Add riscv64-linux-android support

Add barebones riscv64-linux-android support.  This should be enough
to add riscv64-specific entries to Android.bp files, but can't
actually compile anything until there are riscv64 toolchains.

Test: arch_test.go
Change-Id: I0dcc7e797d9352dd38243be908a7f19004ff3db1

android/arch.go

@@ -149,6 +149,7 @@ var (
 
 	Arm     = newArch("arm", "lib32")
 	Arm64   = newArch("arm64", "lib64")
+	Riscv64 = newArch("riscv64", "lib64")
 	X86     = newArch("x86", "lib32")
 	X86_64  = newArch("x86_64", "lib64")
 
@@ -318,7 +319,7 @@ var (
 	Windows = newOsType("windows", Host, true, X86, X86_64)
 	// Android is the OS for target devices that run all of Android, including the Linux kernel
 	// and the Bionic libc runtime.
-	Android = newOsType("android", Device, false, Arm, Arm64, X86, X86_64)
+	Android = newOsType("android", Device, false, Arm, Arm64, Riscv64, X86, X86_64)
 
 	// CommonOS is a pseudo OSType for a common OS variant, which is OsType agnostic and which
 	// has dependencies on all the OS variants.

android/arch_test.go

@@ -596,6 +596,7 @@ func TestArchProperties(t *testing.T) {
 				arm64: {
 					a:  ["arm64"],
 				},
+				riscv64: { a: ["riscv64"] },
 				x86: { a:  ["x86"] },
 				x86_64: { a:  ["x86_64"] },
 			},

bazel/configurability.go

@@ -25,6 +25,7 @@ const (
 	// ArchType names in arch.go
 	archArm     = "arm"
 	archArm64   = "arm64"
+	archRiscv64 = "riscv64"
 	archX86     = "x86"
 	archX86_64  = "x86_64"
 
@@ -39,6 +40,7 @@ const (
 	// Targets in arch.go
 	osArchAndroidArm        = "android_arm"
 	osArchAndroidArm64      = "android_arm64"
+	osArchAndroidRiscv64    = "android_riscv64"
 	osArchAndroidX86        = "android_x86"
 	osArchAndroidX86_64     = "android_x86_64"
 	osArchDarwinArm64       = "darwin_arm64"
@@ -99,6 +101,7 @@ func createPlatformArchMap() map[string]string {
 		"arm64": {
 			"dotprod",
 		},
+		"riscv64": {},
 		"x86": {
 			"ssse3",
 			"sse4",
@@ -164,6 +167,7 @@ var (
 	platformOsArchMap = map[string]string{
 		osArchAndroidArm:           "//build/bazel/platforms/os_arch:android_arm",
 		osArchAndroidArm64:         "//build/bazel/platforms/os_arch:android_arm64",
+		osArchAndroidRiscv64:       "//build/bazel/platforms/os_arch:android_riscv64",
 		osArchAndroidX86:           "//build/bazel/platforms/os_arch:android_x86",
 		osArchAndroidX86_64:        "//build/bazel/platforms/os_arch:android_x86_64",
 		osArchDarwinArm64:          "//build/bazel/platforms/os_arch:darwin_arm64",
@@ -187,7 +191,7 @@ var (
 	// TODO(cparsons): Source from arch.go; this task is nontrivial, as it currently results
 	// in a cyclic dependency.
 	osToArchMap = map[string][]string{
-		OsAndroid:     {archArm, archArm64, archX86, archX86_64},
+		OsAndroid:     {archArm, archArm64, archRiscv64, archX86, archX86_64},
 		osLinux:       {archX86, archX86_64},
 		osLinuxMusl:   {archX86, archX86_64},
 		osDarwin:      {archArm64, archX86_64},

bp2build/build_conversion_test.go

@@ -369,6 +369,7 @@ custom {
       x86_64:  { arch_paths: ["x86_64.txt"] },
       arm:  { arch_paths: ["arm.txt"] },
       arm64:  { arch_paths: ["arm64.txt"] },
+      riscv64: { arch_paths: ["riscv64.txt"] },
     },
     target: {
       linux: { arch_paths: ["linux.txt"] },
@@ -401,6 +402,10 @@ custom {
             "arm64.txt",
             "lib64.txt",
         ],
+        "//build/bazel/platforms/arch:riscv64": [
+            "riscv64.txt",
+            "lib64.txt",
+        ],
         "//build/bazel/platforms/arch:x86": [
             "x86.txt",
             "lib32.txt",

bp2build/cc_library_static_conversion_test.go

@@ -836,6 +836,10 @@ cc_library_static {
             "not-for-lib32.c",
             "for-lib64.c",
         ],
+        "//build/bazel/platforms/arch:riscv64": [
+            "not-for-lib32.c",
+            "for-lib64.c",
+        ],
         "//build/bazel/platforms/arch:x86": [
             "not-for-lib64.c",
             "for-lib32.c",
@@ -867,6 +871,7 @@ func TestCcLibrarySTaticArchMultilibSrcsExcludeSrcs(t *testing.T) {
 			"for-lib64.c":          "",
 			"not-for-arm.c":        "",
 			"not-for-arm64.c":      "",
+			"not-for-riscv64.c":    "",
 			"not-for-x86.c":        "",
 			"not-for-x86_64.c":     "",
 			"not-for-lib32.c":      "",
@@ -881,6 +886,7 @@ cc_library_static {
    arch: {
        arm: { srcs: ["for-arm.c"], exclude_srcs: ["not-for-arm.c"] },
        arm64: { srcs: ["for-arm64.c"], exclude_srcs: ["not-for-arm64.c"] },
+       riscv64: { srcs: ["for-riscv64.c"], exclude_srcs: ["not-for-riscv64.c"] },
        x86: { srcs: ["for-x86.c"], exclude_srcs: ["not-for-x86.c"] },
        x86_64: { srcs: ["for-x86_64.c"], exclude_srcs: ["not-for-x86_64.c"] },
    },
@@ -896,6 +902,7 @@ cc_library_static {
         "//build/bazel/platforms/arch:arm": [
             "not-for-arm64.c",
             "not-for-lib64.c",
+            "not-for-riscv64.c",
             "not-for-x86.c",
             "not-for-x86_64.c",
             "for-arm.c",
@@ -904,15 +911,26 @@ cc_library_static {
         "//build/bazel/platforms/arch:arm64": [
             "not-for-arm.c",
             "not-for-lib32.c",
+            "not-for-riscv64.c",
             "not-for-x86.c",
             "not-for-x86_64.c",
             "for-arm64.c",
             "for-lib64.c",
         ],
+        "//build/bazel/platforms/arch:riscv64": [
+            "not-for-arm.c",
+            "not-for-arm64.c",
+            "not-for-lib32.c",
+            "not-for-x86.c",
+            "not-for-x86_64.c",
+            "for-riscv64.c",
+            "for-lib64.c",
+        ],
         "//build/bazel/platforms/arch:x86": [
             "not-for-arm.c",
             "not-for-arm64.c",
             "not-for-lib64.c",
+            "not-for-riscv64.c",
             "not-for-x86_64.c",
             "for-x86.c",
             "for-lib32.c",
@@ -921,6 +939,7 @@ cc_library_static {
             "not-for-arm.c",
             "not-for-arm64.c",
             "not-for-lib32.c",
+            "not-for-riscv64.c",
             "not-for-x86.c",
             "for-x86_64.c",
             "for-lib64.c",
@@ -930,6 +949,7 @@ cc_library_static {
             "not-for-arm64.c",
             "not-for-lib32.c",
             "not-for-lib64.c",
+            "not-for-riscv64.c",
             "not-for-x86.c",
             "not-for-x86_64.c",
         ],

cc/config/Android.bp

@@ -21,6 +21,7 @@ bootstrap_go_package {
 
         "arm_device.go",
         "arm64_device.go",
+        "riscv64_device.go",
         "x86_device.go",
         "x86_64_device.go",
 

cc/config/riscv64_device.go

@@ -0,0 +1,140 @@
+// Copyright 2022 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package config
+
+import (
+	"fmt"
+	"strings"
+
+	"android/soong/android"
+)
+
+var (
+	riscv64Cflags = []string{
+		// Help catch common 32/64-bit errors.
+		"-Werror=implicit-function-declaration",
+	}
+
+	riscv64ArchVariantCflags = map[string][]string{}
+
+	riscv64Ldflags = []string{
+		"-Wl,--hash-style=gnu",
+		"-Wl,-z,separate-code",
+	}
+
+	riscv64Lldflags = append(riscv64Ldflags,
+		"-Wl,-z,max-page-size=4096")
+
+	riscv64Cppflags = []string{}
+
+	riscv64CpuVariantCflags = map[string][]string{}
+)
+
+const ()
+
+func init() {
+
+	exportedVars.ExportStringListStaticVariable("Riscv64Ldflags", riscv64Ldflags)
+	exportedVars.ExportStringListStaticVariable("Riscv64Lldflags", riscv64Lldflags)
+
+	exportedVars.ExportStringListStaticVariable("Riscv64Cflags", riscv64Cflags)
+	exportedVars.ExportStringListStaticVariable("Riscv64Cppflags", riscv64Cppflags)
+
+	exportedVars.ExportVariableReferenceDict("Riscv64ArchVariantCflags", riscv64ArchVariantCflagsVar)
+	exportedVars.ExportVariableReferenceDict("Riscv64CpuVariantCflags", riscv64CpuVariantCflagsVar)
+	exportedVars.ExportVariableReferenceDict("Riscv64CpuVariantLdflags", riscv64CpuVariantLdflags)
+}
+
+var (
+	riscv64ArchVariantCflagsVar = map[string]string{}
+
+	riscv64CpuVariantCflagsVar = map[string]string{}
+
+	riscv64CpuVariantLdflags = map[string]string{}
+)
+
+type toolchainRiscv64 struct {
+	toolchainBionic
+	toolchain64Bit
+
+	ldflags         string
+	lldflags        string
+	toolchainCflags string
+}
+
+func (t *toolchainRiscv64) Name() string {
+	return "riscv64"
+}
+
+func (t *toolchainRiscv64) IncludeFlags() string {
+	return ""
+}
+
+func (t *toolchainRiscv64) ClangTriple() string {
+	return "riscv64-linux-android"
+}
+
+func (t *toolchainRiscv64) Cflags() string {
+	return "${config.Riscv64Cflags}"
+}
+
+func (t *toolchainRiscv64) Cppflags() string {
+	return "${config.Riscv64Cppflags}"
+}
+
+func (t *toolchainRiscv64) Ldflags() string {
+	return t.ldflags
+}
+
+func (t *toolchainRiscv64) Lldflags() string {
+	return t.lldflags
+}
+
+func (t *toolchainRiscv64) ToolchainCflags() string {
+	return t.toolchainCflags
+}
+
+func (toolchainRiscv64) LibclangRuntimeLibraryArch() string {
+	return "riscv64"
+}
+
+func riscv64ToolchainFactory(arch android.Arch) Toolchain {
+	switch arch.ArchVariant {
+	case "":
+	default:
+		panic(fmt.Sprintf("Unknown Riscv64 architecture version: %q", arch.ArchVariant))
+	}
+
+	toolchainCflags := []string{riscv64ArchVariantCflagsVar[arch.ArchVariant]}
+	toolchainCflags = append(toolchainCflags,
+		variantOrDefault(riscv64CpuVariantCflagsVar, arch.CpuVariant))
+
+	extraLdflags := variantOrDefault(riscv64CpuVariantLdflags, arch.CpuVariant)
+	return &toolchainRiscv64{
+		ldflags: strings.Join([]string{
+			"${config.Riscv64Ldflags}",
+			extraLdflags,
+		}, " "),
+		lldflags: strings.Join([]string{
+			"${config.Riscv64Lldflags}",
+			extraLdflags,
+		}, " "),
+		toolchainCflags: strings.Join(toolchainCflags, " "),
+	}
+}
+
+func init() {
+	registerToolchainFactory(android.Android, android.Riscv64, riscv64ToolchainFactory)
+}

rust/config/Android.bp

@@ -15,6 +15,7 @@ bootstrap_go_package {
         "arm64_device.go",
         "global.go",
         "lints.go",
+        "riscv64_device.go",
         "toolchain.go",
         "darwin_host.go",
         "x86_linux_bionic_host.go",

rust/config/riscv64_device.go

@@ -0,0 +1,91 @@
+// Copyright 2022 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package config
+
+import (
+	"strings"
+
+	"android/soong/android"
+)
+
+var (
+	Riscv64RustFlags            = []string{}
+	Riscv64ArchFeatureRustFlags = map[string][]string{"": {}}
+	Riscv64LinkFlags            = []string{}
+
+	Riscv64ArchVariantRustFlags = map[string][]string{}
+)
+
+func init() {
+	registerToolchainFactory(android.Android, android.Riscv64, Riscv64ToolchainFactory)
+
+	pctx.StaticVariable("Riscv64ToolchainRustFlags", strings.Join(Riscv64RustFlags, " "))
+	pctx.StaticVariable("Riscv64ToolchainLinkFlags", strings.Join(Riscv64LinkFlags, " "))
+
+	for variant, rustFlags := range Riscv64ArchVariantRustFlags {
+		pctx.StaticVariable("Riscv64"+variant+"VariantRustFlags",
+			strings.Join(rustFlags, " "))
+	}
+
+}
+
+type toolchainRiscv64 struct {
+	toolchain64Bit
+	toolchainRustFlags string
+}
+
+func (t *toolchainRiscv64) RustTriple() string {
+	return "riscv64-linux-android"
+}
+
+func (t *toolchainRiscv64) ToolchainLinkFlags() string {
+	// Prepend the lld flags from cc_config so we stay in sync with cc
+	return "${config.DeviceGlobalLinkFlags} ${cc_config.Riscv64Lldflags} ${config.Riscv64ToolchainLinkFlags}"
+}
+
+func (t *toolchainRiscv64) ToolchainRustFlags() string {
+	return t.toolchainRustFlags
+}
+
+func (t *toolchainRiscv64) RustFlags() string {
+	return "${config.Riscv64ToolchainRustFlags}"
+}
+
+func (t *toolchainRiscv64) Supported() bool {
+	return true
+}
+
+func (toolchainRiscv64) LibclangRuntimeLibraryArch() string {
+	return "riscv64"
+}
+
+func Riscv64ToolchainFactory(arch android.Arch) Toolchain {
+	archVariant := arch.ArchVariant
+
+	toolchainRustFlags := []string{
+		"${config.Riscv64ToolchainRustFlags}",
+		"${config.Riscv64" + archVariant + "VariantRustFlags}",
+	}
+
+	toolchainRustFlags = append(toolchainRustFlags, deviceGlobalRustFlags...)
+
+	for _, feature := range arch.ArchFeatures {
+		toolchainRustFlags = append(toolchainRustFlags, Riscv64ArchFeatureRustFlags[feature]...)
+	}
+
+	return &toolchainRiscv64{
+		toolchainRustFlags: strings.Join(toolchainRustFlags, " "),
+	}
+}