[debuginfo]the value of DW_OP_deref_size generated by clang is incorrect

[IOVOVHS]

lldb and gdb parse the parameter p_1 of function func_10 incorrectly.

(gdb) s
func10 (p_0=p_0@entry=5, p_1=<error reading variable: That operation is not available on integers of more than 8 bytes.>)
    at /home/hzw/Downloads/debugger-test/gen_progs/1735837458_IuQuWMTj/src_2/prog3.cpp:35
35	    Container_0* var319 = new Container_0(1.0, 2.0)

(lldb) b func10
Breakpoint 1: where = test_case_3`func10(short, double) + 6 at prog3.cpp:10:27, address = 0x0000000000001146
(lldb) r
Process 50488 launched: '/home/hzw/Downloads/test_cases/1735837458_IuQuWMTj/test_case_3/test_case_3' (x86_64)
Process 50488 stopped
* thread #1, name = 'test_case_3', stop reason = breakpoint 1.1
    frame #0: 0x0000555555555146 test_case_3`func10(p_0=5, p_1=<unavailable>) at prog3.cpp:10:27
   7   	    short int var317 = p_0; 
   8   	    int var318 = 10; 
   9   	
-> 10  	    Container_0* var319 = new Container_0(1.0, 2.0); 
   11  	
   12  	    if (p_1 > 0) {
   13  	        double var320 = var319->member_1 + var318;
(lldb) fr v
(short) p_0 = 5
(double) p_1 = <Invalid address size for DW_OP_deref_size: 16
>

(short) var317 = 5
(int) var318 = 10
(Container_0 *) var319 = <variable not available>

cd test_case
clang++ -I  . prog3.cpp test_case3.cpp -O1 -o test_case3 -g
clang++ --version
clang version 19.1.5 (https://github.com/llvm/llvm-project.git ab4b5a2db582958af1ee308a790cfdb42bd24720)
Target: x86_64-unknown-linux-gnu

When this program is compiled on arm64-apple-darwin, lldb can correctly parse the value of p_1. But it behaves incorrectly on Ubuntu.

test_case.zip

[llvmbot]

@llvm/issue-subscribers-debuginfo

Author: None (IOVOVHS)

lldb and gdb parse the parameter p_1 of function func_10 incorrectly.

(gdb) s
func10 (p_0=p_0@<!-- -->entry=5, p_1=&lt;error reading variable: That operation is not available on integers of more than 8 bytes.&gt;)
    at /home/hzw/Downloads/debugger-test/gen_progs/1735837458_IuQuWMTj/src_2/prog3.cpp:35
35	    Container_0* var319 = new Container_0(1.0, 2.0)

(lldb) b func10
Breakpoint 1: where = test_case_3`func10(short, double) + 6 at prog3.cpp:10:27, address = 0x0000000000001146
(lldb) r
Process 50488 launched: '/home/hzw/Downloads/test_cases/1735837458_IuQuWMTj/test_case_3/test_case_3' (x86_64)
Process 50488 stopped
* thread #<!-- -->1, name = 'test_case_3', stop reason = breakpoint 1.1
    frame #<!-- -->0: 0x0000555555555146 test_case_3`func10(p_0=5, p_1=&lt;unavailable&gt;) at prog3.cpp:10:27
   7   	    short int var317 = p_0; 
   8   	    int var318 = 10; 
   9   	
-&gt; 10  	    Container_0* var319 = new Container_0(1.0, 2.0); 
   11  	
   12  	    if (p_1 &gt; 0) {
   13  	        double var320 = var319-&gt;member_1 + var318;
(lldb) fr v
(short) p_0 = 5
(double) p_1 = &lt;Invalid address size for DW_OP_deref_size: 16
&gt;

(short) var317 = 5
(int) var318 = 10
(Container_0 *) var319 = &lt;variable not available&gt;

cd test_case
clang++ -I  . prog3.cpp test_case3.cpp -O1 -o test_case3 -g
clang++ --version
clang version 19.1.5 (https://github.com/llvm/llvm-project.git ab4b5a2db582958af1ee308a790cfdb42bd24720)
Target: x86_64-unknown-linux-gnu

When this program is compiled on arm64-apple-darwin, lldb can correctly parse the value of p_1. But it behaves incorrectly on Ubuntu.

test_case.zip

[llvmbot]

@llvm/issue-subscribers-clang-codegen

Author: None (IOVOVHS)

lldb and gdb parse the parameter p_1 of function func_10 incorrectly.

(gdb) s
func10 (p_0=p_0@<!-- -->entry=5, p_1=&lt;error reading variable: That operation is not available on integers of more than 8 bytes.&gt;)
    at /home/hzw/Downloads/debugger-test/gen_progs/1735837458_IuQuWMTj/src_2/prog3.cpp:35
35	    Container_0* var319 = new Container_0(1.0, 2.0)

(lldb) b func10
Breakpoint 1: where = test_case_3`func10(short, double) + 6 at prog3.cpp:10:27, address = 0x0000000000001146
(lldb) r
Process 50488 launched: '/home/hzw/Downloads/test_cases/1735837458_IuQuWMTj/test_case_3/test_case_3' (x86_64)
Process 50488 stopped
* thread #<!-- -->1, name = 'test_case_3', stop reason = breakpoint 1.1
    frame #<!-- -->0: 0x0000555555555146 test_case_3`func10(p_0=5, p_1=&lt;unavailable&gt;) at prog3.cpp:10:27
   7   	    short int var317 = p_0; 
   8   	    int var318 = 10; 
   9   	
-&gt; 10  	    Container_0* var319 = new Container_0(1.0, 2.0); 
   11  	
   12  	    if (p_1 &gt; 0) {
   13  	        double var320 = var319-&gt;member_1 + var318;
(lldb) fr v
(short) p_0 = 5
(double) p_1 = &lt;Invalid address size for DW_OP_deref_size: 16
&gt;

(short) var317 = 5
(int) var318 = 10
(Container_0 *) var319 = &lt;variable not available&gt;

cd test_case
clang++ -I  . prog3.cpp test_case3.cpp -O1 -o test_case3 -g
clang++ --version
clang version 19.1.5 (https://github.com/llvm/llvm-project.git ab4b5a2db582958af1ee308a790cfdb42bd24720)
Target: x86_64-unknown-linux-gnu

When this program is compiled on arm64-apple-darwin, lldb can correctly parse the value of p_1. But it behaves incorrectly on Ubuntu.

test_case.zip

[jmorse]

Likely a duplicate of issue 64093, which is slowly moving towards something being fixed. Haven't verified this though.