[infra] Add configuration for testing SIMARM64 on ARM64.

Bug: https://github.com/dart-lang/sdk/issues/60204
Change-Id: Id49d144bedb7eb2047ee1cc36dd737bff62e808e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/411840
Reviewed-by: Daco Harkes <dacoharkes@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>

pkg/smith/lib/configuration.dart

@@ -722,6 +722,8 @@ class Architecture extends NamedEnum {
   // ignore: constant_identifier_names
   static const simarm_x64 = Architecture._('simarm_x64');
   static const simarm64 = Architecture._('simarm64');
+  // ignore: constant_identifier_names
+  static const simarm64_arm64 = Architecture._('simarm64_arm64');
   static const simarm64c = Architecture._('simarm64c');
   static const riscv32 = Architecture._('riscv32');
   static const riscv64 = Architecture._('riscv64');
@@ -743,6 +745,7 @@ class Architecture extends NamedEnum {
     simarm,
     simarm_x64,
     simarm64,
+    simarm64_arm64,
     simarm64c,
     riscv32,
     riscv64,

pkg/test_runner/lib/src/runtime_configuration.dart

@@ -308,6 +308,8 @@ class QemuConfig {
         QemuConfig('qemu-arm', ['-L', '/usr/arm-linux-gnueabihf/']),
     Architecture.arm64:
         QemuConfig('qemu-aarch64', ['-L', '/usr/aarch64-linux-gnu/']),
+    Architecture.simarm64_arm64:
+        QemuConfig('qemu-aarch64', ['-L', '/usr/aarch64-linux-gnu/']),
     Architecture.arm64c:
         QemuConfig('qemu-aarch64', ['-L', '/usr/aarch64-linux-gnu/']),
     Architecture.riscv32:

runtime/BUILD.gn

@@ -147,6 +147,9 @@ config("dart_arch_config") {
     print("Invalid dart_target_arch: $dart_target_arch")
     assert(false)
   }
+  if (dart_force_simulator) {
+    defines += [ "USING_SIMULATOR" ]
+  }
 }
 
 config("dart_config") {

runtime/runtime_args.gni

@@ -31,6 +31,9 @@ declare_args() {
   # Available options are: arm, arm64, x64, ia32, riscv32, riscv64.
   dart_target_arch = target_cpu
 
+  # Force use of the simulator even when the Dart target arch matches the current cpu.
+  dart_force_simulator = false
+
   # The optimization level to use for debug builds. Defaults to 0 for builds with
   # code coverage enabled.
   dart_debug_optimization_level = "2"

tests/ffi/ffi.status

@@ -75,7 +75,7 @@ regress_47594_test: Skip # DynamicLibrary.process() is not available on Windows.
 function_callbacks_leaf_test: SkipByDesign # Needs access to Dart executable
 native_assets/*: SkipByDesign # Only intended to run on host oses with AOT binaries available, not available on QEMU.
 
-[ $simulator ]
+[ $arch != simarm64_arm64 && $simulator ]
 *: Skip # FFI not yet supported on the arm simulator.
 
 [ $compiler != dart2analyzer && $compiler != fasta && $runtime != dart_precompiled && $runtime != vm ]

tools/bots/test_matrix.json

@@ -333,7 +333,7 @@
         "builder-tag": "ffi"
       }
     },
-    "vm-(linux|mac|win|android|fuchsia)-(debug|product|release)-(ia32|x64|x64c|arm|arm64|arm64c|simarm|simarm64|simriscv32|simriscv64)": {
+    "vm-(linux|mac|win|android|fuchsia)-(debug|product|release)-(ia32|x64|x64c|arm|arm64|arm64c|simarm|simarm64|simarm64_arm64|simriscv32|simriscv64)": {
       "options": {}
     },
     "vm-checked-(linux|mac|win|fuchsia)-(debug|product|release)-(ia32|x64|x64c|arm64|arm64c|simarm|simarm64|simriscv32|simriscv64)": {
@@ -847,6 +847,31 @@
         }
       ]
     },
+    {
+      "builders": [
+        "vm-ffi-mac-debug-simarm64_arm64",
+        "vm-ffi-mac-release-simarm64_arm64"
+      ],
+      "meta": {
+        "description": "This configuration is used for running FFI tests"
+      },
+      "steps": [
+        {
+          "name": "build dart",
+          "script": "tools/build.py",
+          "arguments": [
+            "runtime"
+          ]
+        },
+        {
+          "name": "vm ffi tests",
+          "arguments": [
+            "-nvm-${system}-${mode}-${arch}",
+            "ffi"
+          ]
+        }
+      ]
+    },
     {
       "builders": [
         "vm-ffi-qemu-linux-release-arm"

tools/gn.py

@@ -205,6 +205,9 @@ def ToGnArgs(args, mode, arch, target_os, sanitizer, verify_sdk_hash,
     gn_args['host_cpu'] = HostCpuForArch(arch)
     gn_args['target_cpu'] = TargetCpuForArch(arch)
     gn_args['dart_target_arch'] = DartTargetCpuForArch(arch)
+    if gn_args['target_cpu'] == gn_args['dart_target_arch'] and arch.startswith(
+            'sim'):
+        gn_args['dart_force_simulator'] = True
     gn_args['dart_use_compressed_pointers'] = IsCompressedPointerArch(arch)
 
     # Configure Crashpad library if it is used.