1 // Copyright 2016, VIXL authors 2 // All rights reserved. 3 // 4 // Redistribution and use in source and binary forms, with or without 5 // modification, are permitted provided that the following conditions are met: 6 // 7 // * Redistributions of source code must retain the above copyright notice, 8 // this list of conditions and the following disclaimer. 9 // * Redistributions in binary form must reproduce the above copyright notice, 10 // this list of conditions and the following disclaimer in the documentation 11 // and/or other materials provided with the distribution. 12 // * Neither the name of ARM Limited nor the names of its contributors may be 13 // used to endorse or promote products derived from this software without 14 // specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND 17 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 19 // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE 20 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22 // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 23 // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 27 #ifndef VIXL_ASSEMBLER_BASE_H 28 #define VIXL_ASSEMBLER_BASE_H 29 30 #include "code-buffer-vixl.h" 31 32 // Microsoft Visual C++ defines a `mvn` macro that conflicts with our own 33 // definition. 34 #if defined(_MSC_VER) && defined(mvn) 35 #undef mvn 36 #endif 37 38 namespace vixl { 39 40 class CodeBufferCheckScope; 41 42 namespace internal { 43 44 class AssemblerBase { 45 public: AssemblerBase()46 AssemblerBase() : allow_assembler_(false) {} AssemblerBase(size_t capacity)47 explicit AssemblerBase(size_t capacity) 48 : buffer_(capacity), allow_assembler_(false) {} AssemblerBase(byte * buffer,size_t capacity)49 AssemblerBase(byte* buffer, size_t capacity) 50 : buffer_(buffer, capacity), allow_assembler_(false) {} 51 ~AssemblerBase()52 virtual ~AssemblerBase() {} 53 54 // Finalize a code buffer of generated instructions. This function must be 55 // called before executing or copying code from the buffer. FinalizeCode()56 void FinalizeCode() { GetBuffer()->SetClean(); } 57 GetCursorOffset()58 ptrdiff_t GetCursorOffset() const { return GetBuffer().GetCursorOffset(); } 59 60 // Return the address of the cursor. 61 template <typename T> GetCursorAddress()62 T GetCursorAddress() const { 63 VIXL_STATIC_ASSERT(sizeof(T) >= sizeof(uintptr_t)); 64 return GetBuffer().GetOffsetAddress<T>(GetCursorOffset()); 65 } 66 GetSizeOfCodeGenerated()67 size_t GetSizeOfCodeGenerated() const { return GetCursorOffset(); } 68 69 // Accessors. GetBuffer()70 CodeBuffer* GetBuffer() { return &buffer_; } GetBuffer()71 const CodeBuffer& GetBuffer() const { return buffer_; } AllowAssembler()72 bool AllowAssembler() const { return allow_assembler_; } 73 74 protected: SetAllowAssembler(bool allow)75 void SetAllowAssembler(bool allow) { allow_assembler_ = allow; } 76 77 // CodeBufferCheckScope must be able to temporarily allow the assembler. 78 friend class vixl::CodeBufferCheckScope; 79 80 // Buffer where the code is emitted. 81 CodeBuffer buffer_; 82 83 private: 84 bool allow_assembler_; 85 86 public: 87 // Deprecated public interface. 88 89 // Return the address of an offset in the buffer. 90 template <typename T> 91 VIXL_DEPRECATED("GetBuffer().GetOffsetAddress<T>(offset)", 92 T GetOffsetAddress(ptrdiff_t offset) const) { 93 return GetBuffer().GetOffsetAddress<T>(offset); 94 } 95 96 // Return the address of the start of the buffer. 97 template <typename T> 98 VIXL_DEPRECATED("GetBuffer().GetStartAddress<T>()", 99 T GetStartAddress() const) { 100 return GetBuffer().GetOffsetAddress<T>(0); 101 } 102 }; 103 104 } // namespace internal 105 } // namespace vixl 106 107 #endif // VIXL_ASSEMBLER_BASE_H 108