1.1 --- a/src/share/vm/asm/assembler.hpp Fri Dec 23 09:36:23 2011 +0100
1.2 +++ b/src/share/vm/asm/assembler.hpp Fri Dec 23 15:24:36 2011 -0800
1.3 @@ -241,6 +241,33 @@
1.4 // Make it return true on platforms which need to verify
1.5 // instruction boundaries for some operations.
1.6 inline static bool pd_check_instruction_mark();
1.7 +
1.8 + // Add delta to short branch distance to verify that it still fit into imm8.
1.9 + int _short_branch_delta;
1.10 +
1.11 + int short_branch_delta() const { return _short_branch_delta; }
1.12 + void set_short_branch_delta() { _short_branch_delta = 32; }
1.13 + void clear_short_branch_delta() { _short_branch_delta = 0; }
1.14 +
1.15 + class ShortBranchVerifier: public StackObj {
1.16 + private:
1.17 + AbstractAssembler* _assm;
1.18 +
1.19 + public:
1.20 + ShortBranchVerifier(AbstractAssembler* assm) : _assm(assm) {
1.21 + assert(assm->short_branch_delta() == 0, "overlapping instructions");
1.22 + _assm->set_short_branch_delta();
1.23 + }
1.24 + ~ShortBranchVerifier() {
1.25 + _assm->clear_short_branch_delta();
1.26 + }
1.27 + };
1.28 + #else
1.29 + // Dummy in product.
1.30 + class ShortBranchVerifier: public StackObj {
1.31 + public:
1.32 + ShortBranchVerifier(AbstractAssembler* assm) {}
1.33 + };
1.34 #endif
1.35
1.36 // Label functions
