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-rw-r--r--src/mds-kbdc/eliminate-dead-code.c224
-rw-r--r--src/mds-kbdc/eliminate-dead-code.h35
-rw-r--r--src/mds-kbdc/mds-kbdc.c4
3 files changed, 262 insertions, 1 deletions
diff --git a/src/mds-kbdc/eliminate-dead-code.c b/src/mds-kbdc/eliminate-dead-code.c
new file mode 100644
index 0000000..495cbb5
--- /dev/null
+++ b/src/mds-kbdc/eliminate-dead-code.c
@@ -0,0 +1,224 @@
+/**
+ * mds — A micro-display server
+ * Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "eliminate-dead-code.h"
+
+#include <stdlib.h>
+#include <errno.h>
+
+
+
+/**
+ * Tree type constant shortener
+ */
+#define C(TYPE) MDS_KBDC_TREE_TYPE_##TYPE
+
+/**
+ * Add an error to the error list
+ *
+ * @param NODE:const mds_kbdc_tree_t* The node the triggered the error
+ * @param SEVERITY:identifier * in `MDS_KBDC_PARSE_ERROR_*` to indicate severity
+ * @param ...:const char*, ... Error description format string and arguments
+ * @scope error:mds_kbdc_parse_error_t* Variable where the new error will be stored
+ */
+#define NEW_ERROR(NODE, SEVERITY, ...) \
+ NEW_ERROR_(result, SEVERITY, 1, (NODE)->loc_line, \
+ (NODE)->loc_start, (NODE)->loc_end, 1, __VA_ARGS__)
+
+/**
+ * Add “included from here”-notes
+ *
+ * @param PTR:size_t The number of “included from here”-notes
+ */
+#define DUMP_INCLUDE_STACK(PTR) \
+ fail_if (dump_include_stack(PTR))
+
+/**
+ * Add an error with “included from here”-notes to the error list
+ *
+ * @param NODE:const mds_kbdc_tree_t* The node the triggered the error
+ * @param PTR:size_t The number of “included from here”-notes
+ * @param SEVERITY:identifier * in `MDS_KBDC_PARSE_ERROR_*` to indicate severity
+ * @param ...:const char*, ... Error description format string and arguments
+ * @scope error:mds_kbdc_parse_error_t* Variable where the new error will be stored
+ */
+#define NEW_ERROR_WITH_INCLUDES(NODE, PTR, SEVERITY, ...) \
+ do \
+ { \
+ NEW_ERROR(NODE, SEVERITY, __VA_ARGS__); \
+ DUMP_INCLUDE_STACK(PTR); \
+ } \
+ while (0)
+
+
+
+/**
+ * Variable whether the latest created error is stored
+ */
+static mds_kbdc_parse_error_t* error;
+
+/**
+ * The parameter of `eliminate_dead_code`
+ */
+static mds_kbdc_parsed_t* restrict result;
+
+/**
+ * The original value of `result->pathname`
+ */
+static char* original_pathname;
+
+/**
+ * The original value of `result->source_code`
+ */
+static mds_kbdc_source_code_t* original_source_code;
+
+/**
+ * Stack of visited include-statements
+ */
+static mds_kbdc_tree_include_t** restrict includes = NULL;
+
+/**
+ * The number elements allocated for `includes`
+ */
+static size_t includes_size = 0;
+
+/**
+ * The number elements stored in `includes`
+ */
+static size_t includes_ptr = 0;
+
+
+
+/**
+ * Validate that a part of the structure of the compilation unit
+ *
+ * @param tree The tree to validate
+ * @return Zero on success, -1 on error
+ */
+static int eliminate_subtree(mds_kbdc_tree_t* restrict tree);
+
+
+
+/**
+ * Add “included from here”-notes
+ *
+ * @param ptr The number of “included from here”-notes
+ * @return Zero on success, -1 on error
+ */
+static int dump_include_stack(size_t ptr)
+{
+ char* old_pathname = result->pathname;
+ mds_kbdc_source_code_t* old_source_code = result->source_code;
+ while (ptr--)
+ {
+ result->pathname = ptr ? includes[ptr - 1]->filename : original_pathname;
+ result->source_code = ptr ? includes[ptr - 1]->source_code : original_source_code;
+ NEW_ERROR(includes[ptr], NOTE, "included from here");
+ }
+ result->pathname = old_pathname;
+ result->source_code = old_source_code;
+ return 0;
+ pfail:
+ result->pathname = old_pathname;
+ result->source_code = old_source_code;
+ return -1;
+}
+
+
+/**
+ * Eliminate dead code in an include-statement
+ *
+ * @param tree The tree to reduce
+ * @return Zero on success, -1 on error
+ */
+static int eliminate_include(mds_kbdc_tree_include_t* restrict tree)
+{
+ mds_kbdc_tree_include_t** old;
+ char* pathname = result->pathname;
+ mds_kbdc_source_code_t* source_code = result->source_code;
+ int r, saved_errno;
+ if (includes_ptr == includes_size)
+ if (xxrealloc(old, includes, includes_size += 4, mds_kbdc_tree_include_t*))
+ return saved_errno = errno, free(old), errno = saved_errno, -1;
+ includes[includes_ptr++] = tree;
+ result->pathname = tree->filename;
+ result->source_code = tree->source_code;
+ r = eliminate_subtree(tree->inner);
+ result->pathname = pathname;
+ result->source_code = source_code;
+ return includes_ptr--, r;
+}
+
+
+/**
+ * Eliminate dead code in a subtree
+ *
+ * @param tree The tree to reduce
+ * @return Zero on success, -1 on error
+ */
+static int eliminate_subtree(mds_kbdc_tree_t* restrict tree)
+{
+#define e(type) if ((r = eliminate_##type(&(tree->type)))) return r
+#define E(type) if ((r = eliminate_##type(&(tree->type##_)))) return r
+ int r;
+ again:
+ if (tree == NULL)
+ return 0;
+
+ switch (tree->type)
+ {
+ case C(INCLUDE): e(include); break;
+ default:
+ break;
+ }
+
+ tree = tree->next;
+ goto again;
+#undef E
+#undef e
+}
+
+
+/**
+ * Eliminate and warn about dead code
+ *
+ * @param result_ `result` from `validate_tree`, will be updated
+ * @return -1 if an error occursed that cannot be stored in `result`, zero otherwise
+ */
+int eliminate_dead_code(mds_kbdc_parsed_t* restrict result_)
+{
+ int r, saved_errno;
+ result = result_;
+ original_pathname = result_->pathname;
+ original_source_code = result_->source_code;
+ r = eliminate_subtree(result_->tree);
+ saved_errno = errno;
+ result_->pathname = original_pathname;
+ result_->source_code = original_source_code;
+ free(includes), includes = NULL;
+ includes_size = includes_ptr = 0;
+ return errno = saved_errno, r;
+}
+
+
+
+#undef NEW_ERROR_WITH_INCLUDES
+#undef DUMP_INCLUDE_STACK
+#undef NEW_ERROR
+#undef C
+
+
diff --git a/src/mds-kbdc/eliminate-dead-code.h b/src/mds-kbdc/eliminate-dead-code.h
new file mode 100644
index 0000000..55c351a
--- /dev/null
+++ b/src/mds-kbdc/eliminate-dead-code.h
@@ -0,0 +1,35 @@
+/**
+ * mds — A micro-display server
+ * Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef MDS_MDS_KBDC_ELIMINATE_DEAD_CODE_H
+#define MDS_MDS_KBDC_ELIMINATE_DEAD_CODE_H
+
+
+#include "parsed.h"
+
+
+/**
+ * Eliminate and warn about dead code
+ *
+ * @param result `result` from `validate_tree`, will be updated
+ * @return -1 if an error occursed that cannot be stored in `result`, zero otherwise
+ */
+int eliminate_dead_code(mds_kbdc_parsed_t* restrict result);
+
+
+#endif
+
diff --git a/src/mds-kbdc/mds-kbdc.c b/src/mds-kbdc/mds-kbdc.c
index 9c668c8..6f4be18 100644
--- a/src/mds-kbdc/mds-kbdc.c
+++ b/src/mds-kbdc/mds-kbdc.c
@@ -21,6 +21,8 @@
#include "make-tree.h"
#include "simplify-tree.h"
#include "process-includes.h"
+#include "validate-tree.h"
+#include "eliminate-dead-code.h"
#include <libmdsserver/macros.h>
@@ -56,7 +58,7 @@ int main(int argc_, char** argv_)
process (simplify_tree(&result));
process (process_includes(&result));
process (validate_tree(&result));
- /* TODO process (eliminate_dead_code(&result)); */
+ process (eliminate_dead_code(&result));
/* TODO process (compile_layout(&result)); */
/* TODO process (assemble_layout(&result)); */
stop:
generated by cgit v1.2.3-70-g09d2 (git 2.47.0) at 2024-12-16 02:16:32 +0000