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[Clang][WebAssembly] Fix crash when using __funcref in C++ code (#176237)

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Enable address space map mangling for the WebAssembly target. This fixes
a crash in the Itanium name mangler when trying to mangle types with the
wasm_funcref address space qualifier in C++ mode.

Fixes #176154
This commit is contained in:
Paulo Matos 2026-01-21 17:56:55 +01:00 committed by GitHub
parent 7e01b33a42
commit e02a55ca90
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GPG Key ID: B5690EEEBB952194
2 changed files with 16 additions and 1 deletions
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1
clang/lib/Basic/Targets/WebAssembly.h
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@ -81,6 +81,7 @@ public:
explicit WebAssemblyTargetInfo(const llvm::Triple &T, const TargetOptions &)
: TargetInfo(T) {
AddrSpaceMap = &WebAssemblyAddrSpaceMap;
UseAddrSpaceMapMangling = true;
NoAsmVariants = true;
SuitableAlign = 128;
LargeArrayMinWidth = 128;

16
clang/test/CodeGenCXX/wasm-reftypes-mangle.cpp
View File

@ -2,5 +2,19 @@
// RUN: %clang_cc1 %s -triple wasm32-unknown-unknown -target-feature +reference-types -emit-llvm -o - -std=c++11 | FileCheck %s
// RUN: %clang_cc1 %s -triple wasm64-unknown-unknown -target-feature +reference-types -emit-llvm -o - -std=c++11 | FileCheck %s
// CHECK: _Z2f1u11externref_t
// Test that funcref can be used in C++ without crashing during codegen.
// See https://github.com/llvm/llvm-project/issues/176154
typedef void (*__funcref funcref_t)();
// Global funcref variables - test that codegen doesn't crash.
// CHECK-DAG: @fptr = global ptr addrspace(20) null
funcref_t fptr;
// CHECK-DAG: @fpt2 = global ptr addrspace(20) null
void (*__funcref fpt2)();
// CHECK-DAG: _Z2f1u11externref_t
void f1(__externref_t) {}
// CHECK-DAG: _Z2f2PU4AS20FvvE
void f2(funcref_t) {}