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more parser

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Motiejus Jakštys
2025-01-09 07:27:24 +01:00
parent aa0fab43e4
commit 5c65136bf5
1 changed files with 253 additions and 14 deletions
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267
parser.c
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@@ -1,3 +1,4 @@
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -9,6 +10,12 @@
const AstNodeIndex null_node = 0;
const AstTokenIndex null_token = ~(AstTokenIndex)(0);
static AstNodeIndex parsePrefixExpr(Parser*);
static AstNodeIndex parseTypeExpr(Parser*);
static AstNodeIndex parseBlock(Parser* p);
static AstNodeIndex parseLabeledStatement(Parser*);
static AstNodeIndex parseExpr(Parser*);
typedef struct {
enum { FIELD_STATE_NONE, FIELD_STATE_SEEN, FIELD_STATE_END } tag;
union {
@@ -75,6 +82,12 @@ static AstTokenIndex eatToken(Parser* p, TokenizerTag tag) {
}
}
static AstTokenIndex assertToken(Parser* p, TokenizerTag tag) {
const AstTokenIndex token = nextToken(p);
assert(p->token_tags[token] == tag);
return token;
}
static void eatDocComments(Parser* p) {
while (eatToken(p, TOKEN_DOC_COMMENT) != null_token) { }
}
@@ -150,8 +163,6 @@ static AstNodeIndex parseCallconv(Parser* p) {
return 0; // tcc
}
static AstNodeIndex parseTypeExpr(Parser*);
typedef struct {
AstNodeIndex align_expr, value_expr;
} NodeContainerField;
@@ -207,6 +218,29 @@ static AstNodeIndex expectContainerField(Parser* p) {
}
}
static AstNodeIndex parseBuiltinCall(Parser* p) {
const AstNodeIndex builtin_token = assertToken(p, TOKEN_BUILTIN);
eatToken(p, TOKEN_L_PAREN);
CleanupScratch scratch_top __attribute__((__cleanup__(cleanupScratch)))
= initCleanupScratch(p);
while (true) {
if (eatToken(p, TOKEN_R_PAREN) != null_token)
break;
const AstNodeIndex param = parseExpr(p);
SLICE_APPEND(AstNodeIndex, &p->scratch, param);
// TODO finish
}
(void)builtin_token;
fprintf(stderr, "parseBuiltinCall not implemented\n");
exit(1);
return 0; // tcc
}
static AstNodeIndex parsePrimaryTypeExpr(Parser* p) {
const TokenizerTag tok = p->token_tags[p->tok_i];
switch (tok) {
@@ -216,6 +250,7 @@ static AstNodeIndex parsePrimaryTypeExpr(Parser* p) {
case TOKEN_KEYWORD_ANYFRAME:
case TOKEN_STRING_LITERAL:
case TOKEN_BUILTIN:
return parseBuiltinCall(p);
case TOKEN_KEYWORD_FN:
case TOKEN_KEYWORD_IF:
case TOKEN_KEYWORD_SWITCH:
@@ -516,11 +551,56 @@ static AstNodeIndex parseAssignExpr(Parser* p) {
}
static AstNodeIndex parseVarDeclProto(Parser* p) {
if (eatToken(p, TOKEN_KEYWORD_CONST) == null_token
|| eatToken(p, TOKEN_KEYWORD_VAR) == null_token)
AstTokenIndex mut_token;
if ((mut_token = eatToken(p, TOKEN_KEYWORD_CONST)) == null_token)
if ((mut_token = eatToken(p, TOKEN_KEYWORD_VAR)) == null_token)
return null_node;
expectToken(p, TOKEN_IDENTIFIER);
const AstNodeIndex type_node
= eatToken(p, TOKEN_COLON) == null_token ? 0 : parseTypeExpr(p);
const AstNodeIndex align_node = parseByteAlign(p);
const AstNodeIndex addrspace_node = parseAddrSpace(p);
const AstNodeIndex section_node = parseLinkSection(p);
if (section_node == 0 && addrspace_node == 0) {
if (align_node == 0) {
return addNode(
&p->nodes,
(AstNodeItem) {
.tag = AST_NODE_SIMPLE_VAR_DECL,
.main_token = mut_token,
.data = {
.lhs = type_node,
.rhs = 0,
},
});
}
fprintf(stderr, "parseVarDecl got something too complicated\n");
exit(1);
} else {
fprintf(stderr, "parseVarDecl got something too complicated\n");
exit(1);
}
return 0; // tcc
}
static AstTokenIndex parseBreakLabel(Parser* p) {
if (eatToken(p, TOKEN_COLON) == null_node)
return null_node;
return expectToken(p, TOKEN_IDENTIFIER);
}
static AstNodeIndex parseCurlySuffixExpr(Parser* p) {
const AstNodeIndex lhs = parseTypeExpr(p);
if (lhs == 0)
return null_node;
fprintf(stderr, "parseVarDeclProto: parsing vars is not supported\n");
const AstTokenIndex lbrace = eatToken(p, TOKEN_L_BRACE);
if (lbrace == null_token)
return lhs;
fprintf(stderr, "parseCurlySuffixExpr is not implemented\n");
exit(1);
return 0; // tcc
}
@@ -619,25 +699,184 @@ static OperInfo operTable(TokenizerTag tok_tag) {
}
}
static AstNodeIndex parseExprPrecedence(Parser* p, int32_t min_prec) {
(void)p;
assert(min_prec >= 0);
AstNodeIndex node = parsePrefixExpr(p);
if (node == 0)
return null_node;
int8_t banned_prec = -1;
while (true) {
const TokenizerTag tok_tag = p->token_tags[p->tok_i];
const OperInfo info = operTable(tok_tag);
if (info.prec < min_prec)
break;
assert(info.prec != banned_prec);
const AstTokenIndex oper_token = nextToken(p);
if (tok_tag == TOKEN_KEYWORD_CATCH) {
fprintf(stderr, "parsePayload not supported\n");
exit(1);
return 0; // tcc
}
const AstNodeIndex rhs = parseExprPrecedence(p, info.prec + 1);
assert(rhs != 0);
node = addNode(
&p->nodes,
(AstNodeItem) {
.tag = info.tag,
.main_token = oper_token,
.data = {
.lhs = node,
.rhs = rhs,
},
});
if (info.assoc == ASSOC_NONE)
banned_prec = info.prec;
}
return node;
}
static AstNodeIndex parseExpr(Parser* p) { return parseExprPrecedence(p, 0); }
static AstNodeIndex parsePrimaryExpr(Parser* p) {
const char* tok = tokenizerGetTagString(p->token_tags[p->tok_i]);
switch (p->token_tags[p->tok_i]) {
case TOKEN_KEYWORD_ASM:
case TOKEN_KEYWORD_IF:
fprintf(stderr, "parsePrimaryExpr does not implement %s\n", tok);
exit(1);
break;
case TOKEN_KEYWORD_BREAK:
return addNode(
&p->nodes,
(AstNodeItem) {
.tag = AST_NODE_BREAK,
.main_token = nextToken(p),
.data = {
.lhs = parseBreakLabel(p),
.rhs = parseExpr(p),
},
});
case TOKEN_KEYWORD_CONTINUE:
return addNode(
&p->nodes,
(AstNodeItem) {
.tag = AST_NODE_CONTINUE,
.main_token = nextToken(p),
.data = {
.lhs = parseBreakLabel(p),
.rhs = parseExpr(p),
},
});
case TOKEN_KEYWORD_COMPTIME:
case TOKEN_KEYWORD_NOSUSPEND:
case TOKEN_KEYWORD_RESUME:
case TOKEN_KEYWORD_RETURN:
fprintf(stderr, "parsePrimaryExpr does not implement %s\n", tok);
exit(1);
return 0; // tcc
case TOKEN_IDENTIFIER:
if (p->token_tags[p->tok_i + 1] == TOKEN_COLON) {
switch (p->token_tags[p->tok_i + 2]) {
case TOKEN_KEYWORD_INLINE:
case TOKEN_KEYWORD_FOR:
case TOKEN_KEYWORD_WHILE:
fprintf(stderr, "parsePrimaryExpr NotImplemented\n");
exit(1);
return 0; // tcc
case TOKEN_L_BRACE:
p->tok_i += 2;
return parseBlock(p);
default:
return parseCurlySuffixExpr(p);
}
} else {
return parseCurlySuffixExpr(p);
}
case TOKEN_KEYWORD_INLINE:
case TOKEN_KEYWORD_FOR:
case TOKEN_KEYWORD_WHILE:
fprintf(stderr, "parsePrimaryExpr does not implement %s\n", tok);
exit(1);
return 0; // tcc
case TOKEN_L_BRACE:
return parseBlock(p);
default:
return parseCurlySuffixExpr(p);
}
}
static AstNodeIndex parsePrefixExpr(Parser* p) {
AstNodeTag tag;
switch (p->token_tags[p->tok_i]) {
case TOKEN_BANG:
tag = AST_NODE_BOOL_NOT;
break;
case TOKEN_MINUS:
tag = AST_NODE_NEGATION;
break;
case TOKEN_TILDE:
tag = AST_NODE_BIT_NOT;
break;
case TOKEN_MINUS_PERCENT:
tag = AST_NODE_NEGATION_WRAP;
break;
case TOKEN_AMPERSAND:
tag = AST_NODE_ADDRESS_OF;
break;
case TOKEN_KEYWORD_TRY:
tag = AST_NODE_TRY;
break;
case TOKEN_KEYWORD_AWAIT:
tag = AST_NODE_AWAIT;
break;
default:
return parsePrimaryExpr(p);
}
return addNode(
&p->nodes,
(AstNodeItem) {
.tag = tag,
.main_token = nextToken(p),
.data = {
.lhs = parsePrefixExpr(p),
.rhs = 0,
},
});
}
static AstNodeIndex expectVarDeclExprStatement(Parser* p) {
CleanupScratch scratch_top __attribute__((__cleanup__(cleanupScratch)))
= initCleanupScratch(p);
// while(true) {
// const AstNodeIndex var_decl_proto = parseVarDeclProto(p);
// if (var_decl_proto != 0) {
// SLICE_APPEND(AstNodeIndex, &p->scratch, var_decl_proto);
// } else {
while (true) {
const AstNodeIndex var_decl_proto = parseVarDeclProto(p);
if (var_decl_proto != 0) {
SLICE_APPEND(AstNodeIndex, &p->scratch, var_decl_proto);
} else {
const AstNodeIndex expr = parseExpr(p);
SLICE_APPEND(AstNodeIndex, &p->scratch, expr);
}
if (eatToken(p, TOKEN_COMMA) == null_node)
break;
}
// }
//}
const uint32_t lhs_count = p->scratch.len - scratch_top.old_len;
assert(lhs_count > 0);
fprintf(stderr, "expectVarDeclExprStatement not implemented\n");
fprintf(stderr, "expectVarDeclExprStatement only partially implemented\n");
exit(1);
return 0; // tcc
}
static AstNodeIndex parseLabeledStatement(Parser*);
static AstNodeIndex expectStatement(Parser* p, bool allow_defer_var) {
if (eatToken(p, TOKEN_KEYWORD_COMPTIME) != null_token) {
fprintf(stderr, "expectStatement: comptime keyword not supported\n");