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8004128: NPG: remove stackwalking in Threads::gc_prologue and gc_epilogue code

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Remove bcx and mdx handling.  We no longer have to convert bytecode pointers to indices for GC since Methods aren't moved.

Reviewed-by: mgerdin, kvn
This commit is contained in:
Coleen Phillimore 2014-07-17 15:45:46 -04:00
parent 79eab12bba
commit 3f0a945468
40 changed files with 132 additions and 336 deletions
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22
hotspot/src/share/vm/oops/method.cpp
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@ -240,6 +240,9 @@ void Method::mask_for(int bci, InterpreterOopMap* mask) {
int Method::bci_from(address bcp) const {
if (is_native() && bcp == 0) {
return 0;
}
#ifdef ASSERT
{ ResourceMark rm;
assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
@ -250,24 +253,23 @@ int Method::bci_from(address bcp) const {
}
// Return (int)bcx if it appears to be a valid BCI.
// Return bci_from((address)bcx) if it appears to be a valid BCP.
int Method::validate_bci(int bci) const {
return (bci == 0 || bci < code_size()) ? bci : -1;
}
// Return bci if it appears to be a valid bcp
// Return -1 otherwise.
// Used by profiling code, when invalid data is a possibility.
// The caller is responsible for validating the Method* itself.
int Method::validate_bci_from_bcx(intptr_t bcx) const {
int Method::validate_bci_from_bcp(address bcp) const {
// keep bci as -1 if not a valid bci
int bci = -1;
if (bcx == 0 || (address)bcx == code_base()) {
if (bcp == 0 || bcp == code_base()) {
// code_size() may return 0 and we allow 0 here
// the method may be native
bci = 0;
} else if (frame::is_bci(bcx)) {
if (bcx < code_size()) {
bci = (int)bcx;
}
} else if (contains((address)bcx)) {
bci = (address)bcx - code_base();
} else if (contains(bcp)) {
bci = bcp - code_base();
}
// Assert that if we have dodged any asserts, bci is negative.
assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");