cmd/{addr2line,objdump}: fix finding pclntab and symtab for pe and plan9obj

Broken by 8b5fc7c59d05.

Update #8092

LGTM=iant, alex.brainman
R=rsc, iant, alex.brainman
CC=golang-codereviews
https://golang.org/cl/138770043

src/cmd/internal/objfile/pe.go

@@ -115,11 +115,20 @@ func (f *peFile) pcln() (textStart uint64, symtab, pclntab []byte, err error) {
 	if sect := f.pe.Section(".text"); sect != nil {
 		textStart = imageBase + uint64(sect.VirtualAddress)
 	}
-	if pclntab, err = loadPETable(f.pe, "pclntab", "epclntab"); err != nil {
-		return 0, nil, nil, err
+	if pclntab, err = loadPETable(f.pe, "runtime.pclntab", "runtime.epclntab"); err != nil {
+		// We didn't find the symbols, so look for the names used in 1.3 and earlier.
+		// TODO: Remove code looking for the old symbols when we no longer care about 1.3.
+		var err2 error
+		if pclntab, err2 = loadPETable(f.pe, "pclntab", "epclntab"); err2 != nil {
+			return 0, nil, nil, err
+		}
 	}
-	if symtab, err = loadPETable(f.pe, "symtab", "esymtab"); err != nil {
-		return 0, nil, nil, err
+	if symtab, err = loadPETable(f.pe, "runtime.symtab", "runtime.esymtab"); err != nil {
+		// Same as above.
+		var err2 error
+		if symtab, err2 = loadPETable(f.pe, "symtab", "esymtab"); err2 != nil {
+			return 0, nil, nil, err
+		}
 	}
 	return textStart, symtab, pclntab, nil
 }

src/cmd/internal/objfile/plan9obj.go

@@ -55,11 +55,20 @@ func (f *plan9File) symbols() ([]Sym, error) {
 
 func (f *plan9File) pcln() (textStart uint64, symtab, pclntab []byte, err error) {
 	textStart = f.plan9.LoadAddress + f.plan9.HdrSize
-	if pclntab, err = loadPlan9Table(f.plan9, "pclntab", "epclntab"); err != nil {
-		return 0, nil, nil, err
+	if pclntab, err = loadPlan9Table(f.plan9, "runtime.pclntab", "runtime.epclntab"); err != nil {
+		// We didn't find the symbols, so look for the names used in 1.3 and earlier.
+		// TODO: Remove code looking for the old symbols when we no longer care about 1.3.
+		var err2 error
+		if pclntab, err2 = loadPlan9Table(f.plan9, "pclntab", "epclntab"); err2 != nil {
+			return 0, nil, nil, err
+		}
 	}
-	if symtab, err = loadPlan9Table(f.plan9, "symtab", "esymtab"); err != nil {
-		return 0, nil, nil, err
+	if symtab, err = loadPlan9Table(f.plan9, "runtime.symtab", "runtime.esymtab"); err != nil {
+		// Same as above.
+		var err2 error
+		if symtab, err2 = loadPlan9Table(f.plan9, "symtab", "esymtab"); err2 != nil {
+			return 0, nil, nil, err
+		}
 	}
 	return textStart, symtab, pclntab, nil
 }

src/cmd/objdump/main.go

@@ -355,11 +355,20 @@ func loadTables(f *os.File) (textStart uint64, textData, symtab, pclntab []byte,
 			textStart = imageBase + uint64(sect.VirtualAddress)
 			textData, _ = sect.Data()
 		}
-		if pclntab, err = loadPETable(obj, "pclntab", "epclntab"); err != nil {
-			return 0, nil, nil, nil, err
+		if pclntab, err = loadPETable(obj, "runtime.pclntab", "runtime.epclntab"); err != nil {
+			// We didn't find the symbols, so look for the names used in 1.3 and earlier.
+			// TODO: Remove code looking for the old symbols when we no longer care about 1.3.
+			var err2 error
+			if pclntab, err2 = loadPETable(obj, "pclntab", "epclntab"); err2 != nil {
+				return 0, nil, nil, nil, err
+			}
 		}
-		if symtab, err = loadPETable(obj, "symtab", "esymtab"); err != nil {
-			return 0, nil, nil, nil, err
+		if symtab, err = loadPETable(obj, "runtime.symtab", "runtime.esymtab"); err != nil {
+			// Same as above.
+			var err2 error
+			if symtab, err2 = loadPETable(obj, "symtab", "esymtab"); err2 != nil {
+				return 0, nil, nil, nil, err
+			}
 		}
 		return textStart, textData, symtab, pclntab, nil
 	}
@@ -369,11 +378,20 @@ func loadTables(f *os.File) (textStart uint64, textData, symtab, pclntab []byte,
 		if sect := obj.Section("text"); sect != nil {
 			textData, _ = sect.Data()
 		}
-		if pclntab, err = loadPlan9Table(obj, "pclntab", "epclntab"); err != nil {
-			return 0, nil, nil, nil, err
+		if pclntab, err = loadPlan9Table(obj, "runtime.pclntab", "runtime.epclntab"); err != nil {
+			// We didn't find the symbols, so look for the names used in 1.3 and earlier.
+			// TODO: Remove code looking for the old symbols when we no longer care about 1.3.
+			var err2 error
+			if pclntab, err2 = loadPlan9Table(obj, "pclntab", "epclntab"); err2 != nil {
+				return 0, nil, nil, nil, err
+			}
 		}
-		if symtab, err = loadPlan9Table(obj, "symtab", "esymtab"); err != nil {
-			return 0, nil, nil, nil, err
+		if symtab, err = loadPlan9Table(obj, "runtime.symtab", "runtime.esymtab"); err != nil {
+			// Same as above.
+			var err2 error
+			if symtab, err2 = loadPlan9Table(obj, "symtab", "esymtab"); err2 != nil {
+				return 0, nil, nil, nil, err
+			}
 		}
 		return textStart, textData, symtab, pclntab, nil
 	}