127bf44385
This completes the implementation of P1091R3 and P1381R1. This patch allow the capture of structured bindings both for C++20+ and C++17, with extension/compat warning. In addition, capturing an anonymous union member, a bitfield, or a structured binding thereof now has a better diagnostic. We only support structured bindings - as opposed to other kinds of structured statements/blocks. We still emit an error for those. In addition, support for structured bindings capture is entirely disabled in OpenMP mode as this needs more investigation - a specific diagnostic indicate the feature is not yet supported there. Note that the rest of P1091R3 (static/thread_local structured bindings) was already implemented. at the request of @shafik, i can confirm the correct behavior of lldb wit this change. Fixes https://github.com/llvm/llvm-project/issues/54300 Fixes https://github.com/llvm/llvm-project/issues/54300 Fixes https://github.com/llvm/llvm-project/issues/52720 Reviewed By: aaron.ballman Differential Revision: https://reviews.llvm.org/D122768
49 lines
1.9 KiB
C++
49 lines
1.9 KiB
C++
// RUN: %clang_cc1 -std=c++20 -triple x86_64-linux-gnu -emit-llvm %s -o - | FileCheck %s
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struct S {
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int i;
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int j;
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};
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int f() {
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auto [i, j] = S{1, 42};
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return [&i, j] {
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return i + j;
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}();
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}
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// Ensures the representation of the lambda, the order of the
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// 1st 2nd don't matter except for ABI-esque things, but make sure
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// that the ref-capture is a ptr, and 'j' is captured by value.
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// CHECK: %[[LAMBDA_TY:.+]] = type <{ ptr, i32, [4 x i8] }>
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// Check the captures themselves.
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// CHECK: define{{.*}} i32 @_Z1fv()
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// CHECK: %[[BINDING:.+]] = alloca %struct.S
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// CHECK: %[[LAMBDA:.+]] = alloca %[[LAMBDA_TY]]
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// Copy a pointer to the binding, for reference capture.
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// CHECK: %[[LAMBDA_CAP_PTR:.+]] = getelementptr inbounds %[[LAMBDA_TY]], ptr %[[LAMBDA]], i32 0, i32 0
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// CHECK: %[[BINDING_PTR:.+]] = getelementptr inbounds %struct.S, ptr %[[BINDING]], i32 0, i32 0
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// CHECK: store ptr %[[BINDING_PTR]], ptr %[[LAMBDA_CAP_PTR]]
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// Copy the integer from the binding, for copy capture.
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// CHECK: %[[LAMBDA_CAP_INT:.+]] = getelementptr inbounds %[[LAMBDA_TY]], ptr %[[LAMBDA]], i32 0, i32 1
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// CHECK: %[[PTR_TO_J:.+]] = getelementptr inbounds %struct.S, ptr %[[BINDING]], i32 0, i32 1
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// CHECK: %[[J_COPY:.+]] = load i32, ptr %[[PTR_TO_J]]
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// CHECK: store i32 %[[J_COPY]], ptr %[[LAMBDA_CAP_INT]]
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// Ensure the captures are properly extracted in operator().
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// CHECK: define{{.*}} i32 @"_ZZ1fvENK3$_0clEv"
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// CHECK: %[[THIS_ADDR:.+]] = alloca ptr
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// CHECK: %[[THIS_PTR:.+]] = load ptr, ptr %[[THIS_ADDR]]
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// Load 'i', passed by reference.
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// CHECK: %[[LAMBDA_GEP_TO_PTR:.+]] = getelementptr inbounds %[[LAMBDA_TY]], ptr %[[THIS_PTR]], i32 0, i32 0
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// CHECK: %[[I_PTR:.+]] = load ptr, ptr %[[LAMBDA_GEP_TO_PTR]]
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// CHECK: %[[I_VALUE:.+]] = load i32, ptr %[[I_PTR]]
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// Load the 'j', passed by value.
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// CHECK: %[[LAMBDA_GEP_TO_INT:.+]] = getelementptr inbounds %[[LAMBDA_TY]], ptr %[[THIS_PTR]], i32 0, i32 1
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// CHECK: %[[J_VALUE:.+]] = load i32, ptr %[[LAMBDA_GEP_TO_INT]]
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