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Declarations can now assign an initial value

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git-svn-id: http://picoc.googlecode.com/svn/trunk@156 21eae674-98b7-11dd-bd71-f92a316d2d60
This commit is contained in:
zik.saleeba 2009-03-06 04:55:11 +00:00
parent 886526f462
commit 8b410241ee
4 changed files with 45 additions and 20 deletions
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3
TODO
View file

@ -1,6 +1,6 @@
TODO
* change character constants to have a leading array length
* assignment on declaration
* pointers to array elements and struct elements
* operator precedence
* test character array pointers and dereferencing
@ -17,7 +17,6 @@ TODO
* periodic heap cleanup
* octal/hex character constants
* fix #include
* assignment on declaration
Need test/debug:
* all break/continue variations

55
parse.c
View file

@ -673,6 +673,43 @@ struct Value *ParseFunctionDefinition(struct ParseState *Parser, struct ValueTyp
return FuncValue;
}
/* declare a variable or function */
void ParseDeclaration(struct ParseState *Parser, enum LexToken Token)
{
char *Identifier;
struct ValueType *Typ;
struct Value *CValue;
TypeParse(Parser, &Typ, &Identifier);
if (Token == TokenVoidType && Identifier != StrEmpty)
ProgramFail(Parser, "can't define a void variable");
if ((Token != TokenVoidType && Token != TokenStructType && Token != TokenUnionType) && Identifier == StrEmpty)
ProgramFail(Parser, "identifier expected");
if (Identifier != StrEmpty)
{
/* handle function definitions */
if (LexGetToken(Parser, NULL, FALSE) == TokenOpenBracket)
ParseFunctionDefinition(Parser, Typ, Identifier, FALSE);
else
{
if (LexGetToken(Parser, NULL, FALSE) != TokenAssign)
VariableDefine(Parser, Identifier, VariableAllocValueFromType(Parser, Typ, TRUE, NULL));
else
{ /* we're assigning an initial value */
LexGetToken(Parser, NULL, TRUE);
if (!ParseExpression(Parser, &CValue))
ProgramFail(Parser, "expression expected");
VariableDefine(Parser, Identifier, CValue);
if (Parser->Mode == RunModeRun)
VariableStackPop(Parser, CValue);
}
}
}
}
/* parse a #define macro definition and store it for later */
void ParseMacroDefinition(struct ParseState *Parser)
{
@ -806,8 +843,6 @@ int ParseStatement(struct ParseState *Parser)
struct Value *CValue;
int Condition;
struct ParseState PreState = *Parser;
char *Identifier;
struct ValueType *Typ;
enum LexToken Token = LexGetToken(Parser, NULL, TRUE);
switch (Token)
@ -902,21 +937,7 @@ int ParseStatement(struct ParseState *Parser)
case TokenStructType:
case TokenUnionType:
*Parser = PreState;
TypeParse(Parser, &Typ, &Identifier);
if (Token == TokenVoidType && Identifier != StrEmpty)
ProgramFail(Parser, "can't define a void variable");
if ((Token != TokenVoidType && Token != TokenStructType && Token != TokenUnionType) && Identifier == StrEmpty)
ProgramFail(Parser, "identifier expected");
if (Identifier != StrEmpty)
{
/* handle function definitions */
if (LexGetToken(Parser, NULL, FALSE) == TokenOpenBracket)
ParseFunctionDefinition(Parser, Typ, Identifier, FALSE);
else
VariableDefine(Parser, Identifier, VariableAllocValueFromType(Parser, Typ, TRUE, NULL));
}
ParseDeclaration(Parser, Token);
break;
case TokenHashDefine:

6
tests/00_assignment.c
View file

@ -1,3 +1,7 @@
int a;
a = 42;
printint(a);
printf("%d\n", a);
int b = 64;
printf("%d\n", b);

1
tests/00_assignment.expect
View file

@ -1 +1,2 @@
42
64