idlestat: Separate loading of different trace file formats

This patch separates loading of different trace file formats to
independent functions. In order to call the correct function for
each trace file processed, each load function comes with a match
function. Pointers to these functions are stored in a new
struct trace_ops.

In order to avoid static lists of trace file formats (e.g.
implemented as static arrays or a number of registration
function calls in main), pointers to all trace_ops structures
are collected by the linker into a private segment. This creates
an implicit array of the pointers, which may then be enumerated
starting right after a globally linked element trace_ops_head.
A sentinel NULL pointer trails the array. A helper macro
EXPORT_TRACE_OPS is added for creating the special pointers.

Signed-off-by: Tuukka Tikkanen <tuukka.tikkanen@linaro.org>

Reviewed-by: Koan-Sin Tan <freedom.tan@linaro.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index e83130e..0de28be 100644
--- a/Makefile
+++ b/Makefile
@@ -25,7 +25,11 @@ CFLAGS?=-g -Wall
 CC=gcc
 
 OBJS =	idlestat.o topology.o trace.o utils.o energy_model.o \
-	default_report.o csv_report.o
+	default_report.o csv_report.o \
+	trace_ops_head.o \
+	tracefile_idlestat.o \
+	tracefile_ftrace.o \
+	trace_ops_tail.o
 
 default: idlestat