Revert "support compressed debug_line"

This reverts commit r64328

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64329 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 7 insertions, 55 deletions

diff --git a/addr2line.c b/addr2line.c
index a5b3e22074..fbe64758bc 100644
--- a/addr2line.c
+++ b/addr2line.c
@@ -101,9 +101,7 @@ void *alloca();
 #define PATH_MAX 4096
 #endif
 
-#ifdef SHF_COMPRESSED
-#include <zlib.h>
-#else /* compatibility with glibc < 2.22 */
+#ifndef SHF_COMPRESSED /* compatibility with glibc < 2.22 */
 #define SHF_COMPRESSED 0
 #endif
 
@@ -480,41 +478,6 @@ follow_debuglink(const char *debuglink, int num_traces, void **traces,
     fill_lines(num_traces, traces, 0, objp, lines, offset);
 }
 
-static int
-parse_compressed_debug_line(int num_traces, void **traces,
-		 char *debug_line, unsigned long size,
-		 obj_info_t *obj, line_info_t *lines, int offset)
-{
-    void *uncompressed_debug_line;
-    ElfW(Chdr) *chdr = (ElfW(Chdr) *)debug_line;
-    unsigned long destsize = chdr->ch_size;
-    int ret = 0;
-
-    if (chdr->ch_type != ELFCOMPRESS_ZLIB) {
-	/* unsupported compression type */
-	return -1;
-    }
-
-    uncompressed_debug_line = malloc(destsize);
-    if (!uncompressed_debug_line) return -1;
-    ret = uncompress(uncompressed_debug_line, &destsize,
-	    (const Bytef *)debug_line + sizeof(ElfW(Chdr)), size-sizeof(ElfW(Chdr)));
-    if (ret != Z_OK) { /* Z_OK = 0 */
-	goto finish;
-    }
-    ret = parse_debug_line(num_traces, traces,
-	    uncompressed_debug_line,
-	    destsize,
-	    obj, lines, offset);
-    if (ret) {
-	goto finish;
-    }
-
-finish:
-    free(uncompressed_debug_line);
-    return ret ? -1 : 0;
-}
-
 /* read file and fill lines */
 static uintptr_t
 fill_lines(int num_traces, void **traces, int check_debuglink,
@@ -681,20 +644,12 @@ fill_lines(int num_traces, void **traces, int check_debuglink,
 	goto finish;
     }
 
-    if (compressed_p) {
-	int r = parse_compressed_debug_line(num_traces, traces,
-		file + debug_line_shdr->sh_offset,
-		debug_line_shdr->sh_size,
-		obj, lines, offset);
-	if (r) goto fail;
-    }
-    else {
-	int r = parse_debug_line(num_traces, traces,
-		file + debug_line_shdr->sh_offset,
-		debug_line_shdr->sh_size,
-		obj, lines, offset);
-	if (r) goto fail;
-    }
+    if (!compressed_p &&
+	    parse_debug_line(num_traces, traces,
+			 file + debug_line_shdr->sh_offset,
+			 debug_line_shdr->sh_size,
+			 obj, lines, offset))
+	goto fail;
 finish:
     return dladdr_fbase;
 fail:
diff --git a/configure.ac b/configure.ac
index 30d6afa9ce..358acbe261 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2451,9 +2451,6 @@ AS_IF([test "$rb_cv_binary_elf" = yes], [
   AC_CHECK_HEADERS([elf.h elf_abi.h])
   AS_IF([test $ac_cv_header_elf_h = yes -o $ac_cv_header_elf_abi_h = yes], [
     AC_LIBOBJ([addr2line])
-    AS_IF([test "x$compress_debug_sections" = xzlib], [
-      AC_CHECK_LIB([z], [uncompress])
-    ])
   ])
 ])