1 files changed, 216 insertions, 0 deletions
diff --git a/llvm/lib/ExecutionEngine/JITLink/COFF_x86_64.cpp b/llvm/lib/ExecutionEngine/JITLink/COFF_x86_64.cpp
new file mode 100644
index 000000000000..3d36ad1ed767
--- /dev/null
+++ b/llvm/lib/ExecutionEngine/JITLink/COFF_x86_64.cpp
@@ -0,0 +1,216 @@
+//===----- COFF_x86_64.cpp - JIT linker implementation for COFF/x86_64 ----===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// COFF/x86_64 jit-link implementation.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ExecutionEngine/JITLink/COFF_x86_64.h"
+#include "COFFLinkGraphBuilder.h"
+#include "EHFrameSupportImpl.h"
+#include "JITLinkGeneric.h"
+#include "llvm/BinaryFormat/COFF.h"
+#include "llvm/ExecutionEngine/JITLink/x86_64.h"
+#include "llvm/Object/COFF.h"
+#include "llvm/Support/Endian.h"
+
+#define DEBUG_TYPE "jitlink"
+
+using namespace llvm;
+using namespace llvm::jitlink;
+
+namespace {
+
+class COFFJITLinker_x86_64 : public JITLinker<COFFJITLinker_x86_64> {
+  friend class JITLinker<COFFJITLinker_x86_64>;
+
+public:
+  COFFJITLinker_x86_64(std::unique_ptr<JITLinkContext> Ctx,
+                       std::unique_ptr<LinkGraph> G,
+                       PassConfiguration PassConfig)
+      : JITLinker(std::move(Ctx), std::move(G), std::move(PassConfig)) {}
+
+private:
+  Error applyFixup(LinkGraph &G, Block &B, const Edge &E) const {
+    return x86_64::applyFixup(G, B, E, nullptr);
+  }
+};
+
+class COFFLinkGraphBuilder_x86_64 : public COFFLinkGraphBuilder {
+private:
+  uint64_t ImageBase = 0;
+  enum COFFX86RelocationKind {
+    COFFAddr32NB,
+    COFFRel32,
+  };
+
+  static Expected<COFFX86RelocationKind>
+  getRelocationKind(const uint32_t Type) {
+    switch (Type) {
+    case COFF::RelocationTypeAMD64::IMAGE_REL_AMD64_ADDR32NB:
+      return COFFAddr32NB;
+    case COFF::RelocationTypeAMD64::IMAGE_REL_AMD64_REL32:
+      return COFFRel32;
+    }
+
+    return make_error<JITLinkError>("Unsupported x86_64 relocation:" +
+                                    formatv("{0:d}", Type));
+  }
+
+  Error addRelocations() override {
+
+    LLVM_DEBUG(dbgs() << "Processing relocations:\n");
+
+    for (const auto &RelSect : sections())
+      if (Error Err = COFFLinkGraphBuilder::forEachRelocation(
+              RelSect, this, &COFFLinkGraphBuilder_x86_64::addSingleRelocation))
+        return Err;
+
+    return Error::success();
+  }
+
+  uint64_t getImageBase() {
+    if (!ImageBase) {
+      ImageBase = std::numeric_limits<uint64_t>::max();
+      for (const auto &Block : getGraph().blocks()) {
+        if (Block->getAddress().getValue())
+          ImageBase = std::min(ImageBase, Block->getAddress().getValue());
+      }
+    }
+    return ImageBase;
+  }
+
+  Error addSingleRelocation(const object::RelocationRef &Rel,
+                            const object::SectionRef &FixupSect,
+                            Block &BlockToFix) {
+
+    const object::coff_relocation *COFFRel = getObject().getCOFFRelocation(Rel);
+    auto SymbolIt = Rel.getSymbol();
+    if (SymbolIt == getObject().symbol_end()) {
+      return make_error<StringError>(
+          formatv("Invalid symbol index in relocation entry. "
+                  "index: {0}, section: {1}",
+                  COFFRel->SymbolTableIndex, FixupSect.getIndex()),
+          inconvertibleErrorCode());
+    }
+
+    object::COFFSymbolRef COFFSymbol = getObject().getCOFFSymbol(*SymbolIt);
+    COFFSymbolIndex SymIndex = getObject().getSymbolIndex(COFFSymbol);
+
+    Symbol *GraphSymbol = getGraphSymbol(SymIndex);
+    if (!GraphSymbol)
+      return make_error<StringError>(
+          formatv("Could not find symbol at given index, did you add it to "
+                  "JITSymbolTable? index: {0}, section: {1}",
+                  SymIndex, FixupSect.getIndex()),
+          inconvertibleErrorCode());
+
+    Expected<COFFX86RelocationKind> RelocKind =
+        getRelocationKind(Rel.getType());
+    if (!RelocKind)
+      return RelocKind.takeError();
+
+    int64_t Addend = 0;
+    orc::ExecutorAddr FixupAddress =
+        orc::ExecutorAddr(FixupSect.getAddress()) + Rel.getOffset();
+    Edge::OffsetT Offset = FixupAddress - BlockToFix.getAddress();
+
+    Edge::Kind Kind = Edge::Invalid;
+
+    switch (*RelocKind) {
+    case COFFAddr32NB: {
+      Kind = x86_64::Pointer32;
+      Offset -= getImageBase();
+      break;
+    }
+    case COFFRel32: {
+      Kind = x86_64::BranchPCRel32;
+      break;
+    }
+    };
+
+    Edge GE(Kind, Offset, *GraphSymbol, Addend);
+    LLVM_DEBUG({
+      dbgs() << "    ";
+      printEdge(dbgs(), BlockToFix, GE, x86_64::getEdgeKindName(Kind));
+      dbgs() << "\n";
+    });
+
+    BlockToFix.addEdge(std::move(GE));
+    return Error::success();
+  }
+
+  /// Return the string name of the given COFF x86_64 edge kind.
+  const char *getCOFFX86RelocationKindName(COFFX86RelocationKind R) {
+    switch (R) {
+    case COFFAddr32NB:
+      return "COFFAddr32NB";
+    case COFFRel32:
+      return "COFFRel32";
+    }
+  }
+
+public:
+  COFFLinkGraphBuilder_x86_64(const object::COFFObjectFile &Obj, const Triple T)
+      : COFFLinkGraphBuilder(Obj, std::move(T), x86_64::getEdgeKindName) {}
+};
+
+Error buildTables_COFF_x86_64(LinkGraph &G) {
+  LLVM_DEBUG(dbgs() << "Visiting edges in graph:\n");
+
+  x86_64::GOTTableManager GOT;
+  x86_64::PLTTableManager PLT(GOT);
+  visitExistingEdges(G, GOT, PLT);
+  return Error::success();
+}
+} // namespace
+
+namespace llvm {
+namespace jitlink {
+
+Expected<std::unique_ptr<LinkGraph>>
+createLinkGraphFromCOFFObject_x86_64(MemoryBufferRef ObjectBuffer) {
+  LLVM_DEBUG({
+    dbgs() << "Building jitlink graph for new input "
+           << ObjectBuffer.getBufferIdentifier() << "...\n";
+  });
+
+  auto COFFObj = object::ObjectFile::createCOFFObjectFile(ObjectBuffer);
+  if (!COFFObj)
+    return COFFObj.takeError();
+
+  return COFFLinkGraphBuilder_x86_64(**COFFObj, (*COFFObj)->makeTriple())
+      .buildGraph();
+}
+
+void link_COFF_x86_64(std::unique_ptr<LinkGraph> G,
+                      std::unique_ptr<JITLinkContext> Ctx) {
+  PassConfiguration Config;
+  const Triple &TT = G->getTargetTriple();
+  if (Ctx->shouldAddDefaultTargetPasses(TT)) {
+    // Add a mark-live pass.
+    if (auto MarkLive = Ctx->getMarkLivePass(TT))
+      Config.PrePrunePasses.push_back(std::move(MarkLive));
+    else
+      Config.PrePrunePasses.push_back(markAllSymbolsLive);
+
+    // Add an in-place GOT/Stubs/TLSInfoEntry build pass.
+    Config.PostPrunePasses.push_back(buildTables_COFF_x86_64);
+
+    // Add GOT/Stubs optimizer pass.
+    Config.PreFixupPasses.push_back(x86_64::optimizeGOTAndStubAccesses);
+  }
+
+  if (auto Err = Ctx->modifyPassConfig(*G, Config))
+    return Ctx->notifyFailed(std::move(Err));
+
+  COFFJITLinker_x86_64::link(std::move(Ctx), std::move(G), std::move(Config));
+}
+
+} // namespace jitlink
+} // namespace llvm