#ifndef LLVM_MC_MCASSEMBLER_H
#define LLVM_MC_MCASSEMBLER_H
+#include "llvm/MC/MCFixup.h"
+#include "llvm/MC/MCInst.h"
#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/ilist.h"
#include "llvm/ADT/ilist_node.h"
#include "llvm/Support/Casting.h"
-#include "llvm/MC/MCFixup.h"
-#include "llvm/MC/MCInst.h"
-#include "llvm/System/DataTypes.h"
+#include "llvm/Support/DataTypes.h"
#include <vector> // FIXME: Shouldn't be needed.
namespace llvm {
class raw_ostream;
class MCAsmLayout;
class MCAssembler;
+class MCBinaryExpr;
class MCContext;
class MCCodeEmitter;
class MCExpr;
class MCSymbol;
class MCSymbolData;
class MCValue;
-class TargetAsmBackend;
-
-/// MCAsmFixup - Represent a fixed size region of bytes inside some fragment
-/// which needs to be rewritten. This region will either be rewritten by the
-/// assembler or cause a relocation entry to be generated.
-//
-// FIXME: This should probably just be merged with MCFixup.
-class MCAsmFixup {
- /// Offset - The offset inside the fragment which needs to be rewritten.
- uint64_t Offset;
-
- /// Value - The expression to eventually write into the fragment.
- const MCExpr *Value;
-
- /// Kind - The fixup kind.
- MCFixupKind Kind;
-
-public:
- MCAsmFixup(uint64_t _Offset, const MCExpr &_Value, MCFixupKind _Kind)
- : Offset(_Offset), Value(&_Value), Kind(_Kind) {}
-
- MCFixupKind getKind() const { return MCFixupKind(Kind); }
-
- uint64_t getOffset() const { return Offset; }
- void setOffset(uint64_t Value) { Offset = Value; }
-
- const MCExpr *getValue() const { return Value; }
-};
+class MCAsmBackend;
class MCFragment : public ilist_node<MCFragment> {
friend class MCAsmLayout;
FT_Data,
FT_Fill,
FT_Inst,
- FT_Org
+ FT_Org,
+ FT_Dwarf,
+ FT_DwarfFrame,
+ FT_LEB
};
private:
/// initialized.
uint64_t Offset;
- /// EffectiveSize - The compute size of this section. This is ~0 until
- /// initialized.
- uint64_t EffectiveSize;
-
- /// LayoutOrder - The global layout order of this fragment. This is the index
- /// across all fragments in the file, not just within the section.
+ /// LayoutOrder - The layout order of this fragment.
unsigned LayoutOrder;
/// @}
public:
// Only for sentinel.
MCFragment();
+ virtual ~MCFragment();
FragmentType getKind() const { return Kind; }
SmallString<32> Contents;
/// Fixups - The list of fixups in this fragment.
- std::vector<MCAsmFixup> Fixups;
+ std::vector<MCFixup> Fixups;
public:
- typedef std::vector<MCAsmFixup>::const_iterator const_fixup_iterator;
- typedef std::vector<MCAsmFixup>::iterator fixup_iterator;
+ typedef std::vector<MCFixup>::const_iterator const_fixup_iterator;
+ typedef std::vector<MCFixup>::iterator fixup_iterator;
public:
MCDataFragment(MCSectionData *SD = 0) : MCFragment(FT_Data, SD) {}
/// @name Fixup Access
/// @{
- void addFixup(MCAsmFixup Fixup) {
+ void addFixup(MCFixup Fixup) {
// Enforce invariant that fixups are in offset order.
assert((Fixups.empty() || Fixup.getOffset() > Fixups.back().getOffset()) &&
"Fixups must be added in order!");
Fixups.push_back(Fixup);
}
- std::vector<MCAsmFixup> &getFixups() { return Fixups; }
- const std::vector<MCAsmFixup> &getFixups() const { return Fixups; }
+ std::vector<MCFixup> &getFixups() { return Fixups; }
+ const std::vector<MCFixup> &getFixups() const { return Fixups; }
fixup_iterator fixup_begin() { return Fixups.begin(); }
const_fixup_iterator fixup_begin() const { return Fixups.begin(); }
/// Inst - The instruction this is a fragment for.
MCInst Inst;
- /// InstSize - The size of the currently encoded instruction.
+ /// Code - Binary data for the currently encoded instruction.
SmallString<8> Code;
/// Fixups - The list of fixups in this fragment.
- SmallVector<MCAsmFixup, 1> Fixups;
+ SmallVector<MCFixup, 1> Fixups;
public:
- typedef SmallVectorImpl<MCAsmFixup>::const_iterator const_fixup_iterator;
- typedef SmallVectorImpl<MCAsmFixup>::iterator fixup_iterator;
+ typedef SmallVectorImpl<MCFixup>::const_iterator const_fixup_iterator;
+ typedef SmallVectorImpl<MCFixup>::iterator fixup_iterator;
public:
MCInstFragment(MCInst _Inst, MCSectionData *SD = 0)
/// @name Fixup Access
/// @{
- SmallVectorImpl<MCAsmFixup> &getFixups() { return Fixups; }
- const SmallVectorImpl<MCAsmFixup> &getFixups() const { return Fixups; }
+ SmallVectorImpl<MCFixup> &getFixups() { return Fixups; }
+ const SmallVectorImpl<MCFixup> &getFixups() const { return Fixups; }
fixup_iterator fixup_begin() { return Fixups.begin(); }
const_fixup_iterator fixup_begin() const { return Fixups.begin(); }
/// target dependent.
bool EmitNops : 1;
- /// OnlyAlignAddress - Flag to indicate that this align is only used to adjust
- /// the address space size of a section and that it should not be included as
- /// part of the section size. This flag can only be used on the last fragment
- /// in a section.
- bool OnlyAlignAddress : 1;
-
public:
MCAlignFragment(unsigned _Alignment, int64_t _Value, unsigned _ValueSize,
unsigned _MaxBytesToEmit, MCSectionData *SD = 0)
: MCFragment(FT_Align, SD), Alignment(_Alignment),
Value(_Value),ValueSize(_ValueSize),
- MaxBytesToEmit(_MaxBytesToEmit), EmitNops(false),
- OnlyAlignAddress(false) {}
+ MaxBytesToEmit(_MaxBytesToEmit), EmitNops(false) {}
/// @name Accessors
/// @{
bool hasEmitNops() const { return EmitNops; }
void setEmitNops(bool Value) { EmitNops = Value; }
- bool hasOnlyAlignAddress() const { return OnlyAlignAddress; }
- void setOnlyAlignAddress(bool Value) { OnlyAlignAddress = Value; }
-
/// @}
static bool classof(const MCFragment *F) {
static bool classof(const MCOrgFragment *) { return true; }
};
+class MCLEBFragment : public MCFragment {
+ /// Value - The value this fragment should contain.
+ const MCExpr *Value;
+
+ /// IsSigned - True if this is a sleb128, false if uleb128.
+ bool IsSigned;
+
+ SmallString<8> Contents;
+public:
+ MCLEBFragment(const MCExpr &Value_, bool IsSigned_, MCSectionData *SD)
+ : MCFragment(FT_LEB, SD),
+ Value(&Value_), IsSigned(IsSigned_) { Contents.push_back(0); }
+
+ /// @name Accessors
+ /// @{
+
+ const MCExpr &getValue() const { return *Value; }
+
+ bool isSigned() const { return IsSigned; }
+
+ SmallString<8> &getContents() { return Contents; }
+ const SmallString<8> &getContents() const { return Contents; }
+
+ /// @}
+
+ static bool classof(const MCFragment *F) {
+ return F->getKind() == MCFragment::FT_LEB;
+ }
+ static bool classof(const MCLEBFragment *) { return true; }
+};
+
+class MCDwarfLineAddrFragment : public MCFragment {
+ /// LineDelta - the value of the difference between the two line numbers
+ /// between two .loc dwarf directives.
+ int64_t LineDelta;
+
+ /// AddrDelta - The expression for the difference of the two symbols that
+ /// make up the address delta between two .loc dwarf directives.
+ const MCExpr *AddrDelta;
+
+ SmallString<8> Contents;
+
+public:
+ MCDwarfLineAddrFragment(int64_t _LineDelta, const MCExpr &_AddrDelta,
+ MCSectionData *SD)
+ : MCFragment(FT_Dwarf, SD),
+ LineDelta(_LineDelta), AddrDelta(&_AddrDelta) { Contents.push_back(0); }
+
+ /// @name Accessors
+ /// @{
+
+ int64_t getLineDelta() const { return LineDelta; }
+
+ const MCExpr &getAddrDelta() const { return *AddrDelta; }
+
+ SmallString<8> &getContents() { return Contents; }
+ const SmallString<8> &getContents() const { return Contents; }
+
+ /// @}
+
+ static bool classof(const MCFragment *F) {
+ return F->getKind() == MCFragment::FT_Dwarf;
+ }
+ static bool classof(const MCDwarfLineAddrFragment *) { return true; }
+};
+
+class MCDwarfCallFrameFragment : public MCFragment {
+ /// AddrDelta - The expression for the difference of the two symbols that
+ /// make up the address delta between two .cfi_* dwarf directives.
+ const MCExpr *AddrDelta;
+
+ SmallString<8> Contents;
+
+public:
+ MCDwarfCallFrameFragment(const MCExpr &_AddrDelta, MCSectionData *SD)
+ : MCFragment(FT_DwarfFrame, SD),
+ AddrDelta(&_AddrDelta) { Contents.push_back(0); }
+
+ /// @name Accessors
+ /// @{
+
+ const MCExpr &getAddrDelta() const { return *AddrDelta; }
+
+ SmallString<8> &getContents() { return Contents; }
+ const SmallString<8> &getContents() const { return Contents; }
+
+ /// @}
+
+ static bool classof(const MCFragment *F) {
+ return F->getKind() == MCFragment::FT_DwarfFrame;
+ }
+ static bool classof(const MCDwarfCallFrameFragment *) { return true; }
+};
+
// FIXME: Should this be a separate class, or just merged into MCSection? Since
// we anticipate the fast path being through an MCAssembler, the only reason to
// keep it out is for API abstraction.
typedef FragmentListType::reverse_iterator reverse_iterator;
private:
- iplist<MCFragment> Fragments;
+ FragmentListType Fragments;
const MCSection *Section;
/// Ordinal - The section index in the assemblers section list.
//
// FIXME: This could all be kept private to the assembler implementation.
- /// Address - The computed address of this section. This is ~0 until
- /// initialized.
- uint64_t Address;
-
/// HasInstructions - Whether this section has had instructions emitted into
/// it.
unsigned HasInstructions : 1;
// common symbol can never get a definition.
uint64_t CommonSize;
+ /// SymbolSize - An expression describing how to calculate the size of
+ /// a symbol. If a symbol has no size this field will be NULL.
+ const MCExpr *SymbolSize;
+
/// CommonAlign - The alignment of the symbol, if it is 'common'.
//
// FIXME: Pack this in with other fields?
return CommonSize;
}
+ void setSize(const MCExpr *SS) {
+ SymbolSize = SS;
+ }
+
+ const MCExpr *getSize() const {
+ return SymbolSize;
+ }
+
+
/// getCommonAlignment - Return the alignment of a 'common' symbol.
unsigned getCommonAlignment() const {
assert(isCommon() && "Not a 'common' symbol!");
MCContext &Context;
- TargetAsmBackend &Backend;
+ MCAsmBackend &Backend;
MCCodeEmitter &Emitter;
+ MCObjectWriter &Writer;
+
raw_ostream &OS;
iplist<MCSectionData> Sections;
std::vector<IndirectSymbolData> IndirectSymbols;
+ /// The set of function symbols for which a .thumb_func directive has
+ /// been seen.
+ //
+ // FIXME: We really would like this in target specific code rather than
+ // here. Maybe when the relocation stuff moves to target specific,
+ // this can go with it? The streamer would need some target specific
+ // refactoring too.
+ SmallPtrSet<const MCSymbol*, 64> ThumbFuncs;
+
unsigned RelaxAll : 1;
+ unsigned NoExecStack : 1;
unsigned SubsectionsViaSymbols : 1;
private:
/// \param DF The fragment the fixup is inside.
/// \param Target [out] On return, the relocatable expression the fixup
/// evaluates to.
- /// \param Value [out] On return, the value of the fixup as currently layed
+ /// \param Value [out] On return, the value of the fixup as currently laid
/// out.
/// \return Whether the fixup value was fully resolved. This is true if the
/// \arg Value result is fixed, otherwise the value may change due to
/// relocation.
bool EvaluateFixup(const MCAsmLayout &Layout,
- const MCAsmFixup &Fixup, const MCFragment *DF,
+ const MCFixup &Fixup, const MCFragment *DF,
MCValue &Target, uint64_t &Value) const;
/// Check whether a fixup can be satisfied, or whether it needs to be relaxed
/// (increased in size, in order to hold its value correctly).
- bool FixupNeedsRelaxation(const MCAsmFixup &Fixup, const MCFragment *DF,
+ bool FixupNeedsRelaxation(const MCFixup &Fixup, const MCFragment *DF,
const MCAsmLayout &Layout) const;
/// Check whether the given fragment needs relaxation.
bool FragmentNeedsRelaxation(const MCInstFragment *IF,
const MCAsmLayout &Layout) const;
- /// Compute the effective fragment size assuming it is layed out at the given
- /// \arg SectionAddress and \arg FragmentOffset.
- uint64_t ComputeFragmentSize(MCAsmLayout &Layout, const MCFragment &F,
- uint64_t SectionAddress,
- uint64_t FragmentOffset) const;
-
/// LayoutOnce - Perform one layout iteration and return true if any offsets
/// were adjusted.
bool LayoutOnce(MCAsmLayout &Layout);
+ bool LayoutSectionOnce(MCAsmLayout &Layout, MCSectionData &SD);
+
+ bool RelaxInstruction(MCAsmLayout &Layout, MCInstFragment &IF);
+
+ bool RelaxLEB(MCAsmLayout &Layout, MCLEBFragment &IF);
+
+ bool RelaxDwarfLineAddr(MCAsmLayout &Layout, MCDwarfLineAddrFragment &DF);
+ bool RelaxDwarfCallFrameFragment(MCAsmLayout &Layout,
+ MCDwarfCallFrameFragment &DF);
+
/// FinishLayout - Finalize a layout, including fragment lowering.
void FinishLayout(MCAsmLayout &Layout);
+ uint64_t HandleFixup(const MCAsmLayout &Layout,
+ MCFragment &F, const MCFixup &Fixup);
+
public:
+ /// Compute the effective fragment size assuming it is laid out at the given
+ /// \arg SectionAddress and \arg FragmentOffset.
+ uint64_t ComputeFragmentSize(const MCAsmLayout &Layout, const MCFragment &F) const;
+
/// Find the symbol which defines the atom containing the given symbol, or
/// null if there is no such symbol.
- const MCSymbolData *getAtom(const MCAsmLayout &Layout,
- const MCSymbolData *Symbol) const;
+ const MCSymbolData *getAtom(const MCSymbolData *Symbol) const;
/// Check whether a particular symbol is visible to the linker and is required
/// in the symbol table, or whether it can be discarded by the assembler. This
/// also effects whether the assembler treats the label as potentially
/// defining a separate atom.
- bool isSymbolLinkerVisible(const MCSymbolData *SD) const;
+ bool isSymbolLinkerVisible(const MCSymbol &SD) const;
/// Emit the section contents using the given object writer.
- //
- // FIXME: Should MCAssembler always have a reference to the object writer?
- void WriteSectionData(const MCSectionData *Section, const MCAsmLayout &Layout,
- MCObjectWriter *OW) const;
+ void WriteSectionData(const MCSectionData *Section,
+ const MCAsmLayout &Layout) const;
+
+ /// Check whether a given symbol has been flagged with .thumb_func.
+ bool isThumbFunc(const MCSymbol *Func) const {
+ return ThumbFuncs.count(Func);
+ }
+
+ /// Flag a function symbol as the target of a .thumb_func directive.
+ void setIsThumbFunc(const MCSymbol *Func) { ThumbFuncs.insert(Func); }
public:
/// Construct a new assembler instance.
// concrete and require clients to pass in a target like object. The other
// option is to make this abstract, and have targets provide concrete
// implementations as we do with AsmParser.
- MCAssembler(MCContext &_Context, TargetAsmBackend &_Backend,
- MCCodeEmitter &_Emitter, raw_ostream &OS);
+ MCAssembler(MCContext &Context_, MCAsmBackend &Backend_,
+ MCCodeEmitter &Emitter_, MCObjectWriter &Writer_,
+ raw_ostream &OS);
~MCAssembler();
MCContext &getContext() const { return Context; }
- TargetAsmBackend &getBackend() const { return Backend; }
+ MCAsmBackend &getBackend() const { return Backend; }
MCCodeEmitter &getEmitter() const { return Emitter; }
+ MCObjectWriter &getWriter() const { return Writer; }
+
/// Finish - Do final processing and write the object to the output stream.
+ /// \arg Writer is used for custom object writer (as the MCJIT does),
+ /// if not specified it is automatically created from backend.
void Finish();
// FIXME: This does not belong here.
bool getRelaxAll() const { return RelaxAll; }
void setRelaxAll(bool Value) { RelaxAll = Value; }
+ bool getNoExecStack() const { return NoExecStack; }
+ void setNoExecStack(bool Value) { NoExecStack = Value; }
+
/// @name Section List Access
/// @{
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