lld/wasm/OutputSegment.h

   1 //===- OutputSegment.h ------------------------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef LLD_WASM_OUTPUT_SEGMENT_H
  10 #define LLD_WASM_OUTPUT_SEGMENT_H
  11
  12 #include "InputChunks.h"
  13 #include "lld/Common/ErrorHandler.h"
  14 #include "llvm/Object/Wasm.h"
  15
  16 namespace lld::wasm {
  17
  18 class InputSegment;
  19
  20 class OutputSegment {
  21 public:
  22   OutputSegment(StringRef n) : name(n) {}
  23
  24   void addInputSegment(InputChunk *inSeg);
  25   void finalizeInputSegments();
  26   // In most circumstances BSS segments don't need to be written
  27   // to the output binary.  However if the memory is imported, and
  28   // we can't use memory.fill during startup (due to lack of bulk
  29   // memory feature) then we include BSS segments verbatim.
  30   bool requiredInBinary() const { return !isBss || ctx.emitBssSegments; }
  31
  32   bool isTLS() const { return name == ".tdata"; }
  33
  34   StringRef name;
  35   bool isBss = false;
  36   uint32_t index = 0;
  37   uint32_t linkingFlags = 0;
  38   uint32_t initFlags = 0;
  39   uint32_t sectionOffset = 0;
  40   uint32_t alignment = 0;
  41   uint64_t startVA = 0;
  42   std::vector<InputChunk *> inputSegments;
  43
  44   // Sum of the size of the all the input segments
  45   uint32_t size = 0;
  46
  47   // Segment header
  48   std::string header;
  49 };
  50
  51 } // namespace lld::wasm
  52
  53 #endif // LLD_WASM_OUTPUT_SEGMENT_H