AsmJit
Low-Latency Machine Code Generation
asmjit::ArchTraits Struct Reference [¶]
Architecture traits used by Function API and Compiler's register allocator.
Public Members
Members
uint8_t _spRegId
uint8_t _fpRegId
uint8_t _linkRegId
uint8_t _pcRegId
uint8_t _hwStackAlignment
uint32_t _minStackOffset
uint32_t _maxStackOffset
uint32_t _supportedRegTypes
Member Functions
Accessors
uint32_t ArchTraits::spRegId() constnoexcept[¶]
Returns stack pointer register id (always GP register).
uint32_t ArchTraits::fpRegId() constnoexcept[¶]
Returns stack frame register id (always GP register).
uint32_t ArchTraits::linkRegId() constnoexcept[¶]
Returns link register id, if the architecture provides it (always GP register).
uint32_t ArchTraits::pcRegId() constnoexcept[¶]
Returns program counter register id, if the architecture exposes it (always GP register).
uint32_t ArchTraits::hwStackAlignment() constnoexcept[¶]
Returns a hardware stack alignment requirement.
- Note
- This is a hardware constraint. Architectures that don't constrain it would return the lowest alignment (1), however, some architectures may constrain the alignment, for example AArch64 requires 16-byte alignment.
bool ArchTraits::hasLinkReg() constnoexcept[¶]
Tests whether the architecture provides link register, which is used across function calls.
If the link register is not provided then a function call pushes the return address on stack (X86/X64).
uint32_t ArchTraits::minStackOffset() constnoexcept[¶]
Returns minimum addressable offset on stack guaranteed for all instructions.
uint32_t ArchTraits::maxStackOffset() constnoexcept[¶]
Returns maximum addressable offset on stack depending on specific instruction.
InstHints ArchTraits::instFeatureHints(RegGroup group) constnoexcept[¶]
Returns ISA flags of the given register group.
bool ArchTraits::hasInstHint(RegGroup group, InstHints feature) constnoexcept[¶]
Tests whether the given register group has the given flag set.
bool ArchTraits::hasInstRegSwap(RegGroup group) constnoexcept[¶]
Tests whether the ISA provides register swap instruction for the given register group.
bool ArchTraits::hasInstPushPop(RegGroup group) constnoexcept[¶]
Tests whether the ISA provides push/pop instructions for the given register group.
const ArchTypeNameId* ArchTraits::typeNameIdTable() constnoexcept[¶]
Returns a table of ISA word names that appear in formatted text.
Word names are ISA dependent.
The index of this table is log2 of the size:
- [0] 8-bits
- [1] 16-bits
- [2] 32-bits
- [3] 64-bits
ArchTypeNameId ArchTraits::typeNameIdByIndex(uint32_t index) constnoexcept[¶]
Returns an ISA word name identifier of the given index, see typeNameIdTable() for more details.
const ArchTraits& ArchTraits::byArch(Arch arch)staticnoexcept[¶]
Returns a const reference to ArchTraits for the given architecture arch.
uint8_t ArchTraits::_spRegId[¶]
Stack pointer register id.
uint8_t ArchTraits::_fpRegId[¶]
Frame pointer register id.
uint8_t ArchTraits::_linkRegId[¶]
Link register id.
uint8_t ArchTraits::_pcRegId[¶]
Instruction pointer (or program counter) register id, if accessible.
uint8_t ArchTraits::_hwStackAlignment[¶]
Hardware stack alignment requirement.
uint32_t ArchTraits::_minStackOffset[¶]
Minimum addressable offset on stack guaranteed for all instructions.
uint32_t ArchTraits::_maxStackOffset[¶]
Maximum addressable offset on stack depending on specific instruction.
uint32_t ArchTraits::_supportedRegTypes[¶]
Bit-mask indexed by RegType that describes, which register types are supported by the ISA.
Support::Array<InstHints, Globals::kNumVirtGroups>ArchTraits::_instHints[¶]
Flags for each virtual register group.
Support::Array<RegType, 32>ArchTraits::_typeIdToRegType[¶]
Maps scalar TypeId values (from TypeId::_kIdBaseStart) to register types, see TypeId.
ArchTypeNameId ArchTraits::_typeNameIdTable[4][¶]
Word name identifiers of 8-bit, 16-bit, 32-bit, and 64-bit quantities that appear in formatted text.