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Bug 846670 - Initialize stackBase and stackSize properly for the main-thread when using bionic. r=billm

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This commit is contained in:
Dave Hylands 2013-03-13 16:31:15 -07:00
parent 8371c0fba6
commit d7ab25ed14
1 changed files with 37 additions and 6 deletions
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43
js/src/jsnativestack.cpp
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@ -23,6 +23,11 @@
# include <pthread_np.h>
# endif
# if defined(ANDROID)
# include <unistd.h>
# include <sys/types.h>
# endif
#else
# error "Unsupported platform"
@ -125,17 +130,43 @@ js::GetNativeStackBaseImpl()
void *stackBase = 0;
size_t stackSize = 0;
# ifdef DEBUG
int rc =
# endif
int rc;
# if defined(__OpenBSD__)
pthread_stackseg_np(pthread_self(), &ss);
rc = pthread_stackseg_np(pthread_self(), &ss);
stackBase = (void*)((size_t) ss.ss_sp - ss.ss_size);
stackSize = ss.ss_size;
# elif defined(ANDROID)
if (gettid() == getpid()) {
// bionic's pthread_attr_getstack doesn't tell the truth for the main
// thread (see bug 846670). So we scan /proc/self/maps to find the
// segment which contains the stack.
rc = -1;
FILE *fs = fopen("/proc/self/maps", "r");
if (fs) {
char line[100];
unsigned long stackAddr = (unsigned long)&sattr;
while (fgets(line, sizeof(line), fs) != NULL) {
unsigned long stackStart;
unsigned long stackEnd;
if (sscanf(line, "%lx-%lx ", &stackStart, &stackEnd) == 2 &&
stackAddr >= stackStart && stackAddr < stackEnd) {
stackBase = (void *)stackStart;
stackSize = stackEnd - stackStart;
rc = 0;
break;
}
}
fclose(fs);
}
} else
// For non main-threads pthread allocates the stack itself so it tells
// the truth.
rc = pthread_attr_getstack(&sattr, &stackBase, &stackSize);
# else
pthread_attr_getstack(&sattr, &stackBase, &stackSize);
rc = pthread_attr_getstack(&sattr, &stackBase, &stackSize);
# endif
JS_ASSERT(!rc);
if (rc)
MOZ_CRASH();
JS_ASSERT(stackBase);
pthread_attr_destroy(&sattr);