mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-05 01:52:46 +00:00
1651 lines
43 KiB
Go
1651 lines
43 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package dwarf generates DWARF debugging information.
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// DWARF generation is split between the compiler and the linker,
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// this package contains the shared code.
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package dwarf
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import (
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"bytes"
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"github.com/twitchyliquid64/golang-asm/objabi"
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"errors"
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"fmt"
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"os/exec"
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"sort"
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"strconv"
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"strings"
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)
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// InfoPrefix is the prefix for all the symbols containing DWARF info entries.
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const InfoPrefix = "go.info."
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// ConstInfoPrefix is the prefix for all symbols containing DWARF info
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// entries that contain constants.
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const ConstInfoPrefix = "go.constinfo."
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// CUInfoPrefix is the prefix for symbols containing information to
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// populate the DWARF compilation unit info entries.
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const CUInfoPrefix = "go.cuinfo."
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// Used to form the symbol name assigned to the DWARF 'abstract subprogram"
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// info entry for a function
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const AbstractFuncSuffix = "$abstract"
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// Controls logging/debugging for selected aspects of DWARF subprogram
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// generation (functions, scopes).
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var logDwarf bool
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// Sym represents a symbol.
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type Sym interface {
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Length(dwarfContext interface{}) int64
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}
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// A Var represents a local variable or a function parameter.
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type Var struct {
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Name string
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Abbrev int // Either DW_ABRV_AUTO[_LOCLIST] or DW_ABRV_PARAM[_LOCLIST]
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IsReturnValue bool
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IsInlFormal bool
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StackOffset int32
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// This package can't use the ssa package, so it can't mention ssa.FuncDebug,
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// so indirect through a closure.
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PutLocationList func(listSym, startPC Sym)
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Scope int32
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Type Sym
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DeclFile string
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DeclLine uint
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DeclCol uint
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InlIndex int32 // subtract 1 to form real index into InlTree
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ChildIndex int32 // child DIE index in abstract function
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IsInAbstract bool // variable exists in abstract function
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}
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// A Scope represents a lexical scope. All variables declared within a
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// scope will only be visible to instructions covered by the scope.
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// Lexical scopes are contiguous in source files but can end up being
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// compiled to discontiguous blocks of instructions in the executable.
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// The Ranges field lists all the blocks of instructions that belong
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// in this scope.
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type Scope struct {
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Parent int32
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Ranges []Range
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Vars []*Var
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}
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// A Range represents a half-open interval [Start, End).
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type Range struct {
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Start, End int64
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}
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// This container is used by the PutFunc* variants below when
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// creating the DWARF subprogram DIE(s) for a function.
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type FnState struct {
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Name string
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Importpath string
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Info Sym
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Filesym Sym
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Loc Sym
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Ranges Sym
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Absfn Sym
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StartPC Sym
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Size int64
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External bool
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Scopes []Scope
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InlCalls InlCalls
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UseBASEntries bool
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}
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func EnableLogging(doit bool) {
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logDwarf = doit
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}
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// UnifyRanges merges the list of ranges of c into the list of ranges of s
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func (s *Scope) UnifyRanges(c *Scope) {
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out := make([]Range, 0, len(s.Ranges)+len(c.Ranges))
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i, j := 0, 0
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for {
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var cur Range
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if i < len(s.Ranges) && j < len(c.Ranges) {
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if s.Ranges[i].Start < c.Ranges[j].Start {
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cur = s.Ranges[i]
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i++
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} else {
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cur = c.Ranges[j]
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j++
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}
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} else if i < len(s.Ranges) {
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cur = s.Ranges[i]
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i++
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} else if j < len(c.Ranges) {
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cur = c.Ranges[j]
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j++
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} else {
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break
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}
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if n := len(out); n > 0 && cur.Start <= out[n-1].End {
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out[n-1].End = cur.End
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} else {
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out = append(out, cur)
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}
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}
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s.Ranges = out
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}
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// AppendRange adds r to s, if r is non-empty.
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// If possible, it extends the last Range in s.Ranges; if not, it creates a new one.
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func (s *Scope) AppendRange(r Range) {
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if r.End <= r.Start {
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return
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}
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i := len(s.Ranges)
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if i > 0 && s.Ranges[i-1].End == r.Start {
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s.Ranges[i-1].End = r.End
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return
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}
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s.Ranges = append(s.Ranges, r)
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}
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type InlCalls struct {
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Calls []InlCall
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}
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type InlCall struct {
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// index into ctx.InlTree describing the call inlined here
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InlIndex int
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// Symbol of file containing inlined call site (really *obj.LSym).
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CallFile Sym
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// Line number of inlined call site.
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CallLine uint32
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// Dwarf abstract subroutine symbol (really *obj.LSym).
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AbsFunSym Sym
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// Indices of child inlines within Calls array above.
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Children []int
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// entries in this list are PAUTO's created by the inliner to
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// capture the promoted formals and locals of the inlined callee.
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InlVars []*Var
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// PC ranges for this inlined call.
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Ranges []Range
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// Root call (not a child of some other call).
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Root bool
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}
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// A Context specifies how to add data to a Sym.
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type Context interface {
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PtrSize() int
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AddInt(s Sym, size int, i int64)
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AddBytes(s Sym, b []byte)
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AddAddress(s Sym, t interface{}, ofs int64)
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AddCURelativeAddress(s Sym, t interface{}, ofs int64)
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AddSectionOffset(s Sym, size int, t interface{}, ofs int64)
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AddDWARFAddrSectionOffset(s Sym, t interface{}, ofs int64)
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CurrentOffset(s Sym) int64
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RecordDclReference(from Sym, to Sym, dclIdx int, inlIndex int)
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RecordChildDieOffsets(s Sym, vars []*Var, offsets []int32)
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AddString(s Sym, v string)
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AddFileRef(s Sym, f interface{})
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Logf(format string, args ...interface{})
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}
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// AppendUleb128 appends v to b using DWARF's unsigned LEB128 encoding.
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func AppendUleb128(b []byte, v uint64) []byte {
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for {
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c := uint8(v & 0x7f)
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v >>= 7
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if v != 0 {
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c |= 0x80
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}
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b = append(b, c)
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if c&0x80 == 0 {
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break
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}
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}
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return b
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}
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// AppendSleb128 appends v to b using DWARF's signed LEB128 encoding.
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func AppendSleb128(b []byte, v int64) []byte {
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for {
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c := uint8(v & 0x7f)
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s := uint8(v & 0x40)
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v >>= 7
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if (v != -1 || s == 0) && (v != 0 || s != 0) {
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c |= 0x80
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}
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b = append(b, c)
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if c&0x80 == 0 {
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break
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}
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}
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return b
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}
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// sevenbits contains all unsigned seven bit numbers, indexed by their value.
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var sevenbits = [...]byte{
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
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0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
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0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
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0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
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0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
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0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
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0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
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}
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// sevenBitU returns the unsigned LEB128 encoding of v if v is seven bits and nil otherwise.
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// The contents of the returned slice must not be modified.
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func sevenBitU(v int64) []byte {
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if uint64(v) < uint64(len(sevenbits)) {
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return sevenbits[v : v+1]
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}
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return nil
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}
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// sevenBitS returns the signed LEB128 encoding of v if v is seven bits and nil otherwise.
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// The contents of the returned slice must not be modified.
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func sevenBitS(v int64) []byte {
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if uint64(v) <= 63 {
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return sevenbits[v : v+1]
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}
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if uint64(-v) <= 64 {
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return sevenbits[128+v : 128+v+1]
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}
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return nil
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}
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// Uleb128put appends v to s using DWARF's unsigned LEB128 encoding.
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func Uleb128put(ctxt Context, s Sym, v int64) {
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b := sevenBitU(v)
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if b == nil {
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var encbuf [20]byte
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b = AppendUleb128(encbuf[:0], uint64(v))
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}
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ctxt.AddBytes(s, b)
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}
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// Sleb128put appends v to s using DWARF's signed LEB128 encoding.
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func Sleb128put(ctxt Context, s Sym, v int64) {
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b := sevenBitS(v)
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if b == nil {
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var encbuf [20]byte
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b = AppendSleb128(encbuf[:0], v)
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}
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ctxt.AddBytes(s, b)
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}
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/*
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* Defining Abbrevs. This is hardcoded on a per-platform basis (that is,
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* each platform will see a fixed abbrev table for all objects); the number
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* of abbrev entries is fairly small (compared to C++ objects). The DWARF
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* spec places no restriction on the ordering of attributes in the
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* Abbrevs and DIEs, and we will always write them out in the order
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* of declaration in the abbrev.
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*/
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type dwAttrForm struct {
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attr uint16
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form uint8
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}
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// Go-specific type attributes.
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const (
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DW_AT_go_kind = 0x2900
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DW_AT_go_key = 0x2901
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DW_AT_go_elem = 0x2902
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// Attribute for DW_TAG_member of a struct type.
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// Nonzero value indicates the struct field is an embedded field.
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DW_AT_go_embedded_field = 0x2903
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DW_AT_go_runtime_type = 0x2904
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DW_AT_go_package_name = 0x2905 // Attribute for DW_TAG_compile_unit
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DW_AT_internal_location = 253 // params and locals; not emitted
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)
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// Index into the abbrevs table below.
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// Keep in sync with ispubname() and ispubtype() in ld/dwarf.go.
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// ispubtype considers >= NULLTYPE public
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const (
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DW_ABRV_NULL = iota
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DW_ABRV_COMPUNIT
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DW_ABRV_COMPUNIT_TEXTLESS
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DW_ABRV_FUNCTION
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DW_ABRV_FUNCTION_ABSTRACT
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DW_ABRV_FUNCTION_CONCRETE
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DW_ABRV_INLINED_SUBROUTINE
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DW_ABRV_INLINED_SUBROUTINE_RANGES
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DW_ABRV_VARIABLE
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DW_ABRV_INT_CONSTANT
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DW_ABRV_AUTO
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DW_ABRV_AUTO_LOCLIST
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DW_ABRV_AUTO_ABSTRACT
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DW_ABRV_AUTO_CONCRETE
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DW_ABRV_AUTO_CONCRETE_LOCLIST
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DW_ABRV_PARAM
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DW_ABRV_PARAM_LOCLIST
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DW_ABRV_PARAM_ABSTRACT
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DW_ABRV_PARAM_CONCRETE
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DW_ABRV_PARAM_CONCRETE_LOCLIST
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DW_ABRV_LEXICAL_BLOCK_RANGES
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DW_ABRV_LEXICAL_BLOCK_SIMPLE
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DW_ABRV_STRUCTFIELD
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DW_ABRV_FUNCTYPEPARAM
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DW_ABRV_DOTDOTDOT
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DW_ABRV_ARRAYRANGE
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DW_ABRV_NULLTYPE
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DW_ABRV_BASETYPE
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DW_ABRV_ARRAYTYPE
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DW_ABRV_CHANTYPE
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DW_ABRV_FUNCTYPE
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DW_ABRV_IFACETYPE
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DW_ABRV_MAPTYPE
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DW_ABRV_PTRTYPE
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DW_ABRV_BARE_PTRTYPE // only for void*, no DW_AT_type attr to please gdb 6.
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DW_ABRV_SLICETYPE
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DW_ABRV_STRINGTYPE
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DW_ABRV_STRUCTTYPE
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DW_ABRV_TYPEDECL
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DW_NABRV
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)
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type dwAbbrev struct {
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tag uint8
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children uint8
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attr []dwAttrForm
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}
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var abbrevsFinalized bool
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// expandPseudoForm takes an input DW_FORM_xxx value and translates it
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// into a platform-appropriate concrete form. Existing concrete/real
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// DW_FORM values are left untouched. For the moment the only
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// pseudo-form is DW_FORM_udata_pseudo, which gets expanded to
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// DW_FORM_data4 on Darwin and DW_FORM_udata everywhere else. See
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// issue #31459 for more context.
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func expandPseudoForm(form uint8) uint8 {
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// Is this a pseudo-form?
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if form != DW_FORM_udata_pseudo {
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return form
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}
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expandedForm := DW_FORM_udata
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if objabi.GOOS == "darwin" {
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expandedForm = DW_FORM_data4
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}
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return uint8(expandedForm)
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}
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// Abbrevs() returns the finalized abbrev array for the platform,
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// expanding any DW_FORM pseudo-ops to real values.
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func Abbrevs() []dwAbbrev {
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if abbrevsFinalized {
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return abbrevs[:]
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}
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for i := 1; i < DW_NABRV; i++ {
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for j := 0; j < len(abbrevs[i].attr); j++ {
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abbrevs[i].attr[j].form = expandPseudoForm(abbrevs[i].attr[j].form)
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}
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}
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abbrevsFinalized = true
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return abbrevs[:]
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}
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// abbrevs is a raw table of abbrev entries; it needs to be post-processed
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// by the Abbrevs() function above prior to being consumed, to expand
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// the 'pseudo-form' entries below to real DWARF form values.
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var abbrevs = [DW_NABRV]dwAbbrev{
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/* The mandatory DW_ABRV_NULL entry. */
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{0, 0, []dwAttrForm{}},
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/* COMPUNIT */
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{
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DW_TAG_compile_unit,
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DW_CHILDREN_yes,
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[]dwAttrForm{
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{DW_AT_name, DW_FORM_string},
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{DW_AT_language, DW_FORM_data1},
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{DW_AT_stmt_list, DW_FORM_sec_offset},
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{DW_AT_low_pc, DW_FORM_addr},
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{DW_AT_ranges, DW_FORM_sec_offset},
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{DW_AT_comp_dir, DW_FORM_string},
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{DW_AT_producer, DW_FORM_string},
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{DW_AT_go_package_name, DW_FORM_string},
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},
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},
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/* COMPUNIT_TEXTLESS */
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{
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DW_TAG_compile_unit,
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DW_CHILDREN_yes,
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[]dwAttrForm{
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{DW_AT_name, DW_FORM_string},
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{DW_AT_language, DW_FORM_data1},
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{DW_AT_comp_dir, DW_FORM_string},
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{DW_AT_producer, DW_FORM_string},
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{DW_AT_go_package_name, DW_FORM_string},
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},
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},
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/* FUNCTION */
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{
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DW_TAG_subprogram,
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DW_CHILDREN_yes,
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[]dwAttrForm{
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{DW_AT_name, DW_FORM_string},
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{DW_AT_low_pc, DW_FORM_addr},
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{DW_AT_high_pc, DW_FORM_addr},
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{DW_AT_frame_base, DW_FORM_block1},
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{DW_AT_decl_file, DW_FORM_data4},
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{DW_AT_external, DW_FORM_flag},
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},
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},
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/* FUNCTION_ABSTRACT */
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{
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DW_TAG_subprogram,
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DW_CHILDREN_yes,
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[]dwAttrForm{
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{DW_AT_name, DW_FORM_string},
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{DW_AT_inline, DW_FORM_data1},
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{DW_AT_external, DW_FORM_flag},
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},
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},
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/* FUNCTION_CONCRETE */
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{
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DW_TAG_subprogram,
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DW_CHILDREN_yes,
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[]dwAttrForm{
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{DW_AT_abstract_origin, DW_FORM_ref_addr},
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{DW_AT_low_pc, DW_FORM_addr},
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{DW_AT_high_pc, DW_FORM_addr},
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{DW_AT_frame_base, DW_FORM_block1},
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},
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},
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/* INLINED_SUBROUTINE */
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{
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DW_TAG_inlined_subroutine,
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DW_CHILDREN_yes,
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[]dwAttrForm{
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{DW_AT_abstract_origin, DW_FORM_ref_addr},
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{DW_AT_low_pc, DW_FORM_addr},
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{DW_AT_high_pc, DW_FORM_addr},
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{DW_AT_call_file, DW_FORM_data4},
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{DW_AT_call_line, DW_FORM_udata_pseudo}, // pseudo-form
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},
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},
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|
/* INLINED_SUBROUTINE_RANGES */
|
|
{
|
|
DW_TAG_inlined_subroutine,
|
|
DW_CHILDREN_yes,
|
|
[]dwAttrForm{
|
|
{DW_AT_abstract_origin, DW_FORM_ref_addr},
|
|
{DW_AT_ranges, DW_FORM_sec_offset},
|
|
{DW_AT_call_file, DW_FORM_data4},
|
|
{DW_AT_call_line, DW_FORM_udata_pseudo}, // pseudo-form
|
|
},
|
|
},
|
|
|
|
/* VARIABLE */
|
|
{
|
|
DW_TAG_variable,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_location, DW_FORM_block1},
|
|
{DW_AT_type, DW_FORM_ref_addr},
|
|
{DW_AT_external, DW_FORM_flag},
|
|
},
|
|
},
|
|
|
|
/* INT CONSTANT */
|
|
{
|
|
DW_TAG_constant,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_type, DW_FORM_ref_addr},
|
|
{DW_AT_const_value, DW_FORM_sdata},
|
|
},
|
|
},
|
|
|
|
/* AUTO */
|
|
{
|
|
DW_TAG_variable,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_decl_line, DW_FORM_udata},
|
|
{DW_AT_type, DW_FORM_ref_addr},
|
|
{DW_AT_location, DW_FORM_block1},
|
|
},
|
|
},
|
|
|
|
/* AUTO_LOCLIST */
|
|
{
|
|
DW_TAG_variable,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_decl_line, DW_FORM_udata},
|
|
{DW_AT_type, DW_FORM_ref_addr},
|
|
{DW_AT_location, DW_FORM_sec_offset},
|
|
},
|
|
},
|
|
|
|
/* AUTO_ABSTRACT */
|
|
{
|
|
DW_TAG_variable,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_decl_line, DW_FORM_udata},
|
|
{DW_AT_type, DW_FORM_ref_addr},
|
|
},
|
|
},
|
|
|
|
/* AUTO_CONCRETE */
|
|
{
|
|
DW_TAG_variable,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_abstract_origin, DW_FORM_ref_addr},
|
|
{DW_AT_location, DW_FORM_block1},
|
|
},
|
|
},
|
|
|
|
/* AUTO_CONCRETE_LOCLIST */
|
|
{
|
|
DW_TAG_variable,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_abstract_origin, DW_FORM_ref_addr},
|
|
{DW_AT_location, DW_FORM_sec_offset},
|
|
},
|
|
},
|
|
|
|
/* PARAM */
|
|
{
|
|
DW_TAG_formal_parameter,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_variable_parameter, DW_FORM_flag},
|
|
{DW_AT_decl_line, DW_FORM_udata},
|
|
{DW_AT_type, DW_FORM_ref_addr},
|
|
{DW_AT_location, DW_FORM_block1},
|
|
},
|
|
},
|
|
|
|
/* PARAM_LOCLIST */
|
|
{
|
|
DW_TAG_formal_parameter,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_variable_parameter, DW_FORM_flag},
|
|
{DW_AT_decl_line, DW_FORM_udata},
|
|
{DW_AT_type, DW_FORM_ref_addr},
|
|
{DW_AT_location, DW_FORM_sec_offset},
|
|
},
|
|
},
|
|
|
|
/* PARAM_ABSTRACT */
|
|
{
|
|
DW_TAG_formal_parameter,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_variable_parameter, DW_FORM_flag},
|
|
{DW_AT_type, DW_FORM_ref_addr},
|
|
},
|
|
},
|
|
|
|
/* PARAM_CONCRETE */
|
|
{
|
|
DW_TAG_formal_parameter,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_abstract_origin, DW_FORM_ref_addr},
|
|
{DW_AT_location, DW_FORM_block1},
|
|
},
|
|
},
|
|
|
|
/* PARAM_CONCRETE_LOCLIST */
|
|
{
|
|
DW_TAG_formal_parameter,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_abstract_origin, DW_FORM_ref_addr},
|
|
{DW_AT_location, DW_FORM_sec_offset},
|
|
},
|
|
},
|
|
|
|
/* LEXICAL_BLOCK_RANGES */
|
|
{
|
|
DW_TAG_lexical_block,
|
|
DW_CHILDREN_yes,
|
|
[]dwAttrForm{
|
|
{DW_AT_ranges, DW_FORM_sec_offset},
|
|
},
|
|
},
|
|
|
|
/* LEXICAL_BLOCK_SIMPLE */
|
|
{
|
|
DW_TAG_lexical_block,
|
|
DW_CHILDREN_yes,
|
|
[]dwAttrForm{
|
|
{DW_AT_low_pc, DW_FORM_addr},
|
|
{DW_AT_high_pc, DW_FORM_addr},
|
|
},
|
|
},
|
|
|
|
/* STRUCTFIELD */
|
|
{
|
|
DW_TAG_member,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_data_member_location, DW_FORM_udata},
|
|
{DW_AT_type, DW_FORM_ref_addr},
|
|
{DW_AT_go_embedded_field, DW_FORM_flag},
|
|
},
|
|
},
|
|
|
|
/* FUNCTYPEPARAM */
|
|
{
|
|
DW_TAG_formal_parameter,
|
|
DW_CHILDREN_no,
|
|
|
|
// No name!
|
|
[]dwAttrForm{
|
|
{DW_AT_type, DW_FORM_ref_addr},
|
|
},
|
|
},
|
|
|
|
/* DOTDOTDOT */
|
|
{
|
|
DW_TAG_unspecified_parameters,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{},
|
|
},
|
|
|
|
/* ARRAYRANGE */
|
|
{
|
|
DW_TAG_subrange_type,
|
|
DW_CHILDREN_no,
|
|
|
|
// No name!
|
|
[]dwAttrForm{
|
|
{DW_AT_type, DW_FORM_ref_addr},
|
|
{DW_AT_count, DW_FORM_udata},
|
|
},
|
|
},
|
|
|
|
// Below here are the types considered public by ispubtype
|
|
/* NULLTYPE */
|
|
{
|
|
DW_TAG_unspecified_type,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
},
|
|
},
|
|
|
|
/* BASETYPE */
|
|
{
|
|
DW_TAG_base_type,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_encoding, DW_FORM_data1},
|
|
{DW_AT_byte_size, DW_FORM_data1},
|
|
{DW_AT_go_kind, DW_FORM_data1},
|
|
{DW_AT_go_runtime_type, DW_FORM_addr},
|
|
},
|
|
},
|
|
|
|
/* ARRAYTYPE */
|
|
// child is subrange with upper bound
|
|
{
|
|
DW_TAG_array_type,
|
|
DW_CHILDREN_yes,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_type, DW_FORM_ref_addr},
|
|
{DW_AT_byte_size, DW_FORM_udata},
|
|
{DW_AT_go_kind, DW_FORM_data1},
|
|
{DW_AT_go_runtime_type, DW_FORM_addr},
|
|
},
|
|
},
|
|
|
|
/* CHANTYPE */
|
|
{
|
|
DW_TAG_typedef,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_type, DW_FORM_ref_addr},
|
|
{DW_AT_go_kind, DW_FORM_data1},
|
|
{DW_AT_go_runtime_type, DW_FORM_addr},
|
|
{DW_AT_go_elem, DW_FORM_ref_addr},
|
|
},
|
|
},
|
|
|
|
/* FUNCTYPE */
|
|
{
|
|
DW_TAG_subroutine_type,
|
|
DW_CHILDREN_yes,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_byte_size, DW_FORM_udata},
|
|
{DW_AT_go_kind, DW_FORM_data1},
|
|
{DW_AT_go_runtime_type, DW_FORM_addr},
|
|
},
|
|
},
|
|
|
|
/* IFACETYPE */
|
|
{
|
|
DW_TAG_typedef,
|
|
DW_CHILDREN_yes,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_type, DW_FORM_ref_addr},
|
|
{DW_AT_go_kind, DW_FORM_data1},
|
|
{DW_AT_go_runtime_type, DW_FORM_addr},
|
|
},
|
|
},
|
|
|
|
/* MAPTYPE */
|
|
{
|
|
DW_TAG_typedef,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_type, DW_FORM_ref_addr},
|
|
{DW_AT_go_kind, DW_FORM_data1},
|
|
{DW_AT_go_runtime_type, DW_FORM_addr},
|
|
{DW_AT_go_key, DW_FORM_ref_addr},
|
|
{DW_AT_go_elem, DW_FORM_ref_addr},
|
|
},
|
|
},
|
|
|
|
/* PTRTYPE */
|
|
{
|
|
DW_TAG_pointer_type,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_type, DW_FORM_ref_addr},
|
|
{DW_AT_go_kind, DW_FORM_data1},
|
|
{DW_AT_go_runtime_type, DW_FORM_addr},
|
|
},
|
|
},
|
|
|
|
/* BARE_PTRTYPE */
|
|
{
|
|
DW_TAG_pointer_type,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
},
|
|
},
|
|
|
|
/* SLICETYPE */
|
|
{
|
|
DW_TAG_structure_type,
|
|
DW_CHILDREN_yes,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_byte_size, DW_FORM_udata},
|
|
{DW_AT_go_kind, DW_FORM_data1},
|
|
{DW_AT_go_runtime_type, DW_FORM_addr},
|
|
{DW_AT_go_elem, DW_FORM_ref_addr},
|
|
},
|
|
},
|
|
|
|
/* STRINGTYPE */
|
|
{
|
|
DW_TAG_structure_type,
|
|
DW_CHILDREN_yes,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_byte_size, DW_FORM_udata},
|
|
{DW_AT_go_kind, DW_FORM_data1},
|
|
{DW_AT_go_runtime_type, DW_FORM_addr},
|
|
},
|
|
},
|
|
|
|
/* STRUCTTYPE */
|
|
{
|
|
DW_TAG_structure_type,
|
|
DW_CHILDREN_yes,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_byte_size, DW_FORM_udata},
|
|
{DW_AT_go_kind, DW_FORM_data1},
|
|
{DW_AT_go_runtime_type, DW_FORM_addr},
|
|
},
|
|
},
|
|
|
|
/* TYPEDECL */
|
|
{
|
|
DW_TAG_typedef,
|
|
DW_CHILDREN_no,
|
|
[]dwAttrForm{
|
|
{DW_AT_name, DW_FORM_string},
|
|
{DW_AT_type, DW_FORM_ref_addr},
|
|
},
|
|
},
|
|
}
|
|
|
|
// GetAbbrev returns the contents of the .debug_abbrev section.
|
|
func GetAbbrev() []byte {
|
|
abbrevs := Abbrevs()
|
|
var buf []byte
|
|
for i := 1; i < DW_NABRV; i++ {
|
|
// See section 7.5.3
|
|
buf = AppendUleb128(buf, uint64(i))
|
|
buf = AppendUleb128(buf, uint64(abbrevs[i].tag))
|
|
buf = append(buf, abbrevs[i].children)
|
|
for _, f := range abbrevs[i].attr {
|
|
buf = AppendUleb128(buf, uint64(f.attr))
|
|
buf = AppendUleb128(buf, uint64(f.form))
|
|
}
|
|
buf = append(buf, 0, 0)
|
|
}
|
|
return append(buf, 0)
|
|
}
|
|
|
|
/*
|
|
* Debugging Information Entries and their attributes.
|
|
*/
|
|
|
|
// DWAttr represents an attribute of a DWDie.
|
|
//
|
|
// For DW_CLS_string and _block, value should contain the length, and
|
|
// data the data, for _reference, value is 0 and data is a DWDie* to
|
|
// the referenced instance, for all others, value is the whole thing
|
|
// and data is null.
|
|
type DWAttr struct {
|
|
Link *DWAttr
|
|
Atr uint16 // DW_AT_
|
|
Cls uint8 // DW_CLS_
|
|
Value int64
|
|
Data interface{}
|
|
}
|
|
|
|
// DWDie represents a DWARF debug info entry.
|
|
type DWDie struct {
|
|
Abbrev int
|
|
Link *DWDie
|
|
Child *DWDie
|
|
Attr *DWAttr
|
|
Sym Sym
|
|
}
|
|
|
|
func putattr(ctxt Context, s Sym, abbrev int, form int, cls int, value int64, data interface{}) error {
|
|
switch form {
|
|
case DW_FORM_addr: // address
|
|
// Allow nil addresses for DW_AT_go_runtime_type.
|
|
if data == nil && value == 0 {
|
|
ctxt.AddInt(s, ctxt.PtrSize(), 0)
|
|
break
|
|
}
|
|
if cls == DW_CLS_GO_TYPEREF {
|
|
ctxt.AddSectionOffset(s, ctxt.PtrSize(), data, value)
|
|
break
|
|
}
|
|
ctxt.AddAddress(s, data, value)
|
|
|
|
case DW_FORM_block1: // block
|
|
if cls == DW_CLS_ADDRESS {
|
|
ctxt.AddInt(s, 1, int64(1+ctxt.PtrSize()))
|
|
ctxt.AddInt(s, 1, DW_OP_addr)
|
|
ctxt.AddAddress(s, data, 0)
|
|
break
|
|
}
|
|
|
|
value &= 0xff
|
|
ctxt.AddInt(s, 1, value)
|
|
p := data.([]byte)[:value]
|
|
ctxt.AddBytes(s, p)
|
|
|
|
case DW_FORM_block2: // block
|
|
value &= 0xffff
|
|
|
|
ctxt.AddInt(s, 2, value)
|
|
p := data.([]byte)[:value]
|
|
ctxt.AddBytes(s, p)
|
|
|
|
case DW_FORM_block4: // block
|
|
value &= 0xffffffff
|
|
|
|
ctxt.AddInt(s, 4, value)
|
|
p := data.([]byte)[:value]
|
|
ctxt.AddBytes(s, p)
|
|
|
|
case DW_FORM_block: // block
|
|
Uleb128put(ctxt, s, value)
|
|
|
|
p := data.([]byte)[:value]
|
|
ctxt.AddBytes(s, p)
|
|
|
|
case DW_FORM_data1: // constant
|
|
ctxt.AddInt(s, 1, value)
|
|
|
|
case DW_FORM_data2: // constant
|
|
ctxt.AddInt(s, 2, value)
|
|
|
|
case DW_FORM_data4: // constant, {line,loclist,mac,rangelist}ptr
|
|
if cls == DW_CLS_PTR { // DW_AT_stmt_list and DW_AT_ranges
|
|
ctxt.AddDWARFAddrSectionOffset(s, data, value)
|
|
break
|
|
}
|
|
ctxt.AddInt(s, 4, value)
|
|
|
|
case DW_FORM_data8: // constant, {line,loclist,mac,rangelist}ptr
|
|
ctxt.AddInt(s, 8, value)
|
|
|
|
case DW_FORM_sdata: // constant
|
|
Sleb128put(ctxt, s, value)
|
|
|
|
case DW_FORM_udata: // constant
|
|
Uleb128put(ctxt, s, value)
|
|
|
|
case DW_FORM_string: // string
|
|
str := data.(string)
|
|
ctxt.AddString(s, str)
|
|
// TODO(ribrdb): verify padded strings are never used and remove this
|
|
for i := int64(len(str)); i < value; i++ {
|
|
ctxt.AddInt(s, 1, 0)
|
|
}
|
|
|
|
case DW_FORM_flag: // flag
|
|
if value != 0 {
|
|
ctxt.AddInt(s, 1, 1)
|
|
} else {
|
|
ctxt.AddInt(s, 1, 0)
|
|
}
|
|
|
|
// As of DWARF 3 the ref_addr is always 32 bits, unless emitting a large
|
|
// (> 4 GB of debug info aka "64-bit") unit, which we don't implement.
|
|
case DW_FORM_ref_addr: // reference to a DIE in the .info section
|
|
fallthrough
|
|
case DW_FORM_sec_offset: // offset into a DWARF section other than .info
|
|
if data == nil {
|
|
return fmt.Errorf("dwarf: null reference in %d", abbrev)
|
|
}
|
|
ctxt.AddDWARFAddrSectionOffset(s, data, value)
|
|
|
|
case DW_FORM_ref1, // reference within the compilation unit
|
|
DW_FORM_ref2, // reference
|
|
DW_FORM_ref4, // reference
|
|
DW_FORM_ref8, // reference
|
|
DW_FORM_ref_udata, // reference
|
|
|
|
DW_FORM_strp, // string
|
|
DW_FORM_indirect: // (see Section 7.5.3)
|
|
fallthrough
|
|
default:
|
|
return fmt.Errorf("dwarf: unsupported attribute form %d / class %d", form, cls)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// PutAttrs writes the attributes for a DIE to symbol 's'.
|
|
//
|
|
// Note that we can (and do) add arbitrary attributes to a DIE, but
|
|
// only the ones actually listed in the Abbrev will be written out.
|
|
func PutAttrs(ctxt Context, s Sym, abbrev int, attr *DWAttr) {
|
|
abbrevs := Abbrevs()
|
|
Outer:
|
|
for _, f := range abbrevs[abbrev].attr {
|
|
for ap := attr; ap != nil; ap = ap.Link {
|
|
if ap.Atr == f.attr {
|
|
putattr(ctxt, s, abbrev, int(f.form), int(ap.Cls), ap.Value, ap.Data)
|
|
continue Outer
|
|
}
|
|
}
|
|
|
|
putattr(ctxt, s, abbrev, int(f.form), 0, 0, nil)
|
|
}
|
|
}
|
|
|
|
// HasChildren reports whether 'die' uses an abbrev that supports children.
|
|
func HasChildren(die *DWDie) bool {
|
|
abbrevs := Abbrevs()
|
|
return abbrevs[die.Abbrev].children != 0
|
|
}
|
|
|
|
// PutIntConst writes a DIE for an integer constant
|
|
func PutIntConst(ctxt Context, info, typ Sym, name string, val int64) {
|
|
Uleb128put(ctxt, info, DW_ABRV_INT_CONSTANT)
|
|
putattr(ctxt, info, DW_ABRV_INT_CONSTANT, DW_FORM_string, DW_CLS_STRING, int64(len(name)), name)
|
|
putattr(ctxt, info, DW_ABRV_INT_CONSTANT, DW_FORM_ref_addr, DW_CLS_REFERENCE, 0, typ)
|
|
putattr(ctxt, info, DW_ABRV_INT_CONSTANT, DW_FORM_sdata, DW_CLS_CONSTANT, val, nil)
|
|
}
|
|
|
|
// PutBasedRanges writes a range table to sym. All addresses in ranges are
|
|
// relative to some base address, which must be arranged by the caller
|
|
// (e.g., with a DW_AT_low_pc attribute, or in a BASE-prefixed range).
|
|
func PutBasedRanges(ctxt Context, sym Sym, ranges []Range) {
|
|
ps := ctxt.PtrSize()
|
|
// Write ranges.
|
|
for _, r := range ranges {
|
|
ctxt.AddInt(sym, ps, r.Start)
|
|
ctxt.AddInt(sym, ps, r.End)
|
|
}
|
|
// Write trailer.
|
|
ctxt.AddInt(sym, ps, 0)
|
|
ctxt.AddInt(sym, ps, 0)
|
|
}
|
|
|
|
// PutRanges writes a range table to s.Ranges.
|
|
// All addresses in ranges are relative to s.base.
|
|
func (s *FnState) PutRanges(ctxt Context, ranges []Range) {
|
|
ps := ctxt.PtrSize()
|
|
sym, base := s.Ranges, s.StartPC
|
|
|
|
if s.UseBASEntries {
|
|
// Using a Base Address Selection Entry reduces the number of relocations, but
|
|
// this is not done on macOS because it is not supported by dsymutil/dwarfdump/lldb
|
|
ctxt.AddInt(sym, ps, -1)
|
|
ctxt.AddAddress(sym, base, 0)
|
|
PutBasedRanges(ctxt, sym, ranges)
|
|
return
|
|
}
|
|
|
|
// Write ranges full of relocations
|
|
for _, r := range ranges {
|
|
ctxt.AddCURelativeAddress(sym, base, r.Start)
|
|
ctxt.AddCURelativeAddress(sym, base, r.End)
|
|
}
|
|
// Write trailer.
|
|
ctxt.AddInt(sym, ps, 0)
|
|
ctxt.AddInt(sym, ps, 0)
|
|
}
|
|
|
|
// Return TRUE if the inlined call in the specified slot is empty,
|
|
// meaning it has a zero-length range (no instructions), and all
|
|
// of its children are empty.
|
|
func isEmptyInlinedCall(slot int, calls *InlCalls) bool {
|
|
ic := &calls.Calls[slot]
|
|
if ic.InlIndex == -2 {
|
|
return true
|
|
}
|
|
live := false
|
|
for _, k := range ic.Children {
|
|
if !isEmptyInlinedCall(k, calls) {
|
|
live = true
|
|
}
|
|
}
|
|
if len(ic.Ranges) > 0 {
|
|
live = true
|
|
}
|
|
if !live {
|
|
ic.InlIndex = -2
|
|
}
|
|
return !live
|
|
}
|
|
|
|
// Slot -1: return top-level inlines
|
|
// Slot >= 0: return children of that slot
|
|
func inlChildren(slot int, calls *InlCalls) []int {
|
|
var kids []int
|
|
if slot != -1 {
|
|
for _, k := range calls.Calls[slot].Children {
|
|
if !isEmptyInlinedCall(k, calls) {
|
|
kids = append(kids, k)
|
|
}
|
|
}
|
|
} else {
|
|
for k := 0; k < len(calls.Calls); k += 1 {
|
|
if calls.Calls[k].Root && !isEmptyInlinedCall(k, calls) {
|
|
kids = append(kids, k)
|
|
}
|
|
}
|
|
}
|
|
return kids
|
|
}
|
|
|
|
func inlinedVarTable(inlcalls *InlCalls) map[*Var]bool {
|
|
vars := make(map[*Var]bool)
|
|
for _, ic := range inlcalls.Calls {
|
|
for _, v := range ic.InlVars {
|
|
vars[v] = true
|
|
}
|
|
}
|
|
return vars
|
|
}
|
|
|
|
// The s.Scopes slice contains variables were originally part of the
|
|
// function being emitted, as well as variables that were imported
|
|
// from various callee functions during the inlining process. This
|
|
// function prunes out any variables from the latter category (since
|
|
// they will be emitted as part of DWARF inlined_subroutine DIEs) and
|
|
// then generates scopes for vars in the former category.
|
|
func putPrunedScopes(ctxt Context, s *FnState, fnabbrev int) error {
|
|
if len(s.Scopes) == 0 {
|
|
return nil
|
|
}
|
|
scopes := make([]Scope, len(s.Scopes), len(s.Scopes))
|
|
pvars := inlinedVarTable(&s.InlCalls)
|
|
for k, s := range s.Scopes {
|
|
var pruned Scope = Scope{Parent: s.Parent, Ranges: s.Ranges}
|
|
for i := 0; i < len(s.Vars); i++ {
|
|
_, found := pvars[s.Vars[i]]
|
|
if !found {
|
|
pruned.Vars = append(pruned.Vars, s.Vars[i])
|
|
}
|
|
}
|
|
sort.Sort(byChildIndex(pruned.Vars))
|
|
scopes[k] = pruned
|
|
}
|
|
var encbuf [20]byte
|
|
if putscope(ctxt, s, scopes, 0, fnabbrev, encbuf[:0]) < int32(len(scopes)) {
|
|
return errors.New("multiple toplevel scopes")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Emit DWARF attributes and child DIEs for an 'abstract' subprogram.
|
|
// The abstract subprogram DIE for a function contains its
|
|
// location-independent attributes (name, type, etc). Other instances
|
|
// of the function (any inlined copy of it, or the single out-of-line
|
|
// 'concrete' instance) will contain a pointer back to this abstract
|
|
// DIE (as a space-saving measure, so that name/type etc doesn't have
|
|
// to be repeated for each inlined copy).
|
|
func PutAbstractFunc(ctxt Context, s *FnState) error {
|
|
|
|
if logDwarf {
|
|
ctxt.Logf("PutAbstractFunc(%v)\n", s.Absfn)
|
|
}
|
|
|
|
abbrev := DW_ABRV_FUNCTION_ABSTRACT
|
|
Uleb128put(ctxt, s.Absfn, int64(abbrev))
|
|
|
|
fullname := s.Name
|
|
if strings.HasPrefix(s.Name, "\"\".") {
|
|
// Generate a fully qualified name for the function in the
|
|
// abstract case. This is so as to avoid the need for the
|
|
// linker to process the DIE with patchDWARFName(); we can't
|
|
// allow the name attribute of an abstract subprogram DIE to
|
|
// be rewritten, since it would change the offsets of the
|
|
// child DIEs (which we're relying on in order for abstract
|
|
// origin references to work).
|
|
fullname = objabi.PathToPrefix(s.Importpath) + "." + s.Name[3:]
|
|
}
|
|
putattr(ctxt, s.Absfn, abbrev, DW_FORM_string, DW_CLS_STRING, int64(len(fullname)), fullname)
|
|
|
|
// DW_AT_inlined value
|
|
putattr(ctxt, s.Absfn, abbrev, DW_FORM_data1, DW_CLS_CONSTANT, int64(DW_INL_inlined), nil)
|
|
|
|
var ev int64
|
|
if s.External {
|
|
ev = 1
|
|
}
|
|
putattr(ctxt, s.Absfn, abbrev, DW_FORM_flag, DW_CLS_FLAG, ev, 0)
|
|
|
|
// Child variables (may be empty)
|
|
var flattened []*Var
|
|
|
|
// This slice will hold the offset in bytes for each child var DIE
|
|
// with respect to the start of the parent subprogram DIE.
|
|
var offsets []int32
|
|
|
|
// Scopes/vars
|
|
if len(s.Scopes) > 0 {
|
|
// For abstract subprogram DIEs we want to flatten out scope info:
|
|
// lexical scope DIEs contain range and/or hi/lo PC attributes,
|
|
// which we explicitly don't want for the abstract subprogram DIE.
|
|
pvars := inlinedVarTable(&s.InlCalls)
|
|
for _, scope := range s.Scopes {
|
|
for i := 0; i < len(scope.Vars); i++ {
|
|
_, found := pvars[scope.Vars[i]]
|
|
if found || !scope.Vars[i].IsInAbstract {
|
|
continue
|
|
}
|
|
flattened = append(flattened, scope.Vars[i])
|
|
}
|
|
}
|
|
if len(flattened) > 0 {
|
|
sort.Sort(byChildIndex(flattened))
|
|
|
|
if logDwarf {
|
|
ctxt.Logf("putAbstractScope(%v): vars:", s.Info)
|
|
for i, v := range flattened {
|
|
ctxt.Logf(" %d:%s", i, v.Name)
|
|
}
|
|
ctxt.Logf("\n")
|
|
}
|
|
|
|
// This slice will hold the offset in bytes for each child
|
|
// variable DIE with respect to the start of the parent
|
|
// subprogram DIE.
|
|
for _, v := range flattened {
|
|
offsets = append(offsets, int32(ctxt.CurrentOffset(s.Absfn)))
|
|
putAbstractVar(ctxt, s.Absfn, v)
|
|
}
|
|
}
|
|
}
|
|
ctxt.RecordChildDieOffsets(s.Absfn, flattened, offsets)
|
|
|
|
Uleb128put(ctxt, s.Absfn, 0)
|
|
return nil
|
|
}
|
|
|
|
// Emit DWARF attributes and child DIEs for an inlined subroutine. The
|
|
// first attribute of an inlined subroutine DIE is a reference back to
|
|
// its corresponding 'abstract' DIE (containing location-independent
|
|
// attributes such as name, type, etc). Inlined subroutine DIEs can
|
|
// have other inlined subroutine DIEs as children.
|
|
func PutInlinedFunc(ctxt Context, s *FnState, callersym Sym, callIdx int) error {
|
|
ic := s.InlCalls.Calls[callIdx]
|
|
callee := ic.AbsFunSym
|
|
|
|
abbrev := DW_ABRV_INLINED_SUBROUTINE_RANGES
|
|
if len(ic.Ranges) == 1 {
|
|
abbrev = DW_ABRV_INLINED_SUBROUTINE
|
|
}
|
|
Uleb128put(ctxt, s.Info, int64(abbrev))
|
|
|
|
if logDwarf {
|
|
ctxt.Logf("PutInlinedFunc(caller=%v,callee=%v,abbrev=%d)\n", callersym, callee, abbrev)
|
|
}
|
|
|
|
// Abstract origin.
|
|
putattr(ctxt, s.Info, abbrev, DW_FORM_ref_addr, DW_CLS_REFERENCE, 0, callee)
|
|
|
|
if abbrev == DW_ABRV_INLINED_SUBROUTINE_RANGES {
|
|
putattr(ctxt, s.Info, abbrev, DW_FORM_sec_offset, DW_CLS_PTR, s.Ranges.Length(ctxt), s.Ranges)
|
|
s.PutRanges(ctxt, ic.Ranges)
|
|
} else {
|
|
st := ic.Ranges[0].Start
|
|
en := ic.Ranges[0].End
|
|
putattr(ctxt, s.Info, abbrev, DW_FORM_addr, DW_CLS_ADDRESS, st, s.StartPC)
|
|
putattr(ctxt, s.Info, abbrev, DW_FORM_addr, DW_CLS_ADDRESS, en, s.StartPC)
|
|
}
|
|
|
|
// Emit call file, line attrs.
|
|
ctxt.AddFileRef(s.Info, ic.CallFile)
|
|
form := int(expandPseudoForm(DW_FORM_udata_pseudo))
|
|
putattr(ctxt, s.Info, abbrev, form, DW_CLS_CONSTANT, int64(ic.CallLine), nil)
|
|
|
|
// Variables associated with this inlined routine instance.
|
|
vars := ic.InlVars
|
|
sort.Sort(byChildIndex(vars))
|
|
inlIndex := ic.InlIndex
|
|
var encbuf [20]byte
|
|
for _, v := range vars {
|
|
if !v.IsInAbstract {
|
|
continue
|
|
}
|
|
putvar(ctxt, s, v, callee, abbrev, inlIndex, encbuf[:0])
|
|
}
|
|
|
|
// Children of this inline.
|
|
for _, sib := range inlChildren(callIdx, &s.InlCalls) {
|
|
absfn := s.InlCalls.Calls[sib].AbsFunSym
|
|
err := PutInlinedFunc(ctxt, s, absfn, sib)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
Uleb128put(ctxt, s.Info, 0)
|
|
return nil
|
|
}
|
|
|
|
// Emit DWARF attributes and child DIEs for a 'concrete' subprogram,
|
|
// meaning the out-of-line copy of a function that was inlined at some
|
|
// point during the compilation of its containing package. The first
|
|
// attribute for a concrete DIE is a reference to the 'abstract' DIE
|
|
// for the function (which holds location-independent attributes such
|
|
// as name, type), then the remainder of the attributes are specific
|
|
// to this instance (location, frame base, etc).
|
|
func PutConcreteFunc(ctxt Context, s *FnState) error {
|
|
if logDwarf {
|
|
ctxt.Logf("PutConcreteFunc(%v)\n", s.Info)
|
|
}
|
|
abbrev := DW_ABRV_FUNCTION_CONCRETE
|
|
Uleb128put(ctxt, s.Info, int64(abbrev))
|
|
|
|
// Abstract origin.
|
|
putattr(ctxt, s.Info, abbrev, DW_FORM_ref_addr, DW_CLS_REFERENCE, 0, s.Absfn)
|
|
|
|
// Start/end PC.
|
|
putattr(ctxt, s.Info, abbrev, DW_FORM_addr, DW_CLS_ADDRESS, 0, s.StartPC)
|
|
putattr(ctxt, s.Info, abbrev, DW_FORM_addr, DW_CLS_ADDRESS, s.Size, s.StartPC)
|
|
|
|
// cfa / frame base
|
|
putattr(ctxt, s.Info, abbrev, DW_FORM_block1, DW_CLS_BLOCK, 1, []byte{DW_OP_call_frame_cfa})
|
|
|
|
// Scopes
|
|
if err := putPrunedScopes(ctxt, s, abbrev); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Inlined subroutines.
|
|
for _, sib := range inlChildren(-1, &s.InlCalls) {
|
|
absfn := s.InlCalls.Calls[sib].AbsFunSym
|
|
err := PutInlinedFunc(ctxt, s, absfn, sib)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
Uleb128put(ctxt, s.Info, 0)
|
|
return nil
|
|
}
|
|
|
|
// Emit DWARF attributes and child DIEs for a subprogram. Here
|
|
// 'default' implies that the function in question was not inlined
|
|
// when its containing package was compiled (hence there is no need to
|
|
// emit an abstract version for it to use as a base for inlined
|
|
// routine records).
|
|
func PutDefaultFunc(ctxt Context, s *FnState) error {
|
|
if logDwarf {
|
|
ctxt.Logf("PutDefaultFunc(%v)\n", s.Info)
|
|
}
|
|
abbrev := DW_ABRV_FUNCTION
|
|
Uleb128put(ctxt, s.Info, int64(abbrev))
|
|
|
|
// Expand '"".' to import path.
|
|
name := s.Name
|
|
if s.Importpath != "" {
|
|
name = strings.Replace(name, "\"\".", objabi.PathToPrefix(s.Importpath)+".", -1)
|
|
}
|
|
|
|
putattr(ctxt, s.Info, DW_ABRV_FUNCTION, DW_FORM_string, DW_CLS_STRING, int64(len(name)), name)
|
|
putattr(ctxt, s.Info, abbrev, DW_FORM_addr, DW_CLS_ADDRESS, 0, s.StartPC)
|
|
putattr(ctxt, s.Info, abbrev, DW_FORM_addr, DW_CLS_ADDRESS, s.Size, s.StartPC)
|
|
putattr(ctxt, s.Info, abbrev, DW_FORM_block1, DW_CLS_BLOCK, 1, []byte{DW_OP_call_frame_cfa})
|
|
ctxt.AddFileRef(s.Info, s.Filesym)
|
|
|
|
var ev int64
|
|
if s.External {
|
|
ev = 1
|
|
}
|
|
putattr(ctxt, s.Info, abbrev, DW_FORM_flag, DW_CLS_FLAG, ev, 0)
|
|
|
|
// Scopes
|
|
if err := putPrunedScopes(ctxt, s, abbrev); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Inlined subroutines.
|
|
for _, sib := range inlChildren(-1, &s.InlCalls) {
|
|
absfn := s.InlCalls.Calls[sib].AbsFunSym
|
|
err := PutInlinedFunc(ctxt, s, absfn, sib)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
Uleb128put(ctxt, s.Info, 0)
|
|
return nil
|
|
}
|
|
|
|
func putscope(ctxt Context, s *FnState, scopes []Scope, curscope int32, fnabbrev int, encbuf []byte) int32 {
|
|
|
|
if logDwarf {
|
|
ctxt.Logf("putscope(%v,%d): vars:", s.Info, curscope)
|
|
for i, v := range scopes[curscope].Vars {
|
|
ctxt.Logf(" %d:%d:%s", i, v.ChildIndex, v.Name)
|
|
}
|
|
ctxt.Logf("\n")
|
|
}
|
|
|
|
for _, v := range scopes[curscope].Vars {
|
|
putvar(ctxt, s, v, s.Absfn, fnabbrev, -1, encbuf)
|
|
}
|
|
this := curscope
|
|
curscope++
|
|
for curscope < int32(len(scopes)) {
|
|
scope := scopes[curscope]
|
|
if scope.Parent != this {
|
|
return curscope
|
|
}
|
|
|
|
if len(scopes[curscope].Vars) == 0 {
|
|
curscope = putscope(ctxt, s, scopes, curscope, fnabbrev, encbuf)
|
|
continue
|
|
}
|
|
|
|
if len(scope.Ranges) == 1 {
|
|
Uleb128put(ctxt, s.Info, DW_ABRV_LEXICAL_BLOCK_SIMPLE)
|
|
putattr(ctxt, s.Info, DW_ABRV_LEXICAL_BLOCK_SIMPLE, DW_FORM_addr, DW_CLS_ADDRESS, scope.Ranges[0].Start, s.StartPC)
|
|
putattr(ctxt, s.Info, DW_ABRV_LEXICAL_BLOCK_SIMPLE, DW_FORM_addr, DW_CLS_ADDRESS, scope.Ranges[0].End, s.StartPC)
|
|
} else {
|
|
Uleb128put(ctxt, s.Info, DW_ABRV_LEXICAL_BLOCK_RANGES)
|
|
putattr(ctxt, s.Info, DW_ABRV_LEXICAL_BLOCK_RANGES, DW_FORM_sec_offset, DW_CLS_PTR, s.Ranges.Length(ctxt), s.Ranges)
|
|
|
|
s.PutRanges(ctxt, scope.Ranges)
|
|
}
|
|
|
|
curscope = putscope(ctxt, s, scopes, curscope, fnabbrev, encbuf)
|
|
|
|
Uleb128put(ctxt, s.Info, 0)
|
|
}
|
|
return curscope
|
|
}
|
|
|
|
// Given a default var abbrev code, select corresponding concrete code.
|
|
func concreteVarAbbrev(varAbbrev int) int {
|
|
switch varAbbrev {
|
|
case DW_ABRV_AUTO:
|
|
return DW_ABRV_AUTO_CONCRETE
|
|
case DW_ABRV_PARAM:
|
|
return DW_ABRV_PARAM_CONCRETE
|
|
case DW_ABRV_AUTO_LOCLIST:
|
|
return DW_ABRV_AUTO_CONCRETE_LOCLIST
|
|
case DW_ABRV_PARAM_LOCLIST:
|
|
return DW_ABRV_PARAM_CONCRETE_LOCLIST
|
|
default:
|
|
panic("should never happen")
|
|
}
|
|
}
|
|
|
|
// Pick the correct abbrev code for variable or parameter DIE.
|
|
func determineVarAbbrev(v *Var, fnabbrev int) (int, bool, bool) {
|
|
abbrev := v.Abbrev
|
|
|
|
// If the variable was entirely optimized out, don't emit a location list;
|
|
// convert to an inline abbreviation and emit an empty location.
|
|
missing := false
|
|
switch {
|
|
case abbrev == DW_ABRV_AUTO_LOCLIST && v.PutLocationList == nil:
|
|
missing = true
|
|
abbrev = DW_ABRV_AUTO
|
|
case abbrev == DW_ABRV_PARAM_LOCLIST && v.PutLocationList == nil:
|
|
missing = true
|
|
abbrev = DW_ABRV_PARAM
|
|
}
|
|
|
|
// Determine whether to use a concrete variable or regular variable DIE.
|
|
concrete := true
|
|
switch fnabbrev {
|
|
case DW_ABRV_FUNCTION:
|
|
concrete = false
|
|
break
|
|
case DW_ABRV_FUNCTION_CONCRETE:
|
|
// If we're emitting a concrete subprogram DIE and the variable
|
|
// in question is not part of the corresponding abstract function DIE,
|
|
// then use the default (non-concrete) abbrev for this param.
|
|
if !v.IsInAbstract {
|
|
concrete = false
|
|
}
|
|
case DW_ABRV_INLINED_SUBROUTINE, DW_ABRV_INLINED_SUBROUTINE_RANGES:
|
|
default:
|
|
panic("should never happen")
|
|
}
|
|
|
|
// Select proper abbrev based on concrete/non-concrete
|
|
if concrete {
|
|
abbrev = concreteVarAbbrev(abbrev)
|
|
}
|
|
|
|
return abbrev, missing, concrete
|
|
}
|
|
|
|
func abbrevUsesLoclist(abbrev int) bool {
|
|
switch abbrev {
|
|
case DW_ABRV_AUTO_LOCLIST, DW_ABRV_AUTO_CONCRETE_LOCLIST,
|
|
DW_ABRV_PARAM_LOCLIST, DW_ABRV_PARAM_CONCRETE_LOCLIST:
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
|
|
// Emit DWARF attributes for a variable belonging to an 'abstract' subprogram.
|
|
func putAbstractVar(ctxt Context, info Sym, v *Var) {
|
|
// Remap abbrev
|
|
abbrev := v.Abbrev
|
|
switch abbrev {
|
|
case DW_ABRV_AUTO, DW_ABRV_AUTO_LOCLIST:
|
|
abbrev = DW_ABRV_AUTO_ABSTRACT
|
|
case DW_ABRV_PARAM, DW_ABRV_PARAM_LOCLIST:
|
|
abbrev = DW_ABRV_PARAM_ABSTRACT
|
|
}
|
|
|
|
Uleb128put(ctxt, info, int64(abbrev))
|
|
putattr(ctxt, info, abbrev, DW_FORM_string, DW_CLS_STRING, int64(len(v.Name)), v.Name)
|
|
|
|
// Isreturn attribute if this is a param
|
|
if abbrev == DW_ABRV_PARAM_ABSTRACT {
|
|
var isReturn int64
|
|
if v.IsReturnValue {
|
|
isReturn = 1
|
|
}
|
|
putattr(ctxt, info, abbrev, DW_FORM_flag, DW_CLS_FLAG, isReturn, nil)
|
|
}
|
|
|
|
// Line
|
|
if abbrev != DW_ABRV_PARAM_ABSTRACT {
|
|
// See issue 23374 for more on why decl line is skipped for abs params.
|
|
putattr(ctxt, info, abbrev, DW_FORM_udata, DW_CLS_CONSTANT, int64(v.DeclLine), nil)
|
|
}
|
|
|
|
// Type
|
|
putattr(ctxt, info, abbrev, DW_FORM_ref_addr, DW_CLS_REFERENCE, 0, v.Type)
|
|
|
|
// Var has no children => no terminator
|
|
}
|
|
|
|
func putvar(ctxt Context, s *FnState, v *Var, absfn Sym, fnabbrev, inlIndex int, encbuf []byte) {
|
|
// Remap abbrev according to parent DIE abbrev
|
|
abbrev, missing, concrete := determineVarAbbrev(v, fnabbrev)
|
|
|
|
Uleb128put(ctxt, s.Info, int64(abbrev))
|
|
|
|
// Abstract origin for concrete / inlined case
|
|
if concrete {
|
|
// Here we are making a reference to a child DIE of an abstract
|
|
// function subprogram DIE. The child DIE has no LSym, so instead
|
|
// after the call to 'putattr' below we make a call to register
|
|
// the child DIE reference.
|
|
putattr(ctxt, s.Info, abbrev, DW_FORM_ref_addr, DW_CLS_REFERENCE, 0, absfn)
|
|
ctxt.RecordDclReference(s.Info, absfn, int(v.ChildIndex), inlIndex)
|
|
} else {
|
|
// Var name, line for abstract and default cases
|
|
n := v.Name
|
|
putattr(ctxt, s.Info, abbrev, DW_FORM_string, DW_CLS_STRING, int64(len(n)), n)
|
|
if abbrev == DW_ABRV_PARAM || abbrev == DW_ABRV_PARAM_LOCLIST || abbrev == DW_ABRV_PARAM_ABSTRACT {
|
|
var isReturn int64
|
|
if v.IsReturnValue {
|
|
isReturn = 1
|
|
}
|
|
putattr(ctxt, s.Info, abbrev, DW_FORM_flag, DW_CLS_FLAG, isReturn, nil)
|
|
}
|
|
putattr(ctxt, s.Info, abbrev, DW_FORM_udata, DW_CLS_CONSTANT, int64(v.DeclLine), nil)
|
|
putattr(ctxt, s.Info, abbrev, DW_FORM_ref_addr, DW_CLS_REFERENCE, 0, v.Type)
|
|
}
|
|
|
|
if abbrevUsesLoclist(abbrev) {
|
|
putattr(ctxt, s.Info, abbrev, DW_FORM_sec_offset, DW_CLS_PTR, s.Loc.Length(ctxt), s.Loc)
|
|
v.PutLocationList(s.Loc, s.StartPC)
|
|
} else {
|
|
loc := encbuf[:0]
|
|
switch {
|
|
case missing:
|
|
break // no location
|
|
case v.StackOffset == 0:
|
|
loc = append(loc, DW_OP_call_frame_cfa)
|
|
default:
|
|
loc = append(loc, DW_OP_fbreg)
|
|
loc = AppendSleb128(loc, int64(v.StackOffset))
|
|
}
|
|
putattr(ctxt, s.Info, abbrev, DW_FORM_block1, DW_CLS_BLOCK, int64(len(loc)), loc)
|
|
}
|
|
|
|
// Var has no children => no terminator
|
|
}
|
|
|
|
// VarsByOffset attaches the methods of sort.Interface to []*Var,
|
|
// sorting in increasing StackOffset.
|
|
type VarsByOffset []*Var
|
|
|
|
func (s VarsByOffset) Len() int { return len(s) }
|
|
func (s VarsByOffset) Less(i, j int) bool { return s[i].StackOffset < s[j].StackOffset }
|
|
func (s VarsByOffset) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
|
|
|
|
// byChildIndex implements sort.Interface for []*dwarf.Var by child index.
|
|
type byChildIndex []*Var
|
|
|
|
func (s byChildIndex) Len() int { return len(s) }
|
|
func (s byChildIndex) Less(i, j int) bool { return s[i].ChildIndex < s[j].ChildIndex }
|
|
func (s byChildIndex) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
|
|
|
|
// IsDWARFEnabledOnAIX returns true if DWARF is possible on the
|
|
// current extld.
|
|
// AIX ld doesn't support DWARF with -bnoobjreorder with version
|
|
// prior to 7.2.2.
|
|
func IsDWARFEnabledOnAIXLd(extld string) (bool, error) {
|
|
out, err := exec.Command(extld, "-Wl,-V").CombinedOutput()
|
|
if err != nil {
|
|
// The normal output should display ld version and
|
|
// then fails because ".main" is not defined:
|
|
// ld: 0711-317 ERROR: Undefined symbol: .main
|
|
if !bytes.Contains(out, []byte("0711-317")) {
|
|
return false, fmt.Errorf("%s -Wl,-V failed: %v\n%s", extld, err, out)
|
|
}
|
|
}
|
|
// gcc -Wl,-V output should be:
|
|
// /usr/bin/ld: LD X.X.X(date)
|
|
// ...
|
|
out = bytes.TrimPrefix(out, []byte("/usr/bin/ld: LD "))
|
|
vers := string(bytes.Split(out, []byte("("))[0])
|
|
subvers := strings.Split(vers, ".")
|
|
if len(subvers) != 3 {
|
|
return false, fmt.Errorf("cannot parse %s -Wl,-V (%s): %v\n", extld, out, err)
|
|
}
|
|
if v, err := strconv.Atoi(subvers[0]); err != nil || v < 7 {
|
|
return false, nil
|
|
} else if v > 7 {
|
|
return true, nil
|
|
}
|
|
if v, err := strconv.Atoi(subvers[1]); err != nil || v < 2 {
|
|
return false, nil
|
|
} else if v > 2 {
|
|
return true, nil
|
|
}
|
|
if v, err := strconv.Atoi(subvers[2]); err != nil || v < 2 {
|
|
return false, nil
|
|
}
|
|
return true, nil
|
|
}
|