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|
package builder
import (
"debug/elf"
"sort"
"strings"
)
// programSize contains size statistics per package of a compiled program.
type programSize struct {
Packages map[string]*packageSize
Sum *packageSize
Code uint64
Data uint64
BSS uint64
}
// sortedPackageNames returns the list of package names (ProgramSize.Packages)
// sorted alphabetically.
func (ps *programSize) sortedPackageNames() []string {
names := make([]string, 0, len(ps.Packages))
for name := range ps.Packages {
names = append(names, name)
}
sort.Strings(names)
return names
}
// packageSize contains the size of a package, calculated from the linked object
// file.
type packageSize struct {
Code uint64
ROData uint64
Data uint64
BSS uint64
}
// Flash usage in regular microcontrollers.
func (ps *packageSize) Flash() uint64 {
return ps.Code + ps.ROData + ps.Data
}
// Static RAM usage in regular microcontrollers.
func (ps *packageSize) RAM() uint64 {
return ps.Data + ps.BSS
}
type symbolList []elf.Symbol
func (l symbolList) Len() int {
return len(l)
}
func (l symbolList) Less(i, j int) bool {
bind_i := elf.ST_BIND(l[i].Info)
bind_j := elf.ST_BIND(l[j].Info)
if l[i].Value == l[j].Value && bind_i != elf.STB_WEAK && bind_j == elf.STB_WEAK {
// sort weak symbols after non-weak symbols
return true
}
return l[i].Value < l[j].Value
}
func (l symbolList) Swap(i, j int) {
l[i], l[j] = l[j], l[i]
}
// loadProgramSize calculate a program/data size breakdown of each package for a
// given ELF file.
func loadProgramSize(path string) (*programSize, error) {
file, err := elf.Open(path)
if err != nil {
return nil, err
}
defer file.Close()
var sumCode uint64
var sumData uint64
var sumBSS uint64
for _, section := range file.Sections {
if section.Flags&elf.SHF_ALLOC == 0 {
continue
}
if section.Type != elf.SHT_PROGBITS && section.Type != elf.SHT_NOBITS {
continue
}
if section.Name == ".stack" {
// HACK: this works around a bug in ld.lld from LLVM 10. The linker
// marks sections with no input symbols (such as is the case for the
// .stack section) as SHT_PROGBITS instead of SHT_NOBITS. While it
// doesn't affect the generated binaries (.hex and .bin), it does
// affect the reported size.
// https://bugs.llvm.org/show_bug.cgi?id=45336
// https://reviews.llvm.org/D76981
// It has been merged in master, but it has not (yet) been
// backported to the LLVM 10 release branch.
sumBSS += section.Size
} else if section.Type == elf.SHT_NOBITS {
sumBSS += section.Size
} else if section.Flags&elf.SHF_EXECINSTR != 0 {
sumCode += section.Size
} else if section.Flags&elf.SHF_WRITE != 0 {
sumData += section.Size
}
}
allSymbols, err := file.Symbols()
if err != nil {
return nil, err
}
symbols := make([]elf.Symbol, 0, len(allSymbols))
for _, symbol := range allSymbols {
symType := elf.ST_TYPE(symbol.Info)
if symbol.Size == 0 {
continue
}
if symType != elf.STT_FUNC && symType != elf.STT_OBJECT && symType != elf.STT_NOTYPE {
continue
}
if symbol.Section >= elf.SectionIndex(len(file.Sections)) {
continue
}
section := file.Sections[symbol.Section]
if section.Flags&elf.SHF_ALLOC == 0 {
continue
}
symbols = append(symbols, symbol)
}
sort.Sort(symbolList(symbols))
sizes := map[string]*packageSize{}
var lastSymbolValue uint64
for _, symbol := range symbols {
symType := elf.ST_TYPE(symbol.Info)
//bind := elf.ST_BIND(symbol.Info)
section := file.Sections[symbol.Section]
pkgName := "(bootstrap)"
symName := strings.TrimLeft(symbol.Name, "(*")
dot := strings.IndexByte(symName, '.')
if dot > 0 {
pkgName = symName[:dot]
}
pkgSize := sizes[pkgName]
if pkgSize == nil {
pkgSize = &packageSize{}
sizes[pkgName] = pkgSize
}
if lastSymbolValue != symbol.Value || lastSymbolValue == 0 {
if symType == elf.STT_FUNC {
pkgSize.Code += symbol.Size
} else if section.Flags&elf.SHF_WRITE != 0 {
if section.Type == elf.SHT_NOBITS {
pkgSize.BSS += symbol.Size
} else {
pkgSize.Data += symbol.Size
}
} else {
pkgSize.ROData += symbol.Size
}
}
lastSymbolValue = symbol.Value
}
sum := &packageSize{}
for _, pkg := range sizes {
sum.Code += pkg.Code
sum.ROData += pkg.ROData
sum.Data += pkg.Data
sum.BSS += pkg.BSS
}
return &programSize{Packages: sizes, Code: sumCode, Data: sumData, BSS: sumBSS, Sum: sum}, nil
}
|
