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[PR] Introduce remove-symtab option 

Summary:
This patch introduces remove-symtab option to be able to skip emitting
symtab section in the final binary.
Also this patch adds ".zdebug_*" (compressed debug section) in the list
of debug section names.

Vladislav Khmelevsky,
Advanced Software Technology Lab, Huawei

(cherry picked from FBD31738239)
This commit is contained in:
Vladislav Khmelevsky 2021-10-16 17:02:45 +03:00 committed by Maksim Panchenko
parent 10088a1e15
commit 95ee12977b
1 changed files with 14 additions and 2 deletions
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16
bolt/src/RewriteInstance.cpp
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@ -356,6 +356,10 @@ EnableBAT("enable-bat",
cl::ZeroOrMore,
cl::cat(BoltCategory));
cl::opt<bool> RemoveSymtab("remove-symtab", cl::desc("Remove .symtab section"),
cl::init(false), cl::ZeroOrMore,
cl::cat(BoltCategory));
static cl::opt<bool>
UseGnuStack("use-gnu-stack",
cl::desc("use GNU_STACK program header for new segment (workaround for "
@ -4200,6 +4204,10 @@ bool RewriteInstance::shouldStrip(const ELFShdrTy &Section,
if (isDebugSection(SectionName) && !opts::UpdateDebugSections)
return true;
// Strip symtab section if needed
if (opts::RemoveSymtab && Section.sh_type == ELF::SHT_SYMTAB)
return true;
return false;
}
@ -4837,6 +4845,9 @@ void RewriteInstance::patchELFSymTabs(ELFObjectFile<ELFT> *File) {
[](StringRef) -> size_t { return 0; });
}
if (opts::RemoveSymtab)
return;
// (re)create regular symbol table.
const ELFShdrTy *SymTabSection = nullptr;
for (const ELFShdrTy &Section : cantFail(Obj.sections())) {
@ -5434,8 +5445,9 @@ bool RewriteInstance::willOverwriteSection(StringRef SectionName) {
}
bool RewriteInstance::isDebugSection(StringRef SectionName) {
if (SectionName.startswith(".debug_") || SectionName == ".gdb_index" ||
SectionName == ".stab" || SectionName == ".stabstr")
if (SectionName.startswith(".debug_") || SectionName.startswith(".zdebug_") ||
SectionName == ".gdb_index" || SectionName == ".stab" ||
SectionName == ".stabstr")
return true;
return false;