mirror of
https://github.com/Gericom/teak-llvm.git
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c8e0bb3b2c
Summary: This adds support for embedding bitcode in a binary during LTO. The libLTO gains supports the `-lto-embed-bitcode` flag. The option allows users of the LTO library to embed a bitcode section. For example, LLD can pass the option via `ld.lld -mllvm=-lto-embed-bitcode`. This feature allows doing something comparable to `clang -c -fembed-bitcode`, but on the (LTO) linker level. Having bitcode alongside native code has many use-cases. To give an example, the MacOS linker can create a `-bitcode_bundle` section containing bitcode. Also, having this feature built into LLVM is an alternative to 3rd party tools such as [[ https://github.com/travitch/whole-program-llvm | wllvm ]] or [[ https://github.com/SRI-CSL/gllvm | gllvm ]]. As with these tools, this feature simplifies creating "whole-program" llvm bitcode files, but in contrast to wllvm/gllvm it does not rely on a specific llvm frontend/driver. Patch by Josef Eisl <josef.eisl@oracle.com> Reviewers: #llvm, #clang, rsmith, pcc, alexshap, tejohnson Reviewed By: tejohnson Subscribers: tejohnson, mehdi_amini, inglorion, hiraditya, aheejin, steven_wu, dexonsmith, dang, cfe-commits, llvm-commits, #llvm, #clang Tags: #clang, #llvm Differential Revision: https://reviews.llvm.org/D68213
75 lines
2.9 KiB
LLVM
75 lines
2.9 KiB
LLVM
; REQUIRES: x86-registered-target
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; check .ll input
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; RUN: %clang_cc1 -triple x86_64-apple-macosx10.10 -emit-llvm \
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; RUN: -fembed-bitcode=all -x ir %s -o - \
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; RUN: | FileCheck %s
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; RUN: %clang_cc1 -triple x86_64-apple-macosx10.10 -emit-llvm \
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; RUN: -fembed-bitcode=marker -x ir %s -o - \
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; RUN: | FileCheck %s -check-prefix=CHECK-MARKER
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; RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -emit-llvm \
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; RUN: -fembed-bitcode=all -x ir %s -o - \
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; RUN: | FileCheck %s -check-prefix=CHECK-ELF
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; RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -emit-llvm \
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; RUN: -fembed-bitcode=marker -x ir %s -o - \
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; RUN: | FileCheck %s -check-prefix=CHECK-ELF-MARKER
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; RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -emit-llvm \
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; RUN: -fembed-bitcode=bitcode -x ir %s -o - \
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; RUN: | FileCheck %s -check-prefix=CHECK-ELF-ONLY-BITCODE
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; check .bc input
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; RUN: %clang_cc1 -triple x86_64-apple-macosx10.10 -emit-llvm-bc \
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; RUN: -x ir %s -o %t.bc
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; RUN: %clang_cc1 -triple x86_64-apple-macosx10.10 -emit-llvm \
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; RUN: -fembed-bitcode=all -x ir %t.bc -o - \
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; RUN: | FileCheck %s
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; RUN: %clang_cc1 -triple x86_64-apple-macosx10.10 -emit-llvm \
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; RUN: -fembed-bitcode=bitcode -x ir %t.bc -o - \
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; RUN: | FileCheck %s -check-prefix=CHECK-ONLY-BITCODE
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; RUN: %clang_cc1 -triple x86_64-apple-macosx10.10 -emit-llvm \
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; RUN: -fembed-bitcode=marker -x ir %t.bc -o - \
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; RUN: | FileCheck %s -check-prefix=CHECK-MARKER
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; run through -fembed-bitcode twice and make sure it doesn't crash
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; RUN: %clang_cc1 -triple x86_64-apple-macosx10.10 -emit-llvm-bc \
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; RUN: -fembed-bitcode=all -x ir %s -o - \
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; RUN: | %clang_cc1 -triple x86_64-apple-macosx10.10 -emit-llvm \
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; RUN: -fembed-bitcode=all -x ir - -o /dev/null
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; check the magic number of bitcode at the beginning of the string
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; CHECK: @llvm.embedded.module = private constant
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; CHECK: c"\DE\C0\17\0B
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; CHECK: section "__LLVM,__bitcode"
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; CHECK: @llvm.cmdline = private constant
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; CHECK: section "__LLVM,__cmdline"
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; CHECK-ELF: @llvm.embedded.module
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; CHECK-ELF: section ".llvmbc"
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; CHECK-ELF: @llvm.cmdline
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; CHECK-ELF: section ".llvmcmd"
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; CHECK-ELF-MARKER: @llvm.embedded.module
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; CHECK-ELF-MARKER: constant [0 x i8] zeroinitializer
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; CHECK-ELF-MARKER: @llvm.cmdline
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; CHECK-ELF-MARKER: section ".llvmcmd"
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; CHECK-ELF-ONLY-BITCODE: @llvm.embedded.module
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; CHECK-ELF-ONLY-BITCODE: section ".llvmbc"
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; CHECK-ELF-ONLY-BITCODE-NOT: @llvm.cmdline
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; CHECK-ELF-ONLY-BITCODE-NOT: section ".llvmcmd"
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; CHECK-ONLY-BITCODE: @llvm.embedded.module = private constant
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; CHECK-ONLY-BITCODE: c"\DE\C0\17\0B
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; CHECK-ONLY-BITCODE: section "__LLVM,__bitcode"
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; CHECK-ONLY-BITCODE-NOT: @llvm.cmdline = private constant
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; CHECK-ONLY-BITCODE-NOT: section "__LLVM,__cmdline"
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; CHECK-MARKER: @llvm.embedded.module
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; CHECK-MARKER: constant [0 x i8] zeroinitializer
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; CHECK-MARKER: section "__LLVM,__bitcode"
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; CHECK-MARKER: @llvm.cmdline
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; CHECK-MARKER: section "__LLVM,__cmdline"
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define i32 @f0() {
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ret i32 0
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}
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