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[lld-link] implement -lto-obj-path

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Summary:
This adds the -lto-obj-path option to lld-link. This can be
used to specify a path at which to write a native object file for
the full LTO part when using LTO unit splitting.

Reviewers: ruiu, tejohnson, pcc, rnk

Reviewed By: ruiu, rnk

Subscribers: mehdi_amini, steven_wu, dexonsmith, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D65964

llvm-svn: 369559
This commit is contained in:
Bob Haarman 2019-08-21 18:24:59 +00:00
parent 969b3e6a8f
commit 5375b94e36
5 changed files with 34 additions and 0 deletions
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3
lld/COFF/Config.h
View file

@ -190,6 +190,9 @@ struct Configuration {
// Used for /thinlto-object-suffix-replace:
std::pair<llvm::StringRef, llvm::StringRef> thinLTOObjectSuffixReplace;
// Used for /lto-obj-path:
llvm::StringRef ltoObjPath;
uint64_t align = 4096;
uint64_t imageBase = -1;
uint64_t fileAlign = 512;

1
lld/COFF/Driver.cpp
View file

@ -1475,6 +1475,7 @@ void LinkerDriver::link(ArrayRef<const char *> argsArr) {
getOldNewOptions(args, OPT_thinlto_prefix_replace);
config->thinLTOObjectSuffixReplace =
getOldNewOptions(args, OPT_thinlto_object_suffix_replace);
config->ltoObjPath = args.getLastArgValue(OPT_lto_obj_path);
// Handle miscellaneous boolean flags.
config->allowBind = args.hasFlag(OPT_allowbind, OPT_allowbind_no, true);
config->allowIsolation =

2
lld/COFF/LTO.cpp
View file

@ -177,6 +177,8 @@ std::vector<StringRef> BitcodeCompiler::compile() {
// files. After that, we exit from linker and ThinLTO backend runs in a
// distributed environment.
if (config->thinLTOIndexOnly) {
if (!config->ltoObjPath.empty())
saveBuffer(buf[0], config->ltoObjPath);
if (indexFile)
indexFile->close();
return {};

3
lld/COFF/Options.td
View file

@ -191,6 +191,9 @@ def thinlto_object_suffix_replace : P<
def thinlto_prefix_replace: P<
"thinlto-prefix-replace",
"'old;new' replace old prefix with new prefix in ThinLTO outputs">;
def lto_obj_path : P<
"lto-obj-path",
"output native object for merged LTO unit to this path">;
def dash_dash_version : Flag<["--"], "version">,
HelpText<"Print version information">;
defm threads: B<"threads",

25
lld/test/COFF/lto-obj-path.ll Normal file
View file

@ -0,0 +1,25 @@
; REQUIRES: x86
; Test to ensure that thinlto-index-only with lto-obj-path creates
; the native object file.
; RUN: opt -module-summary %s -o %t1.obj
; RUN: opt -module-summary %p/Inputs/thinlto.ll -o %t2.obj
; RUN: rm -f %t4.obj
; RUN: lld-link -thinlto-index-only -lto-obj-path:%t4.obj -out:t3.exe \
; RUN: -entry:main %t1.obj %t2.obj
; RUN: llvm-readobj -h %t4.obj | FileCheck %s
; RUN: llvm-nm %t4.obj 2>&1 | FileCheck %s -check-prefix=SYMBOLS
; RUN: llvm-nm %t4.obj 2>&1 | count 1
; CHECK: Format: COFF-x86-64
; SYMBOLS: @feat.00
target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-windows-msvc19.0.24215"
declare void @g(...)
define void @main() {
call void (...) @g()
ret void
}