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[MSP430] Allow msp430_intrcc functions to not have interrupt attribute. 

Summary:
Useful in case you want to have control over interrupt vector generation.
For example in Rust language we have an arrangement where all unhandled
ISR vectors gets mapped to a single default handler function. Which is
hard to implement when LLVM tries to generate vectors on its own.

Reviewers: asl, krisb

Subscribers: hiraditya, JDevlieghere, awygle, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67313

llvm-svn: 372910
This commit is contained in:
Vadzim Dambrouski 2019-09-25 18:58:07 +00:00
parent af4a29af01
commit efcad77431
2 changed files with 14 additions and 3 deletions
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8
llvm/lib/Target/MSP430/MSP430AsmPrinter.cpp
View File

@ -159,8 +159,9 @@ void MSP430AsmPrinter::EmitInstruction(const MachineInstr *MI) {
void MSP430AsmPrinter::EmitInterruptVectorSection(MachineFunction &ISR) {
MCSection *Cur = OutStreamer->getCurrentSectionOnly();
const auto *F = &ISR.getFunction();
assert(F->hasFnAttribute("interrupt") &&
"Functions with MSP430_INTR CC should have 'interrupt' attribute");
if (F->getCallingConv() != CallingConv::MSP430_INTR) {
report_fatal_error("Functions with 'interrupt' attribute must have msp430_intrcc CC");
}
StringRef IVIdx = F->getFnAttribute("interrupt").getValueAsString();
MCSection *IV = OutStreamer->getContext().getELFSection(
"__interrupt_vector_" + IVIdx,
@ -174,8 +175,9 @@ void MSP430AsmPrinter::EmitInterruptVectorSection(MachineFunction &ISR) {
bool MSP430AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
// Emit separate section for an interrupt vector if ISR
if (MF.getFunction().getCallingConv() == CallingConv::MSP430_INTR)
if (MF.getFunction().hasFnAttribute("interrupt")) {
EmitInterruptVectorSection(MF);
}
SetupMachineFunction(MF);
EmitFunctionBody();

9
llvm/test/CodeGen/MSP430/interrupt.ll
View File

@ -50,4 +50,13 @@ entry:
ret void
}
; Functions without 'interrupt' attribute don't get a vector section.
; CHECK-NOT: __interrupt_vector
; CHECK-LABEL: NMI:
; CHECK: reti
define msp430_intrcc void @NMI() #1 {
ret void
}
attributes #0 = { noinline nounwind optnone "interrupt"="2" }
attributes #1 = { noinline nounwind optnone }