https://bugs.llvm.org/show_bug.cgi?id=36576
Bug ID: 36576
Summary: clang_Cursor_Evaluate does not support aggregate or
complex initializers
Product: clang
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: libclang
Assignee: unassignedclangb...@nondot.org
Reporter: matti.niemenmaa+llvmb...@iki.fi
CC: kli...@google.com, llvm-bugs@lists.llvm.org
At the time of writing (2018-03-02, SVN r326551) clang_Cursor_Evaluate only
supports integers, doubles, and strings, as is evident from the structure it
returns:
struct ExprEvalResult {
CXEvalResultKind EvalType;
union {
unsigned long long unsignedVal;
long long intVal;
double floatVal;
char *stringVal;
} EvalData;
bool IsUnsignedInt;
// destructor omitted
}
This means that attempting to examine the values of e.g. any of the following
constants results in a null pointer instead of any useful information:
const int array[] = {1, 2, 3};
const struct { int x, y; } structure = { .x = 1, .y = 2 };
const union { int x, y; } my_union = { .y = 3 };
#include <complex.h>
const float complex complex_float = 1 + 2*I;
As far as I can tell there is no way of discovering those values using
libclang. One user that would benefit from this information is Rust's binding
generation tool, bindgen:
https://github.com/rust-lang-nursery/rust-bindgen/issues/1266
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