Handle product config vars in bp2build.

Test: bp2build ci  & mixed build libc
Bug: 183595873
Change-Id: I2d87434ff4df5a24efc5e3e38f087de035228934

bazel/properties.go

@@ -19,6 +19,7 @@ import (
 	"path/filepath"
 	"regexp"
 	"sort"
+	"strings"
 )
 
 // BazelTargetModuleProperties contain properties and metadata used for
@@ -200,6 +201,10 @@ const (
 	// config variable default key in an Android.bp file, although there's no
 	// integration with Soong config variables (yet).
 	CONDITIONS_DEFAULT = "conditions_default"
+
+	ConditionsDefaultSelectKey = "//conditions:default"
+
+	productVariableBazelPackage = "//build/bazel/product_variables"
 )
 
 var (
@@ -215,7 +220,7 @@ var (
 		ARCH_ARM64:         "//build/bazel/platforms/arch:arm64",
 		ARCH_X86:           "//build/bazel/platforms/arch:x86",
 		ARCH_X86_64:        "//build/bazel/platforms/arch:x86_64",
-		CONDITIONS_DEFAULT: "//conditions:default", // The default condition of as arch select map.
+		CONDITIONS_DEFAULT: ConditionsDefaultSelectKey, // The default condition of as arch select map.
 	}
 
 	// A map of target operating systems to the Bazel label of the
@@ -227,7 +232,7 @@ var (
 		OS_LINUX:           "//build/bazel/platforms/os:linux",
 		OS_LINUX_BIONIC:    "//build/bazel/platforms/os:linux_bionic",
 		OS_WINDOWS:         "//build/bazel/platforms/os:windows",
-		CONDITIONS_DEFAULT: "//conditions:default", // The default condition of an os select map.
+		CONDITIONS_DEFAULT: ConditionsDefaultSelectKey, // The default condition of an os select map.
 	}
 )
 
@@ -435,6 +440,10 @@ type StringListAttribute struct {
 	// are generated in a select statement and appended to the non-os specific
 	// label list Value.
 	OsValues stringListOsValues
+
+	// list of product-variable string list values. Optional. if used, each will generate a select
+	// statement appended to the label list Value.
+	ProductValues []ProductVariableValues
 }
 
 // MakeStringListAttribute initializes a StringListAttribute with the non-arch specific value.
@@ -466,6 +475,18 @@ type stringListOsValues struct {
 	ConditionsDefault []string
 }
 
+// Product Variable values for StringListAttribute
+type ProductVariableValues struct {
+	ProductVariable string
+
+	Values []string
+}
+
+// SelectKey returns the appropriate select key for the receiving ProductVariableValues.
+func (p ProductVariableValues) SelectKey() string {
+	return fmt.Sprintf("%s:%s", productVariableBazelPackage, strings.ToLower(p.ProductVariable))
+}
+
 // HasConfigurableValues returns true if the attribute contains
 // architecture-specific string_list values.
 func (attrs StringListAttribute) HasConfigurableValues() bool {
@@ -480,7 +501,8 @@ func (attrs StringListAttribute) HasConfigurableValues() bool {
 			return true
 		}
 	}
-	return false
+
+	return len(attrs.ProductValues) > 0
 }
 
 func (attrs *StringListAttribute) archValuePtrs() map[string]*[]string {
@@ -558,6 +580,21 @@ func (attrs *StringListAttribute) Append(other StringListAttribute) {
 		attrs.SetValueForOS(os, this)
 	}
 
+	productValues := make(map[string][]string, 0)
+	for _, pv := range attrs.ProductValues {
+		productValues[pv.ProductVariable] = pv.Values
+	}
+	for _, pv := range other.ProductValues {
+		productValues[pv.ProductVariable] = append(productValues[pv.ProductVariable], pv.Values...)
+	}
+	attrs.ProductValues = make([]ProductVariableValues, 0, len(productValues))
+	for pv, vals := range productValues {
+		attrs.ProductValues = append(attrs.ProductValues, ProductVariableValues{
+			ProductVariable: pv,
+			Values:          vals,
+		})
+	}
+
 	attrs.Value = append(attrs.Value, other.Value...)
 }
 

bp2build/cc_library_static_conversion_test.go

@@ -1156,3 +1156,48 @@ cc_library_static {
 )`},
 	})
 }
+
+func TestCcLibraryStaticProductVariableSelects(t *testing.T) {
+	runCcLibraryStaticTestCase(t, bp2buildTestCase{
+		description:                        "cc_library_static product variable selects",
+		moduleTypeUnderTest:                "cc_library_static",
+		moduleTypeUnderTestFactory:         cc.LibraryStaticFactory,
+		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryStaticBp2Build,
+		depsMutators:                       []android.RegisterMutatorFunc{cc.RegisterDepsBp2Build},
+		filesystem:                         map[string]string{},
+		blueprint: soongCcLibraryStaticPreamble + `
+cc_library_static {
+    name: "foo_static",
+    srcs: ["common.c"],
+    product_variables: {
+      malloc_not_svelte: {
+        cflags: ["-Wmalloc_not_svelte"],
+      },
+      malloc_zero_contents: {
+        cflags: ["-Wmalloc_zero_contents"],
+      },
+      binder32bit: {
+        cflags: ["-Wbinder32bit"],
+      },
+    },
+} `,
+		expectedBazelTargets: []string{`cc_library_static(
+    name = "foo_static",
+    copts = [
+        "-I.",
+        "-I$(BINDIR)/.",
+    ] + select({
+        "//build/bazel/product_variables:malloc_not_svelte": ["-Wmalloc_not_svelte"],
+        "//conditions:default": [],
+    }) + select({
+        "//build/bazel/product_variables:malloc_zero_contents": ["-Wmalloc_zero_contents"],
+        "//conditions:default": [],
+    }) + select({
+        "//build/bazel/product_variables:binder32bit": ["-Wbinder32bit"],
+        "//conditions:default": [],
+    }),
+    linkstatic = True,
+    srcs = ["common.c"],
+)`},
+	})
+}

bp2build/cc_object_conversion_test.go

@@ -208,7 +208,10 @@ func TestCcObjectProductVariable(t *testing.T) {
 `,
 		expectedBazelTargets: []string{`cc_object(
     name = "foo",
-    asflags = ["-DPLATFORM_SDK_VERSION={Platform_sdk_version}"],
+    asflags = select({
+        "//build/bazel/product_variables:platform_sdk_version": ["-DPLATFORM_SDK_VERSION={Platform_sdk_version}"],
+        "//conditions:default": [],
+    }),
     copts = ["-fno-addrsig"],
 )`,
 		},

bp2build/configurability.go

@@ -11,26 +11,42 @@ import (
 
 type selects map[string]reflect.Value
 
-func getStringListValues(list bazel.StringListAttribute) (reflect.Value, selects, selects) {
+func getStringListValues(list bazel.StringListAttribute) (reflect.Value, []selects) {
 	value := reflect.ValueOf(list.Value)
 	if !list.HasConfigurableValues() {
-		return value, nil, nil
+		return value, []selects{}
 	}
 
+	selectValues := make([]selects, 0)
 	archSelects := map[string]reflect.Value{}
 	for arch, selectKey := range bazel.PlatformArchMap {
 		archSelects[selectKey] = reflect.ValueOf(list.GetValueForArch(arch))
 	}
+	if len(archSelects) > 0 {
+		selectValues = append(selectValues, archSelects)
+	}
 
 	osSelects := map[string]reflect.Value{}
 	for os, selectKey := range bazel.PlatformOsMap {
 		osSelects[selectKey] = reflect.ValueOf(list.GetValueForOS(os))
 	}
+	if len(osSelects) > 0 {
+		selectValues = append(selectValues, osSelects)
+	}
 
-	return value, archSelects, osSelects
+	for _, pv := range list.ProductValues {
+		s := make(selects)
+		if len(pv.Values) > 0 {
+			s[pv.SelectKey()] = reflect.ValueOf(pv.Values)
+			s[bazel.ConditionsDefaultSelectKey] = reflect.ValueOf([]string{})
+			selectValues = append(selectValues, s)
+		}
+	}
+
+	return value, selectValues
 }
 
-func getLabelValue(label bazel.LabelAttribute) (reflect.Value, selects, selects) {
+func getLabelValue(label bazel.LabelAttribute) (reflect.Value, []selects) {
 	var value reflect.Value
 	var archSelects selects
 
@@ -43,13 +59,13 @@ func getLabelValue(label bazel.LabelAttribute) (reflect.Value, selects, selects)
 		value = reflect.ValueOf(label.Value)
 	}
 
-	return value, archSelects, nil
+	return value, []selects{archSelects}
 }
 
-func getLabelListValues(list bazel.LabelListAttribute) (reflect.Value, selects, selects) {
+func getLabelListValues(list bazel.LabelListAttribute) (reflect.Value, []selects) {
 	value := reflect.ValueOf(list.Value.Includes)
 	if !list.HasConfigurableValues() {
-		return value, nil, nil
+		return value, []selects{}
 	}
 
 	archSelects := map[string]reflect.Value{}
@@ -62,29 +78,30 @@ func getLabelListValues(list bazel.LabelListAttribute) (reflect.Value, selects,
 		osSelects[selectKey] = reflect.ValueOf(list.GetValueForOS(os).Includes)
 	}
 
-	return value, archSelects, osSelects
+	return value, []selects{archSelects, osSelects}
 }
 
 // prettyPrintAttribute converts an Attribute to its Bazel syntax. May contain
 // select statements.
 func prettyPrintAttribute(v bazel.Attribute, indent int) (string, error) {
 	var value reflect.Value
-	var archSelects, osSelects selects
+	var configurableAttrs []selects
 	var defaultSelectValue string
 	switch list := v.(type) {
 	case bazel.StringListAttribute:
-		value, archSelects, osSelects = getStringListValues(list)
+		value, configurableAttrs = getStringListValues(list)
 		defaultSelectValue = "[]"
 	case bazel.LabelListAttribute:
-		value, archSelects, osSelects = getLabelListValues(list)
+		value, configurableAttrs = getLabelListValues(list)
 		defaultSelectValue = "[]"
 	case bazel.LabelAttribute:
-		value, archSelects, osSelects = getLabelValue(list)
+		value, configurableAttrs = getLabelValue(list)
 		defaultSelectValue = "None"
 	default:
 		return "", fmt.Errorf("Not a supported Bazel attribute type: %s", v)
 	}
 
+	var err error
 	ret := ""
 	if value.Kind() != reflect.Invalid {
 		s, err := prettyPrint(value, indent)
@@ -108,13 +125,14 @@ func prettyPrintAttribute(v bazel.Attribute, indent int) (string, error) {
 		return s, nil
 	}
 
-	ret, err := appendSelects(archSelects, defaultSelectValue, ret)
-	if err != nil {
-		return "", err
+	for _, configurableAttr := range configurableAttrs {
+		ret, err = appendSelects(configurableAttr, defaultSelectValue, ret)
+		if err != nil {
+			return "", err
+		}
 	}
 
-	ret, err = appendSelects(osSelects, defaultSelectValue, ret)
-	return ret, err
+	return ret, nil
 }
 
 // prettyPrintSelectMap converts a map of select keys to reflected Values as a generic way
@@ -125,11 +143,10 @@ func prettyPrintSelectMap(selectMap map[string]reflect.Value, defaultValue strin
 	}
 
 	// addConditionsDefault := false
-	conditionsDefaultKey := bazel.PlatformArchMap[bazel.CONDITIONS_DEFAULT]
 
 	var selects string
 	for _, selectKey := range android.SortedStringKeys(selectMap) {
-		if selectKey == conditionsDefaultKey {
+		if selectKey == bazel.ConditionsDefaultSelectKey {
 			// Handle default condition later.
 			continue
 		}
@@ -159,14 +176,14 @@ func prettyPrintSelectMap(selectMap map[string]reflect.Value, defaultValue strin
 	ret += selects
 
 	// Handle the default condition
-	s, err := prettyPrintSelectEntry(selectMap[conditionsDefaultKey], conditionsDefaultKey, indent)
+	s, err := prettyPrintSelectEntry(selectMap[bazel.ConditionsDefaultSelectKey], bazel.ConditionsDefaultSelectKey, indent)
 	if err != nil {
 		return "", err
 	}
 	if s == "" {
 		// Print an explicit empty list (the default value) even if the value is
 		// empty, to avoid errors about not finding a configuration that matches.
-		ret += fmt.Sprintf("%s\"%s\": %s,\n", makeIndent(indent+1), "//conditions:default", defaultValue)
+		ret += fmt.Sprintf("%s\"%s\": %s,\n", makeIndent(indent+1), bazel.ConditionsDefaultSelectKey, defaultValue)
 	} else {
 		// Print the custom default value.
 		ret += s

cc/bp2build.go

@@ -318,6 +318,21 @@ func bp2BuildParseCompilerProps(ctx android.TopDownMutatorContext, module *Modul
 		}
 	}
 
+	productVariableProps := android.ProductVariableProperties(ctx)
+	if props, exists := productVariableProps["Cflags"]; exists {
+		for _, prop := range props {
+			flags, ok := prop.Property.([]string)
+			if !ok {
+				ctx.ModuleErrorf("Could not convert product variable cflag property")
+			}
+			newFlags, _ := bazel.TryVariableSubstitutions(flags, prop.ProductConfigVariable)
+			copts.ProductValues = append(copts.ProductValues, bazel.ProductVariableValues{
+				ProductVariable: prop.ProductConfigVariable,
+				Values:          newFlags,
+			})
+		}
+	}
+
 	return compilerAttributes{
 		srcs:  srcs,
 		copts: copts,

cc/object.go

@@ -116,7 +116,7 @@ type bazelObjectAttributes struct {
 	Hdrs    bazel.LabelListAttribute
 	Deps    bazel.LabelListAttribute
 	Copts   bazel.StringListAttribute
-	Asflags []string
+	Asflags bazel.StringListAttribute
 }
 
 type bazelObject struct {
@@ -157,7 +157,7 @@ func ObjectBp2Build(ctx android.TopDownMutatorContext) {
 
 	// Set arch-specific configurable attributes
 	compilerAttrs := bp2BuildParseCompilerProps(ctx, m)
-	var asFlags []string
+	var asFlags bazel.StringListAttribute
 
 	var deps bazel.LabelListAttribute
 	for _, props := range m.linker.linkerProps() {
@@ -176,10 +176,11 @@ func ObjectBp2Build(ctx android.TopDownMutatorContext) {
 				ctx.ModuleErrorf("Could not convert product variable asflag property")
 				return
 			}
-			// TODO(b/183595873) handle other product variable usages -- as selects?
-			if newFlags, subbed := bazel.TryVariableSubstitutions(flags, prop.ProductConfigVariable); subbed {
-				asFlags = append(asFlags, newFlags...)
-			}
+			newFlags, _ := bazel.TryVariableSubstitutions(flags, prop.ProductConfigVariable)
+			asFlags.ProductValues = append(asFlags.ProductValues, bazel.ProductVariableValues{
+				ProductVariable: prop.ProductConfigVariable,
+				Values:          newFlags,
+			})
 		}
 	}
 	// TODO(b/183595872) warn/error if we're not handling product variables