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zig_clang: Fix ZigClangAPValue being underaligned vs clang::APValue.

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Also add a static_assert to catch future alignment mismatches on this type, and
reflect recent layout changes in the Zig bindings.
This commit is contained in:
Alex Rønne Petersen 2025-04-07 20:36:26 +02:00
parent 70437354c0
commit 79a620d617
3 changed files with 14 additions and 10 deletions
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4
src/clang.zig
View File

@ -63,8 +63,8 @@ pub const APValueKind = enum(c_int) {
};
pub const APValue = extern struct {
Kind: APValueKind,
Data: if (builtin.os.tag == .windows and (builtin.abi == .msvc or builtin.abi == .itanium)) [52]u8 else [68]u8,
Kind: APValueKind align(if (builtin.cpu.arch == .x86 and builtin.os.tag != .windows) 4 else 8),
Data: if (builtin.cpu.arch == .x86 and builtin.os.tag != .windows) [44]u8 else [52]u8,
pub const getKind = ZigClangAPValue_getKind;
extern fn ZigClangAPValue_getKind(*const APValue) APValueKind;

1
src/zig_clang.cpp
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@ -2329,6 +2329,7 @@ static_assert((clang::UnaryExprOrTypeTrait)ZigClangUnaryExprOrTypeTrait_Kind::Zi
static_assert((clang::UnaryExprOrTypeTrait)ZigClangUnaryExprOrTypeTrait_Kind::ZigClangUnaryExprOrTypeTrait_KindOpenMPRequiredSimdAlign == clang::UnaryExprOrTypeTrait::UETT_OpenMPRequiredSimdAlign, "");
static_assert(sizeof(ZigClangAPValue) == sizeof(clang::APValue), "");
static_assert(alignof(ZigClangAPValue) == alignof(clang::APValue), "");
static_assert(sizeof(ZigClangSourceLocation) == sizeof(clang::SourceLocation), "");
static ZigClangSourceLocation bitcast(clang::SourceLocation src) {

19
src/zig_clang.h
View File

@ -9,6 +9,7 @@
#define ZIG_ZIG_CLANG_H
#include <inttypes.h>
#include <stdalign.h>
#include <stdbool.h>
#include <stddef.h>
@ -65,16 +66,18 @@ enum ZigClangAPValueKind {
ZigClangAPValueAddrLabelDiff,
};
struct ZigClangAPValue {
#if defined(__i386__) && !defined(_WIN32)
# define ZIG_CLANG_APVALUE_SIZE 44
# define ZIG_CLANG_APVALUE_ALIGN 4
#else
# define ZIG_CLANG_APVALUE_SIZE 52
# define ZIG_CLANG_APVALUE_ALIGN 8
#endif
struct alignas(ZIG_CLANG_APVALUE_ALIGN) ZigClangAPValue {
enum ZigClangAPValueKind Kind;
// experimentally-derived size of clang::APValue::DataType
#if defined(_WIN32) && defined(_MSC_VER)
char Data[52];
#elif defined(__i386__) && !defined(_WIN32)
char Data[44];
#else
char Data[52];
#endif
char Data[ZIG_CLANG_APVALUE_SIZE];
};
struct ZigClangExprEvalResult {