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Avoid unnecessary string construction during asm printing.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53215 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-07-08 00:55:58 +00:00
parent 82eec45b00
commit 77c8f7674d
4 changed files with 36 additions and 15 deletions
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1
include/llvm/CodeGen/AsmPrinter.h
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@ -351,6 +351,7 @@ namespace llvm {
/// printSuffixedName - This prints a name with preceding
/// getPrivateGlobalPrefix and the specified suffix, handling quoted names
/// correctly.
void printSuffixedName(const char *Name, const char* Suffix);
void printSuffixedName(std::string &Name, const char* Suffix);
private:

10
lib/CodeGen/AsmPrinter.cpp
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@ -1377,7 +1377,7 @@ void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
O << ':';
if (printComment && MBB->getBasicBlock())
O << '\t' << TAI->getCommentString() << ' '
<< MBB->getBasicBlock()->getName();
<< MBB->getBasicBlock()->getNameStart();
}
/// printPICJumpTableSetLabel - This method prints a set label for the
@ -1445,10 +1445,14 @@ void AsmPrinter::printDataDirective(const Type *type) {
}
}
void AsmPrinter::printSuffixedName(std::string &Name, const char* Suffix) {
void AsmPrinter::printSuffixedName(const char *Name, const char* Suffix) {
if (Name[0]=='\"')
O << '\"' << TAI->getPrivateGlobalPrefix() <<
Name.substr(1, Name.length()-2) << Suffix << '\"';
Name[1] << Suffix << '\"';
else
O << TAI->getPrivateGlobalPrefix() << Name << Suffix;
}
void AsmPrinter::printSuffixedName(std::string &Name, const char* Suffix) {
printSuffixedName(Name.c_str(), Suffix);
}

38
lib/Target/X86/X86ATTAsmPrinter.cpp
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@ -974,6 +974,16 @@ void X86ATTAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
EmitGlobalConstant(C);
}
/// printGVStub - Print stub for a global value.
///
void X86ATTAsmPrinter::printGVStub(const char *GV, const char *Prefix) {
if (Prefix) O << Prefix;
printSuffixedName(GV, "$non_lazy_ptr");
O << ":\n\t.indirect_symbol ";
if (Prefix) O << Prefix;
O << GV << "\n\t.long\t0\n";
}
bool X86ATTAsmPrinter::doFinalization(Module &M) {
// Print out module-level global variables here.
@ -1012,7 +1022,7 @@ bool X86ATTAsmPrinter::doFinalization(Module &M) {
i != e; ++i, ++j) {
SwitchToDataSection("\t.section __IMPORT,__jump_table,symbol_stubs,"
"self_modifying_code+pure_instructions,5", 0);
std::string p = i->getKeyData();
const char *p = i->getKeyData();
printSuffixedName(p, "$stub");
O << ":\n"
"\t.indirect_symbol " << p << "\n"
@ -1021,28 +1031,32 @@ bool X86ATTAsmPrinter::doFinalization(Module &M) {
O << '\n';
// Print global value stubs.
bool InStubSection = false;
if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
// Add the (possibly multiple) personalities to the set of global values.
// Only referenced functions get into the Personalities list.
const std::vector<Function *>& Personalities = MMI->getPersonalities();
for (std::vector<Function *>::const_iterator I = Personalities.begin(),
E = Personalities.end(); I != E; ++I)
if (*I) GVStubs.insert('_' + (*I)->getName());
E = Personalities.end(); I != E; ++I) {
if (!*I)
continue;
if (!InStubSection) {
SwitchToDataSection(
"\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
InStubSection = true;
}
printGVStub((*I)->getNameStart(), "_");
}
}
// Output stubs for external and common global variables.
if (!GVStubs.empty())
if (!InStubSection && !GVStubs.empty())
SwitchToDataSection(
"\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
for (StringSet<>::iterator i = GVStubs.begin(), e = GVStubs.end();
i != e; ++i) {
std::string p = i->getKeyData();
printSuffixedName(p, "$non_lazy_ptr");
O << ":\n"
"\t.indirect_symbol " << p << "\n"
"\t.long\t0\n";
}
i != e; ++i)
printGVStub(i->getKeyData());
// Emit final debug information.
DW.EndModule();

2
lib/Target/X86/X86ATTAsmPrinter.h
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@ -120,6 +120,8 @@ struct VISIBILITY_HIDDEN X86ATTAsmPrinter : public AsmPrinter {
void printPICLabel(const MachineInstr *MI, unsigned Op);
void printModuleLevelGV(const GlobalVariable* GVar);
void printGVStub(const char *GV, const char *Prefix = NULL);
bool runOnMachineFunction(MachineFunction &F);
/// getSectionForFunction - Return the section that we should emit the