AsyncToAsyncRuntime.cpp File Reference

#include <utility>
#include "mlir/Dialect/Async/Passes.h"
#include "PassDetail.h"
#include "mlir/Conversion/SCFToControlFlow/SCFToControlFlow.h"
#include "mlir/Dialect/Arith/IR/Arith.h"
#include "mlir/Dialect/Async/IR/Async.h"
#include "mlir/Dialect/ControlFlow/IR/ControlFlowOps.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/Dialect/SCF/IR/SCF.h"
#include "mlir/IR/IRMapping.h"
#include "mlir/IR/ImplicitLocOpBuilder.h"
#include "mlir/IR/PatternMatch.h"
#include "mlir/Transforms/DialectConversion.h"
#include "mlir/Transforms/RegionUtils.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/Support/Debug.h"
#include <optional>
#include "mlir/Dialect/Async/Passes.h.inc"

Go to the source code of this file.

Classes
class	YieldOpLowering
class	AssertOpLowering

Namespaces
	mlir
	Include the generated interface declarations.

Macros
#define	GEN_PASS_DEF_ASYNCTOASYNCRUNTIME
#define	GEN_PASS_DEF_ASYNCFUNCTOASYNCRUNTIME
#define	DEBUG_TYPE   "async-to-async-runtime"

Typedefs
using	FuncCoroMapPtr = std::shared_ptr< llvm::DenseMap< func::FuncOp, CoroMachinery > >

Functions
static CoroMachinery	setupCoroMachinery (func::FuncOp func)
	Utility to partially update the regular function CFG to the coroutine CFG compatible with LLVM coroutines switched-resume lowering using async.runtime. More...
static Block *	setupSetErrorBlock (CoroMachinery &coro)
static std::pair< func::FuncOp, CoroMachinery >	outlineExecuteOp (SymbolTable &symbolTable, ExecuteOp execute)
	Outline the body region attached to the async.execute op into a standalone function. More...

Variables
static constexpr const char	kAsyncFnPrefix [] = "async_execute_fn"

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "async-to-async-runtime"

Definition at line 43 of file AsyncToAsyncRuntime.cpp.

GEN_PASS_DEF_ASYNCFUNCTOASYNCRUNTIME

#define GEN_PASS_DEF_ASYNCFUNCTOASYNCRUNTIME

Definition at line 36 of file AsyncToAsyncRuntime.cpp.

GEN_PASS_DEF_ASYNCTOASYNCRUNTIME

#define GEN_PASS_DEF_ASYNCTOASYNCRUNTIME

Definition at line 35 of file AsyncToAsyncRuntime.cpp.

Typedef Documentation

FuncCoroMapPtr

using FuncCoroMapPtr = std::shared_ptr<llvm::DenseMap<func::FuncOp, CoroMachinery> >

Definition at line 124 of file AsyncToAsyncRuntime.cpp.

Function Documentation

outlineExecuteOp()

static std::pair<func::FuncOp, CoroMachinery> outlineExecuteOp ( SymbolTable &  symbolTable, ExecuteOp  execute  )

static

Outline the body region attached to the async.execute op into a standalone function.

Note that this is not reversible transformation.

Definition at line 296 of file AsyncToAsyncRuntime.cpp.

References mlir::ImplicitLocOpBuilder::atBlockBegin(), mlir::async::cloneConstantsIntoTheRegion(), mlir::get(), mlir::Value::getType(), mlir::getUsedValuesDefinedAbove(), mlir::SymbolTable::insert(), kAsyncFnPrefix, mlir::IRMapping::map(), mlir::SymbolTable::Private, and mlir::SymbolTable::setSymbolVisibility().

setupCoroMachinery()

static CoroMachinery setupCoroMachinery ( func::FuncOp  func )

static

Utility to partially update the regular function CFG to the coroutine CFG compatible with LLVM coroutines switched-resume lowering using async.runtime.

* and async.coro.* operations. Adds a new entry block that branches into preexisting entry block. Also inserts trailing blocks.

The result types of the passed func start with an optional async.token and be continued with some number of async.values.

See LLVM coroutines documentation: https://llvm.org/docs/Coroutines.html

• entry block sets up the coroutine.
• set_error block sets completion token and async values state to error.
• cleanup block cleans up the coroutine state.
• `suspend block after the @llvm.coro.end() defines what value will be returned to the initial caller of a coroutine. Everything before the @llvm.coro.end() will be executed at every suspension point.

Coroutine structure (only the important bits):

func @some_fn(<function-arguments>) -> (!async.token, !async.value<T>) { ^entry(<function-arguments>): token = <async token> : !async.token // create async runtime token value = <async value> : !async.value<T> // create async value id = async.coro.getId // create a coroutine id hdl = async.coro.begin id // create a coroutine handle cf.br ^preexisting_entry_block

/* preexisting blocks modified to branch to the cleanup block *‍/

^set_error: // this block created lazily only if needed (see code below) async.runtime.set_error token : !async.token async.runtime.set_error value : !async.value<T> cf.br ^cleanup

^cleanup: async.coro.free hdl // delete the coroutine state cf.br ^suspend

^suspend: async.coro.end hdl // marks the end of a coroutine return token, value : !async.token, !async.value<T> }

Definition at line 171 of file AsyncToAsyncRuntime.cpp.

References mlir::ImplicitLocOpBuilder::atBlockBegin(), mlir::Block::front(), mlir::get(), mlir::Block::getOperations(), and mlir::Block::splitBlock().

setupSetErrorBlock()

static Block* setupSetErrorBlock ( CoroMachinery &  coro )

static

Definition at line 264 of file AsyncToAsyncRuntime.cpp.

References mlir::ImplicitLocOpBuilder::atBlockBegin().

Variable Documentation

kAsyncFnPrefix

constexpr const char kAsyncFnPrefix[] = "async_execute_fn"

staticconstexpr

Definition at line 45 of file AsyncToAsyncRuntime.cpp.

Referenced by outlineExecuteOp().