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SPIR-🇹

⋯🢒 🇹arget 🠆 🇹ransform 🠆 🇹ranslate ⋯🢒

SPIR-🇹 is a research project aimed at exploring shader-oriented IR designs derived from SPIR-V, and producing a framework around such an IR to facilitate advanced compilation pipelines, beyond what existing SPIR-V tooling allows for.

🚧 This project is in active design and development, many details can and will change 🚧

— spirt 0.3.0’s README
    ^{(click through for the full version)}

Check out also the EmbarkStudios/spirt GitHub repository, for any additional developments.

Notable types/modules

IR data types

• Context: handles interning (Types, Consts, etc.) and allocating entity handles
• Module: owns Funcs and GlobalVars (rooted by exports)
• FuncDefBody: owns ControlRegions and DataInsts (rooted by body)

Utilities and passes

• print: pretty-printer with (styled and hyperlinked) HTML output
• spv::lower/spv::lift: conversion from/to SPIR-V
• cfg::Structurizer: (re)structurization from arbitrary control-flow

Modules

• cfg
  Control-flow graph (CFG) abstractions and utilities.
• context 🔒
  Context and related types/traits.
• func_at
  Traversal helpers for intra-function entities.
• passes
  IR transformations (typically whole-Module).
• print
  Pretty-printing anything in the IR, from whole Modules to their leaves.
• qptr
  QPtr-related type definitions and passes.
• spv
  SPIR-V support, mainly conversions to/from SPIR-T (lower/lift).
• transform
  Mutable IR traversal.
• visit
  Immutable IR traversal.

Structs

• AttrSet
  Interned handle for an AttrSetDef (a set of Attrs).
• AttrSetDef
  Definition for an AttrSet: a set of Attrs.
• Const
  Interned handle for a ConstDef (a constant value).
• ConstDef
  Definition for a Const: a constant value.
• Context
  Context object with global resources for SPIR-T.
• ControlNode
  Entity handle for a ControlNodeDef (a control-flow operator or leaf).
• ControlNodeDef
  Definition for a ControlNode: a control-flow operator or leaf.
• ControlNodeOutputDecl
• ControlRegion
  Entity handle for a ControlRegionDef (a control-flow region).
• ControlRegionDef
  Definition for a ControlRegion: a control-flow region.
• ControlRegionInputDecl
• DataInst
  Entity handle for a DataInstDef (an SSA instruction).
• DataInstDef
  Definition for a DataInst: an SSA instruction.
• DataInstForm
  Interned handle for a DataInstFormDef (a “form”, or “template”, for DataInstDefs).
• DataInstFormDef
  “Form” (or “template”) definition for DataInstFormDefs, which includes most of their common static information (notably excluding attrs, as they vary more often due to handling diagnostics, debuginfo, refinement etc.).
• Diag
  Diagnostics produced by SPIR-T passes, and recorded in Attr::Diagnostics.
• EntityDefs
  Collection holding the actual definitions for Context-allocated entities.
• EntityList
  Doubly-linked list, “intrusively” going through E::Def, which must be an EntityListNode<E, _> (to hold the “previous/next node” links).
• EntityListIter
  EntityList<E> iterator, but with a different API than Iterator.
• EntityOrientedDenseMap
  Map with K keys and V values, that is:
• Func
  Entity handle for a FuncDecl (a function).
• FuncDecl
  Declaration/definition for a Func: a function.
• FuncDefBody
  The body of a Func definition.
• FuncParam
• GlobalVar
  Entity handle for a GlobalVarDecl (a global variable).
• GlobalVarDecl
  Declaration/definition for a GlobalVar: a global variable.
• GlobalVarDefBody
  The body of a GlobalVar definition.
• InternedStr
  Interned handle for a str.
• Module
• OrdAssertEq
  Wrapper to limit Ord for interned index types (e.g. InternedStr) to only situations where the interned index reflects contents (i.e. equality).
• Type
  Interned handle for a TypeDef.
• TypeDef
  Definition for a Type.

Enums

• AddrSpace
• Attr
  Any semantic or non-semantic (debuginfo) decoration/modifier, that can be optionally applied to some declaration/definition.
• ConstCtor
  Const “constructor”: a ConstDef wiithout any nested Consts.
• ControlNodeKind
• DataInstKind
• DeclDef
  Declarations (GlobalVarDecl, FuncDecl) can contain a full definition, or only be an import of a definition (e.g. from another module).
• DiagLevel
  The “severity” level of a Diagnostic.
• DiagMsgPart
  One part of a Diagnostic message, allowing rich interpolation.
• ExportKey
  An unique identifier (e.g. a link name, or “symbol”) for a module export.
• Exportee
  A definition exported out of a module (see also ExportKey).
• Import
  An identifier (e.g. a link name, or “symbol”) for an import declaration.
• ModuleDebugInfo
  Non-semantic details (i.e. debuginfo) of a SPIR-Y module (not tied to any declarations/definitions).
• ModuleDialect
  Semantic properties of a SPIR-T module (not tied to any declarations/definitions).
• SelectionKind
• TypeCtor
  Type “constructor”: a TypeDef wiithout any TypeCtorArgs (Types/Consts).
• TypeCtorArg
• Value

Traits

• EntityOrientedMapKey
  EntityOriented*Map<Self, V> support trait, implemented for entity types, but which can also be implemented by users for their own newtypes and other types wrapping entity types (such as finite enums).