From c0feca77799b859a5331417595ac0190bb999e0d Mon Sep 17 00:00:00 2001
From: pacien
Date: Wed, 6 Jun 2018 15:10:11 +0200
Subject: extract while instr

---
 src/generator.c | 14 +++++++++++++-
 src/generator.h |  4 ++++
 src/tpc.y       |  6 +++---
 3 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/src/generator.c b/src/generator.c
index e4b79e3..9948966 100644
--- a/src/generator.c
+++ b/src/generator.c
@@ -74,7 +74,7 @@ void gen_prologue_continue(bool *bss_done) {
   fprintf(output, "pop rsi\n");
   fprintf(output, "pop rbp\n");
   fprintf(output, "ret\n");
-  *bss_done = 1;
+  *bss_done = true;
 }
 
 void gen_epilogue() {
@@ -523,3 +523,15 @@ int gen_char(int value, Scope scope) {
   fprintf(output, "push %d\n", value);
   return CHAR;
 }
+
+void gen_while_start(int id) {
+  fprintf(output,".upwhile%d:\n", id);
+}
+
+void gen_while_cond(int id) {
+  fprintf(output,"pop rax\ncmp rax,0\njz .downwhile%d\n", id);
+}
+
+void gen_while_end(int id) {
+  fprintf(output,"jmp .upwhile%d\n.downwhile%d:\n", id, id); 
+}
diff --git a/src/generator.h b/src/generator.h
index e1fd714..94b03c8 100644
--- a/src/generator.h
+++ b/src/generator.h
@@ -38,6 +38,10 @@ void gen_if_start(int idx);
 void gen_if_end(int idx);
 void gen_ifelse_end(int idx);
 
+void gen_while_start(int id);
+void gen_while_cond(int id);
+void gen_while_end(int id);
+
 int gen_assign(const char ident[], Scope scope);
 
 void gen_or(int left, int right, int idx);
diff --git a/src/tpc.y b/src/tpc.y
index 16dc5ad..1e6b6e2 100644
--- a/src/tpc.y
+++ b/src/tpc.y
@@ -135,9 +135,9 @@ Instr:
 | IF '(' Exp IfHandling')' Instr    { gen_if_label($<num>4); }
 | IF '(' Exp IfHandling')' Instr
   ELSE IfEndHandling Instr IfElseEndHandling
-| WHILE                             { fprintf(output,".upwhile%d:\n", num_while); }
-  '(' Exp                           { fprintf(output,"pop rax\ncmp rax,0\njz .downwhile%d\n", num_while); }
-  ')' Instr                         { fprintf(output,"jmp .upwhile%d\n.downwhile%d:\n", num_while, num_while); num_while++; }
+| WHILE                             { gen_while_start(num_while); }
+  '(' Exp                           { gen_while_cond(num_while); }
+  ')' Instr                         { gen_while_end(num_while++); }
 | '{' SuiteInstr '}'
 ;
 IfHandling:                         { gen_if_start($<num>$ = num_if++); };
-- 
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