scc

simple c99 compiler
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commit ffdf276b7cc0f7e8fabc6217e13a880768add28b
parent 42eaab3f622a05d33a00df47774bc46377465744
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Thu, 15 Sep 2016 16:49:35 +0200

[cc2-qbe] Implement the . operator

Diffstat:
Mcc2/arch/qbe/cgen.c | 34++++++++++++++++++++++++++++++++--
1 file changed, 32 insertions(+), 2 deletions(-)

diff --git a/cc2/arch/qbe/cgen.c b/cc2/arch/qbe/cgen.c @@ -90,7 +90,7 @@ static char opasmd[] = { [OCPL] = ASCPLD }; -extern Type int32type, uint32type; +extern Type int32type, uint32type, ptrtype; static Node * tmpnode(Node *np, Type *tp) @@ -127,7 +127,8 @@ load(Type *tp, Node *np, Node *new) op = (tp->flags & INTF) ? ASLDL : ASLDD; break; default: - abort(); + *new = *np; + return new; } code(op, tmpnode(new, tp), np, NULL); @@ -278,6 +279,32 @@ assign(Type *tp, Node *to, Node *from) return from; } +/* TODO: Do field() transformation in sethi */ + +static Node * +field(Node *np, Node *ret, int islhs) +{ + Node base, node, off, add, *addr; + TUINT offset = np->right->u.sym->u.off; + + addr = rhs(np->left, &base); + + if (offset != 0) { + node.op = OADD; + node.type = ptrtype; + node.left = addr; + node.right = constnode(&off, offset, &ptrtype); + addr = rhs(&node, &add); + } + + if (islhs) + *ret = *addr; + else + load(&np->type, addr, ret); + + return ret; +} + static Node * lhs(Node *np, Node *new) { @@ -288,6 +315,8 @@ lhs(Node *np, Node *new) return np; case OPTR: return rhs(np->left, new); + case OFIELD: + return field(np, new, 1); default: abort(); } @@ -508,6 +537,7 @@ rhs(Node *np, Node *ret) case OADDR: return lhs(l, ret); case OFIELD: + return field(np, ret, 0); case OCASE: case ODEFAULT: case OESWITCH: