mxms0 wrote:
Sorry for the delay. For this sample program:
```c
void use(void *);
void test_memset(void) {
char array[24] = { 0 };
use(array);
}
void test_memcpy(void) {
char array[24] = { 1, 2, 3 };
use(array);
}
```
`clang -O2 -g -c sample.c -o sample.o` then `llvm-dwarfdump --debug-info
--debug-line`
Here's the diff in the dwarf:
```diff
--- before.dwarfdump
+++ after.dwarfdump
@@ -1,7 +1,7 @@
sample.o: file format Mach-O arm64
.debug_info contents:
-0x00000000: Compile Unit: length = 0x00000088, format = DWARF32, version =
0x0005, unit_type = DW_UT_compile, abbr_offset = 0x0000, addr_size = 0x08 (next
unit at 0x0000008c)
+0x00000000: Compile Unit: length = 0x000000a6, format = DWARF32, version =
0x0005, unit_type = DW_UT_compile, abbr_offset = 0x0000, addr_size = 0x08 (next
unit at 0x000000aa)
0x0000000c: DW_TAG_compile_unit
DW_AT_producer ("clang version 24.0.0git")
@@ -17,6 +17,12 @@
DW_AT_addr_base (0x00000008)
0x00000024: DW_TAG_subprogram
+ DW_AT_name ("memset")
+ DW_AT_artificial (true)
+ DW_AT_external (true)
+ DW_AT_inline (DW_INL_inlined)
+
+0x00000026: DW_TAG_subprogram
DW_AT_low_pc (0x0000000000000000)
DW_AT_high_pc (0x0000000000000054)
DW_AT_frame_base (DW_OP_reg29 W29)
@@ -28,26 +34,34 @@
DW_AT_external (true)
DW_AT_APPLE_optimized (true)
-0x0000002f: DW_TAG_variable
+0x00000031: DW_TAG_variable
DW_AT_location (DW_OP_breg31 WSP+0)
DW_AT_name ("array")
DW_AT_decl_file ("./sample.c")
DW_AT_decl_line (4)
- DW_AT_type (0x00000077 "char[24]")
+ DW_AT_type (0x00000095 "char[24]")
-0x0000003a: DW_TAG_call_site
- DW_AT_call_origin (0x00000048 "use")
+0x0000003c: DW_TAG_inlined_subroutine
+ DW_AT_abstract_origin (0x00000024 "memset")
+ DW_AT_low_pc (0x000000000000001c)
+ DW_AT_high_pc (0x0000000000000024)
+ DW_AT_call_file ("./sample.c")
+ DW_AT_call_line (4)
+ DW_AT_call_column (8)
+
+0x00000049: DW_TAG_call_site
+ DW_AT_call_origin (0x00000057 "use")
DW_AT_call_return_pc (0x000000000000002c)
-0x00000040: DW_TAG_call_site_parameter
+0x0000004f: DW_TAG_call_site_parameter
DW_AT_location (DW_OP_reg0 W0)
DW_AT_call_value (DW_OP_breg31 WSP+0)
-0x00000046: NULL
+0x00000055: NULL
-0x00000047: NULL
+0x00000056: NULL
-0x00000048: DW_TAG_subprogram
+0x00000057: DW_TAG_subprogram
DW_AT_name ("use")
DW_AT_decl_file ("./sample.c")
DW_AT_decl_line (1)
@@ -56,14 +70,20 @@
DW_AT_external (true)
DW_AT_APPLE_optimized (true)
-0x0000004c: DW_TAG_formal_parameter
- DW_AT_type (0x00000052 "void *")
+0x0000005b: DW_TAG_formal_parameter
+ DW_AT_type (0x00000061 "void *")
-0x00000051: NULL
+0x00000060: NULL
-0x00000052: DW_TAG_pointer_type
+0x00000061: DW_TAG_pointer_type
-0x00000053: DW_TAG_subprogram
+0x00000062: DW_TAG_subprogram
+ DW_AT_name ("memcpy")
+ DW_AT_artificial (true)
+ DW_AT_external (true)
+ DW_AT_inline (DW_INL_inlined)
+
+0x00000064: DW_TAG_subprogram
DW_AT_low_pc (0x0000000000000054)
DW_AT_high_pc (0x00000000000000b4)
DW_AT_frame_base (DW_OP_reg29 W29)
@@ -75,50 +95,58 @@
DW_AT_external (true)
DW_AT_APPLE_optimized (true)
-0x0000005e: DW_TAG_variable
+0x0000006f: DW_TAG_variable
DW_AT_location (DW_OP_breg31 WSP+0)
DW_AT_name ("array")
DW_AT_decl_file ("./sample.c")
DW_AT_decl_line (9)
- DW_AT_type (0x00000077 "char[24]")
+ DW_AT_type (0x00000095 "char[24]")
-0x00000069: DW_TAG_call_site
- DW_AT_call_origin (0x00000048 "use")
+0x0000007a: DW_TAG_inlined_subroutine
+ DW_AT_abstract_origin (0x00000062 "memcpy")
+ DW_AT_low_pc (0x0000000000000070)
+ DW_AT_high_pc (0x0000000000000084)
+ DW_AT_call_file ("./sample.c")
+ DW_AT_call_line (9)
+ DW_AT_call_column (8)
+
+0x00000087: DW_TAG_call_site
+ DW_AT_call_origin (0x00000057 "use")
DW_AT_call_return_pc (0x000000000000008c)
-0x0000006f: DW_TAG_call_site_parameter
+0x0000008d: DW_TAG_call_site_parameter
DW_AT_location (DW_OP_reg0 W0)
DW_AT_call_value (DW_OP_breg31 WSP+0)
-0x00000075: NULL
+0x00000093: NULL
-0x00000076: NULL
+0x00000094: NULL
-0x00000077: DW_TAG_array_type
- DW_AT_type (0x00000083 "char")
+0x00000095: DW_TAG_array_type
+ DW_AT_type (0x000000a1 "char")
-0x0000007c: DW_TAG_subrange_type
- DW_AT_type (0x00000087 "__ARRAY_SIZE_TYPE__")
+0x0000009a: DW_TAG_subrange_type
+ DW_AT_type (0x000000a5 "__ARRAY_SIZE_TYPE__")
DW_AT_count (0x18)
-0x00000082: NULL
+0x000000a0: NULL
-0x00000083: DW_TAG_base_type
+0x000000a1: DW_TAG_base_type
DW_AT_name ("char")
DW_AT_encoding (DW_ATE_signed_char)
DW_AT_byte_size (0x01)
-0x00000087: DW_TAG_base_type
+0x000000a5: DW_TAG_base_type
DW_AT_name ("__ARRAY_SIZE_TYPE__")
DW_AT_byte_size (0x08)
DW_AT_encoding (DW_ATE_unsigned)
-0x0000008b: NULL
+0x000000a9: NULL
.debug_line contents:
debug_line[0x00000000]
Line table prologue:
- total_length: 0x00000083
+ total_length: 0x00000087
format: DWARF32
version: 5
address_size: 8
```
https://github.com/llvm/llvm-project/pull/229218
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