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Issue 82763005: Reland "Implement Math.random() purely in JavaScript" plus fixes. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Added assertion Created 7 years 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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3371 VisitForStackValue(args->at(2)); 3371 VisitForStackValue(args->at(2));
3372 __ CallRuntime(Runtime::kLog, 2); 3372 __ CallRuntime(Runtime::kLog, 2);
3373 } 3373 }
3374 3374
3375 // Finally, we're expected to leave a value on the top of the stack. 3375 // Finally, we're expected to leave a value on the top of the stack.
3376 __ LoadRoot(v0, Heap::kUndefinedValueRootIndex); 3376 __ LoadRoot(v0, Heap::kUndefinedValueRootIndex);
3377 context()->Plug(v0); 3377 context()->Plug(v0);
3378 } 3378 }
3379 3379
3380 3380
3381 void FullCodeGenerator::EmitRandomHeapNumber(CallRuntime* expr) {
3382 ASSERT(expr->arguments()->length() == 0);
3383 Label slow_allocate_heapnumber;
3384 Label heapnumber_allocated;
3385
3386 // Save the new heap number in callee-saved register s0, since
3387 // we call out to external C code below.
3388 __ LoadRoot(t6, Heap::kHeapNumberMapRootIndex);
3389 __ AllocateHeapNumber(s0, a1, a2, t6, &slow_allocate_heapnumber);
3390 __ jmp(&heapnumber_allocated);
3391
3392 __ bind(&slow_allocate_heapnumber);
3393
3394 // Allocate a heap number.
3395 __ CallRuntime(Runtime::kNumberAlloc, 0);
3396 __ mov(s0, v0); // Save result in s0, so it is saved thru CFunc call.
3397
3398 __ bind(&heapnumber_allocated);
3399
3400 // Convert 32 random bits in v0 to 0.(32 random bits) in a double
3401 // by computing:
3402 // ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)).
3403 __ PrepareCallCFunction(1, a0);
3404 __ lw(a0, ContextOperand(cp, Context::GLOBAL_OBJECT_INDEX));
3405 __ lw(a0, FieldMemOperand(a0, GlobalObject::kNativeContextOffset));
3406 __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 1);
3407
3408 // 0x41300000 is the top half of 1.0 x 2^20 as a double.
3409 __ li(a1, Operand(0x41300000));
3410 // Move 0x41300000xxxxxxxx (x = random bits in v0) to FPU.
3411 __ Move(f12, v0, a1);
3412 // Move 0x4130000000000000 to FPU.
3413 __ Move(f14, zero_reg, a1);
3414 // Subtract and store the result in the heap number.
3415 __ sub_d(f0, f12, f14);
3416 __ sdc1(f0, FieldMemOperand(s0, HeapNumber::kValueOffset));
3417 __ mov(v0, s0);
3418
3419 context()->Plug(v0);
3420 }
3421
3422
3423 void FullCodeGenerator::EmitSubString(CallRuntime* expr) { 3381 void FullCodeGenerator::EmitSubString(CallRuntime* expr) {
3424 // Load the arguments on the stack and call the stub. 3382 // Load the arguments on the stack and call the stub.
3425 SubStringStub stub; 3383 SubStringStub stub;
3426 ZoneList<Expression*>* args = expr->arguments(); 3384 ZoneList<Expression*>* args = expr->arguments();
3427 ASSERT(args->length() == 3); 3385 ASSERT(args->length() == 3);
3428 VisitForStackValue(args->at(0)); 3386 VisitForStackValue(args->at(0));
3429 VisitForStackValue(args->at(1)); 3387 VisitForStackValue(args->at(1));
3430 VisitForStackValue(args->at(2)); 3388 VisitForStackValue(args->at(2));
3431 __ CallStub(&stub); 3389 __ CallStub(&stub);
3432 context()->Plug(v0); 3390 context()->Plug(v0);
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5007 Assembler::target_address_at(pc_immediate_load_address)) == 4965 Assembler::target_address_at(pc_immediate_load_address)) ==
5008 reinterpret_cast<uint32_t>( 4966 reinterpret_cast<uint32_t>(
5009 isolate->builtins()->OsrAfterStackCheck()->entry())); 4967 isolate->builtins()->OsrAfterStackCheck()->entry()));
5010 return OSR_AFTER_STACK_CHECK; 4968 return OSR_AFTER_STACK_CHECK;
5011 } 4969 }
5012 4970
5013 4971
5014 } } // namespace v8::internal 4972 } } // namespace v8::internal
5015 4973
5016 #endif // V8_TARGET_ARCH_MIPS 4974 #endif // V8_TARGET_ARCH_MIPS
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