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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 #ifndef VM_ASSEMBLER_H_ | 5 #ifndef VM_ASSEMBLER_H_ |
6 #define VM_ASSEMBLER_H_ | 6 #define VM_ASSEMBLER_H_ |
7 | 7 |
8 #include "platform/assert.h" | 8 #include "platform/assert.h" |
9 #include "vm/allocation.h" | 9 #include "vm/allocation.h" |
10 #include "vm/globals.h" | 10 #include "vm/globals.h" |
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44 const char* name_; | 44 const char* name_; |
45 const uword address_; | 45 const uword address_; |
46 }; | 46 }; |
47 | 47 |
48 | 48 |
49 // Assembler fixups are positions in generated code that hold relocation | 49 // Assembler fixups are positions in generated code that hold relocation |
50 // information that needs to be processed before finalizing the code | 50 // information that needs to be processed before finalizing the code |
51 // into executable memory. | 51 // into executable memory. |
52 class AssemblerFixup : public ZoneAllocated { | 52 class AssemblerFixup : public ZoneAllocated { |
53 public: | 53 public: |
54 virtual void Process(const MemoryRegion& region, int position) = 0; | 54 virtual void Process(const MemoryRegion& region, intptr_t position) = 0; |
55 | 55 |
56 // It would be ideal if the destructor method could be made private, | 56 // It would be ideal if the destructor method could be made private, |
57 // but the g++ compiler complains when this is subclassed. | 57 // but the g++ compiler complains when this is subclassed. |
58 virtual ~AssemblerFixup() { UNREACHABLE(); } | 58 virtual ~AssemblerFixup() { UNREACHABLE(); } |
59 | 59 |
60 private: | 60 private: |
61 AssemblerFixup* previous_; | 61 AssemblerFixup* previous_; |
62 int position_; | 62 intptr_t position_; |
63 | 63 |
64 AssemblerFixup* previous() const { return previous_; } | 64 AssemblerFixup* previous() const { return previous_; } |
65 void set_previous(AssemblerFixup* previous) { previous_ = previous; } | 65 void set_previous(AssemblerFixup* previous) { previous_ = previous; } |
66 | 66 |
67 int position() const { return position_; } | 67 intptr_t position() const { return position_; } |
68 void set_position(int position) { position_ = position; } | 68 void set_position(intptr_t position) { position_ = position; } |
69 | 69 |
70 friend class AssemblerBuffer; | 70 friend class AssemblerBuffer; |
71 }; | 71 }; |
72 | 72 |
73 | 73 |
74 // Assembler buffers are used to emit binary code. They grow on demand. | 74 // Assembler buffers are used to emit binary code. They grow on demand. |
75 class AssemblerBuffer : public ValueObject { | 75 class AssemblerBuffer : public ValueObject { |
76 public: | 76 public: |
77 AssemblerBuffer(); | 77 AssemblerBuffer(); |
78 ~AssemblerBuffer(); | 78 ~AssemblerBuffer(); |
79 | 79 |
80 // Basic support for emitting, loading, and storing. | 80 // Basic support for emitting, loading, and storing. |
81 template<typename T> void Emit(T value) { | 81 template<typename T> void Emit(T value) { |
82 ASSERT(HasEnsuredCapacity()); | 82 ASSERT(HasEnsuredCapacity()); |
83 *reinterpret_cast<T*>(cursor_) = value; | 83 *reinterpret_cast<T*>(cursor_) = value; |
84 cursor_ += sizeof(T); | 84 cursor_ += sizeof(T); |
85 } | 85 } |
86 | 86 |
87 template<typename T> void Remit() { | 87 template<typename T> void Remit() { |
88 ASSERT(Size() >= static_cast<intptr_t>(sizeof(T))); | 88 ASSERT(Size() >= static_cast<intptr_t>(sizeof(T))); |
89 cursor_ -= sizeof(T); | 89 cursor_ -= sizeof(T); |
90 } | 90 } |
91 | 91 |
92 template<typename T> T Load(int position) { | 92 template<typename T> T Load(intptr_t position) { |
93 ASSERT(position >= 0 && position <= (Size() - static_cast<int>(sizeof(T)))); | 93 ASSERT(position >= 0 && |
| 94 position <= (Size() - static_cast<intptr_t>(sizeof(T)))); |
94 return *reinterpret_cast<T*>(contents_ + position); | 95 return *reinterpret_cast<T*>(contents_ + position); |
95 } | 96 } |
96 | 97 |
97 template<typename T> void Store(int position, T value) { | 98 template<typename T> void Store(intptr_t position, T value) { |
98 ASSERT(position >= 0 && position <= (Size() - static_cast<int>(sizeof(T)))); | 99 ASSERT(position >= 0 && |
| 100 position <= (Size() - static_cast<intptr_t>(sizeof(T)))); |
99 *reinterpret_cast<T*>(contents_ + position) = value; | 101 *reinterpret_cast<T*>(contents_ + position) = value; |
100 } | 102 } |
101 | 103 |
102 const ZoneGrowableArray<int>& pointer_offsets() const { | 104 const ZoneGrowableArray<intptr_t>& pointer_offsets() const { |
103 #if defined(DEBUG) | 105 #if defined(DEBUG) |
104 ASSERT(fixups_processed_); | 106 ASSERT(fixups_processed_); |
105 #endif | 107 #endif |
106 return *pointer_offsets_; | 108 return *pointer_offsets_; |
107 } | 109 } |
108 | 110 |
109 // Emit an object pointer directly in the code. | 111 // Emit an object pointer directly in the code. |
110 void EmitObject(const Object& object); | 112 void EmitObject(const Object& object); |
111 | 113 |
112 // Emit a fixup at the current location. | 114 // Emit a fixup at the current location. |
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167 private: | 169 private: |
168 // The limit is set to kMinimumGap bytes before the end of the data area. | 170 // The limit is set to kMinimumGap bytes before the end of the data area. |
169 // This leaves enough space for the longest possible instruction and allows | 171 // This leaves enough space for the longest possible instruction and allows |
170 // for a single, fast space check per instruction. | 172 // for a single, fast space check per instruction. |
171 static const intptr_t kMinimumGap = 32; | 173 static const intptr_t kMinimumGap = 32; |
172 | 174 |
173 uword contents_; | 175 uword contents_; |
174 uword cursor_; | 176 uword cursor_; |
175 uword limit_; | 177 uword limit_; |
176 AssemblerFixup* fixup_; | 178 AssemblerFixup* fixup_; |
177 ZoneGrowableArray<int>* pointer_offsets_; | 179 ZoneGrowableArray<intptr_t>* pointer_offsets_; |
178 #if defined(DEBUG) | 180 #if defined(DEBUG) |
179 bool fixups_processed_; | 181 bool fixups_processed_; |
180 #endif | 182 #endif |
181 | 183 |
182 uword cursor() const { return cursor_; } | 184 uword cursor() const { return cursor_; } |
183 uword limit() const { return limit_; } | 185 uword limit() const { return limit_; } |
184 intptr_t Capacity() const { | 186 intptr_t Capacity() const { |
185 ASSERT(limit_ >= contents_); | 187 ASSERT(limit_ >= contents_); |
186 return (limit_ - contents_) + kMinimumGap; | 188 return (limit_ - contents_) + kMinimumGap; |
187 } | 189 } |
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209 #include "vm/assembler_x64.h" | 211 #include "vm/assembler_x64.h" |
210 #elif defined(TARGET_ARCH_ARM) | 212 #elif defined(TARGET_ARCH_ARM) |
211 #include "vm/assembler_arm.h" | 213 #include "vm/assembler_arm.h" |
212 #elif defined(TARGET_ARCH_MIPS) | 214 #elif defined(TARGET_ARCH_MIPS) |
213 #include "vm/assembler_mips.h" | 215 #include "vm/assembler_mips.h" |
214 #else | 216 #else |
215 #error Unknown architecture. | 217 #error Unknown architecture. |
216 #endif | 218 #endif |
217 | 219 |
218 #endif // VM_ASSEMBLER_H_ | 220 #endif // VM_ASSEMBLER_H_ |
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