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Make this more efficient of the common case where we are only mangling globals.

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Do not mangle internal global names that do not collide with anything.

This gives us strings that now look like this:

__2E_str_1:                             ; '.str_1'
        .asciz  "foo"

instead of this:

l1__2E_str_1:                           ; '.str_1'
        .asciz  "foo"


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24277 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-11-10 18:48:58 +00:00
parent a112e0f447
commit 9ddf21276e
1 changed files with 28 additions and 29 deletions
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57
lib/VMCore/Mangler.cpp
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@ -12,8 +12,8 @@
//===----------------------------------------------------------------------===//
#include "llvm/Support/Mangler.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/Type.h"
#include "llvm/ADT/StringExtras.h"
using namespace llvm;
@ -59,40 +59,39 @@ unsigned Mangler::getTypeID(const Type *Ty) {
return E;
}
std::string Mangler::getValueName(const Value *V) {
if (const GlobalValue *GV = dyn_cast<GlobalValue>(V))
return getValueName(GV);
std::string &Name = Memo[V];
if (!Name.empty())
return Name; // Return the already-computed name for V.
// Always mangle local names.
Name = "ltmp_" + utostr(Count++) + "_" + utostr(getTypeID(V->getType()));
return Name;
}
std::string Mangler::getValueName(const GlobalValue *GV) {
// Check to see whether we've already named V.
ValueMap::iterator VI = Memo.find(V);
if (VI != Memo.end()) {
return VI->second; // Return the old name for V.
}
std::string &Name = Memo[GV];
if (!Name.empty())
return Name; // Return the already-computed name for V.
std::string name;
if (V->hasName()) { // Print out the label if it exists...
// Name mangling occurs as follows:
// - If V is an intrinsic function, do not change name at all
// - If V is not a global, mangling always occurs.
// - Otherwise, mangling occurs when any of the following are true:
// 1) V has internal linkage
// 2) V's name would collide if it is not mangled.
//
const GlobalValue* gv = dyn_cast<GlobalValue>(V);
if (gv && isa<Function>(gv) && cast<Function>(gv)->getIntrinsicID()) {
name = gv->getName(); // Is an intrinsic function
} else if (gv && !gv->hasInternalLinkage() && !MangledGlobals.count(gv)) {
name = makeNameProper(gv->getName(), Prefix);
} else {
// Non-global, or global with internal linkage / colliding name
// -> mangle.
unsigned TypeUniqueID = getTypeID(V->getType());
name = "l" + utostr(TypeUniqueID) + "_" + makeNameProper(V->getName());
}
// Name mangling occurs as follows:
// - If V is an intrinsic function, do not change name at all
// - Otherwise, mangling occurs if global collides with existing name.
if (isa<Function>(GV) && cast<Function>(GV)->getIntrinsicID()) {
Name = GV->getName(); // Is an intrinsic function
} else if (!MangledGlobals.count(GV)) {
Name = makeNameProper(GV->getName(), Prefix);
} else {
name = "ltmp_" + utostr(Count++) + "_" + utostr(getTypeID(V->getType()));
unsigned TypeUniqueID = getTypeID(GV->getType());
Name = "l" + utostr(TypeUniqueID) + "_" + makeNameProper(GV->getName());
}
Memo[V] = name;
return name;
return Name;
}
void Mangler::InsertName(GlobalValue *GV,