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[CIR][CIRGen] Fixes function calls with return values and cleanup stage #1214

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Dec 17, 2024
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[CIR][CIRGen] Fixes function calls with return values and cleanup stage #1214

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6bf3852
[CIR][CIRGen] fixes functions calls with ret values and cleanup stage
gitoleg Dec 6, 2024
c78799e
adds helper function
gitoleg Dec 10, 2024
24b91c6
clang-format ...
gitoleg Dec 10, 2024
6846da4
minor
gitoleg Dec 13, 2024
526fc86
fixed tests
gitoleg Dec 13, 2024
21369d8
typo fixed
gitoleg Dec 13, 2024
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23 changes: 23 additions & 0 deletions clang/lib/CIR/CodeGen/CIRGenCall.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -551,6 +551,17 @@ static cir::CIRCallOpInterface emitCallLikeOp(
extraFnAttrs);
}

static RValue getRValueThroughMemory(mlir::Location loc,
CIRGenBuilderTy &builder, mlir::Value val,
Address addr) {
auto ip = builder.saveInsertionPoint();
builder.setInsertionPointAfterValue(val);
builder.createStore(loc, val, addr);
builder.restoreInsertionPoint(ip);
auto load = builder.createLoad(loc, addr);
return RValue::get(load);
}

RValue CIRGenFunction::emitCall(const CIRGenFunctionInfo &CallInfo,
const CIRGenCallee &Callee,
ReturnValueSlot ReturnValue,
Expand Down Expand Up @@ -889,6 +900,18 @@ RValue CIRGenFunction::emitCall(const CIRGenFunctionInfo &CallInfo,
auto Results = theCall->getOpResults();
assert(Results.size() <= 1 && "multiple returns NYI");
assert(Results[0].getType() == RetCIRTy && "Bitcast support NYI");

auto region = builder.getBlock()->getParent();
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if (region != theCall->getParentRegion()) {
Address DestPtr = ReturnValue.getValue();

if (!DestPtr.isValid())
DestPtr = CreateMemTemp(RetTy, callLoc, "tmp");
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return getRValueThroughMemory(callLoc, builder, Results[0],
DestPtr);
}
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return RValue::get(Results[0]);
}
default:
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31 changes: 31 additions & 0 deletions clang/test/CIR/CodeGen/try-catch-dtors.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -308,3 +308,34 @@ void yo2(bool x) {
// CIR: } catch [type #cir.all {
// CIR: cir.catch_param -> !cir.ptr<!void>
// CIR: }]


int foo() { return 42; }

struct A {
~A() {}
};

void bar() {
A a;
int b = foo();
}

// CIR-LABEL: @_Z3barv
// CIR: %[[V0:.*]] = cir.alloca !ty_A, !cir.ptr<!ty_A>, ["a"] {alignment = 1 : i64}
// CIR: %[[V1:.*]] = cir.alloca !s32i, !cir.ptr<!s32i>, ["b", init] {alignment = 4 : i64}
// CIR: %[[V2:.*]] = cir.alloca !s32i, !cir.ptr<!s32i>, ["tmp"] {alignment = 4 : i64}
// CIR: cir.try synthetic cleanup {
// CIR: %[[V4:.*]] = cir.call exception @_Z3foov() : () -> !s32i cleanup {
// CIR: cir.call @_ZN1AD2Ev(%[[V0]]) : (!cir.ptr<!ty_A>) -> () extra(#fn_attr)
// CIR: cir.yield
// CIR: }
// CIR: cir.store %[[V4]], %[[V2]] : !s32i, !cir.ptr<!s32i>
// CIR: cir.yield
// CIR: } catch [#cir.unwind {
// CIR: cir.resume
// CIR: }]
// CIR: %[[V3:.*]] = cir.load %[[V2]] : !cir.ptr<!s32i>, !s32i
// CIR: cir.store %[[V3]], %[[V1]] : !s32i, !cir.ptr<!s32i>
// CIR: cir.call @_ZN1AD2Ev(%[[V0]]) : (!cir.ptr<!ty_A>) -> () extra(#fn_attr)
// CIR: cir.return
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