ocaml-base-compiler

Official release 4.12.1
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Library ocamlmiddleend
type t

Environments follow the lexical scopes of the program.

val create : never_inline:bool -> backend:(module Backend_intf.S) -> round:int -> ppf_dump:Format.formatter -> t

Create a new environment. If never_inline is true then the returned environment will prevent Inline_and_simplify from inlining. The backend parameter is used for passing information about the compiler backend being used. Newly-created environments have inactive Freshenings (see below) and do not initially hold any approximation information.

val backend : t -> (module Backend_intf.S)

Obtain the first-class module that gives information about the compiler backend being used for compilation.

val really_import_approx : t -> Simple_value_approx.t -> Simple_value_approx.t

Obtain the really_import_approx function from the backend module.

val round : t -> int

Which simplification round we are currently in.

val ppf_dump : t -> Format.formatter

Where to print intermediate asts and similar debug information

val add : t -> Variable.t -> Simple_value_approx.t -> t

Add the approximation of a variable---that is to say, some knowledge about the value(s) the variable may take on at runtime---to the environment.

val add_outer_scope : t -> Variable.t -> Simple_value_approx.t -> t
val add_mutable : t -> Mutable_variable.t -> Simple_value_approx.t -> t

Like add, but for mutable variables.

val find_exn : t -> Variable.t -> Simple_value_approx.t

Find the approximation of a given variable, raising a fatal error if the environment does not know about the variable. Use find_opt instead if you need to catch the failure case.

val find_mutable_exn : t -> Mutable_variable.t -> Simple_value_approx.t

Like find_exn, but for mutable variables.

type scope =
| Current
| Outer
val find_with_scope_exn : t -> Variable.t -> scope * Simple_value_approx.t
val find_opt : t -> Variable.t -> Simple_value_approx.t option

Like find_exn, but intended for use where the "not present in environment" case is to be handled by the caller.

val find_list_exn : t -> Variable.t list -> Simple_value_approx.t list

Like find_exn, but for a list of variables.

val does_not_bind : t -> Variable.t list -> bool
val does_not_freshen : t -> Variable.t list -> bool
val add_symbol : t -> Symbol.t -> Simple_value_approx.t -> t
val redefine_symbol : t -> Symbol.t -> Simple_value_approx.t -> t
val find_symbol_exn : t -> Symbol.t -> Simple_value_approx.t
val find_symbol_opt : t -> Symbol.t -> Simple_value_approx.t option
val find_symbol_fatal : t -> Symbol.t -> Simple_value_approx.t
val find_or_load_symbol : t -> Symbol.t -> Simple_value_approx.t
val add_projection : t -> projection:Projection.t -> bound_to:Variable.t -> t

Note that the given bound_to holds the given projection.

val find_projection : t -> projection:Projection.t -> Variable.t option

Determine if the environment knows about a variable that is bound to the given projection.

val mem : t -> Variable.t -> bool

Whether the environment has an approximation for the given variable.

val freshening : t -> Freshening.t

Return the freshening that should be applied to variables when rewriting code (in Inline_and_simplify, etc.) using the given environment.

val set_freshening : t -> Freshening.t -> t

Set the freshening that should be used as per freshening, above.

val activate_freshening : t -> t

Causes every bound variable in code rewritten during inlining and simplification, using the given environment, to be freshened. This is used when descending into subexpressions substituted into existing expressions.

val local : t -> t

Erase all variable approximation information and freshening information from the given environment. However, the freshening activation state is preserved. This function is used when rewriting inside a function declaration, to avoid (due to a compiler bug) accidental use of variables from outer scopes that are not accessible.

val inside_set_of_closures_declaration : Set_of_closures_origin.t -> t -> bool

Determine whether the inliner is currently inside a function body from the given set of closures. This is used to detect whether a given function call refers to a function which exists somewhere on the current inlining stack.

val at_toplevel : t -> bool

Not inside a closure declaration. Toplevel code is the one evaluated when the compilation unit is loaded

val is_inside_branch : t -> bool
val branch_depth : t -> int
val inside_branch : t -> t
val increase_closure_depth : t -> t
val set_never_inline : t -> t

Mark that call sites contained within code rewritten using the given environment should never be replaced by inlined (or unrolled) versions of the callee(s).

val set_never_inline_inside_closures : t -> t

Equivalent to set_never_inline but only applies to code inside a set of closures.

val unset_never_inline_inside_closures : t -> t

Unset the restriction from set_never_inline_inside_closures

val set_never_inline_outside_closures : t -> t

Equivalent to set_never_inline but does not apply to code inside a set of closures.

val unset_never_inline_outside_closures : t -> t

Unset the restriction from set_never_inline_outside_closures

val never_inline : t -> bool

Return whether set_never_inline is currently in effect on the given environment.

val inlining_level : t -> int
val inlining_level_up : t -> t

Mark that this environment is used to rewrite code for inlining. This is used by the inlining heuristics to decide whether to continue. Unconditionally inlined does not take this into account.

val actively_unrolling : t -> Set_of_closures_origin.t -> int option

Whether we are actively unrolling a given function.

val start_actively_unrolling : t -> Set_of_closures_origin.t -> int -> t

Start actively unrolling a given function n times.

val continue_actively_unrolling : t -> Set_of_closures_origin.t -> t

Unroll a function currently actively being unrolled.

val unrolling_allowed : t -> Set_of_closures_origin.t -> bool

Whether it is permissible to unroll a call to a recursive function in the given environment.

val inside_unrolled_function : t -> Set_of_closures_origin.t -> t

Whether the given environment is currently being used to rewrite the body of an unrolled recursive function.

val inlining_allowed : t -> Closure_origin.t -> bool

Whether it is permissible to inline a call to a function in the given environment.

val inside_inlined_function : t -> Closure_origin.t -> t

Whether the given environment is currently being used to rewrite the body of an inlined function.

val note_entering_closure : t -> closure_id:Closure_id.t -> dbg:Debuginfo.t -> t

If collecting inlining statistics, record that the inliner is about to descend into closure_id. This information enables us to produce a stack of closures that form a kind of context around an inlining decision point.

val note_entering_call : t -> closure_id:Closure_id.t -> dbg:Debuginfo.t -> t

If collecting inlining statistics, record that the inliner is about to descend into a call to closure_id. This information enables us to produce a stack of closures that form a kind of context around an inlining decision point.

val note_entering_inlined : t -> t

If collecting inlining statistics, record that the inliner is about to descend into an inlined function call. This requires that the inliner has already entered the call with note_entering_call.

val note_entering_specialised : t -> closure_ids:Closure_id.Set.t -> t

If collecting inlining statistics, record that the inliner is about to descend into a specialised function definition. This requires that the inliner has already entered the call with note_entering_call.

val enter_closure : t -> closure_id:Closure_id.t -> inline_inside:bool -> dbg:Debuginfo.t -> f:( t -> 'a ) -> 'a

Update a given environment to record that the inliner is about to descend into closure_id and pass the resulting environment to f. If inline_inside is false then the environment passed to f will be marked as never_inline (see above).

val record_decision : t -> Inlining_stats_types.Decision.t -> unit

If collecting inlining statistics, record an inlining decision for the call at the top of the closure stack stored inside the given environment.

val print : Format.formatter -> t -> unit

Print a human-readable version of the given environment.

val set_inline_debuginfo : t -> dbg:Debuginfo.t -> t

The environment stores the call-site being inlined to produce precise location information. This function sets the current call-site being inlined.

val add_inlined_debuginfo : t -> dbg:Debuginfo.t -> Debuginfo.t

Appends the locations of inlined call-sites to the ~dbg argument