From abb247fc036d55d06b06853cae66ab055269d605 Mon Sep 17 00:00:00 2001 From: Anton Korobeynikov Date: Sun, 17 Aug 2008 13:53:04 +0000 Subject: [PATCH] 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}/AsmPrinter.cpp | 0 lib/CodeGen/{ => AsmPrinter}/DwarfWriter.cpp | 0 lib/CodeGen/AsmPrinter/Makefile | 15 ++ .../AsmPrinter/OcamlGCMetadataPrinter.cpp | 157 ++++++++++++++++++ lib/CodeGen/Makefile | 2 +- 5 files changed, 173 insertions(+), 1 deletion(-) rename lib/CodeGen/{ => AsmPrinter}/AsmPrinter.cpp (100%) rename lib/CodeGen/{ => AsmPrinter}/DwarfWriter.cpp (100%) create mode 100644 lib/CodeGen/AsmPrinter/Makefile create mode 100644 lib/CodeGen/AsmPrinter/OcamlGCMetadataPrinter.cpp diff --git a/lib/CodeGen/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp similarity index 100% rename from lib/CodeGen/AsmPrinter.cpp rename to lib/CodeGen/AsmPrinter/AsmPrinter.cpp diff --git a/lib/CodeGen/DwarfWriter.cpp b/lib/CodeGen/AsmPrinter/DwarfWriter.cpp similarity index 100% rename from lib/CodeGen/DwarfWriter.cpp rename to lib/CodeGen/AsmPrinter/DwarfWriter.cpp diff --git a/lib/CodeGen/AsmPrinter/Makefile b/lib/CodeGen/AsmPrinter/Makefile new file mode 100644 index 00000000000..c11f42647d3 --- /dev/null +++ b/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 diff --git a/lib/CodeGen/AsmPrinter/OcamlGCMetadataPrinter.cpp b/lib/CodeGen/AsmPrinter/OcamlGCMetadataPrinter.cpp new file mode 100644 index 00000000000..d1208e2d248 --- /dev/null +++ b/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 +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); + } + } +} diff --git a/lib/CodeGen/Makefile b/lib/CodeGen/Makefile index e2f569bbb23..29158e2dde7 100644 --- a/lib/CodeGen/Makefile +++ b/lib/CodeGen/Makefile @@ -9,7 +9,7 @@ LEVEL = ../.. LIBRARYNAME = LLVMCodeGen -PARALLEL_DIRS = SelectionDAG +PARALLEL_DIRS = SelectionDAG AsmPrinter BUILD_ARCHIVE = 1 include $(LEVEL)/Makefile.common