DWARF: Fix debug_range handling of invalid entries (#2662)

If an invalid entry appears - either it began as such, or became
invalid after optimization - we should not emit (0, 0) which is
an end marker. Instead, emit an invalid entry marker, something
with (0, x) for x != 0.

As a bonus, if a test/passes case has "noprint" in the name,
don't print the wasm, which we do by default. In the testcase
here for example we just care about the dwarf, and the
printed module would be quite large.

Thank you to @paolosevMSFT for identifying and suggesting
the fix.

3 files changed, 709 insertions, 0 deletions

diff --git a/test/passes/class_with_dwarf_noprint.bin.txt b/test/passes/class_with_dwarf_noprint.bin.txt
new file mode 100644
index 000000000..bf62b2ce3
--- /dev/null
+++ b/test/passes/class_with_dwarf_noprint.bin.txt
@@ -0,0 +1,708 @@
+DWARF debug info
+================
+
+Contains section .debug_info (429 bytes)
+Contains section .debug_loc (199 bytes)
+Contains section .debug_ranges (24 bytes)
+Contains section .debug_abbrev (337 bytes)
+Contains section .debug_line (438 bytes)
+Contains section .debug_str (364 bytes)
+
+.debug_abbrev contents:
+Abbrev table for offset: 0x00000000
+[1] DW_TAG_compile_unit	DW_CHILDREN_yes
+	DW_AT_producer	DW_FORM_strp
+	DW_AT_language	DW_FORM_data2
+	DW_AT_name	DW_FORM_strp
+	DW_AT_stmt_list	DW_FORM_sec_offset
+	DW_AT_comp_dir	DW_FORM_strp
+	DW_AT_low_pc	DW_FORM_addr
+	DW_AT_high_pc	DW_FORM_data4
+
+[2] DW_TAG_variable	DW_CHILDREN_no
+	DW_AT_name	DW_FORM_strp
+	DW_AT_type	DW_FORM_ref4
+	DW_AT_external	DW_FORM_flag_present
+	DW_AT_decl_file	DW_FORM_data1
+	DW_AT_decl_line	DW_FORM_data1
+	DW_AT_location	DW_FORM_exprloc
+
+[3] DW_TAG_structure_type	DW_CHILDREN_yes
+	DW_AT_calling_convention	DW_FORM_data1
+	DW_AT_name	DW_FORM_strp
+	DW_AT_byte_size	DW_FORM_data1
+	DW_AT_decl_file	DW_FORM_data1
+	DW_AT_decl_line	DW_FORM_data1
+
+[4] DW_TAG_member	DW_CHILDREN_no
+	DW_AT_name	DW_FORM_strp
+	DW_AT_type	DW_FORM_ref4
+	DW_AT_decl_file	DW_FORM_data1
+	DW_AT_decl_line	DW_FORM_data1
+	DW_AT_data_member_location	DW_FORM_data1
+	DW_AT_accessibility	DW_FORM_data1
+
+[5] DW_TAG_subprogram	DW_CHILDREN_yes
+	DW_AT_name	DW_FORM_strp
+	DW_AT_decl_file	DW_FORM_data1
+	DW_AT_decl_line	DW_FORM_data1
+	DW_AT_declaration	DW_FORM_flag_present
+	DW_AT_external	DW_FORM_flag_present
+
+[6] DW_TAG_formal_parameter	DW_CHILDREN_no
+	DW_AT_type	DW_FORM_ref4
+	DW_AT_artificial	DW_FORM_flag_present
+
+[7] DW_TAG_subprogram	DW_CHILDREN_yes
+	DW_AT_linkage_name	DW_FORM_strp
+	DW_AT_name	DW_FORM_strp
+	DW_AT_decl_file	DW_FORM_data1
+	DW_AT_decl_line	DW_FORM_data1
+	DW_AT_type	DW_FORM_ref4
+	DW_AT_declaration	DW_FORM_flag_present
+	DW_AT_external	DW_FORM_flag_present
+
+[8] DW_TAG_formal_parameter	DW_CHILDREN_no
+	DW_AT_type	DW_FORM_ref4
+
+[9] DW_TAG_enumeration_type	DW_CHILDREN_yes
+	DW_AT_type	DW_FORM_ref4
+	DW_AT_byte_size	DW_FORM_data1
+	DW_AT_decl_file	DW_FORM_data1
+	DW_AT_decl_line	DW_FORM_data1
+
+[10] DW_TAG_enumerator	DW_CHILDREN_no
+	DW_AT_name	DW_FORM_strp
+	DW_AT_const_value	DW_FORM_udata
+
+[11] DW_TAG_base_type	DW_CHILDREN_no
+	DW_AT_name	DW_FORM_strp
+	DW_AT_encoding	DW_FORM_data1
+	DW_AT_byte_size	DW_FORM_data1
+
+[12] DW_TAG_pointer_type	DW_CHILDREN_no
+	DW_AT_type	DW_FORM_ref4
+
+[13] DW_TAG_namespace	DW_CHILDREN_yes
+	DW_AT_name	DW_FORM_strp
+
+[14] DW_TAG_typedef	DW_CHILDREN_no
+	DW_AT_type	DW_FORM_ref4
+	DW_AT_name	DW_FORM_strp
+	DW_AT_decl_file	DW_FORM_data1
+	DW_AT_decl_line	DW_FORM_data1
+
+[15] DW_TAG_unspecified_type	DW_CHILDREN_no
+	DW_AT_name	DW_FORM_strp
+
+[16] DW_TAG_imported_declaration	DW_CHILDREN_no
+	DW_AT_decl_file	DW_FORM_data1
+	DW_AT_decl_line	DW_FORM_data1
+	DW_AT_import	DW_FORM_ref4
+
+[17] DW_TAG_subprogram	DW_CHILDREN_yes
+	DW_AT_specification	DW_FORM_ref4
+	DW_AT_inline	DW_FORM_data1
+	DW_AT_object_pointer	DW_FORM_ref4
+
+[18] DW_TAG_formal_parameter	DW_CHILDREN_no
+	DW_AT_name	DW_FORM_strp
+	DW_AT_type	DW_FORM_ref4
+	DW_AT_artificial	DW_FORM_flag_present
+
+[19] DW_TAG_formal_parameter	DW_CHILDREN_no
+	DW_AT_name	DW_FORM_strp
+	DW_AT_decl_file	DW_FORM_data1
+	DW_AT_decl_line	DW_FORM_data1
+	DW_AT_type	DW_FORM_ref4
+
+[20] DW_TAG_subprogram	DW_CHILDREN_yes
+	DW_AT_low_pc	DW_FORM_addr
+	DW_AT_high_pc	DW_FORM_data4
+	DW_AT_frame_base	DW_FORM_exprloc
+	DW_AT_GNU_all_call_sites	DW_FORM_flag_present
+	DW_AT_name	DW_FORM_strp
+	DW_AT_decl_file	DW_FORM_data1
+	DW_AT_decl_line	DW_FORM_data1
+	DW_AT_type	DW_FORM_ref4
+	DW_AT_external	DW_FORM_flag_present
+
+[21] DW_TAG_variable	DW_CHILDREN_no
+	DW_AT_location	DW_FORM_sec_offset
+	DW_AT_name	DW_FORM_strp
+	DW_AT_decl_file	DW_FORM_data1
+	DW_AT_decl_line	DW_FORM_data1
+	DW_AT_type	DW_FORM_ref4
+
+[22] DW_TAG_lexical_block	DW_CHILDREN_yes
+	DW_AT_low_pc	DW_FORM_addr
+	DW_AT_high_pc	DW_FORM_data4
+
+[23] DW_TAG_inlined_subroutine	DW_CHILDREN_yes
+	DW_AT_abstract_origin	DW_FORM_ref4
+	DW_AT_ranges	DW_FORM_sec_offset
+	DW_AT_call_file	DW_FORM_data1
+	DW_AT_call_line	DW_FORM_data1
+	DW_AT_call_column	DW_FORM_data1
+
+[24] DW_TAG_formal_parameter	DW_CHILDREN_no
+	DW_AT_abstract_origin	DW_FORM_ref4
+
+[25] DW_TAG_formal_parameter	DW_CHILDREN_no
+	DW_AT_location	DW_FORM_sec_offset
+	DW_AT_abstract_origin	DW_FORM_ref4
+
+[26] DW_TAG_inlined_subroutine	DW_CHILDREN_yes
+	DW_AT_abstract_origin	DW_FORM_ref4
+	DW_AT_low_pc	DW_FORM_addr
+	DW_AT_high_pc	DW_FORM_data4
+	DW_AT_call_file	DW_FORM_data1
+	DW_AT_call_line	DW_FORM_data1
+	DW_AT_call_column	DW_FORM_data1
+
+[27] DW_TAG_GNU_call_site	DW_CHILDREN_no
+	DW_AT_low_pc	DW_FORM_addr
+
+
+.debug_info contents:
+0x00000000: Compile Unit: length = 0x000001a9 version = 0x0004 abbr_offset = 0x0000 addr_size = 0x04 (next unit at 0x000001ad)
+
+0x0000000b: DW_TAG_compile_unit [1] *
+              DW_AT_producer [DW_FORM_strp]	( .debug_str[0x00000000] = "clang version 11.0.0 (/b/s/w/ir/cache/git/chromium.googlesource.com-external-github.com-llvm-llvm--project d6fe253653b7e760f94ca21d0a7ebbfeeee28777)")
+              DW_AT_language [DW_FORM_data2]	(DW_LANG_C_plus_plus)
+              DW_AT_name [DW_FORM_strp]	( .debug_str[0x00000095] = "/tmp/emscripten_test_wasm3_2u9tontv/src.cpp")
+              DW_AT_stmt_list [DW_FORM_sec_offset]	(0x00000000)
+              DW_AT_comp_dir [DW_FORM_strp]	( .debug_str[0x000000c1] = "/tmp/emscripten_test_wasm3_2u9tontv")
+              DW_AT_low_pc [DW_FORM_addr]	(0x0000000000000006)
+              DW_AT_high_pc [DW_FORM_data4]	(0x000000a6)
+
+0x00000026:   DW_TAG_variable [2]  
+                DW_AT_name [DW_FORM_strp]	( .debug_str[0x000000e5] = "rng1")
+                DW_AT_type [DW_FORM_ref4]	(cu + 0x0037 => {0x00000037} "Random")
+                DW_AT_external [DW_FORM_flag_present]	(true)
+                DW_AT_decl_file [DW_FORM_data1]	("/tmp/emscripten_test_wasm3_2u9tontv/src.cpp")
+                DW_AT_decl_line [DW_FORM_data1]	(23)
+                DW_AT_location [DW_FORM_exprloc]	(DW_OP_addr 0x638)
+
+0x00000037:   DW_TAG_structure_type [3] *
+                DW_AT_calling_convention [DW_FORM_data1]	(DW_CC_pass_by_value)
+                DW_AT_name [DW_FORM_strp]	( .debug_str[0x000000fc] = "Random")
+                DW_AT_byte_size [DW_FORM_data1]	(0x04)
+                DW_AT_decl_file [DW_FORM_data1]	("/tmp/emscripten_test_wasm3_2u9tontv/src.cpp")
+                DW_AT_decl_line [DW_FORM_data1]	(9)
+
+0x00000040:     DW_TAG_member [4]  
+                  DW_AT_name [DW_FORM_strp]	( .debug_str[0x000000ea] = "last")
+                  DW_AT_type [DW_FORM_ref4]	(cu + 0x0095 => {0x00000095} "unsigned int")
+                  DW_AT_decl_file [DW_FORM_data1]	("/tmp/emscripten_test_wasm3_2u9tontv/src.cpp")
+                  DW_AT_decl_line [DW_FORM_data1]	(22)
+                  DW_AT_data_member_location [DW_FORM_data1]	(0x00)
+                  DW_AT_accessibility [DW_FORM_data1]	(DW_ACCESS_protected)
+
+0x0000004d:     DW_TAG_subprogram [5] *
+                  DW_AT_name [DW_FORM_strp]	( .debug_str[0x000000fc] = "Random")
+                  DW_AT_decl_file [DW_FORM_data1]	("/tmp/emscripten_test_wasm3_2u9tontv/src.cpp")
+                  DW_AT_decl_line [DW_FORM_data1]	(15)
+                  DW_AT_declaration [DW_FORM_flag_present]	(true)
+                  DW_AT_external [DW_FORM_flag_present]	(true)
+
+0x00000054:       DW_TAG_formal_parameter [6]  
+                    DW_AT_type [DW_FORM_ref4]	(cu + 0x009c => {0x0000009c} "Random*")
+                    DW_AT_artificial [DW_FORM_flag_present]	(true)
+
+0x00000059:       NULL
+
+0x0000005a:     DW_TAG_subprogram [7] *
+                  DW_AT_linkage_name [DW_FORM_strp]	( .debug_str[0x00000103] = "_ZN6Random3getEf")
+                  DW_AT_name [DW_FORM_strp]	( .debug_str[0x00000114] = "get")
+                  DW_AT_decl_file [DW_FORM_data1]	("/tmp/emscripten_test_wasm3_2u9tontv/src.cpp")
+                  DW_AT_decl_line [DW_FORM_data1]	(16)
+                  DW_AT_type [DW_FORM_ref4]	(cu + 0x00a1 => {0x000000a1} "float")
+                  DW_AT_declaration [DW_FORM_flag_present]	(true)
+                  DW_AT_external [DW_FORM_flag_present]	(true)
+
+0x00000069:       DW_TAG_formal_parameter [6]  
+                    DW_AT_type [DW_FORM_ref4]	(cu + 0x009c => {0x0000009c} "Random*")
+                    DW_AT_artificial [DW_FORM_flag_present]	(true)
+
+0x0000006e:       DW_TAG_formal_parameter [8]  
+                    DW_AT_type [DW_FORM_ref4]	(cu + 0x00a1 => {0x000000a1} "float")
+
+0x00000073:       NULL
+
+0x00000074:     DW_TAG_enumeration_type [9] *
+                  DW_AT_type [DW_FORM_ref4]	(cu + 0x0095 => {0x00000095} "unsigned int")
+                  DW_AT_byte_size [DW_FORM_data1]	(0x04)
+                  DW_AT_decl_file [DW_FORM_data1]	("/tmp/emscripten_test_wasm3_2u9tontv/src.cpp")
+                  DW_AT_decl_line [DW_FORM_data1]	(10)
+
+0x0000007c:       DW_TAG_enumerator [10]  
+                    DW_AT_name [DW_FORM_strp]	( .debug_str[0x0000011e] = "IM")
+                    DW_AT_const_value [DW_FORM_udata]	(139968)
+
+0x00000084:       DW_TAG_enumerator [10]  
+                    DW_AT_name [DW_FORM_strp]	( .debug_str[0x00000121] = "IA")
+                    DW_AT_const_value [DW_FORM_udata]	(3877)
+
+0x0000008b:       DW_TAG_enumerator [10]  
+                    DW_AT_name [DW_FORM_strp]	( .debug_str[0x00000124] = "IC")
+                    DW_AT_const_value [DW_FORM_udata]	(29573)
+
+0x00000093:       NULL
+
+0x00000094:     NULL
+
+0x00000095:   DW_TAG_base_type [11]  
+                DW_AT_name [DW_FORM_strp]	( .debug_str[0x000000ef] = "unsigned int")
+                DW_AT_encoding [DW_FORM_data1]	(DW_ATE_unsigned)
+                DW_AT_byte_size [DW_FORM_data1]	(0x04)
+
+0x0000009c:   DW_TAG_pointer_type [12]  
+                DW_AT_type [DW_FORM_ref4]	(cu + 0x0037 => {0x00000037} "Random")
+
+0x000000a1:   DW_TAG_base_type [11]  
+                DW_AT_name [DW_FORM_strp]	( .debug_str[0x00000118] = "float")
+                DW_AT_encoding [DW_FORM_data1]	(DW_ATE_float)
+                DW_AT_byte_size [DW_FORM_data1]	(0x04)
+
+0x000000a8:   DW_TAG_namespace [13] *
+                DW_AT_name [DW_FORM_strp]	( .debug_str[0x00000127] = "std")
+
+0x000000ad:     DW_TAG_typedef [14]  
+                  DW_AT_type [DW_FORM_ref4]	(cu + 0x00b9 => {0x000000b9} "decltype(nullptr)")
+                  DW_AT_name [DW_FORM_strp]	( .debug_str[0x0000013d] = "nullptr_t")
+                  DW_AT_decl_file [DW_FORM_data1]	("/usr/local/google/home/azakai/Dev/emscripten/system/include/libcxx/__nullptr")
+                  DW_AT_decl_line [DW_FORM_data1]	(57)
+
+0x000000b8:     NULL
+
+0x000000b9:   DW_TAG_unspecified_type [15]  
+                DW_AT_name [DW_FORM_strp]	( .debug_str[0x0000012b] = "decltype(nullptr)")
+
+0x000000be:   DW_TAG_imported_declaration [16]  
+                DW_AT_decl_file [DW_FORM_data1]	("/usr/local/google/home/azakai/Dev/emscripten/system/include/libcxx/stddef.h")
+                DW_AT_decl_line [DW_FORM_data1]	(52)
+                DW_AT_import [DW_FORM_ref4]	(cu + 0x00ad => {0x000000ad})
+
+0x000000c5:   DW_TAG_subprogram [17] *
+                DW_AT_specification [DW_FORM_ref4]	(cu + 0x005a => {0x0000005a} "_ZN6Random3getEf")
+                DW_AT_inline [DW_FORM_data1]	(DW_INL_inlined)
+                DW_AT_object_pointer [DW_FORM_ref4]	(cu + 0x00cf => {0x000000cf})
+
+0x000000cf:     DW_TAG_formal_parameter [18]  
+                  DW_AT_name [DW_FORM_strp]	( .debug_str[0x00000147] = "this")
+                  DW_AT_type [DW_FORM_ref4]	(cu + 0x00e4 => {0x000000e4} "Random*")
+                  DW_AT_artificial [DW_FORM_flag_present]	(true)
+
+0x000000d8:     DW_TAG_formal_parameter [19]  
+                  DW_AT_name [DW_FORM_strp]	( .debug_str[0x0000014c] = "max")
+                  DW_AT_decl_file [DW_FORM_data1]	("/tmp/emscripten_test_wasm3_2u9tontv/src.cpp")
+                  DW_AT_decl_line [DW_FORM_data1]	(16)
+                  DW_AT_type [DW_FORM_ref4]	(cu + 0x00a1 => {0x000000a1} "float")
+
+0x000000e3:     NULL
+
+0x000000e4:   DW_TAG_pointer_type [12]  
+                DW_AT_type [DW_FORM_ref4]	(cu + 0x0037 => {0x00000037} "Random")
+
+0x000000e9:   DW_TAG_subprogram [20] *
+                DW_AT_low_pc [DW_FORM_addr]	(0x0000000000000006)
+                DW_AT_high_pc [DW_FORM_data4]	(0x000000a6)
+                DW_AT_frame_base [DW_FORM_exprloc]	(DW_OP_WASM_location 0x0 +0, DW_OP_stack_value)
+                DW_AT_GNU_all_call_sites [DW_FORM_flag_present]	(true)
+                DW_AT_name [DW_FORM_strp]	( .debug_str[0x00000150] = "main")
+                DW_AT_decl_file [DW_FORM_data1]	("/tmp/emscripten_test_wasm3_2u9tontv/src.cpp")
+                DW_AT_decl_line [DW_FORM_data1]	(24)
+                DW_AT_type [DW_FORM_ref4]	(cu + 0x01a5 => {0x000001a5} "int")
+                DW_AT_external [DW_FORM_flag_present]	(true)
+
+0x00000101:     DW_TAG_variable [21]  
+                  DW_AT_location [DW_FORM_sec_offset]	(0x00000000: 
+                     [0x00000018,  0x00000020): DW_OP_constu 0x2a, DW_OP_stack_value
+                     [0x00000007,  0x00000007): DW_OP_WASM_location 0x0 +1, DW_OP_stack_value)
+                  DW_AT_name [DW_FORM_strp]	( .debug_str[0x00000159] = "rng2")
+                  DW_AT_decl_file [DW_FORM_data1]	("/tmp/emscripten_test_wasm3_2u9tontv/src.cpp")
+                  DW_AT_decl_line [DW_FORM_data1]	(25)
+                  DW_AT_type [DW_FORM_ref4]	(cu + 0x0037 => {0x00000037} "Random")
+
+0x00000110:     DW_TAG_variable [21]  
+                  DW_AT_location [DW_FORM_sec_offset]	(0x00000023: 
+                     [0x00000018,  0x00000020): DW_OP_consts +0, DW_OP_stack_value
+                     [0x00000085,  0x00000092): DW_OP_WASM_location 0x0 +2, DW_OP_stack_value)
+                  DW_AT_name [DW_FORM_strp]	( .debug_str[0x0000015e] = "count")
+                  DW_AT_decl_file [DW_FORM_data1]	("/tmp/emscripten_test_wasm3_2u9tontv/src.cpp")
+                  DW_AT_decl_line [DW_FORM_data1]	(26)
+                  DW_AT_type [DW_FORM_ref4]	(cu + 0x01a5 => {0x000001a5} "int")
+
+0x0000011f:     DW_TAG_lexical_block [22] *
+                  DW_AT_low_pc [DW_FORM_addr]	(0x0000000000000026)
+                  DW_AT_high_pc [DW_FORM_data4]	(0xffffffda)
+
+0x00000128:       DW_TAG_variable [21]  
+                    DW_AT_location [DW_FORM_sec_offset]	(0x00000046: 
+                       [0x00000018,  0x00000020): DW_OP_consts +0, DW_OP_stack_value
+                       [0x00000007,  0x00000007): DW_OP_WASM_location 0x0 +3, DW_OP_stack_value)
+                    DW_AT_name [DW_FORM_strp]	( .debug_str[0x00000164] = "i")
+                    DW_AT_decl_file [DW_FORM_data1]	("/tmp/emscripten_test_wasm3_2u9tontv/src.cpp")
+                    DW_AT_decl_line [DW_FORM_data1]	(27)
+                    DW_AT_type [DW_FORM_ref4]	(cu + 0x01a5 => {0x000001a5} "int")
+
+0x00000137:       DW_TAG_lexical_block [22] *
+                    DW_AT_low_pc [DW_FORM_addr]	(0x0000000000000026)
+                    DW_AT_high_pc [DW_FORM_data4]	(0x0000005f)
+
+0x00000140:         DW_TAG_variable [21]  
+                      DW_AT_location [DW_FORM_sec_offset]	(0x0000009b: 
+                         [0x00000007,  0x00000007): DW_OP_WASM_location 0x0 +5, DW_OP_stack_value)
+                      DW_AT_name [DW_FORM_strp]	( .debug_str[0x00000166] = "x2")
+                      DW_AT_decl_file [DW_FORM_data1]	("/tmp/emscripten_test_wasm3_2u9tontv/src.cpp")
+                      DW_AT_decl_line [DW_FORM_data1]	(29)
+                      DW_AT_type [DW_FORM_ref4]	(cu + 0x00a1 => {0x000000a1} "float")
+
+0x0000014f:         DW_TAG_variable [21]  
+                      DW_AT_location [DW_FORM_sec_offset]	(0x000000b1: 
+                         [0x00000007,  0x00000007): DW_OP_WASM_location 0x0 +6, DW_OP_stack_value)
+                      DW_AT_name [DW_FORM_strp]	( .debug_str[0x00000169] = "x1")
+                      DW_AT_decl_file [DW_FORM_data1]	("/tmp/emscripten_test_wasm3_2u9tontv/src.cpp")
+                      DW_AT_decl_line [DW_FORM_data1]	(28)
+                      DW_AT_type [DW_FORM_ref4]	(cu + 0x00a1 => {0x000000a1} "float")
+
+0x0000015e:         DW_TAG_inlined_subroutine [23] *
+                      DW_AT_abstract_origin [DW_FORM_ref4]	(cu + 0x00c5 => {0x000000c5} "_ZN6Random3getEf")
+                      DW_AT_ranges [DW_FORM_sec_offset]	(0x00000000
+                         [0x00000006, 0x00000007)
+                         [0x00000061, 0x0000006a))
+                      DW_AT_call_file [DW_FORM_data1]	("/tmp/emscripten_test_wasm3_2u9tontv/src.cpp")
+                      DW_AT_call_line [DW_FORM_data1]	(28)
+                      DW_AT_call_column [DW_FORM_data1]	(0x15)
+
+0x0000016a:           DW_TAG_formal_parameter [24]  
+                        DW_AT_abstract_origin [DW_FORM_ref4]	(cu + 0x00cf => {0x000000cf} "this")
+
+0x0000016f:           DW_TAG_formal_parameter [25]  
+                        DW_AT_location [DW_FORM_sec_offset]	(0x00000069: 
+                           [0x00000022,  0x00000092): DW_OP_constu 0x3f800000, DW_OP_stack_value)
+                        DW_AT_abstract_origin [DW_FORM_ref4]	(cu + 0x00d8 => {0x000000d8} "max")
+
+0x00000178:           NULL
+
+0x00000179:         DW_TAG_inlined_subroutine [26] *
+                      DW_AT_abstract_origin [DW_FORM_ref4]	(cu + 0x00c5 => {0x000000c5} "_ZN6Random3getEf")
+                      DW_AT_low_pc [DW_FORM_addr]	(0x0000000000000040)
+                      DW_AT_high_pc [DW_FORM_data4]	(0x00000019)
+                      DW_AT_call_file [DW_FORM_data1]	("/tmp/emscripten_test_wasm3_2u9tontv/src.cpp")
+                      DW_AT_call_line [DW_FORM_data1]	(29)
+                      DW_AT_call_column [DW_FORM_data1]	(0x15)
+
+0x00000189:           DW_TAG_formal_parameter [24]  
+                        DW_AT_abstract_origin [DW_FORM_ref4]	(cu + 0x00cf => {0x000000cf} "this")
+
+0x0000018e:           DW_TAG_formal_parameter [25]  
+                        DW_AT_location [DW_FORM_sec_offset]	(0x00000082: 
+                           [0x00000007,  0x00000007): DW_OP_constu 0x3f800000, DW_OP_stack_value)
+                        DW_AT_abstract_origin [DW_FORM_ref4]	(cu + 0x00d8 => {0x000000d8} "max")
+
+0x00000197:           NULL
+
+0x00000198:         NULL
+
+0x00000199:       NULL
+
+0x0000019a:     DW_TAG_GNU_call_site [27]  
+                  DW_AT_low_pc [DW_FORM_addr]	(0x000000000000007a)
+
+0x0000019f:     DW_TAG_GNU_call_site [27]  
+                  DW_AT_low_pc [DW_FORM_addr]	(0x00000000000000a1)
+
+0x000001a4:     NULL
+
+0x000001a5:   DW_TAG_base_type [11]  
+                DW_AT_name [DW_FORM_strp]	( .debug_str[0x00000155] = "int")
+                DW_AT_encoding [DW_FORM_data1]	(DW_ATE_signed)
+                DW_AT_byte_size [DW_FORM_data1]	(0x04)
+
+0x000001ac:   NULL
+
+.debug_loc contents:
+0x00000000: 
+            [0x00000012,  0x0000001a): DW_OP_constu 0x2a, DW_OP_stack_value
+            [0x00000001,  0x00000001): DW_OP_WASM_location 0x0 +1, DW_OP_stack_value
+
+0x00000023: 
+            [0x00000012,  0x0000001a): DW_OP_consts +0, DW_OP_stack_value
+            [0x0000007f,  0x0000008c): DW_OP_WASM_location 0x0 +2, DW_OP_stack_value
+
+0x00000046: 
+            [0x00000012,  0x0000001a): DW_OP_consts +0, DW_OP_stack_value
+            [0x00000001,  0x00000001): DW_OP_WASM_location 0x0 +3, DW_OP_stack_value
+
+0x00000069: 
+            [0x0000001c,  0x0000008c): DW_OP_constu 0x3f800000, DW_OP_stack_value
+
+0x00000082: 
+            [0x00000001,  0x00000001): DW_OP_constu 0x3f800000, DW_OP_stack_value
+
+0x0000009b: 
+            [0x00000001,  0x00000001): DW_OP_WASM_location 0x0 +5, DW_OP_stack_value
+
+0x000000b1: 
+            [0x00000001,  0x00000001): DW_OP_WASM_location 0x0 +6, DW_OP_stack_value
+
+.debug_line contents:
+debug_line[0x00000000]
+Line table prologue:
+    total_length: 0x000001b2
+         version: 4
+ prologue_length: 0x0000007b
+ min_inst_length: 1
+max_ops_per_inst: 1
+ default_is_stmt: 1
+       line_base: -5
+      line_range: 14
+     opcode_base: 13
+standard_opcode_lengths[DW_LNS_copy] = 0
+standard_opcode_lengths[DW_LNS_advance_pc] = 1
+standard_opcode_lengths[DW_LNS_advance_line] = 1
+standard_opcode_lengths[DW_LNS_set_file] = 1
+standard_opcode_lengths[DW_LNS_set_column] = 1
+standard_opcode_lengths[DW_LNS_negate_stmt] = 0
+standard_opcode_lengths[DW_LNS_set_basic_block] = 0
+standard_opcode_lengths[DW_LNS_const_add_pc] = 0
+standard_opcode_lengths[DW_LNS_fixed_advance_pc] = 1
+standard_opcode_lengths[DW_LNS_set_prologue_end] = 0
+standard_opcode_lengths[DW_LNS_set_epilogue_begin] = 0
+standard_opcode_lengths[DW_LNS_set_isa] = 1
+include_directories[  1] = "/usr/local/google/home/azakai/Dev/emscripten/system/include/libcxx"
+file_names[  1]:
+           name: "src.cpp"
+      dir_index: 0
+       mod_time: 0x00000000
+         length: 0x00000000
+file_names[  2]:
+           name: "__nullptr"
+      dir_index: 1
+       mod_time: 0x00000000
+         length: 0x00000000
+file_names[  3]:
+           name: "stddef.h"
+      dir_index: 1
+       mod_time: 0x00000000
+         length: 0x00000000
+0x00000085: 00 DW_LNE_set_address (0x0000000000000006)
+0x0000008c: 03 DW_LNS_advance_line (24)
+0x0000008e: 01 DW_LNS_copy
+            0x0000000000000006     24      0      1   0             0  is_stmt
+
+
+0x0000008f: 00 DW_LNE_set_address (0x0000000000000026)
+0x00000096: 03 DW_LNS_advance_line (17)
+0x00000098: 05 DW_LNS_set_column (13)
+0x0000009a: 0a DW_LNS_set_prologue_end
+0x0000009b: 01 DW_LNS_copy
+            0x0000000000000026     17     13      1   0             0  is_stmt prologue_end
+
+
+0x0000009c: 00 DW_LNE_set_address (0x000000000000002d)
+0x000000a3: 05 DW_LNS_set_column (18)
+0x000000a5: 06 DW_LNS_negate_stmt
+0x000000a6: 01 DW_LNS_copy
+            0x000000000000002d     17     18      1   0             0 
+
+
+0x000000a7: 00 DW_LNE_set_address (0x0000000000000032)
+0x000000ae: 05 DW_LNS_set_column (23)
+0x000000b0: 01 DW_LNS_copy
+            0x0000000000000032     17     23      1   0             0 
+
+
+0x000000b1: 00 DW_LNE_set_address (0x0000000000000037)
+0x000000b8: 05 DW_LNS_set_column (29)
+0x000000ba: 01 DW_LNS_copy
+            0x0000000000000037     17     29      1   0             0 
+
+
+0x000000bb: 00 DW_LNE_set_address (0x0000000000000038)
+0x000000c2: 05 DW_LNS_set_column (10)
+0x000000c4: 01 DW_LNS_copy
+            0x0000000000000038     17     10      1   0             0 
+
+
+0x000000c5: 00 DW_LNE_set_address (0x000000000000003e)
+0x000000cc: 03 DW_LNS_advance_line (30)
+0x000000ce: 05 DW_LNS_set_column (5)
+0x000000d0: 06 DW_LNS_negate_stmt
+0x000000d1: 01 DW_LNS_copy
+            0x000000000000003e     30      5      1   0             0  is_stmt
+
+
+0x000000d2: 00 DW_LNE_set_address (0x0000000000000040)
+0x000000d9: 03 DW_LNS_advance_line (17)
+0x000000db: 05 DW_LNS_set_column (18)
+0x000000dd: 01 DW_LNS_copy
+            0x0000000000000040     17     18      1   0             0  is_stmt
+
+
+0x000000de: 00 DW_LNE_set_address (0x000000000000004a)
+0x000000e5: 05 DW_LNS_set_column (23)
+0x000000e7: 06 DW_LNS_negate_stmt
+0x000000e8: 01 DW_LNS_copy
+            0x000000000000004a     17     23      1   0             0 
+
+
+0x000000e9: 00 DW_LNE_set_address (0x000000000000004f)
+0x000000f0: 05 DW_LNS_set_column (29)
+0x000000f2: 01 DW_LNS_copy
+            0x000000000000004f     17     29      1   0             0 
+
+
+0x000000f3: 00 DW_LNE_set_address (0x0000000000000050)
+0x000000fa: 03 DW_LNS_advance_line (18)
+0x000000fc: 05 DW_LNS_set_column (18)
+0x000000fe: 06 DW_LNS_negate_stmt
+0x000000ff: 01 DW_LNS_copy
+            0x0000000000000050     18     18      1   0             0  is_stmt
+
+
+0x00000100: 00 DW_LNE_set_address (0x0000000000000058)
+0x00000107: 05 DW_LNS_set_column (23)
+0x00000109: 06 DW_LNS_negate_stmt
+0x0000010a: 01 DW_LNS_copy
+            0x0000000000000058     18     23      1   0             0 
+
+
+0x0000010b: 00 DW_LNE_set_address (0x0000000000000059)
+0x00000112: 03 DW_LNS_advance_line (30)
+0x00000114: 05 DW_LNS_set_column (28)
+0x00000116: 06 DW_LNS_negate_stmt
+0x00000117: 01 DW_LNS_copy
+            0x0000000000000059     30     28      1   0             0  is_stmt
+
+
+0x00000118: 00 DW_LNE_set_address (0x000000000000005c)
+0x0000011f: 05 DW_LNS_set_column (5)
+0x00000121: 06 DW_LNS_negate_stmt
+0x00000122: 01 DW_LNS_copy
+            0x000000000000005c     30      5      1   0             0 
+
+
+0x00000123: 00 DW_LNE_set_address (0x0000000000000061)
+0x0000012a: 03 DW_LNS_advance_line (18)
+0x0000012c: 05 DW_LNS_set_column (18)
+0x0000012e: 06 DW_LNS_negate_stmt
+0x0000012f: 01 DW_LNS_copy
+            0x0000000000000061     18     18      1   0             0  is_stmt
+
+
+0x00000130: 00 DW_LNE_set_address (0x0000000000000069)
+0x00000137: 05 DW_LNS_set_column (23)
+0x00000139: 06 DW_LNS_negate_stmt
+0x0000013a: 01 DW_LNS_copy
+            0x0000000000000069     18     23      1   0             0 
+
+
+0x0000013b: 00 DW_LNE_set_address (0x000000000000006a)
+0x00000142: 03 DW_LNS_advance_line (30)
+0x00000144: 05 DW_LNS_set_column (24)
+0x00000146: 06 DW_LNS_negate_stmt
+0x00000147: 01 DW_LNS_copy
+            0x000000000000006a     30     24      1   0             0  is_stmt
+
+
+0x00000148: 00 DW_LNE_set_address (0x000000000000006d)
+0x0000014f: 05 DW_LNS_set_column (5)
+0x00000151: 06 DW_LNS_negate_stmt
+0x00000152: 01 DW_LNS_copy
+            0x000000000000006d     30      5      1   0             0 
+
+
+0x00000153: 00 DW_LNE_set_address (0x000000000000007b)
+0x0000015a: 03 DW_LNS_advance_line (31)
+0x0000015c: 05 DW_LNS_set_column (9)
+0x0000015e: 06 DW_LNS_negate_stmt
+0x0000015f: 01 DW_LNS_copy
+            0x000000000000007b     31      9      1   0             0  is_stmt
+
+
+0x00000160: 00 DW_LNE_set_address (0x000000000000007d)
+0x00000167: 05 DW_LNS_set_column (12)
+0x00000169: 06 DW_LNS_negate_stmt
+0x0000016a: 01 DW_LNS_copy
+            0x000000000000007d     31     12      1   0             0 
+
+
+0x0000016b: 00 DW_LNE_set_address (0x0000000000000082)
+0x00000172: 05 DW_LNS_set_column (9)
+0x00000174: 01 DW_LNS_copy
+            0x0000000000000082     31      9      1   0             0 
+
+
+0x00000175: 00 DW_LNE_set_address (0x0000000000000085)
+0x0000017c: 03 DW_LNS_advance_line (27)
+0x0000017e: 05 DW_LNS_set_column (29)
+0x00000180: 06 DW_LNS_negate_stmt
+0x00000181: 01 DW_LNS_copy
+            0x0000000000000085     27     29      1   0             0  is_stmt
+
+
+0x00000182: 00 DW_LNE_set_address (0x000000000000008f)
+0x00000189: 05 DW_LNS_set_column (21)
+0x0000018b: 06 DW_LNS_negate_stmt
+0x0000018c: 01 DW_LNS_copy
+            0x000000000000008f     27     21      1   0             0 
+
+
+0x0000018d: 00 DW_LNE_set_address (0x0000000000000090)
+0x00000194: 05 DW_LNS_set_column (3)
+0x00000196: 01 DW_LNS_copy
+            0x0000000000000090     27      3      1   0             0 
+
+
+0x00000197: 00 DW_LNE_set_address (0x0000000000000093)
+0x0000019e: 03 DW_LNS_advance_line (33)
+0x000001a0: 06 DW_LNS_negate_stmt
+0x000001a1: 01 DW_LNS_copy
+            0x0000000000000093     33      3      1   0             0  is_stmt
+
+
+0x000001a2: 00 DW_LNE_set_address (0x00000000000000a2)
+0x000001a9: 03 DW_LNS_advance_line (34)
+0x000001ab: 01 DW_LNS_copy
+            0x00000000000000a2     34      3      1   0             0  is_stmt
+
+
+0x000001ac: 00 DW_LNE_set_address (0x00000000000000ac)
+0x000001b3: 00 DW_LNE_end_sequence
+            0x00000000000000ac     34      3      1   0             0  is_stmt end_sequence
+
+
+.debug_str contents:
+0x00000000: "clang version 11.0.0 (/b/s/w/ir/cache/git/chromium.googlesource.com-external-github.com-llvm-llvm--project d6fe253653b7e760f94ca21d0a7ebbfeeee28777)"
+0x00000095: "/tmp/emscripten_test_wasm3_2u9tontv/src.cpp"
+0x000000c1: "/tmp/emscripten_test_wasm3_2u9tontv"
+0x000000e5: "rng1"
+0x000000ea: "last"
+0x000000ef: "unsigned int"
+0x000000fc: "Random"
+0x00000103: "_ZN6Random3getEf"
+0x00000114: "get"
+0x00000118: "float"
+0x0000011e: "IM"
+0x00000121: "IA"
+0x00000124: "IC"
+0x00000127: "std"
+0x0000012b: "decltype(nullptr)"
+0x0000013d: "nullptr_t"
+0x00000147: "this"
+0x0000014c: "max"
+0x00000150: "main"
+0x00000155: "int"
+0x00000159: "rng2"
+0x0000015e: "count"
+0x00000164: "i"
+0x00000166: "x2"
+0x00000169: "x1"
+
+.debug_ranges contents:
+00000000 00000000 00000001
+00000000 0000005b 00000064
+00000000 <End of list>
diff --git a/test/passes/class_with_dwarf_noprint.passes b/test/passes/class_with_dwarf_noprint.passes
new file mode 100644
index 000000000..8b1cab885
--- /dev/null
+++ b/test/passes/class_with_dwarf_noprint.passes
@@ -0,0 +1 @@
+roundtrip_dwarfdump_g
diff --git a/test/passes/class_with_dwarf_noprint.wasm b/test/passes/class_with_dwarf_noprint.wasm
new file mode 100644
index 000000000..23a3cc212
--- /dev/null
+++ b/test/passes/class_with_dwarf_noprint.wasm