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Add support for building/representing the symbol table, add some enum constants

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llvm-svn: 22342
This commit is contained in:
Chris Lattner 2005-07-07 07:00:37 +00:00
parent 667588d524
commit ad1e2361e9
1 changed files with 56 additions and 7 deletions
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63
include/llvm/CodeGen/ELFWriter.h
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@ -86,10 +86,14 @@ namespace llvm {
unsigned Info;
unsigned Align;
unsigned EntSize;
ELFSection() : Type(0), Flags(0), Addr(0), Offset(0), Size(0), Link(0),
Info(0), Align(0), EntSize(0) {
}
ELFSection(const char *name, unsigned offset)
enum { SHT_NULL = 0, SHT_PROGBITS = 1, SHT_SYMTAB = 2, SHT_STRTAB = 3,
SHT_RELA = 4, SHT_HASH = 5, SHT_DYNAMIC = 6, SHT_NOTE = 7,
SHT_NOBITS = 8, SHT_REL = 9, SHT_SHLIB = 10, SHT_DYNSYM = 11 };
enum { SHN_UNDEF = 0, SHN_ABS = 0xFFF1, SHN_COMMON = 0xFFF2 };
enum { SHF_WRITE = 1, SHF_ALLOC = 2, SHF_EXECINSTR = 4 };
ELFSection(const char *name = "", unsigned offset = 0)
: Name(name), Type(0), Flags(0), Addr(0), Offset(offset), Size(0),
Link(0), Info(0), Align(0), EntSize(0) {
}
@ -100,6 +104,41 @@ namespace llvm {
/// is constructed from this info.
std::vector<ELFSection> SectionList;
/// ELFSym - This struct contains information about each symbol that is
/// added to logical symbol table for the module. This is eventually
/// turned into a real symbol table in the file.
struct ELFSym {
GlobalValue *GV; // The global value this corresponds to.
//std::string Name; // Name of the symbol.
unsigned NameIdx; // Index in .strtab of name, once emitted.
uint64_t Value;
unsigned Size;
unsigned char Info;
unsigned char Other;
unsigned short SectionIdx;
enum { STB_LOCAL = 0, STB_GLOBAL = 1, STB_WEAK = 2 };
enum { STT_NOTYPE = 0, STT_OBJECT = 1, STT_FUNC = 2, STT_SECTION = 3,
STT_FILE = 4 };
ELFSym(GlobalValue *gv) : GV(gv), Value(0), Size(0), Info(0),
Other(0), SectionIdx(0) {}
void SetBind(unsigned X) {
assert(X == (X & 0xF) && "Bind value out of range!");
Info = (Info & 0x0F) | (X << 4);
}
void SetType(unsigned X) {
assert(X == (X & 0xF) && "Type value out of range!");
Info = (Info & 0xF0) | X;
}
};
/// SymbolTable - This is the list of symbols we have emitted to the file.
/// This actually gets rearranged before emission to OutputBuffer (to put
/// the local symbols first in the list).
std::vector<ELFSym> SymbolTable;
// As we accumulate the ELF file into OutputBuffer, we occasionally need to
// keep track of locations to update later (e.g. the location of the section
// table in the ELF header. These members keep track of the offset in
@ -109,6 +148,15 @@ namespace llvm {
unsigned ELFHeader_e_shstrndx_Offset; // e_shstrndx in ELF header.
unsigned ELFHeader_e_shnum_Offset; // e_shnum in ELF header.
// align - Emit padding into the file until the current output position is
// aligned to the specified power of two boundary.
void align(unsigned Boundary) {
assert(Boundary && (Boundary & (Boundary-1)) == 0 &&
"Must align to 2^k boundary");
while (OutputBuffer.size() & (Boundary-1))
outbyte(0xAB);
}
void outbyte(unsigned char X) { OutputBuffer.push_back(X); }
void outhalf(unsigned short X) {
if (isLittleEndian) {
@ -162,9 +210,10 @@ namespace llvm {
}
private:
void EmitDATASectionGlobal(GlobalVariable *GV);
void EmitBSSSectionGlobal(GlobalVariable *GV);
void EmitGlobal(GlobalVariable *GV);
void EmitGlobal(GlobalVariable *GV, ELFSection &DataSection,
ELFSection &BSSSection);
void EmitSymbolTable();
void EmitSectionTableStringTable();
void EmitSectionTable();