Move lowerGlobal() from target-specific code to emitGlobal() in generic code.

src/IceTargetLowering.cpp

 //===- subzero/src/IceTargetLowering.cpp - Basic lowering implementation --===//
 //
 //                        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 skeleton of the TargetLowering class,
 // specifically invoking the appropriate lowering method for a given
 // instruction kind and driving global register allocation.  It also
 // implements the non-deleted instruction iteration in
 // LoweringContext.
 //
 //===----------------------------------------------------------------------===//
 
 #include "IceAssemblerARM32.h"
 #include "IceAssemblerX8632.h"
 #include "assembler_mips32.h"
 #include "IceCfg.h" // setError()
 #include "IceCfgNode.h"
+#include "IceGlobalInits.h"
 #include "IceOperand.h"
 #include "IceRegAlloc.h"
 #include "IceTargetLowering.h"
 #include "IceTargetLoweringARM32.h"
 #include "IceTargetLoweringMIPS32.h"
 #include "IceTargetLoweringX8632.h"
 
 namespace Ice {
 
 void LoweringContext::init(CfgNode *N) {
@@ skipping 405 matching lines @@
 #define SUBZERO_TARGET(X)                                                      \
   if (Target == Target_##X)                                                    \
     return TargetData##X::create(Ctx);
 #include "llvm/Config/SZTargets.def"
 
   llvm::report_fatal_error("Unsupported target data lowering");
 }
 
 TargetDataLowering::~TargetDataLowering() {}
 
+void TargetDataLowering::emitGlobal(const VariableDeclaration &Var) {
+  if (!ALLOW_DUMP)
+    return;
+
+  // If external and not initialized, this must be a cross test.
+  // Don't generate a declaration for such cases.
+  bool IsExternal = Var.isExternal() || Ctx->getFlags().getDisableInternal();
+  if (IsExternal && !Var.hasInitializer())
+    return;
+
+  Ostream &Str = Ctx->getStrEmit();
+  const VariableDeclaration::InitializerListType &Initializers =
+      Var.getInitializers();
+  bool HasNonzeroInitializer = Var.hasNonzeroInitializer();
+  bool IsConstant = Var.getIsConstant();
+  uint32_t Align = Var.getAlignment();
+  SizeT Size = Var.getNumBytes();
+  IceString MangledName = Var.mangleName(Ctx);
+  IceString SectionSuffix = "";
+  if (Ctx->getFlags().getDataSections())
+    SectionSuffix = "." + MangledName;
+
+  Str << "\t.type\t" << MangledName << ",%object\n";
+
+  if (IsConstant)
+    Str << "\t.section\t.rodata" << SectionSuffix << ",\"a\",%progbits\n";
+  else if (HasNonzeroInitializer)
+    Str << "\t.section\t.data" << SectionSuffix << ",\"aw\",%progbits\n";
+  else
+    Str << "\t.section\t.bss" << SectionSuffix << ",\"aw\",%nobits\n";
+
+  if (IsExternal)
+    Str << "\t.globl\t" << MangledName << "\n";
+
+  if (Align > 1) {
+    assert(llvm::isPowerOf2_32(Align));
+    // Use the .p2align directive, since the .align N directive can either
+    // interpret N as bytes, or power of 2 bytes, depending on the target.
+    Str << "\t.p2align\t" << llvm::Log2_32(Align) << "\n";
+  }
+
+  Str << MangledName << ":\n";
+
+  if (HasNonzeroInitializer) {
+    for (VariableDeclaration::Initializer *Init : Initializers) {
+      switch (Init->getKind()) {
+      case VariableDeclaration::Initializer::DataInitializerKind: {
+        const auto Data = llvm::cast<VariableDeclaration::DataInitializer>(Init)
+                              ->getContents();
+        for (SizeT i = 0; i < Init->getNumBytes(); ++i) {
+          Str << "\t.byte\t" << (((unsigned)Data[i]) & 0xff) << "\n";
+        }
+        break;
+      }
+      case VariableDeclaration::Initializer::ZeroInitializerKind:
+        Str << "\t.zero\t" << Init->getNumBytes() << "\n";
+        break;
+      case VariableDeclaration::Initializer::RelocInitializerKind: {
+        const auto Reloc =
+            llvm::cast<VariableDeclaration::RelocInitializer>(Init);
+        Str << "\t" << getEmit32Directive() << "\t";
+        Str << Reloc->getDeclaration()->mangleName(Ctx);
+        if (RelocOffsetT Offset = Reloc->getOffset()) {
+          if (Offset >= 0 || (Offset == INT32_MIN))
+            Str << " + " << Offset;
+          else
+            Str << " - " << -Offset;
+        }
+        Str << "\n";
+        break;
+      }
+      }
+    }
+  } else
+    // NOTE: for non-constant zero initializers, this is BSS (no bits),
+    // so an ELF writer would not write to the file, and only track
+    // virtual offsets, but the .s writer still needs this .zero and
+    // cannot simply use the .size to advance offsets.
+    Str << "\t.zero\t" << Size << "\n";
+
+  Str << "\t.size\t" << MangledName << ", " << Size << "\n";
+}
+
 std::unique_ptr<TargetHeaderLowering>
 TargetHeaderLowering::createLowering(GlobalContext *Ctx) {
   TargetArch Target = Ctx->getFlags().getTargetArch();
 #define SUBZERO_TARGET(X)                                                      \
   if (Target == Target_##X)                                                    \
     return TargetHeader##X::create(Ctx);
 #include "llvm/Config/SZTargets.def"
 
   llvm::report_fatal_error("Unsupported target header lowering");
 }
 
 TargetHeaderLowering::~TargetHeaderLowering() {}
 
 } // end of namespace Ice