From 68f29dac4be8a9fc31533263c308252934d50a05 Mon Sep 17 00:00:00 2001 From: Puyan Lotfi Date: Thu, 20 Jun 2019 16:59:48 +0000 Subject: [clang-ifs] Clang Interface Stubs, first version (second landing attempt). This change reverts r363649; effectively re-landing r363626. At this point clang::Index::CodegenNameGeneratorImpl has been refactored into clang::AST::ASTNameGenerator. This makes it so that the previous circular link dependency no longer exists, fixing the previous share lib (-DBUILD_SHARED_LIBS=ON) build issue which was the reason for r363649. Clang interface stubs (previously referred to as clang-ifsos) is a new frontend action in clang that allows the generation of stub files that contain mangled name info that can be used to produce a stub library. These stub libraries can be useful for breaking up build dependencies and controlling access to a library's internal symbols. Generation of these stubs can be invoked by: clang -fvisibility= -emit-interface-stubs \ -interface-stub-version= Notice that -fvisibility (along with use of visibility attributes) can be used to control what symbols get generated. Currently the interface format is experimental but there are a wide range of possibilities here. Currently clang-ifs produces .ifs files that can be thought of as analogous to object (.o) files, but just for the mangled symbol info. In a subsequent patch I intend to add support for merging the .ifs files into one .ifs/.ifso file that can be the input to something like llvm-elfabi to produce something like a .so file or .dll (but without any of the code, just symbols). Differential Revision: https://reviews.llvm.org/D60974 llvm-svn: 363948 --- clang/test/InterfaceStubs/object.cpp | 13 +++++++++++++ 1 file changed, 13 insertions(+) create mode 100644 clang/test/InterfaceStubs/object.cpp (limited to 'clang/test/InterfaceStubs/object.cpp') diff --git a/clang/test/InterfaceStubs/object.cpp b/clang/test/InterfaceStubs/object.cpp new file mode 100644 index 00000000000..68b5ee781c9 --- /dev/null +++ b/clang/test/InterfaceStubs/object.cpp @@ -0,0 +1,13 @@ +// RUN: %clang -target x86_64-unknown-linux-gnu -o - -emit-interface-stubs \ +// RUN: -interface-stub-version=experimental-tapi-elf-v1 %s | \ +// RUN: FileCheck -check-prefix=CHECK-TAPI %s + +// RUN: %clang -target x86_64-unknown-linux-gnu -o - -emit-interface-stubs \ +// RUN: -interface-stub-version=experimental-tapi-elf-v1 %s | \ +// RUN: FileCheck -check-prefix=CHECK-SYMBOLS %s +// RUN: %clang -target x86_64-unknown-linux-gnu -o - -c %s | llvm-nm - 2>&1 | \ +// RUN: FileCheck -check-prefix=CHECK-SYMBOLS %s + +// CHECK-TAPI: data: { Type: Object, Size: 4 } +// CHECK-SYMBOLS: data +int data = 42; -- cgit v1.2.3