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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
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@ -14,6 +14,10 @@
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#ifndef LLVM_TARGET_TARGETELFWRITERINFO_H
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#ifndef LLVM_TARGET_TARGETELFWRITERINFO_H
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#define LLVM_TARGET_TARGETELFWRITERINFO_H
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#define LLVM_TARGET_TARGETELFWRITERINFO_H
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Function.h"
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namespace llvm {
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namespace llvm {
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//===--------------------------------------------------------------------===//
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//===--------------------------------------------------------------------===//
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@ -21,9 +25,11 @@ namespace llvm {
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//===--------------------------------------------------------------------===//
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//===--------------------------------------------------------------------===//
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class TargetELFWriterInfo {
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class TargetELFWriterInfo {
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protected:
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// EMachine - This field is the target specific value to emit as the
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// EMachine - This field is the target specific value to emit as the
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// e_machine member of the ELF header.
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// e_machine member of the ELF header.
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unsigned short EMachine;
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unsigned short EMachine;
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TargetMachine &TM;
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public:
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public:
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// Machine architectures
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// Machine architectures
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@ -44,10 +50,21 @@ namespace llvm {
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EM_X86_64 = 62 // AMD64
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EM_X86_64 = 62 // AMD64
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};
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};
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explicit TargetELFWriterInfo(MachineType machine) : EMachine(machine) {}
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explicit TargetELFWriterInfo(TargetMachine &tm) : TM(tm) {}
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virtual ~TargetELFWriterInfo() {}
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virtual ~TargetELFWriterInfo() {}
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unsigned short getEMachine() const { return EMachine; }
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unsigned short getEMachine() const { return EMachine; }
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/// getFunctionAlignment - Returns the alignment for function 'F', targets
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/// with different alignment constraints should overload this method
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virtual unsigned getFunctionAlignment(const Function *F) const {
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const TargetData *TD = TM.getTargetData();
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unsigned FnAlign = F->getAlignment();
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unsigned TDAlign = TD->getPointerABIAlignment();
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unsigned Align = std::max(FnAlign, TDAlign);
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assert(!(Align & (Align-1)) && "Alignment is not a power of two!");
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return Align;
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}
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};
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};
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} // end llvm namespace
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} // end llvm namespace
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@ -21,12 +21,12 @@
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#ifndef CODEGEN_ELF_H
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#ifndef CODEGEN_ELF_H
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#define CODEGEN_ELF_H
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#define CODEGEN_ELF_H
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#include "llvm/GlobalVariable.h"
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#include "llvm/CodeGen/MachineRelocation.h"
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#include "llvm/CodeGen/MachineRelocation.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/DataTypes.h"
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#include <cstring>
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#include <cstring>
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namespace llvm {
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namespace llvm {
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class GlobalVariable;
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// Identification Indexes
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// Identification Indexes
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enum {
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enum {
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@ -100,18 +100,20 @@ namespace llvm {
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/// table at the end of the file.
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/// table at the end of the file.
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struct ELFSection {
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struct ELFSection {
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// Name of the section
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std::string Name;
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// ELF specific fields
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// ELF specific fields
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std::string Name; // Name of the section.
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unsigned NameIdx; // sh_name - .shstrtab idx of name, once emitted.
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unsigned NameIdx; // Index in .shstrtab of name, once emitted.
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unsigned Type; // sh_type - Section contents & semantics
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unsigned Type;
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unsigned Flags; // sh_flags - Section flags.
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unsigned Flags;
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uint64_t Addr; // sh_addr - The mem addr this section is in.
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uint64_t Addr;
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unsigned Offset; // sh_offset - Offset from the file start
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unsigned Offset;
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unsigned Size; // sh_size - The section size.
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unsigned Size;
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unsigned Link; // sh_link - Section header table index link.
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unsigned Link;
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unsigned Info; // sh_info - Auxillary information.
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unsigned Info;
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unsigned Align; // sh_addralign - Alignment of section.
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unsigned Align;
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unsigned EntSize; // sh_entsize - Size of entries in the section e
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unsigned EntSize;
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// Section Header Flags
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// Section Header Flags
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enum {
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enum {
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@ -207,9 +209,33 @@ namespace llvm {
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STT_FILE = 4
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STT_FILE = 4
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};
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};
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enum {
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STV_DEFAULT = 0, // Visibility is specified by binding type
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STV_INTERNAL = 1, // Defined by processor supplements
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STV_HIDDEN = 2, // Not visible to other components
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STV_PROTECTED = 3 // Visible in other components but not preemptable
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};
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ELFSym(const GlobalValue *gv) : GV(gv), NameIdx(0), Value(0),
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ELFSym(const GlobalValue *gv) : GV(gv), NameIdx(0), Value(0),
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Size(0), Info(0), Other(0),
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Size(0), Info(0), Other(0),
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SectionIdx(ELFSection::SHN_UNDEF) {}
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SectionIdx(ELFSection::SHN_UNDEF) {
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if (!GV)
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return;
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switch (GV->getVisibility()) {
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default:
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assert(0 && "unknown visibility type");
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case GlobalValue::DefaultVisibility:
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Other = STV_DEFAULT;
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break;
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case GlobalValue::HiddenVisibility:
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Other = STV_HIDDEN;
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break;
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case GlobalValue::ProtectedVisibility:
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Other = STV_PROTECTED;
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break;
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}
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}
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void SetBind(unsigned X) {
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void SetBind(unsigned X) {
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assert(X == (X & 0xF) && "Bind value out of range!");
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assert(X == (X & 0xF) && "Bind value out of range!");
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@ -219,6 +245,9 @@ namespace llvm {
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assert(X == (X & 0xF) && "Type value out of range!");
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assert(X == (X & 0xF) && "Type value out of range!");
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Info = (Info & 0xF0) | X;
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Info = (Info & 0xF0) | X;
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}
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}
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static unsigned getEntrySize(bool is64Bit)
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{ return is64Bit ? 24 : 16; }
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};
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};
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} // end namespace llvm
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} // end namespace llvm
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@ -15,7 +15,6 @@
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#include "llvm/Function.h"
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#include "llvm/Function.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineJumpTableInfo.h"
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#include "llvm/CodeGen/MachineJumpTableInfo.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Debug.h"
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/// startFunction - This callback is invoked when a new machine function is
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/// startFunction - This callback is invoked when a new machine function is
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/// about to be emitted.
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/// about to be emitted.
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void ELFCodeEmitter::startFunction(MachineFunction &MF) {
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void ELFCodeEmitter::startFunction(MachineFunction &MF) {
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const TargetData *TD = TM.getTargetData();
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const Function *F = MF.getFunction();
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// Align the output buffer to the appropriate alignment, power of 2.
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unsigned FnAlign = F->getAlignment();
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unsigned TDAlign = TD->getPrefTypeAlignment(F->getType());
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unsigned Align = std::max(FnAlign, TDAlign);
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assert(!(Align & (Align-1)) && "Alignment is not a power of two!");
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// Get the ELF Section that this function belongs in.
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// Get the ELF Section that this function belongs in.
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ES = &EW.getTextSection();
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ES = &EW.getTextSection();
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DOUT << "processing function: " << MF.getFunction()->getName() << "\n";
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// FIXME: better memory management, this will be replaced by BinaryObjects
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// FIXME: better memory management, this will be replaced by BinaryObjects
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ES->SectionData.reserve(4096);
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ES->SectionData.reserve(4096);
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BufferBegin = &ES->SectionData[0];
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BufferBegin = &ES->SectionData[0];
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BufferEnd = BufferBegin + ES->SectionData.capacity();
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BufferEnd = BufferBegin + ES->SectionData.capacity();
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// Upgrade the section alignment if required.
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// Align the output buffer with function alignment, and
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// upgrade the section alignment if required
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unsigned Align =
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TM.getELFWriterInfo()->getFunctionAlignment(MF.getFunction());
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if (ES->Align < Align) ES->Align = Align;
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if (ES->Align < Align) ES->Align = Align;
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// Round the size up to the correct alignment for starting the new function.
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ES->Size = (ES->Size + (Align-1)) & (-Align);
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ES->Size = (ES->Size + (Align-1)) & (-Align);
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// Snaity check on allocated space for text section
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// Snaity check on allocated space for text section
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// ...
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// ...
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// #N. ".shstrtab" entry - String table for the section names.
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// #N. ".shstrtab" entry - String table for the section names.
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//
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//
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// NOTE: This code should eventually be extended to support 64-bit ELF (this
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// won't be hard), but we haven't done so yet!
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//
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "elfwriter"
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#define DEBUG_TYPE "elfwriter"
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#include "ELFWriter.h"
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#include "ELFWriter.h"
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#include "ELFCodeEmitter.h"
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#include "ELFCodeEmitter.h"
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#include "ELF.h"
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#include "ELF.h"
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#include "llvm/Constants.h"
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#include "llvm/Module.h"
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/PassManager.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetELFWriterInfo.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/Support/OutputBuffer.h"
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#include "llvm/Support/Streams.h"
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#include "llvm/Support/Streams.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Debug.h"
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@ -76,6 +72,7 @@ ELFWriter::ELFWriter(raw_ostream &o, TargetMachine &tm)
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ElfHdr = new ELFHeader(TM.getELFWriterInfo()->getEMachine(), 0,
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ElfHdr = new ELFHeader(TM.getELFWriterInfo()->getEMachine(), 0,
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is64Bit, isLittleEndian);
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is64Bit, isLittleEndian);
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TAI = TM.getTargetAsmInfo();
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// Create the machine code emitter object for this target.
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// Create the machine code emitter object for this target.
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MCE = new ELFCodeEmitter(*this);
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MCE = new ELFCodeEmitter(*this);
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@ -152,6 +149,11 @@ bool ELFWriter::doInitialization(Module &M) {
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}
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}
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void ELFWriter::EmitGlobal(GlobalVariable *GV) {
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void ELFWriter::EmitGlobal(GlobalVariable *GV) {
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// XXX: put local symbols *before* global ones!
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const Section *S = TAI->SectionForGlobal(GV);
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DOUT << "Section " << S->getName() << " for global " << GV->getName() << "\n";
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// If this is an external global, emit it now. TODO: Note that it would be
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// If this is an external global, emit it now. TODO: Note that it would be
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// better to ignore the symbol here and only add it to the symbol table if
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// better to ignore the symbol here and only add it to the symbol table if
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// referenced.
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// referenced.
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@ -164,13 +166,13 @@ void ELFWriter::EmitGlobal(GlobalVariable *GV) {
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return;
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return;
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}
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}
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unsigned Align = TM.getTargetData()->getPreferredAlignment(GV);
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const TargetData *TD = TM.getTargetData();
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unsigned Size =
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unsigned Align = TD->getPreferredAlignment(GV);
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TM.getTargetData()->getTypeAllocSize(GV->getType()->getElementType());
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Constant *CV = GV->getInitializer();
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unsigned Size = TD->getTypeAllocSize(CV->getType());
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// If this global has a zero initializer, it is part of the .bss or common
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// If this global has a zero initializer, go to .bss or common section.
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// section.
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if (CV->isNullValue() || isa<UndefValue>(CV)) {
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if (GV->getInitializer()->isNullValue()) {
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// If this global is part of the common block, add it now. Variables are
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// If this global is part of the common block, add it now. Variables are
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// part of the common block if they are zero initialized and allowed to be
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// part of the common block if they are zero initialized and allowed to be
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// merged with other symbols.
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// merged with other symbols.
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@ -182,14 +184,14 @@ void ELFWriter::EmitGlobal(GlobalVariable *GV) {
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CommonSym.Size = Size;
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CommonSym.Size = Size;
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CommonSym.SetBind(ELFSym::STB_GLOBAL);
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CommonSym.SetBind(ELFSym::STB_GLOBAL);
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CommonSym.SetType(ELFSym::STT_OBJECT);
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CommonSym.SetType(ELFSym::STT_OBJECT);
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// TODO SOMEDAY: add ELF visibility.
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CommonSym.SectionIdx = ELFSection::SHN_COMMON;
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CommonSym.SectionIdx = ELFSection::SHN_COMMON;
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SymbolTable.push_back(CommonSym);
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SymbolTable.push_back(CommonSym);
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getSection(S->getName(), ELFSection::SHT_NOBITS,
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ELFSection::SHF_WRITE | ELFSection::SHF_ALLOC, 1);
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return;
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return;
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}
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}
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// Otherwise, this symbol is part of the .bss section. Emit it now.
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// Otherwise, this symbol is part of the .bss section. Emit it now.
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// Handle alignment. Ensure section is aligned at least as much as required
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// Handle alignment. Ensure section is aligned at least as much as required
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// by this symbol.
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// by this symbol.
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ELFSection &BSSSection = getBSSSection();
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ELFSection &BSSSection = getBSSSection();
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@ -227,11 +229,124 @@ void ELFWriter::EmitGlobal(GlobalVariable *GV) {
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return;
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return;
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}
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}
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// FIXME: handle .rodata
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/// Emit the Global symbol to the right ELF section
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//assert(!GV->isConstant() && "unimp");
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ELFSym GblSym(GV);
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GblSym.Size = Size;
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GblSym.SetType(ELFSym::STT_OBJECT);
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GblSym.SetBind(ELFSym::STB_GLOBAL);
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unsigned Flags = S->getFlags();
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unsigned SectType = ELFSection::SHT_PROGBITS;
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unsigned SHdrFlags = ELFSection::SHF_ALLOC;
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// FIXME: handle .data
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if (Flags & SectionFlags::Code)
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//assert(0 && "unimp");
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SHdrFlags |= ELFSection::SHF_EXECINSTR;
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if (Flags & SectionFlags::Writeable)
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SHdrFlags |= ELFSection::SHF_WRITE;
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if (Flags & SectionFlags::Mergeable)
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SHdrFlags |= ELFSection::SHF_MERGE;
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if (Flags & SectionFlags::TLS)
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SHdrFlags |= ELFSection::SHF_TLS;
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if (Flags & SectionFlags::Strings)
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SHdrFlags |= ELFSection::SHF_STRINGS;
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// Remove tab from section name prefix
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std::string SectionName(S->getName());
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size_t Pos = SectionName.find("\t");
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if (Pos != std::string::npos)
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SectionName.erase(Pos, 1);
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// The section alignment should be bound to the element with
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// the largest alignment
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ELFSection &ElfS = getSection(SectionName, SectType, SHdrFlags);
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GblSym.SectionIdx = ElfS.SectionIdx;
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if (Align > ElfS.Align)
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ElfS.Align = Align;
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DataBuffer &GblCstBuf = ElfS.SectionData;
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OutputBuffer GblCstTab(GblCstBuf, is64Bit, isLittleEndian);
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// S.Value should contain the symbol index inside the section,
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// and all symbols should start on their required alignment boundary
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GblSym.Value = (GblCstBuf.size() + (Align-1)) & (-Align);
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GblCstBuf.insert(GblCstBuf.end(), GblSym.Value-GblCstBuf.size(), 0);
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// Emit the constant symbol to its section
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EmitGlobalConstant(CV, GblCstTab);
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SymbolTable.push_back(GblSym);
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}
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void ELFWriter::EmitGlobalConstantStruct(const ConstantStruct *CVS,
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OutputBuffer &GblCstTab) {
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||||||
|
// Print the fields in successive locations. Pad to align if needed!
|
||||||
|
const TargetData *TD = TM.getTargetData();
|
||||||
|
unsigned Size = TD->getTypeAllocSize(CVS->getType());
|
||||||
|
const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
|
||||||
|
uint64_t sizeSoFar = 0;
|
||||||
|
for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
|
||||||
|
const Constant* field = CVS->getOperand(i);
|
||||||
|
|
||||||
|
// Check if padding is needed and insert one or more 0s.
|
||||||
|
uint64_t fieldSize = TD->getTypeAllocSize(field->getType());
|
||||||
|
uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1))
|
||||||
|
- cvsLayout->getElementOffset(i)) - fieldSize;
|
||||||
|
sizeSoFar += fieldSize + padSize;
|
||||||
|
|
||||||
|
// Now print the actual field value.
|
||||||
|
EmitGlobalConstant(field, GblCstTab);
|
||||||
|
|
||||||
|
// Insert padding - this may include padding to increase the size of the
|
||||||
|
// current field up to the ABI size (if the struct is not packed) as well
|
||||||
|
// as padding to ensure that the next field starts at the right offset.
|
||||||
|
for (unsigned p=0; p < padSize; p++)
|
||||||
|
GblCstTab.outbyte(0);
|
||||||
|
}
|
||||||
|
assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
|
||||||
|
"Layout of constant struct may be incorrect!");
|
||||||
|
}
|
||||||
|
|
||||||
|
void ELFWriter::EmitGlobalConstant(const Constant *CV, OutputBuffer &GblCstTab) {
|
||||||
|
const TargetData *TD = TM.getTargetData();
|
||||||
|
unsigned Size = TD->getTypeAllocSize(CV->getType());
|
||||||
|
|
||||||
|
if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
|
||||||
|
if (CVA->isString()) {
|
||||||
|
std::string GblStr = CVA->getAsString();
|
||||||
|
GblCstTab.outstring(GblStr, GblStr.length());
|
||||||
|
} else { // Not a string. Print the values in successive locations
|
||||||
|
for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
|
||||||
|
EmitGlobalConstant(CVA->getOperand(i), GblCstTab);
|
||||||
|
}
|
||||||
|
return;
|
||||||
|
} else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
|
||||||
|
EmitGlobalConstantStruct(CVS, GblCstTab);
|
||||||
|
return;
|
||||||
|
} else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
|
||||||
|
uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
|
||||||
|
if (CFP->getType() == Type::DoubleTy)
|
||||||
|
GblCstTab.outxword(Val);
|
||||||
|
else if (CFP->getType() == Type::FloatTy)
|
||||||
|
GblCstTab.outword(Val);
|
||||||
|
else if (CFP->getType() == Type::X86_FP80Ty) {
|
||||||
|
assert(0 && "X86_FP80Ty global emission not implemented");
|
||||||
|
} else if (CFP->getType() == Type::PPC_FP128Ty)
|
||||||
|
assert(0 && "PPC_FP128Ty global emission not implemented");
|
||||||
|
return;
|
||||||
|
} else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
|
||||||
|
if (Size == 4)
|
||||||
|
GblCstTab.outword(CI->getZExtValue());
|
||||||
|
else if (Size == 8)
|
||||||
|
GblCstTab.outxword(CI->getZExtValue());
|
||||||
|
else
|
||||||
|
assert(0 && "LargeInt global emission not implemented");
|
||||||
|
return;
|
||||||
|
} else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
|
||||||
|
const VectorType *PTy = CP->getType();
|
||||||
|
for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
|
||||||
|
EmitGlobalConstant(CP->getOperand(I), GblCstTab);
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
assert(0 && "unknown global constant");
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
||||||
@ -243,12 +358,27 @@ bool ELFWriter::runOnMachineFunction(MachineFunction &MF) {
|
|||||||
/// doFinalization - Now that the module has been completely processed, emit
|
/// doFinalization - Now that the module has been completely processed, emit
|
||||||
/// the ELF file to 'O'.
|
/// the ELF file to 'O'.
|
||||||
bool ELFWriter::doFinalization(Module &M) {
|
bool ELFWriter::doFinalization(Module &M) {
|
||||||
// Okay, the ELF header and .text sections have been completed, build the
|
/// FIXME: This should be removed when moving to BinaryObjects. Since the
|
||||||
// .data, .bss, and "common" sections next.
|
/// current ELFCodeEmiter uses CurrBuff, ... it doesn't update S.SectionData
|
||||||
|
/// vector size for .text sections, so this is a quick dirty fix
|
||||||
|
ELFSection &TS = getTextSection();
|
||||||
|
if (TS.Size)
|
||||||
|
for (unsigned e=0; e<TS.Size; ++e)
|
||||||
|
TS.SectionData.push_back(TS.SectionData[e]);
|
||||||
|
|
||||||
|
// Get .data and .bss section, they should always be present in the binary
|
||||||
|
getDataSection();
|
||||||
|
getBSSSection();
|
||||||
|
|
||||||
|
// build data, bss and "common" sections.
|
||||||
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
|
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
|
||||||
I != E; ++I)
|
I != E; ++I)
|
||||||
EmitGlobal(I);
|
EmitGlobal(I);
|
||||||
|
|
||||||
|
// Emit non-executable stack note
|
||||||
|
if (TAI->getNonexecutableStackDirective())
|
||||||
|
getSection(".note.GNU-stack", ELFSection::SHT_PROGBITS, 0, 1);
|
||||||
|
|
||||||
// Emit the symbol table now, if non-empty.
|
// Emit the symbol table now, if non-empty.
|
||||||
EmitSymbolTable();
|
EmitSymbolTable();
|
||||||
|
|
||||||
@ -274,6 +404,51 @@ bool ELFWriter::doFinalization(Module &M) {
|
|||||||
void ELFWriter::EmitRelocations() {
|
void ELFWriter::EmitRelocations() {
|
||||||
}
|
}
|
||||||
|
|
||||||
|
/// EmitSymbol - Write symbol 'Sym' to the symbol table 'SymTabOut'
|
||||||
|
void ELFWriter::EmitSymbol(OutputBuffer &SymTabOut, ELFSym &Sym) {
|
||||||
|
if (is64Bit) {
|
||||||
|
SymTabOut.outword(Sym.NameIdx);
|
||||||
|
SymTabOut.outbyte(Sym.Info);
|
||||||
|
SymTabOut.outbyte(Sym.Other);
|
||||||
|
SymTabOut.outhalf(Sym.SectionIdx);
|
||||||
|
SymTabOut.outaddr64(Sym.Value);
|
||||||
|
SymTabOut.outxword(Sym.Size);
|
||||||
|
} else {
|
||||||
|
SymTabOut.outword(Sym.NameIdx);
|
||||||
|
SymTabOut.outaddr32(Sym.Value);
|
||||||
|
SymTabOut.outword(Sym.Size);
|
||||||
|
SymTabOut.outbyte(Sym.Info);
|
||||||
|
SymTabOut.outbyte(Sym.Other);
|
||||||
|
SymTabOut.outhalf(Sym.SectionIdx);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// EmitSectionHeader - Write section 'Section' header in 'TableOut'
|
||||||
|
/// Section Header Table
|
||||||
|
void ELFWriter::EmitSectionHeader(OutputBuffer &TableOut, const ELFSection &S) {
|
||||||
|
TableOut.outword(S.NameIdx);
|
||||||
|
TableOut.outword(S.Type);
|
||||||
|
if (is64Bit) {
|
||||||
|
TableOut.outxword(S.Flags);
|
||||||
|
TableOut.outaddr(S.Addr);
|
||||||
|
TableOut.outaddr(S.Offset);
|
||||||
|
TableOut.outxword(S.Size);
|
||||||
|
TableOut.outword(S.Link);
|
||||||
|
TableOut.outword(S.Info);
|
||||||
|
TableOut.outxword(S.Align);
|
||||||
|
TableOut.outxword(S.EntSize);
|
||||||
|
} else {
|
||||||
|
TableOut.outword(S.Flags);
|
||||||
|
TableOut.outaddr(S.Addr);
|
||||||
|
TableOut.outaddr(S.Offset);
|
||||||
|
TableOut.outword(S.Size);
|
||||||
|
TableOut.outword(S.Link);
|
||||||
|
TableOut.outword(S.Info);
|
||||||
|
TableOut.outword(S.Align);
|
||||||
|
TableOut.outword(S.EntSize);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
/// EmitSymbolTable - If the current symbol table is non-empty, emit the string
|
/// EmitSymbolTable - If the current symbol table is non-empty, emit the string
|
||||||
/// table for it and then the symbol table itself.
|
/// table for it and then the symbol table itself.
|
||||||
void ELFWriter::EmitSymbolTable() {
|
void ELFWriter::EmitSymbolTable() {
|
||||||
@ -282,14 +457,13 @@ void ELFWriter::EmitSymbolTable() {
|
|||||||
// FIXME: compact all local symbols to the start of the symtab.
|
// FIXME: compact all local symbols to the start of the symtab.
|
||||||
unsigned FirstNonLocalSymbol = 1;
|
unsigned FirstNonLocalSymbol = 1;
|
||||||
|
|
||||||
ELFSection &StrTab = getSection(".strtab", ELFSection::SHT_STRTAB, 0);
|
ELFSection &StrTab = getStringTableSection();
|
||||||
StrTab.Align = 1;
|
|
||||||
|
|
||||||
DataBuffer &StrTabBuf = StrTab.SectionData;
|
DataBuffer &StrTabBuf = StrTab.SectionData;
|
||||||
OutputBuffer StrTabOut(StrTabBuf, is64Bit, isLittleEndian);
|
OutputBuffer StrTabOut(StrTabBuf, is64Bit, isLittleEndian);
|
||||||
|
|
||||||
// Set the zero'th symbol to a null byte, as required.
|
// Set the zero'th symbol to a null byte, as required.
|
||||||
StrTabOut.outbyte(0);
|
StrTabOut.outbyte(0);
|
||||||
|
|
||||||
unsigned Index = 1;
|
unsigned Index = 1;
|
||||||
for (unsigned i = 1, e = SymbolTable.size(); i != e; ++i) {
|
for (unsigned i = 1, e = SymbolTable.size(); i != e; ++i) {
|
||||||
// Use the name mangler to uniquify the LLVM symbol.
|
// Use the name mangler to uniquify the LLVM symbol.
|
||||||
@ -315,35 +489,19 @@ void ELFWriter::EmitSymbolTable() {
|
|||||||
|
|
||||||
// Now that we have emitted the string table and know the offset into the
|
// Now that we have emitted the string table and know the offset into the
|
||||||
// string table of each symbol, emit the symbol table itself.
|
// string table of each symbol, emit the symbol table itself.
|
||||||
ELFSection &SymTab = getSection(".symtab", ELFSection::SHT_SYMTAB, 0);
|
ELFSection &SymTab = getSymbolTableSection();
|
||||||
SymTab.Align = is64Bit ? 8 : 4;
|
SymTab.Align = is64Bit ? 8 : 4;
|
||||||
SymTab.Link = StrTab.SectionIdx; // Section Index of .strtab.
|
SymTab.Link = StrTab.SectionIdx; // Section Index of .strtab.
|
||||||
SymTab.Info = FirstNonLocalSymbol; // First non-STB_LOCAL symbol.
|
SymTab.Info = FirstNonLocalSymbol; // First non-STB_LOCAL symbol.
|
||||||
SymTab.EntSize = is64Bit ? 24 : 16; // Size of each symtab entry.
|
|
||||||
|
// Size of each symtab entry.
|
||||||
|
SymTab.EntSize = ELFSym::getEntrySize(is64Bit);
|
||||||
|
|
||||||
DataBuffer &SymTabBuf = SymTab.SectionData;
|
DataBuffer &SymTabBuf = SymTab.SectionData;
|
||||||
OutputBuffer SymTabOut(SymTabBuf, is64Bit, isLittleEndian);
|
OutputBuffer SymTabOut(SymTabBuf, is64Bit, isLittleEndian);
|
||||||
|
|
||||||
if (!is64Bit) { // 32-bit and 64-bit formats are shuffled a bit.
|
for (unsigned i = 0, e = SymbolTable.size(); i != e; ++i)
|
||||||
for (unsigned i = 0, e = SymbolTable.size(); i != e; ++i) {
|
EmitSymbol(SymTabOut, SymbolTable[i]);
|
||||||
ELFSym &Sym = SymbolTable[i];
|
|
||||||
SymTabOut.outword(Sym.NameIdx);
|
|
||||||
SymTabOut.outaddr32(Sym.Value);
|
|
||||||
SymTabOut.outword(Sym.Size);
|
|
||||||
SymTabOut.outbyte(Sym.Info);
|
|
||||||
SymTabOut.outbyte(Sym.Other);
|
|
||||||
SymTabOut.outhalf(Sym.SectionIdx);
|
|
||||||
}
|
|
||||||
} else {
|
|
||||||
for (unsigned i = 0, e = SymbolTable.size(); i != e; ++i) {
|
|
||||||
ELFSym &Sym = SymbolTable[i];
|
|
||||||
SymTabOut.outword(Sym.NameIdx);
|
|
||||||
SymTabOut.outbyte(Sym.Info);
|
|
||||||
SymTabOut.outbyte(Sym.Other);
|
|
||||||
SymTabOut.outhalf(Sym.SectionIdx);
|
|
||||||
SymTabOut.outaddr64(Sym.Value);
|
|
||||||
SymTabOut.outxword(Sym.Size);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
SymTab.Size = SymTabBuf.size();
|
SymTab.Size = SymTabBuf.size();
|
||||||
}
|
}
|
||||||
@ -393,7 +551,7 @@ void ELFWriter::OutputSectionsAndSectionTable() {
|
|||||||
// Pass #1: Compute the file offset for each section.
|
// Pass #1: Compute the file offset for each section.
|
||||||
size_t FileOff = FileHeader.size(); // File header first.
|
size_t FileOff = FileHeader.size(); // File header first.
|
||||||
|
|
||||||
// Emit all of the section data in order.
|
// Adjust alignment of all section if needed.
|
||||||
for (std::list<ELFSection>::iterator I = SectionList.begin(),
|
for (std::list<ELFSection>::iterator I = SectionList.begin(),
|
||||||
E = SectionList.end(); I != E; ++I) {
|
E = SectionList.end(); I != E; ++I) {
|
||||||
|
|
||||||
@ -401,6 +559,11 @@ void ELFWriter::OutputSectionsAndSectionTable() {
|
|||||||
if (!I->SectionIdx)
|
if (!I->SectionIdx)
|
||||||
continue;
|
continue;
|
||||||
|
|
||||||
|
if (!I->SectionData.size()) {
|
||||||
|
I->Offset = FileOff;
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
|
||||||
// Update Section size
|
// Update Section size
|
||||||
if (!I->Size)
|
if (!I->Size)
|
||||||
I->Size = I->SectionData.size();
|
I->Size = I->SectionData.size();
|
||||||
@ -438,30 +601,24 @@ void ELFWriter::OutputSectionsAndSectionTable() {
|
|||||||
// Emit all of the section data and build the section table itself.
|
// Emit all of the section data and build the section table itself.
|
||||||
while (!SectionList.empty()) {
|
while (!SectionList.empty()) {
|
||||||
const ELFSection &S = *SectionList.begin();
|
const ELFSection &S = *SectionList.begin();
|
||||||
|
DOUT << "SectionIdx: " << S.SectionIdx << ", Name: " << S.Name
|
||||||
|
<< ", Size: " << S.Size << ", Offset: " << S.Offset
|
||||||
|
<< ", SectionData Size: " << S.SectionData.size() << "\n";
|
||||||
|
|
||||||
|
|
||||||
// Align FileOff to whatever the alignment restrictions of the section are.
|
// Align FileOff to whatever the alignment restrictions of the section are.
|
||||||
if (S.Align)
|
if (S.Align) {
|
||||||
for (size_t NewFileOff = (FileOff+S.Align-1) & ~(S.Align-1);
|
for (size_t NewFileOff = (FileOff+S.Align-1) & ~(S.Align-1);
|
||||||
FileOff != NewFileOff; ++FileOff)
|
FileOff != NewFileOff; ++FileOff)
|
||||||
O << (char)0xAB;
|
O << (char)0xAB;
|
||||||
O.write((char*)&S.SectionData[0], S.Size);
|
}
|
||||||
|
|
||||||
DOUT << "SectionIdx: " << S.SectionIdx << ", Name: " << S.Name
|
if (S.SectionData.size()) {
|
||||||
<< ", Size: " << S.Size << ", Offset: " << S.Offset << "\n";
|
O.write((char*)&S.SectionData[0], S.Size);
|
||||||
|
FileOff += S.Size;
|
||||||
FileOff += S.Size;
|
}
|
||||||
|
|
||||||
TableOut.outword(S.NameIdx); // sh_name - Symbol table name idx
|
|
||||||
TableOut.outword(S.Type); // sh_type - Section contents & semantics
|
|
||||||
TableOut.outaddr(S.Flags); // sh_flags - Section flags.
|
|
||||||
TableOut.outaddr(S.Addr); // sh_addr - The mem addr this section is in.
|
|
||||||
TableOut.outaddr(S.Offset); // sh_offset - Offset from the file start.
|
|
||||||
TableOut.outaddr(S.Size); // sh_size - The section size.
|
|
||||||
TableOut.outword(S.Link); // sh_link - Section header table index link.
|
|
||||||
TableOut.outword(S.Info); // sh_info - Auxillary information.
|
|
||||||
TableOut.outaddr(S.Align); // sh_addralign - Alignment of section.
|
|
||||||
TableOut.outaddr(S.EntSize); // sh_entsize - Size of entries in the section
|
|
||||||
|
|
||||||
|
EmitSectionHeader(TableOut, S);
|
||||||
SectionList.pop_front();
|
SectionList.pop_front();
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -16,15 +16,19 @@
|
|||||||
|
|
||||||
#include "llvm/ADT/SetVector.h"
|
#include "llvm/ADT/SetVector.h"
|
||||||
#include "llvm/CodeGen/MachineFunctionPass.h"
|
#include "llvm/CodeGen/MachineFunctionPass.h"
|
||||||
|
#include "llvm/Support/OutputBuffer.h"
|
||||||
|
#include "llvm/Target/TargetAsmInfo.h"
|
||||||
|
#include "llvm/Target/TargetELFWriterInfo.h"
|
||||||
#include "ELF.h"
|
#include "ELF.h"
|
||||||
#include <list>
|
#include <list>
|
||||||
#include <map>
|
#include <map>
|
||||||
|
|
||||||
namespace llvm {
|
namespace llvm {
|
||||||
|
class ConstantStruct;
|
||||||
|
class ELFCodeEmitter;
|
||||||
class GlobalVariable;
|
class GlobalVariable;
|
||||||
class Mangler;
|
class Mangler;
|
||||||
class MachineCodeEmitter;
|
class MachineCodeEmitter;
|
||||||
class ELFCodeEmitter;
|
|
||||||
class raw_ostream;
|
class raw_ostream;
|
||||||
|
|
||||||
/// ELFWriter - This class implements the common target-independent code for
|
/// ELFWriter - This class implements the common target-independent code for
|
||||||
@ -59,6 +63,10 @@ namespace llvm {
|
|||||||
/// code for functions to the .o file.
|
/// code for functions to the .o file.
|
||||||
ELFCodeEmitter *MCE;
|
ELFCodeEmitter *MCE;
|
||||||
|
|
||||||
|
/// TAI - Target Asm Info, provide information about section names for
|
||||||
|
/// globals and other target specific stuff.
|
||||||
|
const TargetAsmInfo *TAI;
|
||||||
|
|
||||||
//===------------------------------------------------------------------===//
|
//===------------------------------------------------------------------===//
|
||||||
// Properties inferred automatically from the target machine.
|
// Properties inferred automatically from the target machine.
|
||||||
//===------------------------------------------------------------------===//
|
//===------------------------------------------------------------------===//
|
||||||
@ -97,8 +105,8 @@ namespace llvm {
|
|||||||
|
|
||||||
/// getSection - Return the section with the specified name, creating a new
|
/// getSection - Return the section with the specified name, creating a new
|
||||||
/// section if one does not already exist.
|
/// section if one does not already exist.
|
||||||
ELFSection &getSection(const std::string &Name,
|
ELFSection &getSection(const std::string &Name, unsigned Type,
|
||||||
unsigned Type, unsigned Flags = 0) {
|
unsigned Flags = 0, unsigned Align = 0) {
|
||||||
ELFSection *&SN = SectionLookup[Name];
|
ELFSection *&SN = SectionLookup[Name];
|
||||||
if (SN) return *SN;
|
if (SN) return *SN;
|
||||||
|
|
||||||
@ -108,6 +116,7 @@ namespace llvm {
|
|||||||
SN->Type = Type;
|
SN->Type = Type;
|
||||||
SN->Flags = Flags;
|
SN->Flags = Flags;
|
||||||
SN->Link = ELFSection::SHN_UNDEF;
|
SN->Link = ELFSection::SHN_UNDEF;
|
||||||
|
SN->Align = Align;
|
||||||
return *SN;
|
return *SN;
|
||||||
}
|
}
|
||||||
|
|
||||||
@ -116,10 +125,19 @@ namespace llvm {
|
|||||||
ELFSection::SHF_EXECINSTR | ELFSection::SHF_ALLOC);
|
ELFSection::SHF_EXECINSTR | ELFSection::SHF_ALLOC);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
ELFSection &getSymbolTableSection() {
|
||||||
|
return getSection(".symtab", ELFSection::SHT_SYMTAB, 0);
|
||||||
|
}
|
||||||
|
|
||||||
|
ELFSection &getStringTableSection() {
|
||||||
|
return getSection(".strtab", ELFSection::SHT_STRTAB, 0, 1);
|
||||||
|
}
|
||||||
|
|
||||||
ELFSection &getDataSection() {
|
ELFSection &getDataSection() {
|
||||||
return getSection(".data", ELFSection::SHT_PROGBITS,
|
return getSection(".data", ELFSection::SHT_PROGBITS,
|
||||||
ELFSection::SHF_WRITE | ELFSection::SHF_ALLOC);
|
ELFSection::SHF_WRITE | ELFSection::SHF_ALLOC);
|
||||||
}
|
}
|
||||||
|
|
||||||
ELFSection &getBSSSection() {
|
ELFSection &getBSSSection() {
|
||||||
return getSection(".bss", ELFSection::SHT_NOBITS,
|
return getSection(".bss", ELFSection::SHT_NOBITS,
|
||||||
ELFSection::SHF_WRITE | ELFSection::SHF_ALLOC);
|
ELFSection::SHF_WRITE | ELFSection::SHF_ALLOC);
|
||||||
@ -144,9 +162,14 @@ namespace llvm {
|
|||||||
unsigned ELFHdr_e_shnum_Offset; // e_shnum in ELF header.
|
unsigned ELFHdr_e_shnum_Offset; // e_shnum in ELF header.
|
||||||
private:
|
private:
|
||||||
void EmitGlobal(GlobalVariable *GV);
|
void EmitGlobal(GlobalVariable *GV);
|
||||||
void EmitSymbolTable();
|
void EmitGlobalConstant(const Constant *C, OutputBuffer &GblCstTab);
|
||||||
|
void EmitGlobalConstantStruct(const ConstantStruct *CVS,
|
||||||
|
OutputBuffer &GblCstTab);
|
||||||
void EmitRelocations();
|
void EmitRelocations();
|
||||||
|
void EmitSectionHeader(OutputBuffer &TableOut, const ELFSection &Section);
|
||||||
void EmitSectionTableStringTable();
|
void EmitSectionTableStringTable();
|
||||||
|
void EmitSymbol(OutputBuffer &SymTabOut, ELFSym &Sym);
|
||||||
|
void EmitSymbolTable();
|
||||||
void OutputSectionsAndSectionTable();
|
void OutputSectionsAndSectionTable();
|
||||||
};
|
};
|
||||||
}
|
}
|
||||||
|
@ -12,8 +12,26 @@
|
|||||||
//===----------------------------------------------------------------------===//
|
//===----------------------------------------------------------------------===//
|
||||||
|
|
||||||
#include "X86ELFWriterInfo.h"
|
#include "X86ELFWriterInfo.h"
|
||||||
|
#include "llvm/Target/TargetMachine.h"
|
||||||
|
#include "llvm/DerivedTypes.h"
|
||||||
using namespace llvm;
|
using namespace llvm;
|
||||||
|
|
||||||
X86ELFWriterInfo::X86ELFWriterInfo(bool is64Bit) :
|
X86ELFWriterInfo::X86ELFWriterInfo(TargetMachine &TM)
|
||||||
TargetELFWriterInfo(is64Bit ? EM_X86_64 : EM_386) {}
|
: TargetELFWriterInfo(TM) {
|
||||||
|
bool is64Bit = TM.getTargetData()->getPointerSizeInBits() == 64;
|
||||||
|
EMachine = is64Bit ? EM_X86_64 : EM_386;
|
||||||
|
}
|
||||||
|
|
||||||
X86ELFWriterInfo::~X86ELFWriterInfo() {}
|
X86ELFWriterInfo::~X86ELFWriterInfo() {}
|
||||||
|
|
||||||
|
unsigned X86ELFWriterInfo::getFunctionAlignment(const Function *F) const {
|
||||||
|
unsigned FnAlign = 4;
|
||||||
|
|
||||||
|
if (F->hasFnAttr(Attribute::OptimizeForSize))
|
||||||
|
FnAlign = 1;
|
||||||
|
|
||||||
|
if (F->getAlignment())
|
||||||
|
FnAlign = Log2_32(F->getAlignment());
|
||||||
|
|
||||||
|
return (1 << FnAlign);
|
||||||
|
}
|
||||||
|
@ -20,8 +20,10 @@ namespace llvm {
|
|||||||
|
|
||||||
class X86ELFWriterInfo : public TargetELFWriterInfo {
|
class X86ELFWriterInfo : public TargetELFWriterInfo {
|
||||||
public:
|
public:
|
||||||
X86ELFWriterInfo(bool is64Bit);
|
X86ELFWriterInfo(TargetMachine &TM);
|
||||||
virtual ~X86ELFWriterInfo();
|
virtual ~X86ELFWriterInfo();
|
||||||
|
|
||||||
|
virtual unsigned getFunctionAlignment(const Function *F) const;
|
||||||
};
|
};
|
||||||
|
|
||||||
} // end llvm namespace
|
} // end llvm namespace
|
||||||
|
@ -133,8 +133,7 @@ X86TargetMachine::X86TargetMachine(const Module &M, const std::string &FS,
|
|||||||
DataLayout(Subtarget.getDataLayout()),
|
DataLayout(Subtarget.getDataLayout()),
|
||||||
FrameInfo(TargetFrameInfo::StackGrowsDown,
|
FrameInfo(TargetFrameInfo::StackGrowsDown,
|
||||||
Subtarget.getStackAlignment(), Subtarget.is64Bit() ? -8 : -4),
|
Subtarget.getStackAlignment(), Subtarget.is64Bit() ? -8 : -4),
|
||||||
InstrInfo(*this), JITInfo(*this), TLInfo(*this),
|
InstrInfo(*this), JITInfo(*this), TLInfo(*this), ELFWriterInfo(*this) {
|
||||||
ELFWriterInfo(Subtarget.is64Bit()) {
|
|
||||||
DefRelocModel = getRelocationModel();
|
DefRelocModel = getRelocationModel();
|
||||||
// FIXME: Correctly select PIC model for Win64 stuff
|
// FIXME: Correctly select PIC model for Win64 stuff
|
||||||
if (getRelocationModel() == Reloc::Default) {
|
if (getRelocationModel() == Reloc::Default) {
|
||||||
|
Loading…
Reference in New Issue
Block a user