P4C
The P4 Compiler
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P4::ReplaceHeaders Class Reference

#include <flattenHeaders.h>

Inheritance diagram for P4::ReplaceHeaders:
[legend]

Public Member Functions

 ReplaceHeaders (P4::TypeMap *typeMap, FindHeaderTypesToReplace *findHeaderTypesToReplace)
 
const IR::Nodepostorder (IR::Member *expression) override
 
const IR::Nodepostorder (IR::Type_Header *type) override
 
const IR::Nodepreorder (IR::P4Program *program) override
 
- Public Member Functions inherited from P4::Transform
const IR::Nodeapply_visitor (const IR::Node *, const char *name=0) override
 
profile_t init_apply (const IR::Node *root) override
 
virtual void loop_revisit (const IR::Node *)
 
virtual const IR::Nodepostorder (IR::Node *n)
 
virtual const IR::Nodepreorder (IR::Node *n)
 
void prune ()
 
virtual void revisit (const IR::Node *, const IR::Node *)
 
void revisit_visited ()
 
bool visit_in_progress (const IR::Node *) const
 
void visitAgain () const override
 
void visitOnce () const override
 
- Public Member Functions inherited from P4::Visitor
virtual bool check_global (cstring)
 
virtual void clear_globals ()
 
virtual Visitorclone () const
 
virtual ControlFlowVisitorcontrolFlowVisitor ()
 
virtual void end_apply ()
 
virtual void end_apply (const IR::Node *root)
 
virtual void erase_global (cstring)
 
template<class T >
const T * findContext () const
 
template<class T >
const T * findContext (const Context *&c) const
 
template<class T >
const T * findOrigCtxt () const
 
template<class T >
const T * findOrigCtxt (const Context *&c) const
 
virtual Visitorflow_clone ()
 
virtual void flow_merge (Visitor &)
 
virtual bool flow_merge_closure (Visitor &)
 
virtual void flow_merge_global_from (cstring)
 
virtual void flow_merge_global_to (cstring)
 
const ContextgetChildContext () const
 
int getChildrenVisited () const
 
const ContextgetContext () const
 
int getContextDepth () const
 
const IR::NodegetCurrentNode () const
 
template<class T >
const T * getCurrentNode () const
 
const IR::NodegetOriginal () const
 
template<class T >
const T * getOriginal () const
 
template<class T >
const T * getParent () const
 
virtual bool has_flow_joins () const
 
profile_t init_apply (const IR::Node *root, const Context *parent_context)
 
bool isInContext (const IR::Node *n) const
 
virtual const char * name () const
 
template<class T >
void parallel_visit (const IR::Vector< T > &v, const char *name, int cidx)
 
template<class T >
void parallel_visit (const IR::Vector< T > &v, const char *name=0)
 
template<class T >
void parallel_visit (IR::Vector< T > &v, const char *name, int cidx)
 
template<class T >
void parallel_visit (IR::Vector< T > &v, const char *name=0)
 
void print_context () const
 
const VisitorsetCalledBy (const Visitor *visitor)
 
void setName (const char *name)
 
void visit (const IR::Node &n, const char *name, int cidx)
 
void visit (const IR::Node &n, const char *name=0)
 
void visit (const IR::Node *&n, const char *name, int cidx)
 
void visit (const IR::Node *&n, const char *name=0)
 
void visit (const IR::Node *const &n, const char *name, int cidx)
 
void visit (const IR::Node *const &n, const char *name=0)
 
void visit (IR::Node &n, const char *name, int cidx)
 
void visit (IR::Node &n, const char *name=0)
 
void visit (IR::Node *&, const char *=0, int=0)
 
template<class T , typename = std::enable_if_t<Util::has_SourceInfo_v<T> && !std::is_pointer_v<T>>, class... Args>
void warn (const int kind, const char *format, const T &node, Args &&...args)
 The const ref variant of the above.
 
template<class T , typename = std::enable_if_t<Util::has_SourceInfo_v<T>>, class... Args>
void warn (const int kind, const char *format, const T *node, Args &&...args)
 
bool warning_enabled (int warning_kind) const
 

Additional Inherited Members

- Public Types inherited from P4::Visitor
typedef Visitor_Context Context
 
- Static Public Member Functions inherited from P4::Visitor
static cstring demangle (const char *)
 
static bool warning_enabled (const Visitor *visitor, int warning_kind)
 
- Public Attributes inherited from P4::Visitor
const Visitorcalled_by = nullptr
 
cstring internalName
 
SplitFlowVisit_base *& split_link
 
SplitFlowVisit_basesplit_link_mem = nullptr
 
- Protected Member Functions inherited from P4::Transform
const IR::Nodetransform_child (const IR::Node *child)
 
- Protected Member Functions inherited from P4::Visitor
virtual void init_join_flows (const IR::Node *)
 
virtual bool join_flows (const IR::Node *)
 
virtual void post_join_flows (const IR::Node *, const IR::Node *)
 
void visit_children (const IR::Node *, std::function< void()> fn)
 
- Protected Attributes inherited from P4::Transform
bool forceClone = false
 
- Protected Attributes inherited from P4::Visitor
bool dontForwardChildrenBeforePreorder = false
 
bool joinFlows = false
 
bool visitDagOnce = true
 

Detailed Description

This pass flattens any nested struct inside a P4 header. This pass will fail if a header with nested fields is used as a left-value.

Should be run before the flattenInterfaceStructs pass.

For example, see the data structures below.

struct alt_t { bit<1> valid; bit<7> port; };

struct row_t { alt_t alt0; alt_t alt1; };

header bitvec_hdr { row_t row; }

struct col_t { bitvec_hdr bvh; }

struct local_metadata_t { row_t row0; row_t row1; col_t col; bitvec_hdr bvh0; bitvec_hdr bvh1; };

The flattened data structures are shown below.

struct alt_t { bit<1> valid; bit<7> port; }

struct row_t { alt_t alt0; alt_t alt1; }

header bitvec_hdr { bit<1> _row_alt0_valid0; bit<7> _row_alt0_port1; bit<1> _row_alt1_valid2; bit<7> _row_alt1_port3; }

struct col_t { bitvec_hdr bvh; }

struct local_metadata_t { bit<1> _row0_alt0_valid0; bit<7> _row0_alt0_port1; bit<1> _row0_alt1_valid2; bit<7> _row0_alt1_port3; bit<1> _row1_alt0_valid4; bit<7> _row1_alt0_port5; bit<1> _row1_alt1_valid6; bit<7> _row1_alt1_port7; bitvec_hdr _col_bvh8; bitvec_hdr _bvh09; bitvec_hdr _bvh110; }