[llvm-uc] [PATCH v2 2/3] uc32: Add TargetObjectFile
- From: Jia Liu <proljc@xxxxxxxxx>
- To: llvm-uc@xxxxxxxxxxxxx
- Date: Fri, 30 Nov 2012 15:58:38 +0800
---
lib/Target/UniCore/UniCoreTargetObjectFile.cpp | 81 ++++++++++++++++++++++++
lib/Target/UniCore/UniCoreTargetObjectFile.h | 42 ++++++++++++
2 files changed, 123 insertions(+)
create mode 100644 lib/Target/UniCore/UniCoreTargetObjectFile.cpp
create mode 100644 lib/Target/UniCore/UniCoreTargetObjectFile.h
diff --git a/lib/Target/UniCore/UniCoreTargetObjectFile.cpp
b/lib/Target/UniCore/UniCoreTargetObjectFile.cpp
new file mode 100644
index 0000000..ed320b3
--- /dev/null
+++ b/lib/Target/UniCore/UniCoreTargetObjectFile.cpp
@@ -0,0 +1,81 @@
+//===-- UniCoreTargetObjectFile.cpp - UniCore object files
----------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "UniCoreTargetObjectFile.h"
+#include "llvm/DataLayout.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/GlobalVariable.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCSectionELF.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ELF.h"
+
+using namespace llvm;
+
+void UniCoreTargetObjectFile::
+Initialize(MCContext &Ctx, const TargetMachine &TM) {
+}
+
+#if 0
+
+// A address must be loaded from a small section if its size is less than the
+// small section size threshold. Data in this section must be addressed using
+// gp_rel operator.
+static bool IsInSmallSection(uint64_t Size) {
+ return Size > 0 && Size <= 8;
+}
+
+bool UniCoreTargetObjectFile::
+IsGlobalInSmallSection(const GlobalValue *GV, const TargetMachine &TM) const {
+ if (GV->isDeclaration() || GV->hasAvailableExternallyLinkage())
+ return false;
+
+ return IsGlobalInSmallSection(GV, TM, getKindForGlobal(GV, TM));
+}
+
+/// IsGlobalInSmallSection - Return true if this global address should be
+/// placed into small data/bss section.
+bool UniCoreTargetObjectFile::
+IsGlobalInSmallSection(const GlobalValue *GV, const TargetMachine &TM,
+ SectionKind Kind) const {
+ // Only global variables, not functions.
+ const GlobalVariable *GVA = dyn_cast<GlobalVariable>(GV);
+ if (!GVA)
+ return false;
+
+ // We can only do this for datarel or BSS objects for now.
+ if (!Kind.isBSS() && !Kind.isDataRel())
+ return false;
+
+ // If this is a internal constant string, there is a special
+ // section for it, but not in small data/bss.
+ if (Kind.isMergeable1ByteCString())
+ return false;
+
+ Type *Ty = GV->getType()->getElementType();
+ return IsInSmallSection(TM.getDataLayout()->getTypeAllocSize(Ty));
+}
+
+const MCSection *UniCoreTargetObjectFile::
+SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
+ Mangler *Mang, const TargetMachine &TM) const {
+ // TODO: Could also support "weak" symbols as well with ".gnu.linkonce.s.*"
+ // sections?
+
+ // Handle Small Section classification here.
+ if (Kind.isBSS() && IsGlobalInSmallSection(GV, TM, Kind))
+ return SmallBSSSection;
+ if (Kind.isDataNoRel() && IsGlobalInSmallSection(GV, TM, Kind))
+ return SmallDataSection;
+
+ // Otherwise, we work the same as ELF.
+ return TargetLoweringObjectFileELF::SelectSectionForGlobal(GV, Kind,
Mang,TM);
+}
+#endif
diff --git a/lib/Target/UniCore/UniCoreTargetObjectFile.h
b/lib/Target/UniCore/UniCoreTargetObjectFile.h
new file mode 100644
index 0000000..1747773
--- /dev/null
+++ b/lib/Target/UniCore/UniCoreTargetObjectFile.h
@@ -0,0 +1,42 @@
+//===- llvm/Target/UniCoreTargetObjectFile.h - UniCore Obj. Info -*- C++
-*-==//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TARGET_UNICORE_TARGETOBJECTFILE_H
+#define LLVM_TARGET_UNICORE_TARGETOBJECTFILE_H
+
+#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
+
+namespace llvm {
+
+ class UniCoreTargetObjectFile : public TargetLoweringObjectFileELF {
+ const MCSection *SmallDataSection;
+ const MCSection *SmallBSSSection;
+ public:
+
+ void Initialize(MCContext &Ctx, const TargetMachine &TM);
+
+#if 0
+ /// IsGlobalInSmallSection - Return true if this global address should be
+ /// placed into small data/bss section.
+ bool IsGlobalInSmallSection(const GlobalValue *GV,
+ const TargetMachine &TM,
+ SectionKind Kind) const;
+
+ bool IsGlobalInSmallSection(const GlobalValue *GV,
+ const TargetMachine &TM) const;
+
+ const MCSection *SelectSectionForGlobal(const GlobalValue *GV,
+ SectionKind Kind,
+ Mangler *Mang,
+ const TargetMachine &TM) const;
+#endif
+ };
+} // end namespace llvm
+
+#endif
--
1.7.10.2 (Apple Git-33)
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