2009-03-31 16:51:18 +00:00
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//===-- CallingConvLower.cpp - Calling Conventions ------------------------===//
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2007-02-27 04:43:02 +00:00
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//
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// The LLVM Compiler Infrastructure
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//
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2007-12-29 20:36:04 +00:00
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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2007-02-27 04:43:02 +00:00
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the CCState class, used for lowering and implementing
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// calling conventions.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/CallingConvLower.h"
|
2011-06-08 23:55:35 +00:00
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#include "llvm/CodeGen/MachineFrameInfo.h"
|
2014-12-22 23:58:37 +00:00
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#include "llvm/CodeGen/MachineRegisterInfo.h"
|
2013-01-02 11:36:10 +00:00
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#include "llvm/IR/DataLayout.h"
|
2010-01-05 01:24:50 +00:00
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|
#include "llvm/Support/Debug.h"
|
2009-07-11 13:10:19 +00:00
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#include "llvm/Support/ErrorHandling.h"
|
2014-12-22 23:58:37 +00:00
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#include "llvm/Support/SaveAndRestore.h"
|
2009-07-11 13:10:19 +00:00
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#include "llvm/Support/raw_ostream.h"
|
2011-02-28 17:17:53 +00:00
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#include "llvm/Target/TargetLowering.h"
|
2012-12-03 16:50:05 +00:00
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#include "llvm/Target/TargetRegisterInfo.h"
|
2014-08-04 21:25:23 +00:00
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#include "llvm/Target/TargetSubtargetInfo.h"
|
2007-02-27 04:43:02 +00:00
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using namespace llvm;
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|
2011-06-08 23:55:35 +00:00
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CCState::CCState(CallingConv::ID CC, bool isVarArg, MachineFunction &mf,
|
2014-08-06 18:45:26 +00:00
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SmallVectorImpl<CCValAssign> &locs, LLVMContext &C)
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: CallingConv(CC), IsVarArg(isVarArg), MF(mf),
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TRI(*MF.getSubtarget().getRegisterInfo()), Locs(locs), Context(C),
|
2014-08-04 21:25:23 +00:00
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CallOrPrologue(Unknown) {
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2007-02-27 04:43:02 +00:00
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// No stack is used.
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StackOffset = 0;
|
2011-06-08 23:55:35 +00:00
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2013-05-05 07:48:36 +00:00
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clearByValRegsInfo();
|
2008-06-30 20:25:31 +00:00
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UsedRegs.resize((TRI.getNumRegs()+31)/32);
|
2007-02-27 04:43:02 +00:00
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}
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|
2011-06-08 23:55:35 +00:00
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// HandleByVal - Allocate space on the stack large enough to pass an argument
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// by value. The size and alignment information of the argument is encoded in
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// its parameter attribute.
|
2010-11-04 10:49:57 +00:00
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void CCState::HandleByVal(unsigned ValNo, MVT ValVT,
|
2010-11-03 11:35:31 +00:00
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MVT LocVT, CCValAssign::LocInfo LocInfo,
|
2008-01-15 07:49:36 +00:00
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int MinSize, int MinAlign,
|
2008-03-21 09:14:45 +00:00
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ISD::ArgFlagsTy ArgFlags) {
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unsigned Align = ArgFlags.getByValAlign();
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unsigned Size = ArgFlags.getByValSize();
|
2008-01-15 07:49:36 +00:00
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if (MinSize > (int)Size)
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Size = MinSize;
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if (MinAlign > (int)Align)
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Align = MinAlign;
|
2012-06-19 22:59:12 +00:00
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MF.getFrameInfo()->ensureMaxAlignment(Align);
|
2014-08-06 18:45:26 +00:00
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MF.getSubtarget().getTargetLowering()->HandleByVal(this, Size, Align);
|
2014-08-06 17:57:23 +00:00
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Size = unsigned(RoundUpToAlignment(Size, MinAlign));
|
2011-05-26 04:09:49 +00:00
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unsigned Offset = AllocateStack(Size, Align);
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addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
|
2007-08-10 14:44:42 +00:00
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}
|
2007-02-27 04:43:02 +00:00
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/// MarkAllocated - Mark a register and all of its aliases as allocated.
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void CCState::MarkAllocated(unsigned Reg) {
|
2012-06-01 23:28:30 +00:00
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for (MCRegAliasIterator AI(Reg, &TRI, true); AI.isValid(); ++AI)
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UsedRegs[*AI/32] |= 1 << (*AI&31);
|
2007-02-27 04:43:02 +00:00
|
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|
}
|
2007-02-28 06:56:37 +00:00
|
|
|
|
Major calling convention code refactoring.
Instead of awkwardly encoding calling-convention information with ISD::CALL,
ISD::FORMAL_ARGUMENTS, ISD::RET, and ISD::ARG_FLAGS nodes, TargetLowering
provides three virtual functions for targets to override:
LowerFormalArguments, LowerCall, and LowerRet, which replace the custom
lowering done on the special nodes. They provide the same information, but
in a more immediately usable format.
This also reworks much of the target-independent tail call logic. The
decision of whether or not to perform a tail call is now cleanly split
between target-independent portions, and the target dependent portion
in IsEligibleForTailCallOptimization.
This also synchronizes all in-tree targets, to help enable future
refactoring and feature work.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78142 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-05 01:29:28 +00:00
|
|
|
/// AnalyzeFormalArguments - Analyze an array of argument values,
|
2007-02-28 07:09:40 +00:00
|
|
|
/// incorporating info about the formals into this state.
|
Major calling convention code refactoring.
Instead of awkwardly encoding calling-convention information with ISD::CALL,
ISD::FORMAL_ARGUMENTS, ISD::RET, and ISD::ARG_FLAGS nodes, TargetLowering
provides three virtual functions for targets to override:
LowerFormalArguments, LowerCall, and LowerRet, which replace the custom
lowering done on the special nodes. They provide the same information, but
in a more immediately usable format.
This also reworks much of the target-independent tail call logic. The
decision of whether or not to perform a tail call is now cleanly split
between target-independent portions, and the target dependent portion
in IsEligibleForTailCallOptimization.
This also synchronizes all in-tree targets, to help enable future
refactoring and feature work.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78142 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-05 01:29:28 +00:00
|
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void
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CCState::AnalyzeFormalArguments(const SmallVectorImpl<ISD::InputArg> &Ins,
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|
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CCAssignFn Fn) {
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unsigned NumArgs = Ins.size();
|
|
|
|
|
2007-02-28 07:09:40 +00:00
|
|
|
for (unsigned i = 0; i != NumArgs; ++i) {
|
2010-11-03 11:35:31 +00:00
|
|
|
MVT ArgVT = Ins[i].VT;
|
Major calling convention code refactoring.
Instead of awkwardly encoding calling-convention information with ISD::CALL,
ISD::FORMAL_ARGUMENTS, ISD::RET, and ISD::ARG_FLAGS nodes, TargetLowering
provides three virtual functions for targets to override:
LowerFormalArguments, LowerCall, and LowerRet, which replace the custom
lowering done on the special nodes. They provide the same information, but
in a more immediately usable format.
This also reworks much of the target-independent tail call logic. The
decision of whether or not to perform a tail call is now cleanly split
between target-independent portions, and the target dependent portion
in IsEligibleForTailCallOptimization.
This also synchronizes all in-tree targets, to help enable future
refactoring and feature work.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78142 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-05 01:29:28 +00:00
|
|
|
ISD::ArgFlagsTy ArgFlags = Ins[i].Flags;
|
2007-02-28 07:09:40 +00:00
|
|
|
if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this)) {
|
2009-07-14 16:55:14 +00:00
|
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|
#ifndef NDEBUG
|
2010-01-05 01:24:50 +00:00
|
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|
dbgs() << "Formal argument #" << i << " has unhandled type "
|
2012-11-14 05:20:09 +00:00
|
|
|
<< EVT(ArgVT).getEVTString() << '\n';
|
2009-07-14 16:55:14 +00:00
|
|
|
#endif
|
2014-04-14 00:51:57 +00:00
|
|
|
llvm_unreachable(nullptr);
|
2007-02-28 07:09:40 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2009-11-07 02:11:54 +00:00
|
|
|
/// CheckReturn - Analyze the return values of a function, returning true if
|
|
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/// the return can be performed without sret-demotion, and false otherwise.
|
2010-07-10 09:00:22 +00:00
|
|
|
bool CCState::CheckReturn(const SmallVectorImpl<ISD::OutputArg> &Outs,
|
2009-11-07 02:11:54 +00:00
|
|
|
CCAssignFn Fn) {
|
|
|
|
// Determine which register each value should be copied into.
|
2010-07-10 09:00:22 +00:00
|
|
|
for (unsigned i = 0, e = Outs.size(); i != e; ++i) {
|
2010-11-03 11:35:31 +00:00
|
|
|
MVT VT = Outs[i].VT;
|
2010-07-10 09:00:22 +00:00
|
|
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ISD::ArgFlagsTy ArgFlags = Outs[i].Flags;
|
2009-11-07 02:11:54 +00:00
|
|
|
if (Fn(i, VT, VT, CCValAssign::Full, ArgFlags, *this))
|
|
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|
return false;
|
|
|
|
}
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
Major calling convention code refactoring.
Instead of awkwardly encoding calling-convention information with ISD::CALL,
ISD::FORMAL_ARGUMENTS, ISD::RET, and ISD::ARG_FLAGS nodes, TargetLowering
provides three virtual functions for targets to override:
LowerFormalArguments, LowerCall, and LowerRet, which replace the custom
lowering done on the special nodes. They provide the same information, but
in a more immediately usable format.
This also reworks much of the target-independent tail call logic. The
decision of whether or not to perform a tail call is now cleanly split
between target-independent portions, and the target dependent portion
in IsEligibleForTailCallOptimization.
This also synchronizes all in-tree targets, to help enable future
refactoring and feature work.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78142 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-05 01:29:28 +00:00
|
|
|
/// AnalyzeReturn - Analyze the returned values of a return,
|
2007-02-28 07:09:40 +00:00
|
|
|
/// incorporating info about the result values into this state.
|
Major calling convention code refactoring.
Instead of awkwardly encoding calling-convention information with ISD::CALL,
ISD::FORMAL_ARGUMENTS, ISD::RET, and ISD::ARG_FLAGS nodes, TargetLowering
provides three virtual functions for targets to override:
LowerFormalArguments, LowerCall, and LowerRet, which replace the custom
lowering done on the special nodes. They provide the same information, but
in a more immediately usable format.
This also reworks much of the target-independent tail call logic. The
decision of whether or not to perform a tail call is now cleanly split
between target-independent portions, and the target dependent portion
in IsEligibleForTailCallOptimization.
This also synchronizes all in-tree targets, to help enable future
refactoring and feature work.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78142 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-05 01:29:28 +00:00
|
|
|
void CCState::AnalyzeReturn(const SmallVectorImpl<ISD::OutputArg> &Outs,
|
|
|
|
CCAssignFn Fn) {
|
2007-02-28 07:09:40 +00:00
|
|
|
// Determine which register each value should be copied into.
|
2010-07-06 15:39:54 +00:00
|
|
|
for (unsigned i = 0, e = Outs.size(); i != e; ++i) {
|
2010-11-03 11:35:31 +00:00
|
|
|
MVT VT = Outs[i].VT;
|
2010-07-06 15:39:54 +00:00
|
|
|
ISD::ArgFlagsTy ArgFlags = Outs[i].Flags;
|
|
|
|
if (Fn(i, VT, VT, CCValAssign::Full, ArgFlags, *this)) {
|
|
|
|
#ifndef NDEBUG
|
|
|
|
dbgs() << "Return operand #" << i << " has unhandled type "
|
2012-11-14 05:20:09 +00:00
|
|
|
<< EVT(VT).getEVTString() << '\n';
|
2010-07-06 15:39:54 +00:00
|
|
|
#endif
|
2014-04-14 00:51:57 +00:00
|
|
|
llvm_unreachable(nullptr);
|
2010-07-06 15:39:54 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
Major calling convention code refactoring.
Instead of awkwardly encoding calling-convention information with ISD::CALL,
ISD::FORMAL_ARGUMENTS, ISD::RET, and ISD::ARG_FLAGS nodes, TargetLowering
provides three virtual functions for targets to override:
LowerFormalArguments, LowerCall, and LowerRet, which replace the custom
lowering done on the special nodes. They provide the same information, but
in a more immediately usable format.
This also reworks much of the target-independent tail call logic. The
decision of whether or not to perform a tail call is now cleanly split
between target-independent portions, and the target dependent portion
in IsEligibleForTailCallOptimization.
This also synchronizes all in-tree targets, to help enable future
refactoring and feature work.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78142 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-05 01:29:28 +00:00
|
|
|
/// AnalyzeCallOperands - Analyze the outgoing arguments to a call,
|
|
|
|
/// incorporating info about the passed values into this state.
|
|
|
|
void CCState::AnalyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> &Outs,
|
|
|
|
CCAssignFn Fn) {
|
|
|
|
unsigned NumOps = Outs.size();
|
2010-07-06 15:39:54 +00:00
|
|
|
for (unsigned i = 0; i != NumOps; ++i) {
|
2010-11-03 11:35:31 +00:00
|
|
|
MVT ArgVT = Outs[i].VT;
|
2010-07-06 15:39:54 +00:00
|
|
|
ISD::ArgFlagsTy ArgFlags = Outs[i].Flags;
|
|
|
|
if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this)) {
|
|
|
|
#ifndef NDEBUG
|
|
|
|
dbgs() << "Call operand #" << i << " has unhandled type "
|
2012-11-14 05:20:09 +00:00
|
|
|
<< EVT(ArgVT).getEVTString() << '\n';
|
2010-07-06 15:39:54 +00:00
|
|
|
#endif
|
2014-04-14 00:51:57 +00:00
|
|
|
llvm_unreachable(nullptr);
|
2010-07-06 15:39:54 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-09-05 16:59:26 +00:00
|
|
|
/// AnalyzeCallOperands - Same as above except it takes vectors of types
|
|
|
|
/// and argument flags.
|
2010-11-03 11:35:31 +00:00
|
|
|
void CCState::AnalyzeCallOperands(SmallVectorImpl<MVT> &ArgVTs,
|
2008-09-05 16:59:26 +00:00
|
|
|
SmallVectorImpl<ISD::ArgFlagsTy> &Flags,
|
|
|
|
CCAssignFn Fn) {
|
|
|
|
unsigned NumOps = ArgVTs.size();
|
|
|
|
for (unsigned i = 0; i != NumOps; ++i) {
|
2010-11-03 11:35:31 +00:00
|
|
|
MVT ArgVT = ArgVTs[i];
|
2008-09-05 16:59:26 +00:00
|
|
|
ISD::ArgFlagsTy ArgFlags = Flags[i];
|
|
|
|
if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this)) {
|
2009-07-14 16:55:14 +00:00
|
|
|
#ifndef NDEBUG
|
2010-01-05 01:24:50 +00:00
|
|
|
dbgs() << "Call operand #" << i << " has unhandled type "
|
2012-11-14 05:20:09 +00:00
|
|
|
<< EVT(ArgVT).getEVTString() << '\n';
|
2009-07-14 16:55:14 +00:00
|
|
|
#endif
|
2014-04-14 00:51:57 +00:00
|
|
|
llvm_unreachable(nullptr);
|
2008-09-05 16:59:26 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
Major calling convention code refactoring.
Instead of awkwardly encoding calling-convention information with ISD::CALL,
ISD::FORMAL_ARGUMENTS, ISD::RET, and ISD::ARG_FLAGS nodes, TargetLowering
provides three virtual functions for targets to override:
LowerFormalArguments, LowerCall, and LowerRet, which replace the custom
lowering done on the special nodes. They provide the same information, but
in a more immediately usable format.
This also reworks much of the target-independent tail call logic. The
decision of whether or not to perform a tail call is now cleanly split
between target-independent portions, and the target dependent portion
in IsEligibleForTailCallOptimization.
This also synchronizes all in-tree targets, to help enable future
refactoring and feature work.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78142 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-05 01:29:28 +00:00
|
|
|
/// AnalyzeCallResult - Analyze the return values of a call,
|
2007-02-28 07:09:40 +00:00
|
|
|
/// incorporating info about the passed values into this state.
|
Major calling convention code refactoring.
Instead of awkwardly encoding calling-convention information with ISD::CALL,
ISD::FORMAL_ARGUMENTS, ISD::RET, and ISD::ARG_FLAGS nodes, TargetLowering
provides three virtual functions for targets to override:
LowerFormalArguments, LowerCall, and LowerRet, which replace the custom
lowering done on the special nodes. They provide the same information, but
in a more immediately usable format.
This also reworks much of the target-independent tail call logic. The
decision of whether or not to perform a tail call is now cleanly split
between target-independent portions, and the target dependent portion
in IsEligibleForTailCallOptimization.
This also synchronizes all in-tree targets, to help enable future
refactoring and feature work.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78142 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-05 01:29:28 +00:00
|
|
|
void CCState::AnalyzeCallResult(const SmallVectorImpl<ISD::InputArg> &Ins,
|
|
|
|
CCAssignFn Fn) {
|
|
|
|
for (unsigned i = 0, e = Ins.size(); i != e; ++i) {
|
2010-11-03 11:35:31 +00:00
|
|
|
MVT VT = Ins[i].VT;
|
Major calling convention code refactoring.
Instead of awkwardly encoding calling-convention information with ISD::CALL,
ISD::FORMAL_ARGUMENTS, ISD::RET, and ISD::ARG_FLAGS nodes, TargetLowering
provides three virtual functions for targets to override:
LowerFormalArguments, LowerCall, and LowerRet, which replace the custom
lowering done on the special nodes. They provide the same information, but
in a more immediately usable format.
This also reworks much of the target-independent tail call logic. The
decision of whether or not to perform a tail call is now cleanly split
between target-independent portions, and the target dependent portion
in IsEligibleForTailCallOptimization.
This also synchronizes all in-tree targets, to help enable future
refactoring and feature work.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78142 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-05 01:29:28 +00:00
|
|
|
ISD::ArgFlagsTy Flags = Ins[i].Flags;
|
2008-09-26 19:31:26 +00:00
|
|
|
if (Fn(i, VT, VT, CCValAssign::Full, Flags, *this)) {
|
2009-07-14 16:55:14 +00:00
|
|
|
#ifndef NDEBUG
|
2010-01-05 01:24:50 +00:00
|
|
|
dbgs() << "Call result #" << i << " has unhandled type "
|
2012-11-14 05:20:09 +00:00
|
|
|
<< EVT(VT).getEVTString() << '\n';
|
2009-07-14 16:55:14 +00:00
|
|
|
#endif
|
2014-04-14 00:51:57 +00:00
|
|
|
llvm_unreachable(nullptr);
|
2007-02-28 06:56:37 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2008-09-07 09:02:18 +00:00
|
|
|
|
|
|
|
/// AnalyzeCallResult - Same as above except it's specialized for calls which
|
|
|
|
/// produce a single value.
|
2010-11-03 11:35:31 +00:00
|
|
|
void CCState::AnalyzeCallResult(MVT VT, CCAssignFn Fn) {
|
2008-09-07 09:02:18 +00:00
|
|
|
if (Fn(0, VT, VT, CCValAssign::Full, ISD::ArgFlagsTy(), *this)) {
|
2009-07-14 16:55:14 +00:00
|
|
|
#ifndef NDEBUG
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2010-01-05 01:24:50 +00:00
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dbgs() << "Call result has unhandled type "
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2012-11-14 05:20:09 +00:00
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<< EVT(VT).getEVTString() << '\n';
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2009-07-14 16:55:14 +00:00
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#endif
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2014-04-14 00:51:57 +00:00
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llvm_unreachable(nullptr);
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2008-09-07 09:02:18 +00:00
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}
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}
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2014-12-22 23:58:37 +00:00
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void CCState::getRemainingRegParmsForType(SmallVectorImpl<MCPhysReg> &Regs,
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MVT VT, CCAssignFn Fn) {
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unsigned SavedStackOffset = StackOffset;
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unsigned NumLocs = Locs.size();
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// Allocate something of this value type repeatedly with just the inreg flag
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// set until we get assigned a location in memory.
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ISD::ArgFlagsTy Flags;
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Flags.setInReg();
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bool HaveRegParm = true;
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while (HaveRegParm) {
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if (Fn(0, VT, VT, CCValAssign::Full, Flags, *this)) {
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#ifndef NDEBUG
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dbgs() << "Call has unhandled type " << EVT(VT).getEVTString()
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<< " while computing remaining regparms\n";
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#endif
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llvm_unreachable(nullptr);
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}
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HaveRegParm = Locs.back().isRegLoc();
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}
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// Copy all the registers from the value locations we added.
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assert(NumLocs < Locs.size() && "CC assignment failed to add location");
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for (unsigned I = NumLocs, E = Locs.size(); I != E; ++I)
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if (Locs[I].isRegLoc())
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Regs.push_back(MCPhysReg(Locs[I].getLocReg()));
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// Clear the assigned values and stack memory. We leave the registers marked
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// as allocated so that future queries don't return the same registers, i.e.
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// when i64 and f64 are both passed in GPRs.
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StackOffset = SavedStackOffset;
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Locs.resize(NumLocs);
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}
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void CCState::analyzeMustTailForwardedRegisters(
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SmallVectorImpl<ForwardedRegister> &Forwards, ArrayRef<MVT> RegParmTypes,
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CCAssignFn Fn) {
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// Oftentimes calling conventions will not user register parameters for
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// variadic functions, so we need to assume we're not variadic so that we get
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// all the registers that might be used in a non-variadic call.
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SaveAndRestore<bool> SavedVarArg(IsVarArg, false);
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for (MVT RegVT : RegParmTypes) {
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SmallVector<MCPhysReg, 8> RemainingRegs;
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getRemainingRegParmsForType(RemainingRegs, RegVT, Fn);
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const TargetLowering *TL = MF.getSubtarget().getTargetLowering();
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const TargetRegisterClass *RC = TL->getRegClassFor(RegVT);
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for (MCPhysReg PReg : RemainingRegs) {
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unsigned VReg = MF.addLiveIn(PReg, RC);
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Forwards.push_back(ForwardedRegister(VReg, PReg, RegVT));
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}
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}
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}
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