Line data Source code
1 : // Copyright 2018 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_TURBO_ASSEMBLER_H_
6 : #define V8_TURBO_ASSEMBLER_H_
7 :
8 : #include "src/assembler-arch.h"
9 : #include "src/base/template-utils.h"
10 : #include "src/builtins/builtins.h"
11 : #include "src/roots.h"
12 :
13 : namespace v8 {
14 : namespace internal {
15 :
16 : // Common base class for platform-specific TurboAssemblers containing
17 : // platform-independent bits.
18 35149582 : class V8_EXPORT_PRIVATE TurboAssemblerBase : public Assembler {
19 : public:
20 23688 : Isolate* isolate() const {
21 : DCHECK(!options().v8_agnostic_code);
22 23688 : return isolate_;
23 : }
24 :
25 103656 : Handle<HeapObject> CodeObject() const {
26 : DCHECK(!code_object_.is_null());
27 103656 : return code_object_;
28 : }
29 :
30 168 : bool root_array_available() const { return root_array_available_; }
31 6865983 : void set_root_array_available(bool v) { root_array_available_ = v; }
32 :
33 : bool trap_on_abort() const { return trap_on_abort_; }
34 :
35 56 : bool should_abort_hard() const { return hard_abort_; }
36 1103082 : void set_abort_hard(bool v) { hard_abort_ = v; }
37 :
38 2160750 : void set_builtin_index(int i) { maybe_builtin_index_ = i; }
39 :
40 5559158 : void set_has_frame(bool v) { has_frame_ = v; }
41 86576 : bool has_frame() const { return has_frame_; }
42 :
43 : // Calls the given builtin. If builtins are embedded, the trampoline Code
44 : // object on the heap is not used.
45 : virtual void CallBuiltinPointer(Register builtin_pointer) = 0;
46 :
47 : // Calls/jumps to the given Code object. If builtins are embedded, the
48 : // trampoline Code object on the heap is not used.
49 : virtual void CallCodeObject(Register code_object) = 0;
50 : virtual void JumpCodeObject(Register code_object) = 0;
51 :
52 : // Loads the given Code object's entry point into the destination register.
53 : virtual void LoadCodeObjectEntry(Register destination,
54 : Register code_object) = 0;
55 :
56 : // Loads the given constant or external reference without embedding its direct
57 : // pointer. The produced code is isolate-independent.
58 : void IndirectLoadConstant(Register destination, Handle<HeapObject> object);
59 : void IndirectLoadExternalReference(Register destination,
60 : ExternalReference reference);
61 :
62 : virtual void LoadFromConstantsTable(Register destination,
63 : int constant_index) = 0;
64 :
65 : // Corresponds to: destination = kRootRegister + offset.
66 : virtual void LoadRootRegisterOffset(Register destination,
67 : intptr_t offset) = 0;
68 :
69 : // Corresponds to: destination = [kRootRegister + offset].
70 : virtual void LoadRootRelative(Register destination, int32_t offset) = 0;
71 :
72 : virtual void LoadRoot(Register destination, RootIndex index) = 0;
73 :
74 : static int32_t RootRegisterOffsetForRootIndex(RootIndex root_index);
75 : static int32_t RootRegisterOffsetForBuiltinIndex(int builtin_index);
76 :
77 : // Returns the root-relative offset to reference.address().
78 : static intptr_t RootRegisterOffsetForExternalReference(
79 : Isolate* isolate, const ExternalReference& reference);
80 :
81 : // Returns the root-relative offset to the external reference table entry,
82 : // which itself contains reference.address().
83 : static int32_t RootRegisterOffsetForExternalReferenceTableEntry(
84 : Isolate* isolate, const ExternalReference& reference);
85 :
86 : // An address is addressable through kRootRegister if it is located within
87 : // isolate->root_register_addressable_region().
88 : static bool IsAddressableThroughRootRegister(
89 : Isolate* isolate, const ExternalReference& reference);
90 :
91 : protected:
92 : TurboAssemblerBase(const AssemblerOptions& options,
93 : std::unique_ptr<AssemblerBuffer> buffer = {})
94 : : TurboAssemblerBase(nullptr, options.EnableV8AgnosticCode(),
95 : CodeObjectRequired::kNo, std::move(buffer)) {}
96 :
97 294822 : TurboAssemblerBase(Isolate* isolate, CodeObjectRequired create_code_object,
98 : std::unique_ptr<AssemblerBuffer> buffer = {})
99 : : TurboAssemblerBase(isolate, AssemblerOptions::Default(isolate),
100 588139 : create_code_object, std::move(buffer)) {}
101 :
102 : TurboAssemblerBase(Isolate* isolate, const AssemblerOptions& options,
103 : CodeObjectRequired create_code_object,
104 : std::unique_ptr<AssemblerBuffer> buffer = {});
105 :
106 : void RecordCommentForOffHeapTrampoline(int builtin_index);
107 :
108 : Isolate* const isolate_ = nullptr;
109 :
110 : // This handle will be patched with the code object on installation.
111 : Handle<HeapObject> code_object_;
112 :
113 : // Whether kRootRegister has been initialized.
114 : bool root_array_available_ = true;
115 :
116 : // Immediately trap instead of calling {Abort} when debug code fails.
117 : bool trap_on_abort_ = FLAG_trap_on_abort;
118 :
119 : // Emit a C call to abort instead of a runtime call.
120 : bool hard_abort_ = false;
121 :
122 : // May be set while generating builtins.
123 : int maybe_builtin_index_ = Builtins::kNoBuiltinId;
124 :
125 : bool has_frame_ = false;
126 :
127 : DISALLOW_IMPLICIT_CONSTRUCTORS(TurboAssemblerBase);
128 : };
129 :
130 : // Avoids emitting calls to the {Builtins::kAbort} builtin when emitting debug
131 : // code during the lifetime of this scope object. For disabling debug code
132 : // entirely use the {DontEmitDebugCodeScope} instead.
133 : class HardAbortScope {
134 : public:
135 56 : explicit HardAbortScope(TurboAssemblerBase* assembler)
136 56 : : assembler_(assembler), old_value_(assembler->should_abort_hard()) {
137 56 : assembler_->set_abort_hard(true);
138 56 : }
139 56 : ~HardAbortScope() { assembler_->set_abort_hard(old_value_); }
140 :
141 : private:
142 : TurboAssemblerBase* assembler_;
143 : bool old_value_;
144 : };
145 :
146 : #ifdef DEBUG
147 : struct CountIfValidRegisterFunctor {
148 : template <typename RegType>
149 : constexpr int operator()(int count, RegType reg) const {
150 : return count + (reg.is_valid() ? 1 : 0);
151 : }
152 : };
153 :
154 : template <typename RegType, typename... RegTypes,
155 : // All arguments must be either Register or DoubleRegister.
156 : typename = typename std::enable_if<
157 : base::is_same<Register, RegType, RegTypes...>::value ||
158 : base::is_same<DoubleRegister, RegType, RegTypes...>::value>::type>
159 : inline bool AreAliased(RegType first_reg, RegTypes... regs) {
160 : int num_different_regs = NumRegs(RegType::ListOf(first_reg, regs...));
161 : int num_given_regs =
162 : base::fold(CountIfValidRegisterFunctor{}, 0, first_reg, regs...);
163 : return num_different_regs < num_given_regs;
164 : }
165 : #endif
166 :
167 : } // namespace internal
168 : } // namespace v8
169 :
170 : #endif // V8_TURBO_ASSEMBLER_H_
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