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authorDimitry Andric <dim@FreeBSD.org>2020-08-22 10:55:55 +0000
committerDimitry Andric <dim@FreeBSD.org>2020-08-22 10:55:55 +0000
commit1e991466c33e8d68026e919ae2551223395bbb3e (patch)
treeb58ec21b89604cb09282ce52c05db46d719a4a11 /contrib/llvm-project/lldb
parentc93d310f87289f59c8dd601651141c2bac54eb3a (diff)
downloadsrc-1e991466c33e8d68026e919ae2551223395bbb3e.tar.gz
src-1e991466c33e8d68026e919ae2551223395bbb3e.zip
Merge commit 1ce07cd614be from llvm git (by me):
Instantiate Error in Target::GetEntryPointAddress() only when necessary When Target::GetEntryPointAddress() calls exe_module->GetObjectFile()->GetEntryPointAddress(), and the returned entry_addr is valid, it can immediately be returned. However, just before that, an llvm::Error value has been setup, but in this case it is not consumed before returning, like is done further below in the function. In https://bugs.freebsd.org/248745 we got a bug report for this, where a very simple test case aborts and dumps core: * thread #1, name = 'testcase', stop reason = breakpoint 1.1 frame #0: 0x00000000002018d4 testcase`main(argc=1, argv=0x00007fffffffea18) at testcase.c:3:5 1 int main(int argc, char *argv[]) 2 { -> 3 return 0; 4 } (lldb) p argc Program aborted due to an unhandled Error: Error value was Success. (Note: Success values must still be checked prior to being destroyed). Thread 1 received signal SIGABRT, Aborted. thr_kill () at thr_kill.S:3 3 thr_kill.S: No such file or directory. (gdb) bt #0 thr_kill () at thr_kill.S:3 #1 0x00000008049a0004 in __raise (s=6) at /usr/src/lib/libc/gen/raise.c:52 #2 0x0000000804916229 in abort () at /usr/src/lib/libc/stdlib/abort.c:67 #3 0x000000000451b5f5 in fatalUncheckedError () at /usr/src/contrib/llvm-project/llvm/lib/Support/Error.cpp:112 #4 0x00000000019cf008 in GetEntryPointAddress () at /usr/src/contrib/llvm-project/llvm/include/llvm/Support/Error.h:267 #5 0x0000000001bccbd8 in ConstructorSetup () at /usr/src/contrib/llvm-project/lldb/source/Target/ThreadPlanCallFunction.cpp:67 #6 0x0000000001bcd2c0 in ThreadPlanCallFunction () at /usr/src/contrib/llvm-project/lldb/source/Target/ThreadPlanCallFunction.cpp:114 #7 0x00000000020076d4 in InferiorCallMmap () at /usr/src/contrib/llvm-project/lldb/source/Plugins/Process/Utility/InferiorCallPOSIX.cpp:97 #8 0x0000000001f4be33 in DoAllocateMemory () at /usr/src/contrib/llvm-project/lldb/source/Plugins/Process/FreeBSD/ProcessFreeBSD.cpp:604 #9 0x0000000001fe51b9 in AllocatePage () at /usr/src/contrib/llvm-project/lldb/source/Target/Memory.cpp:347 #10 0x0000000001fe5385 in AllocateMemory () at /usr/src/contrib/llvm-project/lldb/source/Target/Memory.cpp:383 #11 0x0000000001974da2 in AllocateMemory () at /usr/src/contrib/llvm-project/lldb/source/Target/Process.cpp:2301 #12 CanJIT () at /usr/src/contrib/llvm-project/lldb/source/Target/Process.cpp:2331 #13 0x0000000001a1bf3d in Evaluate () at /usr/src/contrib/llvm-project/lldb/source/Expression/UserExpression.cpp:190 #14 0x00000000019ce7a2 in EvaluateExpression () at /usr/src/contrib/llvm-project/lldb/source/Target/Target.cpp:2372 #15 0x0000000001ad784c in EvaluateExpression () at /usr/src/contrib/llvm-project/lldb/source/Commands/CommandObjectExpression.cpp:414 #16 0x0000000001ad86ae in DoExecute () at /usr/src/contrib/llvm-project/lldb/source/Commands/CommandObjectExpression.cpp:646 #17 0x0000000001a5e3ed in Execute () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandObject.cpp:1003 #18 0x0000000001a6c4a3 in HandleCommand () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:1762 #19 0x0000000001a6f98c in IOHandlerInputComplete () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:2760 #20 0x0000000001a90b08 in Run () at /usr/src/contrib/llvm-project/lldb/source/Core/IOHandler.cpp:548 #21 0x00000000019a6c6a in ExecuteIOHandlers () at /usr/src/contrib/llvm-project/lldb/source/Core/Debugger.cpp:903 #22 0x0000000001a70337 in RunCommandInterpreter () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:2946 #23 0x0000000001d9d812 in RunCommandInterpreter () at /usr/src/contrib/llvm-project/lldb/source/API/SBDebugger.cpp:1169 #24 0x0000000001918be8 in MainLoop () at /usr/src/contrib/llvm-project/lldb/tools/driver/Driver.cpp:675 #25 0x000000000191a114 in main () at /usr/src/contrib/llvm-project/lldb/tools/driver/Driver.cpp:890 Fix the incorrect error catch by only instantiating an Error object if it is necessary. Reviewed By: JDevlieghere Differential Revision: https://reviews.llvm.org/D86355 This should fix lldb aborting as described in the scenario above. Reported by: dmgk PR: 248745
Notes
Notes: svn path=/head/; revision=364480
Diffstat (limited to 'contrib/llvm-project/lldb')
-rw-r--r--contrib/llvm-project/lldb/source/Target/Target.cpp31
1 files changed, 15 insertions, 16 deletions
diff --git a/contrib/llvm-project/lldb/source/Target/Target.cpp b/contrib/llvm-project/lldb/source/Target/Target.cpp
index dad56376005c..707344f99fcb 100644
--- a/contrib/llvm-project/lldb/source/Target/Target.cpp
+++ b/contrib/llvm-project/lldb/source/Target/Target.cpp
@@ -2401,21 +2401,13 @@ lldb::addr_t Target::GetPersistentSymbol(ConstString name) {
llvm::Expected<lldb_private::Address> Target::GetEntryPointAddress() {
Module *exe_module = GetExecutableModulePointer();
- llvm::Error error = llvm::Error::success();
- assert(!error); // Check the success value when assertions are enabled.
- if (!exe_module || !exe_module->GetObjectFile()) {
- error = llvm::make_error<llvm::StringError>("No primary executable found",
- llvm::inconvertibleErrorCode());
- } else {
+ // Try to find the entry point address in the primary executable.
+ const bool has_primary_executable = exe_module && exe_module->GetObjectFile();
+ if (has_primary_executable) {
Address entry_addr = exe_module->GetObjectFile()->GetEntryPointAddress();
if (entry_addr.IsValid())
return entry_addr;
-
- error = llvm::make_error<llvm::StringError>(
- "Could not find entry point address for executable module \"" +
- exe_module->GetFileSpec().GetFilename().GetStringRef() + "\"",
- llvm::inconvertibleErrorCode());
}
const ModuleList &modules = GetImages();
@@ -2426,14 +2418,21 @@ llvm::Expected<lldb_private::Address> Target::GetEntryPointAddress() {
continue;
Address entry_addr = module_sp->GetObjectFile()->GetEntryPointAddress();
- if (entry_addr.IsValid()) {
- // Discard the error.
- llvm::consumeError(std::move(error));
+ if (entry_addr.IsValid())
return entry_addr;
- }
}
- return std::move(error);
+ // We haven't found the entry point address. Return an appropriate error.
+ if (!has_primary_executable)
+ return llvm::make_error<llvm::StringError>(
+ "No primary executable found and could not find entry point address in "
+ "any executable module",
+ llvm::inconvertibleErrorCode());
+
+ return llvm::make_error<llvm::StringError>(
+ "Could not find entry point address for primary executable module \"" +
+ exe_module->GetFileSpec().GetFilename().GetStringRef() + "\"",
+ llvm::inconvertibleErrorCode());
}
lldb::addr_t Target::GetCallableLoadAddress(lldb::addr_t load_addr,