A helper class to facilitate the conversion from a Slang AST to MLIR operations. More...

#include <ImportVerilogInternals.h>

Collaboration diagram for circt::ImportVerilog::Context:

[legend]

Public Types
using	ValueSymbols = llvm::ScopedHashTable< const slang::ast::ValueSymbol *, Value >
	A table of defined values, such as variables, that may be referred to by name in expressions.

using	ValueSymbolScope = ValueSymbols::ScopeTy

Public Member Functions
	Context (const ImportVerilogOptions &options, slang::ast::Compilation &compilation, mlir::ModuleOp intoModuleOp, const slang::SourceManager &sourceManager)

	Context (const Context &)=delete

MLIRContext *	getContext ()
	Return the MLIR context.

Location	convertLocation (slang::SourceLocation loc)
	Convert a slang `SourceLocation` into an MLIR `Location`.

Location	convertLocation (slang::SourceRange range)
	Convert a slang `SourceRange` into an MLIR `Location`.

Type	convertType (const slang::ast::Type &type, LocationAttr loc={})
	Convert a slang type into an MLIR type.

Type	convertType (const slang::ast::DeclaredType &type)

LogicalResult	convertCompilation ()
	Convert hierarchy and structure AST nodes to MLIR ops.

ModuleLowering *	convertModuleHeader (const slang::ast::InstanceBodySymbol *module)
	Convert a module and its ports to an empty module op in the IR.

LogicalResult	convertModuleBody (const slang::ast::InstanceBodySymbol *module)
	Convert a module's body to the corresponding IR ops.

LogicalResult	convertPackage (const slang::ast::PackageSymbol &package)
	Convert a package and its contents.

FunctionLowering *	declareFunction (const slang::ast::SubroutineSymbol &subroutine)
	Convert a function and its arguments to a function declaration in the IR.

LogicalResult	convertFunction (const slang::ast::SubroutineSymbol &subroutine)
	Convert a function.

LogicalResult	convertStatement (const slang::ast::Statement &stmt)

Value	convertRvalueExpression (const slang::ast::Expression &expr, Type requiredType={})

Value	convertLvalueExpression (const slang::ast::Expression &expr)

Value	convertAssertionExpression (const slang::ast::AssertionExpr &expr, Location loc)

LogicalResult	collectHierarchicalValues (const slang::ast::Expression &expr, const slang::ast::Symbol &outermostModule)

LogicalResult	traverseInstanceBody (const slang::ast::Symbol &symbol)

LogicalResult	convertTimingControl (const slang::ast::TimingControl &ctrl, const slang::ast::Statement &stmt)

Value	convertToI1 (Value value)
	Helper function to convert a value to a MLIR I1 value.

Value	convertLTLTimingControl (const slang::ast::TimingControl &ctrl, const Value &seqOrPro)

Value	convertToBool (Value value)
	Helper function to convert a value to its "truthy" boolean value.

Value	convertToBool (Value value, Domain domain)
	Helper function to convert a value to its "truthy" boolean value and convert it to the given domain.

Value	convertToSimpleBitVector (Value value)
	Helper function to convert a value to its simple bit vector representation, if it has one.

Value	materializeConversion (Type type, Value value, bool isSigned, Location loc)
	Helper function to insert the necessary operations to cast a value from one type to another.

Value	materializeSVInt (const slang::SVInt &svint, const slang::ast::Type &type, Location loc)
	Helper function to materialize an `SVInt` as an SSA value.

Value	materializeConstant (const slang::ConstantValue &constant, const slang::ast::Type &type, Location loc)
	Helper function to materialize a `ConstantValue` as an SSA value.

FailureOr< Value >	convertFormatString (std::span< const slang::ast::Expression *const > arguments, Location loc, moore::IntFormat defaultFormat=moore::IntFormat::Decimal, bool appendNewline=false)
	Convert a list of string literal arguments with formatting specifiers and arguments to be interpolated into a `!moore.format_string` value.

FailureOr< Value >	convertSystemCallArity1 (const slang::ast::SystemSubroutine &subroutine, Location loc, Value value)
	Convert system function calls only have arity-1.

slang::ConstantValue	evaluateConstant (const slang::ast::Expression &expr)
	Evaluate the constant value of an expression.

Public Attributes
const ImportVerilogOptions &	options

slang::ast::Compilation &	compilation

mlir::ModuleOp	intoModuleOp

const slang::SourceManager &	sourceManager

OpBuilder	builder
	The builder used to create IR operations.

SymbolTable	symbolTable
	A symbol table of the MLIR module we are emitting into.

std::map< slang::SourceLocation, Operation * >	orderedRootOps
	The top-level operations ordered by their Slang source location.

DenseMap< const slang::ast::InstanceBodySymbol *, std::unique_ptr< ModuleLowering > >	modules
	How we have lowered modules to MLIR.

std::queue< const slang::ast::InstanceBodySymbol * >	moduleWorklist
	A list of modules for which the header has been created, but the body has not been converted yet.

DenseMap< const slang::ast::SubroutineSymbol *, std::unique_ptr< FunctionLowering > >	functions
	Functions that have already been converted.

ValueSymbols	valueSymbols

DenseMap< const slang::ast::InstanceBodySymbol *, SmallVector< HierPathInfo > >	hierPaths
	Collect all hierarchical names used for the per module/instance.

DenseSet< StringAttr >	sameHierPaths
	It's used to collect the repeat hierarchical names on the same path.

SmallVector< Value >	lvalueStack
	A stack of assignment left-hand side values.

SmallVector< LoopFrame >	loopStack
	A stack of loop continuation and exit blocks.

std::function< void(moore::ReadOp)>	rvalueReadCallback
	A listener called for every variable or net being read.

slang::TimeScale	timeScale
	The time scale currently in effect.

Detailed Description

A helper class to facilitate the conversion from a Slang AST to MLIR operations.

Keeps track of the destination MLIR module, builders, and various worklists and utilities needed for conversion.

Definition at line 79 of file ImportVerilogInternals.h.

Member Typedef Documentation

◆ ValueSymbols

using circt::ImportVerilog::Context::ValueSymbols = llvm::ScopedHashTable<const slang::ast::ValueSymbol *, Value>

A table of defined values, such as variables, that may be referred to by name in expressions.

The expressions use this table to lookup the MLIR value that was created for a given declaration in the Slang AST node.

Definition at line 216 of file ImportVerilogInternals.h.

◆ ValueSymbolScope

using circt::ImportVerilog::Context::ValueSymbolScope = ValueSymbols::ScopeTy

Definition at line 218 of file ImportVerilogInternals.h.

Constructor & Destructor Documentation

◆ Context() [1/2]

circt::ImportVerilog::Context::Context	(	const ImportVerilogOptions &	options,
		slang::ast::Compilation &	compilation,
		mlir::ModuleOp	intoModuleOp,
		const slang::SourceManager &	sourceManager
	)

inline

Definition at line 80 of file ImportVerilogInternals.h.

◆ Context() [2/2]

circt::ImportVerilog::Context::Context ( const Context & )

delete

Member Function Documentation

◆ collectHierarchicalValues()

LogicalResult Context::collectHierarchicalValues	(	const slang::ast::Expression &	expr,
		const slang::ast::Symbol &	outermostModule
	)

Definition at line 114 of file HierarchicalNames.cpp.

References convertLocation().

◆ convertAssertionExpression()

Value Context::convertAssertionExpression	(	const slang::ast::AssertionExpr &	expr,
		Location	loc
	)

Definition at line 295 of file AssertionExpr.cpp.

◆ convertCompilation()

LogicalResult Context::convertCompilation ( )

Convert hierarchy and structure AST nodes to MLIR ops.

Convert an entire Slang compilation to MLIR ops.

This is the main entry point for the conversion.

Definition at line 650 of file Structure.cpp.

References compilation, convertLocation(), convertModuleBody(), convertModuleHeader(), moduleWorklist, timeScale, and traverseInstanceBody().

◆ convertFormatString()

FailureOr< Value > Context::convertFormatString	(	std::span< const slang::ast::Expression *const >	arguments,
		Location	loc,
		moore::IntFormat	defaultFormat = `moore::IntFormat::Decimal`,
		bool	appendNewline = `false`
	)

Convert a list of string literal arguments with formatting specifiers and arguments to be interpolated into a !moore.format_string value.

Returns failure if an error occurs. Returns a null value if the formatted string is trivially empty. Otherwise returns the formatted string.

Definition at line 218 of file FormatStrings.cpp.

◆ convertFunction()

LogicalResult Context::convertFunction ( const slang::ast::SubroutineSymbol & subroutine )

Convert a function.

Definition at line 1050 of file Structure.cpp.

References builder, convertLocation(), convertStatement(), convertType(), declareFunction(), timeScale, and valueSymbols.

◆ convertLocation() [1/2]

Location Context::convertLocation ( slang::SourceLocation loc )

Convert a slang SourceLocation into an MLIR Location.

Definition at line 61 of file ImportVerilog.cpp.

References getContext(), and sourceManager.

Referenced by collectHierarchicalValues(), convertCompilation(), convertFunction(), convertLocation(), convertLTLTimingControl(), convertLvalueExpression(), convertModuleHeader(), convertPackage(), convertRvalueExpression(), convertStatement(), convertType(), convertType(), declareFunction(), handleRoot(), and traverseInstanceBody().

◆ convertLocation() [2/2]

Location Context::convertLocation ( slang::SourceRange range )

Convert a slang SourceRange into an MLIR Location.

Definition at line 65 of file ImportVerilog.cpp.

References convertLocation().

◆ convertLTLTimingControl()

Value Context::convertLTLTimingControl	(	const slang::ast::TimingControl &	ctrl,
		const Value &	seqOrPro
	)

Definition at line 264 of file TimingControls.cpp.

References builder, and convertLocation().

◆ convertLvalueExpression()

Value Context::convertLvalueExpression ( const slang::ast::Expression & expr )

Definition at line 1294 of file Expressions.cpp.

References convertLocation().

◆ convertModuleBody()

LogicalResult Context::convertModuleBody ( const slang::ast::InstanceBodySymbol * module )

Convert a module's body to the corresponding IR ops.

The module op must have already been created earlier through a convertModuleHeader call.

Definition at line 878 of file Structure.cpp.

References builder, hierPaths, modules, timeScale, and valueSymbols.

Referenced by convertCompilation().

◆ convertModuleHeader()

ModuleLowering * Context::convertModuleHeader ( const slang::ast::InstanceBodySymbol * module )

Convert a module and its ports to an empty module op in the IR.

Also adds the op to the worklist of module bodies to be lowered. This acts like a module "declaration", allowing instances to already refer to a module even before its body has been lowered.

Definition at line 699 of file Structure.cpp.

References builder, convertLocation(), convertType(), circt::hw::ModulePort::Input, modules, circt::hw::ModulePort::Output, and timeScale.

Referenced by convertCompilation().

◆ convertPackage()

LogicalResult Context::convertPackage ( const slang::ast::PackageSymbol & package )

Convert a package and its contents.

Definition at line 954 of file Structure.cpp.

References builder, convertLocation(), intoModuleOp, timeScale, and valueSymbols.

◆ convertRvalueExpression()

Value Context::convertRvalueExpression	(	const slang::ast::Expression &	expr,
		Type	requiredType = `{}`
	)

Definition at line 1284 of file Expressions.cpp.

References convertLocation(), and materializeConversion().

◆ convertStatement()

LogicalResult Context::convertStatement ( const slang::ast::Statement & stmt )

Definition at line 881 of file Statements.cpp.

References assert(), builder, and convertLocation().

Referenced by convertFunction(), and convertTimingControl().

◆ convertSystemCallArity1()

FailureOr< Value > Context::convertSystemCallArity1	(	const slang::ast::SystemSubroutine &	subroutine,
		Location	loc,
		Value	value
	)

Convert system function calls only have arity-1.

Definition at line 1510 of file Expressions.cpp.

References builder, and convertToSimpleBitVector().

◆ convertTimingControl()

LogicalResult Context::convertTimingControl	(	const slang::ast::TimingControl &	ctrl,
		const slang::ast::Statement &	stmt
	)

Definition at line 210 of file TimingControls.cpp.

References builder, convertStatement(), handleRoot(), and rvalueReadCallback.

◆ convertToBool() [1/2]

Value Context::convertToBool ( Value value )

Helper function to convert a value to its "truthy" boolean value.

Definition at line 1301 of file Expressions.cpp.

References builder.

Referenced by convertToBool().

◆ convertToBool() [2/2]

Value Context::convertToBool	(	Value	value,
		Domain	domain
	)

Helper function to convert a value to its "truthy" boolean value and convert it to the given domain.

Definition at line 1353 of file Expressions.cpp.

References convertToBool(), getContext(), and materializeConversion().

◆ convertToI1()

Value Context::convertToI1 ( Value value )

Helper function to convert a value to a MLIR I1 value.

Helper function to convert a value to an i1 value.

Definition at line 303 of file AssertionExpr.cpp.

References builder.

◆ convertToSimpleBitVector()

Value Context::convertToSimpleBitVector ( Value value )

Helper function to convert a value to its simple bit vector representation, if it has one.

Otherwise returns null. Also returns null if the given value is null.

Definition at line 1361 of file Expressions.cpp.

References materializeConversion().

Referenced by convertSystemCallArity1().

◆ convertType() [1/2]

Type Context::convertType ( const slang::ast::DeclaredType & type )

Definition at line 182 of file Types.cpp.

References convertLocation(), and convertType().

◆ convertType() [2/2]

Type Context::convertType	(	const slang::ast::Type &	type,
		LocationAttr	loc = `{}`
	)

Convert a slang type into an MLIR type.

Returns null on failure. Uses the provided location for error reporting, or tries to guess one from the given type. Types tend to have unreliable location information, so it's generally a good idea to pass in a location.

Definition at line 176 of file Types.cpp.

References convertLocation().

Referenced by convertFunction(), convertModuleHeader(), convertType(), declareFunction(), and materializeSVInt().

◆ declareFunction()

FunctionLowering * Context::declareFunction ( const slang::ast::SubroutineSymbol & subroutine )

Convert a function and its arguments to a function declaration in the IR.

This does not convert the function body.

Definition at line 976 of file Structure.cpp.

References builder, convertLocation(), convertType(), functions, getContext(), guessNamespacePrefix(), intoModuleOp, orderedRootOps, and symbolTable.

Referenced by convertFunction().

◆ evaluateConstant()

slang::ConstantValue Context::evaluateConstant ( const slang::ast::Expression & expr )

Evaluate the constant value of an expression.

Definition at line 1342 of file Expressions.cpp.

References compilation.

◆ getContext()

MLIRContext * circt::ImportVerilog::Context::getContext ( )

inline

Return the MLIR context.

Definition at line 90 of file ImportVerilogInternals.h.

References intoModuleOp.

Referenced by convertLocation(), convertToBool(), declareFunction(), and materializeSVInt().

◆ materializeConstant()

Value Context::materializeConstant	(	const slang::ConstantValue &	constant,
		const slang::ast::Type &	type,
		Location	loc
	)

Helper function to materialize a ConstantValue as an SSA value.

Returns null if the constant cannot be materialized.

Definition at line 1334 of file Expressions.cpp.

References materializeSVInt().

◆ materializeConversion()

Value Context::materializeConversion	(	Type	type,
		Value	value,
		bool	isSigned,
		Location	loc
	)

Helper function to insert the necessary operations to cast a value from one type to another.

Definition at line 1454 of file Expressions.cpp.

References assert(), builder, circt::moore::FourValued, materializePackedToSBVConversion(), materializeSBVToPackedConversion(), and circt::moore::TwoValued.

Referenced by convertRvalueExpression(), convertToBool(), convertToSimpleBitVector(), getSelectIndex(), and materializeSVInt().

◆ materializeSVInt()

Value Context::materializeSVInt	(	const slang::SVInt &	svint,
		const slang::ast::Type &	type,
		Location	loc
	)

Helper function to materialize an SVInt as an SSA value.

Materialize a Slang integer literal as a constant op.

Definition at line 1315 of file Expressions.cpp.

References builder, convertSVIntToFVInt(), convertType(), circt::moore::FourValued, getContext(), materializeConversion(), and circt::moore::TwoValued.

Referenced by materializeConstant().

◆ traverseInstanceBody()

LogicalResult Context::traverseInstanceBody ( const slang::ast::Symbol & symbol )

Definition at line 183 of file HierarchicalNames.cpp.

References convertLocation().

Referenced by convertCompilation().

Member Data Documentation

◆ builder

OpBuilder circt::ImportVerilog::Context::builder

The builder used to create IR operations.

Definition at line 192 of file ImportVerilogInternals.h.

Referenced by convertFunction(), convertLTLTimingControl(), convertModuleBody(), convertModuleHeader(), convertPackage(), convertStatement(), convertSystemCallArity1(), convertTimingControl(), convertToBool(), convertToI1(), declareFunction(), getSelectIndex(), handleRoot(), materializeConversion(), materializePackedToSBVConversion(), materializeSBVToPackedConversion(), and materializeSVInt().

◆ compilation

slang::ast::Compilation& circt::ImportVerilog::Context::compilation

Definition at line 187 of file ImportVerilogInternals.h.

Referenced by convertCompilation(), and evaluateConstant().

◆ functions

DenseMap<const slang::ast::SubroutineSymbol *, std::unique_ptr<FunctionLowering> > circt::ImportVerilog::Context::functions

Functions that have already been converted.

Definition at line 211 of file ImportVerilogInternals.h.

Referenced by declareFunction().

◆ hierPaths

DenseMap<const slang::ast::InstanceBodySymbol *, SmallVector<HierPathInfo> > circt::ImportVerilog::Context::hierPaths

Collect all hierarchical names used for the per module/instance.

Definition at line 223 of file ImportVerilogInternals.h.

Referenced by convertModuleBody().

◆ intoModuleOp

mlir::ModuleOp circt::ImportVerilog::Context::intoModuleOp

Definition at line 188 of file ImportVerilogInternals.h.

Referenced by convertPackage(), declareFunction(), and getContext().

◆ loopStack

SmallVector<LoopFrame> circt::ImportVerilog::Context::loopStack

A stack of loop continuation and exit blocks.

Each loop will push the relevant info onto this stack, lower its loop body statements, and pop the info off the stack again. Continue and break statements encountered as part of the loop body statements will use this information to branch to the correct block.

Definition at line 242 of file ImportVerilogInternals.h.

◆ lvalueStack

SmallVector<Value> circt::ImportVerilog::Context::lvalueStack

A stack of assignment left-hand side values.

Each assignment will push its lowered left-hand side onto this stack before lowering its right-hand side. This allows expressions to resolve the opaque LValueReferenceExpressions in the AST.

Definition at line 235 of file ImportVerilogInternals.h.

◆ modules

DenseMap<const slang::ast::InstanceBodySymbol *, std::unique_ptr<ModuleLowering> > circt::ImportVerilog::Context::modules

How we have lowered modules to MLIR.

Definition at line 203 of file ImportVerilogInternals.h.

Referenced by convertModuleBody(), and convertModuleHeader().

◆ moduleWorklist

std::queue<const slang::ast::InstanceBodySymbol *> circt::ImportVerilog::Context::moduleWorklist

A list of modules for which the header has been created, but the body has not been converted yet.

Definition at line 206 of file ImportVerilogInternals.h.

Referenced by convertCompilation().

◆ options

const ImportVerilogOptions& circt::ImportVerilog::Context::options

Definition at line 186 of file ImportVerilogInternals.h.

◆ orderedRootOps

std::map<slang::SourceLocation, Operation *> circt::ImportVerilog::Context::orderedRootOps

The top-level operations ordered by their Slang source location.

This is used to produce IR that follows the source file order.

Definition at line 198 of file ImportVerilogInternals.h.

Referenced by declareFunction().

◆ rvalueReadCallback

std::function<void(moore::ReadOp)> circt::ImportVerilog::Context::rvalueReadCallback

A listener called for every variable or net being read.

This can be used to collect all variables read as part of an expression or statement, for example to populate the list of observed signals in an implicit event control @*.

Definition at line 248 of file ImportVerilogInternals.h.

Referenced by convertTimingControl().

◆ sameHierPaths

DenseSet<StringAttr> circt::ImportVerilog::Context::sameHierPaths

It's used to collect the repeat hierarchical names on the same path.

Such as Top.sub.a and sub.a, they are equivalent. The variable "a" will be added to the port list. But we only record once. If we don't do that. We will view the strange IR, such as module @Sub(out y, out y);

Definition at line 229 of file ImportVerilogInternals.h.

◆ sourceManager

const slang::SourceManager& circt::ImportVerilog::Context::sourceManager

Definition at line 189 of file ImportVerilogInternals.h.

Referenced by convertLocation().

◆ symbolTable

SymbolTable circt::ImportVerilog::Context::symbolTable

A symbol table of the MLIR module we are emitting into.

Definition at line 194 of file ImportVerilogInternals.h.

Referenced by declareFunction().

◆ timeScale

slang::TimeScale circt::ImportVerilog::Context::timeScale

The time scale currently in effect.

Definition at line 251 of file ImportVerilogInternals.h.

Referenced by convertCompilation(), convertFunction(), convertModuleBody(), convertModuleHeader(), convertPackage(), and getTimeScaleInFemtoseconds().

◆ valueSymbols

ValueSymbols circt::ImportVerilog::Context::valueSymbols

Definition at line 219 of file ImportVerilogInternals.h.

Referenced by convertFunction(), convertModuleBody(), and convertPackage().

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

/home/runner/work/circt-www/circt-www/circt_src/lib/Conversion/ImportVerilog/ImportVerilogInternals.h
/home/runner/work/circt-www/circt-www/circt_src/lib/Conversion/ImportVerilog/AssertionExpr.cpp
/home/runner/work/circt-www/circt-www/circt_src/lib/Conversion/ImportVerilog/Expressions.cpp
/home/runner/work/circt-www/circt-www/circt_src/lib/Conversion/ImportVerilog/FormatStrings.cpp
/home/runner/work/circt-www/circt-www/circt_src/lib/Conversion/ImportVerilog/HierarchicalNames.cpp
/home/runner/work/circt-www/circt-www/circt_src/lib/Conversion/ImportVerilog/ImportVerilog.cpp
/home/runner/work/circt-www/circt-www/circt_src/lib/Conversion/ImportVerilog/Statements.cpp
/home/runner/work/circt-www/circt-www/circt_src/lib/Conversion/ImportVerilog/Structure.cpp
/home/runner/work/circt-www/circt-www/circt_src/lib/Conversion/ImportVerilog/TimingControls.cpp
/home/runner/work/circt-www/circt-www/circt_src/lib/Conversion/ImportVerilog/Types.cpp

Public Types

Public Member Functions

Public Attributes

Detailed Description

Member Typedef Documentation

◆ ValueSymbols

◆ ValueSymbolScope

Constructor & Destructor Documentation

◆ Context() [1/2]

◆ Context() [2/2]

Member Function Documentation

◆ collectHierarchicalValues()

◆ convertAssertionExpression()

◆ convertCompilation()

◆ convertFormatString()

◆ convertFunction()

◆ convertLocation() [1/2]

◆ convertLocation() [2/2]

◆ convertLTLTimingControl()

◆ convertLvalueExpression()

◆ convertModuleBody()

◆ convertModuleHeader()

◆ convertPackage()

◆ convertRvalueExpression()

◆ convertStatement()

◆ convertSystemCallArity1()

◆ convertTimingControl()

◆ convertToBool() [1/2]

◆ convertToBool() [2/2]

◆ convertToI1()

◆ convertToSimpleBitVector()

◆ convertType() [1/2]

◆ convertType() [2/2]

◆ declareFunction()

◆ evaluateConstant()

◆ getContext()

◆ materializeConstant()

◆ materializeConversion()

◆ materializeSVInt()

◆ traverseInstanceBody()

Member Data Documentation

◆ builder

◆ compilation

◆ functions

◆ hierPaths

◆ intoModuleOp

◆ loopStack

◆ lvalueStack

◆ modules

◆ moduleWorklist

◆ options

◆ orderedRootOps

◆ rvalueReadCallback

◆ sameHierPaths

◆ sourceManager

◆ symbolTable

◆ timeScale

◆ valueSymbols