoch | 85b7179 | 2012-04-11 18:30:58 +0100 | [diff] [blame] | 1082 | NullCallWrapper(), call_kind); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1083 | if (!definitely_mismatches) { |
| 1084 | if (flag == CALL_FUNCTION) { |
| 1085 | SetCallKind(r5, call_kind); |
| 1086 | Call(code, rmode); |
| 1087 | } else { |
| 1088 | SetCallKind(r5, call_kind); |
| 1089 | Jump(code, rmode); |
| 1090 | } |
Ben Murdoch | 85b7179 | 2012-04-11 18:30:58 +0100 | [diff] [blame] | 1091 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1092 | // Continue here if InvokePrologue does handle the invocation due to |
| 1093 | // mismatched parameter counts. |
| 1094 | bind(&done); |
| 1095 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1096 | } |
| 1097 | |
| 1098 | |
| 1099 | void MacroAssembler::InvokeFunction(Register fun, |
| 1100 | const ParameterCount& actual, |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 1101 | InvokeFlag flag, |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1102 | const CallWrapper& call_wrapper, |
| 1103 | CallKind call_kind) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1104 | // You can't call a function without a valid frame. |
| 1105 | ASSERT(flag == JUMP_FUNCTION || has_frame()); |
| 1106 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1107 | // Contract with called JS functions requires that function is passed in r1. |
| 1108 | ASSERT(fun.is(r1)); |
| 1109 | |
| 1110 | Register expected_reg = r2; |
| 1111 | Register code_reg = r3; |
| 1112 | |
| 1113 | ldr(code_reg, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset)); |
| 1114 | ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset)); |
| 1115 | ldr(expected_reg, |
| 1116 | FieldMemOperand(code_reg, |
| 1117 | SharedFunctionInfo::kFormalParameterCountOffset)); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 1118 | mov(expected_reg, Operand(expected_reg, ASR, kSmiTagSize)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1119 | ldr(code_reg, |
Steve Block | 791712a | 2010-08-27 10:21:07 +0100 | [diff] [blame] | 1120 | FieldMemOperand(r1, JSFunction::kCodeEntryOffset)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1121 | |
| 1122 | ParameterCount expected(expected_reg); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1123 | InvokeCode(code_reg, expected, actual, flag, call_wrapper, call_kind); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1124 | } |
| 1125 | |
| 1126 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1127 | void MacroAssembler::InvokeFunction(Handle<JSFunction> function, |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 1128 | const ParameterCount& actual, |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1129 | InvokeFlag flag, |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1130 | const CallWrapper& call_wrapper, |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1131 | CallKind call_kind) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1132 | // You can't call a function without a valid frame. |
| 1133 | ASSERT(flag == JUMP_FUNCTION || has_frame()); |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 1134 | |
| 1135 | // Get the function and setup the context. |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1136 | LoadHeapObject(r1, function); |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 1137 | ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset)); |
| 1138 | |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 1139 | ParameterCount expected(function->shared()->formal_parameter_count()); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1140 | // We call indirectly through the code field in the function to |
| 1141 | // allow recompilation to take effect without changing any of the |
| 1142 | // call sites. |
| 1143 | ldr(r3, FieldMemOperand(r1, JSFunction::kCodeEntryOffset)); |
| 1144 | InvokeCode(r3, expected, actual, flag, call_wrapper, call_kind); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1145 | } |
| 1146 | |
| 1147 | |
| 1148 | void MacroAssembler::IsObjectJSObjectType(Register heap_object, |
| 1149 | Register map, |
| 1150 | Register scratch, |
| 1151 | Label* fail) { |
| 1152 | ldr(map, FieldMemOperand(heap_object, HeapObject::kMapOffset)); |
| 1153 | IsInstanceJSObjectType(map, scratch, fail); |
| 1154 | } |
| 1155 | |
| 1156 | |
| 1157 | void MacroAssembler::IsInstanceJSObjectType(Register map, |
| 1158 | Register scratch, |
| 1159 | Label* fail) { |
| 1160 | ldrb(scratch, FieldMemOperand(map, Map::kInstanceTypeOffset)); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 1161 | cmp(scratch, Operand(FIRST_NONCALLABLE_SPEC_OBJECT_TYPE)); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1162 | b(lt, fail); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 1163 | cmp(scratch, Operand(LAST_NONCALLABLE_SPEC_OBJECT_TYPE)); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1164 | b(gt, fail); |
| 1165 | } |
| 1166 | |
| 1167 | |
| 1168 | void MacroAssembler::IsObjectJSStringType(Register object, |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1169 | Register scratch, |
| 1170 | Label* fail) { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1171 | ASSERT(kNotStringTag != 0); |
| 1172 | |
| 1173 | ldr(scratch, FieldMemOperand(object, HeapObject::kMapOffset)); |
| 1174 | ldrb(scratch, FieldMemOperand(scratch, Map::kInstanceTypeOffset)); |
| 1175 | tst(scratch, Operand(kIsNotStringMask)); |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 1176 | b(ne, fail); |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 1177 | } |
| 1178 | |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 1179 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1180 | #ifdef ENABLE_DEBUGGER_SUPPORT |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 1181 | void MacroAssembler::DebugBreak() { |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 1182 | mov(r0, Operand(0, RelocInfo::NONE)); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 1183 | mov(r1, Operand(ExternalReference(Runtime::kDebugBreak, isolate()))); |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 1184 | CEntryStub ces(1); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1185 | ASSERT(AllowThisStubCall(&ces)); |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 1186 | Call(ces.GetCode(), RelocInfo::DEBUG_BREAK); |
| 1187 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1188 | #endif |
| 1189 | |
| 1190 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1191 | void MacroAssembler::PushTryHandler(StackHandler::Kind kind, |
| 1192 | int handler_index) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1193 | // Adjust this code if not the case. |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1194 | STATIC_ASSERT(StackHandlerConstants::kSize == 5 * kPointerSize); |
| 1195 | STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0 * kPointerSize); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1196 | STATIC_ASSERT(StackHandlerConstants::kCodeOffset == 1 * kPointerSize); |
| 1197 | STATIC_ASSERT(StackHandlerConstants::kStateOffset == 2 * kPointerSize); |
| 1198 | STATIC_ASSERT(StackHandlerConstants::kContextOffset == 3 * kPointerSize); |
| 1199 | STATIC_ASSERT(StackHandlerConstants::kFPOffset == 4 * kPointerSize); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1200 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1201 | // For the JSEntry handler, we must preserve r0-r4, r5-r7 are available. |
| 1202 | // We will build up the handler from the bottom by pushing on the stack. |
| 1203 | // Set up the code object (r5) and the state (r6) for pushing. |
| 1204 | unsigned state = |
| 1205 | StackHandler::IndexField::encode(handler_index) | |
| 1206 | StackHandler::KindField::encode(kind); |
| 1207 | mov(r5, Operand(CodeObject())); |
| 1208 | mov(r6, Operand(state)); |
| 1209 | |
| 1210 | // Push the frame pointer, context, state, and code object. |
| 1211 | if (kind == StackHandler::JS_ENTRY) { |
| 1212 | mov(r7, Operand(Smi::FromInt(0))); // Indicates no context. |
| 1213 | mov(ip, Operand(0, RelocInfo::NONE)); // NULL frame pointer. |
| 1214 | stm(db_w, sp, r5.bit() | r6.bit() | r7.bit() | ip.bit()); |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame] | 1215 | } else { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1216 | stm(db_w, sp, r5.bit() | r6.bit() | cp.bit() | fp.bit()); |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1217 | } |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1218 | |
| 1219 | // Link the current handler as the next handler. |
| 1220 | mov(r6, Operand(ExternalReference(Isolate::kHandlerAddress, isolate()))); |
| 1221 | ldr(r5, MemOperand(r6)); |
| 1222 | push(r5); |
| 1223 | // Set this new handler as the current one. |
| 1224 | str(sp, MemOperand(r6)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1225 | } |
| 1226 | |
| 1227 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 1228 | void MacroAssembler::PopTryHandler() { |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1229 | STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0); |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 1230 | pop(r1); |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 1231 | mov(ip, Operand(ExternalReference(Isolate::kHandlerAddress, isolate()))); |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 1232 | add(sp, sp, Operand(StackHandlerConstants::kSize - kPointerSize)); |
| 1233 | str(r1, MemOperand(ip)); |
| 1234 | } |
| 1235 | |
| 1236 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1237 | void MacroAssembler::JumpToHandlerEntry() { |
| 1238 | // Compute the handler entry address and jump to it. The handler table is |
| 1239 | // a fixed array of (smi-tagged) code offsets. |
| 1240 | // r0 = exception, r1 = code object, r2 = state. |
| 1241 | ldr(r3, FieldMemOperand(r1, Code::kHandlerTableOffset)); // Handler table. |
| 1242 | add(r3, r3, Operand(FixedArray::kHeaderSize - kHeapObjectTag)); |
| 1243 | mov(r2, Operand(r2, LSR, StackHandler::kKindWidth)); // Handler index. |
| 1244 | ldr(r2, MemOperand(r3, r2, LSL, kPointerSizeLog2)); // Smi-tagged offset. |
| 1245 | add(r1, r1, Operand(Code::kHeaderSize - kHeapObjectTag)); // Code start. |
| 1246 | add(pc, r1, Operand(r2, ASR, kSmiTagSize)); // Jump. |
| 1247 | } |
| 1248 | |
| 1249 | |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1250 | void MacroAssembler::Throw(Register value) { |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1251 | // Adjust this code if not the case. |
| 1252 | STATIC_ASSERT(StackHandlerConstants::kSize == 5 * kPointerSize); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1253 | STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0); |
| 1254 | STATIC_ASSERT(StackHandlerConstants::kCodeOffset == 1 * kPointerSize); |
| 1255 | STATIC_ASSERT(StackHandlerConstants::kStateOffset == 2 * kPointerSize); |
| 1256 | STATIC_ASSERT(StackHandlerConstants::kContextOffset == 3 * kPointerSize); |
| 1257 | STATIC_ASSERT(StackHandlerConstants::kFPOffset == 4 * kPointerSize); |
| 1258 | |
| 1259 | // The exception is expected in r0. |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1260 | if (!value.is(r0)) { |
| 1261 | mov(r0, value); |
| 1262 | } |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1263 | // Drop the stack pointer to the top of the top handler. |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 1264 | mov(r3, Operand(ExternalReference(Isolate::kHandlerAddress, isolate()))); |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1265 | ldr(sp, MemOperand(r3)); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1266 | // Restore the next handler. |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1267 | pop(r2); |
| 1268 | str(r2, MemOperand(r3)); |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1269 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1270 | // Get the code object (r1) and state (r2). Restore the context and frame |
| 1271 | // pointer. |
| 1272 | ldm(ia_w, sp, r1.bit() | r2.bit() | cp.bit() | fp.bit()); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1273 | |
| 1274 | // If the handler is a JS frame, restore the context to the frame. |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1275 | // (kind == ENTRY) == (fp == 0) == (cp == 0), so we could test either fp |
| 1276 | // or cp. |
| 1277 | tst(cp, cp); |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1278 | str(cp, MemOperand(fp, StandardFrameConstants::kContextOffset), ne); |
| 1279 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1280 | JumpToHandlerEntry(); |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1281 | } |
| 1282 | |
| 1283 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1284 | void MacroAssembler::ThrowUncatchable(Register value) { |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1285 | // Adjust this code if not the case. |
Ben Murdoch | 69a99ed | 2011-11-30 16:03:39 +0000 | [diff] [blame] | 1286 | STATIC_ASSERT(StackHandlerConstants::kSize == 5 * kPointerSize); |
| 1287 | STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0 * kPointerSize); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1288 | STATIC_ASSERT(StackHandlerConstants::kCodeOffset == 1 * kPointerSize); |
| 1289 | STATIC_ASSERT(StackHandlerConstants::kStateOffset == 2 * kPointerSize); |
| 1290 | STATIC_ASSERT(StackHandlerConstants::kContextOffset == 3 * kPointerSize); |
| 1291 | STATIC_ASSERT(StackHandlerConstants::kFPOffset == 4 * kPointerSize); |
| 1292 | |
| 1293 | // The exception is expected in r0. |
Ben Murdoch | 5d4cdbf | 2012-04-11 10:23:59 +0100 | [diff] [blame] | 1294 | if (!value.is(r0)) { |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1295 | mov(r0, value); |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1296 | } |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1297 | // Drop the stack pointer to the top of the top stack handler. |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1298 | mov(r3, Operand(ExternalReference(Isolate::kHandlerAddress, isolate()))); |
| 1299 | ldr(sp, MemOperand(r3)); |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1300 | |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1301 | // Unwind the handlers until the ENTRY handler is found. |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1302 | Label fetch_next, check_kind; |
| 1303 | jmp(&check_kind); |
| 1304 | bind(&fetch_next); |
| 1305 | ldr(sp, MemOperand(sp, StackHandlerConstants::kNextOffset)); |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1306 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1307 | bind(&check_kind); |
| 1308 | STATIC_ASSERT(StackHandler::JS_ENTRY == 0); |
| 1309 | ldr(r2, MemOperand(sp, StackHandlerConstants::kStateOffset)); |
| 1310 | tst(r2, Operand(StackHandler::KindField::kMask)); |
| 1311 | b(ne, &fetch_next); |
| 1312 | |
| 1313 | // Set the top handler address to next handler past the top ENTRY handler. |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1314 | pop(r2); |
| 1315 | str(r2, MemOperand(r3)); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1316 | // Get the code object (r1) and state (r2). Clear the context and frame |
| 1317 | // pointer (0 was saved in the handler). |
| 1318 | ldm(ia_w, sp, r1.bit() | r2.bit() | cp.bit() | fp.bit()); |
Ben Murdoch | 592a9fc | 2012-03-05 11:04:45 +0000 | [diff] [blame] | 1319 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1320 | JumpToHandlerEntry(); |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1321 | } |
| 1322 | |
| 1323 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1324 | void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg, |
| 1325 | Register scratch, |
| 1326 | Label* miss) { |
| 1327 | Label same_contexts; |
| 1328 | |
| 1329 | ASSERT(!holder_reg.is(scratch)); |
| 1330 | ASSERT(!holder_reg.is(ip)); |
| 1331 | ASSERT(!scratch.is(ip)); |
| 1332 | |
| 1333 | // Load current lexical context from the stack frame. |
| 1334 | ldr(scratch, MemOperand(fp, StandardFrameConstants::kContextOffset)); |
| 1335 | // In debug mode, make sure the lexical context is set. |
| 1336 | #ifdef DEBUG |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 1337 | cmp(scratch, Operand(0, RelocInfo::NONE)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1338 | Check(ne, "we should not have an empty lexical context"); |
| 1339 | #endif |
| 1340 | |
| 1341 | // Load the global context of the current context. |
| 1342 | int offset = Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize; |
| 1343 | ldr(scratch, FieldMemOperand(scratch, offset)); |
| 1344 | ldr(scratch, FieldMemOperand(scratch, GlobalObject::kGlobalContextOffset)); |
| 1345 | |
| 1346 | // Check the context is a global context. |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 1347 | if (emit_debug_code()) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1348 | // TODO(119): avoid push(holder_reg)/pop(holder_reg) |
| 1349 | // Cannot use ip as a temporary in this verification code. Due to the fact |
| 1350 | // that ip is clobbered as part of cmp with an object Operand. |
| 1351 | push(holder_reg); // Temporarily save holder on the stack. |
| 1352 | // Read the first word and compare to the global_context_map. |
| 1353 | ldr(holder_reg, FieldMemOperand(scratch, HeapObject::kMapOffset)); |
| 1354 | LoadRoot(ip, Heap::kGlobalContextMapRootIndex); |
| 1355 | cmp(holder_reg, ip); |
| 1356 | Check(eq, "JSGlobalObject::global_context should be a global context."); |
| 1357 | pop(holder_reg); // Restore holder. |
| 1358 | } |
| 1359 | |
| 1360 | // Check if both contexts are the same. |
| 1361 | ldr(ip, FieldMemOperand(holder_reg, JSGlobalProxy::kContextOffset)); |
| 1362 | cmp(scratch, Operand(ip)); |
| 1363 | b(eq, &same_contexts); |
| 1364 | |
| 1365 | // Check the context is a global context. |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 1366 | if (emit_debug_code()) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1367 | // TODO(119): avoid push(holder_reg)/pop(holder_reg) |
| 1368 | // Cannot use ip as a temporary in this verification code. Due to the fact |
| 1369 | // that ip is clobbered as part of cmp with an object Operand. |
| 1370 | push(holder_reg); // Temporarily save holder on the stack. |
| 1371 | mov(holder_reg, ip); // Move ip to its holding place. |
| 1372 | LoadRoot(ip, Heap::kNullValueRootIndex); |
| 1373 | cmp(holder_reg, ip); |
| 1374 | Check(ne, "JSGlobalProxy::context() should not be null."); |
| 1375 | |
| 1376 | ldr(holder_reg, FieldMemOperand(holder_reg, HeapObject::kMapOffset)); |
| 1377 | LoadRoot(ip, Heap::kGlobalContextMapRootIndex); |
| 1378 | cmp(holder_reg, ip); |
| 1379 | Check(eq, "JSGlobalObject::global_context should be a global context."); |
| 1380 | // Restore ip is not needed. ip is reloaded below. |
| 1381 | pop(holder_reg); // Restore holder. |
| 1382 | // Restore ip to holder's context. |
| 1383 | ldr(ip, FieldMemOperand(holder_reg, JSGlobalProxy::kContextOffset)); |
| 1384 | } |
| 1385 | |
| 1386 | // Check that the security token in the calling global object is |
| 1387 | // compatible with the security token in the receiving global |
| 1388 | // object. |
| 1389 | int token_offset = Context::kHeaderSize + |
| 1390 | Context::SECURITY_TOKEN_INDEX * kPointerSize; |
| 1391 | |
| 1392 | ldr(scratch, FieldMemOperand(scratch, token_offset)); |
| 1393 | ldr(ip, FieldMemOperand(ip, token_offset)); |
| 1394 | cmp(scratch, Operand(ip)); |
| 1395 | b(ne, miss); |
| 1396 | |
| 1397 | bind(&same_contexts); |
| 1398 | } |
| 1399 | |
| 1400 | |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 1401 | void MacroAssembler::GetNumberHash(Register t0, Register scratch) { |
| 1402 | // First of all we assign the hash seed to scratch. |
| 1403 | LoadRoot(scratch, Heap::kHashSeedRootIndex); |
| 1404 | SmiUntag(scratch); |
| 1405 | |
| 1406 | // Xor original key with a seed. |
| 1407 | eor(t0, t0, Operand(scratch)); |
| 1408 | |
| 1409 | // Compute the hash code from the untagged key. This must be kept in sync |
| 1410 | // with ComputeIntegerHash in utils.h. |
| 1411 | // |
| 1412 | // hash = ~hash + (hash << 15); |
| 1413 | mvn(scratch, Operand(t0)); |
| 1414 | add(t0, scratch, Operand(t0, LSL, 15)); |
| 1415 | // hash = hash ^ (hash >> 12); |
| 1416 | eor(t0, t0, Operand(t0, LSR, 12)); |
| 1417 | // hash = hash + (hash << 2); |
| 1418 | add(t0, t0, Operand(t0, LSL, 2)); |
| 1419 | // hash = hash ^ (hash >> 4); |
| 1420 | eor(t0, t0, Operand(t0, LSR, 4)); |
| 1421 | // hash = hash * 2057; |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1422 | mov(scratch, Operand(t0, LSL, 11)); |
| 1423 | add(t0, t0, Operand(t0, LSL, 3)); |
| 1424 | add(t0, t0, scratch); |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 1425 | // hash = hash ^ (hash >> 16); |
| 1426 | eor(t0, t0, Operand(t0, LSR, 16)); |
| 1427 | } |
| 1428 | |
| 1429 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 1430 | void MacroAssembler::LoadFromNumberDictionary(Label* miss, |
| 1431 | Register elements, |
| 1432 | Register key, |
| 1433 | Register result, |
| 1434 | Register t0, |
| 1435 | Register t1, |
| 1436 | Register t2) { |
| 1437 | // Register use: |
| 1438 | // |
| 1439 | // elements - holds the slow-case elements of the receiver on entry. |
| 1440 | // Unchanged unless 'result' is the same register. |
| 1441 | // |
| 1442 | // key - holds the smi key on entry. |
| 1443 | // Unchanged unless 'result' is the same register. |
| 1444 | // |
| 1445 | // result - holds the result on exit if the load succeeded. |
| 1446 | // Allowed to be the same as 'key' or 'result'. |
| 1447 | // Unchanged on bailout so 'key' or 'result' can be used |
| 1448 | // in further computation. |
| 1449 | // |
| 1450 | // Scratch registers: |
| 1451 | // |
| 1452 | // t0 - holds the untagged key on entry and holds the hash once computed. |
| 1453 | // |
| 1454 | // t1 - used to hold the capacity mask of the dictionary |
| 1455 | // |
| 1456 | // t2 - used for the index into the dictionary. |
| 1457 | Label done; |
| 1458 | |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 1459 | GetNumberHash(t0, t1); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 1460 | |
| 1461 | // Compute the capacity mask. |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 1462 | ldr(t1, FieldMemOperand(elements, SeededNumberDictionary::kCapacityOffset)); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 1463 | mov(t1, Operand(t1, ASR, kSmiTagSize)); // convert smi to int |
| 1464 | sub(t1, t1, Operand(1)); |
| 1465 | |
| 1466 | // Generate an unrolled loop that performs a few probes before giving up. |
| 1467 | static const int kProbes = 4; |
| 1468 | for (int i = 0; i < kProbes; i++) { |
| 1469 | // Use t2 for index calculations and keep the hash intact in t0. |
| 1470 | mov(t2, t0); |
| 1471 | // Compute the masked index: (hash + i + i * i) & mask. |
| 1472 | if (i > 0) { |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 1473 | add(t2, t2, Operand(SeededNumberDictionary::GetProbeOffset(i))); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 1474 | } |
| 1475 | and_(t2, t2, Operand(t1)); |
| 1476 | |
| 1477 | // Scale the index by multiplying by the element size. |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 1478 | ASSERT(SeededNumberDictionary::kEntrySize == 3); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 1479 | add(t2, t2, Operand(t2, LSL, 1)); // t2 = t2 * 3 |
| 1480 | |
| 1481 | // Check if the key is identical to the name. |
| 1482 | add(t2, elements, Operand(t2, LSL, kPointerSizeLog2)); |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 1483 | ldr(ip, FieldMemOperand(t2, SeededNumberDictionary::kElementsStartOffset)); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 1484 | cmp(key, Operand(ip)); |
| 1485 | if (i != kProbes - 1) { |
| 1486 | b(eq, &done); |
| 1487 | } else { |
| 1488 | b(ne, miss); |
| 1489 | } |
| 1490 | } |
| 1491 | |
| 1492 | bind(&done); |
| 1493 | // Check that the value is a normal property. |
| 1494 | // t2: elements + (index * kPointerSize) |
| 1495 | const int kDetailsOffset = |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 1496 | SeededNumberDictionary::kElementsStartOffset + 2 * kPointerSize; |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 1497 | ldr(t1, FieldMemOperand(t2, kDetailsOffset)); |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 1498 | tst(t1, Operand(Smi::FromInt(PropertyDetails::TypeField::kMask))); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 1499 | b(ne, miss); |
| 1500 | |
| 1501 | // Get the value at the masked, scaled index and return. |
| 1502 | const int kValueOffset = |
Ben Murdoch | c7cc028 | 2012-03-05 14:35:55 +0000 | [diff] [blame] | 1503 | SeededNumberDictionary::kElementsStartOffset + kPointerSize; |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 1504 | ldr(result, FieldMemOperand(t2, kValueOffset)); |
| 1505 | } |
| 1506 | |
| 1507 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1508 | void MacroAssembler::AllocateInNewSpace(int object_size, |
| 1509 | Register result, |
| 1510 | Register scratch1, |
| 1511 | Register scratch2, |
| 1512 | Label* gc_required, |
| 1513 | AllocationFlags flags) { |
John Reck | 5913587 | 2010-11-02 12:39:01 -0700 | [diff] [blame] | 1514 | if (!FLAG_inline_new) { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 1515 | if (emit_debug_code()) { |
John Reck | 5913587 | 2010-11-02 12:39:01 -0700 | [diff] [blame] | 1516 | // Trash the registers to simulate an allocation failure. |
| 1517 | mov(result, Operand(0x7091)); |
| 1518 | mov(scratch1, Operand(0x7191)); |
| 1519 | mov(scratch2, Operand(0x7291)); |
| 1520 | } |
| 1521 | jmp(gc_required); |
| 1522 | return; |
| 1523 | } |
| 1524 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1525 | ASSERT(!result.is(scratch1)); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1526 | ASSERT(!result.is(scratch2)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1527 | ASSERT(!scratch1.is(scratch2)); |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1528 | ASSERT(!scratch1.is(ip)); |
| 1529 | ASSERT(!scratch2.is(ip)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1530 | |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 1531 | // Make object size into bytes. |
| 1532 | if ((flags & SIZE_IN_WORDS) != 0) { |
| 1533 | object_size *= kPointerSize; |
| 1534 | } |
| 1535 | ASSERT_EQ(0, object_size & kObjectAlignmentMask); |
| 1536 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1537 | // Check relative positions of allocation top and limit addresses. |
| 1538 | // The values must be adjacent in memory to allow the use of LDM. |
| 1539 | // Also, assert that the registers are numbered such that the values |
| 1540 | // are loaded in the correct order. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1541 | ExternalReference new_space_allocation_top = |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 1542 | ExternalReference::new_space_allocation_top_address(isolate()); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1543 | ExternalReference new_space_allocation_limit = |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 1544 | ExternalReference::new_space_allocation_limit_address(isolate()); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1545 | intptr_t top = |
| 1546 | reinterpret_cast<intptr_t>(new_space_allocation_top.address()); |
| 1547 | intptr_t limit = |
| 1548 | reinterpret_cast<intptr_t>(new_space_allocation_limit.address()); |
| 1549 | ASSERT((limit - top) == kPointerSize); |
| 1550 | ASSERT(result.code() < ip.code()); |
| 1551 | |
| 1552 | // Set up allocation top address and object size registers. |
| 1553 | Register topaddr = scratch1; |
| 1554 | Register obj_size_reg = scratch2; |
| 1555 | mov(topaddr, Operand(new_space_allocation_top)); |
| 1556 | mov(obj_size_reg, Operand(object_size)); |
| 1557 | |
| 1558 | // This code stores a temporary value in ip. This is OK, as the code below |
| 1559 | // does not need ip for implicit literal generation. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1560 | if ((flags & RESULT_CONTAINS_TOP) == 0) { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1561 | // Load allocation top into result and allocation limit into ip. |
| 1562 | ldm(ia, topaddr, result.bit() | ip.bit()); |
| 1563 | } else { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 1564 | if (emit_debug_code()) { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1565 | // Assert that result actually contains top on entry. ip is used |
| 1566 | // immediately below so this use of ip does not cause difference with |
| 1567 | // respect to register content between debug and release mode. |
| 1568 | ldr(ip, MemOperand(topaddr)); |
| 1569 | cmp(result, ip); |
| 1570 | Check(eq, "Unexpected allocation top"); |
| 1571 | } |
| 1572 | // Load allocation limit into ip. Result already contains allocation top. |
| 1573 | ldr(ip, MemOperand(topaddr, limit - top)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1574 | } |
| 1575 | |
| 1576 | // Calculate new top and bail out if new space is exhausted. Use result |
| 1577 | // to calculate the new top. |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 1578 | add(scratch2, result, Operand(obj_size_reg), SetCC); |
| 1579 | b(cs, gc_required); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1580 | cmp(scratch2, Operand(ip)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1581 | b(hi, gc_required); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1582 | str(scratch2, MemOperand(topaddr)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1583 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1584 | // Tag object if requested. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1585 | if ((flags & TAG_OBJECT) != 0) { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1586 | add(result, result, Operand(kHeapObjectTag)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1587 | } |
| 1588 | } |
| 1589 | |
| 1590 | |
| 1591 | void MacroAssembler::AllocateInNewSpace(Register object_size, |
| 1592 | Register result, |
| 1593 | Register scratch1, |
| 1594 | Register scratch2, |
| 1595 | Label* gc_required, |
| 1596 | AllocationFlags flags) { |
John Reck | 5913587 | 2010-11-02 12:39:01 -0700 | [diff] [blame] | 1597 | if (!FLAG_inline_new) { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 1598 | if (emit_debug_code()) { |
John Reck | 5913587 | 2010-11-02 12:39:01 -0700 | [diff] [blame] | 1599 | // Trash the registers to simulate an allocation failure. |
| 1600 | mov(result, Operand(0x7091)); |
| 1601 | mov(scratch1, Operand(0x7191)); |
| 1602 | mov(scratch2, Operand(0x7291)); |
| 1603 | } |
| 1604 | jmp(gc_required); |
| 1605 | return; |
| 1606 | } |
| 1607 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1608 | // Assert that the register arguments are different and that none of |
| 1609 | // them are ip. ip is used explicitly in the code generated below. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1610 | ASSERT(!result.is(scratch1)); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1611 | ASSERT(!result.is(scratch2)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1612 | ASSERT(!scratch1.is(scratch2)); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1613 | ASSERT(!object_size.is(ip)); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1614 | ASSERT(!result.is(ip)); |
| 1615 | ASSERT(!scratch1.is(ip)); |
| 1616 | ASSERT(!scratch2.is(ip)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1617 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1618 | // Check relative positions of allocation top and limit addresses. |
| 1619 | // The values must be adjacent in memory to allow the use of LDM. |
| 1620 | // Also, assert that the registers are numbered such that the values |
| 1621 | // are loaded in the correct order. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1622 | ExternalReference new_space_allocation_top = |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 1623 | ExternalReference::new_space_allocation_top_address(isolate()); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1624 | ExternalReference new_space_allocation_limit = |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 1625 | ExternalReference::new_space_allocation_limit_address(isolate()); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1626 | intptr_t top = |
| 1627 | reinterpret_cast<intptr_t>(new_space_allocation_top.address()); |
| 1628 | intptr_t limit = |
| 1629 | reinterpret_cast<intptr_t>(new_space_allocation_limit.address()); |
| 1630 | ASSERT((limit - top) == kPointerSize); |
| 1631 | ASSERT(result.code() < ip.code()); |
| 1632 | |
| 1633 | // Set up allocation top address. |
| 1634 | Register topaddr = scratch1; |
| 1635 | mov(topaddr, Operand(new_space_allocation_top)); |
| 1636 | |
| 1637 | // This code stores a temporary value in ip. This is OK, as the code below |
| 1638 | // does not need ip for implicit literal generation. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1639 | if ((flags & RESULT_CONTAINS_TOP) == 0) { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1640 | // Load allocation top into result and allocation limit into ip. |
| 1641 | ldm(ia, topaddr, result.bit() | ip.bit()); |
| 1642 | } else { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 1643 | if (emit_debug_code()) { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1644 | // Assert that result actually contains top on entry. ip is used |
| 1645 | // immediately below so this use of ip does not cause difference with |
| 1646 | // respect to register content between debug and release mode. |
| 1647 | ldr(ip, MemOperand(topaddr)); |
| 1648 | cmp(result, ip); |
| 1649 | Check(eq, "Unexpected allocation top"); |
| 1650 | } |
| 1651 | // Load allocation limit into ip. Result already contains allocation top. |
| 1652 | ldr(ip, MemOperand(topaddr, limit - top)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1653 | } |
| 1654 | |
| 1655 | // Calculate new top and bail out if new space is exhausted. Use result |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1656 | // to calculate the new top. Object size may be in words so a shift is |
| 1657 | // required to get the number of bytes. |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 1658 | if ((flags & SIZE_IN_WORDS) != 0) { |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 1659 | add(scratch2, result, Operand(object_size, LSL, kPointerSizeLog2), SetCC); |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 1660 | } else { |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 1661 | add(scratch2, result, Operand(object_size), SetCC); |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 1662 | } |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 1663 | b(cs, gc_required); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1664 | cmp(scratch2, Operand(ip)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1665 | b(hi, gc_required); |
| 1666 | |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1667 | // Update allocation top. result temporarily holds the new top. |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 1668 | if (emit_debug_code()) { |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1669 | tst(scratch2, Operand(kObjectAlignmentMask)); |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1670 | Check(eq, "Unaligned allocation in new space"); |
| 1671 | } |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 1672 | str(scratch2, MemOperand(topaddr)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1673 | |
| 1674 | // Tag object if requested. |
| 1675 | if ((flags & TAG_OBJECT) != 0) { |
| 1676 | add(result, result, Operand(kHeapObjectTag)); |
| 1677 | } |
| 1678 | } |
| 1679 | |
| 1680 | |
| 1681 | void MacroAssembler::UndoAllocationInNewSpace(Register object, |
| 1682 | Register scratch) { |
| 1683 | ExternalReference new_space_allocation_top = |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 1684 | ExternalReference::new_space_allocation_top_address(isolate()); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1685 | |
| 1686 | // Make sure the object has no tag before resetting top. |
| 1687 | and_(object, object, Operand(~kHeapObjectTagMask)); |
| 1688 | #ifdef DEBUG |
| 1689 | // Check that the object un-allocated is below the current top. |
| 1690 | mov(scratch, Operand(new_space_allocation_top)); |
| 1691 | ldr(scratch, MemOperand(scratch)); |
| 1692 | cmp(object, scratch); |
| 1693 | Check(lt, "Undo allocation of non allocated memory"); |
| 1694 | #endif |
| 1695 | // Write the address of the object to un-allocate as the current top. |
| 1696 | mov(scratch, Operand(new_space_allocation_top)); |
| 1697 | str(object, MemOperand(scratch)); |
| 1698 | } |
| 1699 | |
| 1700 | |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 1701 | void MacroAssembler::AllocateTwoByteString(Register result, |
| 1702 | Register length, |
| 1703 | Register scratch1, |
| 1704 | Register scratch2, |
| 1705 | Register scratch3, |
| 1706 | Label* gc_required) { |
| 1707 | // Calculate the number of bytes needed for the characters in the string while |
| 1708 | // observing object alignment. |
| 1709 | ASSERT((SeqTwoByteString::kHeaderSize & kObjectAlignmentMask) == 0); |
| 1710 | mov(scratch1, Operand(length, LSL, 1)); // Length in bytes, not chars. |
| 1711 | add(scratch1, scratch1, |
| 1712 | Operand(kObjectAlignmentMask + SeqTwoByteString::kHeaderSize)); |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 1713 | and_(scratch1, scratch1, Operand(~kObjectAlignmentMask)); |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 1714 | |
| 1715 | // Allocate two-byte string in new space. |
| 1716 | AllocateInNewSpace(scratch1, |
| 1717 | result, |
| 1718 | scratch2, |
| 1719 | scratch3, |
| 1720 | gc_required, |
| 1721 | TAG_OBJECT); |
| 1722 | |
| 1723 | // Set the map, length and hash field. |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1724 | InitializeNewString(result, |
| 1725 | length, |
| 1726 | Heap::kStringMapRootIndex, |
| 1727 | scratch1, |
| 1728 | scratch2); |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 1729 | } |
| 1730 | |
| 1731 | |
| 1732 | void MacroAssembler::AllocateAsciiString(Register result, |
| 1733 | Register length, |
| 1734 | Register scratch1, |
| 1735 | Register scratch2, |
| 1736 | Register scratch3, |
| 1737 | Label* gc_required) { |
| 1738 | // Calculate the number of bytes needed for the characters in the string while |
| 1739 | // observing object alignment. |
| 1740 | ASSERT((SeqAsciiString::kHeaderSize & kObjectAlignmentMask) == 0); |
| 1741 | ASSERT(kCharSize == 1); |
| 1742 | add(scratch1, length, |
| 1743 | Operand(kObjectAlignmentMask + SeqAsciiString::kHeaderSize)); |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 1744 | and_(scratch1, scratch1, Operand(~kObjectAlignmentMask)); |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 1745 | |
| 1746 | // Allocate ASCII string in new space. |
| 1747 | AllocateInNewSpace(scratch1, |
| 1748 | result, |
| 1749 | scratch2, |
| 1750 | scratch3, |
| 1751 | gc_required, |
| 1752 | TAG_OBJECT); |
| 1753 | |
| 1754 | // Set the map, length and hash field. |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1755 | InitializeNewString(result, |
| 1756 | length, |
| 1757 | Heap::kAsciiStringMapRootIndex, |
| 1758 | scratch1, |
| 1759 | scratch2); |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 1760 | } |
| 1761 | |
| 1762 | |
| 1763 | void MacroAssembler::AllocateTwoByteConsString(Register result, |
| 1764 | Register length, |
| 1765 | Register scratch1, |
| 1766 | Register scratch2, |
| 1767 | Label* gc_required) { |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 1768 | AllocateInNewSpace(ConsString::kSize, |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 1769 | result, |
| 1770 | scratch1, |
| 1771 | scratch2, |
| 1772 | gc_required, |
| 1773 | TAG_OBJECT); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1774 | |
| 1775 | InitializeNewString(result, |
| 1776 | length, |
| 1777 | Heap::kConsStringMapRootIndex, |
| 1778 | scratch1, |
| 1779 | scratch2); |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 1780 | } |
| 1781 | |
| 1782 | |
| 1783 | void MacroAssembler::AllocateAsciiConsString(Register result, |
| 1784 | Register length, |
| 1785 | Register scratch1, |
| 1786 | Register scratch2, |
| 1787 | Label* gc_required) { |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 1788 | AllocateInNewSpace(ConsString::kSize, |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 1789 | result, |
| 1790 | scratch1, |
| 1791 | scratch2, |
| 1792 | gc_required, |
| 1793 | TAG_OBJECT); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1794 | |
| 1795 | InitializeNewString(result, |
| 1796 | length, |
| 1797 | Heap::kConsAsciiStringMapRootIndex, |
| 1798 | scratch1, |
| 1799 | scratch2); |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 1800 | } |
| 1801 | |
| 1802 | |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 1803 | void MacroAssembler::AllocateTwoByteSlicedString(Register result, |
| 1804 | Register length, |
| 1805 | Register scratch1, |
| 1806 | Register scratch2, |
| 1807 | Label* gc_required) { |
| 1808 | AllocateInNewSpace(SlicedString::kSize, |
| 1809 | result, |
| 1810 | scratch1, |
| 1811 | scratch2, |
| 1812 | gc_required, |
| 1813 | TAG_OBJECT); |
| 1814 | |
| 1815 | InitializeNewString(result, |
| 1816 | length, |
| 1817 | Heap::kSlicedStringMapRootIndex, |
| 1818 | scratch1, |
| 1819 | scratch2); |
| 1820 | } |
| 1821 | |
| 1822 | |
| 1823 | void MacroAssembler::AllocateAsciiSlicedString(Register result, |
| 1824 | Register length, |
| 1825 | Register scratch1, |
| 1826 | Register scratch2, |
| 1827 | Label* gc_required) { |
| 1828 | AllocateInNewSpace(SlicedString::kSize, |
| 1829 | result, |
| 1830 | scratch1, |
| 1831 | scratch2, |
| 1832 | gc_required, |
| 1833 | TAG_OBJECT); |
| 1834 | |
| 1835 | InitializeNewString(result, |
| 1836 | length, |
| 1837 | Heap::kSlicedAsciiStringMapRootIndex, |
| 1838 | scratch1, |
| 1839 | scratch2); |
| 1840 | } |
| 1841 | |
| 1842 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1843 | void MacroAssembler::CompareObjectType(Register object, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1844 | Register map, |
| 1845 | Register type_reg, |
| 1846 | InstanceType type) { |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 1847 | ldr(map, FieldMemOperand(object, HeapObject::kMapOffset)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1848 | CompareInstanceType(map, type_reg, type); |
| 1849 | } |
| 1850 | |
| 1851 | |
| 1852 | void MacroAssembler::CompareInstanceType(Register map, |
| 1853 | Register type_reg, |
| 1854 | InstanceType type) { |
| 1855 | ldrb(type_reg, FieldMemOperand(map, Map::kInstanceTypeOffset)); |
| 1856 | cmp(type_reg, Operand(type)); |
| 1857 | } |
| 1858 | |
| 1859 | |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 1860 | void MacroAssembler::CompareRoot(Register obj, |
| 1861 | Heap::RootListIndex index) { |
| 1862 | ASSERT(!obj.is(ip)); |
| 1863 | LoadRoot(ip, index); |
| 1864 | cmp(obj, ip); |
| 1865 | } |
| 1866 | |
| 1867 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 1868 | void MacroAssembler::CheckFastElements(Register map, |
| 1869 | Register scratch, |
| 1870 | Label* fail) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1871 | STATIC_ASSERT(FAST_SMI_ONLY_ELEMENTS == 0); |
| 1872 | STATIC_ASSERT(FAST_ELEMENTS == 1); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 1873 | ldrb(scratch, FieldMemOperand(map, Map::kBitField2Offset)); |
| 1874 | cmp(scratch, Operand(Map::kMaximumBitField2FastElementValue)); |
| 1875 | b(hi, fail); |
| 1876 | } |
| 1877 | |
| 1878 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 1879 | void MacroAssembler::CheckFastObjectElements(Register map, |
| 1880 | Register scratch, |
| 1881 | Label* fail) { |
| 1882 | STATIC_ASSERT(FAST_SMI_ONLY_ELEMENTS == 0); |
| 1883 | STATIC_ASSERT(FAST_ELEMENTS == 1); |
| 1884 | ldrb(scratch, FieldMemOperand(map, Map::kBitField2Offset)); |
| 1885 | cmp(scratch, Operand(Map::kMaximumBitField2FastSmiOnlyElementValue)); |
| 1886 | b(ls, fail); |
| 1887 | cmp(scratch, Operand(Map::kMaximumBitField2FastElementValue)); |
| 1888 | b(hi, fail); |
| 1889 | } |
| 1890 | |
| 1891 | |
| 1892 | void MacroAssembler::CheckFastSmiOnlyElements(Register map, |
| 1893 | Register scratch, |
| 1894 | Label* fail) { |
| 1895 | STATIC_ASSERT(FAST_SMI_ONLY_ELEMENTS == 0); |
| 1896 | ldrb(scratch, FieldMemOperand(map, Map::kBitField2Offset)); |
| 1897 | cmp(scratch, Operand(Map::kMaximumBitField2FastSmiOnlyElementValue)); |
| 1898 | b(hi, fail); |
| 1899 | } |
| 1900 | |
| 1901 | |
| 1902 | void MacroAssembler::StoreNumberToDoubleElements(Register value_reg, |
| 1903 | Register key_reg, |
| 1904 | Register receiver_reg, |
| 1905 | Register elements_reg, |
| 1906 | Register scratch1, |
| 1907 | Register scratch2, |
| 1908 | Register scratch3, |
| 1909 | Register scratch4, |
| 1910 | Label* fail) { |
| 1911 | Label smi_value, maybe_nan, have_double_value, is_nan, done; |
| 1912 | Register mantissa_reg = scratch2; |
| 1913 | Register exponent_reg = scratch3; |
| 1914 | |
| 1915 | // Handle smi values specially. |
| 1916 | JumpIfSmi(value_reg, &smi_value); |
| 1917 | |
| 1918 | // Ensure that the object is a heap number |
| 1919 | CheckMap(value_reg, |
| 1920 | scratch1, |
| 1921 | isolate()->factory()->heap_number_map(), |
| 1922 | fail, |
| 1923 | DONT_DO_SMI_CHECK); |
| 1924 | |
| 1925 | // Check for nan: all NaN values have a value greater (signed) than 0x7ff00000 |
| 1926 | // in the exponent. |
| 1927 | mov(scratch1, Operand(kNaNOrInfinityLowerBoundUpper32)); |
| 1928 | ldr(exponent_reg, FieldMemOperand(value_reg, HeapNumber::kExponentOffset)); |
| 1929 | cmp(exponent_reg, scratch1); |
| 1930 | b(ge, &maybe_nan); |
| 1931 | |
| 1932 | ldr(mantissa_reg, FieldMemOperand(value_reg, HeapNumber::kMantissaOffset)); |
| 1933 | |
| 1934 | bind(&have_double_value); |
| 1935 | add(scratch1, elements_reg, |
| 1936 | Operand(key_reg, LSL, kDoubleSizeLog2 - kSmiTagSize)); |
| 1937 | str(mantissa_reg, FieldMemOperand(scratch1, FixedDoubleArray::kHeaderSize)); |
| 1938 | uint32_t offset = FixedDoubleArray::kHeaderSize + sizeof(kHoleNanLower32); |
| 1939 | str(exponent_reg, FieldMemOperand(scratch1, offset)); |
| 1940 | jmp(&done); |
| 1941 | |
| 1942 | bind(&maybe_nan); |
| 1943 | // Could be NaN or Infinity. If fraction is not zero, it's NaN, otherwise |
| 1944 | // it's an Infinity, and the non-NaN code path applies. |
| 1945 | b(gt, &is_nan); |
| 1946 | ldr(mantissa_reg, FieldMemOperand(value_reg, HeapNumber::kMantissaOffset)); |
| 1947 | cmp(mantissa_reg, Operand(0)); |
| 1948 | b(eq, &have_double_value); |
| 1949 | bind(&is_nan); |
| 1950 | // Load canonical NaN for storing into the double array. |
| 1951 | uint64_t nan_int64 = BitCast<uint64_t>( |
| 1952 | FixedDoubleArray::canonical_not_the_hole_nan_as_double()); |
| 1953 | mov(mantissa_reg, Operand(static_cast<uint32_t>(nan_int64))); |
| 1954 | mov(exponent_reg, Operand(static_cast<uint32_t>(nan_int64 >> 32))); |
| 1955 | jmp(&have_double_value); |
| 1956 | |
| 1957 | bind(&smi_value); |
| 1958 | add(scratch1, elements_reg, |
| 1959 | Operand(FixedDoubleArray::kHeaderSize - kHeapObjectTag)); |
| 1960 | add(scratch1, scratch1, |
| 1961 | Operand(key_reg, LSL, kDoubleSizeLog2 - kSmiTagSize)); |
| 1962 | // scratch1 is now effective address of the double element |
| 1963 | |
| 1964 | FloatingPointHelper::Destination destination; |
| 1965 | if (CpuFeatures::IsSupported(VFP3)) { |
| 1966 | destination = FloatingPointHelper::kVFPRegisters; |
| 1967 | } else { |
| 1968 | destination = FloatingPointHelper::kCoreRegisters; |
| 1969 | } |
| 1970 | |
| 1971 | Register untagged_value = receiver_reg; |
| 1972 | SmiUntag(untagged_value, value_reg); |
| 1973 | FloatingPointHelper::ConvertIntToDouble(this, |
| 1974 | untagged_value, |
| 1975 | destination, |
| 1976 | d0, |
| 1977 | mantissa_reg, |
| 1978 | exponent_reg, |
| 1979 | scratch4, |
| 1980 | s2); |
| 1981 | if (destination == FloatingPointHelper::kVFPRegisters) { |
| 1982 | CpuFeatures::Scope scope(VFP3); |
| 1983 | vstr(d0, scratch1, 0); |
| 1984 | } else { |
| 1985 | str(mantissa_reg, MemOperand(scratch1, 0)); |
| 1986 | str(exponent_reg, MemOperand(scratch1, Register::kSizeInBytes)); |
| 1987 | } |
| 1988 | bind(&done); |
| 1989 | } |
| 1990 | |
| 1991 | |
| 1992 | void MacroAssembler::CompareMap(Register obj, |
| 1993 | Register scratch, |
| 1994 | Handle<Map> map, |
| 1995 | Label* early_success, |
| 1996 | CompareMapMode mode) { |
| 1997 | ldr(scratch, FieldMemOperand(obj, HeapObject::kMapOffset)); |
| 1998 | cmp(scratch, Operand(map)); |
| 1999 | if (mode == ALLOW_ELEMENT_TRANSITION_MAPS) { |
| 2000 | Map* transitioned_fast_element_map( |
| 2001 | map->LookupElementsTransitionMap(FAST_ELEMENTS, NULL)); |
| 2002 | ASSERT(transitioned_fast_element_map == NULL || |
| 2003 | map->elements_kind() != FAST_ELEMENTS); |
| 2004 | if (transitioned_fast_element_map != NULL) { |
| 2005 | b(eq, early_success); |
| 2006 | cmp(scratch, Operand(Handle<Map>(transitioned_fast_element_map))); |
| 2007 | } |
| 2008 | |
| 2009 | Map* transitioned_double_map( |
| 2010 | map->LookupElementsTransitionMap(FAST_DOUBLE_ELEMENTS, NULL)); |
| 2011 | ASSERT(transitioned_double_map == NULL || |
| 2012 | map->elements_kind() == FAST_SMI_ONLY_ELEMENTS); |
| 2013 | if (transitioned_double_map != NULL) { |
| 2014 | b(eq, early_success); |
| 2015 | cmp(scratch, Operand(Handle<Map>(transitioned_double_map))); |
| 2016 | } |
| 2017 | } |
| 2018 | } |
| 2019 | |
| 2020 | |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 2021 | void MacroAssembler::CheckMap(Register obj, |
| 2022 | Register scratch, |
| 2023 | Handle<Map> map, |
| 2024 | Label* fail, |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 2025 | SmiCheckType smi_check_type, |
| 2026 | CompareMapMode mode) { |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 2027 | if (smi_check_type == DO_SMI_CHECK) { |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2028 | JumpIfSmi(obj, fail); |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 2029 | } |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 2030 | |
| 2031 | Label success; |
| 2032 | CompareMap(obj, scratch, map, &success, mode); |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 2033 | b(ne, fail); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 2034 | bind(&success); |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 2035 | } |
| 2036 | |
| 2037 | |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 2038 | void MacroAssembler::CheckMap(Register obj, |
| 2039 | Register scratch, |
| 2040 | Heap::RootListIndex index, |
| 2041 | Label* fail, |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 2042 | SmiCheckType smi_check_type) { |
| 2043 | if (smi_check_type == DO_SMI_CHECK) { |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2044 | JumpIfSmi(obj, fail); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 2045 | } |
| 2046 | ldr(scratch, FieldMemOperand(obj, HeapObject::kMapOffset)); |
| 2047 | LoadRoot(ip, index); |
| 2048 | cmp(scratch, ip); |
| 2049 | b(ne, fail); |
| 2050 | } |
| 2051 | |
| 2052 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 2053 | void MacroAssembler::DispatchMap(Register obj, |
| 2054 | Register scratch, |
| 2055 | Handle<Map> map, |
| 2056 | Handle<Code> success, |
| 2057 | SmiCheckType smi_check_type) { |
| 2058 | Label fail; |
| 2059 | if (smi_check_type == DO_SMI_CHECK) { |
| 2060 | JumpIfSmi(obj, &fail); |
| 2061 | } |
| 2062 | ldr(scratch, FieldMemOperand(obj, HeapObject::kMapOffset)); |
| 2063 | mov(ip, Operand(map)); |
| 2064 | cmp(scratch, ip); |
| 2065 | Jump(success, RelocInfo::CODE_TARGET, eq); |
| 2066 | bind(&fail); |
| 2067 | } |
| 2068 | |
| 2069 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2070 | void MacroAssembler::TryGetFunctionPrototype(Register function, |
| 2071 | Register result, |
| 2072 | Register scratch, |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 2073 | Label* miss, |
| 2074 | bool miss_on_bound_function) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2075 | // Check that the receiver isn't a smi. |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2076 | JumpIfSmi(function, miss); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2077 | |
| 2078 | // Check that the function really is a function. Load map into result reg. |
| 2079 | CompareObjectType(function, result, scratch, JS_FUNCTION_TYPE); |
| 2080 | b(ne, miss); |
| 2081 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 2082 | if (miss_on_bound_function) { |
| 2083 | ldr(scratch, |
| 2084 | FieldMemOperand(function, JSFunction::kSharedFunctionInfoOffset)); |
| 2085 | ldr(scratch, |
| 2086 | FieldMemOperand(scratch, SharedFunctionInfo::kCompilerHintsOffset)); |
| 2087 | tst(scratch, |
| 2088 | Operand(Smi::FromInt(1 << SharedFunctionInfo::kBoundFunction))); |
| 2089 | b(ne, miss); |
| 2090 | } |
| 2091 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2092 | // Make sure that the function has an instance prototype. |
| 2093 | Label non_instance; |
| 2094 | ldrb(scratch, FieldMemOperand(result, Map::kBitFieldOffset)); |
| 2095 | tst(scratch, Operand(1 << Map::kHasNonInstancePrototype)); |
| 2096 | b(ne, &non_instance); |
| 2097 | |
| 2098 | // Get the prototype or initial map from the function. |
| 2099 | ldr(result, |
| 2100 | FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset)); |
| 2101 | |
| 2102 | // If the prototype or initial map is the hole, don't return it and |
| 2103 | // simply miss the cache instead. This will allow us to allocate a |
| 2104 | // prototype object on-demand in the runtime system. |
| 2105 | LoadRoot(ip, Heap::kTheHoleValueRootIndex); |
| 2106 | cmp(result, ip); |
| 2107 | b(eq, miss); |
| 2108 | |
| 2109 | // If the function does not have an initial map, we're done. |
| 2110 | Label done; |
| 2111 | CompareObjectType(result, scratch, scratch, MAP_TYPE); |
| 2112 | b(ne, &done); |
| 2113 | |
| 2114 | // Get the prototype from the initial map. |
| 2115 | ldr(result, FieldMemOperand(result, Map::kPrototypeOffset)); |
| 2116 | jmp(&done); |
| 2117 | |
| 2118 | // Non-instance prototype: Fetch prototype from constructor field |
| 2119 | // in initial map. |
| 2120 | bind(&non_instance); |
| 2121 | ldr(result, FieldMemOperand(result, Map::kConstructorOffset)); |
| 2122 | |
| 2123 | // All done. |
| 2124 | bind(&done); |
| 2125 | } |
| 2126 | |
| 2127 | |
| 2128 | void MacroAssembler::CallStub(CodeStub* stub, Condition cond) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 2129 | ASSERT(AllowThisStubCall(stub)); // Stub calls are not allowed in some stubs. |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 2130 | Call(stub->GetCode(), RelocInfo::CODE_TARGET, kNoASTId, cond); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2131 | } |
| 2132 | |
| 2133 | |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 2134 | void MacroAssembler::TailCallStub(CodeStub* stub, Condition cond) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 2135 | ASSERT(allow_stub_calls_ || stub->CompilingCallsToThisStubIsGCSafe()); |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 2136 | Jump(stub->GetCode(), RelocInfo::CODE_TARGET, cond); |
| 2137 | } |
| 2138 | |
| 2139 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2140 | static int AddressOffset(ExternalReference ref0, ExternalReference ref1) { |
| 2141 | return ref0.address() - ref1.address(); |
| 2142 | } |
| 2143 | |
| 2144 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 2145 | void MacroAssembler::CallApiFunctionAndReturn(ExternalReference function, |
| 2146 | int stack_space) { |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2147 | ExternalReference next_address = |
| 2148 | ExternalReference::handle_scope_next_address(); |
| 2149 | const int kNextOffset = 0; |
| 2150 | const int kLimitOffset = AddressOffset( |
| 2151 | ExternalReference::handle_scope_limit_address(), |
| 2152 | next_address); |
| 2153 | const int kLevelOffset = AddressOffset( |
| 2154 | ExternalReference::handle_scope_level_address(), |
| 2155 | next_address); |
| 2156 | |
| 2157 | // Allocate HandleScope in callee-save registers. |
| 2158 | mov(r7, Operand(next_address)); |
| 2159 | ldr(r4, MemOperand(r7, kNextOffset)); |
| 2160 | ldr(r5, MemOperand(r7, kLimitOffset)); |
| 2161 | ldr(r6, MemOperand(r7, kLevelOffset)); |
| 2162 | add(r6, r6, Operand(1)); |
| 2163 | str(r6, MemOperand(r7, kLevelOffset)); |
| 2164 | |
| 2165 | // Native call returns to the DirectCEntry stub which redirects to the |
| 2166 | // return address pushed on stack (could have moved after GC). |
| 2167 | // DirectCEntry stub itself is generated early and never moves. |
| 2168 | DirectCEntryStub stub; |
| 2169 | stub.GenerateCall(this, function); |
| 2170 | |
| 2171 | Label promote_scheduled_exception; |
| 2172 | Label delete_allocated_handles; |
| 2173 | Label leave_exit_frame; |
| 2174 | |
| 2175 | // If result is non-zero, dereference to get the result value |
| 2176 | // otherwise set it to undefined. |
| 2177 | cmp(r0, Operand(0)); |
| 2178 | LoadRoot(r0, Heap::kUndefinedValueRootIndex, eq); |
| 2179 | ldr(r0, MemOperand(r0), ne); |
| 2180 | |
| 2181 | // No more valid handles (the result handle was the last one). Restore |
| 2182 | // previous handle scope. |
| 2183 | str(r4, MemOperand(r7, kNextOffset)); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 2184 | if (emit_debug_code()) { |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2185 | ldr(r1, MemOperand(r7, kLevelOffset)); |
| 2186 | cmp(r1, r6); |
| 2187 | Check(eq, "Unexpected level after return from api call"); |
| 2188 | } |
| 2189 | sub(r6, r6, Operand(1)); |
| 2190 | str(r6, MemOperand(r7, kLevelOffset)); |
| 2191 | ldr(ip, MemOperand(r7, kLimitOffset)); |
| 2192 | cmp(r5, ip); |
| 2193 | b(ne, &delete_allocated_handles); |
| 2194 | |
| 2195 | // Check if the function scheduled an exception. |
| 2196 | bind(&leave_exit_frame); |
| 2197 | LoadRoot(r4, Heap::kTheHoleValueRootIndex); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 2198 | mov(ip, Operand(ExternalReference::scheduled_exception_address(isolate()))); |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2199 | ldr(r5, MemOperand(ip)); |
| 2200 | cmp(r4, r5); |
| 2201 | b(ne, &promote_scheduled_exception); |
| 2202 | |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 2203 | // LeaveExitFrame expects unwind space to be in a register. |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2204 | mov(r4, Operand(stack_space)); |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 2205 | LeaveExitFrame(false, r4); |
| 2206 | mov(pc, lr); |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2207 | |
| 2208 | bind(&promote_scheduled_exception); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 2209 | TailCallExternalReference( |
| 2210 | ExternalReference(Runtime::kPromoteScheduledException, isolate()), |
| 2211 | 0, |
| 2212 | 1); |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2213 | |
| 2214 | // HandleScope limit has changed. Delete allocated extensions. |
| 2215 | bind(&delete_allocated_handles); |
| 2216 | str(r5, MemOperand(r7, kLimitOffset)); |
| 2217 | mov(r4, r0); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 2218 | PrepareCallCFunction(1, r5); |
| 2219 | mov(r0, Operand(ExternalReference::isolate_address())); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 2220 | CallCFunction( |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 2221 | ExternalReference::delete_handle_scope_extensions(isolate()), 1); |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2222 | mov(r0, r4); |
| 2223 | jmp(&leave_exit_frame); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 2224 | } |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2225 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 2226 | |
| 2227 | bool MacroAssembler::AllowThisStubCall(CodeStub* stub) { |
| 2228 | if (!has_frame_ && stub->SometimesSetsUpAFrame()) return false; |
| 2229 | return allow_stub_calls_ || stub->CompilingCallsToThisStubIsGCSafe(); |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2230 | } |
| 2231 | |
| 2232 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2233 | void MacroAssembler::IllegalOperation(int num_arguments) { |
| 2234 | if (num_arguments > 0) { |
| 2235 | add(sp, sp, Operand(num_arguments * kPointerSize)); |
| 2236 | } |
| 2237 | LoadRoot(r0, Heap::kUndefinedValueRootIndex); |
| 2238 | } |
| 2239 | |
| 2240 | |
Kristian Monsen | 80d68ea | 2010-09-08 11:05:35 +0100 | [diff] [blame] | 2241 | void MacroAssembler::IndexFromHash(Register hash, Register index) { |
| 2242 | // If the hash field contains an array index pick it out. The assert checks |
| 2243 | // that the constants for the maximum number of digits for an array index |
| 2244 | // cached in the hash field and the number of bits reserved for it does not |
| 2245 | // conflict. |
| 2246 | ASSERT(TenToThe(String::kMaxCachedArrayIndexLength) < |
| 2247 | (1 << String::kArrayIndexValueBits)); |
| 2248 | // We want the smi-tagged index in key. kArrayIndexValueMask has zeros in |
| 2249 | // the low kHashShift bits. |
| 2250 | STATIC_ASSERT(kSmiTag == 0); |
| 2251 | Ubfx(hash, hash, String::kHashShift, String::kArrayIndexValueBits); |
| 2252 | mov(index, Operand(hash, LSL, kSmiTagSize)); |
| 2253 | } |
| 2254 | |
| 2255 | |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 2256 | void MacroAssembler::IntegerToDoubleConversionWithVFP3(Register inReg, |
| 2257 | Register outHighReg, |
| 2258 | Register outLowReg) { |
| 2259 | // ARMv7 VFP3 instructions to implement integer to double conversion. |
| 2260 | mov(r7, Operand(inReg, ASR, kSmiTagSize)); |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 2261 | vmov(s15, r7); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 2262 | vcvt_f64_s32(d7, s15); |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 2263 | vmov(outLowReg, outHighReg, d7); |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 2264 | } |
| 2265 | |
| 2266 | |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 2267 | void MacroAssembler::ObjectToDoubleVFPRegister(Register object, |
| 2268 | DwVfpRegister result, |
| 2269 | Register scratch1, |
| 2270 | Register scratch2, |
| 2271 | Register heap_number_map, |
| 2272 | SwVfpRegister scratch3, |
| 2273 | Label* not_number, |
| 2274 | ObjectToDoubleFlags flags) { |
| 2275 | Label done; |
| 2276 | if ((flags & OBJECT_NOT_SMI) == 0) { |
| 2277 | Label not_smi; |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2278 | JumpIfNotSmi(object, ¬_smi); |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 2279 | // Remove smi tag and convert to double. |
| 2280 | mov(scratch1, Operand(object, ASR, kSmiTagSize)); |
| 2281 | vmov(scratch3, scratch1); |
| 2282 | vcvt_f64_s32(result, scratch3); |
| 2283 | b(&done); |
| 2284 | bind(¬_smi); |
| 2285 | } |
| 2286 | // Check for heap number and load double value from it. |
| 2287 | ldr(scratch1, FieldMemOperand(object, HeapObject::kMapOffset)); |
| 2288 | sub(scratch2, object, Operand(kHeapObjectTag)); |
| 2289 | cmp(scratch1, heap_number_map); |
| 2290 | b(ne, not_number); |
| 2291 | if ((flags & AVOID_NANS_AND_INFINITIES) != 0) { |
| 2292 | // If exponent is all ones the number is either a NaN or +/-Infinity. |
| 2293 | ldr(scratch1, FieldMemOperand(object, HeapNumber::kExponentOffset)); |
| 2294 | Sbfx(scratch1, |
| 2295 | scratch1, |
| 2296 | HeapNumber::kExponentShift, |
| 2297 | HeapNumber::kExponentBits); |
| 2298 | // All-one value sign extend to -1. |
| 2299 | cmp(scratch1, Operand(-1)); |
| 2300 | b(eq, not_number); |
| 2301 | } |
| 2302 | vldr(result, scratch2, HeapNumber::kValueOffset); |
| 2303 | bind(&done); |
| 2304 | } |
| 2305 | |
| 2306 | |
| 2307 | void MacroAssembler::SmiToDoubleVFPRegister(Register smi, |
| 2308 | DwVfpRegister value, |
| 2309 | Register scratch1, |
| 2310 | SwVfpRegister scratch2) { |
| 2311 | mov(scratch1, Operand(smi, ASR, kSmiTagSize)); |
| 2312 | vmov(scratch2, scratch1); |
| 2313 | vcvt_f64_s32(value, scratch2); |
| 2314 | } |
| 2315 | |
| 2316 | |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 2317 | // Tries to get a signed int32 out of a double precision floating point heap |
| 2318 | // number. Rounds towards 0. Branch to 'not_int32' if the double is out of the |
| 2319 | // 32bits signed integer range. |
| 2320 | void MacroAssembler::ConvertToInt32(Register source, |
| 2321 | Register dest, |
| 2322 | Register scratch, |
| 2323 | Register scratch2, |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2324 | DwVfpRegister double_scratch, |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 2325 | Label *not_int32) { |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 2326 | if (CpuFeatures::IsSupported(VFP3)) { |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 2327 | CpuFeatures::Scope scope(VFP3); |
| 2328 | sub(scratch, source, Operand(kHeapObjectTag)); |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2329 | vldr(double_scratch, scratch, HeapNumber::kValueOffset); |
| 2330 | vcvt_s32_f64(double_scratch.low(), double_scratch); |
| 2331 | vmov(dest, double_scratch.low()); |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 2332 | // Signed vcvt instruction will saturate to the minimum (0x80000000) or |
| 2333 | // maximun (0x7fffffff) signed 32bits integer when the double is out of |
| 2334 | // range. When substracting one, the minimum signed integer becomes the |
| 2335 | // maximun signed integer. |
| 2336 | sub(scratch, dest, Operand(1)); |
| 2337 | cmp(scratch, Operand(LONG_MAX - 1)); |
| 2338 | // If equal then dest was LONG_MAX, if greater dest was LONG_MIN. |
| 2339 | b(ge, not_int32); |
| 2340 | } else { |
| 2341 | // This code is faster for doubles that are in the ranges -0x7fffffff to |
| 2342 | // -0x40000000 or 0x40000000 to 0x7fffffff. This corresponds almost to |
| 2343 | // the range of signed int32 values that are not Smis. Jumps to the label |
| 2344 | // 'not_int32' if the double isn't in the range -0x80000000.0 to |
| 2345 | // 0x80000000.0 (excluding the endpoints). |
| 2346 | Label right_exponent, done; |
| 2347 | // Get exponent word. |
| 2348 | ldr(scratch, FieldMemOperand(source, HeapNumber::kExponentOffset)); |
| 2349 | // Get exponent alone in scratch2. |
| 2350 | Ubfx(scratch2, |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 2351 | scratch, |
| 2352 | HeapNumber::kExponentShift, |
| 2353 | HeapNumber::kExponentBits); |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 2354 | // Load dest with zero. We use this either for the final shift or |
| 2355 | // for the answer. |
| 2356 | mov(dest, Operand(0, RelocInfo::NONE)); |
| 2357 | // Check whether the exponent matches a 32 bit signed int that is not a Smi. |
| 2358 | // A non-Smi integer is 1.xxx * 2^30 so the exponent is 30 (biased). This is |
| 2359 | // the exponent that we are fastest at and also the highest exponent we can |
| 2360 | // handle here. |
| 2361 | const uint32_t non_smi_exponent = HeapNumber::kExponentBias + 30; |
| 2362 | // The non_smi_exponent, 0x41d, is too big for ARM's immediate field so we |
| 2363 | // split it up to avoid a constant pool entry. You can't do that in general |
| 2364 | // for cmp because of the overflow flag, but we know the exponent is in the |
| 2365 | // range 0-2047 so there is no overflow. |
| 2366 | int fudge_factor = 0x400; |
| 2367 | sub(scratch2, scratch2, Operand(fudge_factor)); |
| 2368 | cmp(scratch2, Operand(non_smi_exponent - fudge_factor)); |
| 2369 | // If we have a match of the int32-but-not-Smi exponent then skip some |
| 2370 | // logic. |
| 2371 | b(eq, &right_exponent); |
| 2372 | // If the exponent is higher than that then go to slow case. This catches |
| 2373 | // numbers that don't fit in a signed int32, infinities and NaNs. |
| 2374 | b(gt, not_int32); |
| 2375 | |
| 2376 | // We know the exponent is smaller than 30 (biased). If it is less than |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 2377 | // 0 (biased) then the number is smaller in magnitude than 1.0 * 2^0, i.e. |
Iain Merrick | 9ac36c9 | 2010-09-13 15:29:50 +0100 | [diff] [blame] | 2378 | // it rounds to zero. |
| 2379 | const uint32_t zero_exponent = HeapNumber::kExponentBias + 0; |
| 2380 | sub(scratch2, scratch2, Operand(zero_exponent - fudge_factor), SetCC); |
| 2381 | // Dest already has a Smi zero. |
| 2382 | b(lt, &done); |
| 2383 | |
| 2384 | // We have an exponent between 0 and 30 in scratch2. Subtract from 30 to |
| 2385 | // get how much to shift down. |
| 2386 | rsb(dest, scratch2, Operand(30)); |
| 2387 | |
| 2388 | bind(&right_exponent); |
| 2389 | // Get the top bits of the mantissa. |
| 2390 | and_(scratch2, scratch, Operand(HeapNumber::kMantissaMask)); |
| 2391 | // Put back the implicit 1. |
| 2392 | orr(scratch2, scratch2, Operand(1 << HeapNumber::kExponentShift)); |
| 2393 | // Shift up the mantissa bits to take up the space the exponent used to |
| 2394 | // take. We just orred in the implicit bit so that took care of one and |
| 2395 | // we want to leave the sign bit 0 so we subtract 2 bits from the shift |
| 2396 | // distance. |
| 2397 | const int shift_distance = HeapNumber::kNonMantissaBitsInTopWord - 2; |
| 2398 | mov(scratch2, Operand(scratch2, LSL, shift_distance)); |
| 2399 | // Put sign in zero flag. |
| 2400 | tst(scratch, Operand(HeapNumber::kSignMask)); |
| 2401 | // Get the second half of the double. For some exponents we don't |
| 2402 | // actually need this because the bits get shifted out again, but |
| 2403 | // it's probably slower to test than just to do it. |
| 2404 | ldr(scratch, FieldMemOperand(source, HeapNumber::kMantissaOffset)); |
| 2405 | // Shift down 22 bits to get the last 10 bits. |
| 2406 | orr(scratch, scratch2, Operand(scratch, LSR, 32 - shift_distance)); |
| 2407 | // Move down according to the exponent. |
| 2408 | mov(dest, Operand(scratch, LSR, dest)); |
| 2409 | // Fix sign if sign bit was set. |
| 2410 | rsb(dest, dest, Operand(0, RelocInfo::NONE), LeaveCC, ne); |
| 2411 | bind(&done); |
| 2412 | } |
| 2413 | } |
| 2414 | |
| 2415 | |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 2416 | void MacroAssembler::EmitVFPTruncate(VFPRoundingMode rounding_mode, |
| 2417 | SwVfpRegister result, |
| 2418 | DwVfpRegister double_input, |
| 2419 | Register scratch1, |
| 2420 | Register scratch2, |
| 2421 | CheckForInexactConversion check_inexact) { |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 2422 | ASSERT(CpuFeatures::IsSupported(VFP3)); |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 2423 | CpuFeatures::Scope scope(VFP3); |
| 2424 | Register prev_fpscr = scratch1; |
| 2425 | Register scratch = scratch2; |
| 2426 | |
| 2427 | int32_t check_inexact_conversion = |
| 2428 | (check_inexact == kCheckForInexactConversion) ? kVFPInexactExceptionBit : 0; |
| 2429 | |
| 2430 | // Set custom FPCSR: |
| 2431 | // - Set rounding mode. |
| 2432 | // - Clear vfp cumulative exception flags. |
| 2433 | // - Make sure Flush-to-zero mode control bit is unset. |
| 2434 | vmrs(prev_fpscr); |
| 2435 | bic(scratch, |
| 2436 | prev_fpscr, |
| 2437 | Operand(kVFPExceptionMask | |
| 2438 | check_inexact_conversion | |
| 2439 | kVFPRoundingModeMask | |
| 2440 | kVFPFlushToZeroMask)); |
| 2441 | // 'Round To Nearest' is encoded by 0b00 so no bits need to be set. |
| 2442 | if (rounding_mode != kRoundToNearest) { |
| 2443 | orr(scratch, scratch, Operand(rounding_mode)); |
| 2444 | } |
| 2445 | vmsr(scratch); |
| 2446 | |
| 2447 | // Convert the argument to an integer. |
| 2448 | vcvt_s32_f64(result, |
| 2449 | double_input, |
| 2450 | (rounding_mode == kRoundToZero) ? kDefaultRoundToZero |
| 2451 | : kFPSCRRounding); |
| 2452 | |
| 2453 | // Retrieve FPSCR. |
| 2454 | vmrs(scratch); |
| 2455 | // Restore FPSCR. |
| 2456 | vmsr(prev_fpscr); |
| 2457 | // Check for vfp exceptions. |
| 2458 | tst(scratch, Operand(kVFPExceptionMask | check_inexact_conversion)); |
| 2459 | } |
| 2460 | |
| 2461 | |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 2462 | void MacroAssembler::EmitOutOfInt32RangeTruncate(Register result, |
| 2463 | Register input_high, |
| 2464 | Register input_low, |
| 2465 | Register scratch) { |
| 2466 | Label done, normal_exponent, restore_sign; |
| 2467 | |
| 2468 | // Extract the biased exponent in result. |
| 2469 | Ubfx(result, |
| 2470 | input_high, |
| 2471 | HeapNumber::kExponentShift, |
| 2472 | HeapNumber::kExponentBits); |
| 2473 | |
| 2474 | // Check for Infinity and NaNs, which should return 0. |
| 2475 | cmp(result, Operand(HeapNumber::kExponentMask)); |
| 2476 | mov(result, Operand(0), LeaveCC, eq); |
| 2477 | b(eq, &done); |
| 2478 | |
| 2479 | // Express exponent as delta to (number of mantissa bits + 31). |
| 2480 | sub(result, |
| 2481 | result, |
| 2482 | Operand(HeapNumber::kExponentBias + HeapNumber::kMantissaBits + 31), |
| 2483 | SetCC); |
| 2484 | |
| 2485 | // If the delta is strictly positive, all bits would be shifted away, |
| 2486 | // which means that we can return 0. |
| 2487 | b(le, &normal_exponent); |
| 2488 | mov(result, Operand(0)); |
| 2489 | b(&done); |
| 2490 | |
| 2491 | bind(&normal_exponent); |
| 2492 | const int kShiftBase = HeapNumber::kNonMantissaBitsInTopWord - 1; |
| 2493 | // Calculate shift. |
| 2494 | add(scratch, result, Operand(kShiftBase + HeapNumber::kMantissaBits), SetCC); |
| 2495 | |
| 2496 | // Save the sign. |
| 2497 | Register sign = result; |
| 2498 | result = no_reg; |
| 2499 | and_(sign, input_high, Operand(HeapNumber::kSignMask)); |
| 2500 | |
| 2501 | // Set the implicit 1 before the mantissa part in input_high. |
| 2502 | orr(input_high, |
| 2503 | input_high, |
| 2504 | Operand(1 << HeapNumber::kMantissaBitsInTopWord)); |
| 2505 | // Shift the mantissa bits to the correct position. |
| 2506 | // We don't need to clear non-mantissa bits as they will be shifted away. |
| 2507 | // If they weren't, it would mean that the answer is in the 32bit range. |
| 2508 | mov(input_high, Operand(input_high, LSL, scratch)); |
| 2509 | |
| 2510 | // Replace the shifted bits with bits from the lower mantissa word. |
| 2511 | Label pos_shift, shift_done; |
| 2512 | rsb(scratch, scratch, Operand(32), SetCC); |
| 2513 | b(&pos_shift, ge); |
| 2514 | |
| 2515 | // Negate scratch. |
| 2516 | rsb(scratch, scratch, Operand(0)); |
| 2517 | mov(input_low, Operand(input_low, LSL, scratch)); |
| 2518 | b(&shift_done); |
| 2519 | |
| 2520 | bind(&pos_shift); |
| 2521 | mov(input_low, Operand(input_low, LSR, scratch)); |
| 2522 | |
| 2523 | bind(&shift_done); |
| 2524 | orr(input_high, input_high, Operand(input_low)); |
| 2525 | // Restore sign if necessary. |
| 2526 | cmp(sign, Operand(0)); |
| 2527 | result = sign; |
| 2528 | sign = no_reg; |
| 2529 | rsb(result, input_high, Operand(0), LeaveCC, ne); |
| 2530 | mov(result, input_high, LeaveCC, eq); |
| 2531 | bind(&done); |
| 2532 | } |
| 2533 | |
| 2534 | |
| 2535 | void MacroAssembler::EmitECMATruncate(Register result, |
| 2536 | DwVfpRegister double_input, |
| 2537 | SwVfpRegister single_scratch, |
| 2538 | Register scratch, |
| 2539 | Register input_high, |
| 2540 | Register input_low) { |
| 2541 | CpuFeatures::Scope scope(VFP3); |
| 2542 | ASSERT(!input_high.is(result)); |
| 2543 | ASSERT(!input_low.is(result)); |
| 2544 | ASSERT(!input_low.is(input_high)); |
| 2545 | ASSERT(!scratch.is(result) && |
| 2546 | !scratch.is(input_high) && |
| 2547 | !scratch.is(input_low)); |
| 2548 | ASSERT(!single_scratch.is(double_input.low()) && |
| 2549 | !single_scratch.is(double_input.high())); |
| 2550 | |
| 2551 | Label done; |
| 2552 | |
| 2553 | // Clear cumulative exception flags. |
| 2554 | ClearFPSCRBits(kVFPExceptionMask, scratch); |
| 2555 | // Try a conversion to a signed integer. |
| 2556 | vcvt_s32_f64(single_scratch, double_input); |
| 2557 | vmov(result, single_scratch); |
| 2558 | // Retrieve he FPSCR. |
| 2559 | vmrs(scratch); |
| 2560 | // Check for overflow and NaNs. |
| 2561 | tst(scratch, Operand(kVFPOverflowExceptionBit | |
| 2562 | kVFPUnderflowExceptionBit | |
| 2563 | kVFPInvalidOpExceptionBit)); |
| 2564 | // If we had no exceptions we are done. |
| 2565 | b(eq, &done); |
| 2566 | |
| 2567 | // Load the double value and perform a manual truncation. |
| 2568 | vmov(input_low, input_high, double_input); |
| 2569 | EmitOutOfInt32RangeTruncate(result, |
| 2570 | input_high, |
| 2571 | input_low, |
| 2572 | scratch); |
| 2573 | bind(&done); |
| 2574 | } |
| 2575 | |
| 2576 | |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 2577 | void MacroAssembler::GetLeastBitsFromSmi(Register dst, |
| 2578 | Register src, |
| 2579 | int num_least_bits) { |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 2580 | if (CpuFeatures::IsSupported(ARMv7)) { |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 2581 | ubfx(dst, src, kSmiTagSize, num_least_bits); |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 2582 | } else { |
| 2583 | mov(dst, Operand(src, ASR, kSmiTagSize)); |
| 2584 | and_(dst, dst, Operand((1 << num_least_bits) - 1)); |
| 2585 | } |
| 2586 | } |
| 2587 | |
| 2588 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2589 | void MacroAssembler::GetLeastBitsFromInt32(Register dst, |
| 2590 | Register src, |
| 2591 | int num_least_bits) { |
| 2592 | and_(dst, src, Operand((1 << num_least_bits) - 1)); |
| 2593 | } |
| 2594 | |
| 2595 | |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 2596 | void MacroAssembler::CallRuntime(const Runtime::Function* f, |
| 2597 | int num_arguments) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2598 | // All parameters are on the stack. r0 has the return value after call. |
| 2599 | |
| 2600 | // If the expected number of arguments of the runtime function is |
| 2601 | // constant, we check that the actual number of arguments match the |
| 2602 | // expectation. |
| 2603 | if (f->nargs >= 0 && f->nargs != num_arguments) { |
| 2604 | IllegalOperation(num_arguments); |
| 2605 | return; |
| 2606 | } |
| 2607 | |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 2608 | // TODO(1236192): Most runtime routines don't need the number of |
| 2609 | // arguments passed in because it is constant. At some point we |
| 2610 | // should remove this need and make the runtime routine entry code |
| 2611 | // smarter. |
| 2612 | mov(r0, Operand(num_arguments)); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 2613 | mov(r1, Operand(ExternalReference(f, isolate()))); |
Leon Clarke | 4515c47 | 2010-02-03 11:58:03 +0000 | [diff] [blame] | 2614 | CEntryStub stub(1); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2615 | CallStub(&stub); |
| 2616 | } |
| 2617 | |
| 2618 | |
| 2619 | void MacroAssembler::CallRuntime(Runtime::FunctionId fid, int num_arguments) { |
| 2620 | CallRuntime(Runtime::FunctionForId(fid), num_arguments); |
| 2621 | } |
| 2622 | |
| 2623 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 2624 | void MacroAssembler::CallRuntimeSaveDoubles(Runtime::FunctionId id) { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 2625 | const Runtime::Function* function = Runtime::FunctionForId(id); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 2626 | mov(r0, Operand(function->nargs)); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 2627 | mov(r1, Operand(ExternalReference(function, isolate()))); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 2628 | CEntryStub stub(1, kSaveFPRegs); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 2629 | CallStub(&stub); |
| 2630 | } |
| 2631 | |
| 2632 | |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 2633 | void MacroAssembler::CallExternalReference(const ExternalReference& ext, |
| 2634 | int num_arguments) { |
| 2635 | mov(r0, Operand(num_arguments)); |
| 2636 | mov(r1, Operand(ext)); |
| 2637 | |
| 2638 | CEntryStub stub(1); |
| 2639 | CallStub(&stub); |
| 2640 | } |
| 2641 | |
| 2642 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 2643 | void MacroAssembler::TailCallExternalReference(const ExternalReference& ext, |
| 2644 | int num_arguments, |
| 2645 | int result_size) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2646 | // TODO(1236192): Most runtime routines don't need the number of |
| 2647 | // arguments passed in because it is constant. At some point we |
| 2648 | // should remove this need and make the runtime routine entry code |
| 2649 | // smarter. |
| 2650 | mov(r0, Operand(num_arguments)); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 2651 | JumpToExternalReference(ext); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2652 | } |
| 2653 | |
| 2654 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 2655 | void MacroAssembler::TailCallRuntime(Runtime::FunctionId fid, |
| 2656 | int num_arguments, |
| 2657 | int result_size) { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 2658 | TailCallExternalReference(ExternalReference(fid, isolate()), |
| 2659 | num_arguments, |
| 2660 | result_size); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 2661 | } |
| 2662 | |
| 2663 | |
| 2664 | void MacroAssembler::JumpToExternalReference(const ExternalReference& builtin) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2665 | #if defined(__thumb__) |
| 2666 | // Thumb mode builtin. |
| 2667 | ASSERT((reinterpret_cast<intptr_t>(builtin.address()) & 1) == 1); |
| 2668 | #endif |
| 2669 | mov(r1, Operand(builtin)); |
| 2670 | CEntryStub stub(1); |
| 2671 | Jump(stub.GetCode(), RelocInfo::CODE_TARGET); |
| 2672 | } |
| 2673 | |
| 2674 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2675 | void MacroAssembler::InvokeBuiltin(Builtins::JavaScript id, |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 2676 | InvokeFlag flag, |
| 2677 | const CallWrapper& call_wrapper) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 2678 | // You can't call a builtin without a valid frame. |
| 2679 | ASSERT(flag == JUMP_FUNCTION || has_frame()); |
| 2680 | |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 2681 | GetBuiltinEntry(r2, id); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 2682 | if (flag == CALL_FUNCTION) { |
| 2683 | call_wrapper.BeforeCall(CallSize(r2)); |
| 2684 | SetCallKind(r5, CALL_AS_METHOD); |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 2685 | Call(r2); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 2686 | call_wrapper.AfterCall(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2687 | } else { |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 2688 | ASSERT(flag == JUMP_FUNCTION); |
| 2689 | SetCallKind(r5, CALL_AS_METHOD); |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 2690 | Jump(r2); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2691 | } |
| 2692 | } |
| 2693 | |
| 2694 | |
Steve Block | 791712a | 2010-08-27 10:21:07 +0100 | [diff] [blame] | 2695 | void MacroAssembler::GetBuiltinFunction(Register target, |
| 2696 | Builtins::JavaScript id) { |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 2697 | // Load the builtins object into target register. |
| 2698 | ldr(target, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX))); |
| 2699 | ldr(target, FieldMemOperand(target, GlobalObject::kBuiltinsOffset)); |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 2700 | // Load the JavaScript builtin function from the builtins object. |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 2701 | ldr(target, FieldMemOperand(target, |
Steve Block | 791712a | 2010-08-27 10:21:07 +0100 | [diff] [blame] | 2702 | JSBuiltinsObject::OffsetOfFunctionWithId(id))); |
| 2703 | } |
| 2704 | |
| 2705 | |
| 2706 | void MacroAssembler::GetBuiltinEntry(Register target, Builtins::JavaScript id) { |
| 2707 | ASSERT(!target.is(r1)); |
| 2708 | GetBuiltinFunction(r1, id); |
| 2709 | // Load the code entry point from the builtins object. |
| 2710 | ldr(target, FieldMemOperand(r1, JSFunction::kCodeEntryOffset)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2711 | } |
| 2712 | |
| 2713 | |
| 2714 | void MacroAssembler::SetCounter(StatsCounter* counter, int value, |
| 2715 | Register scratch1, Register scratch2) { |
| 2716 | if (FLAG_native_code_counters && counter->Enabled()) { |
| 2717 | mov(scratch1, Operand(value)); |
| 2718 | mov(scratch2, Operand(ExternalReference(counter))); |
| 2719 | str(scratch1, MemOperand(scratch2)); |
| 2720 | } |
| 2721 | } |
| 2722 | |
| 2723 | |
| 2724 | void MacroAssembler::IncrementCounter(StatsCounter* counter, int value, |
| 2725 | Register scratch1, Register scratch2) { |
| 2726 | ASSERT(value > 0); |
| 2727 | if (FLAG_native_code_counters && counter->Enabled()) { |
| 2728 | mov(scratch2, Operand(ExternalReference(counter))); |
| 2729 | ldr(scratch1, MemOperand(scratch2)); |
| 2730 | add(scratch1, scratch1, Operand(value)); |
| 2731 | str(scratch1, MemOperand(scratch2)); |
| 2732 | } |
| 2733 | } |
| 2734 | |
| 2735 | |
| 2736 | void MacroAssembler::DecrementCounter(StatsCounter* counter, int value, |
| 2737 | Register scratch1, Register scratch2) { |
| 2738 | ASSERT(value > 0); |
| 2739 | if (FLAG_native_code_counters && counter->Enabled()) { |
| 2740 | mov(scratch2, Operand(ExternalReference(counter))); |
| 2741 | ldr(scratch1, MemOperand(scratch2)); |
| 2742 | sub(scratch1, scratch1, Operand(value)); |
| 2743 | str(scratch1, MemOperand(scratch2)); |
| 2744 | } |
| 2745 | } |
| 2746 | |
| 2747 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2748 | void MacroAssembler::Assert(Condition cond, const char* msg) { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 2749 | if (emit_debug_code()) |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2750 | Check(cond, msg); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2751 | } |
| 2752 | |
| 2753 | |
Kristian Monsen | 9dcf7e2 | 2010-06-28 14:14:28 +0100 | [diff] [blame] | 2754 | void MacroAssembler::AssertRegisterIsRoot(Register reg, |
| 2755 | Heap::RootListIndex index) { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 2756 | if (emit_debug_code()) { |
Kristian Monsen | 9dcf7e2 | 2010-06-28 14:14:28 +0100 | [diff] [blame] | 2757 | LoadRoot(ip, index); |
| 2758 | cmp(reg, ip); |
| 2759 | Check(eq, "Register did not match expected root"); |
| 2760 | } |
| 2761 | } |
| 2762 | |
| 2763 | |
Iain Merrick | 7568138 | 2010-08-19 15:07:18 +0100 | [diff] [blame] | 2764 | void MacroAssembler::AssertFastElements(Register elements) { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 2765 | if (emit_debug_code()) { |
Iain Merrick | 7568138 | 2010-08-19 15:07:18 +0100 | [diff] [blame] | 2766 | ASSERT(!elements.is(ip)); |
| 2767 | Label ok; |
| 2768 | push(elements); |
| 2769 | ldr(elements, FieldMemOperand(elements, HeapObject::kMapOffset)); |
| 2770 | LoadRoot(ip, Heap::kFixedArrayMapRootIndex); |
| 2771 | cmp(elements, ip); |
| 2772 | b(eq, &ok); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 2773 | LoadRoot(ip, Heap::kFixedDoubleArrayMapRootIndex); |
| 2774 | cmp(elements, ip); |
| 2775 | b(eq, &ok); |
Iain Merrick | 7568138 | 2010-08-19 15:07:18 +0100 | [diff] [blame] | 2776 | LoadRoot(ip, Heap::kFixedCOWArrayMapRootIndex); |
| 2777 | cmp(elements, ip); |
| 2778 | b(eq, &ok); |
| 2779 | Abort("JSObject with fast elements map has slow elements"); |
| 2780 | bind(&ok); |
| 2781 | pop(elements); |
| 2782 | } |
| 2783 | } |
| 2784 | |
| 2785 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2786 | void MacroAssembler::Check(Condition cond, const char* msg) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2787 | Label L; |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2788 | b(cond, &L); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2789 | Abort(msg); |
| 2790 | // will not return here |
| 2791 | bind(&L); |
| 2792 | } |
| 2793 | |
| 2794 | |
| 2795 | void MacroAssembler::Abort(const char* msg) { |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 2796 | Label abort_start; |
| 2797 | bind(&abort_start); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2798 | // We want to pass the msg string like a smi to avoid GC |
| 2799 | // problems, however msg is not guaranteed to be aligned |
| 2800 | // properly. Instead, we pass an aligned pointer that is |
| 2801 | // a proper v8 smi, but also pass the alignment difference |
| 2802 | // from the real pointer as a smi. |
| 2803 | intptr_t p1 = reinterpret_cast<intptr_t>(msg); |
| 2804 | intptr_t p0 = (p1 & ~kSmiTagMask) + kSmiTag; |
| 2805 | ASSERT(reinterpret_cast<Object*>(p0)->IsSmi()); |
| 2806 | #ifdef DEBUG |
| 2807 | if (msg != NULL) { |
| 2808 | RecordComment("Abort message: "); |
| 2809 | RecordComment(msg); |
| 2810 | } |
| 2811 | #endif |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 2812 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2813 | mov(r0, Operand(p0)); |
| 2814 | push(r0); |
| 2815 | mov(r0, Operand(Smi::FromInt(p1 - p0))); |
| 2816 | push(r0); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 2817 | // Disable stub call restrictions to always allow calls to abort. |
| 2818 | if (!has_frame_) { |
| 2819 | // We don't actually want to generate a pile of code for this, so just |
| 2820 | // claim there is a stack frame, without generating one. |
| 2821 | FrameScope scope(this, StackFrame::NONE); |
| 2822 | CallRuntime(Runtime::kAbort, 2); |
| 2823 | } else { |
| 2824 | CallRuntime(Runtime::kAbort, 2); |
| 2825 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2826 | // will not return here |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 2827 | if (is_const_pool_blocked()) { |
| 2828 | // If the calling code cares about the exact number of |
| 2829 | // instructions generated, we insert padding here to keep the size |
| 2830 | // of the Abort macro constant. |
| 2831 | static const int kExpectedAbortInstructions = 10; |
| 2832 | int abort_instructions = InstructionsGeneratedSince(&abort_start); |
| 2833 | ASSERT(abort_instructions <= kExpectedAbortInstructions); |
| 2834 | while (abort_instructions++ < kExpectedAbortInstructions) { |
| 2835 | nop(); |
| 2836 | } |
| 2837 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 2838 | } |
| 2839 | |
| 2840 | |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 2841 | void MacroAssembler::LoadContext(Register dst, int context_chain_length) { |
| 2842 | if (context_chain_length > 0) { |
| 2843 | // Move up the chain of contexts to the context containing the slot. |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 2844 | ldr(dst, MemOperand(cp, Context::SlotOffset(Context::PREVIOUS_INDEX))); |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 2845 | for (int i = 1; i < context_chain_length; i++) { |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 2846 | ldr(dst, MemOperand(dst, Context::SlotOffset(Context::PREVIOUS_INDEX))); |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 2847 | } |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 2848 | } else { |
| 2849 | // Slot is in the current function context. Move it into the |
| 2850 | // destination register in case we store into it (the write barrier |
| 2851 | // cannot be allowed to destroy the context in esi). |
| 2852 | mov(dst, cp); |
| 2853 | } |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 2854 | } |
| 2855 | |
| 2856 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 2857 | void MacroAssembler::LoadTransitionedArrayMapConditional( |
| 2858 | ElementsKind expected_kind, |
| 2859 | ElementsKind transitioned_kind, |
| 2860 | Register map_in_out, |
| 2861 | Register scratch, |
| 2862 | Label* no_map_match) { |
| 2863 | // Load the global or builtins object from the current context. |
| 2864 | ldr(scratch, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX))); |
| 2865 | ldr(scratch, FieldMemOperand(scratch, GlobalObject::kGlobalContextOffset)); |
| 2866 | |
| 2867 | // Check that the function's map is the same as the expected cached map. |
| 2868 | int expected_index = |
| 2869 | Context::GetContextMapIndexFromElementsKind(expected_kind); |
| 2870 | ldr(ip, MemOperand(scratch, Context::SlotOffset(expected_index))); |
| 2871 | cmp(map_in_out, ip); |
| 2872 | b(ne, no_map_match); |
| 2873 | |
| 2874 | // Use the transitioned cached map. |
| 2875 | int trans_index = |
| 2876 | Context::GetContextMapIndexFromElementsKind(transitioned_kind); |
| 2877 | ldr(map_in_out, MemOperand(scratch, Context::SlotOffset(trans_index))); |
| 2878 | } |
| 2879 | |
| 2880 | |
| 2881 | void MacroAssembler::LoadInitialArrayMap( |
| 2882 | Register function_in, Register scratch, Register map_out) { |
| 2883 | ASSERT(!function_in.is(map_out)); |
| 2884 | Label done; |
| 2885 | ldr(map_out, FieldMemOperand(function_in, |
| 2886 | JSFunction::kPrototypeOrInitialMapOffset)); |
| 2887 | if (!FLAG_smi_only_arrays) { |
| 2888 | LoadTransitionedArrayMapConditional(FAST_SMI_ONLY_ELEMENTS, |
| 2889 | FAST_ELEMENTS, |
| 2890 | map_out, |
| 2891 | scratch, |
| 2892 | &done); |
| 2893 | } |
| 2894 | bind(&done); |
| 2895 | } |
| 2896 | |
| 2897 | |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 2898 | void MacroAssembler::LoadGlobalFunction(int index, Register function) { |
| 2899 | // Load the global or builtins object from the current context. |
| 2900 | ldr(function, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX))); |
| 2901 | // Load the global context from the global or builtins object. |
| 2902 | ldr(function, FieldMemOperand(function, |
| 2903 | GlobalObject::kGlobalContextOffset)); |
| 2904 | // Load the function from the global context. |
| 2905 | ldr(function, MemOperand(function, Context::SlotOffset(index))); |
| 2906 | } |
| 2907 | |
| 2908 | |
| 2909 | void MacroAssembler::LoadGlobalFunctionInitialMap(Register function, |
| 2910 | Register map, |
| 2911 | Register scratch) { |
| 2912 | // Load the initial map. The global functions all have initial maps. |
| 2913 | ldr(map, FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset)); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 2914 | if (emit_debug_code()) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 2915 | Label ok, fail; |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 2916 | CheckMap(map, scratch, Heap::kMetaMapRootIndex, &fail, DO_SMI_CHECK); |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 2917 | b(&ok); |
| 2918 | bind(&fail); |
| 2919 | Abort("Global functions must have initial map"); |
| 2920 | bind(&ok); |
| 2921 | } |
| 2922 | } |
| 2923 | |
| 2924 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2925 | void MacroAssembler::JumpIfNotPowerOfTwoOrZero( |
| 2926 | Register reg, |
| 2927 | Register scratch, |
| 2928 | Label* not_power_of_two_or_zero) { |
| 2929 | sub(scratch, reg, Operand(1), SetCC); |
| 2930 | b(mi, not_power_of_two_or_zero); |
| 2931 | tst(scratch, reg); |
| 2932 | b(ne, not_power_of_two_or_zero); |
| 2933 | } |
| 2934 | |
| 2935 | |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 2936 | void MacroAssembler::JumpIfNotPowerOfTwoOrZeroAndNeg( |
| 2937 | Register reg, |
| 2938 | Register scratch, |
| 2939 | Label* zero_and_neg, |
| 2940 | Label* not_power_of_two) { |
| 2941 | sub(scratch, reg, Operand(1), SetCC); |
| 2942 | b(mi, zero_and_neg); |
| 2943 | tst(scratch, reg); |
| 2944 | b(ne, not_power_of_two); |
| 2945 | } |
| 2946 | |
| 2947 | |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 2948 | void MacroAssembler::JumpIfNotBothSmi(Register reg1, |
| 2949 | Register reg2, |
| 2950 | Label* on_not_both_smi) { |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2951 | STATIC_ASSERT(kSmiTag == 0); |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 2952 | tst(reg1, Operand(kSmiTagMask)); |
| 2953 | tst(reg2, Operand(kSmiTagMask), eq); |
| 2954 | b(ne, on_not_both_smi); |
| 2955 | } |
| 2956 | |
| 2957 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 2958 | void MacroAssembler::UntagAndJumpIfSmi( |
| 2959 | Register dst, Register src, Label* smi_case) { |
| 2960 | STATIC_ASSERT(kSmiTag == 0); |
| 2961 | mov(dst, Operand(src, ASR, kSmiTagSize), SetCC); |
| 2962 | b(cc, smi_case); // Shifter carry is not set for a smi. |
| 2963 | } |
| 2964 | |
| 2965 | |
| 2966 | void MacroAssembler::UntagAndJumpIfNotSmi( |
| 2967 | Register dst, Register src, Label* non_smi_case) { |
| 2968 | STATIC_ASSERT(kSmiTag == 0); |
| 2969 | mov(dst, Operand(src, ASR, kSmiTagSize), SetCC); |
| 2970 | b(cs, non_smi_case); // Shifter carry is set for a non-smi. |
| 2971 | } |
| 2972 | |
| 2973 | |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 2974 | void MacroAssembler::JumpIfEitherSmi(Register reg1, |
| 2975 | Register reg2, |
| 2976 | Label* on_either_smi) { |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2977 | STATIC_ASSERT(kSmiTag == 0); |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 2978 | tst(reg1, Operand(kSmiTagMask)); |
| 2979 | tst(reg2, Operand(kSmiTagMask), ne); |
| 2980 | b(eq, on_either_smi); |
| 2981 | } |
| 2982 | |
| 2983 | |
Iain Merrick | 7568138 | 2010-08-19 15:07:18 +0100 | [diff] [blame] | 2984 | void MacroAssembler::AbortIfSmi(Register object) { |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2985 | STATIC_ASSERT(kSmiTag == 0); |
Iain Merrick | 7568138 | 2010-08-19 15:07:18 +0100 | [diff] [blame] | 2986 | tst(object, Operand(kSmiTagMask)); |
| 2987 | Assert(ne, "Operand is a smi"); |
| 2988 | } |
| 2989 | |
| 2990 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 2991 | void MacroAssembler::AbortIfNotSmi(Register object) { |
| 2992 | STATIC_ASSERT(kSmiTag == 0); |
| 2993 | tst(object, Operand(kSmiTagMask)); |
| 2994 | Assert(eq, "Operand is not smi"); |
| 2995 | } |
| 2996 | |
| 2997 | |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 2998 | void MacroAssembler::AbortIfNotString(Register object) { |
| 2999 | STATIC_ASSERT(kSmiTag == 0); |
| 3000 | tst(object, Operand(kSmiTagMask)); |
| 3001 | Assert(ne, "Operand is not a string"); |
| 3002 | push(object); |
| 3003 | ldr(object, FieldMemOperand(object, HeapObject::kMapOffset)); |
| 3004 | CompareInstanceType(object, object, FIRST_NONSTRING_TYPE); |
| 3005 | pop(object); |
| 3006 | Assert(lo, "Operand is not a string"); |
| 3007 | } |
| 3008 | |
| 3009 | |
| 3010 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 3011 | void MacroAssembler::AbortIfNotRootValue(Register src, |
| 3012 | Heap::RootListIndex root_value_index, |
| 3013 | const char* message) { |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 3014 | CompareRoot(src, root_value_index); |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 3015 | Assert(eq, message); |
| 3016 | } |
| 3017 | |
| 3018 | |
| 3019 | void MacroAssembler::JumpIfNotHeapNumber(Register object, |
| 3020 | Register heap_number_map, |
| 3021 | Register scratch, |
| 3022 | Label* on_not_heap_number) { |
| 3023 | ldr(scratch, FieldMemOperand(object, HeapObject::kMapOffset)); |
| 3024 | AssertRegisterIsRoot(heap_number_map, Heap::kHeapNumberMapRootIndex); |
| 3025 | cmp(scratch, heap_number_map); |
| 3026 | b(ne, on_not_heap_number); |
| 3027 | } |
| 3028 | |
| 3029 | |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 3030 | void MacroAssembler::JumpIfNonSmisNotBothSequentialAsciiStrings( |
| 3031 | Register first, |
| 3032 | Register second, |
| 3033 | Register scratch1, |
| 3034 | Register scratch2, |
| 3035 | Label* failure) { |
| 3036 | // Test that both first and second are sequential ASCII strings. |
| 3037 | // Assume that they are non-smis. |
| 3038 | ldr(scratch1, FieldMemOperand(first, HeapObject::kMapOffset)); |
| 3039 | ldr(scratch2, FieldMemOperand(second, HeapObject::kMapOffset)); |
| 3040 | ldrb(scratch1, FieldMemOperand(scratch1, Map::kInstanceTypeOffset)); |
| 3041 | ldrb(scratch2, FieldMemOperand(scratch2, Map::kInstanceTypeOffset)); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3042 | |
| 3043 | JumpIfBothInstanceTypesAreNotSequentialAscii(scratch1, |
| 3044 | scratch2, |
| 3045 | scratch1, |
| 3046 | scratch2, |
| 3047 | failure); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 3048 | } |
| 3049 | |
| 3050 | void MacroAssembler::JumpIfNotBothSequentialAsciiStrings(Register first, |
| 3051 | Register second, |
| 3052 | Register scratch1, |
| 3053 | Register scratch2, |
| 3054 | Label* failure) { |
| 3055 | // Check that neither is a smi. |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 3056 | STATIC_ASSERT(kSmiTag == 0); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 3057 | and_(scratch1, first, Operand(second)); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 3058 | JumpIfSmi(scratch1, failure); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 3059 | JumpIfNonSmisNotBothSequentialAsciiStrings(first, |
| 3060 | second, |
| 3061 | scratch1, |
| 3062 | scratch2, |
| 3063 | failure); |
| 3064 | } |
| 3065 | |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 3066 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3067 | // Allocates a heap number or jumps to the need_gc label if the young space |
| 3068 | // is full and a scavenge is needed. |
| 3069 | void MacroAssembler::AllocateHeapNumber(Register result, |
| 3070 | Register scratch1, |
| 3071 | Register scratch2, |
Kristian Monsen | 9dcf7e2 | 2010-06-28 14:14:28 +0100 | [diff] [blame] | 3072 | Register heap_number_map, |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3073 | Label* gc_required) { |
| 3074 | // Allocate an object in the heap for the heap number and tag it as a heap |
| 3075 | // object. |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 3076 | AllocateInNewSpace(HeapNumber::kSize, |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3077 | result, |
| 3078 | scratch1, |
| 3079 | scratch2, |
| 3080 | gc_required, |
| 3081 | TAG_OBJECT); |
| 3082 | |
Kristian Monsen | 9dcf7e2 | 2010-06-28 14:14:28 +0100 | [diff] [blame] | 3083 | // Store heap number map in the allocated object. |
| 3084 | AssertRegisterIsRoot(heap_number_map, Heap::kHeapNumberMapRootIndex); |
| 3085 | str(heap_number_map, FieldMemOperand(result, HeapObject::kMapOffset)); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3086 | } |
| 3087 | |
| 3088 | |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 3089 | void MacroAssembler::AllocateHeapNumberWithValue(Register result, |
| 3090 | DwVfpRegister value, |
| 3091 | Register scratch1, |
| 3092 | Register scratch2, |
| 3093 | Register heap_number_map, |
| 3094 | Label* gc_required) { |
| 3095 | AllocateHeapNumber(result, scratch1, scratch2, heap_number_map, gc_required); |
| 3096 | sub(scratch1, result, Operand(kHeapObjectTag)); |
| 3097 | vstr(value, scratch1, HeapNumber::kValueOffset); |
| 3098 | } |
| 3099 | |
| 3100 | |
Ben Murdoch | bb769b2 | 2010-08-11 14:56:33 +0100 | [diff] [blame] | 3101 | // Copies a fixed number of fields of heap objects from src to dst. |
| 3102 | void MacroAssembler::CopyFields(Register dst, |
| 3103 | Register src, |
| 3104 | RegList temps, |
| 3105 | int field_count) { |
| 3106 | // At least one bit set in the first 15 registers. |
| 3107 | ASSERT((temps & ((1 << 15) - 1)) != 0); |
| 3108 | ASSERT((temps & dst.bit()) == 0); |
| 3109 | ASSERT((temps & src.bit()) == 0); |
| 3110 | // Primitive implementation using only one temporary register. |
| 3111 | |
| 3112 | Register tmp = no_reg; |
| 3113 | // Find a temp register in temps list. |
| 3114 | for (int i = 0; i < 15; i++) { |
| 3115 | if ((temps & (1 << i)) != 0) { |
| 3116 | tmp.set_code(i); |
| 3117 | break; |
| 3118 | } |
| 3119 | } |
| 3120 | ASSERT(!tmp.is(no_reg)); |
| 3121 | |
| 3122 | for (int i = 0; i < field_count; i++) { |
| 3123 | ldr(tmp, FieldMemOperand(src, i * kPointerSize)); |
| 3124 | str(tmp, FieldMemOperand(dst, i * kPointerSize)); |
| 3125 | } |
| 3126 | } |
| 3127 | |
| 3128 | |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 3129 | void MacroAssembler::CopyBytes(Register src, |
| 3130 | Register dst, |
| 3131 | Register length, |
| 3132 | Register scratch) { |
| 3133 | Label align_loop, align_loop_1, word_loop, byte_loop, byte_loop_1, done; |
| 3134 | |
| 3135 | // Align src before copying in word size chunks. |
| 3136 | bind(&align_loop); |
| 3137 | cmp(length, Operand(0)); |
| 3138 | b(eq, &done); |
| 3139 | bind(&align_loop_1); |
| 3140 | tst(src, Operand(kPointerSize - 1)); |
| 3141 | b(eq, &word_loop); |
| 3142 | ldrb(scratch, MemOperand(src, 1, PostIndex)); |
| 3143 | strb(scratch, MemOperand(dst, 1, PostIndex)); |
| 3144 | sub(length, length, Operand(1), SetCC); |
| 3145 | b(ne, &byte_loop_1); |
| 3146 | |
| 3147 | // Copy bytes in word size chunks. |
| 3148 | bind(&word_loop); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 3149 | if (emit_debug_code()) { |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 3150 | tst(src, Operand(kPointerSize - 1)); |
| 3151 | Assert(eq, "Expecting alignment for CopyBytes"); |
| 3152 | } |
| 3153 | cmp(length, Operand(kPointerSize)); |
| 3154 | b(lt, &byte_loop); |
| 3155 | ldr(scratch, MemOperand(src, kPointerSize, PostIndex)); |
| 3156 | #if CAN_USE_UNALIGNED_ACCESSES |
| 3157 | str(scratch, MemOperand(dst, kPointerSize, PostIndex)); |
| 3158 | #else |
| 3159 | strb(scratch, MemOperand(dst, 1, PostIndex)); |
| 3160 | mov(scratch, Operand(scratch, LSR, 8)); |
| 3161 | strb(scratch, MemOperand(dst, 1, PostIndex)); |
| 3162 | mov(scratch, Operand(scratch, LSR, 8)); |
| 3163 | strb(scratch, MemOperand(dst, 1, PostIndex)); |
| 3164 | mov(scratch, Operand(scratch, LSR, 8)); |
| 3165 | strb(scratch, MemOperand(dst, 1, PostIndex)); |
| 3166 | #endif |
| 3167 | sub(length, length, Operand(kPointerSize)); |
| 3168 | b(&word_loop); |
| 3169 | |
| 3170 | // Copy the last bytes if any left. |
| 3171 | bind(&byte_loop); |
| 3172 | cmp(length, Operand(0)); |
| 3173 | b(eq, &done); |
| 3174 | bind(&byte_loop_1); |
| 3175 | ldrb(scratch, MemOperand(src, 1, PostIndex)); |
| 3176 | strb(scratch, MemOperand(dst, 1, PostIndex)); |
| 3177 | sub(length, length, Operand(1), SetCC); |
| 3178 | b(ne, &byte_loop_1); |
| 3179 | bind(&done); |
| 3180 | } |
| 3181 | |
| 3182 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 3183 | void MacroAssembler::InitializeFieldsWithFiller(Register start_offset, |
| 3184 | Register end_offset, |
| 3185 | Register filler) { |
| 3186 | Label loop, entry; |
| 3187 | b(&entry); |
| 3188 | bind(&loop); |
| 3189 | str(filler, MemOperand(start_offset, kPointerSize, PostIndex)); |
| 3190 | bind(&entry); |
| 3191 | cmp(start_offset, end_offset); |
| 3192 | b(lt, &loop); |
| 3193 | } |
| 3194 | |
| 3195 | |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 3196 | void MacroAssembler::CountLeadingZeros(Register zeros, // Answer. |
| 3197 | Register source, // Input. |
| 3198 | Register scratch) { |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 3199 | ASSERT(!zeros.is(source) || !source.is(scratch)); |
Steve Block | 8defd9f | 2010-07-08 12:39:36 +0100 | [diff] [blame] | 3200 | ASSERT(!zeros.is(scratch)); |
| 3201 | ASSERT(!scratch.is(ip)); |
| 3202 | ASSERT(!source.is(ip)); |
| 3203 | ASSERT(!zeros.is(ip)); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3204 | #ifdef CAN_USE_ARMV5_INSTRUCTIONS |
| 3205 | clz(zeros, source); // This instruction is only supported after ARM5. |
| 3206 | #else |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 3207 | // Order of the next two lines is important: zeros register |
| 3208 | // can be the same as source register. |
Ben Murdoch | 85b7179 | 2012-04-11 18:30:58 +0100 | [diff] [blame] | 3209 | Move(scratch, source); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 3210 | mov(zeros, Operand(0, RelocInfo::NONE)); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3211 | // Top 16. |
| 3212 | tst(scratch, Operand(0xffff0000)); |
| 3213 | add(zeros, zeros, Operand(16), LeaveCC, eq); |
| 3214 | mov(scratch, Operand(scratch, LSL, 16), LeaveCC, eq); |
| 3215 | // Top 8. |
| 3216 | tst(scratch, Operand(0xff000000)); |
| 3217 | add(zeros, zeros, Operand(8), LeaveCC, eq); |
| 3218 | mov(scratch, Operand(scratch, LSL, 8), LeaveCC, eq); |
| 3219 | // Top 4. |
| 3220 | tst(scratch, Operand(0xf0000000)); |
| 3221 | add(zeros, zeros, Operand(4), LeaveCC, eq); |
| 3222 | mov(scratch, Operand(scratch, LSL, 4), LeaveCC, eq); |
| 3223 | // Top 2. |
| 3224 | tst(scratch, Operand(0xc0000000)); |
| 3225 | add(zeros, zeros, Operand(2), LeaveCC, eq); |
| 3226 | mov(scratch, Operand(scratch, LSL, 2), LeaveCC, eq); |
| 3227 | // Top bit. |
| 3228 | tst(scratch, Operand(0x80000000u)); |
| 3229 | add(zeros, zeros, Operand(1), LeaveCC, eq); |
| 3230 | #endif |
| 3231 | } |
| 3232 | |
| 3233 | |
| 3234 | void MacroAssembler::JumpIfBothInstanceTypesAreNotSequentialAscii( |
| 3235 | Register first, |
| 3236 | Register second, |
| 3237 | Register scratch1, |
| 3238 | Register scratch2, |
| 3239 | Label* failure) { |
| 3240 | int kFlatAsciiStringMask = |
| 3241 | kIsNotStringMask | kStringEncodingMask | kStringRepresentationMask; |
| 3242 | int kFlatAsciiStringTag = ASCII_STRING_TYPE; |
| 3243 | and_(scratch1, first, Operand(kFlatAsciiStringMask)); |
| 3244 | and_(scratch2, second, Operand(kFlatAsciiStringMask)); |
| 3245 | cmp(scratch1, Operand(kFlatAsciiStringTag)); |
| 3246 | // Ignore second test if first test failed. |
| 3247 | cmp(scratch2, Operand(kFlatAsciiStringTag), eq); |
| 3248 | b(ne, failure); |
| 3249 | } |
| 3250 | |
| 3251 | |
| 3252 | void MacroAssembler::JumpIfInstanceTypeIsNotSequentialAscii(Register type, |
| 3253 | Register scratch, |
| 3254 | Label* failure) { |
| 3255 | int kFlatAsciiStringMask = |
| 3256 | kIsNotStringMask | kStringEncodingMask | kStringRepresentationMask; |
| 3257 | int kFlatAsciiStringTag = ASCII_STRING_TYPE; |
| 3258 | and_(scratch, type, Operand(kFlatAsciiStringMask)); |
| 3259 | cmp(scratch, Operand(kFlatAsciiStringTag)); |
| 3260 | b(ne, failure); |
| 3261 | } |
| 3262 | |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 3263 | static const int kRegisterPassedArguments = 4; |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3264 | |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 3265 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 3266 | int MacroAssembler::CalculateStackPassedWords(int num_reg_arguments, |
| 3267 | int num_double_arguments) { |
| 3268 | int stack_passed_words = 0; |
| 3269 | if (use_eabi_hardfloat()) { |
| 3270 | // In the hard floating point calling convention, we can use |
| 3271 | // all double registers to pass doubles. |
| 3272 | if (num_double_arguments > DoubleRegister::kNumRegisters) { |
| 3273 | stack_passed_words += |
| 3274 | 2 * (num_double_arguments - DoubleRegister::kNumRegisters); |
| 3275 | } |
| 3276 | } else { |
| 3277 | // In the soft floating point calling convention, every double |
| 3278 | // argument is passed using two registers. |
| 3279 | num_reg_arguments += 2 * num_double_arguments; |
| 3280 | } |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3281 | // Up to four simple arguments are passed in registers r0..r3. |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 3282 | if (num_reg_arguments > kRegisterPassedArguments) { |
| 3283 | stack_passed_words += num_reg_arguments - kRegisterPassedArguments; |
| 3284 | } |
| 3285 | return stack_passed_words; |
| 3286 | } |
| 3287 | |
| 3288 | |
| 3289 | void MacroAssembler::PrepareCallCFunction(int num_reg_arguments, |
| 3290 | int num_double_arguments, |
| 3291 | Register scratch) { |
| 3292 | int frame_alignment = ActivationFrameAlignment(); |
| 3293 | int stack_passed_arguments = CalculateStackPassedWords( |
| 3294 | num_reg_arguments, num_double_arguments); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3295 | if (frame_alignment > kPointerSize) { |
| 3296 | // Make stack end at alignment and make room for num_arguments - 4 words |
| 3297 | // and the original value of sp. |
| 3298 | mov(scratch, sp); |
| 3299 | sub(sp, sp, Operand((stack_passed_arguments + 1) * kPointerSize)); |
| 3300 | ASSERT(IsPowerOf2(frame_alignment)); |
| 3301 | and_(sp, sp, Operand(-frame_alignment)); |
| 3302 | str(scratch, MemOperand(sp, stack_passed_arguments * kPointerSize)); |
| 3303 | } else { |
| 3304 | sub(sp, sp, Operand(stack_passed_arguments * kPointerSize)); |
| 3305 | } |
| 3306 | } |
| 3307 | |
| 3308 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 3309 | void MacroAssembler::PrepareCallCFunction(int num_reg_arguments, |
| 3310 | Register scratch) { |
| 3311 | PrepareCallCFunction(num_reg_arguments, 0, scratch); |
| 3312 | } |
| 3313 | |
| 3314 | |
| 3315 | void MacroAssembler::SetCallCDoubleArguments(DoubleRegister dreg) { |
| 3316 | if (use_eabi_hardfloat()) { |
| 3317 | Move(d0, dreg); |
| 3318 | } else { |
| 3319 | vmov(r0, r1, dreg); |
| 3320 | } |
| 3321 | } |
| 3322 | |
| 3323 | |
| 3324 | void MacroAssembler::SetCallCDoubleArguments(DoubleRegister dreg1, |
| 3325 | DoubleRegister dreg2) { |
| 3326 | if (use_eabi_hardfloat()) { |
| 3327 | if (dreg2.is(d0)) { |
| 3328 | ASSERT(!dreg1.is(d1)); |
| 3329 | Move(d1, dreg2); |
| 3330 | Move(d0, dreg1); |
| 3331 | } else { |
| 3332 | Move(d0, dreg1); |
| 3333 | Move(d1, dreg2); |
| 3334 | } |
| 3335 | } else { |
| 3336 | vmov(r0, r1, dreg1); |
| 3337 | vmov(r2, r3, dreg2); |
| 3338 | } |
| 3339 | } |
| 3340 | |
| 3341 | |
| 3342 | void MacroAssembler::SetCallCDoubleArguments(DoubleRegister dreg, |
| 3343 | Register reg) { |
| 3344 | if (use_eabi_hardfloat()) { |
| 3345 | Move(d0, dreg); |
| 3346 | Move(r0, reg); |
| 3347 | } else { |
| 3348 | Move(r2, reg); |
| 3349 | vmov(r0, r1, dreg); |
| 3350 | } |
| 3351 | } |
| 3352 | |
| 3353 | |
| 3354 | void MacroAssembler::CallCFunction(ExternalReference function, |
| 3355 | int num_reg_arguments, |
| 3356 | int num_double_arguments) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 3357 | mov(ip, Operand(function)); |
| 3358 | CallCFunctionHelper(ip, num_reg_arguments, num_double_arguments); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 3359 | } |
| 3360 | |
| 3361 | |
| 3362 | void MacroAssembler::CallCFunction(Register function, |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 3363 | int num_reg_arguments, |
| 3364 | int num_double_arguments) { |
| 3365 | CallCFunctionHelper(function, num_reg_arguments, num_double_arguments); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 3366 | } |
| 3367 | |
| 3368 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3369 | void MacroAssembler::CallCFunction(ExternalReference function, |
| 3370 | int num_arguments) { |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 3371 | CallCFunction(function, num_arguments, 0); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 3372 | } |
| 3373 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 3374 | |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 3375 | void MacroAssembler::CallCFunction(Register function, |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 3376 | int num_arguments) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 3377 | CallCFunction(function, num_arguments, 0); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3378 | } |
| 3379 | |
| 3380 | |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 3381 | void MacroAssembler::CallCFunctionHelper(Register function, |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 3382 | int num_reg_arguments, |
| 3383 | int num_double_arguments) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 3384 | ASSERT(has_frame()); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3385 | // Make sure that the stack is aligned before calling a C function unless |
| 3386 | // running in the simulator. The simulator has its own alignment check which |
| 3387 | // provides more information. |
| 3388 | #if defined(V8_HOST_ARCH_ARM) |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 3389 | if (emit_debug_code()) { |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3390 | int frame_alignment = OS::ActivationFrameAlignment(); |
| 3391 | int frame_alignment_mask = frame_alignment - 1; |
| 3392 | if (frame_alignment > kPointerSize) { |
| 3393 | ASSERT(IsPowerOf2(frame_alignment)); |
| 3394 | Label alignment_as_expected; |
| 3395 | tst(sp, Operand(frame_alignment_mask)); |
| 3396 | b(eq, &alignment_as_expected); |
| 3397 | // Don't use Check here, as it will call Runtime_Abort possibly |
| 3398 | // re-entering here. |
| 3399 | stop("Unexpected alignment"); |
| 3400 | bind(&alignment_as_expected); |
| 3401 | } |
| 3402 | } |
| 3403 | #endif |
| 3404 | |
| 3405 | // Just call directly. The function called cannot cause a GC, or |
| 3406 | // allow preemption, so the return address in the link register |
| 3407 | // stays correct. |
| 3408 | Call(function); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 3409 | int stack_passed_arguments = CalculateStackPassedWords( |
| 3410 | num_reg_arguments, num_double_arguments); |
| 3411 | if (ActivationFrameAlignment() > kPointerSize) { |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 3412 | ldr(sp, MemOperand(sp, stack_passed_arguments * kPointerSize)); |
| 3413 | } else { |
| 3414 | add(sp, sp, Operand(stack_passed_arguments * sizeof(kPointerSize))); |
| 3415 | } |
| 3416 | } |
| 3417 | |
| 3418 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 3419 | void MacroAssembler::GetRelocatedValueLocation(Register ldr_location, |
| 3420 | Register result) { |
| 3421 | const uint32_t kLdrOffsetMask = (1 << 12) - 1; |
| 3422 | const int32_t kPCRegOffset = 2 * kPointerSize; |
| 3423 | ldr(result, MemOperand(ldr_location)); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 3424 | if (emit_debug_code()) { |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 3425 | // Check that the instruction is a ldr reg, [pc + offset] . |
| 3426 | and_(result, result, Operand(kLdrPCPattern)); |
| 3427 | cmp(result, Operand(kLdrPCPattern)); |
| 3428 | Check(eq, "The instruction to patch should be a load from pc."); |
| 3429 | // Result was clobbered. Restore it. |
| 3430 | ldr(result, MemOperand(ldr_location)); |
| 3431 | } |
| 3432 | // Get the address of the constant. |
| 3433 | and_(result, result, Operand(kLdrOffsetMask)); |
| 3434 | add(result, ldr_location, Operand(result)); |
| 3435 | add(result, result, Operand(kPCRegOffset)); |
| 3436 | } |
| 3437 | |
| 3438 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 3439 | void MacroAssembler::CheckPageFlag( |
| 3440 | Register object, |
| 3441 | Register scratch, |
| 3442 | int mask, |
| 3443 | Condition cc, |
| 3444 | Label* condition_met) { |
| 3445 | and_(scratch, object, Operand(~Page::kPageAlignmentMask)); |
| 3446 | ldr(scratch, MemOperand(scratch, MemoryChunk::kFlagsOffset)); |
| 3447 | tst(scratch, Operand(mask)); |
| 3448 | b(cc, condition_met); |
| 3449 | } |
| 3450 | |
| 3451 | |
| 3452 | void MacroAssembler::JumpIfBlack(Register object, |
| 3453 | Register scratch0, |
| 3454 | Register scratch1, |
| 3455 | Label* on_black) { |
| 3456 | HasColor(object, scratch0, scratch1, on_black, 1, 0); // kBlackBitPattern. |
| 3457 | ASSERT(strcmp(Marking::kBlackBitPattern, "10") == 0); |
| 3458 | } |
| 3459 | |
| 3460 | |
| 3461 | void MacroAssembler::HasColor(Register object, |
| 3462 | Register bitmap_scratch, |
| 3463 | Register mask_scratch, |
| 3464 | Label* has_color, |
| 3465 | int first_bit, |
| 3466 | int second_bit) { |
| 3467 | ASSERT(!AreAliased(object, bitmap_scratch, mask_scratch, no_reg)); |
| 3468 | |
| 3469 | GetMarkBits(object, bitmap_scratch, mask_scratch); |
| 3470 | |
| 3471 | Label other_color, word_boundary; |
| 3472 | ldr(ip, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize)); |
| 3473 | tst(ip, Operand(mask_scratch)); |
| 3474 | b(first_bit == 1 ? eq : ne, &other_color); |
| 3475 | // Shift left 1 by adding. |
| 3476 | add(mask_scratch, mask_scratch, Operand(mask_scratch), SetCC); |
| 3477 | b(eq, &word_boundary); |
| 3478 | tst(ip, Operand(mask_scratch)); |
| 3479 | b(second_bit == 1 ? ne : eq, has_color); |
| 3480 | jmp(&other_color); |
| 3481 | |
| 3482 | bind(&word_boundary); |
| 3483 | ldr(ip, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize + kPointerSize)); |
| 3484 | tst(ip, Operand(1)); |
| 3485 | b(second_bit == 1 ? ne : eq, has_color); |
| 3486 | bind(&other_color); |
| 3487 | } |
| 3488 | |
| 3489 | |
| 3490 | // Detect some, but not all, common pointer-free objects. This is used by the |
| 3491 | // incremental write barrier which doesn't care about oddballs (they are always |
| 3492 | // marked black immediately so this code is not hit). |
| 3493 | void MacroAssembler::JumpIfDataObject(Register value, |
| 3494 | Register scratch, |
| 3495 | Label* not_data_object) { |
| 3496 | Label is_data_object; |
| 3497 | ldr(scratch, FieldMemOperand(value, HeapObject::kMapOffset)); |
| 3498 | CompareRoot(scratch, Heap::kHeapNumberMapRootIndex); |
| 3499 | b(eq, &is_data_object); |
| 3500 | ASSERT(kIsIndirectStringTag == 1 && kIsIndirectStringMask == 1); |
| 3501 | ASSERT(kNotStringTag == 0x80 && kIsNotStringMask == 0x80); |
| 3502 | // If it's a string and it's not a cons string then it's an object containing |
| 3503 | // no GC pointers. |
| 3504 | ldrb(scratch, FieldMemOperand(scratch, Map::kInstanceTypeOffset)); |
| 3505 | tst(scratch, Operand(kIsIndirectStringMask | kIsNotStringMask)); |
| 3506 | b(ne, not_data_object); |
| 3507 | bind(&is_data_object); |
| 3508 | } |
| 3509 | |
| 3510 | |
| 3511 | void MacroAssembler::GetMarkBits(Register addr_reg, |
| 3512 | Register bitmap_reg, |
| 3513 | Register mask_reg) { |
| 3514 | ASSERT(!AreAliased(addr_reg, bitmap_reg, mask_reg, no_reg)); |
| 3515 | and_(bitmap_reg, addr_reg, Operand(~Page::kPageAlignmentMask)); |
| 3516 | Ubfx(mask_reg, addr_reg, kPointerSizeLog2, Bitmap::kBitsPerCellLog2); |
| 3517 | const int kLowBits = kPointerSizeLog2 + Bitmap::kBitsPerCellLog2; |
| 3518 | Ubfx(ip, addr_reg, kLowBits, kPageSizeBits - kLowBits); |
| 3519 | add(bitmap_reg, bitmap_reg, Operand(ip, LSL, kPointerSizeLog2)); |
| 3520 | mov(ip, Operand(1)); |
| 3521 | mov(mask_reg, Operand(ip, LSL, mask_reg)); |
| 3522 | } |
| 3523 | |
| 3524 | |
| 3525 | void MacroAssembler::EnsureNotWhite( |
| 3526 | Register value, |
| 3527 | Register bitmap_scratch, |
| 3528 | Register mask_scratch, |
| 3529 | Register load_scratch, |
| 3530 | Label* value_is_white_and_not_data) { |
| 3531 | ASSERT(!AreAliased(value, bitmap_scratch, mask_scratch, ip)); |
| 3532 | GetMarkBits(value, bitmap_scratch, mask_scratch); |
| 3533 | |
| 3534 | // If the value is black or grey we don't need to do anything. |
| 3535 | ASSERT(strcmp(Marking::kWhiteBitPattern, "00") == 0); |
| 3536 | ASSERT(strcmp(Marking::kBlackBitPattern, "10") == 0); |
| 3537 | ASSERT(strcmp(Marking::kGreyBitPattern, "11") == 0); |
| 3538 | ASSERT(strcmp(Marking::kImpossibleBitPattern, "01") == 0); |
| 3539 | |
| 3540 | Label done; |
| 3541 | |
| 3542 | // Since both black and grey have a 1 in the first position and white does |
| 3543 | // not have a 1 there we only need to check one bit. |
| 3544 | ldr(load_scratch, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize)); |
| 3545 | tst(mask_scratch, load_scratch); |
| 3546 | b(ne, &done); |
| 3547 | |
| 3548 | if (emit_debug_code()) { |
| 3549 | // Check for impossible bit pattern. |
| 3550 | Label ok; |
| 3551 | // LSL may overflow, making the check conservative. |
| 3552 | tst(load_scratch, Operand(mask_scratch, LSL, 1)); |
| 3553 | b(eq, &ok); |
| 3554 | stop("Impossible marking bit pattern"); |
| 3555 | bind(&ok); |
| 3556 | } |
| 3557 | |
| 3558 | // Value is white. We check whether it is data that doesn't need scanning. |
| 3559 | // Currently only checks for HeapNumber and non-cons strings. |
| 3560 | Register map = load_scratch; // Holds map while checking type. |
| 3561 | Register length = load_scratch; // Holds length of object after testing type. |
| 3562 | Label is_data_object; |
| 3563 | |
| 3564 | // Check for heap-number |
| 3565 | ldr(map, FieldMemOperand(value, HeapObject::kMapOffset)); |
| 3566 | CompareRoot(map, Heap::kHeapNumberMapRootIndex); |
| 3567 | mov(length, Operand(HeapNumber::kSize), LeaveCC, eq); |
| 3568 | b(eq, &is_data_object); |
| 3569 | |
| 3570 | // Check for strings. |
| 3571 | ASSERT(kIsIndirectStringTag == 1 && kIsIndirectStringMask == 1); |
| 3572 | ASSERT(kNotStringTag == 0x80 && kIsNotStringMask == 0x80); |
| 3573 | // If it's a string and it's not a cons string then it's an object containing |
| 3574 | // no GC pointers. |
| 3575 | Register instance_type = load_scratch; |
| 3576 | ldrb(instance_type, FieldMemOperand(map, Map::kInstanceTypeOffset)); |
| 3577 | tst(instance_type, Operand(kIsIndirectStringMask | kIsNotStringMask)); |
| 3578 | b(ne, value_is_white_and_not_data); |
| 3579 | // It's a non-indirect (non-cons and non-slice) string. |
| 3580 | // If it's external, the length is just ExternalString::kSize. |
| 3581 | // Otherwise it's String::kHeaderSize + string->length() * (1 or 2). |
| 3582 | // External strings are the only ones with the kExternalStringTag bit |
| 3583 | // set. |
| 3584 | ASSERT_EQ(0, kSeqStringTag & kExternalStringTag); |
| 3585 | ASSERT_EQ(0, kConsStringTag & kExternalStringTag); |
| 3586 | tst(instance_type, Operand(kExternalStringTag)); |
| 3587 | mov(length, Operand(ExternalString::kSize), LeaveCC, ne); |
| 3588 | b(ne, &is_data_object); |
| 3589 | |
| 3590 | // Sequential string, either ASCII or UC16. |
| 3591 | // For ASCII (char-size of 1) we shift the smi tag away to get the length. |
| 3592 | // For UC16 (char-size of 2) we just leave the smi tag in place, thereby |
| 3593 | // getting the length multiplied by 2. |
| 3594 | ASSERT(kAsciiStringTag == 4 && kStringEncodingMask == 4); |
| 3595 | ASSERT(kSmiTag == 0 && kSmiTagSize == 1); |
| 3596 | ldr(ip, FieldMemOperand(value, String::kLengthOffset)); |
| 3597 | tst(instance_type, Operand(kStringEncodingMask)); |
| 3598 | mov(ip, Operand(ip, LSR, 1), LeaveCC, ne); |
| 3599 | add(length, ip, Operand(SeqString::kHeaderSize + kObjectAlignmentMask)); |
| 3600 | and_(length, length, Operand(~kObjectAlignmentMask)); |
| 3601 | |
| 3602 | bind(&is_data_object); |
| 3603 | // Value is a data object, and it is white. Mark it black. Since we know |
| 3604 | // that the object is white we can make it black by flipping one bit. |
| 3605 | ldr(ip, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize)); |
| 3606 | orr(ip, ip, Operand(mask_scratch)); |
| 3607 | str(ip, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize)); |
| 3608 | |
| 3609 | and_(bitmap_scratch, bitmap_scratch, Operand(~Page::kPageAlignmentMask)); |
| 3610 | ldr(ip, MemOperand(bitmap_scratch, MemoryChunk::kLiveBytesOffset)); |
| 3611 | add(ip, ip, Operand(length)); |
| 3612 | str(ip, MemOperand(bitmap_scratch, MemoryChunk::kLiveBytesOffset)); |
| 3613 | |
| 3614 | bind(&done); |
| 3615 | } |
| 3616 | |
| 3617 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 3618 | void MacroAssembler::ClampUint8(Register output_reg, Register input_reg) { |
| 3619 | Usat(output_reg, 8, Operand(input_reg)); |
| 3620 | } |
| 3621 | |
| 3622 | |
| 3623 | void MacroAssembler::ClampDoubleToUint8(Register result_reg, |
| 3624 | DoubleRegister input_reg, |
| 3625 | DoubleRegister temp_double_reg) { |
| 3626 | Label above_zero; |
| 3627 | Label done; |
| 3628 | Label in_bounds; |
| 3629 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 3630 | Vmov(temp_double_reg, 0.0); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 3631 | VFPCompareAndSetFlags(input_reg, temp_double_reg); |
| 3632 | b(gt, &above_zero); |
| 3633 | |
| 3634 | // Double value is less than zero, NaN or Inf, return 0. |
| 3635 | mov(result_reg, Operand(0)); |
| 3636 | b(al, &done); |
| 3637 | |
| 3638 | // Double value is >= 255, return 255. |
| 3639 | bind(&above_zero); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 3640 | Vmov(temp_double_reg, 255.0); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 3641 | VFPCompareAndSetFlags(input_reg, temp_double_reg); |
| 3642 | b(le, &in_bounds); |
| 3643 | mov(result_reg, Operand(255)); |
| 3644 | b(al, &done); |
| 3645 | |
| 3646 | // In 0-255 range, round and truncate. |
| 3647 | bind(&in_bounds); |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 3648 | Vmov(temp_double_reg, 0.5); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 3649 | vadd(temp_double_reg, input_reg, temp_double_reg); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 3650 | vcvt_u32_f64(temp_double_reg.low(), temp_double_reg); |
| 3651 | vmov(result_reg, temp_double_reg.low()); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 3652 | bind(&done); |
| 3653 | } |
| 3654 | |
| 3655 | |
| 3656 | void MacroAssembler::LoadInstanceDescriptors(Register map, |
| 3657 | Register descriptors) { |
| 3658 | ldr(descriptors, |
| 3659 | FieldMemOperand(map, Map::kInstanceDescriptorsOrBitField3Offset)); |
| 3660 | Label not_smi; |
| 3661 | JumpIfNotSmi(descriptors, ¬_smi); |
| 3662 | mov(descriptors, Operand(FACTORY->empty_descriptor_array())); |
| 3663 | bind(¬_smi); |
| 3664 | } |
| 3665 | |
| 3666 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame^] | 3667 | void MacroAssembler::CheckEnumCache(Register null_value, Label* call_runtime) { |
| 3668 | Label next; |
| 3669 | // Preload a couple of values used in the loop. |
| 3670 | Register empty_fixed_array_value = r6; |
| 3671 | LoadRoot(empty_fixed_array_value, Heap::kEmptyFixedArrayRootIndex); |
| 3672 | Register empty_descriptor_array_value = r7; |
| 3673 | LoadRoot(empty_descriptor_array_value, |
| 3674 | Heap::kEmptyDescriptorArrayRootIndex); |
| 3675 | mov(r1, r0); |
| 3676 | bind(&next); |
| 3677 | |
| 3678 | // Check that there are no elements. Register r1 contains the |
| 3679 | // current JS object we've reached through the prototype chain. |
| 3680 | ldr(r2, FieldMemOperand(r1, JSObject::kElementsOffset)); |
| 3681 | cmp(r2, empty_fixed_array_value); |
| 3682 | b(ne, call_runtime); |
| 3683 | |
| 3684 | // Check that instance descriptors are not empty so that we can |
| 3685 | // check for an enum cache. Leave the map in r2 for the subsequent |
| 3686 | // prototype load. |
| 3687 | ldr(r2, FieldMemOperand(r1, HeapObject::kMapOffset)); |
| 3688 | ldr(r3, FieldMemOperand(r2, Map::kInstanceDescriptorsOrBitField3Offset)); |
| 3689 | JumpIfSmi(r3, call_runtime); |
| 3690 | |
| 3691 | // Check that there is an enum cache in the non-empty instance |
| 3692 | // descriptors (r3). This is the case if the next enumeration |
| 3693 | // index field does not contain a smi. |
| 3694 | ldr(r3, FieldMemOperand(r3, DescriptorArray::kEnumerationIndexOffset)); |
| 3695 | JumpIfSmi(r3, call_runtime); |
| 3696 | |
| 3697 | // For all objects but the receiver, check that the cache is empty. |
| 3698 | Label check_prototype; |
| 3699 | cmp(r1, r0); |
| 3700 | b(eq, &check_prototype); |
| 3701 | ldr(r3, FieldMemOperand(r3, DescriptorArray::kEnumCacheBridgeCacheOffset)); |
| 3702 | cmp(r3, empty_fixed_array_value); |
| 3703 | b(ne, call_runtime); |
| 3704 | |
| 3705 | // Load the prototype from the map and loop if non-null. |
| 3706 | bind(&check_prototype); |
| 3707 | ldr(r1, FieldMemOperand(r2, Map::kPrototypeOffset)); |
| 3708 | cmp(r1, null_value); |
| 3709 | b(ne, &next); |
| 3710 | } |
| 3711 | |
| 3712 | |
| 3713 | bool AreAliased(Register r1, Register r2, Register r3, Register r4) { |
| 3714 | if (r1.is(r2)) return true; |
| 3715 | if (r1.is(r3)) return true; |
| 3716 | if (r1.is(r4)) return true; |
| 3717 | if (r2.is(r3)) return true; |
| 3718 | if (r2.is(r4)) return true; |
| 3719 | if (r3.is(r4)) return true; |
| 3720 | return false; |
| 3721 | } |
| 3722 | |
| 3723 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3724 | CodePatcher::CodePatcher(byte* address, int instructions) |
| 3725 | : address_(address), |
| 3726 | instructions_(instructions), |
| 3727 | size_(instructions * Assembler::kInstrSize), |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 3728 | masm_(Isolate::Current(), address, size_ + Assembler::kGap) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3729 | // Create a new macro assembler pointing to the address of the code to patch. |
| 3730 | // The size is adjusted with kGap on order for the assembler to generate size |
| 3731 | // bytes of instructions without failing with buffer size constraints. |
| 3732 | ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap); |
| 3733 | } |
| 3734 | |
| 3735 | |
| 3736 | CodePatcher::~CodePatcher() { |
| 3737 | // Indicate that code has changed. |
| 3738 | CPU::FlushICache(address_, size_); |
| 3739 | |
| 3740 | // Check that the code was patched as expected. |
| 3741 | ASSERT(masm_.pc_ == address_ + size_); |
| 3742 | ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap); |
| 3743 | } |
| 3744 | |
| 3745 | |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 3746 | void CodePatcher::Emit(Instr instr) { |
| 3747 | masm()->emit(instr); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3748 | } |
| 3749 | |
| 3750 | |
| 3751 | void CodePatcher::Emit(Address addr) { |
| 3752 | masm()->emit(reinterpret_cast<Instr>(addr)); |
| 3753 | } |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 3754 | |
| 3755 | |
| 3756 | void CodePatcher::EmitCondition(Condition cond) { |
| 3757 | Instr instr = Assembler::instr_at(masm_.pc_); |
| 3758 | instr = (instr & ~kCondMask) | cond; |
| 3759 | masm_.emit(instr); |
| 3760 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 3761 | |
| 3762 | |
| 3763 | } } // namespace v8::internal |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 3764 | |
| 3765 | #endif // V8_TARGET_ARCH_ARM |