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Mips assembler: Improve set register alias handling

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This patch solves the problem of numeric register values not being accepted:

../set_alias.s:1:11: error: expected valid expression after comma
        .set    r4,$4
                    ^
The parsing of .set directive is changed and handling of symbols in code 
as well to enable this feature. 

The test example is added.

Patch by Vladimir Medic


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182807 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jack Carter 2013-05-28 22:21:05 +00:00
parent 86b2473c21
commit c57905ef4d
2 changed files with 31 additions and 7 deletions
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33
lib/Target/Mips/AsmParser/MipsAsmParser.cpp
View File

@ -20,6 +20,7 @@
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCTargetAsmParser.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/ADT/APInt.h"
using namespace llvm;
@ -1290,8 +1291,16 @@ bool MipsAsmParser::searchSymbolAlias(
const MCSymbolRefExpr *Ref = static_cast<const MCSymbolRefExpr*>(Expr);
const StringRef DefSymbol = Ref->getSymbol().getName();
if (DefSymbol.startswith("$")) {
// Lookup for the register with the corresponding name.
int RegNum = matchRegisterName(DefSymbol.substr(1), isMips64());
int RegNum = -1;
APInt IntVal(32, -1);
if (!DefSymbol.substr(1).getAsInteger(10, IntVal))
RegNum = matchRegisterByNumber(IntVal.getZExtValue(),
isMips64()
? Mips::CPU64RegsRegClassID
: Mips::CPURegsRegClassID);
else
// Lookup for the register with corresponding name
RegNum = matchRegisterName(DefSymbol.substr(1), isMips64());
if (RegNum > -1) {
Parser.Lex();
MipsOperand *op = MipsOperand::CreateReg(RegNum, S,
@ -1305,7 +1314,7 @@ bool MipsAsmParser::searchSymbolAlias(
Parser.Lex();
const MCConstantExpr *Const = static_cast<const MCConstantExpr*>(Expr);
MipsOperand *op = MipsOperand::CreateImm(Const, S,
Parser.getTok().getLoc());
Parser.getTok().getLoc());
Operands.push_back(op);
return true;
}
@ -1741,8 +1750,22 @@ bool MipsAsmParser::parseSetAssignment() {
return reportParseError("unexpected token in .set directive");
Lex(); // Eat comma
if (Parser.parseExpression(Value))
reportParseError("expected valid expression after comma");
if (getLexer().is(AsmToken::Dollar)) {
MCSymbol *Symbol;
SMLoc DollarLoc = getLexer().getLoc();
// Consume the dollar sign, and check for a following identifier.
Parser.Lex();
// We have a '$' followed by something, make sure they are adjacent.
if (DollarLoc.getPointer() + 1 != getTok().getLoc().getPointer())
return true;
StringRef Res = StringRef(DollarLoc.getPointer(),
getTok().getEndLoc().getPointer() - DollarLoc.getPointer());
Symbol = getContext().GetOrCreateSymbol(Res);
Parser.Lex();
Value = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_None,
getContext());
} else if (Parser.parseExpression(Value))
return reportParseError("expected valid expression after comma");
// Check if the Name already exists as a symbol.
MCSymbol *Sym = getContext().LookupSymbol(Name);

5
test/MC/Mips/mips_directives.s
View File

@ -37,7 +37,8 @@ $JTI0_0:
.set at=$a0
.set STORE_MASK,$t7
.set FPU_MASK,$f7
.set r3,$3
#CHECK: abs.s $f6, $f7 # encoding: [0x46,0x00,0x39,0x85]
#CHECK: and $3, $15, $15 # encoding: [0x01,0xef,0x18,0x24]
abs.s $f6,FPU_MASK
and $3,$t7,STORE_MASK
abs.s $f6,FPU_MASK
and r3,$t7,STORE_MASK