The effect of this flag is to dump the IR just after the
linearization, before any simplification, and to stop
further processing if '=only' is given as argument.
The motivation of this flag is of course for debugging,
to be able to inspect the raw result of the linearization,
undisturbed by an simplification.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
---
lib.c | 23 +++++++++++++++++++++++
lib.h | 2 ++
linearize.c | 6 ++++++
sparse.1 | 7 +++++++
4 files changed, 38 insertions(+)
diff --git a/lib.c b/lib.c
index 272d2c88a..ca8ff2d17 100644
--- a/lib.c
+++ b/lib.c
@@ -250,6 +250,8 @@ int Wvla = 1;
int dbg_entry = 0;
int dbg_dead = 0;
+int fdump_linearize;
+
int preprocess_only;
static enum { STANDARD_C89,
@@ -645,12 +647,33 @@ static char **handle_switch_ftabstop(char *arg, char **next)
return next;
}
+static char **handle_switch_fdump(char *arg, char **next)
+{
+ if (!strncmp(arg, "linearize", 9)) {
+ arg += 9;
+ if (*arg == '\0')
+ fdump_linearize = 1;
+ else if (!strcmp(arg, "=only"))
+ fdump_linearize = 2;
+ else
+ goto err;
+ }
+
+ /* ignore others flags */
+ return next;
+
+err:
+ die("error: unknown flag \"-fdump-%s\"", arg);
+}
+
static char **handle_switch_f(char *arg, char **next)
{
arg++;
if (!strncmp(arg, "tabstop=", 8))
return handle_switch_ftabstop(arg+8, next);
+ if (!strncmp(arg, "dump-", 5))
+ return handle_switch_fdump(arg+5, next);
/* handle switches w/ arguments above, boolean and only boolean below */
diff --git a/lib.h b/lib.h
index 134e56040..fb612d154 100644
--- a/lib.h
+++ b/lib.h
@@ -136,6 +136,8 @@ extern int Wvla;
extern int dbg_entry;
extern int dbg_dead;
+extern int fdump_linearize;
+
extern int arch_m64;
extern void declare_builtin_functions(void);
diff --git a/linearize.c b/linearize.c
index 2f850fb7e..61c804333 100644
--- a/linearize.c
+++ b/linearize.c
@@ -2171,6 +2171,12 @@ static struct entrypoint *linearize_fn(struct symbol *sym, struct symbol *base_t
add_one_insn(ep, insn);
}
+ if (fdump_linearize) {
+ if (fdump_linearize == 2)
+ return ep;
+ show_entry(ep);
+ }
+
/*
* Do trivial flow simplification - branches to
* branches, kill dead basicblocks etc
diff --git a/sparse.1 b/sparse.1
index 85d6e646b..525d3ded5 100644
--- a/sparse.1
+++ b/sparse.1
@@ -344,6 +344,13 @@ Look for system headers in the multiarch subdirectory \fIdir\fR.
The \fIdir\fR name would normally take the form of the target's
normalized GNU triplet. (e.g. i386-linux-gnu).
.
+.SH DEBUG OPTIONS
+.TP
+.B \-fdump-linearize[=only]
+Dump the IR code of a function directly after its linearization,
+before any simplifications is made. If the argument \fB=only\fR is
+also given no further processing is done on the function.
+.
.SH OTHER OPTIONS
.TP
.B \-ftabstop=WIDTH
--
2.12.0
--
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