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5c7f7462e4
This changes the shape of the statepoint intrinsic from:
@llvm.experimental.gc.statepoint(anyptr target, i32 # call args, i32 unused, ...call args, i32 # deopt args, ...deopt args, ...gc args)
to:
@llvm.experimental.gc.statepoint(anyptr target, i32 # call args, i32 flags, ...call args, i32 # transition args, ...transition args, i32 # deopt args, ...deopt args, ...gc args)
This extension offers the backend the opportunity to insert (somewhat) arbitrary code to manage the transition from GC-aware code to code that is not GC-aware and back.
In order to support the injection of transition code, this extension wraps the STATEPOINT ISD node generated by the usual lowering lowering with two additional nodes: GC_TRANSITION_START and GC_TRANSITION_END. The transition arguments that were passed passed to the intrinsic (if any) are lowered and provided as operands to these nodes and may be used by the backend during code generation.
Eventually, the lowering of the GC_TRANSITION_{START,END} nodes should be informed by the GC strategy in use for the function containing the intrinsic call; for now, these nodes are instead replaced with no-ops.
Differential Revision: http://reviews.llvm.org/D9501
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236888 91177308-0d34-0410-b5e6-96231b3b80d8
358 lines
14 KiB
C++
358 lines
14 KiB
C++
//===---- IRBuilder.cpp - Builder for LLVM Instrs -------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the IRBuilder class, which is used as a convenient way
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// to create LLVM instructions with a consistent and simplified interface.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/Function.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Statepoint.h"
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using namespace llvm;
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/// CreateGlobalString - Make a new global variable with an initializer that
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/// has array of i8 type filled in with the nul terminated string value
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/// specified. If Name is specified, it is the name of the global variable
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/// created.
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GlobalVariable *IRBuilderBase::CreateGlobalString(StringRef Str,
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const Twine &Name) {
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Constant *StrConstant = ConstantDataArray::getString(Context, Str);
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Module &M = *BB->getParent()->getParent();
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GlobalVariable *GV = new GlobalVariable(M, StrConstant->getType(),
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true, GlobalValue::PrivateLinkage,
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StrConstant);
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GV->setName(Name);
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GV->setUnnamedAddr(true);
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return GV;
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}
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Type *IRBuilderBase::getCurrentFunctionReturnType() const {
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assert(BB && BB->getParent() && "No current function!");
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return BB->getParent()->getReturnType();
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}
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Value *IRBuilderBase::getCastedInt8PtrValue(Value *Ptr) {
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PointerType *PT = cast<PointerType>(Ptr->getType());
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if (PT->getElementType()->isIntegerTy(8))
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return Ptr;
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// Otherwise, we need to insert a bitcast.
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PT = getInt8PtrTy(PT->getAddressSpace());
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BitCastInst *BCI = new BitCastInst(Ptr, PT, "");
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BB->getInstList().insert(InsertPt, BCI);
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SetInstDebugLocation(BCI);
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return BCI;
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}
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static CallInst *createCallHelper(Value *Callee, ArrayRef<Value *> Ops,
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IRBuilderBase *Builder,
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const Twine& Name="") {
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CallInst *CI = CallInst::Create(Callee, Ops, Name);
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Builder->GetInsertBlock()->getInstList().insert(Builder->GetInsertPoint(),CI);
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Builder->SetInstDebugLocation(CI);
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return CI;
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}
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static InvokeInst *createInvokeHelper(Value *Invokee, BasicBlock *NormalDest,
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BasicBlock *UnwindDest,
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ArrayRef<Value *> Ops,
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IRBuilderBase *Builder,
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const Twine &Name = "") {
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InvokeInst *II =
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InvokeInst::Create(Invokee, NormalDest, UnwindDest, Ops, Name);
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Builder->GetInsertBlock()->getInstList().insert(Builder->GetInsertPoint(),
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II);
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Builder->SetInstDebugLocation(II);
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return II;
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}
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CallInst *IRBuilderBase::
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CreateMemSet(Value *Ptr, Value *Val, Value *Size, unsigned Align,
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bool isVolatile, MDNode *TBAATag, MDNode *ScopeTag,
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MDNode *NoAliasTag) {
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Ptr = getCastedInt8PtrValue(Ptr);
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Value *Ops[] = { Ptr, Val, Size, getInt32(Align), getInt1(isVolatile) };
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Type *Tys[] = { Ptr->getType(), Size->getType() };
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Module *M = BB->getParent()->getParent();
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Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::memset, Tys);
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CallInst *CI = createCallHelper(TheFn, Ops, this);
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// Set the TBAA info if present.
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if (TBAATag)
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CI->setMetadata(LLVMContext::MD_tbaa, TBAATag);
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if (ScopeTag)
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CI->setMetadata(LLVMContext::MD_alias_scope, ScopeTag);
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if (NoAliasTag)
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CI->setMetadata(LLVMContext::MD_noalias, NoAliasTag);
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return CI;
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}
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CallInst *IRBuilderBase::
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CreateMemCpy(Value *Dst, Value *Src, Value *Size, unsigned Align,
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bool isVolatile, MDNode *TBAATag, MDNode *TBAAStructTag,
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MDNode *ScopeTag, MDNode *NoAliasTag) {
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Dst = getCastedInt8PtrValue(Dst);
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Src = getCastedInt8PtrValue(Src);
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Value *Ops[] = { Dst, Src, Size, getInt32(Align), getInt1(isVolatile) };
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Type *Tys[] = { Dst->getType(), Src->getType(), Size->getType() };
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Module *M = BB->getParent()->getParent();
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Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::memcpy, Tys);
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CallInst *CI = createCallHelper(TheFn, Ops, this);
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// Set the TBAA info if present.
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if (TBAATag)
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CI->setMetadata(LLVMContext::MD_tbaa, TBAATag);
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// Set the TBAA Struct info if present.
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if (TBAAStructTag)
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CI->setMetadata(LLVMContext::MD_tbaa_struct, TBAAStructTag);
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if (ScopeTag)
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CI->setMetadata(LLVMContext::MD_alias_scope, ScopeTag);
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if (NoAliasTag)
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CI->setMetadata(LLVMContext::MD_noalias, NoAliasTag);
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return CI;
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}
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CallInst *IRBuilderBase::
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CreateMemMove(Value *Dst, Value *Src, Value *Size, unsigned Align,
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bool isVolatile, MDNode *TBAATag, MDNode *ScopeTag,
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MDNode *NoAliasTag) {
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Dst = getCastedInt8PtrValue(Dst);
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Src = getCastedInt8PtrValue(Src);
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Value *Ops[] = { Dst, Src, Size, getInt32(Align), getInt1(isVolatile) };
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Type *Tys[] = { Dst->getType(), Src->getType(), Size->getType() };
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Module *M = BB->getParent()->getParent();
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Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::memmove, Tys);
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CallInst *CI = createCallHelper(TheFn, Ops, this);
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// Set the TBAA info if present.
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if (TBAATag)
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CI->setMetadata(LLVMContext::MD_tbaa, TBAATag);
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if (ScopeTag)
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CI->setMetadata(LLVMContext::MD_alias_scope, ScopeTag);
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if (NoAliasTag)
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CI->setMetadata(LLVMContext::MD_noalias, NoAliasTag);
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return CI;
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}
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CallInst *IRBuilderBase::CreateLifetimeStart(Value *Ptr, ConstantInt *Size) {
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assert(isa<PointerType>(Ptr->getType()) &&
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"lifetime.start only applies to pointers.");
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Ptr = getCastedInt8PtrValue(Ptr);
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if (!Size)
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Size = getInt64(-1);
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else
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assert(Size->getType() == getInt64Ty() &&
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"lifetime.start requires the size to be an i64");
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Value *Ops[] = { Size, Ptr };
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Module *M = BB->getParent()->getParent();
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Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::lifetime_start);
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return createCallHelper(TheFn, Ops, this);
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}
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CallInst *IRBuilderBase::CreateLifetimeEnd(Value *Ptr, ConstantInt *Size) {
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assert(isa<PointerType>(Ptr->getType()) &&
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"lifetime.end only applies to pointers.");
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Ptr = getCastedInt8PtrValue(Ptr);
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if (!Size)
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Size = getInt64(-1);
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else
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assert(Size->getType() == getInt64Ty() &&
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"lifetime.end requires the size to be an i64");
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Value *Ops[] = { Size, Ptr };
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Module *M = BB->getParent()->getParent();
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Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::lifetime_end);
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return createCallHelper(TheFn, Ops, this);
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}
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CallInst *IRBuilderBase::CreateAssumption(Value *Cond) {
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assert(Cond->getType() == getInt1Ty() &&
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"an assumption condition must be of type i1");
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Value *Ops[] = { Cond };
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Module *M = BB->getParent()->getParent();
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Value *FnAssume = Intrinsic::getDeclaration(M, Intrinsic::assume);
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return createCallHelper(FnAssume, Ops, this);
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}
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/// Create a call to a Masked Load intrinsic.
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/// Ptr - the base pointer for the load
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/// Align - alignment of the source location
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/// Mask - an vector of booleans which indicates what vector lanes should
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/// be accessed in memory
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/// PassThru - a pass-through value that is used to fill the masked-off lanes
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/// of the result
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/// Name - name of the result variable
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CallInst *IRBuilderBase::CreateMaskedLoad(Value *Ptr, unsigned Align,
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Value *Mask, Value *PassThru,
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const Twine &Name) {
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assert(Ptr->getType()->isPointerTy() && "Ptr must be of pointer type");
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// DataTy is the overloaded type
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Type *DataTy = cast<PointerType>(Ptr->getType())->getElementType();
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assert(DataTy->isVectorTy() && "Ptr should point to a vector");
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if (!PassThru)
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PassThru = UndefValue::get(DataTy);
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Value *Ops[] = { Ptr, getInt32(Align), Mask, PassThru};
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return CreateMaskedIntrinsic(Intrinsic::masked_load, Ops, DataTy, Name);
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}
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/// Create a call to a Masked Store intrinsic.
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/// Val - the data to be stored,
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/// Ptr - the base pointer for the store
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/// Align - alignment of the destination location
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/// Mask - an vector of booleans which indicates what vector lanes should
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/// be accessed in memory
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CallInst *IRBuilderBase::CreateMaskedStore(Value *Val, Value *Ptr,
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unsigned Align, Value *Mask) {
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Value *Ops[] = { Val, Ptr, getInt32(Align), Mask };
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// Type of the data to be stored - the only one overloaded type
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return CreateMaskedIntrinsic(Intrinsic::masked_store, Ops, Val->getType());
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}
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/// Create a call to a Masked intrinsic, with given intrinsic Id,
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/// an array of operands - Ops, and one overloaded type - DataTy
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CallInst *IRBuilderBase::CreateMaskedIntrinsic(unsigned Id,
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ArrayRef<Value *> Ops,
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Type *DataTy,
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const Twine &Name) {
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Module *M = BB->getParent()->getParent();
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Type *OverloadedTypes[] = { DataTy };
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Value *TheFn = Intrinsic::getDeclaration(M, (Intrinsic::ID)Id, OverloadedTypes);
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return createCallHelper(TheFn, Ops, this, Name);
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}
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static std::vector<Value *> getStatepointArgs(IRBuilderBase &B,
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Value *ActualCallee,
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ArrayRef<Value *> CallArgs,
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ArrayRef<Value *> DeoptArgs,
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ArrayRef<Value *> GCArgs) {
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std::vector<Value *> Args;
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Args.push_back(ActualCallee);
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Args.push_back(B.getInt32(CallArgs.size()));
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Args.push_back(B.getInt32((unsigned)StatepointFlags::None));
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Args.insert(Args.end(), CallArgs.begin(), CallArgs.end());
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Args.push_back(B.getInt32(0 /* no transition args */));
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Args.push_back(B.getInt32(DeoptArgs.size()));
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Args.insert(Args.end(), DeoptArgs.begin(), DeoptArgs.end());
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Args.insert(Args.end(), GCArgs.begin(), GCArgs.end());
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return Args;
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}
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CallInst *IRBuilderBase::CreateGCStatepointCall(Value *ActualCallee,
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ArrayRef<Value *> CallArgs,
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ArrayRef<Value *> DeoptArgs,
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ArrayRef<Value *> GCArgs,
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const Twine &Name) {
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// Extract out the type of the callee.
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PointerType *FuncPtrType = cast<PointerType>(ActualCallee->getType());
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assert(isa<FunctionType>(FuncPtrType->getElementType()) &&
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"actual callee must be a callable value");
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Module *M = BB->getParent()->getParent();
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// Fill in the one generic type'd argument (the function is also vararg)
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Type *ArgTypes[] = { FuncPtrType };
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Function *FnStatepoint =
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Intrinsic::getDeclaration(M, Intrinsic::experimental_gc_statepoint,
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ArgTypes);
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std::vector<llvm::Value *> Args =
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getStatepointArgs(*this, ActualCallee, CallArgs, DeoptArgs, GCArgs);
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return createCallHelper(FnStatepoint, Args, this, Name);
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}
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CallInst *IRBuilderBase::CreateGCStatepointCall(Value *ActualCallee,
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ArrayRef<Use> CallArgs,
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ArrayRef<Value *> DeoptArgs,
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ArrayRef<Value *> GCArgs,
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const Twine &Name) {
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std::vector<Value *> VCallArgs;
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for (auto &U : CallArgs)
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VCallArgs.push_back(U.get());
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return CreateGCStatepointCall(ActualCallee, VCallArgs, DeoptArgs, GCArgs,
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Name);
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}
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InvokeInst *IRBuilderBase::CreateGCStatepointInvoke(
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Value *ActualInvokee, BasicBlock *NormalDest, BasicBlock *UnwindDest,
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ArrayRef<Value *> InvokeArgs, ArrayRef<Value *> DeoptArgs,
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ArrayRef<Value *> GCArgs, const Twine &Name) {
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// Extract out the type of the callee.
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PointerType *FuncPtrType = cast<PointerType>(ActualInvokee->getType());
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assert(isa<FunctionType>(FuncPtrType->getElementType()) &&
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"actual callee must be a callable value");
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Module *M = BB->getParent()->getParent();
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// Fill in the one generic type'd argument (the function is also vararg)
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Function *FnStatepoint = Intrinsic::getDeclaration(
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M, Intrinsic::experimental_gc_statepoint, {FuncPtrType});
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std::vector<llvm::Value *> Args =
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getStatepointArgs(*this, ActualInvokee, InvokeArgs, DeoptArgs, GCArgs);
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return createInvokeHelper(FnStatepoint, NormalDest, UnwindDest, Args, this,
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Name);
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}
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InvokeInst *IRBuilderBase::CreateGCStatepointInvoke(
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Value *ActualInvokee, BasicBlock *NormalDest, BasicBlock *UnwindDest,
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ArrayRef<Use> InvokeArgs, ArrayRef<Value *> DeoptArgs,
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ArrayRef<Value *> GCArgs, const Twine &Name) {
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std::vector<Value *> VCallArgs;
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for (auto &U : InvokeArgs)
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VCallArgs.push_back(U.get());
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return CreateGCStatepointInvoke(ActualInvokee, NormalDest, UnwindDest,
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VCallArgs, DeoptArgs, GCArgs, Name);
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}
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CallInst *IRBuilderBase::CreateGCResult(Instruction *Statepoint,
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Type *ResultType,
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const Twine &Name) {
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Intrinsic::ID ID = Intrinsic::experimental_gc_result;
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Module *M = BB->getParent()->getParent();
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Type *Types[] = {ResultType};
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Value *FnGCResult = Intrinsic::getDeclaration(M, ID, Types);
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Value *Args[] = {Statepoint};
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return createCallHelper(FnGCResult, Args, this, Name);
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}
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CallInst *IRBuilderBase::CreateGCRelocate(Instruction *Statepoint,
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int BaseOffset,
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int DerivedOffset,
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Type *ResultType,
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const Twine &Name) {
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Module *M = BB->getParent()->getParent();
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Type *Types[] = {ResultType};
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Value *FnGCRelocate =
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Intrinsic::getDeclaration(M, Intrinsic::experimental_gc_relocate, Types);
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Value *Args[] = {Statepoint,
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getInt32(BaseOffset),
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getInt32(DerivedOffset)};
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return createCallHelper(FnGCRelocate, Args, this, Name);
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}
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