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Avoid symbol name clash when filling TOC.

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Patch by Adhemerval Zanella.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164141 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Roman Divacky 2012-09-18 17:10:37 +00:00
parent 371d5d86bd
commit f145c135f3
4 changed files with 42 additions and 3 deletions
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1
include/llvm/MC/MCContext.h
View File

@ -183,6 +183,7 @@ namespace llvm {
/// LookupSymbol - Get the symbol for \p Name, or null.
MCSymbol *LookupSymbol(StringRef Name) const;
MCSymbol *LookupSymbol(const Twine &Name) const;
/// getSymbols - Get a reference for the symbol table for clients that
/// want to, for example, iterate over all symbols. 'const' because we

6
lib/MC/MCContext.cpp
View File

@ -153,6 +153,12 @@ MCSymbol *MCContext::LookupSymbol(StringRef Name) const {
return Symbols.lookup(Name);
}
MCSymbol *MCContext::LookupSymbol(const Twine &Name) const {
SmallString<128> NameSV;
Name.toVector(NameSV);
return LookupSymbol(NameSV.str());
}
//===----------------------------------------------------------------------===//
// Section Management
//===----------------------------------------------------------------------===//

11
lib/Target/PowerPC/PPCAsmPrinter.cpp
View File

@ -368,9 +368,14 @@ void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
else if (MO.isJTI())
MOSymbol = GetJTISymbol(MO.getIndex());
MCSymbol *&TOCEntry = TOC[MOSymbol];
if (TOCEntry == 0)
TOCEntry = GetTempSymbol("C", TOCLabelID++);
// To avoid name clash check if the name already exists.
while (TOCEntry == 0) {
if (OutContext.LookupSymbol(Twine(MAI->getPrivateGlobalPrefix()) +
"C" + Twine(TOCLabelID++)) == 0) {
TOCEntry = GetTempSymbol("C", TOCLabelID);
}
}
const MCExpr *Exp =
MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC_ENTRY,
OutContext);

27
test/CodeGen/PowerPC/2012-09-16-TOC-entry-check.ll Normal file
View File

@ -0,0 +1,27 @@
; RUN: llc < %s | FileCheck %s
target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32:64"
target triple = "powerpc64-unknown-linux-gnu"
; This test check if the TOC entry symbol name won't clash with global .LC0
; and .LC2 symbols defined in the module.
@.LC0 = internal global [5 x i8] c".LC0\00"
@.LC2 = internal global [5 x i8] c".LC2\00"
define i32 @foo(double %X, double %Y) nounwind readnone {
; The 1.0 and 3.0 constants generate two TOC entries
%cmp = fcmp oeq double %X, 1.000000e+00
%conv = zext i1 %cmp to i32
%cmp1 = fcmp oeq double %Y, 3.000000e+00
%conv2 = zext i1 %cmp1 to i32
%add = add nsw i32 %conv2, %conv
ret i32 %add
}
; Check the creation of 2 .tc entries for both double constants. They
; should be .LC1 and .LC3 to avoid name clash with global constants
; .LC0 and .LC2
; CHECK: .LC{{[13]}}:
; CHECK-NEXT: .tc {{[\._a-zA-Z0-9]+}}[TC],{{[\._a-zA-Z0-9]+}}
; CHECK: .LC{{[13]}}:
; CHECK-NEXT: .tc {{[\._a-zA-Z0-9]+}}[TC],{{[\._a-zA-Z0-9]+}}