1 // RUN: %clang_cc1 -emit-llvm -triple=wasm32-unknown-unknown -o - %s \
2 // RUN: | FileCheck %s -check-prefix=WEBASSEMBLY32
3 // RUN: %clang_cc1 -emit-llvm -triple=wasm64-unknown-unknown -o - %s \
4 // RUN: | FileCheck %s -check-prefix=WEBASSEMBLY64
5
6 // Test that we don't create common blocks.
7 int tentative;
8 // WEBASSEMBLY32: @tentative = global i32 0, align 4
9 // WEBASSEMBLY64: @tentative = global i32 0, align 4
10
11 // Test that WebAssembly uses the ARM-style ABI in which the static
12 // variable's guard variable is tested via "load i8 and test the
13 // bottom bit" rather than the Itanium/x86 ABI which uses "load i8
14 // and compare with zero".
15 int f();
g()16 void g() {
17 static int a = f();
18 }
19 // WEBASSEMBLY32-LABEL: @_Z1gv()
20 // WEBASSEMBLY32: %[[R0:.+]] = load atomic i8, i8* bitcast (i32* @_ZGVZ1gvE1a to i8*) acquire, align 4
21 // WEBASSEMBLY32-NEXT: %[[R1:.+]] = and i8 %[[R0]], 1
22 // WEBASSEMBLY32-NEXT: %[[R2:.+]] = icmp eq i8 %[[R1]], 0
23 // WEBASSEMBLY32-NEXT: br i1 %[[R2]], label %[[CHECK:.+]], label %[[END:.+]]
24 // WEBASSEMBLY32: [[CHECK]]
25 // WEBASSEMBLY32: call i32 @__cxa_guard_acquire
26 // WEBASSEMBLY32: [[END]]
27 // WEBASSEMBLY32: call void @__cxa_guard_release
28 //
29 // WEBASSEMBLY64-LABEL: @_Z1gv()
30 // WEBASSEMBLY64: %[[R0:.+]] = load atomic i8, i8* bitcast (i64* @_ZGVZ1gvE1a to i8*) acquire, align 8
31 // WEBASSEMBLY64-NEXT: %[[R1:.+]] = and i8 %[[R0]], 1
32 // WEBASSEMBLY64-NEXT: %[[R2:.+]] = icmp eq i8 %[[R1]], 0
33 // WEBASSEMBLY64-NEXT: br i1 %[[R2]], label %[[CHECK:.+]], label %[[END:.+]]
34 // WEBASSEMBLY64: [[CHECK]]
35 // WEBASSEMBLY64: call i32 @__cxa_guard_acquire
36 // WEBASSEMBLY64: [[END]]
37 // WEBASSEMBLY64: call void @__cxa_guard_release
38
39 // Test various aspects of static constructor calls.
40 struct A {
41 A();
42 };
43
44 A theA;
45
46 // WEBASSEMBLY32: define internal void @__cxx_global_var_init() #0 section ".text.__startup" {
47 // WEBASSEMBLY32: call %struct.A* @_ZN1AC1Ev(%struct.A* @theA)
48 // WEBASSEMBLY32: define internal void @_GLOBAL__sub_I_static_init_wasm.cpp() #0 section ".text.__startup" {
49 // WEBASSEMBLY32: call void @__cxx_global_var_init()
50 //
51 // WEBASSEMBLY64: define internal void @__cxx_global_var_init() #0 section ".text.__startup" {
52 // WEBASSEMBLY64: call %struct.A* @_ZN1AC1Ev(%struct.A* @theA)
53 // WEBASSEMBLY64: define internal void @_GLOBAL__sub_I_static_init_wasm.cpp() #0 section ".text.__startup" {
54 // WEBASSEMBLY64: call void @__cxx_global_var_init()
55