From cc08d9232c4875a11b9e2a8097e069467d79f31f Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Wed, 16 Apr 2014 17:11:44 -0400
Subject: liblink: add leaf bit to object file format

Without the leaf bit, the linker cannot record
the correct frame size in the symbol table, and
then stack traces get mangled. (Only for ARM.)

Fixes #7338.
Fixes #7347.

LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/88550043
---
 src/pkg/debug/goobj/read.go | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'src/pkg/debug')

diff --git a/src/pkg/debug/goobj/read.go b/src/pkg/debug/goobj/read.go
index 8882eae534..c2e6fa0927 100644
--- a/src/pkg/debug/goobj/read.go
+++ b/src/pkg/debug/goobj/read.go
@@ -190,6 +190,7 @@ type Var struct {
 type Func struct {
 	Args     int        // size in bytes of of argument frame: inputs and outputs
 	Frame    int        // size in bytes of local variable frame
+	Leaf     bool       // function omits save of link register (ARM)
 	Var      []Var      // detail about local variables
 	PCSP     Data       // PC → SP offset map
 	PCFile   Data       // PC → file number map (index into File)
@@ -621,6 +622,7 @@ func (r *objReader) parseObject(prefix []byte) error {
 			s.Func = f
 			f.Args = r.readInt()
 			f.Frame = r.readInt()
+			f.Leaf = r.readInt() != 0
 			f.Var = make([]Var, r.readInt())
 			for i := range f.Var {
 				v := &f.Var[i]
-- 
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