Imported Upstream version 5.18.0.205

Former-commit-id: 7f59f7e792705db773f1caecdaa823092f4e2927

external/llvm/lib/Target/ARM/MCTargetDesc/ARMUnwindOpAsm.h

@@ -0,0 +1,92 @@
+//===-- ARMUnwindOpAsm.h - ARM Unwind Opcodes Assembler ---------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the unwind opcode assmebler for ARM exception handling
+// table.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMUNWINDOPASM_H
+#define LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMUNWINDOPASM_H
+
+#include "llvm/ADT/SmallVector.h"
+#include <cstddef>
+#include <cstdint>
+
+namespace llvm {
+
+class MCSymbol;
+
+class UnwindOpcodeAssembler {
+private:
+  SmallVector<uint8_t, 32> Ops;
+  SmallVector<unsigned, 8> OpBegins;
+  bool HasPersonality = false;
+
+public:
+  UnwindOpcodeAssembler() {
+    OpBegins.push_back(0);
+  }
+
+  /// Reset the unwind opcode assembler.
+  void Reset() {
+    Ops.clear();
+    OpBegins.clear();
+    OpBegins.push_back(0);
+    HasPersonality = false;
+  }
+
+  /// Set the personality
+  void setPersonality(const MCSymbol *Per) {
+    HasPersonality = true;
+  }
+
+  /// Emit unwind opcodes for .save directives
+  void EmitRegSave(uint32_t RegSave);
+
+  /// Emit unwind opcodes for .vsave directives
+  void EmitVFPRegSave(uint32_t VFPRegSave);
+
+  /// Emit unwind opcodes to copy address from source register to $sp.
+  void EmitSetSP(uint16_t Reg);
+
+  /// Emit unwind opcodes to add $sp with an offset.
+  void EmitSPOffset(int64_t Offset);
+
+  /// Emit unwind raw opcodes
+  void EmitRaw(const SmallVectorImpl<uint8_t> &Opcodes) {
+    Ops.insert(Ops.end(), Opcodes.begin(), Opcodes.end());
+    OpBegins.push_back(OpBegins.back() + Opcodes.size());
+  }
+
+  /// Finalize the unwind opcode sequence for EmitBytes()
+  void Finalize(unsigned &PersonalityIndex,
+                SmallVectorImpl<uint8_t> &Result);
+
+private:
+  void EmitInt8(unsigned Opcode) {
+    Ops.push_back(Opcode & 0xff);
+    OpBegins.push_back(OpBegins.back() + 1);
+  }
+
+  void EmitInt16(unsigned Opcode) {
+    Ops.push_back((Opcode >> 8) & 0xff);
+    Ops.push_back(Opcode & 0xff);
+    OpBegins.push_back(OpBegins.back() + 2);
+  }
+
+  void EmitBytes(const uint8_t *Opcode, size_t Size) {
+    Ops.insert(Ops.end(), Opcode, Opcode + Size);
+    OpBegins.push_back(OpBegins.back() + Size);
+  }
+};
+
+} // end namespace llvm
+
+#endif // LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMUNWINDOPASM_H