patch 8.2.0149: maintaining a Vim9 branch separately is more work
Problem: Maintaining a Vim9 branch separately is more work.
Solution: Merge the Vim9 script changes.
diff --git a/src/vim9compile.c b/src/vim9compile.c
new file mode 100644
index 0000000..9f273c5
--- /dev/null
+++ b/src/vim9compile.c
@@ -0,0 +1,4612 @@
+/* vi:set ts=8 sts=4 sw=4 noet:
+ *
+ * VIM - Vi IMproved by Bram Moolenaar
+ *
+ * Do ":help uganda" in Vim to read copying and usage conditions.
+ * Do ":help credits" in Vim to see a list of people who contributed.
+ * See README.txt for an overview of the Vim source code.
+ */
+
+/*
+ * vim9compile.c: :def and dealing with instructions
+ */
+
+#define USING_FLOAT_STUFF
+#include "vim.h"
+
+#if defined(FEAT_EVAL) || defined(PROTO)
+
+#ifdef VMS
+# include <float.h>
+#endif
+
+#define DEFINE_VIM9_GLOBALS
+#include "vim9.h"
+
+/*
+ * Chain of jump instructions where the end label needs to be set.
+ */
+typedef struct endlabel_S endlabel_T;
+struct endlabel_S {
+ endlabel_T *el_next; // chain end_label locations
+ int el_end_label; // instruction idx where to set end
+};
+
+/*
+ * info specific for the scope of :if / elseif / else
+ */
+typedef struct {
+ int is_if_label; // instruction idx at IF or ELSEIF
+ endlabel_T *is_end_label; // instructions to set end label
+} ifscope_T;
+
+/*
+ * info specific for the scope of :while
+ */
+typedef struct {
+ int ws_top_label; // instruction idx at WHILE
+ endlabel_T *ws_end_label; // instructions to set end
+} whilescope_T;
+
+/*
+ * info specific for the scope of :for
+ */
+typedef struct {
+ int fs_top_label; // instruction idx at FOR
+ endlabel_T *fs_end_label; // break instructions
+} forscope_T;
+
+/*
+ * info specific for the scope of :try
+ */
+typedef struct {
+ int ts_try_label; // instruction idx at TRY
+ endlabel_T *ts_end_label; // jump to :finally or :endtry
+ int ts_catch_label; // instruction idx of last CATCH
+ int ts_caught_all; // "catch" without argument encountered
+} tryscope_T;
+
+typedef enum {
+ NO_SCOPE,
+ IF_SCOPE,
+ WHILE_SCOPE,
+ FOR_SCOPE,
+ TRY_SCOPE,
+ BLOCK_SCOPE
+} scopetype_T;
+
+/*
+ * Info for one scope, pointed to by "ctx_scope".
+ */
+typedef struct scope_S scope_T;
+struct scope_S {
+ scope_T *se_outer; // scope containing this one
+ scopetype_T se_type;
+ int se_local_count; // ctx_locals.ga_len before scope
+ union {
+ ifscope_T se_if;
+ whilescope_T se_while;
+ forscope_T se_for;
+ tryscope_T se_try;
+ };
+};
+
+/*
+ * Entry for "ctx_locals". Used for arguments and local variables.
+ */
+typedef struct {
+ char_u *lv_name;
+ type_T *lv_type;
+ int lv_const; // when TRUE cannot be assigned to
+ int lv_arg; // when TRUE this is an argument
+} lvar_T;
+
+/*
+ * Context for compiling lines of Vim script.
+ * Stores info about the local variables and condition stack.
+ */
+struct cctx_S {
+ ufunc_T *ctx_ufunc; // current function
+ int ctx_lnum; // line number in current function
+ garray_T ctx_instr; // generated instructions
+
+ garray_T ctx_locals; // currently visible local variables
+ int ctx_max_local; // maximum number of locals at one time
+
+ garray_T ctx_imports; // imported items
+
+ scope_T *ctx_scope; // current scope, NULL at toplevel
+
+ garray_T ctx_type_stack; // type of each item on the stack
+ garray_T *ctx_type_list; // space for adding types
+};
+
+static char e_var_notfound[] = N_("E1001: variable not found: %s");
+static char e_syntax_at[] = N_("E1002: Syntax error at %s");
+
+static int compile_expr1(char_u **arg, cctx_T *cctx);
+static int compile_expr2(char_u **arg, cctx_T *cctx);
+static int compile_expr3(char_u **arg, cctx_T *cctx);
+
+/*
+ * Lookup variable "name" in the local scope and return the index.
+ */
+ static int
+lookup_local(char_u *name, size_t len, cctx_T *cctx)
+{
+ int idx;
+
+ if (len <= 0)
+ return -1;
+ for (idx = 0; idx < cctx->ctx_locals.ga_len; ++idx)
+ {
+ lvar_T *lvar = ((lvar_T *)cctx->ctx_locals.ga_data) + idx;
+
+ if (STRNCMP(name, lvar->lv_name, len) == 0
+ && STRLEN(lvar->lv_name) == len)
+ return idx;
+ }
+ return -1;
+}
+
+/*
+ * Lookup an argument in the current function.
+ * Returns the argument index or -1 if not found.
+ */
+ static int
+lookup_arg(char_u *name, size_t len, cctx_T *cctx)
+{
+ int idx;
+
+ if (len <= 0)
+ return -1;
+ for (idx = 0; idx < cctx->ctx_ufunc->uf_args.ga_len; ++idx)
+ {
+ char_u *arg = FUNCARG(cctx->ctx_ufunc, idx);
+
+ if (STRNCMP(name, arg, len) == 0 && STRLEN(arg) == len)
+ return idx;
+ }
+ return -1;
+}
+
+/*
+ * Lookup a vararg argument in the current function.
+ * Returns TRUE if there is a match.
+ */
+ static int
+lookup_vararg(char_u *name, size_t len, cctx_T *cctx)
+{
+ char_u *va_name = cctx->ctx_ufunc->uf_va_name;
+
+ return len > 0 && va_name != NULL
+ && STRNCMP(name, va_name, len) == 0 && STRLEN(va_name) == len;
+}
+
+/*
+ * Lookup a variable in the current script.
+ * Returns OK or FAIL.
+ */
+ static int
+lookup_script(char_u *name, size_t len)
+{
+ int cc;
+ hashtab_T *ht = &SCRIPT_VARS(current_sctx.sc_sid);
+ dictitem_T *di;
+
+ cc = name[len];
+ name[len] = NUL;
+ di = find_var_in_ht(ht, 0, name, TRUE);
+ name[len] = cc;
+ return di == NULL ? FAIL: OK;
+}
+
+ static type_T *
+get_list_type(type_T *member_type, garray_T *type_list)
+{
+ type_T *type;
+
+ // recognize commonly used types
+ if (member_type->tt_type == VAR_UNKNOWN)
+ return &t_list_any;
+ if (member_type->tt_type == VAR_NUMBER)
+ return &t_list_number;
+ if (member_type->tt_type == VAR_STRING)
+ return &t_list_string;
+
+ // Not a common type, create a new entry.
+ if (ga_grow(type_list, 1) == FAIL)
+ return FAIL;
+ type = ((type_T *)type_list->ga_data) + type_list->ga_len;
+ ++type_list->ga_len;
+ type->tt_type = VAR_LIST;
+ type->tt_member = member_type;
+ return type;
+}
+
+ static type_T *
+get_dict_type(type_T *member_type, garray_T *type_list)
+{
+ type_T *type;
+
+ // recognize commonly used types
+ if (member_type->tt_type == VAR_UNKNOWN)
+ return &t_dict_any;
+ if (member_type->tt_type == VAR_NUMBER)
+ return &t_dict_number;
+ if (member_type->tt_type == VAR_STRING)
+ return &t_dict_string;
+
+ // Not a common type, create a new entry.
+ if (ga_grow(type_list, 1) == FAIL)
+ return FAIL;
+ type = ((type_T *)type_list->ga_data) + type_list->ga_len;
+ ++type_list->ga_len;
+ type->tt_type = VAR_DICT;
+ type->tt_member = member_type;
+ return type;
+}
+
+/////////////////////////////////////////////////////////////////////
+// Following generate_ functions expect the caller to call ga_grow().
+
+/*
+ * Generate an instruction without arguments.
+ * Returns a pointer to the new instruction, NULL if failed.
+ */
+ static isn_T *
+generate_instr(cctx_T *cctx, isntype_T isn_type)
+{
+ garray_T *instr = &cctx->ctx_instr;
+ isn_T *isn;
+
+ if (ga_grow(instr, 1) == FAIL)
+ return NULL;
+ isn = ((isn_T *)instr->ga_data) + instr->ga_len;
+ isn->isn_type = isn_type;
+ isn->isn_lnum = cctx->ctx_lnum + 1;
+ ++instr->ga_len;
+
+ return isn;
+}
+
+/*
+ * Generate an instruction without arguments.
+ * "drop" will be removed from the stack.
+ * Returns a pointer to the new instruction, NULL if failed.
+ */
+ static isn_T *
+generate_instr_drop(cctx_T *cctx, isntype_T isn_type, int drop)
+{
+ garray_T *stack = &cctx->ctx_type_stack;
+
+ stack->ga_len -= drop;
+ return generate_instr(cctx, isn_type);
+}
+
+/*
+ * Generate instruction "isn_type" and put "type" on the type stack.
+ */
+ static isn_T *
+generate_instr_type(cctx_T *cctx, isntype_T isn_type, type_T *type)
+{
+ isn_T *isn;
+ garray_T *stack = &cctx->ctx_type_stack;
+
+ if ((isn = generate_instr(cctx, isn_type)) == NULL)
+ return NULL;
+
+ if (ga_grow(stack, 1) == FAIL)
+ return NULL;
+ ((type_T **)stack->ga_data)[stack->ga_len] = type;
+ ++stack->ga_len;
+
+ return isn;
+}
+
+/*
+ * If type at "offset" isn't already VAR_STRING then generate ISN_2STRING.
+ */
+ static int
+may_generate_2STRING(int offset, cctx_T *cctx)
+{
+ isn_T *isn;
+ garray_T *stack = &cctx->ctx_type_stack;
+ type_T **type = ((type_T **)stack->ga_data) + stack->ga_len + offset;
+
+ if ((*type)->tt_type == VAR_STRING)
+ return OK;
+ *type = &t_string;
+
+ if ((isn = generate_instr(cctx, ISN_2STRING)) == NULL)
+ return FAIL;
+ isn->isn_arg.number = offset;
+
+ return OK;
+}
+
+ static int
+check_number_or_float(vartype_T type1, vartype_T type2, char_u *op)
+{
+ if (!((type1 == VAR_NUMBER || type1 == VAR_FLOAT || type1 == VAR_UNKNOWN)
+ && (type2 == VAR_NUMBER || type2 == VAR_FLOAT
+ || type2 == VAR_UNKNOWN)))
+ {
+ if (*op == '+')
+ semsg(_("E1035: wrong argument type for +"));
+ else
+ semsg(_("E1036: %c requires number or float arguments"), *op);
+ return FAIL;
+ }
+ return OK;
+}
+
+/*
+ * Generate an instruction with two arguments. The instruction depends on the
+ * type of the arguments.
+ */
+ static int
+generate_two_op(cctx_T *cctx, char_u *op)
+{
+ garray_T *stack = &cctx->ctx_type_stack;
+ type_T *type1;
+ type_T *type2;
+ vartype_T vartype;
+ isn_T *isn;
+
+ // Get the known type of the two items on the stack. If they are matching
+ // use a type-specific instruction. Otherwise fall back to runtime type
+ // checking.
+ type1 = ((type_T **)stack->ga_data)[stack->ga_len - 2];
+ type2 = ((type_T **)stack->ga_data)[stack->ga_len - 1];
+ vartype = VAR_UNKNOWN;
+ if (type1->tt_type == type2->tt_type
+ && (type1->tt_type == VAR_NUMBER
+ || type1->tt_type == VAR_LIST
+#ifdef FEAT_FLOAT
+ || type1->tt_type == VAR_FLOAT
+#endif
+ || type1->tt_type == VAR_BLOB))
+ vartype = type1->tt_type;
+
+ switch (*op)
+ {
+ case '+': if (vartype != VAR_LIST && vartype != VAR_BLOB
+ && check_number_or_float(
+ type1->tt_type, type2->tt_type, op) == FAIL)
+ return FAIL;
+ isn = generate_instr_drop(cctx,
+ vartype == VAR_NUMBER ? ISN_OPNR
+ : vartype == VAR_LIST ? ISN_ADDLIST
+ : vartype == VAR_BLOB ? ISN_ADDBLOB
+#ifdef FEAT_FLOAT
+ : vartype == VAR_FLOAT ? ISN_OPFLOAT
+#endif
+ : ISN_OPANY, 1);
+ if (isn != NULL)
+ isn->isn_arg.op.op_type = EXPR_ADD;
+ break;
+
+ case '-':
+ case '*':
+ case '/': if (check_number_or_float(type1->tt_type, type2->tt_type,
+ op) == FAIL)
+ return FAIL;
+ if (vartype == VAR_NUMBER)
+ isn = generate_instr_drop(cctx, ISN_OPNR, 1);
+#ifdef FEAT_FLOAT
+ else if (vartype == VAR_FLOAT)
+ isn = generate_instr_drop(cctx, ISN_OPFLOAT, 1);
+#endif
+ else
+ isn = generate_instr_drop(cctx, ISN_OPANY, 1);
+ if (isn != NULL)
+ isn->isn_arg.op.op_type = *op == '*'
+ ? EXPR_MULT : *op == '/'? EXPR_DIV : EXPR_SUB;
+ break;
+
+ case '%': if ((type1->tt_type != VAR_UNKNOWN
+ && type1->tt_type != VAR_NUMBER)
+ || (type2->tt_type != VAR_UNKNOWN
+ && type2->tt_type != VAR_NUMBER))
+ {
+ emsg(_("E1035: % requires number arguments"));
+ return FAIL;
+ }
+ isn = generate_instr_drop(cctx,
+ vartype == VAR_NUMBER ? ISN_OPNR : ISN_OPANY, 1);
+ if (isn != NULL)
+ isn->isn_arg.op.op_type = EXPR_REM;
+ break;
+ }
+
+ // correct type of result
+ if (vartype == VAR_UNKNOWN)
+ {
+ type_T *type = &t_any;
+
+#ifdef FEAT_FLOAT
+ // float+number and number+float results in float
+ if ((type1->tt_type == VAR_NUMBER || type1->tt_type == VAR_FLOAT)
+ && (type2->tt_type == VAR_NUMBER || type2->tt_type == VAR_FLOAT))
+ type = &t_float;
+#endif
+ ((type_T **)stack->ga_data)[stack->ga_len - 1] = type;
+ }
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_COMPARE* instruction with a boolean result.
+ */
+ static int
+generate_COMPARE(cctx_T *cctx, exptype_T exptype, int ic)
+{
+ isntype_T isntype = ISN_DROP;
+ isn_T *isn;
+ garray_T *stack = &cctx->ctx_type_stack;
+ vartype_T type1;
+ vartype_T type2;
+
+ // Get the known type of the two items on the stack. If they are matching
+ // use a type-specific instruction. Otherwise fall back to runtime type
+ // checking.
+ type1 = ((type_T **)stack->ga_data)[stack->ga_len - 2]->tt_type;
+ type2 = ((type_T **)stack->ga_data)[stack->ga_len - 1]->tt_type;
+ if (type1 == type2)
+ {
+ switch (type1)
+ {
+ case VAR_BOOL: isntype = ISN_COMPAREBOOL; break;
+ case VAR_SPECIAL: isntype = ISN_COMPARESPECIAL; break;
+ case VAR_NUMBER: isntype = ISN_COMPARENR; break;
+ case VAR_FLOAT: isntype = ISN_COMPAREFLOAT; break;
+ case VAR_STRING: isntype = ISN_COMPARESTRING; break;
+ case VAR_BLOB: isntype = ISN_COMPAREBLOB; break;
+ case VAR_LIST: isntype = ISN_COMPARELIST; break;
+ case VAR_DICT: isntype = ISN_COMPAREDICT; break;
+ case VAR_FUNC: isntype = ISN_COMPAREFUNC; break;
+ case VAR_PARTIAL: isntype = ISN_COMPAREPARTIAL; break;
+ default: isntype = ISN_COMPAREANY; break;
+ }
+ }
+ else if (type1 == VAR_UNKNOWN || type2 == VAR_UNKNOWN
+ || ((type1 == VAR_NUMBER || type1 == VAR_FLOAT)
+ && (type2 == VAR_NUMBER || type2 ==VAR_FLOAT)))
+ isntype = ISN_COMPAREANY;
+
+ if ((exptype == EXPR_IS || exptype == EXPR_ISNOT)
+ && (isntype == ISN_COMPAREBOOL
+ || isntype == ISN_COMPARESPECIAL
+ || isntype == ISN_COMPARENR
+ || isntype == ISN_COMPAREFLOAT))
+ {
+ semsg(_("E1037: Cannot use \"%s\" with %s"),
+ exptype == EXPR_IS ? "is" : "isnot" , vartype_name(type1));
+ return FAIL;
+ }
+ if (isntype == ISN_DROP
+ || ((exptype != EXPR_EQUAL && exptype != EXPR_NEQUAL
+ && (type1 == VAR_BOOL || type1 == VAR_SPECIAL
+ || type2 == VAR_BOOL || type2 == VAR_SPECIAL)))
+ || ((exptype != EXPR_EQUAL && exptype != EXPR_NEQUAL
+ && exptype != EXPR_IS && exptype != EXPR_ISNOT
+ && (type1 == VAR_BLOB || type2 == VAR_BLOB
+ || type1 == VAR_LIST || type2 == VAR_LIST))))
+ {
+ semsg(_("E1037: Cannot compare %s with %s"),
+ vartype_name(type1), vartype_name(type2));
+ return FAIL;
+ }
+
+ if ((isn = generate_instr(cctx, isntype)) == NULL)
+ return FAIL;
+ isn->isn_arg.op.op_type = exptype;
+ isn->isn_arg.op.op_ic = ic;
+
+ // takes two arguments, puts one bool back
+ if (stack->ga_len >= 2)
+ {
+ --stack->ga_len;
+ ((type_T **)stack->ga_data)[stack->ga_len - 1] = &t_bool;
+ }
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_2BOOL instruction.
+ */
+ static int
+generate_2BOOL(cctx_T *cctx, int invert)
+{
+ isn_T *isn;
+ garray_T *stack = &cctx->ctx_type_stack;
+
+ if ((isn = generate_instr(cctx, ISN_2BOOL)) == NULL)
+ return FAIL;
+ isn->isn_arg.number = invert;
+
+ // type becomes bool
+ ((type_T **)stack->ga_data)[stack->ga_len - 1] = &t_bool;
+
+ return OK;
+}
+
+ static int
+generate_TYPECHECK(cctx_T *cctx, type_T *vartype, int offset)
+{
+ isn_T *isn;
+ garray_T *stack = &cctx->ctx_type_stack;
+
+ if ((isn = generate_instr(cctx, ISN_CHECKTYPE)) == NULL)
+ return FAIL;
+ isn->isn_arg.type.ct_type = vartype->tt_type; // TODO: whole type
+ isn->isn_arg.type.ct_off = offset;
+
+ // type becomes vartype
+ ((type_T **)stack->ga_data)[stack->ga_len - 1] = vartype;
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_PUSHNR instruction.
+ */
+ static int
+generate_PUSHNR(cctx_T *cctx, varnumber_T number)
+{
+ isn_T *isn;
+
+ if ((isn = generate_instr_type(cctx, ISN_PUSHNR, &t_number)) == NULL)
+ return FAIL;
+ isn->isn_arg.number = number;
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_PUSHBOOL instruction.
+ */
+ static int
+generate_PUSHBOOL(cctx_T *cctx, varnumber_T number)
+{
+ isn_T *isn;
+
+ if ((isn = generate_instr_type(cctx, ISN_PUSHBOOL, &t_bool)) == NULL)
+ return FAIL;
+ isn->isn_arg.number = number;
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_PUSHSPEC instruction.
+ */
+ static int
+generate_PUSHSPEC(cctx_T *cctx, varnumber_T number)
+{
+ isn_T *isn;
+
+ if ((isn = generate_instr_type(cctx, ISN_PUSHSPEC, &t_special)) == NULL)
+ return FAIL;
+ isn->isn_arg.number = number;
+
+ return OK;
+}
+
+#ifdef FEAT_FLOAT
+/*
+ * Generate an ISN_PUSHF instruction.
+ */
+ static int
+generate_PUSHF(cctx_T *cctx, float_T fnumber)
+{
+ isn_T *isn;
+
+ if ((isn = generate_instr_type(cctx, ISN_PUSHF, &t_float)) == NULL)
+ return FAIL;
+ isn->isn_arg.fnumber = fnumber;
+
+ return OK;
+}
+#endif
+
+/*
+ * Generate an ISN_PUSHS instruction.
+ * Consumes "str".
+ */
+ static int
+generate_PUSHS(cctx_T *cctx, char_u *str)
+{
+ isn_T *isn;
+
+ if ((isn = generate_instr_type(cctx, ISN_PUSHS, &t_string)) == NULL)
+ return FAIL;
+ isn->isn_arg.string = str;
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_PUSHBLOB instruction.
+ * Consumes "blob".
+ */
+ static int
+generate_PUSHBLOB(cctx_T *cctx, blob_T *blob)
+{
+ isn_T *isn;
+
+ if ((isn = generate_instr_type(cctx, ISN_PUSHBLOB, &t_blob)) == NULL)
+ return FAIL;
+ isn->isn_arg.blob = blob;
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_STORE instruction.
+ */
+ static int
+generate_STORE(cctx_T *cctx, isntype_T isn_type, int idx, char_u *name)
+{
+ isn_T *isn;
+
+ if ((isn = generate_instr_drop(cctx, isn_type, 1)) == NULL)
+ return FAIL;
+ if (name != NULL)
+ isn->isn_arg.string = vim_strsave(name);
+ else
+ isn->isn_arg.number = idx;
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_STORENR instruction (short for ISN_PUSHNR + ISN_STORE)
+ */
+ static int
+generate_STORENR(cctx_T *cctx, int idx, varnumber_T value)
+{
+ isn_T *isn;
+
+ if ((isn = generate_instr(cctx, ISN_STORENR)) == NULL)
+ return FAIL;
+ isn->isn_arg.storenr.str_idx = idx;
+ isn->isn_arg.storenr.str_val = value;
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_STOREOPT instruction
+ */
+ static int
+generate_STOREOPT(cctx_T *cctx, char_u *name, int opt_flags)
+{
+ isn_T *isn;
+
+ if ((isn = generate_instr(cctx, ISN_STOREOPT)) == NULL)
+ return FAIL;
+ isn->isn_arg.storeopt.so_name = vim_strsave(name);
+ isn->isn_arg.storeopt.so_flags = opt_flags;
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_LOAD or similar instruction.
+ */
+ static int
+generate_LOAD(
+ cctx_T *cctx,
+ isntype_T isn_type,
+ int idx,
+ char_u *name,
+ type_T *type)
+{
+ isn_T *isn;
+
+ if ((isn = generate_instr_type(cctx, isn_type, type)) == NULL)
+ return FAIL;
+ if (name != NULL)
+ isn->isn_arg.string = vim_strsave(name);
+ else
+ isn->isn_arg.number = idx;
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_LOADS instruction.
+ */
+ static int
+generate_LOADS(
+ cctx_T *cctx,
+ char_u *name,
+ int sid)
+{
+ isn_T *isn;
+
+ if ((isn = generate_instr_type(cctx, ISN_LOADS, &t_any)) == NULL)
+ return FAIL;
+ isn->isn_arg.loads.ls_name = vim_strsave(name);
+ isn->isn_arg.loads.ls_sid = sid;
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_LOADSCRIPT or ISN_STORESCRIPT instruction.
+ */
+ static int
+generate_SCRIPT(
+ cctx_T *cctx,
+ isntype_T isn_type,
+ int sid,
+ int idx,
+ type_T *type)
+{
+ isn_T *isn;
+
+ if (isn_type == ISN_LOADSCRIPT)
+ isn = generate_instr_type(cctx, isn_type, type);
+ else
+ isn = generate_instr_drop(cctx, isn_type, 1);
+ if (isn == NULL)
+ return FAIL;
+ isn->isn_arg.script.script_sid = sid;
+ isn->isn_arg.script.script_idx = idx;
+ return OK;
+}
+
+/*
+ * Generate an ISN_NEWLIST instruction.
+ */
+ static int
+generate_NEWLIST(cctx_T *cctx, int count)
+{
+ isn_T *isn;
+ garray_T *stack = &cctx->ctx_type_stack;
+ garray_T *type_list = cctx->ctx_type_list;
+ type_T *type;
+ type_T *member;
+
+ if ((isn = generate_instr(cctx, ISN_NEWLIST)) == NULL)
+ return FAIL;
+ isn->isn_arg.number = count;
+
+ // drop the value types
+ stack->ga_len -= count;
+
+ // use the first value type for the list member type
+ if (count > 0)
+ member = ((type_T **)stack->ga_data)[stack->ga_len];
+ else
+ member = &t_any;
+ type = get_list_type(member, type_list);
+
+ // add the list type to the type stack
+ if (ga_grow(stack, 1) == FAIL)
+ return FAIL;
+ ((type_T **)stack->ga_data)[stack->ga_len] = type;
+ ++stack->ga_len;
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_NEWDICT instruction.
+ */
+ static int
+generate_NEWDICT(cctx_T *cctx, int count)
+{
+ isn_T *isn;
+ garray_T *stack = &cctx->ctx_type_stack;
+ garray_T *type_list = cctx->ctx_type_list;
+ type_T *type;
+ type_T *member;
+
+ if ((isn = generate_instr(cctx, ISN_NEWDICT)) == NULL)
+ return FAIL;
+ isn->isn_arg.number = count;
+
+ // drop the key and value types
+ stack->ga_len -= 2 * count;
+
+ // use the first value type for the list member type
+ if (count > 0)
+ member = ((type_T **)stack->ga_data)[stack->ga_len + 1];
+ else
+ member = &t_any;
+ type = get_dict_type(member, type_list);
+
+ // add the dict type to the type stack
+ if (ga_grow(stack, 1) == FAIL)
+ return FAIL;
+ ((type_T **)stack->ga_data)[stack->ga_len] = type;
+ ++stack->ga_len;
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_FUNCREF instruction.
+ */
+ static int
+generate_FUNCREF(cctx_T *cctx, int dfunc_idx)
+{
+ isn_T *isn;
+ garray_T *stack = &cctx->ctx_type_stack;
+
+ if ((isn = generate_instr(cctx, ISN_FUNCREF)) == NULL)
+ return FAIL;
+ isn->isn_arg.number = dfunc_idx;
+
+ if (ga_grow(stack, 1) == FAIL)
+ return FAIL;
+ ((type_T **)stack->ga_data)[stack->ga_len] = &t_partial_any;
+ // TODO: argument and return types
+ ++stack->ga_len;
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_JUMP instruction.
+ */
+ static int
+generate_JUMP(cctx_T *cctx, jumpwhen_T when, int where)
+{
+ isn_T *isn;
+ garray_T *stack = &cctx->ctx_type_stack;
+
+ if ((isn = generate_instr(cctx, ISN_JUMP)) == NULL)
+ return FAIL;
+ isn->isn_arg.jump.jump_when = when;
+ isn->isn_arg.jump.jump_where = where;
+
+ if (when != JUMP_ALWAYS && stack->ga_len > 0)
+ --stack->ga_len;
+
+ return OK;
+}
+
+ static int
+generate_FOR(cctx_T *cctx, int loop_idx)
+{
+ isn_T *isn;
+ garray_T *stack = &cctx->ctx_type_stack;
+
+ if ((isn = generate_instr(cctx, ISN_FOR)) == NULL)
+ return FAIL;
+ isn->isn_arg.forloop.for_idx = loop_idx;
+
+ if (ga_grow(stack, 1) == FAIL)
+ return FAIL;
+ // type doesn't matter, will be stored next
+ ((type_T **)stack->ga_data)[stack->ga_len] = &t_any;
+ ++stack->ga_len;
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_BCALL instruction.
+ * Return FAIL if the number of arguments is wrong.
+ */
+ static int
+generate_BCALL(cctx_T *cctx, int func_idx, int argcount)
+{
+ isn_T *isn;
+ garray_T *stack = &cctx->ctx_type_stack;
+
+ if (check_internal_func(func_idx, argcount) == FAIL)
+ return FAIL;
+
+ if ((isn = generate_instr(cctx, ISN_BCALL)) == NULL)
+ return FAIL;
+ isn->isn_arg.bfunc.cbf_idx = func_idx;
+ isn->isn_arg.bfunc.cbf_argcount = argcount;
+
+ stack->ga_len -= argcount; // drop the arguments
+ if (ga_grow(stack, 1) == FAIL)
+ return FAIL;
+ ((type_T **)stack->ga_data)[stack->ga_len] =
+ internal_func_ret_type(func_idx, argcount);
+ ++stack->ga_len; // add return value
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_DCALL or ISN_UCALL instruction.
+ * Return FAIL if the number of arguments is wrong.
+ */
+ static int
+generate_CALL(cctx_T *cctx, ufunc_T *ufunc, int argcount)
+{
+ isn_T *isn;
+ garray_T *stack = &cctx->ctx_type_stack;
+ int regular_args = ufunc->uf_args.ga_len;
+
+ if (argcount > regular_args && !has_varargs(ufunc))
+ {
+ semsg(_(e_toomanyarg), ufunc->uf_name);
+ return FAIL;
+ }
+ if (argcount < regular_args - ufunc->uf_def_args.ga_len)
+ {
+ semsg(_(e_toofewarg), ufunc->uf_name);
+ return FAIL;
+ }
+
+ // Turn varargs into a list.
+ if (ufunc->uf_va_name != NULL)
+ {
+ int count = argcount - regular_args;
+
+ // TODO: add default values for optional arguments?
+ generate_NEWLIST(cctx, count < 0 ? 0 : count);
+ argcount = regular_args + 1;
+ }
+
+ if ((isn = generate_instr(cctx,
+ ufunc->uf_dfunc_idx >= 0 ? ISN_DCALL : ISN_UCALL)) == NULL)
+ return FAIL;
+ if (ufunc->uf_dfunc_idx >= 0)
+ {
+ isn->isn_arg.dfunc.cdf_idx = ufunc->uf_dfunc_idx;
+ isn->isn_arg.dfunc.cdf_argcount = argcount;
+ }
+ else
+ {
+ // A user function may be deleted and redefined later, can't use the
+ // ufunc pointer, need to look it up again at runtime.
+ isn->isn_arg.ufunc.cuf_name = vim_strsave(ufunc->uf_name);
+ isn->isn_arg.ufunc.cuf_argcount = argcount;
+ }
+
+ stack->ga_len -= argcount; // drop the arguments
+ if (ga_grow(stack, 1) == FAIL)
+ return FAIL;
+ // add return value
+ ((type_T **)stack->ga_data)[stack->ga_len] = ufunc->uf_ret_type;
+ ++stack->ga_len;
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_UCALL instruction when the function isn't defined yet.
+ */
+ static int
+generate_UCALL(cctx_T *cctx, char_u *name, int argcount)
+{
+ isn_T *isn;
+ garray_T *stack = &cctx->ctx_type_stack;
+
+ if ((isn = generate_instr(cctx, ISN_UCALL)) == NULL)
+ return FAIL;
+ isn->isn_arg.ufunc.cuf_name = vim_strsave(name);
+ isn->isn_arg.ufunc.cuf_argcount = argcount;
+
+ stack->ga_len -= argcount; // drop the arguments
+
+ // drop the funcref/partial, get back the return value
+ ((type_T **)stack->ga_data)[stack->ga_len - 1] = &t_any;
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_PCALL instruction.
+ */
+ static int
+generate_PCALL(cctx_T *cctx, int argcount, int at_top)
+{
+ isn_T *isn;
+ garray_T *stack = &cctx->ctx_type_stack;
+
+ if ((isn = generate_instr(cctx, ISN_PCALL)) == NULL)
+ return FAIL;
+ isn->isn_arg.pfunc.cpf_top = at_top;
+ isn->isn_arg.pfunc.cpf_argcount = argcount;
+
+ stack->ga_len -= argcount; // drop the arguments
+
+ // drop the funcref/partial, get back the return value
+ ((type_T **)stack->ga_data)[stack->ga_len - 1] = &t_any;
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_MEMBER instruction.
+ */
+ static int
+generate_MEMBER(cctx_T *cctx, char_u *name, size_t len)
+{
+ isn_T *isn;
+ garray_T *stack = &cctx->ctx_type_stack;
+ type_T *type;
+
+ if ((isn = generate_instr(cctx, ISN_MEMBER)) == NULL)
+ return FAIL;
+ isn->isn_arg.string = vim_strnsave(name, (int)len);
+
+ // change dict type to dict member type
+ type = ((type_T **)stack->ga_data)[stack->ga_len - 1];
+ ((type_T **)stack->ga_data)[stack->ga_len - 1] = type->tt_member;
+
+ return OK;
+}
+
+/*
+ * Generate an ISN_ECHO instruction.
+ */
+ static int
+generate_ECHO(cctx_T *cctx, int with_white, int count)
+{
+ isn_T *isn;
+
+ if ((isn = generate_instr_drop(cctx, ISN_ECHO, count)) == NULL)
+ return FAIL;
+ isn->isn_arg.echo.echo_with_white = with_white;
+ isn->isn_arg.echo.echo_count = count;
+
+ return OK;
+}
+
+ static int
+generate_EXEC(cctx_T *cctx, char_u *line)
+{
+ isn_T *isn;
+
+ if ((isn = generate_instr(cctx, ISN_EXEC)) == NULL)
+ return FAIL;
+ isn->isn_arg.string = vim_strsave(line);
+ return OK;
+}
+
+static char e_white_both[] =
+ N_("E1004: white space required before and after '%s'");
+
+/*
+ * Reserve space for a local variable.
+ * Return the index or -1 if it failed.
+ */
+ static int
+reserve_local(cctx_T *cctx, char_u *name, size_t len, int isConst, type_T *type)
+{
+ int idx;
+ lvar_T *lvar;
+
+ if (lookup_arg(name, len, cctx) >= 0 || lookup_vararg(name, len, cctx))
+ {
+ emsg_namelen(_("E1006: %s is used as an argument"), name, (int)len);
+ return -1;
+ }
+
+ if (ga_grow(&cctx->ctx_locals, 1) == FAIL)
+ return -1;
+ idx = cctx->ctx_locals.ga_len;
+ if (cctx->ctx_max_local < idx + 1)
+ cctx->ctx_max_local = idx + 1;
+ ++cctx->ctx_locals.ga_len;
+
+ lvar = ((lvar_T *)cctx->ctx_locals.ga_data) + idx;
+ lvar->lv_name = vim_strnsave(name, (int)(len == 0 ? STRLEN(name) : len));
+ lvar->lv_const = isConst;
+ lvar->lv_type = type;
+
+ return idx;
+}
+
+/*
+ * Skip over a type definition and return a pointer to just after it.
+ */
+ char_u *
+skip_type(char_u *start)
+{
+ char_u *p = start;
+
+ while (ASCII_ISALNUM(*p) || *p == '_')
+ ++p;
+
+ // Skip over "<type>"; this is permissive about white space.
+ if (*skipwhite(p) == '<')
+ {
+ p = skipwhite(p);
+ p = skip_type(skipwhite(p + 1));
+ p = skipwhite(p);
+ if (*p == '>')
+ ++p;
+ }
+ return p;
+}
+
+/*
+ * Parse the member type: "<type>" and return "type" with the member set.
+ * Use "type_list" if a new type needs to be added.
+ * Returns NULL in case of failure.
+ */
+ static type_T *
+parse_type_member(char_u **arg, type_T *type, garray_T *type_list)
+{
+ type_T *member_type;
+
+ if (**arg != '<')
+ {
+ if (*skipwhite(*arg) == '<')
+ emsg(_("E1007: No white space allowed before <"));
+ else
+ emsg(_("E1008: Missing <type>"));
+ return NULL;
+ }
+ *arg = skipwhite(*arg + 1);
+
+ member_type = parse_type(arg, type_list);
+ if (member_type == NULL)
+ return NULL;
+
+ *arg = skipwhite(*arg);
+ if (**arg != '>')
+ {
+ emsg(_("E1009: Missing > after type"));
+ return NULL;
+ }
+ ++*arg;
+
+ if (type->tt_type == VAR_LIST)
+ return get_list_type(member_type, type_list);
+ return get_dict_type(member_type, type_list);
+}
+
+/*
+ * Parse a type at "arg" and advance over it.
+ * Return NULL for failure.
+ */
+ type_T *
+parse_type(char_u **arg, garray_T *type_list)
+{
+ char_u *p = *arg;
+ size_t len;
+
+ // skip over the first word
+ while (ASCII_ISALNUM(*p) || *p == '_')
+ ++p;
+ len = p - *arg;
+
+ switch (**arg)
+ {
+ case 'a':
+ if (len == 3 && STRNCMP(*arg, "any", len) == 0)
+ {
+ *arg += len;
+ return &t_any;
+ }
+ break;
+ case 'b':
+ if (len == 4 && STRNCMP(*arg, "bool", len) == 0)
+ {
+ *arg += len;
+ return &t_bool;
+ }
+ if (len == 4 && STRNCMP(*arg, "blob", len) == 0)
+ {
+ *arg += len;
+ return &t_blob;
+ }
+ break;
+ case 'c':
+ if (len == 7 && STRNCMP(*arg, "channel", len) == 0)
+ {
+ *arg += len;
+ return &t_channel;
+ }
+ break;
+ case 'd':
+ if (len == 4 && STRNCMP(*arg, "dict", len) == 0)
+ {
+ *arg += len;
+ return parse_type_member(arg, &t_dict_any, type_list);
+ }
+ break;
+ case 'f':
+ if (len == 5 && STRNCMP(*arg, "float", len) == 0)
+ {
+ *arg += len;
+ return &t_float;
+ }
+ if (len == 4 && STRNCMP(*arg, "func", len) == 0)
+ {
+ *arg += len;
+ // TODO: arguments and return type
+ return &t_func_any;
+ }
+ break;
+ case 'j':
+ if (len == 3 && STRNCMP(*arg, "job", len) == 0)
+ {
+ *arg += len;
+ return &t_job;
+ }
+ break;
+ case 'l':
+ if (len == 4 && STRNCMP(*arg, "list", len) == 0)
+ {
+ *arg += len;
+ return parse_type_member(arg, &t_list_any, type_list);
+ }
+ break;
+ case 'n':
+ if (len == 6 && STRNCMP(*arg, "number", len) == 0)
+ {
+ *arg += len;
+ return &t_number;
+ }
+ break;
+ case 'p':
+ if (len == 4 && STRNCMP(*arg, "partial", len) == 0)
+ {
+ *arg += len;
+ // TODO: arguments and return type
+ return &t_partial_any;
+ }
+ break;
+ case 's':
+ if (len == 6 && STRNCMP(*arg, "string", len) == 0)
+ {
+ *arg += len;
+ return &t_string;
+ }
+ break;
+ case 'v':
+ if (len == 4 && STRNCMP(*arg, "void", len) == 0)
+ {
+ *arg += len;
+ return &t_void;
+ }
+ break;
+ }
+
+ semsg(_("E1010: Type not recognized: %s"), *arg);
+ return &t_any;
+}
+
+/*
+ * Check if "type1" and "type2" are exactly the same.
+ */
+ static int
+equal_type(type_T *type1, type_T *type2)
+{
+ if (type1->tt_type != type2->tt_type)
+ return FALSE;
+ switch (type1->tt_type)
+ {
+ case VAR_VOID:
+ case VAR_UNKNOWN:
+ case VAR_SPECIAL:
+ case VAR_BOOL:
+ case VAR_NUMBER:
+ case VAR_FLOAT:
+ case VAR_STRING:
+ case VAR_BLOB:
+ case VAR_JOB:
+ case VAR_CHANNEL:
+ return TRUE; // not composite is always OK
+ case VAR_LIST:
+ case VAR_DICT:
+ return equal_type(type1->tt_member, type2->tt_member);
+ case VAR_FUNC:
+ case VAR_PARTIAL:
+ // TODO; check argument types.
+ return equal_type(type1->tt_member, type2->tt_member)
+ && type1->tt_argcount == type2->tt_argcount;
+ }
+ return TRUE;
+}
+
+/*
+ * Find the common type of "type1" and "type2" and put it in "dest".
+ * "type2" and "dest" may be the same.
+ */
+ static void
+common_type(type_T *type1, type_T *type2, type_T *dest)
+{
+ if (equal_type(type1, type2))
+ {
+ if (dest != type2)
+ *dest = *type2;
+ return;
+ }
+
+ if (type1->tt_type == type2->tt_type)
+ {
+ dest->tt_type = type1->tt_type;
+ if (type1->tt_type == VAR_LIST || type2->tt_type == VAR_DICT)
+ {
+ common_type(type1->tt_member, type2->tt_member, dest->tt_member);
+ return;
+ }
+ // TODO: VAR_FUNC and VAR_PARTIAL
+ }
+
+ dest->tt_type = VAR_UNKNOWN; // "any"
+}
+
+ char *
+vartype_name(vartype_T type)
+{
+ switch (type)
+ {
+ case VAR_VOID: return "void";
+ case VAR_UNKNOWN: return "any";
+ case VAR_SPECIAL: return "special";
+ case VAR_BOOL: return "bool";
+ case VAR_NUMBER: return "number";
+ case VAR_FLOAT: return "float";
+ case VAR_STRING: return "string";
+ case VAR_BLOB: return "blob";
+ case VAR_JOB: return "job";
+ case VAR_CHANNEL: return "channel";
+ case VAR_LIST: return "list";
+ case VAR_DICT: return "dict";
+ case VAR_FUNC: return "function";
+ case VAR_PARTIAL: return "partial";
+ }
+ return "???";
+}
+
+/*
+ * Return the name of a type.
+ * The result may be in allocated memory, in which case "tofree" is set.
+ */
+ char *
+type_name(type_T *type, char **tofree)
+{
+ char *name = vartype_name(type->tt_type);
+
+ *tofree = NULL;
+ if (type->tt_type == VAR_LIST || type->tt_type == VAR_DICT)
+ {
+ char *member_free;
+ char *member_name = type_name(type->tt_member, &member_free);
+ size_t len;
+
+ len = STRLEN(name) + STRLEN(member_name) + 3;
+ *tofree = alloc(len);
+ if (*tofree != NULL)
+ {
+ vim_snprintf(*tofree, len, "%s<%s>", name, member_name);
+ vim_free(member_free);
+ return *tofree;
+ }
+ }
+ // TODO: function and partial argument types
+
+ return name;
+}
+
+/*
+ * Find "name" in script-local items of script "sid".
+ * Returns the index in "sn_var_vals" if found.
+ * If found but not in "sn_var_vals" returns -1.
+ * If not found returns -2.
+ */
+ int
+get_script_item_idx(int sid, char_u *name, int check_writable)
+{
+ hashtab_T *ht;
+ dictitem_T *di;
+ scriptitem_T *si = &SCRIPT_ITEM(sid);
+ int idx;
+
+ // First look the name up in the hashtable.
+ if (sid <= 0 || sid > script_items.ga_len)
+ return -1;
+ ht = &SCRIPT_VARS(sid);
+ di = find_var_in_ht(ht, 0, name, TRUE);
+ if (di == NULL)
+ return -2;
+
+ // Now find the svar_T index in sn_var_vals.
+ for (idx = 0; idx < si->sn_var_vals.ga_len; ++idx)
+ {
+ svar_T *sv = ((svar_T *)si->sn_var_vals.ga_data) + idx;
+
+ if (sv->sv_tv == &di->di_tv)
+ {
+ if (check_writable && sv->sv_const)
+ semsg(_(e_readonlyvar), name);
+ return idx;
+ }
+ }
+ return -1;
+}
+
+/*
+ * Find "name" in imported items of the current script/
+ */
+ imported_T *
+find_imported(char_u *name, cctx_T *cctx)
+{
+ scriptitem_T *si = &SCRIPT_ITEM(current_sctx.sc_sid);
+ int idx;
+
+ if (cctx != NULL)
+ for (idx = 0; idx < cctx->ctx_imports.ga_len; ++idx)
+ {
+ imported_T *import = ((imported_T *)cctx->ctx_imports.ga_data)
+ + idx;
+
+ if (STRCMP(name, import->imp_name) == 0)
+ return import;
+ }
+
+ for (idx = 0; idx < si->sn_imports.ga_len; ++idx)
+ {
+ imported_T *import = ((imported_T *)si->sn_imports.ga_data) + idx;
+
+ if (STRCMP(name, import->imp_name) == 0)
+ return import;
+ }
+ return NULL;
+}
+
+/*
+ * Generate an instruction to load script-local variable "name".
+ */
+ static int
+compile_load_scriptvar(cctx_T *cctx, char_u *name)
+{
+ scriptitem_T *si = &SCRIPT_ITEM(current_sctx.sc_sid);
+ int idx = get_script_item_idx(current_sctx.sc_sid, name, FALSE);
+ imported_T *import;
+
+ if (idx == -1)
+ {
+ // variable exists but is not in sn_var_vals: old style script.
+ return generate_LOADS(cctx, name, current_sctx.sc_sid);
+ }
+ if (idx >= 0)
+ {
+ svar_T *sv = ((svar_T *)si->sn_var_vals.ga_data) + idx;
+
+ generate_SCRIPT(cctx, ISN_LOADSCRIPT,
+ current_sctx.sc_sid, idx, sv->sv_type);
+ return OK;
+ }
+
+ import = find_imported(name, cctx);
+ if (import != NULL)
+ {
+ // TODO: check this is a variable, not a function
+ generate_SCRIPT(cctx, ISN_LOADSCRIPT,
+ import->imp_sid,
+ import->imp_var_vals_idx,
+ import->imp_type);
+ return OK;
+ }
+
+ semsg(_("E1050: Item not found: %s"), name);
+ return FAIL;
+}
+
+/*
+ * Compile a variable name into a load instruction.
+ * "end" points to just after the name.
+ * When "error" is FALSE do not give an error when not found.
+ */
+ static int
+compile_load(char_u **arg, char_u *end, cctx_T *cctx, int error)
+{
+ type_T *type;
+ char_u *name;
+ int res = FAIL;
+
+ if (*(*arg + 1) == ':')
+ {
+ // load namespaced variable
+ name = vim_strnsave(*arg + 2, end - (*arg + 2));
+ if (name == NULL)
+ return FAIL;
+
+ if (**arg == 'v')
+ {
+ // load v:var
+ int vidx = find_vim_var(name);
+
+ if (vidx < 0)
+ {
+ if (error)
+ semsg(_(e_var_notfound), name);
+ goto theend;
+ }
+
+ // TODO: get actual type
+ res = generate_LOAD(cctx, ISN_LOADV, vidx, NULL, &t_any);
+ }
+ else if (**arg == 'g')
+ {
+ // Global variables can be defined later, thus we don't check if it
+ // exists, give error at runtime.
+ res = generate_LOAD(cctx, ISN_LOADG, 0, name, &t_any);
+ }
+ else if (**arg == 's')
+ {
+ res = compile_load_scriptvar(cctx, name);
+ }
+ else
+ {
+ semsg("Namespace not supported yet: %s", **arg);
+ goto theend;
+ }
+ }
+ else
+ {
+ size_t len = end - *arg;
+ int idx;
+ int gen_load = FALSE;
+
+ name = vim_strnsave(*arg, end - *arg);
+ if (name == NULL)
+ return FAIL;
+
+ idx = lookup_arg(*arg, len, cctx);
+ if (idx >= 0)
+ {
+ if (cctx->ctx_ufunc->uf_arg_types != NULL)
+ type = cctx->ctx_ufunc->uf_arg_types[idx];
+ else
+ type = &t_any;
+
+ // Arguments are located above the frame pointer.
+ idx -= cctx->ctx_ufunc->uf_args.ga_len + STACK_FRAME_SIZE;
+ if (cctx->ctx_ufunc->uf_va_name != NULL)
+ --idx;
+ gen_load = TRUE;
+ }
+ else if (lookup_vararg(*arg, len, cctx))
+ {
+ // varargs is always the last argument
+ idx = -STACK_FRAME_SIZE - 1;
+ type = cctx->ctx_ufunc->uf_va_type;
+ gen_load = TRUE;
+ }
+ else
+ {
+ idx = lookup_local(*arg, len, cctx);
+ if (idx >= 0)
+ {
+ type = (((lvar_T *)cctx->ctx_locals.ga_data) + idx)->lv_type;
+ gen_load = TRUE;
+ }
+ else
+ {
+ if ((len == 4 && STRNCMP("true", *arg, 4) == 0)
+ || (len == 5 && STRNCMP("false", *arg, 5) == 0))
+ res = generate_PUSHBOOL(cctx, **arg == 't'
+ ? VVAL_TRUE : VVAL_FALSE);
+ else
+ res = compile_load_scriptvar(cctx, name);
+ }
+ }
+ if (gen_load)
+ res = generate_LOAD(cctx, ISN_LOAD, idx, NULL, type);
+ }
+
+ *arg = end;
+
+theend:
+ if (res == FAIL && error)
+ semsg(_(e_var_notfound), name);
+ vim_free(name);
+ return res;
+}
+
+/*
+ * Compile the argument expressions.
+ * "arg" points to just after the "(" and is advanced to after the ")"
+ */
+ static int
+compile_arguments(char_u **arg, cctx_T *cctx, int *argcount)
+{
+ char_u *p = *arg;
+
+ while (*p != NUL && *p != ')')
+ {
+ if (compile_expr1(&p, cctx) == FAIL)
+ return FAIL;
+ ++*argcount;
+ if (*p == ',')
+ p = skipwhite(p + 1);
+ }
+ if (*p != ')')
+ {
+ emsg(_(e_missing_close));
+ return FAIL;
+ }
+ *arg = p + 1;
+ return OK;
+}
+
+/*
+ * Compile a function call: name(arg1, arg2)
+ * "arg" points to "name", "arg + varlen" to the "(".
+ * "argcount_init" is 1 for "value->method()"
+ * Instructions:
+ * EVAL arg1
+ * EVAL arg2
+ * BCALL / DCALL / UCALL
+ */
+ static int
+compile_call(char_u **arg, size_t varlen, cctx_T *cctx, int argcount_init)
+{
+ char_u *name = *arg;
+ char_u *p = *arg + varlen + 1;
+ int argcount = argcount_init;
+ char_u namebuf[100];
+ ufunc_T *ufunc;
+
+ if (varlen >= sizeof(namebuf))
+ {
+ semsg(_("E1011: name too long: %s"), name);
+ return FAIL;
+ }
+ vim_strncpy(namebuf, name, varlen);
+
+ *arg = skipwhite(*arg + varlen + 1);
+ if (compile_arguments(arg, cctx, &argcount) == FAIL)
+ return FAIL;
+
+ if (ASCII_ISLOWER(*name))
+ {
+ int idx;
+
+ // builtin function
+ idx = find_internal_func(namebuf);
+ if (idx >= 0)
+ return generate_BCALL(cctx, idx, argcount);
+ semsg(_(e_unknownfunc), namebuf);
+ }
+
+ // User defined function or variable must start with upper case.
+ if (!ASCII_ISUPPER(*name))
+ {
+ semsg(_("E1012: Invalid function name: %s"), namebuf);
+ return FAIL;
+ }
+
+ // If we can find the function by name generate the right call.
+ ufunc = find_func(namebuf, cctx);
+ if (ufunc != NULL)
+ return generate_CALL(cctx, ufunc, argcount);
+
+ // If the name is a variable, load it and use PCALL.
+ p = namebuf;
+ if (compile_load(&p, namebuf + varlen, cctx, FALSE) == OK)
+ return generate_PCALL(cctx, argcount, FALSE);
+
+ // The function may be defined only later. Need to figure out at runtime.
+ return generate_UCALL(cctx, namebuf, argcount);
+}
+
+// like NAMESPACE_CHAR but with 'a' and 'l'.
+#define VIM9_NAMESPACE_CHAR (char_u *)"bgstvw"
+
+/*
+ * Find the end of a variable or function name. Unlike find_name_end() this
+ * does not recognize magic braces.
+ * Return a pointer to just after the name. Equal to "arg" if there is no
+ * valid name.
+ */
+ char_u *
+to_name_end(char_u *arg)
+{
+ char_u *p;
+
+ // Quick check for valid starting character.
+ if (!eval_isnamec1(*arg))
+ return arg;
+
+ for (p = arg + 1; *p != NUL && eval_isnamec(*p); MB_PTR_ADV(p))
+ // Include a namespace such as "s:var" and "v:var". But "n:" is not
+ // and can be used in slice "[n:]".
+ if (*p == ':' && (p != arg + 1
+ || vim_strchr(VIM9_NAMESPACE_CHAR, *arg) == NULL))
+ break;
+ return p;
+}
+
+/*
+ * Like to_name_end() but also skip over a list or dict constant.
+ */
+ char_u *
+to_name_const_end(char_u *arg)
+{
+ char_u *p = to_name_end(arg);
+ typval_T rettv;
+
+ if (p == arg && *arg == '[')
+ {
+
+ // Can be "[1, 2, 3]->Func()".
+ if (get_list_tv(&p, &rettv, FALSE, FALSE) == FAIL)
+ p = arg;
+ }
+ else if (p == arg && *arg == '#' && arg[1] == '{')
+ {
+ ++p;
+ if (eval_dict(&p, &rettv, FALSE, TRUE) == FAIL)
+ p = arg;
+ }
+ else if (p == arg && *arg == '{')
+ {
+ int ret = get_lambda_tv(&p, &rettv, FALSE);
+
+ if (ret == NOTDONE)
+ ret = eval_dict(&p, &rettv, FALSE, FALSE);
+ if (ret != OK)
+ p = arg;
+ }
+
+ return p;
+}
+
+ static void
+type_mismatch(type_T *expected, type_T *actual)
+{
+ char *tofree1, *tofree2;
+
+ semsg(_("E1013: type mismatch, expected %s but got %s"),
+ type_name(expected, &tofree1), type_name(actual, &tofree2));
+ vim_free(tofree1);
+ vim_free(tofree2);
+}
+
+/*
+ * Check if the expected and actual types match.
+ */
+ static int
+check_type(type_T *expected, type_T *actual, int give_msg)
+{
+ if (expected->tt_type != VAR_UNKNOWN)
+ {
+ if (expected->tt_type != actual->tt_type)
+ {
+ if (give_msg)
+ type_mismatch(expected, actual);
+ return FAIL;
+ }
+ if (expected->tt_type == VAR_DICT || expected->tt_type == VAR_LIST)
+ {
+ int ret = check_type(expected->tt_member, actual->tt_member,
+ FALSE);
+ if (ret == FAIL && give_msg)
+ type_mismatch(expected, actual);
+ return ret;
+ }
+ }
+ return OK;
+}
+
+/*
+ * Check that
+ * - "actual" is "expected" type or
+ * - "actual" is a type that can be "expected" type: add a runtime check; or
+ * - return FAIL.
+ */
+ static int
+need_type(type_T *actual, type_T *expected, int offset, cctx_T *cctx)
+{
+ if (equal_type(actual, expected) || expected->tt_type == VAR_UNKNOWN)
+ return OK;
+ if (actual->tt_type != VAR_UNKNOWN)
+ {
+ type_mismatch(expected, actual);
+ return FAIL;
+ }
+ generate_TYPECHECK(cctx, expected, offset);
+ return OK;
+}
+
+/*
+ * parse a list: [expr, expr]
+ * "*arg" points to the '['.
+ */
+ static int
+compile_list(char_u **arg, cctx_T *cctx)
+{
+ char_u *p = skipwhite(*arg + 1);
+ int count = 0;
+
+ while (*p != ']')
+ {
+ if (*p == NUL)
+ return FAIL;
+ if (compile_expr1(&p, cctx) == FAIL)
+ break;
+ ++count;
+ if (*p == ',')
+ ++p;
+ p = skipwhite(p);
+ }
+ *arg = p + 1;
+
+ generate_NEWLIST(cctx, count);
+ return OK;
+}
+
+/*
+ * parse a lambda: {arg, arg -> expr}
+ * "*arg" points to the '{'.
+ */
+ static int
+compile_lambda(char_u **arg, cctx_T *cctx)
+{
+ garray_T *instr = &cctx->ctx_instr;
+ typval_T rettv;
+ ufunc_T *ufunc;
+
+ // Get the funcref in "rettv".
+ if (get_lambda_tv(arg, &rettv, TRUE) == FAIL)
+ return FAIL;
+ ufunc = rettv.vval.v_partial->pt_func;
+
+ // The function will have one line: "return {expr}".
+ // Compile it into instructions.
+ compile_def_function(ufunc, TRUE);
+
+ if (ufunc->uf_dfunc_idx >= 0)
+ {
+ if (ga_grow(instr, 1) == FAIL)
+ return FAIL;
+ generate_FUNCREF(cctx, ufunc->uf_dfunc_idx);
+ return OK;
+ }
+ return FAIL;
+}
+
+/*
+ * Compile a lamda call: expr->{lambda}(args)
+ * "arg" points to the "{".
+ */
+ static int
+compile_lambda_call(char_u **arg, cctx_T *cctx)
+{
+ ufunc_T *ufunc;
+ typval_T rettv;
+ int argcount = 1;
+ int ret = FAIL;
+
+ // Get the funcref in "rettv".
+ if (get_lambda_tv(arg, &rettv, TRUE) == FAIL)
+ return FAIL;
+
+ if (**arg != '(')
+ {
+ if (*skipwhite(*arg) == '(')
+ semsg(_(e_nowhitespace));
+ else
+ semsg(_(e_missing_paren), "lambda");
+ clear_tv(&rettv);
+ return FAIL;
+ }
+
+ // The function will have one line: "return {expr}".
+ // Compile it into instructions.
+ ufunc = rettv.vval.v_partial->pt_func;
+ ++ufunc->uf_refcount;
+ compile_def_function(ufunc, TRUE);
+
+ // compile the arguments
+ *arg = skipwhite(*arg + 1);
+ if (compile_arguments(arg, cctx, &argcount) == OK)
+ // call the compiled function
+ ret = generate_CALL(cctx, ufunc, argcount);
+
+ clear_tv(&rettv);
+ return ret;
+}
+
+/*
+ * parse a dict: {'key': val} or #{key: val}
+ * "*arg" points to the '{'.
+ */
+ static int
+compile_dict(char_u **arg, cctx_T *cctx, int literal)
+{
+ garray_T *instr = &cctx->ctx_instr;
+ int count = 0;
+ dict_T *d = dict_alloc();
+ dictitem_T *item;
+
+ if (d == NULL)
+ return FAIL;
+ *arg = skipwhite(*arg + 1);
+ while (**arg != '}' && **arg != NUL)
+ {
+ char_u *key = NULL;
+
+ if (literal)
+ {
+ char_u *p = to_name_end(*arg);
+
+ if (p == *arg)
+ {
+ semsg(_("E1014: Invalid key: %s"), *arg);
+ return FAIL;
+ }
+ key = vim_strnsave(*arg, p - *arg);
+ if (generate_PUSHS(cctx, key) == FAIL)
+ return FAIL;
+ *arg = p;
+ }
+ else
+ {
+ isn_T *isn;
+
+ if (compile_expr1(arg, cctx) == FAIL)
+ return FAIL;
+ // TODO: check type is string
+ isn = ((isn_T *)instr->ga_data) + instr->ga_len - 1;
+ if (isn->isn_type == ISN_PUSHS)
+ key = isn->isn_arg.string;
+ }
+
+ // Check for duplicate keys, if using string keys.
+ if (key != NULL)
+ {
+ item = dict_find(d, key, -1);
+ if (item != NULL)
+ {
+ semsg(_(e_duplicate_key), key);
+ goto failret;
+ }
+ item = dictitem_alloc(key);
+ if (item != NULL)
+ {
+ item->di_tv.v_type = VAR_UNKNOWN;
+ item->di_tv.v_lock = 0;
+ if (dict_add(d, item) == FAIL)
+ dictitem_free(item);
+ }
+ }
+
+ *arg = skipwhite(*arg);
+ if (**arg != ':')
+ {
+ semsg(_(e_missing_dict_colon), *arg);
+ return FAIL;
+ }
+
+ *arg = skipwhite(*arg + 1);
+ if (compile_expr1(arg, cctx) == FAIL)
+ return FAIL;
+ ++count;
+
+ if (**arg == '}')
+ break;
+ if (**arg != ',')
+ {
+ semsg(_(e_missing_dict_comma), *arg);
+ goto failret;
+ }
+ *arg = skipwhite(*arg + 1);
+ }
+
+ if (**arg != '}')
+ {
+ semsg(_(e_missing_dict_end), *arg);
+ goto failret;
+ }
+ *arg = *arg + 1;
+
+ dict_unref(d);
+ return generate_NEWDICT(cctx, count);
+
+failret:
+ dict_unref(d);
+ return FAIL;
+}
+
+/*
+ * Compile "&option".
+ */
+ static int
+compile_get_option(char_u **arg, cctx_T *cctx)
+{
+ typval_T rettv;
+ char_u *start = *arg;
+ int ret;
+
+ // parse the option and get the current value to get the type.
+ rettv.v_type = VAR_UNKNOWN;
+ ret = get_option_tv(arg, &rettv, TRUE);
+ if (ret == OK)
+ {
+ // include the '&' in the name, get_option_tv() expects it.
+ char_u *name = vim_strnsave(start, *arg - start);
+ type_T *type = rettv.v_type == VAR_NUMBER ? &t_number : &t_string;
+
+ ret = generate_LOAD(cctx, ISN_LOADOPT, 0, name, type);
+ vim_free(name);
+ }
+ clear_tv(&rettv);
+
+ return ret;
+}
+
+/*
+ * Compile "$VAR".
+ */
+ static int
+compile_get_env(char_u **arg, cctx_T *cctx)
+{
+ char_u *start = *arg;
+ int len;
+ int ret;
+ char_u *name;
+
+ start = *arg;
+ ++*arg;
+ len = get_env_len(arg);
+ if (len == 0)
+ {
+ semsg(_(e_syntax_at), start - 1);
+ return FAIL;
+ }
+
+ // include the '$' in the name, get_env_tv() expects it.
+ name = vim_strnsave(start, len + 1);
+ ret = generate_LOAD(cctx, ISN_LOADENV, 0, name, &t_string);
+ vim_free(name);
+ return ret;
+}
+
+/*
+ * Compile "@r".
+ */
+ static int
+compile_get_register(char_u **arg, cctx_T *cctx)
+{
+ int ret;
+
+ ++*arg;
+ if (**arg == NUL)
+ {
+ semsg(_(e_syntax_at), *arg - 1);
+ return FAIL;
+ }
+ if (!valid_yank_reg(**arg, TRUE))
+ {
+ emsg_invreg(**arg);
+ return FAIL;
+ }
+ ret = generate_LOAD(cctx, ISN_LOADREG, **arg, NULL, &t_string);
+ ++*arg;
+ return ret;
+}
+
+/*
+ * Apply leading '!', '-' and '+' to constant "rettv".
+ */
+ static int
+apply_leader(typval_T *rettv, char_u *start, char_u *end)
+{
+ char_u *p = end;
+
+ // this works from end to start
+ while (p > start)
+ {
+ --p;
+ if (*p == '-' || *p == '+')
+ {
+ // only '-' has an effect, for '+' we only check the type
+#ifdef FEAT_FLOAT
+ if (rettv->v_type == VAR_FLOAT)
+ {
+ if (*p == '-')
+ rettv->vval.v_float = -rettv->vval.v_float;
+ }
+ else
+#endif
+ {
+ varnumber_T val;
+ int error = FALSE;
+
+ // tv_get_number_chk() accepts a string, but we don't want that
+ // here
+ if (check_not_string(rettv) == FAIL)
+ return FAIL;
+ val = tv_get_number_chk(rettv, &error);
+ clear_tv(rettv);
+ if (error)
+ return FAIL;
+ if (*p == '-')
+ val = -val;
+ rettv->v_type = VAR_NUMBER;
+ rettv->vval.v_number = val;
+ }
+ }
+ else
+ {
+ int v = tv2bool(rettv);
+
+ // '!' is permissive in the type.
+ clear_tv(rettv);
+ rettv->v_type = VAR_BOOL;
+ rettv->vval.v_number = v ? VVAL_FALSE : VVAL_TRUE;
+ }
+ }
+ return OK;
+}
+
+/*
+ * Recognize v: variables that are constants and set "rettv".
+ */
+ static void
+get_vim_constant(char_u **arg, typval_T *rettv)
+{
+ if (STRNCMP(*arg, "v:true", 6) == 0)
+ {
+ rettv->v_type = VAR_BOOL;
+ rettv->vval.v_number = VVAL_TRUE;
+ *arg += 6;
+ }
+ else if (STRNCMP(*arg, "v:false", 7) == 0)
+ {
+ rettv->v_type = VAR_BOOL;
+ rettv->vval.v_number = VVAL_FALSE;
+ *arg += 7;
+ }
+ else if (STRNCMP(*arg, "v:null", 6) == 0)
+ {
+ rettv->v_type = VAR_SPECIAL;
+ rettv->vval.v_number = VVAL_NULL;
+ *arg += 6;
+ }
+ else if (STRNCMP(*arg, "v:none", 6) == 0)
+ {
+ rettv->v_type = VAR_SPECIAL;
+ rettv->vval.v_number = VVAL_NONE;
+ *arg += 6;
+ }
+}
+
+/*
+ * Compile code to apply '-', '+' and '!'.
+ */
+ static int
+compile_leader(cctx_T *cctx, char_u *start, char_u *end)
+{
+ char_u *p = end;
+
+ // this works from end to start
+ while (p > start)
+ {
+ --p;
+ if (*p == '-' || *p == '+')
+ {
+ int negate = *p == '-';
+ isn_T *isn;
+
+ // TODO: check type
+ while (p > start && (p[-1] == '-' || p[-1] == '+'))
+ {
+ --p;
+ if (*p == '-')
+ negate = !negate;
+ }
+ // only '-' has an effect, for '+' we only check the type
+ if (negate)
+ isn = generate_instr(cctx, ISN_NEGATENR);
+ else
+ isn = generate_instr(cctx, ISN_CHECKNR);
+ if (isn == NULL)
+ return FAIL;
+ }
+ else
+ {
+ int invert = TRUE;
+
+ while (p > start && p[-1] == '!')
+ {
+ --p;
+ invert = !invert;
+ }
+ if (generate_2BOOL(cctx, invert) == FAIL)
+ return FAIL;
+ }
+ }
+ return OK;
+}
+
+/*
+ * Compile whatever comes after "name" or "name()".
+ */
+ static int
+compile_subscript(
+ char_u **arg,
+ cctx_T *cctx,
+ char_u **start_leader,
+ char_u *end_leader)
+{
+ for (;;)
+ {
+ if (**arg == '(')
+ {
+ int argcount = 0;
+
+ // funcref(arg)
+ *arg = skipwhite(*arg + 1);
+ if (compile_arguments(arg, cctx, &argcount) == FAIL)
+ return FAIL;
+ if (generate_PCALL(cctx, argcount, TRUE) == FAIL)
+ return FAIL;
+ }
+ else if (**arg == '-' && (*arg)[1] == '>')
+ {
+ char_u *p;
+
+ // something->method()
+ // Apply the '!', '-' and '+' first:
+ // -1.0->func() works like (-1.0)->func()
+ if (compile_leader(cctx, *start_leader, end_leader) == FAIL)
+ return FAIL;
+ *start_leader = end_leader; // don't apply again later
+
+ *arg = skipwhite(*arg + 2);
+ if (**arg == '{')
+ {
+ // lambda call: list->{lambda}
+ if (compile_lambda_call(arg, cctx) == FAIL)
+ return FAIL;
+ }
+ else
+ {
+ // method call: list->method()
+ for (p = *arg; eval_isnamec1(*p); ++p)
+ ;
+ if (*p != '(')
+ {
+ semsg(_(e_missing_paren), arg);
+ return FAIL;
+ }
+ // TODO: base value may not be the first argument
+ if (compile_call(arg, p - *arg, cctx, 1) == FAIL)
+ return FAIL;
+ }
+ }
+ else if (**arg == '[')
+ {
+ // list index: list[123]
+ // TODO: more arguments
+ // TODO: dict member dict['name']
+ *arg = skipwhite(*arg + 1);
+ if (compile_expr1(arg, cctx) == FAIL)
+ return FAIL;
+
+ if (**arg != ']')
+ {
+ emsg(_(e_missbrac));
+ return FAIL;
+ }
+ *arg = skipwhite(*arg + 1);
+
+ if (generate_instr_drop(cctx, ISN_INDEX, 1) == FAIL)
+ return FAIL;
+ }
+ else if (**arg == '.' && (*arg)[1] != '.')
+ {
+ char_u *p;
+
+ ++*arg;
+ p = *arg;
+ // dictionary member: dict.name
+ if (eval_isnamec1(*p))
+ while (eval_isnamec(*p))
+ MB_PTR_ADV(p);
+ if (p == *arg)
+ {
+ semsg(_(e_syntax_at), *arg);
+ return FAIL;
+ }
+ // TODO: check type is dict
+ if (generate_MEMBER(cctx, *arg, p - *arg) == FAIL)
+ return FAIL;
+ *arg = p;
+ }
+ else
+ break;
+ }
+
+ // TODO - see handle_subscript():
+ // Turn "dict.Func" into a partial for "Func" bound to "dict".
+ // Don't do this when "Func" is already a partial that was bound
+ // explicitly (pt_auto is FALSE).
+
+ return OK;
+}
+
+/*
+ * Compile an expression at "*p" and add instructions to "instr".
+ * "p" is advanced until after the expression, skipping white space.
+ *
+ * This is the equivalent of eval1(), eval2(), etc.
+ */
+
+/*
+ * number number constant
+ * 0zFFFFFFFF Blob constant
+ * "string" string constant
+ * 'string' literal string constant
+ * &option-name option value
+ * @r register contents
+ * identifier variable value
+ * function() function call
+ * $VAR environment variable
+ * (expression) nested expression
+ * [expr, expr] List
+ * {key: val, key: val} Dictionary
+ * #{key: val, key: val} Dictionary with literal keys
+ *
+ * Also handle:
+ * ! in front logical NOT
+ * - in front unary minus
+ * + in front unary plus (ignored)
+ * trailing (arg) funcref/partial call
+ * trailing [] subscript in String or List
+ * trailing .name entry in Dictionary
+ * trailing ->name() method call
+ */
+ static int
+compile_expr7(char_u **arg, cctx_T *cctx)
+{
+ typval_T rettv;
+ char_u *start_leader, *end_leader;
+ int ret = OK;
+
+ /*
+ * Skip '!', '-' and '+' characters. They are handled later.
+ */
+ start_leader = *arg;
+ while (**arg == '!' || **arg == '-' || **arg == '+')
+ *arg = skipwhite(*arg + 1);
+ end_leader = *arg;
+
+ rettv.v_type = VAR_UNKNOWN;
+ switch (**arg)
+ {
+ /*
+ * Number constant.
+ */
+ case '0': // also for blob starting with 0z
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ case '8':
+ case '9':
+ case '.': if (get_number_tv(arg, &rettv, TRUE, FALSE) == FAIL)
+ return FAIL;
+ break;
+
+ /*
+ * String constant: "string".
+ */
+ case '"': if (get_string_tv(arg, &rettv, TRUE) == FAIL)
+ return FAIL;
+ break;
+
+ /*
+ * Literal string constant: 'str''ing'.
+ */
+ case '\'': if (get_lit_string_tv(arg, &rettv, TRUE) == FAIL)
+ return FAIL;
+ break;
+
+ /*
+ * Constant Vim variable.
+ */
+ case 'v': get_vim_constant(arg, &rettv);
+ ret = NOTDONE;
+ break;
+
+ /*
+ * List: [expr, expr]
+ */
+ case '[': ret = compile_list(arg, cctx);
+ break;
+
+ /*
+ * Dictionary: #{key: val, key: val}
+ */
+ case '#': if ((*arg)[1] == '{')
+ {
+ ++*arg;
+ ret = compile_dict(arg, cctx, TRUE);
+ }
+ else
+ ret = NOTDONE;
+ break;
+
+ /*
+ * Lambda: {arg, arg -> expr}
+ * Dictionary: {'key': val, 'key': val}
+ */
+ case '{': {
+ char_u *start = skipwhite(*arg + 1);
+
+ // Find out what comes after the arguments.
+ ret = get_function_args(&start, '-', NULL,
+ NULL, NULL, NULL, TRUE);
+ if (ret != FAIL && *start == '>')
+ ret = compile_lambda(arg, cctx);
+ else
+ ret = compile_dict(arg, cctx, FALSE);
+ }
+ break;
+
+ /*
+ * Option value: &name
+ */
+ case '&': ret = compile_get_option(arg, cctx);
+ break;
+
+ /*
+ * Environment variable: $VAR.
+ */
+ case '$': ret = compile_get_env(arg, cctx);
+ break;
+
+ /*
+ * Register contents: @r.
+ */
+ case '@': ret = compile_get_register(arg, cctx);
+ break;
+ /*
+ * nested expression: (expression).
+ */
+ case '(': *arg = skipwhite(*arg + 1);
+ ret = compile_expr1(arg, cctx); // recursive!
+ *arg = skipwhite(*arg);
+ if (**arg == ')')
+ ++*arg;
+ else if (ret == OK)
+ {
+ emsg(_(e_missing_close));
+ ret = FAIL;
+ }
+ break;
+
+ default: ret = NOTDONE;
+ break;
+ }
+ if (ret == FAIL)
+ return FAIL;
+
+ if (rettv.v_type != VAR_UNKNOWN)
+ {
+ // apply the '!', '-' and '+' before the constant
+ if (apply_leader(&rettv, start_leader, end_leader) == FAIL)
+ {
+ clear_tv(&rettv);
+ return FAIL;
+ }
+ start_leader = end_leader; // don't apply again below
+
+ // push constant
+ switch (rettv.v_type)
+ {
+ case VAR_BOOL:
+ generate_PUSHBOOL(cctx, rettv.vval.v_number);
+ break;
+ case VAR_SPECIAL:
+ generate_PUSHSPEC(cctx, rettv.vval.v_number);
+ break;
+ case VAR_NUMBER:
+ generate_PUSHNR(cctx, rettv.vval.v_number);
+ break;
+#ifdef FEAT_FLOAT
+ case VAR_FLOAT:
+ generate_PUSHF(cctx, rettv.vval.v_float);
+ break;
+#endif
+ case VAR_BLOB:
+ generate_PUSHBLOB(cctx, rettv.vval.v_blob);
+ rettv.vval.v_blob = NULL;
+ break;
+ case VAR_STRING:
+ generate_PUSHS(cctx, rettv.vval.v_string);
+ rettv.vval.v_string = NULL;
+ break;
+ default:
+ iemsg("constant type missing");
+ return FAIL;
+ }
+ }
+ else if (ret == NOTDONE)
+ {
+ char_u *p;
+ int r;
+
+ if (!eval_isnamec1(**arg))
+ {
+ semsg(_("E1015: Name expected: %s"), *arg);
+ return FAIL;
+ }
+
+ // "name" or "name()"
+ p = to_name_end(*arg);
+ if (*p == '(')
+ r = compile_call(arg, p - *arg, cctx, 0);
+ else
+ r = compile_load(arg, p, cctx, TRUE);
+ if (r == FAIL)
+ return FAIL;
+ }
+
+ if (compile_subscript(arg, cctx, &start_leader, end_leader) == FAIL)
+ return FAIL;
+
+ // Now deal with prefixed '-', '+' and '!', if not done already.
+ return compile_leader(cctx, start_leader, end_leader);
+}
+
+/*
+ * * number multiplication
+ * / number division
+ * % number modulo
+ */
+ static int
+compile_expr6(char_u **arg, cctx_T *cctx)
+{
+ char_u *op;
+
+ // get the first variable
+ if (compile_expr7(arg, cctx) == FAIL)
+ return FAIL;
+
+ /*
+ * Repeat computing, until no "*", "/" or "%" is following.
+ */
+ for (;;)
+ {
+ op = skipwhite(*arg);
+ if (*op != '*' && *op != '/' && *op != '%')
+ break;
+ if (!VIM_ISWHITE(**arg) || !VIM_ISWHITE(op[1]))
+ {
+ char_u buf[3];
+
+ vim_strncpy(buf, op, 1);
+ semsg(_(e_white_both), buf);
+ }
+ *arg = skipwhite(op + 1);
+
+ // get the second variable
+ if (compile_expr7(arg, cctx) == FAIL)
+ return FAIL;
+
+ generate_two_op(cctx, op);
+ }
+
+ return OK;
+}
+
+/*
+ * + number addition
+ * - number subtraction
+ * .. string concatenation
+ */
+ static int
+compile_expr5(char_u **arg, cctx_T *cctx)
+{
+ char_u *op;
+ int oplen;
+
+ // get the first variable
+ if (compile_expr6(arg, cctx) == FAIL)
+ return FAIL;
+
+ /*
+ * Repeat computing, until no "+", "-" or ".." is following.
+ */
+ for (;;)
+ {
+ op = skipwhite(*arg);
+ if (*op != '+' && *op != '-' && !(*op == '.' && (*(*arg + 1) == '.')))
+ break;
+ oplen = (*op == '.' ? 2 : 1);
+
+ if (!VIM_ISWHITE(**arg) || !VIM_ISWHITE(op[oplen]))
+ {
+ char_u buf[3];
+
+ vim_strncpy(buf, op, oplen);
+ semsg(_(e_white_both), buf);
+ }
+
+ *arg = skipwhite(op + oplen);
+
+ // get the second variable
+ if (compile_expr6(arg, cctx) == FAIL)
+ return FAIL;
+
+ if (*op == '.')
+ {
+ if (may_generate_2STRING(-2, cctx) == FAIL
+ || may_generate_2STRING(-1, cctx) == FAIL)
+ return FAIL;
+ generate_instr_drop(cctx, ISN_CONCAT, 1);
+ }
+ else
+ generate_two_op(cctx, op);
+ }
+
+ return OK;
+}
+
+/*
+ * expr5a == expr5b
+ * expr5a =~ expr5b
+ * expr5a != expr5b
+ * expr5a !~ expr5b
+ * expr5a > expr5b
+ * expr5a >= expr5b
+ * expr5a < expr5b
+ * expr5a <= expr5b
+ * expr5a is expr5b
+ * expr5a isnot expr5b
+ *
+ * Produces instructions:
+ * EVAL expr5a Push result of "expr5a"
+ * EVAL expr5b Push result of "expr5b"
+ * COMPARE one of the compare instructions
+ */
+ static int
+compile_expr4(char_u **arg, cctx_T *cctx)
+{
+ exptype_T type = EXPR_UNKNOWN;
+ char_u *p;
+ int len = 2;
+ int i;
+ int type_is = FALSE;
+
+ // get the first variable
+ if (compile_expr5(arg, cctx) == FAIL)
+ return FAIL;
+
+ p = skipwhite(*arg);
+ switch (p[0])
+ {
+ case '=': if (p[1] == '=')
+ type = EXPR_EQUAL;
+ else if (p[1] == '~')
+ type = EXPR_MATCH;
+ break;
+ case '!': if (p[1] == '=')
+ type = EXPR_NEQUAL;
+ else if (p[1] == '~')
+ type = EXPR_NOMATCH;
+ break;
+ case '>': if (p[1] != '=')
+ {
+ type = EXPR_GREATER;
+ len = 1;
+ }
+ else
+ type = EXPR_GEQUAL;
+ break;
+ case '<': if (p[1] != '=')
+ {
+ type = EXPR_SMALLER;
+ len = 1;
+ }
+ else
+ type = EXPR_SEQUAL;
+ break;
+ case 'i': if (p[1] == 's')
+ {
+ // "is" and "isnot"; but not a prefix of a name
+ if (p[2] == 'n' && p[3] == 'o' && p[4] == 't')
+ len = 5;
+ i = p[len];
+ if (!isalnum(i) && i != '_')
+ {
+ type = len == 2 ? EXPR_IS : EXPR_ISNOT;
+ type_is = TRUE;
+ }
+ }
+ break;
+ }
+
+ /*
+ * If there is a comparative operator, use it.
+ */
+ if (type != EXPR_UNKNOWN)
+ {
+ int ic = FALSE; // Default: do not ignore case
+
+ if (type_is && (p[len] == '?' || p[len] == '#'))
+ {
+ semsg(_(e_invexpr2), *arg);
+ return FAIL;
+ }
+ // extra question mark appended: ignore case
+ if (p[len] == '?')
+ {
+ ic = TRUE;
+ ++len;
+ }
+ // extra '#' appended: match case (ignored)
+ else if (p[len] == '#')
+ ++len;
+ // nothing appended: match case
+
+ if (!VIM_ISWHITE(**arg) || !VIM_ISWHITE(p[len]))
+ {
+ char_u buf[7];
+
+ vim_strncpy(buf, p, len);
+ semsg(_(e_white_both), buf);
+ }
+
+ // get the second variable
+ *arg = skipwhite(p + len);
+ if (compile_expr5(arg, cctx) == FAIL)
+ return FAIL;
+
+ generate_COMPARE(cctx, type, ic);
+ }
+
+ return OK;
+}
+
+/*
+ * Compile || or &&.
+ */
+ static int
+compile_and_or(char_u **arg, cctx_T *cctx, char *op)
+{
+ char_u *p = skipwhite(*arg);
+ int opchar = *op;
+
+ if (p[0] == opchar && p[1] == opchar)
+ {
+ garray_T *instr = &cctx->ctx_instr;
+ garray_T end_ga;
+
+ /*
+ * Repeat until there is no following "||" or "&&"
+ */
+ ga_init2(&end_ga, sizeof(int), 10);
+ while (p[0] == opchar && p[1] == opchar)
+ {
+ if (!VIM_ISWHITE(**arg) || !VIM_ISWHITE(p[2]))
+ semsg(_(e_white_both), op);
+
+ if (ga_grow(&end_ga, 1) == FAIL)
+ {
+ ga_clear(&end_ga);
+ return FAIL;
+ }
+ *(((int *)end_ga.ga_data) + end_ga.ga_len) = instr->ga_len;
+ ++end_ga.ga_len;
+ generate_JUMP(cctx, opchar == '|'
+ ? JUMP_AND_KEEP_IF_TRUE : JUMP_AND_KEEP_IF_FALSE, 0);
+
+ // eval the next expression
+ *arg = skipwhite(p + 2);
+ if ((opchar == '|' ? compile_expr3(arg, cctx)
+ : compile_expr4(arg, cctx)) == FAIL)
+ {
+ ga_clear(&end_ga);
+ return FAIL;
+ }
+ p = skipwhite(*arg);
+ }
+
+ // Fill in the end label in all jumps.
+ while (end_ga.ga_len > 0)
+ {
+ isn_T *isn;
+
+ --end_ga.ga_len;
+ isn = ((isn_T *)instr->ga_data)
+ + *(((int *)end_ga.ga_data) + end_ga.ga_len);
+ isn->isn_arg.jump.jump_where = instr->ga_len;
+ }
+ ga_clear(&end_ga);
+ }
+
+ return OK;
+}
+
+/*
+ * expr4a && expr4a && expr4a logical AND
+ *
+ * Produces instructions:
+ * EVAL expr4a Push result of "expr4a"
+ * JUMP_AND_KEEP_IF_FALSE end
+ * EVAL expr4b Push result of "expr4b"
+ * JUMP_AND_KEEP_IF_FALSE end
+ * EVAL expr4c Push result of "expr4c"
+ * end:
+ */
+ static int
+compile_expr3(char_u **arg, cctx_T *cctx)
+{
+ // get the first variable
+ if (compile_expr4(arg, cctx) == FAIL)
+ return FAIL;
+
+ // || and && work almost the same
+ return compile_and_or(arg, cctx, "&&");
+}
+
+/*
+ * expr3a || expr3b || expr3c logical OR
+ *
+ * Produces instructions:
+ * EVAL expr3a Push result of "expr3a"
+ * JUMP_AND_KEEP_IF_TRUE end
+ * EVAL expr3b Push result of "expr3b"
+ * JUMP_AND_KEEP_IF_TRUE end
+ * EVAL expr3c Push result of "expr3c"
+ * end:
+ */
+ static int
+compile_expr2(char_u **arg, cctx_T *cctx)
+{
+ // eval the first expression
+ if (compile_expr3(arg, cctx) == FAIL)
+ return FAIL;
+
+ // || and && work almost the same
+ return compile_and_or(arg, cctx, "||");
+}
+
+/*
+ * Toplevel expression: expr2 ? expr1a : expr1b
+ *
+ * Produces instructions:
+ * EVAL expr2 Push result of "expr"
+ * JUMP_IF_FALSE alt jump if false
+ * EVAL expr1a
+ * JUMP_ALWAYS end
+ * alt: EVAL expr1b
+ * end:
+ */
+ static int
+compile_expr1(char_u **arg, cctx_T *cctx)
+{
+ char_u *p;
+
+ // evaluate the first expression
+ if (compile_expr2(arg, cctx) == FAIL)
+ return FAIL;
+
+ p = skipwhite(*arg);
+ if (*p == '?')
+ {
+ garray_T *instr = &cctx->ctx_instr;
+ garray_T *stack = &cctx->ctx_type_stack;
+ int alt_idx = instr->ga_len;
+ int end_idx;
+ isn_T *isn;
+ type_T *type1;
+ type_T *type2;
+
+ if (!VIM_ISWHITE(**arg) || !VIM_ISWHITE(p[1]))
+ semsg(_(e_white_both), "?");
+
+ generate_JUMP(cctx, JUMP_IF_FALSE, 0);
+
+ // evaluate the second expression; any type is accepted
+ *arg = skipwhite(p + 1);
+ compile_expr1(arg, cctx);
+
+ // remember the type and drop it
+ --stack->ga_len;
+ type1 = ((type_T **)stack->ga_data)[stack->ga_len];
+
+ end_idx = instr->ga_len;
+ generate_JUMP(cctx, JUMP_ALWAYS, 0);
+
+ // jump here from JUMP_IF_FALSE
+ isn = ((isn_T *)instr->ga_data) + alt_idx;
+ isn->isn_arg.jump.jump_where = instr->ga_len;
+
+ // Check for the ":".
+ p = skipwhite(*arg);
+ if (*p != ':')
+ {
+ emsg(_(e_missing_colon));
+ return FAIL;
+ }
+ if (!VIM_ISWHITE(**arg) || !VIM_ISWHITE(p[1]))
+ semsg(_(e_white_both), ":");
+
+ // evaluate the third expression
+ *arg = skipwhite(p + 1);
+ compile_expr1(arg, cctx);
+
+ // If the types differ, the result has a more generic type.
+ type2 = ((type_T **)stack->ga_data)[stack->ga_len - 1];
+ common_type(type1, type2, type2);
+
+ // jump here from JUMP_ALWAYS
+ isn = ((isn_T *)instr->ga_data) + end_idx;
+ isn->isn_arg.jump.jump_where = instr->ga_len;
+ }
+ return OK;
+}
+
+/*
+ * compile "return [expr]"
+ */
+ static char_u *
+compile_return(char_u *arg, int set_return_type, cctx_T *cctx)
+{
+ char_u *p = arg;
+ garray_T *stack = &cctx->ctx_type_stack;
+ type_T *stack_type;
+
+ if (*p != NUL && *p != '|' && *p != '\n')
+ {
+ // compile return argument into instructions
+ if (compile_expr1(&p, cctx) == FAIL)
+ return NULL;
+
+ stack_type = ((type_T **)stack->ga_data)[stack->ga_len - 1];
+ if (set_return_type)
+ cctx->ctx_ufunc->uf_ret_type = stack_type;
+ else if (need_type(stack_type, cctx->ctx_ufunc->uf_ret_type, -1, cctx)
+ == FAIL)
+ return NULL;
+ }
+ else
+ {
+ if (set_return_type)
+ cctx->ctx_ufunc->uf_ret_type = &t_void;
+ else if (cctx->ctx_ufunc->uf_ret_type->tt_type != VAR_VOID)
+ {
+ emsg(_("E1003: Missing return value"));
+ return NULL;
+ }
+
+ // No argument, return zero.
+ generate_PUSHNR(cctx, 0);
+ }
+
+ if (generate_instr(cctx, ISN_RETURN) == NULL)
+ return NULL;
+
+ // "return val | endif" is possible
+ return skipwhite(p);
+}
+
+/*
+ * Return the length of an assignment operator, or zero if there isn't one.
+ */
+ int
+assignment_len(char_u *p, int *heredoc)
+{
+ if (*p == '=')
+ {
+ if (p[1] == '<' && p[2] == '<')
+ {
+ *heredoc = TRUE;
+ return 3;
+ }
+ return 1;
+ }
+ if (vim_strchr((char_u *)"+-*/%", *p) != NULL && p[1] == '=')
+ return 2;
+ if (STRNCMP(p, "..=", 3) == 0)
+ return 3;
+ return 0;
+}
+
+// words that cannot be used as a variable
+static char *reserved[] = {
+ "true",
+ "false",
+ NULL
+};
+
+/*
+ * Get a line for "=<<".
+ * Return a pointer to the line in allocated memory.
+ * Return NULL for end-of-file or some error.
+ */
+ static char_u *
+heredoc_getline(
+ int c UNUSED,
+ void *cookie,
+ int indent UNUSED,
+ int do_concat UNUSED)
+{
+ cctx_T *cctx = (cctx_T *)cookie;
+
+ if (cctx->ctx_lnum == cctx->ctx_ufunc->uf_lines.ga_len)
+ NULL;
+ ++cctx->ctx_lnum;
+ return vim_strsave(((char_u **)cctx->ctx_ufunc->uf_lines.ga_data)
+ [cctx->ctx_lnum]);
+}
+
+/*
+ * compile "let var [= expr]", "const var = expr" and "var = expr"
+ * "arg" points to "var".
+ */
+ static char_u *
+compile_assignment(char_u *arg, exarg_T *eap, cmdidx_T cmdidx, cctx_T *cctx)
+{
+ char_u *p;
+ char_u *ret = NULL;
+ int var_count = 0;
+ int semicolon = 0;
+ size_t varlen;
+ garray_T *instr = &cctx->ctx_instr;
+ int idx = -1;
+ char_u *op;
+ int option = FALSE;
+ int opt_type;
+ int opt_flags = 0;
+ int global = FALSE;
+ int script = FALSE;
+ int oplen = 0;
+ int heredoc = FALSE;
+ type_T *type;
+ lvar_T *lvar;
+ char_u *name;
+ char_u *sp;
+ int has_type = FALSE;
+ int is_decl = cmdidx == CMD_let || cmdidx == CMD_const;
+ int instr_count = -1;
+
+ p = skip_var_list(arg, FALSE, &var_count, &semicolon);
+ if (p == NULL)
+ return NULL;
+ if (var_count > 0)
+ {
+ // TODO: let [var, var] = list
+ emsg("Cannot handle a list yet");
+ return NULL;
+ }
+
+ varlen = p - arg;
+ name = vim_strnsave(arg, (int)varlen);
+ if (name == NULL)
+ return NULL;
+
+ if (*arg == '&')
+ {
+ int cc;
+ long numval;
+ char_u *stringval = NULL;
+
+ option = TRUE;
+ if (cmdidx == CMD_const)
+ {
+ emsg(_(e_const_option));
+ return NULL;
+ }
+ if (is_decl)
+ {
+ semsg(_("E1052: Cannot declare an option: %s"), arg);
+ goto theend;
+ }
+ p = arg;
+ p = find_option_end(&p, &opt_flags);
+ if (p == NULL)
+ {
+ emsg(_(e_letunexp));
+ return NULL;
+ }
+ cc = *p;
+ *p = NUL;
+ opt_type = get_option_value(arg + 1, &numval, &stringval, opt_flags);
+ *p = cc;
+ if (opt_type == -3)
+ {
+ semsg(_(e_unknown_option), *arg);
+ return NULL;
+ }
+ if (opt_type == -2 || opt_type == 0)
+ type = &t_string;
+ else
+ type = &t_number; // both number and boolean option
+ }
+ else if (STRNCMP(arg, "g:", 2) == 0)
+ {
+ global = TRUE;
+ if (is_decl)
+ {
+ semsg(_("E1016: Cannot declare a global variable: %s"), name);
+ goto theend;
+ }
+ }
+ else
+ {
+ for (idx = 0; reserved[idx] != NULL; ++idx)
+ if (STRCMP(reserved[idx], name) == 0)
+ {
+ semsg(_("E1034: Cannot use reserved name %s"), name);
+ goto theend;
+ }
+
+ idx = lookup_local(arg, varlen, cctx);
+ if (idx >= 0)
+ {
+ if (is_decl)
+ {
+ semsg(_("E1017: Variable already declared: %s"), name);
+ goto theend;
+ }
+ else
+ {
+ lvar = ((lvar_T *)cctx->ctx_locals.ga_data) + idx;
+ if (lvar->lv_const)
+ {
+ semsg(_("E1018: Cannot assign to a constant: %s"), name);
+ goto theend;
+ }
+ }
+ }
+ else if (lookup_script(arg, varlen) == OK)
+ {
+ script = TRUE;
+ if (is_decl)
+ {
+ semsg(_("E1054: Variable already declared in the script: %s"),
+ name);
+ goto theend;
+ }
+ }
+ }
+
+ if (!option)
+ {
+ if (is_decl && *p == ':')
+ {
+ // parse optional type: "let var: type = expr"
+ p = skipwhite(p + 1);
+ type = parse_type(&p, cctx->ctx_type_list);
+ if (type == NULL)
+ goto theend;
+ has_type = TRUE;
+ }
+ else if (idx < 0)
+ {
+ // global and new local default to "any" type
+ type = &t_any;
+ }
+ else
+ {
+ lvar = ((lvar_T *)cctx->ctx_locals.ga_data) + idx;
+ type = lvar->lv_type;
+ }
+ }
+
+ sp = p;
+ p = skipwhite(p);
+ op = p;
+ oplen = assignment_len(p, &heredoc);
+ if (oplen > 0 && (!VIM_ISWHITE(*sp) || !VIM_ISWHITE(op[oplen])))
+ {
+ char_u buf[4];
+
+ vim_strncpy(buf, op, oplen);
+ semsg(_(e_white_both), buf);
+ }
+
+ if (oplen == 3 && !heredoc && !global && type->tt_type != VAR_STRING
+ && type->tt_type != VAR_UNKNOWN)
+ {
+ emsg("E1019: Can only concatenate to string");
+ goto theend;
+ }
+
+ // +=, /=, etc. require an existing variable
+ if (idx < 0 && !global && !option)
+ {
+ if (oplen > 1 && !heredoc)
+ {
+ semsg(_("E1020: cannot use an operator on a new variable: %s"),
+ name);
+ goto theend;
+ }
+
+ // new local variable
+ idx = reserve_local(cctx, arg, varlen, cmdidx == CMD_const, type);
+ if (idx < 0)
+ goto theend;
+ }
+
+ if (heredoc)
+ {
+ list_T *l;
+ listitem_T *li;
+
+ // [let] varname =<< [trim] {end}
+ eap->getline = heredoc_getline;
+ eap->cookie = cctx;
+ l = heredoc_get(eap, op + 3);
+
+ // Push each line and the create the list.
+ for (li = l->lv_first; li != NULL; li = li->li_next)
+ {
+ generate_PUSHS(cctx, li->li_tv.vval.v_string);
+ li->li_tv.vval.v_string = NULL;
+ }
+ generate_NEWLIST(cctx, l->lv_len);
+ type = &t_list_string;
+ list_free(l);
+ p += STRLEN(p);
+ }
+ else if (oplen > 0)
+ {
+ // for "+=", "*=", "..=" etc. first load the current value
+ if (*op != '=')
+ {
+ if (option)
+ generate_LOAD(cctx, ISN_LOADOPT, 0, name + 1, type);
+ else if (global)
+ generate_LOAD(cctx, ISN_LOADG, 0, name + 2, type);
+ else
+ generate_LOAD(cctx, ISN_LOAD, idx, NULL, type);
+ }
+
+ // compile the expression
+ instr_count = instr->ga_len;
+ p = skipwhite(p + oplen);
+ if (compile_expr1(&p, cctx) == FAIL)
+ goto theend;
+
+ if (idx >= 0 && (is_decl || !has_type))
+ {
+ garray_T *stack = &cctx->ctx_type_stack;
+ type_T *stacktype =
+ ((type_T **)stack->ga_data)[stack->ga_len - 1];
+
+ lvar = ((lvar_T *)cctx->ctx_locals.ga_data) + idx;
+ if (!has_type)
+ {
+ if (stacktype->tt_type == VAR_VOID)
+ {
+ emsg(_("E1031: Cannot use void value"));
+ goto theend;
+ }
+ else
+ lvar->lv_type = stacktype;
+ }
+ else
+ if (check_type(lvar->lv_type, stacktype, TRUE) == FAIL)
+ goto theend;
+ }
+ }
+ else if (cmdidx == CMD_const)
+ {
+ emsg(_("E1021: const requires a value"));
+ goto theend;
+ }
+ else if (!has_type || option)
+ {
+ emsg(_("E1022: type or initialization required"));
+ goto theend;
+ }
+ else
+ {
+ // variables are always initialized
+ // TODO: support more types
+ if (ga_grow(instr, 1) == FAIL)
+ goto theend;
+ if (type->tt_type == VAR_STRING)
+ generate_PUSHS(cctx, vim_strsave((char_u *)""));
+ else
+ generate_PUSHNR(cctx, 0);
+ }
+
+ if (oplen > 0 && *op != '=')
+ {
+ type_T *expected = &t_number;
+ garray_T *stack = &cctx->ctx_type_stack;
+ type_T *stacktype;
+
+ // TODO: if type is known use float or any operation
+
+ if (*op == '.')
+ expected = &t_string;
+ stacktype = ((type_T **)stack->ga_data)[stack->ga_len - 1];
+ if (need_type(stacktype, expected, -1, cctx) == FAIL)
+ goto theend;
+
+ if (*op == '.')
+ generate_instr_drop(cctx, ISN_CONCAT, 1);
+ else
+ {
+ isn_T *isn = generate_instr_drop(cctx, ISN_OPNR, 1);
+
+ if (isn == NULL)
+ goto theend;
+ switch (*op)
+ {
+ case '+': isn->isn_arg.op.op_type = EXPR_ADD; break;
+ case '-': isn->isn_arg.op.op_type = EXPR_SUB; break;
+ case '*': isn->isn_arg.op.op_type = EXPR_MULT; break;
+ case '/': isn->isn_arg.op.op_type = EXPR_DIV; break;
+ case '%': isn->isn_arg.op.op_type = EXPR_REM; break;
+ }
+ }
+ }
+
+ if (option)
+ generate_STOREOPT(cctx, name + 1, opt_flags);
+ else if (global)
+ generate_STORE(cctx, ISN_STOREG, 0, name + 2);
+ else if (script)
+ {
+ idx = get_script_item_idx(current_sctx.sc_sid, name, TRUE);
+ // TODO: specific type
+ generate_SCRIPT(cctx, ISN_STORESCRIPT,
+ current_sctx.sc_sid, idx, &t_any);
+ }
+ else
+ {
+ isn_T *isn = ((isn_T *)instr->ga_data) + instr->ga_len - 1;
+
+ // optimization: turn "var = 123" from ISN_PUSHNR + ISN_STORE into
+ // ISN_STORENR
+ if (instr->ga_len == instr_count + 1 && isn->isn_type == ISN_PUSHNR)
+ {
+ varnumber_T val = isn->isn_arg.number;
+ garray_T *stack = &cctx->ctx_type_stack;
+
+ isn->isn_type = ISN_STORENR;
+ isn->isn_arg.storenr.str_idx = idx;
+ isn->isn_arg.storenr.str_val = val;
+ if (stack->ga_len > 0)
+ --stack->ga_len;
+ }
+ else
+ generate_STORE(cctx, ISN_STORE, idx, NULL);
+ }
+ ret = p;
+
+theend:
+ vim_free(name);
+ return ret;
+}
+
+/*
+ * Compile an :import command.
+ */
+ static char_u *
+compile_import(char_u *arg, cctx_T *cctx)
+{
+ return handle_import(arg, &cctx->ctx_imports, 0);
+}
+
+/*
+ * generate a jump to the ":endif"/":endfor"/":endwhile"/":finally"/":endtry".
+ */
+ static int
+compile_jump_to_end(endlabel_T **el, jumpwhen_T when, cctx_T *cctx)
+{
+ garray_T *instr = &cctx->ctx_instr;
+ endlabel_T *endlabel = ALLOC_CLEAR_ONE(endlabel_T);
+
+ if (endlabel == NULL)
+ return FAIL;
+ endlabel->el_next = *el;
+ *el = endlabel;
+ endlabel->el_end_label = instr->ga_len;
+
+ generate_JUMP(cctx, when, 0);
+ return OK;
+}
+
+ static void
+compile_fill_jump_to_end(endlabel_T **el, cctx_T *cctx)
+{
+ garray_T *instr = &cctx->ctx_instr;
+
+ while (*el != NULL)
+ {
+ endlabel_T *cur = (*el);
+ isn_T *isn;
+
+ isn = ((isn_T *)instr->ga_data) + cur->el_end_label;
+ isn->isn_arg.jump.jump_where = instr->ga_len;
+ *el = cur->el_next;
+ vim_free(cur);
+ }
+}
+
+/*
+ * Create a new scope and set up the generic items.
+ */
+ static scope_T *
+new_scope(cctx_T *cctx, scopetype_T type)
+{
+ scope_T *scope = ALLOC_CLEAR_ONE(scope_T);
+
+ if (scope == NULL)
+ return NULL;
+ scope->se_outer = cctx->ctx_scope;
+ cctx->ctx_scope = scope;
+ scope->se_type = type;
+ scope->se_local_count = cctx->ctx_locals.ga_len;
+ return scope;
+}
+
+/*
+ * compile "if expr"
+ *
+ * "if expr" Produces instructions:
+ * EVAL expr Push result of "expr"
+ * JUMP_IF_FALSE end
+ * ... body ...
+ * end:
+ *
+ * "if expr | else" Produces instructions:
+ * EVAL expr Push result of "expr"
+ * JUMP_IF_FALSE else
+ * ... body ...
+ * JUMP_ALWAYS end
+ * else:
+ * ... body ...
+ * end:
+ *
+ * "if expr1 | elseif expr2 | else" Produces instructions:
+ * EVAL expr Push result of "expr"
+ * JUMP_IF_FALSE elseif
+ * ... body ...
+ * JUMP_ALWAYS end
+ * elseif:
+ * EVAL expr Push result of "expr"
+ * JUMP_IF_FALSE else
+ * ... body ...
+ * JUMP_ALWAYS end
+ * else:
+ * ... body ...
+ * end:
+ */
+ static char_u *
+compile_if(char_u *arg, cctx_T *cctx)
+{
+ char_u *p = arg;
+ garray_T *instr = &cctx->ctx_instr;
+ scope_T *scope;
+
+ // compile "expr"
+ if (compile_expr1(&p, cctx) == FAIL)
+ return NULL;
+
+ scope = new_scope(cctx, IF_SCOPE);
+ if (scope == NULL)
+ return NULL;
+
+ // "where" is set when ":elseif", "else" or ":endif" is found
+ scope->se_if.is_if_label = instr->ga_len;
+ generate_JUMP(cctx, JUMP_IF_FALSE, 0);
+
+ return p;
+}
+
+ static char_u *
+compile_elseif(char_u *arg, cctx_T *cctx)
+{
+ char_u *p = arg;
+ garray_T *instr = &cctx->ctx_instr;
+ isn_T *isn;
+ scope_T *scope = cctx->ctx_scope;
+
+ if (scope == NULL || scope->se_type != IF_SCOPE)
+ {
+ emsg(_(e_elseif_without_if));
+ return NULL;
+ }
+ cctx->ctx_locals.ga_len = scope->se_local_count;
+
+ // jump from previous block to the end
+ if (compile_jump_to_end(&scope->se_if.is_end_label,
+ JUMP_ALWAYS, cctx) == FAIL)
+ return NULL;
+
+ // previous "if" or "elseif" jumps here
+ isn = ((isn_T *)instr->ga_data) + scope->se_if.is_if_label;
+ isn->isn_arg.jump.jump_where = instr->ga_len;
+
+ // compile "expr"
+ if (compile_expr1(&p, cctx) == FAIL)
+ return NULL;
+
+ // "where" is set when ":elseif", "else" or ":endif" is found
+ scope->se_if.is_if_label = instr->ga_len;
+ generate_JUMP(cctx, JUMP_IF_FALSE, 0);
+
+ return p;
+}
+
+ static char_u *
+compile_else(char_u *arg, cctx_T *cctx)
+{
+ char_u *p = arg;
+ garray_T *instr = &cctx->ctx_instr;
+ isn_T *isn;
+ scope_T *scope = cctx->ctx_scope;
+
+ if (scope == NULL || scope->se_type != IF_SCOPE)
+ {
+ emsg(_(e_else_without_if));
+ return NULL;
+ }
+ cctx->ctx_locals.ga_len = scope->se_local_count;
+
+ // jump from previous block to the end
+ if (compile_jump_to_end(&scope->se_if.is_end_label,
+ JUMP_ALWAYS, cctx) == FAIL)
+ return NULL;
+
+ // previous "if" or "elseif" jumps here
+ isn = ((isn_T *)instr->ga_data) + scope->se_if.is_if_label;
+ isn->isn_arg.jump.jump_where = instr->ga_len;
+
+ return p;
+}
+
+ static char_u *
+compile_endif(char_u *arg, cctx_T *cctx)
+{
+ scope_T *scope = cctx->ctx_scope;
+ ifscope_T *ifscope;
+ garray_T *instr = &cctx->ctx_instr;
+ isn_T *isn;
+
+ if (scope == NULL || scope->se_type != IF_SCOPE)
+ {
+ emsg(_(e_endif_without_if));
+ return NULL;
+ }
+ ifscope = &scope->se_if;
+ cctx->ctx_scope = scope->se_outer;
+ cctx->ctx_locals.ga_len = scope->se_local_count;
+
+ // previous "if" or "elseif" jumps here
+ isn = ((isn_T *)instr->ga_data) + scope->se_if.is_if_label;
+ isn->isn_arg.jump.jump_where = instr->ga_len;
+
+ // Fill in the "end" label in jumps at the end of the blocks.
+ compile_fill_jump_to_end(&ifscope->is_end_label, cctx);
+
+ vim_free(scope);
+ return arg;
+}
+
+/*
+ * compile "for var in expr"
+ *
+ * Produces instructions:
+ * PUSHNR -1
+ * STORE loop-idx Set index to -1
+ * EVAL expr Push result of "expr"
+ * top: FOR loop-idx, end Increment index, use list on bottom of stack
+ * - if beyond end, jump to "end"
+ * - otherwise get item from list and push it
+ * STORE var Store item in "var"
+ * ... body ...
+ * JUMP top Jump back to repeat
+ * end: DROP Drop the result of "expr"
+ *
+ */
+ static char_u *
+compile_for(char_u *arg, cctx_T *cctx)
+{
+ char_u *p;
+ size_t varlen;
+ garray_T *instr = &cctx->ctx_instr;
+ garray_T *stack = &cctx->ctx_type_stack;
+ scope_T *scope;
+ int loop_idx; // index of loop iteration variable
+ int var_idx; // index of "var"
+ type_T *vartype;
+
+ // TODO: list of variables: "for [key, value] in dict"
+ // parse "var"
+ for (p = arg; eval_isnamec1(*p); ++p)
+ ;
+ varlen = p - arg;
+ var_idx = lookup_local(arg, varlen, cctx);
+ if (var_idx >= 0)
+ {
+ semsg(_("E1023: variable already defined: %s"), arg);
+ return NULL;
+ }
+
+ // consume "in"
+ p = skipwhite(p);
+ if (STRNCMP(p, "in", 2) != 0 || !VIM_ISWHITE(p[2]))
+ {
+ emsg(_(e_missing_in));
+ return NULL;
+ }
+ p = skipwhite(p + 2);
+
+
+ scope = new_scope(cctx, FOR_SCOPE);
+ if (scope == NULL)
+ return NULL;
+
+ // Reserve a variable to store the loop iteration counter.
+ loop_idx = reserve_local(cctx, (char_u *)"", 0, FALSE, &t_number);
+ if (loop_idx < 0)
+ return NULL;
+
+ // Reserve a variable to store "var"
+ var_idx = reserve_local(cctx, arg, varlen, FALSE, &t_any);
+ if (var_idx < 0)
+ return NULL;
+
+ generate_STORENR(cctx, loop_idx, -1);
+
+ // compile "expr", it remains on the stack until "endfor"
+ arg = p;
+ if (compile_expr1(&arg, cctx) == FAIL)
+ return NULL;
+
+ // now we know the type of "var"
+ vartype = ((type_T **)stack->ga_data)[stack->ga_len - 1];
+ if (vartype->tt_type != VAR_LIST)
+ {
+ emsg(_("E1024: need a List to iterate over"));
+ return NULL;
+ }
+ if (vartype->tt_member->tt_type != VAR_UNKNOWN)
+ {
+ lvar_T *lvar = ((lvar_T *)cctx->ctx_locals.ga_data) + var_idx;
+
+ lvar->lv_type = vartype->tt_member;
+ }
+
+ // "for_end" is set when ":endfor" is found
+ scope->se_for.fs_top_label = instr->ga_len;
+
+ generate_FOR(cctx, loop_idx);
+ generate_STORE(cctx, ISN_STORE, var_idx, NULL);
+
+ return arg;
+}
+
+/*
+ * compile "endfor"
+ */
+ static char_u *
+compile_endfor(char_u *arg, cctx_T *cctx)
+{
+ garray_T *instr = &cctx->ctx_instr;
+ scope_T *scope = cctx->ctx_scope;
+ forscope_T *forscope;
+ isn_T *isn;
+
+ if (scope == NULL || scope->se_type != FOR_SCOPE)
+ {
+ emsg(_(e_for));
+ return NULL;
+ }
+ forscope = &scope->se_for;
+ cctx->ctx_scope = scope->se_outer;
+ cctx->ctx_locals.ga_len = scope->se_local_count;
+
+ // At end of ":for" scope jump back to the FOR instruction.
+ generate_JUMP(cctx, JUMP_ALWAYS, forscope->fs_top_label);
+
+ // Fill in the "end" label in the FOR statement so it can jump here
+ isn = ((isn_T *)instr->ga_data) + forscope->fs_top_label;
+ isn->isn_arg.forloop.for_end = instr->ga_len;
+
+ // Fill in the "end" label any BREAK statements
+ compile_fill_jump_to_end(&forscope->fs_end_label, cctx);
+
+ // Below the ":for" scope drop the "expr" list from the stack.
+ if (generate_instr_drop(cctx, ISN_DROP, 1) == NULL)
+ return NULL;
+
+ vim_free(scope);
+
+ return arg;
+}
+
+/*
+ * compile "while expr"
+ *
+ * Produces instructions:
+ * top: EVAL expr Push result of "expr"
+ * JUMP_IF_FALSE end jump if false
+ * ... body ...
+ * JUMP top Jump back to repeat
+ * end:
+ *
+ */
+ static char_u *
+compile_while(char_u *arg, cctx_T *cctx)
+{
+ char_u *p = arg;
+ garray_T *instr = &cctx->ctx_instr;
+ scope_T *scope;
+
+ scope = new_scope(cctx, WHILE_SCOPE);
+ if (scope == NULL)
+ return NULL;
+
+ scope->se_while.ws_top_label = instr->ga_len;
+
+ // compile "expr"
+ if (compile_expr1(&p, cctx) == FAIL)
+ return NULL;
+
+ // "while_end" is set when ":endwhile" is found
+ if (compile_jump_to_end(&scope->se_while.ws_end_label,
+ JUMP_IF_FALSE, cctx) == FAIL)
+ return FAIL;
+
+ return p;
+}
+
+/*
+ * compile "endwhile"
+ */
+ static char_u *
+compile_endwhile(char_u *arg, cctx_T *cctx)
+{
+ scope_T *scope = cctx->ctx_scope;
+
+ if (scope == NULL || scope->se_type != WHILE_SCOPE)
+ {
+ emsg(_(e_while));
+ return NULL;
+ }
+ cctx->ctx_scope = scope->se_outer;
+ cctx->ctx_locals.ga_len = scope->se_local_count;
+
+ // At end of ":for" scope jump back to the FOR instruction.
+ generate_JUMP(cctx, JUMP_ALWAYS, scope->se_while.ws_top_label);
+
+ // Fill in the "end" label in the WHILE statement so it can jump here.
+ // And in any jumps for ":break"
+ compile_fill_jump_to_end(&scope->se_while.ws_end_label, cctx);
+
+ vim_free(scope);
+
+ return arg;
+}
+
+/*
+ * compile "continue"
+ */
+ static char_u *
+compile_continue(char_u *arg, cctx_T *cctx)
+{
+ scope_T *scope = cctx->ctx_scope;
+
+ for (;;)
+ {
+ if (scope == NULL)
+ {
+ emsg(_(e_continue));
+ return NULL;
+ }
+ if (scope->se_type == FOR_SCOPE || scope->se_type == WHILE_SCOPE)
+ break;
+ scope = scope->se_outer;
+ }
+
+ // Jump back to the FOR or WHILE instruction.
+ generate_JUMP(cctx, JUMP_ALWAYS,
+ scope->se_type == FOR_SCOPE ? scope->se_for.fs_top_label
+ : scope->se_while.ws_top_label);
+ return arg;
+}
+
+/*
+ * compile "break"
+ */
+ static char_u *
+compile_break(char_u *arg, cctx_T *cctx)
+{
+ scope_T *scope = cctx->ctx_scope;
+ endlabel_T **el;
+
+ for (;;)
+ {
+ if (scope == NULL)
+ {
+ emsg(_(e_break));
+ return NULL;
+ }
+ if (scope->se_type == FOR_SCOPE || scope->se_type == WHILE_SCOPE)
+ break;
+ scope = scope->se_outer;
+ }
+
+ // Jump to the end of the FOR or WHILE loop.
+ if (scope->se_type == FOR_SCOPE)
+ el = &scope->se_for.fs_end_label;
+ else
+ el = &scope->se_while.ws_end_label;
+ if (compile_jump_to_end(el, JUMP_ALWAYS, cctx) == FAIL)
+ return FAIL;
+
+ return arg;
+}
+
+/*
+ * compile "{" start of block
+ */
+ static char_u *
+compile_block(char_u *arg, cctx_T *cctx)
+{
+ if (new_scope(cctx, BLOCK_SCOPE) == NULL)
+ return NULL;
+ return skipwhite(arg + 1);
+}
+
+/*
+ * compile end of block: drop one scope
+ */
+ static void
+compile_endblock(cctx_T *cctx)
+{
+ scope_T *scope = cctx->ctx_scope;
+
+ cctx->ctx_scope = scope->se_outer;
+ cctx->ctx_locals.ga_len = scope->se_local_count;
+ vim_free(scope);
+}
+
+/*
+ * compile "try"
+ * Creates a new scope for the try-endtry, pointing to the first catch and
+ * finally.
+ * Creates another scope for the "try" block itself.
+ * TRY instruction sets up exception handling at runtime.
+ *
+ * "try"
+ * TRY -> catch1, -> finally push trystack entry
+ * ... try block
+ * "throw {exception}"
+ * EVAL {exception}
+ * THROW create exception
+ * ... try block
+ * " catch {expr}"
+ * JUMP -> finally
+ * catch1: PUSH exeception
+ * EVAL {expr}
+ * MATCH
+ * JUMP nomatch -> catch2
+ * CATCH remove exception
+ * ... catch block
+ * " catch"
+ * JUMP -> finally
+ * catch2: CATCH remove exception
+ * ... catch block
+ * " finally"
+ * finally:
+ * ... finally block
+ * " endtry"
+ * ENDTRY pop trystack entry, may rethrow
+ */
+ static char_u *
+compile_try(char_u *arg, cctx_T *cctx)
+{
+ garray_T *instr = &cctx->ctx_instr;
+ scope_T *try_scope;
+ scope_T *scope;
+
+ // scope that holds the jumps that go to catch/finally/endtry
+ try_scope = new_scope(cctx, TRY_SCOPE);
+ if (try_scope == NULL)
+ return NULL;
+
+ // "catch" is set when the first ":catch" is found.
+ // "finally" is set when ":finally" or ":endtry" is found
+ try_scope->se_try.ts_try_label = instr->ga_len;
+ if (generate_instr(cctx, ISN_TRY) == NULL)
+ return NULL;
+
+ // scope for the try block itself
+ scope = new_scope(cctx, BLOCK_SCOPE);
+ if (scope == NULL)
+ return NULL;
+
+ return arg;
+}
+
+/*
+ * compile "catch {expr}"
+ */
+ static char_u *
+compile_catch(char_u *arg, cctx_T *cctx UNUSED)
+{
+ scope_T *scope = cctx->ctx_scope;
+ garray_T *instr = &cctx->ctx_instr;
+ char_u *p;
+ isn_T *isn;
+
+ // end block scope from :try or :catch
+ if (scope != NULL && scope->se_type == BLOCK_SCOPE)
+ compile_endblock(cctx);
+ scope = cctx->ctx_scope;
+
+ // Error if not in a :try scope
+ if (scope == NULL || scope->se_type != TRY_SCOPE)
+ {
+ emsg(_(e_catch));
+ return NULL;
+ }
+
+ if (scope->se_try.ts_caught_all)
+ {
+ emsg(_("E1033: catch unreachable after catch-all"));
+ return NULL;
+ }
+
+ // Jump from end of previous block to :finally or :endtry
+ if (compile_jump_to_end(&scope->se_try.ts_end_label,
+ JUMP_ALWAYS, cctx) == FAIL)
+ return NULL;
+
+ // End :try or :catch scope: set value in ISN_TRY instruction
+ isn = ((isn_T *)instr->ga_data) + scope->se_try.ts_try_label;
+ if (isn->isn_arg.try.try_catch == 0)
+ isn->isn_arg.try.try_catch = instr->ga_len;
+ if (scope->se_try.ts_catch_label != 0)
+ {
+ // Previous catch without match jumps here
+ isn = ((isn_T *)instr->ga_data) + scope->se_try.ts_catch_label;
+ isn->isn_arg.jump.jump_where = instr->ga_len;
+ }
+
+ p = skipwhite(arg);
+ if (ends_excmd(*p))
+ {
+ scope->se_try.ts_caught_all = TRUE;
+ scope->se_try.ts_catch_label = 0;
+ }
+ else
+ {
+ // Push v:exception, push {expr} and MATCH
+ generate_instr_type(cctx, ISN_PUSHEXC, &t_string);
+
+ if (compile_expr1(&p, cctx) == FAIL)
+ return NULL;
+
+ // TODO: check for strings?
+ if (generate_COMPARE(cctx, EXPR_MATCH, FALSE) == FAIL)
+ return NULL;
+
+ scope->se_try.ts_catch_label = instr->ga_len;
+ if (generate_JUMP(cctx, JUMP_IF_FALSE, 0) == FAIL)
+ return NULL;
+ }
+
+ if (generate_instr(cctx, ISN_CATCH) == NULL)
+ return NULL;
+
+ if (new_scope(cctx, BLOCK_SCOPE) == NULL)
+ return NULL;
+ return p;
+}
+
+ static char_u *
+compile_finally(char_u *arg, cctx_T *cctx)
+{
+ scope_T *scope = cctx->ctx_scope;
+ garray_T *instr = &cctx->ctx_instr;
+ isn_T *isn;
+
+ // end block scope from :try or :catch
+ if (scope != NULL && scope->se_type == BLOCK_SCOPE)
+ compile_endblock(cctx);
+ scope = cctx->ctx_scope;
+
+ // Error if not in a :try scope
+ if (scope == NULL || scope->se_type != TRY_SCOPE)
+ {
+ emsg(_(e_finally));
+ return NULL;
+ }
+
+ // End :catch or :finally scope: set value in ISN_TRY instruction
+ isn = ((isn_T *)instr->ga_data) + scope->se_try.ts_try_label;
+ if (isn->isn_arg.try.try_finally != 0)
+ {
+ emsg(_(e_finally_dup));
+ return NULL;
+ }
+
+ // Fill in the "end" label in jumps at the end of the blocks.
+ compile_fill_jump_to_end(&scope->se_try.ts_end_label, cctx);
+
+ if (scope->se_try.ts_catch_label != 0)
+ {
+ // Previous catch without match jumps here
+ isn = ((isn_T *)instr->ga_data) + scope->se_try.ts_catch_label;
+ isn->isn_arg.jump.jump_where = instr->ga_len;
+ }
+
+ isn->isn_arg.try.try_finally = instr->ga_len;
+ // TODO: set index in ts_finally_label jumps
+
+ return arg;
+}
+
+ static char_u *
+compile_endtry(char_u *arg, cctx_T *cctx)
+{
+ scope_T *scope = cctx->ctx_scope;
+ garray_T *instr = &cctx->ctx_instr;
+ isn_T *isn;
+
+ // end block scope from :catch or :finally
+ if (scope != NULL && scope->se_type == BLOCK_SCOPE)
+ compile_endblock(cctx);
+ scope = cctx->ctx_scope;
+
+ // Error if not in a :try scope
+ if (scope == NULL || scope->se_type != TRY_SCOPE)
+ {
+ if (scope == NULL)
+ emsg(_(e_no_endtry));
+ else if (scope->se_type == WHILE_SCOPE)
+ emsg(_(e_endwhile));
+ if (scope->se_type == FOR_SCOPE)
+ emsg(_(e_endfor));
+ else
+ emsg(_(e_endif));
+ return NULL;
+ }
+
+ isn = ((isn_T *)instr->ga_data) + scope->se_try.ts_try_label;
+ if (isn->isn_arg.try.try_catch == 0 && isn->isn_arg.try.try_finally == 0)
+ {
+ emsg(_("E1032: missing :catch or :finally"));
+ return NULL;
+ }
+
+ // Fill in the "end" label in jumps at the end of the blocks, if not done
+ // by ":finally".
+ compile_fill_jump_to_end(&scope->se_try.ts_end_label, cctx);
+
+ // End :catch or :finally scope: set value in ISN_TRY instruction
+ if (isn->isn_arg.try.try_finally == 0)
+ isn->isn_arg.try.try_finally = instr->ga_len;
+ compile_endblock(cctx);
+
+ if (generate_instr(cctx, ISN_ENDTRY) == NULL)
+ return NULL;
+ return arg;
+}
+
+/*
+ * compile "throw {expr}"
+ */
+ static char_u *
+compile_throw(char_u *arg, cctx_T *cctx UNUSED)
+{
+ char_u *p = skipwhite(arg);
+
+ if (ends_excmd(*p))
+ {
+ emsg(_(e_argreq));
+ return NULL;
+ }
+ if (compile_expr1(&p, cctx) == FAIL)
+ return NULL;
+ if (may_generate_2STRING(-1, cctx) == FAIL)
+ return NULL;
+ if (generate_instr_drop(cctx, ISN_THROW, 1) == NULL)
+ return NULL;
+
+ return p;
+}
+
+/*
+ * compile "echo expr"
+ */
+ static char_u *
+compile_echo(char_u *arg, int with_white, cctx_T *cctx)
+{
+ char_u *p = arg;
+ int count = 0;
+
+ // for ()
+ {
+ if (compile_expr1(&p, cctx) == FAIL)
+ return NULL;
+ ++count;
+ }
+
+ generate_ECHO(cctx, with_white, count);
+
+ return p;
+}
+
+/*
+ * After ex_function() has collected all the function lines: parse and compile
+ * the lines into instructions.
+ * Adds the function to "def_functions".
+ * When "set_return_type" is set then set ufunc->uf_ret_type to the type of the
+ * return statement (used for lambda).
+ */
+ void
+compile_def_function(ufunc_T *ufunc, int set_return_type)
+{
+ dfunc_T *dfunc;
+ char_u *line = NULL;
+ char_u *p;
+ exarg_T ea;
+ char *errormsg = NULL; // error message
+ int had_return = FALSE;
+ cctx_T cctx;
+ garray_T *instr;
+ int called_emsg_before = called_emsg;
+ int ret = FAIL;
+ sctx_T save_current_sctx = current_sctx;
+
+ if (ufunc->uf_dfunc_idx >= 0)
+ {
+ // redefining a function that was compiled before
+ dfunc = ((dfunc_T *)def_functions.ga_data) + ufunc->uf_dfunc_idx;
+ dfunc->df_deleted = FALSE;
+ }
+ else
+ {
+ // Add the function to "def_functions".
+ if (ga_grow(&def_functions, 1) == FAIL)
+ return;
+ dfunc = ((dfunc_T *)def_functions.ga_data) + def_functions.ga_len;
+ vim_memset(dfunc, 0, sizeof(dfunc_T));
+ dfunc->df_idx = def_functions.ga_len;
+ ufunc->uf_dfunc_idx = dfunc->df_idx;
+ dfunc->df_ufunc = ufunc;
+ ++def_functions.ga_len;
+ }
+
+ vim_memset(&cctx, 0, sizeof(cctx));
+ cctx.ctx_ufunc = ufunc;
+ cctx.ctx_lnum = -1;
+ ga_init2(&cctx.ctx_locals, sizeof(lvar_T), 10);
+ ga_init2(&cctx.ctx_type_stack, sizeof(type_T *), 50);
+ ga_init2(&cctx.ctx_imports, sizeof(imported_T), 10);
+ cctx.ctx_type_list = &ufunc->uf_type_list;
+ ga_init2(&cctx.ctx_instr, sizeof(isn_T), 50);
+ instr = &cctx.ctx_instr;
+
+ // Most modern script version.
+ current_sctx.sc_version = SCRIPT_VERSION_VIM9;
+
+ for (;;)
+ {
+ if (line != NULL && *line == '|')
+ // the line continues after a '|'
+ ++line;
+ else if (line != NULL && *line != NUL)
+ {
+ semsg(_("E488: Trailing characters: %s"), line);
+ goto erret;
+ }
+ else
+ {
+ do
+ {
+ ++cctx.ctx_lnum;
+ if (cctx.ctx_lnum == ufunc->uf_lines.ga_len)
+ break;
+ line = ((char_u **)ufunc->uf_lines.ga_data)[cctx.ctx_lnum];
+ } while (line == NULL);
+ if (cctx.ctx_lnum == ufunc->uf_lines.ga_len)
+ break;
+ SOURCING_LNUM = ufunc->uf_script_ctx.sc_lnum + cctx.ctx_lnum + 1;
+ }
+
+ had_return = FALSE;
+ vim_memset(&ea, 0, sizeof(ea));
+ ea.cmdlinep = &line;
+ ea.cmd = skipwhite(line);
+
+ // "}" ends a block scope
+ if (*ea.cmd == '}')
+ {
+ scopetype_T stype = cctx.ctx_scope == NULL
+ ? NO_SCOPE : cctx.ctx_scope->se_type;
+
+ if (stype == BLOCK_SCOPE)
+ {
+ compile_endblock(&cctx);
+ line = ea.cmd;
+ }
+ else
+ {
+ emsg("E1025: using } outside of a block scope");
+ goto erret;
+ }
+ if (line != NULL)
+ line = skipwhite(ea.cmd + 1);
+ continue;
+ }
+
+ // "{" starts a block scope
+ if (*ea.cmd == '{')
+ {
+ line = compile_block(ea.cmd, &cctx);
+ continue;
+ }
+
+ /*
+ * COMMAND MODIFIERS
+ */
+ if (parse_command_modifiers(&ea, &errormsg, FALSE) == FAIL)
+ {
+ if (errormsg != NULL)
+ goto erret;
+ // empty line or comment
+ line = (char_u *)"";
+ continue;
+ }
+
+ // Skip ":call" to get to the function name.
+ if (checkforcmd(&ea.cmd, "call", 3))
+ ea.cmd = skipwhite(ea.cmd);
+
+ // Assuming the command starts with a variable or function name, find
+ // what follows. Also "&opt = value".
+ p = (*ea.cmd == '&') ? ea.cmd + 1 : ea.cmd;
+ p = to_name_end(p);
+ if (p > ea.cmd && *p != NUL)
+ {
+ int oplen;
+ int heredoc;
+
+ // "funcname(" is always a function call.
+ // "varname[]" is an expression.
+ // "g:varname" is an expression.
+ // "varname->expr" is an expression.
+ if (*p == '('
+ || *p == '['
+ || ((p - ea.cmd) > 2 && ea.cmd[1] == ':')
+ || (*p == '-' && p[1] == '>'))
+ {
+ // TODO
+ }
+
+ oplen = assignment_len(skipwhite(p), &heredoc);
+ if (oplen > 0)
+ {
+ // Recognize an assignment if we recognize the variable name:
+ // "g:var = expr"
+ // "var = expr" where "var" is a local var name.
+ // "&opt = expr"
+ if (*ea.cmd == '&'
+ || ((p - ea.cmd) > 2 && ea.cmd[1] == ':')
+ || lookup_local(ea.cmd, p - ea.cmd, &cctx) >= 0
+ || lookup_script(ea.cmd, p - ea.cmd) == OK)
+ {
+ line = compile_assignment(ea.cmd, &ea, CMD_SIZE, &cctx);
+ if (line == NULL)
+ goto erret;
+ continue;
+ }
+ }
+ }
+
+ /*
+ * COMMAND after range
+ */
+ ea.cmd = skip_range(ea.cmd, NULL);
+ p = find_ex_command(&ea, NULL, lookup_local, &cctx);
+
+ if (p == ea.cmd && ea.cmdidx != CMD_SIZE)
+ {
+ // Expression or function call.
+ if (ea.cmdidx == CMD_eval)
+ {
+ p = ea.cmd;
+ if (compile_expr1(&p, &cctx) == FAIL)
+ goto erret;
+
+ // drop the return value
+ generate_instr_drop(&cctx, ISN_DROP, 1);
+ line = p;
+ continue;
+ }
+ if (ea.cmdidx == CMD_let)
+ {
+ line = compile_assignment(ea.cmd, &ea, CMD_SIZE, &cctx);
+ if (line == NULL)
+ goto erret;
+ continue;
+ }
+ iemsg("Command from find_ex_command() not handled");
+ goto erret;
+ }
+
+ p = skipwhite(p);
+
+ switch (ea.cmdidx)
+ {
+ case CMD_def:
+ case CMD_function:
+ // TODO: Nested function
+ emsg("Nested function not implemented yet");
+ goto erret;
+
+ case CMD_return:
+ line = compile_return(p, set_return_type, &cctx);
+ had_return = TRUE;
+ break;
+
+ case CMD_let:
+ case CMD_const:
+ line = compile_assignment(p, &ea, ea.cmdidx, &cctx);
+ break;
+
+ case CMD_import:
+ line = compile_import(p, &cctx);
+ break;
+
+ case CMD_if:
+ line = compile_if(p, &cctx);
+ break;
+ case CMD_elseif:
+ line = compile_elseif(p, &cctx);
+ break;
+ case CMD_else:
+ line = compile_else(p, &cctx);
+ break;
+ case CMD_endif:
+ line = compile_endif(p, &cctx);
+ break;
+
+ case CMD_while:
+ line = compile_while(p, &cctx);
+ break;
+ case CMD_endwhile:
+ line = compile_endwhile(p, &cctx);
+ break;
+
+ case CMD_for:
+ line = compile_for(p, &cctx);
+ break;
+ case CMD_endfor:
+ line = compile_endfor(p, &cctx);
+ break;
+ case CMD_continue:
+ line = compile_continue(p, &cctx);
+ break;
+ case CMD_break:
+ line = compile_break(p, &cctx);
+ break;
+
+ case CMD_try:
+ line = compile_try(p, &cctx);
+ break;
+ case CMD_catch:
+ line = compile_catch(p, &cctx);
+ break;
+ case CMD_finally:
+ line = compile_finally(p, &cctx);
+ break;
+ case CMD_endtry:
+ line = compile_endtry(p, &cctx);
+ break;
+ case CMD_throw:
+ line = compile_throw(p, &cctx);
+ break;
+
+ case CMD_echo:
+ line = compile_echo(p, TRUE, &cctx);
+ break;
+ case CMD_echon:
+ line = compile_echo(p, FALSE, &cctx);
+ break;
+
+ default:
+ // Not recognized, execute with do_cmdline_cmd().
+ generate_EXEC(&cctx, line);
+ line = (char_u *)"";
+ break;
+ }
+ if (line == NULL)
+ goto erret;
+
+ if (cctx.ctx_type_stack.ga_len < 0)
+ {
+ iemsg("Type stack underflow");
+ goto erret;
+ }
+ }
+
+ if (cctx.ctx_scope != NULL)
+ {
+ if (cctx.ctx_scope->se_type == IF_SCOPE)
+ emsg(_(e_endif));
+ else if (cctx.ctx_scope->se_type == WHILE_SCOPE)
+ emsg(_(e_endwhile));
+ else if (cctx.ctx_scope->se_type == FOR_SCOPE)
+ emsg(_(e_endfor));
+ else
+ emsg(_("E1026: Missing }"));
+ goto erret;
+ }
+
+ if (!had_return)
+ {
+ if (ufunc->uf_ret_type->tt_type != VAR_VOID)
+ {
+ emsg(_("E1027: Missing return statement"));
+ goto erret;
+ }
+
+ // Return zero if there is no return at the end.
+ generate_PUSHNR(&cctx, 0);
+ generate_instr(&cctx, ISN_RETURN);
+ }
+
+ dfunc->df_instr = instr->ga_data;
+ dfunc->df_instr_count = instr->ga_len;
+ dfunc->df_varcount = cctx.ctx_max_local;
+
+ ret = OK;
+
+erret:
+ if (ret == FAIL)
+ {
+ ga_clear(instr);
+ ufunc->uf_dfunc_idx = -1;
+ --def_functions.ga_len;
+ if (errormsg != NULL)
+ emsg(errormsg);
+ else if (called_emsg == called_emsg_before)
+ emsg("E1028: compile_def_function failed");
+
+ // don't execute this function body
+ ufunc->uf_lines.ga_len = 0;
+ }
+
+ current_sctx = save_current_sctx;
+ ga_clear(&cctx.ctx_type_stack);
+ ga_clear(&cctx.ctx_locals);
+}
+
+/*
+ * Delete an instruction, free what it contains.
+ */
+ static void
+delete_instr(isn_T *isn)
+{
+ switch (isn->isn_type)
+ {
+ case ISN_EXEC:
+ case ISN_LOADENV:
+ case ISN_LOADG:
+ case ISN_LOADOPT:
+ case ISN_MEMBER:
+ case ISN_PUSHEXC:
+ case ISN_PUSHS:
+ case ISN_STOREG:
+ vim_free(isn->isn_arg.string);
+ break;
+
+ case ISN_LOADS:
+ vim_free(isn->isn_arg.loads.ls_name);
+ break;
+
+ case ISN_STOREOPT:
+ vim_free(isn->isn_arg.storeopt.so_name);
+ break;
+
+ case ISN_PUSHBLOB: // push blob isn_arg.blob
+ blob_unref(isn->isn_arg.blob);
+ break;
+
+ case ISN_UCALL:
+ vim_free(isn->isn_arg.ufunc.cuf_name);
+ break;
+
+ case ISN_2BOOL:
+ case ISN_2STRING:
+ case ISN_ADDBLOB:
+ case ISN_ADDLIST:
+ case ISN_BCALL:
+ case ISN_CATCH:
+ case ISN_CHECKNR:
+ case ISN_CHECKTYPE:
+ case ISN_COMPAREANY:
+ case ISN_COMPAREBLOB:
+ case ISN_COMPAREBOOL:
+ case ISN_COMPAREDICT:
+ case ISN_COMPAREFLOAT:
+ case ISN_COMPAREFUNC:
+ case ISN_COMPARELIST:
+ case ISN_COMPARENR:
+ case ISN_COMPAREPARTIAL:
+ case ISN_COMPARESPECIAL:
+ case ISN_COMPARESTRING:
+ case ISN_CONCAT:
+ case ISN_DCALL:
+ case ISN_DROP:
+ case ISN_ECHO:
+ case ISN_ENDTRY:
+ case ISN_FOR:
+ case ISN_FUNCREF:
+ case ISN_INDEX:
+ case ISN_JUMP:
+ case ISN_LOAD:
+ case ISN_LOADSCRIPT:
+ case ISN_LOADREG:
+ case ISN_LOADV:
+ case ISN_NEGATENR:
+ case ISN_NEWDICT:
+ case ISN_NEWLIST:
+ case ISN_OPNR:
+ case ISN_OPFLOAT:
+ case ISN_OPANY:
+ case ISN_PCALL:
+ case ISN_PUSHF:
+ case ISN_PUSHNR:
+ case ISN_PUSHBOOL:
+ case ISN_PUSHSPEC:
+ case ISN_RETURN:
+ case ISN_STORE:
+ case ISN_STORENR:
+ case ISN_STORESCRIPT:
+ case ISN_THROW:
+ case ISN_TRY:
+ // nothing allocated
+ break;
+ }
+}
+
+/*
+ * When a user function is deleted, delete any associated def function.
+ */
+ void
+delete_def_function(ufunc_T *ufunc)
+{
+ int idx;
+
+ if (ufunc->uf_dfunc_idx >= 0)
+ {
+ dfunc_T *dfunc = ((dfunc_T *)def_functions.ga_data)
+ + ufunc->uf_dfunc_idx;
+ ga_clear(&dfunc->df_def_args_isn);
+
+ for (idx = 0; idx < dfunc->df_instr_count; ++idx)
+ delete_instr(dfunc->df_instr + idx);
+ VIM_CLEAR(dfunc->df_instr);
+
+ dfunc->df_deleted = TRUE;
+ }
+}
+
+#if defined(EXITFREE) || defined(PROTO)
+ void
+free_def_functions(void)
+{
+ vim_free(def_functions.ga_data);
+}
+#endif
+
+
+#endif // FEAT_EVAL