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 namespace vixl { 33 34 class CodeBufferCheckScope; 35 36 namespace internal { 37 38 class AssemblerBase { 39 public: 40 AssemblerBase() : allow_assembler_(false) {} 41 explicit AssemblerBase(size_t capacity) 42 : buffer_(capacity), allow_assembler_(false) {} 43 AssemblerBase(byte* buffer, size_t capacity) 44 : buffer_(buffer, capacity), allow_assembler_(false) {} 45 46 virtual ~AssemblerBase() {} 47 48 // Finalize a code buffer of generated instructions. This function must be 49 // called before executing or copying code from the buffer. 50 void FinalizeCode() { GetBuffer()->SetClean(); } 51 52 ptrdiff_t GetCursorOffset() const { return GetBuffer().GetCursorOffset(); } 53 54 // Return the address of the cursor. 55 template <typename T> 56 T GetCursorAddress() const { 57 VIXL_STATIC_ASSERT(sizeof(T) >= sizeof(uintptr_t)); 58 return GetBuffer().GetOffsetAddress<T>(GetCursorOffset()); 59 } 60 61 size_t GetSizeOfCodeGenerated() const { return GetCursorOffset(); } 62 63 // Accessors. 64 CodeBuffer* GetBuffer() { return &buffer_; } 65 const CodeBuffer& GetBuffer() const { return buffer_; } 66 bool AllowAssembler() const { return allow_assembler_; } 67 68 protected: 69 void SetAllowAssembler(bool allow) { allow_assembler_ = allow; } 70 71 // CodeBufferCheckScope must be able to temporarily allow the assembler. 72 friend class vixl::CodeBufferCheckScope; 73 74 // Buffer where the code is emitted. 75 CodeBuffer buffer_; 76 77 private: 78 bool allow_assembler_; 79 80 public: 81 // Deprecated public interface. 82 83 // Return the address of an offset in the buffer. 84 template <typename T> 85 VIXL_DEPRECATED("GetBuffer().GetOffsetAddress<T>(offset)", 86 T GetOffsetAddress(ptrdiff_t offset) const) { 87 return GetBuffer().GetOffsetAddress<T>(offset); 88 } 89 90 // Return the address of the start of the buffer. 91 template <typename T> 92 VIXL_DEPRECATED("GetBuffer().GetStartAddress<T>()", 93 T GetStartAddress() const) { 94 return GetBuffer().GetOffsetAddress<T>(0); 95 } 96 }; 97 98 } // namespace internal 99 } // namespace vixl 100 101 #endif // VIXL_ASSEMBLER_BASE_H 102
