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authorAryadev Chavali <aryadev@aryadevchavali.com>2023-10-23 04:25:30 +0100
committerAryadev Chavali <aryadev@aryadevchavali.com>2023-10-23 04:25:48 +0100
commit0ac634a9bec04934398a431bfc1b9a7a27561f0c (patch)
tree25b729285ad0afb2fa6b17125aab75cce9b7b642
parentac57e32a0222a3f18e138f0a358d1d01921be3a0 (diff)
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Reintroduced example fib.c via examples/ folder
-rw-r--r--Makefile23
-rw-r--r--examples/fib.c79
2 files changed, 99 insertions, 3 deletions
diff --git a/Makefile b/Makefile
index f4bde0f..bd3cdff 100644
--- a/Makefile
+++ b/Makefile
@@ -23,19 +23,24 @@ VM_DIST=$(DIST)/vm
VM_SRC=vm
VM_CODE:=$(addprefix $(VM_SRC)/, inst.c runtime.c)
VM_OBJECTS:=$(VM_CODE:$(VM_SRC)/%.c=$(VM_DIST)/%.o)
-VM_DEPS:=$(VM_OBJECTS:%.o=%.d) $(VM_DIST)/fib.d $(VM_DIST)/main.d
+VM_DEPS:=$(VM_OBJECTS:%.o=%.d) $(VM_DIST)/main.d
VM_VERBOSE=0
VM_CFLAGS:=$(CFLAGS) -D VERBOSE=$(VM_VERBOSE)
VM_OUT=$(DIST)/ovm.out
+## EXAMPLES setup
+EXAMPLES_DIST=$(DIST)/examples
+EXAMPLES_SRC=examples
+EXAMPLES_CFLAGS=$(CFLAGS)
+EXAMPLES=$(DIST)/fib.out
+
# Things you want to build on `make`
all: $(DIST) lib vm examples
lib: $(LIB_DIST) $(LIB_OBJECTS)
vm: $(VM_DIST) $(VM_OUT)
-examples: vm-examples
-vm-examples: $(VM_DIST) $(VM_DIST)/fib.out
+examples: $(EXAMPLES_DIST) $(EXAMPLES)
# Recipes
## LIB Recipes
@@ -56,6 +61,15 @@ $(VM_DIST)/%.o: $(VM_SRC)/%.c
@$(CC) $(VM_CFLAGS) -MMD -c $< -o $@ $(LIBS)
@echo -e "$(TERM_GREEN)$@$(TERM_RESET)"
+## EXAMPLES recipes
+$(DIST)/fib.out: $(LIB_OBJECTS) $(VM_OBJECTS) $(ASM_OBJECTS) $(EXAMPLES_DIST)/fib.o
+ @$(CC) $(EXAMPLES_CFLAGS) $^ -o $@ $(LIBS)
+ @echo -e "$(TERM_GREEN)$@$(TERM_RESET)"
+
+$(EXAMPLES_DIST)/%.o: $(EXAMPLES_SRC)/%.c
+ @$(CC) $(EXAMPLES_CFLAGS) -MMD -c $< -o $@ $(LIBS)
+ @echo -e "$(TERM_GREEN)$@$(TERM_RESET)"
+
OUT=
ARGS=
.PHONY: run
@@ -75,3 +89,6 @@ $(LIB_DIST):
$(VM_DIST):
mkdir -p $(VM_DIST)
+
+$(EXAMPLES_DIST):
+ mkdir -p $(EXAMPLES_DIST)
diff --git a/examples/fib.c b/examples/fib.c
new file mode 100644
index 0000000..17a9ef8
--- /dev/null
+++ b/examples/fib.c
@@ -0,0 +1,79 @@
+/* Copyright (C) 2023 Aryadev Chavali
+
+ * You may distribute and modify this code under the terms of the GPLv2
+ * license. You should have received a copy of the GPLv2 license with
+ * this file. If not, please write to: aryadev@aryadevchavali.com.
+
+ * Created: 2023-10-23
+ * Author: Aryadev Chavali
+ * Description: An example virtual machine program which computes and
+ * prints fibonacci numbers. Note that by default the virtual machine
+ * just rolls overflows over, so this program will never terminate.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "../vm/inst.h"
+#include "../vm/runtime.h"
+
+int main(void)
+{
+ inst_t instructions[] = {
+ // MOV the values 1 and 1 to REG[0] and REG[1] respectively
+ INST_PUSH(WORD, 1),
+ INST_MOV(WORD, 0),
+ INST_PUSH(WORD, 1),
+ INST_MOV(WORD, 1),
+
+ // Print value at register 0 with newline.
+ INST_PUSH_REG(WORD, 0), // <-- #
+ INST_PRINT(WORD),
+ INST_PUSH(BYTE, '\n'),
+ INST_PRINT(CHAR),
+
+ // Print value at register 1 with newline
+ INST_PUSH_REG(WORD, 1),
+ INST_PRINT(WORD),
+ INST_PUSH(BYTE, '\n'),
+ INST_PRINT(CHAR),
+
+ /* Compute the next pair of fibonacci numbers */
+ // REG[0] + REG[1]
+ INST_PUSH_REG(WORD, 0),
+ INST_PUSH_REG(WORD, 1),
+ INST_PLUS(WORD),
+
+ // Mov REG[0] + REG[1] to REG[0]
+ INST_MOV(WORD, 0),
+
+ // REG[0] + REG[1]
+ INST_PUSH_REG(WORD, 0),
+ INST_PUSH_REG(WORD, 1),
+ INST_PLUS(WORD),
+
+ // Mov REG[0] + REG[1] to REG[1]
+ INST_MOV(WORD, 1),
+
+ // Jump to the point #
+ INST_JUMP_ABS(4),
+ INST_HALT,
+ };
+
+ byte stack[256];
+ vm_t vm = {0};
+ vm_load_stack(&vm, stack, ARR_SIZE(stack));
+ vm_load_program(&vm, instructions, ARR_SIZE(instructions));
+ err_t err = vm_execute_all(&vm);
+
+ if (err)
+ {
+ const char *error_str = err_as_cstr(err);
+ fprintf(stderr, "[ERROR]: %s\n", error_str);
+ fprintf(stderr, "[ERROR]: VM Trace:\n");
+ vm_print_all(&vm, stderr);
+ return 255 - err;
+ }
+ return 0;
+}