Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4 | |
| 5 | #ifndef V8_ARGUMENTS_H_ |
| 6 | #define V8_ARGUMENTS_H_ |
| 7 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 8 | #include "src/allocation.h" |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 9 | #include "src/objects-inl.h" |
| 10 | #include "src/tracing/trace-event.h" |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 11 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 12 | namespace v8 { |
| 13 | namespace internal { |
| 14 | |
| 15 | // Arguments provides access to runtime call parameters. |
| 16 | // |
| 17 | // It uses the fact that the instance fields of Arguments |
| 18 | // (length_, arguments_) are "overlayed" with the parameters |
| 19 | // (no. of parameters, and the parameter pointer) passed so |
| 20 | // that inside the C++ function, the parameters passed can |
| 21 | // be accessed conveniently: |
| 22 | // |
| 23 | // Object* Runtime_function(Arguments args) { |
| 24 | // ... use args[i] here ... |
| 25 | // } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 26 | // |
| 27 | // Note that length_ (whose value is in the integer range) is defined |
| 28 | // as intptr_t to provide endian-neutrality on 64-bit archs. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 29 | |
| 30 | class Arguments BASE_EMBEDDED { |
| 31 | public: |
| 32 | Arguments(int length, Object** arguments) |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 33 | : length_(length), arguments_(arguments) { |
| 34 | DCHECK_GE(length_, 0); |
| 35 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 36 | |
| 37 | Object*& operator[] (int index) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 38 | DCHECK_GE(index, 0); |
| 39 | DCHECK_LT(static_cast<uint32_t>(index), static_cast<uint32_t>(length_)); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 40 | return *(reinterpret_cast<Object**>(reinterpret_cast<intptr_t>(arguments_) - |
| 41 | index * kPointerSize)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 42 | } |
| 43 | |
| 44 | template <class S> Handle<S> at(int index) { |
| 45 | Object** value = &((*this)[index]); |
| 46 | // This cast checks that the object we're accessing does indeed have the |
| 47 | // expected type. |
| 48 | S::cast(*value); |
| 49 | return Handle<S>(reinterpret_cast<S**>(value)); |
| 50 | } |
| 51 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 52 | int smi_at(int index) { |
| 53 | return Smi::cast((*this)[index])->value(); |
| 54 | } |
| 55 | |
| 56 | double number_at(int index) { |
| 57 | return (*this)[index]->Number(); |
| 58 | } |
| 59 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 60 | // Get the total number of arguments including the receiver. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 61 | int length() const { return static_cast<int>(length_); } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 62 | |
| 63 | Object** arguments() { return arguments_; } |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 64 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 65 | Object** lowest_address() { return &this->operator[](length() - 1); } |
| 66 | |
| 67 | Object** highest_address() { return &this->operator[](0); } |
| 68 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 69 | private: |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 70 | intptr_t length_; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 71 | Object** arguments_; |
| 72 | }; |
| 73 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 74 | double ClobberDoubleRegisters(double x1, double x2, double x3, double x4); |
| 75 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 76 | #ifdef DEBUG |
| 77 | #define CLOBBER_DOUBLE_REGISTERS() ClobberDoubleRegisters(1, 2, 3, 4); |
| 78 | #else |
| 79 | #define CLOBBER_DOUBLE_REGISTERS() |
| 80 | #endif |
| 81 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 82 | // TODO(cbruni): add global flag to check whether any tracing events have been |
| 83 | // enabled. |
| 84 | #define RUNTIME_FUNCTION_RETURNS_TYPE(Type, Name) \ |
| 85 | static INLINE(Type __RT_impl_##Name(Arguments args, Isolate* isolate)); \ |
| 86 | \ |
| 87 | V8_NOINLINE static Type Stats_##Name(int args_length, Object** args_object, \ |
| 88 | Isolate* isolate) { \ |
| 89 | RuntimeCallTimerScope timer(isolate, &RuntimeCallStats::Name); \ |
| 90 | TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.runtime"), \ |
| 91 | "V8.Runtime_" #Name); \ |
| 92 | Arguments args(args_length, args_object); \ |
| 93 | return __RT_impl_##Name(args, isolate); \ |
| 94 | } \ |
| 95 | \ |
| 96 | Type Name(int args_length, Object** args_object, Isolate* isolate) { \ |
| 97 | CLOBBER_DOUBLE_REGISTERS(); \ |
| 98 | if (FLAG_runtime_call_stats) { \ |
| 99 | return Stats_##Name(args_length, args_object, isolate); \ |
| 100 | } \ |
| 101 | Arguments args(args_length, args_object); \ |
| 102 | return __RT_impl_##Name(args, isolate); \ |
| 103 | } \ |
| 104 | \ |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 105 | static Type __RT_impl_##Name(Arguments args, Isolate* isolate) |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 106 | |
| 107 | #define RUNTIME_FUNCTION(Name) RUNTIME_FUNCTION_RETURNS_TYPE(Object*, Name) |
| 108 | #define RUNTIME_FUNCTION_RETURN_PAIR(Name) \ |
| 109 | RUNTIME_FUNCTION_RETURNS_TYPE(ObjectPair, Name) |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 110 | #define RUNTIME_FUNCTION_RETURN_TRIPLE(Name) \ |
| 111 | RUNTIME_FUNCTION_RETURNS_TYPE(ObjectTriple, Name) |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 112 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 113 | } // namespace internal |
| 114 | } // namespace v8 |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 115 | |
| 116 | #endif // V8_ARGUMENTS_H_ |