From owner-svn-src-all@freebsd.org Sat Aug 22 10:55:56 2020 Return-Path: Delivered-To: svn-src-all@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 0394B3B64BF; Sat, 22 Aug 2020 10:55:56 +0000 (UTC) (envelope-from dim@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4BYb0C61lZz4T14; Sat, 22 Aug 2020 10:55:55 +0000 (UTC) (envelope-from dim@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id AEB0815518; Sat, 22 Aug 2020 10:55:55 +0000 (UTC) (envelope-from dim@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 07MAttQL064581; Sat, 22 Aug 2020 10:55:55 GMT (envelope-from dim@FreeBSD.org) Received: (from dim@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 07MAttx7064580; Sat, 22 Aug 2020 10:55:55 GMT (envelope-from dim@FreeBSD.org) Message-Id: <202008221055.07MAttx7064580@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: dim set sender to dim@FreeBSD.org using -f From: Dimitry Andric Date: Sat, 22 Aug 2020 10:55:55 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r364480 - head/contrib/llvm-project/lldb/source/Target X-SVN-Group: head X-SVN-Commit-Author: dim X-SVN-Commit-Paths: head/contrib/llvm-project/lldb/source/Target X-SVN-Commit-Revision: 364480 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 22 Aug 2020 10:55:56 -0000 Author: dim Date: Sat Aug 22 10:55:55 2020 New Revision: 364480 URL: https://svnweb.freebsd.org/changeset/base/364480 Log: 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 Modified: head/contrib/llvm-project/lldb/source/Target/Target.cpp Modified: head/contrib/llvm-project/lldb/source/Target/Target.cpp ============================================================================== --- head/contrib/llvm-project/lldb/source/Target/Target.cpp Sat Aug 22 07:43:38 2020 (r364479) +++ head/contrib/llvm-project/lldb/source/Target/Target.cpp Sat Aug 22 10:55:55 2020 (r364480) @@ -2401,21 +2401,13 @@ lldb::addr_t Target::GetPersistentSymbol(ConstString n llvm::Expected 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("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( - "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 Target::GetEntry 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( + "No primary executable found and could not find entry point address in " + "any executable module", + llvm::inconvertibleErrorCode()); + + return llvm::make_error( + "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,