clang: add support for asmjs arch and Emscripten OS

test/CodeGen/emscripten-arguments.c

Index: test/CodeGen/emscripten-arguments.c
diff --git a/test/CodeGen/emscripten-arguments.c b/test/CodeGen/emscripten-arguments.c
new file mode 100644
index 0000000000000000000000000000000000000000..b90164bfb8b466e20654c30cc1c615416ba369d1
--- /dev/null
+++ b/test/CodeGen/emscripten-arguments.c
@@ -0,0 +1,79 @@
+// RUN: %clang_cc1 -triple asmjs-unknown-emscripten %s -emit-llvm -o - | FileCheck %s
+
+// Basic argument/attribute tests for asmjs/Emscripten
+
+// CHECK: define void @f0(i32 %i, i32 %j, i64 %k, double %l, double %m)
+void f0(int i, long j, long long k, double l, long double m) {}
+
+typedef struct {
+  int aa;
+  int bb;
+} s1;
+// Structs should be passed byval and not split up.
+// CHECK: define void @f1(%struct.s1* byval align 4 %i)
+void f1(s1 i) {}
+
+typedef struct {
+  int cc;
+} s2;
+// Single-element structs should be returned as the one element.
+// CHECK: define i32 @f2()
+s2 f2() {
+  s2 foo;
+  return foo;
+}
+
+typedef struct {
+  int cc;
+  int dd;
+} s3;
+// Structs should be returned sret and not simplified by the frontend.
+// CHECK: define void @f3(%struct.s3* noalias sret %agg.result)
+s3 f3() {
+  s3 foo;
+  return foo;
+}
+
+// CHECK: define void @f4(i64 %i)
+void f4(long long i) {}
+
+// i8/i16 should be signext, i32 and higher should not.
+// CHECK: define void @f5(i8 signext %a, i16 signext %b)
+void f5(char a, short b) {}
+
+// CHECK: define void @f6(i8 zeroext %a, i16 zeroext %b)
+void f6(unsigned char a, unsigned short b) {}
+
+
+enum my_enum {
+  ENUM1,
+  ENUM2,
+  ENUM3,
+};
+// Enums should be treated as the underlying i32.
+// CHECK: define void @f7(i32 %a)
+void f7(enum my_enum a) {}
+
+enum my_big_enum {
+  ENUM4 = 0xFFFFFFFFFFFFFFFF,
+};
+// Big enums should be treated as the underlying i64.
+// CHECK: define void @f8(i64 %a)
+void f8(enum my_big_enum a) {}
+
+union simple_union {
+  int a;
+  char b;
+};
+// Unions should be passed as byval structs.
+// CHECK: define void @f9(%union.simple_union* byval align 4 %s)
+void f9(union simple_union s) {}
+
+typedef struct {
+  int b4 : 4;
+  int b3 : 3;
+  int b8 : 8;
+} bitfield1;
+// Bitfields should be passed as byval structs.
+// CHECK: define void @f10(%struct.bitfield1* byval align 4 %bf1)
+void f10(bitfield1 bf1) {}