cbf5af9668
These are identified by misc-include-cleaner. I've filtered out those that break builds. Also, I'm staying away from llvm-config.h, config.h, and Compiler.h, which likely cause platform- or compiler-specific build failures.
535 lines
18 KiB
C++
535 lines
18 KiB
C++
//===- lib/MC/GOFFObjectWriter.cpp - GOFF File Writer ---------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements GOFF object file writer information.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/BinaryFormat/GOFF.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCGOFFAttributes.h"
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#include "llvm/MC/MCGOFFObjectWriter.h"
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#include "llvm/MC/MCSectionGOFF.h"
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#include "llvm/MC/MCSymbolGOFF.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/Support/ConvertEBCDIC.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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#define DEBUG_TYPE "goff-writer"
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namespace {
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// Common flag values on records.
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// Flag: This record is continued.
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constexpr uint8_t RecContinued = GOFF::Flags(7, 1, 1);
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// Flag: This record is a continuation.
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constexpr uint8_t RecContinuation = GOFF::Flags(6, 1, 1);
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// The GOFFOstream is responsible to write the data into the fixed physical
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// records of the format. A user of this class announces the begin of a new
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// logical record. While writing the payload, the physical records are created
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// for the data. Possible fill bytes at the end of a physical record are written
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// automatically. In principle, the GOFFOstream is agnostic of the endianness of
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// the payload. However, it also supports writing data in big endian byte order.
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//
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// The physical records use the flag field to indicate if the there is a
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// successor and predecessor record. To be able to set these flags while
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// writing, the basic implementation idea is to always buffer the last seen
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// physical record.
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class GOFFOstream {
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/// The underlying raw_pwrite_stream.
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raw_pwrite_stream &OS;
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/// The number of logical records emitted so far.
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uint32_t LogicalRecords = 0;
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/// The number of physical records emitted so far.
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uint32_t PhysicalRecords = 0;
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/// The size of the buffer. Same as the payload size of a physical record.
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static constexpr uint8_t BufferSize = GOFF::PayloadLength;
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/// Current position in buffer.
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char *BufferPtr = Buffer;
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/// Static allocated buffer for the stream.
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char Buffer[BufferSize];
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/// The type of the current logical record, and the flags (aka continued and
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/// continuation indicators) for the previous (physical) record.
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uint8_t TypeAndFlags = 0;
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public:
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GOFFOstream(raw_pwrite_stream &OS);
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~GOFFOstream();
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raw_pwrite_stream &getOS() { return OS; }
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size_t getWrittenSize() const { return PhysicalRecords * GOFF::RecordLength; }
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uint32_t getNumLogicalRecords() { return LogicalRecords; }
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/// Write the specified bytes.
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void write(const char *Ptr, size_t Size);
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/// Write zeroes, up to a maximum of 16 bytes.
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void write_zeros(unsigned NumZeros);
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/// Support for endian-specific data.
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template <typename value_type> void writebe(value_type Value) {
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Value =
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support::endian::byte_swap<value_type>(Value, llvm::endianness::big);
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write((const char *)&Value, sizeof(value_type));
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}
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/// Begin a new logical record. Implies finalizing the previous record.
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void newRecord(GOFF::RecordType Type);
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/// Ends a logical record.
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void finalizeRecord();
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private:
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/// Updates the continued/continuation flags, and writes the record prefix of
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/// a physical record.
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void updateFlagsAndWritePrefix(bool IsContinued);
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/// Returns the remaining size in the buffer.
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size_t getRemainingSize();
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};
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} // namespace
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GOFFOstream::GOFFOstream(raw_pwrite_stream &OS) : OS(OS) {}
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GOFFOstream::~GOFFOstream() { finalizeRecord(); }
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void GOFFOstream::updateFlagsAndWritePrefix(bool IsContinued) {
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// Update the flags based on the previous state and the flag IsContinued.
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if (TypeAndFlags & RecContinued)
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TypeAndFlags |= RecContinuation;
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if (IsContinued)
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TypeAndFlags |= RecContinued;
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else
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TypeAndFlags &= ~RecContinued;
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OS << static_cast<unsigned char>(GOFF::PTVPrefix) // Record Type
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<< static_cast<unsigned char>(TypeAndFlags) // Continuation
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<< static_cast<unsigned char>(0); // Version
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++PhysicalRecords;
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}
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size_t GOFFOstream::getRemainingSize() {
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return size_t(&Buffer[BufferSize] - BufferPtr);
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}
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void GOFFOstream::write(const char *Ptr, size_t Size) {
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size_t RemainingSize = getRemainingSize();
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// Data fits into the buffer.
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if (LLVM_LIKELY(Size <= RemainingSize)) {
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memcpy(BufferPtr, Ptr, Size);
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BufferPtr += Size;
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return;
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}
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// Otherwise the buffer is partially filled or full, and data does not fit
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// into it.
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updateFlagsAndWritePrefix(/*IsContinued=*/true);
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OS.write(Buffer, size_t(BufferPtr - Buffer));
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if (RemainingSize > 0) {
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OS.write(Ptr, RemainingSize);
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Ptr += RemainingSize;
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Size -= RemainingSize;
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}
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while (Size > BufferSize) {
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updateFlagsAndWritePrefix(/*IsContinued=*/true);
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OS.write(Ptr, BufferSize);
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Ptr += BufferSize;
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Size -= BufferSize;
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}
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// The remaining bytes fit into the buffer.
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memcpy(Buffer, Ptr, Size);
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BufferPtr = &Buffer[Size];
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}
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void GOFFOstream::write_zeros(unsigned NumZeros) {
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assert(NumZeros <= 16 && "Range for zeros too large");
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// Handle the common case first: all fits in the buffer.
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size_t RemainingSize = getRemainingSize();
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if (LLVM_LIKELY(RemainingSize >= NumZeros)) {
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memset(BufferPtr, 0, NumZeros);
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BufferPtr += NumZeros;
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return;
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}
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// Otherwise some field value is cleared.
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static char Zeros[16] = {
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0,
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};
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write(Zeros, NumZeros);
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}
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void GOFFOstream::newRecord(GOFF::RecordType Type) {
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finalizeRecord();
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TypeAndFlags = Type << 4;
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++LogicalRecords;
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}
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void GOFFOstream::finalizeRecord() {
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if (Buffer == BufferPtr)
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return;
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updateFlagsAndWritePrefix(/*IsContinued=*/false);
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OS.write(Buffer, size_t(BufferPtr - Buffer));
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OS.write_zeros(getRemainingSize());
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BufferPtr = Buffer;
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}
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namespace {
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// A GOFFSymbol holds all the data required for writing an ESD record.
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class GOFFSymbol {
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public:
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std::string Name;
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uint32_t EsdId;
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uint32_t ParentEsdId;
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uint64_t Offset = 0; // Offset of the symbol into the section. LD only.
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// Offset is only 32 bit, the larger type is used to
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// enable error checking.
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GOFF::ESDSymbolType SymbolType;
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GOFF::ESDNameSpaceId NameSpace = GOFF::ESD_NS_ProgramManagementBinder;
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GOFF::BehavioralAttributes BehavAttrs;
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GOFF::SymbolFlags SymbolFlags;
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uint32_t SortKey = 0;
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uint32_t SectionLength = 0;
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uint32_t ADAEsdId = 0;
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uint32_t EASectionEDEsdId = 0;
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uint32_t EASectionOffset = 0;
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uint8_t FillByteValue = 0;
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GOFFSymbol() : EsdId(0), ParentEsdId(0) {}
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GOFFSymbol(StringRef Name, uint32_t EsdID, const GOFF::SDAttr &Attr)
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: Name(Name.data(), Name.size()), EsdId(EsdID), ParentEsdId(0),
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SymbolType(GOFF::ESD_ST_SectionDefinition) {
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BehavAttrs.setTaskingBehavior(Attr.TaskingBehavior);
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BehavAttrs.setBindingScope(Attr.BindingScope);
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}
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GOFFSymbol(StringRef Name, uint32_t EsdID, uint32_t ParentEsdID,
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const GOFF::EDAttr &Attr)
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: Name(Name.data(), Name.size()), EsdId(EsdID), ParentEsdId(ParentEsdID),
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SymbolType(GOFF::ESD_ST_ElementDefinition) {
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this->NameSpace = Attr.NameSpace;
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// We always set a fill byte value.
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this->FillByteValue = Attr.FillByteValue;
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SymbolFlags.setFillBytePresence(1);
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SymbolFlags.setReservedQwords(Attr.ReservedQwords);
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// TODO Do we need/should set the "mangled" flag?
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BehavAttrs.setReadOnly(Attr.IsReadOnly);
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BehavAttrs.setRmode(Attr.Rmode);
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BehavAttrs.setTextStyle(Attr.TextStyle);
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BehavAttrs.setBindingAlgorithm(Attr.BindAlgorithm);
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BehavAttrs.setLoadingBehavior(Attr.LoadBehavior);
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BehavAttrs.setAlignment(Attr.Alignment);
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}
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GOFFSymbol(StringRef Name, uint32_t EsdID, uint32_t ParentEsdID,
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GOFF::ESDNameSpaceId NameSpace, const GOFF::LDAttr &Attr)
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: Name(Name.data(), Name.size()), EsdId(EsdID), ParentEsdId(ParentEsdID),
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SymbolType(GOFF::ESD_ST_LabelDefinition), NameSpace(NameSpace) {
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SymbolFlags.setRenameable(Attr.IsRenamable);
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BehavAttrs.setExecutable(Attr.Executable);
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BehavAttrs.setBindingStrength(Attr.BindingStrength);
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BehavAttrs.setLinkageType(Attr.Linkage);
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BehavAttrs.setAmode(Attr.Amode);
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BehavAttrs.setBindingScope(Attr.BindingScope);
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}
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GOFFSymbol(StringRef Name, uint32_t EsdID, uint32_t ParentEsdID,
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const GOFF::EDAttr &EDAttr, const GOFF::PRAttr &Attr)
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: Name(Name.data(), Name.size()), EsdId(EsdID), ParentEsdId(ParentEsdID),
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SymbolType(GOFF::ESD_ST_PartReference), NameSpace(EDAttr.NameSpace) {
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SymbolFlags.setRenameable(Attr.IsRenamable);
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BehavAttrs.setExecutable(Attr.Executable);
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BehavAttrs.setLinkageType(Attr.Linkage);
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BehavAttrs.setBindingScope(Attr.BindingScope);
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BehavAttrs.setAlignment(EDAttr.Alignment);
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}
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};
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class GOFFWriter {
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GOFFOstream OS;
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MCAssembler &Asm;
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void writeHeader();
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void writeSymbol(const GOFFSymbol &Symbol);
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void writeText(const MCSectionGOFF *MC);
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void writeEnd();
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void defineSectionSymbols(const MCSectionGOFF &Section);
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void defineLabel(const MCSymbolGOFF &Symbol);
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void defineSymbols();
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public:
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GOFFWriter(raw_pwrite_stream &OS, MCAssembler &Asm);
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uint64_t writeObject();
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};
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} // namespace
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GOFFWriter::GOFFWriter(raw_pwrite_stream &OS, MCAssembler &Asm)
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: OS(OS), Asm(Asm) {}
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void GOFFWriter::defineSectionSymbols(const MCSectionGOFF &Section) {
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if (Section.isSD()) {
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GOFFSymbol SD(Section.getName(), Section.getOrdinal(),
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Section.getSDAttributes());
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writeSymbol(SD);
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}
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if (Section.isED()) {
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GOFFSymbol ED(Section.getName(), Section.getOrdinal(),
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Section.getParent()->getOrdinal(), Section.getEDAttributes());
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ED.SectionLength = Asm.getSectionAddressSize(Section);
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writeSymbol(ED);
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}
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if (Section.isPR()) {
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MCSectionGOFF *Parent = Section.getParent();
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GOFFSymbol PR(Section.getName(), Section.getOrdinal(), Parent->getOrdinal(),
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Parent->getEDAttributes(), Section.getPRAttributes());
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PR.SectionLength = Asm.getSectionAddressSize(Section);
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if (Section.requiresNonZeroLength()) {
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// We cannot have a zero-length section for data. If we do,
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// artificially inflate it. Use 2 bytes to avoid odd alignments. Note:
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// if this is ever changed, you will need to update the code in
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// SystemZAsmPrinter::emitCEEMAIN and SystemZAsmPrinter::emitCELQMAIN to
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// generate -1 if there is no ADA
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if (!PR.SectionLength)
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PR.SectionLength = 2;
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}
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writeSymbol(PR);
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}
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}
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void GOFFWriter::defineLabel(const MCSymbolGOFF &Symbol) {
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MCSectionGOFF &Section = static_cast<MCSectionGOFF &>(Symbol.getSection());
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GOFFSymbol LD(Symbol.getName(), Symbol.getIndex(), Section.getOrdinal(),
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Section.getEDAttributes().NameSpace, Symbol.getLDAttributes());
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if (Symbol.getADA())
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LD.ADAEsdId = Symbol.getADA()->getOrdinal();
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writeSymbol(LD);
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}
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void GOFFWriter::defineSymbols() {
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unsigned Ordinal = 0;
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// Process all sections.
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for (MCSection &S : Asm) {
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auto &Section = static_cast<MCSectionGOFF &>(S);
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Section.setOrdinal(++Ordinal);
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defineSectionSymbols(Section);
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}
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// Process all symbols
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for (const MCSymbol &Sym : Asm.symbols()) {
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if (Sym.isTemporary())
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continue;
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auto &Symbol = static_cast<const MCSymbolGOFF &>(Sym);
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if (Symbol.hasLDAttributes()) {
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Symbol.setIndex(++Ordinal);
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defineLabel(Symbol);
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}
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}
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}
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void GOFFWriter::writeHeader() {
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OS.newRecord(GOFF::RT_HDR);
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OS.write_zeros(1); // Reserved
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OS.writebe<uint32_t>(0); // Target Hardware Environment
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OS.writebe<uint32_t>(0); // Target Operating System Environment
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OS.write_zeros(2); // Reserved
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OS.writebe<uint16_t>(0); // CCSID
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OS.write_zeros(16); // Character Set name
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OS.write_zeros(16); // Language Product Identifier
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OS.writebe<uint32_t>(1); // Architecture Level
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OS.writebe<uint16_t>(0); // Module Properties Length
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OS.write_zeros(6); // Reserved
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}
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void GOFFWriter::writeSymbol(const GOFFSymbol &Symbol) {
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if (Symbol.Offset >= (((uint64_t)1) << 31))
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report_fatal_error("ESD offset out of range");
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// All symbol names are in EBCDIC.
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SmallString<256> Name;
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ConverterEBCDIC::convertToEBCDIC(Symbol.Name, Name);
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// Check length here since this number is technically signed but we need uint
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// for writing to records.
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if (Name.size() >= GOFF::MaxDataLength)
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report_fatal_error("Symbol max name length exceeded");
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uint16_t NameLength = Name.size();
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OS.newRecord(GOFF::RT_ESD);
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OS.writebe<uint8_t>(Symbol.SymbolType); // Symbol Type
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OS.writebe<uint32_t>(Symbol.EsdId); // ESDID
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OS.writebe<uint32_t>(Symbol.ParentEsdId); // Parent or Owning ESDID
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OS.writebe<uint32_t>(0); // Reserved
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OS.writebe<uint32_t>(
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static_cast<uint32_t>(Symbol.Offset)); // Offset or Address
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OS.writebe<uint32_t>(0); // Reserved
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OS.writebe<uint32_t>(Symbol.SectionLength); // Length
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OS.writebe<uint32_t>(Symbol.EASectionEDEsdId); // Extended Attribute ESDID
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OS.writebe<uint32_t>(Symbol.EASectionOffset); // Extended Attribute Offset
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OS.writebe<uint32_t>(0); // Reserved
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OS.writebe<uint8_t>(Symbol.NameSpace); // Name Space ID
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OS.writebe<uint8_t>(Symbol.SymbolFlags); // Flags
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OS.writebe<uint8_t>(Symbol.FillByteValue); // Fill-Byte Value
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OS.writebe<uint8_t>(0); // Reserved
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OS.writebe<uint32_t>(Symbol.ADAEsdId); // ADA ESDID
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OS.writebe<uint32_t>(Symbol.SortKey); // Sort Priority
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OS.writebe<uint64_t>(0); // Reserved
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for (auto F : Symbol.BehavAttrs.Attr)
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OS.writebe<uint8_t>(F); // Behavioral Attributes
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OS.writebe<uint16_t>(NameLength); // Name Length
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OS.write(Name.data(), NameLength); // Name
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}
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namespace {
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/// Adapter stream to write a text section.
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class TextStream : public raw_ostream {
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/// The underlying GOFFOstream.
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GOFFOstream &OS;
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/// The buffer size is the maximum number of bytes in a TXT section.
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static constexpr size_t BufferSize = GOFF::MaxDataLength;
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/// Static allocated buffer for the stream, used by the raw_ostream class. The
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/// buffer is sized to hold the payload of a logical TXT record.
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char Buffer[BufferSize];
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/// The offset for the next TXT record. This is equal to the number of bytes
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/// written.
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size_t Offset;
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/// The Esdid of the GOFF section.
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const uint32_t EsdId;
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/// The record style.
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const GOFF::ESDTextStyle RecordStyle;
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/// See raw_ostream::write_impl.
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void write_impl(const char *Ptr, size_t Size) override;
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uint64_t current_pos() const override { return Offset; }
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public:
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explicit TextStream(GOFFOstream &OS, uint32_t EsdId,
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GOFF::ESDTextStyle RecordStyle)
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: OS(OS), Offset(0), EsdId(EsdId), RecordStyle(RecordStyle) {
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SetBuffer(Buffer, sizeof(Buffer));
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}
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~TextStream() { flush(); }
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};
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} // namespace
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void TextStream::write_impl(const char *Ptr, size_t Size) {
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size_t WrittenLength = 0;
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// We only have signed 32bits of offset.
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if (Offset + Size > std::numeric_limits<int32_t>::max())
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report_fatal_error("TXT section too large");
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while (WrittenLength < Size) {
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size_t ToWriteLength =
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std::min(Size - WrittenLength, size_t(GOFF::MaxDataLength));
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OS.newRecord(GOFF::RT_TXT);
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OS.writebe<uint8_t>(GOFF::Flags(4, 4, RecordStyle)); // Text Record Style
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OS.writebe<uint32_t>(EsdId); // Element ESDID
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OS.writebe<uint32_t>(0); // Reserved
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OS.writebe<uint32_t>(static_cast<uint32_t>(Offset)); // Offset
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OS.writebe<uint32_t>(0); // Text Field True Length
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OS.writebe<uint16_t>(0); // Text Encoding
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OS.writebe<uint16_t>(ToWriteLength); // Data Length
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OS.write(Ptr + WrittenLength, ToWriteLength); // Data
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WrittenLength += ToWriteLength;
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Offset += ToWriteLength;
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}
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}
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void GOFFWriter::writeText(const MCSectionGOFF *Section) {
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// A BSS section contains only zeros, no need to write this.
|
|
if (Section->isBSS())
|
|
return;
|
|
|
|
TextStream S(OS, Section->getOrdinal(), Section->getTextStyle());
|
|
Asm.writeSectionData(S, Section);
|
|
}
|
|
|
|
void GOFFWriter::writeEnd() {
|
|
uint8_t F = GOFF::END_EPR_None;
|
|
uint8_t AMODE = 0;
|
|
uint32_t ESDID = 0;
|
|
|
|
// TODO Set Flags/AMODE/ESDID for entry point.
|
|
|
|
OS.newRecord(GOFF::RT_END);
|
|
OS.writebe<uint8_t>(GOFF::Flags(6, 2, F)); // Indicator flags
|
|
OS.writebe<uint8_t>(AMODE); // AMODE
|
|
OS.write_zeros(3); // Reserved
|
|
// The record count is the number of logical records. In principle, this value
|
|
// is available as OS.logicalRecords(). However, some tools rely on this field
|
|
// being zero.
|
|
OS.writebe<uint32_t>(0); // Record Count
|
|
OS.writebe<uint32_t>(ESDID); // ESDID (of entry point)
|
|
}
|
|
|
|
uint64_t GOFFWriter::writeObject() {
|
|
writeHeader();
|
|
|
|
defineSymbols();
|
|
|
|
for (const MCSection &Section : Asm)
|
|
writeText(static_cast<const MCSectionGOFF *>(&Section));
|
|
|
|
writeEnd();
|
|
|
|
// Make sure all records are written.
|
|
OS.finalizeRecord();
|
|
|
|
LLVM_DEBUG(dbgs() << "Wrote " << OS.getNumLogicalRecords()
|
|
<< " logical records.");
|
|
|
|
return OS.getWrittenSize();
|
|
}
|
|
|
|
GOFFObjectWriter::GOFFObjectWriter(
|
|
std::unique_ptr<MCGOFFObjectTargetWriter> MOTW, raw_pwrite_stream &OS)
|
|
: TargetObjectWriter(std::move(MOTW)), OS(OS) {}
|
|
|
|
GOFFObjectWriter::~GOFFObjectWriter() {}
|
|
|
|
uint64_t GOFFObjectWriter::writeObject() {
|
|
uint64_t Size = GOFFWriter(OS, *Asm).writeObject();
|
|
return Size;
|
|
}
|
|
|
|
std::unique_ptr<MCObjectWriter>
|
|
llvm::createGOFFObjectWriter(std::unique_ptr<MCGOFFObjectTargetWriter> MOTW,
|
|
raw_pwrite_stream &OS) {
|
|
return std::make_unique<GOFFObjectWriter>(std::move(MOTW), OS);
|
|
}
|