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helperexpansion.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.
#include "jitpch.h"
#include <minipal/utf8.h>
#ifdef _MSC_VER
#pragma hdrstop
#endif
// Obtain constant pointer from a tree
static void* GetConstantPointer(Compiler* comp, GenTree* tree)
{
void* cns = nullptr;
if (tree->gtEffectiveVal()->IsCnsIntOrI())
{
cns = (void*)tree->gtEffectiveVal()->AsIntCon()->IconValue();
}
else if (comp->vnStore->IsVNConstant(tree->gtVNPair.GetLiberal()))
{
cns = (void*)comp->vnStore->CoercedConstantValue<ssize_t>(tree->gtVNPair.GetLiberal());
}
return cns;
}
// Save expression to a local and append it as the last statement in exprBlock
static GenTree* SpillExpression(Compiler* comp, GenTree* expr, BasicBlock* exprBlock, DebugInfo& debugInfo)
{
unsigned const tmpNum = comp->lvaGrabTemp(true DEBUGARG("spilling expr"));
Statement* stmt = comp->fgNewStmtAtEnd(exprBlock, comp->gtNewTempStore(tmpNum, expr), debugInfo);
comp->gtSetStmtInfo(stmt);
comp->fgSetStmtSeq(stmt);
return comp->gtNewLclVarNode(tmpNum);
};
//------------------------------------------------------------------------------
// SplitAtTreeAndReplaceItWithLocal : Split block at the given tree and replace it with a local
// See comments in gtSplitTree and fgSplitBlockBeforeTree
// TODO: use this function in more places in this file.
//
// Arguments:
// comp - Compiler instance
// block - Block to split
// stmt - Statement containing the tree to split at
// tree - Tree to split at
// topBlock - [out] Top block after the split
// bottomBlock - [out] Bottom block after the split
//
// Return Value:
// Number of the local that replaces the tree
//
static unsigned SplitAtTreeAndReplaceItWithLocal(
Compiler* comp, BasicBlock* block, Statement* stmt, GenTree* tree, BasicBlock** topBlock, BasicBlock** bottomBlock)
{
BasicBlock* prevBb = block;
GenTree** callUse = nullptr;
Statement* newFirstStmt = nullptr;
block = comp->fgSplitBlockBeforeTree(block, stmt, tree, &newFirstStmt, &callUse);
assert(prevBb != nullptr && block != nullptr);
// Block ops inserted by the split need to be morphed here since we are after morph.
// We cannot morph stmt yet as we may modify it further below, and the morphing
// could invalidate callUse
while ((newFirstStmt != nullptr) && (newFirstStmt != stmt))
{
comp->fgMorphStmtBlockOps(block, newFirstStmt);
newFirstStmt = newFirstStmt->GetNextStmt();
}
// Grab a temp to store the result.
const unsigned tmpNum = comp->lvaGrabTemp(true DEBUGARG("replacement local"));
comp->lvaTable[tmpNum].lvType = tree->TypeGet();
// Replace the original call with that temp
*callUse = comp->gtNewLclvNode(tmpNum, tree->TypeGet());
comp->fgMorphStmtBlockOps(block, stmt);
comp->gtUpdateStmtSideEffects(stmt);
*topBlock = prevBb;
*bottomBlock = block;
return tmpNum;
}
//------------------------------------------------------------------------------
// gtNewRuntimeLookupHelperCallNode : Helper to create a runtime lookup call helper node.
//
// Arguments:
// helper - Call helper
// type - Type of the node
// args - Call args
//
// Return Value:
// New CT_HELPER node
//
GenTreeCall* Compiler::gtNewRuntimeLookupHelperCallNode(CORINFO_RUNTIME_LOOKUP* pRuntimeLookup,
GenTree* ctxTree,
void* compileTimeHandle)
{
// Call the helper
// - Setup argNode with the pointer to the signature returned by the lookup
GenTree* argNode = gtNewIconEmbHndNode(pRuntimeLookup->signature, nullptr, GTF_ICON_GLOBAL_PTR, compileTimeHandle);
GenTreeCall* helperCall = gtNewHelperCallNode(pRuntimeLookup->helper, TYP_I_IMPL, ctxTree, argNode);
// No need to perform CSE/hoisting for signature node - it is expected to end up in a rarely-taken block after
// "Expand runtime lookups" phase.
argNode->gtFlags |= GTF_DONT_CSE;
// Leave a note that this method has runtime lookups we might want to expand (nullchecks, size checks) later.
// We can also consider marking current block as a runtime lookup holder to improve TP for Tier0
impInlineRoot()->setMethodHasExpRuntimeLookup();
helperCall->SetExpRuntimeLookup();
if (!impInlineRoot()->GetSignatureToLookupInfoMap()->Lookup(pRuntimeLookup->signature))
{
JITDUMP("Registering %p in SignatureToLookupInfoMap\n", pRuntimeLookup->signature)
impInlineRoot()->GetSignatureToLookupInfoMap()->Set(pRuntimeLookup->signature, *pRuntimeLookup);
}
return helperCall;
}
//------------------------------------------------------------------------------
// fgExpandRuntimeLookups : partially expand runtime lookups helper calls
// to add a nullcheck [+ size check] and a fast path
// Returns:
// PhaseStatus indicating what, if anything, was changed.
//
// Notes:
// The runtime lookup itself is needed to access a handle in code shared between
// generic instantiations. The lookup depends on the typeContext which is only available at
// runtime, and not at compile - time. See ASCII block diagrams in comments below for
// better understanding how this phase expands runtime lookups.
//
PhaseStatus Compiler::fgExpandRuntimeLookups()
{
PhaseStatus result = PhaseStatus::MODIFIED_NOTHING;
if (!doesMethodHaveExpRuntimeLookup())
{
// The method being compiled doesn't have expandable runtime lookups. If it does
// and doesMethodHaveExpRuntimeLookup() still returns false we'll assert in LowerCall
return result;
}
return fgExpandHelper<&Compiler::fgExpandRuntimeLookupsForCall>(false);
}
//------------------------------------------------------------------------------
// fgExpandRuntimeLookupsForCall : partially expand runtime lookups helper calls
// to add a nullcheck [+ size check] and a fast path
//
// Arguments:
// pBlock - Block containing the helper call to expand. If expansion is performed,
// this is updated to the new block that was an outcome of block splitting.
// stmt - Statement containing the helper call
// call - The helper call
//
// Returns:
// true if a runtime lookup was found and expanded.
//
// Notes:
// The runtime lookup itself is needed to access a handle in code shared between
// generic instantiations. The lookup depends on the typeContext which is only available at
// runtime, and not at compile - time. See ASCII block diagrams in comments below for
// better understanding how this phase expands runtime lookups.
//
bool Compiler::fgExpandRuntimeLookupsForCall(BasicBlock** pBlock, Statement* stmt, GenTreeCall* call)
{
BasicBlock* block = *pBlock;
if (!call->IsHelperCall() || !call->IsExpRuntimeLookup())
{
return false;
}
// Clear ExpRuntimeLookup flag so we won't miss any runtime lookup that needs partial expansion
call->ClearExpRuntimeLookup();
if (call->IsTailCall())
{
// It is very unlikely to happen and is impossible to represent in C#
return false;
}
assert(call->gtArgs.CountArgs() == 2);
// The call has the following signature:
//
// type = call(genericCtx, signatureCns);
//
void* signature = GetConstantPointer(this, call->gtArgs.GetArgByIndex(1)->GetNode());
if (signature == nullptr)
{
// Technically, it is possible (e.g. it was CSE'd and then VN was erased), but for Debug mode we
// want to catch such cases as we really don't want to emit just a fallback call - it's too slow
assert(!"can't restore signature argument value");
return false;
}
JITDUMP("Expanding runtime lookup for [%06d] in " FMT_BB ":\n", dspTreeID(call), block->bbNum)
DISPTREE(call)
JITDUMP("\n")
// Restore runtimeLookup using signature argument via a global dictionary
CORINFO_RUNTIME_LOOKUP runtimeLookup = {};
const bool lookupFound = GetSignatureToLookupInfoMap()->Lookup(signature, &runtimeLookup);
assert(lookupFound);
const bool needsSizeCheck = runtimeLookup.sizeOffset != CORINFO_NO_SIZE_CHECK;
if (needsSizeCheck)
{
JITDUMP("dynamic expansion, needs size check.\n")
}
DebugInfo debugInfo = stmt->GetDebugInfo();
assert(runtimeLookup.indirections != 0);
assert(runtimeLookup.testForNull);
// Split block right before the call tree
BasicBlock* prevBb = block;
GenTree** callUse = nullptr;
Statement* newFirstStmt = nullptr;
block = fgSplitBlockBeforeTree(block, stmt, call, &newFirstStmt, &callUse);
*pBlock = block;
assert(prevBb != nullptr && block != nullptr);
// Block ops inserted by the split need to be morphed here since we are after morph.
// We cannot morph stmt yet as we may modify it further below, and the morphing
// could invalidate callUse.
while ((newFirstStmt != nullptr) && (newFirstStmt != stmt))
{
fgMorphStmtBlockOps(block, newFirstStmt);
newFirstStmt = newFirstStmt->GetNextStmt();
}
GenTreeLclVar* rtLookupLcl = nullptr;
// Mostly for Tier0: if the current statement is STORE_LCL_VAR(RuntimeLookup)
// we can drop it and use that LCL as the destination
if (stmt->GetRootNode()->OperIs(GT_STORE_LCL_VAR) && (stmt->GetRootNode()->AsLclVar()->Data() == *callUse))
{
rtLookupLcl = gtNewLclVarNode(stmt->GetRootNode()->AsLclVar()->GetLclNum());
fgRemoveStmt(block, stmt);
}
// Grab a temp to store result (it's assigned from either fastPathBb or fallbackBb)
if (rtLookupLcl == nullptr)
{
// Define a local for the result
unsigned rtLookupLclNum = lvaGrabTemp(true DEBUGARG("runtime lookup"));
lvaTable[rtLookupLclNum].lvType = TYP_I_IMPL;
rtLookupLcl = gtNewLclvNode(rtLookupLclNum, call->TypeGet());
*callUse = gtClone(rtLookupLcl);
fgMorphStmtBlockOps(block, stmt);
gtUpdateStmtSideEffects(stmt);
}
GenTree* ctxTree = call->gtArgs.GetArgByIndex(0)->GetNode();
GenTree* sigNode = call->gtArgs.GetArgByIndex(1)->GetNode();
// Prepare slotPtr tree (TODO: consider sharing this part with impRuntimeLookup)
GenTree* slotPtrTree = gtCloneExpr(ctxTree);
GenTree* indOffTree = nullptr;
GenTree* lastIndOfTree = nullptr;
for (WORD i = 0; i < runtimeLookup.indirections; i++)
{
if ((i == 1 && runtimeLookup.indirectFirstOffset) || (i == 2 && runtimeLookup.indirectSecondOffset))
{
indOffTree = SpillExpression(this, slotPtrTree, prevBb, debugInfo);
slotPtrTree = gtCloneExpr(indOffTree);
}
// The last indirection could be subject to a size check (dynamic dictionary expansion)
const bool isLastIndirectionWithSizeCheck = (i == runtimeLookup.indirections - 1) && needsSizeCheck;
if (i != 0)
{
GenTreeFlags indirFlags = GTF_IND_NONFAULTING;
if (!isLastIndirectionWithSizeCheck)
{
indirFlags |= GTF_IND_INVARIANT;
}
slotPtrTree = gtNewIndir(TYP_I_IMPL, slotPtrTree, indirFlags);
}
if ((i == 1 && runtimeLookup.indirectFirstOffset) || (i == 2 && runtimeLookup.indirectSecondOffset))
{
slotPtrTree = gtNewOperNode(GT_ADD, TYP_I_IMPL, indOffTree, slotPtrTree);
}
if (runtimeLookup.offsets[i] != 0)
{
if (isLastIndirectionWithSizeCheck)
{
lastIndOfTree = SpillExpression(this, slotPtrTree, prevBb, debugInfo);
slotPtrTree = gtCloneExpr(lastIndOfTree);
}
slotPtrTree =
gtNewOperNode(GT_ADD, TYP_I_IMPL, slotPtrTree, gtNewIconNode(runtimeLookup.offsets[i], TYP_I_IMPL));
}
}
// Non-dynamic expansion case (no size check):
//
// prevBb(BBJ_ALWAYS): [weight: 1.0]
// ...
//
// nullcheckBb(BBJ_COND): [weight: 1.0]
// if (*fastPathValue == null)
// goto fallbackBb;
//
// fastPathBb(BBJ_ALWAYS): [weight: 0.8]
// rtLookupLcl = *fastPathValue;
// goto block;
//
// fallbackBb(BBJ_ALWAYS): [weight: 0.2]
// rtLookupLcl = HelperCall();
//
// block(...): [weight: 1.0]
// use(rtLookupLcl);
//
// null-check basic block
GenTree* fastPathValue = gtNewIndir(TYP_I_IMPL, gtCloneExpr(slotPtrTree), GTF_IND_NONFAULTING);
// Save dictionary slot to a local (to be used by fast path)
GenTree* fastPathValueClone =
opts.OptimizationEnabled() ? fgMakeMultiUse(&fastPathValue) : gtCloneExpr(fastPathValue);
GenTree* nullcheckOp = gtNewOperNode(GT_EQ, TYP_INT, fastPathValue, gtNewIconNode(0, TYP_I_IMPL));
nullcheckOp->gtFlags |= GTF_RELOP_JMP_USED;
// nullcheckBb conditionally jumps to fallbackBb, but we need to initialize fallbackBb last
// so we can place it after nullcheckBb. So set the jump target later.
BasicBlock* nullcheckBb =
fgNewBBFromTreeAfter(BBJ_COND, prevBb, gtNewOperNode(GT_JTRUE, TYP_VOID, nullcheckOp), debugInfo);
// Fallback basic block
GenTree* fallbackValueDef = gtNewStoreLclVarNode(rtLookupLcl->GetLclNum(), call);
BasicBlock* fallbackBb =
fgNewBBFromTreeAfter(BBJ_ALWAYS, nullcheckBb, fallbackValueDef, debugInfo, nullcheckBb->Next(), true);
assert(fallbackBb->JumpsToNext());
fallbackBb->SetFlags(BBF_NONE_QUIRK);
// Set nullcheckBb's true jump target
nullcheckBb->SetTrueTarget(fallbackBb);
// Fast-path basic block
GenTree* fastpathValueDef = gtNewStoreLclVarNode(rtLookupLcl->GetLclNum(), fastPathValueClone);
BasicBlock* fastPathBb = fgNewBBFromTreeAfter(BBJ_ALWAYS, nullcheckBb, fastpathValueDef, debugInfo, block);
// Set nullcheckBb's false jump target
nullcheckBb->SetFalseTarget(fastPathBb);
BasicBlock* sizeCheckBb = nullptr;
if (needsSizeCheck)
{
// Dynamic expansion case (sizeCheckBb is added and some preds are changed):
//
// prevBb(BBJ_ALWAYS): [weight: 1.0]
//
// sizeCheckBb(BBJ_COND): [weight: 1.0]
// if (sizeValue <= offsetValue)
// goto fallbackBb;
// ...
//
// nullcheckBb(BBJ_COND): [weight: 0.8]
// if (*fastPathValue == null)
// goto fallbackBb;
//
// fastPathBb(BBJ_ALWAYS): [weight: 0.64]
// rtLookupLcl = *fastPathValue;
// goto block;
//
// fallbackBb(BBJ_ALWAYS): [weight: 0.36]
// rtLookupLcl = HelperCall();
//
// block(...): [weight: 1.0]
// use(rtLookupLcl);
//
// sizeValue = dictionary[pRuntimeLookup->sizeOffset]
GenTreeIntCon* sizeOffset = gtNewIconNode(runtimeLookup.sizeOffset, TYP_I_IMPL);
assert(lastIndOfTree != nullptr);
GenTree* sizeValueOffset = gtNewOperNode(GT_ADD, TYP_I_IMPL, lastIndOfTree, sizeOffset);
GenTree* sizeValue = gtNewIndir(TYP_I_IMPL, sizeValueOffset, GTF_IND_NONFAULTING);
// sizeCheck fails if sizeValue <= pRuntimeLookup->offsets[i]
GenTree* offsetValue = gtNewIconNode(runtimeLookup.offsets[runtimeLookup.indirections - 1], TYP_I_IMPL);
GenTree* sizeCheck = gtNewOperNode(GT_LE, TYP_INT, sizeValue, offsetValue);
sizeCheck->gtFlags |= GTF_RELOP_JMP_USED;
GenTree* jtrue = gtNewOperNode(GT_JTRUE, TYP_VOID, sizeCheck);
// sizeCheckBb fails - jump to fallbackBb
sizeCheckBb = fgNewBBFromTreeAfter(BBJ_COND, prevBb, jtrue, debugInfo, fallbackBb);
sizeCheckBb->SetFalseTarget(nullcheckBb);
}
//
// Update preds in all new blocks
//
fgRemoveRefPred(block, prevBb);
fgAddRefPred(block, fastPathBb);
fgAddRefPred(block, fallbackBb);
assert(prevBb->KindIs(BBJ_ALWAYS));
if (needsSizeCheck)
{
// sizeCheckBb is the first block after prevBb
prevBb->SetTarget(sizeCheckBb);
fgAddRefPred(sizeCheckBb, prevBb);
// sizeCheckBb flows into nullcheckBb in case if the size check passes
fgAddRefPred(nullcheckBb, sizeCheckBb);
// fallbackBb is reachable from both nullcheckBb and sizeCheckBb
fgAddRefPred(fallbackBb, nullcheckBb);
fgAddRefPred(fallbackBb, sizeCheckBb);
// fastPathBb is only reachable from successful nullcheckBb
fgAddRefPred(fastPathBb, nullcheckBb);
}
else
{
// nullcheckBb is the first block after prevBb
prevBb->SetTarget(nullcheckBb);
fgAddRefPred(nullcheckBb, prevBb);
// No size check, nullcheckBb jumps to fast path
fgAddRefPred(fastPathBb, nullcheckBb);
// fallbackBb is only reachable from nullcheckBb (jump destination)
fgAddRefPred(fallbackBb, nullcheckBb);
}
//
// Re-distribute weights (see '[weight: X]' on the diagrams above)
// TODO: consider marking fallbackBb as rarely-taken
//
block->inheritWeight(prevBb);
if (needsSizeCheck)
{
sizeCheckBb->inheritWeight(prevBb);
// 80% chance we pass nullcheck
nullcheckBb->inheritWeightPercentage(sizeCheckBb, 80);
// 64% (0.8 * 0.8) chance we pass both nullcheck and sizecheck
fastPathBb->inheritWeightPercentage(nullcheckBb, 80);
// 100-64=36% chance we fail either nullcheck or sizecheck
fallbackBb->inheritWeightPercentage(sizeCheckBb, 36);
}
else
{
nullcheckBb->inheritWeight(prevBb);
// 80% chance we pass nullcheck
fastPathBb->inheritWeightPercentage(nullcheckBb, 80);
// 20% chance we fail nullcheck (TODO: Consider making it cold (0%))
fallbackBb->inheritWeightPercentage(nullcheckBb, 20);
}
// All blocks are expected to be in the same EH region
assert(BasicBlock::sameEHRegion(prevBb, block));
assert(BasicBlock::sameEHRegion(prevBb, nullcheckBb));
assert(BasicBlock::sameEHRegion(prevBb, fastPathBb));
if (needsSizeCheck)
{
assert(BasicBlock::sameEHRegion(prevBb, sizeCheckBb));
}
return true;
}
//------------------------------------------------------------------------------
// fgExpandThreadLocalAccess: Inline the CORINFO_HELP_GETSHARED_NONGCTHREADSTATIC_BASE_NOCTOR_OPTIMIZED
// or CORINFO_HELP_GETSHARED_GCTHREADSTATIC_BASE_NOCTOR_OPTIMIZED helper. See
// fgExpandThreadLocalAccessForCall for details.
//
// Returns:
// PhaseStatus indicating what, if anything, was changed.
//
PhaseStatus Compiler::fgExpandThreadLocalAccess()
{
PhaseStatus result = PhaseStatus::MODIFIED_NOTHING;
if (!methodHasTlsFieldAccess())
{
// TP: nothing to expand in the current method
JITDUMP("Nothing to expand.\n")
return result;
}
// Always expand for NativeAOT because the slow TLS access helper will not be generated by NativeAOT
const bool isNativeAOT = IsTargetAbi(CORINFO_NATIVEAOT_ABI);
if (isNativeAOT)
{
return fgExpandHelper<&Compiler::fgExpandThreadLocalAccessForCallNativeAOT>(
false /* expand rarely run blocks for NativeAOT */);
}
if (opts.OptimizationDisabled())
{
JITDUMP("Optimizations aren't allowed - bail out.\n")
return result;
}
// TODO: Replace with opts.compCodeOpt once it's fixed
const bool preferSize = opts.jitFlags->IsSet(JitFlags::JIT_FLAG_SIZE_OPT);
if (preferSize)
{
// The optimization comes with a codegen size increase
JITDUMP("Optimized for size - bail out.\n")
return result;
}
return fgExpandHelper<&Compiler::fgExpandThreadLocalAccessForCall>(true);
}
//------------------------------------------------------------------------------
// fgExpandThreadLocalAccessForCallNativeAOT : Expand the access of tlsRoot needed
// to access fields marked with [ThreadLocal].
//
// Arguments:
// pBlock - Block containing the helper call to expand. If expansion is performed,
// this is updated to the new block that was an outcome of block splitting.
// stmt - Statement containing the helper call
// call - The helper call
//
//
// Returns:
// true if we expanded any field access, false otherwise.
//
bool Compiler::fgExpandThreadLocalAccessForCallNativeAOT(BasicBlock** pBlock, Statement* stmt, GenTreeCall* call)
{
assert(IsTargetAbi(CORINFO_NATIVEAOT_ABI));
BasicBlock* block = *pBlock;
CorInfoHelpFunc helper = call->GetHelperNum();
const bool isExpTLSFieldAccess = (helper == CORINFO_HELP_READYTORUN_THREADSTATIC_BASE_NOCTOR);
if (!call->IsHelperCall() || !isExpTLSFieldAccess)
{
return false;
}
JITDUMP("Expanding thread static local access for [%06d] in " FMT_BB ":\n", dspTreeID(call), block->bbNum);
DISPTREE(call);
JITDUMP("\n");
CORINFO_THREAD_STATIC_INFO_NATIVEAOT threadStaticInfo;
memset(&threadStaticInfo, 0, sizeof(CORINFO_THREAD_STATIC_INFO_NATIVEAOT));
info.compCompHnd->getThreadLocalStaticInfo_NativeAOT(&threadStaticInfo);
JITDUMP("tlsRootObject= %p\n", dspPtr(threadStaticInfo.tlsRootObject.addr));
JITDUMP("tlsIndexObject= %p\n", dspPtr(threadStaticInfo.tlsIndexObject.addr));
JITDUMP("offsetOfThreadLocalStoragePointer= %u\n", dspOffset(threadStaticInfo.offsetOfThreadLocalStoragePointer));
JITDUMP("threadStaticBaseSlow= %p\n", dspPtr(threadStaticInfo.threadStaticBaseSlow.addr));
// Split block right before the call tree
BasicBlock* prevBb = block;
GenTree** callUse = nullptr;
Statement* newFirstStmt = nullptr;
DebugInfo debugInfo = stmt->GetDebugInfo();
block = fgSplitBlockBeforeTree(block, stmt, call, &newFirstStmt, &callUse);
*pBlock = block;
var_types callType = call->TypeGet();
assert(prevBb != nullptr && block != nullptr);
unsigned finalLclNum = lvaGrabTemp(true DEBUGARG("Final offset"));
// Note, `tlsRoot` refers to the TLS blob object, which is an unpinned managed object,
// thus the type of the local is TYP_REF
lvaTable[finalLclNum].lvType = TYP_REF;
GenTree* finalLcl = gtNewLclVarNode(finalLclNum);
// Block ops inserted by the split need to be morphed here since we are after morph.
// We cannot morph stmt yet as we may modify it further below, and the morphing
// could invalidate callUse.
while ((newFirstStmt != nullptr) && (newFirstStmt != stmt))
{
fgMorphStmtBlockOps(block, newFirstStmt);
newFirstStmt = newFirstStmt->GetNextStmt();
}
#ifdef TARGET_64BIT
// prevBb (BBJ_NONE): [weight: 1.0]
// ...
//
// tlsRootNullCondBB (BBJ_COND): [weight: 1.0]
// fastPathValue = [tlsRootAddress]
// if (fastPathValue != nullptr)
// goto fastPathBb;
//
// fallbackBb (BBJ_ALWAYS): [weight: 0]
// tlsRoot = HelperCall();
// goto block;
//
// fastPathBb(BBJ_ALWAYS): [weight: 1.0]
// tlsRoot = fastPathValue;
//
// block (...): [weight: 1.0]
// use(tlsRoot);
// ...
GenTree* tlsRootAddr = nullptr;
CORINFO_CONST_LOOKUP tlsRootObject = threadStaticInfo.tlsRootObject;
if (TargetOS::IsWindows)
{
// Mark this ICON as a TLS_HDL, codegen will use FS:[cns] or GS:[cns]
GenTree* tlsValue = gtNewIconHandleNode(threadStaticInfo.offsetOfThreadLocalStoragePointer, GTF_ICON_TLS_HDL);
tlsValue = gtNewIndir(TYP_I_IMPL, tlsValue, GTF_IND_NONFAULTING | GTF_IND_INVARIANT);
CORINFO_CONST_LOOKUP tlsIndexObject = threadStaticInfo.tlsIndexObject;
GenTree* dllRef = gtNewIconHandleNode((size_t)tlsIndexObject.handle, GTF_ICON_OBJ_HDL);
dllRef = gtNewIndir(TYP_INT, dllRef, GTF_IND_NONFAULTING | GTF_IND_INVARIANT);
dllRef = gtNewOperNode(GT_MUL, TYP_I_IMPL, dllRef, gtNewIconNode(TARGET_POINTER_SIZE, TYP_INT));
// Add the dllRef to produce thread local storage reference for coreclr
tlsValue = gtNewOperNode(GT_ADD, TYP_I_IMPL, tlsValue, dllRef);
// Base of coreclr's thread local storage
tlsValue = gtNewIndir(TYP_I_IMPL, tlsValue, GTF_IND_NONFAULTING | GTF_IND_INVARIANT);
// This resolves to an offset which is TYP_INT
GenTree* tlsRootOffset = gtNewIconNode((size_t)tlsRootObject.handle, TYP_INT);
tlsRootOffset->gtFlags |= GTF_ICON_SECREL_OFFSET;
// Add the tlsValue and tlsRootOffset to produce tlsRootAddr.
tlsRootAddr = gtNewOperNode(GT_ADD, TYP_I_IMPL, tlsValue, tlsRootOffset);
}
else if (TargetOS::IsUnix)
{
// Code sequence to access thread local variable on linux/x64:
// data16
// lea rdi, 0x7FE5C418CD28 ; tlsRootObject
// data16 data16
// call _tls_get_addr
//
// This sequence along with `data16` prefix is expected by the linker so it
// will patch these with TLS access.
GenTree* tls_get_addr_val =
gtNewIconHandleNode((size_t)threadStaticInfo.tlsGetAddrFtnPtr.handle, GTF_ICON_FTN_ADDR);
tls_get_addr_val->SetContained();
// GenTreeCall* tlsRefCall = gtNewCallNode(CT_ tls_get_addr_val, TYP_I_IMPL);
GenTreeCall* tlsRefCall = gtNewIndCallNode(tls_get_addr_val, TYP_I_IMPL);
tlsRefCall->gtFlags |= GTF_TLS_GET_ADDR;
// //
// This is an indirect call which takes an argument.
// Populate and set the ABI appropriately.
assert(tlsRootObject.handle != 0);
GenTree* tlsArg = gtNewIconNode((size_t)tlsRootObject.handle, TYP_I_IMPL);
tlsArg->gtFlags |= GTF_ICON_TLSGD_OFFSET;
tlsRefCall->gtArgs.PushBack(this, NewCallArg::Primitive(tlsArg));
fgMorphArgs(tlsRefCall);
tlsRefCall->gtFlags |= GTF_EXCEPT | (tls_get_addr_val->gtFlags & GTF_GLOB_EFFECT);
tlsRootAddr = tlsRefCall;
}
else
{
unreached();
}
// Cache the TlsRootAddr value
unsigned tlsRootAddrLclNum = lvaGrabTemp(true DEBUGARG("TlsRootAddr access"));
lvaTable[tlsRootAddrLclNum].lvType = TYP_I_IMPL;
GenTree* tlsRootAddrDef = gtNewStoreLclVarNode(tlsRootAddrLclNum, tlsRootAddr);
GenTree* tlsRootAddrUse = gtNewLclVarNode(tlsRootAddrLclNum);
// See comments near finalLclNum above regarding TYP_REF
GenTree* tlsRootVal = gtNewIndir(TYP_REF, tlsRootAddrUse, GTF_IND_NONFAULTING | GTF_IND_INVARIANT);
GenTree* tlsRootDef = gtNewStoreLclVarNode(finalLclNum, tlsRootVal);
GenTree* tlsRootNullCond = gtNewOperNode(GT_NE, TYP_INT, gtCloneExpr(finalLcl), gtNewIconNode(0, TYP_I_IMPL));
tlsRootNullCond = gtNewOperNode(GT_JTRUE, TYP_VOID, tlsRootNullCond);
// tlsRootNullCondBB
BasicBlock* tlsRootNullCondBB = fgNewBBFromTreeAfter(BBJ_COND, prevBb, tlsRootAddrDef, debugInfo);
fgInsertStmtAfter(tlsRootNullCondBB, tlsRootNullCondBB->firstStmt(), fgNewStmtFromTree(tlsRootNullCond));
fgInsertStmtAfter(tlsRootNullCondBB, tlsRootNullCondBB->firstStmt(), fgNewStmtFromTree(tlsRootDef));
CORINFO_CONST_LOOKUP threadStaticSlowHelper = threadStaticInfo.threadStaticBaseSlow;
// See comments near finalLclNum above regarding TYP_REF
GenTreeCall* slowHelper =
gtNewIndCallNode(gtNewIconHandleNode((size_t)threadStaticSlowHelper.addr, GTF_ICON_TLS_HDL), TYP_REF);
GenTree* helperArg = gtClone(tlsRootAddrUse);
slowHelper->gtArgs.PushBack(this, NewCallArg::Primitive(helperArg));
fgMorphArgs(slowHelper);
// fallbackBb
GenTree* fallbackValueDef = gtNewStoreLclVarNode(finalLclNum, slowHelper);
BasicBlock* fallbackBb =
fgNewBBFromTreeAfter(BBJ_ALWAYS, tlsRootNullCondBB, fallbackValueDef, debugInfo, block, true);
GenTree* fastPathValueDef = gtNewStoreLclVarNode(finalLclNum, gtCloneExpr(finalLcl));
BasicBlock* fastPathBb = fgNewBBFromTreeAfter(BBJ_ALWAYS, fallbackBb, fastPathValueDef, debugInfo, block, true);
*callUse = finalLcl;
fgMorphStmtBlockOps(block, stmt);
gtUpdateStmtSideEffects(stmt);
//
// Update preds in all new blocks
//
fgAddRefPred(fallbackBb, tlsRootNullCondBB);
fgAddRefPred(fastPathBb, tlsRootNullCondBB);
fgAddRefPred(block, fallbackBb);
fgAddRefPred(block, fastPathBb);
tlsRootNullCondBB->SetTrueTarget(fastPathBb);
tlsRootNullCondBB->SetFalseTarget(fallbackBb);
// Inherit the weights
block->inheritWeight(prevBb);
tlsRootNullCondBB->inheritWeight(prevBb);
fastPathBb->inheritWeight(prevBb);
// fallback will just execute first time
fallbackBb->bbSetRunRarely();
fgRemoveRefPred(block, prevBb);
fgAddRefPred(tlsRootNullCondBB, prevBb);
prevBb->SetTarget(tlsRootNullCondBB);
// All blocks are expected to be in the same EH region
assert(BasicBlock::sameEHRegion(prevBb, block));
assert(BasicBlock::sameEHRegion(prevBb, tlsRootNullCondBB));
assert(BasicBlock::sameEHRegion(prevBb, fastPathBb));
JITDUMP("tlsRootNullCondBB: " FMT_BB "\n", tlsRootNullCondBB->bbNum);
JITDUMP("fallbackBb: " FMT_BB "\n", fallbackBb->bbNum);
JITDUMP("fastPathBb: " FMT_BB "\n", fastPathBb->bbNum);
#else
unreached();
#endif // TARGET_64BIT
return true;
}
//------------------------------------------------------------------------------
// fgExpandThreadLocalAccessForCall : Expand the CORINFO_HELP_GETSHARED_NONGCTHREADSTATIC_BASE_NOCTOR_OPTIMIZED
// or CORINFO_HELP_GETSHARED_GCTHREADSTATIC_BASE_NOCTOR_OPTIMIZED, that access fields marked with [ThreadLocal].
//
// Arguments:
// pBlock - Block containing the helper call to expand. If expansion is performed,
// this is updated to the new block that was an outcome of block splitting.
// stmt - Statement containing the helper call
// call - The helper call
//
//
// Returns:
// true if we expanded any field access, false otherwise.
//
// Notes:
// A cache is stored in thread local storage (TLS) of coreclr. It maps the typeIndex (embedded in
// the code at the JIT time) to the base of static blocks. This method generates code to
// extract the TLS, get the entry at which the cache is stored. Then it checks if the typeIndex of
// enclosing type of current field is present in the cache and if yes, extract out that can be directly
// accessed at the uses.
// If the entry is not present, the helper is called, which would make an entry of current static block
// in the cache.
//
bool Compiler::fgExpandThreadLocalAccessForCall(BasicBlock** pBlock, Statement* stmt, GenTreeCall* call)
{
assert(!opts.IsReadyToRun());
BasicBlock* block = *pBlock;
CorInfoHelpFunc helper = call->GetHelperNum();
if ((helper != CORINFO_HELP_GETSHARED_NONGCTHREADSTATIC_BASE_NOCTOR_OPTIMIZED) &&
(helper != CORINFO_HELP_GETSHARED_GCTHREADSTATIC_BASE_NOCTOR_OPTIMIZED))
{
return false;
}
if (TargetOS::IsUnix)
{
#if defined(TARGET_ARM) || !defined(TARGET_64BIT)
// On Arm, Thread execution blocks are accessed using co-processor registers and instructions such
// as MRC and MCR are used to access them. We do not support them and so should never optimize the
// field access using TLS.
noway_assert(!"Unsupported scenario of optimizing TLS access on Linux Arm32/x86");
#endif
}
else
{
#ifdef TARGET_ARM
// On Arm, Thread execution blocks are accessed using co-processor registers and instructions such
// as MRC and MCR are used to access them. We do not support them and so should never optimize the
// field access using TLS.
noway_assert(!"Unsupported scenario of optimizing TLS access on Windows Arm32");
#endif
}
JITDUMP("Expanding thread static local access for [%06d] in " FMT_BB ":\n", dspTreeID(call), block->bbNum);
DISPTREE(call);
JITDUMP("\n");
bool isGCThreadStatic =
eeGetHelperNum(call->gtCallMethHnd) == CORINFO_HELP_GETSHARED_GCTHREADSTATIC_BASE_NOCTOR_OPTIMIZED;
CORINFO_THREAD_STATIC_BLOCKS_INFO threadStaticBlocksInfo;
memset(&threadStaticBlocksInfo, 0, sizeof(CORINFO_THREAD_STATIC_BLOCKS_INFO));
info.compCompHnd->getThreadLocalStaticBlocksInfo(&threadStaticBlocksInfo, isGCThreadStatic);
JITDUMP("getThreadLocalStaticBlocksInfo (%s)\n:", isGCThreadStatic ? "GC" : "Non-GC");
JITDUMP("tlsIndex= %p\n", dspPtr(threadStaticBlocksInfo.tlsIndex.addr));
JITDUMP("tlsGetAddrFtnPtr= %p\n", dspPtr(threadStaticBlocksInfo.tlsGetAddrFtnPtr));
JITDUMP("tlsIndexObject= %p\n", dspPtr(threadStaticBlocksInfo.tlsIndexObject));
JITDUMP("threadVarsSection= %p\n", dspPtr(threadStaticBlocksInfo.threadVarsSection));
JITDUMP("offsetOfThreadLocalStoragePointer= %u\n",
dspOffset(threadStaticBlocksInfo.offsetOfThreadLocalStoragePointer));
JITDUMP("offsetOfMaxThreadStaticBlocks= %u\n", dspOffset(threadStaticBlocksInfo.offsetOfMaxThreadStaticBlocks));
JITDUMP("offsetOfThreadStaticBlocks= %u\n", dspOffset(threadStaticBlocksInfo.offsetOfThreadStaticBlocks));
JITDUMP("offsetOfGCDataPointer= %u\n", dspOffset(threadStaticBlocksInfo.offsetOfGCDataPointer));
assert(call->gtArgs.CountArgs() == 1);
// Split block right before the call tree
BasicBlock* prevBb = block;
GenTree** callUse = nullptr;
Statement* newFirstStmt = nullptr;
DebugInfo debugInfo = stmt->GetDebugInfo();
block = fgSplitBlockBeforeTree(block, stmt, call, &newFirstStmt, &callUse);
*pBlock = block;
var_types callType = call->TypeGet();
assert(prevBb != nullptr && block != nullptr);
// Block ops inserted by the split need to be morphed here since we are after morph.
// We cannot morph stmt yet as we may modify it further below, and the morphing
// could invalidate callUse.
while ((newFirstStmt != nullptr) && (newFirstStmt != stmt))
{
fgMorphStmtBlockOps(block, newFirstStmt);
newFirstStmt = newFirstStmt->GetNextStmt();
}
GenTreeLclVar* threadStaticBlockLcl = nullptr;
// Grab a temp to store result (it's assigned from either fastPathBb or fallbackBb)
unsigned threadStaticBlockLclNum = lvaGrabTemp(true DEBUGARG("TLS field access"));
lvaTable[threadStaticBlockLclNum].lvType = callType;
threadStaticBlockLcl = gtNewLclvNode(threadStaticBlockLclNum, callType);
*callUse = gtClone(threadStaticBlockLcl);
fgMorphStmtBlockOps(block, stmt);
gtUpdateStmtSideEffects(stmt);
GenTree* tlsValue = nullptr;
unsigned tlsLclNum = lvaGrabTemp(true DEBUGARG("TLS access"));
lvaTable[tlsLclNum].lvType = TYP_I_IMPL;
GenTree* maxThreadStaticBlocksValue = nullptr;
GenTree* threadStaticBlocksValue = nullptr;
GenTree* tlsValueDef = nullptr;
if (TargetOS::IsWindows)
{
size_t tlsIndexValue = (size_t)threadStaticBlocksInfo.tlsIndex.addr;
GenTree* dllRef = nullptr;
if (tlsIndexValue != 0)
{
dllRef = gtNewIconHandleNode(tlsIndexValue * TARGET_POINTER_SIZE, GTF_ICON_TLS_HDL);
}
// Mark this ICON as a TLS_HDL, codegen will use FS:[cns] or GS:[cns]
tlsValue = gtNewIconHandleNode(threadStaticBlocksInfo.offsetOfThreadLocalStoragePointer, GTF_ICON_TLS_HDL);
tlsValue = gtNewIndir(TYP_I_IMPL, tlsValue, GTF_IND_NONFAULTING | GTF_IND_INVARIANT);
if (dllRef != nullptr)
{
// Add the dllRef to produce thread local storage reference for coreclr
tlsValue = gtNewOperNode(GT_ADD, TYP_I_IMPL, tlsValue, dllRef);
}
// Base of coreclr's thread local storage
tlsValue = gtNewIndir(TYP_I_IMPL, tlsValue, GTF_IND_NONFAULTING | GTF_IND_INVARIANT);
}
else if (TargetOS::IsApplePlatform)
{
// For Apple x64/arm64, we need to get the address of relevant __thread_vars section of
// the thread local variable `t_ThreadStatics`. Address of `tlv_get_address` is stored
// in this entry, which we dereference and invoke it, passing the __thread_vars address
// present in `threadVarsSection`.
//
// Code sequence to access thread local variable on Apple/x64:
//
// mov rdi, threadVarsSection
// call [rdi]
//
// Code sequence to access thread local variable on Apple/arm64:
//
// mov x0, threadVarsSection
// mov x1, [x0]
// blr x1
//
size_t threadVarsSectionVal = (size_t)threadStaticBlocksInfo.threadVarsSection;
GenTree* tls_get_addr_val = gtNewIconHandleNode(threadVarsSectionVal, GTF_ICON_FTN_ADDR);
tls_get_addr_val = gtNewIndir(TYP_I_IMPL, tls_get_addr_val, GTF_IND_NONFAULTING | GTF_IND_INVARIANT);
tlsValue = gtNewIndCallNode(tls_get_addr_val, TYP_I_IMPL);
GenTreeCall* tlsRefCall = tlsValue->AsCall();
// This is a call which takes an argument.
// Populate and set the ABI appropriately.
assert(opts.altJit || threadVarsSectionVal != 0);
GenTree* tlsArg = gtNewIconNode(threadVarsSectionVal, TYP_I_IMPL);
tlsRefCall->gtArgs.PushBack(this, NewCallArg::Primitive(tlsArg));
fgMorphArgs(tlsRefCall);
tlsRefCall->gtFlags |= GTF_EXCEPT | (tls_get_addr_val->gtFlags & GTF_GLOB_EFFECT);
}
else if (TargetOS::IsUnix)
{
#if defined(TARGET_AMD64)
// Code sequence to access thread local variable on linux/x64:
//
// mov rdi, 0x7FE5C418CD28 ; tlsIndexObject
// mov rax, 0x7FE5C47AFDB0 ; _tls_get_addr
// call rax
//
GenTree* tls_get_addr_val =
gtNewIconHandleNode((size_t)threadStaticBlocksInfo.tlsGetAddrFtnPtr, GTF_ICON_FTN_ADDR);
tlsValue = gtNewIndCallNode(tls_get_addr_val, TYP_I_IMPL);
GenTreeCall* tlsRefCall = tlsValue->AsCall();
// This is an indirect call which takes an argument.
// Populate and set the ABI appropriately.
assert(opts.altJit || threadStaticBlocksInfo.tlsIndexObject != 0);
GenTree* tlsArg = gtNewIconNode((size_t)threadStaticBlocksInfo.tlsIndexObject, TYP_I_IMPL);
tlsRefCall->gtArgs.PushBack(this, NewCallArg::Primitive(tlsArg));
fgMorphArgs(tlsRefCall);
tlsRefCall->gtFlags |= GTF_EXCEPT | (tls_get_addr_val->gtFlags & GTF_GLOB_EFFECT);
#ifdef UNIX_X86_ABI
tlsRefCall->gtFlags &= ~GTF_CALL_POP_ARGS;
#endif // UNIX_X86_ABI
#elif defined(TARGET_ARM64) || defined(TARGET_LOONGARCH64) || defined(TARGET_RISCV64)
// Code sequence to access thread local variable on linux/arm64:
//
// mrs xt, tpidr_elf0
// mov xd, [xt+cns]
//
// Code sequence to access thread local variable on linux/loongarch64:
//
// ori, targetReg, $tp, 0
// load rd, targetReg, cns
//
// Code sequence to access thread local variable on linux/riscv64:
//
// mov targetReg, $tp
// ld rd, targetReg(cns)
tlsValue = gtNewIconHandleNode(0, GTF_ICON_TLS_HDL);
#else
assert(!"Unsupported scenario of optimizing TLS access on Linux Arm32/x86");
#endif
}
// Cache the tls value
tlsValueDef = gtNewStoreLclVarNode(tlsLclNum, tlsValue);
GenTree* tlsLclValueUse = gtNewLclVarNode(tlsLclNum);
size_t offsetOfThreadStaticBlocksVal = threadStaticBlocksInfo.offsetOfThreadStaticBlocks;
size_t offsetOfMaxThreadStaticBlocksVal = threadStaticBlocksInfo.offsetOfMaxThreadStaticBlocks;
// Create tree for "maxThreadStaticBlocks = tls[offsetOfMaxThreadStaticBlocks]"
GenTree* offsetOfMaxThreadStaticBlocks = gtNewIconNode(offsetOfMaxThreadStaticBlocksVal, TYP_I_IMPL);
GenTree* maxThreadStaticBlocksRef =
gtNewOperNode(GT_ADD, TYP_I_IMPL, gtCloneExpr(tlsLclValueUse), offsetOfMaxThreadStaticBlocks);
maxThreadStaticBlocksValue = gtNewIndir(TYP_INT, maxThreadStaticBlocksRef, GTF_IND_NONFAULTING | GTF_IND_INVARIANT);
GenTree* threadStaticBlocksRef = gtNewOperNode(GT_ADD, TYP_I_IMPL, gtCloneExpr(tlsLclValueUse),
gtNewIconNode(offsetOfThreadStaticBlocksVal, TYP_I_IMPL));
threadStaticBlocksValue = gtNewIndir(TYP_I_IMPL, threadStaticBlocksRef, GTF_IND_NONFAULTING | GTF_IND_INVARIANT);
// Create tree for "if (maxThreadStaticBlocks < typeIndex)"
GenTree* typeThreadStaticBlockIndexValue = call->gtArgs.GetArgByIndex(0)->GetNode();
GenTree* maxThreadStaticBlocksCond =
gtNewOperNode(GT_LT, TYP_INT, maxThreadStaticBlocksValue, gtCloneExpr(typeThreadStaticBlockIndexValue));
maxThreadStaticBlocksCond = gtNewOperNode(GT_JTRUE, TYP_VOID, maxThreadStaticBlocksCond);
// Create tree to "threadStaticBlockValue = threadStaticBlockBase[typeIndex]"
typeThreadStaticBlockIndexValue = gtNewOperNode(GT_MUL, TYP_INT, gtCloneExpr(typeThreadStaticBlockIndexValue),
gtNewIconNode(TARGET_POINTER_SIZE, TYP_INT));
GenTree* typeThreadStaticBlockRef =
gtNewOperNode(GT_ADD, TYP_I_IMPL, threadStaticBlocksValue, typeThreadStaticBlockIndexValue);
GenTree* typeThreadStaticBlockValue = gtNewIndir(TYP_I_IMPL, typeThreadStaticBlockRef, GTF_IND_NONFAULTING);
// Cache the threadStaticBlock value
unsigned threadStaticBlockBaseLclNum = lvaGrabTemp(true DEBUGARG("ThreadStaticBlockBase access"));
lvaTable[threadStaticBlockBaseLclNum].lvType = TYP_I_IMPL;
GenTree* threadStaticBlockBaseDef = gtNewStoreLclVarNode(threadStaticBlockBaseLclNum, typeThreadStaticBlockValue);
GenTree* threadStaticBlockBaseLclValueUse = gtNewLclVarNode(threadStaticBlockBaseLclNum);
// Create tree for "if (threadStaticBlockValue != nullptr)"
GenTree* threadStaticBlockNullCond =