lib/Target/AVR/MCTargetDesc/AVRTargetStreamer.cpp

   1 //===-- AVRTargetStreamer.cpp - AVR Target Streamer Methods ---------------===//
   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 // This file provides AVR specific target streamer methods.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "AVRTargetStreamer.h"
  14
  15 #include "llvm/MC/MCContext.h"
  16
  17 namespace llvm {
  18
  19 AVRTargetStreamer::AVRTargetStreamer(MCStreamer &S) : MCTargetStreamer(S) {}
  20
  21 AVRTargetAsmStreamer::AVRTargetAsmStreamer(MCStreamer &S)
  22     : AVRTargetStreamer(S) {}
  23
  24 void AVRTargetStreamer::finish() {
  25   MCStreamer &OS = getStreamer();
  26   MCContext &Context = OS.getContext();
  27
  28   MCSymbol *DoCopyData = Context.getOrCreateSymbol("__do_copy_data");
  29   MCSymbol *DoClearBss = Context.getOrCreateSymbol("__do_clear_bss");
  30
  31   // FIXME: We can disable __do_copy_data if there are no static RAM variables.
  32
  33   OS.emitRawComment(" Declaring this symbol tells the CRT that it should");
  34   OS.emitRawComment("copy all variables from program memory to RAM on startup");
  35   OS.EmitSymbolAttribute(DoCopyData, MCSA_Global);
  36
  37   OS.emitRawComment(" Declaring this symbol tells the CRT that it should");
  38   OS.emitRawComment("clear the zeroed data section on startup");
  39   OS.EmitSymbolAttribute(DoClearBss, MCSA_Global);
  40 }
  41
  42 } // end namespace llvm
  43