Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1 | // Copyright 2006-2009 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #ifndef V8_ARM_MACRO_ASSEMBLER_ARM_H_ |
| 29 | #define V8_ARM_MACRO_ASSEMBLER_ARM_H_ |
| 30 | |
| 31 | #include "assembler.h" |
| 32 | |
| 33 | namespace v8 { |
| 34 | namespace internal { |
| 35 | |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 36 | // ---------------------------------------------------------------------------- |
| 37 | // Static helper functions |
| 38 | |
| 39 | // Generate a MemOperand for loading a field from an object. |
| 40 | static inline MemOperand FieldMemOperand(Register object, int offset) { |
| 41 | return MemOperand(object, offset - kHeapObjectTag); |
| 42 | } |
| 43 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 44 | |
| 45 | // Give alias names to registers |
| 46 | const Register cp = { 8 }; // JavaScript context pointer |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 47 | const Register roots = { 10 }; // Roots array pointer. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 48 | |
| 49 | enum InvokeJSFlags { |
| 50 | CALL_JS, |
| 51 | JUMP_JS |
| 52 | }; |
| 53 | |
| 54 | |
| 55 | // MacroAssembler implements a collection of frequently used macros. |
| 56 | class MacroAssembler: public Assembler { |
| 57 | public: |
| 58 | MacroAssembler(void* buffer, int size); |
| 59 | |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 60 | // Jump, Call, and Ret pseudo instructions implementing inter-working. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 61 | void Jump(Register target, Condition cond = al); |
| 62 | void Jump(byte* target, RelocInfo::Mode rmode, Condition cond = al); |
| 63 | void Jump(Handle<Code> code, RelocInfo::Mode rmode, Condition cond = al); |
| 64 | void Call(Register target, Condition cond = al); |
| 65 | void Call(byte* target, RelocInfo::Mode rmode, Condition cond = al); |
| 66 | void Call(Handle<Code> code, RelocInfo::Mode rmode, Condition cond = al); |
| 67 | void Ret(Condition cond = al); |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 68 | |
| 69 | // Emit code to discard a non-negative number of pointer-sized elements |
| 70 | // from the stack, clobbering only the sp register. |
| 71 | void Drop(int count, Condition cond = al); |
| 72 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame^] | 73 | |
| 74 | // Swap two registers. If the scratch register is omitted then a slightly |
| 75 | // less efficient form using xor instead of mov is emitted. |
| 76 | void Swap(Register reg1, Register reg2, Register scratch = no_reg); |
| 77 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 78 | void Call(Label* target); |
| 79 | void Move(Register dst, Handle<Object> value); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame^] | 80 | // May do nothing if the registers are identical. |
| 81 | void Move(Register dst, Register src); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 82 | // Jumps to the label at the index given by the Smi in "index". |
| 83 | void SmiJumpTable(Register index, Vector<Label*> targets); |
| 84 | // Load an object from the root table. |
| 85 | void LoadRoot(Register destination, |
| 86 | Heap::RootListIndex index, |
| 87 | Condition cond = al); |
| 88 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame^] | 89 | |
| 90 | // Check if object is in new space. |
| 91 | // scratch can be object itself, but it will be clobbered. |
| 92 | void InNewSpace(Register object, |
| 93 | Register scratch, |
| 94 | Condition cc, // eq for new space, ne otherwise |
| 95 | Label* branch); |
| 96 | |
| 97 | |
| 98 | // Set the remebered set bit for an offset into an |
| 99 | // object. RecordWriteHelper only works if the object is not in new |
| 100 | // space. |
| 101 | void RecordWriteHelper(Register object, Register offset, Register scracth); |
| 102 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 103 | // Sets the remembered set bit for [address+offset], where address is the |
| 104 | // address of the heap object 'object'. The address must be in the first 8K |
| 105 | // of an allocated page. The 'scratch' register is used in the |
| 106 | // implementation and all 3 registers are clobbered by the operation, as |
| 107 | // well as the ip register. |
| 108 | void RecordWrite(Register object, Register offset, Register scratch); |
| 109 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame^] | 110 | // Push two registers. Pushes leftmost register first (to highest address). |
| 111 | void Push(Register src1, Register src2, Condition cond = al) { |
| 112 | ASSERT(!src1.is(src2)); |
| 113 | if (src1.code() > src2.code()) { |
| 114 | stm(db_w, sp, src1.bit() | src2.bit(), cond); |
| 115 | } else { |
| 116 | str(src1, MemOperand(sp, 4, NegPreIndex), cond); |
| 117 | str(src2, MemOperand(sp, 4, NegPreIndex), cond); |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | // Push three registers. Pushes leftmost register first (to highest address). |
| 122 | void Push(Register src1, Register src2, Register src3, Condition cond = al) { |
| 123 | ASSERT(!src1.is(src2)); |
| 124 | ASSERT(!src2.is(src3)); |
| 125 | ASSERT(!src1.is(src3)); |
| 126 | if (src1.code() > src2.code()) { |
| 127 | if (src2.code() > src3.code()) { |
| 128 | stm(db_w, sp, src1.bit() | src2.bit() | src3.bit(), cond); |
| 129 | } else { |
| 130 | stm(db_w, sp, src1.bit() | src2.bit(), cond); |
| 131 | str(src3, MemOperand(sp, 4, NegPreIndex), cond); |
| 132 | } |
| 133 | } else { |
| 134 | str(src1, MemOperand(sp, 4, NegPreIndex), cond); |
| 135 | Push(src2, src3, cond); |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | // Push four registers. Pushes leftmost register first (to highest address). |
| 140 | void Push(Register src1, Register src2, |
| 141 | Register src3, Register src4, Condition cond = al) { |
| 142 | ASSERT(!src1.is(src2)); |
| 143 | ASSERT(!src2.is(src3)); |
| 144 | ASSERT(!src1.is(src3)); |
| 145 | ASSERT(!src1.is(src4)); |
| 146 | ASSERT(!src2.is(src4)); |
| 147 | ASSERT(!src3.is(src4)); |
| 148 | if (src1.code() > src2.code()) { |
| 149 | if (src2.code() > src3.code()) { |
| 150 | if (src3.code() > src4.code()) { |
| 151 | stm(db_w, |
| 152 | sp, |
| 153 | src1.bit() | src2.bit() | src3.bit() | src4.bit(), |
| 154 | cond); |
| 155 | } else { |
| 156 | stm(db_w, sp, src1.bit() | src2.bit() | src3.bit(), cond); |
| 157 | str(src4, MemOperand(sp, 4, NegPreIndex), cond); |
| 158 | } |
| 159 | } else { |
| 160 | stm(db_w, sp, src1.bit() | src2.bit(), cond); |
| 161 | Push(src3, src4, cond); |
| 162 | } |
| 163 | } else { |
| 164 | str(src1, MemOperand(sp, 4, NegPreIndex), cond); |
| 165 | Push(src2, src3, src4, cond); |
| 166 | } |
| 167 | } |
| 168 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 169 | // --------------------------------------------------------------------------- |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 170 | // Stack limit support |
| 171 | |
| 172 | void StackLimitCheck(Label* on_stack_limit_hit); |
| 173 | |
| 174 | // --------------------------------------------------------------------------- |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 175 | // Activation frames |
| 176 | |
| 177 | void EnterInternalFrame() { EnterFrame(StackFrame::INTERNAL); } |
| 178 | void LeaveInternalFrame() { LeaveFrame(StackFrame::INTERNAL); } |
| 179 | |
| 180 | void EnterConstructFrame() { EnterFrame(StackFrame::CONSTRUCT); } |
| 181 | void LeaveConstructFrame() { LeaveFrame(StackFrame::CONSTRUCT); } |
| 182 | |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 183 | // Enter specific kind of exit frame; either normal or debug mode. |
| 184 | // Expects the number of arguments in register r0 and |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 185 | // the builtin function to call in register r1. Exits with argc in |
| 186 | // r4, argv in r6, and and the builtin function to call in r5. |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 187 | void EnterExitFrame(ExitFrame::Mode mode); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 188 | |
| 189 | // Leave the current exit frame. Expects the return value in r0. |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 190 | void LeaveExitFrame(ExitFrame::Mode mode); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 191 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame^] | 192 | // Get the actual activation frame alignment for target environment. |
| 193 | static int ActivationFrameAlignment(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 194 | |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 195 | void LoadContext(Register dst, int context_chain_length); |
| 196 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 197 | // --------------------------------------------------------------------------- |
| 198 | // JavaScript invokes |
| 199 | |
| 200 | // Invoke the JavaScript function code by either calling or jumping. |
| 201 | void InvokeCode(Register code, |
| 202 | const ParameterCount& expected, |
| 203 | const ParameterCount& actual, |
| 204 | InvokeFlag flag); |
| 205 | |
| 206 | void InvokeCode(Handle<Code> code, |
| 207 | const ParameterCount& expected, |
| 208 | const ParameterCount& actual, |
| 209 | RelocInfo::Mode rmode, |
| 210 | InvokeFlag flag); |
| 211 | |
| 212 | // Invoke the JavaScript function in the given register. Changes the |
| 213 | // current context to the context in the function before invoking. |
| 214 | void InvokeFunction(Register function, |
| 215 | const ParameterCount& actual, |
| 216 | InvokeFlag flag); |
| 217 | |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 218 | void InvokeFunction(JSFunction* function, |
| 219 | const ParameterCount& actual, |
| 220 | InvokeFlag flag); |
| 221 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 222 | |
| 223 | #ifdef ENABLE_DEBUGGER_SUPPORT |
| 224 | // --------------------------------------------------------------------------- |
| 225 | // Debugger Support |
| 226 | |
| 227 | void SaveRegistersToMemory(RegList regs); |
| 228 | void RestoreRegistersFromMemory(RegList regs); |
| 229 | void CopyRegistersFromMemoryToStack(Register base, RegList regs); |
| 230 | void CopyRegistersFromStackToMemory(Register base, |
| 231 | Register scratch, |
| 232 | RegList regs); |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 233 | void DebugBreak(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 234 | #endif |
| 235 | |
| 236 | // --------------------------------------------------------------------------- |
| 237 | // Exception handling |
| 238 | |
| 239 | // Push a new try handler and link into try handler chain. |
| 240 | // The return address must be passed in register lr. |
| 241 | // On exit, r0 contains TOS (code slot). |
| 242 | void PushTryHandler(CodeLocation try_location, HandlerType type); |
| 243 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 244 | // Unlink the stack handler on top of the stack from the try handler chain. |
| 245 | // Must preserve the result register. |
| 246 | void PopTryHandler(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 247 | |
| 248 | // --------------------------------------------------------------------------- |
| 249 | // Inline caching support |
| 250 | |
| 251 | // Generates code that verifies that the maps of objects in the |
| 252 | // prototype chain of object hasn't changed since the code was |
| 253 | // generated and branches to the miss label if any map has. If |
| 254 | // necessary the function also generates code for security check |
| 255 | // in case of global object holders. The scratch and holder |
| 256 | // registers are always clobbered, but the object register is only |
| 257 | // clobbered if it the same as the holder register. The function |
| 258 | // returns a register containing the holder - either object_reg or |
| 259 | // holder_reg. |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame^] | 260 | // The function can optionally (when save_at_depth != |
| 261 | // kInvalidProtoDepth) save the object at the given depth by moving |
| 262 | // it to [sp]. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 263 | Register CheckMaps(JSObject* object, Register object_reg, |
| 264 | JSObject* holder, Register holder_reg, |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame^] | 265 | Register scratch, |
| 266 | int save_at_depth, |
| 267 | Label* miss); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 268 | |
| 269 | // Generate code for checking access rights - used for security checks |
| 270 | // on access to global objects across environments. The holder register |
| 271 | // is left untouched, whereas both scratch registers are clobbered. |
| 272 | void CheckAccessGlobalProxy(Register holder_reg, |
| 273 | Register scratch, |
| 274 | Label* miss); |
| 275 | |
| 276 | |
| 277 | // --------------------------------------------------------------------------- |
| 278 | // Allocation support |
| 279 | |
| 280 | // Allocate an object in new space. The object_size is specified in words (not |
| 281 | // bytes). If the new space is exhausted control continues at the gc_required |
| 282 | // label. The allocated object is returned in result. If the flag |
| 283 | // tag_allocated_object is true the result is tagged as as a heap object. |
| 284 | void AllocateInNewSpace(int object_size, |
| 285 | Register result, |
| 286 | Register scratch1, |
| 287 | Register scratch2, |
| 288 | Label* gc_required, |
| 289 | AllocationFlags flags); |
| 290 | void AllocateInNewSpace(Register object_size, |
| 291 | Register result, |
| 292 | Register scratch1, |
| 293 | Register scratch2, |
| 294 | Label* gc_required, |
| 295 | AllocationFlags flags); |
| 296 | |
| 297 | // Undo allocation in new space. The object passed and objects allocated after |
| 298 | // it will no longer be allocated. The caller must make sure that no pointers |
| 299 | // are left to the object(s) no longer allocated as they would be invalid when |
| 300 | // allocation is undone. |
| 301 | void UndoAllocationInNewSpace(Register object, Register scratch); |
| 302 | |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 303 | |
| 304 | void AllocateTwoByteString(Register result, |
| 305 | Register length, |
| 306 | Register scratch1, |
| 307 | Register scratch2, |
| 308 | Register scratch3, |
| 309 | Label* gc_required); |
| 310 | void AllocateAsciiString(Register result, |
| 311 | Register length, |
| 312 | Register scratch1, |
| 313 | Register scratch2, |
| 314 | Register scratch3, |
| 315 | Label* gc_required); |
| 316 | void AllocateTwoByteConsString(Register result, |
| 317 | Register length, |
| 318 | Register scratch1, |
| 319 | Register scratch2, |
| 320 | Label* gc_required); |
| 321 | void AllocateAsciiConsString(Register result, |
| 322 | Register length, |
| 323 | Register scratch1, |
| 324 | Register scratch2, |
| 325 | Label* gc_required); |
| 326 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame^] | 327 | // Allocates a heap number or jumps to the need_gc label if the young space |
| 328 | // is full and a scavenge is needed. |
| 329 | void AllocateHeapNumber(Register result, |
| 330 | Register scratch1, |
| 331 | Register scratch2, |
| 332 | Label* gc_required); |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 333 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 334 | // --------------------------------------------------------------------------- |
| 335 | // Support functions. |
| 336 | |
| 337 | // Try to get function prototype of a function and puts the value in |
| 338 | // the result register. Checks that the function really is a |
| 339 | // function and jumps to the miss label if the fast checks fail. The |
| 340 | // function register will be untouched; the other registers may be |
| 341 | // clobbered. |
| 342 | void TryGetFunctionPrototype(Register function, |
| 343 | Register result, |
| 344 | Register scratch, |
| 345 | Label* miss); |
| 346 | |
| 347 | // Compare object type for heap object. heap_object contains a non-Smi |
| 348 | // whose object type should be compared with the given type. This both |
| 349 | // sets the flags and leaves the object type in the type_reg register. |
| 350 | // It leaves the map in the map register (unless the type_reg and map register |
| 351 | // are the same register). It leaves the heap object in the heap_object |
| 352 | // register unless the heap_object register is the same register as one of the |
| 353 | // other registers. |
| 354 | void CompareObjectType(Register heap_object, |
| 355 | Register map, |
| 356 | Register type_reg, |
| 357 | InstanceType type); |
| 358 | |
| 359 | // Compare instance type in a map. map contains a valid map object whose |
| 360 | // object type should be compared with the given type. This both |
| 361 | // sets the flags and leaves the object type in the type_reg register. It |
| 362 | // leaves the heap object in the heap_object register unless the heap_object |
| 363 | // register is the same register as type_reg. |
| 364 | void CompareInstanceType(Register map, |
| 365 | Register type_reg, |
| 366 | InstanceType type); |
| 367 | |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 368 | |
| 369 | // Check if the map of an object is equal to a specified map and |
| 370 | // branch to label if not. Skip the smi check if not required |
| 371 | // (object is known to be a heap object) |
| 372 | void CheckMap(Register obj, |
| 373 | Register scratch, |
| 374 | Handle<Map> map, |
| 375 | Label* fail, |
| 376 | bool is_heap_object); |
| 377 | |
| 378 | // Load and check the instance type of an object for being a string. |
| 379 | // Loads the type into the second argument register. |
| 380 | // Returns a condition that will be enabled if the object was a string. |
| 381 | Condition IsObjectStringType(Register obj, |
| 382 | Register type) { |
| 383 | ldr(type, FieldMemOperand(obj, HeapObject::kMapOffset)); |
| 384 | ldrb(type, FieldMemOperand(type, Map::kInstanceTypeOffset)); |
| 385 | tst(type, Operand(kIsNotStringMask)); |
| 386 | ASSERT_EQ(0, kStringTag); |
| 387 | return eq; |
| 388 | } |
| 389 | |
| 390 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 391 | inline void BranchOnSmi(Register value, Label* smi_label) { |
| 392 | tst(value, Operand(kSmiTagMask)); |
| 393 | b(eq, smi_label); |
| 394 | } |
| 395 | |
| 396 | inline void BranchOnNotSmi(Register value, Label* not_smi_label) { |
| 397 | tst(value, Operand(kSmiTagMask)); |
| 398 | b(ne, not_smi_label); |
| 399 | } |
| 400 | |
| 401 | // Generates code for reporting that an illegal operation has |
| 402 | // occurred. |
| 403 | void IllegalOperation(int num_arguments); |
| 404 | |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 405 | // Get the number of least significant bits from a register |
| 406 | void GetLeastBitsFromSmi(Register dst, Register src, int num_least_bits); |
| 407 | |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 408 | // Uses VFP instructions to Convert a Smi to a double. |
| 409 | void IntegerToDoubleConversionWithVFP3(Register inReg, |
| 410 | Register outHighReg, |
| 411 | Register outLowReg); |
| 412 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame^] | 413 | // Count leading zeros in a 32 bit word. On ARM5 and later it uses the clz |
| 414 | // instruction. On pre-ARM5 hardware this routine gives the wrong answer |
| 415 | // for 0 (31 instead of 32). |
| 416 | void CountLeadingZeros(Register source, |
| 417 | Register scratch, |
| 418 | Register zeros); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 419 | |
| 420 | // --------------------------------------------------------------------------- |
| 421 | // Runtime calls |
| 422 | |
| 423 | // Call a code stub. |
| 424 | void CallStub(CodeStub* stub, Condition cond = al); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 425 | |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 426 | // Call a code stub. |
| 427 | void TailCallStub(CodeStub* stub, Condition cond = al); |
| 428 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 429 | // Return from a code stub after popping its arguments. |
| 430 | void StubReturn(int argc); |
| 431 | |
| 432 | // Call a runtime routine. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 433 | void CallRuntime(Runtime::Function* f, int num_arguments); |
| 434 | |
| 435 | // Convenience function: Same as above, but takes the fid instead. |
| 436 | void CallRuntime(Runtime::FunctionId fid, int num_arguments); |
| 437 | |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 438 | // Convenience function: call an external reference. |
| 439 | void CallExternalReference(const ExternalReference& ext, |
| 440 | int num_arguments); |
| 441 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 442 | // Tail call of a runtime routine (jump). |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame^] | 443 | // Like JumpToExternalReference, but also takes care of passing the number |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 444 | // of parameters. |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame^] | 445 | void TailCallExternalReference(const ExternalReference& ext, |
| 446 | int num_arguments, |
| 447 | int result_size); |
| 448 | |
| 449 | // Convenience function: tail call a runtime routine (jump). |
| 450 | void TailCallRuntime(Runtime::FunctionId fid, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 451 | int num_arguments, |
| 452 | int result_size); |
| 453 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame^] | 454 | // Before calling a C-function from generated code, align arguments on stack. |
| 455 | // After aligning the frame, non-register arguments must be stored in |
| 456 | // sp[0], sp[4], etc., not pushed. The argument count assumes all arguments |
| 457 | // are word sized. |
| 458 | // Some compilers/platforms require the stack to be aligned when calling |
| 459 | // C++ code. |
| 460 | // Needs a scratch register to do some arithmetic. This register will be |
| 461 | // trashed. |
| 462 | void PrepareCallCFunction(int num_arguments, Register scratch); |
| 463 | |
| 464 | // Calls a C function and cleans up the space for arguments allocated |
| 465 | // by PrepareCallCFunction. The called function is not allowed to trigger a |
| 466 | // garbage collection, since that might move the code and invalidate the |
| 467 | // return address (unless this is somehow accounted for by the called |
| 468 | // function). |
| 469 | void CallCFunction(ExternalReference function, int num_arguments); |
| 470 | void CallCFunction(Register function, int num_arguments); |
| 471 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 472 | // Jump to a runtime routine. |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame^] | 473 | void JumpToExternalReference(const ExternalReference& builtin); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 474 | |
| 475 | // Invoke specified builtin JavaScript function. Adds an entry to |
| 476 | // the unresolved list if the name does not resolve. |
| 477 | void InvokeBuiltin(Builtins::JavaScript id, InvokeJSFlags flags); |
| 478 | |
| 479 | // Store the code object for the given builtin in the target register and |
| 480 | // setup the function in r1. |
| 481 | void GetBuiltinEntry(Register target, Builtins::JavaScript id); |
| 482 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 483 | Handle<Object> CodeObject() { return code_object_; } |
| 484 | |
| 485 | |
| 486 | // --------------------------------------------------------------------------- |
| 487 | // StatsCounter support |
| 488 | |
| 489 | void SetCounter(StatsCounter* counter, int value, |
| 490 | Register scratch1, Register scratch2); |
| 491 | void IncrementCounter(StatsCounter* counter, int value, |
| 492 | Register scratch1, Register scratch2); |
| 493 | void DecrementCounter(StatsCounter* counter, int value, |
| 494 | Register scratch1, Register scratch2); |
| 495 | |
| 496 | |
| 497 | // --------------------------------------------------------------------------- |
| 498 | // Debugging |
| 499 | |
| 500 | // Calls Abort(msg) if the condition cc is not satisfied. |
| 501 | // Use --debug_code to enable. |
| 502 | void Assert(Condition cc, const char* msg); |
| 503 | |
| 504 | // Like Assert(), but always enabled. |
| 505 | void Check(Condition cc, const char* msg); |
| 506 | |
| 507 | // Print a message to stdout and abort execution. |
| 508 | void Abort(const char* msg); |
| 509 | |
| 510 | // Verify restrictions about code generated in stubs. |
| 511 | void set_generating_stub(bool value) { generating_stub_ = value; } |
| 512 | bool generating_stub() { return generating_stub_; } |
| 513 | void set_allow_stub_calls(bool value) { allow_stub_calls_ = value; } |
| 514 | bool allow_stub_calls() { return allow_stub_calls_; } |
| 515 | |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 516 | // --------------------------------------------------------------------------- |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 517 | // Smi utilities |
| 518 | |
| 519 | // Jump if either of the registers contain a non-smi. |
| 520 | void JumpIfNotBothSmi(Register reg1, Register reg2, Label* on_not_both_smi); |
| 521 | // Jump if either of the registers contain a smi. |
| 522 | void JumpIfEitherSmi(Register reg1, Register reg2, Label* on_either_smi); |
| 523 | |
| 524 | // --------------------------------------------------------------------------- |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 525 | // String utilities |
| 526 | |
| 527 | // Checks if both objects are sequential ASCII strings and jumps to label |
| 528 | // if either is not. Assumes that neither object is a smi. |
| 529 | void JumpIfNonSmisNotBothSequentialAsciiStrings(Register object1, |
| 530 | Register object2, |
| 531 | Register scratch1, |
| 532 | Register scratch2, |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame^] | 533 | Label* failure); |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 534 | |
| 535 | // Checks if both objects are sequential ASCII strings and jumps to label |
| 536 | // if either is not. |
| 537 | void JumpIfNotBothSequentialAsciiStrings(Register first, |
| 538 | Register second, |
| 539 | Register scratch1, |
| 540 | Register scratch2, |
| 541 | Label* not_flat_ascii_strings); |
| 542 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame^] | 543 | // Checks if both instance types are sequential ASCII strings and jumps to |
| 544 | // label if either is not. |
| 545 | void JumpIfBothInstanceTypesAreNotSequentialAscii( |
| 546 | Register first_object_instance_type, |
| 547 | Register second_object_instance_type, |
| 548 | Register scratch1, |
| 549 | Register scratch2, |
| 550 | Label* failure); |
| 551 | |
| 552 | // Check if instance type is sequential ASCII string and jump to label if |
| 553 | // it is not. |
| 554 | void JumpIfInstanceTypeIsNotSequentialAscii(Register type, |
| 555 | Register scratch, |
| 556 | Label* failure); |
| 557 | |
| 558 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 559 | private: |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 560 | void Jump(intptr_t target, RelocInfo::Mode rmode, Condition cond = al); |
| 561 | void Call(intptr_t target, RelocInfo::Mode rmode, Condition cond = al); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 562 | |
| 563 | // Helper functions for generating invokes. |
| 564 | void InvokePrologue(const ParameterCount& expected, |
| 565 | const ParameterCount& actual, |
| 566 | Handle<Code> code_constant, |
| 567 | Register code_reg, |
| 568 | Label* done, |
| 569 | InvokeFlag flag); |
| 570 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 571 | // Activation support. |
| 572 | void EnterFrame(StackFrame::Type type); |
| 573 | void LeaveFrame(StackFrame::Type type); |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 574 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame^] | 575 | void InitializeNewString(Register string, |
| 576 | Register length, |
| 577 | Heap::RootListIndex map_index, |
| 578 | Register scratch1, |
| 579 | Register scratch2); |
| 580 | |
Andrei Popescu | 3100271 | 2010-02-23 13:46:05 +0000 | [diff] [blame] | 581 | bool generating_stub_; |
| 582 | bool allow_stub_calls_; |
| 583 | // This handle will be patched with the code object on installation. |
| 584 | Handle<Object> code_object_; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 585 | }; |
| 586 | |
| 587 | |
| 588 | #ifdef ENABLE_DEBUGGER_SUPPORT |
| 589 | // The code patcher is used to patch (typically) small parts of code e.g. for |
| 590 | // debugging and other types of instrumentation. When using the code patcher |
| 591 | // the exact number of bytes specified must be emitted. It is not legal to emit |
| 592 | // relocation information. If any of these constraints are violated it causes |
| 593 | // an assertion to fail. |
| 594 | class CodePatcher { |
| 595 | public: |
| 596 | CodePatcher(byte* address, int instructions); |
| 597 | virtual ~CodePatcher(); |
| 598 | |
| 599 | // Macro assembler to emit code. |
| 600 | MacroAssembler* masm() { return &masm_; } |
| 601 | |
| 602 | // Emit an instruction directly. |
| 603 | void Emit(Instr x); |
| 604 | |
| 605 | // Emit an address directly. |
| 606 | void Emit(Address addr); |
| 607 | |
| 608 | private: |
| 609 | byte* address_; // The address of the code being patched. |
| 610 | int instructions_; // Number of instructions of the expected patch size. |
| 611 | int size_; // Number of bytes of the expected patch size. |
| 612 | MacroAssembler masm_; // Macro assembler used to generate the code. |
| 613 | }; |
| 614 | #endif // ENABLE_DEBUGGER_SUPPORT |
| 615 | |
| 616 | |
| 617 | // ----------------------------------------------------------------------------- |
| 618 | // Static helper functions. |
| 619 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 620 | #ifdef GENERATED_CODE_COVERAGE |
| 621 | #define CODE_COVERAGE_STRINGIFY(x) #x |
| 622 | #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x) |
| 623 | #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__) |
| 624 | #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm-> |
| 625 | #else |
| 626 | #define ACCESS_MASM(masm) masm-> |
| 627 | #endif |
| 628 | |
| 629 | |
| 630 | } } // namespace v8::internal |
| 631 | |
| 632 | #endif // V8_ARM_MACRO_ASSEMBLER_ARM_H_ |