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Do not strip llvm.used values.

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llvm-svn: 46045
This commit is contained in:
Devang Patel 2008-01-16 03:33:05 +00:00
parent 9b2d0769ed
commit a8d63b0b30
3 changed files with 43 additions and 3 deletions
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28
lib/Transforms/IPO/StripSymbols.cpp
View File

@ -29,6 +29,7 @@
#include "llvm/ValueSymbolTable.h"
#include "llvm/TypeSymbolTable.h"
#include "llvm/Support/Compiler.h"
#include "llvm/ADT/SmallPtrSet.h"
using namespace llvm;
namespace {
@ -100,13 +101,34 @@ bool StripSymbols::runOnModule(Module &M) {
// If we're not just stripping debug info, strip all symbols from the
// functions and the names from any internal globals.
if (!OnlyDebugInfo) {
SmallPtrSet<const Constant *, 8> llvmUsedValues;
Value *LLVMUsed = M.getValueSymbolTable().lookup("llvm.used");
if (LLVMUsed) {
// Collect values that are preserved as per explicit request.
// llvm.used is used to list these values.
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(LLVMUsed)) {
if (ConstantArray *InitList =
dyn_cast<ConstantArray>(GV->getInitializer())) {
for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
if (ConstantExpr *CE =
dyn_cast<ConstantExpr>(InitList->getOperand(i)))
if (CE->isCast())
llvmUsedValues.insert(CE->getOperand(0));
}
}
}
}
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I)
if (I->hasInternalLinkage())
I != E; ++I) {
if (I->hasInternalLinkage() && llvmUsedValues.count(I) == 0)
I->setName(""); // Internal symbols can't participate in linkage
else if (I->getName() == "llvm.used") {
}
}
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
if (I->hasInternalLinkage())
if (I->hasInternalLinkage() && llvmUsedValues.count(I) == 0)
I->setName(""); // Internal symbols can't participate in linkage
StripSymtab(I->getValueSymbolTable());
}

15
test/Transforms/StripSymbols/2007-01-15-llvm.used.ll Normal file
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@ -0,0 +1,15 @@
; RUN: llvm-as < %s | opt -strip | llvm-dis | grep foo | count 2
; RUN: llvm-as < %s | opt -strip | llvm-dis | grep bar | count 2
@llvm.used = appending global [2 x i8*] [ i8* bitcast (i32* @foo to i8*), i8* bitcast (i32 ()* @bar to i8*) ], section "llvm.metadata" ; <[2 x i8*]*> [#uses=0]
@foo = internal constant i32 41 ; <i32*> [#uses=1]
define internal i32 @bar() nounwind {
entry:
ret i32 42
}
define i32 @main() nounwind {
entry:
ret i32 0
}

3
test/Transforms/StripSymbols/dg.exp Normal file
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@ -0,0 +1,3 @@
load_lib llvm.exp
RunLLVMTests [lsort [glob -nocomplain $srcdir/$subdir/*.{ll,llx,c,cpp,tr}]]