[Lldb-commits] [lldb] r282565 - Refactor the x86 UnwindAssembly class into a separate class called
Jason Molenda via lldb-commits
lldb-commits at lists.llvm.org
Wed Sep 28 13:26:35 PDT 2016
Thanks, I'm real happy to have the time to work on unwinder testing, it's such a complicated subsystem that it's easy to break (and very tricky to test). With this kind of restructuring, unit testing of x86/armv7/arm64 unwind plan creation will be possible which will be great, we've had problems especially with the armv7 unwind plan creation code in the past. Testing UnwindLLDB and RegisterContextLLDB will be trickier - they assume a fully running inferior process with threads and stack frames and memory and live register contexts. We may need to do something else there. I'm toying with the idea of lldb creating very-very-stripped-down core files with just the stack/instruction memory + register context + symbol information needed to show a complicated unwind scenario. Maybe we could get a core file down to hundreds of kilobytes? I don't know if it'll really be possible, but it's worth pursuing.
I had to revert this commit temporarily because I caused a regression on linux but I'll get that fixed today & check it in again.
> On Sep 28, 2016, at 5:30 AM, Pavel Labath <labath at google.com> wrote:
>
> This is really exciting. I've been wanting something like this for a long time. Hopefully with more changes like these we can reduce the number of changes that have to be reverted because they fail on some architecture/os combination and the only way to diagnose is to get the hardware/software in question (fate of this first attempt).
>
> On 28 September 2016 at 03:52, Jason Molenda via lldb-commits <lldb-commits at lists.llvm.org> wrote:
> Author: jmolenda
> Date: Tue Sep 27 21:52:19 2016
> New Revision: 282565
>
> URL: http://llvm.org/viewvc/llvm-project?rev=282565&view=rev
> Log:
> Refactor the x86 UnwindAssembly class into a separate class called
> x86AssemblyInspectionEngine and the current UnwindAssembly_x86 to
> allow for the core engine to be exercised by unit tests.
>
> The UnwindAssembly_x86 class will have access to Targets, Processes,
> Threads, RegisterContexts -- it will be working in the full lldb
> environment.
>
> x86AssemblyInspectionEngine is layered away from all of that, it is
> given some register definitions and a bag of bytes to profile.
>
> I wrote an initial unittest for a do-nothing simple x86_64/i386
> function to start with. I'll be adding more.
>
> The x86 assembly unwinder was added to lldb early in its bringup;
> I made some modernization changes as I was refactoring the code
> to make it more consistent with how we write lldb today.
>
> I also added RegisterContextMinidump_x86_64.cpp to the xcode project
> file so I can run the unittests from that.
>
> The testsuite passes with this change, but there was quite a bit of
> code change by the refactoring and it's possible there are some
> issues. I'll be testing this more in the coming days, but it looks
> like it is behaving correctly as far as I can tell with automated
> testing.
>
> <rdar://problem/28509178>
>
> Added:
> lldb/trunk/source/Plugins/UnwindAssembly/x86/x86AssemblyInspectionEngine.cpp
> lldb/trunk/source/Plugins/UnwindAssembly/x86/x86AssemblyInspectionEngine.h
> lldb/trunk/unittests/UnwindAssembly/
> lldb/trunk/unittests/UnwindAssembly/CMakeLists.txt
> lldb/trunk/unittests/UnwindAssembly/x86/
> lldb/trunk/unittests/UnwindAssembly/x86/CMakeLists.txt
> lldb/trunk/unittests/UnwindAssembly/x86/Testx86AssemblyInspectionEngine.cpp
> Modified:
> lldb/trunk/lldb.xcodeproj/project.pbxproj
> lldb/trunk/source/Plugins/UnwindAssembly/x86/CMakeLists.txt
> lldb/trunk/source/Plugins/UnwindAssembly/x86/UnwindAssembly-x86.cpp
> lldb/trunk/source/Plugins/UnwindAssembly/x86/UnwindAssembly-x86.h
> lldb/trunk/unittests/CMakeLists.txt
>
> Modified: lldb/trunk/lldb.xcodeproj/project.pbxproj
> URL: http://llvm.org/viewvc/llvm-project/lldb/trunk/lldb.xcodeproj/project.pbxproj?rev=282565&r1=282564&r2=282565&view=diff
> ==============================================================================
> --- lldb/trunk/lldb.xcodeproj/project.pbxproj (original)
> +++ lldb/trunk/lldb.xcodeproj/project.pbxproj Tue Sep 27 21:52:19 2016
> @@ -928,6 +928,8 @@
> AF33B4BE1C1FA441001B28D9 /* NetBSDSignals.cpp in Sources */ = {isa = PBXBuildFile; fileRef = AF33B4BC1C1FA441001B28D9 /* NetBSDSignals.cpp */; };
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> AF37E10A17C861F20061E18E /* ProcessRunLock.cpp in Sources */ = {isa = PBXBuildFile; fileRef = AF37E10917C861F20061E18E /* ProcessRunLock.cpp */; };
> + AF415AE71D949E4400FCE0D4 /* x86AssemblyInspectionEngine.cpp in Sources */ = {isa = PBXBuildFile; fileRef = AF415AE51D949E4400FCE0D4 /* x86AssemblyInspectionEngine.cpp */; };
> + AF415AE81D949E4400FCE0D4 /* x86AssemblyInspectionEngine.h in Headers */ = {isa = PBXBuildFile; fileRef = AF415AE61D949E4400FCE0D4 /* x86AssemblyInspectionEngine.h */; };
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> AF6335E31C87B21E00F7D554 /* SymbolFilePDB.h in Headers */ = {isa = PBXBuildFile; fileRef = AF6335E11C87B21E00F7D554 /* SymbolFilePDB.h */; };
> @@ -953,9 +955,12 @@
> AFC234091AF85CE100CDE8B6 /* CommandObjectLanguage.cpp in Sources */ = {isa = PBXBuildFile; fileRef = AFC234061AF85CE000CDE8B6 /* CommandObjectLanguage.cpp */; };
> AFCB2BBD1BF577F40018B553 /* PythonExceptionState.cpp in Sources */ = {isa = PBXBuildFile; fileRef = AFCB2BBB1BF577F40018B553 /* PythonExceptionState.cpp */; };
> AFCB2BBE1BF577F40018B553 /* PythonExceptionState.h in Headers */ = {isa = PBXBuildFile; fileRef = AFCB2BBC1BF577F40018B553 /* PythonExceptionState.h */; };
> + AFD65C811D9B5B2E00D93120 /* RegisterContextMinidump_x86_64.cpp in Sources */ = {isa = PBXBuildFile; fileRef = AFD65C7F1D9B5B2E00D93120 /* RegisterContextMinidump_x86_64.cpp */; };
> + AFD65C821D9B5B2E00D93120 /* RegisterContextMinidump_x86_64.h in Headers */ = {isa = PBXBuildFile; fileRef = AFD65C801D9B5B2E00D93120 /* RegisterContextMinidump_x86_64.h */; };
> AFDCDBCB19DD0F42005EA55E /* SBExecutionContext.h in Headers */ = {isa = PBXBuildFile; fileRef = 940B02F419DC96CB00AD0F52 /* SBExecutionContext.h */; settings = {ATTRIBUTES = (Public, ); }; };
> AFDFDFD119E34D3400EAE509 /* ConnectionFileDescriptorPosix.cpp in Sources */ = {isa = PBXBuildFile; fileRef = AFDFDFD019E34D3400EAE509 /* ConnectionFileDescriptorPosix.cpp */; };
> AFEC3362194A8ABA00FF05C6 /* StructuredData.cpp in Sources */ = {isa = PBXBuildFile; fileRef = AFEC3361194A8ABA00FF05C6 /* StructuredData.cpp */; };
> + AFEC5FD81D94F9380076A480 /* Testx86AssemblyInspectionEngine.cpp in Sources */ = {isa = PBXBuildFile; fileRef = AFEC5FD51D94F9380076A480 /* Testx86AssemblyInspectionEngine.cpp */; };
> AFF87C87150FF669000E1742 /* com.apple.debugserver.plist in CopyFiles */ = {isa = PBXBuildFile; fileRef = AFF87C86150FF669000E1742 /* com.apple.debugserver.plist */; };
> AFF87C8F150FF688000E1742 /* com.apple.debugserver.applist.plist in CopyFiles */ = {isa = PBXBuildFile; fileRef = AFF87C8E150FF688000E1742 /* com.apple.debugserver.applist.plist */; };
> B207C4931429607D00F36E4E /* CommandObjectWatchpoint.cpp in Sources */ = {isa = PBXBuildFile; fileRef = B207C4921429607D00F36E4E /* CommandObjectWatchpoint.cpp */; };
> @@ -2946,6 +2951,8 @@
> AF3F54BF1B3BA5D500186E73 /* RegisterContextPOSIXProcessMonitor_powerpc.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RegisterContextPOSIXProcessMonitor_powerpc.h; sourceTree = "<group>"; };
> AF3F54C01B3BA5D500186E73 /* RegisterContextPOSIXProcessMonitor_x86.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = RegisterContextPOSIXProcessMonitor_x86.cpp; sourceTree = "<group>"; };
> AF3F54C11B3BA5D500186E73 /* RegisterContextPOSIXProcessMonitor_x86.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RegisterContextPOSIXProcessMonitor_x86.h; sourceTree = "<group>"; };
> + AF415AE51D949E4400FCE0D4 /* x86AssemblyInspectionEngine.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = x86AssemblyInspectionEngine.cpp; sourceTree = "<group>"; };
> + AF415AE61D949E4400FCE0D4 /* x86AssemblyInspectionEngine.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = x86AssemblyInspectionEngine.h; sourceTree = "<group>"; };
> AF45E1FC1BF57C8D000563EB /* PythonTestSuite.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = PythonTestSuite.cpp; sourceTree = "<group>"; };
> AF45E1FD1BF57C8D000563EB /* PythonTestSuite.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = PythonTestSuite.h; sourceTree = "<group>"; };
> AF45FDE318A1F3AC0007051C /* AppleGetThreadItemInfoHandler.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = AppleGetThreadItemInfoHandler.cpp; sourceTree = "<group>"; };
> @@ -2992,8 +2999,11 @@
> AFC234071AF85CE000CDE8B6 /* CommandObjectLanguage.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = CommandObjectLanguage.h; path = source/Commands/CommandObjectLanguage.h; sourceTree = "<group>"; };
> AFCB2BBB1BF577F40018B553 /* PythonExceptionState.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = PythonExceptionState.cpp; path = ScriptInterpreter/Python/PythonExceptionState.cpp; sourceTree = "<group>"; };
> AFCB2BBC1BF577F40018B553 /* PythonExceptionState.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = PythonExceptionState.h; path = ScriptInterpreter/Python/PythonExceptionState.h; sourceTree = "<group>"; };
> + AFD65C7F1D9B5B2E00D93120 /* RegisterContextMinidump_x86_64.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = RegisterContextMinidump_x86_64.cpp; sourceTree = "<group>"; };
> + AFD65C801D9B5B2E00D93120 /* RegisterContextMinidump_x86_64.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RegisterContextMinidump_x86_64.h; sourceTree = "<group>"; };
> AFDFDFD019E34D3400EAE509 /* ConnectionFileDescriptorPosix.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = ConnectionFileDescriptorPosix.cpp; sourceTree = "<group>"; };
> AFEC3361194A8ABA00FF05C6 /* StructuredData.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = StructuredData.cpp; path = source/Core/StructuredData.cpp; sourceTree = "<group>"; };
> + AFEC5FD51D94F9380076A480 /* Testx86AssemblyInspectionEngine.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = Testx86AssemblyInspectionEngine.cpp; path = UnwindAssembly/x86/Testx86AssemblyInspectionEngine.cpp; sourceTree = "<group>"; };
> AFF87C86150FF669000E1742 /* com.apple.debugserver.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = com.apple.debugserver.plist; path = tools/debugserver/source/com.apple.debugserver.plist; sourceTree = "<group>"; };
> AFF87C8A150FF677000E1742 /* com.apple.debugserver.applist.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = com.apple.debugserver.applist.plist; path = tools/debugserver/source/com.apple.debugserver.applist.plist; sourceTree = "<group>"; };
> AFF87C8C150FF680000E1742 /* com.apple.debugserver.applist.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = com.apple.debugserver.applist.plist; path = tools/debugserver/source/com.apple.debugserver.applist.plist; sourceTree = "<group>"; };
> @@ -3227,6 +3237,7 @@
> 2321F93F1BDD33D800BA9A93 /* ScriptInterpreter */,
> 23CB15091D66CF2B00EDDDE1 /* Symbol */,
> 23CB150A1D66CF3200EDDDE1 /* SymbolFile */,
> + AFEC5FD31D94F9130076A480 /* UnwindAssembly */,
> 2321F9421BDD343A00BA9A93 /* Utility */,
> );
> path = unittests;
> @@ -3527,6 +3538,8 @@
> 23E2E5351D9048E7006F38BB /* minidump */ = {
> isa = PBXGroup;
> children = (
> + AFD65C7F1D9B5B2E00D93120 /* RegisterContextMinidump_x86_64.cpp */,
> + AFD65C801D9B5B2E00D93120 /* RegisterContextMinidump_x86_64.h */,
> 23E2E5361D9048FB006F38BB /* CMakeLists.txt */,
> 23E2E5371D9048FB006F38BB /* MinidumpParser.cpp */,
> 23E2E5381D9048FB006F38BB /* MinidumpParser.h */,
> @@ -4405,6 +4418,8 @@
> 2692BA17136611CD00F9E14D /* x86 */ = {
> isa = PBXGroup;
> children = (
> + AF415AE51D949E4400FCE0D4 /* x86AssemblyInspectionEngine.cpp */,
> + AF415AE61D949E4400FCE0D4 /* x86AssemblyInspectionEngine.h */,
> 263E949D13661AE400E7D1CE /* UnwindAssembly-x86.cpp */,
> 263E949E13661AE400E7D1CE /* UnwindAssembly-x86.h */,
> );
> @@ -6283,6 +6298,22 @@
> name = "SysV-ppc64";
> sourceTree = "<group>";
> };
> + AFEC5FD31D94F9130076A480 /* UnwindAssembly */ = {
> + isa = PBXGroup;
> + children = (
> + AFEC5FD51D94F9380076A480 /* Testx86AssemblyInspectionEngine.cpp */,
> + AFEC5FD41D94F9270076A480 /* x86 */,
> + );
> + name = UnwindAssembly;
> + sourceTree = "<group>";
> + };
> + AFEC5FD41D94F9270076A480 /* x86 */ = {
> + isa = PBXGroup;
> + children = (
> + );
> + name = x86;
> + sourceTree = "<group>";
> + };
> E769331B1A94D10E00C73337 /* lldb-server */ = {
> isa = PBXGroup;
> children = (
> @@ -6400,7 +6431,9 @@
> 4984BA181B979C08008658D4 /* ExpressionVariable.h in Headers */,
> 26C7C4841BFFEA7E009BD01F /* WindowsMiniDump.h in Headers */,
> 30B38A001CAAA6D7009524E3 /* ClangUtil.h in Headers */,
> + AFD65C821D9B5B2E00D93120 /* RegisterContextMinidump_x86_64.h in Headers */,
> 238F2BA11D2C835A001FF92A /* StructuredDataPlugin.h in Headers */,
> + AF415AE81D949E4400FCE0D4 /* x86AssemblyInspectionEngine.h in Headers */,
> AF8AD62F1BEC28A400150209 /* PlatformAppleTVSimulator.h in Headers */,
> 238F2BA91D2C85FA001FF92A /* StructuredDataDarwinLog.h in Headers */,
> AF8AD63A1BEC28C400150209 /* PlatformRemoteAppleWatch.h in Headers */,
> @@ -6890,6 +6923,7 @@
> 23CB153E1D66DA9300EDDDE1 /* PythonDataObjectsTests.cpp in Sources */,
> 23CB153F1D66DA9300EDDDE1 /* SymbolsTest.cpp in Sources */,
> 23E2E52B1D9037E6006F38BB /* ModuleCacheTest.cpp in Sources */,
> + AFEC5FD81D94F9380076A480 /* Testx86AssemblyInspectionEngine.cpp in Sources */,
> 23CB15401D66DA9300EDDDE1 /* TestClangASTContext.cpp in Sources */,
> 23CB15411D66DA9300EDDDE1 /* StringExtractorTest.cpp in Sources */,
> 23CB15421D66DA9300EDDDE1 /* TaskPoolTest.cpp in Sources */,
> @@ -6989,6 +7023,7 @@
> 26D1804216CEDF0700EDFB5B /* TimeSpecTimeout.cpp in Sources */,
> 2689FFDA13353D9D00698AC0 /* lldb.cpp in Sources */,
> 4C0083401B9F9BA900D5CF24 /* UtilityFunction.cpp in Sources */,
> + AF415AE71D949E4400FCE0D4 /* x86AssemblyInspectionEngine.cpp in Sources */,
> 26474CCD18D0CB5B0073DEBA /* RegisterContextPOSIX_x86.cpp in Sources */,
> AEB0E4591BD6E9F800B24093 /* LLVMUserExpression.cpp in Sources */,
> 2689FFEF13353DB600698AC0 /* Breakpoint.cpp in Sources */,
> @@ -7547,6 +7582,7 @@
> 23D0658F1D4A7BEE0008EDE6 /* RenderScriptExpressionOpts.cpp in Sources */,
> 945215DF17F639EE00521C0B /* ValueObjectPrinter.cpp in Sources */,
> 26EFB61B1BFE8D3E00544801 /* PlatformNetBSD.cpp in Sources */,
> + AFD65C811D9B5B2E00D93120 /* RegisterContextMinidump_x86_64.cpp in Sources */,
> 260CC64815D0440D002BF2E0 /* OptionValueArgs.cpp in Sources */,
> 260CC64915D0440D002BF2E0 /* OptionValueArray.cpp in Sources */,
> 260CC64A15D0440D002BF2E0 /* OptionValueBoolean.cpp in Sources */,
>
> Modified: lldb/trunk/source/Plugins/UnwindAssembly/x86/CMakeLists.txt
> URL: http://llvm.org/viewvc/llvm-project/lldb/trunk/source/Plugins/UnwindAssembly/x86/CMakeLists.txt?rev=282565&r1=282564&r2=282565&view=diff
> ==============================================================================
> --- lldb/trunk/source/Plugins/UnwindAssembly/x86/CMakeLists.txt (original)
> +++ lldb/trunk/source/Plugins/UnwindAssembly/x86/CMakeLists.txt Tue Sep 27 21:52:19 2016
> @@ -1,3 +1,4 @@
> add_lldb_library(lldbPluginUnwindAssemblyX86
> UnwindAssembly-x86.cpp
> + x86AssemblyInspectionEngine.cpp
> )
>
> Modified: lldb/trunk/source/Plugins/UnwindAssembly/x86/UnwindAssembly-x86.cpp
> URL: http://llvm.org/viewvc/llvm-project/lldb/trunk/source/Plugins/UnwindAssembly/x86/UnwindAssembly-x86.cpp?rev=282565&r1=282564&r2=282565&view=diff
> ==============================================================================
> --- lldb/trunk/source/Plugins/UnwindAssembly/x86/UnwindAssembly-x86.cpp (original)
> +++ lldb/trunk/source/Plugins/UnwindAssembly/x86/UnwindAssembly-x86.cpp Tue Sep 27 21:52:19 2016
> @@ -8,6 +8,7 @@
> //===----------------------------------------------------------------------===//
>
> #include "UnwindAssembly-x86.h"
> +#include "x86AssemblyInspectionEngine.h"
>
> #include "llvm-c/Disassembler.h"
> #include "llvm/ADT/STLExtras.h"
> @@ -30,1200 +31,39 @@
> using namespace lldb;
> using namespace lldb_private;
>
> -enum CPU { k_i386, k_x86_64 };
> -
> -enum i386_register_numbers {
> - k_machine_eax = 0,
> - k_machine_ecx = 1,
> - k_machine_edx = 2,
> - k_machine_ebx = 3,
> - k_machine_esp = 4,
> - k_machine_ebp = 5,
> - k_machine_esi = 6,
> - k_machine_edi = 7,
> - k_machine_eip = 8
> -};
> -
> -enum x86_64_register_numbers {
> - k_machine_rax = 0,
> - k_machine_rcx = 1,
> - k_machine_rdx = 2,
> - k_machine_rbx = 3,
> - k_machine_rsp = 4,
> - k_machine_rbp = 5,
> - k_machine_rsi = 6,
> - k_machine_rdi = 7,
> - k_machine_r8 = 8,
> - k_machine_r9 = 9,
> - k_machine_r10 = 10,
> - k_machine_r11 = 11,
> - k_machine_r12 = 12,
> - k_machine_r13 = 13,
> - k_machine_r14 = 14,
> - k_machine_r15 = 15,
> - k_machine_rip = 16
> -};
> -
> -struct regmap_ent {
> - const char *name;
> - int machine_regno;
> - int lldb_regno;
> -};
> -
> -static struct regmap_ent i386_register_map[] = {
> - {"eax", k_machine_eax, -1}, {"ecx", k_machine_ecx, -1},
> - {"edx", k_machine_edx, -1}, {"ebx", k_machine_ebx, -1},
> - {"esp", k_machine_esp, -1}, {"ebp", k_machine_ebp, -1},
> - {"esi", k_machine_esi, -1}, {"edi", k_machine_edi, -1},
> - {"eip", k_machine_eip, -1}};
> -
> -const int size_of_i386_register_map = llvm::array_lengthof(i386_register_map);
> -
> -static int i386_register_map_initialized = 0;
> -
> -static struct regmap_ent x86_64_register_map[] = {
> - {"rax", k_machine_rax, -1}, {"rcx", k_machine_rcx, -1},
> - {"rdx", k_machine_rdx, -1}, {"rbx", k_machine_rbx, -1},
> - {"rsp", k_machine_rsp, -1}, {"rbp", k_machine_rbp, -1},
> - {"rsi", k_machine_rsi, -1}, {"rdi", k_machine_rdi, -1},
> - {"r8", k_machine_r8, -1}, {"r9", k_machine_r9, -1},
> - {"r10", k_machine_r10, -1}, {"r11", k_machine_r11, -1},
> - {"r12", k_machine_r12, -1}, {"r13", k_machine_r13, -1},
> - {"r14", k_machine_r14, -1}, {"r15", k_machine_r15, -1},
> - {"rip", k_machine_rip, -1}};
> -
> -const int size_of_x86_64_register_map =
> - llvm::array_lengthof(x86_64_register_map);
> -
> -static int x86_64_register_map_initialized = 0;
> -
> //-----------------------------------------------------------------------------------------------
> -// AssemblyParse_x86 local-file class definition & implementation functions
> +// UnwindAssemblyParser_x86 method definitions
> //-----------------------------------------------------------------------------------------------
>
> -class AssemblyParse_x86 {
> -public:
> - AssemblyParse_x86(const ExecutionContext &exe_ctx, int cpu, ArchSpec &arch,
> - AddressRange func);
> -
> - ~AssemblyParse_x86();
> -
> - bool get_non_call_site_unwind_plan(UnwindPlan &unwind_plan);
> -
> - bool augment_unwind_plan_from_call_site(AddressRange &func,
> - UnwindPlan &unwind_plan);
> -
> - bool get_fast_unwind_plan(AddressRange &func, UnwindPlan &unwind_plan);
> -
> - bool find_first_non_prologue_insn(Address &address);
> -
> -private:
> - enum { kMaxInstructionByteSize = 32 };
> -
> - bool nonvolatile_reg_p(int machine_regno);
> - bool push_rbp_pattern_p();
> - bool push_0_pattern_p();
> - bool mov_rsp_rbp_pattern_p();
> - bool sub_rsp_pattern_p(int &amount);
> - bool add_rsp_pattern_p(int &amount);
> - bool lea_rsp_pattern_p(int &amount);
> - bool push_reg_p(int ®no);
> - bool pop_reg_p(int ®no);
> - bool push_imm_pattern_p();
> - bool mov_reg_to_local_stack_frame_p(int ®no, int &fp_offset);
> - bool ret_pattern_p();
> - bool pop_rbp_pattern_p();
> - bool leave_pattern_p();
> - bool call_next_insn_pattern_p();
> - uint32_t extract_4(uint8_t *b);
> - bool machine_regno_to_lldb_regno(int machine_regno, uint32_t &lldb_regno);
> - bool instruction_length(Address addr, int &length);
> -
> - const ExecutionContext m_exe_ctx;
> -
> - AddressRange m_func_bounds;
> -
> - Address m_cur_insn;
> - uint8_t m_cur_insn_bytes[kMaxInstructionByteSize];
> -
> - uint32_t m_machine_ip_regnum;
> - uint32_t m_machine_sp_regnum;
> - uint32_t m_machine_fp_regnum;
> -
> - uint32_t m_lldb_ip_regnum;
> - uint32_t m_lldb_sp_regnum;
> - uint32_t m_lldb_fp_regnum;
> -
> - int m_wordsize;
> - int m_cpu;
> - ArchSpec m_arch;
> - ::LLVMDisasmContextRef m_disasm_context;
> -
> - DISALLOW_COPY_AND_ASSIGN(AssemblyParse_x86);
> -};
> -
> -AssemblyParse_x86::AssemblyParse_x86(const ExecutionContext &exe_ctx, int cpu,
> - ArchSpec &arch, AddressRange func)
> - : m_exe_ctx(exe_ctx), m_func_bounds(func), m_cur_insn(),
> - m_machine_ip_regnum(LLDB_INVALID_REGNUM),
> - m_machine_sp_regnum(LLDB_INVALID_REGNUM),
> - m_machine_fp_regnum(LLDB_INVALID_REGNUM),
> - m_lldb_ip_regnum(LLDB_INVALID_REGNUM),
> - m_lldb_sp_regnum(LLDB_INVALID_REGNUM),
> - m_lldb_fp_regnum(LLDB_INVALID_REGNUM), m_wordsize(-1), m_cpu(cpu),
> - m_arch(arch) {
> - int *initialized_flag = NULL;
> - if (cpu == k_i386) {
> - m_machine_ip_regnum = k_machine_eip;
> - m_machine_sp_regnum = k_machine_esp;
> - m_machine_fp_regnum = k_machine_ebp;
> - m_wordsize = 4;
> - initialized_flag = &i386_register_map_initialized;
> - } else {
> - m_machine_ip_regnum = k_machine_rip;
> - m_machine_sp_regnum = k_machine_rsp;
> - m_machine_fp_regnum = k_machine_rbp;
> - m_wordsize = 8;
> - initialized_flag = &x86_64_register_map_initialized;
> - }
> -
> - // we only look at prologue - it will be complete earlier than 512 bytes into
> - // func
> - if (m_func_bounds.GetByteSize() == 0)
> - m_func_bounds.SetByteSize(512);
> -
> - Thread *thread = m_exe_ctx.GetThreadPtr();
> - if (thread && *initialized_flag == 0) {
> - RegisterContext *reg_ctx = thread->GetRegisterContext().get();
> - if (reg_ctx) {
> - struct regmap_ent *ent;
> - int count, i;
> - if (cpu == k_i386) {
> - ent = i386_register_map;
> - count = size_of_i386_register_map;
> - } else {
> - ent = x86_64_register_map;
> - count = size_of_x86_64_register_map;
> - }
> - for (i = 0; i < count; i++, ent++) {
> - const RegisterInfo *ri = reg_ctx->GetRegisterInfoByName(ent->name);
> - if (ri)
> - ent->lldb_regno = ri->kinds[eRegisterKindLLDB];
> - }
> - *initialized_flag = 1;
> - }
> - }
> -
> - // on initial construction we may not have a Thread so these have to remain
> - // uninitialized until we can get a RegisterContext to set up the register map
> - // table
> - if (*initialized_flag == 1) {
> - uint32_t lldb_regno;
> - if (machine_regno_to_lldb_regno(m_machine_sp_regnum, lldb_regno))
> - m_lldb_sp_regnum = lldb_regno;
> - if (machine_regno_to_lldb_regno(m_machine_fp_regnum, lldb_regno))
> - m_lldb_fp_regnum = lldb_regno;
> - if (machine_regno_to_lldb_regno(m_machine_ip_regnum, lldb_regno))
> - m_lldb_ip_regnum = lldb_regno;
> - }
> -
> - m_disasm_context =
> - ::LLVMCreateDisasm(m_arch.GetTriple().getTriple().c_str(), (void *)this,
> - /*TagType=*/1, NULL, NULL);
> -}
> -
> -AssemblyParse_x86::~AssemblyParse_x86() {
> - ::LLVMDisasmDispose(m_disasm_context);
> -}
> -
> -// This function expects an x86 native register number (i.e. the bits stripped
> -// out of the
> -// actual instruction), not an lldb register number.
> -
> -bool AssemblyParse_x86::nonvolatile_reg_p(int machine_regno) {
> - if (m_cpu == k_i386) {
> - switch (machine_regno) {
> - case k_machine_ebx:
> - case k_machine_ebp: // not actually a nonvolatile but often treated as such
> - // by convention
> - case k_machine_esi:
> - case k_machine_edi:
> - case k_machine_esp:
> - return true;
> - default:
> - return false;
> - }
> - }
> - if (m_cpu == k_x86_64) {
> - switch (machine_regno) {
> - case k_machine_rbx:
> - case k_machine_rsp:
> - case k_machine_rbp: // not actually a nonvolatile but often treated as such
> - // by convention
> - case k_machine_r12:
> - case k_machine_r13:
> - case k_machine_r14:
> - case k_machine_r15:
> - return true;
> - default:
> - return false;
> - }
> - }
> - return false;
> -}
> -
> -// Macro to detect if this is a REX mode prefix byte.
> -#define REX_W_PREFIX_P(opcode) (((opcode) & (~0x5)) == 0x48)
> -
> -// The high bit which should be added to the source register number (the "R"
> -// bit)
> -#define REX_W_SRCREG(opcode) (((opcode)&0x4) >> 2)
> -
> -// The high bit which should be added to the destination register number (the
> -// "B" bit)
> -#define REX_W_DSTREG(opcode) ((opcode)&0x1)
> -
> -// pushq %rbp [0x55]
> -bool AssemblyParse_x86::push_rbp_pattern_p() {
> - uint8_t *p = m_cur_insn_bytes;
> - if (*p == 0x55)
> - return true;
> - return false;
> -}
> -
> -// pushq $0 ; the first instruction in start() [0x6a 0x00]
> -bool AssemblyParse_x86::push_0_pattern_p() {
> - uint8_t *p = m_cur_insn_bytes;
> - if (*p == 0x6a && *(p + 1) == 0x0)
> - return true;
> - return false;
> -}
> -
> -// pushq $0
> -// pushl $0
> -bool AssemblyParse_x86::push_imm_pattern_p() {
> - uint8_t *p = m_cur_insn_bytes;
> - if (*p == 0x68 || *p == 0x6a)
> - return true;
> - return false;
> -}
> -
> -// movq %rsp, %rbp [0x48 0x8b 0xec] or [0x48 0x89 0xe5]
> -// movl %esp, %ebp [0x8b 0xec] or [0x89 0xe5]
> -bool AssemblyParse_x86::mov_rsp_rbp_pattern_p() {
> - uint8_t *p = m_cur_insn_bytes;
> - if (m_wordsize == 8 && *p == 0x48)
> - p++;
> - if (*(p) == 0x8b && *(p + 1) == 0xec)
> - return true;
> - if (*(p) == 0x89 && *(p + 1) == 0xe5)
> - return true;
> - return false;
> -}
> +UnwindAssembly_x86::UnwindAssembly_x86(const ArchSpec &arch)
> + : lldb_private::UnwindAssembly(arch),
> + m_assembly_inspection_engine(new x86AssemblyInspectionEngine(arch)) {}
>
> -// subq $0x20, %rsp
> -bool AssemblyParse_x86::sub_rsp_pattern_p(int &amount) {
> - uint8_t *p = m_cur_insn_bytes;
> - if (m_wordsize == 8 && *p == 0x48)
> - p++;
> - // 8-bit immediate operand
> - if (*p == 0x83 && *(p + 1) == 0xec) {
> - amount = (int8_t) * (p + 2);
> - return true;
> - }
> - // 32-bit immediate operand
> - if (*p == 0x81 && *(p + 1) == 0xec) {
> - amount = (int32_t)extract_4(p + 2);
> - return true;
> - }
> - return false;
> -}
> -
> -// addq $0x20, %rsp
> -bool AssemblyParse_x86::add_rsp_pattern_p(int &amount) {
> - uint8_t *p = m_cur_insn_bytes;
> - if (m_wordsize == 8 && *p == 0x48)
> - p++;
> - // 8-bit immediate operand
> - if (*p == 0x83 && *(p + 1) == 0xc4) {
> - amount = (int8_t) * (p + 2);
> - return true;
> - }
> - // 32-bit immediate operand
> - if (*p == 0x81 && *(p + 1) == 0xc4) {
> - amount = (int32_t)extract_4(p + 2);
> - return true;
> - }
> - return false;
> -}
> -
> -// lea esp, [esp - 0x28]
> -// lea esp, [esp + 0x28]
> -bool AssemblyParse_x86::lea_rsp_pattern_p(int &amount) {
> - uint8_t *p = m_cur_insn_bytes;
> - if (m_wordsize == 8 && *p == 0x48)
> - p++;
> -
> - // Check opcode
> - if (*p != 0x8d)
> - return false;
> -
> - // 8 bit displacement
> - if (*(p + 1) == 0x64 && (*(p + 2) & 0x3f) == 0x24) {
> - amount = (int8_t) * (p + 3);
> - return true;
> - }
> -
> - // 32 bit displacement
> - if (*(p + 1) == 0xa4 && (*(p + 2) & 0x3f) == 0x24) {
> - amount = (int32_t)extract_4(p + 3);
> - return true;
> - }
> -
> - return false;
> -}
> -
> -// pushq %rbx
> -// pushl %ebx
> -bool AssemblyParse_x86::push_reg_p(int ®no) {
> - uint8_t *p = m_cur_insn_bytes;
> - int regno_prefix_bit = 0;
> - // If we have a rex prefix byte, check to see if a B bit is set
> - if (m_wordsize == 8 && *p == 0x41) {
> - regno_prefix_bit = 1 << 3;
> - p++;
> - }
> - if (*p >= 0x50 && *p <= 0x57) {
> - regno = (*p - 0x50) | regno_prefix_bit;
> - return true;
> - }
> - return false;
> +UnwindAssembly_x86::~UnwindAssembly_x86() {
> + delete m_assembly_inspection_engine;
> }
>
> -// popq %rbx
> -// popl %ebx
> -bool AssemblyParse_x86::pop_reg_p(int ®no) {
> - uint8_t *p = m_cur_insn_bytes;
> - int regno_prefix_bit = 0;
> - // If we have a rex prefix byte, check to see if a B bit is set
> - if (m_wordsize == 8 && *p == 0x41) {
> - regno_prefix_bit = 1 << 3;
> - p++;
> - }
> - if (*p >= 0x58 && *p <= 0x5f) {
> - regno = (*p - 0x58) | regno_prefix_bit;
> - return true;
> - }
> - return false;
> -}
> -
> -// popq %rbp [0x5d]
> -// popl %ebp [0x5d]
> -bool AssemblyParse_x86::pop_rbp_pattern_p() {
> - uint8_t *p = m_cur_insn_bytes;
> - return (*p == 0x5d);
> -}
> -
> -// leave [0xc9]
> -bool AssemblyParse_x86::leave_pattern_p() {
> - uint8_t *p = m_cur_insn_bytes;
> - return (*p == 0xc9);
> -}
> -
> -// call $0 [0xe8 0x0 0x0 0x0 0x0]
> -bool AssemblyParse_x86::call_next_insn_pattern_p() {
> - uint8_t *p = m_cur_insn_bytes;
> - return (*p == 0xe8) && (*(p + 1) == 0x0) && (*(p + 2) == 0x0) &&
> - (*(p + 3) == 0x0) && (*(p + 4) == 0x0);
> -}
> -
> -// Look for an instruction sequence storing a nonvolatile register
> -// on to the stack frame.
> -
> -// movq %rax, -0x10(%rbp) [0x48 0x89 0x45 0xf0]
> -// movl %eax, -0xc(%ebp) [0x89 0x45 0xf4]
> -
> -// The offset value returned in rbp_offset will be positive --
> -// but it must be subtraced from the frame base register to get
> -// the actual location. The positive value returned for the offset
> -// is a convention used elsewhere for CFA offsets et al.
> -
> -bool AssemblyParse_x86::mov_reg_to_local_stack_frame_p(int ®no,
> - int &rbp_offset) {
> - uint8_t *p = m_cur_insn_bytes;
> - int src_reg_prefix_bit = 0;
> - int target_reg_prefix_bit = 0;
> -
> - if (m_wordsize == 8 && REX_W_PREFIX_P(*p)) {
> - src_reg_prefix_bit = REX_W_SRCREG(*p) << 3;
> - target_reg_prefix_bit = REX_W_DSTREG(*p) << 3;
> - if (target_reg_prefix_bit == 1) {
> - // rbp/ebp don't need a prefix bit - we know this isn't the
> - // reg we care about.
> - return false;
> - }
> - p++;
> - }
> -
> - if (*p == 0x89) {
> - /* Mask off the 3-5 bits which indicate the destination register
> - if this is a ModR/M byte. */
> - int opcode_destreg_masked_out = *(p + 1) & (~0x38);
> -
> - /* Is this a ModR/M byte with Mod bits 01 and R/M bits 101
> - and three bits between them, e.g. 01nnn101
> - We're looking for a destination of ebp-disp8 or ebp-disp32. */
> - int immsize;
> - if (opcode_destreg_masked_out == 0x45)
> - immsize = 2;
> - else if (opcode_destreg_masked_out == 0x85)
> - immsize = 4;
> - else
> - return false;
> -
> - int offset = 0;
> - if (immsize == 2)
> - offset = (int8_t) * (p + 2);
> - if (immsize == 4)
> - offset = (uint32_t)extract_4(p + 2);
> - if (offset > 0)
> - return false;
> -
> - regno = ((*(p + 1) >> 3) & 0x7) | src_reg_prefix_bit;
> - rbp_offset = offset > 0 ? offset : -offset;
> - return true;
> - }
> - return false;
> -}
> -
> -// ret [0xc9] or [0xc2 imm8] or [0xca imm8]
> -bool AssemblyParse_x86::ret_pattern_p() {
> - uint8_t *p = m_cur_insn_bytes;
> - if (*p == 0xc9 || *p == 0xc2 || *p == 0xca || *p == 0xc3)
> - return true;
> - return false;
> -}
> -
> -uint32_t AssemblyParse_x86::extract_4(uint8_t *b) {
> - uint32_t v = 0;
> - for (int i = 3; i >= 0; i--)
> - v = (v << 8) | b[i];
> - return v;
> -}
> -
> -bool AssemblyParse_x86::machine_regno_to_lldb_regno(int machine_regno,
> - uint32_t &lldb_regno) {
> - struct regmap_ent *ent;
> - int count, i;
> - if (m_cpu == k_i386) {
> - ent = i386_register_map;
> - count = size_of_i386_register_map;
> - } else {
> - ent = x86_64_register_map;
> - count = size_of_x86_64_register_map;
> - }
> - for (i = 0; i < count; i++, ent++) {
> - if (ent->machine_regno == machine_regno)
> - if (ent->lldb_regno != -1) {
> - lldb_regno = ent->lldb_regno;
> - return true;
> - }
> - }
> - return false;
> -}
> -
> -bool AssemblyParse_x86::instruction_length(Address addr, int &length) {
> - const uint32_t max_op_byte_size = m_arch.GetMaximumOpcodeByteSize();
> - llvm::SmallVector<uint8_t, 32> opcode_data;
> - opcode_data.resize(max_op_byte_size);
> -
> - if (!addr.IsValid())
> +bool UnwindAssembly_x86::GetNonCallSiteUnwindPlanFromAssembly(
> + AddressRange &func, Thread &thread, UnwindPlan &unwind_plan) {
> + if (!func.GetBaseAddress().IsValid() || func.GetByteSize() == 0)
> return false;
> -
> - const bool prefer_file_cache = true;
> - Error error;
> - Target *target = m_exe_ctx.GetTargetPtr();
> - if (target->ReadMemory(addr, prefer_file_cache, opcode_data.data(),
> - max_op_byte_size, error) == static_cast<size_t>(-1)) {
> + if (m_assembly_inspection_engine == nullptr)
> return false;
> - }
> -
> - char out_string[512];
> - const addr_t pc = addr.GetFileAddress();
> - const size_t inst_size = ::LLVMDisasmInstruction(
> - m_disasm_context, opcode_data.data(), max_op_byte_size,
> - pc, // PC value
> - out_string, sizeof(out_string));
> -
> - length = inst_size;
> - return true;
> -}
> -
> -bool AssemblyParse_x86::get_non_call_site_unwind_plan(UnwindPlan &unwind_plan) {
> - UnwindPlan::RowSP row(new UnwindPlan::Row);
> - m_cur_insn = m_func_bounds.GetBaseAddress();
> - addr_t current_func_text_offset = 0;
> - int current_sp_bytes_offset_from_cfa = 0;
> - UnwindPlan::Row::RegisterLocation initial_regloc;
> - Error error;
> -
> - if (!m_cur_insn.IsValid()) {
> + ProcessSP process_sp(thread.GetProcess());
> + if (process_sp.get() == nullptr)
> return false;
> - }
> -
> - unwind_plan.SetPlanValidAddressRange(m_func_bounds);
> - unwind_plan.SetRegisterKind(eRegisterKindLLDB);
> -
> - // At the start of the function, find the CFA by adding wordsize to the SP
> - // register
> - row->SetOffset(current_func_text_offset);
> - row->GetCFAValue().SetIsRegisterPlusOffset(m_lldb_sp_regnum, m_wordsize);
> -
> - // caller's stack pointer value before the call insn is the CFA address
> - initial_regloc.SetIsCFAPlusOffset(0);
> - row->SetRegisterInfo(m_lldb_sp_regnum, initial_regloc);
> -
> - // saved instruction pointer can be found at CFA - wordsize.
> - current_sp_bytes_offset_from_cfa = m_wordsize;
> - initial_regloc.SetAtCFAPlusOffset(-current_sp_bytes_offset_from_cfa);
> - row->SetRegisterInfo(m_lldb_ip_regnum, initial_regloc);
> -
> - unwind_plan.AppendRow(row);
> -
> - // Allocate a new Row, populate it with the existing Row contents.
> - UnwindPlan::Row *newrow = new UnwindPlan::Row;
> - *newrow = *row.get();
> - row.reset(newrow);
> -
> - // Track which registers have been saved so far in the prologue.
> - // If we see another push of that register, it's not part of the prologue.
> - // The register numbers used here are the machine register #'s
> - // (i386_register_numbers, x86_64_register_numbers).
> - std::vector<bool> saved_registers(32, false);
> -
> const bool prefer_file_cache = true;
> -
> - // Once the prologue has completed we'll save a copy of the unwind
> - // instructions
> - // If there is an epilogue in the middle of the function, after that epilogue
> - // we'll reinstate
> - // the unwind setup -- we assume that some code path jumps over the
> - // mid-function epilogue
> -
> - UnwindPlan::RowSP prologue_completed_row; // copy of prologue row of CFI
> - int prologue_completed_sp_bytes_offset_from_cfa; // The sp value before the
> - // epilogue started executed
> - std::vector<bool> prologue_completed_saved_registers;
> -
> - Target *target = m_exe_ctx.GetTargetPtr();
> - while (m_func_bounds.ContainsFileAddress(m_cur_insn)) {
> - int stack_offset, insn_len;
> - int machine_regno; // register numbers masked directly out of instructions
> - uint32_t lldb_regno; // register numbers in lldb's eRegisterKindLLDB
> - // numbering scheme
> -
> - bool in_epilogue = false; // we're in the middle of an epilogue sequence
> - bool row_updated = false; // The UnwindPlan::Row 'row' has been updated
> -
> - if (!instruction_length(m_cur_insn, insn_len) || insn_len == 0 ||
> - insn_len > kMaxInstructionByteSize) {
> - // An unrecognized/junk instruction
> - break;
> - }
> -
> - if (target->ReadMemory(m_cur_insn, prefer_file_cache, m_cur_insn_bytes,
> - insn_len, error) == static_cast<size_t>(-1)) {
> - // Error reading the instruction out of the file, stop scanning
> - break;
> - }
> -
> - if (push_rbp_pattern_p()) {
> - current_sp_bytes_offset_from_cfa += m_wordsize;
> - row->GetCFAValue().SetOffset(current_sp_bytes_offset_from_cfa);
> - UnwindPlan::Row::RegisterLocation regloc;
> - regloc.SetAtCFAPlusOffset(-row->GetCFAValue().GetOffset());
> - row->SetRegisterInfo(m_lldb_fp_regnum, regloc);
> - saved_registers[m_machine_fp_regnum] = true;
> - row_updated = true;
> - }
> -
> - else if (mov_rsp_rbp_pattern_p()) {
> - row->GetCFAValue().SetIsRegisterPlusOffset(
> - m_lldb_fp_regnum, row->GetCFAValue().GetOffset());
> - row_updated = true;
> - }
> -
> - // This is the start() function (or a pthread equivalent), it starts with a
> - // pushl $0x0 which puts the
> - // saved pc value of 0 on the stack. In this case we want to pretend we
> - // didn't see a stack movement at all --
> - // normally the saved pc value is already on the stack by the time the
> - // function starts executing.
> - else if (push_0_pattern_p()) {
> - }
> -
> - else if (push_reg_p(machine_regno)) {
> - current_sp_bytes_offset_from_cfa += m_wordsize;
> - // the PUSH instruction has moved the stack pointer - if the CFA is set in
> - // terms of the stack pointer,
> - // we need to add a new row of instructions.
> - if (row->GetCFAValue().GetRegisterNumber() == m_lldb_sp_regnum) {
> - row->GetCFAValue().SetOffset(current_sp_bytes_offset_from_cfa);
> - row_updated = true;
> - }
> - // record where non-volatile (callee-saved, spilled) registers are saved
> - // on the stack
> - if (nonvolatile_reg_p(machine_regno) &&
> - machine_regno_to_lldb_regno(machine_regno, lldb_regno) &&
> - saved_registers[machine_regno] == false) {
> - UnwindPlan::Row::RegisterLocation regloc;
> - regloc.SetAtCFAPlusOffset(-current_sp_bytes_offset_from_cfa);
> - row->SetRegisterInfo(lldb_regno, regloc);
> - saved_registers[machine_regno] = true;
> - row_updated = true;
> - }
> - }
> -
> - else if (pop_reg_p(machine_regno)) {
> - current_sp_bytes_offset_from_cfa -= m_wordsize;
> -
> - if (nonvolatile_reg_p(machine_regno) &&
> - machine_regno_to_lldb_regno(machine_regno, lldb_regno) &&
> - saved_registers[machine_regno] == true) {
> - saved_registers[machine_regno] = false;
> - row->RemoveRegisterInfo(lldb_regno);
> -
> - if (machine_regno == (int)m_machine_fp_regnum) {
> - row->GetCFAValue().SetIsRegisterPlusOffset(
> - m_lldb_sp_regnum, row->GetCFAValue().GetOffset());
> - }
> -
> - in_epilogue = true;
> - row_updated = true;
> - }
> -
> - // the POP instruction has moved the stack pointer - if the CFA is set in
> - // terms of the stack pointer,
> - // we need to add a new row of instructions.
> - if (row->GetCFAValue().GetRegisterNumber() == m_lldb_sp_regnum) {
> - row->GetCFAValue().SetIsRegisterPlusOffset(
> - m_lldb_sp_regnum, current_sp_bytes_offset_from_cfa);
> - row_updated = true;
> - }
> - }
> -
> - // The LEAVE instruction moves the value from rbp into rsp and pops
> - // a value off the stack into rbp (restoring the caller's rbp value).
> - // It is the opposite of ENTER, or 'push rbp, mov rsp rbp'.
> - else if (leave_pattern_p()) {
> - // We're going to copy the value in rbp into rsp, so re-set the sp offset
> - // based on the CFAValue. Also, adjust it to recognize that we're popping
> - // the saved rbp value off the stack.
> - current_sp_bytes_offset_from_cfa = row->GetCFAValue().GetOffset();
> - current_sp_bytes_offset_from_cfa -= m_wordsize;
> - row->GetCFAValue().SetOffset(current_sp_bytes_offset_from_cfa);
> -
> - // rbp is restored to the caller's value
> - saved_registers[m_machine_fp_regnum] = false;
> - row->RemoveRegisterInfo(m_lldb_fp_regnum);
> -
> - // cfa is now in terms of rsp again.
> - row->GetCFAValue().SetIsRegisterPlusOffset(
> - m_lldb_sp_regnum, row->GetCFAValue().GetOffset());
> - row->GetCFAValue().SetOffset(current_sp_bytes_offset_from_cfa);
> -
> - in_epilogue = true;
> - row_updated = true;
> - }
> -
> - else if (mov_reg_to_local_stack_frame_p(machine_regno, stack_offset) &&
> - nonvolatile_reg_p(machine_regno) &&
> - machine_regno_to_lldb_regno(machine_regno, lldb_regno) &&
> - saved_registers[machine_regno] == false) {
> - saved_registers[machine_regno] = true;
> -
> - UnwindPlan::Row::RegisterLocation regloc;
> -
> - // stack_offset for 'movq %r15, -80(%rbp)' will be 80.
> - // In the Row, we want to express this as the offset from the CFA. If the
> - // frame base
> - // is rbp (like the above instruction), the CFA offset for rbp is probably
> - // 16. So we
> - // want to say that the value is stored at the CFA address - 96.
> - regloc.SetAtCFAPlusOffset(
> - -(stack_offset + row->GetCFAValue().GetOffset()));
> -
> - row->SetRegisterInfo(lldb_regno, regloc);
> -
> - row_updated = true;
> - }
> -
> - else if (sub_rsp_pattern_p(stack_offset)) {
> - current_sp_bytes_offset_from_cfa += stack_offset;
> - if (row->GetCFAValue().GetRegisterNumber() == m_lldb_sp_regnum) {
> - row->GetCFAValue().SetOffset(current_sp_bytes_offset_from_cfa);
> - row_updated = true;
> - }
> - }
> -
> - else if (add_rsp_pattern_p(stack_offset)) {
> - current_sp_bytes_offset_from_cfa -= stack_offset;
> - if (row->GetCFAValue().GetRegisterNumber() == m_lldb_sp_regnum) {
> - row->GetCFAValue().SetOffset(current_sp_bytes_offset_from_cfa);
> - row_updated = true;
> - }
> - in_epilogue = true;
> - }
> -
> - else if (lea_rsp_pattern_p(stack_offset)) {
> - current_sp_bytes_offset_from_cfa -= stack_offset;
> - if (row->GetCFAValue().GetRegisterNumber() == m_lldb_sp_regnum) {
> - row->GetCFAValue().SetOffset(current_sp_bytes_offset_from_cfa);
> - row_updated = true;
> - }
> - if (stack_offset > 0)
> - in_epilogue = true;
> - }
> -
> - else if (ret_pattern_p() && prologue_completed_row.get()) {
> - // Reinstate the saved prologue setup for any instructions
> - // that come after the ret instruction
> -
> - UnwindPlan::Row *newrow = new UnwindPlan::Row;
> - *newrow = *prologue_completed_row.get();
> - row.reset(newrow);
> - current_sp_bytes_offset_from_cfa =
> - prologue_completed_sp_bytes_offset_from_cfa;
> -
> - saved_registers.clear();
> - saved_registers.resize(prologue_completed_saved_registers.size(), false);
> - for (size_t i = 0; i < prologue_completed_saved_registers.size(); ++i) {
> - saved_registers[i] = prologue_completed_saved_registers[i];
> - }
> -
> - in_epilogue = true;
> - row_updated = true;
> - }
> -
> - // call next instruction
> - // call 0
> - // => pop %ebx
> - // This is used in i386 programs to get the PIC base address for finding
> - // global data
> - else if (call_next_insn_pattern_p()) {
> - current_sp_bytes_offset_from_cfa += m_wordsize;
> - if (row->GetCFAValue().GetRegisterNumber() == m_lldb_sp_regnum) {
> - row->GetCFAValue().SetOffset(current_sp_bytes_offset_from_cfa);
> - row_updated = true;
> - }
> - }
> -
> - if (row_updated) {
> - if (current_func_text_offset + insn_len < m_func_bounds.GetByteSize()) {
> - row->SetOffset(current_func_text_offset + insn_len);
> - unwind_plan.AppendRow(row);
> - // Allocate a new Row, populate it with the existing Row contents.
> - newrow = new UnwindPlan::Row;
> - *newrow = *row.get();
> - row.reset(newrow);
> - }
> - }
> -
> - if (in_epilogue == false && row_updated) {
> - // If we're not in an epilogue sequence, save the updated Row
> - UnwindPlan::Row *newrow = new UnwindPlan::Row;
> - *newrow = *row.get();
> - prologue_completed_row.reset(newrow);
> -
> - prologue_completed_saved_registers.clear();
> - prologue_completed_saved_registers.resize(saved_registers.size(), false);
> - for (size_t i = 0; i < saved_registers.size(); ++i) {
> - prologue_completed_saved_registers[i] = saved_registers[i];
> - }
> - }
> -
> - // We may change the sp value without adding a new Row necessarily -- keep
> - // track of it either way.
> - if (in_epilogue == false) {
> - prologue_completed_sp_bytes_offset_from_cfa =
> - current_sp_bytes_offset_from_cfa;
> - }
> -
> - m_cur_insn.SetOffset(m_cur_insn.GetOffset() + insn_len);
> - current_func_text_offset += insn_len;
> - }
> -
> - unwind_plan.SetSourceName("assembly insn profiling");
> - unwind_plan.SetSourcedFromCompiler(eLazyBoolNo);
> - unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolYes);
> -
> - return true;
> -}
> -
> -bool AssemblyParse_x86::augment_unwind_plan_from_call_site(
> - AddressRange &func, UnwindPlan &unwind_plan) {
> - // Is func address valid?
> - Address addr_start = func.GetBaseAddress();
> - if (!addr_start.IsValid())
> - return false;
> -
> - // Is original unwind_plan valid?
> - // unwind_plan should have at least one row which is ABI-default (CFA register
> - // is sp),
> - // and another row in mid-function.
> - if (unwind_plan.GetRowCount() < 2)
> - return false;
> - UnwindPlan::RowSP first_row = unwind_plan.GetRowAtIndex(0);
> - if (first_row->GetOffset() != 0)
> - return false;
> - uint32_t cfa_reg = m_exe_ctx.GetThreadPtr()
> - ->GetRegisterContext()
> - ->ConvertRegisterKindToRegisterNumber(
> - unwind_plan.GetRegisterKind(),
> - first_row->GetCFAValue().GetRegisterNumber());
> - if (cfa_reg != m_lldb_sp_regnum ||
> - first_row->GetCFAValue().GetOffset() != m_wordsize)
> - return false;
> -
> - UnwindPlan::RowSP original_last_row = unwind_plan.GetRowForFunctionOffset(-1);
> -
> - Target *target = m_exe_ctx.GetTargetPtr();
> - m_cur_insn = func.GetBaseAddress();
> - uint64_t offset = 0;
> - int row_id = 1;
> - bool unwind_plan_updated = false;
> - UnwindPlan::RowSP row(new UnwindPlan::Row(*first_row));
> -
> - // After a mid-function epilogue we will need to re-insert the original unwind
> - // rules
> - // so unwinds work for the remainder of the function. These aren't common
> - // with clang/gcc
> - // on x86 but it is possible.
> - bool reinstate_unwind_state = false;
> -
> - while (func.ContainsFileAddress(m_cur_insn)) {
> - int insn_len;
> - if (!instruction_length(m_cur_insn, insn_len) || insn_len == 0 ||
> - insn_len > kMaxInstructionByteSize) {
> - // An unrecognized/junk instruction.
> - break;
> - }
> - const bool prefer_file_cache = true;
> - Error error;
> - if (target->ReadMemory(m_cur_insn, prefer_file_cache, m_cur_insn_bytes,
> - insn_len, error) == static_cast<size_t>(-1)) {
> - // Error reading the instruction out of the file, stop scanning.
> - break;
> - }
> -
> - // Advance offsets.
> - offset += insn_len;
> - m_cur_insn.SetOffset(m_cur_insn.GetOffset() + insn_len);
> -
> - if (reinstate_unwind_state) {
> - // that was the last instruction of this function
> - if (func.ContainsFileAddress(m_cur_insn) == false)
> - continue;
> -
> - UnwindPlan::RowSP new_row(new UnwindPlan::Row());
> - *new_row = *original_last_row;
> - new_row->SetOffset(offset);
> - unwind_plan.AppendRow(new_row);
> - row.reset(new UnwindPlan::Row());
> - *row = *new_row;
> - reinstate_unwind_state = false;
> - unwind_plan_updated = true;
> - continue;
> - }
> -
> - // If we already have one row for this instruction, we can continue.
> - while (row_id < unwind_plan.GetRowCount() &&
> - unwind_plan.GetRowAtIndex(row_id)->GetOffset() <= offset) {
> - row_id++;
> - }
> - UnwindPlan::RowSP original_row = unwind_plan.GetRowAtIndex(row_id - 1);
> - if (original_row->GetOffset() == offset) {
> - *row = *original_row;
> - continue;
> - }
> -
> - if (row_id == 0) {
> - // If we are here, compiler didn't generate CFI for prologue.
> - // This won't happen to GCC or clang.
> - // In this case, bail out directly.
> - return false;
> - }
> -
> - // Inspect the instruction to check if we need a new row for it.
> - cfa_reg = m_exe_ctx.GetThreadPtr()
> - ->GetRegisterContext()
> - ->ConvertRegisterKindToRegisterNumber(
> - unwind_plan.GetRegisterKind(),
> - row->GetCFAValue().GetRegisterNumber());
> - if (cfa_reg == m_lldb_sp_regnum) {
> - // CFA register is sp.
> -
> - // call next instruction
> - // call 0
> - // => pop %ebx
> - if (call_next_insn_pattern_p()) {
> - row->SetOffset(offset);
> - row->GetCFAValue().IncOffset(m_wordsize);
> -
> - UnwindPlan::RowSP new_row(new UnwindPlan::Row(*row));
> - unwind_plan.InsertRow(new_row);
> - unwind_plan_updated = true;
> - continue;
> - }
> -
> - // push/pop register
> - int regno;
> - if (push_reg_p(regno)) {
> - row->SetOffset(offset);
> - row->GetCFAValue().IncOffset(m_wordsize);
> -
> - UnwindPlan::RowSP new_row(new UnwindPlan::Row(*row));
> - unwind_plan.InsertRow(new_row);
> - unwind_plan_updated = true;
> - continue;
> - }
> - if (pop_reg_p(regno)) {
> - // Technically, this might be a nonvolatile register recover in
> - // epilogue.
> - // We should reset RegisterInfo for the register.
> - // But in practice, previous rule for the register is still valid...
> - // So we ignore this case.
> -
> - row->SetOffset(offset);
> - row->GetCFAValue().IncOffset(-m_wordsize);
> -
> - UnwindPlan::RowSP new_row(new UnwindPlan::Row(*row));
> - unwind_plan.InsertRow(new_row);
> - unwind_plan_updated = true;
> - continue;
> - }
> -
> - // push imm
> - if (push_imm_pattern_p()) {
> - row->SetOffset(offset);
> - row->GetCFAValue().IncOffset(m_wordsize);
> - UnwindPlan::RowSP new_row(new UnwindPlan::Row(*row));
> - unwind_plan.InsertRow(new_row);
> - unwind_plan_updated = true;
> - continue;
> - }
> -
> - // add/sub %rsp/%esp
> - int amount;
> - if (add_rsp_pattern_p(amount)) {
> - row->SetOffset(offset);
> - row->GetCFAValue().IncOffset(-amount);
> -
> - UnwindPlan::RowSP new_row(new UnwindPlan::Row(*row));
> - unwind_plan.InsertRow(new_row);
> - unwind_plan_updated = true;
> - continue;
> - }
> - if (sub_rsp_pattern_p(amount)) {
> - row->SetOffset(offset);
> - row->GetCFAValue().IncOffset(amount);
> -
> - UnwindPlan::RowSP new_row(new UnwindPlan::Row(*row));
> - unwind_plan.InsertRow(new_row);
> - unwind_plan_updated = true;
> - continue;
> - }
> -
> - // lea %rsp, [%rsp + $offset]
> - if (lea_rsp_pattern_p(amount)) {
> - row->SetOffset(offset);
> - row->GetCFAValue().IncOffset(-amount);
> -
> - UnwindPlan::RowSP new_row(new UnwindPlan::Row(*row));
> - unwind_plan.InsertRow(new_row);
> - unwind_plan_updated = true;
> - continue;
> - }
> -
> - if (ret_pattern_p()) {
> - reinstate_unwind_state = true;
> - continue;
> - }
> - } else if (cfa_reg == m_lldb_fp_regnum) {
> - // CFA register is fp.
> -
> - // The only case we care about is epilogue:
> - // [0x5d] pop %rbp/%ebp
> - // => [0xc3] ret
> - if (pop_rbp_pattern_p() || leave_pattern_p()) {
> - if (target->ReadMemory(m_cur_insn, prefer_file_cache, m_cur_insn_bytes,
> - 1, error) != static_cast<size_t>(-1) &&
> - ret_pattern_p()) {
> - row->SetOffset(offset);
> - row->GetCFAValue().SetIsRegisterPlusOffset(
> - first_row->GetCFAValue().GetRegisterNumber(), m_wordsize);
> -
> - UnwindPlan::RowSP new_row(new UnwindPlan::Row(*row));
> - unwind_plan.InsertRow(new_row);
> - unwind_plan_updated = true;
> - reinstate_unwind_state = true;
> - continue;
> - }
> - }
> - } else {
> - // CFA register is not sp or fp.
> -
> - // This must be hand-written assembly.
> - // Just trust eh_frame and assume we have finished.
> - break;
> - }
> - }
> -
> - unwind_plan.SetPlanValidAddressRange(func);
> - if (unwind_plan_updated) {
> - std::string unwind_plan_source(unwind_plan.GetSourceName().AsCString());
> - unwind_plan_source += " plus augmentation from assembly parsing";
> - unwind_plan.SetSourceName(unwind_plan_source.c_str());
> - unwind_plan.SetSourcedFromCompiler(eLazyBoolNo);
> - unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolYes);
> - }
> - return true;
> -}
> -
> -/* The "fast unwind plan" is valid for functions that follow the usual
> - convention of
> - using the frame pointer register (ebp, rbp), i.e. the function prologue looks
> - like
> - push %rbp [0x55]
> - mov %rsp,%rbp [0x48 0x89 0xe5] (this is a 2-byte insn seq on i386)
> -*/
> -
> -bool AssemblyParse_x86::get_fast_unwind_plan(AddressRange &func,
> - UnwindPlan &unwind_plan) {
> - UnwindPlan::RowSP row(new UnwindPlan::Row);
> - UnwindPlan::Row::RegisterLocation pc_reginfo;
> - UnwindPlan::Row::RegisterLocation sp_reginfo;
> - UnwindPlan::Row::RegisterLocation fp_reginfo;
> - unwind_plan.SetRegisterKind(eRegisterKindLLDB);
> -
> - if (!func.GetBaseAddress().IsValid())
> - return false;
> -
> - Target *target = m_exe_ctx.GetTargetPtr();
> -
> - uint8_t bytebuf[4];
> + std::vector<uint8_t> function_text(func.GetByteSize());
> Error error;
> - const bool prefer_file_cache = true;
> - if (target->ReadMemory(func.GetBaseAddress(), prefer_file_cache, bytebuf,
> - sizeof(bytebuf), error) == static_cast<size_t>(-1))
> - return false;
> -
> - uint8_t i386_prologue[] = {0x55, 0x89, 0xe5};
> - uint8_t x86_64_prologue[] = {0x55, 0x48, 0x89, 0xe5};
> - int prologue_size;
> -
> - if (memcmp(bytebuf, i386_prologue, sizeof(i386_prologue)) == 0) {
> - prologue_size = sizeof(i386_prologue);
> - } else if (memcmp(bytebuf, x86_64_prologue, sizeof(x86_64_prologue)) == 0) {
> - prologue_size = sizeof(x86_64_prologue);
> - } else {
> - return false;
> - }
> -
> - pc_reginfo.SetAtCFAPlusOffset(-m_wordsize);
> - row->SetRegisterInfo(m_lldb_ip_regnum, pc_reginfo);
> -
> - sp_reginfo.SetIsCFAPlusOffset(0);
> - row->SetRegisterInfo(m_lldb_sp_regnum, sp_reginfo);
> -
> - // Zero instructions into the function
> - row->GetCFAValue().SetIsRegisterPlusOffset(m_lldb_sp_regnum, m_wordsize);
> - row->SetOffset(0);
> - unwind_plan.AppendRow(row);
> - UnwindPlan::Row *newrow = new UnwindPlan::Row;
> - *newrow = *row.get();
> - row.reset(newrow);
> -
> - // push %rbp has executed - stack moved, rbp now saved
> - row->GetCFAValue().IncOffset(m_wordsize);
> - fp_reginfo.SetAtCFAPlusOffset(2 * -m_wordsize);
> - row->SetRegisterInfo(m_lldb_fp_regnum, fp_reginfo);
> - row->SetOffset(1);
> - unwind_plan.AppendRow(row);
> -
> - newrow = new UnwindPlan::Row;
> - *newrow = *row.get();
> - row.reset(newrow);
> -
> - // mov %rsp, %rbp has executed
> - row->GetCFAValue().SetIsRegisterPlusOffset(m_lldb_fp_regnum, 2 * m_wordsize);
> - row->SetOffset(prologue_size); /// 3 or 4 bytes depending on arch
> - unwind_plan.AppendRow(row);
> -
> - newrow = new UnwindPlan::Row;
> - *newrow = *row.get();
> - row.reset(newrow);
> -
> - unwind_plan.SetPlanValidAddressRange(func);
> - unwind_plan.SetSourceName("fast unwind assembly profiling");
> - unwind_plan.SetSourcedFromCompiler(eLazyBoolNo);
> - unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolNo);
> - return true;
> -}
> -
> -bool AssemblyParse_x86::find_first_non_prologue_insn(Address &address) {
> - m_cur_insn = m_func_bounds.GetBaseAddress();
> - if (!m_cur_insn.IsValid()) {
> - return false;
> + if (process_sp->GetTarget().ReadMemory(
> + func.GetBaseAddress(), prefer_file_cache, function_text.data(),
> + func.GetByteSize(), error) == func.GetByteSize()) {
> + RegisterContextSP reg_ctx(thread.GetRegisterContext());
> + m_assembly_inspection_engine->Initialize(reg_ctx);
> + return m_assembly_inspection_engine->GetNonCallSiteUnwindPlanFromAssembly(
> + function_text.data(), func.GetByteSize(), func, unwind_plan);
> }
> -
> - const bool prefer_file_cache = true;
> - Target *target = m_exe_ctx.GetTargetPtr();
> - while (m_func_bounds.ContainsFileAddress(m_cur_insn)) {
> - Error error;
> - int insn_len, offset, regno;
> - if (!instruction_length(m_cur_insn, insn_len) ||
> - insn_len > kMaxInstructionByteSize || insn_len == 0) {
> - // An error parsing the instruction, i.e. probably data/garbage - stop
> - // scanning
> - break;
> - }
> - if (target->ReadMemory(m_cur_insn, prefer_file_cache, m_cur_insn_bytes,
> - insn_len, error) == static_cast<size_t>(-1)) {
> - // Error reading the instruction out of the file, stop scanning
> - break;
> - }
> -
> - if (push_rbp_pattern_p() || mov_rsp_rbp_pattern_p() ||
> - sub_rsp_pattern_p(offset) || push_reg_p(regno) ||
> - mov_reg_to_local_stack_frame_p(regno, offset) ||
> - (lea_rsp_pattern_p(offset) && offset < 0)) {
> - m_cur_insn.SetOffset(m_cur_insn.GetOffset() + insn_len);
> - continue;
> - }
> -
> - // Unknown non-prologue instruction - stop scanning
> - break;
> - }
> -
> - address = m_cur_insn;
> - return true;
> -}
> -
> -//-----------------------------------------------------------------------------------------------
> -// UnwindAssemblyParser_x86 method definitions
> -//-----------------------------------------------------------------------------------------------
> -
> -UnwindAssembly_x86::UnwindAssembly_x86(const ArchSpec &arch, int cpu)
> - : lldb_private::UnwindAssembly(arch), m_cpu(cpu), m_arch(arch) {}
> -
> -UnwindAssembly_x86::~UnwindAssembly_x86() {}
> -
> -bool UnwindAssembly_x86::GetNonCallSiteUnwindPlanFromAssembly(
> - AddressRange &func, Thread &thread, UnwindPlan &unwind_plan) {
> - ExecutionContext exe_ctx(thread.shared_from_this());
> - AssemblyParse_x86 asm_parse(exe_ctx, m_cpu, m_arch, func);
> - return asm_parse.get_non_call_site_unwind_plan(unwind_plan);
> + return false;
> }
>
> bool UnwindAssembly_x86::AugmentUnwindPlanFromCallSite(
> @@ -1235,9 +75,10 @@ bool UnwindAssembly_x86::AugmentUnwindPl
>
> int wordsize = 8;
> ProcessSP process_sp(thread.GetProcess());
> - if (process_sp) {
> - wordsize = process_sp->GetTarget().GetArchitecture().GetAddressByteSize();
> - }
> + if (process_sp.get() == nullptr)
> + return false;
> +
> + wordsize = process_sp->GetTarget().GetArchitecture().GetAddressByteSize();
>
> RegisterNumber sp_regnum(thread, eRegisterKindGeneric,
> LLDB_REGNUM_GENERIC_SP);
> @@ -1314,9 +155,21 @@ bool UnwindAssembly_x86::AugmentUnwindPl
> }
>
> if (do_augment_unwindplan) {
> - ExecutionContext exe_ctx(thread.shared_from_this());
> - AssemblyParse_x86 asm_parse(exe_ctx, m_cpu, m_arch, func);
> - return asm_parse.augment_unwind_plan_from_call_site(func, unwind_plan);
> + if (!func.GetBaseAddress().IsValid() || func.GetByteSize() == 0)
> + return false;
> + if (m_assembly_inspection_engine == nullptr)
> + return false;
> + const bool prefer_file_cache = true;
> + std::vector<uint8_t> function_text(func.GetByteSize());
> + Error error;
> + if (process_sp->GetTarget().ReadMemory(
> + func.GetBaseAddress(), prefer_file_cache, function_text.data(),
> + func.GetByteSize(), error) == func.GetByteSize()) {
> + RegisterContextSP reg_ctx(thread.GetRegisterContext());
> + m_assembly_inspection_engine->Initialize(reg_ctx);
> + return m_assembly_inspection_engine->AugmentUnwindPlanFromCallSite(
> + function_text.data(), func.GetByteSize(), func, unwind_plan, reg_ctx);
> + }
> }
>
> return false;
> @@ -1362,16 +215,38 @@ bool UnwindAssembly_x86::GetFastUnwindPl
> bool UnwindAssembly_x86::FirstNonPrologueInsn(
> AddressRange &func, const ExecutionContext &exe_ctx,
> Address &first_non_prologue_insn) {
> - AssemblyParse_x86 asm_parse(exe_ctx, m_cpu, m_arch, func);
> - return asm_parse.find_first_non_prologue_insn(first_non_prologue_insn);
> +
> + if (!func.GetBaseAddress().IsValid())
> + return false;
> +
> + Target *target = exe_ctx.GetTargetPtr();
> + if (target == nullptr)
> + return false;
> +
> + if (m_assembly_inspection_engine == nullptr)
> + return false;
> +
> + const bool prefer_file_cache = true;
> + std::vector<uint8_t> function_text(func.GetByteSize());
> + Error error;
> + if (target->ReadMemory(func.GetBaseAddress(), prefer_file_cache,
> + function_text.data(), func.GetByteSize(),
> + error) == func.GetByteSize()) {
> + size_t offset;
> + if (m_assembly_inspection_engine->FindFirstNonPrologueInstruction(
> + function_text.data(), func.GetByteSize(), offset)) {
> + first_non_prologue_insn = func.GetBaseAddress();
> + first_non_prologue_insn.Slide(offset);
> + }
> + return true;
> + }
> + return false;
> }
>
> UnwindAssembly *UnwindAssembly_x86::CreateInstance(const ArchSpec &arch) {
> const llvm::Triple::ArchType cpu = arch.GetMachine();
> - if (cpu == llvm::Triple::x86)
> - return new UnwindAssembly_x86(arch, k_i386);
> - else if (cpu == llvm::Triple::x86_64)
> - return new UnwindAssembly_x86(arch, k_x86_64);
> + if (cpu == llvm::Triple::x86 || cpu == llvm::Triple::x86_64)
> + return new UnwindAssembly_x86(arch);
> return NULL;
> }
>
>
> Modified: lldb/trunk/source/Plugins/UnwindAssembly/x86/UnwindAssembly-x86.h
> URL: http://llvm.org/viewvc/llvm-project/lldb/trunk/source/Plugins/UnwindAssembly/x86/UnwindAssembly-x86.h?rev=282565&r1=282564&r2=282565&view=diff
> ==============================================================================
> --- lldb/trunk/source/Plugins/UnwindAssembly/x86/UnwindAssembly-x86.h (original)
> +++ lldb/trunk/source/Plugins/UnwindAssembly/x86/UnwindAssembly-x86.h Tue Sep 27 21:52:19 2016
> @@ -13,7 +13,7 @@
> // C Includes
> // C++ Includes
> // Other libraries and framework includes
> -#include "llvm-c/Disassembler.h"
> +#include "x86AssemblyInspectionEngine.h"
>
> // Project includes
> #include "lldb/Target/UnwindAssembly.h"
> @@ -62,10 +62,11 @@ public:
> uint32_t GetPluginVersion() override;
>
> private:
> - UnwindAssembly_x86(const lldb_private::ArchSpec &arch, int cpu);
> + UnwindAssembly_x86(const lldb_private::ArchSpec &arch);
>
> - int m_cpu;
> lldb_private::ArchSpec m_arch;
> +
> + lldb_private::x86AssemblyInspectionEngine *m_assembly_inspection_engine;
> };
>
> #endif // liblldb_UnwindAssembly_x86_h_
>
> Added: lldb/trunk/source/Plugins/UnwindAssembly/x86/x86AssemblyInspectionEngine.cpp
> URL: http://llvm.org/viewvc/llvm-project/lldb/trunk/source/Plugins/UnwindAssembly/x86/x86AssemblyInspectionEngine.cpp?rev=282565&view=auto
> ==============================================================================
> --- lldb/trunk/source/Plugins/UnwindAssembly/x86/x86AssemblyInspectionEngine.cpp (added)
> +++ lldb/trunk/source/Plugins/UnwindAssembly/x86/x86AssemblyInspectionEngine.cpp Tue Sep 27 21:52:19 2016
> @@ -0,0 +1,1117 @@
> +//===-- x86AssemblyInspectionEngine.cpp -------------------------*- C++ -*-===//
> +//
> +// The LLVM Compiler Infrastructure
> +//
> +// This file is distributed under the University of Illinois Open Source
> +// License. See LICENSE.TXT for details.
> +//
> +//===----------------------------------------------------------------------===//
> +
> +#include "x86AssemblyInspectionEngine.h"
> +
> +#include "llvm-c/Disassembler.h"
> +
> +#include "lldb/Core/Address.h"
> +#include "lldb/Symbol/UnwindPlan.h"
> +#include "lldb/Target/RegisterContext.h"
> +#include "lldb/Target/UnwindAssembly.h"
> +
> +using namespace lldb_private;
> +using namespace lldb;
> +
> +x86AssemblyInspectionEngine::x86AssemblyInspectionEngine(const ArchSpec &arch)
> + : m_cur_insn(nullptr), m_machine_ip_regnum(LLDB_INVALID_REGNUM),
> + m_machine_sp_regnum(LLDB_INVALID_REGNUM),
> + m_machine_fp_regnum(LLDB_INVALID_REGNUM),
> + m_lldb_ip_regnum(LLDB_INVALID_REGNUM),
> + m_lldb_sp_regnum(LLDB_INVALID_REGNUM),
> + m_lldb_fp_regnum(LLDB_INVALID_REGNUM),
> +
> + m_reg_map(), m_arch(arch), m_cpu(k_cpu_unspecified), m_wordsize(-1),
> + m_register_map_initialized(false), m_disasm_context() {
> + m_disasm_context = ::LLVMCreateDisasm("x86_64-apple-macosx", nullptr,
> + /*TagType=*/1, nullptr, nullptr);
> + // ::LLVMCreateDisasm(arch.GetTriple().getTriple().c_str(), nullptr,
> + // /*TagType=*/1, nullptr, nullptr);
> +}
> +
> +x86AssemblyInspectionEngine::~x86AssemblyInspectionEngine() {
> + ::LLVMDisasmDispose(m_disasm_context);
> +}
> +
> +void x86AssemblyInspectionEngine::Initialize(RegisterContextSP ®_ctx) {
> + m_cpu = k_cpu_unspecified;
> + m_wordsize = -1;
> + m_register_map_initialized = false;
> +
> + const llvm::Triple::ArchType cpu = m_arch.GetMachine();
> + if (cpu == llvm::Triple::x86)
> + m_cpu = k_i386;
> + else if (cpu == llvm::Triple::x86_64)
> + m_cpu = k_x86_64;
> +
> + if (m_cpu == k_cpu_unspecified)
> + return;
> +
> + if (reg_ctx.get() == nullptr)
> + return;
> +
> + if (m_cpu == k_i386) {
> + m_machine_ip_regnum = k_machine_eip;
> + m_machine_sp_regnum = k_machine_esp;
> + m_machine_fp_regnum = k_machine_ebp;
> + m_wordsize = 4;
> +
> + struct lldb_reg_info reginfo;
> + reginfo.name = "eax";
> + m_reg_map[k_machine_eax] = reginfo;
> + reginfo.name = "edx";
> + m_reg_map[k_machine_edx] = reginfo;
> + reginfo.name = "esp";
> + m_reg_map[k_machine_esp] = reginfo;
> + reginfo.name = "esi";
> + m_reg_map[k_machine_esi] = reginfo;
> + reginfo.name = "eip";
> + m_reg_map[k_machine_eip] = reginfo;
> + reginfo.name = "ecx";
> + m_reg_map[k_machine_ecx] = reginfo;
> + reginfo.name = "ebx";
> + m_reg_map[k_machine_ebx] = reginfo;
> + reginfo.name = "ebp";
> + m_reg_map[k_machine_ebp] = reginfo;
> + reginfo.name = "edi";
> + m_reg_map[k_machine_edi] = reginfo;
> + } else {
> + m_machine_ip_regnum = k_machine_rip;
> + m_machine_sp_regnum = k_machine_rsp;
> + m_machine_fp_regnum = k_machine_rbp;
> + m_wordsize = 8;
> +
> + struct lldb_reg_info reginfo;
> + reginfo.name = "rax";
> + m_reg_map[k_machine_rax] = reginfo;
> + reginfo.name = "rdx";
> + m_reg_map[k_machine_rdx] = reginfo;
> + reginfo.name = "rsp";
> + m_reg_map[k_machine_rsp] = reginfo;
> + reginfo.name = "rsi";
> + m_reg_map[k_machine_rsi] = reginfo;
> + reginfo.name = "r8";
> + m_reg_map[k_machine_r8] = reginfo;
> + reginfo.name = "r10";
> + m_reg_map[k_machine_r10] = reginfo;
> + reginfo.name = "r12";
> + m_reg_map[k_machine_r12] = reginfo;
> + reginfo.name = "r14";
> + m_reg_map[k_machine_r14] = reginfo;
> + reginfo.name = "rip";
> + m_reg_map[k_machine_rip] = reginfo;
> + reginfo.name = "rcx";
> + m_reg_map[k_machine_rcx] = reginfo;
> + reginfo.name = "rbx";
> + m_reg_map[k_machine_rbx] = reginfo;
> + reginfo.name = "rbp";
> + m_reg_map[k_machine_rbp] = reginfo;
> + reginfo.name = "rdi";
> + m_reg_map[k_machine_rdi] = reginfo;
> + reginfo.name = "r9";
> + m_reg_map[k_machine_r9] = reginfo;
> + reginfo.name = "r11";
> + m_reg_map[k_machine_r11] = reginfo;
> + reginfo.name = "r13";
> + m_reg_map[k_machine_r13] = reginfo;
> + reginfo.name = "r15";
> + m_reg_map[k_machine_r15] = reginfo;
> + }
> +
> + for (MachineRegnumToNameAndLLDBRegnum::iterator it = m_reg_map.begin();
> + it != m_reg_map.end(); ++it) {
> + const RegisterInfo *ri = reg_ctx->GetRegisterInfoByName(it->second.name);
> + if (ri)
> + it->second.lldb_regnum = ri->kinds[eRegisterKindLLDB];
> + }
> +
> + uint32_t lldb_regno;
> + if (machine_regno_to_lldb_regno(m_machine_sp_regnum, lldb_regno))
> + m_lldb_sp_regnum = lldb_regno;
> + if (machine_regno_to_lldb_regno(m_machine_fp_regnum, lldb_regno))
> + m_lldb_fp_regnum = lldb_regno;
> + if (machine_regno_to_lldb_regno(m_machine_ip_regnum, lldb_regno))
> + m_lldb_ip_regnum = lldb_regno;
> +
> + m_register_map_initialized = true;
> +}
> +
> +void x86AssemblyInspectionEngine::Initialize(
> + std::vector<lldb_reg_info> ®_info) {
> + m_cpu = k_cpu_unspecified;
> + m_wordsize = -1;
> + m_register_map_initialized = false;
> +
> + const llvm::Triple::ArchType cpu = m_arch.GetMachine();
> + if (cpu == llvm::Triple::x86)
> + m_cpu = k_i386;
> + else if (cpu == llvm::Triple::x86_64)
> + m_cpu = k_x86_64;
> +
> + if (m_cpu == k_cpu_unspecified)
> + return;
> +
> + if (m_cpu == k_i386) {
> + m_machine_ip_regnum = k_machine_eip;
> + m_machine_sp_regnum = k_machine_esp;
> + m_machine_fp_regnum = k_machine_ebp;
> + m_wordsize = 4;
> +
> + struct lldb_reg_info reginfo;
> + reginfo.name = "eax";
> + m_reg_map[k_machine_eax] = reginfo;
> + reginfo.name = "edx";
> + m_reg_map[k_machine_edx] = reginfo;
> + reginfo.name = "esp";
> + m_reg_map[k_machine_esp] = reginfo;
> + reginfo.name = "esi";
> + m_reg_map[k_machine_esi] = reginfo;
> + reginfo.name = "eip";
> + m_reg_map[k_machine_eip] = reginfo;
> + reginfo.name = "ecx";
> + m_reg_map[k_machine_ecx] = reginfo;
> + reginfo.name = "ebx";
> + m_reg_map[k_machine_ebx] = reginfo;
> + reginfo.name = "ebp";
> + m_reg_map[k_machine_ebp] = reginfo;
> + reginfo.name = "edi";
> + m_reg_map[k_machine_edi] = reginfo;
> + } else {
> + m_machine_ip_regnum = k_machine_rip;
> + m_machine_sp_regnum = k_machine_rsp;
> + m_machine_fp_regnum = k_machine_rbp;
> + m_wordsize = 8;
> +
> + struct lldb_reg_info reginfo;
> + reginfo.name = "rax";
> + m_reg_map[k_machine_rax] = reginfo;
> + reginfo.name = "rdx";
> + m_reg_map[k_machine_rdx] = reginfo;
> + reginfo.name = "rsp";
> + m_reg_map[k_machine_rsp] = reginfo;
> + reginfo.name = "rsi";
> + m_reg_map[k_machine_rsi] = reginfo;
> + reginfo.name = "r8";
> + m_reg_map[k_machine_r8] = reginfo;
> + reginfo.name = "r10";
> + m_reg_map[k_machine_r10] = reginfo;
> + reginfo.name = "r12";
> + m_reg_map[k_machine_r12] = reginfo;
> + reginfo.name = "r14";
> + m_reg_map[k_machine_r14] = reginfo;
> + reginfo.name = "rip";
> + m_reg_map[k_machine_rip] = reginfo;
> + reginfo.name = "rcx";
> + m_reg_map[k_machine_rcx] = reginfo;
> + reginfo.name = "rbx";
> + m_reg_map[k_machine_rbx] = reginfo;
> + reginfo.name = "rbp";
> + m_reg_map[k_machine_rbp] = reginfo;
> + reginfo.name = "rdi";
> + m_reg_map[k_machine_rdi] = reginfo;
> + reginfo.name = "r9";
> + m_reg_map[k_machine_r9] = reginfo;
> + reginfo.name = "r11";
> + m_reg_map[k_machine_r11] = reginfo;
> + reginfo.name = "r13";
> + m_reg_map[k_machine_r13] = reginfo;
> + reginfo.name = "r15";
> + m_reg_map[k_machine_r15] = reginfo;
> + }
> +
> + for (MachineRegnumToNameAndLLDBRegnum::iterator it = m_reg_map.begin();
> + it != m_reg_map.end(); ++it) {
> + for (size_t i = 0; i < reg_info.size(); ++i) {
> + if (::strcmp(reg_info[i].name, it->second.name) == 0) {
> + it->second.lldb_regnum = reg_info[i].lldb_regnum;
> + break;
> + }
> + }
> + }
> +
> + uint32_t lldb_regno;
> + if (machine_regno_to_lldb_regno(m_machine_sp_regnum, lldb_regno))
> + m_lldb_sp_regnum = lldb_regno;
> + if (machine_regno_to_lldb_regno(m_machine_fp_regnum, lldb_regno))
> + m_lldb_fp_regnum = lldb_regno;
> + if (machine_regno_to_lldb_regno(m_machine_ip_regnum, lldb_regno))
> + m_lldb_ip_regnum = lldb_regno;
> +
> + m_register_map_initialized = true;
> +}
> +
> +// This function expects an x86 native register number (i.e. the bits stripped
> +// out of the
> +// actual instruction), not an lldb register number.
> +//
> +// FIXME: This is ABI dependent, it shouldn't be hardcoded here.
> +
> +bool x86AssemblyInspectionEngine::nonvolatile_reg_p(int machine_regno) {
> + if (m_cpu == k_i386) {
> + switch (machine_regno) {
> + case k_machine_ebx:
> + case k_machine_ebp: // not actually a nonvolatile but often treated as such
> + // by convention
> + case k_machine_esi:
> + case k_machine_edi:
> + case k_machine_esp:
> + return true;
> + default:
> + return false;
> + }
> + }
> + if (m_cpu == k_x86_64) {
> + switch (machine_regno) {
> + case k_machine_rbx:
> + case k_machine_rsp:
> + case k_machine_rbp: // not actually a nonvolatile but often treated as such
> + // by convention
> + case k_machine_r12:
> + case k_machine_r13:
> + case k_machine_r14:
> + case k_machine_r15:
> + return true;
> + default:
> + return false;
> + }
> + }
> + return false;
> +}
> +
> +// Macro to detect if this is a REX mode prefix byte.
> +#define REX_W_PREFIX_P(opcode) (((opcode) & (~0x5)) == 0x48)
> +
> +// The high bit which should be added to the source register number (the "R"
> +// bit)
> +#define REX_W_SRCREG(opcode) (((opcode)&0x4) >> 2)
> +
> +// The high bit which should be added to the destination register number (the
> +// "B" bit)
> +#define REX_W_DSTREG(opcode) ((opcode)&0x1)
> +
> +// pushq %rbp [0x55]
> +bool x86AssemblyInspectionEngine::push_rbp_pattern_p() {
> + uint8_t *p = m_cur_insn;
> + if (*p == 0x55)
> + return true;
> + return false;
> +}
> +
> +// pushq $0 ; the first instruction in start() [0x6a 0x00]
> +bool x86AssemblyInspectionEngine::push_0_pattern_p() {
> + uint8_t *p = m_cur_insn;
> + if (*p == 0x6a && *(p + 1) == 0x0)
> + return true;
> + return false;
> +}
> +
> +// pushq $0
> +// pushl $0
> +bool x86AssemblyInspectionEngine::push_imm_pattern_p() {
> + uint8_t *p = m_cur_insn;
> + if (*p == 0x68 || *p == 0x6a)
> + return true;
> + return false;
> +}
> +
> +// movq %rsp, %rbp [0x48 0x8b 0xec] or [0x48 0x89 0xe5]
> +// movl %esp, %ebp [0x8b 0xec] or [0x89 0xe5]
> +bool x86AssemblyInspectionEngine::mov_rsp_rbp_pattern_p() {
> + uint8_t *p = m_cur_insn;
> + if (m_wordsize == 8 && *p == 0x48)
> + p++;
> + if (*(p) == 0x8b && *(p + 1) == 0xec)
> + return true;
> + if (*(p) == 0x89 && *(p + 1) == 0xe5)
> + return true;
> + return false;
> +}
> +
> +// subq $0x20, %rsp
> +bool x86AssemblyInspectionEngine::sub_rsp_pattern_p(int &amount) {
> + uint8_t *p = m_cur_insn;
> + if (m_wordsize == 8 && *p == 0x48)
> + p++;
> + // 8-bit immediate operand
> + if (*p == 0x83 && *(p + 1) == 0xec) {
> + amount = (int8_t) * (p + 2);
> + return true;
> + }
> + // 32-bit immediate operand
> + if (*p == 0x81 && *(p + 1) == 0xec) {
> + amount = (int32_t)extract_4(p + 2);
> + return true;
> + }
> + return false;
> +}
> +
> +// addq $0x20, %rsp
> +bool x86AssemblyInspectionEngine::add_rsp_pattern_p(int &amount) {
> + uint8_t *p = m_cur_insn;
> + if (m_wordsize == 8 && *p == 0x48)
> + p++;
> + // 8-bit immediate operand
> + if (*p == 0x83 && *(p + 1) == 0xc4) {
> + amount = (int8_t) * (p + 2);
> + return true;
> + }
> + // 32-bit immediate operand
> + if (*p == 0x81 && *(p + 1) == 0xc4) {
> + amount = (int32_t)extract_4(p + 2);
> + return true;
> + }
> + return false;
> +}
> +
> +// lea esp, [esp - 0x28]
> +// lea esp, [esp + 0x28]
> +bool x86AssemblyInspectionEngine::lea_rsp_pattern_p(int &amount) {
> + uint8_t *p = m_cur_insn;
> + if (m_wordsize == 8 && *p == 0x48)
> + p++;
> +
> + // Check opcode
> + if (*p != 0x8d)
> + return false;
> +
> + // 8 bit displacement
> + if (*(p + 1) == 0x64 && (*(p + 2) & 0x3f) == 0x24) {
> + amount = (int8_t) * (p + 3);
> + return true;
> + }
> +
> + // 32 bit displacement
> + if (*(p + 1) == 0xa4 && (*(p + 2) & 0x3f) == 0x24) {
> + amount = (int32_t)extract_4(p + 3);
> + return true;
> + }
> +
> + return false;
> +}
> +
> +// pushq %rbx
> +// pushl %ebx
> +bool x86AssemblyInspectionEngine::push_reg_p(int ®no) {
> + uint8_t *p = m_cur_insn;
> + int regno_prefix_bit = 0;
> + // If we have a rex prefix byte, check to see if a B bit is set
> + if (m_wordsize == 8 && *p == 0x41) {
> + regno_prefix_bit = 1 << 3;
> + p++;
> + }
> + if (*p >= 0x50 && *p <= 0x57) {
> + regno = (*p - 0x50) | regno_prefix_bit;
> + return true;
> + }
> + return false;
> +}
> +
> +// popq %rbx
> +// popl %ebx
> +bool x86AssemblyInspectionEngine::pop_reg_p(int ®no) {
> + uint8_t *p = m_cur_insn;
> + int regno_prefix_bit = 0;
> + // If we have a rex prefix byte, check to see if a B bit is set
> + if (m_wordsize == 8 && *p == 0x41) {
> + regno_prefix_bit = 1 << 3;
> + p++;
> + }
> + if (*p >= 0x58 && *p <= 0x5f) {
> + regno = (*p - 0x58) | regno_prefix_bit;
> + return true;
> + }
> + return false;
> +}
> +
> +// popq %rbp [0x5d]
> +// popl %ebp [0x5d]
> +bool x86AssemblyInspectionEngine::pop_rbp_pattern_p() {
> + uint8_t *p = m_cur_insn;
> + return (*p == 0x5d);
> +}
> +
> +// leave [0xc9]
> +bool x86AssemblyInspectionEngine::leave_pattern_p() {
> + uint8_t *p = m_cur_insn;
> + return (*p == 0xc9);
> +}
> +
> +// call $0 [0xe8 0x0 0x0 0x0 0x0]
> +bool x86AssemblyInspectionEngine::call_next_insn_pattern_p() {
> + uint8_t *p = m_cur_insn;
> + return (*p == 0xe8) && (*(p + 1) == 0x0) && (*(p + 2) == 0x0) &&
> + (*(p + 3) == 0x0) && (*(p + 4) == 0x0);
> +}
> +
> +// Look for an instruction sequence storing a nonvolatile register
> +// on to the stack frame.
> +
> +// movq %rax, -0x10(%rbp) [0x48 0x89 0x45 0xf0]
> +// movl %eax, -0xc(%ebp) [0x89 0x45 0xf4]
> +
> +// The offset value returned in rbp_offset will be positive --
> +// but it must be subtraced from the frame base register to get
> +// the actual location. The positive value returned for the offset
> +// is a convention used elsewhere for CFA offsets et al.
> +
> +bool x86AssemblyInspectionEngine::mov_reg_to_local_stack_frame_p(
> + int ®no, int &rbp_offset) {
> + uint8_t *p = m_cur_insn;
> + int src_reg_prefix_bit = 0;
> + int target_reg_prefix_bit = 0;
> +
> + if (m_wordsize == 8 && REX_W_PREFIX_P(*p)) {
> + src_reg_prefix_bit = REX_W_SRCREG(*p) << 3;
> + target_reg_prefix_bit = REX_W_DSTREG(*p) << 3;
> + if (target_reg_prefix_bit == 1) {
> + // rbp/ebp don't need a prefix bit - we know this isn't the
> + // reg we care about.
> + return false;
> + }
> + p++;
> + }
> +
> + if (*p == 0x89) {
> + /* Mask off the 3-5 bits which indicate the destination register
> + if this is a ModR/M byte. */
> + int opcode_destreg_masked_out = *(p + 1) & (~0x38);
> +
> + /* Is this a ModR/M byte with Mod bits 01 and R/M bits 101
> + and three bits between them, e.g. 01nnn101
> + We're looking for a destination of ebp-disp8 or ebp-disp32. */
> + int immsize;
> + if (opcode_destreg_masked_out == 0x45)
> + immsize = 2;
> + else if (opcode_destreg_masked_out == 0x85)
> + immsize = 4;
> + else
> + return false;
> +
> + int offset = 0;
> + if (immsize == 2)
> + offset = (int8_t) * (p + 2);
> + if (immsize == 4)
> + offset = (uint32_t)extract_4(p + 2);
> + if (offset > 0)
> + return false;
> +
> + regno = ((*(p + 1) >> 3) & 0x7) | src_reg_prefix_bit;
> + rbp_offset = offset > 0 ? offset : -offset;
> + return true;
> + }
> + return false;
> +}
> +
> +// ret [0xc9] or [0xc2 imm8] or [0xca imm8]
> +bool x86AssemblyInspectionEngine::ret_pattern_p() {
> + uint8_t *p = m_cur_insn;
> + if (*p == 0xc9 || *p == 0xc2 || *p == 0xca || *p == 0xc3)
> + return true;
> + return false;
> +}
> +
> +uint32_t x86AssemblyInspectionEngine::extract_4(uint8_t *b) {
> + uint32_t v = 0;
> + for (int i = 3; i >= 0; i--)
> + v = (v << 8) | b[i];
> + return v;
> +}
> +
> +bool x86AssemblyInspectionEngine::instruction_length(uint8_t *insn_p,
> + int &length) {
> +
> + const uint32_t max_op_byte_size = m_arch.GetMaximumOpcodeByteSize();
> + llvm::SmallVector<uint8_t, 32> opcode_data;
> + opcode_data.resize(max_op_byte_size);
> +
> + char out_string[512];
> + const size_t inst_size =
> + ::LLVMDisasmInstruction(m_disasm_context, insn_p, max_op_byte_size, 0,
> + out_string, sizeof(out_string));
> +
> + length = inst_size;
> + return true;
> +}
> +
> +bool x86AssemblyInspectionEngine::machine_regno_to_lldb_regno(
> + int machine_regno, uint32_t &lldb_regno) {
> + MachineRegnumToNameAndLLDBRegnum::iterator it = m_reg_map.find(machine_regno);
> + if (it != m_reg_map.end()) {
> + lldb_regno = it->second.lldb_regnum;
> + return true;
> + }
> + return false;
> + return false;
> +}
> +
> +bool x86AssemblyInspectionEngine::GetNonCallSiteUnwindPlanFromAssembly(
> + uint8_t *data, size_t size, AddressRange &func_range,
> + UnwindPlan &unwind_plan) {
> + unwind_plan.Clear();
> +
> + if (data == nullptr || size == 0)
> + return false;
> +
> + if (m_register_map_initialized == false)
> + return false;
> +
> + addr_t current_func_text_offset = 0;
> + int current_sp_bytes_offset_from_cfa = 0;
> + UnwindPlan::Row::RegisterLocation initial_regloc;
> + UnwindPlan::RowSP row(new UnwindPlan::Row);
> +
> + unwind_plan.SetPlanValidAddressRange(func_range);
> + unwind_plan.SetRegisterKind(eRegisterKindLLDB);
> +
> + // At the start of the function, find the CFA by adding wordsize to the SP
> + // register
> + row->SetOffset(current_func_text_offset);
> + row->GetCFAValue().SetIsRegisterPlusOffset(m_lldb_sp_regnum, m_wordsize);
> +
> + // caller's stack pointer value before the call insn is the CFA address
> + initial_regloc.SetIsCFAPlusOffset(0);
> + row->SetRegisterInfo(m_lldb_sp_regnum, initial_regloc);
> +
> + // saved instruction pointer can be found at CFA - wordsize.
> + current_sp_bytes_offset_from_cfa = m_wordsize;
> + initial_regloc.SetAtCFAPlusOffset(-current_sp_bytes_offset_from_cfa);
> + row->SetRegisterInfo(m_lldb_ip_regnum, initial_regloc);
> +
> + unwind_plan.AppendRow(row);
> +
> + // Allocate a new Row, populate it with the existing Row contents.
> + UnwindPlan::Row *newrow = new UnwindPlan::Row;
> + *newrow = *row.get();
> + row.reset(newrow);
> +
> + // Track which registers have been saved so far in the prologue.
> + // If we see another push of that register, it's not part of the prologue.
> + // The register numbers used here are the machine register #'s
> + // (i386_register_numbers, x86_64_register_numbers).
> + std::vector<bool> saved_registers(32, false);
> +
> + // Once the prologue has completed we'll save a copy of the unwind
> + // instructions
> + // If there is an epilogue in the middle of the function, after that epilogue
> + // we'll reinstate
> + // the unwind setup -- we assume that some code path jumps over the
> + // mid-function epilogue
> +
> + UnwindPlan::RowSP prologue_completed_row; // copy of prologue row of CFI
> + int prologue_completed_sp_bytes_offset_from_cfa; // The sp value before the
> + // epilogue started executed
> + std::vector<bool> prologue_completed_saved_registers;
> +
> + while (current_func_text_offset < size) {
> + int stack_offset, insn_len;
> + int machine_regno; // register numbers masked directly out of instructions
> + uint32_t lldb_regno; // register numbers in lldb's eRegisterKindLLDB
> + // numbering scheme
> +
> + bool in_epilogue = false; // we're in the middle of an epilogue sequence
> + bool row_updated = false; // The UnwindPlan::Row 'row' has been updated
> +
> + m_cur_insn = data + current_func_text_offset;
> + if (!instruction_length(m_cur_insn, insn_len) || insn_len == 0 ||
> + insn_len > kMaxInstructionByteSize) {
> + // An unrecognized/junk instruction
> + break;
> + }
> +
> + if (push_rbp_pattern_p()) {
> + current_sp_bytes_offset_from_cfa += m_wordsize;
> + row->GetCFAValue().SetOffset(current_sp_bytes_offset_from_cfa);
> + UnwindPlan::Row::RegisterLocation regloc;
> + regloc.SetAtCFAPlusOffset(-row->GetCFAValue().GetOffset());
> + row->SetRegisterInfo(m_lldb_fp_regnum, regloc);
> + saved_registers[m_machine_fp_regnum] = true;
> + row_updated = true;
> + }
> +
> + else if (mov_rsp_rbp_pattern_p()) {
> + row->GetCFAValue().SetIsRegisterPlusOffset(
> + m_lldb_fp_regnum, row->GetCFAValue().GetOffset());
> + row_updated = true;
> + }
> +
> + // This is the start() function (or a pthread equivalent), it starts with a
> + // pushl $0x0 which puts the
> + // saved pc value of 0 on the stack. In this case we want to pretend we
> + // didn't see a stack movement at all --
> + // normally the saved pc value is already on the stack by the time the
> + // function starts executing.
> + else if (push_0_pattern_p()) {
> + }
> +
> + else if (push_reg_p(machine_regno)) {
> + current_sp_bytes_offset_from_cfa += m_wordsize;
> + // the PUSH instruction has moved the stack pointer - if the CFA is set in
> + // terms of the stack pointer,
> + // we need to add a new row of instructions.
> + if (row->GetCFAValue().GetRegisterNumber() == m_lldb_sp_regnum) {
> + row->GetCFAValue().SetOffset(current_sp_bytes_offset_from_cfa);
> + row_updated = true;
> + }
> + // record where non-volatile (callee-saved, spilled) registers are saved
> + // on the stack
> + if (nonvolatile_reg_p(machine_regno) &&
> + machine_regno_to_lldb_regno(machine_regno, lldb_regno) &&
> + saved_registers[machine_regno] == false) {
> + UnwindPlan::Row::RegisterLocation regloc;
> + regloc.SetAtCFAPlusOffset(-current_sp_bytes_offset_from_cfa);
> + row->SetRegisterInfo(lldb_regno, regloc);
> + saved_registers[machine_regno] = true;
> + row_updated = true;
> + }
> + }
> +
> + else if (pop_reg_p(machine_regno)) {
> + current_sp_bytes_offset_from_cfa -= m_wordsize;
> +
> + if (nonvolatile_reg_p(machine_regno) &&
> + machine_regno_to_lldb_regno(machine_regno, lldb_regno) &&
> + saved_registers[machine_regno] == true) {
> + saved_registers[machine_regno] = false;
> + row->RemoveRegisterInfo(lldb_regno);
> +
> + if (machine_regno == (int)m_machine_fp_regnum) {
> + row->GetCFAValue().SetIsRegisterPlusOffset(
> + m_lldb_sp_regnum, row->GetCFAValue().GetOffset());
> + }
> +
> + in_epilogue = true;
> + row_updated = true;
> + }
> +
> + // the POP instruction has moved the stack pointer - if the CFA is set in
> + // terms of the stack pointer,
> + // we need to add a new row of instructions.
> + if (row->GetCFAValue().GetRegisterNumber() == m_lldb_sp_regnum) {
> + row->GetCFAValue().SetIsRegisterPlusOffset(
> + m_lldb_sp_regnum, current_sp_bytes_offset_from_cfa);
> + row_updated = true;
> + }
> + }
> +
> + // The LEAVE instruction moves the value from rbp into rsp and pops
> + // a value off the stack into rbp (restoring the caller's rbp value).
> + // It is the opposite of ENTER, or 'push rbp, mov rsp rbp'.
> + else if (leave_pattern_p()) {
> + // We're going to copy the value in rbp into rsp, so re-set the sp offset
> + // based on the CFAValue. Also, adjust it to recognize that we're popping
> + // the saved rbp value off the stack.
> + current_sp_bytes_offset_from_cfa = row->GetCFAValue().GetOffset();
> + current_sp_bytes_offset_from_cfa -= m_wordsize;
> + row->GetCFAValue().SetOffset(current_sp_bytes_offset_from_cfa);
> +
> + // rbp is restored to the caller's value
> + saved_registers[m_machine_fp_regnum] = false;
> + row->RemoveRegisterInfo(m_lldb_fp_regnum);
> +
> + // cfa is now in terms of rsp again.
> + row->GetCFAValue().SetIsRegisterPlusOffset(
> + m_lldb_sp_regnum, row->GetCFAValue().GetOffset());
> + row->GetCFAValue().SetOffset(current_sp_bytes_offset_from_cfa);
> +
> + in_epilogue = true;
> + row_updated = true;
> + }
> +
> + else if (mov_reg_to_local_stack_frame_p(machine_regno, stack_offset) &&
> + nonvolatile_reg_p(machine_regno) &&
> + machine_regno_to_lldb_regno(machine_regno, lldb_regno) &&
> + saved_registers[machine_regno] == false) {
> + saved_registers[machine_regno] = true;
> +
> + UnwindPlan::Row::RegisterLocation regloc;
> +
> + // stack_offset for 'movq %r15, -80(%rbp)' will be 80.
> + // In the Row, we want to express this as the offset from the CFA. If the
> + // frame base
> + // is rbp (like the above instruction), the CFA offset for rbp is probably
> + // 16. So we
> + // want to say that the value is stored at the CFA address - 96.
> + regloc.SetAtCFAPlusOffset(
> + -(stack_offset + row->GetCFAValue().GetOffset()));
> +
> + row->SetRegisterInfo(lldb_regno, regloc);
> +
> + row_updated = true;
> + }
> +
> + else if (sub_rsp_pattern_p(stack_offset)) {
> + current_sp_bytes_offset_from_cfa += stack_offset;
> + if (row->GetCFAValue().GetRegisterNumber() == m_lldb_sp_regnum) {
> + row->GetCFAValue().SetOffset(current_sp_bytes_offset_from_cfa);
> + row_updated = true;
> + }
> + }
> +
> + else if (add_rsp_pattern_p(stack_offset)) {
> + current_sp_bytes_offset_from_cfa -= stack_offset;
> + if (row->GetCFAValue().GetRegisterNumber() == m_lldb_sp_regnum) {
> + row->GetCFAValue().SetOffset(current_sp_bytes_offset_from_cfa);
> + row_updated = true;
> + }
> + in_epilogue = true;
> + }
> +
> + else if (lea_rsp_pattern_p(stack_offset)) {
> + current_sp_bytes_offset_from_cfa -= stack_offset;
> + if (row->GetCFAValue().GetRegisterNumber() == m_lldb_sp_regnum) {
> + row->GetCFAValue().SetOffset(current_sp_bytes_offset_from_cfa);
> + row_updated = true;
> + }
> + if (stack_offset > 0)
> + in_epilogue = true;
> + }
> +
> + else if (ret_pattern_p() && prologue_completed_row.get()) {
> + // Reinstate the saved prologue setup for any instructions
> + // that come after the ret instruction
> +
> + UnwindPlan::Row *newrow = new UnwindPlan::Row;
> + *newrow = *prologue_completed_row.get();
> + row.reset(newrow);
> + current_sp_bytes_offset_from_cfa =
> + prologue_completed_sp_bytes_offset_from_cfa;
> +
> + saved_registers.clear();
> + saved_registers.resize(prologue_completed_saved_registers.size(), false);
> + for (size_t i = 0; i < prologue_completed_saved_registers.size(); ++i) {
> + saved_registers[i] = prologue_completed_saved_registers[i];
> + }
> +
> + in_epilogue = true;
> + row_updated = true;
> + }
> +
> + // call next instruction
> + // call 0
> + // => pop %ebx
> + // This is used in i386 programs to get the PIC base address for finding
> + // global data
> + else if (call_next_insn_pattern_p()) {
> + current_sp_bytes_offset_from_cfa += m_wordsize;
> + if (row->GetCFAValue().GetRegisterNumber() == m_lldb_sp_regnum) {
> + row->GetCFAValue().SetOffset(current_sp_bytes_offset_from_cfa);
> + row_updated = true;
> + }
> + }
> +
> + if (row_updated) {
> + if (current_func_text_offset + insn_len < size) {
> + row->SetOffset(current_func_text_offset + insn_len);
> + unwind_plan.AppendRow(row);
> + // Allocate a new Row, populate it with the existing Row contents.
> + newrow = new UnwindPlan::Row;
> + *newrow = *row.get();
> + row.reset(newrow);
> + }
> + }
> +
> + if (in_epilogue == false && row_updated) {
> + // If we're not in an epilogue sequence, save the updated Row
> + UnwindPlan::Row *newrow = new UnwindPlan::Row;
> + *newrow = *row.get();
> + prologue_completed_row.reset(newrow);
> +
> + prologue_completed_saved_registers.clear();
> + prologue_completed_saved_registers.resize(saved_registers.size(), false);
> + for (size_t i = 0; i < saved_registers.size(); ++i) {
> + prologue_completed_saved_registers[i] = saved_registers[i];
> + }
> + }
> +
> + // We may change the sp value without adding a new Row necessarily -- keep
> + // track of it either way.
> + if (in_epilogue == false) {
> + prologue_completed_sp_bytes_offset_from_cfa =
> + current_sp_bytes_offset_from_cfa;
> + }
> +
> + m_cur_insn = m_cur_insn + insn_len;
> + current_func_text_offset += insn_len;
> + }
> +
> + unwind_plan.SetSourceName("assembly insn profiling");
> + unwind_plan.SetSourcedFromCompiler(eLazyBoolNo);
> + unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolYes);
> +
> + return true;
> +}
> +
> +bool x86AssemblyInspectionEngine::AugmentUnwindPlanFromCallSite(
> + uint8_t *data, size_t size, AddressRange &func_range,
> + UnwindPlan &unwind_plan, RegisterContextSP ®_ctx) {
> + Address addr_start = func_range.GetBaseAddress();
> + if (!addr_start.IsValid())
> + return false;
> +
> + // We either need a live RegisterContext, or we need the UnwindPlan to already
> + // be in the lldb register numbering scheme.
> + if (reg_ctx.get() == nullptr &&
> + unwind_plan.GetRegisterKind() != eRegisterKindLLDB)
> + return false;
> +
> + // Is original unwind_plan valid?
> + // unwind_plan should have at least one row which is ABI-default (CFA register
> + // is sp),
> + // and another row in mid-function.
> + if (unwind_plan.GetRowCount() < 2)
> + return false;
> +
> + UnwindPlan::RowSP first_row = unwind_plan.GetRowAtIndex(0);
> + if (first_row->GetOffset() != 0)
> + return false;
> + uint32_t cfa_reg = first_row->GetCFAValue().GetRegisterNumber();
> + if (unwind_plan.GetRegisterKind() != eRegisterKindLLDB) {
> + cfa_reg = reg_ctx->ConvertRegisterKindToRegisterNumber(
> + unwind_plan.GetRegisterKind(),
> + first_row->GetCFAValue().GetRegisterNumber());
> + }
> + if (cfa_reg != m_lldb_sp_regnum ||
> + first_row->GetCFAValue().GetOffset() != m_wordsize)
> + return false;
> +
> + UnwindPlan::RowSP original_last_row = unwind_plan.GetRowForFunctionOffset(-1);
> +
> + size_t offset = 0;
> + int row_id = 1;
> + bool unwind_plan_updated = false;
> + UnwindPlan::RowSP row(new UnwindPlan::Row(*first_row));
> + m_cur_insn = data + offset;
> +
> + // After a mid-function epilogue we will need to re-insert the original unwind
> + // rules
> + // so unwinds work for the remainder of the function. These aren't common
> + // with clang/gcc
> + // on x86 but it is possible.
> + bool reinstate_unwind_state = false;
> +
> + while (offset < size) {
> + m_cur_insn = data + offset;
> + int insn_len;
> + if (!instruction_length(m_cur_insn, insn_len) || insn_len == 0 ||
> + insn_len > kMaxInstructionByteSize) {
> + // An unrecognized/junk instruction.
> + break;
> + }
> +
> + // Advance offsets.
> + offset += insn_len;
> + m_cur_insn = data + offset;
> +
> + if (reinstate_unwind_state) {
> + // that was the last instruction of this function
> + if (offset >= size)
> + continue;
> +
> + UnwindPlan::RowSP new_row(new UnwindPlan::Row());
> + *new_row = *original_last_row;
> + new_row->SetOffset(offset);
> + unwind_plan.AppendRow(new_row);
> + row.reset(new UnwindPlan::Row());
> + *row = *new_row;
> + reinstate_unwind_state = false;
> + unwind_plan_updated = true;
> + continue;
> + }
> +
> + // If we already have one row for this instruction, we can continue.
> + while (row_id < unwind_plan.GetRowCount() &&
> + unwind_plan.GetRowAtIndex(row_id)->GetOffset() <= offset) {
> + row_id++;
> + }
> + UnwindPlan::RowSP original_row = unwind_plan.GetRowAtIndex(row_id - 1);
> + if (original_row->GetOffset() == offset) {
> + *row = *original_row;
> + continue;
> + }
> +
> + if (row_id == 0) {
> + // If we are here, compiler didn't generate CFI for prologue.
> + // This won't happen to GCC or clang.
> + // In this case, bail out directly.
> + return false;
> + }
> +
> + // Inspect the instruction to check if we need a new row for it.
> + cfa_reg = row->GetCFAValue().GetRegisterNumber();
> + if (unwind_plan.GetRegisterKind() != eRegisterKindLLDB) {
> + cfa_reg = reg_ctx->ConvertRegisterKindToRegisterNumber(
> + unwind_plan.GetRegisterKind(),
> + row->GetCFAValue().GetRegisterNumber());
> + }
> + if (cfa_reg == m_lldb_sp_regnum) {
> + // CFA register is sp.
> +
> + // call next instruction
> + // call 0
> + // => pop %ebx
> + if (call_next_insn_pattern_p()) {
> + row->SetOffset(offset);
> + row->GetCFAValue().IncOffset(m_wordsize);
> +
> + UnwindPlan::RowSP new_row(new UnwindPlan::Row(*row));
> + unwind_plan.InsertRow(new_row);
> + unwind_plan_updated = true;
> + continue;
> + }
> +
> + // push/pop register
> + int regno;
> + if (push_reg_p(regno)) {
> + row->SetOffset(offset);
> + row->GetCFAValue().IncOffset(m_wordsize);
> +
> + UnwindPlan::RowSP new_row(new UnwindPlan::Row(*row));
> + unwind_plan.InsertRow(new_row);
> + unwind_plan_updated = true;
> + continue;
> + }
> + if (pop_reg_p(regno)) {
> + // Technically, this might be a nonvolatile register recover in
> + // epilogue.
> + // We should reset RegisterInfo for the register.
> + // But in practice, previous rule for the register is still valid...
> + // So we ignore this case.
> +
> + row->SetOffset(offset);
> + row->GetCFAValue().IncOffset(-m_wordsize);
> +
> + UnwindPlan::RowSP new_row(new UnwindPlan::Row(*row));
> + unwind_plan.InsertRow(new_row);
> + unwind_plan_updated = true;
> + continue;
> + }
> +
> + // push imm
> + if (push_imm_pattern_p()) {
> + row->SetOffset(offset);
> + row->GetCFAValue().IncOffset(m_wordsize);
> + UnwindPlan::RowSP new_row(new UnwindPlan::Row(*row));
> + unwind_plan.InsertRow(new_row);
> + unwind_plan_updated = true;
> + continue;
> + }
> +
> + // add/sub %rsp/%esp
> + int amount;
> + if (add_rsp_pattern_p(amount)) {
> + row->SetOffset(offset);
> + row->GetCFAValue().IncOffset(-amount);
> +
> + UnwindPlan::RowSP new_row(new UnwindPlan::Row(*row));
> + unwind_plan.InsertRow(new_row);
> + unwind_plan_updated = true;
> + continue;
> + }
> + if (sub_rsp_pattern_p(amount)) {
> + row->SetOffset(offset);
> + row->GetCFAValue().IncOffset(amount);
> +
> + UnwindPlan::RowSP new_row(new UnwindPlan::Row(*row));
> + unwind_plan.InsertRow(new_row);
> + unwind_plan_updated = true;
> + continue;
> + }
> +
> + // lea %rsp, [%rsp + $offset]
> + if (lea_rsp_pattern_p(amount)) {
> + row->SetOffset(offset);
> + row->GetCFAValue().IncOffset(-amount);
> +
> + UnwindPlan::RowSP new_row(new UnwindPlan::Row(*row));
> + unwind_plan.InsertRow(new_row);
> + unwind_plan_updated = true;
> + continue;
> + }
> +
> + if (ret_pattern_p()) {
> + reinstate_unwind_state = true;
> + continue;
> + }
> + } else if (cfa_reg == m_lldb_fp_regnum) {
> + // CFA register is fp.
> +
> + // The only case we care about is epilogue:
> + // [0x5d] pop %rbp/%ebp
> + // => [0xc3] ret
> + if (pop_rbp_pattern_p() || leave_pattern_p()) {
> + // FIXME m_cur_insn should probably be updated -- I
> + // think it's not advanced here because this should be
> + // the last instruction in a function, assuming no
> + // mid-function epilogues...
> + if (ret_pattern_p()) {
> + row->SetOffset(offset);
> + row->GetCFAValue().SetIsRegisterPlusOffset(
> + first_row->GetCFAValue().GetRegisterNumber(), m_wordsize);
> +
> + UnwindPlan::RowSP new_row(new UnwindPlan::Row(*row));
> + unwind_plan.InsertRow(new_row);
> + unwind_plan_updated = true;
> + reinstate_unwind_state = true;
> + continue;
> + }
> + }
> + } else {
> + // CFA register is not sp or fp.
> +
> + // This must be hand-written assembly.
> + // Just trust eh_frame and assume we have finished.
> + break;
> + }
> + }
> +
> + unwind_plan.SetPlanValidAddressRange(func_range);
> + if (unwind_plan_updated) {
> + std::string unwind_plan_source(unwind_plan.GetSourceName().AsCString());
> + unwind_plan_source += " plus augmentation from assembly parsing";
> + unwind_plan.SetSourceName(unwind_plan_source.c_str());
> + unwind_plan.SetSourcedFromCompiler(eLazyBoolNo);
> + unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolYes);
> + }
> + return true;
> +}
> +
> +bool x86AssemblyInspectionEngine::FindFirstNonPrologueInstruction(
> + uint8_t *data, size_t size, size_t &offset) {
> + offset = 0;
> +
> + if (m_register_map_initialized == false)
> + return false;
> +
> + while (offset < size) {
> + int regno;
> + int insn_len;
> + int scratch;
> +
> + m_cur_insn = data + offset;
> + if (!instruction_length(m_cur_insn, insn_len) ||
> + insn_len > kMaxInstructionByteSize || insn_len == 0) {
> + // An error parsing the instruction, i.e. probably data/garbage - stop
> + // scanning
> + break;
> + }
> +
> + if (push_rbp_pattern_p() || mov_rsp_rbp_pattern_p() ||
> + sub_rsp_pattern_p(scratch) || push_reg_p(regno) ||
> + mov_reg_to_local_stack_frame_p(regno, scratch) ||
> + (lea_rsp_pattern_p(scratch) && offset == 0)) {
> + offset += insn_len;
> + continue;
> + }
> + //
> + // Unknown non-prologue instruction - stop scanning
> + break;
> + }
> +
> + return true;
> +}
>
> Added: lldb/trunk/source/Plugins/UnwindAssembly/x86/x86AssemblyInspectionEngine.h
> URL: http://llvm.org/viewvc/llvm-project/lldb/trunk/source/Plugins/UnwindAssembly/x86/x86AssemblyInspectionEngine.h?rev=282565&view=auto
> ==============================================================================
> --- lldb/trunk/source/Plugins/UnwindAssembly/x86/x86AssemblyInspectionEngine.h (added)
> +++ lldb/trunk/source/Plugins/UnwindAssembly/x86/x86AssemblyInspectionEngine.h Tue Sep 27 21:52:19 2016
> @@ -0,0 +1,178 @@
> +//===-- x86AssemblyInspectionEngine.h ---------------------------*- C++ -*-===//
> +//
> +// The LLVM Compiler Infrastructure
> +//
> +// This file is distributed under the University of Illinois Open Source
> +// License. See LICENSE.TXT for details.
> +//
> +//===----------------------------------------------------------------------===//
> +
> +#ifndef liblldb_x86AssemblyInspectionEngine_h_
> +#define liblldb_x86AssemblyInspectionEngine_h_
> +
> +#include "llvm-c/Disassembler.h"
> +
> +#include "lldb/lldb-enumerations.h"
> +#include "lldb/lldb-forward.h"
> +#include "lldb/lldb-private.h"
> +
> +#include "lldb/Core/ArchSpec.h"
> +#include "lldb/Core/ConstString.h"
> +
> +#include <map>
> +#include <vector>
> +
> +namespace lldb_private {
> +
> +// x86AssemblyInspectionEngine - a class which will take a buffer of bytes
> +// of i386/x86_64 instructions and create an UnwindPlan based on those
> +// assembly instructions.
> +class x86AssemblyInspectionEngine {
> +
> +public:
> + /// default ctor
> + x86AssemblyInspectionEngine(const lldb_private::ArchSpec &arch);
> +
> + /// default dtor
> + ~x86AssemblyInspectionEngine();
> +
> + /// One of the two initialize methods that can be called on this object;
> + /// they must be called before any of the assembly inspection methods
> + /// are called. This one should be used if the caller has access to a
> + /// valid RegisterContext.
> + void Initialize(lldb::RegisterContextSP ®_ctx);
> +
> + /// One of the two initialize methods that can be called on this object;
> + /// they must be called before any of the assembly inspection methods
> + /// are called. This one takes a vector of register name and lldb
> + /// register numbers.
> + struct lldb_reg_info {
> + const char *name;
> + uint32_t lldb_regnum;
> + lldb_reg_info() : name(nullptr), lldb_regnum(LLDB_INVALID_REGNUM) {}
> + };
> + void Initialize(std::vector<lldb_reg_info> ®_info);
> +
> + /// Create an UnwindPlan for a "non-call site" stack frame situation.
> + /// This is usually when this function/method is currently executing, and may
> + /// be at
> + /// a location where exception-handling style unwind information (eh_frame,
> + /// compact unwind info, arm unwind info)
> + /// are not valid.
> + /// \p data is a pointer to the instructions for the function
> + /// \p size is the size of the instruction buffer above
> + /// \p func_range is the start Address and size of the function, to be
> + /// included in the UnwindPlan
> + /// \p unwind_plan is the unwind plan that this method creates
> + /// \returns true if it was able to create an UnwindPlan; false if not.
> + bool
> + GetNonCallSiteUnwindPlanFromAssembly(uint8_t *data, size_t size,
> + lldb_private::AddressRange &func_range,
> + lldb_private::UnwindPlan &unwind_plan);
> +
> + /// Take an existing UnwindPlan, probably from eh_frame which may be missing
> + /// descriptio...
>
> [Message clipped]
>
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