LLVM  4.0.0
CallingConvLower.h
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1 //===-- llvm/CallingConvLower.h - Calling Conventions -----------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file declares the CCState and CCValAssign classes, used for lowering
11 // and implementing calling conventions.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #ifndef LLVM_CODEGEN_CALLINGCONVLOWER_H
16 #define LLVM_CODEGEN_CALLINGCONVLOWER_H
17 
18 #include "llvm/ADT/SmallVector.h"
21 #include "llvm/IR/CallingConv.h"
22 #include "llvm/MC/MCRegisterInfo.h"
24 
25 namespace llvm {
26 class CCState;
27 class MVT;
28 class TargetMachine;
29 class TargetRegisterInfo;
30 
31 /// CCValAssign - Represent assignment of one arg/retval to a location.
32 class CCValAssign {
33 public:
34  enum LocInfo {
35  Full, // The value fills the full location.
36  SExt, // The value is sign extended in the location.
37  ZExt, // The value is zero extended in the location.
38  AExt, // The value is extended with undefined upper bits.
39  SExtUpper, // The value is in the upper bits of the location and should be
40  // sign extended when retrieved.
41  ZExtUpper, // The value is in the upper bits of the location and should be
42  // zero extended when retrieved.
43  AExtUpper, // The value is in the upper bits of the location and should be
44  // extended with undefined upper bits when retrieved.
45  BCvt, // The value is bit-converted in the location.
46  VExt, // The value is vector-widened in the location.
47  // FIXME: Not implemented yet. Code that uses AExt to mean
48  // vector-widen should be fixed to use VExt instead.
49  FPExt, // The floating-point value is fp-extended in the location.
50  Indirect // The location contains pointer to the value.
51  // TODO: a subset of the value is in the location.
52  };
53 
54 private:
55  /// ValNo - This is the value number begin assigned (e.g. an argument number).
56  unsigned ValNo;
57 
58  /// Loc is either a stack offset or a register number.
59  unsigned Loc;
60 
61  /// isMem - True if this is a memory loc, false if it is a register loc.
62  unsigned isMem : 1;
63 
64  /// isCustom - True if this arg/retval requires special handling.
65  unsigned isCustom : 1;
66 
67  /// Information about how the value is assigned.
68  LocInfo HTP : 6;
69 
70  /// ValVT - The type of the value being assigned.
71  MVT ValVT;
72 
73  /// LocVT - The type of the location being assigned to.
74  MVT LocVT;
75 public:
76 
77  static CCValAssign getReg(unsigned ValNo, MVT ValVT,
78  unsigned RegNo, MVT LocVT,
79  LocInfo HTP) {
81  Ret.ValNo = ValNo;
82  Ret.Loc = RegNo;
83  Ret.isMem = false;
84  Ret.isCustom = false;
85  Ret.HTP = HTP;
86  Ret.ValVT = ValVT;
87  Ret.LocVT = LocVT;
88  return Ret;
89  }
90 
91  static CCValAssign getCustomReg(unsigned ValNo, MVT ValVT,
92  unsigned RegNo, MVT LocVT,
93  LocInfo HTP) {
95  Ret = getReg(ValNo, ValVT, RegNo, LocVT, HTP);
96  Ret.isCustom = true;
97  return Ret;
98  }
99 
100  static CCValAssign getMem(unsigned ValNo, MVT ValVT,
101  unsigned Offset, MVT LocVT,
102  LocInfo HTP) {
104  Ret.ValNo = ValNo;
105  Ret.Loc = Offset;
106  Ret.isMem = true;
107  Ret.isCustom = false;
108  Ret.HTP = HTP;
109  Ret.ValVT = ValVT;
110  Ret.LocVT = LocVT;
111  return Ret;
112  }
113 
114  static CCValAssign getCustomMem(unsigned ValNo, MVT ValVT,
115  unsigned Offset, MVT LocVT,
116  LocInfo HTP) {
118  Ret = getMem(ValNo, ValVT, Offset, LocVT, HTP);
119  Ret.isCustom = true;
120  return Ret;
121  }
122 
123  // There is no need to differentiate between a pending CCValAssign and other
124  // kinds, as they are stored in a different list.
125  static CCValAssign getPending(unsigned ValNo, MVT ValVT, MVT LocVT,
126  LocInfo HTP, unsigned ExtraInfo = 0) {
127  return getReg(ValNo, ValVT, ExtraInfo, LocVT, HTP);
128  }
129 
130  void convertToReg(unsigned RegNo) {
131  Loc = RegNo;
132  isMem = false;
133  }
134 
135  void convertToMem(unsigned Offset) {
136  Loc = Offset;
137  isMem = true;
138  }
139 
140  unsigned getValNo() const { return ValNo; }
141  MVT getValVT() const { return ValVT; }
142 
143  bool isRegLoc() const { return !isMem; }
144  bool isMemLoc() const { return isMem; }
145 
146  bool needsCustom() const { return isCustom; }
147 
148  unsigned getLocReg() const { assert(isRegLoc()); return Loc; }
149  unsigned getLocMemOffset() const { assert(isMemLoc()); return Loc; }
150  unsigned getExtraInfo() const { return Loc; }
151  MVT getLocVT() const { return LocVT; }
152 
153  LocInfo getLocInfo() const { return HTP; }
154  bool isExtInLoc() const {
155  return (HTP == AExt || HTP == SExt || HTP == ZExt);
156  }
157 
158  bool isUpperBitsInLoc() const {
159  return HTP == AExtUpper || HTP == SExtUpper || HTP == ZExtUpper;
160  }
161 };
162 
163 /// Describes a register that needs to be forwarded from the prologue to a
164 /// musttail call.
167  : VReg(VReg), PReg(PReg), VT(VT) {}
168  unsigned VReg;
171 };
172 
173 /// CCAssignFn - This function assigns a location for Val, updating State to
174 /// reflect the change. It returns 'true' if it failed to handle Val.
175 typedef bool CCAssignFn(unsigned ValNo, MVT ValVT,
176  MVT LocVT, CCValAssign::LocInfo LocInfo,
177  ISD::ArgFlagsTy ArgFlags, CCState &State);
178 
179 /// CCCustomFn - This function assigns a location for Val, possibly updating
180 /// all args to reflect changes and indicates if it handled it. It must set
181 /// isCustom if it handles the arg and returns true.
182 typedef bool CCCustomFn(unsigned &ValNo, MVT &ValVT,
183  MVT &LocVT, CCValAssign::LocInfo &LocInfo,
184  ISD::ArgFlagsTy &ArgFlags, CCState &State);
185 
186 /// ParmContext - This enum tracks whether calling convention lowering is in
187 /// the context of prologue or call generation. Not all backends make use of
188 /// this information.
189 typedef enum { Unknown, Prologue, Call } ParmContext;
190 
191 /// CCState - This class holds information needed while lowering arguments and
192 /// return values. It captures which registers are already assigned and which
193 /// stack slots are used. It provides accessors to allocate these values.
194 class CCState {
195 private:
196  CallingConv::ID CallingConv;
197  bool IsVarArg;
198  bool AnalyzingMustTailForwardedRegs = false;
199  MachineFunction &MF;
200  const TargetRegisterInfo &TRI;
202  LLVMContext &Context;
203 
204  unsigned StackOffset;
205  unsigned MaxStackArgAlign;
206  SmallVector<uint32_t, 16> UsedRegs;
207  SmallVector<CCValAssign, 4> PendingLocs;
208 
209  // ByValInfo and SmallVector<ByValInfo, 4> ByValRegs:
210  //
211  // Vector of ByValInfo instances (ByValRegs) is introduced for byval registers
212  // tracking.
213  // Or, in another words it tracks byval parameters that are stored in
214  // general purpose registers.
215  //
216  // For 4 byte stack alignment,
217  // instance index means byval parameter number in formal
218  // arguments set. Assume, we have some "struct_type" with size = 4 bytes,
219  // then, for function "foo":
220  //
221  // i32 foo(i32 %p, %struct_type* %r, i32 %s, %struct_type* %t)
222  //
223  // ByValRegs[0] describes how "%r" is stored (Begin == r1, End == r2)
224  // ByValRegs[1] describes how "%t" is stored (Begin == r3, End == r4).
225  //
226  // In case of 8 bytes stack alignment,
227  // ByValRegs may also contain information about wasted registers.
228  // In function shown above, r3 would be wasted according to AAPCS rules.
229  // And in that case ByValRegs[1].Waste would be "true".
230  // ByValRegs vector size still would be 2,
231  // while "%t" goes to the stack: it wouldn't be described in ByValRegs.
232  //
233  // Supposed use-case for this collection:
234  // 1. Initially ByValRegs is empty, InRegsParamsProcessed is 0.
235  // 2. HandleByVal fillups ByValRegs.
236  // 3. Argument analysis (LowerFormatArguments, for example). After
237  // some byval argument was analyzed, InRegsParamsProcessed is increased.
238  struct ByValInfo {
239  ByValInfo(unsigned B, unsigned E, bool IsWaste = false) :
240  Begin(B), End(E), Waste(IsWaste) {}
241  // First register allocated for current parameter.
242  unsigned Begin;
243 
244  // First after last register allocated for current parameter.
245  unsigned End;
246 
247  // Means that current range of registers doesn't belong to any
248  // parameters. It was wasted due to stack alignment rules.
249  // For more information see:
250  // AAPCS, 5.5 Parameter Passing, Stage C, C.3.
251  bool Waste;
252  };
253  SmallVector<ByValInfo, 4 > ByValRegs;
254 
255  // InRegsParamsProcessed - shows how many instances of ByValRegs was proceed
256  // during argument analysis.
257  unsigned InRegsParamsProcessed;
258 
259 protected:
261 
262 public:
265 
266  void addLoc(const CCValAssign &V) {
267  Locs.push_back(V);
268  }
269 
270  LLVMContext &getContext() const { return Context; }
271  MachineFunction &getMachineFunction() const { return MF; }
272  CallingConv::ID getCallingConv() const { return CallingConv; }
273  bool isVarArg() const { return IsVarArg; }
274 
275  /// getNextStackOffset - Return the next stack offset such that all stack
276  /// slots satisfy their alignment requirements.
277  unsigned getNextStackOffset() const {
278  return StackOffset;
279  }
280 
281  /// getAlignedCallFrameSize - Return the size of the call frame needed to
282  /// be able to store all arguments and such that the alignment requirement
283  /// of each of the arguments is satisfied.
284  unsigned getAlignedCallFrameSize() const {
285  return alignTo(StackOffset, MaxStackArgAlign);
286  }
287 
288  /// isAllocated - Return true if the specified register (or an alias) is
289  /// allocated.
290  bool isAllocated(unsigned Reg) const {
291  return UsedRegs[Reg/32] & (1 << (Reg&31));
292  }
293 
294  /// AnalyzeFormalArguments - Analyze an array of argument values,
295  /// incorporating info about the formals into this state.
297  CCAssignFn Fn);
298 
299  /// The function will invoke AnalyzeFormalArguments.
301  CCAssignFn Fn) {
302  AnalyzeFormalArguments(Ins, Fn);
303  }
304 
305  /// AnalyzeReturn - Analyze the returned values of a return,
306  /// incorporating info about the result values into this state.
308  CCAssignFn Fn);
309 
310  /// CheckReturn - Analyze the return values of a function, returning
311  /// true if the return can be performed without sret-demotion, and
312  /// false otherwise.
313  bool CheckReturn(const SmallVectorImpl<ISD::OutputArg> &ArgsFlags,
314  CCAssignFn Fn);
315 
316  /// AnalyzeCallOperands - Analyze the outgoing arguments to a call,
317  /// incorporating info about the passed values into this state.
319  CCAssignFn Fn);
320 
321  /// AnalyzeCallOperands - Same as above except it takes vectors of types
322  /// and argument flags.
325  CCAssignFn Fn);
326 
327  /// The function will invoke AnalyzeCallOperands.
329  CCAssignFn Fn) {
330  AnalyzeCallOperands(Outs, Fn);
331  }
332 
333  /// AnalyzeCallResult - Analyze the return values of a call,
334  /// incorporating info about the passed values into this state.
336  CCAssignFn Fn);
337 
338  /// A shadow allocated register is a register that was allocated
339  /// but wasn't added to the location list (Locs).
340  /// \returns true if the register was allocated as shadow or false otherwise.
341  bool IsShadowAllocatedReg(unsigned Reg) const;
342 
343  /// AnalyzeCallResult - Same as above except it's specialized for calls which
344  /// produce a single value.
345  void AnalyzeCallResult(MVT VT, CCAssignFn Fn);
346 
347  /// getFirstUnallocated - Return the index of the first unallocated register
348  /// in the set, or Regs.size() if they are all allocated.
350  for (unsigned i = 0; i < Regs.size(); ++i)
351  if (!isAllocated(Regs[i]))
352  return i;
353  return Regs.size();
354  }
355 
356  /// AllocateReg - Attempt to allocate one register. If it is not available,
357  /// return zero. Otherwise, return the register, marking it and any aliases
358  /// as allocated.
359  unsigned AllocateReg(unsigned Reg) {
360  if (isAllocated(Reg)) return 0;
361  MarkAllocated(Reg);
362  return Reg;
363  }
364 
365  /// Version of AllocateReg with extra register to be shadowed.
366  unsigned AllocateReg(unsigned Reg, unsigned ShadowReg) {
367  if (isAllocated(Reg)) return 0;
368  MarkAllocated(Reg);
369  MarkAllocated(ShadowReg);
370  return Reg;
371  }
372 
373  /// AllocateReg - Attempt to allocate one of the specified registers. If none
374  /// are available, return zero. Otherwise, return the first one available,
375  /// marking it and any aliases as allocated.
377  unsigned FirstUnalloc = getFirstUnallocated(Regs);
378  if (FirstUnalloc == Regs.size())
379  return 0; // Didn't find the reg.
380 
381  // Mark the register and any aliases as allocated.
382  unsigned Reg = Regs[FirstUnalloc];
383  MarkAllocated(Reg);
384  return Reg;
385  }
386 
387  /// AllocateRegBlock - Attempt to allocate a block of RegsRequired consecutive
388  /// registers. If this is not possible, return zero. Otherwise, return the first
389  /// register of the block that were allocated, marking the entire block as allocated.
390  unsigned AllocateRegBlock(ArrayRef<MCPhysReg> Regs, unsigned RegsRequired) {
391  if (RegsRequired > Regs.size())
392  return 0;
393 
394  for (unsigned StartIdx = 0; StartIdx <= Regs.size() - RegsRequired;
395  ++StartIdx) {
396  bool BlockAvailable = true;
397  // Check for already-allocated regs in this block
398  for (unsigned BlockIdx = 0; BlockIdx < RegsRequired; ++BlockIdx) {
399  if (isAllocated(Regs[StartIdx + BlockIdx])) {
400  BlockAvailable = false;
401  break;
402  }
403  }
404  if (BlockAvailable) {
405  // Mark the entire block as allocated
406  for (unsigned BlockIdx = 0; BlockIdx < RegsRequired; ++BlockIdx) {
407  MarkAllocated(Regs[StartIdx + BlockIdx]);
408  }
409  return Regs[StartIdx];
410  }
411  }
412  // No block was available
413  return 0;
414  }
415 
416  /// Version of AllocateReg with list of registers to be shadowed.
417  unsigned AllocateReg(ArrayRef<MCPhysReg> Regs, const MCPhysReg *ShadowRegs) {
418  unsigned FirstUnalloc = getFirstUnallocated(Regs);
419  if (FirstUnalloc == Regs.size())
420  return 0; // Didn't find the reg.
421 
422  // Mark the register and any aliases as allocated.
423  unsigned Reg = Regs[FirstUnalloc], ShadowReg = ShadowRegs[FirstUnalloc];
424  MarkAllocated(Reg);
425  MarkAllocated(ShadowReg);
426  return Reg;
427  }
428 
429  /// AllocateStack - Allocate a chunk of stack space with the specified size
430  /// and alignment.
431  unsigned AllocateStack(unsigned Size, unsigned Align) {
432  assert(Align && ((Align - 1) & Align) == 0); // Align is power of 2.
433  StackOffset = alignTo(StackOffset, Align);
434  unsigned Result = StackOffset;
435  StackOffset += Size;
436  MaxStackArgAlign = std::max(Align, MaxStackArgAlign);
437  ensureMaxAlignment(Align);
438  return Result;
439  }
440 
441  void ensureMaxAlignment(unsigned Align) {
442  if (!AnalyzingMustTailForwardedRegs)
443  MF.getFrameInfo().ensureMaxAlignment(Align);
444  }
445 
446  /// Version of AllocateStack with extra register to be shadowed.
447  unsigned AllocateStack(unsigned Size, unsigned Align, unsigned ShadowReg) {
448  MarkAllocated(ShadowReg);
449  return AllocateStack(Size, Align);
450  }
451 
452  /// Version of AllocateStack with list of extra registers to be shadowed.
453  /// Note that, unlike AllocateReg, this shadows ALL of the shadow registers.
454  unsigned AllocateStack(unsigned Size, unsigned Align,
455  ArrayRef<MCPhysReg> ShadowRegs) {
456  for (unsigned i = 0; i < ShadowRegs.size(); ++i)
457  MarkAllocated(ShadowRegs[i]);
458  return AllocateStack(Size, Align);
459  }
460 
461  // HandleByVal - Allocate a stack slot large enough to pass an argument by
462  // value. The size and alignment information of the argument is encoded in its
463  // parameter attribute.
464  void HandleByVal(unsigned ValNo, MVT ValVT,
465  MVT LocVT, CCValAssign::LocInfo LocInfo,
466  int MinSize, int MinAlign, ISD::ArgFlagsTy ArgFlags);
467 
468  // Returns count of byval arguments that are to be stored (even partly)
469  // in registers.
470  unsigned getInRegsParamsCount() const { return ByValRegs.size(); }
471 
472  // Returns count of byval in-regs arguments proceed.
473  unsigned getInRegsParamsProcessed() const { return InRegsParamsProcessed; }
474 
475  // Get information about N-th byval parameter that is stored in registers.
476  // Here "ByValParamIndex" is N.
477  void getInRegsParamInfo(unsigned InRegsParamRecordIndex,
478  unsigned& BeginReg, unsigned& EndReg) const {
479  assert(InRegsParamRecordIndex < ByValRegs.size() &&
480  "Wrong ByVal parameter index");
481 
482  const ByValInfo& info = ByValRegs[InRegsParamRecordIndex];
483  BeginReg = info.Begin;
484  EndReg = info.End;
485  }
486 
487  // Add information about parameter that is kept in registers.
488  void addInRegsParamInfo(unsigned RegBegin, unsigned RegEnd) {
489  ByValRegs.push_back(ByValInfo(RegBegin, RegEnd));
490  }
491 
492  // Goes either to next byval parameter (excluding "waste" record), or
493  // to the end of collection.
494  // Returns false, if end is reached.
496  unsigned e = ByValRegs.size();
497  if (InRegsParamsProcessed < e)
498  ++InRegsParamsProcessed;
499  return InRegsParamsProcessed < e;
500  }
501 
502  // Clear byval registers tracking info.
504  InRegsParamsProcessed = 0;
505  ByValRegs.clear();
506  }
507 
508  // Rewind byval registers tracking info.
510  InRegsParamsProcessed = 0;
511  }
512 
514 
515  // Get list of pending assignments
517  return PendingLocs;
518  }
519 
520  /// Compute the remaining unused register parameters that would be used for
521  /// the given value type. This is useful when varargs are passed in the
522  /// registers that normal prototyped parameters would be passed in, or for
523  /// implementing perfect forwarding.
525  CCAssignFn Fn);
526 
527  /// Compute the set of registers that need to be preserved and forwarded to
528  /// any musttail calls.
530  SmallVectorImpl<ForwardedRegister> &Forwards, ArrayRef<MVT> RegParmTypes,
531  CCAssignFn Fn);
532 
533  /// Returns true if the results of the two calling conventions are compatible.
534  /// This is usually part of the check for tailcall eligibility.
535  static bool resultsCompatible(CallingConv::ID CalleeCC,
536  CallingConv::ID CallerCC, MachineFunction &MF,
537  LLVMContext &C,
539  CCAssignFn CalleeFn, CCAssignFn CallerFn);
540 
541  /// The function runs an additional analysis pass over function arguments.
542  /// It will mark each argument with the attribute flag SecArgPass.
543  /// After running, it will sort the locs list.
544  template <class T>
546  CCAssignFn Fn) {
547  unsigned NumFirstPassLocs = Locs.size();
548 
549  /// Creates similar argument list to \p Args in which each argument is
550  /// marked using SecArgPass flag.
551  SmallVector<T, 16> SecPassArg;
552  // SmallVector<ISD::InputArg, 16> SecPassArg;
553  for (auto Arg : Args) {
554  Arg.Flags.setSecArgPass();
555  SecPassArg.push_back(Arg);
556  }
557 
558  // Run the second argument pass
559  AnalyzeArguments(SecPassArg, Fn);
560 
561  // Sort the locations of the arguments according to their original position.
562  SmallVector<CCValAssign, 16> TmpArgLocs;
563  std::swap(TmpArgLocs, Locs);
564  auto B = TmpArgLocs.begin(), E = TmpArgLocs.end();
565  std::merge(B, B + NumFirstPassLocs, B + NumFirstPassLocs, E,
566  std::back_inserter(Locs),
567  [](const CCValAssign &A, const CCValAssign &B) -> bool {
568  return A.getValNo() < B.getValNo();
569  });
570  }
571 
572 private:
573  /// MarkAllocated - Mark a register and all of its aliases as allocated.
574  void MarkAllocated(unsigned Reg);
575 };
576 
577 
578 
579 } // end namespace llvm
580 
581 #endif
void AnalyzeCallResult(const SmallVectorImpl< ISD::InputArg > &Ins, CCAssignFn Fn)
AnalyzeCallResult - Analyze the return values of a call, incorporating info about the passed values i...
void push_back(const T &Elt)
Definition: SmallVector.h:211
static CCValAssign getPending(unsigned ValNo, MVT ValVT, MVT LocVT, LocInfo HTP, unsigned ExtraInfo=0)
MVT getValVT() const
static CCValAssign getCustomReg(unsigned ValNo, MVT ValVT, unsigned RegNo, MVT LocVT, LocInfo HTP)
size_t i
LocInfo getLocInfo() const
Describes a register that needs to be forwarded from the prologue to a musttail call.
void getInRegsParamInfo(unsigned InRegsParamRecordIndex, unsigned &BeginReg, unsigned &EndReg) const
void AnalyzeFormalArguments(const SmallVectorImpl< ISD::InputArg > &Ins, CCAssignFn Fn)
AnalyzeFormalArguments - Analyze an array of argument values, incorporating info about the formals in...
void AnalyzeArgumentsSecondPass(const SmallVectorImpl< T > &Args, CCAssignFn Fn)
The function runs an additional analysis pass over function arguments.
CallingConv::ID getCallingConv() const
bool CCAssignFn(unsigned ValNo, MVT ValVT, MVT LocVT, CCValAssign::LocInfo LocInfo, ISD::ArgFlagsTy ArgFlags, CCState &State)
CCAssignFn - This function assigns a location for Val, updating State to reflect the change...
uint16_t MCPhysReg
An unsigned integer type large enough to represent all physical registers, but not necessarily virtua...
unsigned getInRegsParamsCount() const
uint64_t alignTo(uint64_t Value, uint64_t Align, uint64_t Skew=0)
Returns the next integer (mod 2**64) that is greater than or equal to Value and is a multiple of Alig...
Definition: MathExtras.h:664
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 ...
unsigned getValNo() const
LLVMContext & getContext() const
bool isRegLoc() const
lazy value info
void convertToMem(unsigned Offset)
unsigned AllocateReg(unsigned Reg, unsigned ShadowReg)
Version of AllocateReg with extra register to be shadowed.
bool CCCustomFn(unsigned &ValNo, MVT &ValVT, MVT &LocVT, CCValAssign::LocInfo &LocInfo, ISD::ArgFlagsTy &ArgFlags, CCState &State)
CCCustomFn - This function assigns a location for Val, possibly updating all args to reflect changes ...
global merge
struct fuzzer::@269 Flags
ParmContext getCallOrPrologue() const
unsigned AllocateReg(ArrayRef< MCPhysReg > Regs)
AllocateReg - Attempt to allocate one of the specified registers.
This class consists of common code factored out of the SmallVector class to reduce code duplication b...
Definition: APFloat.h:32
void addLoc(const CCValAssign &V)
Reg
All possible values of the reg field in the ModR/M byte.
bool isUpperBitsInLoc() const
SmallVectorImpl< llvm::CCValAssign > & getPendingLocs()
MachineFunction & getMachineFunction() const
unsigned getLocReg() const
const RegList & Regs
void addInRegsParamInfo(unsigned RegBegin, unsigned RegEnd)
static GCRegistry::Add< OcamlGC > B("ocaml","ocaml 3.10-compatible GC")
size_t size() const
size - Get the array size.
Definition: ArrayRef.h:141
static GCRegistry::Add< CoreCLRGC > E("coreclr","CoreCLR-compatible GC")
static CCValAssign getReg(unsigned ValNo, MVT ValVT, unsigned RegNo, MVT LocVT, LocInfo HTP)
constexpr uint64_t MinAlign(uint64_t A, uint64_t B)
MinAlign - A and B are either alignments or offsets.
Definition: MathExtras.h:589
unsigned AllocateReg(ArrayRef< MCPhysReg > Regs, const MCPhysReg *ShadowRegs)
Version of AllocateReg with list of registers to be shadowed.
bool IsShadowAllocatedReg(unsigned Reg) const
A shadow allocated register is a register that was allocated but wasn't added to the location list (L...
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.
ForwardedRegister(unsigned VReg, MCPhysReg PReg, MVT VT)
unsigned getAlignedCallFrameSize() const
getAlignedCallFrameSize - Return the size of the call frame needed to be able to store all arguments ...
MVT - Machine Value Type.
ParmContext
ParmContext - This enum tracks whether calling convention lowering is in the context of prologue or c...
This is an important class for using LLVM in a threaded context.
Definition: LLVMContext.h:48
bool isExtInLoc() const
MVT getLocVT() const
MachineFrameInfo & getFrameInfo()
getFrameInfo - Return the frame info object for the current function.
LLVM_ATTRIBUTE_ALWAYS_INLINE iterator begin()
Definition: SmallVector.h:115
unsigned getInRegsParamsProcessed() const
bool isVarArg() const
uint32_t Offset
static const unsigned End
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.
unsigned getNextStackOffset() const
getNextStackOffset - Return the next stack offset such that all stack slots satisfy their alignment r...
TargetRegisterInfo base class - We assume that the target defines a static array of TargetRegisterDes...
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.
bool needsCustom() const
void getRemainingRegParmsForType(SmallVectorImpl< MCPhysReg > &Regs, MVT VT, CCAssignFn Fn)
Compute the remaining unused register parameters that would be used for the given value type...
unsigned getExtraInfo() const
CCState - This class holds information needed while lowering arguments and return values...
void AnalyzeArguments(const SmallVectorImpl< ISD::OutputArg > &Outs, CCAssignFn Fn)
The function will invoke AnalyzeCallOperands.
unsigned AllocateRegBlock(ArrayRef< MCPhysReg > Regs, unsigned RegsRequired)
AllocateRegBlock - Attempt to allocate a block of RegsRequired consecutive registers.
CCValAssign - Represent assignment of one arg/retval to a location.
CCState(CallingConv::ID CC, bool isVarArg, MachineFunction &MF, SmallVectorImpl< CCValAssign > &locs, LLVMContext &C)
static GCRegistry::Add< ShadowStackGC > C("shadow-stack","Very portable GC for uncooperative code generators")
void swap(llvm::BitVector &LHS, llvm::BitVector &RHS)
Implement std::swap in terms of BitVector swap.
Definition: BitVector.h:586
unsigned AllocateStack(unsigned Size, unsigned Align, unsigned ShadowReg)
Version of AllocateStack with extra register to be shadowed.
bool isMemLoc() const
void AnalyzeCallOperands(const SmallVectorImpl< ISD::OutputArg > &Outs, CCAssignFn Fn)
AnalyzeCallOperands - Analyze the outgoing arguments to a call, incorporating info about the passed v...
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...
LLVM_ATTRIBUTE_ALWAYS_INLINE iterator end()
Definition: SmallVector.h:119
void ensureMaxAlignment(unsigned Align)
Make sure the function is at least Align bytes aligned.
unsigned AllocateStack(unsigned Size, unsigned Align, ArrayRef< MCPhysReg > ShadowRegs)
Version of AllocateStack with list of extra registers to be shadowed.
static CCValAssign getCustomMem(unsigned ValNo, MVT ValVT, unsigned Offset, MVT LocVT, LocInfo HTP)
void AnalyzeReturn(const SmallVectorImpl< ISD::OutputArg > &Outs, CCAssignFn Fn)
AnalyzeReturn - Analyze the returned values of a return, incorporating info about the result values i...
LLVM_ATTRIBUTE_ALWAYS_INLINE size_type size() const
Definition: SmallVector.h:135
bool isAllocated(unsigned Reg) const
isAllocated - Return true if the specified register (or an alias) is allocated.
ParmContext CallOrPrologue
static CCValAssign getMem(unsigned ValNo, MVT ValVT, unsigned Offset, MVT LocVT, LocInfo HTP)
void AnalyzeArguments(const SmallVectorImpl< ISD::InputArg > &Ins, CCAssignFn Fn)
The function will invoke AnalyzeFormalArguments.
void clearByValRegsInfo()
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
void rewindByValRegsInfo()
unsigned getLocMemOffset() const
unsigned AllocateReg(unsigned Reg)
AllocateReg - Attempt to allocate one register.
static GCRegistry::Add< ErlangGC > A("erlang","erlang-compatible garbage collector")
unsigned AllocateStack(unsigned Size, unsigned Align)
AllocateStack - Allocate a chunk of stack space with the specified size and alignment.
void convertToReg(unsigned RegNo)
void ensureMaxAlignment(unsigned Align)