ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 1 | // Copyright 2006-2009 the V8 project authors. All rights reserved. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +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 | |
| 28 | #include "v8.h" |
| 29 | |
| 30 | #include "bootstrapper.h" |
| 31 | #include "codegen-inl.h" |
| 32 | #include "debug.h" |
| 33 | #include "runtime.h" |
| 34 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 35 | namespace v8 { |
| 36 | namespace internal { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 37 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 38 | MacroAssembler::MacroAssembler(void* buffer, int size) |
| 39 | : Assembler(buffer, size), |
| 40 | unresolved_(0), |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 41 | generating_stub_(false), |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 42 | allow_stub_calls_(true), |
| 43 | code_object_(Heap::undefined_value()) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 44 | } |
| 45 | |
| 46 | |
| 47 | // We always generate arm code, never thumb code, even if V8 is compiled to |
| 48 | // thumb, so we require inter-working support |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 49 | #if defined(__thumb__) && !defined(USE_THUMB_INTERWORK) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 50 | #error "flag -mthumb-interwork missing" |
| 51 | #endif |
| 52 | |
| 53 | |
| 54 | // We do not support thumb inter-working with an arm architecture not supporting |
| 55 | // the blx instruction (below v5t) |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 56 | #if defined(USE_THUMB_INTERWORK) |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 57 | #if !defined(__ARM_ARCH_5T__) && \ |
| 58 | !defined(__ARM_ARCH_5TE__) && \ |
| 59 | !defined(__ARM_ARCH_7A__) && \ |
| 60 | !defined(__ARM_ARCH_7__) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 61 | // add tests for other versions above v5t as required |
| 62 | #error "for thumb inter-working we require architecture v5t or above" |
| 63 | #endif |
| 64 | #endif |
| 65 | |
| 66 | |
| 67 | // Using blx may yield better code, so use it when required or when available |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 68 | #if defined(USE_THUMB_INTERWORK) || defined(__ARM_ARCH_5__) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 69 | #define USE_BLX 1 |
| 70 | #endif |
| 71 | |
| 72 | // Using bx does not yield better code, so use it only when required |
kasperl@chromium.org | 2abc450 | 2009-07-02 07:00:29 +0000 | [diff] [blame] | 73 | #if defined(USE_THUMB_INTERWORK) |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 74 | #define USE_BX 1 |
| 75 | #endif |
| 76 | |
| 77 | |
| 78 | void MacroAssembler::Jump(Register target, Condition cond) { |
| 79 | #if USE_BX |
| 80 | bx(target, cond); |
| 81 | #else |
| 82 | mov(pc, Operand(target), LeaveCC, cond); |
| 83 | #endif |
| 84 | } |
| 85 | |
| 86 | |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 87 | void MacroAssembler::Jump(intptr_t target, RelocInfo::Mode rmode, |
| 88 | Condition cond) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 89 | #if USE_BX |
| 90 | mov(ip, Operand(target, rmode), LeaveCC, cond); |
| 91 | bx(ip, cond); |
| 92 | #else |
| 93 | mov(pc, Operand(target, rmode), LeaveCC, cond); |
| 94 | #endif |
| 95 | } |
| 96 | |
| 97 | |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 98 | void MacroAssembler::Jump(byte* target, RelocInfo::Mode rmode, |
| 99 | Condition cond) { |
| 100 | ASSERT(!RelocInfo::IsCodeTarget(rmode)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 101 | Jump(reinterpret_cast<intptr_t>(target), rmode, cond); |
| 102 | } |
| 103 | |
| 104 | |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 105 | void MacroAssembler::Jump(Handle<Code> code, RelocInfo::Mode rmode, |
| 106 | Condition cond) { |
| 107 | ASSERT(RelocInfo::IsCodeTarget(rmode)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 108 | // 'code' is always generated ARM code, never THUMB code |
| 109 | Jump(reinterpret_cast<intptr_t>(code.location()), rmode, cond); |
| 110 | } |
| 111 | |
| 112 | |
| 113 | void MacroAssembler::Call(Register target, Condition cond) { |
| 114 | #if USE_BLX |
| 115 | blx(target, cond); |
| 116 | #else |
| 117 | // set lr for return at current pc + 8 |
| 118 | mov(lr, Operand(pc), LeaveCC, cond); |
| 119 | mov(pc, Operand(target), LeaveCC, cond); |
| 120 | #endif |
| 121 | } |
| 122 | |
| 123 | |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 124 | void MacroAssembler::Call(intptr_t target, RelocInfo::Mode rmode, |
| 125 | Condition cond) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 126 | // Set lr for return at current pc + 8. |
| 127 | mov(lr, Operand(pc), LeaveCC, cond); |
| 128 | // Emit a ldr<cond> pc, [pc + offset of target in constant pool]. |
| 129 | mov(pc, Operand(target, rmode), LeaveCC, cond); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 130 | // If USE_BLX is defined, we could emit a 'mov ip, target', followed by a |
| 131 | // 'blx ip'; however, the code would not be shorter than the above sequence |
| 132 | // and the target address of the call would be referenced by the first |
| 133 | // instruction rather than the second one, which would make it harder to patch |
| 134 | // (two instructions before the return address, instead of one). |
sgjesse@chromium.org | 911335c | 2009-08-19 12:59:44 +0000 | [diff] [blame] | 135 | ASSERT(kPatchReturnSequenceLength == sizeof(Instr)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 136 | } |
| 137 | |
| 138 | |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 139 | void MacroAssembler::Call(byte* target, RelocInfo::Mode rmode, |
| 140 | Condition cond) { |
| 141 | ASSERT(!RelocInfo::IsCodeTarget(rmode)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 142 | Call(reinterpret_cast<intptr_t>(target), rmode, cond); |
| 143 | } |
| 144 | |
| 145 | |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 146 | void MacroAssembler::Call(Handle<Code> code, RelocInfo::Mode rmode, |
| 147 | Condition cond) { |
| 148 | ASSERT(RelocInfo::IsCodeTarget(rmode)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 149 | // 'code' is always generated ARM code, never THUMB code |
| 150 | Call(reinterpret_cast<intptr_t>(code.location()), rmode, cond); |
| 151 | } |
| 152 | |
| 153 | |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 154 | void MacroAssembler::Ret(Condition cond) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 155 | #if USE_BX |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 156 | bx(lr, cond); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 157 | #else |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 158 | mov(pc, Operand(lr), LeaveCC, cond); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 159 | #endif |
| 160 | } |
| 161 | |
| 162 | |
ager@chromium.org | 8bb6058 | 2008-12-11 12:02:20 +0000 | [diff] [blame] | 163 | void MacroAssembler::SmiJumpTable(Register index, Vector<Label*> targets) { |
| 164 | // Empty the const pool. |
| 165 | CheckConstPool(true, true); |
| 166 | add(pc, pc, Operand(index, |
| 167 | LSL, |
| 168 | assembler::arm::Instr::kInstrSizeLog2 - kSmiTagSize)); |
| 169 | BlockConstPoolBefore(pc_offset() + (targets.length() + 1) * sizeof(Instr)); |
| 170 | nop(); // Jump table alignment. |
| 171 | for (int i = 0; i < targets.length(); i++) { |
| 172 | b(targets[i]); |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | |
ager@chromium.org | ab99eea | 2009-08-25 07:05:41 +0000 | [diff] [blame^] | 177 | void MacroAssembler::LoadRoot(Register destination, |
| 178 | Heap::RootListIndex index, |
| 179 | Condition cond) { |
| 180 | ldr(destination, MemOperand(r10, index << kPointerSizeLog2), cond); |
| 181 | } |
| 182 | |
| 183 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 184 | // Will clobber 4 registers: object, offset, scratch, ip. The |
| 185 | // register 'object' contains a heap object pointer. The heap object |
| 186 | // tag is shifted away. |
| 187 | void MacroAssembler::RecordWrite(Register object, Register offset, |
| 188 | Register scratch) { |
| 189 | // This is how much we shift the remembered set bit offset to get the |
| 190 | // offset of the word in the remembered set. We divide by kBitsPerInt (32, |
| 191 | // shift right 5) and then multiply by kIntSize (4, shift left 2). |
| 192 | const int kRSetWordShift = 3; |
| 193 | |
| 194 | Label fast, done; |
| 195 | |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 196 | // First, test that the object is not in the new space. We cannot set |
| 197 | // remembered set bits in the new space. |
| 198 | // object: heap object pointer (with tag) |
| 199 | // offset: offset to store location from the object |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 200 | and_(scratch, object, Operand(Heap::NewSpaceMask())); |
| 201 | cmp(scratch, Operand(ExternalReference::new_space_start())); |
| 202 | b(eq, &done); |
| 203 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 204 | // Compute the bit offset in the remembered set. |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 205 | // object: heap object pointer (with tag) |
| 206 | // offset: offset to store location from the object |
| 207 | mov(ip, Operand(Page::kPageAlignmentMask)); // load mask only once |
| 208 | and_(scratch, object, Operand(ip)); // offset into page of the object |
| 209 | add(offset, scratch, Operand(offset)); // add offset into the object |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 210 | mov(offset, Operand(offset, LSR, kObjectAlignmentBits)); |
| 211 | |
| 212 | // Compute the page address from the heap object pointer. |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 213 | // object: heap object pointer (with tag) |
| 214 | // offset: bit offset of store position in the remembered set |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 215 | bic(object, object, Operand(ip)); |
| 216 | |
| 217 | // If the bit offset lies beyond the normal remembered set range, it is in |
| 218 | // the extra remembered set area of a large object. |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 219 | // object: page start |
| 220 | // offset: bit offset of store position in the remembered set |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 221 | cmp(offset, Operand(Page::kPageSize / kPointerSize)); |
| 222 | b(lt, &fast); |
| 223 | |
| 224 | // Adjust the bit offset to be relative to the start of the extra |
| 225 | // remembered set and the start address to be the address of the extra |
| 226 | // remembered set. |
| 227 | sub(offset, offset, Operand(Page::kPageSize / kPointerSize)); |
| 228 | // Load the array length into 'scratch' and multiply by four to get the |
| 229 | // size in bytes of the elements. |
| 230 | ldr(scratch, MemOperand(object, Page::kObjectStartOffset |
| 231 | + FixedArray::kLengthOffset)); |
| 232 | mov(scratch, Operand(scratch, LSL, kObjectAlignmentBits)); |
| 233 | // Add the page header (including remembered set), array header, and array |
| 234 | // body size to the page address. |
| 235 | add(object, object, Operand(Page::kObjectStartOffset |
kasperl@chromium.org | e959c18 | 2009-07-27 08:59:04 +0000 | [diff] [blame] | 236 | + FixedArray::kHeaderSize)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 237 | add(object, object, Operand(scratch)); |
| 238 | |
| 239 | bind(&fast); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 240 | // Get address of the rset word. |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 241 | // object: start of the remembered set (page start for the fast case) |
| 242 | // offset: bit offset of store position in the remembered set |
| 243 | bic(scratch, offset, Operand(kBitsPerInt - 1)); // clear the bit offset |
| 244 | add(object, object, Operand(scratch, LSR, kRSetWordShift)); |
| 245 | // Get bit offset in the rset word. |
| 246 | // object: address of remembered set word |
| 247 | // offset: bit offset of store position |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 248 | and_(offset, offset, Operand(kBitsPerInt - 1)); |
| 249 | |
| 250 | ldr(scratch, MemOperand(object)); |
| 251 | mov(ip, Operand(1)); |
| 252 | orr(scratch, scratch, Operand(ip, LSL, offset)); |
| 253 | str(scratch, MemOperand(object)); |
| 254 | |
| 255 | bind(&done); |
| 256 | } |
| 257 | |
| 258 | |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 259 | void MacroAssembler::EnterFrame(StackFrame::Type type) { |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 260 | // r0-r3: preserved |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 261 | stm(db_w, sp, cp.bit() | fp.bit() | lr.bit()); |
| 262 | mov(ip, Operand(Smi::FromInt(type))); |
| 263 | push(ip); |
kasperl@chromium.org | 061ef74 | 2009-02-27 12:16:20 +0000 | [diff] [blame] | 264 | mov(ip, Operand(CodeObject())); |
| 265 | push(ip); |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 266 | add(fp, sp, Operand(3 * kPointerSize)); // Adjust FP to point to saved FP. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 267 | } |
| 268 | |
| 269 | |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 270 | void MacroAssembler::LeaveFrame(StackFrame::Type type) { |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 271 | // r0: preserved |
| 272 | // r1: preserved |
| 273 | // r2: preserved |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 274 | |
ager@chromium.org | 7c537e2 | 2008-10-16 08:43:32 +0000 | [diff] [blame] | 275 | // Drop the execution stack down to the frame pointer and restore |
| 276 | // the caller frame pointer and return address. |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 277 | mov(sp, fp); |
| 278 | ldm(ia_w, sp, fp.bit() | lr.bit()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 279 | } |
| 280 | |
| 281 | |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 282 | void MacroAssembler::EnterExitFrame(StackFrame::Type type) { |
| 283 | ASSERT(type == StackFrame::EXIT || type == StackFrame::EXIT_DEBUG); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 284 | |
| 285 | // Compute the argv pointer and keep it in a callee-saved register. |
| 286 | // r0 is argc. |
| 287 | add(r6, sp, Operand(r0, LSL, kPointerSizeLog2)); |
| 288 | sub(r6, r6, Operand(kPointerSize)); |
| 289 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 290 | // Compute callee's stack pointer before making changes and save it as |
| 291 | // ip register so that it is restored as sp register on exit, thereby |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 292 | // popping the args. |
| 293 | |
| 294 | // ip = sp + kPointerSize * #args; |
| 295 | add(ip, sp, Operand(r0, LSL, kPointerSizeLog2)); |
| 296 | |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 297 | // Align the stack at this point. After this point we have 5 pushes, |
| 298 | // so in fact we have to unalign here! See also the assert on the |
| 299 | // alignment immediately below. |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 300 | #if defined(V8_HOST_ARCH_ARM) |
| 301 | // Running on the real platform. Use the alignment as mandated by the local |
| 302 | // environment. |
| 303 | // Note: This will break if we ever start generating snapshots on one ARM |
| 304 | // platform for another ARM platform with a different alignment. |
| 305 | int activation_frame_alignment = OS::ActivationFrameAlignment(); |
| 306 | #else // defined(V8_HOST_ARCH_ARM) |
| 307 | // If we are using the simulator then we should always align to the expected |
| 308 | // alignment. As the simulator is used to generate snapshots we do not know |
| 309 | // if the target platform will need alignment, so we will always align at |
| 310 | // this point here. |
| 311 | int activation_frame_alignment = 2 * kPointerSize; |
| 312 | #endif // defined(V8_HOST_ARCH_ARM) |
| 313 | if (activation_frame_alignment != kPointerSize) { |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 314 | // This code needs to be made more general if this assert doesn't hold. |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 315 | ASSERT(activation_frame_alignment == 2 * kPointerSize); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 316 | mov(r7, Operand(Smi::FromInt(0))); |
kasperl@chromium.org | 68ac009 | 2009-07-09 06:00:35 +0000 | [diff] [blame] | 317 | tst(sp, Operand(activation_frame_alignment - 1)); |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 318 | push(r7, eq); // Conditional push instruction. |
| 319 | } |
| 320 | |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 321 | // Push in reverse order: caller_fp, sp_on_exit, and caller_pc. |
| 322 | stm(db_w, sp, fp.bit() | ip.bit() | lr.bit()); |
| 323 | mov(fp, Operand(sp)); // setup new frame pointer |
| 324 | |
| 325 | // Push debug marker. |
| 326 | mov(ip, Operand(type == StackFrame::EXIT_DEBUG ? 1 : 0)); |
| 327 | push(ip); |
| 328 | |
| 329 | // Save the frame pointer and the context in top. |
| 330 | mov(ip, Operand(ExternalReference(Top::k_c_entry_fp_address))); |
| 331 | str(fp, MemOperand(ip)); |
| 332 | mov(ip, Operand(ExternalReference(Top::k_context_address))); |
| 333 | str(cp, MemOperand(ip)); |
| 334 | |
| 335 | // Setup argc and the builtin function in callee-saved registers. |
| 336 | mov(r4, Operand(r0)); |
| 337 | mov(r5, Operand(r1)); |
| 338 | |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 339 | |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 340 | #ifdef ENABLE_DEBUGGER_SUPPORT |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 341 | // Save the state of all registers to the stack from the memory |
| 342 | // location. This is needed to allow nested break points. |
| 343 | if (type == StackFrame::EXIT_DEBUG) { |
| 344 | // Use sp as base to push. |
| 345 | CopyRegistersFromMemoryToStack(sp, kJSCallerSaved); |
| 346 | } |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 347 | #endif |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 348 | } |
| 349 | |
| 350 | |
| 351 | void MacroAssembler::LeaveExitFrame(StackFrame::Type type) { |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 352 | #ifdef ENABLE_DEBUGGER_SUPPORT |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 353 | // Restore the memory copy of the registers by digging them out from |
| 354 | // the stack. This is needed to allow nested break points. |
| 355 | if (type == StackFrame::EXIT_DEBUG) { |
| 356 | // This code intentionally clobbers r2 and r3. |
| 357 | const int kCallerSavedSize = kNumJSCallerSaved * kPointerSize; |
| 358 | const int kOffset = ExitFrameConstants::kDebugMarkOffset - kCallerSavedSize; |
| 359 | add(r3, fp, Operand(kOffset)); |
| 360 | CopyRegistersFromStackToMemory(r3, r2, kJSCallerSaved); |
| 361 | } |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 362 | #endif |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 363 | |
| 364 | // Clear top frame. |
| 365 | mov(r3, Operand(0)); |
| 366 | mov(ip, Operand(ExternalReference(Top::k_c_entry_fp_address))); |
| 367 | str(r3, MemOperand(ip)); |
| 368 | |
| 369 | // Restore current context from top and clear it in debug mode. |
| 370 | mov(ip, Operand(ExternalReference(Top::k_context_address))); |
| 371 | ldr(cp, MemOperand(ip)); |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 372 | #ifdef DEBUG |
| 373 | str(r3, MemOperand(ip)); |
| 374 | #endif |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 375 | |
| 376 | // Pop the arguments, restore registers, and return. |
| 377 | mov(sp, Operand(fp)); // respect ABI stack constraint |
| 378 | ldm(ia, sp, fp.bit() | sp.bit() | pc.bit()); |
| 379 | } |
| 380 | |
| 381 | |
mads.s.ager@gmail.com | 769cc96 | 2008-08-06 10:02:49 +0000 | [diff] [blame] | 382 | void MacroAssembler::InvokePrologue(const ParameterCount& expected, |
| 383 | const ParameterCount& actual, |
| 384 | Handle<Code> code_constant, |
| 385 | Register code_reg, |
| 386 | Label* done, |
| 387 | InvokeFlag flag) { |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 388 | bool definitely_matches = false; |
| 389 | Label regular_invoke; |
| 390 | |
| 391 | // Check whether the expected and actual arguments count match. If not, |
| 392 | // setup registers according to contract with ArgumentsAdaptorTrampoline: |
| 393 | // r0: actual arguments count |
| 394 | // r1: function (passed through to callee) |
| 395 | // r2: expected arguments count |
| 396 | // r3: callee code entry |
| 397 | |
| 398 | // The code below is made a lot easier because the calling code already sets |
| 399 | // up actual and expected registers according to the contract if values are |
| 400 | // passed in registers. |
| 401 | ASSERT(actual.is_immediate() || actual.reg().is(r0)); |
| 402 | ASSERT(expected.is_immediate() || expected.reg().is(r2)); |
| 403 | ASSERT((!code_constant.is_null() && code_reg.is(no_reg)) || code_reg.is(r3)); |
| 404 | |
| 405 | if (expected.is_immediate()) { |
| 406 | ASSERT(actual.is_immediate()); |
| 407 | if (expected.immediate() == actual.immediate()) { |
| 408 | definitely_matches = true; |
| 409 | } else { |
| 410 | mov(r0, Operand(actual.immediate())); |
| 411 | const int sentinel = SharedFunctionInfo::kDontAdaptArgumentsSentinel; |
| 412 | if (expected.immediate() == sentinel) { |
| 413 | // Don't worry about adapting arguments for builtins that |
| 414 | // don't want that done. Skip adaption code by making it look |
| 415 | // like we have a match between expected and actual number of |
| 416 | // arguments. |
| 417 | definitely_matches = true; |
| 418 | } else { |
| 419 | mov(r2, Operand(expected.immediate())); |
| 420 | } |
mads.s.ager@gmail.com | 769cc96 | 2008-08-06 10:02:49 +0000 | [diff] [blame] | 421 | } |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 422 | } else { |
| 423 | if (actual.is_immediate()) { |
| 424 | cmp(expected.reg(), Operand(actual.immediate())); |
| 425 | b(eq, ®ular_invoke); |
| 426 | mov(r0, Operand(actual.immediate())); |
| 427 | } else { |
| 428 | cmp(expected.reg(), Operand(actual.reg())); |
| 429 | b(eq, ®ular_invoke); |
| 430 | } |
| 431 | } |
| 432 | |
| 433 | if (!definitely_matches) { |
| 434 | if (!code_constant.is_null()) { |
| 435 | mov(r3, Operand(code_constant)); |
| 436 | add(r3, r3, Operand(Code::kHeaderSize - kHeapObjectTag)); |
| 437 | } |
| 438 | |
| 439 | Handle<Code> adaptor = |
| 440 | Handle<Code>(Builtins::builtin(Builtins::ArgumentsAdaptorTrampoline)); |
| 441 | if (flag == CALL_FUNCTION) { |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 442 | Call(adaptor, RelocInfo::CODE_TARGET); |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 443 | b(done); |
| 444 | } else { |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 445 | Jump(adaptor, RelocInfo::CODE_TARGET); |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 446 | } |
| 447 | bind(®ular_invoke); |
mads.s.ager@gmail.com | 769cc96 | 2008-08-06 10:02:49 +0000 | [diff] [blame] | 448 | } |
| 449 | } |
| 450 | |
| 451 | |
| 452 | void MacroAssembler::InvokeCode(Register code, |
| 453 | const ParameterCount& expected, |
| 454 | const ParameterCount& actual, |
| 455 | InvokeFlag flag) { |
| 456 | Label done; |
| 457 | |
| 458 | InvokePrologue(expected, actual, Handle<Code>::null(), code, &done, flag); |
| 459 | if (flag == CALL_FUNCTION) { |
| 460 | Call(code); |
| 461 | } else { |
| 462 | ASSERT(flag == JUMP_FUNCTION); |
| 463 | Jump(code); |
| 464 | } |
| 465 | |
| 466 | // Continue here if InvokePrologue does handle the invocation due to |
| 467 | // mismatched parameter counts. |
| 468 | bind(&done); |
| 469 | } |
| 470 | |
| 471 | |
| 472 | void MacroAssembler::InvokeCode(Handle<Code> code, |
| 473 | const ParameterCount& expected, |
| 474 | const ParameterCount& actual, |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 475 | RelocInfo::Mode rmode, |
mads.s.ager@gmail.com | 769cc96 | 2008-08-06 10:02:49 +0000 | [diff] [blame] | 476 | InvokeFlag flag) { |
| 477 | Label done; |
| 478 | |
| 479 | InvokePrologue(expected, actual, code, no_reg, &done, flag); |
| 480 | if (flag == CALL_FUNCTION) { |
| 481 | Call(code, rmode); |
| 482 | } else { |
| 483 | Jump(code, rmode); |
| 484 | } |
| 485 | |
| 486 | // Continue here if InvokePrologue does handle the invocation due to |
| 487 | // mismatched parameter counts. |
| 488 | bind(&done); |
| 489 | } |
| 490 | |
| 491 | |
| 492 | void MacroAssembler::InvokeFunction(Register fun, |
| 493 | const ParameterCount& actual, |
| 494 | InvokeFlag flag) { |
| 495 | // Contract with called JS functions requires that function is passed in r1. |
| 496 | ASSERT(fun.is(r1)); |
| 497 | |
mads.s.ager@gmail.com | 769cc96 | 2008-08-06 10:02:49 +0000 | [diff] [blame] | 498 | Register expected_reg = r2; |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 499 | Register code_reg = r3; |
mads.s.ager@gmail.com | 769cc96 | 2008-08-06 10:02:49 +0000 | [diff] [blame] | 500 | |
| 501 | ldr(code_reg, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset)); |
| 502 | ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset)); |
| 503 | ldr(expected_reg, |
| 504 | FieldMemOperand(code_reg, |
| 505 | SharedFunctionInfo::kFormalParameterCountOffset)); |
| 506 | ldr(code_reg, |
| 507 | MemOperand(code_reg, SharedFunctionInfo::kCodeOffset - kHeapObjectTag)); |
| 508 | add(code_reg, code_reg, Operand(Code::kHeaderSize - kHeapObjectTag)); |
| 509 | |
| 510 | ParameterCount expected(expected_reg); |
| 511 | InvokeCode(code_reg, expected, actual, flag); |
| 512 | } |
| 513 | |
| 514 | |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 515 | #ifdef ENABLE_DEBUGGER_SUPPORT |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 516 | void MacroAssembler::SaveRegistersToMemory(RegList regs) { |
| 517 | ASSERT((regs & ~kJSCallerSaved) == 0); |
| 518 | // Copy the content of registers to memory location. |
| 519 | for (int i = 0; i < kNumJSCallerSaved; i++) { |
| 520 | int r = JSCallerSavedCode(i); |
| 521 | if ((regs & (1 << r)) != 0) { |
| 522 | Register reg = { r }; |
| 523 | mov(ip, Operand(ExternalReference(Debug_Address::Register(i)))); |
| 524 | str(reg, MemOperand(ip)); |
| 525 | } |
| 526 | } |
| 527 | } |
| 528 | |
| 529 | |
| 530 | void MacroAssembler::RestoreRegistersFromMemory(RegList regs) { |
| 531 | ASSERT((regs & ~kJSCallerSaved) == 0); |
| 532 | // Copy the content of memory location to registers. |
| 533 | for (int i = kNumJSCallerSaved; --i >= 0;) { |
| 534 | int r = JSCallerSavedCode(i); |
| 535 | if ((regs & (1 << r)) != 0) { |
| 536 | Register reg = { r }; |
| 537 | mov(ip, Operand(ExternalReference(Debug_Address::Register(i)))); |
| 538 | ldr(reg, MemOperand(ip)); |
| 539 | } |
| 540 | } |
| 541 | } |
| 542 | |
| 543 | |
| 544 | void MacroAssembler::CopyRegistersFromMemoryToStack(Register base, |
| 545 | RegList regs) { |
| 546 | ASSERT((regs & ~kJSCallerSaved) == 0); |
| 547 | // Copy the content of the memory location to the stack and adjust base. |
| 548 | for (int i = kNumJSCallerSaved; --i >= 0;) { |
| 549 | int r = JSCallerSavedCode(i); |
| 550 | if ((regs & (1 << r)) != 0) { |
| 551 | mov(ip, Operand(ExternalReference(Debug_Address::Register(i)))); |
| 552 | ldr(ip, MemOperand(ip)); |
| 553 | str(ip, MemOperand(base, 4, NegPreIndex)); |
| 554 | } |
| 555 | } |
| 556 | } |
| 557 | |
| 558 | |
| 559 | void MacroAssembler::CopyRegistersFromStackToMemory(Register base, |
| 560 | Register scratch, |
| 561 | RegList regs) { |
| 562 | ASSERT((regs & ~kJSCallerSaved) == 0); |
| 563 | // Copy the content of the stack to the memory location and adjust base. |
| 564 | for (int i = 0; i < kNumJSCallerSaved; i++) { |
| 565 | int r = JSCallerSavedCode(i); |
| 566 | if ((regs & (1 << r)) != 0) { |
| 567 | mov(ip, Operand(ExternalReference(Debug_Address::Register(i)))); |
| 568 | ldr(scratch, MemOperand(base, 4, PostIndex)); |
| 569 | str(scratch, MemOperand(ip)); |
| 570 | } |
| 571 | } |
| 572 | } |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 573 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 574 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 575 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 576 | void MacroAssembler::PushTryHandler(CodeLocation try_location, |
| 577 | HandlerType type) { |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 578 | // Adjust this code if not the case. |
| 579 | ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 580 | // The pc (return address) is passed in register lr. |
| 581 | if (try_location == IN_JAVASCRIPT) { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 582 | if (type == TRY_CATCH_HANDLER) { |
| 583 | mov(r3, Operand(StackHandler::TRY_CATCH)); |
| 584 | } else { |
| 585 | mov(r3, Operand(StackHandler::TRY_FINALLY)); |
| 586 | } |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 587 | ASSERT(StackHandlerConstants::kStateOffset == 1 * kPointerSize |
| 588 | && StackHandlerConstants::kFPOffset == 2 * kPointerSize |
| 589 | && StackHandlerConstants::kPCOffset == 3 * kPointerSize); |
| 590 | stm(db_w, sp, r3.bit() | fp.bit() | lr.bit()); |
| 591 | // Save the current handler as the next handler. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 592 | mov(r3, Operand(ExternalReference(Top::k_handler_address))); |
| 593 | ldr(r1, MemOperand(r3)); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 594 | ASSERT(StackHandlerConstants::kNextOffset == 0); |
| 595 | push(r1); |
| 596 | // Link this handler as the new current one. |
| 597 | str(sp, MemOperand(r3)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 598 | } else { |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 599 | // Must preserve r0-r4, r5-r7 are available. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 600 | ASSERT(try_location == IN_JS_ENTRY); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 601 | // The frame pointer does not point to a JS frame so we save NULL |
| 602 | // for fp. We expect the code throwing an exception to check fp |
| 603 | // before dereferencing it to restore the context. |
| 604 | mov(ip, Operand(0)); // To save a NULL frame pointer. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 605 | mov(r6, Operand(StackHandler::ENTRY)); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 606 | ASSERT(StackHandlerConstants::kStateOffset == 1 * kPointerSize |
| 607 | && StackHandlerConstants::kFPOffset == 2 * kPointerSize |
| 608 | && StackHandlerConstants::kPCOffset == 3 * kPointerSize); |
| 609 | stm(db_w, sp, r6.bit() | ip.bit() | lr.bit()); |
| 610 | // Save the current handler as the next handler. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 611 | mov(r7, Operand(ExternalReference(Top::k_handler_address))); |
| 612 | ldr(r6, MemOperand(r7)); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 613 | ASSERT(StackHandlerConstants::kNextOffset == 0); |
| 614 | push(r6); |
| 615 | // Link this handler as the new current one. |
| 616 | str(sp, MemOperand(r7)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 617 | } |
| 618 | } |
| 619 | |
| 620 | |
| 621 | Register MacroAssembler::CheckMaps(JSObject* object, Register object_reg, |
| 622 | JSObject* holder, Register holder_reg, |
| 623 | Register scratch, |
| 624 | Label* miss) { |
| 625 | // Make sure there's no overlap between scratch and the other |
| 626 | // registers. |
| 627 | ASSERT(!scratch.is(object_reg) && !scratch.is(holder_reg)); |
| 628 | |
| 629 | // Keep track of the current object in register reg. |
| 630 | Register reg = object_reg; |
| 631 | int depth = 1; |
| 632 | |
| 633 | // Check the maps in the prototype chain. |
| 634 | // Traverse the prototype chain from the object and do map checks. |
| 635 | while (object != holder) { |
| 636 | depth++; |
| 637 | |
| 638 | // Only global objects and objects that do not require access |
| 639 | // checks are allowed in stubs. |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 640 | ASSERT(object->IsJSGlobalProxy() || !object->IsAccessCheckNeeded()); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 641 | |
| 642 | // Get the map of the current object. |
| 643 | ldr(scratch, FieldMemOperand(reg, HeapObject::kMapOffset)); |
| 644 | cmp(scratch, Operand(Handle<Map>(object->map()))); |
| 645 | |
| 646 | // Branch on the result of the map check. |
| 647 | b(ne, miss); |
| 648 | |
| 649 | // Check access rights to the global object. This has to happen |
| 650 | // after the map check so that we know that the object is |
| 651 | // actually a global object. |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 652 | if (object->IsJSGlobalProxy()) { |
| 653 | CheckAccessGlobalProxy(reg, scratch, miss); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 654 | // Restore scratch register to be the map of the object. In the |
| 655 | // new space case below, we load the prototype from the map in |
| 656 | // the scratch register. |
| 657 | ldr(scratch, FieldMemOperand(reg, HeapObject::kMapOffset)); |
| 658 | } |
| 659 | |
| 660 | reg = holder_reg; // from now the object is in holder_reg |
| 661 | JSObject* prototype = JSObject::cast(object->GetPrototype()); |
| 662 | if (Heap::InNewSpace(prototype)) { |
| 663 | // The prototype is in new space; we cannot store a reference |
| 664 | // to it in the code. Load it from the map. |
| 665 | ldr(reg, FieldMemOperand(scratch, Map::kPrototypeOffset)); |
| 666 | } else { |
| 667 | // The prototype is in old space; load it directly. |
| 668 | mov(reg, Operand(Handle<JSObject>(prototype))); |
| 669 | } |
| 670 | |
| 671 | // Go to the next object in the prototype chain. |
| 672 | object = prototype; |
| 673 | } |
| 674 | |
| 675 | // Check the holder map. |
| 676 | ldr(scratch, FieldMemOperand(reg, HeapObject::kMapOffset)); |
| 677 | cmp(scratch, Operand(Handle<Map>(object->map()))); |
| 678 | b(ne, miss); |
| 679 | |
| 680 | // Log the check depth. |
| 681 | LOG(IntEvent("check-maps-depth", depth)); |
| 682 | |
| 683 | // Perform security check for access to the global object and return |
| 684 | // the holder register. |
| 685 | ASSERT(object == holder); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 686 | ASSERT(object->IsJSGlobalProxy() || !object->IsAccessCheckNeeded()); |
| 687 | if (object->IsJSGlobalProxy()) { |
| 688 | CheckAccessGlobalProxy(reg, scratch, miss); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 689 | } |
| 690 | return reg; |
| 691 | } |
| 692 | |
| 693 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 694 | void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg, |
| 695 | Register scratch, |
| 696 | Label* miss) { |
| 697 | Label same_contexts; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 698 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 699 | ASSERT(!holder_reg.is(scratch)); |
| 700 | ASSERT(!holder_reg.is(ip)); |
| 701 | ASSERT(!scratch.is(ip)); |
| 702 | |
| 703 | // Load current lexical context from the stack frame. |
| 704 | ldr(scratch, MemOperand(fp, StandardFrameConstants::kContextOffset)); |
| 705 | // In debug mode, make sure the lexical context is set. |
ager@chromium.org | 65dad4b | 2009-04-23 08:48:43 +0000 | [diff] [blame] | 706 | #ifdef DEBUG |
| 707 | cmp(scratch, Operand(0)); |
| 708 | Check(ne, "we should not have an empty lexical context"); |
| 709 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 710 | |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 711 | // Load the global context of the current context. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 712 | int offset = Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize; |
| 713 | ldr(scratch, FieldMemOperand(scratch, offset)); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 714 | ldr(scratch, FieldMemOperand(scratch, GlobalObject::kGlobalContextOffset)); |
| 715 | |
| 716 | // Check the context is a global context. |
| 717 | if (FLAG_debug_code) { |
| 718 | // TODO(119): avoid push(holder_reg)/pop(holder_reg) |
| 719 | // Cannot use ip as a temporary in this verification code. Due to the fact |
| 720 | // that ip is clobbered as part of cmp with an object Operand. |
| 721 | push(holder_reg); // Temporarily save holder on the stack. |
| 722 | // Read the first word and compare to the global_context_map. |
| 723 | ldr(holder_reg, FieldMemOperand(scratch, HeapObject::kMapOffset)); |
ager@chromium.org | ab99eea | 2009-08-25 07:05:41 +0000 | [diff] [blame^] | 724 | LoadRoot(ip, Heap::kGlobalContextMapRootIndex); |
| 725 | cmp(holder_reg, ip); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 726 | Check(eq, "JSGlobalObject::global_context should be a global context."); |
| 727 | pop(holder_reg); // Restore holder. |
| 728 | } |
| 729 | |
| 730 | // Check if both contexts are the same. |
| 731 | ldr(ip, FieldMemOperand(holder_reg, JSGlobalProxy::kContextOffset)); |
| 732 | cmp(scratch, Operand(ip)); |
| 733 | b(eq, &same_contexts); |
| 734 | |
| 735 | // Check the context is a global context. |
| 736 | if (FLAG_debug_code) { |
| 737 | // TODO(119): avoid push(holder_reg)/pop(holder_reg) |
| 738 | // Cannot use ip as a temporary in this verification code. Due to the fact |
| 739 | // that ip is clobbered as part of cmp with an object Operand. |
| 740 | push(holder_reg); // Temporarily save holder on the stack. |
| 741 | mov(holder_reg, ip); // Move ip to its holding place. |
ager@chromium.org | ab99eea | 2009-08-25 07:05:41 +0000 | [diff] [blame^] | 742 | LoadRoot(ip, Heap::kNullValueRootIndex); |
| 743 | cmp(holder_reg, ip); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 744 | Check(ne, "JSGlobalProxy::context() should not be null."); |
| 745 | |
| 746 | ldr(holder_reg, FieldMemOperand(holder_reg, HeapObject::kMapOffset)); |
ager@chromium.org | ab99eea | 2009-08-25 07:05:41 +0000 | [diff] [blame^] | 747 | LoadRoot(ip, Heap::kGlobalContextMapRootIndex); |
| 748 | cmp(holder_reg, ip); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 749 | Check(eq, "JSGlobalObject::global_context should be a global context."); |
| 750 | // Restore ip is not needed. ip is reloaded below. |
| 751 | pop(holder_reg); // Restore holder. |
| 752 | // Restore ip to holder's context. |
| 753 | ldr(ip, FieldMemOperand(holder_reg, JSGlobalProxy::kContextOffset)); |
| 754 | } |
| 755 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 756 | // Check that the security token in the calling global object is |
| 757 | // compatible with the security token in the receiving global |
| 758 | // object. |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 759 | int token_offset = Context::kHeaderSize + |
| 760 | Context::SECURITY_TOKEN_INDEX * kPointerSize; |
| 761 | |
| 762 | ldr(scratch, FieldMemOperand(scratch, token_offset)); |
| 763 | ldr(ip, FieldMemOperand(ip, token_offset)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 764 | cmp(scratch, Operand(ip)); |
| 765 | b(ne, miss); |
kasperl@chromium.org | 5a8ca6c | 2008-10-23 13:57:19 +0000 | [diff] [blame] | 766 | |
| 767 | bind(&same_contexts); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 768 | } |
| 769 | |
| 770 | |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 771 | void MacroAssembler::CompareObjectType(Register function, |
| 772 | Register map, |
| 773 | Register type_reg, |
| 774 | InstanceType type) { |
| 775 | ldr(map, FieldMemOperand(function, HeapObject::kMapOffset)); |
| 776 | ldrb(type_reg, FieldMemOperand(map, Map::kInstanceTypeOffset)); |
| 777 | cmp(type_reg, Operand(type)); |
| 778 | } |
| 779 | |
| 780 | |
| 781 | void MacroAssembler::TryGetFunctionPrototype(Register function, |
| 782 | Register result, |
| 783 | Register scratch, |
| 784 | Label* miss) { |
| 785 | // Check that the receiver isn't a smi. |
| 786 | BranchOnSmi(function, miss); |
| 787 | |
| 788 | // Check that the function really is a function. Load map into result reg. |
| 789 | CompareObjectType(function, result, scratch, JS_FUNCTION_TYPE); |
| 790 | b(ne, miss); |
| 791 | |
| 792 | // Make sure that the function has an instance prototype. |
| 793 | Label non_instance; |
| 794 | ldrb(scratch, FieldMemOperand(result, Map::kBitFieldOffset)); |
| 795 | tst(scratch, Operand(1 << Map::kHasNonInstancePrototype)); |
| 796 | b(ne, &non_instance); |
| 797 | |
| 798 | // Get the prototype or initial map from the function. |
| 799 | ldr(result, |
| 800 | FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset)); |
| 801 | |
| 802 | // If the prototype or initial map is the hole, don't return it and |
| 803 | // simply miss the cache instead. This will allow us to allocate a |
| 804 | // prototype object on-demand in the runtime system. |
ager@chromium.org | ab99eea | 2009-08-25 07:05:41 +0000 | [diff] [blame^] | 805 | LoadRoot(ip, Heap::kTheHoleValueRootIndex); |
| 806 | cmp(result, ip); |
ager@chromium.org | eadaf22 | 2009-06-16 09:43:10 +0000 | [diff] [blame] | 807 | b(eq, miss); |
| 808 | |
| 809 | // If the function does not have an initial map, we're done. |
| 810 | Label done; |
| 811 | CompareObjectType(result, scratch, scratch, MAP_TYPE); |
| 812 | b(ne, &done); |
| 813 | |
| 814 | // Get the prototype from the initial map. |
| 815 | ldr(result, FieldMemOperand(result, Map::kPrototypeOffset)); |
| 816 | jmp(&done); |
| 817 | |
| 818 | // Non-instance prototype: Fetch prototype from constructor field |
| 819 | // in initial map. |
| 820 | bind(&non_instance); |
| 821 | ldr(result, FieldMemOperand(result, Map::kConstructorOffset)); |
| 822 | |
| 823 | // All done. |
| 824 | bind(&done); |
| 825 | } |
| 826 | |
| 827 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 828 | void MacroAssembler::CallStub(CodeStub* stub) { |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 829 | ASSERT(allow_stub_calls()); // stub calls are not allowed in some stubs |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 830 | Call(stub->GetCode(), RelocInfo::CODE_TARGET); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 831 | } |
| 832 | |
| 833 | |
| 834 | void MacroAssembler::StubReturn(int argc) { |
| 835 | ASSERT(argc >= 1 && generating_stub()); |
| 836 | if (argc > 1) |
| 837 | add(sp, sp, Operand((argc - 1) * kPointerSize)); |
| 838 | Ret(); |
| 839 | } |
| 840 | |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 841 | |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 842 | void MacroAssembler::IllegalOperation(int num_arguments) { |
| 843 | if (num_arguments > 0) { |
| 844 | add(sp, sp, Operand(num_arguments * kPointerSize)); |
| 845 | } |
ager@chromium.org | ab99eea | 2009-08-25 07:05:41 +0000 | [diff] [blame^] | 846 | LoadRoot(r0, Heap::kUndefinedValueRootIndex); |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 847 | } |
| 848 | |
| 849 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 850 | void MacroAssembler::CallRuntime(Runtime::Function* f, int num_arguments) { |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 851 | // All parameters are on the stack. r0 has the return value after call. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 852 | |
kasperl@chromium.org | 41044eb | 2008-10-06 08:24:46 +0000 | [diff] [blame] | 853 | // If the expected number of arguments of the runtime function is |
| 854 | // constant, we check that the actual number of arguments match the |
| 855 | // expectation. |
| 856 | if (f->nargs >= 0 && f->nargs != num_arguments) { |
| 857 | IllegalOperation(num_arguments); |
| 858 | return; |
| 859 | } |
kasper.lund | 7276f14 | 2008-07-30 08:49:36 +0000 | [diff] [blame] | 860 | |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 861 | Runtime::FunctionId function_id = |
| 862 | static_cast<Runtime::FunctionId>(f->stub_id); |
| 863 | RuntimeStub stub(function_id, num_arguments); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 864 | CallStub(&stub); |
| 865 | } |
| 866 | |
| 867 | |
| 868 | void MacroAssembler::CallRuntime(Runtime::FunctionId fid, int num_arguments) { |
| 869 | CallRuntime(Runtime::FunctionForId(fid), num_arguments); |
| 870 | } |
| 871 | |
| 872 | |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 873 | void MacroAssembler::TailCallRuntime(const ExternalReference& ext, |
| 874 | int num_arguments) { |
| 875 | // TODO(1236192): Most runtime routines don't need the number of |
| 876 | // arguments passed in because it is constant. At some point we |
| 877 | // should remove this need and make the runtime routine entry code |
| 878 | // smarter. |
| 879 | mov(r0, Operand(num_arguments)); |
| 880 | JumpToBuiltin(ext); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 881 | } |
| 882 | |
| 883 | |
| 884 | void MacroAssembler::JumpToBuiltin(const ExternalReference& builtin) { |
| 885 | #if defined(__thumb__) |
| 886 | // Thumb mode builtin. |
| 887 | ASSERT((reinterpret_cast<intptr_t>(builtin.address()) & 1) == 1); |
| 888 | #endif |
| 889 | mov(r1, Operand(builtin)); |
| 890 | CEntryStub stub; |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 891 | Jump(stub.GetCode(), RelocInfo::CODE_TARGET); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 892 | } |
| 893 | |
| 894 | |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 895 | Handle<Code> MacroAssembler::ResolveBuiltin(Builtins::JavaScript id, |
| 896 | bool* resolved) { |
| 897 | // Contract with compiled functions is that the function is passed in r1. |
| 898 | int builtins_offset = |
| 899 | JSBuiltinsObject::kJSBuiltinsOffset + (id * kPointerSize); |
| 900 | ldr(r1, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX))); |
| 901 | ldr(r1, FieldMemOperand(r1, GlobalObject::kBuiltinsOffset)); |
| 902 | ldr(r1, FieldMemOperand(r1, builtins_offset)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 903 | |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 904 | return Builtins::GetCode(id, resolved); |
| 905 | } |
| 906 | |
| 907 | |
| 908 | void MacroAssembler::InvokeBuiltin(Builtins::JavaScript id, |
| 909 | InvokeJSFlags flags) { |
| 910 | bool resolved; |
| 911 | Handle<Code> code = ResolveBuiltin(id, &resolved); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 912 | |
| 913 | if (flags == CALL_JS) { |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 914 | Call(code, RelocInfo::CODE_TARGET); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 915 | } else { |
| 916 | ASSERT(flags == JUMP_JS); |
ager@chromium.org | 236ad96 | 2008-09-25 09:45:57 +0000 | [diff] [blame] | 917 | Jump(code, RelocInfo::CODE_TARGET); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 918 | } |
| 919 | |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 920 | if (!resolved) { |
| 921 | const char* name = Builtins::GetName(id); |
| 922 | int argc = Builtins::GetArgumentsCount(id); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 923 | uint32_t flags = |
| 924 | Bootstrapper::FixupFlagsArgumentsCount::encode(argc) | |
ager@chromium.org | 3bf7b91 | 2008-11-17 09:09:45 +0000 | [diff] [blame] | 925 | Bootstrapper::FixupFlagsIsPCRelative::encode(true) | |
| 926 | Bootstrapper::FixupFlagsUseCodeObject::encode(false); |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 927 | Unresolved entry = { pc_offset() - sizeof(Instr), flags, name }; |
| 928 | unresolved_.Add(entry); |
| 929 | } |
| 930 | } |
| 931 | |
| 932 | |
| 933 | void MacroAssembler::GetBuiltinEntry(Register target, Builtins::JavaScript id) { |
| 934 | bool resolved; |
| 935 | Handle<Code> code = ResolveBuiltin(id, &resolved); |
| 936 | |
| 937 | mov(target, Operand(code)); |
| 938 | if (!resolved) { |
| 939 | const char* name = Builtins::GetName(id); |
| 940 | int argc = Builtins::GetArgumentsCount(id); |
| 941 | uint32_t flags = |
| 942 | Bootstrapper::FixupFlagsArgumentsCount::encode(argc) | |
ager@chromium.org | 3bf7b91 | 2008-11-17 09:09:45 +0000 | [diff] [blame] | 943 | Bootstrapper::FixupFlagsIsPCRelative::encode(true) | |
| 944 | Bootstrapper::FixupFlagsUseCodeObject::encode(true); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 945 | Unresolved entry = { pc_offset() - sizeof(Instr), flags, name }; |
| 946 | unresolved_.Add(entry); |
| 947 | } |
ager@chromium.org | 3bf7b91 | 2008-11-17 09:09:45 +0000 | [diff] [blame] | 948 | |
| 949 | add(target, target, Operand(Code::kHeaderSize - kHeapObjectTag)); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 950 | } |
| 951 | |
| 952 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 953 | void MacroAssembler::SetCounter(StatsCounter* counter, int value, |
| 954 | Register scratch1, Register scratch2) { |
| 955 | if (FLAG_native_code_counters && counter->Enabled()) { |
| 956 | mov(scratch1, Operand(value)); |
| 957 | mov(scratch2, Operand(ExternalReference(counter))); |
| 958 | str(scratch1, MemOperand(scratch2)); |
| 959 | } |
| 960 | } |
| 961 | |
| 962 | |
| 963 | void MacroAssembler::IncrementCounter(StatsCounter* counter, int value, |
| 964 | Register scratch1, Register scratch2) { |
| 965 | ASSERT(value > 0); |
| 966 | if (FLAG_native_code_counters && counter->Enabled()) { |
| 967 | mov(scratch2, Operand(ExternalReference(counter))); |
| 968 | ldr(scratch1, MemOperand(scratch2)); |
| 969 | add(scratch1, scratch1, Operand(value)); |
| 970 | str(scratch1, MemOperand(scratch2)); |
| 971 | } |
| 972 | } |
| 973 | |
| 974 | |
| 975 | void MacroAssembler::DecrementCounter(StatsCounter* counter, int value, |
| 976 | Register scratch1, Register scratch2) { |
| 977 | ASSERT(value > 0); |
| 978 | if (FLAG_native_code_counters && counter->Enabled()) { |
| 979 | mov(scratch2, Operand(ExternalReference(counter))); |
| 980 | ldr(scratch1, MemOperand(scratch2)); |
| 981 | sub(scratch1, scratch1, Operand(value)); |
| 982 | str(scratch1, MemOperand(scratch2)); |
| 983 | } |
| 984 | } |
| 985 | |
| 986 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 987 | void MacroAssembler::Assert(Condition cc, const char* msg) { |
| 988 | if (FLAG_debug_code) |
| 989 | Check(cc, msg); |
| 990 | } |
| 991 | |
| 992 | |
| 993 | void MacroAssembler::Check(Condition cc, const char* msg) { |
| 994 | Label L; |
| 995 | b(cc, &L); |
| 996 | Abort(msg); |
| 997 | // will not return here |
| 998 | bind(&L); |
| 999 | } |
| 1000 | |
| 1001 | |
| 1002 | void MacroAssembler::Abort(const char* msg) { |
| 1003 | // We want to pass the msg string like a smi to avoid GC |
| 1004 | // problems, however msg is not guaranteed to be aligned |
| 1005 | // properly. Instead, we pass an aligned pointer that is |
ager@chromium.org | 3291210 | 2009-01-16 10:38:43 +0000 | [diff] [blame] | 1006 | // a proper v8 smi, but also pass the alignment difference |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1007 | // from the real pointer as a smi. |
| 1008 | intptr_t p1 = reinterpret_cast<intptr_t>(msg); |
| 1009 | intptr_t p0 = (p1 & ~kSmiTagMask) + kSmiTag; |
| 1010 | ASSERT(reinterpret_cast<Object*>(p0)->IsSmi()); |
| 1011 | #ifdef DEBUG |
| 1012 | if (msg != NULL) { |
| 1013 | RecordComment("Abort message: "); |
| 1014 | RecordComment(msg); |
| 1015 | } |
| 1016 | #endif |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1017 | mov(r0, Operand(p0)); |
| 1018 | push(r0); |
| 1019 | mov(r0, Operand(Smi::FromInt(p1 - p0))); |
mads.s.ager | 31e7138 | 2008-08-13 09:32:07 +0000 | [diff] [blame] | 1020 | push(r0); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 1021 | CallRuntime(Runtime::kAbort, 2); |
| 1022 | // will not return here |
| 1023 | } |
| 1024 | |
| 1025 | } } // namespace v8::internal |