From c7f381fbcb57ba1b7e33558a28fdb34f31234c07 Mon Sep 17 00:00:00 2001
From: David Kerkeslager <kerkeslager@gmail.com>
Date: Tue, 1 Oct 2019 01:19:09 -0400
Subject: [PATCH] Implement negatives, use typedef

---
 c_generation.py                |  1 +
 crossplatform_ir_generation.py |  5 +++--
 templates/program2.c           | 26 ++++++++++++++++++--------
 3 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/c_generation.py b/c_generation.py
index 2f4a9de..fba8f50 100644
--- a/c_generation.py
+++ b/c_generation.py
@@ -47,6 +47,7 @@ def generate_argument(instruction):
             'idiv': generate_size_t_argument,
             'mod': generate_size_t_argument,
             'mul': generate_size_t_argument,
+            'neg': generate_size_t_argument,
             'pop': generate_symbol_argument,
             'push': generate_symbol_argument,
             'push_integer': generate_integer_argument,
diff --git a/crossplatform_ir_generation.py b/crossplatform_ir_generation.py
index 089b076..c452126 100644
--- a/crossplatform_ir_generation.py
+++ b/crossplatform_ir_generation.py
@@ -40,10 +40,11 @@ def generate_instruction_name_from_builtin(builtin):
     try:
         return {
             '__add__': 'add',
-            '__subtract__': 'sub',
-            '__multiply__': 'mul',
             '__integer_divide__': 'idiv',
             '__modular_divide__': 'mod',
+            '__multiply__': 'mul',
+            '__negate__': 'neg',
+            '__subtract__': 'sub',
         }[builtin]
 
     except KeyError:
diff --git a/templates/program2.c b/templates/program2.c
index 76fc2f8..8602054 100644
--- a/templates/program2.c
+++ b/templates/program2.c
@@ -72,7 +72,7 @@ union Argument {
   int32_t integer;
 };
 
-void call(struct Thread* thread, const union Argument argument) {
+void call(struct Thread* thread, Argument argument) {
   assert(!Stack_isEmpty(&(thread->stack)));
   Object f = Stack_pop(&(thread->stack));
   size_t argumentCount = argument.label;
@@ -142,13 +142,13 @@ void call(struct Thread* thread, const union Argument argument) {
 {% endwith %}
 
 
-void drop(struct Thread* thread, const union Argument argument) {
+void drop(struct Thread* thread, Argument argument) {
   assert(!Stack_isEmpty(&(thread->stack)));
   Object result = Stack_pop(&(thread->stack));
   Object_deinitialize(&result);
 }
 
-void end(struct Thread* thread, const union Argument argument) {
+void end(struct Thread* thread, Argument argument) {
 }
 
 {% with name='idiv', operation='/' %}
@@ -163,7 +163,17 @@ void end(struct Thread* thread, const union Argument argument) {
   {% include "arithmetic_instruction.c" %}
 {% endwith %}
 
-void pop(struct Thread* thread, const union Argument argument) {
+void neg(struct Thread* thread, Argument argument) {
+  assert(!Stack_isEmpty(&(thread->stack)));
+  Object result = Stack_pop(&(thread->stack));
+  assert(result.type == INTEGER);
+
+  result.value.integer = -(result.value.integer);
+
+  Stack_push(&(thread->stack), result);
+}
+
+void pop(struct Thread* thread, Argument argument) {
   char* argumentString = argument.string;
 
   assert(!Stack_isEmpty(&(thread->stack)));
@@ -179,7 +189,7 @@ void pop(struct Thread* thread, const union Argument argument) {
   Environment_set(thread->environment, argumentString, result);
 }
 
-void push(struct Thread* thread, const union Argument argument) {
+void push(struct Thread* thread, Argument argument) {
   char* argumentString = argument.string;
 
   if(strcmp(argumentString, "print") == 0) {
@@ -202,7 +212,7 @@ void push(struct Thread* thread, const union Argument argument) {
   }
 }
 
-void push_integer(struct Thread* thread, const union Argument argument) {
+void push_integer(struct Thread* thread, Argument argument) {
   Object result;
   result.type = INTEGER;
   result.value.integer = argument.integer;
@@ -210,7 +220,7 @@ void push_integer(struct Thread* thread, const union Argument argument) {
   Stack_push(&(thread->stack), result);
 }
 
-void push_string(struct Thread* thread, const union Argument argument) {
+void push_string(struct Thread* thread, Argument argument) {
   Object result;
   result.type = STRING;
   result.value.string = argument.string;
@@ -225,7 +235,7 @@ void push_string(struct Thread* thread, const union Argument argument) {
 struct Instruction;
 typedef const struct Instruction Instruction;
 struct Instruction {
-  void (*instruction)(struct Thread*,const union Argument);
+  void (*instruction)(struct Thread*,Argument);
   Argument argument;
 };
 
-- 
2.20.1