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codegencommon.cpp
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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.
/*XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XX XX
XX Code Generator Common: XX
XX Methods common to all architectures and register allocation strategies XX
XX XX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
*/
// TODO-Cleanup: There are additional methods in CodeGen*.cpp that are almost
// identical, and which should probably be moved here.
#include "jitpch.h"
#ifdef _MSC_VER
#pragma hdrstop
#endif
#include "codegen.h"
#include "gcinfo.h"
#include "emit.h"
#ifndef JIT32_GCENCODER
#include "gcinfoencoder.h"
#endif
#include "patchpointinfo.h"
#include "optcse.h" // for cse metrics
/*****************************************************************************/
void CodeGenInterface::setFramePointerRequiredEH(bool value)
{
m_cgFramePointerRequired = value;
#ifndef JIT32_GCENCODER
if (value)
{
// EnumGcRefs will only enumerate slots in aborted frames
// if they are fully-interruptible. So if we have a catch
// or finally that will keep frame-vars alive, we need to
// force fully-interruptible.
#ifdef DEBUG
if (verbose)
{
printf("Method has EH, marking method as fully interruptible\n");
}
#endif
m_cgInterruptible = true;
}
#endif // JIT32_GCENCODER
}
/*****************************************************************************/
CodeGenInterface* getCodeGenerator(Compiler* comp)
{
return new (comp, CMK_Codegen) CodeGen(comp);
}
// CodeGen constructor
CodeGenInterface::CodeGenInterface(Compiler* theCompiler)
: gcInfo(theCompiler)
, regSet(theCompiler, gcInfo)
, compiler(theCompiler)
, treeLifeUpdater(nullptr)
{
}
#if defined(TARGET_XARCH)
void CodeGenInterface::CopyRegisterInfo()
{
#if defined(TARGET_AMD64)
rbmAllFloat = compiler->rbmAllFloat;
rbmFltCalleeTrash = compiler->rbmFltCalleeTrash;
#endif // TARGET_AMD64
rbmAllMask = compiler->rbmAllMask;
rbmMskCalleeTrash = compiler->rbmMskCalleeTrash;
}
#endif // TARGET_XARCH
/*****************************************************************************/
CodeGen::CodeGen(Compiler* theCompiler)
: CodeGenInterface(theCompiler)
{
#if defined(TARGET_XARCH)
negBitmaskFlt = nullptr;
negBitmaskDbl = nullptr;
absBitmaskFlt = nullptr;
absBitmaskDbl = nullptr;
zroSimd12Elm3 = nullptr;
u8ToDblBitmask = nullptr;
#endif // defined(TARGET_XARCH)
#if defined(FEATURE_PUT_STRUCT_ARG_STK) && !defined(TARGET_X86)
m_stkArgVarNum = BAD_VAR_NUM;
#endif
#if defined(UNIX_X86_ABI)
curNestedAlignment = 0;
maxNestedAlignment = 0;
#endif
gcInfo.regSet = ®Set;
m_cgEmitter = new (compiler->getAllocator()) emitter();
m_cgEmitter->codeGen = this;
m_cgEmitter->gcInfo = &gcInfo;
#ifdef DEBUG
setVerbose(compiler->verbose);
#endif // DEBUG
regSet.tmpInit();
#ifdef LATE_DISASM
getDisAssembler().disInit(compiler);
#endif
#ifdef DEBUG
genTrnslLocalVarCount = 0;
// Shouldn't be used before it is set in genFnProlog()
compiler->compCalleeRegsPushed = UninitializedWord<unsigned>(compiler);
#if defined(TARGET_XARCH)
// Shouldn't be used before it is set in genFnProlog()
compiler->compCalleeFPRegsSavedMask = (regMaskTP)-1;
#endif // defined(TARGET_XARCH)
#endif // DEBUG
#ifdef TARGET_AMD64
// This will be set before final frame layout.
compiler->compVSQuirkStackPaddingNeeded = 0;
#endif // TARGET_AMD64
compiler->genCallSite2DebugInfoMap = nullptr;
/* Assume that we not fully interruptible */
SetInterruptible(false);
#if defined(TARGET_ARMARCH) || defined(TARGET_LOONGARCH64) || defined(TARGET_RISCV64)
SetHasTailCalls(false);
#endif // TARGET_ARMARCH || TARGET_LOONGARCH64 || TARGET_RISCV64
#ifdef DEBUG
genInterruptibleUsed = false;
genCurDispOffset = (unsigned)-1;
#endif
#ifdef TARGET_ARM64
genSaveFpLrWithAllCalleeSavedRegisters = false;
genForceFuncletFrameType5 = false;
#endif // TARGET_ARM64
}
#if defined(TARGET_X86) || defined(TARGET_ARM)
//---------------------------------------------------------------------
// genTotalFrameSize - return the "total" size of the stack frame, including local size
// and callee-saved register size. There are a few things "missing" depending on the
// platform. The function genCallerSPtoInitialSPdelta() includes those things.
//
// For ARM, this doesn't include the prespilled registers.
//
// For x86, this doesn't include the frame pointer if codeGen->isFramePointerUsed() is true.
// It also doesn't include the pushed return address.
//
// Return value:
// Frame size
int CodeGenInterface::genTotalFrameSize() const
{
assert(!IsUninitialized(compiler->compCalleeRegsPushed));
int totalFrameSize = compiler->compCalleeRegsPushed * REGSIZE_BYTES + compiler->compLclFrameSize;
assert(totalFrameSize >= 0);
return totalFrameSize;
}
//---------------------------------------------------------------------
// genSPtoFPdelta - return the offset from SP to the frame pointer.
// This number is going to be positive, since SP must be at the lowest
// address.
//
// There must be a frame pointer to call this function!
int CodeGenInterface::genSPtoFPdelta() const
{
assert(isFramePointerUsed());
int delta;
delta = -genCallerSPtoInitialSPdelta() + genCallerSPtoFPdelta();
assert(delta >= 0);
return delta;
}
//---------------------------------------------------------------------
// genCallerSPtoFPdelta - return the offset from Caller-SP to the frame pointer.
// This number is going to be negative, since the Caller-SP is at a higher
// address than the frame pointer.
//
// There must be a frame pointer to call this function!
int CodeGenInterface::genCallerSPtoFPdelta() const
{
assert(isFramePointerUsed());
int callerSPtoFPdelta = 0;
#if defined(TARGET_ARM)
// On ARM, we first push the prespill registers, then store LR, then R11 (FP), and point R11 at the saved R11.
callerSPtoFPdelta -= genCountBits(regSet.rsMaskPreSpillRegs(true)) * REGSIZE_BYTES;
callerSPtoFPdelta -= 2 * REGSIZE_BYTES;
#elif defined(TARGET_X86)
// Thanks to ebp chaining, the difference between ebp-based addresses
// and caller-SP-relative addresses is just the 2 pointers:
// return address
// pushed ebp
callerSPtoFPdelta -= 2 * REGSIZE_BYTES;
#else
#error "Unknown TARGET"
#endif // TARGET*
assert(callerSPtoFPdelta <= 0);
return callerSPtoFPdelta;
}
//---------------------------------------------------------------------
// genCallerSPtoInitialSPdelta - return the offset from Caller-SP to Initial SP.
//
// This number will be negative.
int CodeGenInterface::genCallerSPtoInitialSPdelta() const
{
int callerSPtoSPdelta = 0;
#if defined(TARGET_ARM)
callerSPtoSPdelta -= genCountBits(regSet.rsMaskPreSpillRegs(true)) * REGSIZE_BYTES;
callerSPtoSPdelta -= genTotalFrameSize();
#elif defined(TARGET_X86)
callerSPtoSPdelta -= genTotalFrameSize();
callerSPtoSPdelta -= REGSIZE_BYTES; // caller-pushed return address
// compCalleeRegsPushed does not account for the frame pointer
// TODO-Cleanup: shouldn't this be part of genTotalFrameSize?
if (isFramePointerUsed())
{
callerSPtoSPdelta -= REGSIZE_BYTES;
}
#else
#error "Unknown TARGET"
#endif // TARGET*
assert(callerSPtoSPdelta <= 0);
return callerSPtoSPdelta;
}
#endif // defined(TARGET_X86) || defined(TARGET_ARM)
/*****************************************************************************
*
* Initialize some global variables.
*/
void CodeGen::genPrepForCompiler()
{
treeLifeUpdater = new (compiler, CMK_bitset) TreeLifeUpdater<true>(compiler);
/* Figure out which non-register variables hold pointers */
VarSetOps::AssignNoCopy(compiler, gcInfo.gcTrkStkPtrLcls, VarSetOps::MakeEmpty(compiler));
// Also, initialize gcTrkStkPtrLcls to include all tracked variables that do not fully live
// in a register (i.e. they live on the stack for all or part of their lifetime).
// Note that lvRegister indicates that a lclVar is in a register for its entire lifetime.
unsigned varNum;
LclVarDsc* varDsc;
for (varNum = 0, varDsc = compiler->lvaTable; varNum < compiler->lvaCount; varNum++, varDsc++)
{
if (varDsc->lvTracked || varDsc->lvIsRegCandidate())
{
if (!varDsc->lvRegister && compiler->lvaIsGCTracked(varDsc))
{
VarSetOps::AddElemD(compiler, gcInfo.gcTrkStkPtrLcls, varDsc->lvVarIndex);
}
}
}
VarSetOps::AssignNoCopy(compiler, genLastLiveSet, VarSetOps::MakeEmpty(compiler));
genLastLiveMask = RBM_NONE;
compiler->Metrics.BasicBlocksAtCodegen = compiler->fgBBcount;
}
//------------------------------------------------------------------------
// genMarkLabelsForCodegen: Mark labels required for codegen.
//
// Mark all blocks that require a label with BBF_HAS_LABEL. These are either blocks that are:
// 1. the target of jumps (fall-through flow doesn't require a label),
// 2. referenced labels such as for "switch" codegen,
// 3. needed to denote the range of EH regions to the VM.
//
// No labels will be in the IR before now, but future codegen might annotate additional blocks
// with this flag, such as "switch" codegen, or codegen-created blocks from genCreateTempLabel().
//
// To report exception handling information to the VM, we need the size of the exception
// handling regions. To compute that, we need to emit labels for the beginning block of
// an EH region, and the block that immediately follows a region. Go through the EH
// table and mark all these blocks with BBF_HAS_LABEL to make this happen.
//
// This code is closely couple with genReportEH() in the sense that any block
// that this procedure has determined it needs to have a label has to be selected
// using the same logic both here and in genReportEH(), so basically any time there is
// a change in the way we handle EH reporting, we have to keep the logic of these two
// methods 'in sync'.
//
// No blocks should be added or removed after this.
//
void CodeGen::genMarkLabelsForCodegen()
{
assert(!compiler->fgSafeBasicBlockCreation);
JITDUMP("Mark labels for codegen\n");
#ifdef DEBUG
// No label flags should be set before this.
for (BasicBlock* const block : compiler->Blocks())
{
assert(!block->HasFlag(BBF_HAS_LABEL));
}
#endif // DEBUG
// The first block is special; it always needs a label. This is to properly set up GC info.
JITDUMP(" " FMT_BB " : first block\n", compiler->fgFirstBB->bbNum);
compiler->fgFirstBB->SetFlags(BBF_HAS_LABEL);
// The current implementation of switch tables requires the first block to have a label so it
// can generate offsets to the switch label targets.
// (This is duplicative with the fact we always set the first block with a label above.)
// TODO-CQ: remove this when switches have been re-implemented to not use this.
if (compiler->fgHasSwitch)
{
JITDUMP(" " FMT_BB " : function has switch; mark first block\n", compiler->fgFirstBB->bbNum);
compiler->fgFirstBB->SetFlags(BBF_HAS_LABEL);
}
for (BasicBlock* const block : compiler->Blocks())
{
switch (block->GetKind())
{
case BBJ_ALWAYS:
// If we can skip this jump, don't create a label for the target
if (block->CanRemoveJumpToNext(compiler))
{
break;
}
FALLTHROUGH;
case BBJ_EHCATCHRET:
JITDUMP(" " FMT_BB " : branch target\n", block->GetTarget()->bbNum);
block->GetTarget()->SetFlags(BBF_HAS_LABEL);
break;
case BBJ_COND:
JITDUMP(" " FMT_BB " : branch target\n", block->GetTrueTarget()->bbNum);
block->GetTrueTarget()->SetFlags(BBF_HAS_LABEL);
// If we need a jump to the false target, give it a label
if (!block->CanRemoveJumpToTarget(block->GetFalseTarget(), compiler))
{
JITDUMP(" " FMT_BB " : branch target\n", block->GetFalseTarget()->bbNum);
block->GetFalseTarget()->SetFlags(BBF_HAS_LABEL);
}
break;
case BBJ_SWITCH:
for (BasicBlock* const bTarget : block->SwitchTargets())
{
JITDUMP(" " FMT_BB " : switch target\n", bTarget->bbNum);
bTarget->SetFlags(BBF_HAS_LABEL);
}
break;
case BBJ_CALLFINALLY:
// The finally target itself will get marked by walking the EH table, below, and marking
// all handler begins.
if (compiler->UsesCallFinallyThunks())
{
// For callfinally thunks, we need to mark the block following the callfinally/callfinallyret pair,
// as that's needed for identifying the range of the "duplicate finally" region in EH data.
BasicBlock* bbToLabel = block->Next();
if (block->isBBCallFinallyPair())
{
bbToLabel = bbToLabel->Next(); // skip the BBJ_CALLFINALLYRET
}
if (bbToLabel != nullptr)
{
JITDUMP(" " FMT_BB " : callfinally thunk region end\n", bbToLabel->bbNum);
bbToLabel->SetFlags(BBF_HAS_LABEL);
}
}
break;
case BBJ_CALLFINALLYRET:
JITDUMP(" " FMT_BB " : finally continuation\n", block->GetFinallyContinuation()->bbNum);
block->GetFinallyContinuation()->SetFlags(BBF_HAS_LABEL);
break;
case BBJ_EHFINALLYRET:
case BBJ_EHFAULTRET:
case BBJ_EHFILTERRET: // The filter-handler will get marked when processing the EH handlers, below.
case BBJ_RETURN:
case BBJ_THROW:
break;
default:
noway_assert(!"Unexpected bbKind");
break;
}
}
// Walk all the exceptional code blocks and mark them, since they don't appear in the normal flow graph.
for (Compiler::AddCodeDsc* add = compiler->fgAddCodeList; add != nullptr; add = add->acdNext)
{
if (add->acdUsed)
{
JITDUMP(" " FMT_BB " : throw helper block\n", add->acdDstBlk->bbNum);
add->acdDstBlk->SetFlags(BBF_HAS_LABEL);
}
}
for (EHblkDsc* const HBtab : EHClauses(compiler))
{
HBtab->ebdTryBeg->SetFlags(BBF_HAS_LABEL);
HBtab->ebdHndBeg->SetFlags(BBF_HAS_LABEL);
JITDUMP(" " FMT_BB " : try begin\n", HBtab->ebdTryBeg->bbNum);
JITDUMP(" " FMT_BB " : hnd begin\n", HBtab->ebdHndBeg->bbNum);
if (!HBtab->ebdTryLast->IsLast())
{
HBtab->ebdTryLast->Next()->SetFlags(BBF_HAS_LABEL);
JITDUMP(" " FMT_BB " : try end\n", HBtab->ebdTryLast->Next()->bbNum);
}
if (!HBtab->ebdHndLast->IsLast())
{
HBtab->ebdHndLast->Next()->SetFlags(BBF_HAS_LABEL);
JITDUMP(" " FMT_BB " : hnd end\n", HBtab->ebdHndLast->Next()->bbNum);
}
if (HBtab->HasFilter())
{
HBtab->ebdFilter->SetFlags(BBF_HAS_LABEL);
JITDUMP(" " FMT_BB " : filter begin\n", HBtab->ebdFilter->bbNum);
}
}
#ifdef DEBUG
if (compiler->verbose)
{
printf("*************** After genMarkLabelsForCodegen()\n");
compiler->fgDispBasicBlocks();
}
#endif // DEBUG
}
void CodeGenInterface::genUpdateLife(GenTree* tree)
{
treeLifeUpdater->UpdateLife(tree);
}
void CodeGenInterface::genUpdateLife(VARSET_VALARG_TP newLife)
{
compiler->compUpdateLife</*ForCodeGen*/ true>(newLife);
}
// Return the register mask for the given register variable
// inline
regMaskTP CodeGenInterface::genGetRegMask(const LclVarDsc* varDsc)
{
regMaskTP regMask = RBM_NONE;
assert(varDsc->lvIsInReg());
regNumber reg = varDsc->GetRegNum();
if (genIsValidFloatReg(reg))
{
regMask = genRegMaskFloat(reg ARM_ARG(varDsc->GetRegisterType()));
}
else
{
regMask = genRegMask(reg);
}
return regMask;
}
// Return the register mask for the given lclVar or regVar tree node
// inline
regMaskTP CodeGenInterface::genGetRegMask(GenTree* tree)
{
assert(tree->gtOper == GT_LCL_VAR);
regMaskTP regMask = RBM_NONE;
const LclVarDsc* varDsc = compiler->lvaGetDesc(tree->AsLclVarCommon());
if (varDsc->lvPromoted)
{
for (unsigned i = varDsc->lvFieldLclStart; i < varDsc->lvFieldLclStart + varDsc->lvFieldCnt; ++i)
{
const LclVarDsc* fieldVarDsc = compiler->lvaGetDesc(i);
noway_assert(fieldVarDsc->lvIsStructField);
if (fieldVarDsc->lvIsInReg())
{
regMask |= genGetRegMask(fieldVarDsc);
}
}
}
else if (varDsc->lvIsInReg())
{
regMask = genGetRegMask(varDsc);
}
return regMask;
}
// The given lclVar is either going live (being born) or dying.
// It might be both going live and dying (that is, it is a dead store) under MinOpts.
// Update regSet.GetMaskVars() accordingly.
// inline
void CodeGenInterface::genUpdateRegLife(const LclVarDsc* varDsc, bool isBorn, bool isDying DEBUGARG(GenTree* tree))
{
regMaskTP regMask = genGetRegMask(varDsc);
#ifdef DEBUG
if (compiler->verbose)
{
printf("\t\t\t\t\t\t\tV%02u in reg ", compiler->lvaGetLclNum(varDsc));
varDsc->PrintVarReg();
printf(" is becoming %s ", (isDying) ? "dead" : "live");
Compiler::printTreeID(tree);
printf("\n");
}
#endif // DEBUG
if (isDying)
{
// We'd like to be able to assert the following, however if we are walking
// through a qmark/colon tree, we may encounter multiple last-use nodes.
// assert((regSet.GetMaskVars() & regMask) == regMask);
regSet.RemoveMaskVars(regMask);
}
else
{
// If this is going live, the register must not have a variable in it, except
// in the case of an exception or "spill at single-def" variable, which may be already treated
// as live in the register.
assert(varDsc->IsAlwaysAliveInMemory() || ((regSet.GetMaskVars() & regMask) == 0));
regSet.AddMaskVars(regMask);
}
}
//----------------------------------------------------------------------
// compHelperCallKillSet: Gets a register mask that represents the kill set for a helper call.
// Not all JIT Helper calls follow the standard ABI on the target architecture.
//
// Arguments:
// helper - The helper being inquired about
//
// Return Value:
// Mask of register kills -- registers whose values are no longer guaranteed to be the same.
//
regMaskTP Compiler::compHelperCallKillSet(CorInfoHelpFunc helper)
{
switch (helper)
{
// Most of the helpers are written in C++ and C# and we can't make
// any additional assumptions beyond the standard ABI. However, some are written in raw assembly,
// so we can narrow down the kill sets.
//
// TODO-CQ: Inspect all asm helpers and narrow down the kill sets for them.
//
case CORINFO_HELP_ASSIGN_REF:
case CORINFO_HELP_CHECKED_ASSIGN_REF:
return RBM_CALLEE_TRASH_WRITEBARRIER;
case CORINFO_HELP_ASSIGN_BYREF:
return RBM_CALLEE_TRASH_WRITEBARRIER_BYREF;
case CORINFO_HELP_PROF_FCN_ENTER:
return RBM_PROFILER_ENTER_TRASH;
case CORINFO_HELP_PROF_FCN_LEAVE:
return RBM_PROFILER_LEAVE_TRASH;
case CORINFO_HELP_PROF_FCN_TAILCALL:
return RBM_PROFILER_TAILCALL_TRASH;
#ifdef TARGET_X86
case CORINFO_HELP_ASSIGN_REF_EAX:
case CORINFO_HELP_ASSIGN_REF_ECX:
case CORINFO_HELP_ASSIGN_REF_EBX:
case CORINFO_HELP_ASSIGN_REF_EBP:
case CORINFO_HELP_ASSIGN_REF_ESI:
case CORINFO_HELP_ASSIGN_REF_EDI:
case CORINFO_HELP_CHECKED_ASSIGN_REF_EAX:
case CORINFO_HELP_CHECKED_ASSIGN_REF_ECX:
case CORINFO_HELP_CHECKED_ASSIGN_REF_EBX:
case CORINFO_HELP_CHECKED_ASSIGN_REF_EBP:
case CORINFO_HELP_CHECKED_ASSIGN_REF_ESI:
case CORINFO_HELP_CHECKED_ASSIGN_REF_EDI:
return RBM_EDX;
#endif
case CORINFO_HELP_STOP_FOR_GC:
return RBM_STOP_FOR_GC_TRASH;
case CORINFO_HELP_INIT_PINVOKE_FRAME:
return RBM_INIT_PINVOKE_FRAME_TRASH;
case CORINFO_HELP_VALIDATE_INDIRECT_CALL:
return RBM_VALIDATE_INDIRECT_CALL_TRASH;
default:
return RBM_CALLEE_TRASH;
}
}
//------------------------------------------------------------------------
// compChangeLife: Compare the given "newLife" with last set of live variables and update
// codeGen "gcInfo", siScopes, "regSet" with the new variable's homes/liveness.
//
// Arguments:
// newLife - the new set of variables that are alive.
//
// Assumptions:
// The set of live variables reflects the result of only emitted code, it should not be considering the becoming
// live/dead of instructions that has not been emitted yet. This is used to ensure [) "VariableLiveRange"
// intervals when calling "siStartVariableLiveRange" and "siEndVariableLiveRange".
//
// Notes:
// If "ForCodeGen" is false, only "compCurLife" set (and no mask) will be updated.
//
template <bool ForCodeGen>
void Compiler::compChangeLife(VARSET_VALARG_TP newLife)
{
#ifdef DEBUG
if (verbose)
{
printf("Change life %s ", VarSetOps::ToString(this, compCurLife));
dumpConvertedVarSet(this, compCurLife);
printf(" -> %s ", VarSetOps::ToString(this, newLife));
dumpConvertedVarSet(this, newLife);
printf("\n");
}
#endif // DEBUG
/* We should only be called when the live set has actually changed */
noway_assert(!VarSetOps::Equal(this, compCurLife, newLife));
if (!ForCodeGen)
{
VarSetOps::Assign(this, compCurLife, newLife);
return;
}
/* Figure out which variables are becoming live/dead at this point */
// deadSet = compCurLife - newLife
VARSET_TP deadSet(VarSetOps::Diff(this, compCurLife, newLife));
// bornSet = newLife - compCurLife
VARSET_TP bornSet(VarSetOps::Diff(this, newLife, compCurLife));
/* Can't simultaneously become live and dead at the same time */
// (deadSet UNION bornSet) != EMPTY
noway_assert(!VarSetOps::IsEmptyUnion(this, deadSet, bornSet));
// (deadSet INTERSECTION bornSet) == EMPTY
noway_assert(VarSetOps::IsEmptyIntersection(this, deadSet, bornSet));
VarSetOps::Assign(this, compCurLife, newLife);
// Handle the dying vars first, then the newly live vars.
// This is because, in the RyuJIT backend case, they may occupy registers that
// will be occupied by another var that is newly live.
VarSetOps::Iter deadIter(this, deadSet);
unsigned deadVarIndex = 0;
while (deadIter.NextElem(&deadVarIndex))
{
unsigned varNum = lvaTrackedIndexToLclNum(deadVarIndex);
LclVarDsc* varDsc = lvaGetDesc(varNum);
bool isGCRef = (varDsc->TypeGet() == TYP_REF);
bool isByRef = (varDsc->TypeGet() == TYP_BYREF);
bool isInReg = varDsc->lvIsInReg();
bool isInMemory = !isInReg || varDsc->IsAlwaysAliveInMemory();
if (isInReg)
{
// TODO-Cleanup: Move the code from compUpdateLifeVar to genUpdateRegLife that updates the
// gc sets
regMaskTP regMask = varDsc->lvRegMask();
if (isGCRef)
{
codeGen->gcInfo.gcRegGCrefSetCur &= ~regMask;
}
else if (isByRef)
{
codeGen->gcInfo.gcRegByrefSetCur &= ~regMask;
}
codeGen->genUpdateRegLife(varDsc, false /*isBorn*/, true /*isDying*/ DEBUGARG(nullptr));
}
// Update the gcVarPtrSetCur if it is in memory.
if (isInMemory && (isGCRef || isByRef))
{
VarSetOps::RemoveElemD(this, codeGen->gcInfo.gcVarPtrSetCur, deadVarIndex);
JITDUMP("\t\t\t\t\t\t\tV%02u becoming dead\n", varNum);
}
codeGen->getVariableLiveKeeper()->siEndVariableLiveRange(varNum);
}
VarSetOps::Iter bornIter(this, bornSet);
unsigned bornVarIndex = 0;
while (bornIter.NextElem(&bornVarIndex))
{
unsigned varNum = lvaTrackedIndexToLclNum(bornVarIndex);
LclVarDsc* varDsc = lvaGetDesc(varNum);
bool isGCRef = (varDsc->TypeGet() == TYP_REF);
bool isByRef = (varDsc->TypeGet() == TYP_BYREF);
if (varDsc->lvIsInReg())
{
// If this variable is going live in a register, it is no longer live on the stack,
// unless it is an EH/"spill at single-def" var, which always remains live on the stack.
if (!varDsc->IsAlwaysAliveInMemory())
{
#ifdef DEBUG
if (VarSetOps::IsMember(this, codeGen->gcInfo.gcVarPtrSetCur, bornVarIndex))
{
JITDUMP("\t\t\t\t\t\t\tRemoving V%02u from gcVarPtrSetCur\n", varNum);
}
#endif // DEBUG
VarSetOps::RemoveElemD(this, codeGen->gcInfo.gcVarPtrSetCur, bornVarIndex);
}
codeGen->genUpdateRegLife(varDsc, true /*isBorn*/, false /*isDying*/ DEBUGARG(nullptr));
regMaskTP regMask = varDsc->lvRegMask();
if (isGCRef)
{
codeGen->gcInfo.gcRegGCrefSetCur |= regMask;
}
else if (isByRef)
{
codeGen->gcInfo.gcRegByrefSetCur |= regMask;
}
}
else if (lvaIsGCTracked(varDsc))
{
// This isn't in a register, so update the gcVarPtrSetCur to show that it's live on the stack.
VarSetOps::AddElemD(this, codeGen->gcInfo.gcVarPtrSetCur, bornVarIndex);
JITDUMP("\t\t\t\t\t\t\tV%02u becoming live\n", varNum);
}
codeGen->getVariableLiveKeeper()->siStartVariableLiveRange(varDsc, varNum);
}
}
// Need an explicit instantiation.
template void Compiler::compChangeLife<true>(VARSET_VALARG_TP newLife);
/*****************************************************************************
*
* Generate a spill.
*/
void CodeGenInterface::spillReg(var_types type, TempDsc* tmp, regNumber reg)
{
GetEmitter()->emitIns_S_R(ins_Store(type), emitActualTypeSize(type), reg, tmp->tdTempNum(), 0);
}
/*****************************************************************************
*
* Generate a reload.
*/
void CodeGenInterface::reloadReg(var_types type, TempDsc* tmp, regNumber reg)
{
GetEmitter()->emitIns_R_S(ins_Load(type), emitActualTypeSize(type), reg, tmp->tdTempNum(), 0);
}
// inline
regNumber CodeGenInterface::genGetThisArgReg(GenTreeCall* call) const
{
return REG_ARG_0;
}
//----------------------------------------------------------------------
// getSpillTempDsc: get the TempDsc corresponding to a spilled tree.
//
// Arguments:
// tree - spilled GenTree node
//
// Return Value:
// TempDsc corresponding to tree
TempDsc* CodeGenInterface::getSpillTempDsc(GenTree* tree)
{
// tree must be in spilled state.
assert((tree->gtFlags & GTF_SPILLED) != 0);
// Get the tree's SpillDsc.
RegSet::SpillDsc* prevDsc;
RegSet::SpillDsc* spillDsc = regSet.rsGetSpillInfo(tree, tree->GetRegNum(), &prevDsc);
assert(spillDsc != nullptr);
// Get the temp desc.
TempDsc* temp = regSet.rsGetSpillTempWord(tree->GetRegNum(), spillDsc, prevDsc);
return temp;
}
/*****************************************************************************
*
* The following can be used to create basic blocks that serve as labels for
* the emitter. Use with caution - these are not real basic blocks!
*
*/
// inline
BasicBlock* CodeGen::genCreateTempLabel()
{
#ifdef DEBUG
// These blocks don't affect FP
compiler->fgSafeBasicBlockCreation = true;
#endif
// Label doesn't need a jump kind
BasicBlock* block = BasicBlock::New(compiler);
#ifdef DEBUG
compiler->fgSafeBasicBlockCreation = false;
#endif
JITDUMP("Mark " FMT_BB " as label: codegen temp block\n", block->bbNum);
block->SetFlags(BBF_HAS_LABEL);
// Use coldness of current block, as this label will
// be contained in it.
block->CopyFlags(compiler->compCurBB, BBF_COLD);
#ifdef DEBUG
#ifdef UNIX_X86_ABI
block->bbTgtStkDepth = (genStackLevel - curNestedAlignment) / sizeof(int);
#else
block->bbTgtStkDepth = genStackLevel / sizeof(int);
#endif
#endif
return block;
}
void CodeGen::genLogLabel(BasicBlock* bb)
{
#ifdef DEBUG
if (compiler->opts.dspCode)
{
printf("\n L_M%03u_" FMT_BB ":\n", compiler->compMethodID, bb->bbNum);
}
#endif
}
// genDefineTempLabel: Define a label based on the current GC info tracked by
// the code generator.
//
// Arguments:
// label - A label represented as a basic block. These are created with
// genCreateTempLabel and are not normal basic blocks.
//
// Notes:
// The label will be defined with the current GC info tracked by the code
// generator. When the emitter sees this label it will thus remove any temporary
// GC refs it is tracking in registers. For example, a call might produce a ref
// in RAX which the emitter would track but which would not be tracked in
// codegen's GC info since codegen would immediately copy it from RAX into its
// home.
//
void CodeGen::genDefineTempLabel(BasicBlock* label)
{
genLogLabel(label);
label->bbEmitCookie = GetEmitter()->emitAddLabel(gcInfo.gcVarPtrSetCur, gcInfo.gcRegGCrefSetCur,
gcInfo.gcRegByrefSetCur DEBUG_ARG(label));
}
// genDefineInlineTempLabel: Define an inline label that does not affect the GC
// info.
//
// Arguments:
// label - A label represented as a basic block. These are created with
// genCreateTempLabel and are not normal basic blocks.
//
// Notes:
// The emitter will continue to track GC info as if there was no label.
//
void CodeGen::genDefineInlineTempLabel(BasicBlock* label)
{
genLogLabel(label);
label->bbEmitCookie = GetEmitter()->emitAddInlineLabel();
}
//------------------------------------------------------------------------
// genAdjustStackLevel: Adjust the stack level, if required, for a throw helper block
//
// Arguments:
// block - The BasicBlock for which we are about to generate code.
//
// Assumptions:
// Must be called just prior to generating code for 'block'.
//
// Notes:
// This only makes an adjustment if !FEATURE_FIXED_OUT_ARGS, if there is no frame pointer,
// and if 'block' is a throw helper block with a non-zero stack level.
//
void CodeGen::genAdjustStackLevel(BasicBlock* block)
{
#if !FEATURE_FIXED_OUT_ARGS
// Check for inserted throw blocks and adjust genStackLevel.
#if defined(UNIX_X86_ABI)
if (isFramePointerUsed() && compiler->fgIsThrowHlpBlk(block))
{
// x86/Linux requires stack frames to be 16-byte aligned, but SP may be unaligned
// at this point if a jump to this block is made in the middle of pushing arguments.
//
// Here we restore SP to prevent potential stack alignment issues.
GetEmitter()->emitIns_R_AR(INS_lea, EA_PTRSIZE, REG_SPBASE, REG_FPBASE, -genSPtoFPdelta());
}
#endif
if (!isFramePointerUsed() && compiler->fgIsThrowHlpBlk(block))
{
noway_assert(block->HasFlag(BBF_HAS_LABEL));
SetStackLevel(compiler->fgThrowHlpBlkStkLevel(block) * sizeof(int));
if (genStackLevel != 0)
{
#ifdef TARGET_X86
GetEmitter()->emitMarkStackLvl(genStackLevel);
inst_RV_IV(INS_add, REG_SPBASE, genStackLevel, EA_PTRSIZE);
SetStackLevel(0);
#else // TARGET_X86
NYI("Need emitMarkStackLvl()");
#endif // TARGET_X86
}
}
#endif // !FEATURE_FIXED_OUT_ARGS
}
//------------------------------------------------------------------------
// genCreateAddrMode:
// Take an address expression and try to find the best set of components to
// form an address mode; returns true if this is successful.
//
// Parameters:
// addr - Tree that potentially computes an address
// fold - Secifies if it is OK to fold the array index which hangs off a GT_NOP node.
// naturalMul - For arm64 specifies the natural multiplier for the address mode (i.e. the size of the parent
// indirection).
// revPtr - [out] True if rv2 is before rv1 in the evaluation order
// rv1Ptr - [out] Base operand
// rv2Ptr - [out] Optional operand
// mulPtr - [out] Optional multiplier for rv2. If non-zero and naturalMul is non-zero, it must match naturalMul.
// cnsPtr - [out] Integer constant [optional]
//
// Returns:
// True if some address mode components were extracted.
//
bool CodeGen::genCreateAddrMode(GenTree* addr,
bool fold,
unsigned naturalMul,
bool* revPtr,
GenTree** rv1Ptr,
GenTree** rv2Ptr,
unsigned* mulPtr,
ssize_t* cnsPtr)
{
/*
The following indirections are valid address modes on x86/x64:
[ icon] * not handled here
[reg ]
[reg + icon]
[reg1 + reg2 ]
[reg1 + reg2 + icon]
[reg1 + 2 * reg2 ]
[reg1 + 4 * reg2 ]
[reg1 + 8 * reg2 ]