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"""
Parse C expression to access variables and retrieve information:
* Miasm expression to access this variable
* variable type
"""
from miasm2.core.ctypesmngr import CTypeStruct, CAstTypes, CTypePtr
from miasm2.arch.x86.ctype import CTypeAMD64_unk
from miasm2.core.objc import CTypesManagerNotPacked, CHandler
from miasm2.expression.expression import ExprId
"""
C manipulation example
"""
# Digest C information
text = """
struct line {
char color[20];
int size;
};
struct rectangle {
unsigned int width;
unsigned int length;
struct line* line;
};
"""
# Type manager for x86 64: structures not packed
base_types = CTypeAMD64_unk()
types_ast = CAstTypes()
# Add C types definition
types_ast.add_c_decl(text)
types_mngr = CTypesManagerNotPacked(types_ast, base_types)
# Create the ptr variable with type "struct rectangle*"
ptr_rectangle = types_mngr.get_objc(CTypePtr(CTypeStruct('rectangle')))
ptr = ExprId('ptr', 64)
c_context = {ptr.name: ptr_rectangle}
mychandler = CHandler(types_mngr, C_types=c_context)
# Parse some C accesses
c_acceses = ["ptr->width",
"ptr->length",
"ptr->line",
"ptr->line->color",
"ptr->line->color[3]",
"ptr->line->size"
]
for c_str in c_acceses:
expr = mychandler.c_to_expr(c_str)
c_type = mychandler.c_to_type(c_str)
print 'C access:', c_str
print '\tExpr:', expr
print '\tType:', c_type
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