--- /dev/null
+//===-- llvm/CallingConvLower.cpp - Calling Convention lowering -----------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the Hexagon_CCState class, used for lowering and
+// implementing calling conventions. Adapted from the machine independent
+// version of the class (CCState) but this handles calls to varargs functions
+//
+//===----------------------------------------------------------------------===//
+
+#include "HexagonCallingConvLower.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+#include "Hexagon.h"
+using namespace llvm;
+
+Hexagon_CCState::Hexagon_CCState(CallingConv::ID CC, bool isVarArg,
+ const TargetMachine &tm,
+ SmallVector<CCValAssign, 16> &locs,
+ LLVMContext &c)
+ : CallingConv(CC), IsVarArg(isVarArg), TM(tm),
+ TRI(*TM.getRegisterInfo()), Locs(locs), Context(c) {
+ // No stack is used.
+ StackOffset = 0;
+
+ UsedRegs.resize((TRI.getNumRegs()+31)/32);
+}
+
+// HandleByVal - Allocate a stack slot large enough to pass an argument by
+// value. The size and alignment information of the argument is encoded in its
+// parameter attribute.
+void Hexagon_CCState::HandleByVal(unsigned ValNo, EVT ValVT,
+ EVT LocVT, CCValAssign::LocInfo LocInfo,
+ int MinSize, int MinAlign,
+ ISD::ArgFlagsTy ArgFlags) {
+ unsigned Align = ArgFlags.getByValAlign();
+ unsigned Size = ArgFlags.getByValSize();
+ if (MinSize > (int)Size)
+ Size = MinSize;
+ if (MinAlign > (int)Align)
+ Align = MinAlign;
+ unsigned Offset = AllocateStack(Size, Align);
+
+ addLoc(CCValAssign::getMem(ValNo, ValVT.getSimpleVT(), Offset,
+ LocVT.getSimpleVT(), LocInfo));
+}
+
+/// MarkAllocated - Mark a register and all of its aliases as allocated.
+void Hexagon_CCState::MarkAllocated(unsigned Reg) {
+ UsedRegs[Reg/32] |= 1 << (Reg&31);
+
+ if (const unsigned *RegAliases = TRI.getAliasSet(Reg))
+ for (; (Reg = *RegAliases); ++RegAliases)
+ UsedRegs[Reg/32] |= 1 << (Reg&31);
+}
+
+/// AnalyzeFormalArguments - Analyze an ISD::FORMAL_ARGUMENTS node,
+/// incorporating info about the formals into this state.
+void
+Hexagon_CCState::AnalyzeFormalArguments(const SmallVectorImpl<ISD::InputArg>
+ &Ins,
+ Hexagon_CCAssignFn Fn,
+ unsigned SretValueInRegs) {
+ unsigned NumArgs = Ins.size();
+ unsigned i = 0;
+
+ // If the function returns a small struct in registers, skip
+ // over the first (dummy) argument.
+ if (SretValueInRegs != 0) {
+ ++i;
+ }
+
+
+ for (; i != NumArgs; ++i) {
+ EVT ArgVT = Ins[i].VT;
+ ISD::ArgFlagsTy ArgFlags = Ins[i].Flags;
+ if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this, 0, 0, false)) {
+ dbgs() << "Formal argument #" << i << " has unhandled type "
+ << ArgVT.getEVTString() << "\n";
+ abort();
+ }
+ }
+}
+
+/// AnalyzeReturn - Analyze the returned values of an ISD::RET node,
+/// incorporating info about the result values into this state.
+void
+Hexagon_CCState::AnalyzeReturn(const SmallVectorImpl<ISD::OutputArg> &Outs,
+ Hexagon_CCAssignFn Fn,
+ unsigned SretValueInRegs) {
+
+ // For Hexagon, Return small structures in registers.
+ if (SretValueInRegs != 0) {
+ if (SretValueInRegs <= 32) {
+ unsigned Reg = Hexagon::R0;
+ addLoc(CCValAssign::getReg(0, MVT::i32, Reg, MVT::i32,
+ CCValAssign::Full));
+ return;
+ }
+ if (SretValueInRegs <= 64) {
+ unsigned Reg = Hexagon::D0;
+ addLoc(CCValAssign::getReg(0, MVT::i64, Reg, MVT::i64,
+ CCValAssign::Full));
+ return;
+ }
+ }
+
+
+ // Determine which register each value should be copied into.
+ for (unsigned i = 0, e = Outs.size(); i != e; ++i) {
+ EVT VT = Outs[i].VT;
+ ISD::ArgFlagsTy ArgFlags = Outs[i].Flags;
+ if (Fn(i, VT, VT, CCValAssign::Full, ArgFlags, *this, -1, -1, false)){
+ dbgs() << "Return operand #" << i << " has unhandled type "
+ << VT.getEVTString() << "\n";
+ abort();
+ }
+ }
+}
+
+
+/// AnalyzeCallOperands - Analyze an ISD::CALL node, incorporating info
+/// about the passed values into this state.
+void
+Hexagon_CCState::AnalyzeCallOperands(const SmallVectorImpl<ISD::OutputArg>
+ &Outs,
+ Hexagon_CCAssignFn Fn,
+ int NonVarArgsParams,
+ unsigned SretValueSize) {
+ unsigned NumOps = Outs.size();
+
+ unsigned i = 0;
+ // If the called function returns a small struct in registers, skip
+ // the first actual parameter. We do not want to pass a pointer to
+ // the stack location.
+ if (SretValueSize != 0) {
+ ++i;
+ }
+
+ for (; i != NumOps; ++i) {
+ EVT ArgVT = Outs[i].VT;
+ ISD::ArgFlagsTy ArgFlags = Outs[i].Flags;
+ if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this,
+ NonVarArgsParams, i+1, false)) {
+ dbgs() << "Call operand #" << i << " has unhandled type "
+ << ArgVT.getEVTString() << "\n";
+ abort();
+ }
+ }
+}
+
+/// AnalyzeCallOperands - Same as above except it takes vectors of types
+/// and argument flags.
+void
+Hexagon_CCState::AnalyzeCallOperands(SmallVectorImpl<EVT> &ArgVTs,
+ SmallVectorImpl<ISD::ArgFlagsTy> &Flags,
+ Hexagon_CCAssignFn Fn) {
+ unsigned NumOps = ArgVTs.size();
+ for (unsigned i = 0; i != NumOps; ++i) {
+ EVT ArgVT = ArgVTs[i];
+ ISD::ArgFlagsTy ArgFlags = Flags[i];
+ if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this, -1, -1,
+ false)) {
+ dbgs() << "Call operand #" << i << " has unhandled type "
+ << ArgVT.getEVTString() << "\n";
+ abort();
+ }
+ }
+}
+
+/// AnalyzeCallResult - Analyze the return values of an ISD::CALL node,
+/// incorporating info about the passed values into this state.
+void
+Hexagon_CCState::AnalyzeCallResult(const SmallVectorImpl<ISD::InputArg> &Ins,
+ Hexagon_CCAssignFn Fn,
+ unsigned SretValueInRegs) {
+
+ for (unsigned i = 0, e = Ins.size(); i != e; ++i) {
+ EVT VT = Ins[i].VT;
+ ISD::ArgFlagsTy Flags = ISD::ArgFlagsTy();
+ if (Fn(i, VT, VT, CCValAssign::Full, Flags, *this, -1, -1, false)) {
+ dbgs() << "Call result #" << i << " has unhandled type "
+ << VT.getEVTString() << "\n";
+ abort();
+ }
+ }
+}
+
+/// AnalyzeCallResult - Same as above except it's specialized for calls which
+/// produce a single value.
+void Hexagon_CCState::AnalyzeCallResult(EVT VT, Hexagon_CCAssignFn Fn) {
+ if (Fn(0, VT, VT, CCValAssign::Full, ISD::ArgFlagsTy(), *this, -1, -1,
+ false)) {
+ dbgs() << "Call result has unhandled type "
+ << VT.getEVTString() << "\n";
+ abort();
+ }
+}
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