proc: extend macOS workaround to amd64

Go change 064f34f (which exists in Go 1.19.2 and following) removed the
pagezero_size option from linker calls (because it is deprecated). This
expanded the problem that exists on darwin/arm64 as well as PIE builds
on darwin/amd64 to all darwin/amd64 builds.

This problem is described on: golang/go#25841.

This commit extends the darwin/arm64 workaround to darwin/amd64.

Fixes go-delve#3194

Author: aarzilli

_fixtures/issue3194.go

@@ -0,0 +1,17 @@
+package main
+
+/*
+#cgo LDFLAGS: -framework CoreFoundation
+#cgo LDFLAGS: -framework CFNetwork
+#include <CFNetwork/CFProxySupport.h>
+*/
+import "C"
+import "fmt"
+
+func main() {
+	f() // break here
+}
+
+func f() {
+	fmt.Println("ok")
+}

pkg/proc/bininfo.go

@@ -1804,8 +1804,7 @@ func (bi *BinaryInfo) parseDebugFrameMacho(image *Image, exe *macho.File, debugI
 //
 // [golang/go#25841]: https://github.com/golang/go/issues/25841
 func (bi *BinaryInfo) macOSDebugFrameBugWorkaround() {
-	//TODO: log extensively because of bugs in the field
-	if bi.GOOS != "darwin" || bi.Arch.Name != "arm64" {
+	if bi.GOOS != "darwin" {
 		return
 	}
 	if len(bi.Images) > 1 {
@@ -1818,9 +1817,28 @@ func (bi *BinaryInfo) macOSDebugFrameBugWorkaround() {
 	if !ok {
 		return
 	}
-	if exe.Flags&macho.FlagPIE == 0 {
-		bi.logger.Infof("debug_frame workaround not needed: not a PIE (%#x)", exe.Flags)
-		return
+	if bi.Arch.Name == "arm64" {
+		if exe.Flags&macho.FlagPIE == 0 {
+			bi.logger.Infof("debug_frame workaround not needed: not a PIE (%#x)", exe.Flags)
+			return
+		}
+	} else {
+		prod := goversion.ParseProducer(bi.Producer())
+		if !prod.AfterOrEqual(goversion.GoVersion{1, 19, 3, 0, 0, ""}) {
+			bi.logger.Infof("debug_frame workaround not needed (version %q on %s)", bi.Producer(), bi.Arch.Name)
+			return
+		}
+		found := false
+		for i := range bi.frameEntries {
+			if bi.frameEntries[i].CIE.CIE_id == ^uint32(0) && bi.frameEntries[i].Begin() < 0x4000000 {
+				found = true
+				break
+			}
+		}
+		if !found {
+			bi.logger.Infof("debug_frame workaround not needed (all FDEs above 0x4000000)")
+			return
+		}
 	}
 
 	// Find first Go function (first = lowest entry point)

pkg/proc/proc_test.go

@@ -6009,3 +6009,18 @@ func TestGnuDebuglink(t *testing.T) {
 		}
 	}
 }
+
+func TestStacktraceExtlink(t *testing.T) {
+	// Tests stacktrace for programs built using external linker.
+	// See issue #3194
+	withTestProcess("issue3194", t, func(p *proc.Target, fixture protest.Fixture) {
+		setFunctionBreakpoint(p, t, "main.main")
+		assertNoError(p.Continue(), t, "First Continue()")
+		frames, err := proc.ThreadStacktrace(p.CurrentThread(), 10)
+		assertNoError(err, t, "ThreadStacktrace")
+		logStacktrace(t, p, frames)
+		if len(frames) < 2 || frames[0].Call.Fn.Name != "main.main" || frames[1].Call.Fn.Name != "runtime.main" {
+			t.Fatalf("bad stacktrace")
+		}
+	})
+}