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expr: BitCast for ImplicitCastExpr

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This commit is contained in:
hryx 2019-05-27 14:38:09 -07:00
parent 9c437f9032
commit 3bbee1ba2e
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GPG Key ID: 6A2784E15D7D95D6
4 changed files with 62 additions and 2 deletions
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4
src-self-hosted/clang.zig
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@ -879,4 +879,8 @@ pub const ZigClangVarDecl_TLSKind = extern enum {
Dynamic,
};
pub extern fn ZigClangImplicitCastExpr_getBeginLoc(*const ZigClangImplicitCastExpr) ZigClangSourceLocation;
pub extern fn ZigClangImplicitCastExpr_getCastKind(*const ZigClangImplicitCastExpr) ZigClangCK;
pub extern fn ZigClangImplicitCastExpr_getSubExpr(*const ZigClangImplicitCastExpr) *const ZigClangExpr;
pub extern fn ZigClangArrayType_getElementType(*const ZigClangArrayType) ZigClangQualType;

39
src-self-hosted/translate_c.zig
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@ -107,6 +107,7 @@ const Context = struct {
decl_table: DeclTable,
global_scope: *Scope.Root,
mode: Mode,
clang_context: *ZigClangASTContext,
fn a(c: *Context) *std.mem.Allocator {
return &c.tree.arena_allocator.allocator;
@ -183,6 +184,7 @@ pub fn translate(
.decl_table = DeclTable.init(arena),
.global_scope = try arena.create(Scope.Root),
.mode = mode,
.clang_context = ZigClangASTUnit_getASTContext(ast_unit).?,
};
context.global_scope.* = Scope.Root{
.base = Scope{
@ -458,7 +460,14 @@ fn transImplicitCastExpr(
scope: *Scope,
expr: *const ZigClangImplicitCastExpr,
) !TransResult {
switch (ZigClangImplicitCastExpr_getCastKind(@ptrCast(*const ZigClangImplicitCastExpr, expr))) {
const c = rp.c;
switch (ZigClangImplicitCastExpr_getCastKind(expr)) {
.BitCast => {
const node = try transExpr(rp, scope, @ptrCast(*const ZigClangExpr, expr), .used, .r_value);
const dest_type = getExprQualType(c, @ptrCast(*const ZigClangExpr, expr));
const src_type = getExprQualType(c, ZigClangImplicitCastExpr_getSubExpr(expr));
return try transCCast(rp, scope, ZigClangImplicitCastExpr_getBeginLoc(expr), dest_type, src_type, node.node);
},
else => |kind| return revertAndWarn(
rp,
error.UnsupportedTranslation,
@ -469,6 +478,17 @@ fn transImplicitCastExpr(
}
}
fn transCCast(
rp: RestorePoint,
scope: *Scope,
loc: ZigClangSourceLocation,
dst_type: ZigClangQualType,
src_type: ZigClangQualType,
target_node: *ast.Node,
) !TransResult {
return revertAndWarn(rp, error.UnsupportedTranslation, loc, "TODO implement translation of C cast");
}
fn transExpr(
rp: RestorePoint,
scope: *Scope,
@ -499,6 +519,23 @@ fn qualTypeCanon(qt: ZigClangQualType) *const ZigClangType {
return ZigClangQualType_getTypePtr(canon);
}
fn getExprQualType(c: *Context, expr: *const ZigClangExpr) ZigClangQualType {
blk: {
// If this is a C `char *`, turn it into a `const char *`
if (ZigClangExpr_getStmtClass(expr) != .ImplicitCastExprClass) break :blk;
const cast_expr = @ptrCast(*const ZigClangImplicitCastExpr, expr);
if (ZigClangImplicitCastExpr_getCastKind(cast_expr) != .ArrayToPointerDecay) break :blk;
const sub_expr = ZigClangImplicitCastExpr_getSubExpr(cast_expr);
if (ZigClangExpr_getStmtClass(sub_expr) != .StringLiteralClass) break :blk;
const array_qt = ZigClangExpr_getType(sub_expr);
const array_type = @ptrCast(*const ZigClangArrayType, ZigClangQualType_getTypePtr(array_qt));
var pointee_qt = ZigClangArrayType_getElementType(array_type);
ZigClangQualType_addConst(&pointee_qt);
return ZigClangASTContext_getPointerType(c.clang_context, pointee_qt);
}
return ZigClangExpr_getType(expr);
}
const RestorePoint = struct {
c: *Context,
token_index: ast.TokenIndex,

17
src/zig_clang.cpp
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@ -1920,7 +1920,22 @@ const struct ZigClangStringLiteral *ZigClangPredefinedExpr_getFunctionName(
return reinterpret_cast<const struct ZigClangStringLiteral *>(result);
}
ZigClangSourceLocation ZigClangImplicitCastExpr_getBeginLoc(const struct ZigClangImplicitCastExpr *self) {
auto casted = reinterpret_cast<const clang::ImplicitCastExpr *>(self);
return bitcast(casted->getBeginLoc());
}
enum ZigClangCK ZigClangImplicitCastExpr_getCastKind(const struct ZigClangImplicitCastExpr *self) {
auto casted = reinterpret_cast<const clang::CastExpr *>(self);
auto casted = reinterpret_cast<const clang::ImplicitCastExpr *>(self);
return (ZigClangCK)casted->getCastKind();
}
const struct ZigClangExpr *ZigClangImplicitCastExpr_getSubExpr(const struct ZigClangImplicitCastExpr *self) {
auto casted = reinterpret_cast<const clang::ImplicitCastExpr *>(self);
return reinterpret_cast<const struct ZigClangExpr *>(casted->getSubExpr());
}
struct ZigClangQualType ZigClangArrayType_getElementType(const struct ZigClangArrayType *self) {
auto casted = reinterpret_cast<const clang::ArrayType *>(self);
return bitcast(casted->getElementType());
}

4
src/zig_clang.h
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@ -870,6 +870,10 @@ ZIG_EXTERN_C const char *ZigClangStringLiteral_getString_bytes_begin_size(const
ZIG_EXTERN_C const struct ZigClangStringLiteral *ZigClangPredefinedExpr_getFunctionName(
const struct ZigClangPredefinedExpr *self);
ZIG_EXTERN_C struct ZigClangSourceLocation ZigClangImplicitCastExpr_getBeginLoc(const struct ZigClangImplicitCastExpr *);
ZIG_EXTERN_C enum ZigClangCK ZigClangImplicitCastExpr_getCastKind(const struct ZigClangImplicitCastExpr *);
ZIG_EXTERN_C const struct ZigClangExpr *ZigClangImplicitCastExpr_getSubExpr(const struct ZigClangImplicitCastExpr *);
ZIG_EXTERN_C struct ZigClangQualType ZigClangArrayType_getElementType(const struct ZigClangArrayType *);
#endif