bp2build: support strip properties.

This CL adds support to bp2build for generating all strip-related
properties into a strip dictionary as a parameter in the cc_library
macro.

With the dictionary, it's easy to organize related attributes and
directly expand into a stripped_shared_library's attributes.

Test: //build/bazel/tests/bionic:compare_libc_stripping
Test: TH
Fixes: b/187928597
Change-Id: Ifea68d48fe295e71a43b12876cb168c475a62187

5 files changed, 238 insertions, 7 deletions

diff --git a/bp2build/build_conversion.go b/bp2build/build_conversion.go
index 4de5aae18..a1e04248e 100644
--- a/bp2build/build_conversion.go
+++ b/bp2build/build_conversion.go
@@ -488,6 +488,9 @@ func prettyPrint(propertyValue reflect.Value, indent int) (string, error) {
 		ret = "{\n"
 		// Sort and print the struct props by the key.
 		structProps := extractStructProperties(propertyValue, indent)
+		if len(structProps) == 0 {
+			return "", nil
+		}
 		for _, k := range android.SortedStringKeys(structProps) {
 			ret += makeIndent(indent + 1)
 			ret += fmt.Sprintf("%q: %s,\n", k, structProps[k])
diff --git a/bp2build/cc_library_conversion_test.go b/bp2build/cc_library_conversion_test.go
index c464cec87..f18825193 100644
--- a/bp2build/cc_library_conversion_test.go
+++ b/bp2build/cc_library_conversion_test.go
@@ -1231,3 +1231,173 @@ cc_library {
     }),
 )`}})
 }
+
+func TestCcLibraryStrip(t *testing.T) {
+	runCcLibraryTestCase(t, bp2buildTestCase{
+		description:                        "cc_library strip args",
+		moduleTypeUnderTest:                "cc_library",
+		moduleTypeUnderTestFactory:         cc.LibraryFactory,
+		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		depsMutators:                       []android.RegisterMutatorFunc{cc.RegisterDepsBp2Build},
+		dir:                                "foo/bar",
+		filesystem: map[string]string{
+			"foo/bar/Android.bp": `
+cc_library {
+    name: "nothing",
+    bazel_module: { bp2build_available: true },
+}
+cc_library {
+    name: "keep_symbols",
+    bazel_module: { bp2build_available: true },
+    strip: {
+		keep_symbols: true,
+	}
+}
+cc_library {
+    name: "keep_symbols_and_debug_frame",
+    bazel_module: { bp2build_available: true },
+    strip: {
+		keep_symbols_and_debug_frame: true,
+	}
+}
+cc_library {
+    name: "none",
+    bazel_module: { bp2build_available: true },
+    strip: {
+		none: true,
+	}
+}
+cc_library {
+    name: "keep_symbols_list",
+    bazel_module: { bp2build_available: true },
+    strip: {
+		keep_symbols_list: ["symbol"],
+	}
+}
+cc_library {
+    name: "all",
+    bazel_module: { bp2build_available: true },
+    strip: {
+		all: true,
+	}
+}
+`,
+		},
+		blueprint: soongCcLibraryPreamble,
+		expectedBazelTargets: []string{`cc_library(
+    name = "all",
+    copts = [
+        "-Ifoo/bar",
+        "-I$(BINDIR)/foo/bar",
+    ],
+    strip = {
+        "all": True,
+    },
+)`, `cc_library(
+    name = "keep_symbols",
+    copts = [
+        "-Ifoo/bar",
+        "-I$(BINDIR)/foo/bar",
+    ],
+    strip = {
+        "keep_symbols": True,
+    },
+)`, `cc_library(
+    name = "keep_symbols_and_debug_frame",
+    copts = [
+        "-Ifoo/bar",
+        "-I$(BINDIR)/foo/bar",
+    ],
+    strip = {
+        "keep_symbols_and_debug_frame": True,
+    },
+)`, `cc_library(
+    name = "keep_symbols_list",
+    copts = [
+        "-Ifoo/bar",
+        "-I$(BINDIR)/foo/bar",
+    ],
+    strip = {
+        "keep_symbols_list": ["symbol"],
+    },
+)`, `cc_library(
+    name = "none",
+    copts = [
+        "-Ifoo/bar",
+        "-I$(BINDIR)/foo/bar",
+    ],
+    strip = {
+        "none": True,
+    },
+)`, `cc_library(
+    name = "nothing",
+    copts = [
+        "-Ifoo/bar",
+        "-I$(BINDIR)/foo/bar",
+    ],
+)`},
+	})
+}
+
+func TestCcLibraryStripWithArch(t *testing.T) {
+	runCcLibraryTestCase(t, bp2buildTestCase{
+		description:                        "cc_library strip args",
+		moduleTypeUnderTest:                "cc_library",
+		moduleTypeUnderTestFactory:         cc.LibraryFactory,
+		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		depsMutators:                       []android.RegisterMutatorFunc{cc.RegisterDepsBp2Build},
+		dir:                                "foo/bar",
+		filesystem: map[string]string{
+			"foo/bar/Android.bp": `
+cc_library {
+    name: "multi-arch",
+    bazel_module: { bp2build_available: true },
+    target: {
+        darwin: {
+            strip: {
+                keep_symbols_list: ["foo", "bar"]
+            }
+        },
+    },
+    arch: {
+        arm: {
+            strip: {
+                keep_symbols_and_debug_frame: true,
+            },
+        },
+        arm64: {
+            strip: {
+                keep_symbols: true,
+            },
+        },
+    }
+}
+`,
+		},
+		blueprint: soongCcLibraryPreamble,
+		expectedBazelTargets: []string{`cc_library(
+    name = "multi-arch",
+    copts = [
+        "-Ifoo/bar",
+        "-I$(BINDIR)/foo/bar",
+    ],
+    strip = {
+        "keep_symbols": select({
+            "//build/bazel/platforms/arch:arm64": True,
+            "//conditions:default": None,
+        }),
+        "keep_symbols_and_debug_frame": select({
+            "//build/bazel/platforms/arch:arm": True,
+            "//conditions:default": None,
+        }),
+        "keep_symbols_list": select({
+            "//build/bazel/platforms/os:darwin": [
+                "foo",
+                "bar",
+            ],
+            "//conditions:default": [],
+        }),
+    },
+)`},
+	})
+}
diff --git a/cc/bp2build.go b/cc/bp2build.go
index 211fe5e05..5357668e5 100644
--- a/cc/bp2build.go
+++ b/cc/bp2build.go
@@ -485,13 +485,18 @@ func bp2BuildParseCompilerProps(ctx android.TopDownMutatorContext, module *Modul
 
 // Convenience struct to hold all attributes parsed from linker properties.
 type linkerAttributes struct {
-	deps             bazel.LabelListAttribute
-	dynamicDeps      bazel.LabelListAttribute
-	wholeArchiveDeps bazel.LabelListAttribute
-	exportedDeps     bazel.LabelListAttribute
-	useLibcrt        bazel.BoolAttribute
-	linkopts         bazel.StringListAttribute
-	versionScript    bazel.LabelAttribute
+	deps                          bazel.LabelListAttribute
+	dynamicDeps                   bazel.LabelListAttribute
+	wholeArchiveDeps              bazel.LabelListAttribute
+	exportedDeps                  bazel.LabelListAttribute
+	useLibcrt                     bazel.BoolAttribute
+	linkopts                      bazel.StringListAttribute
+	versionScript                 bazel.LabelAttribute
+	stripKeepSymbols              bazel.BoolAttribute
+	stripKeepSymbolsAndDebugFrame bazel.BoolAttribute
+	stripKeepSymbolsList          bazel.StringListAttribute
+	stripAll                      bazel.BoolAttribute
+	stripNone                     bazel.BoolAttribute
 }
 
 // FIXME(b/187655838): Use the existing linkerFlags() function instead of duplicating logic here
@@ -515,6 +520,33 @@ func bp2BuildParseLinkerProps(ctx android.TopDownMutatorContext, module *Module)
 	var versionScript bazel.LabelAttribute
 	var useLibcrt bazel.BoolAttribute
 
+	var stripKeepSymbols bazel.BoolAttribute
+	var stripKeepSymbolsAndDebugFrame bazel.BoolAttribute
+	var stripKeepSymbolsList bazel.StringListAttribute
+	var stripAll bazel.BoolAttribute
+	var stripNone bazel.BoolAttribute
+
+	if libraryDecorator, ok := module.linker.(*libraryDecorator); ok {
+		stripProperties := libraryDecorator.stripper.StripProperties
+		stripKeepSymbols.Value = stripProperties.Strip.Keep_symbols
+		stripKeepSymbolsList.Value = stripProperties.Strip.Keep_symbols_list
+		stripKeepSymbolsAndDebugFrame.Value = stripProperties.Strip.Keep_symbols_and_debug_frame
+		stripAll.Value = stripProperties.Strip.All
+		stripNone.Value = stripProperties.Strip.None
+	}
+
+	for axis, configToProps := range module.GetArchVariantProperties(ctx, &StripProperties{}) {
+		for config, props := range configToProps {
+			if stripProperties, ok := props.(*StripProperties); ok {
+				stripKeepSymbols.SetSelectValue(axis, config, stripProperties.Strip.Keep_symbols)
+				stripKeepSymbolsList.SetSelectValue(axis, config, stripProperties.Strip.Keep_symbols_list)
+				stripKeepSymbolsAndDebugFrame.SetSelectValue(axis, config, stripProperties.Strip.Keep_symbols_and_debug_frame)
+				stripAll.SetSelectValue(axis, config, stripProperties.Strip.All)
+				stripNone.SetSelectValue(axis, config, stripProperties.Strip.None)
+			}
+		}
+	}
+
 	for _, linkerProps := range module.linker.linkerProps() {
 		if baseLinkerProps, ok := linkerProps.(*BaseLinkerProperties); ok {
 			// Excludes to parallel Soong:
@@ -630,6 +662,13 @@ func bp2BuildParseLinkerProps(ctx android.TopDownMutatorContext, module *Module)
 		linkopts:         linkopts,
 		useLibcrt:        useLibcrt,
 		versionScript:    versionScript,
+
+		// Strip properties
+		stripKeepSymbols:              stripKeepSymbols,
+		stripKeepSymbolsAndDebugFrame: stripKeepSymbolsAndDebugFrame,
+		stripKeepSymbolsList:          stripKeepSymbolsList,
+		stripAll:                      stripAll,
+		stripNone:                     stripNone,
 	}
 }
 
diff --git a/cc/library.go b/cc/library.go
index 93bd56c6f..28605f5c4 100644
--- a/cc/library.go
+++ b/cc/library.go
@@ -259,6 +259,16 @@ type bazelCcLibraryAttributes struct {
 	Static_deps_for_static        bazel.LabelListAttribute
 	Dynamic_deps_for_static       bazel.LabelListAttribute
 	Whole_archive_deps_for_static bazel.LabelListAttribute
+
+	Strip stripAttributes
+}
+
+type stripAttributes struct {
+	Keep_symbols                 bazel.BoolAttribute
+	Keep_symbols_and_debug_frame bazel.BoolAttribute
+	Keep_symbols_list            bazel.StringListAttribute
+	All                          bazel.BoolAttribute
+	None                         bazel.BoolAttribute
 }
 
 type bazelCcLibrary struct {
@@ -323,6 +333,14 @@ func CcLibraryBp2Build(ctx android.TopDownMutatorContext) {
 		Linkopts:            linkerAttrs.linkopts,
 		Use_libcrt:          linkerAttrs.useLibcrt,
 
+		Strip: stripAttributes{
+			Keep_symbols:                 linkerAttrs.stripKeepSymbols,
+			Keep_symbols_and_debug_frame: linkerAttrs.stripKeepSymbolsAndDebugFrame,
+			Keep_symbols_list:            linkerAttrs.stripKeepSymbolsList,
+			All:                          linkerAttrs.stripAll,
+			None:                         linkerAttrs.stripNone,
+		},
+
 		Shared_srcs:                   sharedAttrs.srcs,
 		Shared_srcs_c:                 sharedAttrs.srcs_c,
 		Shared_srcs_as:                sharedAttrs.srcs_as,
diff --git a/cc/strip.go b/cc/strip.go
index b1f34bb89..c60e13530 100644
--- a/cc/strip.go
+++ b/cc/strip.go
@@ -59,6 +59,7 @@ func (stripper *Stripper) NeedsStrip(actx android.ModuleContext) bool {
 	return !forceDisable && (forceEnable || defaultEnable)
 }
 
+// Keep this consistent with //build/bazel/rules/stripped_shared_library.bzl.
 func (stripper *Stripper) strip(actx android.ModuleContext, in android.Path, out android.ModuleOutPath,
 	flags StripFlags, isStaticLib bool) {
 	if actx.Darwin() {