From ca8e5e46c4d3bcb402cb3439a9a1cdc42d6d45c7 Mon Sep 17 00:00:00 2001
From: Bobby Bingham <koorogi@koorogi.info>
Date: Sat, 14 Jan 2017 16:14:35 -0600
Subject: nqasm: Handle pc offset arguments

---
 parser.y | 34 ++++++++++++++++++++--------------
 1 file changed, 20 insertions(+), 14 deletions(-)

diff --git a/parser.y b/parser.y
index 2d34400..237b71d 100644
--- a/parser.y
+++ b/parser.y
@@ -81,12 +81,14 @@ void yyerror(const char *msg)
 
 %type <inst> inst
 %type <arg>  imm
+%type <arg>  pcoff
 %type <args> a_reg2
 %type <args> a_reg3
 %type <args> a_regp
 %type <args> a_regp_reg
 %type <args> a_reg_regp
 %type <args> a_reg_imm
+%type <args> a_pcoff
 %type <lval> intlit
 
 %%
@@ -126,20 +128,13 @@ inst:
 	|	T_LD_W   a_reg_regp  { $$ = INSTRUCTION_ARGS(LD_W,   $2); }
 	|	T_LDI_BL a_reg_imm   { $$ = INSTRUCTION_ARGS(LDI_BL, $2); }
 	|	T_LDI_BH a_reg_imm   { $$ = INSTRUCTION_ARGS(LDI_BH, $2); }
-	|	T_BEQ
-		{ $$ = INSTRUCTION(BEQ); }
-	|	T_BNE
-		{ $$ = INSTRUCTION(BNE); }
-	|	T_BGT
-		{ $$ = INSTRUCTION(BGT); }
-	|	T_BGE
-		{ $$ = INSTRUCTION(BGE); }
-	|	T_BLT
-		{ $$ = INSTRUCTION(BLT); }
-	|	T_BLE
-		{ $$ = INSTRUCTION(BLE); }
-	|	T_BRA
-		{ $$ = INSTRUCTION(BRA); }
+	|	T_BEQ    a_pcoff     { $$ = INSTRUCTION_ARGS(BEQ,    $2); }
+	|	T_BNE    a_pcoff     { $$ = INSTRUCTION_ARGS(BNE,    $2); }
+	|	T_BGT    a_pcoff     { $$ = INSTRUCTION_ARGS(BGT,    $2); }
+	|	T_BGE    a_pcoff     { $$ = INSTRUCTION_ARGS(BGE,    $2); }
+	|	T_BLT    a_pcoff     { $$ = INSTRUCTION_ARGS(BLT,    $2); }
+	|	T_BLE    a_pcoff     { $$ = INSTRUCTION_ARGS(BLE,    $2); }
+	|	T_BRA    a_pcoff     { $$ = INSTRUCTION_ARGS(BRA,    $2); }
 	|	T_JMP    a_regp      { $$ = INSTRUCTION_ARGS(JMP,    $2); }
 	|	T_ADDPC  a_reg_imm   { $$ = INSTRUCTION_ARGS(ADDPC,  $2); }
 	|	T_NOP
@@ -158,6 +153,17 @@ a_reg_regp:
 	T_SPACE T_REG "," T_REGPTR           { $$ = MKARGS($2, $4);     }
 a_reg_imm:
 	T_SPACE T_REG "," imm                { $$ = MKARGS($2, $4);     }
+a_pcoff:
+	T_SPACE pcoff                        { $$ = MKARGS($2);         }
+
+pcoff:	intlit {
+			if (-0x80 > $1 || $1 > 0x7f) {
+				yyerror("pc offset operand out of range");
+				YYERROR;
+			} else {
+				$$ = MKARGVALUE((uint8_t) $1);
+			}
+		}
 
 imm:	intlit {
 			if (-0x80 > $1 || $1 > 0xff) {
-- 
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