Check in LLVM r95781.
diff --git a/lib/CodeGen/AsmPrinter/OcamlGCPrinter.cpp b/lib/CodeGen/AsmPrinter/OcamlGCPrinter.cpp
new file mode 100644
index 0000000..3531ed6
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/OcamlGCPrinter.cpp
@@ -0,0 +1,160 @@
+//===-- OcamlGCPrinter.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 printing the assembly code for an Ocaml frametable.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/GCs.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/GCMetadataPrinter.h"
+#include "llvm/Module.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FormattedStream.h"
+using namespace llvm;
+
+namespace {
+
+ class OcamlGCMetadataPrinter : public GCMetadataPrinter {
+ public:
+ void beginAssembly(raw_ostream &OS, AsmPrinter &AP,
+ const MCAsmInfo &MAI);
+
+ void finishAssembly(raw_ostream &OS, AsmPrinter &AP,
+ const MCAsmInfo &MAI);
+ };
+
+}
+
+static GCMetadataPrinterRegistry::Add<OcamlGCMetadataPrinter>
+Y("ocaml", "ocaml 3.10-compatible collector");
+
+void llvm::linkOcamlGCPrinter() { }
+
+static void EmitCamlGlobal(const Module &M, raw_ostream &OS, AsmPrinter &AP,
+ const MCAsmInfo &MAI, const char *Id) {
+ const std::string &MId = M.getModuleIdentifier();
+
+ std::string Mangled;
+ Mangled += MAI.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 = MAI.getGlobalDirective())
+ OS << GlobalDirective << Mangled << "\n";
+ OS << Mangled << ":\n";
+}
+
+void OcamlGCMetadataPrinter::beginAssembly(raw_ostream &OS, AsmPrinter &AP,
+ const MCAsmInfo &MAI) {
+ AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getTextSection());
+ EmitCamlGlobal(getModule(), OS, AP, MAI, "code_begin");
+
+ AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getDataSection());
+ EmitCamlGlobal(getModule(), OS, AP, MAI, "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 GC.
+///
+void OcamlGCMetadataPrinter::finishAssembly(raw_ostream &OS, AsmPrinter &AP,
+ const MCAsmInfo &MAI) {
+ const char *AddressDirective;
+ int AddressAlignLog;
+ if (AP.TM.getTargetData()->getPointerSize() == sizeof(int32_t)) {
+ AddressDirective = MAI.getData32bitsDirective();
+ AddressAlignLog = 2;
+ } else {
+ AddressDirective = MAI.getData64bitsDirective();
+ AddressAlignLog = 3;
+ }
+
+ AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getTextSection());
+ EmitCamlGlobal(getModule(), OS, AP, MAI, "code_end");
+
+ AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getDataSection());
+ EmitCamlGlobal(getModule(), OS, AP, MAI, "data_end");
+
+ OS << AddressDirective << 0 << '\n'; // FIXME: Why does ocaml emit this??
+
+ AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getDataSection());
+ EmitCamlGlobal(getModule(), OS, AP, MAI, "frametable");
+
+ for (iterator I = begin(), IE = end(); I != IE; ++I) {
+ GCFunctionInfo &FI = **I;
+
+ uint64_t FrameSize = FI.getFrameSize();
+ if (FrameSize >= 1<<16) {
+ std::string msg;
+ raw_string_ostream Msg(msg);
+ Msg << "Function '" << FI.getFunction().getName()
+ << "' is too large for the ocaml GC! "
+ << "Frame size " << FrameSize << " >= 65536.\n";
+ Msg << "(" << uintptr_t(&FI) << ")";
+ llvm_report_error(Msg.str()); // Very rude!
+ }
+
+ OS << "\t" << MAI.getCommentString() << " live roots for "
+ << FI.getFunction().getName() << "\n";
+
+ for (GCFunctionInfo::iterator J = FI.begin(), JE = FI.end(); J != JE; ++J) {
+ size_t LiveCount = FI.live_size(J);
+ if (LiveCount >= 1<<16) {
+ std::string msg;
+ raw_string_ostream Msg(msg);
+ Msg << "Function '" << FI.getFunction().getName()
+ << "' is too large for the ocaml GC! "
+ << "Live root count " << LiveCount << " >= 65536.";
+ llvm_report_error(Msg.str()); // Very rude!
+ }
+
+ OS << AddressDirective
+ << MAI.getPrivateGlobalPrefix() << "label" << J->Num << '\n';
+
+ AP.EmitInt16(FrameSize);
+
+ AP.EmitInt16(LiveCount);
+
+ for (GCFunctionInfo::live_iterator K = FI.live_begin(J),
+ KE = FI.live_end(J); K != KE; ++K) {
+ assert(K->StackOffset < 1<<16 &&
+ "GC root stack offset is outside of fixed stack frame and out "
+ "of range for ocaml GC!");
+
+ AP.EmitInt32(K->StackOffset);
+ }
+
+ AP.EmitAlignment(AddressAlignLog);
+ }
+ }
+}