#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/IR/CallingConv.h"
+#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/Target/TargetCallingConv.h"
namespace llvm {
// There is no need to differentiate between a pending CCValAssign and other
// kinds, as they are stored in a different list.
static CCValAssign getPending(unsigned ValNo, MVT ValVT, MVT LocVT,
- LocInfo HTP) {
- return getReg(ValNo, ValVT, 0, LocVT, HTP);
+ LocInfo HTP, unsigned ExtraInfo = 0) {
+ return getReg(ValNo, ValVT, ExtraInfo, LocVT, HTP);
}
void convertToReg(unsigned RegNo) {
unsigned getLocReg() const { assert(isRegLoc()); return Loc; }
unsigned getLocMemOffset() const { assert(isMemLoc()); return Loc; }
+ unsigned getExtraInfo() const { return Loc; }
MVT getLocVT() const { return LocVT; }
LocInfo getLocInfo() const { return HTP; }
}
};
+/// Describes a register that needs to be forwarded from the prologue to a
+/// musttail call.
+struct ForwardedRegister {
+ ForwardedRegister(unsigned VReg, MCPhysReg PReg, MVT VT)
+ : VReg(VReg), PReg(PReg), VT(VT) {}
+ unsigned VReg;
+ MCPhysReg PReg;
+ MVT VT;
+};
+
/// CCAssignFn - This function assigns a location for Val, updating State to
/// reflect the change. It returns 'true' if it failed to handle Val.
typedef bool CCAssignFn(unsigned ValNo, MVT ValVT,
LLVMContext &Context;
unsigned StackOffset;
+ unsigned MaxStackArgAlign;
SmallVector<uint32_t, 16> UsedRegs;
SmallVector<CCValAssign, 4> PendingLocs;
// while "%t" goes to the stack: it wouldn't be described in ByValRegs.
//
// Supposed use-case for this collection:
- // 1. Initially ByValRegs is empty, InRegsParamsProceed is 0.
+ // 1. Initially ByValRegs is empty, InRegsParamsProcessed is 0.
// 2. HandleByVal fillups ByValRegs.
// 3. Argument analysis (LowerFormatArguments, for example). After
- // some byval argument was analyzed, InRegsParamsProceed is increased.
+ // some byval argument was analyzed, InRegsParamsProcessed is increased.
struct ByValInfo {
ByValInfo(unsigned B, unsigned E, bool IsWaste = false) :
Begin(B), End(E), Waste(IsWaste) {}
};
SmallVector<ByValInfo, 4 > ByValRegs;
- // InRegsParamsProceed - shows how many instances of ByValRegs was proceed
+ // InRegsParamsProcessed - shows how many instances of ByValRegs was proceed
// during argument analysis.
- unsigned InRegsParamsProceed;
+ unsigned InRegsParamsProcessed;
protected:
ParmContext CallOrPrologue;
CallingConv::ID getCallingConv() const { return CallingConv; }
bool isVarArg() const { return IsVarArg; }
- unsigned getNextStackOffset() const { return StackOffset; }
+ /// getNextStackOffset - Return the next stack offset such that all stack
+ /// slots satisfy their alignment requirements.
+ unsigned getNextStackOffset() const {
+ return StackOffset;
+ }
+
+ /// 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.
+ unsigned getAlignedCallFrameSize() const {
+ return RoundUpToAlignment(StackOffset, MaxStackArgAlign);
+ }
/// isAllocated - Return true if the specified register (or an alias) is
/// allocated.
/// produce a single value.
void AnalyzeCallResult(MVT VT, CCAssignFn Fn);
- /// getFirstUnallocated - Return the first unallocated register in the set, or
- /// NumRegs if they are all allocated.
- unsigned getFirstUnallocated(const MCPhysReg *Regs, unsigned NumRegs) const {
- for (unsigned i = 0; i != NumRegs; ++i)
+ /// getFirstUnallocated - Return the index of the first unallocated register
+ /// in the set, or Regs.size() if they are all allocated.
+ unsigned getFirstUnallocated(ArrayRef<MCPhysReg> Regs) const {
+ for (unsigned i = 0; i < Regs.size(); ++i)
if (!isAllocated(Regs[i]))
return i;
- return NumRegs;
+ return Regs.size();
}
/// AllocateReg - Attempt to allocate one register. If it is not available,
/// 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.
- unsigned AllocateReg(const MCPhysReg *Regs, unsigned NumRegs) {
- unsigned FirstUnalloc = getFirstUnallocated(Regs, NumRegs);
- if (FirstUnalloc == NumRegs)
+ unsigned AllocateReg(ArrayRef<MCPhysReg> Regs) {
+ unsigned FirstUnalloc = getFirstUnallocated(Regs);
+ if (FirstUnalloc == Regs.size())
return 0; // Didn't find the reg.
// Mark the register and any aliases as allocated.
/// 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.
- unsigned AllocateRegBlock(const uint16_t *Regs, unsigned NumRegs, unsigned RegsRequired) {
- for (unsigned StartIdx = 0; StartIdx <= NumRegs - RegsRequired; ++StartIdx) {
+ unsigned AllocateRegBlock(ArrayRef<uint16_t> Regs, unsigned RegsRequired) {
+ if (RegsRequired > Regs.size())
+ return 0;
+
+ for (unsigned StartIdx = 0; StartIdx <= Regs.size() - RegsRequired;
+ ++StartIdx) {
bool BlockAvailable = true;
// Check for already-allocated regs in this block
for (unsigned BlockIdx = 0; BlockIdx < RegsRequired; ++BlockIdx) {
}
/// Version of AllocateReg with list of registers to be shadowed.
- unsigned AllocateReg(const MCPhysReg *Regs, const MCPhysReg *ShadowRegs,
- unsigned NumRegs) {
- unsigned FirstUnalloc = getFirstUnallocated(Regs, NumRegs);
- if (FirstUnalloc == NumRegs)
+ unsigned AllocateReg(ArrayRef<MCPhysReg> Regs, const MCPhysReg *ShadowRegs) {
+ unsigned FirstUnalloc = getFirstUnallocated(Regs);
+ if (FirstUnalloc == Regs.size())
return 0; // Didn't find the reg.
// Mark the register and any aliases as allocated.
/// and alignment.
unsigned AllocateStack(unsigned Size, unsigned Align) {
assert(Align && ((Align - 1) & Align) == 0); // Align is power of 2.
- StackOffset = ((StackOffset + Align - 1) & ~(Align - 1));
+ StackOffset = RoundUpToAlignment(StackOffset, Align);
unsigned Result = StackOffset;
StackOffset += Size;
+ MaxStackArgAlign = std::max(Align, MaxStackArgAlign);
MF.getFrameInfo()->ensureMaxAlignment(Align);
return Result;
}
/// Version of AllocateStack with list of extra registers to be shadowed.
/// Note that, unlike AllocateReg, this shadows ALL of the shadow registers.
unsigned AllocateStack(unsigned Size, unsigned Align,
- const MCPhysReg *ShadowRegs, unsigned NumShadowRegs) {
- for (unsigned i = 0; i < NumShadowRegs; ++i)
+ ArrayRef<MCPhysReg> ShadowRegs) {
+ for (unsigned i = 0; i < ShadowRegs.size(); ++i)
MarkAllocated(ShadowRegs[i]);
return AllocateStack(Size, Align);
}
unsigned getInRegsParamsCount() const { return ByValRegs.size(); }
// Returns count of byval in-regs arguments proceed.
- unsigned getInRegsParamsProceed() const { return InRegsParamsProceed; }
+ unsigned getInRegsParamsProcessed() const { return InRegsParamsProcessed; }
// Get information about N-th byval parameter that is stored in registers.
// Here "ByValParamIndex" is N.
// Returns false, if end is reached.
bool nextInRegsParam() {
unsigned e = ByValRegs.size();
- if (InRegsParamsProceed < e)
- ++InRegsParamsProceed;
- return InRegsParamsProceed < e;
+ if (InRegsParamsProcessed < e)
+ ++InRegsParamsProcessed;
+ return InRegsParamsProcessed < e;
}
// Clear byval registers tracking info.
void clearByValRegsInfo() {
- InRegsParamsProceed = 0;
+ InRegsParamsProcessed = 0;
ByValRegs.clear();
}
// Rewind byval registers tracking info.
void rewindByValRegsInfo() {
- InRegsParamsProceed = 0;
+ InRegsParamsProcessed = 0;
}
ParmContext getCallOrPrologue() const { return CallOrPrologue; }
return PendingLocs;
}
+ /// 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.
+ void getRemainingRegParmsForType(SmallVectorImpl<MCPhysReg> &Regs, MVT VT,
+ CCAssignFn Fn);
+
+ /// Compute the set of registers that need to be preserved and forwarded to
+ /// any musttail calls.
+ void analyzeMustTailForwardedRegisters(
+ SmallVectorImpl<ForwardedRegister> &Forwards, ArrayRef<MVT> RegParmTypes,
+ CCAssignFn Fn);
+
private:
/// MarkAllocated - Mark a register and all of its aliases as allocated.
void MarkAllocated(unsigned Reg);
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