tools: more intelligent caching for compile _info.

[ccan] / tools / depends.c

diff --git a/tools/depends.c b/tools/depends.c
index 7f232233b32b90bda37a9b5f35422e3c399ce6b0..6958c37bd2608c2125b1987aeb17b5d50d193a77 100644 (file)
--- a/tools/depends.c
+++ b/tools/depends.c
@@ -38,7 +38,7 @@ lines_from_cmd(const void *ctx, const char *format, ...)
 
 /* Be careful about trying to compile over running programs (parallel make).
  * temp_file helps here. */
-static char *compile_info(const void *ctx, const char *dir)
+char *compile_info(const void *ctx, const char *dir)
 {
        char *info_c_file, *info, *ccandir, *compiled, *output;
        size_t len;
@@ -71,17 +71,16 @@ static char *compile_info(const void *ctx, const char *dir)
        return NULL;
 }
 
-static char **get_one_deps(const void *ctx, const char *dir, char **infofile)
+static char **get_one_deps(const void *ctx, const char *dir,
+                          char *(*get_info)(const void *ctx, const char *dir))
 {
        char **deps, *cmd;
+       char *infofile = get_info(ctx, dir);
 
-       if (!*infofile) {
-               *infofile = compile_info(ctx, dir);
-               if (!*infofile)
-                       errx(1, "Could not compile _info for '%s'", dir);
-       }
+       if (!infofile)
+               return NULL;
 
-       cmd = talloc_asprintf(ctx, "%s depends", *infofile);
+       cmd = talloc_asprintf(ctx, "%s depends", infofile);
        deps = lines_from_cmd(cmd, "%s", cmd);
        if (!deps)
                err(1, "Could not run '%s'", cmd);
@@ -118,7 +117,7 @@ static char *replace(const void *ctx, const char *src,
 /* This is a terrible hack.  We scan for ccan/ strings. */
 static char **get_one_safe_deps(const void *ctx,
                                const char *dir,
-                               char **infofile)
+                               char *(*unused)(const void *, const char *))
 {
        char **deps, **lines, *raw, *fname;
        unsigned int i, n;
@@ -178,17 +177,17 @@ static bool have_dep(char **deps, const char *dep)
 /* Gets all the dependencies, recursively. */
 static char **
 get_all_deps(const void *ctx, const char *dir,
-            char **infofile,
-            char **(*get_one)(const void *, const char *, char **))
+            char *(*get_info)(const void *ctx, const char *dir),
+            char **(*get_one)(const void *, const char *,
+                              char *(*get_info)(const void *, const char *)))
 {
        char **deps;
        unsigned int i;
 
-       deps = get_one(ctx, dir, infofile);
+       deps = get_one(ctx, dir, get_info);
        for (i = 0; i < talloc_array_length(deps)-1; i++) {
                char **newdeps;
                unsigned int j;
-               char *subinfo = NULL;
                char *subdir;
 
                if (!strstarts(deps[i], "ccan/"))
@@ -197,7 +196,7 @@ get_all_deps(const void *ctx, const char *dir,
                subdir = talloc_asprintf(ctx, "%s/%s",
                                         talloc_dirname(ctx, dir),
                                         deps[i] + strlen("ccan/"));
-               newdeps = get_one(ctx, subdir, &subinfo);
+               newdeps = get_one(ctx, subdir, get_info);
 
                /* Should be short, so brute-force out dups. */
                for (j = 0; j < talloc_array_length(newdeps)-1; j++) {
@@ -240,6 +239,9 @@ static char **uniquify_deps(char **deps)
 {
        unsigned int i, j, num;
 
+       if (!deps)
+               return NULL;
+
        num = talloc_array_length(deps) - 1;
        for (i = 0; i < num; i++) {
                for (j = i + 1; j < num; j++) {
@@ -255,22 +257,16 @@ static char **uniquify_deps(char **deps)
        return talloc_realloc(NULL, deps, char *, num + 1);
 }
 
-char **get_deps(const void *ctx, const char *dir,
-               bool recurse, char **infofile)
+char **get_deps(const void *ctx, const char *dir, bool recurse,
+               char *(*get_info)(const void *ctx, const char *dir))
 {
-       char *temp = NULL, **ret;
-       if (!infofile)
-               infofile = &temp;
+       char **ret;
 
        if (!recurse) {
-               ret = get_one_deps(ctx, dir, infofile);
+               ret = get_one_deps(ctx, dir, get_info);
        } else
-               ret = get_all_deps(ctx, dir, infofile, get_one_deps);
+               ret = get_all_deps(ctx, dir, get_info, get_one_deps);
 
-       if (infofile == &temp && temp) {
-               unlink(temp);
-               talloc_free(temp);
-       }
        return uniquify_deps(ret);
 }