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[llvm-objcopy] Implement -G/--keep-global-symbol(s).
Summary: Port GNU Objcopy -G/--keep-global-symbol(s). This is slightly different than the already-implemented --globalize-symbol, which marks a symbol as global when copying. When --keep-global-symbol (alias -G) is used, *only* those symbols marked will stay global, and all other globals are demoted to local. (Also note that it doesn't *promote* a symbol to global). Additionally, there is a pluralized version of the flag --keep-global-symbols, which effectively applies --keep-global-symbol for every non-comment in a file. Reviewers: jakehehrlich, jhenderson, alexshap Reviewed By: jhenderson Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D50589 llvm-svn: 340105
This commit is contained in:
Jordan Rupprecht
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@ -0,0 +1,51 @@
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# RUN: yaml2obj %s > %t.o
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# Tests --keep-global-symbol when used in combination with --globalize-symbol on
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# a different symbol.
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# RUN: llvm-objcopy \
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# RUN: --globalize-symbol Local1 \
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# RUN: --keep-global-symbol Local2 \
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# RUN: --globalize-symbol Weak1 \
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# RUN: --keep-global-symbol Weak2 \
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# RUN: --globalize-symbol Global1 \
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# RUN: --keep-global-symbol Global2 \
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# RUN: %t.o %t.2.o
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# RUN: llvm-readobj -elf-output-style=GNU -symbols %t.2.o | FileCheck %s
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!ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_REL
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Machine: EM_X86_64
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Sections:
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- Name: .text
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
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Symbols:
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Local:
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- Name: Local1
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Section: .text
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- Name: Local2
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Section: .text
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Weak:
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- Name: Weak1
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Section: .text
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- Name: Weak2
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Section: .text
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Global:
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- Name: Global1
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Section: .text
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- Name: Global2
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Section: .text
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# CHECK: Symbol table '.symtab' contains 7 entries:
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# CHECK-NEXT: Num: Value Size Type Bind Vis Ndx Name
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# CHECK-NEXT: 0: {{.*}} LOCAL {{.*}}
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# CHECK-NEXT: 1: {{.*}} LOCAL {{.*}} Local2
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# CHECK-NEXT: 2: {{.*}} GLOBAL {{.*}} Local1
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# CHECK-NEXT: 3: {{.*}} GLOBAL {{.*}} Global1
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# CHECK-NEXT: 4: {{.*}} GLOBAL {{.*}} Global2
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# CHECK-NEXT: 5: {{.*}} GLOBAL {{.*}} Weak1
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# CHECK-NEXT: 6: {{.*}} WEAK {{.*}} Weak2
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95
test/tools/llvm-objcopy/keep-global-symbols.test
Normal file
95
test/tools/llvm-objcopy/keep-global-symbols.test
Normal file
@ -0,0 +1,95 @@
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# RUN: yaml2obj %s > %t.o
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# Tests that only global symbols (via -G/--keep-global-symbols) are kept via
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# the several different variants of -G/--keep-global-symbol(s).
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#
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# Local1: Local because "-G Local1" doesn't make symbols global.
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# Local2: Global because of "--globalize-symbol Local2".
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# Weak1: Weak because "-G Weak1" doesn't make symbols global.
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# Weak2: Global because of "--globalize-symbol Weak2".
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# Weak3: Local because no -G flag covers it.
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# Global1: Global because of "-G Global1".
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# Global2: Global because of "--keep-global-symbol Global2".
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# Global3: Global because of "--keep-global-symbols %t-globals1.txt".
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# Global4: Global because of "--keep-global-symbols %t-globals2.txt".
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# Global5: Local, it appears in %t-globals2.txt but only in comments and as
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# part of another symbol
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# Global6: Local, it appears in %t-globals2.txt but only part of another symbol
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# "Global5 Global6": Global, because it appears in %t-globals2.txt, but we only
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# trim leading and trailing whitespace. We don't just take the first chunk
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# that looks like a symbol.
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# RUN: echo Global2 > %t-globals1.txt
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# RUN: echo " Global3 " > %t-globals2.txt
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# RUN: echo "Global4 # Global5" >> %t-globals2.txt
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# RUN: echo " Global5 Global6 " >> %t-globals2.txt
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# RUN: echo "Unknown" >> %t-globals2.txt
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# RUN: echo " " >> %t-globals2.txt
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# RUN: echo "# File with no symbols" > %t-globals3.txt
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# RUN: llvm-objcopy \
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# RUN: -G Global1 \
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# RUN: --keep-global-symbol Global2 \
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# RUN: --keep-global-symbols %t-globals1.txt \
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# RUN: --keep-global-symbols %t-globals2.txt \
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# RUN: -G Local1 \
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# RUN: --globalize-symbol Local2 \
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# RUN: -G Weak1 \
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# RUN: --globalize-symbol Weak2 \
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# RUN: %t.o %t.2.o
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# RUN: llvm-readobj -elf-output-style=GNU -symbols %t.2.o | FileCheck %s
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!ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_REL
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Machine: EM_X86_64
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Sections:
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- Name: .text
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
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Symbols:
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Local:
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- Name: Local1
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Section: .text
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- Name: Local2
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Section: .text
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Weak:
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- Name: Weak1
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Section: .text
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- Name: Weak2
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Section: .text
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- Name: Weak3
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Section: .text
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Global:
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- Name: Global1
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Section: .text
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- Name: Global2
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Section: .text
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- Name: Global3
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Section: .text
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- Name: Global4
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Section: .text
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- Name: Global5
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Section: .text
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- Name: Global6
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Section: .text
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- Name: "Global5 Global6"
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Section: .text
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# CHECK: Symbol table '.symtab' contains 13 entries:
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# CHECK-NEXT: Num: Value Size Type Bind Vis Ndx Name
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# CHECK-NEXT: 0: {{.*}} LOCAL {{.*}}
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# CHECK-NEXT: 1: {{.*}} LOCAL {{.*}} Local1
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# CHECK-NEXT: 2: {{.*}} LOCAL {{.*}} Global5
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# CHECK-NEXT: 3: {{.*}} LOCAL {{.*}} Global6
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# CHECK-NEXT: 4: {{.*}} LOCAL {{.*}} Weak3
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# CHECK-NEXT: 5: {{.*}} GLOBAL {{.*}} Local2
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# CHECK-NEXT: 6: {{.*}} GLOBAL {{.*}} Global1
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# CHECK-NEXT: 7: {{.*}} GLOBAL {{.*}} Global2
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# CHECK-NEXT: 8: {{.*}} GLOBAL {{.*}} Global3
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# CHECK-NEXT: 9: {{.*}} GLOBAL {{.*}} Global4
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# CHECK-NEXT: 10: {{.*}} GLOBAL {{.*}} Global5 Global6
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# CHECK-NEXT: 11: {{.*}} WEAK {{.*}} Weak1
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# CHECK-NEXT: 12: {{.*}} GLOBAL {{.*}} Weak2
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@ -81,6 +81,24 @@ def L : JoinedOrSeparate<["-"], "L">,
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defm globalize_symbol : Eq<"globalize-symbol">,
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MetaVarName<"symbol">,
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HelpText<"Mark <symbol> as global">;
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defm keep_global_symbol
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: Eq<"keep-global-symbol">,
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MetaVarName<"symbol">,
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HelpText<"Convert all symbols except <symbol> to local. May be repeated "
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"to convert all except a set of symbols to local.">;
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def G : JoinedOrSeparate<[ "-" ], "G">, Alias<keep_global_symbol>;
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defm keep_global_symbols
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: Eq<"keep-global-symbols">,
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MetaVarName<"filename">,
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HelpText<
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"Reads a list of symbols from <filename> and runs as if "
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"--keep-global-symbol=<symbol> is set for each one. <filename> "
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"contains one symbol per line and may contain comments beginning "
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"with '#'. Leading and trailing whitespace is stripped from each "
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"line. May be repeated to read symbols from many files.">;
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defm weaken_symbol : Eq<"weaken-symbol">,
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MetaVarName<"symbol">,
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HelpText<"Mark <symbol> as weak">;
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@ -154,6 +154,7 @@ struct CopyConfig {
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std::vector<StringRef> SymbolsToRemove;
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std::vector<StringRef> SymbolsToWeaken;
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std::vector<StringRef> ToRemove;
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std::vector<std::string> SymbolsToKeepGlobal;
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// Map options
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StringMap<SectionRename> SectionsToRename;
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@ -428,6 +429,20 @@ static void handleArgs(const CopyConfig &Config, Object &Obj,
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is_contained(Config.SymbolsToLocalize, Sym.Name)))
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Sym.Binding = STB_LOCAL;
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// Note: these two globalize flags have very similar names but different
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// meanings:
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//
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// --globalize-symbol: promote a symbol to global
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// --keep-global-symbol: all symbols except for these should be made local
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//
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// If --globalize-symbol is specified for a given symbol, it will be
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// global in the output file even if it is not included via
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// --keep-global-symbol. Because of that, make sure to check
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// --globalize-symbol second.
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if (!Config.SymbolsToKeepGlobal.empty() &&
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!is_contained(Config.SymbolsToKeepGlobal, Sym.Name))
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Sym.Binding = STB_LOCAL;
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if (!Config.SymbolsToGlobalize.empty() &&
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is_contained(Config.SymbolsToGlobalize, Sym.Name))
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Sym.Binding = STB_GLOBAL;
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@ -782,6 +797,23 @@ static void executeElfObjcopy(const CopyConfig &Config) {
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}
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}
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static void addGlobalSymbolsFromFile(std::vector<std::string> &Symbols,
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StringRef Filename) {
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SmallVector<StringRef, 16> Lines;
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auto BufOrErr = MemoryBuffer::getFile(Filename);
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if (!BufOrErr)
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reportError(Filename, BufOrErr.getError());
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BufOrErr.get()->getBuffer().split(Lines, '\n');
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for (StringRef Line : Lines) {
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// Ignore everything after '#', trim whitespace, and only add the symbol if
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// it's not empty.
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auto TrimmedLine = Line.split('#').first.trim();
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if (!TrimmedLine.empty())
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Symbols.push_back(TrimmedLine.str());
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}
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}
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// ParseObjcopyOptions returns the config and sets the input arguments. If a
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// help flag is set then ParseObjcopyOptions will print the help messege and
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// exit.
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@ -870,6 +902,10 @@ static CopyConfig parseObjcopyOptions(ArrayRef<const char *> ArgsArr) {
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Config.KeepFileSymbols = InputArgs.hasArg(OBJCOPY_keep_file_symbols);
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for (auto Arg : InputArgs.filtered(OBJCOPY_localize_symbol))
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Config.SymbolsToLocalize.push_back(Arg->getValue());
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for (auto Arg : InputArgs.filtered(OBJCOPY_keep_global_symbol))
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Config.SymbolsToKeepGlobal.push_back(Arg->getValue());
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for (auto Arg : InputArgs.filtered(OBJCOPY_keep_global_symbols))
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addGlobalSymbolsFromFile(Config.SymbolsToKeepGlobal, Arg->getValue());
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for (auto Arg : InputArgs.filtered(OBJCOPY_globalize_symbol))
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Config.SymbolsToGlobalize.push_back(Arg->getValue());
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for (auto Arg : InputArgs.filtered(OBJCOPY_weaken_symbol))
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