[PATCH] D62976: [LLD] [COFF] Add an lld specific option /includeoptional
Martin Storsjö via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu Jun 6 13:04:16 PDT 2019
mstorsjo created this revision.
mstorsjo added reviewers: ruiu, rnk, pcc.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.
This works like /include, but is not fatal if the requested symbol wasn't found. This allows implementing the GNU ld option -u.
Repository:
rLLD LLVM Linker
https://reviews.llvm.org/D62976
Files:
COFF/Config.h
COFF/Driver.cpp
COFF/Options.td
COFF/SymbolTable.cpp
test/COFF/includeoptional.yaml
Index: test/COFF/includeoptional.yaml
===================================================================
--- /dev/null
+++ test/COFF/includeoptional.yaml
@@ -0,0 +1,39 @@
+# RUN: yaml2obj < %s > %t.main.obj
+# RUN: yaml2obj < %p/Inputs/include1c.yaml > %t.lib.obj
+# RUN: rm -f %t.lib.lib
+# RUN: llvm-ar cru %t.lib.lib %t.lib.obj
+# RUN: lld-link /out:%t.exe /entry:main /includeoptional:bar /includeoptional:actuallymissing %t.main.obj %t.lib.lib /verbose >& %t.log
+# RUN: FileCheck %s < %t.log
+
+# CHECK: includeoptional.yaml.tmp.main.obj
+# CHECK: includeoptional.yaml.tmp.lib.lib
+# CHECK: includeoptional.yaml.tmp.lib.lib(includeoptional.yaml.tmp.lib.obj) for bar
+--- !COFF
+header:
+ Machine: IMAGE_FILE_MACHINE_AMD64
+ Characteristics: []
+sections:
+ - Name: .text
+ Characteristics: [ IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ ]
+ Alignment: 4
+ SectionData: B800000000506800000000680000000050E80000000050E800000000
+symbols:
+ - Name: .text
+ Value: 0
+ SectionNumber: 1
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_STATIC
+ SectionDefinition:
+ Length: 28
+ NumberOfRelocations: 4
+ NumberOfLinenumbers: 0
+ CheckSum: 0
+ Number: 0
+ - Name: main
+ Value: 0
+ SectionNumber: 1
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_EXTERNAL
+...
Index: COFF/SymbolTable.cpp
===================================================================
--- COFF/SymbolTable.cpp
+++ COFF/SymbolTable.cpp
@@ -243,6 +243,9 @@
if (Config->MinGW && handleMinGWAutomaticImport(Sym, Name))
continue;
+ if (Config->AllowUnresolved.count(Name))
+ continue;
+
// Remaining undefined symbols are not fatal if /force is specified.
// They are replaced with dummy defined symbols.
if (Config->ForceUnresolved)
Index: COFF/Options.td
===================================================================
--- COFF/Options.td
+++ COFF/Options.td
@@ -167,6 +167,8 @@
defm demangle : B<"demangle",
"Demangle symbols in output (default)",
"Do not demangle symbols in output">;
+def incl_optional : Joined<["/", "-", "/?", "-?"], "includeoptional:">,
+ HelpText<"Add symbol as undefined, but allow it to remain undefined">;
def kill_at : F<"kill-at">;
def lldmingw : F<"lldmingw">;
def output_def : Joined<["/", "-", "/?", "-?"], "output-def:">;
Index: COFF/Driver.cpp
===================================================================
--- COFF/Driver.cpp
+++ COFF/Driver.cpp
@@ -1251,6 +1251,12 @@
for (auto *Arg : Args.filtered(OPT_incl))
addUndefined(Arg->getValue());
+ // Handle /includeoptional
+ for (auto *Arg : Args.filtered(OPT_incl_optional)) {
+ addUndefined(Arg->getValue());
+ Config->AllowUnresolved.insert(Arg->getValue());
+ }
+
// Handle /implib
if (auto *Arg = Args.getLastArg(OPT_implib))
Config->Implib = Arg->getValue();
Index: COFF/Config.h
===================================================================
--- COFF/Config.h
+++ COFF/Config.h
@@ -122,6 +122,7 @@
bool DLL = false;
StringRef Implib;
std::vector<Export> Exports;
+ std::set<std::string> AllowUnresolved;
std::set<std::string> DelayLoads;
std::map<std::string, int> DLLOrder;
Symbol *DelayLoadHelper = nullptr;
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