dap: fill in breakpoint reason for being unverified

dap/adapter.go

@@ -589,6 +589,7 @@ func (b *breakpointMap) Set(fname string, sbps []dap.SourceBreakpoint) (breakpoi
 				EndLine:   sbp.Line,
 				Column:    sbp.Column,
 				EndColumn: sbp.Column,
+				Reason:    "pending",
 			}
 		}
 		breakpoints = append(breakpoints, bp)
@@ -608,6 +609,27 @@ func (b *breakpointMap) Intersect(ctx Context, src *pb.Source, ws string) map[di
 			digests[digest.Digest(dgst)] = id
 		}
 	}
+
+	// Mark unverified breakpoints as failed at this point since we couldn't find an area
+	// in the source where they applied.
+	for _, info := range src.Infos {
+		fname := filepath.Join(ws, info.Filename)
+
+		bps := b.byPath[fname]
+		for _, bp := range bps {
+			if !bp.Verified && bp.Reason != "failed" {
+				bp.Reason = "failed"
+
+				ctx.C() <- &dap.BreakpointEvent{
+					Event: dap.Event{Event: "breakpoint"},
+					Body: dap.BreakpointEventBody{
+						Reason:     "changed",
+						Breakpoint: bp,
+					},
+				}
+			}
+		}
+	}
 	return digests
 }
 
@@ -651,6 +673,7 @@ func (b *breakpointMap) intersect(ctx Context, src *pb.Source, locs *pb.Location
 				bp.Column = int(r.Start.Character)
 				bp.EndColumn = int(r.End.Character)
 				bp.Verified = true
+				bp.Reason = ""
 
 				ctx.C() <- &dap.BreakpointEvent{
 					Event: dap.Event{Event: "breakpoint"},

go.mod

@@ -21,7 +21,7 @@ require (
 	github.com/docker/docker v28.5.2+incompatible
 	github.com/docker/go-units v0.5.0
 	github.com/gofrs/flock v0.13.0
-	github.com/google/go-dap v0.12.0
+	github.com/google/go-dap v0.12.1-0.20250904181021-d7a2259b058b
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510
 	github.com/google/uuid v1.6.0
 	github.com/hashicorp/go-cty-funcs v0.0.0-20250818135842-6aab67130928

go.sum

@@ -155,8 +155,8 @@ github.com/google/gnostic-models v0.7.0 h1:qwTtogB15McXDaNqTZdzPJRHvaVJlAl+HVQnL
 github.com/google/gnostic-models v0.7.0/go.mod h1:whL5G0m6dmc5cPxKc5bdKdEN3UjI7OUGxBlw57miDrQ=
 github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
 github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
-github.com/google/go-dap v0.12.0 h1:rVcjv3SyMIrpaOoTAdFDyHs99CwVOItIJGKLQFQhNeM=
-github.com/google/go-dap v0.12.0/go.mod h1:tNjCASCm5cqePi/RVXXWEVqtnNLV1KTWtYOqu6rZNzc=
+github.com/google/go-dap v0.12.1-0.20250904181021-d7a2259b058b h1:m+yLjBIoXaMKk6pwd1IJYYgM76+mwcy7J9+cuY7LqmQ=
+github.com/google/go-dap v0.12.1-0.20250904181021-d7a2259b058b/go.mod h1:tNjCASCm5cqePi/RVXXWEVqtnNLV1KTWtYOqu6rZNzc=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/pprof v0.0.0-20250820193118-f64d9cf942d6 h1:EEHtgt9IwisQ2AZ4pIsMjahcegHh6rmhqxzIRQIyepY=
 github.com/google/pprof v0.0.0-20250820193118-f64d9cf942d6/go.mod h1:I6V7YzU0XDpsHqbsyrghnFZLO1gwK6NPTNvmetQIk9U=

tests/dap_build.go

@@ -77,6 +77,7 @@ var dapBuildTests = []func(t *testing.T, sb integration.Sandbox){
 	testDapBuild,
 	testDapBuildStopOnEntry,
 	testDapBuildSetBreakpoints,
+	testDapBuildVerifiedBreakpoints,
 	testDapBuildStepIn,
 	testDapBuildStepNext,
 	testDapBuildStepOut,
@@ -199,6 +200,56 @@ func testDapBuildSetBreakpoints(t *testing.T, sb integration.Sandbox) {
 	require.NoError(t, done(false))
 }
 
+func testDapBuildVerifiedBreakpoints(t *testing.T, sb integration.Sandbox) {
+	dir := createTestProject(t)
+	client, done, err := dapBuildCmd(t, sb, withArgs(dir))
+	require.NoError(t, err)
+
+	interruptCh := pollInterruptEvents(client)
+
+	var actual []dap.BreakpointEventBody
+	client.RegisterEvent("breakpoint", func(em dap.EventMessage) {
+		e := em.(*dap.BreakpointEvent)
+		actual = append(actual, e.Body)
+	})
+
+	doLaunch(t, client, commands.LaunchConfig{
+		Dockerfile:  path.Join(dir, "Dockerfile"),
+		ContextPath: dir,
+	},
+		dap.SourceBreakpoint{Line: 2},
+		dap.SourceBreakpoint{Line: 10},
+	)
+
+	stopped := waitForInterrupt[*dap.StoppedEvent](t, interruptCh)
+	require.NotNil(t, stopped)
+
+	assert.Equal(t, []dap.BreakpointEventBody{
+		{
+			Reason: "changed",
+			Breakpoint: dap.Breakpoint{
+				Id:       1,
+				Line:     2,
+				EndLine:  2,
+				Verified: true,
+			},
+		},
+		{
+			Reason: "changed",
+			Breakpoint: dap.Breakpoint{
+				Id:       2,
+				Line:     10,
+				EndLine:  10,
+				Verified: false,
+				Reason:   "failed",
+			},
+		},
+	}, actual)
+
+	var exitErr *exec.ExitError
+	require.ErrorAs(t, done(true), &exitErr)
+}
+
 func testDapBuildStepIn(t *testing.T, sb integration.Sandbox) {
 	dir := createTestProject(t)
 	client, done, err := dapBuildCmd(t, sb, withArgs(dir))