replica
/
hanchenye-llvm-project
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

[ELF] Linkerscript: support hidden symbols assignments 

This add support for HIDDEN command which can be used to define
a symbol that will be hidden and won't be exported.

Differential Revision: https://reviews.llvm.org/D23534

llvm-svn: 278770
This commit is contained in:
Petr Hosek 2016-08-16 01:11:16 +00:00
parent 1185b4ae8d
commit a35e39ca2e
2 changed files with 13 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
lld/ELF/LinkerScript.cpp
View File

@ -602,7 +602,7 @@ private:
InputSectionDescription *readInputSectionRules();
unsigned readPhdrType();
SortKind readSortKind();
SymbolAssignment *readProvide(bool Hidden);
SymbolAssignment *readProvideHidden(bool Provide, bool Hidden);
SymbolAssignment *readProvideOrAssignment(StringRef Tok);
Expr readAlign();
void readSort();
@ -969,10 +969,10 @@ std::vector<uint8_t> ScriptParser::readOutputSectionFiller() {
return { uint8_t(V >> 24), uint8_t(V >> 16), uint8_t(V >> 8), uint8_t(V) };
}
SymbolAssignment *ScriptParser::readProvide(bool Hidden) {
SymbolAssignment *ScriptParser::readProvideHidden(bool Provide, bool Hidden) {
expect("(");
SymbolAssignment *Cmd = readAssignment(next());
Cmd->Provide = true;
Cmd->Provide = Provide;
Cmd->Hidden = Hidden;
expect(")");
expect(";");
@ -985,9 +985,11 @@ SymbolAssignment *ScriptParser::readProvideOrAssignment(StringRef Tok) {
Cmd = readAssignment(Tok);
expect(";");
} else if (Tok == "PROVIDE") {
Cmd = readProvide(false);
Cmd = readProvideHidden(true, false);
} else if (Tok == "HIDDEN") {
Cmd = readProvideHidden(false, true);
} else if (Tok == "PROVIDE_HIDDEN") {
Cmd = readProvide(true);
Cmd = readProvideHidden(true, true);
}
return Cmd;
}

6
lld/test/ELF/linkerscript/linkerscript-symbols.s
View File

@ -35,6 +35,12 @@
# RUN: llvm-objdump -t %t1 | FileCheck --check-prefix=HIDDEN2 %s
# HIDDEN2: 0000000000000000 *ABS* 00000000 somesym
# Hidden symbol assignment.
# RUN: echo "SECTIONS { HIDDEN(newsym = 1);}" > %t.script
# RUN: ld.lld -o %t1 --script %t.script %t
# RUN: llvm-objdump -t %t1 | FileCheck --check-prefix=HIDDEN3 %s
# HIDDEN3: 0000000000000001 *ABS* 00000000 .hidden newsym
.global _start
_start:
nop