Fix low_pc updating when the expression is right at the start (#3175)

In that case LLVM emits the address of the declarations area (where locals are
declared) of the function, which is even earlier than the instructions actual
first byte. I'm not sure why it does this, but it's easy to handle.

4 files changed, 507 insertions, 1 deletions

diff --git a/src/wasm/wasm-debug.cpp b/src/wasm/wasm-debug.cpp
index c8e8c07a4..0f37374b5 100644
--- a/src/wasm/wasm-debug.cpp
+++ b/src/wasm/wasm-debug.cpp
@@ -787,7 +787,7 @@ static void updateDIE(const llvm::DWARFDebugInfoEntry& DIE,
             tag == llvm::dwarf::DW_TAG_inlined_subroutine ||
             tag == llvm::dwarf::DW_TAG_lexical_block ||
             tag == llvm::dwarf::DW_TAG_label) {
-          newValue = locationUpdater.getNewExprStart(oldValue);
+          newValue = locationUpdater.getNewStart(oldValue);
         } else if (tag == llvm::dwarf::DW_TAG_compile_unit) {
           newValue = locationUpdater.getNewFuncStart(oldValue);
           // Per the DWARF spec, "The base address of a compile unit is
diff --git a/test/passes/inlined_to_start_dwarf.bin.txt b/test/passes/inlined_to_start_dwarf.bin.txt
new file mode 100644
index 000000000..7b8694021
--- /dev/null
+++ b/test/passes/inlined_to_start_dwarf.bin.txt
@@ -0,0 +1,505 @@
+DWARF debug info
+================
+
+Contains section .debug_info (321 bytes)
+Contains section .debug_loc (104 bytes)
+Contains section .debug_ranges (32 bytes)
+Contains section .debug_abbrev (206 bytes)
+Contains section .debug_line (151 bytes)
+Contains section .debug_str (217 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_ranges	DW_FORM_sec_offset
+
+[2] 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_abstract_origin	DW_FORM_ref4
+
+[3] DW_TAG_formal_parameter	DW_CHILDREN_no
+	DW_AT_abstract_origin	DW_FORM_ref4
+
+[4] DW_TAG_variable	DW_CHILDREN_no
+	DW_AT_location	DW_FORM_sec_offset
+	DW_AT_abstract_origin	DW_FORM_ref4
+
+[5] 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_external	DW_FORM_flag_present
+	DW_AT_inline	DW_FORM_data1
+
+[6] 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
+
+[7] DW_TAG_variable	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
+
+[8] 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
+
+[9] 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_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_external	DW_FORM_flag_present
+
+[10] 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
+
+[11] 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
+
+[12] 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
+
+[13] DW_TAG_GNU_call_site	DW_CHILDREN_no
+	DW_AT_low_pc	DW_FORM_addr
+
+[14] DW_TAG_pointer_type	DW_CHILDREN_no
+	DW_AT_type	DW_FORM_ref4
+
+
+.debug_info contents:
+0x00000000: Compile Unit: length = 0x0000013d version = 0x0004 abbr_offset = 0x0000 addr_size = 0x04 (next unit at 0x00000141)
+
+0x0000000b: DW_TAG_compile_unit [1] *
+              DW_AT_producer [DW_FORM_strp]	( .debug_str[0x00000000] = "clang version 12.0.0 (https://github.com/llvm/llvm-project.git 132f29ce0611754e0ffb2b534c34b2ffe27b40a8)")
+              DW_AT_language [DW_FORM_data2]	(DW_LANG_C_plus_plus_14)
+              DW_AT_name [DW_FORM_strp]	( .debug_str[0x00000069] = "a.cpp")
+              DW_AT_stmt_list [DW_FORM_sec_offset]	(0x00000000)
+              DW_AT_comp_dir [DW_FORM_strp]	( .debug_str[0x0000006f] = "/home/azakai/Dev/emscripten")
+              DW_AT_low_pc [DW_FORM_addr]	(0x0000000000000000)
+              DW_AT_ranges [DW_FORM_sec_offset]	(0x00000000
+                 [0x00000000, 0x00000007)
+                 [0x00000005, 0x00000012)
+                 [0x00000013, 0x0000001b))
+
+0x00000026:   DW_TAG_subprogram [2] *
+                DW_AT_low_pc [DW_FORM_addr]	(0x0000000000000000)
+                DW_AT_high_pc [DW_FORM_data4]	(0x00000000)
+                DW_AT_frame_base [DW_FORM_exprloc]	(DW_OP_WASM_location 0x3 +0, <decoding error> 00 00 9f)
+                DW_AT_GNU_all_call_sites [DW_FORM_flag_present]	(true)
+                DW_AT_abstract_origin [DW_FORM_ref4]	(cu + 0x004a => {0x0000004a} "_Z6squarei")
+
+0x0000003b:     DW_TAG_formal_parameter [3]  
+                  DW_AT_abstract_origin [DW_FORM_ref4]	(cu + 0x005a => {0x0000005a} "x")
+
+0x00000040:     DW_TAG_variable [4]  
+                  DW_AT_location [DW_FORM_sec_offset]	(0x00000000: 
+                     [0xffffffff,  0x00000006): 
+                     [0x00000001,  0x00000001): DW_OP_WASM_location 0x2 +0, DW_OP_stack_value)
+                  DW_AT_abstract_origin [DW_FORM_ref4]	(cu + 0x0065 => {0x00000065} "result")
+
+0x00000049:     NULL
+
+0x0000004a:   DW_TAG_subprogram [5] *
+                DW_AT_linkage_name [DW_FORM_strp]	( .debug_str[0x0000008b] = "_Z6squarei")
+                DW_AT_name [DW_FORM_strp]	( .debug_str[0x00000096] = "square")
+                DW_AT_decl_file [DW_FORM_data1]	("/home/azakai/Dev/emscripten/a.cpp")
+                DW_AT_decl_line [DW_FORM_data1]	(1)
+                DW_AT_type [DW_FORM_ref4]	(cu + 0x0071 => {0x00000071} "int")
+                DW_AT_external [DW_FORM_flag_present]	(true)
+                DW_AT_inline [DW_FORM_data1]	(DW_INL_inlined)
+
+0x0000005a:     DW_TAG_formal_parameter [6]  
+                  DW_AT_name [DW_FORM_strp]	( .debug_str[0x000000a1] = "x")
+                  DW_AT_decl_file [DW_FORM_data1]	("/home/azakai/Dev/emscripten/a.cpp")
+                  DW_AT_decl_line [DW_FORM_data1]	(1)
+                  DW_AT_type [DW_FORM_ref4]	(cu + 0x0071 => {0x00000071} "int")
+
+0x00000065:     DW_TAG_variable [7]  
+                  DW_AT_name [DW_FORM_strp]	( .debug_str[0x000000a3] = "result")
+                  DW_AT_decl_file [DW_FORM_data1]	("/home/azakai/Dev/emscripten/a.cpp")
+                  DW_AT_decl_line [DW_FORM_data1]	(2)
+                  DW_AT_type [DW_FORM_ref4]	(cu + 0x0071 => {0x00000071} "int")
+
+0x00000070:     NULL
+
+0x00000071:   DW_TAG_base_type [8]  
+                DW_AT_name [DW_FORM_strp]	( .debug_str[0x0000009d] = "int")
+                DW_AT_encoding [DW_FORM_data1]	(DW_ATE_signed)
+                DW_AT_byte_size [DW_FORM_data1]	(0x04)
+
+0x00000078:   DW_TAG_subprogram [9] *
+                DW_AT_low_pc [DW_FORM_addr]	(0x0000000000000005)
+                DW_AT_high_pc [DW_FORM_data4]	(0x0000000d)
+                DW_AT_frame_base [DW_FORM_exprloc]	(DW_OP_WASM_location 0x3 +0, <decoding error> 00 00 9f)
+                DW_AT_GNU_all_call_sites [DW_FORM_flag_present]	(true)
+                DW_AT_linkage_name [DW_FORM_strp]	( .debug_str[0x000000aa] = "_Z7dsquareii")
+                DW_AT_name [DW_FORM_strp]	( .debug_str[0x000000b7] = "dsquare")
+                DW_AT_decl_file [DW_FORM_data1]	("/home/azakai/Dev/emscripten/a.cpp")
+                DW_AT_decl_line [DW_FORM_data1]	(6)
+                DW_AT_type [DW_FORM_ref4]	(cu + 0x0071 => {0x00000071} "int")
+                DW_AT_external [DW_FORM_flag_present]	(true)
+
+0x00000097:     DW_TAG_formal_parameter [6]  
+                  DW_AT_name [DW_FORM_strp]	( .debug_str[0x000000a1] = "x")
+                  DW_AT_decl_file [DW_FORM_data1]	("/home/azakai/Dev/emscripten/a.cpp")
+                  DW_AT_decl_line [DW_FORM_data1]	(6)
+                  DW_AT_type [DW_FORM_ref4]	(cu + 0x0071 => {0x00000071} "int")
+
+0x000000a2:     DW_TAG_formal_parameter [6]  
+                  DW_AT_name [DW_FORM_strp]	( .debug_str[0x000000c4] = "y")
+                  DW_AT_decl_file [DW_FORM_data1]	("/home/azakai/Dev/emscripten/a.cpp")
+                  DW_AT_decl_line [DW_FORM_data1]	(6)
+                  DW_AT_type [DW_FORM_ref4]	(cu + 0x0071 => {0x00000071} "int")
+
+0x000000ad:     DW_TAG_variable [10]  
+                  DW_AT_location [DW_FORM_sec_offset]	(0x0000001e: 
+                     [0xffffffff,  0x00000010): 
+                     [0x00000000,  0x00000001): DW_OP_WASM_location 0x2 +1, DW_OP_stack_value
+                     [0x00000001,  0x00000001): DW_OP_WASM_location 0x2 +0, DW_OP_stack_value)
+                  DW_AT_name [DW_FORM_strp]	( .debug_str[0x000000c6] = "dsq")
+                  DW_AT_decl_file [DW_FORM_data1]	("/home/azakai/Dev/emscripten/a.cpp")
+                  DW_AT_decl_line [DW_FORM_data1]	(7)
+                  DW_AT_type [DW_FORM_ref4]	(cu + 0x0071 => {0x00000071} "int")
+
+0x000000bc:     DW_TAG_inlined_subroutine [11] *
+                  DW_AT_abstract_origin [DW_FORM_ref4]	(cu + 0x004a => {0x0000004a} "_Z6squarei")
+                  DW_AT_low_pc [DW_FORM_addr]	(0x0000000000000005)
+                  DW_AT_high_pc [DW_FORM_data4]	(0x00000006)
+                  DW_AT_call_file [DW_FORM_data1]	("/home/azakai/Dev/emscripten/a.cpp")
+                  DW_AT_call_line [DW_FORM_data1]	(8)
+                  DW_AT_call_column [DW_FORM_data1]	(0x0a)
+
+0x000000cc:       DW_TAG_formal_parameter [3]  
+                    DW_AT_abstract_origin [DW_FORM_ref4]	(cu + 0x005a => {0x0000005a} "x")
+
+0x000000d1:       NULL
+
+0x000000d2:     DW_TAG_inlined_subroutine [11] *
+                  DW_AT_abstract_origin [DW_FORM_ref4]	(cu + 0x004a => {0x0000004a} "_Z6squarei")
+                  DW_AT_low_pc [DW_FORM_addr]	(0x000000000000000b)
+                  DW_AT_high_pc [DW_FORM_data4]	(0x00000005)
+                  DW_AT_call_file [DW_FORM_data1]	("/home/azakai/Dev/emscripten/a.cpp")
+                  DW_AT_call_line [DW_FORM_data1]	(7)
+                  DW_AT_call_column [DW_FORM_data1]	(0x0d)
+
+0x000000e2:       DW_TAG_formal_parameter [3]  
+                    DW_AT_abstract_origin [DW_FORM_ref4]	(cu + 0x005a => {0x0000005a} "x")
+
+0x000000e7:       NULL
+
+0x000000e8:     NULL
+
+0x000000e9:   DW_TAG_subprogram [12] *
+                DW_AT_low_pc [DW_FORM_addr]	(0x0000000000000013)
+                DW_AT_high_pc [DW_FORM_data4]	(0x00000008)
+                DW_AT_frame_base [DW_FORM_exprloc]	(DW_OP_WASM_location 0x3 +0, <decoding error> 00 00 9f)
+                DW_AT_GNU_all_call_sites [DW_FORM_flag_present]	(true)
+                DW_AT_name [DW_FORM_strp]	( .debug_str[0x000000bf] = "main")
+                DW_AT_decl_file [DW_FORM_data1]	("/home/azakai/Dev/emscripten/a.cpp")
+                DW_AT_decl_line [DW_FORM_data1]	(12)
+                DW_AT_type [DW_FORM_ref4]	(cu + 0x0071 => {0x00000071} "int")
+                DW_AT_external [DW_FORM_flag_present]	(true)
+
+0x00000104:     DW_TAG_formal_parameter [6]  
+                  DW_AT_name [DW_FORM_strp]	( .debug_str[0x000000ca] = "argc")
+                  DW_AT_decl_file [DW_FORM_data1]	("/home/azakai/Dev/emscripten/a.cpp")
+                  DW_AT_decl_line [DW_FORM_data1]	(12)
+                  DW_AT_type [DW_FORM_ref4]	(cu + 0x0071 => {0x00000071} "int")
+
+0x0000010f:     DW_TAG_formal_parameter [6]  
+                  DW_AT_name [DW_FORM_strp]	( .debug_str[0x000000cf] = "argv")
+                  DW_AT_decl_file [DW_FORM_data1]	("/home/azakai/Dev/emscripten/a.cpp")
+                  DW_AT_decl_line [DW_FORM_data1]	(12)
+                  DW_AT_type [DW_FORM_ref4]	(cu + 0x012f => {0x0000012f} "char**")
+
+0x0000011a:     DW_TAG_variable [10]  
+                  DW_AT_location [DW_FORM_sec_offset]	(0x0000004a: 
+                     [0xffffffff,  0x00000000): 
+                     [0x00000001,  0x00000001): DW_OP_WASM_location 0x2 +0, DW_OP_stack_value)
+                  DW_AT_name [DW_FORM_strp]	( .debug_str[0x000000a3] = "result")
+                  DW_AT_decl_file [DW_FORM_data1]	("/home/azakai/Dev/emscripten/a.cpp")
+                  DW_AT_decl_line [DW_FORM_data1]	(13)
+                  DW_AT_type [DW_FORM_ref4]	(cu + 0x0071 => {0x00000071} "int")
+
+0x00000129:     DW_TAG_GNU_call_site [13]  
+                  DW_AT_low_pc [DW_FORM_addr]	(0x0000000000000000)
+
+0x0000012e:     NULL
+
+0x0000012f:   DW_TAG_pointer_type [14]  
+                DW_AT_type [DW_FORM_ref4]	(cu + 0x0134 => {0x00000134} "char*")
+
+0x00000134:   DW_TAG_pointer_type [14]  
+                DW_AT_type [DW_FORM_ref4]	(cu + 0x0139 => {0x00000139} "char")
+
+0x00000139:   DW_TAG_base_type [8]  
+                DW_AT_name [DW_FORM_strp]	( .debug_str[0x000000d4] = "char")
+                DW_AT_encoding [DW_FORM_data1]	(DW_ATE_signed_char)
+                DW_AT_byte_size [DW_FORM_data1]	(0x01)
+
+0x00000140:   NULL
+
+.debug_loc contents:
+0x00000000: 
+            [0xffffffff,  0x00000006): 
+            [0x00000001,  0x00000001): DW_OP_WASM_location 0x2 +0, DW_OP_stack_value
+
+0x0000001e: 
+            [0xffffffff,  0x00000010): 
+            [0x00000000,  0x00000001): DW_OP_WASM_location 0x2 +1, DW_OP_stack_value
+            [0x00000001,  0x00000001): DW_OP_WASM_location 0x2 +0, DW_OP_stack_value
+
+0x0000004a: 
+            [0xffffffff,  0x00000000): 
+            [0x00000001,  0x00000001): DW_OP_WASM_location 0x2 +0, DW_OP_stack_value
+
+.debug_line contents:
+debug_line[0x00000000]
+Line table prologue:
+    total_length: 0x00000093
+         version: 4
+ prologue_length: 0x0000001d
+ 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
+file_names[  1]:
+           name: "a.cpp"
+      dir_index: 0
+       mod_time: 0x00000000
+         length: 0x00000000
+0x00000027: 00 DW_LNE_set_address (0x0000000000000005)
+0x0000002e: 03 DW_LNS_advance_line (6)
+0x00000030: 01 DW_LNS_copy
+            0x0000000000000005      6      0      1   0             0  is_stmt
+
+
+0x00000031: 00 DW_LNE_set_address (0x0000000000000006)
+0x00000038: 03 DW_LNS_advance_line (2)
+0x0000003a: 05 DW_LNS_set_column (18)
+0x0000003c: 0a DW_LNS_set_prologue_end
+0x0000003d: 01 DW_LNS_copy
+            0x0000000000000006      2     18      1   0             0  is_stmt prologue_end
+
+
+0x0000003e: 00 DW_LNE_set_address (0x000000000000000b)
+0x00000045: 06 DW_LNS_negate_stmt
+0x00000046: 01 DW_LNS_copy
+            0x000000000000000b      2     18      1   0             0 
+
+
+0x00000047: 00 DW_LNE_set_address (0x0000000000000010)
+0x0000004e: 03 DW_LNS_advance_line (8)
+0x00000050: 05 DW_LNS_set_column (7)
+0x00000052: 06 DW_LNS_negate_stmt
+0x00000053: 01 DW_LNS_copy
+            0x0000000000000010      8      7      1   0             0  is_stmt
+
+
+0x00000054: 00 DW_LNE_set_address (0x0000000000000011)
+0x0000005b: 03 DW_LNS_advance_line (9)
+0x0000005d: 05 DW_LNS_set_column (3)
+0x0000005f: 01 DW_LNS_copy
+            0x0000000000000011      9      3      1   0             0  is_stmt
+
+
+0x00000060: 00 DW_LNE_set_address (0x0000000000000012)
+0x00000067: 00 DW_LNE_end_sequence
+            0x0000000000000012      9      3      1   0             0  is_stmt end_sequence
+
+0x0000006a: 00 DW_LNE_set_address (0x0000000000000013)
+0x00000071: 03 DW_LNS_advance_line (12)
+0x00000073: 01 DW_LNS_copy
+            0x0000000000000013     12      0      1   0             0  is_stmt
+
+
+0x00000074: 00 DW_LNE_set_address (0x0000000000000018)
+0x0000007b: 03 DW_LNS_advance_line (13)
+0x0000007d: 05 DW_LNS_set_column (16)
+0x0000007f: 0a DW_LNS_set_prologue_end
+0x00000080: 01 DW_LNS_copy
+            0x0000000000000018     13     16      1   0             0  is_stmt prologue_end
+
+
+0x00000081: 00 DW_LNE_set_address (0x000000000000001a)
+0x00000088: 03 DW_LNS_advance_line (14)
+0x0000008a: 05 DW_LNS_set_column (3)
+0x0000008c: 01 DW_LNS_copy
+            0x000000000000001a     14      3      1   0             0  is_stmt
+
+
+0x0000008d: 00 DW_LNE_set_address (0x000000000000001b)
+0x00000094: 00 DW_LNE_end_sequence
+            0x000000000000001b     14      3      1   0             0  is_stmt end_sequence
+
+
+.debug_str contents:
+0x00000000: "clang version 12.0.0 (https://github.com/llvm/llvm-project.git 132f29ce0611754e0ffb2b534c34b2ffe27b40a8)"
+0x00000069: "a.cpp"
+0x0000006f: "/home/azakai/Dev/emscripten"
+0x0000008b: "_Z6squarei"
+0x00000096: "square"
+0x0000009d: "int"
+0x000000a1: "x"
+0x000000a3: "result"
+0x000000aa: "_Z7dsquareii"
+0x000000b7: "dsquare"
+0x000000bf: "main"
+0x000000c4: "y"
+0x000000c6: "dsq"
+0x000000ca: "argc"
+0x000000cf: "argv"
+0x000000d4: "char"
+
+.debug_ranges contents:
+00000000 00000000 00000007
+00000000 00000005 00000012
+00000000 00000013 0000001b
+00000000 <End of list>
+(module
+ (type $none_=>_i32 (func (result i32)))
+ (type $i32_i32_=>_i32 (func (param i32 i32) (result i32)))
+ (type $none_=>_none (func))
+ (type $i32_=>_none (func (param i32)))
+ (type $i32_=>_i32 (func (param i32) (result i32)))
+ (import "env" "memory" (memory $0 256 256))
+ (data (i32.const 1024) "\00\00\00\00")
+ (table $0 1 1 funcref)
+ (global $global$0 (mut i32) (i32.const 5243920))
+ (global $global$1 i32 (i32.const 1028))
+ (export "__indirect_function_table" (table $0))
+ (export "__wasm_call_ctors" (func $__wasm_call_ctors))
+ (export "main" (func $main))
+ (export "__errno_location" (func $__errno_location))
+ (export "stackSave" (func $stackSave))
+ (export "stackRestore" (func $stackRestore))
+ (export "stackAlloc" (func $stackAlloc))
+ (export "__data_end" (global $global$1))
+ (func $__wasm_call_ctors
+ )
+ (func $dsquare\28int\2c\20int\29 (param $0 i32) (param $1 i32) (result i32)
+  ;; code offset: 0x10
+  (i32.add
+   ;; code offset: 0xa
+   (i32.mul
+    ;; code offset: 0x6
+    (local.get $1)
+    ;; code offset: 0x8
+    (local.get $1)
+   )
+   ;; code offset: 0xf
+   (i32.mul
+    ;; code offset: 0xb
+    (local.get $0)
+    ;; code offset: 0xd
+    (local.get $0)
+   )
+  )
+ )
+ (func $main (param $0 i32) (param $1 i32) (result i32)
+  ;; code offset: 0x18
+  (call $dsquare\28int\2c\20int\29
+   ;; code offset: 0x14
+   (i32.const 6)
+   ;; code offset: 0x16
+   (i32.const 8)
+  )
+ )
+ (func $stackSave (result i32)
+  ;; code offset: 0x1d
+  (global.get $global$0)
+ )
+ (func $stackRestore (param $0 i32)
+  ;; code offset: 0x24
+  (global.set $global$0
+   ;; code offset: 0x22
+   (local.get $0)
+  )
+ )
+ (func $stackAlloc (param $0 i32) (result i32)
+  (local $1 i32)
+  (local $2 i32)
+  ;; code offset: 0x37
+  (global.set $global$0
+   ;; code offset: 0x35
+   (local.tee $1
+    ;; code offset: 0x34
+    (i32.and
+     ;; code offset: 0x31
+     (i32.sub
+      ;; code offset: 0x2d
+      (global.get $global$0)
+      ;; code offset: 0x2f
+      (local.get $0)
+     )
+     ;; code offset: 0x32
+     (i32.const -16)
+    )
+   )
+  )
+  ;; code offset: 0x39
+  (local.get $1)
+ )
+ (func $__errno_location (result i32)
+  ;; code offset: 0x3e
+  (i32.const 1024)
+ )
+ ;; custom section ".debug_info", size 321
+ ;; custom section ".debug_loc", size 104
+ ;; custom section ".debug_ranges", size 32
+ ;; custom section ".debug_abbrev", size 206
+ ;; custom section ".debug_line", size 151
+ ;; custom section ".debug_str", size 217
+)
diff --git a/test/passes/inlined_to_start_dwarf.passes b/test/passes/inlined_to_start_dwarf.passes
new file mode 100644
index 000000000..911e02345
--- /dev/null
+++ b/test/passes/inlined_to_start_dwarf.passes
@@ -0,0 +1 @@
+g_roundtrip_dwarfdump
diff --git a/test/passes/inlined_to_start_dwarf.wasm b/test/passes/inlined_to_start_dwarf.wasm
new file mode 100755
index 000000000..3ec76a9f9
--- /dev/null
+++ b/test/passes/inlined_to_start_dwarf.wasm