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Dan Gohman456e2812009-03-31 16:51:18 +00001//===-- CallingConvLower.cpp - Calling Conventions ------------------------===//
Chris Lattner362e98a2007-02-27 04:43:02 +00002//
3// The LLVM Compiler Infrastructure
4//
Chris Lattner4ee451d2007-12-29 20:36:04 +00005// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
Chris Lattner362e98a2007-02-27 04:43:02 +00007//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the CCState class, used for lowering and implementing
11// calling conventions.
12//
13//===----------------------------------------------------------------------===//
14
15#include "llvm/CodeGen/CallingConvLower.h"
Eric Christopher471e4222011-06-08 23:55:35 +000016#include "llvm/CodeGen/MachineFrameInfo.h"
David Greenead61b122010-01-05 01:24:50 +000017#include "llvm/Support/Debug.h"
Torok Edwin7d696d82009-07-11 13:10:19 +000018#include "llvm/Support/ErrorHandling.h"
19#include "llvm/Support/raw_ostream.h"
Dan Gohman6f0d0242008-02-10 18:45:23 +000020#include "llvm/Target/TargetRegisterInfo.h"
Evan Chengc67e6e82008-01-15 03:14:05 +000021#include "llvm/Target/TargetData.h"
Chris Lattner13513b72007-02-27 05:13:54 +000022#include "llvm/Target/TargetMachine.h"
Stuart Hastingsf222e592011-02-28 17:17:53 +000023#include "llvm/Target/TargetLowering.h"
Chris Lattner362e98a2007-02-27 04:43:02 +000024using namespace llvm;
25
Eric Christopher471e4222011-06-08 23:55:35 +000026CCState::CCState(CallingConv::ID CC, bool isVarArg, MachineFunction &mf,
Cameron Zwaricha0f803a2011-06-10 20:31:39 +000027 const TargetMachine &tm, SmallVector<CCValAssign, 16> &locs,
28 LLVMContext &C)
Eric Christopher471e4222011-06-08 23:55:35 +000029 : CallingConv(CC), IsVarArg(isVarArg), MF(mf), TM(tm),
Stuart Hastingsc7315872011-04-20 16:47:52 +000030 TRI(*TM.getRegisterInfo()), Locs(locs), Context(C),
Cameron Zwaricha50760f2011-06-10 20:37:36 +000031 CallOrPrologue(Unknown) {
Chris Lattner362e98a2007-02-27 04:43:02 +000032 // No stack is used.
33 StackOffset = 0;
Eric Christopher471e4222011-06-08 23:55:35 +000034
Stuart Hastingsc7315872011-04-20 16:47:52 +000035 clearFirstByValReg();
Dan Gohman117b64b2008-06-30 20:25:31 +000036 UsedRegs.resize((TRI.getNumRegs()+31)/32);
Chris Lattner362e98a2007-02-27 04:43:02 +000037}
38
Eric Christopher471e4222011-06-08 23:55:35 +000039// HandleByVal - Allocate space on the stack large enough to pass an argument
40// by value. The size and alignment information of the argument is encoded in
41// its parameter attribute.
Duncan Sands1e96bab2010-11-04 10:49:57 +000042void CCState::HandleByVal(unsigned ValNo, MVT ValVT,
Duncan Sands1440e8b2010-11-03 11:35:31 +000043 MVT LocVT, CCValAssign::LocInfo LocInfo,
Evan Cheng4c46fc62008-01-15 07:49:36 +000044 int MinSize, int MinAlign,
Duncan Sands276dcbd2008-03-21 09:14:45 +000045 ISD::ArgFlagsTy ArgFlags) {
46 unsigned Align = ArgFlags.getByValAlign();
47 unsigned Size = ArgFlags.getByValSize();
Evan Cheng4c46fc62008-01-15 07:49:36 +000048 if (MinSize > (int)Size)
49 Size = MinSize;
50 if (MinAlign > (int)Align)
51 Align = MinAlign;
Eric Christopher622ab4a2011-06-09 15:39:01 +000052 if (MF.getFrameInfo()->getMaxAlignment() < Align)
53 MF.getFrameInfo()->setMaxAlignment(Align);
Cameron Zwarichcbd09bd2011-06-10 20:30:08 +000054 TM.getTargetLowering()->HandleByVal(this, Size);
Stuart Hastings2aa0f232011-05-26 04:09:49 +000055 unsigned Offset = AllocateStack(Size, Align);
56 addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
Rafael Espindola594d37e2007-08-10 14:44:42 +000057}
Chris Lattner362e98a2007-02-27 04:43:02 +000058
59/// MarkAllocated - Mark a register and all of its aliases as allocated.
60void CCState::MarkAllocated(unsigned Reg) {
Craig Toppere4fd9072012-03-04 10:43:23 +000061 for (const uint16_t *Alias = TRI.getOverlaps(Reg);
Jakob Stoklund Oleseneb7464e2010-12-14 23:28:01 +000062 unsigned Reg = *Alias; ++Alias)
63 UsedRegs[Reg/32] |= 1 << (Reg&31);
Chris Lattner362e98a2007-02-27 04:43:02 +000064}
Chris Lattnerfb39f992007-02-28 06:56:37 +000065
Dan Gohman98ca4f22009-08-05 01:29:28 +000066/// AnalyzeFormalArguments - Analyze an array of argument values,
Chris Lattner66baf262007-02-28 07:09:40 +000067/// incorporating info about the formals into this state.
Dan Gohman98ca4f22009-08-05 01:29:28 +000068void
69CCState::AnalyzeFormalArguments(const SmallVectorImpl<ISD::InputArg> &Ins,
70 CCAssignFn Fn) {
71 unsigned NumArgs = Ins.size();
72
Chris Lattner66baf262007-02-28 07:09:40 +000073 for (unsigned i = 0; i != NumArgs; ++i) {
Duncan Sands1440e8b2010-11-03 11:35:31 +000074 MVT ArgVT = Ins[i].VT;
Dan Gohman98ca4f22009-08-05 01:29:28 +000075 ISD::ArgFlagsTy ArgFlags = Ins[i].Flags;
Chris Lattner66baf262007-02-28 07:09:40 +000076 if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this)) {
Torok Edwinc23197a2009-07-14 16:55:14 +000077#ifndef NDEBUG
David Greenead61b122010-01-05 01:24:50 +000078 dbgs() << "Formal argument #" << i << " has unhandled type "
Duncan Sands1440e8b2010-11-03 11:35:31 +000079 << EVT(ArgVT).getEVTString();
Torok Edwinc23197a2009-07-14 16:55:14 +000080#endif
81 llvm_unreachable(0);
Chris Lattner66baf262007-02-28 07:09:40 +000082 }
83 }
84}
85
Kenneth Uildriksb4997ae2009-11-07 02:11:54 +000086/// CheckReturn - Analyze the return values of a function, returning true if
87/// the return can be performed without sret-demotion, and false otherwise.
Dan Gohman84023e02010-07-10 09:00:22 +000088bool CCState::CheckReturn(const SmallVectorImpl<ISD::OutputArg> &Outs,
Kenneth Uildriksb4997ae2009-11-07 02:11:54 +000089 CCAssignFn Fn) {
90 // Determine which register each value should be copied into.
Dan Gohman84023e02010-07-10 09:00:22 +000091 for (unsigned i = 0, e = Outs.size(); i != e; ++i) {
Duncan Sands1440e8b2010-11-03 11:35:31 +000092 MVT VT = Outs[i].VT;
Dan Gohman84023e02010-07-10 09:00:22 +000093 ISD::ArgFlagsTy ArgFlags = Outs[i].Flags;
Kenneth Uildriksb4997ae2009-11-07 02:11:54 +000094 if (Fn(i, VT, VT, CCValAssign::Full, ArgFlags, *this))
95 return false;
96 }
97 return true;
98}
99
Dan Gohman98ca4f22009-08-05 01:29:28 +0000100/// AnalyzeReturn - Analyze the returned values of a return,
Chris Lattner66baf262007-02-28 07:09:40 +0000101/// incorporating info about the result values into this state.
Dan Gohman98ca4f22009-08-05 01:29:28 +0000102void CCState::AnalyzeReturn(const SmallVectorImpl<ISD::OutputArg> &Outs,
103 CCAssignFn Fn) {
Chris Lattner66baf262007-02-28 07:09:40 +0000104 // Determine which register each value should be copied into.
Dan Gohman98ca4f22009-08-05 01:29:28 +0000105 for (unsigned i = 0, e = Outs.size(); i != e; ++i) {
Duncan Sands1440e8b2010-11-03 11:35:31 +0000106 MVT VT = Outs[i].VT;
Dan Gohmanaa8c1942010-07-06 15:39:54 +0000107 ISD::ArgFlagsTy ArgFlags = Outs[i].Flags;
108 if (Fn(i, VT, VT, CCValAssign::Full, ArgFlags, *this)) {
109#ifndef NDEBUG
110 dbgs() << "Return operand #" << i << " has unhandled type "
Duncan Sands1440e8b2010-11-03 11:35:31 +0000111 << EVT(VT).getEVTString();
Dan Gohmanaa8c1942010-07-06 15:39:54 +0000112#endif
113 llvm_unreachable(0);
114 }
115 }
116}
117
Dan Gohman98ca4f22009-08-05 01:29:28 +0000118/// AnalyzeCallOperands - Analyze the outgoing arguments to a call,
119/// incorporating info about the passed values into this state.
120void CCState::AnalyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> &Outs,
121 CCAssignFn Fn) {
122 unsigned NumOps = Outs.size();
Chris Lattnerfb39f992007-02-28 06:56:37 +0000123 for (unsigned i = 0; i != NumOps; ++i) {
Duncan Sands1440e8b2010-11-03 11:35:31 +0000124 MVT ArgVT = Outs[i].VT;
Dan Gohmanaa8c1942010-07-06 15:39:54 +0000125 ISD::ArgFlagsTy ArgFlags = Outs[i].Flags;
126 if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this)) {
127#ifndef NDEBUG
128 dbgs() << "Call operand #" << i << " has unhandled type "
Duncan Sands1440e8b2010-11-03 11:35:31 +0000129 << EVT(ArgVT).getEVTString();
Dan Gohmanaa8c1942010-07-06 15:39:54 +0000130#endif
131 llvm_unreachable(0);
132 }
133 }
134}
135
Evan Chengc89d2fe2008-09-05 16:59:26 +0000136/// AnalyzeCallOperands - Same as above except it takes vectors of types
137/// and argument flags.
Duncan Sands1440e8b2010-11-03 11:35:31 +0000138void CCState::AnalyzeCallOperands(SmallVectorImpl<MVT> &ArgVTs,
Evan Chengc89d2fe2008-09-05 16:59:26 +0000139 SmallVectorImpl<ISD::ArgFlagsTy> &Flags,
140 CCAssignFn Fn) {
141 unsigned NumOps = ArgVTs.size();
142 for (unsigned i = 0; i != NumOps; ++i) {
Duncan Sands1440e8b2010-11-03 11:35:31 +0000143 MVT ArgVT = ArgVTs[i];
Evan Chengc89d2fe2008-09-05 16:59:26 +0000144 ISD::ArgFlagsTy ArgFlags = Flags[i];
145 if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this)) {
Torok Edwinc23197a2009-07-14 16:55:14 +0000146#ifndef NDEBUG
David Greenead61b122010-01-05 01:24:50 +0000147 dbgs() << "Call operand #" << i << " has unhandled type "
Duncan Sands1440e8b2010-11-03 11:35:31 +0000148 << EVT(ArgVT).getEVTString();
Torok Edwinc23197a2009-07-14 16:55:14 +0000149#endif
150 llvm_unreachable(0);
Evan Chengc89d2fe2008-09-05 16:59:26 +0000151 }
152 }
153}
154
Dan Gohman98ca4f22009-08-05 01:29:28 +0000155/// AnalyzeCallResult - Analyze the return values of a call,
Chris Lattner66baf262007-02-28 07:09:40 +0000156/// incorporating info about the passed values into this state.
Dan Gohman98ca4f22009-08-05 01:29:28 +0000157void CCState::AnalyzeCallResult(const SmallVectorImpl<ISD::InputArg> &Ins,
158 CCAssignFn Fn) {
159 for (unsigned i = 0, e = Ins.size(); i != e; ++i) {
Duncan Sands1440e8b2010-11-03 11:35:31 +0000160 MVT VT = Ins[i].VT;
Dan Gohman98ca4f22009-08-05 01:29:28 +0000161 ISD::ArgFlagsTy Flags = Ins[i].Flags;
Dale Johannesen86098bd2008-09-26 19:31:26 +0000162 if (Fn(i, VT, VT, CCValAssign::Full, Flags, *this)) {
Torok Edwinc23197a2009-07-14 16:55:14 +0000163#ifndef NDEBUG
David Greenead61b122010-01-05 01:24:50 +0000164 dbgs() << "Call result #" << i << " has unhandled type "
Eric Christopher0795abd2011-03-04 22:47:12 +0000165 << EVT(VT).getEVTString() << "\n";
Torok Edwinc23197a2009-07-14 16:55:14 +0000166#endif
167 llvm_unreachable(0);
Chris Lattnerfb39f992007-02-28 06:56:37 +0000168 }
169 }
170}
Evan Chengc7fcfa02008-09-07 09:02:18 +0000171
172/// AnalyzeCallResult - Same as above except it's specialized for calls which
173/// produce a single value.
Duncan Sands1440e8b2010-11-03 11:35:31 +0000174void CCState::AnalyzeCallResult(MVT VT, CCAssignFn Fn) {
Evan Chengc7fcfa02008-09-07 09:02:18 +0000175 if (Fn(0, VT, VT, CCValAssign::Full, ISD::ArgFlagsTy(), *this)) {
Torok Edwinc23197a2009-07-14 16:55:14 +0000176#ifndef NDEBUG
David Greenead61b122010-01-05 01:24:50 +0000177 dbgs() << "Call result has unhandled type "
Duncan Sands1440e8b2010-11-03 11:35:31 +0000178 << EVT(VT).getEVTString();
Torok Edwinc23197a2009-07-14 16:55:14 +0000179#endif
180 llvm_unreachable(0);
Evan Chengc7fcfa02008-09-07 09:02:18 +0000181 }
182}