Documentation
¶
Overview ¶
Package devirtualize implements two "devirtualization" optimization passes:
- "Static" devirtualization which replaces interface method calls with direct concrete-type method calls where possible.
- "Profile-guided" devirtualization which replaces indirect calls with a conditional direct call to the hottest concrete callee from a profile, as well as a fallback using the original indirect call.
Index ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func ProfileGuided ¶
ProfileGuided performs call devirtualization of indirect calls based on profile information.
Specifically, it performs conditional devirtualization of interface calls for the hottest callee. That is, it performs a transformation like:
type Iface interface {
Foo()
}
type Concrete struct{}
func (Concrete) Foo() {}
func foo(i Iface) {
i.Foo()
}
to:
func foo(i Iface) {
if c, ok := i.(Concrete); ok {
c.Foo()
} else {
i.Foo()
}
}
The primary benefit of this transformation is enabling inlining of the direct call.
Types ¶
type CallStat ¶
type CallStat struct {
Pkg string // base.Ctxt.Pkgpath
Pos string // file:line:col of call.
Caller string // Linker symbol name of calling function.
// Direct or indirect call.
Direct bool
// For indirect calls, interface call or other indirect function call.
Interface bool
// Total edge weight from this call site.
Weight int64
// Hottest callee from this call site, regardless of type
// compatibility.
Hottest string
HottestWeight int64
// Devirtualized callee if != "".
//
// Note that this may be different than Hottest because we apply
// type-check restrictions, which helps distinguish multiple calls on
// the same line.
Devirtualized string
DevirtualizedWeight int64
}
CallStat summarizes a single call site.
This is used only for debug logging.
Source Files
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