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ability to access pointers with array indexing syntax

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closes #40
This commit is contained in:
Andrew Kelley
2016-01-02 19:47:36 -07:00
parent 968b85ad77
commit 187d00ca83
5 changed files with 113 additions and 105 deletions
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89
src/codegen.cpp
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@@ -199,19 +199,48 @@ static LLVMValueRef gen_fn_call_expr(CodeGen *g, AstNode *node) {
static LLVMValueRef gen_array_ptr(CodeGen *g, AstNode *node) {
assert(node->type == NodeTypeArrayAccessExpr);
// TODO gen_lvalue
LLVMValueRef array_ref_value = gen_expr(g, node->data.array_access_expr.array_ref_expr);
TypeTableEntry *type_entry = get_expr_type(node->data.array_access_expr.array_ref_expr);
AstNode *array_expr_node = node->data.array_access_expr.array_ref_expr;
LLVMValueRef array_ptr = gen_expr(g, array_expr_node);
/*
if (array_expr_node->type == NodeTypeSymbol) {
VariableTableEntry *var = find_variable(array_expr_node->codegen_node->expr_node.block_context,
&array_expr_node->data.symbol);
assert(var);
array_ptr = var->value_ref;
} else if (array_expr_node->type == NodeTypeFieldAccessExpr) {
zig_panic("TODO gen array ptr field access expr");
} else if (array_expr_node->type == NodeTypeArrayAccessExpr) {
zig_panic("TODO gen array ptr array access expr");
} else {
array_ptr = gen_expr(g, array_expr_node);
}
*/
LLVMValueRef subscript_value = gen_expr(g, node->data.array_access_expr.subscript);
assert(array_ref_value);
assert(array_ptr);
assert(subscript_value);
LLVMValueRef indices[] = {
LLVMConstInt(LLVMInt32Type(), 0, false),
subscript_value
};
add_debug_source_node(g, node);
return LLVMBuildInBoundsGEP(g->builder, array_ref_value, indices, 2, "");
if (type_entry->id == TypeTableEntryIdArray) {
LLVMValueRef indices[] = {
LLVMConstNull(g->builtin_types.entry_usize->type_ref),
subscript_value
};
add_debug_source_node(g, node);
return LLVMBuildInBoundsGEP(g->builder, array_ptr, indices, 2, "");
} else if (type_entry->id == TypeTableEntryIdPointer) {
assert(LLVMGetTypeKind(LLVMTypeOf(array_ptr)) == LLVMPointerTypeKind);
LLVMValueRef indices[] = {
subscript_value
};
add_debug_source_node(g, node);
return LLVMBuildInBoundsGEP(g->builder, array_ptr, indices, 1, "");
} else {
zig_unreachable();
}
}
static LLVMValueRef gen_field_ptr(CodeGen *g, AstNode *node, TypeTableEntry **out_type_entry) {
@@ -279,6 +308,14 @@ static LLVMValueRef gen_field_access_expr(CodeGen *g, AstNode *node, bool is_lva
if (buf_eql_str(name, "len")) {
return LLVMConstInt(g->builtin_types.entry_usize->type_ref,
struct_type->data.array.len, false);
} else if (buf_eql_str(name, "ptr")) {
LLVMValueRef array_val = gen_expr(g, node->data.field_access_expr.struct_expr);
LLVMValueRef indices[] = {
LLVMConstNull(g->builtin_types.entry_usize->type_ref),
LLVMConstNull(g->builtin_types.entry_usize->type_ref),
};
add_debug_source_node(g, node);
return LLVMBuildInBoundsGEP(g->builder, array_val, indices, 2, "");
} else {
zig_panic("gen_field_access_expr bad array field");
}
@@ -314,9 +351,15 @@ static LLVMValueRef gen_lvalue(CodeGen *g, AstNode *expr_node, AstNode *node,
target_ref = var->value_ref;
} else if (node->type == NodeTypeArrayAccessExpr) {
TypeTableEntry *array_type = get_expr_type(node->data.array_access_expr.array_ref_expr);
assert(array_type->id == TypeTableEntryIdArray);
*out_type_entry = array_type->data.array.child_type;
target_ref = gen_array_ptr(g, node);
if (array_type->id == TypeTableEntryIdArray) {
*out_type_entry = array_type->data.array.child_type;
target_ref = gen_array_ptr(g, node);
} else if (array_type->id == TypeTableEntryIdPointer) {
*out_type_entry = array_type->data.pointer.child_type;
target_ref = gen_array_ptr(g, node);
} else {
zig_unreachable();
}
} else if (node->type == NodeTypeFieldAccessExpr) {
target_ref = gen_field_ptr(g, node, out_type_entry);
} else {
@@ -389,28 +432,26 @@ static LLVMValueRef gen_bare_cast(CodeGen *g, AstNode *node, LLVMValueRef expr_v
return cast_node->ptr;
}
case CastOpPtrToInt:
add_debug_source_node(g, node);
return LLVMBuildPtrToInt(g->builder, expr_val, wanted_type->type_ref, "");
case CastOpPointerReinterpret:
add_debug_source_node(g, node);
return LLVMBuildBitCast(g->builder, expr_val, wanted_type->type_ref, "");
case CastOpIntWidenOrShorten:
if (actual_type->size_in_bits == wanted_type->size_in_bits) {
return expr_val;
} else if (actual_type->size_in_bits < wanted_type->size_in_bits) {
if (actual_type->data.integral.is_signed && wanted_type->data.integral.is_signed) {
if (actual_type->data.integral.is_signed) {
add_debug_source_node(g, node);
return LLVMBuildSExt(g->builder, expr_val, wanted_type->type_ref, "");
} else if (!actual_type->data.integral.is_signed && !wanted_type->data.integral.is_signed) {
return LLVMBuildZExt(g->builder, expr_val, wanted_type->type_ref, "");
} else {
zig_panic("TODO gen_cast_expr mixing of signness");
add_debug_source_node(g, node);
return LLVMBuildZExt(g->builder, expr_val, wanted_type->type_ref, "");
}
} else {
assert(actual_type->size_in_bits > wanted_type->size_in_bits);
if (actual_type->data.integral.is_signed && wanted_type->data.integral.is_signed) {
return LLVMBuildTrunc(g->builder, expr_val, wanted_type->type_ref, "");
} else {
zig_panic("TODO gen_cast_expr shorten unsigned");
}
add_debug_source_node(g, node);
return LLVMBuildTrunc(g->builder, expr_val, wanted_type->type_ref, "");
}
case CastOpArrayToString:
{
@@ -1232,8 +1273,8 @@ static LLVMValueRef gen_expr_no_cast(CodeGen *g, AstNode *node) {
Buf *str = &node->data.string_literal.buf;
LLVMValueRef str_val = find_or_create_string(g, str, node->data.string_literal.c);
LLVMValueRef indices[] = {
LLVMConstInt(LLVMInt32Type(), 0, false),
LLVMConstInt(LLVMInt32Type(), 0, false)
LLVMConstNull(g->builtin_types.entry_usize->type_ref),
LLVMConstNull(g->builtin_types.entry_usize->type_ref),
};
LLVMValueRef ptr_val = LLVMBuildInBoundsGEP(g->builder, str_val, indices, 2, "");
return ptr_val;