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Theodosius/dependencies/asmjit/core/codeholder.h

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// AsmJit - Machine code generation for C++
//
// * Official AsmJit Home Page: https://asmjit.com
// * Official Github Repository: https://github.com/asmjit/asmjit
//
// Copyright (c) 2008-2020 The AsmJit Authors
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source distribution.
#ifndef ASMJIT_CORE_CODEHOLDER_H_INCLUDED
#define ASMJIT_CORE_CODEHOLDER_H_INCLUDED
#include "../core/archtraits.h"
#include "../core/codebuffer.h"
#include "../core/datatypes.h"
#include "../core/errorhandler.h"
#include "../core/operand.h"
#include "../core/string.h"
#include "../core/support.h"
#include "../core/target.h"
#include "../core/zone.h"
#include "../core/zonehash.h"
#include "../core/zonestring.h"
#include "../core/zonetree.h"
#include "../core/zonevector.h"
ASMJIT_BEGIN_NAMESPACE
//! \addtogroup asmjit_core
//! \{
// ============================================================================
// [Forward Declarations]
// ============================================================================
class BaseEmitter;
class CodeHolder;
class LabelEntry;
class Logger;
// ============================================================================
// [asmjit::AlignMode]
// ============================================================================
//! Align mode.
enum AlignMode : uint32_t {
//! Align executable code.
kAlignCode = 0,
//! Align non-executable code.
kAlignData = 1,
//! Align by a sequence of zeros.
kAlignZero = 2,
//! Count of alignment modes.
kAlignCount = 3
};
// ============================================================================
// [asmjit::Expression]
// ============================================================================
//! Expression node that can reference constants, labels, and another expressions.
struct Expression {
//! Operation type.
enum OpType : uint8_t {
//! Addition.
kOpAdd = 0,
//! Subtraction.
kOpSub = 1,
//! Multiplication
kOpMul = 2,
//! Logical left shift.
kOpSll = 3,
//! Logical right shift.
kOpSrl = 4,
//! Arithmetic right shift.
kOpSra = 5
};
//! Type of \ref Value.
enum ValueType : uint8_t {
//! No value or invalid.
kValueNone = 0,
//! Value is 64-bit unsigned integer (constant).
kValueConstant = 1,
//! Value is \ref LabelEntry, which references a \ref Label.
kValueLabel = 2,
//! Value is \ref Expression
kValueExpression = 3
};
//! Expression value.
union Value {
//! Constant.
uint64_t constant;
//! Pointer to another expression.
Expression* expression;
//! Poitner to \ref LabelEntry.
LabelEntry* label;
};
//! Operation type.
uint8_t opType;
//! Value types of \ref value.
uint8_t valueType[2];
//! Reserved for future use, should be initialized to zero.
uint8_t reserved[5];
//! Expression left and right values.
Value value[2];
//! Resets the whole expression.
//!
//! Changes both values to \ref kValueNone.
inline void reset() noexcept { memset(this, 0, sizeof(*this)); }
//! Sets the value type at `index` to \ref kValueConstant and its content to `constant`.
inline void setValueAsConstant(size_t index, uint64_t constant) noexcept {
valueType[index] = kValueConstant;
value[index].constant = constant;
}
//! Sets the value type at `index` to \ref kValueLabel and its content to `labelEntry`.
inline void setValueAsLabel(size_t index, LabelEntry* labelEntry) noexcept {
valueType[index] = kValueLabel;
value[index].label = labelEntry;
}
//! Sets the value type at `index` to \ref kValueExpression and its content to `expression`.
inline void setValueAsExpression(size_t index, Expression* expression) noexcept {
valueType[index] = kValueLabel;
value[index].expression = expression;
}
};
// ============================================================================
// [asmjit::Section]
// ============================================================================
//! Section entry.
class Section {
public:
//! Section id.
uint32_t _id;
//! Section flags.
uint32_t _flags;
//! Section alignment requirements (0 if no requirements).
uint32_t _alignment;
//! Order (lower value means higher priority).
int32_t _order;
//! Offset of this section from base-address.
uint64_t _offset;
//! Virtual size of the section (zero initialized sections).
uint64_t _virtualSize;
//! Section name (max 35 characters, PE allows max 8).
FixedString<Globals::kMaxSectionNameSize + 1> _name;
//! Code or data buffer.
CodeBuffer _buffer;
//! Section flags.
enum Flags : uint32_t {
//! Executable (.text sections).
kFlagExec = 0x00000001u,
//! Read-only (.text and .data sections).
kFlagConst = 0x00000002u,
//! Zero initialized by the loader (BSS).
kFlagZero = 0x00000004u,
//! Info / comment flag.
kFlagInfo = 0x00000008u,
//! Section created implicitly and can be deleted by \ref Target.
kFlagImplicit = 0x80000000u
};
//! \name Accessors
//! \{
//! Returns the section id.
inline uint32_t id() const noexcept { return _id; }
//! Returns the section name, as a null terminated string.
inline const char* name() const noexcept { return _name.str; }
//! Returns the section data.
inline uint8_t* data() noexcept { return _buffer.data(); }
//! \overload
inline const uint8_t* data() const noexcept { return _buffer.data(); }
//! Returns the section flags, see \ref Flags.
inline uint32_t flags() const noexcept { return _flags; }
//! Tests whether the section has the given `flag`.
inline bool hasFlag(uint32_t flag) const noexcept { return (_flags & flag) != 0; }
//! Adds `flags` to the section flags.
inline void addFlags(uint32_t flags) noexcept { _flags |= flags; }
//! Removes `flags` from the section flags.
inline void clearFlags(uint32_t flags) noexcept { _flags &= ~flags; }
//! Returns the minimum section alignment
inline uint32_t alignment() const noexcept { return _alignment; }
//! Sets the minimum section alignment
inline void setAlignment(uint32_t alignment) noexcept { _alignment = alignment; }
//! Returns the section order, which has a higher priority than section id.
inline int32_t order() const noexcept { return _order; }
//! Returns the section offset, relative to base.
inline uint64_t offset() const noexcept { return _offset; }
//! Set the section offset.
inline void setOffset(uint64_t offset) noexcept { _offset = offset; }
//! Returns the virtual size of the section.
//!
//! Virtual size is initially zero and is never changed by AsmJit. It's normal
//! if virtual size is smaller than size returned by `bufferSize()` as the buffer
//! stores real data emitted by assemblers or appended by users.
//!
//! Use `realSize()` to get the real and final size of this section.
inline uint64_t virtualSize() const noexcept { return _virtualSize; }
//! Sets the virtual size of the section.
inline void setVirtualSize(uint64_t virtualSize) noexcept { _virtualSize = virtualSize; }
//! Returns the buffer size of the section.
inline size_t bufferSize() const noexcept { return _buffer.size(); }
//! Returns the real size of the section calculated from virtual and buffer sizes.
inline uint64_t realSize() const noexcept { return Support::max<uint64_t>(virtualSize(), bufferSize()); }
//! Returns the `CodeBuffer` used by this section.
inline CodeBuffer& buffer() noexcept { return _buffer; }
//! Returns the `CodeBuffer` used by this section (const).
inline const CodeBuffer& buffer() const noexcept { return _buffer; }
//! \}
};
// ============================================================================
// [asmjit::OffsetFormat]
// ============================================================================
//! Provides information about formatting offsets, absolute addresses, or their
//! parts. Offset format is used by both \ref RelocEntry and \ref LabelLink.
//!
//! The illustration above describes the relation of region size and offset size.
//! Region size is the size of the whole unit whereas offset size is the size of
//! the unit that will be patched.
//!
//! ```
//! +-> Code buffer | The subject of the relocation (region) |
//! | | (Word-Offset) (Word-Size) |
//! |xxxxxxxxxxxxxxx|................|*PATCHED*|................|xxxxxxxxxxxx->
//! | |
//! [Word Offset points here]----+ +--- [WordOffset + WordSize]
//! ```
//!
//! Once the offset word has been located it can be patched like this:
//!
//! ```
//! |ImmDiscardLSB (discard LSB bits).
//! |..
//! [0000000000000iiiiiiiiiiiiiiiiiDD] - Offset value (32-bit)
//! [000000000000000iiiiiiiiiiiiiiiii] - Offset value after discard LSB.
//! [00000000000iiiiiiiiiiiiiiiii0000] - Offset value shifted by ImmBitShift.
//! [xxxxxxxxxxxiiiiiiiiiiiiiiiiixxxx] - Patched word (32-bit)
//! |...............|
//! (ImmBitCount) +- ImmBitShift
//! ```
struct OffsetFormat {
//! Type of the displacement.
uint8_t _type;
//! Encoding flags.
uint8_t _flags;
//! Size of the region (in bytes) containing the offset value, if the offset
//! value is part of an instruction, otherwise it would be the same as
//! `_valueSize`.
uint8_t _regionSize;
//! Size of the offset value, in bytes (1, 2, 4, or 8).
uint8_t _valueSize;
//! Offset of the offset value, in bytes, relative to the start of the region
//! or data. Value offset would be zero if both region size and value size are
//! equal.
uint8_t _valueOffset;
//! Size of the displacement immediate value in bits.
uint8_t _immBitCount;
//! Shift of the displacement immediate value in bits in the target word.
uint8_t _immBitShift;
//! Number of least significant bits to discard before writing the immediate
//! to the destination. All discarded bits must be zero otherwise the value
//! is invalid.
uint8_t _immDiscardLsb;
//! Type of the displacement.
enum Type : uint8_t {
//! A value having `_immBitCount` bits and shifted by `_immBitShift`.
//!
//! This displacement type is sufficient for both X86/X64 and many other
//! architectures that store displacement as continuous bits within a machine
//! word.
kTypeCommon = 0,
//! AARCH64 ADR format of `[.|immlo:2|.....|immhi:19|.....]`.
kTypeAArch64_ADR,
//! AARCH64 ADRP format of `[.|immlo:2|.....|immhi:19|.....]` (4kB pages).
kTypeAArch64_ADRP,
//! Count of displacement types.
kTypeCount
};
//! Returns the type of the displacement.
inline uint32_t type() const noexcept { return _type; }
//! Returns flags.
inline uint32_t flags() const noexcept { return _flags; }
//! Returns the size of the region/instruction where the displacement is encoded.
inline uint32_t regionSize() const noexcept { return _regionSize; }
//! Returns the the offset of the word relative to the start of the region
//! where the displacement is.
inline uint32_t valueOffset() const noexcept { return _valueOffset; }
//! Returns the size of the data-type (word) that contains the displacement, in bytes.
inline uint32_t valueSize() const noexcept { return _valueSize; }
//! Returns the count of bits of the displacement value in the data it's stored in.
inline uint32_t immBitCount() const noexcept { return _immBitCount; }
//! Returns the bit-shift of the displacement value in the data it's stored in.
inline uint32_t immBitShift() const noexcept { return _immBitShift; }
//! Returns the number of least significant bits of the displacement value,
//! that must be zero and that are not part of the encoded data.
inline uint32_t immDiscardLsb() const noexcept { return _immDiscardLsb; }
//! Resets this offset format to a simple data value of `dataSize` bytes.
//!
//! The region will be the same size as data and immediate bits would correspond
//! to `dataSize * 8`. There will be no immediate bit shift or discarded bits.
inline void resetToDataValue(size_t dataSize) noexcept {
ASMJIT_ASSERT(dataSize <= 8u);
_type = uint8_t(kTypeCommon);
_flags = uint8_t(0);
_regionSize = uint8_t(dataSize);
_valueSize = uint8_t(dataSize);
_valueOffset = uint8_t(0);
_immBitCount = uint8_t(dataSize * 8u);
_immBitShift = uint8_t(0);
_immDiscardLsb = uint8_t(0);
}
inline void resetToImmValue(uint32_t type, size_t valueSize, uint32_t immBitShift, uint32_t immBitCount, uint32_t immDiscardLsb) noexcept {
ASMJIT_ASSERT(valueSize <= 8u);
ASMJIT_ASSERT(immBitShift < valueSize * 8u);
ASMJIT_ASSERT(immBitCount <= 64u);
ASMJIT_ASSERT(immDiscardLsb <= 64u);
_type = uint8_t(type);
_flags = uint8_t(0);
_regionSize = uint8_t(valueSize);
_valueSize = uint8_t(valueSize);
_valueOffset = uint8_t(0);
_immBitCount = uint8_t(immBitCount);
_immBitShift = uint8_t(immBitShift);
_immDiscardLsb = uint8_t(immDiscardLsb);
}
inline void setRegion(size_t regionSize, size_t valueOffset) noexcept {
_regionSize = uint8_t(regionSize);
_valueOffset = uint8_t(valueOffset);
}
inline void setLeadingAndTrailingSize(size_t leadingSize, size_t trailingSize) noexcept {
_regionSize = uint8_t(leadingSize + trailingSize + _valueSize);
_valueOffset = uint8_t(leadingSize);
}
};
// ============================================================================
// [asmjit::RelocEntry]
// ============================================================================
//! Relocation entry.
struct RelocEntry {
//! Relocation id.
uint32_t _id;
//! Type of the relocation.
uint32_t _relocType;
//! Format of the relocated value.
OffsetFormat _format;
//! Source section id.
uint32_t _sourceSectionId;
//! Target section id.
uint32_t _targetSectionId;
//! Source offset (relative to start of the section).
uint64_t _sourceOffset;
//! Payload (target offset, target address, expression, etc).
uint64_t _payload;
//! Relocation type.
enum RelocType : uint32_t {
//! None/deleted (no relocation).
kTypeNone = 0,
//! Expression evaluation, `_payload` is pointer to `Expression`.
kTypeExpression = 1,
//! Relocate absolute to absolute.
kTypeAbsToAbs = 2,
//! Relocate relative to absolute.
kTypeRelToAbs = 3,
//! Relocate absolute to relative.
kTypeAbsToRel = 4,
//! Relocate absolute to relative or use trampoline.
kTypeX64AddressEntry = 5
};
//! \name Accessors
//! \{
inline uint32_t id() const noexcept { return _id; }
inline uint32_t relocType() const noexcept { return _relocType; }
inline const OffsetFormat& format() const noexcept { return _format; }
inline uint32_t sourceSectionId() const noexcept { return _sourceSectionId; }
inline uint32_t targetSectionId() const noexcept { return _targetSectionId; }
inline uint64_t sourceOffset() const noexcept { return _sourceOffset; }
inline uint64_t payload() const noexcept { return _payload; }
Expression* payloadAsExpression() const noexcept {
return reinterpret_cast<Expression*>(uintptr_t(_payload));
}
//! \}
};
// ============================================================================
// [asmjit::LabelLink]
// ============================================================================
//! Data structure used to link either unbound labels or cross-section links.
struct LabelLink {
//! Next link (single-linked list).
LabelLink* next;
//! Section id where the label is bound.
uint32_t sectionId;
//! Relocation id or Globals::kInvalidId.
uint32_t relocId;
//! Label offset relative to the start of the section.
size_t offset;
//! Inlined rel8/rel32.
intptr_t rel;
//! Offset format information.
OffsetFormat format;
};
// ============================================================================
// [asmjit::LabelEntry]
// ============================================================================
//! Label entry.
//!
//! Contains the following properties:
//! * Label id - This is the only thing that is set to the `Label` operand.
//! * Label name - Optional, used mostly to create executables and libraries.
//! * Label type - Type of the label, default `Label::kTypeAnonymous`.
//! * Label parent id - Derived from many assemblers that allow to define a
//! local label that falls under a global label. This allows to define
//! many labels of the same name that have different parent (global) label.
//! * Offset - offset of the label bound by `Assembler`.
//! * Links - single-linked list that contains locations of code that has
//! to be patched when the label gets bound. Every use of unbound label
//! adds one link to `_links` list.
//! * HVal - Hash value of label's name and optionally parentId.
//! * HashNext - Hash-table implementation detail.
class LabelEntry : public ZoneHashNode {
public:
// Let's round the size of `LabelEntry` to 64 bytes (as `ZoneAllocator` has
// granularity of 32 bytes anyway). This gives `_name` the remaining space,
// which is should be 16 bytes on 64-bit and 28 bytes on 32-bit architectures.
enum : uint32_t {
kStaticNameSize =
64 - (sizeof(ZoneHashNode) + 8 + sizeof(Section*) + sizeof(size_t) + sizeof(LabelLink*))
};
//! Label type, see `Label::LabelType`.
uint8_t _type;
//! Must be zero.
uint8_t _flags;
//! Reserved.
uint16_t _reserved16;
//! Label parent id or zero.
uint32_t _parentId;
//! Label offset relative to the start of the `_section`.
uint64_t _offset;
//! Section where the label was bound.
Section* _section;
//! Label links.
LabelLink* _links;
//! Label name.
ZoneString<kStaticNameSize> _name;
//! \name Accessors
//! \{
// NOTE: Label id is stored in `_customData`, which is provided by ZoneHashNode
// to fill a padding that a C++ compiler targeting 64-bit CPU will add to align
// the structure to 64-bits.
//! Returns label id.
inline uint32_t id() const noexcept { return _customData; }
//! Sets label id (internal, used only by `CodeHolder`).
inline void _setId(uint32_t id) noexcept { _customData = id; }
//! Returns label type, see `Label::LabelType`.
inline uint32_t type() const noexcept { return _type; }
//! Returns label flags, returns 0 at the moment.
inline uint32_t flags() const noexcept { return _flags; }
//! Tests whether the label has a parent label.
inline bool hasParent() const noexcept { return _parentId != Globals::kInvalidId; }
//! Returns label's parent id.
inline uint32_t parentId() const noexcept { return _parentId; }
//! Returns the section where the label was bound.
//!
//! If the label was not yet bound the return value is `nullptr`.
inline Section* section() const noexcept { return _section; }
//! Tests whether the label has name.
inline bool hasName() const noexcept { return !_name.empty(); }
//! Returns the label's name.
//!
//! \note Local labels will return their local name without their parent
//! part, for example ".L1".
inline const char* name() const noexcept { return _name.data(); }
//! Returns size of label's name.
//!
//! \note Label name is always null terminated, so you can use `strlen()` to
//! get it, however, it's also cached in `LabelEntry` itself, so if you want
//! to know the size the fastest way is to call `LabelEntry::nameSize()`.
inline uint32_t nameSize() const noexcept { return _name.size(); }
//! Returns links associated with this label.
inline LabelLink* links() const noexcept { return _links; }
//! Tests whether the label is bound.
inline bool isBound() const noexcept { return _section != nullptr; }
//! Tests whether the label is bound to a the given `sectionId`.
inline bool isBoundTo(Section* section) const noexcept { return _section == section; }
//! Returns the label offset (only useful if the label is bound).
inline uint64_t offset() const noexcept { return _offset; }
//! Returns the hash-value of label's name and its parent label (if any).
//!
//! Label hash is calculated as `HASH(Name) ^ ParentId`. The hash function
//! is implemented in `Support::hashString()` and `Support::hashRound()`.
inline uint32_t hashCode() const noexcept { return _hashCode; }
//! \}
};
// ============================================================================
// [asmjit::AddressTableEntry]
// ============================================================================
//! Entry in an address table.
class AddressTableEntry : public ZoneTreeNodeT<AddressTableEntry> {
public:
ASMJIT_NONCOPYABLE(AddressTableEntry)
//! Address.
uint64_t _address;
//! Slot.
uint32_t _slot;
//! \name Construction & Destruction
//! \{
inline explicit AddressTableEntry(uint64_t address) noexcept
: _address(address),
_slot(0xFFFFFFFFu) {}
//! \}
//! \name Accessors
//! \{
inline uint64_t address() const noexcept { return _address; }
inline uint32_t slot() const noexcept { return _slot; }
inline bool hasAssignedSlot() const noexcept { return _slot != 0xFFFFFFFFu; }
inline bool operator<(const AddressTableEntry& other) const noexcept { return _address < other._address; }
inline bool operator>(const AddressTableEntry& other) const noexcept { return _address > other._address; }
inline bool operator<(uint64_t queryAddress) const noexcept { return _address < queryAddress; }
inline bool operator>(uint64_t queryAddress) const noexcept { return _address > queryAddress; }
//! \}
};
// ============================================================================
// [asmjit::CodeHolder]
// ============================================================================
//! Contains basic information about the target architecture and its options.
//!
//! In addition, it holds assembled code & data (including sections, labels, and
//! relocation information). `CodeHolder` can store both binary and intermediate
//! representation of assembly, which can be generated by \ref BaseAssembler,
//! \ref BaseBuilder, and \ref BaseCompiler
//!
//! \note `CodeHolder` has an ability to attach an \ref ErrorHandler, however,
//! the error handler is not triggered by `CodeHolder` itself, it's instead
//! propagated to all emitters that attach to it.
class CodeHolder {
public:
ASMJIT_NONCOPYABLE(CodeHolder)
//! Environment information.
Environment _environment;
//! Base address or \ref Globals::kNoBaseAddress.
uint64_t _baseAddress;
//! Attached `Logger`, used by all consumers.
Logger* _logger;
//! Attached `ErrorHandler`.
ErrorHandler* _errorHandler;
//! Code zone (used to allocate core structures).
Zone _zone;
//! Zone allocator, used to manage internal containers.
ZoneAllocator _allocator;
//! Attached emitters.
ZoneVector<BaseEmitter*> _emitters;
//! Section entries.
ZoneVector<Section*> _sections;
//! Section entries sorted by section order and then section id.
ZoneVector<Section*> _sectionsByOrder;
//! Label entries.
ZoneVector<LabelEntry*> _labelEntries;
//! Relocation entries.
ZoneVector<RelocEntry*> _relocations;
//! Label name -> LabelEntry (only named labels).
ZoneHash<LabelEntry> _namedLabels;
//! Count of label links, which are not resolved.
size_t _unresolvedLinkCount;
//! Pointer to an address table section (or null if this section doesn't exist).
Section* _addressTableSection;
//! Address table entries.
ZoneTree<AddressTableEntry> _addressTableEntries;
//! Options that can be used with \ref copySectionData() and \ref copyFlattenedData().
enum CopyOptions : uint32_t {
//! If virtual size of a section is greater than the size of its \ref CodeBuffer
//! then all bytes between the buffer size and virtual size will be zeroed.
//! If this option is not set then those bytes would be left as is, which
//! means that if the user didn't initialize them they would have a previous
//! content, which may be unwanted.
kCopyPadSectionBuffer = 0x00000001u,
#ifndef ASMJIT_NO_DEPRECATED
kCopyWithPadding = kCopyPadSectionBuffer,
#endif // !ASMJIT_NO_DEPRECATED
//! Zeroes the target buffer if the flattened data is less than the destination
//! size. This option works only with \ref copyFlattenedData() as it processes
//! multiple sections. It is ignored by \ref copySectionData().
kCopyPadTargetBuffer = 0x00000002u
};
//! \name Construction & Destruction
//! \{
//! Creates an uninitialized CodeHolder (you must init() it before it can be used).
ASMJIT_API CodeHolder() noexcept;
//! Destroys the CodeHolder.
ASMJIT_API ~CodeHolder() noexcept;
//! Tests whether the `CodeHolder` has been initialized.
//!
//! Emitters can be only attached to initialized `CodeHolder` instances.
inline bool isInitialized() const noexcept { return _environment.isInitialized(); }
//! Initializes CodeHolder to hold code described by code `info`.
ASMJIT_API Error init(const Environment& environment, uint64_t baseAddress = Globals::kNoBaseAddress) noexcept;
//! Detaches all code-generators attached and resets the `CodeHolder`.
ASMJIT_API void reset(uint32_t resetPolicy = Globals::kResetSoft) noexcept;
//! \}
//! \name Attach & Detach
//! \{
//! Attaches an emitter to this `CodeHolder`.
ASMJIT_API Error attach(BaseEmitter* emitter) noexcept;
//! Detaches an emitter from this `CodeHolder`.
ASMJIT_API Error detach(BaseEmitter* emitter) noexcept;
//! \}
//! \name Allocators
//! \{
//! Returns the allocator that the `CodeHolder` uses.
//!
//! \note This should be only used for AsmJit's purposes. Code holder uses
//! arena allocator to allocate everything, so anything allocated through
//! this allocator will be invalidated by \ref CodeHolder::reset() or by
//! CodeHolder's destructor.
inline ZoneAllocator* allocator() const noexcept { return const_cast<ZoneAllocator*>(&_allocator); }
//! \}
//! \name Code & Architecture
//! \{
//! Returns the target environment information, see \ref Environment.
inline const Environment& environment() const noexcept { return _environment; }
//! Returns the target architecture.
inline uint32_t arch() const noexcept { return environment().arch(); }
//! Returns the target sub-architecture.
inline uint32_t subArch() const noexcept { return environment().subArch(); }
//! Tests whether a static base-address is set.
inline bool hasBaseAddress() const noexcept { return _baseAddress != Globals::kNoBaseAddress; }
//! Returns a static base-address or \ref Globals::kNoBaseAddress, if not set.
inline uint64_t baseAddress() const noexcept { return _baseAddress; }
//! \}
//! \name Emitters
//! \{
//! Returns a vector of attached emitters.
inline const ZoneVector<BaseEmitter*>& emitters() const noexcept { return _emitters; }
//! \}
//! \name Logging
//! \{
//! Returns the attached logger, see \ref Logger.
inline Logger* logger() const noexcept { return _logger; }
//! Attaches a `logger` to CodeHolder and propagates it to all attached emitters.
ASMJIT_API void setLogger(Logger* logger) noexcept;
//! Resets the logger to none.
inline void resetLogger() noexcept { setLogger(nullptr); }
//! \name Error Handling
//! \{
//! Tests whether the CodeHolder has an attached error handler, see \ref ErrorHandler.
inline bool hasErrorHandler() const noexcept { return _errorHandler != nullptr; }
//! Returns the attached error handler.
inline ErrorHandler* errorHandler() const noexcept { return _errorHandler; }
//! Attach an error handler to this `CodeHolder`.
ASMJIT_API void setErrorHandler(ErrorHandler* errorHandler) noexcept;
//! Resets the error handler to none.
inline void resetErrorHandler() noexcept { setErrorHandler(nullptr); }
//! \}
//! \name Code Buffer
//! \{
//! Makes sure that at least `n` bytes can be added to CodeHolder's buffer `cb`.
//!
//! \note The buffer `cb` must be managed by `CodeHolder` - otherwise the
//! behavior of the function is undefined.
ASMJIT_API Error growBuffer(CodeBuffer* cb, size_t n) noexcept;
//! Reserves the size of `cb` to at least `n` bytes.
//!
//! \note The buffer `cb` must be managed by `CodeHolder` - otherwise the
//! behavior of the function is undefined.
ASMJIT_API Error reserveBuffer(CodeBuffer* cb, size_t n) noexcept;
//! \}
//! \name Sections
//! \{
//! Returns an array of `Section*` records.
inline const ZoneVector<Section*>& sections() const noexcept { return _sections; }
//! Returns an array of `Section*` records sorted according to section order first, then section id.
inline const ZoneVector<Section*>& sectionsByOrder() const noexcept { return _sectionsByOrder; }
//! Returns the number of sections.
inline uint32_t sectionCount() const noexcept { return _sections.size(); }
//! Tests whether the given `sectionId` is valid.
inline bool isSectionValid(uint32_t sectionId) const noexcept { return sectionId < _sections.size(); }
//! Creates a new section and return its pointer in `sectionOut`.
//!
//! Returns `Error`, does not report a possible error to `ErrorHandler`.
ASMJIT_API Error newSection(Section** sectionOut, const char* name, size_t nameSize = SIZE_MAX, uint32_t flags = 0, uint32_t alignment = 1, int32_t order = 0) noexcept;
//! Returns a section entry of the given index.
inline Section* sectionById(uint32_t sectionId) const noexcept { return _sections[sectionId]; }
//! Returns section-id that matches the given `name`.
//!
//! If there is no such section `Section::kInvalidId` is returned.
ASMJIT_API Section* sectionByName(const char* name, size_t nameSize = SIZE_MAX) const noexcept;
//! Returns '.text' section (section that commonly represents code).
//!
//! \note Text section is always the first section in \ref CodeHolder::sections() array.
inline Section* textSection() const noexcept { return _sections[0]; }
//! Tests whether '.addrtab' section exists.
inline bool hasAddressTable() const noexcept { return _addressTableSection != nullptr; }
//! Returns '.addrtab' section.
//!
//! This section is used exclusively by AsmJit to store absolute 64-bit
//! addresses that cannot be encoded in instructions like 'jmp' or 'call'.
//!
//! \note This section is created on demand, the returned pointer can be null.
inline Section* addressTableSection() const noexcept { return _addressTableSection; }
//! Ensures that '.addrtab' section exists (creates it if it doesn't) and
//! returns it. Can return `nullptr` on out of memory condition.
ASMJIT_API Section* ensureAddressTableSection() noexcept;
//! Used to add an address to an address table.
//!
//! This implicitly calls `ensureAddressTableSection()` and then creates
//! `AddressTableEntry` that is inserted to `_addressTableEntries`. If the
//! address already exists this operation does nothing as the same addresses
//! use the same slot.
//!
//! This function should be considered internal as it's used by assemblers to
//! insert an absolute address into the address table. Inserting address into
//! address table without creating a particula relocation entry makes no sense.
ASMJIT_API Error addAddressToAddressTable(uint64_t address) noexcept;
//! \}
//! \name Labels & Symbols
//! \{
//! Returns array of `LabelEntry*` records.
inline const ZoneVector<LabelEntry*>& labelEntries() const noexcept { return _labelEntries; }
//! Returns number of labels created.
inline uint32_t labelCount() const noexcept { return _labelEntries.size(); }
//! Tests whether the label having `id` is valid (i.e. created by `newLabelEntry()`).
inline bool isLabelValid(uint32_t labelId) const noexcept {
return labelId < _labelEntries.size();
}
//! Tests whether the `label` is valid (i.e. created by `newLabelEntry()`).
inline bool isLabelValid(const Label& label) const noexcept {
return label.id() < _labelEntries.size();
}
//! \overload
inline bool isLabelBound(uint32_t labelId) const noexcept {
return isLabelValid(labelId) && _labelEntries[labelId]->isBound();
}
//! Tests whether the `label` is already bound.
//!
//! Returns `false` if the `label` is not valid.
inline bool isLabelBound(const Label& label) const noexcept {
return isLabelBound(label.id());
}
//! Returns LabelEntry of the given label `id`.
inline LabelEntry* labelEntry(uint32_t labelId) const noexcept {
return isLabelValid(labelId) ? _labelEntries[labelId] : static_cast<LabelEntry*>(nullptr);
}
//! Returns LabelEntry of the given `label`.
inline LabelEntry* labelEntry(const Label& label) const noexcept {
return labelEntry(label.id());
}
//! Returns offset of a `Label` by its `labelId`.
//!
//! The offset returned is relative to the start of the section. Zero offset
//! is returned for unbound labels, which is their initial offset value.
inline uint64_t labelOffset(uint32_t labelId) const noexcept {
ASMJIT_ASSERT(isLabelValid(labelId));
return _labelEntries[labelId]->offset();
}
//! \overload
inline uint64_t labelOffset(const Label& label) const noexcept {
return labelOffset(label.id());
}
//! Returns offset of a label by it's `labelId` relative to the base offset.
//!
//! \remarks The offset of the section where the label is bound must be valid
//! in order to use this function, otherwise the value returned will not be
//! reliable.
inline uint64_t labelOffsetFromBase(uint32_t labelId) const noexcept {
ASMJIT_ASSERT(isLabelValid(labelId));
const LabelEntry* le = _labelEntries[labelId];
return (le->isBound() ? le->section()->offset() : uint64_t(0)) + le->offset();
}
//! \overload
inline uint64_t labelOffsetFromBase(const Label& label) const noexcept {
return labelOffsetFromBase(label.id());
}
//! Creates a new anonymous label and return its id in `idOut`.
//!
//! Returns `Error`, does not report error to `ErrorHandler`.
ASMJIT_API Error newLabelEntry(LabelEntry** entryOut) noexcept;
//! Creates a new named \ref LabelEntry of the given label `type`.
//!
//! \param entryOut Where to store the created \ref LabelEntry.
//! \param name The name of the label.
//! \param nameSize The length of `name` argument, or `SIZE_MAX` if `name` is
//! a null terminated string, which means that the `CodeHolder` will
//! use `strlen()` to determine the length.
//! \param type The type of the label to create, see \ref Label::LabelType.
//! \param parentId Parent id of a local label, otherwise it must be
//! \ref Globals::kInvalidId.
//!
//! \retval Always returns \ref Error, does not report a possible error to
//! the attached \ref ErrorHandler.
//!
//! AsmJit has a support for local labels (\ref Label::kTypeLocal) which
//! require a parent label id (parentId). The names of local labels can
//! conflict with names of other local labels that have a different parent.
ASMJIT_API Error newNamedLabelEntry(LabelEntry** entryOut, const char* name, size_t nameSize, uint32_t type, uint32_t parentId = Globals::kInvalidId) noexcept;
//! Returns a label by name.
//!
//! If the named label doesn't a default constructed \ref Label is returned,
//! which has its id set to \ref Globals::kInvalidId.
inline Label labelByName(const char* name, size_t nameSize = SIZE_MAX, uint32_t parentId = Globals::kInvalidId) noexcept {
return Label(labelIdByName(name, nameSize, parentId));
}
//! Returns a label id by name.
//!
//! If the named label doesn't exist \ref Globals::kInvalidId is returned.
ASMJIT_API uint32_t labelIdByName(const char* name, size_t nameSize = SIZE_MAX, uint32_t parentId = Globals::kInvalidId) noexcept;
//! Tests whether there are any unresolved label links.
inline bool hasUnresolvedLinks() const noexcept { return _unresolvedLinkCount != 0; }
//! Returns the number of label links, which are unresolved.
inline size_t unresolvedLinkCount() const noexcept { return _unresolvedLinkCount; }
//! Creates a new label-link used to store information about yet unbound labels.
//!
//! Returns `null` if the allocation failed.
ASMJIT_API LabelLink* newLabelLink(LabelEntry* le, uint32_t sectionId, size_t offset, intptr_t rel, const OffsetFormat& format) noexcept;
//! Resolves cross-section links (`LabelLink`) associated with each label that
//! was used as a destination in code of a different section. It's only useful
//! to people that use multiple sections as it will do nothing if the code only
//! contains a single section in which cross-section links are not possible.
ASMJIT_API Error resolveUnresolvedLinks() noexcept;
//! Binds a label to a given `sectionId` and `offset` (relative to start of the section).
//!
//! This function is generally used by `BaseAssembler::bind()` to do the heavy lifting.
ASMJIT_API Error bindLabel(const Label& label, uint32_t sectionId, uint64_t offset) noexcept;
//! \}
//! \name Relocations
//! \{
//! Tests whether the code contains relocation entries.
inline bool hasRelocEntries() const noexcept { return !_relocations.empty(); }
//! Returns array of `RelocEntry*` records.
inline const ZoneVector<RelocEntry*>& relocEntries() const noexcept { return _relocations; }
//! Returns a RelocEntry of the given `id`.
inline RelocEntry* relocEntry(uint32_t id) const noexcept { return _relocations[id]; }
//! Creates a new relocation entry of type `relocType`.
//!
//! Additional fields can be set after the relocation entry was created.
ASMJIT_API Error newRelocEntry(RelocEntry** dst, uint32_t relocType) noexcept;
//! \}
//! \name Utilities
//! \{
//! Flattens all sections by recalculating their offsets, starting at 0.
//!
//! \note This should never be called more than once.
ASMJIT_API Error flatten() noexcept;
//! Returns computed the size of code & data of all sections.
//!
//! \note All sections will be iterated over and the code size returned
//! would represent the minimum code size of all combined sections after
//! applying minimum alignment. Code size may decrease after calling
//! `flatten()` and `relocateToBase()`.
ASMJIT_API size_t codeSize() const noexcept;
//! Relocates the code to the given `baseAddress`.
//!
//! \param baseAddress Absolute base address where the code will be relocated
//! to. Please note that nothing is copied to such base address, it's just an
//! absolute value used by the relocator to resolve all stored relocations.
//!
//! \note This should never be called more than once.
ASMJIT_API Error relocateToBase(uint64_t baseAddress) noexcept;
//! Copies a single section into `dst`.
ASMJIT_API Error copySectionData(void* dst, size_t dstSize, uint32_t sectionId, uint32_t copyOptions = 0) noexcept;
//! Copies all sections into `dst`.
//!
//! This should only be used if the data was flattened and there are no gaps
//! between the sections. The `dstSize` is always checked and the copy will
//! never write anything outside the provided buffer.
ASMJIT_API Error copyFlattenedData(void* dst, size_t dstSize, uint32_t copyOptions = 0) noexcept;
//! \}
#ifndef ASMJIT_NO_DEPRECATED
ASMJIT_DEPRECATED("Use 'CodeHolder::init(const Environment& environment, uint64_t baseAddress)' instead")
inline Error init(const CodeInfo& codeInfo) noexcept { return init(codeInfo._environment, codeInfo._baseAddress); }
ASMJIT_DEPRECATED("Use nevironment() instead")
inline CodeInfo codeInfo() const noexcept { return CodeInfo(_environment, _baseAddress); }
ASMJIT_DEPRECATED("Use BaseEmitter::encodingOptions() - this function always returns zero")
inline uint32_t emitterOptions() const noexcept { return 0; }
ASMJIT_DEPRECATED("Use BaseEmitter::addEncodingOptions() - this function does nothing")
inline void addEmitterOptions(uint32_t options) noexcept { DebugUtils::unused(options); }
ASMJIT_DEPRECATED("Use BaseEmitter::clearEncodingOptions() - this function does nothing")
inline void clearEmitterOptions(uint32_t options) noexcept { DebugUtils::unused(options); }
#endif // !ASMJIT_NO_DEPRECATED
};
//! \}
ASMJIT_END_NAMESPACE
#endif // ASMJIT_CORE_CODEHOLDER_H_INCLUDED