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Thumb assemmbly parsing diagnostic improvements for LDM.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138287 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2011-08-22 23:01:07 +00:00
parent d937d95125
commit 7260c6a4ea
2 changed files with 14 additions and 4 deletions
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14
lib/Target/ARM/AsmParser/ARMAsmParser.cpp
View File

@ -3084,6 +3084,9 @@ validateInstruction(MCInst &Inst,
// Thumb LDM instructions are writeback iff the base register is not
// in the register list.
unsigned Rn = Inst.getOperand(0).getReg();
bool hasWritebackToken =
(static_cast<ARMOperand*>(Operands[3])->isToken() &&
static_cast<ARMOperand*>(Operands[3])->getToken() == "!");
bool doesWriteback = true;
for (unsigned i = 3; i < Inst.getNumOperands(); ++i) {
unsigned Reg = Inst.getOperand(i).getReg();
@ -3091,15 +3094,18 @@ validateInstruction(MCInst &Inst,
doesWriteback = false;
// Anything other than a low register isn't legal here.
if (!isARMLowRegister(Reg))
return Error(Operands[4]->getStartLoc(),
return Error(Operands[3 + hasWritebackToken]->getStartLoc(),
"registers must be in range r0-r7");
}
// If we should have writeback, then there should be a '!' token.
if (doesWriteback &&
(!static_cast<ARMOperand*>(Operands[3])->isToken() ||
static_cast<ARMOperand*>(Operands[3])->getToken() != "!"))
if (doesWriteback && !hasWritebackToken)
return Error(Operands[2]->getStartLoc(),
"writeback operator '!' expected");
// Likewise, if we should not have writeback, there must not be a '!'
if (!doesWriteback && hasWritebackToken)
return Error(Operands[3]->getStartLoc(),
"writeback operator '!' not allowed when base register "
"in register list");
break;
}

4
test/MC/ARM/thumb-diagnostics.s
View File

@ -45,12 +45,16 @@ error: invalid operand for instruction
@ Invalid writeback and register lists for LDM
ldm r2!, {r5, r8}
ldm r2, {r5, r7}
ldm r2!, {r2, r3, r4}
@ CHECK-ERRORS: error: registers must be in range r0-r7
@ CHECK-ERRORS: ldm r2!, {r5, r8}
@ CHECK-ERRORS: ^
@ CHECK-ERRORS: error: writeback operator '!' expected
@ CHECK-ERRORS: ldm r2, {r5, r7}
@ CHECK-ERRORS: ^
@ CHECK-ERRORS: error: writeback operator '!' not allowed when base register in register list
@ CHECK-ERRORS: ldm r2!, {r2, r3}
@ CHECK-ERRORS: ^
@ Out of range immediates for LSL instruction.