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 {
  17 namespace wasm {
  18
  19 class InputSegment;
  20
  21 class OutputSegment {
  22 public:
  23   OutputSegment(StringRef n) : name(n) {}
  24
  25   void addInputSegment(InputChunk *inSeg);
  26   void finalizeInputSegments();
  27   // In most circumstances BSS segments don't need to be written
  28   // to the output binary.  However if the memory is imported, and
  29   // we can't use memory.fill during startup (due to lack of bulk
  30   // memory feature) then we include BSS segments verbatim.
  31   bool requiredInBinary() const { return !isBss || config->emitBssSegments; }
  32
  33   bool isTLS() const { return name == ".tdata"; }
  34
  35   StringRef name;
  36   bool isBss = false;
  37   uint32_t index = 0;
  38   uint32_t linkingFlags = 0;
  39   uint32_t initFlags = 0;
  40   uint32_t sectionOffset = 0;
  41   uint32_t alignment = 0;
  42   uint64_t startVA = 0;
  43   std::vector<InputChunk *> inputSegments;
  44
  45   // Sum of the size of the all the input segments
  46   uint32_t size = 0;
  47
  48   // Segment header
  49   std::string header;
  50 };
  51
  52 } // namespace wasm
  53 } // namespace lld
  54
  55 #endif // LLD_WASM_OUTPUT_SEGMENT_H