LLVM: llvm::InlineAsm::ConstraintInfo Struct Reference (original) (raw)

#include "[llvm/IR/InlineAsm.h](InlineAsm%5F8h%5Fsource.html)"

Public Member Functions
bool hasMatchingInput () const
hasMatchingInput - Return true if this is an output constraint that has a matching input constraint.
ConstraintInfo ()=default
Default constructor.
LLVM_ABI bool Parse (StringRef Str, ConstraintInfoVector &ConstraintsSoFar)
Parse - Analyze the specified string (e.g.
LLVM_ABI void selectAlternative (unsigned index)
selectAlternative - Point this constraint to the alternative constraint indicated by the index.
bool hasArg () const
Whether this constraint corresponds to an argument.
Public Attributes
ConstraintPrefix Type = isInput
Type - The basic type of the constraint: input/output/clobber/label.
bool isEarlyClobber = false
isEarlyClobber - "&": output operand writes result before inputs are all read.
int MatchingInput = -1
MatchingInput - If this is not -1, this is an output constraint where an input constraint is required to match it (e.g.
bool isCommutative = false
isCommutative - This is set to true for a constraint that is commutative with the next operand.
bool isIndirect = false
isIndirect - True if this operand is an indirect operand.
ConstraintCodeVector Codes
Code - The constraint code, either the register name (in braces) or the constraint letter/number.
bool isMultipleAlternative = false
isMultipleAlternative - '|': has multiple-alternative constraints.
SubConstraintInfoVector multipleAlternatives
multipleAlternatives - If there are multiple alternative constraints, this array will contain them.
unsigned currentAlternativeIndex = 0
The currently selected alternative constraint index.

Definition at line 125 of file InlineAsm.h.

llvm::InlineAsm::ConstraintInfo::ConstraintInfo ( ) default

◆ hasArg()

bool llvm::InlineAsm::ConstraintInfo::hasArg ( ) const inline

◆ hasMatchingInput()

bool llvm::InlineAsm::ConstraintInfo::hasMatchingInput ( ) const inline

hasMatchingInput - Return true if this is an output constraint that has a matching input constraint.

Definition at line 142 of file InlineAsm.h.

References MatchingInput.

Referenced by Parse().

◆ Parse()

Parse - Analyze the specified string (e.g.

"=*&{eax}") and fill in the fields in this structure. If the constraint string is not understood, return true, otherwise return false.

"==&{eax}") and fill in the fields in this structure. If the constraint string is not understood, return true, otherwise return false.

Definition at line 79 of file InlineAsm.cpp.

References assert(), llvm::CallingConv::C, Codes, currentAlternativeIndex, hasMatchingInput(), I, llvm::InlineAsm::isClobber, isCommutative, isEarlyClobber, isIndirect, llvm::InlineAsm::isInput, llvm::InlineAsm::isLabel, isMultipleAlternative, llvm::InlineAsm::isOutput, MatchingInput, llvm::InlineAsm::SubConstraintInfo::MatchingInput, multipleAlternatives, N, and Type.

◆ selectAlternative()

void InlineAsm::ConstraintInfo::selectAlternative ( unsigned index )

◆ Codes

◆ currentAlternativeIndex

unsigned llvm::InlineAsm::ConstraintInfo::currentAlternativeIndex = 0

◆ isCommutative

bool llvm::InlineAsm::ConstraintInfo::isCommutative = false

isCommutative - This is set to true for a constraint that is commutative with the next operand.

Definition at line 146 of file InlineAsm.h.

Referenced by Parse().

◆ isEarlyClobber

bool llvm::InlineAsm::ConstraintInfo::isEarlyClobber = false

isEarlyClobber - "&": output operand writes result before inputs are all read.

This is only ever set for an output operand.

Definition at line 132 of file InlineAsm.h.

Referenced by Parse().

◆ isIndirect

bool llvm::InlineAsm::ConstraintInfo::isIndirect = false

isIndirect - True if this operand is an indirect operand.

This means that the address of the source or destination is present in the call instruction, instead of it being returned or passed in explicitly. This is represented with a '*' in the asm string.

Definition at line 152 of file InlineAsm.h.

Referenced by hasArg(), and Parse().

◆ isMultipleAlternative

bool llvm::InlineAsm::ConstraintInfo::isMultipleAlternative = false

isMultipleAlternative - '|': has multiple-alternative constraints.

Definition at line 159 of file InlineAsm.h.

Referenced by Parse().

◆ MatchingInput

int llvm::InlineAsm::ConstraintInfo::MatchingInput = -1

MatchingInput - If this is not -1, this is an output constraint where an input constraint is required to match it (e.g.

"0"). The value is the constraint number that matches this one (for example, if this is constraint #0 and constraint #4 has the value "0", this will be 4).

Definition at line 138 of file InlineAsm.h.

Referenced by hasMatchingInput(), Parse(), and selectAlternative().

◆ multipleAlternatives

multipleAlternatives - If there are multiple alternative constraints, this array will contain them.

Otherwise it will be empty.

Definition at line 163 of file InlineAsm.h.

Referenced by Parse(), and selectAlternative().

◆ Type

The documentation for this struct was generated from the following files: