github.com/eh-steve/goloader@v0.0.0-20240111193454-90ff3cfdae39/objabi/dataindex/dataindex.1.20.go (about)

     1  //go:build go1.20 && !go1.23
     2  // +build go1.20,!go1.23
     3  
     4  package dataindex
     5  
     6  // This file defines the IDs for PCDATA and FUNCDATA instructions
     7  // in Go binaries.
     8  //
     9  // These must agree with ../../../runtime/funcdata.h and
    10  // ../../../runtime/symtab.go.
    11  
    12  const (
    13  	PCDATA_UnsafePoint   = 0
    14  	PCDATA_StackMapIndex = 1
    15  	PCDATA_InlTreeIndex  = 2
    16  	PCDATA_ArgLiveIndex  = 3
    17  
    18  	FUNCDATA_ArgsPointerMaps    = 0
    19  	FUNCDATA_LocalsPointerMaps  = 1
    20  	FUNCDATA_StackObjects       = 2
    21  	FUNCDATA_InlTree            = 3
    22  	FUNCDATA_OpenCodedDeferInfo = 4
    23  	FUNCDATA_ArgInfo            = 5
    24  	FUNCDATA_ArgLiveInfo        = 6
    25  	FUNCDATA_WrapInfo           = 7
    26  
    27  	// ArgsSizeUnknown is set in Func.argsize to mark all functions
    28  	// whose argument size is unknown (C vararg functions, and
    29  	// assembly code without an explicit specification).
    30  	// This value is generated by the compiler, assembler, or linker.
    31  	ArgsSizeUnknown = -0x80000000
    32  )
    33  
    34  // Special PCDATA values.
    35  const (
    36  	// PCDATA_UnsafePoint values.
    37  	PCDATA_UnsafePointSafe   = -1 // Safe for async preemption
    38  	PCDATA_UnsafePointUnsafe = -2 // Unsafe for async preemption
    39  
    40  	// PCDATA_Restart1(2) apply on a sequence of instructions, within
    41  	// which if an async preemption happens, we should back off the PC
    42  	// to the start of the sequence when resuming.
    43  	// We need two so we can distinguish the start/end of the sequence
    44  	// in case that two sequences are next to each other.
    45  	PCDATA_Restart1 = -3
    46  	PCDATA_Restart2 = -4
    47  
    48  	// Like PCDATA_Restart1, but back to function entry if async preempted.
    49  	PCDATA_RestartAtEntry = -5
    50  )