Add preliminary source mapping to parser (always on)

core/compile.c

@@ -0,0 +1,66 @@
+/*
+* Copyright (c) 2017 Calvin Rose
+*
+* Permission is hereby granted, free of charge, to any person obtaining a copy
+* of this software and associated documentation files (the "Software"), to
+* deal in the Software without restriction, including without limitation the
+* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+* sell copies of the Software, and to permit persons to whom the Software is
+* furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in
+* all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+* IN THE SOFTWARE.
+*/
+
+#include <dst/dst.h>
+
+#define DST_LOCAL_FLAG_MUTABLE 1
+
+/* Compiler typedefs */
+typedef struct DstCompiler DstCompiler;
+typedef struct FormOptions FormOptions;
+typedef struct SlotTracker SlotTracker;
+typedef struct DstScope DstScope;
+
+/* A stack slot */
+struct DstSlot {
+    int32_t index;
+    uint32_t flags;
+    uint32_t types; /* bit set of possible primitive types */
+}
+
+/* A lexical scope during compilation */
+struct DstScope {
+    DstArray slots;
+    DstArray freeslots;
+    DstArray constants;
+    DstTable symbols; /* Positive numbers are stack slots, negative are negative constant indices */
+    uint32_t flags;
+    int32_t nextslot;
+}
+
+/* Compilation state */
+struct DstCompiler {
+    DstValue error;
+    jmp_buf on_error;
+    DstArray scopes;
+    DstBuffer buffer;
+    int recursion_guard;
+};
+
+/* Compiler state */
+struct DstFormOptions {
+    DstCompiler *compiler;
+    DstValue x;
+    uint32_t flags;
+    uint32_t types; /* bit set of accepeted primitive types */
+    int32_t target_slot;
+};