From 0f3c53fb630b810e3927e7184273d424ff8b165a Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Sat, 11 Apr 2015 00:09:33 +0200
Subject: output: de-duplicate token value pushing

---
 src/output.cpp     | 19 +++++++++++++++-
 src/output_lr0.cpp |  1 -
 src/output_slr.cpp |  1 -
 src/parse.cpp      | 65 +++++++++---------------------------------------------
 4 files changed, 28 insertions(+), 58 deletions(-)

diff --git a/src/output.cpp b/src/output.cpp
index cfefbbb..1503c38 100644
--- a/src/output.cpp
+++ b/src/output.cpp
@@ -302,7 +302,7 @@ void output_t::emit_source() {
 
 	emit_reductions();
 
-	std::fprintf(source_file, "int %spush(%scontext_t *parser, int token, const %stoken_value_t *value", prefix(), prefix(), prefix());
+	std::fprintf(source_file, "static int %sdo_push(%scontext_t *parser, int token", prefix(), prefix());
 	for (const auto &arg : get_generator()->get_grammar().extra_args)
 		std::fprintf(source_file, ", %s %s", arg.first.c_str(), arg.second.c_str());
 	std::fprintf(source_file, ") {\n");
@@ -314,6 +314,23 @@ void output_t::emit_source() {
 
 	std::fprintf(source_file, "\t\t}\n");
 	std::fprintf(source_file, "\t}\n");
+	std::fprintf(source_file, "}\n\n");
+
+	std::fprintf(source_file, "int %spush(%scontext_t *parser, int token, const %stoken_value_t *value", prefix(), prefix(), prefix());
+	for (const auto &arg : get_generator()->get_grammar().extra_args)
+		std::fprintf(source_file, ", %s %s", arg.first.c_str(), arg.second.c_str());
+	std::fprintf(source_file, ") {\n");
+
+	std::fprintf(source_file, "\tint ret = %sdo_push(parser, token", prefix());
+	for (const auto &arg : get_generator()->get_grammar().extra_args)
+		std::fprintf(source_file, ", %s", arg.second.c_str());
+	std::fprintf(source_file, ");\n\n");
+
+	std::fprintf(source_file, "\tif (ret > 0)\n");
+	std::fprintf(source_file, "\t\tparser->stack[parser->top-1].value.token = *value;\n\n");
+
+	std::fprintf(source_file, "\treturn ret;\n");
+
 	std::fprintf(source_file, "}\n");
 }
 
diff --git a/src/output_lr0.cpp b/src/output_lr0.cpp
index 9d4897e..62c5966 100644
--- a/src/output_lr0.cpp
+++ b/src/output_lr0.cpp
@@ -43,7 +43,6 @@ void output_lr0_t::emit_state_shift(unsigned state) {
 			continue;
 
 		std::fprintf(source_file, "\t\t\tcase %s:\n", symbol_case(token).c_str());
-		std::fprintf(source_file, "\t\t\t\tparser->stack[parser->top].value.token = *value;\n");
 		std::fprintf(source_file, "\t\t\t\tparser->stack[++parser->top].state = %u;\n", unsigned(it->second));
 		std::fprintf(source_file, "\t\t\t\treturn 1;\n\n");
 	}
diff --git a/src/output_slr.cpp b/src/output_slr.cpp
index a58c331..1acd951 100644
--- a/src/output_slr.cpp
+++ b/src/output_slr.cpp
@@ -45,7 +45,6 @@ void output_slr_t::emit_state_shift(unsigned state) {
 		for (const symbol_t &sym : entry.second)
 			std::fprintf(source_file, "\t\t\tcase %s:\n", symbol_case(sym).c_str());
 
-		std::fprintf(source_file, "\t\t\t\tparser->stack[parser->top].value.token = *value;\n");
 		std::fprintf(source_file, "\t\t\t\tparser->stack[++parser->top].state = %u;\n", entry.first);
 		std::fprintf(source_file, "\t\t\t\treturn 1;\n\n");
 	}
diff --git a/src/parse.cpp b/src/parse.cpp
index bca53dc..afeafda 100644
--- a/src/parse.cpp
+++ b/src/parse.cpp
@@ -158,7 +158,7 @@ static inline std::string * parse_reduce_22(std::string * v, __attribute__((unus
 	return v;
 }
 
-int parse_push(parse_context_t *parser, int token, const parse_token_value_t *value, __attribute__((unused)) solar::grammar_t * grammar) {
+static int parse_do_push(parse_context_t *parser, int token, __attribute__((unused)) solar::grammar_t * grammar) {
 	while (1) {
 		switch (parser->stack[parser->top].state) {
 		case 0:
@@ -174,12 +174,10 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 				return 0;
 
 			case TOK_SYMBOL_LC:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 4;
 				return 1;
 
 			case '%':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 5;
 				return 1;
 
@@ -208,7 +206,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 4:
 			switch (token) {
 			case '|':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 6;
 				return 1;
 
@@ -220,22 +217,18 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 5:
 			switch (token) {
 			case 'e':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 7;
 				return 1;
 
 			case 'h':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 8;
 				return 1;
 
 			case 's':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 9;
 				return 1;
 
 			case 't':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 10;
 				return 1;
 
@@ -247,7 +240,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 6:
 			switch (token) {
 			case '=':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 11;
 				return 1;
 
@@ -259,7 +251,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 7:
 			switch (token) {
 			case 'x':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 12;
 				return 1;
 
@@ -271,7 +262,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 8:
 			switch (token) {
 			case 'e':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 13;
 				return 1;
 
@@ -283,7 +273,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 9:
 			switch (token) {
 			case 'o':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 14;
 				return 1;
 
@@ -295,7 +284,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 10:
 			switch (token) {
 			case 'y':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 15;
 				return 1;
 
@@ -315,7 +303,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 12:
 			switch (token) {
 			case 't':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 17;
 				return 1;
 
@@ -327,7 +314,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 13:
 			switch (token) {
 			case 'a':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 18;
 				return 1;
 
@@ -339,7 +325,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 14:
 			switch (token) {
 			case 'u':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 19;
 				return 1;
 
@@ -351,7 +336,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 15:
 			switch (token) {
 			case 'p':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 20;
 				return 1;
 
@@ -363,32 +347,26 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 16:
 			switch (token) {
 			case TOK_BLOCK:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 24;
 				return 1;
 
 			case TOK_CHAR:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 25;
 				return 1;
 
 			case TOK_STRING:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 26;
 				return 1;
 
 			case TOK_SYMBOL_LC:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 27;
 				return 1;
 
 			case TOK_SYMBOL_UC:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 28;
 				return 1;
 
 			case ';':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 29;
 				return 1;
 
@@ -400,7 +378,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 17:
 			switch (token) {
 			case 'r':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 30;
 				return 1;
 
@@ -412,7 +389,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 18:
 			switch (token) {
 			case 'd':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 31;
 				return 1;
 
@@ -424,7 +400,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 19:
 			switch (token) {
 			case 'r':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 32;
 				return 1;
 
@@ -436,7 +411,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 20:
 			switch (token) {
 			case 'e':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 33;
 				return 1;
 
@@ -457,7 +431,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 22:
 			switch (token) {
 			case '(':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 34;
 				return 1;
 
@@ -552,7 +525,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 30:
 			switch (token) {
 			case 'a':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 35;
 				return 1;
 
@@ -564,7 +536,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 31:
 			switch (token) {
 			case 'e':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 36;
 				return 1;
 
@@ -576,7 +547,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 32:
 			switch (token) {
 			case 'c':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 37;
 				return 1;
 
@@ -588,17 +558,14 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 33:
 			switch (token) {
 			case TOK_CHAR:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 25;
 				return 1;
 
 			case TOK_SYMBOL_UC:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 28;
 				return 1;
 
 			case TOK_SYMBOL_LC:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 39;
 				return 1;
 
@@ -610,17 +577,14 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 34:
 			switch (token) {
 			case TOK_SYMBOL:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 41;
 				return 1;
 
 			case TOK_SYMBOL_LC:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 42;
 				return 1;
 
 			case TOK_SYMBOL_UC:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 43;
 				return 1;
 
@@ -632,7 +596,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 35:
 			switch (token) {
 			case '_':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 44;
 				return 1;
 
@@ -644,7 +607,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 36:
 			switch (token) {
 			case 'r':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 45;
 				return 1;
 
@@ -656,7 +618,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 37:
 			switch (token) {
 			case 'e':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 46;
 				return 1;
 
@@ -668,7 +629,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 38:
 			switch (token) {
 			case TOK_BLOCK:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 47;
 				return 1;
 
@@ -680,7 +640,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 39:
 			switch (token) {
 			case TOK_BLOCK:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 48;
 				return 1;
 
@@ -692,7 +651,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 40:
 			switch (token) {
 			case ')':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 49;
 				return 1;
 
@@ -770,7 +728,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 44:
 			switch (token) {
 			case 'a':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 50;
 				return 1;
 
@@ -782,7 +739,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 45:
 			switch (token) {
 			case TOK_BLOCK:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 51;
 				return 1;
 
@@ -794,7 +750,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 46:
 			switch (token) {
 			case TOK_BLOCK:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 52;
 				return 1;
 
@@ -806,17 +761,14 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 47:
 			switch (token) {
 			case TOK_SYMBOL:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 41;
 				return 1;
 
 			case TOK_SYMBOL_LC:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 42;
 				return 1;
 
 			case TOK_SYMBOL_UC:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 43;
 				return 1;
 
@@ -846,7 +798,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 50:
 			switch (token) {
 			case 'r':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 54;
 				return 1;
 
@@ -885,7 +836,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 54:
 			switch (token) {
 			case 'g':
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 55;
 				return 1;
 
@@ -897,7 +847,6 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 55:
 			switch (token) {
 			case TOK_BLOCK:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 56;
 				return 1;
 
@@ -909,17 +858,14 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		case 56:
 			switch (token) {
 			case TOK_SYMBOL:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 41;
 				return 1;
 
 			case TOK_SYMBOL_LC:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 42;
 				return 1;
 
 			case TOK_SYMBOL_UC:
-				parser->stack[parser->top].value.token = *value;
 				parser->stack[++parser->top].state = 43;
 				return 1;
 
@@ -940,3 +886,12 @@ int parse_push(parse_context_t *parser, int token, const parse_token_value_t *va
 		}
 	}
 }
+
+int parse_push(parse_context_t *parser, int token, const parse_token_value_t *value, __attribute__((unused)) solar::grammar_t * grammar) {
+	int ret = parse_do_push(parser, token, grammar);
+
+	if (ret > 0)
+		parser->stack[parser->top-1].value.token = *value;
+
+	return ret;
+}
-- 
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