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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.
// See the LICENSE file in the project root for more information.
/*****************************************************************************/
#ifndef _GCINFO_H_
#define _GCINFO_H_
/*****************************************************************************/
// Keep definitions in this file in sync with Nutc\UTC\gcinfo.h
#ifdef _TARGET_ARM_
#define NUM_PRESERVED_REGS 9
enum RegMask
{
RBM_R0 = 0x0001,
RBM_R1 = 0x0002,
RBM_R2 = 0x0004,
RBM_R3 = 0x0008,
RBM_R4 = 0x0010, // callee saved
RBM_R5 = 0x0020, // callee saved
RBM_R6 = 0x0040, // callee saved
RBM_R7 = 0x0080, // callee saved
RBM_R8 = 0x0100, // callee saved
RBM_R9 = 0x0200, // callee saved
RBM_R10 = 0x0400, // callee saved
RBM_R11 = 0x0800, // callee saved
RBM_R12 = 0x1000,
RBM_SP = 0x2000,
RBM_LR = 0x4000, // callee saved, but not valid to be alive across a call!
RBM_PC = 0x8000,
RBM_RETVAL = RBM_R0,
RBM_CALLEE_SAVED_REGS = (RBM_R4|RBM_R5|RBM_R6|RBM_R7|RBM_R8|RBM_R9|RBM_R10|RBM_R11|RBM_LR),
RBM_CALLEE_SAVED_REG_COUNT = 9,
// Special case: LR is callee saved, but may not appear as a live GC ref except
// in the leaf frame because calls will trash it. Therefore, we ALSO consider
// it a scratch register.
RBM_SCRATCH_REGS = (RBM_R0|RBM_R1|RBM_R2|RBM_R3|RBM_R12|RBM_LR),
RBM_SCRATCH_REG_COUNT = 6,
};
enum RegNumber
{
RN_R0 = 0,
RN_R1 = 1,
RN_R2 = 2,
RN_R3 = 3,
RN_R4 = 4,
RN_R5 = 5,
RN_R6 = 6,
RN_R7 = 7,
RN_R8 = 8,
RN_R9 = 9,
RN_R10 = 10,
RN_R11 = 11,
RN_R12 = 12,
RN_SP = 13,
RN_LR = 14,
RN_PC = 15,
RN_NONE = 16,
};
enum CalleeSavedRegNum
{
CSR_NUM_R4 = 0x00,
CSR_NUM_R5 = 0x01,
CSR_NUM_R6 = 0x02,
CSR_NUM_R7 = 0x03,
CSR_NUM_R8 = 0x04,
CSR_NUM_R9 = 0x05,
CSR_NUM_R10 = 0x06,
CSR_NUM_R11 = 0x07,
// NOTE: LR is omitted because it may not be live except as a 'scratch' reg
};
enum CalleeSavedRegMask
{
CSR_MASK_NONE = 0x00,
CSR_MASK_R4 = 0x001,
CSR_MASK_R5 = 0x002,
CSR_MASK_R6 = 0x004,
CSR_MASK_R7 = 0x008,
CSR_MASK_R8 = 0x010,
CSR_MASK_R9 = 0x020,
CSR_MASK_R10 = 0x040,
CSR_MASK_R11 = 0x080,
CSR_MASK_LR = 0x100,
CSR_MASK_ALL = 0x1ff,
CSR_MASK_HIGHEST = 0x100,
};
enum ScratchRegNum
{
SR_NUM_R0 = 0x00,
SR_NUM_R1 = 0x01,
SR_NUM_R2 = 0x02,
SR_NUM_R3 = 0x03,
SR_NUM_R12 = 0x04,
SR_NUM_LR = 0x05,
};
enum ScratchRegMask
{
SR_MASK_NONE = 0x00,
SR_MASK_R0 = 0x01,
SR_MASK_R1 = 0x02,
SR_MASK_R2 = 0x04,
SR_MASK_R3 = 0x08,
SR_MASK_R12 = 0x10,
SR_MASK_LR = 0x20,
};
#elif defined(_TARGET_ARM64_)
enum RegMask
{
RBM_NONE = 0,
RBM_X0 = 0x00000001,
RBM_X1 = 0x00000002,
RBM_X2 = 0x00000004,
RBM_X3 = 0x00000008,
RBM_X4 = 0x00000010,
RBM_X5 = 0x00000020,
RBM_X6 = 0x00000040,
RBM_X7 = 0x00000080,
RBM_X8 = 0x00000100, // ARM64TODO: ARM64 ABI: indirect result register
RBM_X9 = 0x00000200,
RBM_X10 = 0x00000400,
RBM_X11 = 0x00000800,
RBM_X12 = 0x00001000,
RBM_X13 = 0x00002000,
RBM_X14 = 0x00004000,
RBM_X15 = 0x00008000,
RBM_XIP0 = 0x00010000, // This one is occasionally used as a scratch register (but can be destroyed by branching or a call)
RBM_XIP1 = 0x00020000, // This one may be also used as a scratch register (but can be destroyed by branching or a call)
RBM_XPR = 0x00040000,
RBM_X19 = 0x00080000, // RA_CALLEESAVE
RBM_X20 = 0x00100000, // RA_CALLEESAVE
RBM_X21 = 0x00200000, // RA_CALLEESAVE
RBM_X22 = 0x00400000, // RA_CALLEESAVE
RBM_X23 = 0x00800000, // RA_CALLEESAVE
RBM_X24 = 0x01000000, // RA_CALLEESAVE
RBM_X25 = 0x02000000, // RA_CALLEESAVE
RBM_X26 = 0x04000000, // RA_CALLEESAVE
RBM_X27 = 0x08000000, // RA_CALLEESAVE
RBM_X28 = 0x10000000, // RA_CALLEESAVE
RBM_FP = 0x20000000,
RBM_LR = 0x40000000,
RBM_SP = 0x80000000,
RBM_RETVAL = RBM_X8,
// Note: Callee saved regs: X19-X28; FP and LR are treated as callee-saved in unwinding code
RBM_CALLEE_SAVED_REG_COUNT = 12,
// Scratch regs: X0-X15, XIP0, XIP1, LR
RBM_SCRATCH_REG_COUNT = 19,
};
#define NUM_PRESERVED_REGS RBM_CALLEE_SAVED_REG_COUNT
// Number of the callee-saved registers stored in the fixed header
#define NUM_PRESERVED_REGS_LOW 9
#define MASK_PRESERVED_REGS_LOW ((1 << NUM_PRESERVED_REGS_LOW) - 1)
enum RegNumber
{
RN_X0 = 0,
RN_X1 = 1,
RN_X2 = 2,
RN_X3 = 3,
RN_X4 = 4,
RN_X5 = 5,
RN_X6 = 6,
RN_X7 = 7,
RN_X8 = 8, // indirect result register
RN_X9 = 9,
RN_X10 = 10,
RN_X11 = 11,
RN_X12 = 12,
RN_X13 = 13,
RN_X14 = 14,
RN_X15 = 15,
RN_XIP0 = 16,
RN_XIP1 = 17,
RN_XPR = 18,
RN_X19 = 19, // RA_CALLEESAVE
RN_X20 = 20, // RA_CALLEESAVE
RN_X21 = 21, // RA_CALLEESAVE
RN_X22 = 22, // RA_CALLEESAVE
RN_X23 = 23, // RA_CALLEESAVE
RN_X24 = 24, // RA_CALLEESAVE
RN_X25 = 25, // RA_CALLEESAVE
RN_X26 = 26, // RA_CALLEESAVE
RN_X27 = 27, // RA_CALLEESAVE
RN_X28 = 28, // RA_CALLEESAVE
RN_FP = 29,
RN_LR = 30,
RN_SP = 31,
RN_NONE = 32,
};
enum CalleeSavedRegNum
{
// NOTE: LR is omitted because it may not be live except as a 'scratch' reg
CSR_NUM_X19 = 1,
CSR_NUM_X20 = 2,
CSR_NUM_X21 = 3,
CSR_NUM_X22 = 4,
CSR_NUM_X23 = 5,
CSR_NUM_X24 = 6,
CSR_NUM_X25 = 7,
CSR_NUM_X26 = 8,
CSR_NUM_X27 = 9,
CSR_NUM_X28 = 10,
CSR_NUM_FP = 11,
CSR_NUM_NONE = 12,
};
enum CalleeSavedRegMask
{
CSR_MASK_NONE = 0x00,
// LR is placed here to reduce the frequency of the long encoding
CSR_MASK_LR = 0x001,
CSR_MASK_X19 = 0x002,
CSR_MASK_X20 = 0x004,
CSR_MASK_X21 = 0x008,
CSR_MASK_X22 = 0x010,
CSR_MASK_X23 = 0x020,
CSR_MASK_X24 = 0x040,
CSR_MASK_X25 = 0x080,
CSR_MASK_X26 = 0x100,
CSR_MASK_X27 = 0x200,
CSR_MASK_X28 = 0x400,
CSR_MASK_FP = 0x800,
CSR_MASK_ALL = 0xfff,
CSR_MASK_HIGHEST = 0x800,
};
enum ScratchRegNum
{
SR_NUM_X0 = 0,
SR_NUM_X1 = 1,
SR_NUM_X2 = 2,
SR_NUM_X3 = 3,
SR_NUM_X4 = 4,
SR_NUM_X5 = 5,
SR_NUM_X6 = 6,
SR_NUM_X7 = 7,
SR_NUM_X8 = 8,
SR_NUM_X9 = 9,
SR_NUM_X10 = 10,
SR_NUM_X11 = 11,
SR_NUM_X12 = 12,
SR_NUM_X13 = 13,
SR_NUM_X14 = 14,
SR_NUM_X15 = 15,
SR_NUM_XIP0 = 16,
SR_NUM_XIP1 = 17,
SR_NUM_LR = 18,
SR_NUM_NONE = 19,
};
enum ScratchRegMask
{
SR_MASK_NONE = 0x00,
SR_MASK_X0 = 0x01,
SR_MASK_X1 = 0x02,
SR_MASK_X2 = 0x04,
SR_MASK_X3 = 0x08,
SR_MASK_X4 = 0x10,
SR_MASK_X5 = 0x20,
SR_MASK_X6 = 0x40,
SR_MASK_X7 = 0x80,
SR_MASK_X8 = 0x100,
SR_MASK_X9 = 0x200,
SR_MASK_X10 = 0x400,
SR_MASK_X11 = 0x800,
SR_MASK_X12 = 0x1000,
SR_MASK_X13 = 0x2000,
SR_MASK_X14 = 0x4000,
SR_MASK_X15 = 0x8000,
SR_MASK_XIP0 = 0x10000,
SR_MASK_XIP1 = 0x20000,
SR_MASK_LR = 0x40000,
};
#else // _TARGET_ARM_
#ifdef _TARGET_AMD64_
#define NUM_PRESERVED_REGS 8
#else
#define NUM_PRESERVED_REGS 4
#endif
enum RegMask
{
RBM_EAX = 0x0001,
RBM_ECX = 0x0002,
RBM_EDX = 0x0004,
RBM_EBX = 0x0008, // callee saved
RBM_ESP = 0x0010,
RBM_EBP = 0x0020, // callee saved
RBM_ESI = 0x0040, // callee saved
RBM_EDI = 0x0080, // callee saved
RBM_R8 = 0x0100,
RBM_R9 = 0x0200,
RBM_R10 = 0x0400,
RBM_R11 = 0x0800,
RBM_R12 = 0x1000, // callee saved
RBM_R13 = 0x2000, // callee saved
RBM_R14 = 0x4000, // callee saved
RBM_R15 = 0x8000, // callee saved
RBM_RETVAL = RBM_EAX,
#ifdef _TARGET_AMD64_
RBM_CALLEE_SAVED_REGS = (RBM_EDI|RBM_ESI|RBM_EBX|RBM_EBP|RBM_R12|RBM_R13|RBM_R14|RBM_R15),
RBM_CALLEE_SAVED_REG_COUNT = 8,
RBM_SCRATCH_REGS = (RBM_EAX|RBM_ECX|RBM_EDX|RBM_R8|RBM_R9|RBM_R10|RBM_R11),
RBM_SCRATCH_REG_COUNT = 7,
#else
RBM_CALLEE_SAVED_REGS = (RBM_EDI|RBM_ESI|RBM_EBX|RBM_EBP),
RBM_CALLEE_SAVED_REG_COUNT = 4,
RBM_SCRATCH_REGS = (RBM_EAX|RBM_ECX|RBM_EDX),
RBM_SCRATCH_REG_COUNT = 3,
#endif // _TARGET_AMD64_
};
enum RegNumber
{
RN_EAX = 0,
RN_ECX = 1,
RN_EDX = 2,
RN_EBX = 3,
RN_ESP = 4,
RN_EBP = 5,
RN_ESI = 6,
RN_EDI = 7,
RN_R8 = 8,
RN_R9 = 9,
RN_R10 = 10,
RN_R11 = 11,
RN_R12 = 12,
RN_R13 = 13,
RN_R14 = 14,
RN_R15 = 15,
RN_NONE = 16,
};
enum CalleeSavedRegNum
{
CSR_NUM_RBX = 0x00,
CSR_NUM_RSI = 0x01,
CSR_NUM_RDI = 0x02,
CSR_NUM_RBP = 0x03,
#ifdef _TARGET_AMD64_
CSR_NUM_R12 = 0x04,
CSR_NUM_R13 = 0x05,
CSR_NUM_R14 = 0x06,
CSR_NUM_R15 = 0x07,
#endif // _TARGET_AMD64_
};
enum CalleeSavedRegMask
{
CSR_MASK_NONE = 0x00,
CSR_MASK_RBX = 0x01,
CSR_MASK_RSI = 0x02,
CSR_MASK_RDI = 0x04,
CSR_MASK_RBP = 0x08,
CSR_MASK_R12 = 0x10,
CSR_MASK_R13 = 0x20,
CSR_MASK_R14 = 0x40,
CSR_MASK_R15 = 0x80,
#ifdef _TARGET_AMD64_
CSR_MASK_ALL = 0xFF,
CSR_MASK_HIGHEST = 0x80,
#else
CSR_MASK_ALL = 0x0F,
CSR_MASK_HIGHEST = 0x08,
#endif
};
enum ScratchRegNum
{
SR_NUM_RAX = 0x00,
SR_NUM_RCX = 0x01,
SR_NUM_RDX = 0x02,
#ifdef _TARGET_AMD64_
SR_NUM_R8 = 0x03,
SR_NUM_R9 = 0x04,
SR_NUM_R10 = 0x05,
SR_NUM_R11 = 0x06,
#endif // _TARGET_AMD64_
};
enum ScratchRegMask
{
SR_MASK_NONE = 0x00,
SR_MASK_RAX = 0x01,
SR_MASK_RCX = 0x02,
SR_MASK_RDX = 0x04,
SR_MASK_R8 = 0x08,
SR_MASK_R9 = 0x10,
SR_MASK_R10 = 0x20,
SR_MASK_R11 = 0x40,
};
#endif // _TARGET_ARM_
struct GCInfoHeader
{
private:
UInt16 prologSize : 6; // 0 [0:5] // @TODO: define an 'overflow' encoding for big prologs?
UInt16 hasFunclets : 1; // 0 [6]
UInt16 fixedEpilogSize : 6; // 0 [7] + 1 [0:4] '0' encoding implies that epilog size varies and is encoded for each epilog
UInt16 epilogCountSmall : 2; // 1 [5:6] '3' encoding implies the number of epilogs is encoded separately
UInt16 hasExtraData : 1; // 1 [7] 1: more data follows (dynamic alignment, GS cookie, common vars, etc.)
#ifdef _TARGET_ARM_
UInt16 returnKind : 2; // 2 [0:1] one of: MethodReturnKind enum
UInt16 ebpFrame : 1; // 2 [2] on x64, this means "has frame pointer and it is RBP", on ARM R7
UInt16 epilogAtEnd : 1; // 2 [3]
UInt16 hasFrameSize : 1; // 2 [4] 1: frame size is encoded below, 0: frame size is 0
UInt16 calleeSavedRegMask : NUM_PRESERVED_REGS; // 2 [5:7] 3 [0:5]
UInt16 arm_areParmOrVfpRegsPushed:1; // 3 [6] 1: pushed param reg set (R0-R3) and pushed fp reg start and count are encoded below, 0: no pushed param or fp registers
#elif defined (_TARGET_ARM64_)
UInt16 returnKind : 2; // 2 [0:1] one of: MethodReturnKind enum
UInt16 ebpFrame : 1; // 2 [2] 1: has frame pointer and it is FP
UInt16 epilogAtEnd : 1; // 2 [3]
UInt16 hasFrameSize : 1; // 2 [4] 1: frame size is encoded below, 0: frame size is 0
UInt16 arm64_longCsrMask : 1; // 2 [5] 1: high bits of calleeSavedRegMask are encoded below
UInt16 arm64_areParmOrVfpRegsPushed : 1; // 2 [6] 1: pushed param reg count (X0-X7) and pushed fp reg set (D8-D15) are encoded below, 0: no pushed param or fp registers
UInt16 arm64_calleeSavedRegMaskLow : NUM_PRESERVED_REGS_LOW; // 2 [7] 3 [0:7]
#else
UInt8 returnKind : 2; // 2 [0:1] one of: MethodReturnKind enum
UInt8 ebpFrame : 1; // 2 [2] on x64, this means "has frame pointer and it is RBP", on ARM R7
UInt8 epilogAtEnd : 1; // 2 [3]
#ifdef _TARGET_AMD64_
UInt8 hasFrameSize : 1; // 2 [4] 1: frame size is encoded below, 0: frame size is 0
UInt8 x64_framePtrOffsetSmall : 2; // 2 [5:6] 00: framePtrOffset = 0x20
// 01: framePtrOffset = 0x30
// 10: framePtrOffset = 0x40
// 11: a variable-length integer 'x64_frameOffset' follows.
UInt8 x64_hasSavedXmmRegs : 1; // 2 [7] any saved xmm registers?
#endif
// X86 X64
UInt8 calleeSavedRegMask : NUM_PRESERVED_REGS; // 2 [4:7] 3 [0:7]
#ifdef _TARGET_X86_
UInt8 x86_argCountLow : 5; // 3 [0-4] expressed in pointer-sized units // @TODO: steal more bits here?
UInt8 x86_argCountIsLarge : 1; // 3 [5] if this bit is set, then the high 8 bits are encoded in x86_argCountHigh
UInt8 x86_hasStackChanges : 1; // 3 [6] x86-only, !ebpFrame-only, this method has pushes
// and pops in it, and a string follows this header
// which describes them
UInt8 hasFrameSize : 1; // 3 [7] 1: frame size is encoded below, 0: frame size is 0
#endif
#endif
//
// OPTIONAL FIELDS FOLLOW
//
// The following values are encoded with variable-length integers on disk, but are decoded into these
// fields in memory.
//
// For ARM and ARM64 this field stores the offset of the callee-saved area relative to FP/SP
UInt32 frameSize; // expressed in pointer-sized units, only encoded if hasFrameSize==1
// OPTIONAL: only encoded if returnKind = MRK_ReturnsToNative
UInt32 reversePinvokeFrameOffset; // expressed in pointer-sized units away from the frame pointer
#ifdef _TARGET_AMD64_
// OPTIONAL: only encoded if x64_framePtrOffsetSmall = 11
//
// ENCODING NOTE: In the encoding, the variable-sized unsigned will be 7 less than the total number
// of 16-byte units that make up the frame pointer offset.
//
// In memory, this value will always be set and will always be the total number of 16-byte units that make
// up the frame pointer offset.
UInt8 x64_framePtrOffset; // expressed in 16-byte unit
// OPTIONAL: only encoded using a variable-sized unsigned if x64_hasSavedXmmRegs is set.
//
// An additional optimization is possible because registers xmm0 .. xmm5 should never be saved,
// so they are not encoded in the variable-sized unsigned - instead the mask is shifted right 6 bits
// for encoding. Thus, any subset of registers xmm6 .. xmm12 can be represented using one byte
// - this covers the most frequent cases.
//
// The shift applies to decoding/encoding only though - the actual header field below uses the
// straightforward mapping where bit 0 corresponds to xmm0, bit 1 corresponds to xmm1 and so on.
//
UInt16 x64_savedXmmRegMask; // which xmm regs were saved
#elif defined(_TARGET_X86_)
// OPTIONAL: only encoded if x86_argCountIsLarge = 1
// NOTE: because we are using pointer-sized units, only 14 bits are required to represent the entire range
// that can be expressed by a 'ret NNNN' instruction. Therefore, with 6 in the 'low' field and 8 in the
// 'high' field, we are not losing any range here. (Although the need for that full range is debatable.)
UInt8 x86_argCountHigh;
#elif defined(_TARGET_ARM_)
// OPTIONAL: only encoded if arm_areParmOrVfpRegsPushed = 1
UInt8 arm_parmRegsPushedSet;
UInt8 arm_vfpRegFirstPushed;
UInt8 arm_vfpRegPushedCount;
#elif defined(_TARGET_ARM64_)
// OPTIONAL: high bits of calleeSavedRegMask are encoded only if arm64_longCsrMask = 1; low bits equal to arm64_calleeSavedRegMaskLow
UInt16 calleeSavedRegMask;
// OPTIONAL: only encoded if arm64_areParmOrVfpRegsPushed = 1
UInt8 arm64_parmRegsPushedCount; // how many of X0-X7 registers are saved
UInt8 arm64_vfpRegsPushedMask; // which of D8-D15 registers are saved
#endif
//
// OPTIONAL: only encoded if hasExtraData = 1
union
{
struct
{
UInt8 logStackAlignment : 4; // [0:3] binary logarithm of frame alignment (3..15) or 0
UInt8 hasGSCookie : 1; // [4] 1: frame uses GS cookie
UInt8 hasCommonVars : 1; // [5] 1: method has a list of "common vars"
// as an optimization for methods with many call sites and variables
#if defined(_TARGET_ARM64_)
UInt8 FPLRAreOnTop : 1; // [6] 1: FP and LR are saved on top of locals, not at the bottom (see MdmSaveFPAndLRAtTopOfLocalsArea)
UInt8 extraDataUnused : 1; // [7] unused bits
#else
UInt8 extraDataUnused : 2; // [6:7] unused bits
#endif
#pragma warning(suppress:4201) // nameless struct
};
UInt8 extraDataHeader;
};
// OPTIONAL: only encoded if logStackAlignment != 0
UInt8 paramPointerReg;
// OPTIONAL: only encoded if epilogCountSmall = 3
UInt16 epilogCount;
// OPTIONAL: only encoded if gsCookie = 1
UInt32 gsCookieOffset; // expressed in pointer-sized units away from the frame pointer
//
// OPTIONAL: only encoded if hasFunclets = 1
// {numFunclets} // encoded as variable-length unsigned
// {start-funclet0} // offset from start of previous funclet, encoded as variable-length unsigned
// {start-funclet1} //
// {start-funclet2}
// ...
// {sizeof-funclet(N-1)} // numFunclets == N (i.e. there are N+1 sizes here)
// -----------------
// {GCInfoHeader-funclet0} // encoded as normal, must not have 'hasFunclets' set.
// {GCInfoHeader-funclet1}
// ...
// {GCInfoHeader-funclet(N-1)}
// WARNING:
// WARNING: Do not add fields to the file-format after the funclet header encodings -- these are decoded
// WARNING: recursively and 'in-place' when looking for the info associated with a funclet. Therefore,
// WARNING: in that case, we cannot easily continue to decode things associated with the main body
// WARNING: GCInfoHeader once we start this recursive decode.
// WARNING:
// -------------------------------------------------------------------------------------------------------
// END of file-encoding-related-fields
// -------------------------------------------------------------------------------------------------------
// The following fields are not encoded in the file format, they are just used as convenience placeholders
// for decode state.
UInt32 funcletOffset; // non-zero indicates that this GCInfoHeader is for a funclet
#if defined(BINDER)
public:
UInt32 cbThisCodeBody;
GCInfoHeader * pNextFunclet;
private:
;
#endif // BINDER
public:
//
// CONSTANTS / STATIC STUFF
//
enum MethodReturnKind
{
MRK_ReturnsScalar = 0,
MRK_ReturnsObject = 1,
MRK_ReturnsByref = 2,
MRK_ReturnsToNative = 3,
MRK_Unknown = 4,
};
enum EncodingConstants
{
EC_SizeOfFixedHeader = 4,
EC_MaxFrameByteSize = 10*1024*1024,
EC_MaxReversePInvokeFrameByteOffset = 10*1024*1024,
EC_MaxX64FramePtrByteOffset = UInt16_MAX * 0x10,
EC_MaxEpilogCountSmall = 3,
EC_MaxEpilogCount = 64*1024 - 1,
};
//
// MEMBER FUNCTIONS
//
void Init()
{
memset(this, 0, sizeof(GCInfoHeader));
}
//
// SETTERS
//
void SetPrologSize(UInt32 sizeInBytes)
{
#if defined (_TARGET_ARM64_)
// For arm64 we encode multiples of 4, rather than raw bytes, since instructions are all same size.
ASSERT((sizeInBytes & 3) == 0);
prologSize = sizeInBytes >> 2;
ASSERT(prologSize == sizeInBytes >> 2);
#else
prologSize = sizeInBytes;
ASSERT(prologSize == sizeInBytes);
#endif
}
void SetHasFunclets(bool fHasFunclets)
{
hasFunclets = fHasFunclets ? 1 : 0;
}
void PokeFixedEpilogSize(UInt32 sizeInBytes)
{
#if defined (_TARGET_ARM64_)
// For arm64 we encode multiples of 4, rather than raw bytes, since instructions are all same size.
ASSERT((sizeInBytes & 3) == 0);
fixedEpilogSize = sizeInBytes >> 2;
ASSERT(fixedEpilogSize == sizeInBytes >> 2);
#else
fixedEpilogSize = sizeInBytes;
ASSERT(fixedEpilogSize == sizeInBytes);
#endif
}
void SetFixedEpilogSize(UInt32 sizeInBytes, bool varyingSizes)
{
if (varyingSizes)
fixedEpilogSize = 0;
else
{
ASSERT(sizeInBytes != 0);
PokeFixedEpilogSize(sizeInBytes);
}
}
void SetEpilogCount(UInt32 count, bool isAtEnd)
{
epilogCount = ToUInt16(count);
epilogAtEnd = isAtEnd ? 1 : 0;
ASSERT(epilogCount == count);
ASSERT((count == 1) || !isAtEnd);
epilogCountSmall = count < EC_MaxEpilogCountSmall ? count : EC_MaxEpilogCountSmall;
}
void SetReturnKind(MethodReturnKind kind)
{
ASSERT(kind < MRK_Unknown); // not enough bits to encode 'unknown'
returnKind = kind;
}
void SetDynamicAlignment(UInt8 logByteAlignment)
{
#ifdef _TARGET_X86_
ASSERT(logByteAlignment >= 3); // 4 byte aligned frames
#else
ASSERT(logByteAlignment >= 4); // 8 byte aligned frames
#endif
hasExtraData = 1;
logStackAlignment = logByteAlignment;
ASSERT(logStackAlignment == logByteAlignment);
paramPointerReg = RN_NONE;
}
#if defined(_TARGET_ARM64_)
void SetFPLROnTop(void)
{
hasExtraData = 1;
FPLRAreOnTop = 1;
}
#endif
void SetGSCookieOffset(UInt32 offsetInBytes)
{
ASSERT(offsetInBytes != 0);
ASSERT(0 == (offsetInBytes % POINTER_SIZE));
hasExtraData = 1;
hasGSCookie = 1;
gsCookieOffset = offsetInBytes / POINTER_SIZE;
}
void SetHasCommonVars()
{
hasExtraData = 1;
hasCommonVars = 1;
}
void SetParamPointer(RegNumber regNum, UInt32 offsetInBytes, bool isOffsetFromSP = false)
{
UNREFERENCED_PARAMETER(offsetInBytes);
UNREFERENCED_PARAMETER(isOffsetFromSP);
ASSERT(HasDynamicAlignment()); // only expected for dynamic aligned frames
ASSERT(offsetInBytes==0); // not yet supported
paramPointerReg = (UInt8)regNum;
}
void SetFramePointer(RegNumber regNum, UInt32 offsetInBytes, bool isOffsetFromSP = false)
{
UNREFERENCED_PARAMETER(offsetInBytes);
UNREFERENCED_PARAMETER(isOffsetFromSP);
if (regNum == RN_NONE)
{
ebpFrame = 0;
}
else
{
#ifdef _TARGET_ARM_
ASSERT(regNum == RN_R7);
#elif defined(_TARGET_AMD64_) || defined(_TARGET_X86_)
ASSERT(regNum == RN_EBP);
#elif defined(_TARGET_ARM64_)
ASSERT(regNum == RN_FP);
#else
ASSERT(!"NYI");
#endif
ebpFrame = 1;
}
ASSERT(offsetInBytes == 0 || isOffsetFromSP);
#ifdef _TARGET_AMD64_
if (isOffsetFromSP)
offsetInBytes += SKEW_FOR_OFFSET_FROM_SP;
ASSERT((offsetInBytes % 0x10) == 0);
UInt32 offsetInSlots = offsetInBytes / 0x10;
if (offsetInSlots >= 3 && offsetInSlots <= 3 + 2)
{
x64_framePtrOffsetSmall = offsetInSlots - 3;
}
else
{
x64_framePtrOffsetSmall = 3;
}
x64_framePtrOffset = (UInt8)offsetInSlots;
ASSERT(x64_framePtrOffset == offsetInSlots);
#else
ASSERT(offsetInBytes == 0 && !isOffsetFromSP);
#endif // _TARGET_AMD64_
}
void SetFrameSize(UInt32 frameSizeInBytes)
{
ASSERT(0 == (frameSizeInBytes % POINTER_SIZE));
frameSize = (frameSizeInBytes / POINTER_SIZE);
ASSERT(frameSize == (frameSizeInBytes / POINTER_SIZE));
if (frameSize != 0)
{
hasFrameSize = 1;
}
}
void SetSavedRegs(CalleeSavedRegMask regMask)
{
calleeSavedRegMask = (UInt16)regMask;
}
void SetRegSaved(CalleeSavedRegMask regMask)
{
calleeSavedRegMask |= regMask;
}
void SetReversePinvokeFrameOffset(int offsetInBytes)
{
ASSERT(HasFramePointer());
ASSERT((offsetInBytes % POINTER_SIZE) == 0);
ASSERT(GetReturnKind() == MRK_ReturnsToNative);
#if defined(_TARGET_ARM_) || defined(_TARGET_AMD64_) || defined(_TARGET_ARM64_)
// The offset can be either positive or negative on ARM and x64.
bool isNeg = (offsetInBytes < 0);
UInt32 uOffsetInBytes = isNeg ? -offsetInBytes : offsetInBytes;
UInt32 uEncodedVal = ((uOffsetInBytes / POINTER_SIZE) << 1) | (isNeg ? 1 : 0);
reversePinvokeFrameOffset = uEncodedVal;
ASSERT(reversePinvokeFrameOffset == uEncodedVal);
#elif defined (_TARGET_X86_)
// Use a positive number because it encodes better and
// the offset is always negative on x86.
ASSERT(offsetInBytes < 0);
reversePinvokeFrameOffset = (-offsetInBytes / POINTER_SIZE);
ASSERT(reversePinvokeFrameOffset == (UInt32)(-offsetInBytes / POINTER_SIZE));
#else
ASSERT(!"NYI");
#endif
}
#ifdef _TARGET_X86_
void SetReturnPopSize(UInt32 popSizeInBytes)
{
ASSERT(0 == (popSizeInBytes % POINTER_SIZE));
ASSERT(GetReturnPopSize() == 0 || GetReturnPopSize() == (int)popSizeInBytes);
UInt32 argCount = popSizeInBytes / POINTER_SIZE;
x86_argCountLow = argCount & 0x1F;
if (argCount != x86_argCountLow)
{
x86_argCountIsLarge = 1;
x86_argCountHigh = (UInt8)(argCount >> 5);
}
}
void SetHasStackChanges()
{
x86_hasStackChanges = 1;
}
#endif // _TARGET_X86_
#ifdef _TARGET_ARM_
void SetParmRegsPushed(ScratchRegMask pushedParmRegs)
{
// should be a subset of {RO-R3}
ASSERT((pushedParmRegs & ~(SR_MASK_R0|SR_MASK_R1|SR_MASK_R2|SR_MASK_R3)) == 0);
arm_areParmOrVfpRegsPushed = pushedParmRegs != 0 || arm_vfpRegPushedCount != 0;
arm_parmRegsPushedSet = (UInt8)pushedParmRegs;
}
void SetVfpRegsPushed(UInt8 vfpRegFirstPushed, UInt8 vfpRegPushedCount)
{
// mrt100.dll really only supports pushing a subinterval of d8-d15
// these are the preserved floating point registers according to the ABI spec
ASSERT(8 <= vfpRegFirstPushed && vfpRegFirstPushed + vfpRegPushedCount <= 16 || vfpRegPushedCount == 0);
arm_vfpRegFirstPushed = vfpRegFirstPushed;
arm_vfpRegPushedCount = vfpRegPushedCount;
arm_areParmOrVfpRegsPushed = arm_parmRegsPushedSet != 0 || vfpRegPushedCount != 0;
}
#elif defined(_TARGET_ARM64_)
void SetParmRegsPushedCount(UInt8 parmRegsPushedCount)
{
// pushed parameter registers are a subset of {R0-R7}
ASSERT(parmRegsPushedCount <= 8);
arm64_parmRegsPushedCount = parmRegsPushedCount;
arm64_areParmOrVfpRegsPushed = (arm64_parmRegsPushedCount != 0) || (arm64_vfpRegsPushedMask != 0);
}
void SetVfpRegsPushed(UInt8 vfpRegsPushedMask)
{
arm64_vfpRegsPushedMask = vfpRegsPushedMask;
arm64_areParmOrVfpRegsPushed = (arm64_parmRegsPushedCount != 0) || (arm64_vfpRegsPushedMask != 0);
}
#elif defined(_TARGET_AMD64_)
void SetSavedXmmRegs(UInt32 savedXmmRegMask)
{
// any subset of xmm6-xmm15 may be saved, but no registers in xmm0-xmm5 should be present
ASSERT((savedXmmRegMask & 0xffff003f) == 0);
x64_hasSavedXmmRegs = savedXmmRegMask != 0;
x64_savedXmmRegMask = (UInt16)savedXmmRegMask;
}
#endif
void SetFuncletOffset(UInt32 offset)
{
funcletOffset = offset;
}
//
// GETTERS
//
UInt32 GetPrologSize()
{
#if defined (_TARGET_ARM64_)
return prologSize << 2;
#else
return prologSize;
#endif
}
bool HasFunclets()
{
return (hasFunclets != 0);
}
bool HasVaryingEpilogSizes()
{
return fixedEpilogSize == 0;
}
UInt32 PeekFixedEpilogSize()
{
#if defined (_TARGET_ARM64_)
return fixedEpilogSize << 2;
#else
return fixedEpilogSize;
#endif
}
UInt32 GetFixedEpilogSize()
{
ASSERT(!HasVaryingEpilogSizes());
return PeekFixedEpilogSize();
}
UInt32 GetEpilogCount()
{
return epilogCount;
}
bool IsEpilogAtEnd()
{
return (epilogAtEnd != 0);
}
MethodReturnKind GetReturnKind()
{
return (MethodReturnKind)returnKind;
}
bool ReturnsToNative()
{
return (GetReturnKind() == MRK_ReturnsToNative);
}
bool HasFramePointer()
{
return !!ebpFrame;
}
bool IsFunclet()
{
return funcletOffset != 0;
}
UInt32 GetFuncletOffset()
{
return funcletOffset;
}
int GetPreservedRegsSaveSize() const // returned in bytes
{
UInt32 count = 0;
UInt32 mask = calleeSavedRegMask;
while (mask != 0)
{
count += mask & 1;
mask >>= 1;
}
return count * POINTER_SIZE;
}
int GetParamPointerReg()
{
return paramPointerReg;
}
bool HasDynamicAlignment()
{
return !!logStackAlignment;
}
UInt32 GetDynamicAlignment()
{
return 1 << logStackAlignment;
}
bool HasGSCookie()
{
return hasGSCookie;
}
#if defined(_TARGET_ARM64_)
bool AreFPLROnTop()
{
return FPLRAreOnTop;
}
#endif
UInt32 GetGSCookieOffset()
{
ASSERT(hasGSCookie);
return gsCookieOffset * POINTER_SIZE;
}
bool HasCommonVars()
{
return hasCommonVars;
}
#if defined(RHDUMP) && !defined(_TARGET_AMD64_)
// Due to the wackiness of RhDump, we need this method defined, even though it won't ever be called.
int GetFramePointerOffset() { ASSERT(!"UNREACHABLE"); __assume(0); }
#endif // defined(RHDUMP) && !defined(_TARGET_AMD64_)
#ifdef _TARGET_AMD64_
static const UInt32 SKEW_FOR_OFFSET_FROM_SP = 0x10;
int GetFramePointerOffset() // returned in bytes
{
// traditional frames where FP points to the pushed FP have fp offset == 0
if (x64_framePtrOffset == 0)
return 0;
// otherwise it's an x64 style frame where the fp offset is measured from the sp
// at the end of the prolog
int offsetFromSP = GetFramePointerOffsetFromSP();
int preservedRegsSaveSize = GetPreservedRegsSaveSize();
// we when called from the binder, rbp isn't set to be a preserved reg,
// when called from the runtime, it is - compensate for this inconsistency
if (IsRegSaved(CSR_MASK_RBP))
preservedRegsSaveSize -= POINTER_SIZE;
return offsetFromSP - preservedRegsSaveSize - GetFrameSize();
}
bool IsFramePointerOffsetFromSP()
{
return x64_framePtrOffset != 0;
}
int GetFramePointerOffsetFromSP()
{
ASSERT(IsFramePointerOffsetFromSP());
int offsetFromSP;
offsetFromSP = x64_framePtrOffset * 0x10;
ASSERT(offsetFromSP >= SKEW_FOR_OFFSET_FROM_SP);
offsetFromSP -= SKEW_FOR_OFFSET_FROM_SP;
return offsetFromSP;
}
int GetFramePointerReg()
{
return RN_EBP;
}
bool HasSavedXmmRegs()
{
return x64_hasSavedXmmRegs != 0;
}
UInt16 GetSavedXmmRegMask()
{
ASSERT(x64_hasSavedXmmRegs);
return x64_savedXmmRegMask;
}
#elif defined(_TARGET_X86_)
int GetReturnPopSize() // returned in bytes
{
if (!x86_argCountIsLarge)
{
return x86_argCountLow * POINTER_SIZE;
}
return ((x86_argCountHigh << 5) | x86_argCountLow) * POINTER_SIZE;
}
bool HasStackChanges()
{
return !!x86_hasStackChanges;
}
#endif
int GetFrameSize()
{
return frameSize * POINTER_SIZE;
}
int GetReversePinvokeFrameOffset()
{
#if defined(_TARGET_ARM_) || defined(_TARGET_AMD64_) || defined(_TARGET_ARM64_)
// The offset can be either positive or negative on ARM.
Int32 offsetInBytes;
UInt32 uEncodedVal = reversePinvokeFrameOffset;
bool isNeg = ((uEncodedVal & 1) == 1);
offsetInBytes = (uEncodedVal >> 1) * POINTER_SIZE;
offsetInBytes = isNeg ? -offsetInBytes : offsetInBytes;
return offsetInBytes;
#elif defined(_TARGET_X86_)
// it's always at "EBP - something", so we encode it as a positive
// number and then apply the negative here.
int unsignedOffset = reversePinvokeFrameOffset * POINTER_SIZE;
return -unsignedOffset;
#else
ASSERT(!"NYI");
#endif
}
CalleeSavedRegMask GetSavedRegs()
{
return (CalleeSavedRegMask) calleeSavedRegMask;
}
bool IsRegSaved(CalleeSavedRegMask reg)
{
return (0 != (calleeSavedRegMask & reg));
}
#ifdef _TARGET_ARM_
bool AreParmRegsPushed()
{
return arm_parmRegsPushedSet != 0;
}
UInt16 ParmRegsPushedCount()
{
UInt8 set = arm_parmRegsPushedSet;
UInt8 count = 0;
while (set != 0)
{
count += set & 1;
set >>= 1;
}
return count;
}
UInt8 GetVfpRegFirstPushed()
{
return arm_vfpRegFirstPushed;
}
UInt8 GetVfpRegPushedCount()
{
return arm_vfpRegPushedCount;
}
#elif defined(_TARGET_ARM64_)
UInt8 ParmRegsPushedCount()
{
return arm64_parmRegsPushedCount;
}
UInt8 GetVfpRegsPushedMask()
{
return arm64_vfpRegsPushedMask;
}
#endif
//
// ENCODING HELPERS
//
#ifndef DACCESS_COMPILE
size_t EncodeHeader(UInt8 * & pDest)
{
#ifdef _DEBUG
UInt8 * pStart = pDest;
#endif // _DEBUG
#if defined(_TARGET_ARM64_)
UInt8 calleeSavedRegMaskHigh = calleeSavedRegMask >> NUM_PRESERVED_REGS_LOW;
arm64_calleeSavedRegMaskLow = calleeSavedRegMask & MASK_PRESERVED_REGS_LOW;
if (calleeSavedRegMaskHigh)
{
arm64_longCsrMask = 1;
}
#endif
size_t size = EC_SizeOfFixedHeader;
if (pDest)
{
memcpy(pDest, this, EC_SizeOfFixedHeader);
pDest += EC_SizeOfFixedHeader;
}
if (hasFrameSize)
size += WriteUnsigned(pDest, frameSize);
if (returnKind == MRK_ReturnsToNative)
size += WriteUnsigned(pDest, reversePinvokeFrameOffset);
#ifdef _TARGET_AMD64_
if (x64_framePtrOffsetSmall == 0x3)
size += WriteUnsigned(pDest, x64_framePtrOffset);
if (x64_hasSavedXmmRegs)
{
ASSERT((x64_savedXmmRegMask & 0x3f) == 0);
UInt32 encodedValue = x64_savedXmmRegMask >> 6;
size += WriteUnsigned(pDest, encodedValue);
}
#elif defined(_TARGET_X86_)
if (x86_argCountIsLarge)
{
size += 1;
if (pDest)
*pDest++ = x86_argCountHigh;
}
ASSERT(!x86_hasStackChanges || !"NYI -- stack changes for ESP frames");
#elif defined(_TARGET_ARM_)
if (arm_areParmOrVfpRegsPushed)
{
// we encode a bit field where the low 4 bits represent the pushed parameter register
// set, the next 8 bits are the number of pushed floating point registers, and the highest
// bits are the first pushed floating point register plus 1.
// The 0 encoding means the first floating point register is 8 as this is the most frequent.
UInt32 encodedValue = arm_parmRegsPushedSet | (arm_vfpRegPushedCount << 4);
// usually, the first pushed floating point register is d8
if (arm_vfpRegFirstPushed != 8)
encodedValue |= (arm_vfpRegFirstPushed+1) << (8+4);
size += WriteUnsigned(pDest, encodedValue);
}
#elif defined(_TARGET_ARM64_)
if (calleeSavedRegMaskHigh)
{
size += 1;
if (pDest)
*pDest++ = calleeSavedRegMaskHigh;
}
if (arm64_areParmOrVfpRegsPushed)
{
// At present arm64_parmRegsPushedCount is non-zero only for variadic functions, so place this field higher
UInt32 encodedValue = arm64_vfpRegsPushedMask | (arm64_parmRegsPushedCount << 8);
size += WriteUnsigned(pDest, encodedValue);
}
#endif
// encode dynamic alignment and GS cookie information
if (hasExtraData)
{
size += WriteUnsigned(pDest, extraDataHeader);
}
if (HasDynamicAlignment())
{
size += WriteUnsigned(pDest, paramPointerReg);
}
if (hasGSCookie)
{
size += WriteUnsigned(pDest, gsCookieOffset);
}
if (epilogCountSmall == EC_MaxEpilogCountSmall)
{
size += WriteUnsigned(pDest, epilogCount);
}
// WARNING:
// WARNING: Do not add fields to the file-format after the funclet header encodings -- these are
// WARNING: decoded recursively and 'in-place' when looking for the info associated with a funclet.
// WARNING: Therefore, in that case, we cannot easily continue to decode things associated with the
// WARNING: main body GCInfoHeader once we start this recursive decode.
// WARNING:
size += EncodeFuncletInfo(pDest);
#ifdef _DEBUG
ASSERT(!pDest || (size == (size_t)(pDest - pStart)));
#endif // _DEBUG
return size;
}
size_t WriteUnsigned(UInt8 * & pDest, UInt32 value)
{
size_t size = (size_t)VarInt::WriteUnsigned(pDest, value);
pDest = pDest ? (pDest + size) : pDest;
return size;
}
size_t EncodeFuncletInfo(UInt8 * & pDest)
{
UNREFERENCED_PARAMETER(pDest);
size_t size = 0;
#if defined(BINDER)
if (hasFunclets)
{
UInt32 nFunclets = 0;
for (GCInfoHeader * pCur = pNextFunclet; pCur != NULL; pCur = pCur->pNextFunclet)
nFunclets++;
// first write out the number of funclets
size += WriteUnsigned(pDest, nFunclets);
// cbThisCodeBody is the size, but what we end up encoding is the size of all the code bodies
// except for the last one (because the last one's size can be implicitly figured out by the size
// of the method). So we have to save the size of the 'main body' and not the size of the last
// funclet. In the encoding, this will look like the offset of a given funclet from the start of
// the previous code body. We like relative offsets because they'll encode to be smaller.
for (GCInfoHeader * pCur = this; pCur->pNextFunclet != NULL; pCur = pCur->pNextFunclet)
size += WriteUnsigned(pDest, pCur->cbThisCodeBody);
// now encode all the funclet headers
for (GCInfoHeader * pCur = pNextFunclet; pCur != NULL; pCur = pCur->pNextFunclet)
size += pCur->EncodeHeader(pDest);
}
#else // BINDER
ASSERT(!"NOT REACHABLE");
#endif // BINDER
return size;
}
#endif // DACCESS_COMPILE
UInt16 ToUInt16(UInt32 val)
{
UInt16 result = (UInt16)val;
ASSERT(val == result);
return result;
}
UInt8 ToUInt8(UInt32 val)
{
UInt8 result = (UInt8)val;
ASSERT(val == result);
return result;
}
//
// DECODING HELPERS
//
// Returns a pointer to the 'stack change string' on x86.
PTR_UInt8 DecodeHeader(UInt32 methodOffset, PTR_UInt8 pbHeaderEncoding, size_t* pcbHeader)
{
PTR_UInt8 pbStackChangeString = NULL;
TADDR pbTemp = PTR_TO_TADDR(pbHeaderEncoding);
memcpy(this, PTR_READ(pbTemp, EC_SizeOfFixedHeader), EC_SizeOfFixedHeader);
PTR_UInt8 pbDecode = pbHeaderEncoding + EC_SizeOfFixedHeader;
frameSize = hasFrameSize
? VarInt::ReadUnsigned(pbDecode)
: 0;
reversePinvokeFrameOffset = (returnKind == MRK_ReturnsToNative)
? VarInt::ReadUnsigned(pbDecode)
: 0;
#ifdef _TARGET_AMD64_
x64_framePtrOffset = (x64_framePtrOffsetSmall == 0x3)
? ToUInt8(VarInt::ReadUnsigned(pbDecode))
: x64_framePtrOffsetSmall + 3;
x64_savedXmmRegMask = 0;
if (x64_hasSavedXmmRegs)
{
UInt32 encodedValue = VarInt::ReadUnsigned(pbDecode);
ASSERT((encodedValue & ~0x3ff) == 0);
x64_savedXmmRegMask = ToUInt16(encodedValue << 6);
}
#elif defined(_TARGET_X86_)
if (x86_argCountIsLarge)
x86_argCountHigh = *pbDecode++;
else
x86_argCountHigh = 0;
if (x86_hasStackChanges)
{
pbStackChangeString = pbDecode;
bool last = false;
while (!last)
{
UInt8 b = *pbDecode++;
// 00111111 {delta} forwarder
// 00dddddd push 1, dddddd = delta
// nnnldddd pop nnn-1, l = last, dddd = delta (nnn=0 and nnn=1 are disallowed)
if (b == 0x3F)
{
// 00111111 {delta} forwarder
VarInt::ReadUnsigned(pbDecode);
}
else if (0 != (b & 0xC0))
{
// nnnldddd pop nnn-1, l = last, dddd = delta (nnn=0 and nnn=1 are disallowed)
last = ((b & 0x10) == 0x10);
}
}
}
#elif defined(_TARGET_ARM_)
arm_parmRegsPushedSet = 0;
arm_vfpRegPushedCount = 0;
arm_vfpRegFirstPushed = 0;
if (arm_areParmOrVfpRegsPushed)
{
UInt32 encodedValue = VarInt::ReadUnsigned(pbDecode);
arm_parmRegsPushedSet = encodedValue & 0x0f;
arm_vfpRegPushedCount = (UInt8)(encodedValue >> 4);
UInt32 vfpRegFirstPushed = encodedValue >> (8 + 4);
if (vfpRegFirstPushed == 0)
arm_vfpRegFirstPushed = 8;
else
arm_vfpRegFirstPushed = (UInt8)(vfpRegFirstPushed - 1);
}
#elif defined(_TARGET_ARM64_)
calleeSavedRegMask = arm64_calleeSavedRegMaskLow;
if (arm64_longCsrMask)
{
calleeSavedRegMask |= (*pbDecode++ << NUM_PRESERVED_REGS_LOW);
}
arm64_parmRegsPushedCount = 0;
arm64_vfpRegsPushedMask = 0;
if (arm64_areParmOrVfpRegsPushed)
{
UInt32 encodedValue = VarInt::ReadUnsigned(pbDecode);
arm64_vfpRegsPushedMask = (UInt8)encodedValue;
arm64_parmRegsPushedCount = (UInt8)(encodedValue >> 8);
ASSERT(arm64_parmRegsPushedCount <= 8);
}
#endif
extraDataHeader = hasExtraData ? ToUInt8(VarInt::ReadUnsigned(pbDecode)) : 0;
paramPointerReg = HasDynamicAlignment() ? ToUInt8(VarInt::ReadUnsigned(pbDecode)) : (UInt8)RN_NONE;
gsCookieOffset = hasGSCookie ? VarInt::ReadUnsigned(pbDecode) : 0;
epilogCount = epilogCountSmall < EC_MaxEpilogCountSmall ? epilogCountSmall : ToUInt16(VarInt::ReadUnsigned(pbDecode));
this->funcletOffset = 0;
if (hasFunclets)
{
// WORKAROUND: Epilog tables are still per-method instead of per-funclet, but we don't deal with
// them here. So we will simply overwrite the funclet's epilogAtEnd and epilogCount
// with the values from the main code body -- these were the values used to generate
// the per-method epilog table, so at least we're consistent with what is encoded.
UInt8 mainEpilogAtEnd = epilogAtEnd;
UInt16 mainEpilogCount = epilogCount;
UInt16 mainFixedEpilogSize = (UInt16) PeekFixedEpilogSize();
UInt8 mainHasCommonVars = hasCommonVars;
// -------
int nFunclets = (int)VarInt::ReadUnsigned(pbDecode);
int idxFunclet = -2;
UInt32 offsetFunclet = 0;
// Decode the funclet start offsets, remembering which one is of interest.
UInt32 prevFuncletStart = 0;
for (int i = 0; i < nFunclets; i++)
{
UInt32 offsetThisFunclet = prevFuncletStart + VarInt::ReadUnsigned(pbDecode);
if ((idxFunclet == -2) && (methodOffset < offsetThisFunclet))
{
idxFunclet = (i - 1);
offsetFunclet = prevFuncletStart;
}
prevFuncletStart = offsetThisFunclet;
}
if ((idxFunclet == -2) && (methodOffset >= prevFuncletStart))
{
idxFunclet = (nFunclets - 1);
offsetFunclet = prevFuncletStart;
}
// Now decode headers until we find the one we want. Keep decoding if we need to report a size.
if (pcbHeader || (idxFunclet >= 0))
{
for (int i = 0; i < nFunclets; i++)
{
size_t hdrSize;
if (i == idxFunclet)
{
this->DecodeHeader(methodOffset, pbDecode, &hdrSize);
pbDecode += hdrSize;
this->funcletOffset = offsetFunclet;
if (!pcbHeader) // if nobody is going to look at the header size, we don't need to keep going
break;
}
else
{
// keep decoding into a temp just to get the right header size
GCInfoHeader tmp;
tmp.DecodeHeader(methodOffset, pbDecode, &hdrSize);
pbDecode += hdrSize;
}
}
}
// WORKAROUND: see above
this->epilogAtEnd = mainEpilogAtEnd;
this->epilogCount = mainEpilogCount;
this->PokeFixedEpilogSize(mainFixedEpilogSize);
this->hasCommonVars = mainHasCommonVars;
// -------
}
// WARNING:
// WARNING: Do not add fields to the file-format after the funclet header encodings -- these are
// WARNING: decoded recursively and 'in-place' when looking for the info associated with a funclet.
// WARNING: Therefore, in that case, we cannot easily continue to decode things associated with the
// WARNING: main body GCInfoHeader once we start this recursive decode.
// WARNING:
if (pcbHeader)
*pcbHeader = pbDecode - pbHeaderEncoding;
return pbStackChangeString;
}
void GetFuncletInfo(PTR_UInt8 pbHeaderEncoding, UInt32* pnFuncletsOut, PTR_UInt8* pEncodedFuncletStartOffsets)
{
ASSERT(hasFunclets);
PTR_UInt8 pbDecode = pbHeaderEncoding + EC_SizeOfFixedHeader;
if (hasFrameSize) { VarInt::SkipUnsigned(pbDecode); }
if (returnKind == MRK_ReturnsToNative) { VarInt::SkipUnsigned(pbDecode); }
if (hasExtraData) { VarInt::SkipUnsigned(pbDecode); }
if (HasDynamicAlignment()) { VarInt::SkipUnsigned(pbDecode); }
if (hasGSCookie) { VarInt::SkipUnsigned(pbDecode); }
#ifdef _TARGET_AMD64_
if (x64_framePtrOffsetSmall == 0x3) { VarInt::SkipUnsigned(pbDecode); }
#elif defined(_TARGET_X86_)
if (x86_argCountIsLarge)
pbDecode++;
if (x86_hasStackChanges)
{
bool last = false;
while (!last)
{
UInt8 b = *pbDecode++;
// 00111111 {delta} forwarder
// 00dddddd push 1, dddddd = delta
// nnnldddd pop nnn-1, l = last, dddd = delta (nnn=0 and nnn=1 are disallowed)
if (b == 0x3F)
{
// 00111111 {delta} forwarder
VarInt::SkipUnsigned(pbDecode);
}
else if (0 != (b & 0xC0))
{
// nnnldddd pop nnn-1, l = last, dddd = delta (nnn=0 and nnn=1 are disallowed)
last = ((b & 0x10) == 0x10);
}
}
}
#elif defined(_TARGET_ARM_)
if (arm_areParmOrVfpRegsPushed) { VarInt::SkipUnsigned(pbDecode); }
#elif defined(_TARGET_ARM64_)
if (arm64_longCsrMask) { pbDecode++; }
if (arm64_areParmOrVfpRegsPushed) { VarInt::SkipUnsigned(pbDecode); }
#endif
*pnFuncletsOut = VarInt::ReadUnsigned(pbDecode);
*pEncodedFuncletStartOffsets = pbDecode;
}
#ifdef BINDER
bool IsOffsetInFunclet(UInt32 offset)
{
if (!hasFunclets)
return false;
return (offset >= cbThisCodeBody);
}
#endif // BINDER
bool IsValidEpilogOffset(UInt32 epilogOffset, UInt32 epilogSize)
{
if (!this->HasVaryingEpilogSizes())
return (epilogOffset < this->GetFixedEpilogSize());
else
return (epilogOffset < epilogSize);
}
#ifdef RHDUMP
char const * GetBoolStr(bool val) { return val ? " true" : "false"; }
char const * GetRetKindStr(int k)
{
switch (k)
{
case MRK_ReturnsScalar: return "scalar";
case MRK_ReturnsObject: return "object";
case MRK_ReturnsByref: return " byref";
case MRK_ReturnsToNative: return "native";
default: return "unknwn";
}
}
#define PRINT_CALLEE_SAVE(name, mask, val) {if ((val) & (mask)) { printf(name); }}
void PrintCalleeSavedRegs(UInt32 calleeSavedRegMask)
{
#ifdef _TARGET_ARM_
PRINT_CALLEE_SAVE(" r4" , CSR_MASK_R4 , calleeSavedRegMask);
PRINT_CALLEE_SAVE(" r5" , CSR_MASK_R5 , calleeSavedRegMask);
PRINT_CALLEE_SAVE(" r6" , CSR_MASK_R6 , calleeSavedRegMask);
PRINT_CALLEE_SAVE(" r7" , CSR_MASK_R7 , calleeSavedRegMask);
PRINT_CALLEE_SAVE(" r8" , CSR_MASK_R8 , calleeSavedRegMask);
PRINT_CALLEE_SAVE(" r9" , CSR_MASK_R9 , calleeSavedRegMask);
PRINT_CALLEE_SAVE(" r10", CSR_MASK_R10, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" r11", CSR_MASK_R11, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" lr" , CSR_MASK_LR , calleeSavedRegMask);
#elif defined(_TARGET_ARM64_)
PRINT_CALLEE_SAVE(" lr" , CSR_MASK_LR , calleeSavedRegMask);
PRINT_CALLEE_SAVE(" x19", CSR_MASK_X19, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" x20", CSR_MASK_X20, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" x21", CSR_MASK_X21, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" x22", CSR_MASK_X22, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" x23", CSR_MASK_X23, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" x24", CSR_MASK_X24, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" x25", CSR_MASK_X25, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" x26", CSR_MASK_X26, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" x27", CSR_MASK_X27, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" x28", CSR_MASK_X28, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" fp" , CSR_MASK_FP , calleeSavedRegMask);
#elif defined(_TARGET_X86_)
PRINT_CALLEE_SAVE(" ebx", CSR_MASK_RBX, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" esi", CSR_MASK_RSI, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" edi", CSR_MASK_RDI, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" ebp", CSR_MASK_RBP, calleeSavedRegMask);
#elif defined(_TARGET_AMD64_)
PRINT_CALLEE_SAVE(" rbx", CSR_MASK_RBX, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" rsi", CSR_MASK_RSI, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" rdi", CSR_MASK_RDI, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" rbp", CSR_MASK_RBP, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" r12", CSR_MASK_R12, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" r13", CSR_MASK_R13, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" r14", CSR_MASK_R14, calleeSavedRegMask);
PRINT_CALLEE_SAVE(" r15", CSR_MASK_R15, calleeSavedRegMask);
#else
#error unknown architecture
#endif
}
void PrintRegNumber(UInt8 regNumber)
{
switch (regNumber)
{
default: printf("???"); break;
#ifdef _TARGET_ARM_
case RN_R0: printf(" r0"); break;
case RN_R1: printf(" r1"); break;
case RN_R2: printf(" r2"); break;
case RN_R3: printf(" r3"); break;
case RN_R4: printf(" r4"); break;
case RN_R5: printf(" r5"); break;
case RN_R6: printf(" r6"); break;
case RN_R7: printf(" r7"); break;
case RN_R8: printf(" r8"); break;
case RN_R9: printf(" r9"); break;
case RN_R10: printf("r10"); break;
case RN_R11: printf("r11"); break;
case RN_R12: printf("r12"); break;
case RN_SP: printf(" sp"); break;
case RN_LR: printf(" lr"); break;
case RN_PC: printf(" pc"); break;
#elif defined(_TARGET_ARM64_)
case RN_X0: printf(" x0"); break;
case RN_X1: printf(" x1"); break;
case RN_X2: printf(" x2"); break;
case RN_X3: printf(" x3"); break;
case RN_X4: printf(" x4"); break;
case RN_X5: printf(" x5"); break;
case RN_X6: printf(" x6"); break;
case RN_X7: printf(" x7"); break;
case RN_X8: printf(" x8"); break;
case RN_X9: printf(" x9"); break;
case RN_X10: printf("x10"); break;
case RN_X11: printf("x11"); break;
case RN_X12: printf("x12"); break;
case RN_X13: printf("x13"); break;
case RN_X14: printf("x14"); break;
case RN_X15: printf("x15"); break;
case RN_XIP0: printf("xip0"); break;
case RN_XIP1: printf("xip1"); break;
case RN_XPR: printf("xpr"); break;
case RN_X19: printf("x19"); break;
case RN_X20: printf("x20"); break;
case RN_X21: printf("x21"); break;
case RN_X22: printf("x22"); break;
case RN_X23: printf("x23"); break;
case RN_X24: printf("x24"); break;
case RN_X25: printf("x25"); break;
case RN_X26: printf("x26"); break;
case RN_X27: printf("x27"); break;
case RN_X28: printf("x28"); break;
case RN_FP: printf(" fp"); break;
case RN_LR: printf(" lr"); break;
case RN_SP: printf(" sp"); break;
#elif defined(_TARGET_X86_)
case RN_EAX: printf("eax"); break;
case RN_ECX: printf("ecx"); break;
case RN_EDX: printf("edx"); break;
case RN_EBX: printf("ebx"); break;
case RN_ESP: printf("esp"); break;
case RN_EBP: printf("ebp"); break;
case RN_ESI: printf("esi"); break;
case RN_EDI: printf("edi"); break;
#elif defined(_TARGET_AMD64_)
case RN_EAX: printf("rax"); break;
case RN_ECX: printf("rcx"); break;
case RN_EDX: printf("rdx"); break;
case RN_EBX: printf("rbx"); break;
case RN_ESP: printf("rsp"); break;
case RN_EBP: printf("rbp"); break;
case RN_ESI: printf("rsi"); break;
case RN_EDI: printf("rdi"); break;
case RN_R8: printf(" r8"); break;
case RN_R9: printf(" r9"); break;
case RN_R10: printf("r10"); break;
case RN_R11: printf("r11"); break;
case RN_R12: printf("r12"); break;
case RN_R13: printf("r13"); break;
case RN_R14: printf("r14"); break;
case RN_R15: printf("r15"); break;
#else
#error unknown architecture
#endif
}
}
void Dump()
{
printf(" | prologSize: %02X"" | epilogSize: %02X"" | epilogCount: %02X"" | epilogAtEnd: %s\n",
GetPrologSize(), PeekFixedEpilogSize(), epilogCount, GetBoolStr(epilogAtEnd));
printf(" | frameSize: %04X"" | ebpFrame: %s"" | hasFunclets: %s"" | returnKind: %s\n",
GetFrameSize(), GetBoolStr(ebpFrame), GetBoolStr(hasFunclets), GetRetKindStr(returnKind));
printf(" | regMask: %04X" " {", calleeSavedRegMask);
PrintCalleeSavedRegs(calleeSavedRegMask);
printf(" }\n");
if (HasDynamicAlignment())
{
printf(" | stackAlign: %02X"" | paramPtrReg: ", GetDynamicAlignment());
PrintRegNumber(paramPointerReg);
printf("\n");
}
if (hasGSCookie)
{
printf(" | gsCookieOffset: %04X\n", GetGSCookieOffset());
}
#ifdef _TARGET_ARM_
if (arm_areParmOrVfpRegsPushed)
{
if (arm_parmRegsPushedSet != 0)
{
printf(" | parmRegs: %02X {", arm_parmRegsPushedSet);
PRINT_CALLEE_SAVE(" r0", SR_MASK_R0, arm_parmRegsPushedSet);
PRINT_CALLEE_SAVE(" r1", SR_MASK_R1, arm_parmRegsPushedSet);
PRINT_CALLEE_SAVE(" r2", SR_MASK_R2, arm_parmRegsPushedSet);
PRINT_CALLEE_SAVE(" r3", SR_MASK_R3, arm_parmRegsPushedSet);
printf(" }\n");
}
if (arm_vfpRegPushedCount != 0)
{
printf(" | vfpRegs: %d(%d) {", arm_vfpRegFirstPushed, arm_vfpRegPushedCount);
printf(" d%d", arm_vfpRegFirstPushed);
if (arm_vfpRegPushedCount > 1)
printf("-d%d", arm_vfpRegFirstPushed + arm_vfpRegPushedCount - 1);
printf(" }\n");
}
}
#elif defined(_TARGET_ARM64_)
if (arm64_areParmOrVfpRegsPushed)
{
if (arm64_parmRegsPushedCount != 0)
{
printf(" | parmRegsCount: %d\n", arm64_parmRegsPushedCount);
}
if (arm64_vfpRegsPushedMask != 0)
{
printf(" | vfpRegs: %02X {", arm64_vfpRegsPushedMask);
for (int reg = 0; reg < 8; reg++)
{
if (arm64_vfpRegsPushedMask & (1 << reg))
printf(" d%d", reg + 8);
}
printf(" }\n");
}
}
#elif defined(_TARGET_AMD64_)
if (x64_hasSavedXmmRegs)
{
printf(" | xmmRegs: %04X {", x64_savedXmmRegMask);
for (int reg = 6; reg < 16; reg++)
{
if (x64_savedXmmRegMask & (1<<reg))
printf(" xmm%d", reg);
}
printf(" }\n");
}
#endif // _TARGET_ARM_
// x64_framePtrOffsetSmall / [opt] x64_framePtrOffset
// x86_argCountLow [opt] x86_argCountHigh
// x86_argCountIsLarge
// x86_hasStackChanges
// [opt] reversePinvokeFrameOffset
// [opt] numFunclets
}
#endif // RHDUMP
};
/*****************************************************************************/
#endif //_GCINFO_H_
/*****************************************************************************/
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