[dev.typeparams] runtime/pprof: replace funcPC with internal/abi.FuncPCABIInternal

All funcPC references are ABIInternal functions. Replace with the
intrinsics.

Change-Id: I2266bb6d2b713eb63b6a09846e9f9c423cab6e9b
Reviewed-on: https://go-review.googlesource.com/c/go/+/322349
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

src/runtime/pprof/pprof.go

@@ -76,6 +76,7 @@ import (
 	"bufio"
 	"bytes"
 	"fmt"
+	"internal/abi"
 	"io"
 	"runtime"
 	"sort"
@@ -289,7 +290,7 @@ func (p *Profile) Add(value interface{}, skip int) {
 	stk = stk[:n]
 	if len(stk) == 0 {
 		// The value for skip is too large, and there's no stack trace to record.
-		stk = []uintptr{funcPC(lostProfileEvent)}
+		stk = []uintptr{abi.FuncPCABIInternal(lostProfileEvent)}
 	}
 
 	p.mu.Lock()

src/runtime/pprof/pprof_test.go

@@ -11,6 +11,7 @@ import (
 	"bytes"
 	"context"
 	"fmt"
+	"internal/abi"
 	"internal/profile"
 	"internal/testenv"
 	"io"
@@ -116,7 +117,7 @@ func containsInlinedCall(f interface{}, maxBytes int) bool {
 // findInlinedCall returns the PC of an inlined function call within
 // the function body for the function f if any.
 func findInlinedCall(f interface{}, maxBytes int) (pc uint64, found bool) {
-	fFunc := runtime.FuncForPC(uintptr(funcPC(f)))
+	fFunc := runtime.FuncForPC(uintptr(abi.FuncPCABIInternal(f)))
 	if fFunc == nil || fFunc.Entry() == 0 {
 		panic("failed to locate function entry")
 	}

src/runtime/pprof/proto.go

@@ -8,6 +8,7 @@ import (
 	"bytes"
 	"compress/gzip"
 	"fmt"
+	"internal/abi"
 	"io"
 	"os"
 	"runtime"
@@ -21,11 +22,6 @@ import (
 // (The name shows up in the pprof graphs.)
 func lostProfileEvent() { lostProfileEvent() }
 
-// funcPC returns the PC for the func value f.
-func funcPC(f interface{}) uintptr {
-	return *(*[2]*uintptr)(unsafe.Pointer(&f))[1]
-}
-
 // A profileBuilder writes a profile incrementally from a
 // stream of profile samples delivered by the runtime.
 type profileBuilder struct {
@@ -325,7 +321,7 @@ func (b *profileBuilder) addCPUData(data []uint64, tags []unsafe.Pointer) error
 				// gentraceback guarantees that PCs in the
 				// stack can be unconditionally decremented and
 				// still be valid, so we must do the same.
-				uint64(funcPC(lostProfileEvent) + 1),
+				uint64(abi.FuncPCABIInternal(lostProfileEvent) + 1),
 			}
 		}
 		b.m.lookup(stk, tag).count += int64(count)

src/runtime/pprof/proto_test.go

@@ -8,6 +8,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
+	"internal/abi"
 	"internal/profile"
 	"internal/testenv"
 	"os"
@@ -97,11 +98,11 @@ func testPCs(t *testing.T) (addr1, addr2 uint64, map1, map2 *profile.Mapping) {
 		map2 = mprof.Mapping[1]
 		map2.BuildID, _ = elfBuildID(map2.File)
 	case "js":
-		addr1 = uint64(funcPC(f1))
-		addr2 = uint64(funcPC(f2))
+		addr1 = uint64(abi.FuncPCABIInternal(f1))
+		addr2 = uint64(abi.FuncPCABIInternal(f2))
 	default:
-		addr1 = uint64(funcPC(f1))
-		addr2 = uint64(funcPC(f2))
+		addr1 = uint64(abi.FuncPCABIInternal(f1))
+		addr2 = uint64(abi.FuncPCABIInternal(f2))
 		// Fake mapping - HasFunctions will be true because two PCs from Go
 		// will be fully symbolized.
 		fake := &profile.Mapping{ID: 1, HasFunctions: true}