function call frame

+----------+<-=-g.stack.hi
| stack    |
| cRED     |         func main()
|          |         main frame
+----------+<-=-----+----------+
|   main   |        | cGRE     |
|  cGRE    |        |  local   |         func printsum(a, b int)
|          |        |          |         printsum frame
|          |        +----------+         +----------+
|          |        |          |         :          |
|          |        |  +8(SP)  |----=--->| b+8(FP)  |
|   call   |  +8(SP)| cPNK     |  arg b  | cGRE     |b+8(FP)
| printsum |        +----------+         +----------+
|          |        |          |         :          |
|          |        |  +0(SP)  |----=--->| a+0(FP)  |
|          |  +0(SP)| cPNK     |  arg a  | cGRE     |a+0(FP)
+----------+<-=-----+----------+<-=------+----------+
| printsum |                             |          |
| cYEL     |                             |var c int |         func sum(a, b int) int
|          |                             | cYEL     |c-8(SP)  sum frame
|          |                             +----------+         +----------+
| call sum |                             |          |         :          |
|          |                             |  sum.ret |<----=---|ret+16(FP)|
|          |                      +16(SP)| cPNK     | return  |          |ret+16(FP)
|          |                             +----------+         +----------+
|          |                             |          |         :          |
|          |                             |  sum.b   |-----=-->|  b+8(FP) |
|          |                       +8(SP)| cPNK     | arg b   |          |b+8(FP)
|          |                             +----------+         +----------+
|          |                             |          |         :          |
|          |                             |  sum.a   |-----=-->|  a+0(FP) |
|          |                       +0(SP)| cPNK     | arg a   |          |a+0(FP)
+----------+<-=--------------------------+----------+<-=------+----------+
| func sum |                                                  |  cBLU    |t-8(SP)
| cBLU     |                                                  |  local   |
| ret a+b  |                                                  |          |
+----------+<-=-----------------------------------------------+----------++0(SP)
| cAAA     |+0(SP)
|  unused  |
|          |
|          |
|          |
|          |
+----------+<-=-g.stack.lo
| cRED     |
|StackLimit|
|StackGuard|
+----------+