dmd.backend.elfobj

Compiler implementation of the D programming language.

Members

Aliases

reltype_t alias reltype_t = uint: Correspondence of relocation types 386 32 bit in 64 64 in 64 R_386_32 R_X86_64_32 R_X86_64_64 R_386_GOTOFF R_X86_64_PC32 R_X86_64_ R_386_GOTPC R_X86_64_ R_X86_64_ R_386_GOT32 R_X86_64_ R_X86_64_ R_386_TLS_GD R_X86_64_TLSGD R_X86_64_ R_386_TLS_IE R_X86_64_GOTTPOFF R_X86_64_ R_386_TLS_LE R_X86_64_TPOFF32 R_X86_64_ R_386_PLT32 R_X86_64_PLT32 R_X86_64_ R_386_PC32 R_X86_64_PC32 R_X86_64_

Functions

Obj_addstr IDXSTR Obj_addstr(Outbuffer* strtab, const(char)* str): Output a string into a string table Input: strtab = string table for entry str = string to add
Obj_alias void Obj_alias(const(char)* n1, const(char)* n2): Output an alias definition record.
Obj_allowZeroSize bool Obj_allowZeroSize(): Do we allow zero sized objects?
Obj_byte void Obj_byte(int seg, targ_size_t offset, uint byte_): Output byte to object file.
Obj_bytes uint Obj_bytes(int seg, targ_size_t offset, uint nbytes, void* p): Output bytes to object file.
Obj_codeseg int Obj_codeseg(const char* name, int suffix): Define a new code segment. Input: name name of segment, if null then revert to default suffix 0 use name as is 1 append "_TEXT" to name Output: cseg segment index of new current code segment Offset(cseg) starting offset in cseg
Obj_common_block int Obj_common_block(Symbol* s, targ_size_t size, targ_size_t count): Output a common block definition. Input: p . external identifier size size in bytes of each elem count number of elems
Obj_compiler void Obj_compiler(): Embed compiler version in .obj file.
Obj_data_readonly int Obj_data_readonly(char* p, int len, int* pseg): Ouput read only data for data. Output: *pseg segment of that data
Obj_data_start int Obj_data_start(Symbol* sdata, targ_size_t datasize, int seg): Update data information about symbol align for output and assign segment if not already specified.
Obj_ehsections void Obj_ehsections(): Don't need to generate section brackets, use __start_SEC/__stop_SEC instead.
Obj_ehtables void Obj_ehtables(Symbol* sfunc, uint size, Symbol* ehsym): Stuff the following data in a separate segment: pointer to function pointer to ehsym length of function
Obj_exestr void Obj_exestr(const(char)* p): Embed string in executable.
Obj_export_symbol void Obj_export_symbol(Symbol* s, uint argsize): Export a function name.
Obj_external int Obj_external(Symbol* s): Output an external for existing symbol. Input: s Symbol to do EXTDEF on (Name is to be mangled)
Obj_external_def int Obj_external_def(const(char)* name): Output an external symbol for name. Input: name Name to do EXTDEF on (Not to be mangled)
Obj_far16thunk void Obj_far16thunk(Symbol* s): Generate far16 thunk. Input: s Symbol to generate a thunk for
Obj_fltused void Obj_fltused(): Mark object file as using floating point.
Obj_func_start void Obj_func_start(Symbol* sfunc): Update function info before codgen
Obj_func_term void Obj_func_term(Symbol* sfunc): Update function info after codgen
Obj_getsegment int Obj_getsegment(const(char)* name, const(char)* suffix, int type, int flags, int align_): Get corresponding seg_data entry for an existing or newly added section.
Obj_gotref void Obj_gotref(Symbol* s)
Obj_includelib bool Obj_includelib(const(char)* name): Output library name.
Obj_init Obj Obj_init(Outbuffer* objbuf, const(char)* filename, const(char)* csegname): Perform initialization that applies to all .o output files. Called before any other obj_xxx routines
Obj_initfile void Obj_initfile(const(char)* filename, const(char)* csegname, const(char)* modname): Initialize the start of object output for this particular .o file.
Obj_lidata void Obj_lidata(int seg, targ_size_t offset, targ_size_t count): Output an iterated data block of 0s.
Obj_linkerdirective bool Obj_linkerdirective(const(char)* name): Output linker directive.
Obj_linnum void Obj_linnum(Srcpos srcpos, int seg, targ_size_t offset): Record file and line number at segment and offset. The actual .debug_line segment is put out by dwarf_termfile().
Obj_moduleinfo void Obj_moduleinfo(Symbol* scc): Stuff pointer to ModuleInfo into its own section (minfo).
Obj_pubdef void Obj_pubdef(int seg, Symbol* s, targ_size_t offset): Output a public definition. Input: seg = segment index that symbol is defined in s . symbol offset = offset of name within segment
Obj_pubdefsize void Obj_pubdefsize(int seg, Symbol* s, targ_size_t offset, targ_size_t symsize): Output a public definition. Input: seg = segment index that symbol is defined in s . symbol offset = offset of name within segment symsize size of symbol
Obj_reftocodeseg void Obj_reftocodeseg(int seg, targ_size_t offset, targ_size_t val): Refer to address that is in the code segment. Only offsets are output, regardless of the memory model. Used to put values in switch address tables. Input: seg = where the address is going (CODE or DATA) offset = offset within seg val = displacement from start of this module
Obj_reftodatseg void Obj_reftodatseg(int seg, targ_size_t offset, targ_size_t val, uint targetdatum, int flags): Refer to address that is in the data segment. Input: seg = where the address is going offset = offset within seg val = displacement from address targetdatum = DATA, CDATA or UDATA, depending where the address is flags = CFoff, CFseg, CFoffset64, CFswitch
Obj_reftoident int Obj_reftoident(int seg, targ_size_t offset, Symbol* s, targ_size_t val, int flags): Refer to an identifier. Input: segtyp = where the address is going (CODE or DATA) offset = offset within seg s = Symbol table entry for identifier val = displacement from identifier flags = CFselfrel: self-relative CFseg: get segment CFoff: get offset CFoffset64: 64 bit fixup CFpc32: I64: PC relative 32 bit fixup
Obj_setModuleCtorDtor void Obj_setModuleCtorDtor(Symbol* sfunc, bool isCtor): Stuff pointer to function in its own segment. Used for static ctor and dtor lists.
Obj_setcodeseg void Obj_setcodeseg(int seg): Reset code seg to existing seg. Used after a COMDAT for a function is done.
Obj_startaddress void Obj_startaddress(Symbol* s): Set start address
Obj_staticctor void Obj_staticctor(Symbol* s, int, int): Symbol is the function that calls the static constructors. Put a pointer to it into a special segment that the startup code looks at. Input: s static constructor function dtor !=0 if leave space for static destructor seg 1: user 2: lib 3: compiler
Obj_staticdtor void Obj_staticdtor(Symbol* s): Symbol is the function that calls the static destructors. Put a pointer to it into a special segment that the exit code looks at. Input: s static destructor function
Obj_string_literal_segment int Obj_string_literal_segment(uint sz): Get segment for readonly string literals. The linker will pool strings in this section.
Obj_sym_cdata Symbol* Obj_sym_cdata(tym_t ty, char* p, int len): Ouput read only data and generate a symbol for it.
Obj_term void Obj_term(const(char)* objfilename): Terminate package.
Obj_termfile void Obj_termfile(): Fixup and terminate object file.
Obj_tlsseg seg_data* Obj_tlsseg(): Define segments for Thread Local Storage. Here's what the elf tls spec says: Field .tbss .tdata sh_name .tbss .tdata sh_type SHT_NOBITS SHT_PROGBITS sh_flags SHF_ALLOC|SHF_WRITE| SHF_ALLOC|SHF_WRITE| SHF_TLS SHF_TLS sh_addr virtual addr of section virtual addr of section sh_offset 0 file offset of initialization image sh_size size of section size of section sh_link SHN_UNDEF SHN_UNDEF sh_info 0 0 sh_addralign alignment of section alignment of section sh_entsize 0 0 We want _tlsstart and _tlsend to bracket all the D tls data. The default linker script (ld -verbose) says: .tdata : { *(.tdata .tdata.* .gnu.linkonce.td.*) } .tbss : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) } so if we assign names: _tlsstart .tdata symbols .tdata. symbols .tbss _tlsend .tbss. this should work. Don't care about sections emitted by other languages, as we presume they won't be storing D gc roots in their tls. Output: seg_tlsseg set to segment number for TLS segment.
Obj_tlsseg_bss seg_data* Obj_tlsseg_bss(): Define segments for Thread Local Storage. Output: seg_tlsseg_bss set to segment number for TLS segment.
Obj_user void Obj_user(const(char)* p): Embed string in obj.
Obj_wkext void Obj_wkext(Symbol* s1, Symbol* s2): Output a weak extern record.
Obj_write_byte void Obj_write_byte(seg_data* pseg, uint byte_): Append byte to segment.
Obj_write_bytes void Obj_write_bytes(seg_data* pseg, uint nbytes, void* p): Append bytes to segment.
Obj_write_zeros void Obj_write_zeros(seg_data* pseg, targ_size_t count): Append an iterated data block of 0s. (uninitialized data only)
Obj_writerel size_t Obj_writerel(int targseg, size_t offset, reltype_t reltype, IDXSYM symidx, targ_size_t val): Write/Append a relocatable value to the given segment and offset. Input: targseg = the target segment for the relocation offset = offset within target segment reltype = ELF relocation type R_ARCH_XXXX symidx = symbol base for relocation val = addend or displacement from symbol
addSegmentToComdat void addSegmentToComdat(segidx_t seg, segidx_t comdatseg)
dwarf_reftoident int dwarf_reftoident(int seg, targ_size_t offset, Symbol* s, targ_size_t val): Generate fixup specific to .eh_frame and .gcc_except_table sections.
elf_align int elf_align(targ_size_t size, int foffset): Write to the object file
elf_renumbersyms void* elf_renumbersyms(): Renumber symbols so they are ordered as locals, weak and then global
obj_filename void obj_filename(const(char)* modname): Output file name record.
obj_mangle2 char* obj_mangle2(Symbol* s, char* dest, size_t* destlen): Mangle a name.
objfile_delete void objfile_delete(): Close and delete .OBJ file.
objfile_term void objfile_term(): Terminate.

Manifest constants

DMDV2 enum DMDV2;: If set the compiler requires full druntime support of the new section registration.
ELF_COMDAT enum ELF_COMDAT;: FreeBSD uses ELF, but the linker crashes with Elf comdats with the following message: /usr/bin/ld: BFD 2.15 FreeBSD 2004-05-23 internal error, aborting at /usr/src/gnu/usr.bin/binutils/libbfd/../../../../contrib/binutils/bfd/elfcode.h line 213 in bfd_elf32_swap_symbol_out For the time being, just stick with Linux.
USE_INIT_ARRAY enum USE_INIT_ARRAY;: If set, produce .init_array/.fini_array instead of legacy .ctors/.dtors . OpenBSD added the support in Aug 2016. Other supported platforms has supported .init_array for years.

Static variables

relcnt int relcnt;: Output a relocation entry for a segment Input: seg = where the address is going offset = offset within seg type = ELF relocation type R_ARCH_XXXX index = Related symbol table index val = addend or displacement from address

dmd.backend.elfobj

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