[PATCH] D39919: [llvm-objcopy] Add --strip-debug
Jake Ehrlich via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri Nov 10 13:01:49 PST 2017
jakehehrlich created this revision.
Many projects use this option. There are two ways to use it. You can either a) Just use --strip-debug and keep the old file with debug content or b) you can use --strip-debug, --only-keep-debug, and --add-gnu-debuglink all in conjunction to create two separate files, the stripped file and the debug file. --only-keep-debug is more complicated than --strip-debug because it keeps the section headers without keeping section contents. That's not really supported by llvm-objcopy at the moment but I plan on adding it. So this change just supports a) and options to support b) will come soon.
Repository:
rL LLVM
https://reviews.llvm.org/D39919
Files:
test/tools/llvm-objcopy/strip-debug.test
tools/llvm-objcopy/llvm-objcopy.cpp
Index: tools/llvm-objcopy/llvm-objcopy.cpp
===================================================================
--- tools/llvm-objcopy/llvm-objcopy.cpp
+++ tools/llvm-objcopy/llvm-objcopy.cpp
@@ -81,6 +81,8 @@
cl::desc("Remove a specific section"));
static cl::alias ToRemoveA("R", cl::desc("Alias for remove-section"),
cl::aliasopt(ToRemove));
+static cl::opt<bool> StripDebug("strip-debug",
+ cl::desc("Removes all debug information"));
static cl::opt<bool> StripSections("strip-sections",
cl::desc("Remove all section headers"));
static cl::opt<bool>
@@ -177,6 +179,12 @@
Obj->WriteSectionHeaders = false;
}
+ if (StripDebug) {
+ RemovePred = [RemovePred](const SectionBase &Sec) {
+ return RemovePred(Sec) || Sec.Name.startswith(".debug");
+ };
+ }
+
Obj->removeSections(RemovePred);
Obj->finalize();
WriteObjectFile(*Obj, OutputFilename.getValue());
Index: test/tools/llvm-objcopy/strip-debug.test
===================================================================
--- /dev/null
+++ test/tools/llvm-objcopy/strip-debug.test
@@ -0,0 +1,54 @@
+# RUN: yaml2obj %s > %t
+# RUN: llvm-objcopy -strip-debug %t %t2
+# RUN: llvm-readobj -file-headers -sections -symbols %t2 | FileCheck %s
+
+!ELF
+FileHeader:
+ Class: ELFCLASS64
+ Data: ELFDATA2LSB
+ Type: ET_REL
+ Machine: EM_X86_64
+Sections:
+ - Name: .debugfoo
+ Type: SHT_PROGBITS
+ Content: "00000000"
+ - Name: .text
+ Type: SHT_PROGBITS
+ Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
+ AddressAlign: 0x0000000000000010
+ Content: "00000000"
+Symbols:
+ Global:
+ - Name: foo
+ Section: .text
+ - Name: debugfoo
+ Section: .debugfoo
+
+# CHECK: SectionHeaderCount: 5
+
+# CHECK: Name: .text
+# CHECK: Name: .symtab
+# CHECK: Name: .strtab
+# CHECK: Name: .shstrtab
+
+# Check that *only* foo is copied and not debugfoo
+# CHECK: Symbols [
+# CHECK-NEXT: Symbol {
+# CHECK-NEXT: Name:
+# CHECK-NEXT: Value:
+# CHECK-NEXT: Size:
+# CHECK-NEXT: Binding:
+# CHECK-NEXT: Type:
+# CHECK-NEXT: Other:
+# CHECK-NEXT: Section: Undefined
+# CHECK-NEXT: }
+# CHECK-NEXT: Symbol {
+# CHECK-NEXT: Name: foo
+# CHECK-NEXT: Value:
+# CHECK-NEXT: Size:
+# CHECK-NEXT: Binding: Global
+# CHECK-NEXT: Type:
+# CHECK-NEXT: Other:
+# CHECK-NEXT: Section: .text
+# CHECK-NEXT: }
+# CHECK-NEXT: ]
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