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1 : // Copyright 2009 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.
4 :
5 : #ifndef V8_SIMULATOR_H_
6 : #define V8_SIMULATOR_H_
7 :
8 : #include "src/globals.h"
9 : #include "src/objects/code.h"
10 :
11 : #if !defined(USE_SIMULATOR)
12 : #include "src/utils.h"
13 : #endif
14 :
15 : #if V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X64
16 : // No simulator for ia32 or x64.
17 : #elif V8_TARGET_ARCH_ARM64
18 : #include "src/arm64/simulator-arm64.h"
19 : #elif V8_TARGET_ARCH_ARM
20 : #include "src/arm/simulator-arm.h"
21 : #elif V8_TARGET_ARCH_PPC
22 : #include "src/ppc/simulator-ppc.h"
23 : #elif V8_TARGET_ARCH_MIPS
24 : #include "src/mips/simulator-mips.h"
25 : #elif V8_TARGET_ARCH_MIPS64
26 : #include "src/mips64/simulator-mips64.h"
27 : #elif V8_TARGET_ARCH_S390
28 : #include "src/s390/simulator-s390.h"
29 : #else
30 : #error Unsupported target architecture.
31 : #endif
32 :
33 : namespace v8 {
34 : namespace internal {
35 :
36 : #if defined(USE_SIMULATOR)
37 : // Running with a simulator.
38 :
39 : // The simulator has its own stack. Thus it has a different stack limit from
40 : // the C-based native code. The JS-based limit normally points near the end of
41 : // the simulator stack. When the C-based limit is exhausted we reflect that by
42 : // lowering the JS-based limit as well, to make stack checks trigger.
43 : class SimulatorStack : public v8::internal::AllStatic {
44 : public:
45 : static inline uintptr_t JsLimitFromCLimit(v8::internal::Isolate* isolate,
46 : uintptr_t c_limit) {
47 : return Simulator::current(isolate)->StackLimit(c_limit);
48 : }
49 :
50 : // Returns the current stack address on the simulator stack frame.
51 : // The returned address is comparable with JS stack address.
52 : static inline uintptr_t RegisterJSStackComparableAddress(
53 : v8::internal::Isolate* isolate) {
54 : // The value of |kPlaceHolder| is actually not used. It just occupies a
55 : // single word on the stack frame of the simulator.
56 : const uintptr_t kPlaceHolder = 0x4A535350u; // "JSSP" in ASCII
57 : return Simulator::current(isolate)->PushAddress(kPlaceHolder);
58 : }
59 :
60 : static inline void UnregisterJSStackComparableAddress(
61 : v8::internal::Isolate* isolate) {
62 : Simulator::current(isolate)->PopAddress();
63 : }
64 : };
65 :
66 : #else // defined(USE_SIMULATOR)
67 : // Running without a simulator on a native platform.
68 :
69 : // The stack limit beyond which we will throw stack overflow errors in
70 : // generated code. Because generated code uses the C stack, we just use
71 : // the C stack limit.
72 : class SimulatorStack : public v8::internal::AllStatic {
73 : public:
74 : static inline uintptr_t JsLimitFromCLimit(v8::internal::Isolate* isolate,
75 : uintptr_t c_limit) {
76 : USE(isolate);
77 : return c_limit;
78 : }
79 :
80 : // Returns the current stack address on the native stack frame.
81 : // The returned address is comparable with JS stack address.
82 : static inline uintptr_t RegisterJSStackComparableAddress(
83 : v8::internal::Isolate* isolate) {
84 : USE(isolate);
85 20928036 : return internal::GetCurrentStackPosition();
86 : }
87 :
88 : static inline void UnregisterJSStackComparableAddress(
89 : v8::internal::Isolate* isolate) {
90 : USE(isolate);
91 : }
92 : };
93 :
94 : #endif // defined(USE_SIMULATOR)
95 :
96 : // Use this class either as {GeneratedCode<ret, arg1, arg2>} or
97 : // {GeneratedCode<ret(arg1, arg2)>} (see specialization below).
98 : template <typename Return, typename... Args>
99 : class GeneratedCode {
100 : public:
101 : using Signature = Return(Args...);
102 :
103 : static GeneratedCode FromAddress(Isolate* isolate, Address addr) {
104 82506562 : return GeneratedCode(isolate, reinterpret_cast<Signature*>(addr));
105 : }
106 :
107 : static GeneratedCode FromBuffer(Isolate* isolate, byte* buffer) {
108 185 : return GeneratedCode(isolate, reinterpret_cast<Signature*>(buffer));
109 : }
110 :
111 : static GeneratedCode FromCode(Code code) {
112 : return FromAddress(code->GetIsolate(), code->entry());
113 : }
114 :
115 : #ifdef USE_SIMULATOR
116 : // Defined in simulator-base.h.
117 : Return Call(Args... args) {
118 : return Simulator::current(isolate_)->template Call<Return>(
119 : reinterpret_cast<Address>(fn_ptr_), args...);
120 : }
121 : #else
122 : DISABLE_CFI_ICALL Return Call(Args... args) {
123 : // When running without a simulator we call the entry directly.
124 : #if V8_OS_AIX
125 : // AIX ABI requires function descriptors (FD). Artificially create a pseudo
126 : // FD to ensure correct dispatch to generated code. The 'volatile'
127 : // declaration is required to avoid the compiler from not observing the
128 : // alias of the pseudo FD to the function pointer, and hence, optimizing the
129 : // pseudo FD declaration/initialization away.
130 : volatile Address function_desc[] = {reinterpret_cast<Address>(fn_ptr_), 0,
131 : 0};
132 : Signature* fn = reinterpret_cast<Signature*>(function_desc);
133 : return fn(args...);
134 : #else
135 82510925 : return fn_ptr_(args...);
136 : #endif // V8_OS_AIX
137 : }
138 : #endif
139 :
140 : private:
141 : friend class GeneratedCode<Return(Args...)>;
142 : Isolate* isolate_;
143 : Signature* fn_ptr_;
144 : GeneratedCode(Isolate* isolate, Signature* fn_ptr)
145 : : isolate_(isolate), fn_ptr_(fn_ptr) {}
146 : };
147 :
148 : // Allow to use {GeneratedCode<ret(arg1, arg2)>} instead of
149 : // {GeneratedCode<ret, arg1, arg2>}.
150 : template <typename Return, typename... Args>
151 : class GeneratedCode<Return(Args...)> : public GeneratedCode<Return, Args...> {
152 : public:
153 : // Automatically convert from {GeneratedCode<ret, arg1, arg2>} to
154 : // {GeneratedCode<ret(arg1, arg2)>}.
155 : GeneratedCode(GeneratedCode<Return, Args...> other)
156 : : GeneratedCode<Return, Args...>(other.isolate_, other.fn_ptr_) {}
157 : };
158 :
159 : } // namespace internal
160 178779 : } // namespace v8
161 :
162 : #endif // V8_SIMULATOR_H_
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