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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XX XX
XX Lower XX
XX XX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
*/
#ifndef _LOWER_H_
#define _LOWER_H_
#include "compiler.h"
#include "phase.h"
#include "lsra.h"
class Lowering : public Phase
{
public:
inline Lowering(Compiler* compiler, LinearScanInterface* lsra)
: Phase(compiler, "Lowering", PHASE_LOWERING),
vtableCallTemp(BAD_VAR_NUM)
{
m_lsra = (LinearScan *)lsra;
assert(m_lsra);
}
virtual void DoPhase();
// If requiresOverflowCheck is false, all other values will be unset
struct CastInfo
{
bool requiresOverflowCheck; // Will the cast require an overflow check
bool unsignedSource; // Is the source unsigned
bool unsignedDest; // is the dest unsigned
// All other fields are only meaningful if requiresOverflowCheck is set.
ssize_t typeMin; // Lowest storable value of the dest type
ssize_t typeMax; // Highest storable value of the dest type
ssize_t typeMask; // For converting from/to unsigned
bool signCheckOnly; // For converting between unsigned/signed int
};
#ifdef _TARGET_64BIT_
static void getCastDescription(GenTreePtr treeNode, CastInfo* castInfo);
#endif // _TARGET_64BIT_
private:
// Friends
static Compiler::fgWalkResult LowerNodeHelper (GenTreePtr* ppTree, Compiler::fgWalkData* data);
static Compiler::fgWalkResult TreeInfoInitHelper(GenTreePtr* ppTree, Compiler::fgWalkData* data);
// Member Functions
void LowerNode(GenTreePtr* tree, Compiler::fgWalkData* data);
GenTreeStmt* LowerMorphAndSeqTree(GenTree *tree);
void CheckVSQuirkStackPaddingNeeded(GenTreeCall* call);
// ------------------------------
// Call Lowering
// ------------------------------
void LowerCall (GenTree* call);
void LowerJmpMethod (GenTree* jmp);
void LowerRet (GenTree* ret);
GenTree* LowerDelegateInvoke (GenTreeCall* call);
GenTree* LowerIndirectNonvirtCall (GenTreeCall* call);
GenTree* LowerDirectCall (GenTreeCall* call);
GenTree* LowerNonvirtPinvokeCall (GenTreeCall* call);
GenTree* LowerTailCallViaHelper (GenTreeCall* callNode, GenTree *callTarget);
void LowerFastTailCall (GenTreeCall* callNode);
void InsertProfTailCallHook (GenTreeCall* callNode, GenTree *insertionPoint);
GenTree* LowerVirtualVtableCall (GenTreeCall* call);
GenTree* LowerVirtualStubCall (GenTreeCall* call);
void LowerArgsForCall (GenTreeCall* call);
GenTree* NewPutArg (GenTreeCall* call, GenTreePtr arg, fgArgTabEntryPtr info, var_types type);
void LowerArg (GenTreeCall* call, GenTreePtr *ppTree);
void InsertPInvokeCallProlog (GenTreeCall* call);
void InsertPInvokeCallEpilog (GenTreeCall* call);
void InsertPInvokeMethodProlog();
void InsertPInvokeMethodEpilog(BasicBlock *returnBB DEBUGARG(GenTreePtr lastExpr));
GenTree *SetGCState(int cns);
GenTree *CreateReturnTrapSeq();
enum FrameLinkAction { PushFrame, PopFrame };
GenTree *CreateFrameLinkUpdate(FrameLinkAction);
GenTree *AddrGen(ssize_t addr, regNumber reg = REG_NA);
GenTree *AddrGen(void *addr, regNumber reg = REG_NA);
// return concatenation of two trees, which currently uses a comma and really should not
// because we're not supposed to have commas in codegen
GenTree *Concat(GenTree *first, GenTree *second)
{
// if any is null, it must be the first
if (first == nullptr)
{
return second;
}
else if (second == nullptr)
{
return first;
}
else
{
return comp->gtNewOperNode(GT_COMMA, TYP_I_IMPL, first, second);
}
}
GenTree* Ind(GenTree* tree)
{
return comp->gtNewOperNode(GT_IND, TYP_I_IMPL, tree);
}
GenTree* PhysReg(regNumber reg, var_types type = TYP_I_IMPL)
{
return comp->gtNewPhysRegNode(reg, type);
}
GenTree* PhysRegDst(regNumber reg, GenTree* src)
{
return comp->gtNewPhysRegNode(reg, src);
}
GenTree* ThisReg(GenTreeCall* call)
{
return PhysReg(comp->codeGen->genGetThisArgReg(call), TYP_REF);
}
GenTree* Offset(GenTree* base, unsigned offset)
{
var_types resultType = (base->TypeGet() == TYP_REF) ? TYP_BYREF : base->TypeGet();
return new(comp, GT_LEA) GenTreeAddrMode(resultType, base, nullptr, 0, offset);
}
// returns true if the tree can use the read-modify-write memory instruction form
bool isRMWRegOper(GenTreePtr tree);
// return true if this call target is within range of a pc-rel call on the machine
bool IsCallTargetInRange(void *addr);
void TreeNodeInfoInit(GenTree* stmt);
void TreeNodeInfoInit(GenTreePtr* tree, GenTree* parent);
#if defined(_TARGET_XARCH_)
void TreeNodeInfoInitSimple(GenTree* tree);
void SetRegOptionalForBinOp(GenTree* tree);
void TryToSetRegOptional(GenTree* operand);
#endif // defined(_TARGET_XARCH_)
void TreeNodeInfoInitReturn(GenTree* tree);
void TreeNodeInfoInitShiftRotate(GenTree* tree);
void TreeNodeInfoInitCall(GenTreeCall* call);
void TreeNodeInfoInitBlockStore(GenTreeBlkOp* blkNode);
void TreeNodeInfoInitLogicalOp(GenTree* tree);
void TreeNodeInfoInitModDiv(GenTree* tree);
void TreeNodeInfoInitIntrinsic(GenTree* tree);
#ifdef FEATURE_SIMD
void TreeNodeInfoInitSIMD(GenTree* tree);
#endif // FEATURE_SIMD
void TreeNodeInfoInitCast(GenTree* tree);
#ifdef _TARGET_ARM64_
void TreeNodeInfoInitPutArgStk(GenTree* argNode, fgArgTabEntryPtr info);
#endif // _TARGET_ARM64_
#ifdef FEATURE_UNIX_AMD64_STRUCT_PASSING
void TreeNodeInfoInitPutArgStk(GenTree* tree);
#endif // FEATURE_UNIX_AMD64_STRUCT_PASSING
void TreeNodeInfoInitLclHeap(GenTree* tree);
void SpliceInUnary(GenTreePtr parent, GenTreePtr* ppChild, GenTreePtr newNode);
void DumpNodeInfoMap();
// Per tree node member functions
void LowerInd(GenTreePtr* ppTree);
void LowerAddrMode(GenTreePtr* ppTree, GenTree* before, Compiler::fgWalkData* data, bool isIndir);
void LowerAdd(GenTreePtr* ppTree, Compiler::fgWalkData* data);
void LowerUnsignedDivOrMod(GenTree* tree);
void LowerSignedDivOrMod(GenTreePtr* ppTree, Compiler::fgWalkData* data);
// Remove the nodes that are no longer used after an addressing mode is constructed under a GT_IND
void LowerIndCleanupHelper(GenTreeAddrMode* addrMode, GenTreePtr tree);
void LowerSwitch(GenTreePtr* ppTree);
void LowerCast(GenTreePtr* ppTree);
void LowerCntBlockOp(GenTreePtr* ppTree);
void SetMulOpCounts(GenTreePtr tree);
void LowerCmp(GenTreePtr tree);
#if !CPU_LOAD_STORE_ARCH
bool IsBinOpInRMWStoreInd(GenTreePtr tree);
bool IsRMWMemOpRootedAtStoreInd(GenTreePtr storeIndTree, GenTreePtr *indirCandidate, GenTreePtr *indirOpSource);
bool SetStoreIndOpCountsIfRMWMemOp(GenTreePtr storeInd);
#endif
void LowerStoreLoc(GenTreeLclVarCommon* tree);
void SetIndirAddrOpCounts(GenTree *indirTree);
void LowerGCWriteBarrier(GenTree *tree);
void LowerArrElem(GenTree **ppTree, Compiler::fgWalkData* data);
void LowerRotate(GenTree *tree);
// Utility functions
void MorphBlkIntoHelperCall (GenTreePtr pTree, GenTreePtr treeStmt);
public:
static bool IndirsAreEquivalent (GenTreePtr pTreeA, GenTreePtr pTreeB);
private:
static bool NodesAreEquivalentLeaves (GenTreePtr candidate, GenTreePtr storeInd);
GenTreePtr CreateLocalTempAsg (GenTreePtr rhs, unsigned refCount, GenTreePtr *ppLclVar = nullptr);
GenTreeStmt* CreateTemporary (GenTree** ppTree);
bool AreSourcesPossiblyModified (GenTree* use, GenTree* src1, GenTree *src2);
void ReplaceNode (GenTree** ppTreeLocation,
GenTree* replacementNode,
GenTree* stmt,
BasicBlock* block);
void UnlinkNode (GenTree** ppParentLink, GenTree* stmt, BasicBlock* block);
// return true if 'childNode' is an immediate that can be contained
// by the 'parentNode' (i.e. folded into an instruction)
// for example small enough and non-relocatable
bool IsContainableImmed(GenTree* parentNode, GenTree* childNode);
// Makes 'childNode' contained in the 'parentNode'
void MakeSrcContained(GenTreePtr parentNode, GenTreePtr childNode);
// Checks and makes 'childNode' contained in the 'parentNode'
bool CheckImmedAndMakeContained(GenTree* parentNode, GenTree* childNode);
// Checks for memory conflicts in the instructions between childNode and parentNode, and returns true if childNode can be contained.
bool IsSafeToContainMem(GenTree* parentNode, GenTree* childNode);
LinearScan *m_lsra;
BasicBlock *currBlock;
unsigned vtableCallTemp; // local variable we use as a temp for vtable calls
};
#endif // _LOWER_H_
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