Subzero: Start writing out some relocation sections (text)

src/IceFixups.cpp

+//===- subzero/src/IceFixups.cpp - Implementation of Assembler Fixups -----===//
+//
+//                        The Subzero Code Generator
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the AssemblerFixup class, a very basic
+// target-independent representation of a fixup or relocation.
+//
+//===----------------------------------------------------------------------===//
+
+#include "IceFixups.h"
+#include "IceOperand.h"
+
+namespace Ice {
+
+RelocOffsetT AssemblerFixup::offset() const {
+  if (const auto CR = llvm::dyn_cast<ConstantRelocatable>(value_))
+    return CR->getOffset();
+  return 0;
+}
+
+IceString AssemblerFixup::symbol(const GlobalContext *Ctx) const {
+  std::string Buffer;
+  llvm::raw_string_ostream Str(Buffer);
+  const Constant *C = value_;
+  if (const auto CR = llvm::dyn_cast<ConstantRelocatable>(C)) {
+    if (CR->getSuppressMangling())
+      Str << CR->getName();
+    else
+      Str << Ctx->mangleName(CR->getName());
+  } else {
+    // NOTE: currently only float/doubles are put into constant pools.
+    // In the future we may put integers as well.
+    assert(llvm::isa<ConstantFloat>(C) || llvm::isa<ConstantDouble>(C));
+    C->emitPoolLabel(Str);
+  }
+  return Str.str();
+}
+
+void AssemblerFixup::emit(GlobalContext *Ctx) const {
+  Ostream &Str = Ctx->getStrEmit();
+  Str << symbol(Ctx);
+  RelocOffsetT Offset = offset();
+  if (Offset)
+    Str << " + " << Offset;
+}
+
+} // end of namespace Ice