circt::BackedgeBuilder Class Reference

Instantiate one of these and use it to build typed backedges. More...

#include <BackedgeBuilder.h>

Collaboration diagram for circt::BackedgeBuilder:

Public Member Functions
	BackedgeBuilder (mlir::OpBuilder &builder, mlir::Location loc)
	To build a backedge op and manipulate it, we need a PatternRewriter and a Location. More...
	BackedgeBuilder (mlir::PatternRewriter &rewriter, mlir::Location loc)
	~BackedgeBuilder ()
Backedge	get (mlir::Type resultType, mlir::LocationAttr optionalLoc={})
	Create a typed backedge. More...
mlir::LogicalResult	clearOrEmitError ()
	Clear the backedges, erasing any remaining cursor ops. More...
void	abandon ()
	Abandon the backedges, suppressing any diagnostics if they are still active upon destruction of the backedge builder. More...

Private Attributes
mlir::OpBuilder &	builder
mlir::PatternRewriter *	rewriter
mlir::Location	loc
llvm::SmallVector< mlir::Operation *, 16 >	edges

Friends
class	Backedge

Detailed Description

Instantiate one of these and use it to build typed backedges.

Backedges which get used as operands must be assigned to with the actual value before this class is destructed, usually at the end of a scope. It will check that invariant then erase all the backedge ops during destruction.

Example use:

circt::BackedgeBuilder back(rewriter, loc);
circt::Backedge ready = back.get(rewriter.getI1Type());
// Use `ready` as a `Value`.
auto addOp = rewriter.create<addOp>(loc, ready);
// When the actual value is available,
ready.set(anotherOp.getResult(0));

Definition at line 46 of file BackedgeBuilder.h.

Constructor & Destructor Documentation

BackedgeBuilder() [1/2]

circt::BackedgeBuilder::BackedgeBuilder	(	mlir::OpBuilder &	builder,
		mlir::Location	loc
	)

To build a backedge op and manipulate it, we need a PatternRewriter and a Location.

Store them during construct of this instance and use them when building.

BackedgeBuilder() [2/2]

circt::BackedgeBuilder::BackedgeBuilder	(	mlir::PatternRewriter &	rewriter,
		mlir::Location	loc
	)

~BackedgeBuilder()

BackedgeBuilder::~BackedgeBuilder

(

)

Definition at line 35 of file BackedgeBuilder.cpp.

References clearOrEmitError().

Member Function Documentation

abandon()

void BackedgeBuilder::abandon

(

)

Abandon the backedges, suppressing any diagnostics if they are still active upon destruction of the backedge builder.

Also, any currently existing cursor ops will be abandoned.

Definition at line 59 of file BackedgeBuilder.cpp.

References edges.

clearOrEmitError()

LogicalResult BackedgeBuilder::clearOrEmitError

(

)

Clear the backedges, erasing any remaining cursor ops.

Returns failure and emits diagnostic messages if a backedge is still active.

Definition at line 37 of file BackedgeBuilder.cpp.

References edges, loc, and rewriter.

Referenced by ~BackedgeBuilder().

get()

Backedge BackedgeBuilder::get	(	mlir::Type	resultType,
		mlir::LocationAttr	optionalLoc = {}
	)

Create a typed backedge.

If no location is provided, the one passed to the constructor will be used.

Definition at line 65 of file BackedgeBuilder.cpp.

References Backedge, builder, edges, and loc.

Referenced by circt::handshake::HandshakeLowering::insertMerge(), instantiateSystemVerilogMemory(), circt::handshake::lockRegion(), and circt::hw::PortConverterImpl::updateInstance().

Friends And Related Function Documentation

Backedge

friend class Backedge

friend

Definition at line 47 of file BackedgeBuilder.h.

Referenced by get().

Member Data Documentation

builder

mlir::OpBuilder& circt::BackedgeBuilder::builder

private

Definition at line 71 of file BackedgeBuilder.h.

Referenced by get().

edges

llvm::SmallVector<mlir::Operation *, 16> circt::BackedgeBuilder::edges

private

Definition at line 74 of file BackedgeBuilder.h.

Referenced by Python.support.BackedgeBuilder::__exit__(), Python.support.BackedgeBuilder::_create(), abandon(), clearOrEmitError(), and get().

loc

mlir::Location circt::BackedgeBuilder::loc

private

Definition at line 73 of file BackedgeBuilder.h.

Referenced by clearOrEmitError(), and get().

rewriter

mlir::PatternRewriter* circt::BackedgeBuilder::rewriter

private

Definition at line 72 of file BackedgeBuilder.h.

Referenced by clearOrEmitError().

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The documentation for this class was generated from the following files:

• /home/runner/work/circt-www/circt-www/circt_src/include/circt/Support/BackedgeBuilder.h
• /home/runner/work/circt-www/circt-www/circt_src/lib/Support/BackedgeBuilder.cpp