From c7c20817dc767d1adf7e9ce713f3faad1e65f20c Mon Sep 17 00:00:00 2001
From: Hanno Becker <hanno.becker@arm.com>
Date: Wed, 3 Apr 2019 11:55:57 +0100
Subject: [PATCH] Measure stack usage in baremetal script

So far, `baremetal.sh --ram --stack` ran `callgrind` to extract
a call stack in an example run of ssl_client2 and ssl_server2.
This, however, needs to be complemented with per-function stack
usage to be able to extract the maximum stack usage.

This commit adds `-fstack-usage` to the CFLAGS used when building
the library in `baremetal.sh --ram` runs, which generates *.su
files indicating the stack usage of individual functions.
---
 scripts/baremetal.sh | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/scripts/baremetal.sh b/scripts/baremetal.sh
index 346937bd2..a2c59f556 100755
--- a/scripts/baremetal.sh
+++ b/scripts/baremetal.sh
@@ -155,7 +155,7 @@ baremetal_build_armc6()
 # 32-bit host-build of library, tests and example programs,
 # + heap usage measurements.
 baremetal_ram_build() {
-    : ${BASE_CFLAGS:="-g -m32"}
+    : ${BASE_CFLAGS:="-g -m32 -fstack-usage"}
     echo "Create 32-bit host-build (Config: $BAREMETAL_CONFIG + $BAREMETAL_USER_CONFIG)"
 
     echo "Cleanup..."
@@ -241,13 +241,14 @@ baremetal_ram_stack() {
     : ${VALGRIND:=valgrind}
     : ${VALGRIND_CALLGRIND_PARAMS:="--separate-callers=100"}
 
+    RAM_CALLGRIND_OUT="ram_callgrind__${date}__$NAME"
     RAM_STACK_OUT="ram_stack__${date}__$NAME"
 
     SRV_CMD="$SRV server_addr=127.0.0.1 server_port=4433 debug_level=4 $SRV_PARAMS"
     CLI_CMD="$CLI server_addr=127.0.0.1 server_port=4433 $CLI_PARAMS"
 
     VALGRIND_BASE="$VALGRIND --tool=callgrind $VALGRIND_CALLGRIND_PARAMS"
-    VALGRIND_CMD="$VALGRIND_BASE --callgrind-out-file=${RAM_STACK_OUT} $CLI_CMD"
+    VALGRIND_CMD="$VALGRIND_BASE --callgrind-out-file=${RAM_CALLGRIND_OUT} $CLI_CMD"
 
     $SRV_CMD  > /dev/null 2>&1 &
     SRV_PID=$!
@@ -262,7 +263,12 @@ baremetal_ram_stack() {
     kill $SRV_PID
     echo "Done"
 
-    echo "SUCCESS - Stack usage statistics written to: $RAM_STACK_OUT\n"
+    # Merge stack usage files
+    cat library/*.su > ${RAM_STACK_OUT}_unsorted
+    sort -r -k2 -n ${RAM_STACK_OUT}_unsorted > $RAM_STACK_OUT
+    rm ${RAM_STACK_OUT}_unsorted
+
+    echo "SUCCESS - Statistics written to $RAM_STACK_OUT and $RAM_CALLGRIND_OUT\n"
 }
 
 show_usage() {