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add new JumpTableSpecialLabelPrefix hook to asmprinter for jumptable emission.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33314 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-01-18 01:12:56 +00:00
parent a10dc506c0
commit 393a8eea3c
3 changed files with 17 additions and 1 deletions
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7
include/llvm/Target/TargetAsmInfo.h
View File

@ -78,6 +78,10 @@ namespace llvm {
/// have names in the .o file. This is often "." or "L".
const char *PrivateGlobalPrefix; // Defaults to "."
/// JumpTableSpecialLabelPrefix - If not null, a extra (dead) label is
/// emitted before jump tables with the specified prefix.
const char *JumpTableSpecialLabelPrefix; // Default to null.
/// GlobalVarAddrPrefix/Suffix - If these are nonempty, these strings
/// will enclose any GlobalVariable (that isn't a function)
///
@ -343,6 +347,9 @@ namespace llvm {
const char *getPrivateGlobalPrefix() const {
return PrivateGlobalPrefix;
}
const char *getJumpTableSpecialLabelPrefix() const {
return JumpTableSpecialLabelPrefix;
}
const char *getGlobalVarAddrPrefix() const {
return GlobalVarAddrPrefix;
}

10
lib/CodeGen/AsmPrinter.cpp
View File

@ -244,6 +244,13 @@ void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
if (EmittedSets.insert(JTBBs[ii]).second)
printSetLabel(i, JTBBs[ii]);
// On some targets (e.g. darwin) we want to emit two consequtive labels
// before each jump table. The first label is never referenced, but tells
// the assembler and linker the extents of the jump table object. The
// second label is actually referenced by the code.
if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix())
O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n";
O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
<< '_' << i << ":\n";
@ -259,7 +266,8 @@ void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
<< '_' << i << "_set_" << JTBBs[ii]->getNumber();
} else if (IsPic) {
printBasicBlockLabel(JTBBs[ii], false, false);
//If the arch uses custom Jump Table directives, don't calc relative to JT
// If the arch uses custom Jump Table directives, don't calc relative to
// JT
if (!HadJTEntryDirective)
O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
<< getFunctionNumber() << '_' << i;

1
lib/Target/TargetAsmInfo.cpp
View File

@ -28,6 +28,7 @@ TargetAsmInfo::TargetAsmInfo() :
CommentString("#"),
GlobalPrefix(""),
PrivateGlobalPrefix("."),
JumpTableSpecialLabelPrefix(0),
GlobalVarAddrPrefix(""),
GlobalVarAddrSuffix(""),
FunctionAddrPrefix(""),