Summary: | gdb cannot handle operator= if both const access (as rhs) and non-const (lhs) methods defined | ||
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Product: | gdb | Reporter: | Richard Sharman <richard_sharman> |
Component: | c++ | Assignee: | Not yet assigned to anyone <unassigned> |
Status: | RESOLVED FIXED | ||
Severity: | normal | CC: | ssbssa |
Priority: | P2 | ||
Version: | 7.10 | ||
Target Milestone: | 8.0 | ||
Host: | Target: | ||
Build: | Last reconfirmed: | ||
Attachments: | Simple file to demonstrate the problem |
Description
Richard Sharman
2015-10-05 18:11:09 UTC
Created attachment 8681 [details]
Simple file to demonstrate the problem
If a class is defined with a single operator[] method, then gdb can invoke this method with the normal x[i] syntax. If, however, there are separate const "rhs" and non-const "lhs" methods defined, then trying to print or assign using x[i] syntax produces the message "Could not find operator[].". See example t.c. When compiled as is (SEPARATE_SUB_METHODS defined) there are methods const T& operator[](const int index) const and T& operator[](const int index) { Running gdb shows: (gdb) b 53 Breakpoint 1 at 0x40076a: file t.cc, line 53. (gdb) r (gdb) p x $1 = {storage = {10, 20, 30, 40, 50, 60, 70, 80, 90, 100}} (gdb) p x[3] Could not find operator[]. (gdb) show version GNU gdb (GDB) 7.10 Copyright (C) 2015 Free Software Foundation, Inc. When SEPARATE_SUB_METHODS is undefined there is only one method T& operator[](const int index) { and gdb works fine with this: (gdb) b 53 Breakpoint 1 at 0x40076a: file t2.cc, line 53. (gdb) r Starting program: /localhome/sharman/tmp/c++test/t2 Breakpoint 1, main (NameError: Installation error: gdb.execute_unwinders function is missing argc=1, argv=0x7fffffffdbc8) at t2.cc:53 53 printf("%2d: %d\n", i, x[i]); (gdb) p x $1 = {storage = {10, 20, 30, 40, 50, 60, 70, 80, 90, 100}} (gdb) p x[3] NameError: Installation error: gdb.execute_unwinders function is missing $2 = (int &) @0x7fffffffdab8: 30 (gdb) set var x[3] = 33 (gdb) p x[3] $3 = (int &) @0x7fffffffdab8: 33 (gdb) p x $4 = {storage = {10, 20, 33, 40, 50, 60, 70, 80, 90, 100}} (gdb) Works since version gdb-8.0. |