Version 3.3.3
Added support for generating Visual Studio solution and project files using GYP.
Implemented support for ARM EABI calling convention variation where floating-point arguments are passed in registers (hardfloat).
Added Object::HasOwnProperty() to the API.
Added support for compressing startup data to reduce binary size. This includes build time support and an API for the embedder to decompress the startup data before initializing V8.
Reduced the profiling hooks overhead from >400% to 25% when using ll_prof.
Performance improvements and bug fixes on all platforms.
git-svn-id: http://v8.googlecode.com/svn/trunk@7749 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
diff --git a/src/platform-linux.cc b/src/platform-linux.cc
index 1ecd8fc..db6c80ed 100644
--- a/src/platform-linux.cc
+++ b/src/platform-linux.cc
@@ -1,4 +1,4 @@
-// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
@@ -87,6 +87,25 @@
uint64_t seed = static_cast<uint64_t>(TimeCurrentMillis());
srandom(static_cast<unsigned int>(seed));
limit_mutex = CreateMutex();
+
+#ifdef __arm__
+ // When running on ARM hardware check that the EABI used by V8 and
+ // by the C code is the same.
+ bool hard_float = OS::ArmUsingHardFloat();
+ if (hard_float) {
+#if !USE_EABI_HARDFLOAT
+ PrintF("ERROR: Binary compiled with -mfloat-abi=hard but without "
+ "-DUSE_EABI_HARDFLOAT\n");
+ exit(1);
+#endif
+ } else {
+#if USE_EABI_HARDFLOAT
+ PrintF("ERROR: Binary not compiled with -mfloat-abi=hard but with "
+ "-DUSE_EABI_HARDFLOAT\n");
+ exit(1);
+#endif
+ }
+#endif
}
@@ -142,6 +161,7 @@
return false;
}
+
bool OS::ArmCpuHasFeature(CpuFeature feature) {
const char* search_string = NULL;
// Simple detection of VFP at runtime for Linux.
@@ -177,6 +197,50 @@
return false;
}
+
+
+// Simple helper function to detect whether the C code is compiled with
+// option -mfloat-abi=hard. The register d0 is loaded with 1.0 and the register
+// pair r0, r1 is loaded with 0.0. If -mfloat-abi=hard is pased to GCC then
+// calling this will return 1.0 and otherwise 0.0.
+static void ArmUsingHardFloatHelper() {
+ asm("mov r0, #0");
+#if defined(__VFP_FP__) && !defined(__SOFTFP__)
+ // Load 0x3ff00000 into r1 using instructions available in both ARM
+ // and Thumb mode.
+ asm("mov r1, #3");
+ asm("mov r2, #255");
+ asm("lsl r1, r1, #8");
+ asm("orr r1, r1, r2");
+ asm("lsl r1, r1, #16");
+ // For vmov d0, r0, r1 use ARM mode.
+#ifdef __thumb__
+ asm volatile(
+ "@ Enter ARM Mode \n\t"
+ " adr r3, 1f \n\t"
+ " bx r3 \n\t"
+ " .ALIGN 4 \n\t"
+ " .ARM \n"
+ "1: vmov d0, r0, r1 \n\t"
+ "@ Enter THUMB Mode\n\t"
+ " adr r3, 2f+1 \n\t"
+ " bx r3 \n\t"
+ " .THUMB \n"
+ "2: \n\t");
+#else
+ asm("vmov d0, r0, r1");
+#endif // __thumb__
+#endif // defined(__VFP_FP__) && !defined(__SOFTFP__)
+ asm("mov r1, #0");
+}
+
+
+bool OS::ArmUsingHardFloat() {
+ // Cast helper function from returning void to returning double.
+ typedef double (*F)();
+ F f = FUNCTION_CAST<F>(FUNCTION_ADDR(ArmUsingHardFloatHelper));
+ return f() == 1.0;
+}
#endif // def __arm__