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Reuse x86 GC and unwinding code in NativeAOT (dotnet#99109)
* Verbatim code extraction from eetwain.cpp into gc_unwind_x86.inl * Reuse x86 GC and unwinding code in NativeAOT Extracts x86 unwinding code and EnumGCRefs from eetwain.h/cpp into gc_unwind_x86.h/inl files. The bulk of the code remains unchanged with the methods UnwindStackFrameX86 and EnumGcRefsX86 extracted from the original EECodeManager methods. CoffNativeCodeManager includes all the x86 GC decoders and includes gc_unwind_x86.inl for TARGET_X86. Missing methods are implemented in terms of UnwindStackFrameX86, EnumGcRefsX86, and DecodeGCHdrInfo. Funclet calling assembly helpers are fixed up to follow the same pattern as on other platform. * Remove assert
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| Original file line number | Diff line number | Diff line change |
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| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
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| #ifndef _UNWIND_X86_H | ||
| #define _UNWIND_X86_H | ||
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| // This file is shared between CoreCLR and NativeAOT. Some of the differences are handled | ||
| // with the FEATURE_NATIVEAOT and FEATURE_EH_FUNCLETS defines. There are three main methods | ||
| // that are used by both runtimes - DecodeGCHdrInfo, UnwindStackFrameX86, and EnumGcRefsX86. | ||
| // | ||
| // The IN_EH_FUNCLETS and IN_EH_FUNCLETS_COMMA macros are used to specify some parameters | ||
| // for the above methods that are specific for a certain runtime or configuration. | ||
| #ifdef FEATURE_EH_FUNCLETS | ||
| #define IN_EH_FUNCLETS(a) a | ||
| #define IN_EH_FUNCLETS_COMMA(a) a, | ||
| #else | ||
| #define IN_EH_FUNCLETS(a) | ||
| #define IN_EH_FUNCLETS_COMMA(a) | ||
| #endif | ||
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| enum regNum | ||
| { | ||
| REGI_EAX, REGI_ECX, REGI_EDX, REGI_EBX, | ||
| REGI_ESP, REGI_EBP, REGI_ESI, REGI_EDI, | ||
| REGI_COUNT, | ||
| REGI_NA = REGI_COUNT | ||
| }; | ||
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| /***************************************************************************** | ||
| Register masks | ||
| */ | ||
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| enum RegMask | ||
| { | ||
| RM_EAX = 0x01, | ||
| RM_ECX = 0x02, | ||
| RM_EDX = 0x04, | ||
| RM_EBX = 0x08, | ||
| RM_ESP = 0x10, | ||
| RM_EBP = 0x20, | ||
| RM_ESI = 0x40, | ||
| RM_EDI = 0x80, | ||
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| RM_NONE = 0x00, | ||
| RM_ALL = (RM_EAX|RM_ECX|RM_EDX|RM_EBX|RM_ESP|RM_EBP|RM_ESI|RM_EDI), | ||
| RM_CALLEE_SAVED = (RM_EBP|RM_EBX|RM_ESI|RM_EDI), | ||
| RM_CALLEE_TRASHED = (RM_ALL & ~RM_CALLEE_SAVED), | ||
| }; | ||
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| /***************************************************************************** | ||
| * | ||
| * Helper to extract basic info from a method info block. | ||
| */ | ||
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| struct hdrInfo | ||
| { | ||
| unsigned int methodSize; // native code bytes | ||
| unsigned int argSize; // in bytes | ||
| unsigned int stackSize; // including callee saved registers | ||
| unsigned int rawStkSize; // excluding callee saved registers | ||
| ReturnKind returnKind; // The ReturnKind for this method. | ||
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| unsigned int prologSize; | ||
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| // Size of the epilogs in the method. | ||
| // For methods which use CEE_JMP, some epilogs may end with a "ret" instruction | ||
| // and some may end with a "jmp". The epilogSize reported should be for the | ||
| // epilog with the smallest size. | ||
| unsigned int epilogSize; | ||
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| unsigned char epilogCnt; | ||
| bool epilogEnd; // is the epilog at the end of the method | ||
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| bool ebpFrame; // locals and arguments addressed relative to EBP | ||
| bool doubleAlign; // is the stack double-aligned? locals addressed relative to ESP, and arguments relative to EBP | ||
| bool interruptible; // intr. at all times (excluding prolog/epilog), not just call sites | ||
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| bool handlers; // has callable handlers | ||
| bool localloc; // uses localloc | ||
| bool editNcontinue; // has been compiled in EnC mode | ||
| bool varargs; // is this a varargs routine | ||
| bool profCallbacks; // does the method have Enter-Leave callbacks | ||
| bool genericsContext;// has a reported generic context parameter | ||
| bool genericsContextIsMethodDesc;// reported generic context parameter is methoddesc | ||
| bool isSpeculativeStackWalk; // is the stackwalk seeded by an untrusted source (e.g., sampling profiler)? | ||
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| // These always includes EBP for EBP-frames and double-aligned-frames | ||
| RegMask savedRegMask:8; // which callee-saved regs are saved on stack | ||
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| // Count of the callee-saved registers, excluding the frame pointer. | ||
| // This does not include EBP for EBP-frames and double-aligned-frames. | ||
| unsigned int savedRegsCountExclFP; | ||
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| unsigned int untrackedCnt; | ||
| unsigned int varPtrTableSize; | ||
| unsigned int argTabOffset; // INVALID_ARGTAB_OFFSET if argtab must be reached by stepping through ptr tables | ||
| unsigned int gsCookieOffset; // INVALID_GS_COOKIE_OFFSET if there is no GuardStack cookie | ||
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| unsigned int syncStartOffset; // start/end code offset of the protected region in synchronized methods. | ||
| unsigned int syncEndOffset; // INVALID_SYNC_OFFSET if there not synchronized method | ||
| unsigned int syncEpilogStart; // The start of the epilog. Synchronized methods are guaranteed to have no more than one epilog. | ||
| unsigned int revPInvokeOffset; // INVALID_REV_PINVOKE_OFFSET if there is no Reverse PInvoke frame | ||
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| enum { NOT_IN_PROLOG = -1, NOT_IN_EPILOG = -1 }; | ||
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| int prologOffs; // NOT_IN_PROLOG if not in prolog | ||
| int epilogOffs; // NOT_IN_EPILOG if not in epilog. It is never 0 | ||
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| // | ||
| // Results passed back from scanArgRegTable | ||
| // | ||
| regNum thisPtrResult; // register holding "this" | ||
| RegMask regMaskResult; // registers currently holding GC ptrs | ||
| RegMask iregMaskResult; // iptr qualifier for regMaskResult | ||
| unsigned argHnumResult; | ||
| PTR_CBYTE argTabResult; // Table of encoded offsets of pending ptr args | ||
| unsigned argTabBytes; // Number of bytes in argTabResult[] | ||
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| // These next two are now large structs (i.e 132 bytes each) | ||
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| ptrArgTP argMaskResult; // pending arguments mask | ||
| ptrArgTP iargMaskResult; // iptr qualifier for argMaskResult | ||
| }; | ||
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| bool UnwindStackFrameX86(PREGDISPLAY pContext, | ||
| PTR_CBYTE methodStart, | ||
| DWORD curOffs, | ||
| hdrInfo * info, | ||
| PTR_CBYTE table, | ||
| IN_EH_FUNCLETS_COMMA(PTR_CBYTE funcletStart) | ||
| IN_EH_FUNCLETS_COMMA(bool isFunclet) | ||
| bool updateAllRegs); | ||
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| size_t DecodeGCHdrInfo(GCInfoToken gcInfoToken, | ||
| unsigned curOffset, | ||
| hdrInfo * infoPtr); | ||
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| #endif // _UNWIND_X86_H |
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