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lldb: propagate error to user if memory read fails

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Previously, an attempt to read an unreadable access reported zeros:

(lldb) memory read -format hex -size 8 0
0x00000000: 0x0000000000000000 0x0000000000000000
0x00000010: 0x0000000000000000 0x0000000000000000
...

Now, if DoReadMemory encounters error then return 0 (bytes read) so we
report the error to the user:

(lldb) memory read -format hex -size 8 0
error: Bad address

LLVM PR:	37190

MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Ed Maste 2018-04-21 00:34:46 +00:00
parent daddfa7cc7
commit 69dcf941a4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=332849
1 changed files with 3 additions and 1 deletions
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4
contrib/llvm/tools/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.cpp
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@ -163,8 +163,10 @@ static size_t DoReadMemory(lldb::pid_t pid, lldb::addr_t vm_addr, void *buf,
pi_desc.piod_addr = buf;
pi_desc.piod_len = size;
if (PTRACE(PT_IO, pid, (caddr_t)&pi_desc, 0) < 0)
if (PTRACE(PT_IO, pid, (caddr_t)&pi_desc, 0) < 0) {
error.SetErrorToErrno();
return 0;
}
return pi_desc.piod_len;
}