[vm/ffi] Support packed Structs

Closes: dart-lang#38158 This CL implements unaligned access for float/double on arm32, but does not expose it in an API. Rather it only uses these loads/stores inside the getters and setters of packed structs. Bug: dart-lang#45009 Besides unaligned access for float/double, this CL is mostly a CFE change. The only VM change is reading the packing in the `_FfiStructLayout` annotation. The implementation of using the packing in the VM, and analyzer changes have landed separately in earlier CLs. tools/test.py ffi ffi_2 TEST=tests/ffi(_2)/(.*)by_value_(*.)_test.dart Change-Id: Ic3106ecc626d2e30674a49bf03f65ae12d2b3502 Cq-Include-Trybots: luci.dart.try:dart-sdk-linux-try,dart-sdk-mac-try,dart-sdk-win-try,vm-ffi-android-debug-arm-try,vm-ffi-android-debug-arm64-try,vm-kernel-asan-linux-release-x64-try,vm-kernel-mac-debug-x64-try,vm-kernel-linux-debug-ia32-try,vm-kernel-linux-debug-x64-try,vm-kernel-nnbd-linux-debug-x64-try,vm-kernel-nnbd-linux-debug-ia32-try,vm-kernel-nnbd-mac-release-x64-try,vm-kernel-nnbd-win-debug-x64-try,vm-kernel-precomp-linux-debug-x64-try,vm-kernel-precomp-linux-debug-simarm_x64-try,vm-kernel-precomp-nnbd-linux-debug-x64-try,vm-kernel-precomp-win-release-x64-try,vm-kernel-reload-linux-debug-x64-try,vm-kernel-reload-rollback-linux-debug-x64-try,vm-kernel-win-debug-x64-try,vm-kernel-win-debug-ia32-try,vm-precomp-ffi-qemu-linux-release-arm-try,vm-kernel-precomp-obfuscate-linux-release-x64-try,vm-kernel-msan-linux-release-x64-try,vm-kernel-precomp-msan-linux-release-x64-try,vm-kernel-precomp-android-release-arm_x64-try,analyzer-analysis-server-linux-try Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/186143 Reviewed-by: Aske Simon Christensen <askesc@google.com>
ra1u · Mar 19, 2021 · 77dc74b · 77dc74b
1 parent e7acc69
commit 77dc74b
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diff --git a/pkg/_fe_analyzer_shared/lib/src/messages/codes_generated.dart b/pkg/_fe_analyzer_shared/lib/src/messages/codes_generated.dart
@@ -3903,6 +3903,68 @@ Message _withArgumentsFfiNotStatic(String name) {
       arguments: {'name': name});
 }
 
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const Template<Message Function(String name)> templateFfiPackedAnnotation =
+    const Template<Message Function(String name)>(
+        messageTemplate:
+            r"""Struct '#name' must have at most one 'Packed' annotation.""",
+        withArguments: _withArgumentsFfiPackedAnnotation);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const Code<Message Function(String name)> codeFfiPackedAnnotation =
+    const Code<Message Function(String name)>(
+  "FfiPackedAnnotation",
+);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+Message _withArgumentsFfiPackedAnnotation(String name) {
+  if (name.isEmpty) throw 'No name provided';
+  name = demangleMixinApplicationName(name);
+  return new Message(codeFfiPackedAnnotation,
+      message:
+          """Struct '${name}' must have at most one 'Packed' annotation.""",
+      arguments: {'name': name});
+}
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const Code<Null> codeFfiPackedAnnotationAlignment =
+    messageFfiPackedAnnotationAlignment;
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const MessageCode messageFfiPackedAnnotationAlignment = const MessageCode(
+    "FfiPackedAnnotationAlignment",
+    message: r"""Only packing to 1, 2, 4, 8, and 16 bytes is supported.""");
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const Template<
+    Message Function(
+        String name,
+        String
+            name2)> templateFfiPackedNestingNonPacked = const Template<
+        Message Function(String name, String name2)>(
+    messageTemplate:
+        r"""Nesting the non-packed or less tightly packed struct '#name' in a packed struct '#name2' is not supported.""",
+    withArguments: _withArgumentsFfiPackedNestingNonPacked);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const Code<Message Function(String name, String name2)>
+    codeFfiPackedNestingNonPacked =
+    const Code<Message Function(String name, String name2)>(
+  "FfiPackedNestingNonPacked",
+);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+Message _withArgumentsFfiPackedNestingNonPacked(String name, String name2) {
+  if (name.isEmpty) throw 'No name provided';
+  name = demangleMixinApplicationName(name);
+  if (name2.isEmpty) throw 'No name provided';
+  name2 = demangleMixinApplicationName(name2);
+  return new Message(codeFfiPackedNestingNonPacked,
+      message:
+          """Nesting the non-packed or less tightly packed struct '${name}' in a packed struct '${name2}' is not supported.""",
+      arguments: {'name': name, 'name2': name2});
+}
+
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const Template<Message Function(String name)> templateFfiSizeAnnotation =
     const Template<Message Function(String name)>(

diff --git a/pkg/front_end/lib/src/api_unstable/vm.dart b/pkg/front_end/lib/src/api_unstable/vm.dart
@@ -52,6 +52,7 @@ export '../fasta/fasta_codes.dart'
         LocatedMessage,
         messageFfiExceptionalReturnNull,
         messageFfiExpectedConstant,
+        messageFfiPackedAnnotationAlignment,
         noLength,
         templateFfiDartTypeMismatch,
         templateFfiEmptyStruct,
@@ -64,6 +65,8 @@ export '../fasta/fasta_codes.dart'
         templateFfiFieldNoAnnotation,
         templateFfiFieldNull,
         templateFfiNotStatic,
+        templateFfiPackedAnnotation,
+        templateFfiPackedNestingNonPacked,
         templateFfiSizeAnnotation,
         templateFfiSizeAnnotationDimensions,
         templateFfiStructGeneric,

diff --git a/pkg/front_end/messages.status b/pkg/front_end/messages.status
@@ -329,6 +329,9 @@ FfiFieldInitializer/analyzerCode: Fail
 FfiFieldNoAnnotation/analyzerCode: Fail
 FfiFieldNull/analyzerCode: Fail
 FfiNotStatic/analyzerCode: Fail
+FfiPackedAnnotation/analyzerCode: Fail
+FfiPackedAnnotationAlignment/analyzerCode: Fail
+FfiPackedNestingNonPacked/analyzerCode: Fail
 FfiSizeAnnotation/analyzerCode: Fail
 FfiSizeAnnotationDimensions/analyzerCode: Fail
 FfiStructAnnotation/analyzerCode: Fail

diff --git a/pkg/front_end/messages.yaml b/pkg/front_end/messages.yaml
@@ -4279,6 +4279,21 @@ FfiExtendsOrImplementsSealedClass:
   template: "Class '#name' cannot be extended or implemented."
   external: test/ffi_test.dart
 
+FfiPackedAnnotation:
+  # Used by dart:ffi
+  template: "Struct '#name' must have at most one 'Packed' annotation."
+  external: test/ffi_test.dart
+
+FfiPackedAnnotationAlignment:
+  # Used by dart:ffi
+  template: "Only packing to 1, 2, 4, 8, and 16 bytes is supported."
+  external: test/ffi_test.dart
+
+FfiPackedNestingNonPacked:
+  # Used by dart:ffi
+  template: "Nesting the non-packed or less tightly packed struct '#name' in a packed struct '#name2' is not supported."
+  external: test/ffi_test.dart
+
 FfiSizeAnnotation:
   # Used by dart:ffi
   template: "Field '#name' must have exactly one 'Array' annotation."

diff --git a/pkg/front_end/test/spell_checking_list_common.txt b/pkg/front_end/test/spell_checking_list_common.txt
@@ -2113,6 +2113,8 @@ owner
 package
 packaged
 packages
+packed
+packing
 pad
 padded
 padding
@@ -3042,6 +3044,7 @@ throws
 thumb
 thunk
 thus
+tightly
 time
 timeline
 times

diff --git a/pkg/front_end/testcases/general/ffi_sample.dart.weak.transformed.expect b/pkg/front_end/testcases/general/ffi_sample.dart.weak.transformed.expect
@@ -6,9 +6,9 @@ import "dart:ffi" as ffi;
 import "dart:ffi";
 import "package:ffi/ffi.dart";
 
-@#C6
+@#C7
 class Coordinate extends ffi::Struct {
-  static final field core::int* #sizeOf = (#C9).{core::List::[]}(ffi::_abi());
+  static final field core::int* #sizeOf = (#C10).{core::List::[]}(ffi::_abi());
   @#C12
   constructor #fromTypedDataBase(dynamic #pointer) → dynamic
     : super ffi::Struct::_fromPointer(#pointer)
@@ -51,14 +51,14 @@ constants  {
   #C2 = TypeLiteralConstant(ffi::Double)
   #C3 = TypeLiteralConstant(ffi::Pointer<ffi::NativeType>)
   #C4 = <core::Type>[#C2, #C2, #C3]
-  #C5 = ffi::_FfiStructLayout {fieldTypes:#C4}
-  #C6 = core::pragma {name:#C1, options:#C5}
-  #C7 = 24
-  #C8 = 20
-  #C9 = <core::int*>[#C7, #C8, #C7]
-  #C10 = "vm:entry-point"
-  #C11 = null
-  #C12 = core::pragma {name:#C10, options:#C11}
+  #C5 = null
+  #C6 = ffi::_FfiStructLayout {fieldTypes:#C4, packing:#C5}
+  #C7 = core::pragma {name:#C1, options:#C6}
+  #C8 = 24
+  #C9 = 20
+  #C10 = <core::int*>[#C8, #C9, #C8]
+  #C11 = "vm:entry-point"
+  #C12 = core::pragma {name:#C11, options:#C5}
   #C13 = 0
   #C14 = <core::int*>[#C13, #C13, #C13]
   #C15 = 8

diff --git a/pkg/front_end/testcases/incremental/ffi_01.yaml.world.1.expect b/pkg/front_end/testcases/incremental/ffi_01.yaml.world.1.expect
@@ -3,9 +3,9 @@ library from "org-dartlang-test:///lib.dart" as lib {
 
   import "dart:ffi";
 
-  @#C6
+  @#C7
   class Coordinate extends dart.ffi::Struct {
-    static final field dart.core::int* #sizeOf = (#C9).{dart.core::List::[]}(dart.ffi::_abi());
+    static final field dart.core::int* #sizeOf = (#C10).{dart.core::List::[]}(dart.ffi::_abi());
     @#C12
     constructor #fromTypedDataBase(dynamic #pointer) → dynamic
       : super dart.ffi::Struct::_fromPointer(#pointer)
@@ -54,14 +54,14 @@ constants  {
   #C2 = TypeLiteralConstant(dart.ffi::Double)
   #C3 = TypeLiteralConstant(dart.ffi::Pointer<dart.ffi::NativeType>)
   #C4 = <dart.core::Type>[#C2, #C2, #C3]
-  #C5 = dart.ffi::_FfiStructLayout {fieldTypes:#C4}
-  #C6 = dart.core::pragma {name:#C1, options:#C5}
-  #C7 = 24
-  #C8 = 20
-  #C9 = <dart.core::int*>[#C7, #C8, #C7]
-  #C10 = "vm:entry-point"
-  #C11 = null
-  #C12 = dart.core::pragma {name:#C10, options:#C11}
+  #C5 = null
+  #C6 = dart.ffi::_FfiStructLayout {fieldTypes:#C4, packing:#C5}
+  #C7 = dart.core::pragma {name:#C1, options:#C6}
+  #C8 = 24
+  #C9 = 20
+  #C10 = <dart.core::int*>[#C8, #C9, #C8]
+  #C11 = "vm:entry-point"
+  #C12 = dart.core::pragma {name:#C11, options:#C5}
   #C13 = 0
   #C14 = <dart.core::int*>[#C13, #C13, #C13]
   #C15 = 8

diff --git a/pkg/front_end/testcases/incremental/ffi_01.yaml.world.2.expect b/pkg/front_end/testcases/incremental/ffi_01.yaml.world.2.expect
@@ -3,9 +3,9 @@ library from "org-dartlang-test:///lib.dart" as lib {
 
   import "dart:ffi";
 
-  @#C6
+  @#C7
   class Coordinate extends dart.ffi::Struct {
-    static final field dart.core::int* #sizeOf = (#C9).{dart.core::List::[]}(dart.ffi::_abi());
+    static final field dart.core::int* #sizeOf = (#C10).{dart.core::List::[]}(dart.ffi::_abi());
     @#C12
     constructor #fromTypedDataBase(dynamic #pointer) → dynamic
       : super dart.ffi::Struct::_fromPointer(#pointer)
@@ -58,14 +58,14 @@ constants  {
   #C2 = TypeLiteralConstant(dart.ffi::Double)
   #C3 = TypeLiteralConstant(dart.ffi::Pointer<dart.ffi::NativeType>)
   #C4 = <dart.core::Type>[#C2, #C2, #C3]
-  #C5 = dart.ffi::_FfiStructLayout {fieldTypes:#C4}
-  #C6 = dart.core::pragma {name:#C1, options:#C5}
-  #C7 = 24
-  #C8 = 20
-  #C9 = <dart.core::int*>[#C7, #C8, #C7]
-  #C10 = "vm:entry-point"
-  #C11 = null
-  #C12 = dart.core::pragma {name:#C10, options:#C11}
+  #C5 = null
+  #C6 = dart.ffi::_FfiStructLayout {fieldTypes:#C4, packing:#C5}
+  #C7 = dart.core::pragma {name:#C1, options:#C6}
+  #C8 = 24
+  #C9 = 20
+  #C10 = <dart.core::int*>[#C8, #C9, #C8]
+  #C11 = "vm:entry-point"
+  #C12 = dart.core::pragma {name:#C11, options:#C5}
   #C13 = 0
   #C14 = <dart.core::int*>[#C13, #C13, #C13]
   #C15 = 8

diff --git a/pkg/front_end/testcases/incremental/ffi_02.yaml.world.1.expect b/pkg/front_end/testcases/incremental/ffi_02.yaml.world.1.expect
@@ -3,9 +3,9 @@ library from "org-dartlang-test:///lib.dart" as lib {
 
   import "dart:ffi";
 
-  @#C6
+  @#C7
   class Coordinate extends dart.ffi::Struct {
-    static final field dart.core::int* #sizeOf = (#C9).{dart.core::List::[]}(dart.ffi::_abi());
+    static final field dart.core::int* #sizeOf = (#C10).{dart.core::List::[]}(dart.ffi::_abi());
     @#C12
     constructor #fromTypedDataBase(dynamic #pointer) → dynamic
       : super dart.ffi::Struct::_fromPointer(#pointer)
@@ -55,14 +55,14 @@ constants  {
   #C2 = TypeLiteralConstant(dart.ffi::Double)
   #C3 = TypeLiteralConstant(dart.ffi::Pointer<dart.ffi::NativeType>)
   #C4 = <dart.core::Type>[#C2, #C2, #C3]
-  #C5 = dart.ffi::_FfiStructLayout {fieldTypes:#C4}
-  #C6 = dart.core::pragma {name:#C1, options:#C5}
-  #C7 = 24
-  #C8 = 20
-  #C9 = <dart.core::int*>[#C7, #C8, #C7]
-  #C10 = "vm:entry-point"
-  #C11 = null
-  #C12 = dart.core::pragma {name:#C10, options:#C11}
+  #C5 = null
+  #C6 = dart.ffi::_FfiStructLayout {fieldTypes:#C4, packing:#C5}
+  #C7 = dart.core::pragma {name:#C1, options:#C6}
+  #C8 = 24
+  #C9 = 20
+  #C10 = <dart.core::int*>[#C8, #C9, #C8]
+  #C11 = "vm:entry-point"
+  #C12 = dart.core::pragma {name:#C11, options:#C5}
   #C13 = 0
   #C14 = <dart.core::int*>[#C13, #C13, #C13]
   #C15 = 8

diff --git a/pkg/front_end/testcases/incremental/no_outline_change_35.yaml.world.1.expect b/pkg/front_end/testcases/incremental/no_outline_change_35.yaml.world.1.expect
@@ -3,9 +3,9 @@ library from "org-dartlang-test:///lib.dart" as lib {
 
   import "dart:ffi";
 
-  @#C6
+  @#C7
   class Coordinate extends dart.ffi::Struct {
-    static final field dart.core::int* #sizeOf = (#C9).{dart.core::List::[]}(dart.ffi::_abi());
+    static final field dart.core::int* #sizeOf = (#C10).{dart.core::List::[]}(dart.ffi::_abi());
     @#C12
     constructor #fromTypedDataBase(dynamic #pointer) → dynamic
       : super dart.ffi::Struct::_fromPointer(#pointer)
@@ -54,14 +54,14 @@ constants  {
   #C2 = TypeLiteralConstant(dart.ffi::Double)
   #C3 = TypeLiteralConstant(dart.ffi::Pointer<dart.ffi::NativeType>)
   #C4 = <dart.core::Type>[#C2, #C2, #C3]
-  #C5 = dart.ffi::_FfiStructLayout {fieldTypes:#C4}
-  #C6 = dart.core::pragma {name:#C1, options:#C5}
-  #C7 = 24
-  #C8 = 20
-  #C9 = <dart.core::int*>[#C7, #C8, #C7]
-  #C10 = "vm:entry-point"
-  #C11 = null
-  #C12 = dart.core::pragma {name:#C10, options:#C11}
+  #C5 = null
+  #C6 = dart.ffi::_FfiStructLayout {fieldTypes:#C4, packing:#C5}
+  #C7 = dart.core::pragma {name:#C1, options:#C6}
+  #C8 = 24
+  #C9 = 20
+  #C10 = <dart.core::int*>[#C8, #C9, #C8]
+  #C11 = "vm:entry-point"
+  #C12 = dart.core::pragma {name:#C11, options:#C5}
   #C13 = 0
   #C14 = <dart.core::int*>[#C13, #C13, #C13]
   #C15 = 8

diff --git a/pkg/front_end/testcases/incremental/no_outline_change_35.yaml.world.2.expect b/pkg/front_end/testcases/incremental/no_outline_change_35.yaml.world.2.expect
@@ -3,9 +3,9 @@ library from "org-dartlang-test:///lib.dart" as lib {
 
   import "dart:ffi";
 
-  @#C6
+  @#C7
   class Coordinate extends dart.ffi::Struct {
-    static final field dart.core::int* #sizeOf = (#C9).{dart.core::List::[]}(dart.ffi::_abi());
+    static final field dart.core::int* #sizeOf = (#C10).{dart.core::List::[]}(dart.ffi::_abi());
     @#C12
     constructor #fromTypedDataBase(dynamic #pointer) → dynamic
       : super dart.ffi::Struct::_fromPointer(#pointer)
@@ -55,14 +55,14 @@ constants  {
   #C2 = TypeLiteralConstant(dart.ffi::Double)
   #C3 = TypeLiteralConstant(dart.ffi::Pointer<dart.ffi::NativeType>)
   #C4 = <dart.core::Type>[#C2, #C2, #C3]
-  #C5 = dart.ffi::_FfiStructLayout {fieldTypes:#C4}
-  #C6 = dart.core::pragma {name:#C1, options:#C5}
-  #C7 = 24
-  #C8 = 20
-  #C9 = <dart.core::int*>[#C7, #C8, #C7]
-  #C10 = "vm:entry-point"
-  #C11 = null
-  #C12 = dart.core::pragma {name:#C10, options:#C11}
+  #C5 = null
+  #C6 = dart.ffi::_FfiStructLayout {fieldTypes:#C4, packing:#C5}
+  #C7 = dart.core::pragma {name:#C1, options:#C6}
+  #C8 = 24
+  #C9 = 20
+  #C10 = <dart.core::int*>[#C8, #C9, #C8]
+  #C11 = "vm:entry-point"
+  #C12 = dart.core::pragma {name:#C11, options:#C5}
   #C13 = 0
   #C14 = <dart.core::int*>[#C13, #C13, #C13]
   #C15 = 8

diff --git a/pkg/front_end/testcases/incremental/no_outline_change_35.yaml.world.3.expect b/pkg/front_end/testcases/incremental/no_outline_change_35.yaml.world.3.expect
@@ -3,9 +3,9 @@ library from "org-dartlang-test:///lib.dart" as lib {
 
   import "dart:ffi";
 
-  @#C6
+  @#C7
   class Coordinate extends dart.ffi::Struct {
-    static final field dart.core::int* #sizeOf = (#C9).{dart.core::List::[]}(dart.ffi::_abi());
+    static final field dart.core::int* #sizeOf = (#C10).{dart.core::List::[]}(dart.ffi::_abi());
     @#C12
     constructor #fromTypedDataBase(dynamic #pointer) → dynamic
       : super dart.ffi::Struct::_fromPointer(#pointer)
@@ -56,14 +56,14 @@ constants  {
   #C2 = TypeLiteralConstant(dart.ffi::Double)
   #C3 = TypeLiteralConstant(dart.ffi::Pointer<dart.ffi::NativeType>)
   #C4 = <dart.core::Type>[#C2, #C2, #C3]
-  #C5 = dart.ffi::_FfiStructLayout {fieldTypes:#C4}
-  #C6 = dart.core::pragma {name:#C1, options:#C5}
-  #C7 = 24
-  #C8 = 20
-  #C9 = <dart.core::int*>[#C7, #C8, #C7]
-  #C10 = "vm:entry-point"
-  #C11 = null
-  #C12 = dart.core::pragma {name:#C10, options:#C11}
+  #C5 = null
+  #C6 = dart.ffi::_FfiStructLayout {fieldTypes:#C4, packing:#C5}
+  #C7 = dart.core::pragma {name:#C1, options:#C6}
+  #C8 = 24
+  #C9 = 20
+  #C10 = <dart.core::int*>[#C8, #C9, #C8]
+  #C11 = "vm:entry-point"
+  #C12 = dart.core::pragma {name:#C11, options:#C5}
   #C13 = 0
   #C14 = <dart.core::int*>[#C13, #C13, #C13]
   #C15 = 8