https://bugs.llvm.org/show_bug.cgi?id=46833
Bug ID: 46833
Summary: LLDB is missing support for DW_OP_implicit_value dwarf
operation
Product: lldb
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: All Bugs
Assignee: lldb-dev@lists.llvm.org
Reporter: sourav0...@gmail.com
CC: jdevliegh...@apple.com, llvm-b...@lists.llvm.org
LLDB is missing support for DW_OP_implicit_value dwarf operation.
clang was also not supporting this, seems like in some cases
DW_op_implicit_value is indispensable.
Support is added in clang with currently emission restricted for debugger
tunning GDB.
For more details please refer: https://reviews.llvm.org/D83560
For a typical use case compiled as
$tot-clang -ggdb -O1 test.c
or with gcc also
$gcc -ggdb -O1 test.c //GCC uses DW_OP_implicit_value ubiquitously for all
floating point constants.
Error log:
Process 24530 launched: '/hack/a.out' (x86_64)
Process 24530 stopped
* thread #1, name = 'a.out', stop reason = breakpoint 1.1
frame #0: 0x000000000040112a a.out`main at implicit-float.c:3:2
1 int main() {
2 float a = 3.14f;
-> 3 printf("foo\n");
4 a *= a;
5 return 0;
6 }
(lldb) p a
error: Couldn't materialize: couldn't get the value of variable a: Unhandled
opcode DW_OP_implicit_value in DWARFExpression
error: errored out in DoExecute, couldn't PrepareToExecuteJITExpression
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