Add PNaClSjLjEH pass to implement C++ exception handling using setjmp()+longjmp()

test/Transforms/NaCl/pnacl-eh-exception-info.ll

+; RUN: opt %s -pnacl-sjlj-eh -S | FileCheck %s
+
+; Example std::type_info objects.
+@exc_typeid1 = external global i8
+@exc_typeid2 = external global i8
+@exc_typeid3 = external global i8
+
+; This must be declared for "-pnacl-sjlj-eh" to work.
+@__pnacl_eh_stack = external thread_local global i8*
+
+declare i32 @llvm.eh.typeid.for(i8*)
+
+declare void @external_func()
+
+
+@__pnacl_eh_type_table = external global i8*
+@__pnacl_eh_action_table = external global i8*
+@__pnacl_eh_filter_table = external global i8*
+
+; CHECK: %action_table_entry = type { i32, i32 }
+
+; CHECK: @__pnacl_eh_type_table = internal constant [4 x i8*] [i8* @exc_typeid1, i8* @exc_typeid2, i8* @exc_typeid3, i8* null]
+
+; CHECK: @__pnacl_eh_action_table = internal constant [6 x %action_table_entry] [%action_table_entry { i32 2, i32 0 }, %action_table_entry { i32 1, i32 1 }, %action_table_entry { i32 0, i32 2 }, %action_table_entry { i32 -1, i32 0 }, %action_table_entry { i32 -2, i32 0 }, %action_table_entry { i32 3, i32 0 }]
+
+; CHECK: @__pnacl_eh_filter_table = internal constant [5 x i32] [i32 -1, i32 1, i32 2, i32 0, i32 -1]
+
+
+; Exception type pointers are allocated IDs which specify the index
+; into __pnacl_eh_type_table where the type may be found.
+define void @test_eh_typeid(i32 %arg) {
+  %id1 = call i32 @llvm.eh.typeid.for(i8* @exc_typeid1)
+  %id2 = call i32 @llvm.eh.typeid.for(i8* @exc_typeid2)
+  %id3 = call i32 @llvm.eh.typeid.for(i8* @exc_typeid3)
+  %cmp1 = icmp eq i32 %arg, %id1
+  %cmp2 = icmp eq i32 %arg, %id2
+  %cmp3 = icmp eq i32 %arg, %id3
+  ret void
+}
+; CHECK: define void @test_eh_typeid
+; CHECK-NEXT: %cmp1 = icmp eq i32 %arg, 0
+; CHECK-NEXT: %cmp2 = icmp eq i32 %arg, 1
+; CHECK-NEXT: %cmp3 = icmp eq i32 %arg, 2
+; CHECK-NEXT: ret void
+
+
+define void @test_single_catch_clause() {
+  invoke void @external_func() to label %cont unwind label %lpad
+cont:
+  ret void
+lpad:
+  landingpad i32 personality i8* null
+      catch i8* @exc_typeid3
+  ret void
+}
+; CHECK: define void @test_single_catch_clause
+; CHECK: store i32 1, i32* %exc_info_ptr
+
+
+define void @test_multiple_catch_clauses() {
+  invoke void @external_func() to label %cont unwind label %lpad
+cont:
+  ret void
+lpad:
+  landingpad i32 personality i8* null
+      catch i8* @exc_typeid1
+      catch i8* @exc_typeid2
+      catch i8* @exc_typeid3
+  ret void
+}
+; CHECK: define void @test_multiple_catch_clauses
+; CHECK: store i32 3, i32* %exc_info_ptr
+
+
+define void @test_empty_filter_clause() {
+  invoke void @external_func() to label %cont unwind label %lpad
+cont:
+  ret void
+lpad:
+  landingpad i32 personality i8* null
+      filter [0 x i8*] []
+  ret void
+}
+; CHECK: define void @test_empty_filter_clause
+; CHECK: store i32 4, i32* %exc_info_ptr
+
+
+define void @test_filter_clause() {
+  invoke void @external_func() to label %cont unwind label %lpad
+cont:
+  ret void
+lpad:
+  landingpad i32 personality i8* null
+      filter [3 x i8*] [i8* @exc_typeid2,
+                        i8* @exc_typeid3,
+                        i8* @exc_typeid1]
+  ret void
+}
+; CHECK: define void @test_filter_clause
+; CHECK: store i32 5, i32* %exc_info_ptr
+
+
+; "catch i8* null" means that any C++ exception matches.
+define void @test_catch_all_clause() {
+  invoke void @external_func() to label %cont unwind label %lpad
+cont:
+  ret void
+lpad:
+  landingpad i32 personality i8* null
+      catch i8* null
+  ret void
+}
+; CHECK: define void @test_catch_all_clause
+; CHECK: store i32 6, i32* %exc_info_ptr
+
+
+; "cleanup" is treated the same as "catch i8* null".
+define void @test_cleanup_clause() {
+  invoke void @external_func() to label %cont unwind label %lpad
+cont:
+  ret void
+lpad:
+  landingpad i32 personality i8* null
+      cleanup
+  ret void
+}
+; CHECK: define void @test_cleanup_clause
+; CHECK: store i32 6, i32* %exc_info_ptr