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https://github.com/stedolan/jq.git
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Added library system with -l, -L, and JQ_LIBRARY_PATH
Created util.[ch] to hold common utilities.
This commit is contained in:
William Langford
committed by
Nicolas Williams
Nicolas Williams
parent
01fc8168e9
commit
38b939688a
195
linker.c
Normal file
195
linker.c
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#include <assert.h>
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#include <limits.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <sys/stat.h>
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#include <libgen.h>
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#include "jq_parser.h"
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#include "locfile.h"
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#include "jv.h"
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#include "jq.h"
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#include "parser.h"
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#include "util.h"
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#include "compile.h"
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struct lib_loading_state {
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char **names;
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block *defs;
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uint64_t ct;
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};
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static int load_library(jq_state *jq, jv lib_path, block *out_block, struct lib_loading_state *lib_state);
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// Given a lib_path to search first, creates a chain of search paths
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// in the following order:
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// 1. lib_path
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// 2. -L paths passed in on the command line (from jq_state*)
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// 3. JQ_LIBRARY_PATH environment variable
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jv build_lib_search_chain(jq_state *jq, jv lib_path) {
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assert(jv_get_kind(lib_path) == JV_KIND_STRING);
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jv out_paths = jv_array();
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if (jv_string_length_bytes(jv_copy(lib_path)))
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out_paths = jv_array_append(out_paths, lib_path);
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else
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jv_free(lib_path);
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jv lib_dirs = jq_get_lib_dirs(jq);
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jv_array_foreach(lib_dirs, i, path) {
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if (jv_string_length_bytes(jv_copy(path)) == 0) {
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jv_free(path);
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continue;
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}
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path = expand_path(path);
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if (jv_is_valid(path)) {
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out_paths = jv_array_append(out_paths, path);
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} else {
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jv emsg = jv_invalid_get_msg(path);
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fprintf(stderr, "jq: warning: skipping search path: %s\n", jv_string_value(emsg));
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jv_free(emsg);
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}
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}
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jv_free(lib_dirs);
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return out_paths;
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}
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static jv find_lib(jq_state *jq, jv lib_name, jv lib_search_path) {
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assert(jv_get_kind(lib_search_path) == JV_KIND_STRING);
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assert(jv_get_kind(lib_name) == JV_KIND_STRING);
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lib_search_path = expand_path(lib_search_path);
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struct stat st;
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int ret;
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jv lib_search_paths = build_lib_search_chain(jq, lib_search_path);
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jv_array_foreach(lib_search_paths, i, spath) {
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jv testpath = jq_realpath(jv_string_fmt("%s/%s.jq",jv_string_value(spath),jv_string_value(lib_name)));
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jv_free(spath);
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ret = stat(jv_string_value(testpath),&st);
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if (ret == 0) {
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jv_free(lib_name);
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jv_free(lib_search_paths);
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return testpath;
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}
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jv_free(testpath);
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}
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jv output = jv_invalid_with_msg(jv_string_fmt("could not find library: %s", jv_string_value(lib_name)));
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jv_free(lib_name);
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jv_free(lib_search_paths);
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return output;
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}
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static int process_dependencies(jq_state *jq, jv lib_origin, block *src_block, struct lib_loading_state *lib_state) {
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jv deps = block_take_imports(src_block);
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block bk = *src_block;
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int nerrors = 0;
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jv_array_foreach(deps, i, dep) {
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jv name = jv_object_get(jv_copy(dep), jv_string("name"));
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jv as = jv_object_get(jv_copy(dep), jv_string("as"));
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if (!jv_is_valid(as)) {
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jv_free(as);
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as = jv_copy(name);
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}
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jv search = jv_object_get(dep, jv_string("search"));
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if (!jv_is_valid(search)) {
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jv_free(search);
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search = jv_string("");
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}
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if (strncmp("$ORIGIN/",jv_string_value(search),8) == 0) {
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jv tsearch = jv_string_fmt("%s/%s",jv_string_value(lib_origin),jv_string_value(search)+8);
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jv_free(search);
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search = tsearch;
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}
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jv lib_path = find_lib(jq, name, search);
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if (!jv_is_valid(lib_path)) {
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jv emsg = jv_invalid_get_msg(lib_path);
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fprintf(stderr, "jq: error: %s\n",jv_string_value(emsg));
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jv_free(emsg);
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jv_free(lib_origin);
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jv_free(as);
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jv_free(deps);
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return 1;
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}
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uint64_t state_idx = 0;
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for (; state_idx < lib_state->ct; ++state_idx) {
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if (strcmp(lib_state->names[state_idx],jv_string_value(lib_path)) == 0)
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break;
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}
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if (state_idx < lib_state->ct) { // Found
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bk = block_bind_library(lib_state->defs[state_idx], bk, OP_IS_CALL_PSEUDO, jv_string_value(as));
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jv_free(lib_path);
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} else { // Not found. Add it to the table before binding.
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block dep_def_block = gen_noop();
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nerrors += load_library(jq, lib_path, &dep_def_block, lib_state);
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if (nerrors == 0)
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bk = block_bind_library(dep_def_block, bk, OP_IS_CALL_PSEUDO, jv_string_value(as));
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else
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block_free(dep_def_block);
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}
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jv_free(as);
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}
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jv_free(lib_origin);
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jv_free(deps);
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return nerrors;
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}
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// Loads the library at lib_path into lib_state, putting the library's defs
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// into *out_block
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static int load_library(jq_state *jq, jv lib_path, block *out_block, struct lib_loading_state *lib_state) {
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int nerrors = 0;
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struct locfile* src;
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block program;
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jv data = jv_load_file(jv_string_value(lib_path), 1);
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int state_idx;
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if (jv_is_valid(data)) {
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src = locfile_init(jq, jv_string_value(data), jv_string_length_bytes(jv_copy(data)));
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nerrors += jq_parse_library(src, &program);
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if (nerrors == 0) {
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state_idx = lib_state->ct++;
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lib_state->names = realloc(lib_state->names, lib_state->ct * sizeof(const char *));
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lib_state->defs = realloc(lib_state->defs, lib_state->ct * sizeof(block));
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lib_state->names[state_idx] = strdup(jv_string_value(lib_path));
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lib_state->defs[state_idx] = program;
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char *lib_origin = strdup(jv_string_value(lib_path));
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nerrors += process_dependencies(jq, jv_string(dirname(lib_origin)), &lib_state->defs[state_idx], lib_state);
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free(lib_origin);
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*out_block = lib_state->defs[state_idx];
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}
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locfile_free(src);
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}
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jv_free(lib_path);
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jv_free(data);
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return nerrors;
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}
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int load_program(jq_state *jq, struct locfile* src, block *out_block) {
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int nerrors = 0;
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block program;
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struct lib_loading_state lib_state = {0,0,0};
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nerrors = jq_parse(src, &program);
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if (nerrors)
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return nerrors;
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nerrors = process_dependencies(jq, jq_get_lib_origin(jq), &program, &lib_state);
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block libs = gen_noop();
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for (uint64_t i = 0; i < lib_state.ct; ++i) {
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free(lib_state.names[i]);
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if (nerrors == 0)
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libs = block_join(libs, lib_state.defs[i]);
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else
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block_free(lib_state.defs[i]);
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}
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free(lib_state.names);
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free(lib_state.defs);
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if (nerrors)
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block_free(program);
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else
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*out_block = block_drop_unreferenced(block_join(libs, program));
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return nerrors;
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}
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