Move all assembler printing related stuff into new libAsmPrinter

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54885 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/Makefile

@@ -0,0 +1,15 @@
+##===- lib/CodeGen/SelectionDAG/Makefile -------------------*- Makefile -*-===##
+# 
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+# 
+##===----------------------------------------------------------------------===##
+LEVEL = ../../..
+LIBRARYNAME = LLVMAsmPrinter
+PARALLEL_DIRS =
+BUILD_ARCHIVE = 1
+DONT_BUILD_RELINKED = 1
+
+include $(LEVEL)/Makefile.common

lib/CodeGen/AsmPrinter/OcamlGCMetadataPrinter.cpp

@@ -0,0 +1,157 @@
+//===-- OcamlGCMetadataPrinter.cpp - Ocaml frametable emitter -------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements gc metadata printing for the llvm.gc* intrinsics
+// compatible with Objective Caml 3.10.0, which uses a liveness-accurate static
+// stack map.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/Collectors.h"
+#include "llvm/CodeGen/Collector.h"
+#include "llvm/Module.h"
+#include "llvm/Target/TargetAsmInfo.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetMachine.h"
+
+using namespace llvm;
+
+namespace {
+  class VISIBILITY_HIDDEN OcamlGCMetadataPrinter : public GCMetadataPrinter {
+  public:
+    void beginAssembly(std::ostream &OS, AsmPrinter &AP,
+                       const TargetAsmInfo &TAI);
+    void finishAssembly(std::ostream &OS, AsmPrinter &AP,
+                        const TargetAsmInfo &TAI);
+  };
+}
+
+static GCMetadataPrinterRegistry::Add<OcamlGCMetadataPrinter>
+X("ocaml", "ocaml 3.10-compatible collector");
+
+static void EmitCamlGlobal(const Module &M, std::ostream &OS, AsmPrinter &AP,
+                           const TargetAsmInfo &TAI, const char *Id) {
+  const std::string &MId = M.getModuleIdentifier();
+
+  std::string Mangled;
+  Mangled += TAI.getGlobalPrefix();
+  Mangled += "caml";
+  size_t Letter = Mangled.size();
+  Mangled.append(MId.begin(), std::find(MId.begin(), MId.end(), '.'));
+  Mangled += "__";
+  Mangled += Id;
+
+  // Capitalize the first letter of the module name.
+  Mangled[Letter] = toupper(Mangled[Letter]);
+
+  if (const char *GlobalDirective = TAI.getGlobalDirective())
+    OS << GlobalDirective << Mangled << "\n";
+  OS << Mangled << ":\n";
+}
+
+void OcamlGCMetadataPrinter::beginAssembly(std::ostream &OS, AsmPrinter &AP,
+                                           const TargetAsmInfo &TAI) {
+  AP.SwitchToTextSection(TAI.getTextSection());
+  EmitCamlGlobal(getModule(), OS, AP, TAI, "code_begin");
+
+  AP.SwitchToDataSection(TAI.getDataSection());
+  EmitCamlGlobal(getModule(), OS, AP, TAI, "data_begin");
+}
+
+/// emitAssembly - Print the frametable. The ocaml frametable format is thus:
+///
+///   extern "C" struct align(sizeof(intptr_t)) {
+///     uint16_t NumDescriptors;
+///     struct align(sizeof(intptr_t)) {
+///       void *ReturnAddress;
+///       uint16_t FrameSize;
+///       uint16_t NumLiveOffsets;
+///       uint16_t LiveOffsets[NumLiveOffsets];
+///     } Descriptors[NumDescriptors];
+///   } caml${module}__frametable;
+///
+/// Note that this precludes programs from stack frames larger than 64K
+/// (FrameSize and LiveOffsets would overflow). FrameTablePrinter will abort if
+/// either condition is detected in a function which uses the collector.
+///
+void OcamlGCMetadataPrinter::finishAssembly(std::ostream &OS, AsmPrinter &AP,
+                                            const TargetAsmInfo &TAI) {
+  const char *AddressDirective;
+  int AddressAlignLog;
+  if (AP.TM.getTargetData()->getPointerSize() == sizeof(int32_t)) {
+    AddressDirective = TAI.getData32bitsDirective();
+    AddressAlignLog = 2;
+  } else {
+    AddressDirective = TAI.getData64bitsDirective();
+    AddressAlignLog = 3;
+  }
+
+  AP.SwitchToTextSection(TAI.getTextSection());
+  EmitCamlGlobal(getModule(), OS, AP, TAI, "code_end");
+
+  AP.SwitchToDataSection(TAI.getDataSection());
+  EmitCamlGlobal(getModule(), OS, AP, TAI, "data_end");
+
+  OS << AddressDirective << 0; // FIXME: Why does ocaml emit this??
+  AP.EOL();
+
+  AP.SwitchToDataSection(TAI.getDataSection());
+  EmitCamlGlobal(getModule(), OS, AP, TAI, "frametable");
+
+  for (iterator FI = begin(), FE = end(); FI != FE; ++FI) {
+    CollectorMetadata &MD = **FI;
+
+    OS << "\t" << TAI.getCommentString() << " live roots for "
+       << MD.getFunction().getNameStart() << "\n";
+
+    for (CollectorMetadata::iterator PI = MD.begin(),
+                                     PE = MD.end(); PI != PE; ++PI) {
+
+      uint64_t FrameSize = MD.getFrameSize();
+      if (FrameSize >= 1<<16) {
+        cerr << "Function '" << MD.getFunction().getNameStart()
+             << "' is too large for the ocaml collector! "
+             << "Frame size " << FrameSize << " >= 65536.\n";
+        abort(); // Very rude!
+      }
+
+      size_t LiveCount = MD.live_size(PI);
+      if (LiveCount >= 1<<16) {
+        cerr << "Function '" << MD.getFunction().getNameStart()
+             << "' is too large for the ocaml collector! "
+             << "Live root count " << LiveCount << " >= 65536.\n";
+        abort(); // Very rude!
+      }
+
+      OS << AddressDirective
+         << TAI.getPrivateGlobalPrefix() << "label" << PI->Num;
+      AP.EOL("call return address");
+
+      AP.EmitInt16(FrameSize);
+      AP.EOL("stack frame size");
+
+      AP.EmitInt16(LiveCount);
+      AP.EOL("live root count");
+
+      for (CollectorMetadata::live_iterator LI = MD.live_begin(PI),
+                                            LE = MD.live_end(PI);
+                                            LI != LE; ++LI) {
+        assert(LI->StackOffset < 1<<16 &&
+               "GC root stack offset is outside of fixed stack frame and out "
+               "of range for Ocaml collector!");
+
+        OS << "\t.word\t" << LI->StackOffset;
+        AP.EOL("stack offset");
+      }
+
+      AP.EmitAlignment(AddressAlignLog);
+    }
+  }
+}

lib/CodeGen/Makefile

@@ -9,7 +9,7 @@
 
 LEVEL = ../..
 LIBRARYNAME = LLVMCodeGen
-PARALLEL_DIRS = SelectionDAG
+PARALLEL_DIRS = SelectionDAG AsmPrinter
 BUILD_ARCHIVE = 1
 
 include $(LEVEL)/Makefile.common