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_MACRO_ASSEMBLER_INTERFACE_H 28 #define VIXL_MACRO_ASSEMBLER_INTERFACE_H 29 30 #include "assembler-base-vixl.h" 31 32 namespace vixl { 33 34 class MacroAssemblerInterface { 35 public: 36 virtual internal::AssemblerBase* AsAssemblerBase() = 0; 37 ~MacroAssemblerInterface()38 virtual ~MacroAssemblerInterface() {} 39 40 virtual bool AllowMacroInstructions() const = 0; 41 virtual bool ArePoolsBlocked() const = 0; 42 43 protected: 44 virtual void SetAllowMacroInstructions(bool allow) = 0; 45 46 virtual void BlockPools() = 0; 47 virtual void ReleasePools() = 0; 48 virtual void EnsureEmitPoolsFor(size_t size) = 0; 49 50 // Emit the branch over a literal/veneer pool, and any necessary padding 51 // before it. 52 virtual void EmitPoolHeader() = 0; 53 // When this is called, the label used for branching over the pool is bound. 54 // This can also generate additional padding, which must correspond to the 55 // alignment_ value passed to the PoolManager (which needs to keep track of 56 // the exact size of the generated pool). 57 virtual void EmitPoolFooter() = 0; 58 59 // Emit n bytes of padding that does not have to be executable. 60 virtual void EmitPaddingBytes(int n) = 0; 61 // Emit n bytes of padding that has to be executable. Implementations must 62 // make sure this is a multiple of the instruction size. 63 virtual void EmitNopBytes(int n) = 0; 64 65 // The following scopes need access to the above method in order to implement 66 // pool blocking and temporarily disable the macro-assembler. 67 friend class ExactAssemblyScope; 68 friend class EmissionCheckScope; 69 template <typename T> 70 friend class PoolManager; 71 }; 72 73 } // namespace vixl 74 75 #endif // VIXL_MACRO_ASSEMBLER_INTERFACE_H 76