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1 // Copyright (c) 1994-2006 Sun Microsystems Inc. | 1 // Copyright (c) 1994-2006 Sun Microsystems Inc. |
2 // All Rights Reserved. | 2 // All Rights Reserved. |
3 // | 3 // |
4 // Redistribution and use in source and binary forms, with or without | 4 // Redistribution and use in source and binary forms, with or without |
5 // modification, are permitted provided that the following conditions are | 5 // modification, are permitted provided that the following conditions are |
6 // met: | 6 // met: |
7 // | 7 // |
8 // - Redistributions of source code must retain the above copyright notice, | 8 // - Redistributions of source code must retain the above copyright notice, |
9 // this list of conditions and the following disclaimer. | 9 // this list of conditions and the following disclaimer. |
10 // | 10 // |
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57 // | 57 // |
58 // 3) By not using an enum, we are possibly preventing the compiler from | 58 // 3) By not using an enum, we are possibly preventing the compiler from |
59 // doing certain constant folds, which may significantly reduce the | 59 // doing certain constant folds, which may significantly reduce the |
60 // code generated for some assembly instructions (because they boil down | 60 // code generated for some assembly instructions (because they boil down |
61 // to a few constants). If this is a problem, we could change the code | 61 // to a few constants). If this is a problem, we could change the code |
62 // such that we use an enum in optimized mode, and the struct in debug | 62 // such that we use an enum in optimized mode, and the struct in debug |
63 // mode. This way we get the compile-time error checking in debug mode | 63 // mode. This way we get the compile-time error checking in debug mode |
64 // and best performance in optimized code. | 64 // and best performance in optimized code. |
65 // | 65 // |
66 struct Register { | 66 struct Register { |
67 bool is_valid() const { return 0 <= code_ && code_ < 8; } | 67 bool is_valid() const { return 0 <= code_ && code_ < 8; } |
68 bool is(Register reg) const { return code_ == reg.code_; } | 68 bool is(Register reg) const { return code_ == reg.code_; } |
69 // eax, ebx, ecx and edx are byte registers, the rest are not. | 69 // eax, ebx, ecx and edx are byte registers, the rest are not. |
70 bool is_byte_register() const { return code_ <= 3; } | 70 bool is_byte_register() const { return code_ <= 3; } |
71 int code() const { | 71 int code() const { |
72 ASSERT(is_valid()); | 72 ASSERT(is_valid()); |
73 return code_; | 73 return code_; |
74 } | 74 } |
75 int bit() const { | 75 int bit() const { |
76 ASSERT(is_valid()); | 76 ASSERT(is_valid()); |
77 return 1 << code_; | 77 return 1 << code_; |
78 } | 78 } |
79 | 79 |
80 // Unfortunately we can't make this private in a struct. | 80 // Unfortunately we can't make this private in a struct. |
81 int code_; | 81 int code_; |
82 }; | 82 }; |
83 | 83 |
84 const Register eax = { 0 }; | 84 const Register eax = { 0 }; |
85 const Register ecx = { 1 }; | 85 const Register ecx = { 1 }; |
86 const Register edx = { 2 }; | 86 const Register edx = { 2 }; |
87 const Register ebx = { 3 }; | 87 const Register ebx = { 3 }; |
88 const Register esp = { 4 }; | 88 const Register esp = { 4 }; |
89 const Register ebp = { 5 }; | 89 const Register ebp = { 5 }; |
90 const Register esi = { 6 }; | 90 const Register esi = { 6 }; |
91 const Register edi = { 7 }; | 91 const Register edi = { 7 }; |
92 const Register no_reg = { -1 }; | 92 const Register no_reg = { -1 }; |
93 | 93 |
94 | 94 |
95 struct XMMRegister { | 95 struct XMMRegister { |
96 bool is_valid() const { return 0 <= code_ && code_ < 8; } | 96 bool is_valid() const { return 0 <= code_ && code_ < 8; } |
97 int code() const { | 97 int code() const { |
98 ASSERT(is_valid()); | 98 ASSERT(is_valid()); |
99 return code_; | 99 return code_; |
100 } | 100 } |
101 | 101 |
102 int code_; | 102 int code_; |
103 }; | 103 }; |
104 | 104 |
105 const XMMRegister xmm0 = { 0 }; | 105 const XMMRegister xmm0 = { 0 }; |
106 const XMMRegister xmm1 = { 1 }; | 106 const XMMRegister xmm1 = { 1 }; |
107 const XMMRegister xmm2 = { 2 }; | 107 const XMMRegister xmm2 = { 2 }; |
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848 void RecordComment(const char* msg); | 848 void RecordComment(const char* msg); |
849 | 849 |
850 void RecordPosition(int pos); | 850 void RecordPosition(int pos); |
851 void RecordStatementPosition(int pos); | 851 void RecordStatementPosition(int pos); |
852 bool WriteRecordedPositions(); | 852 bool WriteRecordedPositions(); |
853 | 853 |
854 // Writes a single word of data in the code stream. | 854 // Writes a single word of data in the code stream. |
855 // Used for inline tables, e.g., jump-tables. | 855 // Used for inline tables, e.g., jump-tables. |
856 void dd(uint32_t data, RelocInfo::Mode reloc_info); | 856 void dd(uint32_t data, RelocInfo::Mode reloc_info); |
857 | 857 |
858 int pc_offset() const { return pc_ - buffer_; } | 858 int pc_offset() const { return pc_ - buffer_; } |
859 int current_statement_position() const { return current_statement_position_; } | 859 int current_statement_position() const { return current_statement_position_; } |
860 int current_position() const { return current_position_; } | 860 int current_position() const { return current_position_; } |
861 | 861 |
862 // Check if there is less than kGap bytes available in the buffer. | 862 // Check if there is less than kGap bytes available in the buffer. |
863 // If this is the case, we need to grow the buffer before emitting | 863 // If this is the case, we need to grow the buffer before emitting |
864 // an instruction or relocation information. | 864 // an instruction or relocation information. |
865 inline bool overflow() const { return pc_ >= reloc_info_writer.pos() - kGap; } | 865 inline bool overflow() const { return pc_ >= reloc_info_writer.pos() - kGap; } |
866 | 866 |
867 // Get the number of bytes available in the buffer. | 867 // Get the number of bytes available in the buffer. |
868 inline int available_space() const { return reloc_info_writer.pos() - pc_; } | 868 inline int available_space() const { return reloc_info_writer.pos() - pc_; } |
869 | 869 |
870 static bool IsNop(Address addr) { return *addr == 0x90; } | 870 static bool IsNop(Address addr) { return *addr == 0x90; } |
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978 private: | 978 private: |
979 Assembler* assembler_; | 979 Assembler* assembler_; |
980 #ifdef DEBUG | 980 #ifdef DEBUG |
981 int space_before_; | 981 int space_before_; |
982 #endif | 982 #endif |
983 }; | 983 }; |
984 | 984 |
985 } } // namespace v8::internal | 985 } } // namespace v8::internal |
986 | 986 |
987 #endif // V8_IA32_ASSEMBLER_IA32_H_ | 987 #endif // V8_IA32_ASSEMBLER_IA32_H_ |
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