Support for ELF Visibility
Emission for globals, using the correct data sections
Function alignment can be computed for each target using TargetELFWriterInfo
Some small fixes
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73201 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/ELF.h b/lib/CodeGen/ELF.h
index c22f6ed..79c6c8c 100644
--- a/lib/CodeGen/ELF.h
+++ b/lib/CodeGen/ELF.h
@@ -21,12 +21,12 @@
#ifndef CODEGEN_ELF_H
#define CODEGEN_ELF_H
+#include "llvm/GlobalVariable.h"
#include "llvm/CodeGen/MachineRelocation.h"
#include "llvm/Support/DataTypes.h"
#include <cstring>
namespace llvm {
- class GlobalVariable;
// Identification Indexes
enum {
@@ -100,18 +100,20 @@
/// table at the end of the file.
struct ELFSection {
+ // Name of the section
+ std::string Name;
+
// ELF specific fields
- std::string Name; // Name of the section.
- unsigned NameIdx; // Index in .shstrtab of name, once emitted.
- unsigned Type;
- unsigned Flags;
- uint64_t Addr;
- unsigned Offset;
- unsigned Size;
- unsigned Link;
- unsigned Info;
- unsigned Align;
- unsigned EntSize;
+ unsigned NameIdx; // sh_name - .shstrtab idx of name, once emitted.
+ unsigned Type; // sh_type - Section contents & semantics
+ unsigned Flags; // sh_flags - Section flags.
+ uint64_t Addr; // sh_addr - The mem addr this section is in.
+ unsigned Offset; // sh_offset - Offset from the file start
+ unsigned Size; // sh_size - The section size.
+ unsigned Link; // sh_link - Section header table index link.
+ unsigned Info; // sh_info - Auxillary information.
+ unsigned Align; // sh_addralign - Alignment of section.
+ unsigned EntSize; // sh_entsize - Size of entries in the section e
// Section Header Flags
enum {
@@ -207,9 +209,33 @@
STT_FILE = 4
};
+ enum {
+ STV_DEFAULT = 0, // Visibility is specified by binding type
+ STV_INTERNAL = 1, // Defined by processor supplements
+ STV_HIDDEN = 2, // Not visible to other components
+ STV_PROTECTED = 3 // Visible in other components but not preemptable
+ };
+
ELFSym(const GlobalValue *gv) : GV(gv), NameIdx(0), Value(0),
Size(0), Info(0), Other(0),
- SectionIdx(ELFSection::SHN_UNDEF) {}
+ SectionIdx(ELFSection::SHN_UNDEF) {
+ if (!GV)
+ return;
+
+ switch (GV->getVisibility()) {
+ default:
+ assert(0 && "unknown visibility type");
+ case GlobalValue::DefaultVisibility:
+ Other = STV_DEFAULT;
+ break;
+ case GlobalValue::HiddenVisibility:
+ Other = STV_HIDDEN;
+ break;
+ case GlobalValue::ProtectedVisibility:
+ Other = STV_PROTECTED;
+ break;
+ }
+ }
void SetBind(unsigned X) {
assert(X == (X & 0xF) && "Bind value out of range!");
@@ -219,6 +245,9 @@
assert(X == (X & 0xF) && "Type value out of range!");
Info = (Info & 0xF0) | X;
}
+
+ static unsigned getEntrySize(bool is64Bit)
+ { return is64Bit ? 24 : 16; }
};
} // end namespace llvm