bp2build: group shared/static attrs into a struct.

This makes bp2build generate these attrs into a Starlark dictionary,
passed into the cc_library macro directly. This makes the BUILD target
representation more similar to the Android.bp one, and also makes
it more legible.

Test: TH
Change-Id: I42b427cc4b22c6376d3d24e40b9af1692bb0c692
diff --git a/bp2build/cc_library_conversion_test.go b/bp2build/cc_library_conversion_test.go
index 7f6982c..285677a 100644
--- a/bp2build/cc_library_conversion_test.go
+++ b/bp2build/cc_library_conversion_test.go
@@ -385,19 +385,23 @@
         "-I$(BINDIR)/foo/bar",
     ],
     dynamic_deps = [":shared_dep_for_both"],
-    dynamic_deps_for_shared = [":shared_dep_for_shared"],
-    dynamic_deps_for_static = [":shared_dep_for_static"],
     implementation_deps = [":static_dep_for_both"],
-    shared_copts = ["sharedflag"],
-    shared_srcs = ["sharedonly.cpp"],
+    shared = {
+        "copts": ["sharedflag"],
+        "dynamic_deps": [":shared_dep_for_shared"],
+        "srcs": ["sharedonly.cpp"],
+        "static_deps": [":static_dep_for_shared"],
+        "whole_archive_deps": [":whole_static_lib_for_shared"],
+    },
     srcs = ["both.cpp"],
-    static_copts = ["staticflag"],
-    static_deps_for_shared = [":static_dep_for_shared"],
-    static_deps_for_static = [":static_dep_for_static"],
-    static_srcs = ["staticonly.cpp"],
+    static = {
+        "copts": ["staticflag"],
+        "dynamic_deps": [":shared_dep_for_static"],
+        "srcs": ["staticonly.cpp"],
+        "static_deps": [":static_dep_for_static"],
+        "whole_archive_deps": [":whole_static_lib_for_static"],
+    },
     whole_archive_deps = [":whole_static_lib_for_both"],
-    whole_archive_deps_for_shared = [":whole_static_lib_for_shared"],
-    whole_archive_deps_for_static = [":whole_static_lib_for_static"],
 )`},
 	})
 }
@@ -437,9 +441,13 @@
         "-Ifoo/bar",
         "-I$(BINDIR)/foo/bar",
     ],
+    shared = {
+        "whole_archive_deps": [":whole_static_lib_for_shared_alwayslink"],
+    },
+    static = {
+        "whole_archive_deps": [":whole_static_lib_for_static_alwayslink"],
+    },
     whole_archive_deps = [":whole_static_lib_for_both_alwayslink"],
-    whole_archive_deps_for_shared = [":whole_static_lib_for_shared_alwayslink"],
-    whole_archive_deps_for_static = [":whole_static_lib_for_static_alwayslink"],
 )`},
 	})
 }
@@ -529,52 +537,56 @@
         "-Ifoo/bar",
         "-I$(BINDIR)/foo/bar",
     ],
-    dynamic_deps_for_shared = select({
-        "//build/bazel/platforms/arch:arm": [":arm_shared_dep_for_shared"],
-        "//conditions:default": [],
-    }),
     implementation_deps = [":static_dep_for_both"],
-    shared_copts = ["sharedflag"] + select({
-        "//build/bazel/platforms/arch:arm": ["-DARM_SHARED"],
-        "//conditions:default": [],
-    }) + select({
-        "//build/bazel/platforms/os:android": ["-DANDROID_SHARED"],
-        "//conditions:default": [],
-    }) + select({
-        "//build/bazel/platforms/os_arch:android_arm": ["-DANDROID_ARM_SHARED"],
-        "//conditions:default": [],
-    }),
-    shared_srcs = ["sharedonly.cpp"] + select({
-        "//build/bazel/platforms/arch:arm": ["arm_shared.cpp"],
-        "//conditions:default": [],
-    }) + select({
-        "//build/bazel/platforms/os:android": ["android_shared.cpp"],
-        "//conditions:default": [],
-    }),
+    shared = {
+        "copts": ["sharedflag"] + select({
+            "//build/bazel/platforms/arch:arm": ["-DARM_SHARED"],
+            "//conditions:default": [],
+        }) + select({
+            "//build/bazel/platforms/os:android": ["-DANDROID_SHARED"],
+            "//conditions:default": [],
+        }) + select({
+            "//build/bazel/platforms/os_arch:android_arm": ["-DANDROID_ARM_SHARED"],
+            "//conditions:default": [],
+        }),
+        "dynamic_deps": select({
+            "//build/bazel/platforms/arch:arm": [":arm_shared_dep_for_shared"],
+            "//conditions:default": [],
+        }),
+        "srcs": ["sharedonly.cpp"] + select({
+            "//build/bazel/platforms/arch:arm": ["arm_shared.cpp"],
+            "//conditions:default": [],
+        }) + select({
+            "//build/bazel/platforms/os:android": ["android_shared.cpp"],
+            "//conditions:default": [],
+        }),
+        "static_deps": [":static_dep_for_shared"] + select({
+            "//build/bazel/platforms/arch:arm": [":arm_static_dep_for_shared"],
+            "//conditions:default": [],
+        }) + select({
+            "//build/bazel/platforms/os:android": [":android_dep_for_shared"],
+            "//conditions:default": [],
+        }),
+        "whole_archive_deps": select({
+            "//build/bazel/platforms/arch:arm": [":arm_whole_static_dep_for_shared"],
+            "//conditions:default": [],
+        }),
+    },
     srcs = ["both.cpp"],
-    static_copts = ["staticflag"] + select({
-        "//build/bazel/platforms/arch:x86": ["-DX86_STATIC"],
-        "//conditions:default": [],
-    }),
-    static_deps_for_shared = [":static_dep_for_shared"] + select({
-        "//build/bazel/platforms/arch:arm": [":arm_static_dep_for_shared"],
-        "//conditions:default": [],
-    }) + select({
-        "//build/bazel/platforms/os:android": [":android_dep_for_shared"],
-        "//conditions:default": [],
-    }),
-    static_deps_for_static = [":static_dep_for_static"] + select({
-        "//build/bazel/platforms/arch:x86": [":x86_dep_for_static"],
-        "//conditions:default": [],
-    }),
-    static_srcs = ["staticonly.cpp"] + select({
-        "//build/bazel/platforms/arch:x86": ["x86_static.cpp"],
-        "//conditions:default": [],
-    }),
-    whole_archive_deps_for_shared = select({
-        "//build/bazel/platforms/arch:arm": [":arm_whole_static_dep_for_shared"],
-        "//conditions:default": [],
-    }),
+    static = {
+        "copts": ["staticflag"] + select({
+            "//build/bazel/platforms/arch:x86": ["-DX86_STATIC"],
+            "//conditions:default": [],
+        }),
+        "srcs": ["staticonly.cpp"] + select({
+            "//build/bazel/platforms/arch:x86": ["x86_static.cpp"],
+            "//conditions:default": [],
+        }),
+        "static_deps": [":static_dep_for_static"] + select({
+            "//build/bazel/platforms/arch:x86": [":x86_dep_for_static"],
+            "//conditions:default": [],
+        }),
+    },
 )`},
 	})
 }
@@ -666,20 +678,22 @@
         "-Ifoo/bar",
         "-I$(BINDIR)/foo/bar",
     ],
-    shared_srcs = [
-        ":shared_filegroup_cpp_srcs",
-        "shared_source.cc",
-        "shared_source.cpp",
-    ],
-    shared_srcs_as = [
-        "shared_source.s",
-        "shared_source.S",
-        ":shared_filegroup_as_srcs",
-    ],
-    shared_srcs_c = [
-        "shared_source.c",
-        ":shared_filegroup_c_srcs",
-    ],
+    shared = {
+        "srcs": [
+            ":shared_filegroup_cpp_srcs",
+            "shared_source.cc",
+            "shared_source.cpp",
+        ],
+        "srcs_as": [
+            "shared_source.s",
+            "shared_source.S",
+            ":shared_filegroup_as_srcs",
+        ],
+        "srcs_c": [
+            "shared_source.c",
+            ":shared_filegroup_c_srcs",
+        ],
+    },
     srcs = [
         ":both_filegroup_cpp_srcs",
         "both_source.cc",
@@ -694,20 +708,22 @@
         "both_source.c",
         ":both_filegroup_c_srcs",
     ],
-    static_srcs = [
-        ":static_filegroup_cpp_srcs",
-        "static_source.cc",
-        "static_source.cpp",
-    ],
-    static_srcs_as = [
-        "static_source.s",
-        "static_source.S",
-        ":static_filegroup_as_srcs",
-    ],
-    static_srcs_c = [
-        "static_source.c",
-        ":static_filegroup_c_srcs",
-    ],
+    static = {
+        "srcs": [
+            ":static_filegroup_cpp_srcs",
+            "static_source.cc",
+            "static_source.cpp",
+        ],
+        "srcs_as": [
+            "static_source.s",
+            "static_source.S",
+            ":static_filegroup_as_srcs",
+        ],
+        "srcs_c": [
+            "static_source.c",
+            ":static_filegroup_c_srcs",
+        ],
+    },
 )`},
 	})
 }
diff --git a/cc/bp2build.go b/cc/bp2build.go
index 7c6ee0a..76c5f3b 100644
--- a/cc/bp2build.go
+++ b/cc/bp2build.go
@@ -142,15 +142,14 @@
 // staticOrSharedAttributes are the Bazel-ified versions of StaticOrSharedProperties --
 // properties which apply to either the shared or static version of a cc_library module.
 type staticOrSharedAttributes struct {
-	srcs    bazel.LabelListAttribute
-	srcs_c  bazel.LabelListAttribute
-	srcs_as bazel.LabelListAttribute
+	Srcs    bazel.LabelListAttribute
+	Srcs_c  bazel.LabelListAttribute
+	Srcs_as bazel.LabelListAttribute
+	Copts   bazel.StringListAttribute
 
-	copts bazel.StringListAttribute
-
-	staticDeps       bazel.LabelListAttribute
-	dynamicDeps      bazel.LabelListAttribute
-	wholeArchiveDeps bazel.LabelListAttribute
+	Static_deps        bazel.LabelListAttribute
+	Dynamic_deps       bazel.LabelListAttribute
+	Whole_archive_deps bazel.LabelListAttribute
 }
 
 func groupSrcsByExtension(ctx android.TopDownMutatorContext, srcs bazel.LabelListAttribute) (cppSrcs, cSrcs, asSrcs bazel.LabelListAttribute) {
@@ -251,19 +250,19 @@
 	}
 
 	attrs := staticOrSharedAttributes{
-		copts:            bazel.StringListAttribute{Value: props.Cflags},
-		srcs:             bazel.MakeLabelListAttribute(android.BazelLabelForModuleSrc(ctx, props.Srcs)),
-		staticDeps:       bazel.MakeLabelListAttribute(android.BazelLabelForModuleDeps(ctx, props.Static_libs)),
-		dynamicDeps:      bazel.MakeLabelListAttribute(android.BazelLabelForModuleDeps(ctx, props.Shared_libs)),
-		wholeArchiveDeps: bazel.MakeLabelListAttribute(android.BazelLabelForModuleWholeDeps(ctx, props.Whole_static_libs)),
+		Copts:              bazel.StringListAttribute{Value: props.Cflags},
+		Srcs:               bazel.MakeLabelListAttribute(android.BazelLabelForModuleSrc(ctx, props.Srcs)),
+		Static_deps:        bazel.MakeLabelListAttribute(android.BazelLabelForModuleDeps(ctx, props.Static_libs)),
+		Dynamic_deps:       bazel.MakeLabelListAttribute(android.BazelLabelForModuleDeps(ctx, props.Shared_libs)),
+		Whole_archive_deps: bazel.MakeLabelListAttribute(android.BazelLabelForModuleWholeDeps(ctx, props.Whole_static_libs)),
 	}
 
 	setAttrs := func(axis bazel.ConfigurationAxis, config string, props StaticOrSharedProperties) {
-		attrs.copts.SetSelectValue(axis, config, props.Cflags)
-		attrs.srcs.SetSelectValue(axis, config, android.BazelLabelForModuleSrc(ctx, props.Srcs))
-		attrs.staticDeps.SetSelectValue(axis, config, android.BazelLabelForModuleDeps(ctx, props.Static_libs))
-		attrs.dynamicDeps.SetSelectValue(axis, config, android.BazelLabelForModuleDeps(ctx, props.Shared_libs))
-		attrs.wholeArchiveDeps.SetSelectValue(axis, config, android.BazelLabelForModuleWholeDeps(ctx, props.Whole_static_libs))
+		attrs.Copts.SetSelectValue(axis, config, props.Cflags)
+		attrs.Srcs.SetSelectValue(axis, config, android.BazelLabelForModuleSrc(ctx, props.Srcs))
+		attrs.Static_deps.SetSelectValue(axis, config, android.BazelLabelForModuleDeps(ctx, props.Static_libs))
+		attrs.Dynamic_deps.SetSelectValue(axis, config, android.BazelLabelForModuleDeps(ctx, props.Shared_libs))
+		attrs.Whole_archive_deps.SetSelectValue(axis, config, android.BazelLabelForModuleWholeDeps(ctx, props.Whole_static_libs))
 	}
 
 	if isStatic {
@@ -284,10 +283,10 @@
 		}
 	}
 
-	cppSrcs, cSrcs, asSrcs := groupSrcsByExtension(ctx, attrs.srcs)
-	attrs.srcs = cppSrcs
-	attrs.srcs_c = cSrcs
-	attrs.srcs_as = asSrcs
+	cppSrcs, cSrcs, asSrcs := groupSrcsByExtension(ctx, attrs.Srcs)
+	attrs.Srcs = cppSrcs
+	attrs.Srcs_c = cSrcs
+	attrs.Srcs_as = asSrcs
 
 	return attrs
 }
diff --git a/cc/library.go b/cc/library.go
index 3061be4..6ab8300 100644
--- a/cc/library.go
+++ b/cc/library.go
@@ -237,29 +237,12 @@
 	Linkopts            bazel.StringListAttribute
 	Use_libcrt          bazel.BoolAttribute
 
-	// Attributes pertaining to shared variant.
-	Shared_srcs    bazel.LabelListAttribute
-	Shared_srcs_c  bazel.LabelListAttribute
-	Shared_srcs_as bazel.LabelListAttribute
-	Shared_copts   bazel.StringListAttribute
+	// This is shared only.
+	Version_script bazel.LabelAttribute
 
-	Exported_deps_for_shared      bazel.LabelListAttribute
-	Static_deps_for_shared        bazel.LabelListAttribute
-	Dynamic_deps_for_shared       bazel.LabelListAttribute
-	Whole_archive_deps_for_shared bazel.LabelListAttribute
-	User_link_flags               bazel.StringListAttribute
-	Version_script                bazel.LabelAttribute
-
-	// Attributes pertaining to static variant.
-	Static_srcs    bazel.LabelListAttribute
-	Static_srcs_c  bazel.LabelListAttribute
-	Static_srcs_as bazel.LabelListAttribute
-	Static_copts   bazel.StringListAttribute
-
-	Exported_deps_for_static      bazel.LabelListAttribute
-	Static_deps_for_static        bazel.LabelListAttribute
-	Dynamic_deps_for_static       bazel.LabelListAttribute
-	Whole_archive_deps_for_static bazel.LabelListAttribute
+	// Common properties shared between both shared and static variants.
+	Shared staticOrSharedAttributes
+	Static staticOrSharedAttributes
 
 	Strip stripAttributes
 }
@@ -334,6 +317,8 @@
 		Linkopts:            linkerAttrs.linkopts,
 		Use_libcrt:          linkerAttrs.useLibcrt,
 
+		Version_script: linkerAttrs.versionScript,
+
 		Strip: stripAttributes{
 			Keep_symbols:                 linkerAttrs.stripKeepSymbols,
 			Keep_symbols_and_debug_frame: linkerAttrs.stripKeepSymbolsAndDebugFrame,
@@ -342,22 +327,9 @@
 			None:                         linkerAttrs.stripNone,
 		},
 
-		Shared_srcs:                   sharedAttrs.srcs,
-		Shared_srcs_c:                 sharedAttrs.srcs_c,
-		Shared_srcs_as:                sharedAttrs.srcs_as,
-		Shared_copts:                  sharedAttrs.copts,
-		Static_deps_for_shared:        sharedAttrs.staticDeps,
-		Whole_archive_deps_for_shared: sharedAttrs.wholeArchiveDeps,
-		Dynamic_deps_for_shared:       sharedAttrs.dynamicDeps,
-		Version_script:                linkerAttrs.versionScript,
+		Shared: sharedAttrs,
 
-		Static_srcs:                   staticAttrs.srcs,
-		Static_srcs_c:                 staticAttrs.srcs_c,
-		Static_srcs_as:                staticAttrs.srcs_as,
-		Static_copts:                  staticAttrs.copts,
-		Static_deps_for_static:        staticAttrs.staticDeps,
-		Whole_archive_deps_for_static: staticAttrs.wholeArchiveDeps,
-		Dynamic_deps_for_static:       staticAttrs.dynamicDeps,
+		Static: staticAttrs,
 	}
 
 	props := bazel.BazelTargetModuleProperties{