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llvm::CCState Class Reference

CCState - This class holds information needed while lowering arguments and return values. More...

#include "llvm/CodeGen/CallingConvLower.h"

Inheritance diagram for llvm::CCState:
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Public Member Functions

 CCState (CallingConv::ID CC, bool isVarArg, MachineFunction &MF, SmallVectorImpl< CCValAssign > &locs, LLVMContext &C)
 
void addLoc (const CCValAssign &V)
 
LLVMContextgetContext () const
 
MachineFunctiongetMachineFunction () const
 
CallingConv::ID getCallingConv () const
 
bool isVarArg () const
 
unsigned getNextStackOffset () const
 getNextStackOffset - Return the next stack offset such that all stack slots satisfy their alignment requirements. More...
 
unsigned getAlignedCallFrameSize () const
 getAlignedCallFrameSize - Return the size of the call frame needed to be able to store all arguments and such that the alignment requirement of each of the arguments is satisfied. More...
 
bool isAllocated (unsigned Reg) const
 isAllocated - Return true if the specified register (or an alias) is allocated. More...
 
void AnalyzeFormalArguments (const SmallVectorImpl< ISD::InputArg > &Ins, CCAssignFn Fn)
 AnalyzeFormalArguments - Analyze an array of argument values, incorporating info about the formals into this state. More...
 
void AnalyzeArguments (const SmallVectorImpl< ISD::InputArg > &Ins, CCAssignFn Fn)
 The function will invoke AnalyzeFormalArguments. More...
 
void AnalyzeReturn (const SmallVectorImpl< ISD::OutputArg > &Outs, CCAssignFn Fn)
 AnalyzeReturn - Analyze the returned values of a return, incorporating info about the result values into this state. More...
 
bool CheckReturn (const SmallVectorImpl< ISD::OutputArg > &ArgsFlags, CCAssignFn Fn)
 CheckReturn - Analyze the return values of a function, returning true if the return can be performed without sret-demotion, and false otherwise. More...
 
void AnalyzeCallOperands (const SmallVectorImpl< ISD::OutputArg > &Outs, CCAssignFn Fn)
 AnalyzeCallOperands - Analyze the outgoing arguments to a call, incorporating info about the passed values into this state. More...
 
void AnalyzeCallOperands (SmallVectorImpl< MVT > &ArgVTs, SmallVectorImpl< ISD::ArgFlagsTy > &Flags, CCAssignFn Fn)
 AnalyzeCallOperands - Same as above except it takes vectors of types and argument flags. More...
 
void AnalyzeArguments (const SmallVectorImpl< ISD::OutputArg > &Outs, CCAssignFn Fn)
 The function will invoke AnalyzeCallOperands. More...
 
void AnalyzeCallResult (const SmallVectorImpl< ISD::InputArg > &Ins, CCAssignFn Fn)
 AnalyzeCallResult - Analyze the return values of a call, incorporating info about the passed values into this state. More...
 
bool IsShadowAllocatedReg (unsigned Reg) const
 A shadow allocated register is a register that was allocated but wasn't added to the location list (Locs). More...
 
void AnalyzeCallResult (MVT VT, CCAssignFn Fn)
 AnalyzeCallResult - Same as above except it's specialized for calls which produce a single value. More...
 
unsigned getFirstUnallocated (ArrayRef< MCPhysReg > Regs) const
 getFirstUnallocated - Return the index of the first unallocated register in the set, or Regs.size() if they are all allocated. More...
 
unsigned AllocateReg (unsigned Reg)
 AllocateReg - Attempt to allocate one register. More...
 
unsigned AllocateReg (unsigned Reg, unsigned ShadowReg)
 Version of AllocateReg with extra register to be shadowed. More...
 
unsigned AllocateReg (ArrayRef< MCPhysReg > Regs)
 AllocateReg - Attempt to allocate one of the specified registers. More...
 
unsigned AllocateRegBlock (ArrayRef< MCPhysReg > Regs, unsigned RegsRequired)
 AllocateRegBlock - Attempt to allocate a block of RegsRequired consecutive registers. More...
 
unsigned AllocateReg (ArrayRef< MCPhysReg > Regs, const MCPhysReg *ShadowRegs)
 Version of AllocateReg with list of registers to be shadowed. More...
 
unsigned AllocateStack (unsigned Size, unsigned Align)
 AllocateStack - Allocate a chunk of stack space with the specified size and alignment. More...
 
void ensureMaxAlignment (unsigned Align)
 
unsigned AllocateStack (unsigned Size, unsigned Align, unsigned ShadowReg)
 Version of AllocateStack with extra register to be shadowed. More...
 
unsigned AllocateStack (unsigned Size, unsigned Align, ArrayRef< MCPhysReg > ShadowRegs)
 Version of AllocateStack with list of extra registers to be shadowed. More...
 
void HandleByVal (unsigned ValNo, MVT ValVT, MVT LocVT, CCValAssign::LocInfo LocInfo, int MinSize, int MinAlign, ISD::ArgFlagsTy ArgFlags)
 Allocate space on the stack large enough to pass an argument by value. More...
 
unsigned getInRegsParamsCount () const
 
unsigned getInRegsParamsProcessed () const
 
void getInRegsParamInfo (unsigned InRegsParamRecordIndex, unsigned &BeginReg, unsigned &EndReg) const
 
void addInRegsParamInfo (unsigned RegBegin, unsigned RegEnd)
 
bool nextInRegsParam ()
 
void clearByValRegsInfo ()
 
void rewindByValRegsInfo ()
 
SmallVectorImpl< CCValAssign > & getPendingLocs ()
 
void getRemainingRegParmsForType (SmallVectorImpl< MCPhysReg > &Regs, MVT VT, CCAssignFn Fn)
 Compute the remaining unused register parameters that would be used for the given value type. More...
 
void analyzeMustTailForwardedRegisters (SmallVectorImpl< ForwardedRegister > &Forwards, ArrayRef< MVT > RegParmTypes, CCAssignFn Fn)
 Compute the set of registers that need to be preserved and forwarded to any musttail calls. More...
 
template<class T >
void AnalyzeArgumentsSecondPass (const SmallVectorImpl< T > &Args, CCAssignFn Fn)
 The function runs an additional analysis pass over function arguments. More...
 

Static Public Member Functions

static bool resultsCompatible (CallingConv::ID CalleeCC, CallingConv::ID CallerCC, MachineFunction &MF, LLVMContext &C, const SmallVectorImpl< ISD::InputArg > &Ins, CCAssignFn CalleeFn, CCAssignFn CallerFn)
 Returns true if the results of the two calling conventions are compatible. More...
 

Detailed Description

CCState - This class holds information needed while lowering arguments and return values.

It captures which registers are already assigned and which stack slots are used. It provides accessors to allocate these values.

Definition at line 190 of file CallingConvLower.h.

Constructor & Destructor Documentation

◆ CCState()

CCState::CCState ( CallingConv::ID  CC,
bool  isVarArg,
MachineFunction MF,
SmallVectorImpl< CCValAssign > &  locs,
LLVMContext C 
)

Member Function Documentation

◆ addInRegsParamInfo()

void llvm::CCState::addInRegsParamInfo ( unsigned  RegBegin,
unsigned  RegEnd 
)
inline

◆ addLoc()

void llvm::CCState::addLoc ( const CCValAssign V)
inline

◆ AllocateReg() [1/4]

unsigned llvm::CCState::AllocateReg ( unsigned  Reg)
inline

◆ AllocateReg() [2/4]

unsigned llvm::CCState::AllocateReg ( unsigned  Reg,
unsigned  ShadowReg 
)
inline

Version of AllocateReg with extra register to be shadowed.

Definition at line 359 of file CallingConvLower.h.

◆ AllocateReg() [3/4]

unsigned llvm::CCState::AllocateReg ( ArrayRef< MCPhysReg Regs)
inline

AllocateReg - Attempt to allocate one of the specified registers.

If none are available, return zero. Otherwise, return the first one available, marking it and any aliases as allocated.

Definition at line 369 of file CallingConvLower.h.

References llvm::ArrayRef< T >::size().

◆ AllocateReg() [4/4]

unsigned llvm::CCState::AllocateReg ( ArrayRef< MCPhysReg Regs,
const MCPhysReg ShadowRegs 
)
inline

Version of AllocateReg with list of registers to be shadowed.

Definition at line 410 of file CallingConvLower.h.

References llvm::ArrayRef< T >::size().

◆ AllocateRegBlock()

unsigned llvm::CCState::AllocateRegBlock ( ArrayRef< MCPhysReg Regs,
unsigned  RegsRequired 
)
inline

AllocateRegBlock - Attempt to allocate a block of RegsRequired consecutive registers.

If this is not possible, return zero. Otherwise, return the first register of the block that were allocated, marking the entire block as allocated.

Definition at line 383 of file CallingConvLower.h.

References llvm::ArrayRef< T >::size().

Referenced by llvm::CC_ARM_AAPCS_Custom_Aggregate().

◆ AllocateStack() [1/3]

unsigned llvm::CCState::AllocateStack ( unsigned  Size,
unsigned  Align 
)
inline

◆ AllocateStack() [2/3]

unsigned llvm::CCState::AllocateStack ( unsigned  Size,
unsigned  Align,
unsigned  ShadowReg 
)
inline

Version of AllocateStack with extra register to be shadowed.

Definition at line 440 of file CallingConvLower.h.

◆ AllocateStack() [3/3]

unsigned llvm::CCState::AllocateStack ( unsigned  Size,
unsigned  Align,
ArrayRef< MCPhysReg ShadowRegs 
)
inline

Version of AllocateStack with list of extra registers to be shadowed.

Note that, unlike AllocateReg, this shadows ALL of the shadow registers.

Definition at line 447 of file CallingConvLower.h.

References llvm::MinAlign(), and llvm::ArrayRef< T >::size().

◆ AnalyzeArguments() [1/2]

void llvm::CCState::AnalyzeArguments ( const SmallVectorImpl< ISD::InputArg > &  Ins,
CCAssignFn  Fn 
)
inline

The function will invoke AnalyzeFormalArguments.

Definition at line 293 of file CallingConvLower.h.

◆ AnalyzeArguments() [2/2]

void llvm::CCState::AnalyzeArguments ( const SmallVectorImpl< ISD::OutputArg > &  Outs,
CCAssignFn  Fn 
)
inline

The function will invoke AnalyzeCallOperands.

Definition at line 321 of file CallingConvLower.h.

◆ AnalyzeArgumentsSecondPass()

template<class T >
void llvm::CCState::AnalyzeArgumentsSecondPass ( const SmallVectorImpl< T > &  Args,
CCAssignFn  Fn 
)
inline

The function runs an additional analysis pass over function arguments.

It will mark each argument with the attribute flag SecArgPass. After running, it will sort the locs list.

Creates similar argument list to Args in which each argument is marked using SecArgPass flag.

Definition at line 536 of file CallingConvLower.h.

References AnalyzeArguments(), Arg, B, llvm::SmallVectorTemplateCommon< T >::begin(), E, llvm::SmallVectorTemplateCommon< T >::end(), llvm::CCValAssign::getValNo(), llvm::SmallVectorTemplateBase< T, isPodLike< T >::value >::push_back(), llvm::SmallVectorTemplateCommon< T >::size(), and std::swap().

◆ AnalyzeCallOperands() [1/2]

void CCState::AnalyzeCallOperands ( const SmallVectorImpl< ISD::OutputArg > &  Outs,
CCAssignFn  Fn 
)

◆ AnalyzeCallOperands() [2/2]

void CCState::AnalyzeCallOperands ( SmallVectorImpl< MVT > &  ArgVTs,
SmallVectorImpl< ISD::ArgFlagsTy > &  Flags,
CCAssignFn  Fn 
)

AnalyzeCallOperands - Same as above except it takes vectors of types and argument flags.

Same as above except it takes vectors of types and argument flags.

Definition at line 155 of file CallingConvLower.cpp.

References llvm::dbgs(), llvm::CCValAssign::Full, llvm::EVT::getEVTString(), llvm_unreachable, and llvm::SmallVectorTemplateCommon< T >::size().

◆ AnalyzeCallResult() [1/2]

void CCState::AnalyzeCallResult ( const SmallVectorImpl< ISD::InputArg > &  Ins,
CCAssignFn  Fn 
)

◆ AnalyzeCallResult() [2/2]

void CCState::AnalyzeCallResult ( MVT  VT,
CCAssignFn  Fn 
)

AnalyzeCallResult - Same as above except it's specialized for calls which produce a single value.

Same as above except it's specialized for calls that produce a single value.

Definition at line 190 of file CallingConvLower.cpp.

References llvm::dbgs(), llvm::CCValAssign::Full, llvm::EVT::getEVTString(), and llvm_unreachable.

◆ AnalyzeFormalArguments()

void CCState::AnalyzeFormalArguments ( const SmallVectorImpl< ISD::InputArg > &  Ins,
CCAssignFn  Fn 
)

◆ analyzeMustTailForwardedRegisters()

void CCState::analyzeMustTailForwardedRegisters ( SmallVectorImpl< ForwardedRegister > &  Forwards,
ArrayRef< MVT RegParmTypes,
CCAssignFn  Fn 
)

◆ AnalyzeReturn()

void CCState::AnalyzeReturn ( const SmallVectorImpl< ISD::OutputArg > &  Outs,
CCAssignFn  Fn 
)

◆ CheckReturn()

bool CCState::CheckReturn ( const SmallVectorImpl< ISD::OutputArg > &  Outs,
CCAssignFn  Fn 
)

CheckReturn - Analyze the return values of a function, returning true if the return can be performed without sret-demotion, and false otherwise.

Analyze the return values of a function, returning true if the return can be performed without sret-demotion and false otherwise.

Definition at line 106 of file CallingConvLower.cpp.

References llvm::CCValAssign::Full, and llvm::SmallVectorTemplateCommon< T >::size().

Referenced by llvm::analyzeArguments(), AnalyzeReturnValues(), llvm::HexagonTargetLowering::CanLowerReturn(), llvm::SITargetLowering::CanLowerReturn(), llvm::SystemZTargetLowering::CanLowerReturn(), llvm::MipsCCState::CheckReturn(), llvm::X86TargetLowering::isNoopAddrSpaceCast(), lowerCallResult(), LowerCallResult(), MatchingStackOffset(), mayTailCallThisCC(), and PrepareCall().

◆ clearByValRegsInfo()

void llvm::CCState::clearByValRegsInfo ( )
inline

Definition at line 496 of file CallingConvLower.h.

References llvm::SmallVectorImpl< T >::clear().

Referenced by CCState().

◆ ensureMaxAlignment()

void llvm::CCState::ensureMaxAlignment ( unsigned  Align)
inline

◆ getAlignedCallFrameSize()

unsigned llvm::CCState::getAlignedCallFrameSize ( ) const
inline

getAlignedCallFrameSize - Return the size of the call frame needed to be able to store all arguments and such that the alignment requirement of each of the arguments is satisfied.

Definition at line 277 of file CallingConvLower.h.

References llvm::alignTo().

◆ getCallingConv()

CallingConv::ID llvm::CCState::getCallingConv ( ) const
inline

◆ getContext()

LLVMContext& llvm::CCState::getContext ( ) const
inline

◆ getFirstUnallocated()

unsigned llvm::CCState::getFirstUnallocated ( ArrayRef< MCPhysReg Regs) const
inline

◆ getInRegsParamInfo()

void llvm::CCState::getInRegsParamInfo ( unsigned  InRegsParamRecordIndex,
unsigned BeginReg,
unsigned EndReg 
) const
inline

◆ getInRegsParamsCount()

unsigned llvm::CCState::getInRegsParamsCount ( ) const
inline

◆ getInRegsParamsProcessed()

unsigned llvm::CCState::getInRegsParamsProcessed ( ) const
inline

Definition at line 466 of file CallingConvLower.h.

Referenced by llvm::MipsTargetLowering::getOpndList(), and LowerVASTART().

◆ getMachineFunction()

MachineFunction& llvm::CCState::getMachineFunction ( ) const
inline

◆ getNextStackOffset()

unsigned llvm::CCState::getNextStackOffset ( ) const
inline

◆ getPendingLocs()

SmallVectorImpl<CCValAssign>& llvm::CCState::getPendingLocs ( )
inline

◆ getRemainingRegParmsForType()

void CCState::getRemainingRegParmsForType ( SmallVectorImpl< MCPhysReg > &  Regs,
MVT  VT,
CCAssignFn  Fn 
)

Compute the remaining unused register parameters that would be used for the given value type.

This is useful when varargs are passed in the registers that normal prototyped parameters would be passed in, or for implementing perfect forwarding.

Definition at line 210 of file CallingConvLower.cpp.

References assert(), llvm::dbgs(), E, llvm::CCValAssign::Full, llvm::EVT::getEVTString(), I, isValueTypeInRegForCC(), llvm_unreachable, llvm::SmallVectorTemplateBase< T, isPodLike >::push_back(), and llvm::ISD::ArgFlagsTy::setInReg().

Referenced by analyzeMustTailForwardedRegisters().

◆ HandleByVal()

void CCState::HandleByVal ( unsigned  ValNo,
MVT  ValVT,
MVT  LocVT,
CCValAssign::LocInfo  LocInfo,
int  MinSize,
int  MinAlign,
ISD::ArgFlagsTy  ArgFlags 
)

◆ isAllocated()

bool llvm::CCState::isAllocated ( unsigned  Reg) const
inline

isAllocated - Return true if the specified register (or an alias) is allocated.

Definition at line 283 of file CallingConvLower.h.

References llvm::MipsISD::Ins.

Referenced by llvm::CC_X86_32_RegCall_Assign2Regs(), llvm::CC_X86_64_VectorCall(), llvm::CC_X86_VectorCallAssignRegister(), findFirstFreeSGPR(), and IsShadowAllocatedReg().

◆ IsShadowAllocatedReg()

bool CCState::IsShadowAllocatedReg ( unsigned  Reg) const

A shadow allocated register is a register that was allocated but wasn't added to the location list (Locs).

Returns
true if the register was allocated as shadow or false otherwise.

Definition at line 68 of file CallingConvLower.cpp.

References isAllocated(), and llvm::MCRegAliasIterator::isValid().

Referenced by llvm::CC_X86_VectorCallAssignRegister().

◆ isVarArg()

bool llvm::CCState::isVarArg ( ) const
inline

Definition at line 266 of file CallingConvLower.h.

Referenced by AnalyzeArguments(), and CC_MipsO32().

◆ nextInRegsParam()

bool llvm::CCState::nextInRegsParam ( )
inline

◆ resultsCompatible()

bool CCState::resultsCompatible ( CallingConv::ID  CalleeCC,
CallingConv::ID  CallerCC,
MachineFunction MF,
LLVMContext C,
const SmallVectorImpl< ISD::InputArg > &  Ins,
CCAssignFn  CalleeFn,
CCAssignFn  CallerFn 
)
static

Returns true if the results of the two calling conventions are compatible.

This is usually part of the check for tailcall eligibility.

Definition at line 270 of file CallingConvLower.cpp.

References AnalyzeCallResult(), E, llvm::CCValAssign::getLocInfo(), llvm::CCValAssign::getLocMemOffset(), llvm::CCValAssign::getLocReg(), I, llvm::CCValAssign::isRegLoc(), and llvm::SmallVectorTemplateCommon< T >::size().

Referenced by llvm::SITargetLowering::isEligibleForTailCallOptimization(), MatchingStackOffset(), and mayTailCallThisCC().

◆ rewindByValRegsInfo()

void llvm::CCState::rewindByValRegsInfo ( )
inline

Definition at line 502 of file CallingConvLower.h.

Referenced by llvm::MipsTargetLowering::getOpndList(), and LowerVASTART().


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