cpp rtti examples

tests/CPP/rtti/Makefile

@@ -0,0 +1,50 @@
+TARGET   = rtti
+
+TARGET_ARCH = riscv32
+
+CC       = riscv32-unknown-elf-g++
+
+# compiling flags here
+CFLAGS = -Wall -I. -O0 -static -march=rv32imac -mabi=ilp32 --specs=nosys.specs
+
+LINKER   = riscv32-unknown-elf-g++
+# linking flags here
+LDFLAGS   = -I. -static 
+LIBS   = $(EXTRA_LIBS)
+
+
+# change these to proper directories where each file should be
+SRCDIR   = ./
+OBJDIR   = .
+BINDIR   = ./
+INCDIR = -I.
+LIBDIR = -L.
+
+
+SOURCES  := $(wildcard $(SRCDIR)/*.cpp)
+INCLUDES := $(wildcard $(INCDIR)/*.h)
+OBJECTS  := $(SOURCES:$(SRCDIR)/%.cpp=$(OBJDIR)/%.o)
+
+rm       = rm -f
+
+
+$(BINDIR)/$(TARGET): $(OBJECTS)
+	$(LINKER) $(CFLAGS) $(LDFLAGS) $(LIBS) $(LIBDIR) $(OBJECTS) -o $@
+	riscv32-unknown-elf-objdump -d $@ > dump
+	riscv32-unknown-elf-objcopy -Oihex $@ $(TARGET).hex
+	@echo "Linking complete!"
+
+$(OBJECTS): $(OBJDIR)/%.o : $(SRCDIR)/%.cpp
+	@echo "Compiling "$<" ..."
+	$(CC) $(CFLAGS) $(INCDIR) -c $< -o $@
+	@echo "Done!"
+
+.PHONY: clean
+clean:
+	@$(rm) $(OBJECTS) *.hex dump
+	@echo "Cleanup complete!"
+
+.PHONY: remove
+remove: clean
+	@$(rm) $(BINDIR)/$(TARGET)
+	@echo "Executable removed!"

tests/CPP/rtti/helper_functions.cpp

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+#include <string.h>
+#include <stdio.h>
+
+
+#define TRACE (*(unsigned char *)0x40000000)
+extern "C" {
+    
+int _read(int file, char* ptr, int len) {
+    return 0;
+}
+
+int _open(int fd) {
+    return 0;
+}
+
+int _close(int fd){
+    return 0;
+}
+
+int _fstat_r(int fd) {
+    return 0;
+}
+
+int _lseek_r(struct _reent *ptr, FILE *fp, long offset, int whence){
+    return 0;
+}
+
+int _isatty_r(struct _reent *ptr, int fd) {
+    return 0;
+}
+
+
+int _write(int file, const char *ptr, int len) {
+  int x;
+
+  for (x = 0; x < len; x++) {
+    TRACE =  *ptr++;
+  }
+
+  return (len);
+}
+
+int _getpid(void) {
+  return 0;
+}
+
+void _kill(int pid) { 
+    return;
+}
+
+}

tests/CPP/rtti/rtti.cpp

@@ -0,0 +1,25 @@
+/* 
+ * RTTI example from https://www.geeksforgeeks.org/g-fact-33/
+ */
+
+#include<iostream> 
+using namespace std; 
+class B { virtual void fun() {} }; 
+class D: public B { }; 
+  
+int main() 
+{ 
+    B *b = new D; 
+    D *d = dynamic_cast<D*>(b); 
+    if(d != NULL) 
+        cout << "works" << endl; 
+    else
+        cout << "cannot cast B* to D*" << endl; 
+
+    
+    asm volatile ("ecall");
+
+    return 0; 
+    
+    
+}