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hyung-hwan 2005-06-23 04:55:44 +00:00
parent ad0c9a26dc
commit a5ec22d457
4 changed files with 460 additions and 113 deletions
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327
ase/stx/parser.c
View File

@ -1,5 +1,5 @@
/*
* $Id: parser.c,v 1.37 2005-06-22 15:02:41 bacon Exp $
* $Id: parser.c,v 1.38 2005-06-23 04:55:44 bacon Exp $
*/
#include <xp/stx/parser.h>
@ -16,15 +16,20 @@ static int __parse_keyword_pattern (xp_stx_parser_t* parser);
static int __parse_temporaries (xp_stx_parser_t* parser);
static int __parse_statements (xp_stx_parser_t* parser);
static int __parse_statements_2 (xp_stx_parser_t* parser);
static int __parse_statement (xp_stx_parser_t* parser);
static int __parse_expression (xp_stx_parser_t* parser);
static int __parse_assignment (
xp_stx_parser_t* parser, const xp_char_t* target);
static int __parse_basic_expression (
xp_stx_parser_t* parser, const xp_char_t* ident);
static int __parse_primary (
xp_stx_parser_t* parser, const xp_char_t* ident);
static int __parse_block_constructor (xp_stx_parser_t* parser);
static int __parse_message_continuation (xp_stx_parser_t* parser);
static int __parse_keyword_continuation (xp_stx_parser_t* parser);
static int __parse_binary_continuation (xp_stx_parser_t* parser);
static int __parse_unary_continuation (xp_stx_parser_t* parser);
static int __parse_keyword_message (xp_stx_parser_t* parser);
static int __parse_binary_message (xp_stx_parser_t* parser);
static int __parse_unary_message (xp_stx_parser_t* parser);
static int __emit_code (
xp_stx_parser_t* parser, const xp_char_t* high, const xp_char_t* low);
@ -132,6 +137,7 @@ const xp_char_t* xp_stx_parser_error_string (xp_stx_parser_t* parser)
XP_TEXT("invalid character"),
XP_TEXT("incomplete character literal"),
XP_TEXT("incomplete string literal"),
XP_TEXT("incomplete literal"),
XP_TEXT("message selector"),
XP_TEXT("invalid argument name"),
@ -139,9 +145,10 @@ const xp_char_t* xp_stx_parser_error_string (xp_stx_parser_t* parser)
XP_TEXT("temporary list not closed"),
XP_TEXT("too many temporaries"),
XP_TEXT("cannot redefine pseudo variable"),
XP_TEXT("invalid expression start"),
XP_TEXT("invalid primary/expression-start"),
XP_TEXT("no period at end of statement")
XP_TEXT("no period at end of statement"),
XP_TEXT("no closing parenthesis")
};
if (parser->error_code >= 0 &&
@ -377,20 +384,22 @@ static int __parse_temporaries (xp_stx_parser_t* parser)
static int __parse_statements (xp_stx_parser_t* parser)
{
/*
* <statements> ::= (TODO: this definition seems to be wrong)
* <statements> ::= (ORIGINAL->maybe wrong)
* (<return statement> ['.'] ) |
* (<expression> ['.' [<statements>]])
* <return statement> ::= returnOperator <expression>
* returnOperator ::= '^'
* <statements> ::= (REVISED->correct?)
* <statement> ['. [<statements>]]
*/
while (parser->token.type != XP_STX_TOKEN_END) {
if (__parse_statements_2 (parser) == -1) return -1;
if (__parse_statement (parser) == -1) return -1;
if (parser->token.type == XP_STX_TOKEN_PERIOD) {
GET_TOKEN (parser);
continue;
}
else if (parser->token.type != XP_STX_TOKEN_END) {
if (parser->token.type != XP_STX_TOKEN_END) {
parser->error_code = XP_STX_PARSER_ERROR_NO_PERIOD;
return -1;
}
@ -399,15 +408,21 @@ static int __parse_statements (xp_stx_parser_t* parser)
return 0;
}
static int __parse_statements_2 (xp_stx_parser_t* parser)
static int __parse_statement (xp_stx_parser_t* parser)
{
/*
* <statement> ::= <return statement> | <expression>
* <return statement> ::= returnOperator <expression>
* returnOperator ::= '^'
*/
if (parser->token.type == XP_STX_TOKEN_RETURN) {
GET_TOKEN (parser);
if (__parse_expression (parser) == -1) return -1;
/* TODO */
if (__parse_expression(parser) == -1) return -1;
EMIT_CODE (parser, XP_TEXT("RETURN"), XP_TEXT("stack top"));
}
else {
if (__parse_expression (parser) == -1) return -1;
if (__parse_expression(parser) == -1) return -1;
}
return 0;
@ -417,15 +432,14 @@ static int __parse_expression (xp_stx_parser_t* parser)
{
/*
* <expression> ::= <assignment> | <basic expression>
* <assignment> ::= <assignment target> assignmentOperator <expression>
* <assignment> ::= <assignment target> assignmentOperator <expression>
* <basic expression> ::= <primary> [<messages> <cascaded messages>]
* <assignment target> := identifier
* <assignment target> ::= identifier
* assignmentOperator ::= ':='
*/
if (parser->token.type == XP_STX_TOKEN_IDENT) {
xp_char_t* ident = xp_stx_token_yield (
&parser->token, parser->token.name.capacity);
xp_char_t* ident = xp_stx_token_yield (&parser->token, 0);
if (ident == XP_NULL) {
parser->error_code = XP_STX_PARSER_ERROR_MEMORY;
return -1;
@ -440,7 +454,7 @@ static int __parse_expression (xp_stx_parser_t* parser)
}
}
else {
if (__parse_message_continuation(parser) == -1) {
if (__parse_basic_expression(parser, ident) == -1) {
xp_free (ident);
return -1;
}
@ -449,91 +463,27 @@ static int __parse_expression (xp_stx_parser_t* parser)
xp_free (ident);
}
else {
parser->error_code = XP_STX_PARSER_ERROR_EXPRESSION_START;
return -1;
if (__parse_basic_expression(parser, XP_NULL) == -1) return -1;
}
return 0;
}
static int __parse_primary (xp_stx_parser_t* parser)
static int __parse_basic_expression (xp_stx_parser_t* parser, const xp_char_t* ident)
{
/*
* <primary> ::=
* identifier | <literal> |
* <block constructor> | ( '('<expression>')' )
* <basic expression> ::= <primary> [<messages> <cascaded messages>]
*/
if (parser->token.type == XP_STX_TOKEN_IDENT) {
}
else if (parser->token.type == XP_STX_TOKEN_CHARLIT) {
EMIT_CODE (parser, XP_TEXT("PushLiteral(CHAR)"), parser->token.name.buffer);
GET_TOKEN (parser);
if (__parse_primary(parser, ident) == -1) return -1;
if (parser->token.type != XP_STX_TOKEN_END &&
parser->token.type != XP_STX_TOKEN_PERIOD) {
if (__parse_message_continuation(parser) == -1) return -1;
}
else if (parser->token.type == XP_STX_TOKEN_STRLIT) {
EMIT_CODE (parser, XP_TEXT("PushLiteral(STR)"), parser->token.name.buffer);
GET_TOKEN (parser);
if (__parse_message_continuation(parser) == -1) return -1;
}
else if (parser->token.type == XP_STX_TOKEN_NUMLIT) {
EMIT_CODE (parser, XP_TEXT("PushLiteral(NUM)"), parser->token.name.buffer);
GET_TOKEN (parser);
if (__parse_message_continuation(parser) == -1) return -1;
}
/* TODO: more literals - array symbol #xxx #(1 2 3) */
else if (parser->token.type == XP_STX_TOKEN_LBRACKET) {
}
else if (parser->token.type == XP_STX_TOKEN_LPAREN) {
}
else {
/* TODO: maybe invalid primary */
parser->error_code = XP_STX_PARSER_ERROR_EXPRESSION_START;
return -1;
}
return 0;
}
/*
&unsupportedByte, //--- 00
&bytePushInstance, //--- 01
&bytePushArgument, //--- 02
&bytePushTemporary, //--- 03
&bytePushLiteral, //--- 04
&bytePushConstant, //--- 05
&byteAssignInstance, //--- 06
&byteAssignTemporary, //--- 07
&byteMarkArguments, //--- 08
&byteSendMessage, //--- 09
&byteSendUnary, //--- 10
&byteSendBinary, //--- 11
&unsupportedByte, //--- 12
&byteDoPrimitive, //--- 13
&unsupportedByte, //--- 14
&byteDoSpecial //--- 15
* Directly access by byte codes
> the receiver and arguments of the invoking message
> the values of the receiver's instance variables
> the values of any temporary variables required by the method
> seven special constants (true, false, nil, -1, 0, 1, and 2)
> 32 special message selectors
* contained in literal frame.
> shared variables (global, class, and pool)
> most literal constants (numbers, characters, strings, arrays, and symbols)
> most message selectors (those that are not special)
PushInstance
PushArgument -> normal arguments plus self/super(0)
PushTemporary
PushConstant -> nil, true, false, etc....
PushLiteral -> global variables, literal constants... -> access literal frame
AssignInstance
AssignTemporary
*/
static int __parse_assignment (
xp_stx_parser_t* parser, const xp_char_t* target)
{
@ -563,61 +513,177 @@ xp_sprintf (buf, xp_countof(buf), XP_TEXT("%d"), i);
return -1;
}
static int __parse_primary (xp_stx_parser_t* parser, const xp_char_t* ident)
{
/*
* <primary> ::=
* identifier | <literal> |
* <block constructor> | ( '('<expression>')' )
*/
if (ident == XP_NULL) {
if (parser->token.type == XP_STX_TOKEN_IDENT) {
/* TODO - check what this identifier is and generate proper code*/
EMIT_CODE (parser, XP_TEXT("PUSH_IDENT"), parser->token.name.buffer);
GET_TOKEN (parser);
}
else if (parser->token.type == XP_STX_TOKEN_CHARLIT) {
EMIT_CODE (parser, XP_TEXT("PushLiteral(CHAR)"), parser->token.name.buffer);
GET_TOKEN (parser);
}
else if (parser->token.type == XP_STX_TOKEN_STRLIT) {
EMIT_CODE (parser, XP_TEXT("PushLiteral(STR)"), parser->token.name.buffer);
GET_TOKEN (parser);
}
else if (parser->token.type == XP_STX_TOKEN_NUMLIT) {
EMIT_CODE (parser, XP_TEXT("PushLiteral(NUM)"), parser->token.name.buffer);
GET_TOKEN (parser);
}
else if (parser->token.type == XP_STX_TOKEN_SYMLIT) {
EMIT_CODE (parser, XP_TEXT("PushLiteral(SYM)"), parser->token.name.buffer);
GET_TOKEN (parser);
}
else if (parser->token.type == XP_STX_TOKEN_LBRACKET) {
GET_TOKEN (parser);
if (__parse_block_constructor (parser) == -1) return -1;
}
else if (parser->token.type == XP_STX_TOKEN_APAREN) {
/* TODO: array literal */
}
else if (parser->token.type == XP_STX_TOKEN_LPAREN) {
GET_TOKEN (parser);
if (__parse_expression (parser) == -1) return -1;
if (parser->token.type != XP_STX_TOKEN_RPAREN) {
parser->error_code = XP_STX_PARSER_ERROR_NO_RPAREN;
return -1;
}
GET_TOKEN (parser);
}
else {
parser->error_code = XP_STX_PARSER_ERROR_PRIMARY;
return -1;
}
}
else {
/* TODO - check what this identifier is and generate proper code*/
EMIT_CODE (parser, XP_TEXT("PUSH_IDENT"), ident);
}
return 0;
}
static int __parse_block (xp_stx_parser_t* parser)
{
/*
* <block constructor> ::= '[' <block body> ']'
* <block body> ::= [<block argument>* '|']
* [<temporaries>] [<statements>]
* <block argument> ::= ':' identifier
*/
return 0;
}
static int __parse_message_continuation (xp_stx_parser_t* parser)
{
/*
* <basic expression> ::=
* <primary> [<messages> <cascaded messages>]
* <messages> ::=
* (<unary message>+ <binary message>* [<keyword message>] ) |
* (<binary message>+ [<keyword message>] ) |
* <keyword message>
* <unary message> ::= unarySelector
* <binary message> ::= binarySelector <binary argument>
* <binary argument> ::= <primary> <unary message>*
* <keyword message> ::= (keyword <keyword argument> )+
* <keyword argument> ::= <primary> <unary message>* <binary message>*
* <cascaded messages> ::= (';' <messages>)*
*/
if (__parse_keyword_continuation(parser) == -1) return -1;
if (__parse_keyword_message(parser) == -1) return -1;
while (parser->token.type == XP_STX_TOKEN_SEMICOLON) {
EMIT_CODE (parser, XP_TEXT("DoSpecial(DUP_RECEIVER)"), XP_TEXT(""));
EMIT_CODE (parser, XP_TEXT("DoSpecial(DUP_RECEIVER(CASCADE))"), XP_TEXT(""));
GET_TOKEN (parser);
if (__parse_keyword_continuation (parser) == -1) return -1;
if (__parse_keyword_message (parser) == -1) return -1;
EMIT_CODE (parser, XP_TEXT("DoSpecial(POP_TOP)"), XP_TEXT(""));
}
return 0;
}
static int __parse_keyword_continuation (xp_stx_parser_t* parser)
static int __parse_keyword_message (xp_stx_parser_t* parser)
{
if (__parse_binary_continuation (parser) == -1) return -1;
/*
* <keyword message> ::= (keyword <keyword argument> )+
* <keyword argument> ::= <primary> <unary message>* <binary message>*
*/
xp_stx_name_t name;
if (__parse_binary_message (parser) == -1) return -1;
if (xp_stx_name_open(&name, 0) == XP_NULL) {
parser->error_code = XP_STX_PARSER_ERROR_MEMORY;
return -1;
}
while (parser->token.type == XP_STX_TOKEN_KEYWORD) {
if (xp_stx_name_adds(&name, parser->token.name.buffer) == -1) {
parser->error_code = XP_STX_PARSER_ERROR_MEMORY;
xp_stx_name_close (&name);
return -1;
}
GET_TOKEN (parser);
if (__parse_primary (parser, XP_NULL) == -1) {
xp_stx_name_close (&name);
return -1;
}
if (__parse_binary_message (parser) == -1) {
xp_stx_name_close (&name);
return -1;
}
}
EMIT_CODE (parser, XP_TEXT("SendKeyword"), name.buffer);
xp_stx_name_close (&name);
return 0;
}
static int __parse_binary_continuation (xp_stx_parser_t* parser)
static int __parse_binary_message (xp_stx_parser_t* parser)
{
/*
* <binary message> ::= binarySelector <binary argument>
* <binary argument> ::= <primary> <unary message>*
*/
if (__parse_unary_continuation (parser) == -1) return -1;
if (__parse_unary_message (parser) == -1) return -1;
while (parser->token.type == XP_STX_TOKEN_BINARY) {
EMIT_CODE (parser, XP_TEXT("SendBinary"), parser->token.name.buffer);
xp_char_t* op = xp_stx_token_yield (&parser->token, 0);
if (op == XP_NULL) {
parser->error_code = XP_STX_PARSER_ERROR_MEMORY;
return -1;
}
GET_TOKEN (parser);
if (__parse_primary (parser, XP_NULL) == -1) {
xp_free (op);
return -1;
}
if (__parse_unary_message (parser) == -1) {
xp_free (op);
return -1;
}
EMIT_CODE (parser, XP_TEXT("SendBinary"), op);
xp_free (op);
}
return 0;
}
static int __parse_unary_continuation (xp_stx_parser_t* parser)
static int __parse_unary_message (xp_stx_parser_t* parser)
{
/* <unary message> ::= unarySelector */
@ -657,6 +723,14 @@ static inline xp_bool_t __is_binary_char (xp_cint_t c)
c == XP_CHAR('~') || c == XP_CHAR('-');
}
static inline xp_bool_t __is_closing_char (xp_cint_t c)
{
return
c == XP_CHAR('.') || c == XP_CHAR(']') ||
c == XP_CHAR(')') || c == XP_CHAR(';') ||
c == XP_CHAR('\"') || c == XP_CHAR('\'');
}
static int __get_token (xp_stx_parser_t* parser)
{
xp_cint_t c;
@ -727,6 +801,39 @@ static int __get_token (xp_stx_parser_t* parser)
ADD_TOKEN_CHAR(parser, c);
GET_CHAR (parser);
}
else if (c == XP_CHAR('#')) {
/*ADD_TOKEN_CHAR(parser, c);*/
GET_CHAR (parser);
c = parser->curc;
if (c == XP_CHAR_EOF) {
parser->error_code = XP_STX_PARSER_ERROR_LITERAL;
return -1;
}
else if (c == XP_CHAR('(')) {
ADD_TOKEN_CHAR(parser, c);
parser->token.type = XP_STX_TOKEN_APAREN;
GET_CHAR (parser);
}
else if (c == XP_CHAR('\'')) {
GET_CHAR (parser);
if (__get_strlit(parser) == -1) return -1;
parser->token.type = XP_STX_TOKEN_SYMLIT;
}
else if (!__is_closing_char(c) && !xp_isspace(c)) {
do {
ADD_TOKEN_CHAR(parser, c);
GET_CHAR (parser);
c = parser->curc;
} while (!__is_closing_char(c) && !xp_isspace(c));
parser->token.type = XP_STX_TOKEN_SYMLIT;
}
else {
parser->error_code = XP_STX_PARSER_ERROR_LITERAL;
return -1;
}
}
else if (c == XP_CHAR('.')) {
parser->token.type = XP_STX_TOKEN_PERIOD;
ADD_TOKEN_CHAR(parser, c);
@ -766,7 +873,7 @@ static int __get_ident (xp_stx_parser_t* parser)
} while (xp_isalnum(c));
if (c == XP_CHAR(':')) {
ADD_TOKEN_CHAR(parser, c);
ADD_TOKEN_CHAR (parser, c);
parser->token.type = XP_STX_TOKEN_KEYWORD;
GET_CHAR (parser);
}

9
ase/stx/parser.h
View File

@ -1,5 +1,5 @@
/*
* $Id: parser.h,v 1.22 2005-06-19 16:16:33 bacon Exp $
* $Id: parser.h,v 1.23 2005-06-23 04:55:44 bacon Exp $
*/
#ifndef _XP_STX_PARSER_H_
@ -23,6 +23,7 @@ enum
XP_STX_PARSER_ERROR_CHAR,
XP_STX_PARSER_ERROR_CHARLIT,
XP_STX_PARSER_ERROR_STRLIT,
XP_STX_PARSER_ERROR_LITERAL,
/* syntatic error */
XP_STX_PARSER_ERROR_MESSAGE_SELECTOR,
@ -31,8 +32,10 @@ enum
XP_STX_PARSER_ERROR_TEMPORARIES_NOT_CLOSED,
XP_STX_PARSER_ERROR_TOO_MANY_TEMPORARIES,
XP_STX_PARSER_ERROR_PSEUDO_VARIABLE,
XP_STX_PARSER_ERROR_EXPRESSION_START,
XP_STX_PARSER_ERROR_NO_PERIOD
XP_STX_PARSER_ERROR_PRIMARY,
XP_STX_PARSER_ERROR_NO_PERIOD,
XP_STX_PARSER_ERROR_NO_RPAREN
};
enum

196
ase/stx/stx.bnf Normal file
View File

@ -0,0 +1,196 @@
~~~ method grammar ~~~
<method definition> ::=
<message pattern>
[<temporaries> ]
[<statements>]
<message pattern> ::= <unary pattern> |
<binary pattern> |
<keyword pattern>
<unary pattern> ::= unarySelector
<binary pattern> ::= binarySelector <method argument>
<keyword pattern> ::= (keyword <method argument>)+
<temporaries> ::= '|' <temporary variable list> '|'
<temporary variable list> ::= identifier*
<block constructor> ::= '[' <block body> ']'
<block body> ::= [<block argument>* '|']
[<temporaries>] [<statements>]
<block argument> ::= ':' identifier
<statements> ::=
(<return statement> ['.'] ) |
(<expression> ['.' [<statements>]])
<return statement> ::= returnOperator <expression>
<expression> ::=
<assignment> |
<basic expression>
<assignment> ::= <assignment target> assignmentOperator <expression>
<basic expression> ::=
<primary> [<messages> <cascaded messages>]
<assignment target> := identifier
<primary> ::=
identifier |
<literal> |
<block constructor> |
( '(' <expression> ')' )
<messages> ::=
(<unary message>+ <binary message>* [<keyword message>] ) |
(<binary message>+ [<keyword message>] ) |
<keyword message>
<unary message> ::= unarySelector
<binary message> ::= binarySelector <binary argument>
<binary argument> ::= <primary> <unary message>*
<keyword message> ::= (keyword <keyword argument> )+
<keyword argument> ::= <primary> <unary message>* <binary message>*
<cascaded messages> ::= (';' <messages>)*
<literal> ::=
<number literal> |
<string literal> |
<character literal> |
<symbol literal> |
<selector literal> |
<array literal>
<number literal> ::= ['-'] <number>
<number> ::= integer | float | scaledDecimal
<character literal> ::= quotedCharacter
<string literal> ::= quotedString
<symbol literal> ::= hashedString
<selector literal> ::= quotedSelector
<array literal> ::= '#(' <array element>* ')'
<array element> ::= <literal> | identifier
reserved identifiers -> nil true false self super
~~~ lexical grammar ~~~
character ::=
"Any character in the implementation-defined character set"
whitespace ::=
"Any non-printing character interpreted as white space
including spaces, tabs, and line breaks"
digit ::=
'0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9'
uppercaseAlphabetic ::=
'A' | 'B' | 'C' | 'D' | 'E' | 'F' | 'G' | 'H' | 'I' |
'J' | 'K' | 'L' | 'M' | 'N' | 'O' | 'P' | 'Q' | 'R' |
'S' | 'T' | 'U' | 'V' | 'W' | 'X' | 'Y' | 'Z'
lowercaseAlphabetic ::=
'a' | 'b' | 'c' | 'd' | 'e' | 'f' | 'g' | 'h' | 'i' |
'j' | 'k' | 'l' | 'm' | 'n' | 'o' | 'p' | 'q' | 'r' |
's' | 't' | 'u' | 'v' | 'w' | 'x' | 'y' | 'z'
nonCaseLetter ::= '_'
letter ::=
uppercaseAlphabetic |
lowercaseAlphabetic |
nonCaseLetter |
"implementation defined letters"
commentDelimiter ::= '"'
nonCommentDelimiter::=
"any character that is not a commentDelimiter "
comment :=
commentDelimiter nonCommentDelimiter * commentDelimiter
identifier ::= letter (letter | digit)*
keyword ::= identifier ':'
binaryCharacter ::=
'!' | '%' | '&' | '*' | '+' | ',' |
'/' | '<' | '=' | '>' | '?' | '@' |
'\' | '~' | '|' | '-'
binarySelector ::= binaryCharacter+
returnOperator ::= '^'
assignmentOperator ::= ':='
integer ::= decimalInteger | radixInteger
decimalInteger ::= digits
digits ::= digit+
radixInteger ::= radixSpecifier 'r' radixDigits
radixSpecifier := digits
radixDigits ::= (digit | uppercaseAlphabetic)+
float ::= mantissa [exponentLetter exponent]
mantissa ::= digits'.' digits
exponent ::= ['-']decimalInteger
exponentLetter ::= 'e' | 'd' | 'q'
scaledDecimal ::= scaledMantissa 's' [fractionalDigits]
scaledMantissa ::= decimalInteger | mantissa
fractionalDigits ::= decimalInteger
quotedCharacter ::= '$' character
quotedString ::= stringDelimiter stringBody stringDelimiter
stringBody ::= (nonStringDelimiter | (stringDelimiter stringDelimiter)*)
stringDelimiter ::= ''' "a single quote"
nonStringDelimiter ::= "any character except stringDelimiter"
hashedString ::= '#' quotedString
quotedSelector ::= '#' (unarySelector | binarySelector | keywordSelector)
keywordSelector ::= keyword+
separator ::= (whitespace | comment)*

41
ase/stx/stx.txt Normal file
View File

@ -0,0 +1,41 @@
/*
&unsupportedByte, //--- 00
&bytePushInstance, //--- 01
&bytePushArgument, //--- 02
&bytePushTemporary, //--- 03
&bytePushLiteral, //--- 04
&bytePushConstant, //--- 05
&byteAssignInstance, //--- 06
&byteAssignTemporary, //--- 07
&byteMarkArguments, //--- 08
&byteSendMessage, //--- 09
&byteSendUnary, //--- 10
&byteSendBinary, //--- 11
&unsupportedByte, //--- 12
&byteDoPrimitive, //--- 13
&unsupportedByte, //--- 14
&byteDoSpecial //--- 15
* Directly access by byte codes
> the receiver and arguments of the invoking message
> the values of the receiver's instance variables
> the values of any temporary variables required by the method
> seven special constants (true, false, nil, -1, 0, 1, and 2)
> 32 special message selectors
* contained in literal frame.
> shared variables (global, class, and pool)
> most literal constants (numbers, characters, strings, arrays, and symbols)
> most message selectors (those that are not special)
PushInstance
PushArgument -> normal arguments plus self/super(0)
PushTemporary
PushConstant -> nil, true, false, etc....
PushLiteral -> global variables, literal constants... -> access literal frame
AssignInstance
AssignTemporary
*/