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src/IceELFObjectWriter.h

 //===- subzero/src/IceELFObjectWriter.h - ELF object writer -----*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
 /// Abstraction for a writer that is responsible for writing an ELF file.
 ///
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICEELFOBJECTWRITER_H
 #define SUBZERO_SRC_ICEELFOBJECTWRITER_H
 
 #include "IceDefs.h"
 #include "IceELFSection.h"
 #include "IceELFStreamer.h"
 #include "IceTypes.h"
 
 using namespace llvm::ELF;
 
 namespace Ice {
 
-/// Higher level ELF object writer.  Manages section information and writes
-/// the final ELF object.  The object writer will write to file the code
-/// and data as it is being defined (rather than keep a copy).
-/// After all definitions are written out, it will finalize the bookkeeping
-/// sections and write them out.  Expected usage:
+/// Higher level ELF object writer. Manages section information and writes the
+/// final ELF object. The object writer will write to file the code and data as
+/// it is being defined (rather than keep a copy). After all definitions are
+/// written out, it will finalize the bookkeeping sections and write them out.
+/// Expected usage:
 ///
 /// (1) writeInitialELFHeader (invoke once)
 /// (2) writeDataSection      (may be invoked multiple times, as long as
 ///                            SectionSuffix is unique)
 /// (3) writeFunctionCode     (must invoke once per function)
 /// (4) writeConstantPool     (must invoke once per pooled primitive type)
 /// (5) setUndefinedSyms      (invoke once)
 /// (6) writeNonUserSections  (invoke once)
 ///
-/// The requirement for writeDataSection to be invoked only once can
-/// be relaxed if using -fdata-sections. The requirement to invoke only once
-/// without -fdata-sections is so that variables that belong to each possible
+/// The requirement for writeDataSection to be invoked only once can be relaxed
+/// if using -fdata-sections. The requirement to invoke only once without
+/// -fdata-sections is so that variables that belong to each possible
 /// SectionType are contiguous in the file. With -fdata-sections, each global
 /// variable is in a separate section and therefore the sections will be
 /// trivially contiguous.
 class ELFObjectWriter {
   ELFObjectWriter() = delete;
   ELFObjectWriter(const ELFObjectWriter &) = delete;
   ELFObjectWriter &operator=(const ELFObjectWriter &) = delete;
 
 public:
   ELFObjectWriter(GlobalContext &Ctx, ELFStreamer &Out);
 
   /// Write the initial ELF header. This is just to reserve space in the ELF
-  /// file. Reserving space allows the other functions to write text
-  /// and data directly to the file and get the right file offsets.
+  /// file. Reserving space allows the other functions to write text and data
+  /// directly to the file and get the right file offsets.
   void writeInitialELFHeader();
 
-  /// Copy initializer data for globals to file and note the offset and size
-  /// of each global's definition in the symbol table.
-  /// Use the given target's RelocationKind for any relocations.
+  /// Copy initializer data for globals to file and note the offset and size of
+  /// each global's definition in the symbol table. Use the given target's
+  /// RelocationKind for any relocations.
   void writeDataSection(const VariableDeclarationList &Vars,
                         FixupKind RelocationKind,
                         const IceString &SectionSuffix);
 
   /// Copy data of a function's text section to file and note the offset of the
-  /// symbol's definition in the symbol table.
-  /// Copy the text fixups for use after all functions are written.
-  /// The text buffer and fixups are extracted from the Assembler object.
+  /// symbol's definition in the symbol table. Copy the text fixups for use
+  /// after all functions are written. The text buffer and fixups are extracted
+  /// from the Assembler object.
   void writeFunctionCode(const IceString &FuncName, bool IsInternal,
                          const Assembler *Asm);
 
-  /// Queries the GlobalContext for constant pools of the given type
-  /// and writes out read-only data sections for those constants. This also
-  /// fills the symbol table with labels for each constant pool entry.
+  /// Queries the GlobalContext for constant pools of the given type and writes
+  /// out read-only data sections for those constants. This also fills the
+  /// symbol table with labels for each constant pool entry.
   template <typename ConstType> void writeConstantPool(Type Ty);
 
   /// Write a jump table and register fixups for the target addresses.
   void writeJumpTable(const JumpTableData &JT, FixupKind RelocationKind);
 
   /// Populate the symbol table with a list of external/undefined symbols.
   void setUndefinedSyms(const ConstantList &UndefSyms);
 
-  /// Do final layout and write out the rest of the object file.
-  /// Finally, patch up the initial ELF header with the final info.
+  /// Do final layout and write out the rest of the object file. Finally, patch
+  /// up the initial ELF header with the final info.
   void writeNonUserSections();
 
-  /// Which type of ELF section a global variable initializer belongs to.
-  /// This is used as an array index so should start at 0 and be contiguous.
+  /// Which type of ELF section a global variable initializer belongs to. This
+  /// is used as an array index so should start at 0 and be contiguous.
   enum SectionType { ROData = 0, Data, BSS, NumSectionTypes };
 
 private:
   GlobalContext &Ctx;
   ELFStreamer &Str;
   bool SectionNumbersAssigned = false;
   bool ELF64;
 
   // All created sections, separated into different pools.
   using SectionList = std::vector<ELFSection *>;
@@ skipping 12 matching lines @@
   ELFSection *NullSection;
   ELFStringTableSection *ShStrTab;
   ELFSymbolTableSection *SymTab;
   ELFStringTableSection *StrTab;
 
   template <typename T>
   T *createSection(const IceString &Name, Elf64_Word ShType,
                    Elf64_Xword ShFlags, Elf64_Xword ShAddralign,
                    Elf64_Xword ShEntsize);
 
-  /// Create a relocation section, given the related section
-  /// (e.g., .text, .data., .rodata).
+  /// Create a relocation section, given the related section (e.g., .text,
+  /// .data., .rodata).
   ELFRelocationSection *
   createRelocationSection(const ELFSection *RelatedSection);
 
-  /// Align the file position before writing out a section's data,
-  /// and return the position of the file.
+  /// Align the file position before writing out a section's data, and return
+  /// the position of the file.
   Elf64_Off alignFileOffset(Elf64_Xword Align);
 
-  /// Assign an ordering / section numbers to each section.
-  /// Fill in other information that is only known near the end
-  /// (such as the size, if it wasn't already incrementally updated).
-  /// This then collects all sections in the decided order, into one vector,
-  /// for conveniently writing out all of the section headers.
+  /// Assign an ordering / section numbers to each section. Fill in other
+  /// information that is only known near the end (such as the size, if it
+  /// wasn't already incrementally updated). This then collects all sections in
+  /// the decided order, into one vector, for conveniently writing out all of
+  /// the section headers.
   void assignSectionNumbersInfo(SectionList &AllSections);
 
-  /// This function assigns .foo and .rel.foo consecutive section numbers.
-  /// It also sets the relocation section's sh_info field to the related
-  /// section's number.
+  /// This function assigns .foo and .rel.foo consecutive section numbers. It
+  /// also sets the relocation section's sh_info field to the related section's
+  /// number.
   template <typename UserSectionList>
   void assignRelSectionNumInPairs(SizeT &CurSectionNumber,
                                   UserSectionList &UserSections,
                                   RelSectionList &RelSections,
                                   SectionList &AllSections);
 
   /// Link the relocation sections to the symbol table.
   void assignRelLinkNum(SizeT SymTabNumber, RelSectionList &RelSections);
 
   /// Helper function for writeDataSection. Writes a data section of type
   /// SectionType, given the global variables Vars belonging to that
   /// SectionType.
   void writeDataOfType(SectionType SectionType,
                        const VariableDeclarationList &Vars,
                        FixupKind RelocationKind,
                        const IceString &SectionSuffix);
 
-  /// Write the final relocation sections given the final symbol table.
-  /// May also be able to seek around the file and resolve function calls
-  /// that are for functions within the same section.
+  /// Write the final relocation sections given the final symbol table. May also
+  /// be able to seek around the file and resolve function calls that are for
+  /// functions within the same section.
   void writeAllRelocationSections();
   void writeRelocationSections(RelSectionList &RelSections);
 
   /// Write the ELF file header with the given information about sections.
   template <bool IsELF64>
   void writeELFHeaderInternal(Elf64_Off SectionHeaderOffset,
                               SizeT SectHeaderStrIndex, SizeT NumSections);
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEELFOBJECTWRITER_H