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d36a0f0f41
Summary:
If an alloca need to be stored in the coroutine frame and it has an alignment specified and the alignment does not match the natural alignment of the alloca type. Insert appropriate padding into the coroutine frame to make sure that it gets requested alignment.
For example for a packet type (which natural alignment is 1), but alloca alignment is 8, we may need to insert a padding field with required number of bytes to make sure it is properly aligned.
```
%PackedStruct = type <{ i64 }>
...
%data = alloca %PackedStruct, align 8
```
If the previous field in the coroutine frame had alignment 2, we would have [6 x i8] inserted before %PackedStruct in the coroutine frame:
```
%f.Frame = type { ..., i16, [6 x i8], %PackedStruct }
```
Reviewers: rnk, lewissbaker, modocache
Reviewed By: modocache
Subscribers: EricWF, llvm-commits
Differential Revision: https://reviews.llvm.org/D45221
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@329112 91177308-0d34-0410-b5e6-96231b3b80d8
107 lines
3.5 KiB
C++
107 lines
3.5 KiB
C++
//===- CoroInternal.h - Internal Coroutine interfaces ---------*- C++ -*---===//
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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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// Common definitions/declarations used internally by coroutine lowering passes.
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TRANSFORMS_COROUTINES_COROINTERNAL_H
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#define LLVM_LIB_TRANSFORMS_COROUTINES_COROINTERNAL_H
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#include "CoroInstr.h"
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#include "llvm/Transforms/Coroutines.h"
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namespace llvm {
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class CallGraph;
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class CallGraphSCC;
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class PassRegistry;
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void initializeCoroEarlyPass(PassRegistry &);
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void initializeCoroSplitPass(PassRegistry &);
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void initializeCoroElidePass(PassRegistry &);
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void initializeCoroCleanupPass(PassRegistry &);
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// CoroEarly pass marks every function that has coro.begin with a string
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// attribute "coroutine.presplit"="0". CoroSplit pass processes the coroutine
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// twice. First, it lets it go through complete IPO optimization pipeline as a
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// single function. It forces restart of the pipeline by inserting an indirect
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// call to an empty function "coro.devirt.trigger" which is devirtualized by
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// CoroElide pass that triggers a restart of the pipeline by CGPassManager.
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// When CoroSplit pass sees the same coroutine the second time, it splits it up,
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// adds coroutine subfunctions to the SCC to be processed by IPO pipeline.
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#define CORO_PRESPLIT_ATTR "coroutine.presplit"
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#define UNPREPARED_FOR_SPLIT "0"
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#define PREPARED_FOR_SPLIT "1"
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#define CORO_DEVIRT_TRIGGER_FN "coro.devirt.trigger"
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namespace coro {
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bool declaresIntrinsics(Module &M, std::initializer_list<StringRef>);
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void replaceAllCoroAllocs(CoroBeginInst *CB, bool Replacement);
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void replaceAllCoroFrees(CoroBeginInst *CB, Value *Replacement);
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void replaceCoroFree(CoroIdInst *CoroId, bool Elide);
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void updateCallGraph(Function &Caller, ArrayRef<Function *> Funcs,
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CallGraph &CG, CallGraphSCC &SCC);
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// Keeps data and helper functions for lowering coroutine intrinsics.
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struct LowererBase {
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Module &TheModule;
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LLVMContext &Context;
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PointerType *const Int8Ptr;
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FunctionType *const ResumeFnType;
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ConstantPointerNull *const NullPtr;
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LowererBase(Module &M);
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Value *makeSubFnCall(Value *Arg, int Index, Instruction *InsertPt);
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};
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// Holds structural Coroutine Intrinsics for a particular function and other
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// values used during CoroSplit pass.
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struct LLVM_LIBRARY_VISIBILITY Shape {
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CoroBeginInst *CoroBegin;
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SmallVector<CoroEndInst *, 4> CoroEnds;
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SmallVector<CoroSizeInst *, 2> CoroSizes;
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SmallVector<CoroSuspendInst *, 4> CoroSuspends;
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// Field Indexes for known coroutine frame fields.
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enum {
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ResumeField,
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DestroyField,
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PromiseField,
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IndexField,
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};
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StructType *FrameTy;
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Instruction *FramePtr;
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BasicBlock *AllocaSpillBlock;
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SwitchInst *ResumeSwitch;
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AllocaInst *PromiseAlloca;
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bool HasFinalSuspend;
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IntegerType *getIndexType() const {
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assert(FrameTy && "frame type not assigned");
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return cast<IntegerType>(FrameTy->getElementType(IndexField));
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}
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ConstantInt *getIndex(uint64_t Value) const {
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return ConstantInt::get(getIndexType(), Value);
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}
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Shape() = default;
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explicit Shape(Function &F) { buildFrom(F); }
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void buildFrom(Function &F);
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};
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void buildCoroutineFrame(Function &F, Shape &Shape);
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} // End namespace coro.
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} // End namespace llvm
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#endif
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