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[lld-macho] Add support for LTO optimization level 

Everything (including test) modified from ELF/COFF. Using the same syntax
(--lto-O3, etc) as ELF.

Differential Revision: https://reviews.llvm.org/D105223
This commit is contained in:
Leonard Grey 2021-07-01 15:01:59 -04:00 committed by Nico Weber
parent 33b579c8a5
commit fe08e9c487
4 changed files with 11 additions and 0 deletions
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1
lld/MachO/Config.h
View File

@ -126,6 +126,7 @@ struct Configuration {
llvm::StringRef outputFile;
llvm::StringRef ltoObjPath;
llvm::StringRef thinLTOJobs;
uint32_t ltoo = 2;
bool deadStripDylibs = false;
bool demangle = false;
bool deadStrip = false;

3
lld/MachO/Driver.cpp
View File

@ -1082,6 +1082,9 @@ bool macho::link(ArrayRef<const char *> argsArr, bool canExitEarly,
config->ltoNewPassManager =
args.hasFlag(OPT_no_lto_legacy_pass_manager, OPT_lto_legacy_pass_manager,
LLVM_ENABLE_NEW_PASS_MANAGER);
config->ltoo = args::getInteger(args, OPT_lto_O, 2);
if (config->ltoo > 3)
error("--lto-O: invalid optimization level: " + Twine(config->ltoo));
config->runtimePaths = args::getStrings(args, OPT_rpath);
config->allLoad = args.hasArg(OPT_all_load);
config->forceLoadObjC = args.hasArg(OPT_ObjC);

3
lld/MachO/LTO.cpp
View File

@ -13,6 +13,7 @@
#include "Symbols.h"
#include "Target.h"
#include "lld/Common/Args.h"
#include "lld/Common/ErrorHandler.h"
#include "lld/Common/Strings.h"
#include "lld/Common/TargetOptionsCommandFlags.h"
@ -40,6 +41,8 @@ static lto::Config createConfig() {
};
c.TimeTraceEnabled = config->timeTraceEnabled;
c.TimeTraceGranularity = config->timeTraceGranularity;
c.OptLevel = config->ltoo;
c.CGOptLevel = args::getCGOptLevel(config->ltoo);
if (config->saveTemps)
checkError(c.addSaveTemps(config->outputFile.str() + ".",
/*UseInputModulePath=*/true));

4
lld/MachO/Options.td
View File

@ -64,6 +64,10 @@ def icf_eq: Joined<["--"], "icf=">,
HelpText<"Set level for identical code folding (default: none)">,
MetaVarName<"[none,safe,all]">,
Group<grp_lld>;
def lto_O: Joined<["--"], "lto-O">,
HelpText<"Set optimization level for LTO (default: 2)">,
MetaVarName<"<opt-level>">,
Group<grp_lld>;
// This is a complete Options.td compiled from Apple's ld(1) manpage
// dated 2018-03-07 and cross checked with ld64 source code in repo