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: AssemblerBase()40 AssemblerBase() : allow_assembler_(true) {} 41 #ifdef PANDA_BUILD 42 AssemblerBase(size_t capacity) = delete; 43 #else AssemblerBase(size_t capacity)44 explicit AssemblerBase(size_t capacity) 45 : buffer_(capacity), allow_assembler_(false) {} 46 #endif AssemblerBase(byte * buffer,size_t capacity)47 AssemblerBase(byte* buffer, size_t capacity) 48 : buffer_(buffer, capacity), allow_assembler_(true) {} 49 ~AssemblerBase()50 virtual ~AssemblerBase() {} 51 IsValid()52 bool IsValid() const { 53 return buffer_.IsValid(); 54 } 55 56 // Finalize a code buffer of generated instructions. This function must be 57 // called before executing or copying code from the buffer. FinalizeCode()58 void FinalizeCode() { GetBuffer()->SetClean(); } 59 GetCursorOffset()60 ptrdiff_t GetCursorOffset() const { return GetBuffer().GetCursorOffset(); } 61 62 // Return the address of the cursor. 63 template <typename T> GetCursorAddress()64 T GetCursorAddress() const { 65 VIXL_STATIC_ASSERT(sizeof(T) >= sizeof(uintptr_t)); 66 return GetBuffer().GetOffsetAddress<T>(GetCursorOffset()); 67 } 68 GetSizeOfCodeGenerated()69 size_t GetSizeOfCodeGenerated() const { return GetCursorOffset(); } 70 71 // Accessors. GetBuffer()72 CodeBuffer* GetBuffer() { return &buffer_; } GetBuffer()73 const CodeBuffer& GetBuffer() const { return buffer_; } AllowAssembler()74 bool AllowAssembler() const { return allow_assembler_; } 75 76 protected: SetAllowAssembler(bool allow)77 void SetAllowAssembler(bool allow) { allow_assembler_ = allow; } 78 79 // CodeBufferCheckScope must be able to temporarily allow the assembler. 80 friend class vixl::CodeBufferCheckScope; 81 82 // Buffer where the code is emitted. 83 CodeBuffer buffer_; 84 85 private: 86 bool allow_assembler_; 87 88 public: 89 // Deprecated public interface. 90 91 // Return the address of an offset in the buffer. 92 template <typename T> 93 VIXL_DEPRECATED("GetBuffer().GetOffsetAddress<T>(offset)", 94 T GetOffsetAddress(ptrdiff_t offset) const) { 95 return GetBuffer().GetOffsetAddress<T>(offset); 96 } 97 98 // Return the address of the start of the buffer. 99 template <typename T> 100 VIXL_DEPRECATED("GetBuffer().GetStartAddress<T>()", 101 T GetStartAddress() const) { 102 return GetBuffer().GetOffsetAddress<T>(0); 103 } 104 }; 105 106 } // namespace internal 107 } // namespace vixl 108 109 #endif // VIXL_ASSEMBLER_BASE_H 110