tejohnson created this revision.
Herald added a subscriber: Prazek.
Clang companion patch to LLVM patch https://reviews.llvm.org/D31027, which adds
support
for emitting minimized bitcode file for use in the thin link step.
Add a cc1 option -fthin-link-bitcode=<file> to trigger this behavior.
Depends on https://reviews.llvm.org/D31027.
https://reviews.llvm.org/D31050
Files:
include/clang/Driver/CC1Options.td
include/clang/Frontend/CodeGenOptions.h
lib/CodeGen/BackendUtil.cpp
lib/Frontend/CompilerInvocation.cpp
test/CodeGen/thin_link_bitcode.c
Index: test/CodeGen/thin_link_bitcode.c
===================================================================
--- /dev/null
+++ test/CodeGen/thin_link_bitcode.c
@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 -o %t -flto=thin -fthin-link-bitcode=%t.nodebug -triple
x86_64-unknown-linux-gnu -emit-llvm-bc -debug-info-kind=limited %s
+// RUN: llvm-bcanalyzer -dump %t | FileCheck %s
+// RUN: llvm-bcanalyzer -dump %t.nodebug | FileCheck %s --check-prefix=NO_DEBUG
+int main (void) {
+ return 0;
+}
+
+// CHECK: COMPILE_UNIT
+// NO_DEBUG-NOT: COMPILE_UNIT
Index: lib/Frontend/CompilerInvocation.cpp
===================================================================
--- lib/Frontend/CompilerInvocation.cpp
+++ lib/Frontend/CompilerInvocation.cpp
@@ -641,6 +641,7 @@
<< A->getAsString(Args) << "-x ir";
Opts.ThinLTOIndexFile = Args.getLastArgValue(OPT_fthinlto_index_EQ);
}
+ Opts.ThinLinkBitcodeFile = Args.getLastArgValue(OPT_fthin_link_bitcode_EQ);
Opts.MSVolatile = Args.hasArg(OPT_fms_volatile);
Index: lib/CodeGen/BackendUtil.cpp
===================================================================
--- lib/CodeGen/BackendUtil.cpp
+++ lib/CodeGen/BackendUtil.cpp
@@ -688,7 +688,8 @@
case Backend_EmitBC:
if (CodeGenOpts.EmitSummaryIndex)
- PerModulePasses.add(createWriteThinLTOBitcodePass(*OS));
+ PerModulePasses.add(
+ createWriteThinLTOBitcodePass(*OS, CodeGenOpts.ThinLinkBitcodeFile));
else
PerModulePasses.add(
createBitcodeWriterPass(*OS, CodeGenOpts.EmitLLVMUseLists));
Index: include/clang/Frontend/CodeGenOptions.h
===================================================================
--- include/clang/Frontend/CodeGenOptions.h
+++ include/clang/Frontend/CodeGenOptions.h
@@ -186,6 +186,11 @@
/// importing.
std::string ThinLTOIndexFile;
+ /// Name of a file that can optionally be written with minimized bitcode
+ /// to be used as input for the ThinLTO thin link step, which only needs
+ /// the summary and module symbol table (and not, e.g. any debug metadata).
+ std::string ThinLinkBitcodeFile;
+
/// A list of file names passed with -fcuda-include-gpubinary options to
/// forward to CUDA runtime back-end for incorporating them into host-side
/// object file.
Index: include/clang/Driver/CC1Options.td
===================================================================
--- include/clang/Driver/CC1Options.td
+++ include/clang/Driver/CC1Options.td
@@ -312,6 +312,8 @@
def flto_unit: Flag<["-"], "flto-unit">,
HelpText<"Emit IR to support LTO unit features (CFI, whole program vtable
opt)">;
def fno_lto_unit: Flag<["-"], "fno-lto-unit">;
+def fthin_link_bitcode_EQ : Joined<["-"], "fthin-link-bitcode=">,
+ HelpText<"Write minimized bitcode to <file> for the ThinLTO thin link
only">;
//===----------------------------------------------------------------------===//
// Dependency Output Options
Index: test/CodeGen/thin_link_bitcode.c
===================================================================
--- /dev/null
+++ test/CodeGen/thin_link_bitcode.c
@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 -o %t -flto=thin -fthin-link-bitcode=%t.nodebug -triple x86_64-unknown-linux-gnu -emit-llvm-bc -debug-info-kind=limited %s
+// RUN: llvm-bcanalyzer -dump %t | FileCheck %s
+// RUN: llvm-bcanalyzer -dump %t.nodebug | FileCheck %s --check-prefix=NO_DEBUG
+int main (void) {
+ return 0;
+}
+
+// CHECK: COMPILE_UNIT
+// NO_DEBUG-NOT: COMPILE_UNIT
Index: lib/Frontend/CompilerInvocation.cpp
===================================================================
--- lib/Frontend/CompilerInvocation.cpp
+++ lib/Frontend/CompilerInvocation.cpp
@@ -641,6 +641,7 @@
<< A->getAsString(Args) << "-x ir";
Opts.ThinLTOIndexFile = Args.getLastArgValue(OPT_fthinlto_index_EQ);
}
+ Opts.ThinLinkBitcodeFile = Args.getLastArgValue(OPT_fthin_link_bitcode_EQ);
Opts.MSVolatile = Args.hasArg(OPT_fms_volatile);
Index: lib/CodeGen/BackendUtil.cpp
===================================================================
--- lib/CodeGen/BackendUtil.cpp
+++ lib/CodeGen/BackendUtil.cpp
@@ -688,7 +688,8 @@
case Backend_EmitBC:
if (CodeGenOpts.EmitSummaryIndex)
- PerModulePasses.add(createWriteThinLTOBitcodePass(*OS));
+ PerModulePasses.add(
+ createWriteThinLTOBitcodePass(*OS, CodeGenOpts.ThinLinkBitcodeFile));
else
PerModulePasses.add(
createBitcodeWriterPass(*OS, CodeGenOpts.EmitLLVMUseLists));
Index: include/clang/Frontend/CodeGenOptions.h
===================================================================
--- include/clang/Frontend/CodeGenOptions.h
+++ include/clang/Frontend/CodeGenOptions.h
@@ -186,6 +186,11 @@
/// importing.
std::string ThinLTOIndexFile;
+ /// Name of a file that can optionally be written with minimized bitcode
+ /// to be used as input for the ThinLTO thin link step, which only needs
+ /// the summary and module symbol table (and not, e.g. any debug metadata).
+ std::string ThinLinkBitcodeFile;
+
/// A list of file names passed with -fcuda-include-gpubinary options to
/// forward to CUDA runtime back-end for incorporating them into host-side
/// object file.
Index: include/clang/Driver/CC1Options.td
===================================================================
--- include/clang/Driver/CC1Options.td
+++ include/clang/Driver/CC1Options.td
@@ -312,6 +312,8 @@
def flto_unit: Flag<["-"], "flto-unit">,
HelpText<"Emit IR to support LTO unit features (CFI, whole program vtable opt)">;
def fno_lto_unit: Flag<["-"], "fno-lto-unit">;
+def fthin_link_bitcode_EQ : Joined<["-"], "fthin-link-bitcode=">,
+ HelpText<"Write minimized bitcode to <file> for the ThinLTO thin link only">;
//===----------------------------------------------------------------------===//
// Dependency Output Options
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