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216 lines
8.5 KiB
C++
216 lines
8.5 KiB
C++
//===-- llvm/Bitcode/ReaderWriter.h - Bitcode reader/writers ----*- C++ -*-===//
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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 header defines interfaces to read and write LLVM bitcode files/streams.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_BITCODE_READERWRITER_H
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#define LLVM_BITCODE_READERWRITER_H
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#include "llvm/IR/DiagnosticInfo.h"
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#include "llvm/IR/ModuleSummaryIndex.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/ErrorOr.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include <memory>
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#include <string>
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namespace llvm {
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class BitstreamWriter;
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class DataStreamer;
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class LLVMContext;
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class Module;
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class ModulePass;
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class raw_ostream;
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/// Offsets of the 32-bit fields of bitcode wrapper header.
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static const unsigned BWH_MagicField = 0*4;
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static const unsigned BWH_VersionField = 1*4;
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static const unsigned BWH_OffsetField = 2*4;
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static const unsigned BWH_SizeField = 3*4;
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static const unsigned BWH_CPUTypeField = 4*4;
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static const unsigned BWH_HeaderSize = 5*4;
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/// Read the header of the specified bitcode buffer and prepare for lazy
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/// deserialization of function bodies. If ShouldLazyLoadMetadata is true,
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/// lazily load metadata as well. If successful, this moves Buffer. On
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/// error, this *does not* move Buffer.
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ErrorOr<std::unique_ptr<Module>>
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getLazyBitcodeModule(std::unique_ptr<MemoryBuffer> &&Buffer,
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LLVMContext &Context,
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bool ShouldLazyLoadMetadata = false);
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/// Read the header of the specified stream and prepare for lazy
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/// deserialization and streaming of function bodies.
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ErrorOr<std::unique_ptr<Module>>
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getStreamedBitcodeModule(StringRef Name,
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std::unique_ptr<DataStreamer> Streamer,
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LLVMContext &Context);
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/// Read the header of the specified bitcode buffer and extract just the
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/// triple information. If successful, this returns a string. On error, this
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/// returns "".
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std::string getBitcodeTargetTriple(MemoryBufferRef Buffer,
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LLVMContext &Context);
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/// Return true if \p Buffer contains a bitcode file with ObjC code (category
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/// or class) in it.
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bool isBitcodeContainingObjCCategory(MemoryBufferRef Buffer,
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LLVMContext &Context);
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/// Read the header of the specified bitcode buffer and extract just the
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/// producer string information. If successful, this returns a string. On
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/// error, this returns "".
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std::string getBitcodeProducerString(MemoryBufferRef Buffer,
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LLVMContext &Context);
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/// Read the specified bitcode file, returning the module.
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ErrorOr<std::unique_ptr<Module>> parseBitcodeFile(MemoryBufferRef Buffer,
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LLVMContext &Context);
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/// Check if the given bitcode buffer contains a summary block.
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bool
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hasGlobalValueSummary(MemoryBufferRef Buffer,
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const DiagnosticHandlerFunction &DiagnosticHandler);
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/// Parse the specified bitcode buffer, returning the module summary index.
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ErrorOr<std::unique_ptr<ModuleSummaryIndex>>
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getModuleSummaryIndex(MemoryBufferRef Buffer,
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const DiagnosticHandlerFunction &DiagnosticHandler);
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/// \brief Write the specified module to the specified raw output stream.
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///
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/// For streams where it matters, the given stream should be in "binary"
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/// mode.
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///
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/// If \c ShouldPreserveUseListOrder, encode the use-list order for each \a
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/// Value in \c M. These will be reconstructed exactly when \a M is
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/// deserialized.
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///
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/// If \c Index is supplied, the bitcode will contain the summary index
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/// (currently for use in ThinLTO optimization).
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///
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/// \p GenerateHash enables hashing the Module and including the hash in the
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/// bitcode (currently for use in ThinLTO incremental build).
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void WriteBitcodeToFile(const Module *M, raw_ostream &Out,
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bool ShouldPreserveUseListOrder = false,
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const ModuleSummaryIndex *Index = nullptr,
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bool GenerateHash = false);
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/// Write the specified module summary index to the given raw output stream,
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/// where it will be written in a new bitcode block. This is used when
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/// writing the combined index file for ThinLTO. When writing a subset of the
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/// index for a distributed backend, provide the \p ModuleToSummariesForIndex
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/// map.
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void WriteIndexToFile(const ModuleSummaryIndex &Index, raw_ostream &Out,
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std::map<std::string, GVSummaryMapTy>
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*ModuleToSummariesForIndex = nullptr);
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/// isBitcodeWrapper - Return true if the given bytes are the magic bytes
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/// for an LLVM IR bitcode wrapper.
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///
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inline bool isBitcodeWrapper(const unsigned char *BufPtr,
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const unsigned char *BufEnd) {
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// See if you can find the hidden message in the magic bytes :-).
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// (Hint: it's a little-endian encoding.)
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return BufPtr != BufEnd &&
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BufPtr[0] == 0xDE &&
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BufPtr[1] == 0xC0 &&
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BufPtr[2] == 0x17 &&
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BufPtr[3] == 0x0B;
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}
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/// isRawBitcode - Return true if the given bytes are the magic bytes for
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/// raw LLVM IR bitcode (without a wrapper).
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///
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inline bool isRawBitcode(const unsigned char *BufPtr,
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const unsigned char *BufEnd) {
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// These bytes sort of have a hidden message, but it's not in
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// little-endian this time, and it's a little redundant.
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return BufPtr != BufEnd &&
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BufPtr[0] == 'B' &&
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BufPtr[1] == 'C' &&
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BufPtr[2] == 0xc0 &&
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BufPtr[3] == 0xde;
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}
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/// isBitcode - Return true if the given bytes are the magic bytes for
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/// LLVM IR bitcode, either with or without a wrapper.
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///
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inline bool isBitcode(const unsigned char *BufPtr,
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const unsigned char *BufEnd) {
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return isBitcodeWrapper(BufPtr, BufEnd) ||
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isRawBitcode(BufPtr, BufEnd);
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}
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/// SkipBitcodeWrapperHeader - Some systems wrap bc files with a special
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/// header for padding or other reasons. The format of this header is:
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///
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/// struct bc_header {
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/// uint32_t Magic; // 0x0B17C0DE
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/// uint32_t Version; // Version, currently always 0.
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/// uint32_t BitcodeOffset; // Offset to traditional bitcode file.
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/// uint32_t BitcodeSize; // Size of traditional bitcode file.
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/// ... potentially other gunk ...
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/// };
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///
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/// This function is called when we find a file with a matching magic number.
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/// In this case, skip down to the subsection of the file that is actually a
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/// BC file.
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/// If 'VerifyBufferSize' is true, check that the buffer is large enough to
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/// contain the whole bitcode file.
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inline bool SkipBitcodeWrapperHeader(const unsigned char *&BufPtr,
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const unsigned char *&BufEnd,
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bool VerifyBufferSize) {
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// Must contain the offset and size field!
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if (unsigned(BufEnd - BufPtr) < BWH_SizeField + 4)
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return true;
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unsigned Offset = support::endian::read32le(&BufPtr[BWH_OffsetField]);
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unsigned Size = support::endian::read32le(&BufPtr[BWH_SizeField]);
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uint64_t BitcodeOffsetEnd = (uint64_t)Offset + (uint64_t)Size;
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// Verify that Offset+Size fits in the file.
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if (VerifyBufferSize && BitcodeOffsetEnd > uint64_t(BufEnd-BufPtr))
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return true;
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BufPtr += Offset;
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BufEnd = BufPtr+Size;
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return false;
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}
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const std::error_category &BitcodeErrorCategory();
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enum class BitcodeError { InvalidBitcodeSignature = 1, CorruptedBitcode };
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inline std::error_code make_error_code(BitcodeError E) {
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return std::error_code(static_cast<int>(E), BitcodeErrorCategory());
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}
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class BitcodeDiagnosticInfo : public DiagnosticInfo {
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const Twine &Msg;
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std::error_code EC;
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public:
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BitcodeDiagnosticInfo(std::error_code EC, DiagnosticSeverity Severity,
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const Twine &Msg);
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void print(DiagnosticPrinter &DP) const override;
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std::error_code getError() const { return EC; }
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static bool classof(const DiagnosticInfo *DI) {
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return DI->getKind() == DK_Bitcode;
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}
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};
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} // End llvm namespace
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namespace std {
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template <> struct is_error_code_enum<llvm::BitcodeError> : std::true_type {};
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}
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#endif
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