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Better diagnostics when inline asm fails to allocate.

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asm.c:2:7: error: ran out of registers during register allocation
  asm(""::"r"(0), "r"(1), "r"(2), "r"(3), "r"(4), "r"(5), "r"(6), "r"(7), "r"(8), "r"(9));
        ^

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134310 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-07-02 07:17:37 +00:00
parent a9badd250c
commit 9d812a2805
3 changed files with 20 additions and 26 deletions
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26
lib/CodeGen/RegAllocBasic.cpp
View File

@ -324,19 +324,21 @@ void RegAllocBase::allocatePhysRegs() {
if (AvailablePhysReg == ~0u) {
// selectOrSplit failed to find a register!
std::string msg;
raw_string_ostream Msg(msg);
Msg << "Ran out of registers during register allocation!"
"\nCannot allocate: " << *VirtReg;
const char *Msg = "ran out of registers during register allocation";
// Probably caused by an inline asm.
MachineInstr *MI;
for (MachineRegisterInfo::reg_iterator I = MRI->reg_begin(VirtReg->reg);
MachineInstr *MI = I.skipInstruction();) {
if (!MI->isInlineAsm())
continue;
Msg << "\nPlease check your inline asm statement for "
"invalid constraints:\n";
MI->print(Msg, &VRM->getMachineFunction().getTarget());
}
report_fatal_error(Msg.str());
(MI = I.skipInstruction());)
if (MI->isInlineAsm())
break;
if (MI)
MI->emitError(Msg);
else
report_fatal_error(Msg);
// Keep going after reporting the error.
VRM->assignVirt2Phys(VirtReg->reg,
RegClassInfo.getOrder(MRI->getRegClass(VirtReg->reg)).front());
continue;
}
if (AvailablePhysReg)

14
lib/CodeGen/RegAllocFast.cpp
View File

@ -530,16 +530,10 @@ void RAFast::allocVirtReg(MachineInstr *MI, LiveRegEntry &LRE, unsigned Hint) {
return assignVirtToPhysReg(LRE, BestReg);
}
// Nothing we can do.
std::string msg;
raw_string_ostream Msg(msg);
Msg << "Ran out of registers during register allocation!";
if (MI->isInlineAsm()) {
Msg << "\nPlease check your inline asm statement for "
<< "invalid constraints:\n";
MI->print(Msg, TM);
}
report_fatal_error(Msg.str());
// Nothing we can do. Report an error and keep going with a bad allocation.
MI->emitError("ran out of registers during register allocation");
definePhysReg(MI, *AO.begin(), regFree);
assignVirtToPhysReg(LRE, *AO.begin());
}
/// defineVirtReg - Allocate a register for VirtReg and mark it as dirty.

6
test/CodeGen/X86/inline-asm-error.ll
View File

@ -5,10 +5,8 @@
; RUN: FileCheck %s < %t2
; RUN: FileCheck %s < %t3
; The register allocator must fail on this function, and it should print the
; inline asm in the diagnostic.
; CHECK: LLVM ERROR: Ran out of registers during register allocation!
; CHECK: INLINEASM <es:hello world>
; The register allocator must fail on this function.
; CHECK: error: ran out of registers during register allocation
define void @f(i32 %x0, i32 %x1, i32 %x2, i32 %x3, i32 %x4, i32 %x5, i32 %x6, i32 %x7, i32 %x8, i32 %x9) nounwind ssp {
entry: