friendlyelec

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build	…
c2hal	…
hashing	…
hidl2aidl	…
host_utils	…
lint	…
metadata	…
scripts	…
test	…
utils	…
.clang-format	…
AST.cpp	…
AST.h	…
Android.bp	…
Annotation.cpp	…
Annotation.h	…
ArrayType.cpp	…
ArrayType.h	…
CleanSpec.mk	…
CompoundType.cpp	…
CompoundType.h	…
ConstantExpression.cpp	…
ConstantExpression.h	…
Coordinator.cpp	…
Coordinator.h	…
DeathRecipientType.cpp	…
DeathRecipientType.h	…
DocComment.cpp	…
DocComment.h	…
EnumType.cpp	…
EnumType.h	…
FmqType.cpp	…
FmqType.h	…
FormattingConstants.h	…
HandleType.cpp	…
HandleType.h	…
HidlTypeAssertion.cpp	…
HidlTypeAssertion.h	…
Interface.cpp	…
Interface.h	…
Location.cpp	…
Location.h	…
MemoryType.cpp	…
MemoryType.h	…
Method.cpp	…
Method.h	…
NOTICE	…
NamedType.cpp	…
NamedType.h	…
OWNERS	…
PREUPLOAD.cfg	…
PointerType.cpp	…
PointerType.h	…
README.md	…
Reference.h	…
ScalarType.cpp	…
ScalarType.h	…
Scope.cpp	…
Scope.h	…
StringType.cpp	…
StringType.h	…
TEST_MAPPING	…
Type.cpp	…
Type.h	…
TypeDef.cpp	…
TypeDef.h	…
VectorType.cpp	…
VectorType.h	…
generateCpp.cpp	…
generateCppAdapter.cpp	…
generateCppImpl.cpp	…
generateDependencies.cpp	…
generateFormattedHidl.cpp	…
generateInheritanceHierarchy.cpp	…
generateJava.cpp	…
generateJavaImpl.cpp	…
generateVts.cpp	…
hidl-gen_l.h	…
hidl-gen_l.ll	…
hidl-gen_y-helpers.h	…
hidl-gen_y.yy	…
main.cpp	…
update-all-google-makefiles.sh	…
update-makefiles-helper.sh	…

README.md

hidl-gen

Full documentation can be found here: https://source.android.com/devices/architecture/hidl/

hidl-gen is a compiler for the HIDL (HAL Interface Design Language) which generates C++ and Java endpoints for RPC mechanisms. The main userspace libraries which this compiler uses can be found at system/libhidl.

1. Build

m hidl-gen

2. Run

Note that options for hidl-gen expected to be invoked by the build system are marked with 'internal' in the help menu.

hidl-gen -h

hidl-gen -o output -L c++-impl -r android.hardware:hardware/interfaces -r android.hidl:system/libhidl/transport android.hardware.nfc@1.0

Some defaults for package roots are also provided

hidl-gen -o output -L c++-impl android.hardware.nfc@1.0
hidl-gen -o output -L vts android.hardware.nfc@1.0
hidl-gen -L hash android.hardware.nfc@1.0

Example command for vendor project

hidl-gen -L c++-impl -r vendor.foo:vendor/foo/interfaces vendor.foo.nfc@1.0

See update-makefiles-helper.sh and update-all-google-makefiles.sh for examples of how to generate HIDL makefiles (using the -Landroidbp option).

NOTE: When using the -Landroidbp option, you can force generated modules to be installed in /system_ext rather than other partition by putting a marker file .hidl_for_system_ext alongside *.hal files.

NOTE: You can also install the vendor variant of the generated modules to be installed in /odm rather than /vendor by putting a marker file .hidl_for_odm alongside *.hal files.

c2hal

This is a helper tool to convert C headers to valid .hal files.

m c2hal && c2hal -h