Update V8 to r3431 as required by WebKit r51976.
Change-Id: I567392c3f8c0a0d5201a4249611ac4ccf468cd5b
diff --git a/src/platform-linux.cc b/src/platform-linux.cc
index fe4c31f..bfcd8fb 100644
--- a/src/platform-linux.cc
+++ b/src/platform-linux.cc
@@ -84,11 +84,68 @@
}
-double OS::nan_value() {
- return NAN;
+uint64_t OS::CpuFeaturesImpliedByPlatform() {
+#if (defined(__VFP_FP__) && !defined(__SOFTFP__))
+ // Here gcc is telling us that we are on an ARM and gcc is assuming that we
+ // have VFP3 instructions. If gcc can assume it then so can we.
+ return 1u << VFP3;
+#else
+ return 0; // Linux runs on anything.
+#endif
}
+#ifdef __arm__
+bool OS::ArmCpuHasFeature(CpuFeature feature) {
+ const char* search_string = NULL;
+ const char* file_name = "/proc/cpuinfo";
+ // Simple detection of VFP at runtime for Linux.
+ // It is based on /proc/cpuinfo, which reveals hardware configuration
+ // to user-space applications. According to ARM (mid 2009), no similar
+ // facility is universally available on the ARM architectures,
+ // so it's up to individual OSes to provide such.
+ //
+ // This is written as a straight shot one pass parser
+ // and not using STL string and ifstream because,
+ // on Linux, it's reading from a (non-mmap-able)
+ // character special device.
+ switch (feature) {
+ case VFP3:
+ search_string = "vfp";
+ break;
+ default:
+ UNREACHABLE();
+ }
+
+ FILE* f = NULL;
+ const char* what = search_string;
+
+ if (NULL == (f = fopen(file_name, "r")))
+ return false;
+
+ int k;
+ while (EOF != (k = fgetc(f))) {
+ if (k == *what) {
+ ++what;
+ while ((*what != '\0') && (*what == fgetc(f))) {
+ ++what;
+ }
+ if (*what == '\0') {
+ fclose(f);
+ return true;
+ } else {
+ what = search_string;
+ }
+ }
+ }
+ fclose(f);
+
+ // Did not find string in the proc file.
+ return false;
+}
+#endif // def __arm__
+
+
int OS::ActivationFrameAlignment() {
#ifdef V8_TARGET_ARCH_ARM
// On EABI ARM targets this is required for fp correctness in the
@@ -232,7 +289,7 @@
// This function assumes that the layout of the file is as follows:
// hex_start_addr-hex_end_addr rwxp <unused data> [binary_file_name]
// If we encounter an unexpected situation we abort scanning further entries.
- FILE *fp = fopen("/proc/self/maps", "r");
+ FILE* fp = fopen("/proc/self/maps", "r");
if (fp == NULL) return;
// Allocate enough room to be able to store a full file name.
@@ -603,7 +660,7 @@
typedef struct sigcontext mcontext_t;
typedef struct ucontext {
uint32_t uc_flags;
- struct ucontext *uc_link;
+ struct ucontext* uc_link;
stack_t uc_stack;
mcontext_t uc_mcontext;
__sigset_t uc_sigmask;