mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79777 91177308-0d34-0410-b5e6-96231b3b80d8
167 lines
5.7 KiB
C++
167 lines
5.7 KiB
C++
//===-- OcamlGCPrinter.cpp - Ocaml frametable emitter ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements printing the assembly code for an Ocaml frametable.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/GCs.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/GCMetadataPrinter.h"
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#include "llvm/Module.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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namespace {
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class VISIBILITY_HIDDEN OcamlGCMetadataPrinter : public GCMetadataPrinter {
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public:
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void beginAssembly(raw_ostream &OS, AsmPrinter &AP,
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const MCAsmInfo &MAI);
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void finishAssembly(raw_ostream &OS, AsmPrinter &AP,
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const MCAsmInfo &MAI);
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};
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}
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static GCMetadataPrinterRegistry::Add<OcamlGCMetadataPrinter>
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Y("ocaml", "ocaml 3.10-compatible collector");
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void llvm::linkOcamlGCPrinter() { }
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static void EmitCamlGlobal(const Module &M, raw_ostream &OS, AsmPrinter &AP,
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const MCAsmInfo &MAI, const char *Id) {
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const std::string &MId = M.getModuleIdentifier();
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std::string Mangled;
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Mangled += MAI.getGlobalPrefix();
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Mangled += "caml";
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size_t Letter = Mangled.size();
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Mangled.append(MId.begin(), std::find(MId.begin(), MId.end(), '.'));
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Mangled += "__";
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Mangled += Id;
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// Capitalize the first letter of the module name.
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Mangled[Letter] = toupper(Mangled[Letter]);
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if (const char *GlobalDirective = MAI.getGlobalDirective())
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OS << GlobalDirective << Mangled << "\n";
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OS << Mangled << ":\n";
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}
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void OcamlGCMetadataPrinter::beginAssembly(raw_ostream &OS, AsmPrinter &AP,
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const MCAsmInfo &MAI) {
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AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getTextSection());
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EmitCamlGlobal(getModule(), OS, AP, MAI, "code_begin");
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AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getDataSection());
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EmitCamlGlobal(getModule(), OS, AP, MAI, "data_begin");
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}
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/// emitAssembly - Print the frametable. The ocaml frametable format is thus:
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///
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/// extern "C" struct align(sizeof(intptr_t)) {
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/// uint16_t NumDescriptors;
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/// struct align(sizeof(intptr_t)) {
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/// void *ReturnAddress;
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/// uint16_t FrameSize;
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/// uint16_t NumLiveOffsets;
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/// uint16_t LiveOffsets[NumLiveOffsets];
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/// } Descriptors[NumDescriptors];
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/// } caml${module}__frametable;
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///
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/// Note that this precludes programs from stack frames larger than 64K
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/// (FrameSize and LiveOffsets would overflow). FrameTablePrinter will abort if
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/// either condition is detected in a function which uses the GC.
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///
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void OcamlGCMetadataPrinter::finishAssembly(raw_ostream &OS, AsmPrinter &AP,
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const MCAsmInfo &MAI) {
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const char *AddressDirective;
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int AddressAlignLog;
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if (AP.TM.getTargetData()->getPointerSize() == sizeof(int32_t)) {
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AddressDirective = MAI.getData32bitsDirective();
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AddressAlignLog = 2;
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} else {
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AddressDirective = MAI.getData64bitsDirective();
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AddressAlignLog = 3;
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}
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AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getTextSection());
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EmitCamlGlobal(getModule(), OS, AP, MAI, "code_end");
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AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getDataSection());
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EmitCamlGlobal(getModule(), OS, AP, MAI, "data_end");
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OS << AddressDirective << 0; // FIXME: Why does ocaml emit this??
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AP.EOL();
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AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getDataSection());
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EmitCamlGlobal(getModule(), OS, AP, MAI, "frametable");
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for (iterator I = begin(), IE = end(); I != IE; ++I) {
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GCFunctionInfo &FI = **I;
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uint64_t FrameSize = FI.getFrameSize();
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if (FrameSize >= 1<<16) {
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std::string msg;
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raw_string_ostream Msg(msg);
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Msg << "Function '" << FI.getFunction().getName()
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<< "' is too large for the ocaml GC! "
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<< "Frame size " << FrameSize << " >= 65536.\n";
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Msg << "(" << uintptr_t(&FI) << ")";
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llvm_report_error(Msg.str()); // Very rude!
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}
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OS << "\t" << MAI.getCommentString() << " live roots for "
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<< FI.getFunction().getName() << "\n";
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for (GCFunctionInfo::iterator J = FI.begin(), JE = FI.end(); J != JE; ++J) {
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size_t LiveCount = FI.live_size(J);
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if (LiveCount >= 1<<16) {
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std::string msg;
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raw_string_ostream Msg(msg);
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Msg << "Function '" << FI.getFunction().getName()
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<< "' is too large for the ocaml GC! "
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<< "Live root count " << LiveCount << " >= 65536.";
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llvm_report_error(Msg.str()); // Very rude!
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}
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OS << AddressDirective
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<< MAI.getPrivateGlobalPrefix() << "label" << J->Num;
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AP.EOL("call return address");
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AP.EmitInt16(FrameSize);
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AP.EOL("stack frame size");
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AP.EmitInt16(LiveCount);
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AP.EOL("live root count");
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for (GCFunctionInfo::live_iterator K = FI.live_begin(J),
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KE = FI.live_end(J); K != KE; ++K) {
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assert(K->StackOffset < 1<<16 &&
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"GC root stack offset is outside of fixed stack frame and out "
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"of range for ocaml GC!");
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OS << "\t.word\t" << K->StackOffset;
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AP.EOL("stack offset");
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}
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AP.EmitAlignment(AddressAlignLog);
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}
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}
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}
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