-//===-- OcamlCollector.cpp - Ocaml frametable emitter ---------------------===//
+//===-- OcamlGCPrinter.cpp - Ocaml frametable emitter ---------------------===//
//
// The LLVM Compiler Infrastructure
//
//
//===----------------------------------------------------------------------===//
//
-// This file implements lowering for the llvm.gc* intrinsics compatible with
-// Objective Caml 3.10.0, which uses a liveness-accurate static stack map.
+// This file implements printing the assembly code for an Ocaml frametable.
//
//===----------------------------------------------------------------------===//
-
+
#include "llvm/CodeGen/GCs.h"
#include "llvm/CodeGen/AsmPrinter.h"
-#include "llvm/CodeGen/GCStrategy.h"
+#include "llvm/CodeGen/GCMetadataPrinter.h"
#include "llvm/Module.h"
-#include "llvm/Target/TargetAsmInfo.h"
-#include "llvm/Target/TargetData.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/Target/Mangler.h"
+#include "llvm/DataLayout.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetMachine.h"
-
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FormattedStream.h"
+#include <cctype>
using namespace llvm;
namespace {
- class VISIBILITY_HIDDEN OcamlGCMetadataPrinter : public GCMetadataPrinter {
+ class OcamlGCMetadataPrinter : public GCMetadataPrinter {
public:
- void beginAssembly(std::ostream &OS, AsmPrinter &AP,
- const TargetAsmInfo &TAI);
-
- void finishAssembly(std::ostream &OS, AsmPrinter &AP,
- const TargetAsmInfo &TAI);
+ void beginAssembly(AsmPrinter &AP);
+ void finishAssembly(AsmPrinter &AP);
};
-
+
}
static GCMetadataPrinterRegistry::Add<OcamlGCMetadataPrinter>
Y("ocaml", "ocaml 3.10-compatible collector");
-GCMetadataPrinter *llvm::createOcamlMetadataPrinter() {
- return new OcamlGCMetadataPrinter();
-}
+void llvm::linkOcamlGCPrinter() { }
-static void EmitCamlGlobal(const Module &M, std::ostream &OS, AsmPrinter &AP,
- const TargetAsmInfo &TAI, const char *Id) {
+static void EmitCamlGlobal(const Module &M, AsmPrinter &AP, 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;
-
+
+ std::string SymName;
+ SymName += "caml";
+ size_t Letter = SymName.size();
+ SymName.append(MId.begin(), std::find(MId.begin(), MId.end(), '.'));
+ SymName += "__";
+ SymName += 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";
+ SymName[Letter] = toupper(SymName[Letter]);
+
+ SmallString<128> TmpStr;
+ AP.Mang->getNameWithPrefix(TmpStr, SymName);
+
+ MCSymbol *Sym = AP.OutContext.GetOrCreateSymbol(TmpStr);
+
+ AP.OutStreamer.EmitSymbolAttribute(Sym, MCSA_Global);
+ AP.OutStreamer.EmitLabel(Sym);
}
-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");
+void OcamlGCMetadataPrinter::beginAssembly(AsmPrinter &AP) {
+ AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getTextSection());
+ EmitCamlGlobal(getModule(), AP, "code_begin");
+
+ AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getDataSection());
+ EmitCamlGlobal(getModule(), AP, "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)) {
/// 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;
+/// either condition is detected in a function which uses the GC.
+///
+void OcamlGCMetadataPrinter::finishAssembly(AsmPrinter &AP) {
+ unsigned IntPtrSize = AP.TM.getDataLayout()->getPointerSize(0);
+
+ AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getTextSection());
+ EmitCamlGlobal(getModule(), AP, "code_end");
+
+ AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getDataSection());
+ EmitCamlGlobal(getModule(), AP, "data_end");
+
+ // FIXME: Why does ocaml emit this??
+ AP.OutStreamer.EmitIntValue(0, IntPtrSize, 0);
+
+ AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getDataSection());
+ EmitCamlGlobal(getModule(), AP, "frametable");
+
+ int NumDescriptors = 0;
+ for (iterator I = begin(), IE = end(); I != IE; ++I) {
+ GCFunctionInfo &FI = **I;
+ for (GCFunctionInfo::iterator J = FI.begin(), JE = FI.end(); J != JE; ++J) {
+ NumDescriptors++;
+ }
}
- 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 (NumDescriptors >= 1<<16) {
+ // Very rude!
+ report_fatal_error(" Too much descriptor for ocaml GC");
+ }
+ AP.EmitInt16(NumDescriptors);
+ AP.EmitAlignment(IntPtrSize == 4 ? 2 : 3);
+
+ for (iterator I = begin(), IE = end(); I != IE; ++I) {
+ GCFunctionInfo &FI = **I;
+
+ uint64_t FrameSize = FI.getFrameSize();
+ if (FrameSize >= 1<<16) {
+ // Very rude!
+ report_fatal_error("Function '" + FI.getFunction().getName() +
+ "' is too large for the ocaml GC! "
+ "Frame size " + Twine(FrameSize) + ">= 65536.\n"
+ "(" + Twine(uintptr_t(&FI)) + ")");
+ }
+
+ AP.OutStreamer.AddComment("live roots for " +
+ Twine(FI.getFunction().getName()));
+ AP.OutStreamer.AddBlankLine();
+
+ for (GCFunctionInfo::iterator J = FI.begin(), JE = FI.end(); J != JE; ++J) {
+ size_t LiveCount = FI.live_size(J);
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!
+ // Very rude!
+ report_fatal_error("Function '" + FI.getFunction().getName() +
+ "' is too large for the ocaml GC! "
+ "Live root count "+Twine(LiveCount)+" >= 65536.");
}
-
- OS << AddressDirective
- << TAI.getPrivateGlobalPrefix() << "label" << PI->Num;
- AP.EOL("call return address");
-
+
+ AP.OutStreamer.EmitSymbolValue(J->Label, IntPtrSize, 0);
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");
+
+ for (GCFunctionInfo::live_iterator K = FI.live_begin(J),
+ KE = FI.live_end(J); K != KE; ++K) {
+ if (K->StackOffset >= 1<<16) {
+ // Very rude!
+ report_fatal_error(
+ "GC root stack offset is outside of fixed stack frame and out "
+ "of range for ocaml GC!");
+ }
+ AP.EmitInt16(K->StackOffset);
}
-
- AP.EmitAlignment(AddressAlignLog);
+
+ AP.EmitAlignment(IntPtrSize == 4 ? 2 : 3);
}
}
}
projects / oota-llvm.git / blobdiff