+/*-
+ * This code is derived from software copyrighted by the Free Software
+ * Foundation.
+ *
+ * Modified 1991 by Donn Seeley at UUNET Technologies, Inc.
+ * Modified 1990 by Van Jacobson at Lawrence Berkeley Laboratory.
+ */
+
+/* Parse C expressions for GDB.
+ Copyright (C) 1986, 1989 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+GDB is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 1, or (at your option)
+any later version.
+
+GDB is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GDB; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+\f
+/* Parse a C expression from text in a string,
+ and return the result as a struct expression pointer.
+ That structure contains arithmetic operations in reverse polish,
+ with constants represented by operations that are followed by special data.
+ See expression.h for the details of the format.
+ What is important here is that it can be built up sequentially
+ during the process of parsing; the lower levels of the tree always
+ come first in the result. */
+
+%{
+#ifndef lint
+static char sccsid[] = "@(#)expread.y 6.3 (Berkeley) 5/8/91";
+#endif /* not lint */
+
+#include <stdio.h>
+#include "defs.h"
+#include "param.h"
+#include "symtab.h"
+#include "frame.h"
+#include "expression.h"
+
+#include <a.out.h>
+
+static struct expression *expout;
+static int expout_size;
+static int expout_ptr;
+
+static int yylex ();
+static void yyerror ();
+static void write_exp_elt ();
+static void write_exp_elt_opcode ();
+static void write_exp_elt_sym ();
+static void write_exp_elt_longcst ();
+static void write_exp_elt_dblcst ();
+static void write_exp_elt_type ();
+static void write_exp_elt_intern ();
+static void write_exp_string ();
+static void start_arglist ();
+static int end_arglist ();
+static void free_funcalls ();
+static char *copy_name ();
+
+/* If this is nonzero, this block is used as the lexical context
+ for symbol names. */
+
+static struct block *expression_context_block;
+
+/* The innermost context required by the stack and register variables
+ we've encountered so far. */
+struct block *innermost_block;
+
+/* The block in which the most recently discovered symbol was found. */
+struct block *block_found;
+
+/* Number of arguments seen so far in innermost function call. */
+static int arglist_len;
+
+/* Data structure for saving values of arglist_len
+ for function calls whose arguments contain other function calls. */
+
+struct funcall
+ {
+ struct funcall *next;
+ int arglist_len;
+ };
+
+struct funcall *funcall_chain;
+
+/* This kind of datum is used to represent the name
+ of a symbol token. */
+
+struct stoken
+ {
+ char *ptr;
+ int length;
+ };
+
+/* For parsing of complicated types.
+ An array should be preceded in the list by the size of the array. */
+enum type_pieces
+ {tp_end = -1, tp_pointer, tp_reference, tp_array, tp_function};
+static enum type_pieces *type_stack;
+static int type_stack_depth, type_stack_size;
+
+static void push_type ();
+static enum type_pieces pop_type ();
+
+/* Allow debugging of parsing. */
+#define YYDEBUG 1
+%}
+
+/* Although the yacc "value" of an expression is not used,
+ since the result is stored in the structure being created,
+ other node types do have values. */
+
+%union
+ {
+ LONGEST lval;
+ unsigned LONGEST ulval;
+ double dval;
+ struct symbol *sym;
+ struct type *tval;
+ struct stoken sval;
+ int voidval;
+ struct block *bval;
+ enum exp_opcode opcode;
+ struct internalvar *ivar;
+
+ struct type **tvec;
+ int *ivec;
+ }
+
+%type <voidval> exp exp1 start variable
+%type <tval> type typebase
+%type <tvec> nonempty_typelist
+%type <bval> block
+
+/* Fancy type parsing. */
+%type <voidval> func_mod direct_abs_decl abs_decl
+%type <tval> ptype
+%type <lval> array_mod
+
+%token <lval> INT CHAR
+%token <ulval> UINT
+%token <dval> FLOAT
+
+/* Both NAME and TYPENAME tokens represent symbols in the input,
+ and both convey their data as strings.
+ But a TYPENAME is a string that happens to be defined as a typedef
+ or builtin type name (such as int or char)
+ and a NAME is any other symbol.
+
+ Contexts where this distinction is not important can use the
+ nonterminal "name", which matches either NAME or TYPENAME. */
+
+%token <sval> NAME TYPENAME BLOCKNAME STRING
+%type <sval> name name_not_typename typename
+
+%token STRUCT UNION ENUM SIZEOF UNSIGNED COLONCOLON
+
+/* Special type cases, put in to allow the parser to distinguish different
+ legal basetypes. */
+%token SIGNED LONG SHORT INT_KEYWORD
+
+%token <lval> LAST REGNAME
+
+%token <ivar> VARIABLE
+
+%token <opcode> ASSIGN_MODIFY
+
+/* C++ */
+%token THIS
+
+%left ','
+%left ABOVE_COMMA
+%right '=' ASSIGN_MODIFY
+%right '?'
+%left OR
+%left AND
+%left '|'
+%left '^'
+%left '&'
+%left EQUAL NOTEQUAL
+%left '<' '>' LEQ GEQ
+%left LSH RSH
+%left '@'
+%left '+' '-'
+%left '*' '/' '%'
+%right UNARY INCREMENT DECREMENT
+%right ARROW '.' '[' '('
+%left COLONCOLON
+\f
+%%
+
+start : exp1
+ ;
+
+/* Expressions, including the comma operator. */
+exp1 : exp
+ | exp1 ',' exp
+ { write_exp_elt_opcode (BINOP_COMMA); }
+ ;
+
+/* Expressions, not including the comma operator. */
+exp : '*' exp %prec UNARY
+ { write_exp_elt_opcode (UNOP_IND); }
+
+exp : '&' exp %prec UNARY
+ { write_exp_elt_opcode (UNOP_ADDR); }
+
+exp : '-' exp %prec UNARY
+ { write_exp_elt_opcode (UNOP_NEG); }
+ ;
+
+exp : '!' exp %prec UNARY
+ { write_exp_elt_opcode (UNOP_ZEROP); }
+ ;
+
+exp : '~' exp %prec UNARY
+ { write_exp_elt_opcode (UNOP_LOGNOT); }
+ ;
+
+exp : INCREMENT exp %prec UNARY
+ { write_exp_elt_opcode (UNOP_PREINCREMENT); }
+ ;
+
+exp : DECREMENT exp %prec UNARY
+ { write_exp_elt_opcode (UNOP_PREDECREMENT); }
+ ;
+
+exp : exp INCREMENT %prec UNARY
+ { write_exp_elt_opcode (UNOP_POSTINCREMENT); }
+ ;
+
+exp : exp DECREMENT %prec UNARY
+ { write_exp_elt_opcode (UNOP_POSTDECREMENT); }
+ ;
+
+exp : SIZEOF exp %prec UNARY
+ { write_exp_elt_opcode (UNOP_SIZEOF); }
+ ;
+
+exp : exp ARROW name
+ { write_exp_elt_opcode (STRUCTOP_PTR);
+ write_exp_string ($3);
+ write_exp_elt_opcode (STRUCTOP_PTR); }
+ ;
+
+exp : exp ARROW '*' exp
+ { write_exp_elt_opcode (STRUCTOP_MPTR); }
+ ;
+
+exp : exp '.' name
+ { write_exp_elt_opcode (STRUCTOP_STRUCT);
+ write_exp_string ($3);
+ write_exp_elt_opcode (STRUCTOP_STRUCT); }
+ ;
+
+exp : exp '.' '*' exp
+ { write_exp_elt_opcode (STRUCTOP_MEMBER); }
+ ;
+
+exp : exp '[' exp1 ']'
+ { write_exp_elt_opcode (BINOP_SUBSCRIPT); }
+ ;
+
+exp : exp '('
+ /* This is to save the value of arglist_len
+ being accumulated by an outer function call. */
+ { start_arglist (); }
+ arglist ')' %prec ARROW
+ { write_exp_elt_opcode (OP_FUNCALL);
+ write_exp_elt_longcst ((LONGEST) end_arglist ());
+ write_exp_elt_opcode (OP_FUNCALL); }
+ ;
+
+arglist :
+ ;
+
+arglist : exp
+ { arglist_len = 1; }
+ ;
+
+arglist : arglist ',' exp %prec ABOVE_COMMA
+ { arglist_len++; }
+ ;
+
+exp : '{' type '}' exp %prec UNARY
+ { write_exp_elt_opcode (UNOP_MEMVAL);
+ write_exp_elt_type ($2);
+ write_exp_elt_opcode (UNOP_MEMVAL); }
+ ;
+
+exp : '(' type ')' exp %prec UNARY
+ { write_exp_elt_opcode (UNOP_CAST);
+ write_exp_elt_type ($2);
+ write_exp_elt_opcode (UNOP_CAST); }
+ ;
+
+exp : '(' exp1 ')'
+ { }
+ ;
+
+/* Binary operators in order of decreasing precedence. */
+
+exp : exp '@' exp
+ { write_exp_elt_opcode (BINOP_REPEAT); }
+ ;
+
+exp : exp '*' exp
+ { write_exp_elt_opcode (BINOP_MUL); }
+ ;
+
+exp : exp '/' exp
+ { write_exp_elt_opcode (BINOP_DIV); }
+ ;
+
+exp : exp '%' exp
+ { write_exp_elt_opcode (BINOP_REM); }
+ ;
+
+exp : exp '+' exp
+ { write_exp_elt_opcode (BINOP_ADD); }
+ ;
+
+exp : exp '-' exp
+ { write_exp_elt_opcode (BINOP_SUB); }
+ ;
+
+exp : exp LSH exp
+ { write_exp_elt_opcode (BINOP_LSH); }
+ ;
+
+exp : exp RSH exp
+ { write_exp_elt_opcode (BINOP_RSH); }
+ ;
+
+exp : exp EQUAL exp
+ { write_exp_elt_opcode (BINOP_EQUAL); }
+ ;
+
+exp : exp NOTEQUAL exp
+ { write_exp_elt_opcode (BINOP_NOTEQUAL); }
+ ;
+
+exp : exp LEQ exp
+ { write_exp_elt_opcode (BINOP_LEQ); }
+ ;
+
+exp : exp GEQ exp
+ { write_exp_elt_opcode (BINOP_GEQ); }
+ ;
+
+exp : exp '<' exp
+ { write_exp_elt_opcode (BINOP_LESS); }
+ ;
+
+exp : exp '>' exp
+ { write_exp_elt_opcode (BINOP_GTR); }
+ ;
+
+exp : exp '&' exp
+ { write_exp_elt_opcode (BINOP_LOGAND); }
+ ;
+
+exp : exp '^' exp
+ { write_exp_elt_opcode (BINOP_LOGXOR); }
+ ;
+
+exp : exp '|' exp
+ { write_exp_elt_opcode (BINOP_LOGIOR); }
+ ;
+
+exp : exp AND exp
+ { write_exp_elt_opcode (BINOP_AND); }
+ ;
+
+exp : exp OR exp
+ { write_exp_elt_opcode (BINOP_OR); }
+ ;
+
+exp : exp '?' exp ':' exp %prec '?'
+ { write_exp_elt_opcode (TERNOP_COND); }
+ ;
+
+exp : exp '=' exp
+ { write_exp_elt_opcode (BINOP_ASSIGN); }
+ ;
+
+exp : exp ASSIGN_MODIFY exp
+ { write_exp_elt_opcode (BINOP_ASSIGN_MODIFY);
+ write_exp_elt_opcode ($2);
+ write_exp_elt_opcode (BINOP_ASSIGN_MODIFY); }
+ ;
+
+exp : INT
+ { write_exp_elt_opcode (OP_LONG);
+ if ($1 == (int) $1 || $1 == (unsigned int) $1)
+ write_exp_elt_type (builtin_type_int);
+ else
+ write_exp_elt_type (BUILTIN_TYPE_LONGEST);
+ write_exp_elt_longcst ((LONGEST) $1);
+ write_exp_elt_opcode (OP_LONG); }
+ ;
+
+exp : UINT
+ {
+ write_exp_elt_opcode (OP_LONG);
+ if ($1 == (unsigned int) $1)
+ write_exp_elt_type (builtin_type_unsigned_int);
+ else
+ write_exp_elt_type (BUILTIN_TYPE_UNSIGNED_LONGEST);
+ write_exp_elt_longcst ((LONGEST) $1);
+ write_exp_elt_opcode (OP_LONG);
+ }
+ ;
+
+exp : CHAR
+ { write_exp_elt_opcode (OP_LONG);
+ write_exp_elt_type (builtin_type_char);
+ write_exp_elt_longcst ((LONGEST) $1);
+ write_exp_elt_opcode (OP_LONG); }
+ ;
+
+exp : FLOAT
+ { write_exp_elt_opcode (OP_DOUBLE);
+ write_exp_elt_type (builtin_type_double);
+ write_exp_elt_dblcst ($1);
+ write_exp_elt_opcode (OP_DOUBLE); }
+ ;
+
+exp : variable
+ ;
+
+exp : LAST
+ { write_exp_elt_opcode (OP_LAST);
+ write_exp_elt_longcst ((LONGEST) $1);
+ write_exp_elt_opcode (OP_LAST); }
+ ;
+
+exp : REGNAME
+ { write_exp_elt_opcode (OP_REGISTER);
+ write_exp_elt_longcst ((LONGEST) $1);
+ write_exp_elt_opcode (OP_REGISTER); }
+ ;
+
+exp : VARIABLE
+ { write_exp_elt_opcode (OP_INTERNALVAR);
+ write_exp_elt_intern ($1);
+ write_exp_elt_opcode (OP_INTERNALVAR); }
+ ;
+
+exp : SIZEOF '(' type ')' %prec UNARY
+ { write_exp_elt_opcode (OP_LONG);
+ write_exp_elt_type (builtin_type_int);
+ write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
+ write_exp_elt_opcode (OP_LONG); }
+ ;
+
+exp : STRING
+ { write_exp_elt_opcode (OP_STRING);
+ write_exp_string ($1);
+ write_exp_elt_opcode (OP_STRING); }
+ ;
+
+/* C++. */
+exp : THIS
+ { write_exp_elt_opcode (OP_THIS);
+ write_exp_elt_opcode (OP_THIS); }
+ ;
+
+/* end of C++. */
+
+block : BLOCKNAME
+ {
+ struct symtab *tem = lookup_symtab (copy_name ($1));
+ struct symbol *sym;
+
+ if (tem)
+ $$ = BLOCKVECTOR_BLOCK (BLOCKVECTOR (tem), 1);
+ else
+ {
+ sym = lookup_symbol (copy_name ($1),
+ expression_context_block,
+ VAR_NAMESPACE, 0);
+ if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
+ $$ = SYMBOL_BLOCK_VALUE (sym);
+ else
+ error ("No file or function \"%s\".",
+ copy_name ($1));
+ }
+ }
+ ;
+
+block : block COLONCOLON name
+ { struct symbol *tem
+ = lookup_symbol (copy_name ($3), $1, VAR_NAMESPACE, 0);
+ if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
+ error ("No function \"%s\" in specified context.",
+ copy_name ($3));
+ $$ = SYMBOL_BLOCK_VALUE (tem); }
+ ;
+
+variable: block COLONCOLON name
+ { struct symbol *sym;
+ sym = lookup_symbol (copy_name ($3), $1, VAR_NAMESPACE, 0);
+ if (sym == 0)
+ error ("No symbol \"%s\" in specified context.",
+ copy_name ($3));
+ write_exp_elt_opcode (OP_VAR_VALUE);
+ write_exp_elt_sym (sym);
+ write_exp_elt_opcode (OP_VAR_VALUE); }
+ ;
+
+variable: typebase COLONCOLON name
+ {
+ struct type *type = $1;
+ if (TYPE_CODE (type) != TYPE_CODE_STRUCT
+ && TYPE_CODE (type) != TYPE_CODE_UNION)
+ error ("`%s' is not defined as an aggregate type.",
+ TYPE_NAME (type));
+
+ write_exp_elt_opcode (OP_SCOPE);
+ write_exp_elt_type (type);
+ write_exp_string ($3);
+ write_exp_elt_opcode (OP_SCOPE);
+ }
+ | COLONCOLON name
+ {
+ char *name = copy_name ($2);
+ struct symbol *sym;
+ int i;
+
+ sym = lookup_symbol (name, 0, VAR_NAMESPACE, 0);
+ if (sym)
+ {
+ write_exp_elt_opcode (OP_VAR_VALUE);
+ write_exp_elt_sym (sym);
+ write_exp_elt_opcode (OP_VAR_VALUE);
+ break;
+ }
+ for (i = 0; i < misc_function_count; i++)
+ if (!strcmp (misc_function_vector[i].name, name))
+ break;
+
+ if (i < misc_function_count)
+ {
+ enum misc_function_type mft =
+ (enum misc_function_type)
+ misc_function_vector[i].type;
+
+ write_exp_elt_opcode (OP_LONG);
+ write_exp_elt_type (builtin_type_int);
+ write_exp_elt_longcst ((LONGEST) misc_function_vector[i].address);
+ write_exp_elt_opcode (OP_LONG);
+ write_exp_elt_opcode (UNOP_MEMVAL);
+ if (mft == mf_data || mft == mf_bss)
+ write_exp_elt_type (builtin_type_int);
+ else if (mft == mf_text)
+ write_exp_elt_type (lookup_function_type (builtin_type_int));
+ else
+ write_exp_elt_type (builtin_type_char);
+ write_exp_elt_opcode (UNOP_MEMVAL);
+ }
+ else
+ if (symtab_list == 0
+ && partial_symtab_list == 0)
+ error ("No symbol table is loaded. Use the \"symbol-file\" command.");
+ else
+ error ("No symbol \"%s\" in current context.", name);
+ }
+ ;
+
+variable: name_not_typename
+ { struct symbol *sym;
+ int is_a_field_of_this;
+
+ sym = lookup_symbol (copy_name ($1),
+ expression_context_block,
+ VAR_NAMESPACE,
+ &is_a_field_of_this);
+ if (sym)
+ {
+ switch (sym->class)
+ {
+ case LOC_REGISTER:
+ case LOC_ARG:
+ case LOC_LOCAL:
+ if (innermost_block == 0 ||
+ contained_in (block_found,
+ innermost_block))
+ innermost_block = block_found;
+ }
+ write_exp_elt_opcode (OP_VAR_VALUE);
+ write_exp_elt_sym (sym);
+ write_exp_elt_opcode (OP_VAR_VALUE);
+ }
+ else if (is_a_field_of_this)
+ {
+ /* C++: it hangs off of `this'. Must
+ not inadvertently convert from a method call
+ to data ref. */
+ if (innermost_block == 0 ||
+ contained_in (block_found, innermost_block))
+ innermost_block = block_found;
+ write_exp_elt_opcode (OP_THIS);
+ write_exp_elt_opcode (OP_THIS);
+ write_exp_elt_opcode (STRUCTOP_PTR);
+ write_exp_string ($1);
+ write_exp_elt_opcode (STRUCTOP_PTR);
+ }
+ else
+ {
+ register int i;
+ register char *arg = copy_name ($1);
+
+ for (i = 0; i < misc_function_count; i++)
+ if (!strcmp (misc_function_vector[i].name, arg))
+ break;
+
+ if (i < misc_function_count)
+ {
+ enum misc_function_type mft =
+ (enum misc_function_type)
+ misc_function_vector[i].type;
+
+ write_exp_elt_opcode (OP_LONG);
+ write_exp_elt_type (builtin_type_int);
+ write_exp_elt_longcst ((LONGEST) misc_function_vector[i].address);
+ write_exp_elt_opcode (OP_LONG);
+ write_exp_elt_opcode (UNOP_MEMVAL);
+ if (mft == mf_data || mft == mf_bss)
+ write_exp_elt_type (builtin_type_int);
+ else if (mft == mf_text)
+ write_exp_elt_type (lookup_function_type (builtin_type_int));
+ else
+ write_exp_elt_type (builtin_type_char);
+ write_exp_elt_opcode (UNOP_MEMVAL);
+ }
+ else if (symtab_list == 0
+ && partial_symtab_list == 0)
+ error ("No symbol table is loaded. Use the \"symbol-file\" command.");
+ else
+ error ("No symbol \"%s\" in current context.",
+ copy_name ($1));
+ }
+ }
+ ;
+
+
+ptype : typebase
+ | typebase abs_decl
+ {
+ /* This is where the interesting stuff happens. */
+ int done = 0;
+ int array_size;
+ struct type *follow_type = $1;
+
+ while (!done)
+ switch (pop_type ())
+ {
+ case tp_end:
+ done = 1;
+ break;
+ case tp_pointer:
+ follow_type = lookup_pointer_type (follow_type);
+ break;
+ case tp_reference:
+ follow_type = lookup_reference_type (follow_type);
+ break;
+ case tp_array:
+ array_size = (int) pop_type ();
+ if (array_size != -1)
+ follow_type = create_array_type (follow_type,
+ array_size);
+ else
+ follow_type = lookup_pointer_type (follow_type);
+ break;
+ case tp_function:
+ follow_type = lookup_function_type (follow_type);
+ break;
+ }
+ $$ = follow_type;
+ }
+ ;
+
+abs_decl: '*'
+ { push_type (tp_pointer); $$ = 0; }
+ | '*' abs_decl
+ { push_type (tp_pointer); $$ = $2; }
+ | direct_abs_decl
+ ;
+
+direct_abs_decl: '(' abs_decl ')'
+ { $$ = $2; }
+ | direct_abs_decl array_mod
+ {
+ push_type ((enum type_pieces) $2);
+ push_type (tp_array);
+ }
+ | array_mod
+ {
+ push_type ((enum type_pieces) $1);
+ push_type (tp_array);
+ $$ = 0;
+ }
+ | direct_abs_decl func_mod
+ { push_type (tp_function); }
+ | func_mod
+ { push_type (tp_function); }
+ ;
+
+array_mod: '[' ']'
+ { $$ = -1; }
+ | '[' INT ']'
+ { $$ = $2; }
+ ;
+
+func_mod: '(' ')'
+ { $$ = 0; }
+ ;
+
+type : ptype
+ | typebase COLONCOLON '*'
+ { $$ = lookup_member_type (builtin_type_int, $1); }
+ | type '(' typebase COLONCOLON '*' ')'
+ { $$ = lookup_member_type ($1, $3); }
+ | type '(' typebase COLONCOLON '*' ')' '(' ')'
+ { $$ = lookup_member_type
+ (lookup_function_type ($1), $3); }
+ | type '(' typebase COLONCOLON '*' ')' '(' nonempty_typelist ')'
+ { $$ = lookup_member_type
+ (lookup_function_type ($1), $3);
+ free ($8); }
+ ;
+
+typebase
+ : TYPENAME
+ { $$ = lookup_typename (copy_name ($1),
+ expression_context_block, 0); }
+ | INT_KEYWORD
+ { $$ = builtin_type_int; }
+ | LONG
+ { $$ = builtin_type_long; }
+ | SHORT
+ { $$ = builtin_type_short; }
+ | LONG INT_KEYWORD
+ { $$ = builtin_type_long; }
+ | UNSIGNED LONG INT_KEYWORD
+ { $$ = builtin_type_unsigned_long; }
+ | SHORT INT_KEYWORD
+ { $$ = builtin_type_short; }
+ | UNSIGNED SHORT INT_KEYWORD
+ { $$ = builtin_type_unsigned_short; }
+ | STRUCT name
+ { $$ = lookup_struct (copy_name ($2),
+ expression_context_block); }
+ | UNION name
+ { $$ = lookup_union (copy_name ($2),
+ expression_context_block); }
+ | ENUM name
+ { $$ = lookup_enum (copy_name ($2),
+ expression_context_block); }
+ | UNSIGNED typename
+ { $$ = lookup_unsigned_typename (copy_name ($2)); }
+ | UNSIGNED
+ { $$ = builtin_type_unsigned_int; }
+ | SIGNED typename
+ { $$ = lookup_typename (copy_name ($2),
+ expression_context_block, 0); }
+ | SIGNED
+ { $$ = builtin_type_int; }
+ ;
+
+typename: TYPENAME
+ | INT_KEYWORD
+ {
+ $$.ptr = "int";
+ $$.length = 3;
+ }
+ | LONG
+ {
+ $$.ptr = "long";
+ $$.length = 4;
+ }
+ | SHORT
+ {
+ $$.ptr = "short";
+ $$.length = 5;
+ }
+ ;
+
+nonempty_typelist
+ : type
+ { $$ = (struct type **)xmalloc (sizeof (struct type *) * 2);
+ $$[0] = (struct type *)0;
+ $$[1] = $1;
+ }
+ | nonempty_typelist ',' type
+ { int len = sizeof (struct type *) * ++($<ivec>1[0]);
+ $$ = (struct type **)xrealloc ($1, len);
+ $$[$<ivec>$[0]] = $3;
+ }
+ ;
+
+name : NAME
+ | BLOCKNAME
+ | TYPENAME
+ ;
+
+name_not_typename : NAME
+ | BLOCKNAME
+ ;
+
+%%
+\f
+/* Begin counting arguments for a function call,
+ saving the data about any containing call. */
+
+static void
+start_arglist ()
+{
+ register struct funcall *new = (struct funcall *) xmalloc (sizeof (struct funcall));
+
+ new->next = funcall_chain;
+ new->arglist_len = arglist_len;
+ arglist_len = 0;
+ funcall_chain = new;
+}
+
+/* Return the number of arguments in a function call just terminated,
+ and restore the data for the containing function call. */
+
+static int
+end_arglist ()
+{
+ register int val = arglist_len;
+ register struct funcall *call = funcall_chain;
+ funcall_chain = call->next;
+ arglist_len = call->arglist_len;
+ free (call);
+ return val;
+}
+
+/* Free everything in the funcall chain.
+ Used when there is an error inside parsing. */
+
+static void
+free_funcalls ()
+{
+ register struct funcall *call, *next;
+
+ for (call = funcall_chain; call; call = next)
+ {
+ next = call->next;
+ free (call);
+ }
+}
+\f
+/* This page contains the functions for adding data to the struct expression
+ being constructed. */
+
+/* Add one element to the end of the expression. */
+
+/* To avoid a bug in the Sun 4 compiler, we pass things that can fit into
+ a register through here */
+
+static void
+write_exp_elt (expelt)
+ union exp_element expelt;
+{
+ if (expout_ptr >= expout_size)
+ {
+ expout_size *= 2;
+ expout = (struct expression *) xrealloc (expout,
+ sizeof (struct expression)
+ + expout_size * sizeof (union exp_element));
+ }
+ expout->elts[expout_ptr++] = expelt;
+}
+
+static void
+write_exp_elt_opcode (expelt)
+ enum exp_opcode expelt;
+{
+ union exp_element tmp;
+
+ tmp.opcode = expelt;
+
+ write_exp_elt (tmp);
+}
+
+static void
+write_exp_elt_sym (expelt)
+ struct symbol *expelt;
+{
+ union exp_element tmp;
+
+ tmp.symbol = expelt;
+
+ write_exp_elt (tmp);
+}
+
+static void
+write_exp_elt_longcst (expelt)
+ LONGEST expelt;
+{
+ union exp_element tmp;
+
+ tmp.longconst = expelt;
+
+ write_exp_elt (tmp);
+}
+
+static void
+write_exp_elt_dblcst (expelt)
+ double expelt;
+{
+ union exp_element tmp;
+
+ tmp.doubleconst = expelt;
+
+ write_exp_elt (tmp);
+}
+
+static void
+write_exp_elt_type (expelt)
+ struct type *expelt;
+{
+ union exp_element tmp;
+
+ tmp.type = expelt;
+
+ write_exp_elt (tmp);
+}
+
+static void
+write_exp_elt_intern (expelt)
+ struct internalvar *expelt;
+{
+ union exp_element tmp;
+
+ tmp.internalvar = expelt;
+
+ write_exp_elt (tmp);
+}
+
+/* Add a string constant to the end of the expression.
+ Follow it by its length in bytes, as a separate exp_element. */
+
+static void
+write_exp_string (str)
+ struct stoken str;
+{
+ register int len = str.length;
+ register int lenelt
+ = (len + sizeof (union exp_element)) / sizeof (union exp_element);
+
+ expout_ptr += lenelt;
+
+ if (expout_ptr >= expout_size)
+ {
+ expout_size = max (expout_size * 2, expout_ptr + 10);
+ expout = (struct expression *)
+ xrealloc (expout, (sizeof (struct expression)
+ + (expout_size * sizeof (union exp_element))));
+ }
+ bcopy (str.ptr, (char *) &expout->elts[expout_ptr - lenelt], len);
+ ((char *) &expout->elts[expout_ptr - lenelt])[len] = 0;
+ write_exp_elt_longcst ((LONGEST) len);
+}
+\f
+/* During parsing of a C expression, the pointer to the next character
+ is in this variable. */
+
+static char *lexptr;
+
+/* Tokens that refer to names do so with explicit pointer and length,
+ so they can share the storage that lexptr is parsing.
+
+ When it is necessary to pass a name to a function that expects
+ a null-terminated string, the substring is copied out
+ into a block of storage that namecopy points to.
+
+ namecopy is allocated once, guaranteed big enough, for each parsing. */
+
+static char *namecopy;
+
+/* Current depth in parentheses within the expression. */
+
+static int paren_depth;
+
+/* Nonzero means stop parsing on first comma (if not within parentheses). */
+
+static int comma_terminates;
+
+/* Take care of parsing a number (anything that starts with a digit).
+ Set yylval and return the token type; update lexptr.
+ LEN is the number of characters in it. */
+
+/*** Needs some error checking for the float case ***/
+
+static int
+parse_number (olen)
+ int olen;
+{
+ register char *p = lexptr;
+ register LONGEST n = 0;
+ register int c;
+ register int base = 10;
+ register int len = olen;
+ char *err_copy;
+ int unsigned_p = 0;
+
+ extern double atof ();
+
+ for (c = 0; c < len; c++)
+ if (p[c] == '.')
+ {
+ /* It's a float since it contains a point. */
+ yylval.dval = atof (p);
+ lexptr += len;
+ return FLOAT;
+ }
+
+ if (len >= 3 && (!strncmp (p, "0x", 2) || !strncmp (p, "0X", 2)))
+ {
+ p += 2;
+ base = 16;
+ len -= 2;
+ }
+ else if (*p == '0')
+ base = 8;
+
+ while (len-- > 0)
+ {
+ c = *p++;
+ if (c >= 'A' && c <= 'Z') c += 'a' - 'A';
+ if (c != 'l' && c != 'u')
+ n *= base;
+ if (c >= '0' && c <= '9')
+ n += c - '0';
+ else
+ {
+ if (base == 16 && c >= 'a' && c <= 'f')
+ n += c - 'a' + 10;
+ else if (len == 0 && c == 'l')
+ ;
+ else if (len == 0 && c == 'u')
+ unsigned_p = 1;
+ else if (base == 10 && len != 0 && (c == 'e' || c == 'E'))
+ {
+ /* Scientific notation, where we are unlucky enough not
+ to have a '.' in the string. */
+ yylval.dval = atof (lexptr);
+ lexptr += olen;
+ return FLOAT;
+ }
+ else
+ {
+ err_copy = (char *) alloca (olen + 1);
+ bcopy (lexptr, err_copy, olen);
+ err_copy[olen] = 0;
+ error ("Invalid number \"%s\".", err_copy);
+ }
+ }
+ }
+
+ lexptr = p;
+ if (unsigned_p)
+ {
+ yylval.ulval = n;
+ return UINT;
+ }
+ else
+ {
+ yylval.lval = n;
+ return INT;
+ }
+}
+
+struct token
+{
+ char *operator;
+ int token;
+ enum exp_opcode opcode;
+};
+
+static struct token tokentab3[] =
+ {
+ {">>=", ASSIGN_MODIFY, BINOP_RSH},
+ {"<<=", ASSIGN_MODIFY, BINOP_LSH}
+ };
+
+static struct token tokentab2[] =
+ {
+ {"+=", ASSIGN_MODIFY, BINOP_ADD},
+ {"-=", ASSIGN_MODIFY, BINOP_SUB},
+ {"*=", ASSIGN_MODIFY, BINOP_MUL},
+ {"/=", ASSIGN_MODIFY, BINOP_DIV},
+ {"%=", ASSIGN_MODIFY, BINOP_REM},
+ {"|=", ASSIGN_MODIFY, BINOP_LOGIOR},
+ {"&=", ASSIGN_MODIFY, BINOP_LOGAND},
+ {"^=", ASSIGN_MODIFY, BINOP_LOGXOR},
+ {"++", INCREMENT, BINOP_END},
+ {"--", DECREMENT, BINOP_END},
+ {"->", ARROW, BINOP_END},
+ {"&&", AND, BINOP_END},
+ {"||", OR, BINOP_END},
+ {"::", COLONCOLON, BINOP_END},
+ {"<<", LSH, BINOP_END},
+ {">>", RSH, BINOP_END},
+ {"==", EQUAL, BINOP_END},
+ {"!=", NOTEQUAL, BINOP_END},
+ {"<=", LEQ, BINOP_END},
+ {">=", GEQ, BINOP_END}
+ };
+
+/* assign machine-independent names to certain registers
+ * (unless overridden by the REGISTER_NAMES table)
+ */
+struct std_regs {
+ char *name;
+ int regnum;
+} std_regs[] = {
+#ifdef PC_REGNUM
+ { "pc", PC_REGNUM },
+#endif
+#ifdef FP_REGNUM
+ { "fp", FP_REGNUM },
+#endif
+#ifdef SP_REGNUM
+ { "sp", SP_REGNUM },
+#endif
+#ifdef PS_REGNUM
+ { "ps", PS_REGNUM },
+#endif
+};
+
+#define NUM_STD_REGS (sizeof std_regs / sizeof std_regs[0])
+
+/* Read one token, getting characters through lexptr. */
+
+static int
+yylex ()
+{
+ register int c;
+ register int namelen;
+ register int i;
+ register char *tokstart;
+
+ retry:
+
+ tokstart = lexptr;
+ /* See if it is a special token of length 3. */
+ for (i = 0; i < sizeof tokentab3 / sizeof tokentab3[0]; i++)
+ if (!strncmp (tokstart, tokentab3[i].operator, 3))
+ {
+ lexptr += 3;
+ yylval.opcode = tokentab3[i].opcode;
+ return tokentab3[i].token;
+ }
+
+ /* See if it is a special token of length 2. */
+ for (i = 0; i < sizeof tokentab2 / sizeof tokentab2[0]; i++)
+ if (!strncmp (tokstart, tokentab2[i].operator, 2))
+ {
+ lexptr += 2;
+ yylval.opcode = tokentab2[i].opcode;
+ return tokentab2[i].token;
+ }
+
+ switch (c = *tokstart)
+ {
+ case 0:
+ return 0;
+
+ case ' ':
+ case '\t':
+ case '\n':
+ lexptr++;
+ goto retry;
+
+ case '\'':
+ lexptr++;
+ c = *lexptr++;
+ if (c == '\\')
+ c = parse_escape (&lexptr);
+ yylval.lval = c;
+ c = *lexptr++;
+ if (c != '\'')
+ error ("Invalid character constant.");
+ return CHAR;
+
+ case '(':
+ paren_depth++;
+ lexptr++;
+ return c;
+
+ case ')':
+ if (paren_depth == 0)
+ return 0;
+ paren_depth--;
+ lexptr++;
+ return c;
+
+ case ',':
+ if (comma_terminates && paren_depth == 0)
+ return 0;
+ lexptr++;
+ return c;
+
+ case '.':
+ /* Might be a floating point number. */
+ if (lexptr[1] >= '0' && lexptr[1] <= '9')
+ break; /* Falls into number code. */
+
+ case '+':
+ case '-':
+ case '*':
+ case '/':
+ case '%':
+ case '|':
+ case '&':
+ case '^':
+ case '~':
+ case '!':
+ case '@':
+ case '<':
+ case '>':
+ case '[':
+ case ']':
+ case '?':
+ case ':':
+ case '=':
+ case '{':
+ case '}':
+ lexptr++;
+ return c;
+
+ case '"':
+ for (namelen = 1; (c = tokstart[namelen]) != '"'; namelen++)
+ if (c == '\\')
+ {
+ c = tokstart[++namelen];
+ if (c >= '0' && c <= '9')
+ {
+ c = tokstart[++namelen];
+ if (c >= '0' && c <= '9')
+ c = tokstart[++namelen];
+ }
+ }
+ yylval.sval.ptr = tokstart + 1;
+ yylval.sval.length = namelen - 1;
+ lexptr += namelen + 1;
+ return STRING;
+ }
+
+ /* Is it a number? */
+ /* Note: We have already dealt with the case of the token '.'.
+ See case '.' above. */
+ if ((c >= '0' && c <= '9') || c == '.')
+ {
+ /* It's a number. */
+ int got_dot = 0, got_e = 0;
+ register char *p = tokstart;
+ int hex = c == '0' && (p[1] == 'x' || p[1] == 'X');
+ if (hex)
+ p += 2;
+ for (;; ++p)
+ {
+ if (!hex && !got_e && (*p == 'e' || *p == 'E'))
+ got_dot = got_e = 1;
+ else if (!hex && !got_dot && *p == '.')
+ got_dot = 1;
+ else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
+ && (*p == '-' || *p == '+'))
+ /* This is the sign of the exponent, not the end of the
+ number. */
+ continue;
+ else if (!got_dot && !got_e && (*p=='l'||*p=='L')){
+ ++p; break;
+ }
+ else if (!got_dot && !got_e && !hex && (*p=='u'||*p=='U')){
+ ++p; break;
+ }
+ else if (*p < '0' || *p > '9'
+ && (!hex || ((*p < 'a' || *p > 'f')
+ && (*p < 'A' || *p > 'F'))))
+ break;
+ }
+ return parse_number (p - tokstart);
+ }
+
+ if (!(c == '_' || c == '$'
+ || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
+ /* We must have come across a bad character (e.g. ';'). */
+ error ("Invalid character '%c' in expression.", c);
+
+ /* It's a name. See how long it is. */
+ namelen = 0;
+ for (c = tokstart[namelen];
+ (c == '_' || c == '$' || (c >= '0' && c <= '9')
+ || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'));
+ c = tokstart[++namelen])
+ ;
+
+ /* The token "if" terminates the expression and is NOT
+ removed from the input stream. */
+ if (namelen == 2 && tokstart[0] == 'i' && tokstart[1] == 'f')
+ {
+ return 0;
+ }
+
+ lexptr += namelen;
+
+ /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1)
+ and $$digits (equivalent to $<-digits> if you could type that).
+ Make token type LAST, and put the number (the digits) in yylval. */
+
+ if (*tokstart == '$')
+ {
+ register int negate = 0;
+ c = 1;
+ /* Double dollar means negate the number and add -1 as well.
+ Thus $$ alone means -1. */
+ if (namelen >= 2 && tokstart[1] == '$')
+ {
+ negate = 1;
+ c = 2;
+ }
+ if (c == namelen)
+ {
+ /* Just dollars (one or two) */
+ yylval.lval = - negate;
+ return LAST;
+ }
+ /* Is the rest of the token digits? */
+ for (; c < namelen; c++)
+ if (!(tokstart[c] >= '0' && tokstart[c] <= '9'))
+ break;
+ if (c == namelen)
+ {
+ yylval.lval = atoi (tokstart + 1 + negate);
+ if (negate)
+ yylval.lval = - yylval.lval;
+ return LAST;
+ }
+ }
+
+ /* Handle tokens that refer to machine registers:
+ $ followed by a register name. */
+
+ if (*tokstart == '$') {
+ for (c = 0; c < NUM_REGS; c++)
+ if (namelen - 1 == strlen (reg_names[c])
+ && !strncmp (tokstart + 1, reg_names[c], namelen - 1))
+ {
+ yylval.lval = c;
+ return REGNAME;
+ }
+ for (c = 0; c < NUM_STD_REGS; c++)
+ if (namelen - 1 == strlen (std_regs[c].name)
+ && !strncmp (tokstart + 1, std_regs[c].name, namelen - 1))
+ {
+ yylval.lval = std_regs[c].regnum;
+ return REGNAME;
+ }
+ }
+ /* Catch specific keywords. Should be done with a data structure. */
+ switch (namelen)
+ {
+ case 8:
+ if (!strncmp (tokstart, "unsigned", 8))
+ return UNSIGNED;
+ break;
+ case 6:
+ if (!strncmp (tokstart, "struct", 6))
+ return STRUCT;
+ if (!strncmp (tokstart, "signed", 6))
+ return SIGNED;
+ if (!strncmp (tokstart, "sizeof", 6))
+ return SIZEOF;
+ break;
+ case 5:
+ if (!strncmp (tokstart, "union", 5))
+ return UNION;
+ if (!strncmp (tokstart, "short", 5))
+ return SHORT;
+ break;
+ case 4:
+ if (!strncmp (tokstart, "enum", 4))
+ return ENUM;
+ if (!strncmp (tokstart, "long", 4))
+ return LONG;
+ if (!strncmp (tokstart, "this", 4)
+ && lookup_symbol ("$this", expression_context_block,
+ VAR_NAMESPACE, 0))
+ return THIS;
+ break;
+ case 3:
+ if (!strncmp (tokstart, "int", 3))
+ return INT_KEYWORD;
+ break;
+ default:
+ break;
+ }
+
+ yylval.sval.ptr = tokstart;
+ yylval.sval.length = namelen;
+
+ /* Any other names starting in $ are debugger internal variables. */
+
+ if (*tokstart == '$')
+ {
+ yylval.ivar = (struct internalvar *) lookup_internalvar (copy_name (yylval.sval) + 1);
+ return VARIABLE;
+ }
+
+ /* Use token-type BLOCKNAME for symbols that happen to be defined as
+ functions or symtabs. If this is not so, then ...
+ Use token-type TYPENAME for symbols that happen to be defined
+ currently as names of types; NAME for other symbols.
+ The caller is not constrained to care about the distinction. */
+ {
+ char *tmp = copy_name (yylval.sval);
+ struct symbol *sym;
+
+ if (lookup_partial_symtab (tmp))
+ return BLOCKNAME;
+ sym = lookup_symbol (tmp, expression_context_block,
+ VAR_NAMESPACE, 0);
+ if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
+ return BLOCKNAME;
+ if (lookup_typename (copy_name (yylval.sval), expression_context_block, 1))
+ return TYPENAME;
+ return NAME;
+ }
+}
+
+static void
+yyerror ()
+{
+ error ("Invalid syntax in expression.");
+}
+
+/* Return a null-terminated temporary copy of the name
+ of a string token. */
+
+static char *
+copy_name (token)
+ struct stoken token;
+{
+ bcopy (token.ptr, namecopy, token.length);
+ namecopy[token.length] = 0;
+ return namecopy;
+}
+\f
+/* Reverse an expression from suffix form (in which it is constructed)
+ to prefix form (in which we can conveniently print or execute it). */
+
+static void prefixify_subexp ();
+
+static void
+prefixify_expression (expr)
+ register struct expression *expr;
+{
+ register int len = sizeof (struct expression) +
+ expr->nelts * sizeof (union exp_element);
+ register struct expression *temp;
+ register int inpos = expr->nelts, outpos = 0;
+
+ temp = (struct expression *) alloca (len);
+
+ /* Copy the original expression into temp. */
+ bcopy (expr, temp, len);
+
+ prefixify_subexp (temp, expr, inpos, outpos);
+}
+
+/* Return the number of exp_elements in the subexpression of EXPR
+ whose last exp_element is at index ENDPOS - 1 in EXPR. */
+
+static int
+length_of_subexp (expr, endpos)
+ register struct expression *expr;
+ register int endpos;
+{
+ register int oplen = 1;
+ register int args = 0;
+ register int i;
+
+ if (endpos < 0)
+ error ("?error in length_of_subexp");
+
+ i = (int) expr->elts[endpos - 1].opcode;
+
+ switch (i)
+ {
+ /* C++ */
+ case OP_SCOPE:
+ oplen = 4 + ((expr->elts[endpos - 2].longconst
+ + sizeof (union exp_element))
+ / sizeof (union exp_element));
+ break;
+
+ case OP_LONG:
+ case OP_DOUBLE:
+ oplen = 4;
+ break;
+
+ case OP_VAR_VALUE:
+ case OP_LAST:
+ case OP_REGISTER:
+ case OP_INTERNALVAR:
+ oplen = 3;
+ break;
+
+ case OP_FUNCALL:
+ oplen = 3;
+ args = 1 + expr->elts[endpos - 2].longconst;
+ break;
+
+ case UNOP_CAST:
+ case UNOP_MEMVAL:
+ oplen = 3;
+ args = 1;
+ break;
+
+ case STRUCTOP_STRUCT:
+ case STRUCTOP_PTR:
+ args = 1;
+ case OP_STRING:
+ oplen = 3 + ((expr->elts[endpos - 2].longconst
+ + sizeof (union exp_element))
+ / sizeof (union exp_element));
+ break;
+
+ case TERNOP_COND:
+ args = 3;
+ break;
+
+ case BINOP_ASSIGN_MODIFY:
+ oplen = 3;
+ args = 2;
+ break;
+
+ /* C++ */
+ case OP_THIS:
+ oplen = 2;
+ break;
+
+ default:
+ args = 1 + (i < (int) BINOP_END);
+ }
+
+ while (args > 0)
+ {
+ oplen += length_of_subexp (expr, endpos - oplen);
+ args--;
+ }
+
+ return oplen;
+}
+
+/* Copy the subexpression ending just before index INEND in INEXPR
+ into OUTEXPR, starting at index OUTBEG.
+ In the process, convert it from suffix to prefix form. */
+
+static void
+prefixify_subexp (inexpr, outexpr, inend, outbeg)
+ register struct expression *inexpr;
+ struct expression *outexpr;
+ register int inend;
+ int outbeg;
+{
+ register int oplen = 1;
+ register int args = 0;
+ register int i;
+ int *arglens;
+ enum exp_opcode opcode;
+
+ /* Compute how long the last operation is (in OPLEN),
+ and also how many preceding subexpressions serve as
+ arguments for it (in ARGS). */
+
+ opcode = inexpr->elts[inend - 1].opcode;
+ switch (opcode)
+ {
+ /* C++ */
+ case OP_SCOPE:
+ oplen = 4 + ((inexpr->elts[inend - 2].longconst
+ + sizeof (union exp_element))
+ / sizeof (union exp_element));
+ break;
+
+ case OP_LONG:
+ case OP_DOUBLE:
+ oplen = 4;
+ break;
+
+ case OP_VAR_VALUE:
+ case OP_LAST:
+ case OP_REGISTER:
+ case OP_INTERNALVAR:
+ oplen = 3;
+ break;
+
+ case OP_FUNCALL:
+ oplen = 3;
+ args = 1 + inexpr->elts[inend - 2].longconst;
+ break;
+
+ case UNOP_CAST:
+ case UNOP_MEMVAL:
+ oplen = 3;
+ args = 1;
+ break;
+
+ case STRUCTOP_STRUCT:
+ case STRUCTOP_PTR:
+ args = 1;
+ case OP_STRING:
+ oplen = 3 + ((inexpr->elts[inend - 2].longconst
+ + sizeof (union exp_element))
+ / sizeof (union exp_element));
+
+ break;
+
+ case TERNOP_COND:
+ args = 3;
+ break;
+
+ case BINOP_ASSIGN_MODIFY:
+ oplen = 3;
+ args = 2;
+ break;
+
+ /* C++ */
+ case OP_THIS:
+ oplen = 2;
+ break;
+
+ default:
+ args = 1 + ((int) opcode < (int) BINOP_END);
+ }
+
+ /* Copy the final operator itself, from the end of the input
+ to the beginning of the output. */
+ inend -= oplen;
+ bcopy (&inexpr->elts[inend], &outexpr->elts[outbeg],
+ oplen * sizeof (union exp_element));
+ outbeg += oplen;
+
+ /* Find the lengths of the arg subexpressions. */
+ arglens = (int *) alloca (args * sizeof (int));
+ for (i = args - 1; i >= 0; i--)
+ {
+ oplen = length_of_subexp (inexpr, inend);
+ arglens[i] = oplen;
+ inend -= oplen;
+ }
+
+ /* Now copy each subexpression, preserving the order of
+ the subexpressions, but prefixifying each one.
+ In this loop, inend starts at the beginning of
+ the expression this level is working on
+ and marches forward over the arguments.
+ outbeg does similarly in the output. */
+ for (i = 0; i < args; i++)
+ {
+ oplen = arglens[i];
+ inend += oplen;
+ prefixify_subexp (inexpr, outexpr, inend, outbeg);
+ outbeg += oplen;
+ }
+}
+\f
+/* This page contains the two entry points to this file. */
+
+/* Read a C expression from the string *STRINGPTR points to,
+ parse it, and return a pointer to a struct expression that we malloc.
+ Use block BLOCK as the lexical context for variable names;
+ if BLOCK is zero, use the block of the selected stack frame.
+ Meanwhile, advance *STRINGPTR to point after the expression,
+ at the first nonwhite character that is not part of the expression
+ (possibly a null character).
+
+ If COMMA is nonzero, stop if a comma is reached. */
+
+struct expression *
+parse_c_1 (stringptr, block, comma)
+ char **stringptr;
+ struct block *block;
+{
+ struct cleanup *old_chain;
+
+ lexptr = *stringptr;
+
+ paren_depth = 0;
+ type_stack_depth = 0;
+
+ comma_terminates = comma;
+
+ if (lexptr == 0 || *lexptr == 0)
+ error_no_arg ("expression to compute");
+
+ old_chain = make_cleanup (free_funcalls, 0);
+ funcall_chain = 0;
+
+ expression_context_block = block ? block : get_selected_block ();
+
+ namecopy = (char *) alloca (strlen (lexptr) + 1);
+ expout_size = 10;
+ expout_ptr = 0;
+ expout = (struct expression *)
+ xmalloc (sizeof (struct expression)
+ + expout_size * sizeof (union exp_element));
+ make_cleanup (free_current_contents, &expout);
+ if (yyparse ())
+ yyerror ();
+ discard_cleanups (old_chain);
+ expout->nelts = expout_ptr;
+ expout = (struct expression *)
+ xrealloc (expout,
+ sizeof (struct expression)
+ + expout_ptr * sizeof (union exp_element));
+ prefixify_expression (expout);
+ *stringptr = lexptr;
+ return expout;
+}
+
+/* Parse STRING as an expression, and complain if this fails
+ to use up all of the contents of STRING. */
+
+struct expression *
+parse_c_expression (string)
+ char *string;
+{
+ register struct expression *exp;
+ exp = parse_c_1 (&string, 0, 0);
+ if (*string)
+ error ("Junk after end of expression.");
+ return exp;
+}
+
+static void
+push_type (tp)
+ enum type_pieces tp;
+{
+ if (type_stack_depth == type_stack_size)
+ {
+ type_stack_size *= 2;
+ type_stack = (enum type_pieces *)
+ xrealloc (type_stack, type_stack_size * sizeof (enum type_pieces));
+ }
+ type_stack[type_stack_depth++] = tp;
+}
+
+static enum type_pieces
+pop_type ()
+{
+ if (type_stack_depth)
+ return type_stack[--type_stack_depth];
+ return tp_end;
+}
+
+void
+_initialize_expread ()
+{
+ type_stack_size = 80;
+ type_stack_depth = 0;
+ type_stack = (enum type_pieces *)
+ xmalloc (type_stack_size * sizeof (enum type_pieces));
+}
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