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path: root/src/cmd/cgo/out.go
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Diffstat (limited to 'src/cmd/cgo/out.go')
-rw-r--r--src/cmd/cgo/out.go524
1 files changed, 298 insertions, 226 deletions
diff --git a/src/cmd/cgo/out.go b/src/cmd/cgo/out.go
index 7cdf483f0..c3f9ae60b 100644
--- a/src/cmd/cgo/out.go
+++ b/src/cmd/cgo/out.go
@@ -5,6 +5,9 @@
package main
import (
+ "bytes"
+ "debug/elf"
+ "debug/macho"
"fmt"
"go/ast"
"go/printer"
@@ -13,30 +16,9 @@ import (
"strings"
)
-func creat(name string) *os.File {
- f, err := os.Open(name, os.O_WRONLY|os.O_CREAT|os.O_TRUNC, 0666)
- if err != nil {
- fatal("%s", err)
- }
- return f
-}
-
-func slashToUnderscore(c int) int {
- if c == '/' {
- c = '_'
- }
- return c
-}
-
// writeDefs creates output files to be compiled by 6g, 6c, and gcc.
// (The comments here say 6g and 6c but the code applies to the 8 and 5 tools too.)
-func (p *Prog) writeDefs() {
- pkgroot := os.Getenv("GOROOT") + "/pkg/" + os.Getenv("GOOS") + "_" + os.Getenv("GOARCH")
- path := p.PackagePath
- if !strings.HasPrefix(path, "/") {
- path = pkgroot + "/" + path
- }
-
+func (p *Package) writeDefs() {
// The path for the shared object is slash-free so that ELF loaders
// will treat it as a relative path. We rewrite slashes to underscores.
sopath := "cgo_" + strings.Map(slashToUnderscore, p.PackagePath)
@@ -48,229 +30,305 @@ func (p *Prog) writeDefs() {
fgo2 := creat("_cgo_gotypes.go")
fc := creat("_cgo_defun.c")
+ fm := creat("_cgo_main.c")
+
+ // Write C main file for using gcc to resolve imports.
+ fmt.Fprintf(fm, "int main() { return 0; }\n")
+ fmt.Fprintf(fm, "int crosscall2;\n\n")
// Write second Go output: definitions of _C_xxx.
// In a separate file so that the import of "unsafe" does not
// pollute the original file.
- fmt.Fprintf(fgo2, "// Created by cgo - DO NOT EDIT\n")
- fmt.Fprintf(fgo2, "package %s\n\n", p.Package)
+ fmt.Fprintf(fgo2, "// Created by cgo - DO NOT EDIT\n\n")
+ fmt.Fprintf(fgo2, "package %s\n\n", p.PackageName)
fmt.Fprintf(fgo2, "import \"unsafe\"\n\n")
+ fmt.Fprintf(fgo2, "import \"os\"\n\n")
+ fmt.Fprintf(fgo2, "import _ \"runtime/cgo\"\n\n")
fmt.Fprintf(fgo2, "type _ unsafe.Pointer\n\n")
+ fmt.Fprintf(fgo2, "func _Cerrno(dst *os.Error, x int) { *dst = os.Errno(x) }\n")
- for name, def := range p.Typedef {
+ for name, def := range typedef {
fmt.Fprintf(fgo2, "type %s ", name)
- printer.Fprint(fgo2, def)
+ printer.Fprint(fgo2, fset, def)
fmt.Fprintf(fgo2, "\n")
}
- fmt.Fprintf(fgo2, "type _C_void [0]byte\n")
+ fmt.Fprintf(fgo2, "type _Ctype_void [0]byte\n")
+
+ fmt.Fprintf(fc, cProlog)
+
+ var cVars []string
+ for _, n := range p.Name {
+ if n.Kind != "var" {
+ continue
+ }
+ cVars = append(cVars, n.C)
- fmt.Fprintf(fc, cProlog, soprefix, soprefix, soprefix, soprefix, soprefix)
+ fmt.Fprintf(fm, "extern char %s[];\n", n.C)
+ fmt.Fprintf(fm, "void *_cgohack_%s = %s;\n\n", n.C, n.C)
+
+ fmt.Fprintf(fc, "extern byte *%s;\n", n.C)
+ fmt.Fprintf(fc, "void *·%s = &%s;\n", n.Mangle, n.C)
+ fmt.Fprintf(fc, "\n")
- for name, def := range p.Vardef {
- fmt.Fprintf(fc, "#pragma dynimport ·_C_%s %s \"%s%s.so\"\n", name, name, soprefix, sopath)
- fmt.Fprintf(fgo2, "var _C_%s ", name)
- printer.Fprint(fgo2, &ast.StarExpr{X: def.Go})
+ fmt.Fprintf(fgo2, "var %s ", n.Mangle)
+ printer.Fprint(fgo2, fset, &ast.StarExpr{X: n.Type.Go})
fmt.Fprintf(fgo2, "\n")
}
fmt.Fprintf(fc, "\n")
- for name, value := range p.Constdef {
- fmt.Fprintf(fgo2, "const %s = %s\n", name, value)
- }
-
- for name, value := range p.Enumdef {
- fmt.Fprintf(fgo2, "const %s = %d\n", name, value)
+ for _, n := range p.Name {
+ if n.Const != "" {
+ fmt.Fprintf(fgo2, "const _Cconst_%s = %s\n", n.Go, n.Const)
+ }
}
fmt.Fprintf(fgo2, "\n")
- for name, def := range p.Funcdef {
- // Go func declaration.
- d := &ast.FuncDecl{
- Name: ast.NewIdent("_C_" + name),
- Type: def.Go,
+ for _, n := range p.Name {
+ if n.FuncType != nil {
+ p.writeDefsFunc(fc, fgo2, n, soprefix, sopath)
}
- printer.Fprint(fgo2, d)
- fmt.Fprintf(fgo2, "\n")
+ }
- if name == "CString" || name == "GoString" {
- // The builtins are already defined in the C prolog.
- continue
+ p.writeExports(fgo2, fc, fm)
+
+ fgo2.Close()
+ fc.Close()
+}
+
+func dynimport(obj string) (syms, imports []string) {
+ var f interface {
+ ImportedLibraries() ([]string, os.Error)
+ ImportedSymbols() ([]string, os.Error)
+ }
+ var isMacho bool
+ var err1, err2 os.Error
+ if f, err1 = elf.Open(obj); err1 != nil {
+ if f, err2 = macho.Open(obj); err2 != nil {
+ fatal("cannot parse %s as ELF (%v) or Mach-O (%v)", obj, err1, err2)
}
+ isMacho = true
+ }
- // Construct a gcc struct matching the 6c argument frame.
- // Assumes that in gcc, char is 1 byte, short 2 bytes, int 4 bytes, long long 8 bytes.
- // These assumptions are checked by the gccProlog.
- // Also assumes that 6c convention is to word-align the
- // input and output parameters.
- structType := "struct {\n"
- off := int64(0)
- npad := 0
- for i, t := range def.Params {
- if off%t.Align != 0 {
- pad := t.Align - off%t.Align
- structType += fmt.Sprintf("\t\tchar __pad%d[%d];\n", npad, pad)
- off += pad
- npad++
+ var err os.Error
+ syms, err = f.ImportedSymbols()
+ if err != nil {
+ fatal("cannot load dynamic symbols: %v", err)
+ }
+ if isMacho {
+ // remove leading _ that OS X insists on
+ for i, s := range syms {
+ if len(s) >= 2 && s[0] == '_' {
+ syms[i] = s[1:]
}
- structType += fmt.Sprintf("\t\t%s p%d;\n", t.C, i)
- off += t.Size
}
- if off%p.PtrSize != 0 {
- pad := p.PtrSize - off%p.PtrSize
- structType += fmt.Sprintf("\t\tchar __pad%d[%d];\n", npad, pad)
+ }
+
+ imports, err = f.ImportedLibraries()
+ if err != nil {
+ fatal("cannot load dynamic imports: %v", err)
+ }
+
+ return
+}
+
+// Construct a gcc struct matching the 6c argument frame.
+// Assumes that in gcc, char is 1 byte, short 2 bytes, int 4 bytes, long long 8 bytes.
+// These assumptions are checked by the gccProlog.
+// Also assumes that 6c convention is to word-align the
+// input and output parameters.
+func (p *Package) structType(n *Name) (string, int64) {
+ var buf bytes.Buffer
+ fmt.Fprint(&buf, "struct {\n")
+ off := int64(0)
+ for i, t := range n.FuncType.Params {
+ if off%t.Align != 0 {
+ pad := t.Align - off%t.Align
+ fmt.Fprintf(&buf, "\t\tchar __pad%d[%d];\n", off, pad)
off += pad
- npad++
- }
- if t := def.Result; t != nil {
- if off%t.Align != 0 {
- pad := t.Align - off%t.Align
- structType += fmt.Sprintf("\t\tchar __pad%d[%d];\n", npad, pad)
- off += pad
- npad++
- }
- structType += fmt.Sprintf("\t\t%s r;\n", t.C)
- off += t.Size
}
- if off%p.PtrSize != 0 {
- pad := p.PtrSize - off%p.PtrSize
- structType += fmt.Sprintf("\t\tchar __pad%d[%d];\n", npad, pad)
+ fmt.Fprintf(&buf, "\t\t%s p%d;\n", t.C, i)
+ off += t.Size
+ }
+ if off%p.PtrSize != 0 {
+ pad := p.PtrSize - off%p.PtrSize
+ fmt.Fprintf(&buf, "\t\tchar __pad%d[%d];\n", off, pad)
+ off += pad
+ }
+ if t := n.FuncType.Result; t != nil {
+ if off%t.Align != 0 {
+ pad := t.Align - off%t.Align
+ fmt.Fprintf(&buf, "\t\tchar __pad%d[%d];\n", off, pad)
off += pad
- npad++
}
- if len(def.Params) == 0 && def.Result == nil {
- structType += "\t\tchar unused;\n" // avoid empty struct
- off++
+ qual := ""
+ if t.C[len(t.C)-1] == '*' {
+ qual = "const "
}
- structType += "\t}"
- argSize := off
+ fmt.Fprintf(&buf, "\t\t%s%s r;\n", qual, t.C)
+ off += t.Size
+ }
+ if off%p.PtrSize != 0 {
+ pad := p.PtrSize - off%p.PtrSize
+ fmt.Fprintf(&buf, "\t\tchar __pad%d[%d];\n", off, pad)
+ off += pad
+ }
+ if n.AddError {
+ fmt.Fprint(&buf, "\t\tvoid *e[2]; /* os.Error */\n")
+ off += 2 * p.PtrSize
+ }
+ if off == 0 {
+ fmt.Fprintf(&buf, "\t\tchar unused;\n") // avoid empty struct
+ off++
+ }
+ fmt.Fprintf(&buf, "\t}")
+ return buf.String(), off
+}
- // C wrapper calls into gcc, passing a pointer to the argument frame.
- // Also emit #pragma to get a pointer to the gcc wrapper.
- fmt.Fprintf(fc, "#pragma dynimport _cgo_%s _cgo_%s \"%s%s.so\"\n", name, name, soprefix, sopath)
- fmt.Fprintf(fc, "void (*_cgo_%s)(void*);\n", name)
- fmt.Fprintf(fc, "\n")
- fmt.Fprintf(fc, "void\n")
- fmt.Fprintf(fc, "·_C_%s(struct{uint8 x[%d];}p)\n", name, argSize)
- fmt.Fprintf(fc, "{\n")
- fmt.Fprintf(fc, "\tcgocall(_cgo_%s, &p);\n", name)
- fmt.Fprintf(fc, "}\n")
- fmt.Fprintf(fc, "\n")
+func (p *Package) writeDefsFunc(fc, fgo2 *os.File, n *Name, soprefix, sopath string) {
+ name := n.Go
+ gtype := n.FuncType.Go
+ if n.AddError {
+ // Add "os.Error" to return type list.
+ // Type list is known to be 0 or 1 element - it's a C function.
+ err := &ast.Field{Type: ast.NewIdent("os.Error")}
+ l := gtype.Results.List
+ if len(l) == 0 {
+ l = []*ast.Field{err}
+ } else {
+ l = []*ast.Field{l[0], err}
+ }
+ t := new(ast.FuncType)
+ *t = *gtype
+ t.Results = &ast.FieldList{List: l}
+ gtype = t
}
- p.writeExports(fgo2, fc)
+ // Go func declaration.
+ d := &ast.FuncDecl{
+ Name: ast.NewIdent(n.Mangle),
+ Type: gtype,
+ }
+ printer.Fprint(fgo2, fset, d)
+ fmt.Fprintf(fgo2, "\n")
- fgo2.Close()
- fc.Close()
+ if name == "CString" || name == "GoString" || name == "GoStringN" {
+ // The builtins are already defined in the C prolog.
+ return
+ }
+
+ var argSize int64
+ _, argSize = p.structType(n)
+
+ // C wrapper calls into gcc, passing a pointer to the argument frame.
+ fmt.Fprintf(fc, "void _cgo%s%s(void*);\n", cPrefix, n.Mangle)
+ fmt.Fprintf(fc, "\n")
+ fmt.Fprintf(fc, "void\n")
+ fmt.Fprintf(fc, "·%s(struct{uint8 x[%d];}p)\n", n.Mangle, argSize)
+ fmt.Fprintf(fc, "{\n")
+ fmt.Fprintf(fc, "\truntime·cgocall(_cgo%s%s, &p);\n", cPrefix, n.Mangle)
+ if n.AddError {
+ // gcc leaves errno in first word of interface at end of p.
+ // check whether it is zero; if so, turn interface into nil.
+ // if not, turn interface into errno.
+ // Go init function initializes ·_Cerrno with an os.Errno
+ // for us to copy.
+ fmt.Fprintln(fc, ` {
+ int32 e;
+ void **v;
+ v = (void**)(&p+1) - 2; /* v = final two void* of p */
+ e = *(int32*)v;
+ v[0] = (void*)0xdeadbeef;
+ v[1] = (void*)0xdeadbeef;
+ if(e == 0) {
+ /* nil interface */
+ v[0] = 0;
+ v[1] = 0;
+ } else {
+ ·_Cerrno(v, e); /* fill in v as os.Error for errno e */
+ }
+ }`)
+ }
+ fmt.Fprintf(fc, "}\n")
+ fmt.Fprintf(fc, "\n")
}
// writeOutput creates stubs for a specific source file to be compiled by 6g
// (The comments here say 6g and 6c but the code applies to the 8 and 5 tools too.)
-func (p *Prog) writeOutput(srcfile string) {
+func (p *Package) writeOutput(f *File, srcfile string) {
base := srcfile
if strings.HasSuffix(base, ".go") {
base = base[0 : len(base)-3]
}
+ base = strings.Map(slashToUnderscore, base)
fgo1 := creat(base + ".cgo1.go")
fgcc := creat(base + ".cgo2.c")
+ p.GoFiles = append(p.GoFiles, base+".cgo1.go")
+ p.GccFiles = append(p.GccFiles, base+".cgo2.c")
+
// Write Go output: Go input with rewrites of C.xxx to _C_xxx.
- fmt.Fprintf(fgo1, "// Created by cgo - DO NOT EDIT\n")
+ fmt.Fprintf(fgo1, "// Created by cgo - DO NOT EDIT\n\n")
fmt.Fprintf(fgo1, "//line %s:1\n", srcfile)
- printer.Fprint(fgo1, p.AST)
+ printer.Fprint(fgo1, fset, f.AST)
// While we process the vars and funcs, also write 6c and gcc output.
// Gcc output starts with the preamble.
- fmt.Fprintf(fgcc, "%s\n", p.Preamble)
+ fmt.Fprintf(fgcc, "%s\n", f.Preamble)
fmt.Fprintf(fgcc, "%s\n", gccProlog)
- for name, def := range p.Funcdef {
- _, ok := p.OutDefs[name]
- if name == "CString" || name == "GoString" || ok {
- // The builtins are already defined in the C prolog, and we don't
- // want to duplicate function definitions we've already done.
- continue
- }
- p.OutDefs[name] = true
-
- // Construct a gcc struct matching the 6c argument frame.
- // Assumes that in gcc, char is 1 byte, short 2 bytes, int 4 bytes, long long 8 bytes.
- // These assumptions are checked by the gccProlog.
- // Also assumes that 6c convention is to word-align the
- // input and output parameters.
- structType := "struct {\n"
- off := int64(0)
- npad := 0
- for i, t := range def.Params {
- if off%t.Align != 0 {
- pad := t.Align - off%t.Align
- structType += fmt.Sprintf("\t\tchar __pad%d[%d];\n", npad, pad)
- off += pad
- npad++
- }
- structType += fmt.Sprintf("\t\t%s p%d;\n", t.C, i)
- off += t.Size
+ for _, n := range f.Name {
+ if n.FuncType != nil {
+ p.writeOutputFunc(fgcc, n)
}
- if off%p.PtrSize != 0 {
- pad := p.PtrSize - off%p.PtrSize
- structType += fmt.Sprintf("\t\tchar __pad%d[%d];\n", npad, pad)
- off += pad
- npad++
- }
- if t := def.Result; t != nil {
- if off%t.Align != 0 {
- pad := t.Align - off%t.Align
- structType += fmt.Sprintf("\t\tchar __pad%d[%d];\n", npad, pad)
- off += pad
- npad++
- }
- structType += fmt.Sprintf("\t\t%s r;\n", t.C)
- off += t.Size
- }
- if off%p.PtrSize != 0 {
- pad := p.PtrSize - off%p.PtrSize
- structType += fmt.Sprintf("\t\tchar __pad%d[%d];\n", npad, pad)
- off += pad
- npad++
- }
- if len(def.Params) == 0 && def.Result == nil {
- structType += "\t\tchar unused;\n" // avoid empty struct
- off++
- }
- structType += "\t}"
-
- // Gcc wrapper unpacks the C argument struct
- // and calls the actual C function.
- fmt.Fprintf(fgcc, "void\n")
- fmt.Fprintf(fgcc, "_cgo_%s(void *v)\n", name)
- fmt.Fprintf(fgcc, "{\n")
- fmt.Fprintf(fgcc, "\t%s *a = v;\n", structType)
- fmt.Fprintf(fgcc, "\t")
- if def.Result != nil {
- fmt.Fprintf(fgcc, "a->r = ")
- }
- fmt.Fprintf(fgcc, "%s(", name)
- for i := range def.Params {
- if i > 0 {
- fmt.Fprintf(fgcc, ", ")
- }
- fmt.Fprintf(fgcc, "a->p%d", i)
- }
- fmt.Fprintf(fgcc, ");\n")
- fmt.Fprintf(fgcc, "}\n")
- fmt.Fprintf(fgcc, "\n")
}
fgo1.Close()
fgcc.Close()
}
-// Write out the various stubs we need to support functions exported
-// from Go so that they are callable from C.
-func (p *Prog) writeExports(fgo2, fc *os.File) {
- if len(p.ExpFuncs) == 0 {
+func (p *Package) writeOutputFunc(fgcc *os.File, n *Name) {
+ name := n.Mangle
+ if name == "_Cfunc_CString" || name == "_Cfunc_GoString" || name == "_Cfunc_GoStringN" || p.Written[name] {
+ // The builtins are already defined in the C prolog, and we don't
+ // want to duplicate function definitions we've already done.
return
}
+ p.Written[name] = true
+
+ ctype, _ := p.structType(n)
+
+ // Gcc wrapper unpacks the C argument struct
+ // and calls the actual C function.
+ fmt.Fprintf(fgcc, "void\n")
+ fmt.Fprintf(fgcc, "_cgo%s%s(void *v)\n", cPrefix, n.Mangle)
+ fmt.Fprintf(fgcc, "{\n")
+ if n.AddError {
+ fmt.Fprintf(fgcc, "\tint e;\n") // assuming 32 bit (see comment above structType)
+ fmt.Fprintf(fgcc, "\terrno = 0;\n")
+ }
+ fmt.Fprintf(fgcc, "\t%s *a = v;\n", ctype)
+ fmt.Fprintf(fgcc, "\t")
+ if n.FuncType.Result != nil {
+ fmt.Fprintf(fgcc, "a->r = ")
+ }
+ fmt.Fprintf(fgcc, "%s(", n.C)
+ for i := range n.FuncType.Params {
+ if i > 0 {
+ fmt.Fprintf(fgcc, ", ")
+ }
+ fmt.Fprintf(fgcc, "a->p%d", i)
+ }
+ fmt.Fprintf(fgcc, ");\n")
+ if n.AddError {
+ fmt.Fprintf(fgcc, "\t*(int*)(a->e) = errno;\n")
+ }
+ fmt.Fprintf(fgcc, "}\n")
+ fmt.Fprintf(fgcc, "\n")
+}
+// Write out the various stubs we need to support functions exported
+// from Go so that they are callable from C.
+func (p *Package) writeExports(fgo2, fc, fm *os.File) {
fgcc := creat("_cgo_export.c")
fgcch := creat("_cgo_export.h")
@@ -280,17 +338,17 @@ func (p *Prog) writeExports(fgo2, fc *os.File) {
fmt.Fprintf(fgcc, "/* Created by cgo - DO NOT EDIT. */\n")
fmt.Fprintf(fgcc, "#include \"_cgo_export.h\"\n")
- for _, exp := range p.ExpFuncs {
+ for _, exp := range p.ExpFunc {
fn := exp.Func
// Construct a gcc struct matching the 6c argument and
// result frame.
- structType := "struct {\n"
+ ctype := "struct {\n"
off := int64(0)
npad := 0
if fn.Recv != nil {
t := p.cgoType(fn.Recv.List[0].Type)
- structType += fmt.Sprintf("\t\t%s recv;\n", t.C)
+ ctype += fmt.Sprintf("\t\t%s recv;\n", t.C)
off += t.Size
}
fntype := fn.Type
@@ -299,16 +357,16 @@ func (p *Prog) writeExports(fgo2, fc *os.File) {
t := p.cgoType(atype)
if off%t.Align != 0 {
pad := t.Align - off%t.Align
- structType += fmt.Sprintf("\t\tchar __pad%d[%d];\n", npad, pad)
+ ctype += fmt.Sprintf("\t\tchar __pad%d[%d];\n", npad, pad)
off += pad
npad++
}
- structType += fmt.Sprintf("\t\t%s p%d;\n", t.C, i)
+ ctype += fmt.Sprintf("\t\t%s p%d;\n", t.C, i)
off += t.Size
})
if off%p.PtrSize != 0 {
pad := p.PtrSize - off%p.PtrSize
- structType += fmt.Sprintf("\t\tchar __pad%d[%d];\n", npad, pad)
+ ctype += fmt.Sprintf("\t\tchar __pad%d[%d];\n", npad, pad)
off += pad
npad++
}
@@ -317,24 +375,24 @@ func (p *Prog) writeExports(fgo2, fc *os.File) {
t := p.cgoType(atype)
if off%t.Align != 0 {
pad := t.Align - off%t.Align
- structType += fmt.Sprintf("\t\tchar __pad%d[%d]\n", npad, pad)
+ ctype += fmt.Sprintf("\t\tchar __pad%d[%d]\n", npad, pad)
off += pad
npad++
}
- structType += fmt.Sprintf("\t\t%s r%d;\n", t.C, i)
+ ctype += fmt.Sprintf("\t\t%s r%d;\n", t.C, i)
off += t.Size
})
if off%p.PtrSize != 0 {
pad := p.PtrSize - off%p.PtrSize
- structType += fmt.Sprintf("\t\tchar __pad%d[%d];\n", npad, pad)
+ ctype += fmt.Sprintf("\t\tchar __pad%d[%d];\n", npad, pad)
off += pad
npad++
}
- if structType == "struct {\n" {
- structType += "\t\tchar unused;\n" // avoid empty struct
+ if ctype == "struct {\n" {
+ ctype += "\t\tchar unused;\n" // avoid empty struct
off++
}
- structType += "\t}"
+ ctype += "\t}"
// Get the return type of the wrapper function
// compiled by gcc.
@@ -370,10 +428,10 @@ func (p *Prog) writeExports(fgo2, fc *os.File) {
s += ")"
fmt.Fprintf(fgcch, "\nextern %s;\n", s)
- fmt.Fprintf(fgcc, "extern _cgoexp_%s(void *, int);\n", exp.ExpName)
+ fmt.Fprintf(fgcc, "extern _cgoexp%s_%s(void *, int);\n", cPrefix, exp.ExpName)
fmt.Fprintf(fgcc, "\n%s\n", s)
fmt.Fprintf(fgcc, "{\n")
- fmt.Fprintf(fgcc, "\t%s a;\n", structType)
+ fmt.Fprintf(fgcc, "\t%s a;\n", ctype)
if gccResult != "void" && (len(fntype.Results.List) > 1 || len(fntype.Results.List[0].Names) > 1) {
fmt.Fprintf(fgcc, "\t%s r;\n", gccResult)
}
@@ -384,7 +442,7 @@ func (p *Prog) writeExports(fgo2, fc *os.File) {
func(i int, atype ast.Expr) {
fmt.Fprintf(fgcc, "\ta.p%d = p%d;\n", i, i)
})
- fmt.Fprintf(fgcc, "\tcrosscall2(_cgoexp_%s, &a, (int) sizeof a);\n", exp.ExpName)
+ fmt.Fprintf(fgcc, "\tcrosscall2(_cgoexp%s_%s, &a, (int) sizeof a);\n", cPrefix, exp.ExpName)
if gccResult != "void" {
if len(fntype.Results.List) == 1 && len(fntype.Results.List[0].Names) <= 1 {
fmt.Fprintf(fgcc, "\treturn a.r0;\n")
@@ -399,27 +457,28 @@ func (p *Prog) writeExports(fgo2, fc *os.File) {
fmt.Fprintf(fgcc, "}\n")
// Build the wrapper function compiled by 6c/8c
- goname := exp.Func.Name.Name()
+ goname := exp.Func.Name.Name
if fn.Recv != nil {
- goname = "_cgoexpwrap_" + fn.Recv.List[0].Names[0].Name() + "_" + goname
+ goname = "_cgoexpwrap" + cPrefix + "_" + fn.Recv.List[0].Names[0].Name + "_" + goname
}
- fmt.Fprintf(fc, "#pragma dynexport _cgoexp_%s _cgoexp_%s\n", exp.ExpName, exp.ExpName)
fmt.Fprintf(fc, "extern void ·%s();\n", goname)
fmt.Fprintf(fc, "\nvoid\n")
- fmt.Fprintf(fc, "_cgoexp_%s(void *a, int32 n)\n", exp.ExpName)
+ fmt.Fprintf(fc, "_cgoexp%s_%s(void *a, int32 n)\n", cPrefix, exp.ExpName)
fmt.Fprintf(fc, "{\n")
- fmt.Fprintf(fc, "\tcgocallback(·%s, a, n);\n", goname)
+ fmt.Fprintf(fc, "\truntime·cgocallback(·%s, a, n);\n", goname)
fmt.Fprintf(fc, "}\n")
+ fmt.Fprintf(fm, "int _cgoexp%s_%s;\n", cPrefix, exp.ExpName)
+
// Calling a function with a receiver from C requires
// a Go wrapper function.
if fn.Recv != nil {
fmt.Fprintf(fgo2, "func %s(recv ", goname)
- printer.Fprint(fgo2, fn.Recv.List[0].Type)
+ printer.Fprint(fgo2, fset, fn.Recv.List[0].Type)
forFieldList(fntype.Params,
func(i int, atype ast.Expr) {
- fmt.Fprintf(fgo2, ", p%d", i)
- printer.Fprint(fgo2, atype)
+ fmt.Fprintf(fgo2, ", p%d ", i)
+ printer.Fprint(fgo2, fset, atype)
})
fmt.Fprintf(fgo2, ")")
if gccResult != "void" {
@@ -429,7 +488,7 @@ func (p *Prog) writeExports(fgo2, fc *os.File) {
if i > 0 {
fmt.Fprint(fgo2, ", ")
}
- printer.Fprint(fgo2, atype)
+ printer.Fprint(fgo2, fset, atype)
})
fmt.Fprint(fgo2, ")")
}
@@ -493,7 +552,7 @@ var goTypes = map[string]*Type{
}
// Map an ast type to a Type.
-func (p *Prog) cgoType(e ast.Expr) *Type {
+func (p *Package) cgoType(e ast.Expr) *Type {
switch t := e.(type) {
case *ast.StarExpr:
x := p.cgoType(t.X)
@@ -515,7 +574,7 @@ func (p *Prog) cgoType(e ast.Expr) *Type {
case *ast.Ident:
// Look up the type in the top level declarations.
// TODO: Handle types defined within a function.
- for _, d := range p.AST.Decls {
+ for _, d := range p.Decl {
gd, ok := d.(*ast.GenDecl)
if !ok || gd.Tok != token.TYPE {
continue
@@ -525,30 +584,35 @@ func (p *Prog) cgoType(e ast.Expr) *Type {
if !ok {
continue
}
- if ts.Name.Name() == t.Name() {
+ if ts.Name.Name == t.Name {
return p.cgoType(ts.Type)
}
}
}
- for name, def := range p.Typedef {
- if name == t.Name() {
+ for name, def := range typedef {
+ if name == t.Name {
return p.cgoType(def)
}
}
- if t.Name() == "uintptr" {
+ if t.Name == "uintptr" {
return &Type{Size: p.PtrSize, Align: p.PtrSize, C: "uintptr"}
}
- if t.Name() == "string" {
+ if t.Name == "string" {
return &Type{Size: p.PtrSize + 4, Align: p.PtrSize, C: "GoString"}
}
- if r, ok := goTypes[t.Name()]; ok {
+ if r, ok := goTypes[t.Name]; ok {
if r.Align > p.PtrSize {
r.Align = p.PtrSize
}
return r
}
+ case *ast.SelectorExpr:
+ id, ok := t.X.(*ast.Ident)
+ if ok && id.Name == "unsafe" && t.Sel.Name == "Pointer" {
+ return &Type{Size: p.PtrSize, Align: p.PtrSize, C: "void*"}
+ }
}
- error(e.Pos(), "unrecognized Go type %v", e)
+ error(e.Pos(), "unrecognized Go type %T", e)
return &Type{Size: 4, Align: 4, C: "int"}
}
@@ -568,11 +632,15 @@ typedef long long __cgo_long_long;
__cgo_size_assert(__cgo_long_long, 8)
__cgo_size_assert(float, 4)
__cgo_size_assert(double, 8)
+
+#include <errno.h>
+#include <string.h>
`
const builtinProlog = `
typedef struct { char *p; int n; } _GoString_;
_GoString_ GoString(char *p);
+_GoString_ GoStringN(char *p, int l);
char *CString(_GoString_);
`
@@ -580,24 +648,27 @@ const cProlog = `
#include "runtime.h"
#include "cgocall.h"
-#pragma dynimport initcgo initcgo "%slibcgo.so"
-#pragma dynimport libcgo_thread_start libcgo_thread_start "%slibcgo.so"
-#pragma dynimport libcgo_set_scheduler libcgo_set_scheduler "%slibcgo.so"
-#pragma dynimport _cgo_malloc _cgo_malloc "%slibcgo.so"
-#pragma dynimport _cgo_free _cgo_free "%slibcgo.so"
+void ·_Cerrno(void*, int32);
+
+void
+·_Cfunc_GoString(int8 *p, String s)
+{
+ s = runtime·gostring((byte*)p);
+ FLUSH(&s);
+}
void
-·_C_GoString(int8 *p, String s)
+·_Cfunc_GoStringN(int8 *p, int32 l, String s)
{
- s = gostring((byte*)p);
+ s = runtime·gostringn((byte*)p, l);
FLUSH(&s);
}
void
-·_C_CString(String s, int8 *p)
+·_Cfunc_CString(String s, int8 *p)
{
- p = cmalloc(s.len+1);
- mcpy((byte*)p, s.str, s.len);
+ p = runtime·cmalloc(s.len+1);
+ runtime·mcpy((byte*)p, s.str, s.len);
p[s.len] = 0;
FLUSH(&p);
}
@@ -610,6 +681,7 @@ typedef unsigned char uchar;
typedef unsigned short ushort;
typedef long long int64;
typedef unsigned long long uint64;
+typedef __SIZE_TYPE__ uintptr;
typedef struct { char *p; int n; } GoString;
typedef void *GoMap;
generated by cgit v1.2.3 (git 2.39.1) at 2025-02-17 10:06:40 +0000