[src/trunk]: src/usr.bin/make make(1): merge curFile into includes

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/af8432a7802c
branches:  trunk
changeset: 945385:af8432a7802c
user:      rillig <rillig%NetBSD.org@localhost>
date:      Wed Oct 28 03:12:54 2020 +0000

description:
make(1): merge curFile into includes

This makes GetActuallyIncludingFile simpler since it no longer needs the
special case for curFile.

The type of 'includes' has changed from Vector<IFile *> to
Vector<IFile>, to avoid a few extra memory allocations and because
Vector is easier to use with structs than with pointers (see
GetInclude).

diffstat:

 usr.bin/make/parse.c |  83 +++++++++++++++++++++++++--------------------------
 1 files changed, 40 insertions(+), 43 deletions(-)

diffs (236 lines):

diff -r 42cd7ad8fc5e -r af8432a7802c usr.bin/make/parse.c
--- a/usr.bin/make/parse.c      Wed Oct 28 02:43:16 2020 +0000
+++ b/usr.bin/make/parse.c      Wed Oct 28 03:12:54 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: parse.c,v 1.407 2020/10/28 01:58:37 rillig Exp $       */
+/*     $NetBSD: parse.c,v 1.408 2020/10/28 03:12:54 rillig Exp $       */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -117,7 +117,7 @@
 #include "pathnames.h"
 
 /*     "@(#)parse.c    8.3 (Berkeley) 3/19/94" */
-MAKE_RCSID("$NetBSD: parse.c,v 1.407 2020/10/28 01:58:37 rillig Exp $");
+MAKE_RCSID("$NetBSD: parse.c,v 1.408 2020/10/28 03:12:54 rillig Exp $");
 
 /* types and constants */
 
@@ -226,13 +226,9 @@
  * Variables for doing includes
  */
 
-/* current file being read */
-static IFile *curFile;
-
-/* The include chain of makefiles that leads to curFile.  At the bottom of
- * the stack is the top-level makefile from the command line, and on top of
- * this file, there are the included files or .for loops, up to but excluding
- * curFile.
+/* The include chain of makefiles.  At the bottom is the top-level makefile
+ * from the command line, and on top of that, there are the included files or
+ * .for loops, up to and including the current file.
  *
  * This data could be used to print stack traces on parse errors.  As of
  * 2020-09-14, this is not done though.  It seems quite simple to print the
@@ -249,13 +245,13 @@
  *
  * To make the stack trace intuitive, the entry below the first .for loop must
  * be ignored completely since neither its lineno nor its first_lineno is
- * useful.  Instead, the topmost .for loop needs to be printed twice, once
- * with its first_lineno and once with its lineno.
+ * useful.  Instead, the topmost of each chain of .for loop needs to be
+ * printed twice, once with its first_lineno and once with its lineno.
  *
- * As of 2020-09-15, using the above rules, the stack trace for the .info line
+ * As of 2020-10-28, using the above rules, the stack trace for the .info line
  * in include-subsub.mk would be:
  *
- *     curFile:        include-subsub.mk:4
+ *     includes[5]:    include-subsub.mk:4
  *                     (lineno, from an .include)
  *     includes[4]:    include-sub.mk:32
  *                     (lineno, from a .for loop below an .include)
@@ -269,12 +265,19 @@
  *                     (not printed since it is below a .for loop)
  *     includes[0]:    include-main.mk:27
  */
-static Vector /* of IFile pointer */ includes;
+static Vector /* of IFile */ includes;
 
 static IFile *
 GetInclude(size_t i)
 {
-    return *((IFile **)Vector_Get(&includes, i));
+    return Vector_Get(&includes, i);
+}
+
+/* The file that is currently being read. */
+static IFile *
+CurFile(void)
+{
+    return GetInclude(includes.len - 1);
 }
 
 /* include paths (lists of directories) */
@@ -571,6 +574,7 @@
 static void
 ParseMark(GNode *gn)
 {
+    IFile *curFile = CurFile();
     gn->fname = curFile->fname;
     gn->lineno = curFile->lineno;
 }
@@ -694,10 +698,11 @@
        const char *fname;
        size_t lineno;
 
-       if (curFile == NULL) {
+       if (includes.len == 0) {
                fname = NULL;
                lineno = 0;
        } else {
+               IFile *curFile = CurFile();
                fname = curFile->fname;
                lineno = (size_t)curFile->lineno;
        }
@@ -2152,7 +2157,7 @@
         * we can locate the beast.
         */
 
-       incdir = bmake_strdup(curFile->fname);
+       incdir = bmake_strdup(CurFile()->fname);
        prefEnd = strrchr(incdir, '/');
        if (prefEnd != NULL) {
            *prefEnd = '\0';
@@ -2225,7 +2230,7 @@
 
     /* Start reading from this file next */
     Parse_SetInput(fullname, 0, -1, loadedfile_nextbuf, lf);
-    curFile->lf = lf;
+    CurFile()->lf = lf;
     if (depinc)
        doing_depend = depinc;  /* only turn it on */
 }
@@ -2316,13 +2321,11 @@
 GetActuallyIncludingFile(void)
 {
     size_t i;
-
-    for (i = includes.len; i > 0; i--) {
-       IFile *parent = GetInclude(i - 1);
-       IFile *child = i < includes.len ? GetInclude(i) : curFile;
-       if (!child->fromForLoop)
-           return parent->fname;
-    }
+    const IFile *incs = GetInclude(0);
+
+    for (i = includes.len; i >= 2; i--)
+       if (!incs[i - 1].fromForLoop)
+           return incs[i - 2].fname;
     return NULL;
 }
 
@@ -2379,12 +2382,13 @@
 Parse_SetInput(const char *name, int line, int fd,
               char *(*nextbuf)(void *, size_t *), void *arg)
 {
+    IFile *curFile;
     char *buf;
     size_t len;
     Boolean fromForLoop = name == NULL;
 
     if (fromForLoop)
-       name = curFile->fname;
+       name = CurFile()->fname;
     else
        ParseTrackInput(name);
 
@@ -2398,14 +2402,7 @@
        /* sanity */
        return;
 
-    if (curFile != NULL) {
-       /* Save existing file info */
-       IFile **next = Vector_Push(&includes);
-       *next = curFile;
-    }
-
-    /* Allocate and fill in new structure */
-    curFile = bmake_malloc(sizeof *curFile);
+    curFile = Vector_Push(&includes);
 
     /*
      * Once the previous state has been saved, we can get down to reading
@@ -2569,6 +2566,7 @@
 {
     char *ptr;
     size_t len;
+    IFile *curFile = CurFile();
 
     assert(curFile->nextbuf != NULL);
 
@@ -2595,10 +2593,9 @@
     /* Dispose of curFile info */
     /* Leak curFile->fname because all the gnodes have pointers to it */
     free(curFile->buf_freeIt);
-    free(curFile);
+    Vector_Pop(&includes);
 
     if (includes.len == 0) {
-       curFile = NULL;
        /* We've run out of input */
        Var_Delete(".PARSEDIR", VAR_GLOBAL);
        Var_Delete(".PARSEFILE", VAR_GLOBAL);
@@ -2607,8 +2604,7 @@
        return FALSE;
     }
 
-    curFile = GetInclude(includes.len - 1);
-    Vector_Pop(&includes);
+    curFile = CurFile();
     DEBUG2(PARSE, "ParseEOF: returning to file %s, line %d\n",
           curFile->fname, curFile->lineno);
 
@@ -2622,7 +2618,7 @@
 static char *
 ParseGetLine(int flags)
 {
-    IFile *cf = curFile;
+    IFile *cf = CurFile();
     char *ptr;
     char ch;
     char *line;
@@ -2829,7 +2825,7 @@
                /* Syntax error - error printed, ignore line */
                continue;
            /* Start of a .for loop */
-           lineno = curFile->lineno;
+           lineno = CurFile()->lineno;
            /* Accumulate loop lines until matching .endfor */
            do {
                line = ParseGetLine(PARSE_RAW);
@@ -3116,11 +3112,12 @@
        name = "(stdin)";
 
     Parse_SetInput(name, 0, -1, loadedfile_nextbuf, lf);
-    curFile->lf = lf;
+    CurFile()->lf = lf;
 
     do {
        while ((line = ParseReadLine()) != NULL) {
-           DEBUG2(PARSE, "ParseReadLine (%d): '%s'\n", curFile->lineno, line);
+           DEBUG2(PARSE, "ParseReadLine (%d): '%s'\n",
+                  CurFile()->lineno, line);
            ParseLine(line);
        }
        /*
@@ -3148,7 +3145,7 @@
     parseIncPath = Lst_New();
     sysIncPath = Lst_New();
     defIncPath = Lst_New();
-    Vector_Init(&includes, sizeof(IFile *));
+    Vector_Init(&includes, sizeof(IFile));
 #ifdef CLEANUP
     targCmds = Lst_New();
 #endif