91 lines
2.5 KiB
C++
91 lines
2.5 KiB
C++
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#include "rust_gc_metadata.h"
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#include "rust_crate_map.h"
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#include "rust_globals.h"
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#include <algorithm>
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#include <vector>
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struct safe_point {
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uintptr_t safe_point_loc;
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uintptr_t safe_point_meta;
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uintptr_t function_meta;
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};
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struct update_gc_entry_args {
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std::vector<safe_point> *safe_points;
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};
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static void
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update_gc_entry(const mod_entry *entry, void *cookie) {
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update_gc_entry_args *args = (update_gc_entry_args *)cookie;
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if (!strcmp(entry->name, "_gc_module_metadata")) {
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uintptr_t *next = (uintptr_t *)entry->state;
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uint32_t num_safe_points = *(uint32_t *)next;
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next++;
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for (uint32_t i = 0; i < num_safe_points; i++) {
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safe_point sp = { next[0], next[1], next[2] };
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next += 3;
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args->safe_points->push_back(sp);
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}
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}
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}
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static bool
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cmp_safe_point(safe_point a, safe_point b) {
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return a.safe_point_loc < b.safe_point_loc;
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}
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uintptr_t *global_safe_points = 0;
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void
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update_gc_metadata(const void* map) {
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std::vector<safe_point> safe_points;
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update_gc_entry_args args = { &safe_points };
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// Extract list of safe points from each module.
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iter_crate_map((const cratemap *)map, update_gc_entry, (void *)&args);
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std::sort(safe_points.begin(), safe_points.end(), cmp_safe_point);
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// Serialize safe point list into format expected by runtime.
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global_safe_points =
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(uintptr_t *)malloc((safe_points.size()*3 + 1)*sizeof(uintptr_t));
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if (!global_safe_points) return;
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uintptr_t *next = global_safe_points;
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*next = safe_points.size();
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next++;
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for (uint32_t i = 0; i < safe_points.size(); i++) {
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next[0] = safe_points[i].safe_point_loc;
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next[1] = safe_points[i].safe_point_meta;
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next[2] = safe_points[i].function_meta;
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next += 3;
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}
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}
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extern "C" CDECL void *
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rust_gc_metadata() {
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return (void *)global_safe_points;
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}
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//
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// Local Variables:
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// mode: C++
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// fill-column: 78;
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// indent-tabs-mode: nil
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// c-basic-offset: 4
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// buffer-file-coding-system: utf-8-unix
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// End:
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//
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