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Issue 68723002: Implement Math.random() purely in JavaScript. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Comments only Created 7 years, 1 month ago
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1 // Copyright 2012 the V8 project authors. All rights reserved. 1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without 2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are 3 // modification, are permitted provided that the following conditions are
4 // met: 4 // met:
5 // 5 //
6 // * Redistributions of source code must retain the above copyright 6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer. 7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above 8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following 9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided 10 // disclaimer in the documentation and/or other materials provided
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3342 VisitForStackValue(args->at(2)); 3342 VisitForStackValue(args->at(2));
3343 __ CallRuntime(Runtime::kLog, 2); 3343 __ CallRuntime(Runtime::kLog, 2);
3344 } 3344 }
3345 3345
3346 // Finally, we're expected to leave a value on the top of the stack. 3346 // Finally, we're expected to leave a value on the top of the stack.
3347 __ LoadRoot(r0, Heap::kUndefinedValueRootIndex); 3347 __ LoadRoot(r0, Heap::kUndefinedValueRootIndex);
3348 context()->Plug(r0); 3348 context()->Plug(r0);
3349 } 3349 }
3350 3350
3351 3351
3352 void FullCodeGenerator::EmitRandomHeapNumber(CallRuntime* expr) {
3353 ASSERT(expr->arguments()->length() == 0);
3354 Label slow_allocate_heapnumber;
3355 Label heapnumber_allocated;
3356
3357 __ LoadRoot(r6, Heap::kHeapNumberMapRootIndex);
3358 __ AllocateHeapNumber(r4, r1, r2, r6, &slow_allocate_heapnumber);
3359 __ jmp(&heapnumber_allocated);
3360
3361 __ bind(&slow_allocate_heapnumber);
3362 // Allocate a heap number.
3363 __ CallRuntime(Runtime::kNumberAlloc, 0);
3364 __ mov(r4, Operand(r0));
3365
3366 __ bind(&heapnumber_allocated);
3367
3368 // Convert 32 random bits in r0 to 0.(32 random bits) in a double
3369 // by computing:
3370 // ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)).
3371 __ PrepareCallCFunction(1, r0);
3372 __ ldr(r0,
3373 ContextOperand(context_register(), Context::GLOBAL_OBJECT_INDEX));
3374 __ ldr(r0, FieldMemOperand(r0, GlobalObject::kNativeContextOffset));
3375 __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 1);
3376
3377 // 0x41300000 is the top half of 1.0 x 2^20 as a double.
3378 // Create this constant using mov/orr to avoid PC relative load.
3379 __ mov(r1, Operand(0x41000000));
3380 __ orr(r1, r1, Operand(0x300000));
3381 // Move 0x41300000xxxxxxxx (x = random bits) to VFP.
3382 __ vmov(d7, r0, r1);
3383 // Move 0x4130000000000000 to VFP.
3384 __ mov(r0, Operand::Zero());
3385 __ vmov(d8, r0, r1);
3386 // Subtract and store the result in the heap number.
3387 __ vsub(d7, d7, d8);
3388 __ sub(r0, r4, Operand(kHeapObjectTag));
3389 __ vstr(d7, r0, HeapNumber::kValueOffset);
3390 __ mov(r0, r4);
3391
3392 context()->Plug(r0);
3393 }
3394
3395
3396 void FullCodeGenerator::EmitSubString(CallRuntime* expr) { 3352 void FullCodeGenerator::EmitSubString(CallRuntime* expr) {
3397 // Load the arguments on the stack and call the stub. 3353 // Load the arguments on the stack and call the stub.
3398 SubStringStub stub; 3354 SubStringStub stub;
3399 ZoneList<Expression*>* args = expr->arguments(); 3355 ZoneList<Expression*>* args = expr->arguments();
3400 ASSERT(args->length() == 3); 3356 ASSERT(args->length() == 3);
3401 VisitForStackValue(args->at(0)); 3357 VisitForStackValue(args->at(0));
3402 VisitForStackValue(args->at(1)); 3358 VisitForStackValue(args->at(1));
3403 VisitForStackValue(args->at(2)); 3359 VisitForStackValue(args->at(2));
3404 __ CallStub(&stub); 3360 __ CallStub(&stub);
3405 context()->Plug(r0); 3361 context()->Plug(r0);
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4978 ASSERT(Memory::uint32_at(interrupt_address_pointer) == 4934 ASSERT(Memory::uint32_at(interrupt_address_pointer) ==
4979 reinterpret_cast<uint32_t>( 4935 reinterpret_cast<uint32_t>(
4980 isolate->builtins()->OsrAfterStackCheck()->entry())); 4936 isolate->builtins()->OsrAfterStackCheck()->entry()));
4981 return OSR_AFTER_STACK_CHECK; 4937 return OSR_AFTER_STACK_CHECK;
4982 } 4938 }
4983 4939
4984 4940
4985 } } // namespace v8::internal 4941 } } // namespace v8::internal
4986 4942
4987 #endif // V8_TARGET_ARCH_ARM 4943 #endif // V8_TARGET_ARCH_ARM
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